US2488710A - Enclosing shield for electrical applications - Google Patents
Enclosing shield for electrical applications Download PDFInfo
- Publication number
- US2488710A US2488710A US698716A US69871646A US2488710A US 2488710 A US2488710 A US 2488710A US 698716 A US698716 A US 698716A US 69871646 A US69871646 A US 69871646A US 2488710 A US2488710 A US 2488710A
- Authority
- US
- United States
- Prior art keywords
- members
- portions
- shield
- end wall
- pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- -1 copper and aluminum Chemical class 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- SYOKIDBDQMKNDQ-XWTIBIIYSA-N vildagliptin Chemical compound C1C(O)(C2)CC(C3)CC1CC32NCC(=O)N1CCC[C@H]1C#N SYOKIDBDQMKNDQ-XWTIBIIYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0049—Casings being metallic containers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S220/00—Receptacles
- Y10S220/25—U-shaped sectional
Definitions
- This invention pertains to enclosing shields for electrical apparatus, and more particularly to shields suitable for preventing undesirable coupling in audio and radio frequency circuits.
- baille shields are employed to prevent capacitative coupling between two circuits, but enclosing shields have been found to be more practical and efiective in radio and audio frequency applications to prevent magnetic coupling between transformers, chokes, coils, etc., of radio and other electrical apparatus. Also, in high gain amplifiers, shields are employed to prevent feedback by magnetic or electric fields from the high level to the sensitive low level stages.
- Shields of rectangular shape are difiicult and expensive to fabricate with drawing dies, since they require several draws with costly tools, intermediate strain-relieving anneals, and involve a rather high labor charge.
- One set of tools will produce only one shield size. Different types of tools also will be required for difierent metals.
- My present invention pertains to a new and improved form of shield that can be inexpensively fabricated into various sizes and shapes and that can be made from various types of materials by utilizing simple tools, that can be a8- 2 Sild in a highly effective manner and to provide a positive connection to the ground without welding, and that will withstand shock and vibration, such as encountered in installations of electrical apparatus in motor vehicles, etc.
- Another object has been to provide a shield that can be inexpensively fabricated from any suitable type Of material and into any desired shape.
- a further object has been to devise a shield construction that may be assembled and mounted in a permanent relationship about an electrical device, but that at the same time can be readily disassembled, for example, when the electrical device has worn out and it is to be replaced or repaired.
- a still further object has been to provide a shield made up of parts that will closely interfit and can be manually mounted in an assembled relationship.
- Figure 1 is a top plan view of a substantially fiat piece of material cut to provide a part of the shield of the exemplary form of my invention; it also illustrates how the piece may be formed or bent to its desired shape;
- Figure 2 is a view similar to Figure l, but showing a second part of the shield of the exemplary form Of my invention
- Figure 3 is a side perspective view of the pieces of Figures 1 and 2 after they have been shaped or formed; it is also, in effect, an exploded view of the two parts showing their relationship before assembly;
- Figure 4 is a side perspective view of the two parts in a partially assembled relationship
- Figure 5 is a side perspective view showing the two parts in a completely assembled relationship of rectangular shape
- Figure 6 is a vertical section line VIVI of Figure 5.
- Figure '7 is a horizontal section taken along the line VII-VII of Figure 5.
- a shield that comprises interfi-tting parts that are in effect locked in position with respect to taken along the each other in such a manner that they will not come apart during usage even where the electrical device or the apparatus of which it is a part is subjected to a certain amount of vibration or shock.
- the parts can be patterned out of flat stock, for example, strip or sheet metal, and cut into blanks. The blanks then may be notched on adjustable tools and formed or bent to the required shape, for example on a bending brake.
- dies can be used if standard shapes or sizes are being made in volume, although I prefer to utilize a simple procedure such as above outlined, in order to utilize different materials and sizes for difierent applications with a minimum of change-over and expense.
- the exemplary embodiment of my invention comprises two parts which may be manually assembled by pushing them together in a complementary manner.
- Each of these parts have somewhat flexible portions, wedge flanges or tabs which guide the assembly and in effect hold the parts in a locked assembled relationship. That is, the two parts can be slid into position against the tension of the particular material utilized.
- I provide what may be termed an eight-point gripping contact between edge flanges or tabs of the two parts and that the positioning relationship of the tabs is such that they interfit and support adjacent portions of the two parts, both externally and internally of the assembled shape. This prevents them from being distorted out of shape when assembled and provides a maximum interfltting contact consistent with the simple construction involved.
- Such a type of shield may be made of magnetic steel or iron having suitable tensile strength for an audio frequency utilization and of more conductive materials, such as copper, aluminum, brass, etc., for a radio frequency application. It may be employed to shield coils, chokes, input, output transformers, tubes, and other electrical devices as desired. Although I preferably utilize suitable metallic materials in making such shields, it will be apparent that meta1-coated plastics, glasses, etc., may also be used, provided the material has the necessary strength and flexibility.
- the shield is made up of two parts or members Hi and 26 which are constrcted and arranged in such a manner that their side body or wall portions interfit and provide iour side walls of the rectangular shape. It will also be noted that each part or member is provided with flanges which, in eiiect, as shown particularly in Figure 5, having an intersupporting relationship for the side body portions of the other part or member.
- FIG 1 I have shown a flat piece of material such as a strip or sheet, out of which a pattern corresponding to the desired outline of one part of the shield is to be provided. This piece is cut to provide tabs or longitudinally extending wall portions l2 and extending flange portions I! which are integral with an end portion or, in the layout, a central portion l9. Suitable holes l3 may be drilled or punched out for the electrical leads of the device to be enclosed.
- the dotted lines a and b indicate how the portions H and 12 ma be bent upwardly to provide a shape, such as shown in Figure 3.
- Figure 2 is a layout similar to Figure l, but represents a pattern for a second member or part of the assembly of Figure 5 and comprises a central body or end wall portion 23, side wall portions 22 and bent over or flange portions 2: and 24.
