US3417359A - Protectors for electric circuits - Google Patents
Protectors for electric circuits Download PDFInfo
- Publication number
- US3417359A US3417359A US590370A US59037066A US3417359A US 3417359 A US3417359 A US 3417359A US 590370 A US590370 A US 590370A US 59037066 A US59037066 A US 59037066A US 3417359 A US3417359 A US 3417359A
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- US
- United States
- Prior art keywords
- terminal
- fuse
- contact
- recess
- electric
- 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
- 230000001012 protector Effects 0.000 title description 2
- 238000009413 insulation Methods 0.000 description 15
- 239000012212 insulator Substances 0.000 description 13
- 239000004020 conductor Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 7
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000004033 plastic Substances 0.000 description 4
- 239000003566 sealing material Substances 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 241000270295 Serpentes Species 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000002654 heat shrinkable material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/20—Bases for supporting the fuse; Separate parts thereof
- H01H85/201—Bases for supporting the fuse; Separate parts thereof for connecting a fuse in a lead and adapted to be supported by the lead alone
Landscapes
- Fuses (AREA)
Description
United States Patent ABSTRACT OF THE DISCLOSURE An insulating member adjacent the line contact of a holder for electric fuses keeps the terminal of an electric fuse from electrically engaging that contact until that terminal has moved the forward face of that insulating member rearwardly relative to that contact.
This invention relates to improvements in protectors for electric circuits. More particularly, this invention relates to improvements in holders for electric fuses.
It is, therefore, an object of the present invention to provide an improved fuse holder.
It is frequently desirable to dispose electric fuses within holders that can fully enclose those fuses and thereby protect persons and nearby objects from engagement with electrically live parts of those fuses. One such fuse holder that has been found to be extremely useful and desirable has a two-section housing of insulating material, and each section of that housing has a contact located within a recess therein. In using that fuse holder, the user thereof can force one terminal of a fuse into a cuplike contact which is located within the recess in one of the sections of that fuse holder and which is connected to the load side of the circuit, and can then use that one section of that fuse holder to move that fuse into engagement with a contact which is located within the recess in the other section of that fuse holder and which is connected to the line side of that circuit. Prior to the time the terminal of that fuse engages the contact which is connected to the line side of the circuit, the two sections of the fuse holder will completely enclose that fuse and will thereby keep the fingers or hands of the user of that fuse holder from engaging an electrically live part of that fuse. As a result, the said fuse holder is extremely useful and desirable.
If the user of such a fuse holder failed to follow standard electrical practice, and thus failed to use the one section of the fuse holder and the cup-like contact therein to move a fuse into engagement with the line contact in the other section of the fuse holderand, instead, used his fingers to move that fuse into engagement with that line contact-he might receive a shock. It would be desirable to provide a fuse holder which could keep even those persons who fail to follow standard electrical practice, as they insert fuses into fuse holders, from receiving electrical shocks. The present invention provides such a fuse holder; and it does so by mounting a member of insulation forwardly of the contact, in the other section of the fuse holder, which is connected to the line side of the circuit. That member of insulation will intercept the fuse before that fuse can move far enough into the other section of the fuse holder to receive suflicient support from that section to be held by that section. As a result, that fuse will fall away from that section of the fuse holder, and will thus be kept from becoming electrically live. It is, therefore, an object of the present invention to provide a fuse holder which mounts a member of insulation forwardly of the contact, in the other section of the fuse holder, that is connected to the line side of the circuit, and which requires that member of insulation to be moved or compressed by the inner terminal of a fuse before that inner terminal can engage that contact.
Other and further objects and advantages of the present invention should become apparent from an examination of the drawing and accompanying description.
In the drawing and accompanying description two preferred embodiments of the present invention are shown and described but it is to be understood that the drawing and accompanying description are for the purpose of illustration only and do not limit the invention and that the invention will be defined by the appended claims.
In the drawing, FIG. 1 is a front elevational view of one preferred embodiment of fuse holder that is made in accordance with the principles and teachings of the present invention,
FIG. 2 is a sectional view, on a larger scale, through the fuse holder of FIG. 1, and it is taken along the plane indicated by the line 22 in FIG. 1,
FIG. 3 is a sectional view, on the scale of FIG. 2, it is taken along the plane indicated by the line 22 in FIG. 1, and it shows the left-hand portion of the fuse holder as it appears when the fuse has been removed from that fuse holder,
FIG. 4 is a partially broken-away, front elevational view of part of a fuse holder that is similar to the fuse holder of FIG. 1 but which has a different movable contact,
FIG. 5 is another partially broken-away, front elevational view of the fuse holder of FIG. 4, and it shows that fuse holder as it appears when the fuse has been removed, and
FIG. 6 is a sectional view through the fuse holder of FIG. 4, and it is taken along the plane indicated by the line 66 in FIG. 5.
Referring to the drawing in detail, the numeral generally denotes one preferred embodiment of fuse holder that is made in accordance with the principles and teachings of the present invention. That fuse holder has a body portion 22 of generally cylindrical form which has a cylindrical recess 24 therein. A wall 26 is provided at the right-hand end of the cylindrical recess 24, and the left-hand end of that recess is open. A passage 28 is provided in the wall 26; and an annular recess 30 is provided in the outer face of that wall, and that recess communicates with that passage. An annular shoulder 32, of generally rectangular cross section, is formed on the exterior of the body portion 22; and that annular shoulder is closer to the left-hand end of that body portion than it is to the right-hand end of that body portion, as shown particularly by FIG. 2. A shallow annular rib 34 is formed on the exterior of the body portion 22 a short distance to the right of the annular shoulder 32. The body portion 22 is preferably formed from an inexpensive but tough plastic material; and phenolic resins constitute plastic materials which are very useful in forming that body portion.
The numeral 38 denotes a terminal which has a flanged inner face 40; and a short portion of the length of that terminal is dimensioned to fit snugly within the passage 28 in the wall 26 of the body portion 22, while the flanged inner face 40 is dimensioned so it cannot pass through that passage. The terminal 38 also has an elongated shank with an elongated recess 46 therein. A cup-like contact 42 has an opening in the closed end thereof through which the shank and the short portion of the terminal 38 extends; but the flanged inner face 40 of that terminal is too large to pass through that opening. The flanged inner face 40 of the terminal 38 is used to press the cup-like contact 42 against the wall 26 of the body portion 22; and then the periphery of the outer face of the short portion of that terminal will be staked or riveted into the annular recess 30 in that body portion to fixedly secure that terminal and that contact to each other and to that body portion.
A sleeve 48 of heat-shrinkable insulation is telescoped over the shank of the terminal 38; and that sleeve extends into the annular recess 30 in the body portion 22 to abut the short portion of that terminal. That sleeve is shrunk into intimate engagement with the terminal 38 by suitable application of heat.
A sealing material 50, such as an epoxy resin, is used to fill the annular recess 30 in the right-hand end of the body member 22. That sealing member provides a watertight seal between that body member and the terminal 38.
The numeral 52 denotes an internally-threaded nut; and that nut has an end wall 54 with a large opening therein. The smallest diameter of the thread of the internallythreaded nut 52 is large enough to enable that nut to freely telescope over the annular shoulder 32 on the body portion 22; but the diameter of the opening in the end wall 54 of that internally-threaded nut is smaller than the diameter of that annular shoulder. As a result, that end wall can abut and bear against the right-hand face of the annular shoulder 32 on the body member 22, as shown by FIG. 2; and, in abutting and bearing against that annular shoulder, that wall can prevent further movement of the internally-threaded nut 52 to the left in FIG. 2. The diameter of the opening in the end wall 54 of the internally-threaded nut 52 is very close to the diameter of the shallow annular rib 34 at the exterior of the body portion 22; and, as a result, an appreciable force must be applied to the internally-threaded nut 52 to cause the opening in the end wall 54 thereof to slip over that annular rib. Thereafter, that shallow annular rib will pre- I A wall 60 is provided at the left-hand of the recess 58, I
and the other end of that recess communicates with a larger-diameter cylindrical recess 72 in the body portion 156. The recess 72 is in a larger-diameter section 71 of that body portion; and that recess opens to the righthand end of that body portion. The recess 72 is dimensioned to telescope over the left-hand end of the body portion 22 as shown by FIG. 2. An abrupt annular shoulder 70 is provided intermediate the larger diameter section 71 of the body portion 156 and the rest of that body portion. A passage 62 is provided in the wall 60 of the body portion 156; and an annular recess 64 is provided in the outer face of that wall, and that recess co mmunicates with that passage. A shallow annular rib 66 is formed on the exterior of the body portion 156 a short distance to the left of the annular shoulder 70. The body portion 156 is preferably formed from an inexpensive but tough plastic material, and phenolic resins constitute plastic materials which are very useful in forming that body portion.