- a hole or a number of holes, such as 23, may be drilled or stamped out or the flat piece to provide a mounting for the shield.
- the dotted lines 0 and d indicate how the portions of the piece may be bent or formed to provide the ultimate shape shown in Figure 3.
- the portions 2! have a spacedapart, cut-out relationship with respect to the portions 24, in order to permit them to be bent up as shown in Figure 3, without interl'ering with longitudinally-extending side wall flanges 24 or the side wall portions 22.
- the shield In making the parts or members of the shield, I preier to use some suitable material that has properties of flexibility and sufficient tensile strength to support the holding action of the two members when in an assembled relationship.
- the first part or member it will be noted that it comprises a central or end body portion Ill, a pair of spaced-apart side tab body or wall portions l2, and extending, spaced-- apart, offset side flange portions ll.
- the flanges II are transversely offset with respect to side edges of adjacent side wall portions or tabs l2.
- the tabs l2 will preferably have a length substantially corresponding to the desired ultimate length of th assembly and will prelerably be formed so that they have a slope with respec to the longitudinal plane of the wall portions its and normally extending slightly outwardly or away from the central or end wall portion ill.
- the offset flange portions l I extend slightly outwardly to provide a wedge or interpoking surface for extending side body portions of the sec- 0nd member or part 20.
- the second member comprises a central or end body portion 28, a pair of spaced-apart side wall or body portions 22 extending longitudinally therefrom and at right angles to the portion 2i, and a pair of spaced-apart offset side edge flanges .;.l which are preferably transversely offset with respect to side edges of the side wall portions 22 in the sense that they are inclined sli htly inwardly to wedgingly engage the transverse ends of the side body portions H of the firs-tenantioned part.
- the side body portions preferably have a longitudinal extent substantially equa to that oi the assembly and are provided witli inwardly-projecting ofiset side flanges extending substantially at right angles thereto.
- Figures 4 and 5 show how the two substantially U-shaped parts or enclosure members may be assembled. That is, one hand of the operator may hold and compress the tabs oi the first member while the other hand of the operator may grip the second member adjacent its side body portions 22 to slightly compress them inwardy until the two parts are slidably entered with respect to each other. It will be apparent that the side tab portions l2 of the first member fit inside the longitudinal flanges 24 of the second member and that the wall portions l2 and 22 of both members form a complete side wall enclosure.
- the flanges ll of the first part fit over transverse ends of the side body portions 22 of the second member, while the flanges 2
- exert an outwardly wedging, looking, or holding force on the portions l2
- the outer flanges ll exert an inwardly wedging, looking or holding force upon the side body portions 22 of the second part.
- the side flanges 24 support the side portions l2 of the first member against outward distortion and the flanges 2
- each of the members in and 20 has three sides, and when assembled in a complementary relation, provide a six-sided complete enclosure.
- a shield box for electrical apparatus comprising, a pair of interfitting members, said members being constructed of flexible tensile metal having suitable electrical characteristics, each of said members having a shaped end wall portion, the end wall portion of one of said members having a pair of spaced-apart longitudinal tabs extending substantially at right angles and inclining outwardly with respect to their associated end wall porton, the second of said members having a pair of spaced-apart longitudinal side portions extending substantially at right angles to their end portion and having turned-over longitudinal edge portions constructed and arranged to slide over and inwardly flex the longitudinal tabs of said first member to provide a four-sided enclosing wall.
- a shield box for electrical apparatus comprising, a pair of interfitting members of suitable flexible material having desired electrical characteristics, each of said members having an end wall and a pair of spaced-apart side walls extending longitudinally and integrally from opposite side edges of its associated end wall, said side walls being constructed and arranged to slideably and flexibly interfit with respect to side walls of the other of said members, each of said members having bent-over edge portions adapted 6 to slideably receive and lockingly abut extending portions of side walls of the other of said members and to support said side walls against inward and outward distortion when said members are in an assembled relationship, the bent-over portions being shaped to provide wedging engagement of increasing force as said members are moved endwise into a fully assembled relationship.
- a rectangular shield box for electrical apparatus which comprises, a pair of interfitting members of flexible metal construction having suitable electrical characteristics, each of said members having an end wall portion and a pair of spaced-apart side wall portions extending longitudinally therefrom, the pair of side wall portions of one of said members being sloped slightly outwardly with respect to their associated end Wall portion; the other of said members having spaced-apart side wall portions provided with longitudinally-extending side edge flanges constructed and arranged to receive and slide over and flexibly compress inwardly the pair of side wall portions of the above-mentioned one of said members to provide a four-sided enclosingwall therewith; each of said members having a pair of oppositely-positioned and spaced-apart 'side flanges extending from opposite edges of its end wall portion and transversely between and spaced from adjacent side edges of its pair of side wall portions; transverse edges of the side flanges of the end wall portion of each of said members having an offset spacing with respect to adjacent side edges of its associated pair of side wall portions
- a shield box assembly for parts of an electrical apparatus which comprises, a pair of substantially U-shaped enclosure members, each of said members having a transverse end wall portion and a pair of side wall portions extending longitudinally and in a spaced-apart relation from opposite transverse sides of said end wall portion, the end wall portion of each member of said pair having a pair of side flanges extending longitudinally and in a spaced-apart relation from opposite transverse sides thereof and located between the side wall portions of the same member, each side flange of the end wall portion of each of said members having a transversely-offset relation with respect to side edges of adjacent side wall portions of the same member, and opposite side edges of each side flange of the end wall portion of each of said members having a spaced-apart relation with the side edges of adjacent side wall portions of the same member suflicient to slideably pass a side wall portion of the other member there between; each side edge of each side wall portion of each of said members being constructed and arranged to lie adjacent to a side edge of a side wall
- a shield box assembly for parts of an electrical apparatus and having opposite end walls and an enclosing side wall extending longitudinally between the end walls which comprises, a pair of substantially U-shaped enclosure members, each of said pair of members having a transverse end wall portion and a pair of side wall portions extending longitudinally and in a spaced-apart relation integrally from opposite transverse sides of said end wall portion, the end Wall portion of each member of said pair having a pair of side flanges extending longitudinally and in a spacedapart relation integrally from opposite transverse sides thereof and located between the side wall portions of the same member, each side flange of the end wall portion of each of said members having a transversely-offset relation with respect to side edges of adjacent side wall portions of the same member, and opposite side edges of each side flange 0f the end wall portion of each of said members having a spaced-apart relation with the side edges of adjacent side wall portions of the same member sufiicient to slideably pass a side wall portion of the other member therebetween; each
- a shield box for electrical apparatus comprising, a pair of interfitting members of suitable flexible material having desired electrical characteristics, each of said members having an end wall and a pair of spaced-apart side walls extending longitudinally and integrally from opposite side edges of its associated end wall, said side walls of one of said members having turnedover longitudinal edge portions constructed and arranged to slidably and flexibly interfit with respect to side walls of the other of said members, at least one of said members having bent-over edge portions adapted to slidably receive and lockingly abut extending portions of side walls of the other of said members and to support said walls against inward and outward distortion when said members are in an assembled relationship, the bent-over portions being shaped to provide wedging engagement of increasing force as said members are moved endwise into a fully assembled relationship.