The numeral 176 denotes a terminal which has a flanged inner face 178; and a short portion of that terminal is dimensioned to fit snugly within the passage 62 in the wall 60 of the body portion 156, while the flanged inner face. 178 is dimensioned so it cannot pass through that passage. The terminal 176 has a rivet-like shank 181 extending beyond the passage 62 in the end wall 60 of the body portion 156; and that rivet-like shank extends through a passage in the end wall of an elongated, cup-like, terminal extension 179. A sealing material 192, such as an epoxy resin, is disposed within the annular recess 64 in the left-hand face of the wall 60 of the body portion 156; and that sealing material provides a water-tight seal between the terminal 176 and the body portion 156. After the sealing material 192 has hardened, the passage in the end wall of the terminal extension 179 is telescoped over the shank 181 of the terminal 176; and then the outer end of that shank is riveted over to permanently secure that terminal extension to that terminal. Solder 183 is then applied to the riveted-over inner end of the shank 181 and to the interior of the terminal extension 179 to electrically bond them together. Thereafter, a sleeve 190 of heat-shrinkable material is telescoped over the exterior of the terminal extension 179 and over a considerable portion of the exterior of the body portion 156, and then that sleeve is shrunk into intimate engagement with that terminal extension and that body portion. That sleeve will keep moisture, corrosive fumes, salt spray, or the like from reaching the junction between the terminal 176 and the terminal extension 179.
The numeral 94 denotes an externally-threaded nut; and the thread on that nut is formed and dimensioned to mate with the thread on the internally-threaded nut 52. The nut 94 has an end wall 98 with a large opening therein; and the inner diameter of that nut is large enough to enable that nut to telescope freely over the large-diameter section 71 of the body portion 156, but the diameter of the opening in the end wall 98 of that nut is smaller than the diameter of that larger-diameter section. As a result, the end wall 98 can abut and bear against the shoulder on the body portion 156, and can thereby prevent further movement of the nut 94 to the right in FIG. 2. The diameter of the opening in the end wall 98 of the nut 94 is very close to the diameter of the shalow, annular rib 66, at the exterior of the body member 156; and, as a result, an appreciable force must be applied to the nut 94 to cause the opening in the end wall 98 thereof to slip over that annular rib. Thereafter, that shallow, annular rib will prevent accidental separation of the nut 94 from the body portion 156.
The internally-threaded nut 52 and the externallythreaded nut 94 are preferably made from a tough material which is capable of having strong threads formed thereon. One such material is nylon. Both of the nuts 52 and 94 have polygonal wrench-receiving surfaces at the exteriors thereof; and those surfaces enable wrenches to grip and tighten those nuts.
The numeral 200 denotes a movable contact which is located within the recess 58 in the body portion 156; and that movable contact is generally cylindrical in form. An annular projection 201 extends from the left-hand face of that movable contact, and that annular projection accommodates one end of a flexible conductor 84; and the other end of that flexible conductor is embedded within a recess in the terminal 176. Solder is used to bond the ends of the flexible conductor 84 to the terminal 176 and to the movable contact 200.
A helical compression spring 88 surrounds theflexible conductor 84; and the left-hand end of that spring bears against the flanged inner face 178 of the terminal 176, while the right-hand end of that spring bears against the left-hand face of the movable contact 200. A compression spring 204 has the left-hand end thereof disposed within a cylindrical recess 202 in the right-hand face of the movable contact 200, and has the right-hand end thereof surrounding and intimately engaging a cylindrical projection at the left-hand face of an insulator 206. Preferably, the left-hand end of the spring 204 has a larger diameter than the right-hand end of that spring. The insulator 206 is dimensioned so it can telescope within the recess 202 in the movable contact 200; and, preferably, that insulator is circular in end view. The spring 204 urges the insulator 206 to the extended position shown by FIG. 3,
but that spring can yield to permit that insulator to move within the recess 202 in the movable contact 200, as shown particularly by FIG. 2.
The numeral denotes an electric fuse which is dimensioned to telescope within the cylindrical recesses 24 and 58, respectively, in the body portions 22 and 156. That fuse has ferrule-like terminals at the opposite ends thereof; and one of those terminals will extend into, and
be held by, the cup-like contact 42, while the other of those terminals will abut the insulator 206 and can abut the annular right-hand end of the movable contact 200. The cup-like contact 42 will grip the right-hand terminal of the fuse 100, and it will apply such strong holding forces to that terminal that an appreciable force will have to be applied to the fuse 100 to free it from that cup-like contact. Such holding forces are desirable, because they will prevent accidental separation of the fuse 100 from the cup-like contact 42.
The numeral 102 denotes an O-ring which is made from a resilient material. That O-ring is dimensioned to telescope over the left-hand end of the body portion 22 and to abut the left-hand face of the annular shoulder 32 on that body portion. The O-ring 102 will be engaged by the right-hand end face of the larger diameter section 71 of the body portion 156.
In using the fuse holder of FIGS. 1-3, the insulationfree end of a conductor, not shown, which is connected to the line side of an electrical circuit is telescoped within the terminal extension 179, and then a crimping tool is used to crimp that terminal extension tightly onto that end of that conductor. Thereafter, field-installed insulation, such as splicing compound electrical tape, friction tape, or the like, is used to cover the insulation-free portion of that terminal extension and the insulation-free portion of that conductor. The sleeve 190 of insulation will not only perform an insulating function but will also serve as a surface to which the field-installed insulation will readily adhere.
The insulation-free end of a conductor, not shown, which is connected to the load side of the electrical circuit is telescoped within the recess 46 and the terminal 38; and then a crimping tool is used to crimp the shank of that terminal tightly onto that end of that conductor. Thereafter, field-installed insulation, such as splicing compound, electrical tape, friction tape, or the like is used to cover the insulation-free portion of the shank of terminal 38 and the insulation-free portion of the end of that conductor. The sleeve 48 of insulation will not only perform an insulating function but will also serve as a surface to which the field-installed insulation will readily adhere.
A fuse 100 is then telescoped into the cylindrical recess 24 in the body portion 22, and the inner terminal of that fuse is pressed into the cup-like contact 42 until that inner terminal abuts the flanged inner face 40 of the terminal 38. The outer terminal of the fuse 100 will project outwardly beyond the end of the body portion 22; but the user of the fuse holder 120 cannot receive a shock if he touches that fuse tenminal; because the cup-like contact 42 and the terminal 38 will connect that fuse to the load side rather than to the line side of the electrical circuit.
The user of the fuse holder 120 will then align the recess 24 in the body portion 22 with the recess 58 in the body portion 156; and will move those body portions toward each other. The outer terminal of the fuse 100 will be moved into and through the cylindrical recess 72 in the larger-diameter section 71 of the body portion 156, and will then be moved into the cylindrical recess 58 in that body portion. As the outer terminal of the fuse 100 moves through the recess 72, the insulator 206 will receive that outer terminal and will keep that outer terminal from immediately engaging the movable contact 200. Not until the outer terminal of the fuse 100 has moved all the way through the recess 72 and has entered the recess 58 can that outer terminal of that fuse closely approach the movable contact 200. By the time the outer terminal of the fuse 100 engages the movable contact 200, the left-hand end of the body portion 52 will have telescoped within the outer end of the cylindrical recess 72 in the larger-diameter section 71 of the body portion 156. This is important; because it makes absolutely certain that any are which could form as the fuse 100 engaged the movable contact 200 would be wholly enclosed and could not injure the user of the fuse holder, and because it makes absolutely certain that the outer terminal of the fuse 100 is completely enclosed by the body portions 22 and 156 before that outer terminal can engage the live movable contact 200.