Description
Nov. 22, 1949 .1. H. COOPER ENCLOSING SHIELD FOR ELECTRICAL APPLICATIONS Filed Sept. 23, 1946 INVENTOR aw Patented Nov. 22, 1949 ENCLOSING SHIELD FOR ELECTRICAL APPLICATIONS John H. Cooper, Cheswick, Pa., assignor to Allegheny Ludlum Steel Corporation, a corporation of Pennsylvania Application September 23, 1946, Serial No. 698,716
Claims. 1
This invention pertains to enclosing shields for electrical apparatus, and more particularly to shields suitable for preventing undesirable coupling in audio and radio frequency circuits.
As a general rule, baille shields are employed to prevent capacitative coupling between two circuits, but enclosing shields have been found to be more practical and efiective in radio and audio frequency applications to prevent magnetic coupling between transformers, chokes, coils, etc., of radio and other electrical apparatus. Also, in high gain amplifiers, shields are employed to prevent feedback by magnetic or electric fields from the high level to the sensitive low level stages.
Various sizes of shields are needed, since the size Of electrical devices to be enclosed varies, and also since in radio frequency applications, the effect of the shielding on a coil Q (where Q is the quality factor of a circuit andequals the reactance divided by the resistance of a coil) and inductance becomes less as the distance between the coil and the shield is increased. More conductive metals, such as copper and aluminum, are generally employed to decrease losses in radio frequency applications, while magnetic materials preferably of high permeability to provide a low reluctance path for the external flux, such as magnetic steels and irons, are better for audio frequency applications.
It will thus appear that the method or methods of making shields should be adaptable to various sizes and to the utilization of various types of metals and materials.
Previous to the present invention, various types of shields have been employed in electrical installations, but particular difficulty has been encountered in the manufacture of shields of a general rectangular shape.
Shields of rectangular shape are difiicult and expensive to fabricate with drawing dies, since they require several draws with costly tools, intermediate strain-relieving anneals, and involve a rather high labor charge. One set of tools will produce only one shield size. Different types of tools also will be required for difierent metals.
As a result, the trade has resorted, to some extent, to the use of built up products from flat stock that is cut, shaped, and welded together. However, such assembly requires special design features to permit the welding to be eflected.
My present invention pertains to a new and improved form of shield that can be inexpensively fabricated into various sizes and shapes and that can be made from various types of materials by utilizing simple tools, that can be a8- 2 sembled in a highly effective manner and to provide a positive connection to the ground without welding, and that will withstand shock and vibration, such as encountered in installations of electrical apparatus in motor vehicles, etc.
And, it has been an object of my invention to provide a new and improved form of shield.
Another object has been to provide a shield that can be inexpensively fabricated from any suitable type Of material and into any desired shape.
Another object'has been to devise a shield that may be simply and positively assembled without welding or other securing means.
A further object has been to devise a shield construction that may be assembled and mounted in a permanent relationship about an electrical device, but that at the same time can be readily disassembled, for example, when the electrical device has worn out and it is to be replaced or repaired.
A still further object has been to provide a shield made up of parts that will closely interfit and can be manually mounted in an assembled relationship.
These and many other objects of my invention will appear to those skilled in the art from the description and exemplary embodiment thereof and from the appended claims.
In the drawings:
Figure 1 is a top plan view of a substantially fiat piece of material cut to provide a part of the shield of the exemplary form of my invention; it also illustrates how the piece may be formed or bent to its desired shape;
Figure 2 is a view similar to Figure l, but showing a second part of the shield of the exemplary form Of my invention;
Figure 3 is a side perspective view of the pieces of Figures 1 and 2 after they have been shaped or formed; it is also, in effect, an exploded view of the two parts showing their relationship before assembly;
Figure 4 is a side perspective view of the two parts in a partially assembled relationship;
Figure 5 is a side perspective view showing the two parts in a completely assembled relationship of rectangular shape;
Figure 6 is a vertical section line VIVI of Figure 5; and,
Figure '7 is a horizontal section taken along the line VII-VII of Figure 5.
In carrying out my invention I have provided a shield that comprises interfi-tting parts that are in effect locked in position with respect to taken along the each other in such a manner that they will not come apart during usage even where the electrical device or the apparatus of which it is a part is subjected to a certain amount of vibration or shock. The parts can be patterned out of flat stock, for example, strip or sheet metal, and cut into blanks. The blanks then may be notched on adjustable tools and formed or bent to the required shape, for example on a bending brake. Of course, it will be appreciated that dies can be used if standard shapes or sizes are being made in volume, although I prefer to utilize a simple procedure such as above outlined, in order to utilize different materials and sizes for difierent applications with a minimum of change-over and expense.
The exemplary embodiment of my invention comprises two parts which may be manually assembled by pushing them together in a complementary manner. Each of these parts have somewhat flexible portions, wedge flanges or tabs which guide the assembly and in effect hold the parts in a locked assembled relationship. That is, the two parts can be slid into position against the tension of the particular material utilized. It will be noted that I provide what may be termed an eight-point gripping contact between edge flanges or tabs of the two parts and that the positioning relationship of the tabs is such that they interfit and support adjacent portions of the two parts, both externally and internally of the assembled shape. This prevents them from being distorted out of shape when assembled and provides a maximum interfltting contact consistent with the simple construction involved.
Although the rectangular form of shield assembly has been shown in the drawings to exemplify my invention, it will be apparent to those skilled in the art that the principles of the invention may be applied to other suitable shapes, such as a cylinder, etc., having a rounded outline.
I have found that a shield constructed in accordance with my invention requires no special tools, can be made in various sizes without extra tools and, when assembled, is more rigid than a welded construction. It will also make possible a good ground connection.
Such a type of shield may be made of magnetic steel or iron having suitable tensile strength for an audio frequency utilization and of more conductive materials, such as copper, aluminum, brass, etc., for a radio frequency application. It may be employed to shield coils, chokes, input, output transformers, tubes, and other electrical devices as desired. Although I preferably utilize suitable metallic materials in making such shields, it will be apparent that meta1-coated plastics, glasses, etc., may also be used, provided the material has the necessary strength and flexibility.
In the xemplary form of my invention shown in the drawings, the shield is made up of two parts or members Hi and 26 which are constrcted and arranged in such a manner that their side body or wall portions interfit and provide iour side walls of the rectangular shape. It will also be noted that each part or member is provided with flanges which, in eiiect, as shown particularly in Figure 5, having an intersupporting relationship for the side body portions of the other part or member.
In Figure 1, I have shown a flat piece of material such as a strip or sheet, out of which a pattern corresponding to the desired outline of one part of the shield is to be provided. This piece is cut to provide tabs or longitudinally extending wall portions l2 and extending flange portions I! which are integral with an end portion or, in the layout, a central portion l9. Suitable holes l3 may be drilled or punched out for the electrical leads of the device to be enclosed. The dotted lines a and b indicate how the portions H and 12 ma be bent upwardly to provide a shape, such as shown in Figure 3.
Figure 2 is a layout similar to Figure l, but represents a pattern for a second member or part of the assembly of Figure 5 and comprises a central body or end wall portion 23, side wall portions 22 and bent over or flange portions 2: and 24. A hole or a number of holes, such as 23, may be drilled or stamped out or the flat piece to provide a mounting for the shield. The dotted lines 0 and d indicate how the portions of the piece may be bent or formed to provide the ultimate shape shown in Figure 3. It will be noted that the portions 2! have a spacedapart, cut-out relationship with respect to the portions 24, in order to permit them to be bent up as shown in Figure 3, without interl'ering with longitudinally-extending side wall flanges 24 or the side wall portions 22.
In making the parts or members of the shield, I preier to use some suitable material that has properties of flexibility and sufficient tensile strength to support the holding action of the two members when in an assembled relationship. Referring particularly to the first part or member, it will be noted that it comprises a central or end body portion Ill, a pair of spaced-apart side tab body or wall portions l2, and extending, spaced-- apart, offset side flange portions ll. As noted, the flanges II are transversely offset with respect to side edges of adjacent side wall portions or tabs l2. The tabs l2 will preferably have a length substantially corresponding to the desired ultimate length of th assembly and will prelerably be formed so that they have a slope with respec to the longitudinal plane of the wall portions its and normally extending slightly outwardly or away from the central or end wall portion ill. The offset flange portions l I extend slightly outwardly to provide a wedge or interpoking surface for extending side body portions of the sec- 0nd member or part 20.
The second member comprises a central or end body portion 28, a pair of spaced-apart side wall or body portions 22 extending longitudinally therefrom and at right angles to the portion 2i, and a pair of spaced-apart offset side edge flanges .;.l which are preferably transversely offset with respect to side edges of the side wall portions 22 in the sense that they are inclined sli htly inwardly to wedgingly engage the transverse ends of the side body portions H of the firs-tenantioned part. The side body portions preferably have a longitudinal extent substantially equa to that oi the assembly and are provided witli inwardly-projecting ofiset side flanges extending substantially at right angles thereto.
Figures 4 and 5 show how the two substantially U-shaped parts or enclosure members may be assembled. That is, one hand of the operator may hold and compress the tabs oi the first member while the other hand of the operator may grip the second member adjacent its side body portions 22 to slightly compress them inwardy until the two parts are slidably entered with respect to each other. It will be apparent that the side tab portions l2 of the first member fit inside the longitudinal flanges 24 of the second member and that the wall portions l2 and 22 of both members form a complete side wall enclosure.
It will also be apparent that the flanges ll of the first part fit over transverse ends of the side body portions 22 of the second member, while the flanges 2| of the second member flt under the transverse ends of the side body wall portions [2 of the first member. In this manner the side walls of both parts or members are supported against distortion either inwardly or outwardly of the assembled shape. The inner flanges 2| exert an outwardly wedging, looking, or holding force on the portions l2, while the outer flanges ll exert an inwardly wedging, looking or holding force upon the side body portions 22 of the second part. The side flanges 24 support the side portions l2 of the first member against outward distortion and the flanges 2| support them against inward distortion when the two members are in an assembled relationship. It will also be noted that the flanges i9 support the side portions 22 of the second member against outward distortion and side edges of tabs l2 support them against inward distortion.