As shown by the drawing, the diameter of the wire of which the spring 204 is formed is smaller than the diameter of the wire of which the spring 88 is formed. As a result, the spring 204 will yield and will permit the insulator 206 to move wholly within the recess 202 in the movable contact 200 before the spring 88 is compressed to any appreciable extent. The yielding nature of the spring 204 is important; because it makes certain that the insulator 206 will permit the outer terminal of the fuse 100 to seat solidly against the annular right-hand end of the movable contact 200 and provide the intimate engagement which is required to minimize contact resistance between that movable contact and that outer terminal.
As the left-hand end of the body portion 22 is telescoped within the cylindrical recess 72 in the largerdiameter section 71 of the body portion 156, the nut 52 will be rotated to force the external thread on the nut 94- to move inwardly of the internal thread on the nut 52. The end walls 54 and 98, respectively, of the nuts 52 and 94 will be forced toward each other; and those end walls will act through the shoulders 32 and to force the left-hand face of the shoulder 32 toward the righthand end of the larger-diameter section 71 of the body portion 156. The left-hand face of that shoulder and that right-hand face of that larger-diameter section will abut and compress the O-ring 102, thereby forming a tight seal between themselves and that O-ring.
As the end walls 54 and 98, respectively, of the nuts 52 and 94 are forced to move toward each other, the lefthand terminal of the fuse will force the movable contact 200 to move toward the position shown by FIG. 2. The flexible conductor 84 and the helical compression spring 88 will both yield to permit that contact to move toward that position. However, the helical compression spring 88 will develop strong restorative forces therein which will hold the right-hand face of the movable contact 200 in intimate engagement with the left-hand terminal of the fuse 100.
Whenever the fuse 100 is to be inspected or replaced, it is only necessary to rotate the nut 52 in the reverse direction until the nut is freed from the nut 94, to move the body portion 22 away from the body portion 156, and to withdraw the fuse 100 from its position within the recess 24 in the body portion 22. If an arc tends to form as the left-hand terminal of the fuse 100 is moved away from the movable contact ZOO-and such an arc could form if the fuse 100 was intact and the fuse holder was opened while that fuse was carrying current that arc would be initiated and could be extinguished while the left-hand end of the body portion 22 was disposed within the cylindrical recess 72 in the largerdiameter section 71 of the body portion 156. As a result, that are could be confined and need not injure the user of the fuse holder 120.
Prior to the time the left-hand end of the body portion 22 moves out of the recess 72 in the larger-diameter section 71 of the body portion 156, the compression .spring 204 and the insulator 206 will have forced the end of the fuse 100 away from the movable contact 200. This is desirable because it makes certain that the outer terminal of that fuse could not remain in engagement with the movable contact 200, and thus makes certain that neither of the terminals of that fuse could be electrically live. As a result, even if, somehow, the fuse 100 could remain in the recess 72 of the body portion 156, instead of moving with the body portion 22, that fuse would not be electrically live and would thus not constitute a hazard to the user of the fuse holder.
The spring 204 and the insulator 206 also can protect the user of the fuse holder 120 from shock in the event that user should try to use his fingers to insert the electric fuse 100 directly into the body portion 156. If that user should try to insert the fuse 100 into the body portion 156, the left-hand terminal of that fuse would be intercepted by the insulator 206 before that left-hand terminal could enter the recess 58 in that body portion. A fuse that was stopped short of the recess 58 in the body portion 156 could not receive sufficient support from that body portion to be held by that body portion; and, instead, would fall away from that body portion. As a result, any such fuse would be kept from becoming electrically live.
FIGS. 46 show a different form of movable contact and member of insulation for the fuse holder 120. Thus, FIGS. 46 show a movable contact 220 which has an annular projection 201 at the left-hand face thereof, to receive the right-hand end of the flexible conductor 84, and which has a cylindrical projection 221 at the righthand face thereof. A member 222 of insulation is secured to and carried by the movable contact 220; and that member preferably is made from a yieldable insulating material such as synthetic rubber. That member is annular in form, and it encircles the cylindrical projection 221 on the movable contact 220.