Although the members of the assembled shield are wedgingly engaged in a tightly locked and interfitting relationship in the illustrated embodiment of my invention, it will be apparent that a spot weld may be used to secure the two parts if desired, although one of the advantages of the present arrangement is that welding is not necessary.
It will appear that each of the members in and 20 has three sides, and when assembled in a complementary relation, provide a six-sided complete enclosure.
Although for the purpose of my invention I have shown an exemplary form thereof, it will be apparent to those skilled in the art that other forms may be employed to utilize the principles of my invention without departing from the spirit and scope thereof. It will also be apparent that various additions, revisions, and omissions may be made to the illustrated embodiment without departing from the spirit and scope of my invention, as indicated by the appended claims.
What I claim is:
1. A shield box for electrical apparatus comprising, a pair of interfitting members, said members being constructed of flexible tensile metal having suitable electrical characteristics, each of said members having a shaped end wall portion, the end wall portion of one of said members having a pair of spaced-apart longitudinal tabs extending substantially at right angles and inclining outwardly with respect to their associated end wall porton, the second of said members having a pair of spaced-apart longitudinal side portions extending substantially at right angles to their end portion and having turned-over longitudinal edge portions constructed and arranged to slide over and inwardly flex the longitudinal tabs of said first member to provide a four-sided enclosing wall.
2. A shield box for electrical apparatus comprising, a pair of interfitting members of suitable flexible material having desired electrical characteristics, each of said members having an end wall and a pair of spaced-apart side walls extending longitudinally and integrally from opposite side edges of its associated end wall, said side walls being constructed and arranged to slideably and flexibly interfit with respect to side walls of the other of said members, each of said members having bent-over edge portions adapted 6 to slideably receive and lockingly abut extending portions of side walls of the other of said members and to support said side walls against inward and outward distortion when said members are in an assembled relationship, the bent-over portions being shaped to provide wedging engagement of increasing force as said members are moved endwise into a fully assembled relationship.
3. A rectangular shield box for electrical apparatus which comprises, a pair of interfitting members of flexible metal construction having suitable electrical characteristics, each of said members having an end wall portion and a pair of spaced-apart side wall portions extending longitudinally therefrom, the pair of side wall portions of one of said members being sloped slightly outwardly with respect to their associated end Wall portion; the other of said members having spaced-apart side wall portions provided with longitudinally-extending side edge flanges constructed and arranged to receive and slide over and flexibly compress inwardly the pair of side wall portions of the above-mentioned one of said members to provide a four-sided enclosingwall therewith; each of said members having a pair of oppositely-positioned and spaced-apart 'side flanges extending from opposite edges of its end wall portion and transversely between and spaced from adjacent side edges of its pair of side wall portions; transverse edges of the side flanges of the end wall portion of each of said members having an offset spacing with respect to adjacent side edges of its associated pair of side wall portions; the side flanges of the end wall portion of the above-mentioned one of said members being constructed and arranged to slideably receive transverse outer ends of the longitudinally-extending side wall portions of the other of said members thereover when said members are in an assembled relationship; and, the side flanges of the end wall portion of the other of said members being constructed and arranged to slideably receive transverse outer ends of the longitudinally-extending side wall portions of the abovementioned one of said members thereunder when said members are in an assembled relationship.
4. A shield box assembly for parts of an electrical apparatus which comprises, a pair of substantially U-shaped enclosure members, each of said members having a transverse end wall portion and a pair of side wall portions extending longitudinally and in a spaced-apart relation from opposite transverse sides of said end wall portion, the end wall portion of each member of said pair having a pair of side flanges extending longitudinally and in a spaced-apart relation from opposite transverse sides thereof and located between the side wall portions of the same member, each side flange of the end wall portion of each of said members having a transversely-offset relation with respect to side edges of adjacent side wall portions of the same member, and opposite side edges of each side flange of the end wall portion of each of said members having a spaced-apart relation with the side edges of adjacent side wall portions of the same member suflicient to slideably pass a side wall portion of the other member there between; each side edge of each side wall portion of each of said members being constructed and arranged to lie adjacent to a side edge of a side wall portion of the other Of said members when said members are in an assembled relation, and at least one side edge of each pair of adjacent side edges of the side wall portions of said pair of members having a side flange extending over the adjacent side edge of another member when said members are in an assembled relationship; the whole being constructed and arranged in such a manner that the side wall portions of said members provide an enclosing side wall for the box, the end wall portions of one of said members provides one end wall or the box, and the end wall portion of the other of said members provides an opposite end wall of the box.
5. A shield box assembly for parts of an electrical apparatus and having opposite end walls and an enclosing side wall extending longitudinally between the end walls which comprises, a pair of substantially U-shaped enclosure members, each of said pair of members having a transverse end wall portion and a pair of side wall portions extending longitudinally and in a spaced-apart relation integrally from opposite transverse sides of said end wall portion, the end Wall portion of each member of said pair having a pair of side flanges extending longitudinally and in a spacedapart relation integrally from opposite transverse sides thereof and located between the side wall portions of the same member, each side flange of the end wall portion of each of said members having a transversely-offset relation with respect to side edges of adjacent side wall portions of the same member, and opposite side edges of each side flange 0f the end wall portion of each of said members having a spaced-apart relation with the side edges of adjacent side wall portions of the same member sufiicient to slideably pass a side wall portion of the other member therebetween; each side edge of each side wall portion of each of said members being constructed and arranged to lie adjacent to a side edge of a side wall portion of the other of said members when said members are in an assembled relation, and side edges of each pair of adjacent side edges of the side wall portions of said pair of members having side flanges extending over the adjacent side edge of another member when said members are in an assembled relationship; the
whole being constructed and arranged in such a manner that the side wall portions of said members provide the enclosing side wall of the box, the end wall portions of one Of said members provide one end wall of the box, the end wall portion of the other of said members provides the opposite end wall of the box, and the side wall portions of each of said members are supported against inward and outward distortion by the side flanges of the end wall portions and by the extending side flanges of the side wall portions of said members.
6. A shield box as defined in claim 5, wherein the end wall portions of each of said members are of rectangular shape and define a six-sided enclosure with the side wall portions of said members.
7. A shield box as defined in claim 5, wherein the side flanges of the end wall portion of one of said members are transversely-inwardly offset with respect to side edges of adjacent side wall portions thereof, the defined extending side flanges are along opposite side edges of the side flanges of the end wall portion of the other of said members, and the side flanges of the end wall portion of the other of said members are transversely-outwardly offset with respect to side edges or adjacent side wall portions thereof.
8. A shield box as defined in claim 5, wherein said members are of flexible construction, and a pair of side wall portions of one of said members are sloped with respect to a longitudinal plane of the pair of side wall portions of the other member in such a manner that said members having a wedging engagement when moved into an assembled relationship with respect to each other.
9. A shield box as defined in claim 5, wherein the side flanges of the end portions of said members are sloped with respect to a plane representing side wall portions that slide therealong to provide a wedging engagement therebetween when said members are moved into an assembled relation with respect to each other.
10. A shield box for electrical apparatus comprising, a pair of interfitting members of suitable flexible material having desired electrical characteristics, each of said members having an end wall and a pair of spaced-apart side walls extending longitudinally and integrally from opposite side edges of its associated end wall, said side walls of one of said members having turnedover longitudinal edge portions constructed and arranged to slidably and flexibly interfit with respect to side walls of the other of said members, at least one of said members having bent-over edge portions adapted to slidably receive and lockingly abut extending portions of side walls of the other of said members and to support said walls against inward and outward distortion when said members are in an assembled relationship, the bent-over portions being shaped to provide wedging engagement of increasing force as said members are moved endwise into a fully assembled relationship.
JOHN H. COOPER.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,481,415 Casper Jan. 22, 1924 1,698,252 Ashe Jan. 8, 1929 1,943,255 Booth Jan. 9, 1934 FOREIGN PATENTS Number Country Date 9,560 Great Britain 1905
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US698716A US2488710A (en) | 1946-09-23 | 1946-09-23 | Enclosing shield for electrical applications |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US698716A US2488710A (en) | 1946-09-23 | 1946-09-23 | Enclosing shield for electrical applications |
Publications (1)
Publication Number | Publication Date |
---|---|
US2488710A true US2488710A (en) | 1949-11-22 |
Family
ID=24806377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US698716A Expired - Lifetime US2488710A (en) | 1946-09-23 | 1946-09-23 | Enclosing shield for electrical applications |
Country Status (1)
Country | Link |
---|---|
US (1) | US2488710A (en) |
Cited By (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2652521A (en) * | 1949-08-22 | 1953-09-15 | Nu Way Corp | Shield for transformer coils |
US2712880A (en) * | 1952-04-19 | 1955-07-12 | Moore George Arlington | Duo-part container |
US2722599A (en) * | 1951-04-28 | 1955-11-01 | Avco Mfg Corp | Multi-element radiation shield |
US2731167A (en) * | 1952-03-26 | 1956-01-17 | Moore George Arlington | Heavy duty containers |
US2741390A (en) * | 1952-04-19 | 1956-04-10 | Moore George Arlington | Heavy duty containers |
US2770409A (en) * | 1954-03-05 | 1956-11-13 | Moore George Arlington | Heavy and light duty container structure and method of making same |
US2774504A (en) * | 1955-04-28 | 1956-12-18 | Moore George Arlington | Container for liquid commercial products |
US2798897A (en) * | 1953-05-11 | 1957-07-09 | Du Mont Allen B Lab Inc | Shield for printed wiring |
US2825483A (en) * | 1956-02-01 | 1958-03-04 | Jr Andrew J Maron | Weatherproof enclosure primarily for electrical apparatus |
US2855454A (en) * | 1953-10-29 | 1958-10-07 | Alden Milton | Housing for mounting electrical circuit components |
US2860216A (en) * | 1956-02-03 | 1958-11-11 | Burton F Hubbard | Potentiometric devices |
US2968416A (en) * | 1958-09-19 | 1961-01-17 | Rutten Marion | Silo lug |
US2992702A (en) * | 1958-07-09 | 1961-07-18 | Continental Can Co | Air filter frame |
US3018615A (en) * | 1957-09-26 | 1962-01-30 | Time Stop Inc | Automatic cancelling or re-setting parking meter unit |
US3046453A (en) * | 1958-09-19 | 1962-07-24 | Fed Pacific Electric Co | Circuit breakers and enclosures therefor |
US3222449A (en) * | 1962-07-23 | 1965-12-07 | Gtc Kk | Magnetic shield arrangements |
US3281005A (en) * | 1963-01-21 | 1966-10-25 | Gen Electric | Surface metal raceway fittings |
US3348609A (en) * | 1966-04-29 | 1967-10-24 | Lambda Electronics Corp | Multi-positional power supply module and heat exchange techniques |
US3908905A (en) * | 1972-12-20 | 1975-09-30 | Globol Werk | Demountable multi-part container assembly |