The member 222, in its unstressed state, is thicker than the cylindrical projection 221 on the movable contact 220; but the material of which that member is made is sufficiently resilient to enable the thickness of that member to be reduced to a value less than that of the cylindrical portion 221. This means that whenever a fuse 100 is introduced into the body portion 22 of the fuse holder, and then has the left-hand terminal thereof introduced into the body portion 156, the left-hand terminal of that fuse will engage the member 222 before it can engage the cylindrical projection 221 on the movable contact 220. However, as the nuts 52 and 94 are tightened, the member 222 will become compressed and will permit the lefthand terminal of the fuse to move into intimate electrical engagement with the cylindrical projection 221 on I the movable contact 20.
The member 222 of insulation will perform the functions performed by the insulator 206 and the spring 204 shown in FIGS. 13. Specifically, that member will keep any part of the fuse 100 from becoming electrically live until after the left-hand end of the body portion 22 has telescoped into the recess 72 in the larger-diameter section 71 of the body portion 156, and thus has made sure that the fuse holder has completely enclosed that fuse. Furthermore, that member can keep a user from being shocked if he inadvertently attempts to insert an electric fuse 100 directly into the body portion 156, rather than introduce that fuse into the body portion 22 and then use that body portion to introduce that fuse into the body portion 156. In addition, the member 222 will push the left-hand terminal of the electric fuse 100 away from the movable contact 220 prior to the time the left-hand end of the body portion 22 is moved out of the recess 72 in the body portion 156. The member 222 has been shown as an annulus surrounding the cylindrical projection 221 on the movable contact 220; but that member could be mounted adjacent a fixed contact and it could be given other configurations. For example, that member could be made as a cylindrical pad which was held within a recess in a stationary contact. Regardless of the configuration given the member 222, and regardless of the contact with which it is used, that member should have an unstressed dimension which would enable it to intercept the terminal of a fuse being moved toward'that contact and should have a stressed dimension which would enable that terminal of that fuse to intimately engage that contact.
The fuse holders shown in FIGS. 1-6 are known as in line fuse holders; and such fuse holders are very useful. The present invention also is usable with fuse holders that are known as post type fuse holdersthe member of insulation being mounted forwardly of the contact that is connected to line.
Whereas the drawing and accompanying description have shown and described two preferred embodiments of the present invention, it should be apparent to those skilled in the art that various changes may be made in the form of the invention without affecting the scope thereof.
What I claim is:
1. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load side of said electric circuit, and
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contact as said terminal of said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal of said electric fuse is telescoped into said recess,
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess.
2. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first contact as said terminal of said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal of said electric fuse is telescoped into said recess,
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
said housing supporting said contacts,
said housing having separable sections,
said first said contact being located within one of said sections,
said second contact being located within another of said sections, and
said insulating member being located inwardly of said one section of said housing.
3. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of said electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load" side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contact as said terminal of :said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal if said electric fuse is telescoped into said recess,
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
said first said contact being movably mounted within said housing, and
said forward face of said insulating member moving, in response to engagement by said terminal of said fuse before said first said contact moves appreciably.
4. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact. that is connectable to the load side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contact as said terminal of said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal of said electric fuse is telescoped into said recess,
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
a compressible element normally displacing said insulating member forwardly of said first said contact but being compressible to permit said insulating member to be moved rearwardly toward said first said contact.
5. A holder for electric fuses which comprises:
a housing with a reces therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
\said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contacts as said terminal of said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal of said electric fuse is telescoped into said recess.
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse 'holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
said first said contact having a recess therein, and
said insulating member being dimensioned to be telescoped into said recess in said first said contact.
6. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contacts as said terminal of said electric fuse is telescoped into said recess.
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal of said electric fuse is telescoped into said recess,
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
said insulating member being readily compressible,
said insulating member having an unstressed dimension that will enable it to keep said terminal of said electric fuse from engaging said first said contact but being adapted to have a compressed dimension that will enable it to permit said terminal of said electric fuse to engage said first said contact.
7. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contacts as said terminal of said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal of said electric fuse is telescoped into said recess.