US3999679A (en) * | 1973-08-13 | 1976-12-28 | Rockwell International Corporation | Mounting cover |
US4102557A (en) * | 1977-03-01 | 1978-07-25 | Pace Incorporated | Collapsible container |
US4263472A (en) * | 1979-05-23 | 1981-04-21 | Maheu Joseph S | Electrical box |
US4331285A (en) * | 1980-03-24 | 1982-05-25 | Hewlett-Packard Company | Method for fabricating a magnetic shielding enclosure |
US4785136A (en) * | 1986-11-10 | 1988-11-15 | Mollet John R | Electromagnetic interference shielding cover |
US4953002A (en) * | 1988-03-31 | 1990-08-28 | Honeywell Inc. | Semiconductor device housing with magnetic field protection |
WO1992017046A1 (en) * | 1991-03-13 | 1992-10-01 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Device for contacting the casing and cover of a closed housing |
US5255782A (en) * | 1992-07-31 | 1993-10-26 | Kim Manufacturing Company | Battery tray device |
EP0675516A2 (en) * | 1994-04-01 | 1995-10-04 | SEVENLIFE SAS DI DELLAPASQUA ARMANDO & C. | Screening of electromagnetic emission into the sheath for cellular mobile telephone |
US5539150A (en) * | 1995-01-18 | 1996-07-23 | American Etching & Manufacturing | Kit and method of making radiation shields |
US5581047A (en) * | 1994-02-03 | 1996-12-03 | Orion Industries Incorporated | Electromagnetic interference sheild |
US5614694A (en) * | 1995-03-31 | 1997-03-25 | Motorola, Inc. | One piece open and closable metal RF shield |
US6607308B2 (en) | 2001-02-12 | 2003-08-19 | E20 Communications, Inc. | Fiber-optic modules with shielded housing/covers having mixed finger types |
US6659655B2 (en) | 2001-02-12 | 2003-12-09 | E20 Communications, Inc. | Fiber-optic modules with housing/shielding |
US20100006470A1 (en) * | 2008-07-14 | 2010-01-14 | Canon Anelva Corporation | Vacuum vessel, vacuum processing apparatus comprising vacuum vessel, and vacuum vessel manufacturing method |
EP3266346A1 (en) * | 2016-07-04 | 2018-01-10 | Peka-Metall A.G. | Storage compartment which can be instered in a cabinet |
US10355252B2 (en) * | 2015-06-15 | 2019-07-16 | Toyota Jidosha Kabushiki Kaisha | Method for manufacturing bottomed cuboid battery container |
EP3751633A1 (en) * | 2019-06-10 | 2020-12-16 | Samsung SDI Co., Ltd. | Secondary battery |
US11281340B2 (en) | 2019-01-18 | 2022-03-22 | Cirque Corporation | Radio frequency transparent capacitive touch systems and methods |
US20220093372A1 (en) * | 2019-03-28 | 2022-03-24 | Lam Research Corporation | Showerhead shroud |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190509560A (en) * | 1905-05-06 | 1905-12-21 | William Thom Jack | Improvements in and relating to Tanks, Cisterns, and the like. |
US1481415A (en) * | 1921-09-13 | 1924-01-22 | Casper Albert | Meter box |
US1698252A (en) * | 1927-03-12 | 1929-01-08 | Marselius T Ashe | Inclosure |
US1943255A (en) * | 1933-03-30 | 1934-01-09 | Noblitt Sparks Ind Inc | Radio container |
-
1946
- 1946-09-23 US US698716A patent/US2488710A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190509560A (en) * | 1905-05-06 | 1905-12-21 | William Thom Jack | Improvements in and relating to Tanks, Cisterns, and the like. |
US1481415A (en) * | 1921-09-13 | 1924-01-22 | Casper Albert | Meter box |
US1698252A (en) * | 1927-03-12 | 1929-01-08 | Marselius T Ashe | Inclosure |
US1943255A (en) * | 1933-03-30 | 1934-01-09 | Noblitt Sparks Ind Inc | Radio container |
Cited By (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2652521A (en) * | 1949-08-22 | 1953-09-15 | Nu Way Corp | Shield for transformer coils |
US2722599A (en) * | 1951-04-28 | 1955-11-01 | Avco Mfg Corp | Multi-element radiation shield |
US2731167A (en) * | 1952-03-26 | 1956-01-17 | Moore George Arlington | Heavy duty containers |
US2712880A (en) * | 1952-04-19 | 1955-07-12 | Moore George Arlington | Duo-part container |
US2741390A (en) * | 1952-04-19 | 1956-04-10 | Moore George Arlington | Heavy duty containers |
US2798897A (en) * | 1953-05-11 | 1957-07-09 | Du Mont Allen B Lab Inc | Shield for printed wiring |
US2855454A (en) * | 1953-10-29 | 1958-10-07 | Alden Milton | Housing for mounting electrical circuit components |
US2770409A (en) * | 1954-03-05 | 1956-11-13 | Moore George Arlington | Heavy and light duty container structure and method of making same |
US2774504A (en) * | 1955-04-28 | 1956-12-18 | Moore George Arlington | Container for liquid commercial products |
US2825483A (en) * | 1956-02-01 | 1958-03-04 | Jr Andrew J Maron | Weatherproof enclosure primarily for electrical apparatus |
US2860216A (en) * | 1956-02-03 | 1958-11-11 | Burton F Hubbard | Potentiometric devices |
US3018615A (en) * | 1957-09-26 | 1962-01-30 | Time Stop Inc | Automatic cancelling or re-setting parking meter unit |
US2992702A (en) * | 1958-07-09 | 1961-07-18 | Continental Can Co | Air filter frame |
US2968416A (en) * | 1958-09-19 | 1961-01-17 | Rutten Marion | Silo lug |
US3046453A (en) * | 1958-09-19 | 1962-07-24 | Fed Pacific Electric Co | Circuit breakers and enclosures therefor |
US3222449A (en) * | 1962-07-23 | 1965-12-07 | Gtc Kk | Magnetic shield arrangements |
US3281005A (en) * | 1963-01-21 | 1966-10-25 | Gen Electric | Surface metal raceway fittings |
US3348609A (en) * | 1966-04-29 | 1967-10-24 | Lambda Electronics Corp | Multi-positional power supply module and heat exchange techniques |
US3908905A (en) * | 1972-12-20 | 1975-09-30 | Globol Werk | Demountable multi-part container assembly |
US3999679A (en) * | 1973-08-13 | 1976-12-28 | Rockwell International Corporation | Mounting cover |
US4102557A (en) * | 1977-03-01 | 1978-07-25 | Pace Incorporated | Collapsible container |
US4263472A (en) * | 1979-05-23 | 1981-04-21 | Maheu Joseph S | Electrical box |
US4331285A (en) * | 1980-03-24 | 1982-05-25 | Hewlett-Packard Company | Method for fabricating a magnetic shielding enclosure |
US4785136A (en) * | 1986-11-10 | 1988-11-15 | Mollet John R | Electromagnetic interference shielding cover |
US4953002A (en) * | 1988-03-31 | 1990-08-28 | Honeywell Inc. | Semiconductor device housing with magnetic field protection |
WO1992017046A1 (en) * | 1991-03-13 | 1992-10-01 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Device for contacting the casing and cover of a closed housing |
US5255782A (en) * | 1992-07-31 | 1993-10-26 | Kim Manufacturing Company | Battery tray device |
US5581047A (en) * | 1994-02-03 | 1996-12-03 | Orion Industries Incorporated | Electromagnetic interference sheild |
EP0675516A2 (en) * | 1994-04-01 | 1995-10-04 | SEVENLIFE SAS DI DELLAPASQUA ARMANDO & C. | Screening of electromagnetic emission into the sheath for cellular mobile telephone |
EP0675516A3 (en) * | 1994-04-01 | 1997-12-10 | SEVENLIFE SAS DI DELLAPASQUA ARMANDO & C. | Screening of electromagnetic emission into the sheath for cellular mobile telephone |
US5539150A (en) * | 1995-01-18 | 1996-07-23 | American Etching & Manufacturing | Kit and method of making radiation shields |
US5614694A (en) * | 1995-03-31 | 1997-03-25 | Motorola, Inc. | One piece open and closable metal RF shield |
US6659655B2 (en) | 2001-02-12 | 2003-12-09 | E20 Communications, Inc. | Fiber-optic modules with housing/shielding |
US6607308B2 (en) | 2001-02-12 | 2003-08-19 | E20 Communications, Inc. | Fiber-optic modules with shielded housing/covers having mixed finger types |
US6874953B2 (en) | 2001-02-12 | 2005-04-05 | Jds Uniphase Corporation | Methods and apparatus for fiber-optic modules with shielded housings/covers with fingers |
US20100006470A1 (en) * | 2008-07-14 | 2010-01-14 | Canon Anelva Corporation | Vacuum vessel, vacuum processing apparatus comprising vacuum vessel, and vacuum vessel manufacturing method |
US8763833B2 (en) * | 2008-07-14 | 2014-07-01 | Canon Anelva Corporation | Vacuum vessel, vacuum processing apparatus comprising vacuum vessel, and vacuum vessel manufacturing method |
US10355252B2 (en) * | 2015-06-15 | 2019-07-16 | Toyota Jidosha Kabushiki Kaisha | Method for manufacturing bottomed cuboid battery container |
CN109414114A (en) * | 2016-07-04 | 2019-03-01 | 瑞士铂格(Peka)集团 | The storage compartment being inserted into cabinet element |
WO2018007286A1 (en) * | 2016-07-04 | 2018-01-11 | Peka-Metall Ag | Storage compartment that can be inserted into a cabinet element |
EP3266346A1 (en) * | 2016-07-04 | 2018-01-10 | Peka-Metall A.G. | Storage compartment which can be instered in a cabinet |
US10646039B2 (en) | 2016-07-04 | 2020-05-12 | Peka-Metall Ag | Storage compartment that can be inserted into a cabinet element |
US11281340B2 (en) | 2019-01-18 | 2022-03-22 | Cirque Corporation | Radio frequency transparent capacitive touch systems and methods |
US20220093372A1 (en) * | 2019-03-28 | 2022-03-24 | Lam Research Corporation | Showerhead shroud |
EP3751633A1 (en) * | 2019-06-10 | 2020-12-16 | Samsung SDI Co., Ltd. | Secondary battery |
US11489223B2 (en) | 2019-06-10 | 2022-11-01 | Samsung Sdi Co., Ltd. | Secondary battery |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2488710A (en) | Enclosing shield for electrical applications | |
US3201731A (en) | Transformer core and lamination therefor | |
US1801214A (en) | Edgewise coil and method of making the same | |
US4711019A (en) | Method of making core laminations, and punch die for carrying out the method | |
DE112018006472T5 (en) | A COIL ARRANGEMENT FOR USE IN A CONTINUOUS ACTUATION REACTOR | |
US2489977A (en) | Laminated core | |
US2348003A (en) | Magnetic core | |
US4723349A (en) | Method of making fixture for the window of a magnetic core | |
DE2309727A1 (en) | PROCESS FOR MANUFACTURING IN PARTICULAR USE AS CONTROL UNIT FOR GAS DISCHARGE LAMPS OR TRANSFORMERS | |
EP0024319B1 (en) | Process for making e-shaped core laminations and i-shaped yoke laminations for a choke or transformer, particularly for gas discharge lamps | |
US2454609A (en) | Method of making laminations | |
US1690154A (en) | Transformer | |
US2302571A (en) | Method of making electrical laminations | |
US2533779A (en) | Lug fastening means for electrical shields | |
US3461758A (en) | Method of making scrapless laminations for producing a plurality of units | |
US1709054A (en) | Magnetic shield | |
US3043971A (en) | Improved laminated frame and method of making same | |
JPH03147307A (en) | Punching for iron core | |
US1550889A (en) | Induction device and magnetic circuits for the same | |
US1884385A (en) | Electrical apparatus and method of making terminal strips therefor | |
US2974401A (en) | Three-phase core for electrical transformers and method of manufacturing the same | |
US4766407A (en) | Fixture for the window of a magnetic core | |
DE628277C (en) | Filters for electrical vibrations | |
US3413579A (en) | Magnetic field assembly for electro-mechanical transducers | |
US3646493A (en) | Magnetic circuit for an inductor or transformer |