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and snakes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
said first said contact being movably mounted within said housing, and
said forward face of said insulating member being movable relative to said first said contact,
said forward face of said insulating member initially responding to engagement by said terminal of said electric fuse to move relative to said first said contact and then subsequently said insulating member and said firs-t said cont-act moving relative to said housing.
8. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contacts as said terminal of said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal of said electric fuse is telescoped into said recess,
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
said insulating member being initially spaced from said first said contact by a spring, and
said spring responding to the force supplied to said insulating member by said electric fuse to yield and thereby permit said insulating member and said terminal of said electric fuse to move toward said first said contact.
9. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contacts as said terminal of said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first sai-d contact as said terminal of said electric fuse is telescoped into said recess,
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
said insulating member being annular in form and surrounding a forwardly-extending projection on said first said contact,
said insulating member having an unstressed dimension that will enable it to keep terminal of said electric fuse from engaging said forwardly extending projection on said first said contact but being adapted to have a compressed dimension that will enable it to permit said terminal of said electric fuse to engage said forwardly-extending projection on said first said contact.
10. A holder for electric fuses which comprises:
a housing with a recess therein dimensioned to receive one of the terminals of an electric fuse,
a contact that is disposed within said recess and that is connectable to the line side of an electric circuit,
said contact being disposed inwardly of said recess and said housing guiding said terminal of said electric fuse toward said contact whenever said terminal of said electric fuse is telescoped into said recess,
a second contact that is connectable to the load side of said electric circuit,
an insulating member that is disposed forwardly of the first said contact and that normally blocks engagement between said terminal of said electric fuse and said first said contacts as said terminal of said electric fuse is telescoped into said recess,
said insulating member having a forward face which is movable rearwardly relative to said first said contact by said terminal of said electric fuse and is disposed forwardly of said first said contact and which must be engaged by said terminal of said electric fuse before said terminal of said electric fuse can engage said first said contact as said terminal of said electric fuse is telescoped into said recess,
said forward face of said insulating member being movable rearwardly by said terminal of said electric fuse until said terminal engages and makes an electrical connection with said first said contact of said fuse holder and thus with said line side of said electric circuit as said terminal of said electric fuse is telescoped into said recess,
said first said contact being movably mounted within said housing, and
said insulating member being readily compressible,
said insulating member having an unstressed dimension that will enable it to keep said terminal of said electric fuse from engaging said first said contact but being adapted to have a compressed dimension that will enable it to permit said terminal of said electric fuse to engage said first said contact.
said insulating member initially responding to engagement by said terminal of said electric fuse to assume said compressed dimension and then subsequently said insulating member and said first said contact moving relative to said housing.
1,833,173 11/1931 Murray 200-153 Beck et al. 200118 Stender et al 200-118 Gilley 200153 Bulgin 200-129 X Urani 200-129 BERNARD A. GILHEANY, Primary Examiner. H. B. GILSON, Assistant Examiner.
US. Cl. X.R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US590370A US3417359A (en) | 1966-10-28 | 1966-10-28 | Protectors for electric circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US590370A US3417359A (en) | 1966-10-28 | 1966-10-28 | Protectors for electric circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3417359A true US3417359A (en) | 1968-12-17 |
Family
ID=24361976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US590370A Expired - Lifetime US3417359A (en) | 1966-10-28 | 1966-10-28 | Protectors for electric circuits |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3417359A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3518600A (en) * | 1969-02-04 | 1970-06-30 | Mc Graw Edison Co | Protector for electric circuits |
| US3651441A (en) * | 1969-12-01 | 1972-03-21 | Eprad Inc | Electrical junction box |
| US3710296A (en) * | 1970-11-04 | 1973-01-09 | Mc Graw Edison Co | Protector for electric circuits |
| EP0009349A1 (en) * | 1978-09-25 | 1980-04-02 | AMP INCORPORATED (a New Jersey corporation) | Electrical cartridge fuse connector |
| US4909761A (en) * | 1989-05-10 | 1990-03-20 | Gould, Inc. | In-line breakaway fuse holder |
| US5648749A (en) * | 1995-09-19 | 1997-07-15 | Lin; Kuang Ts'an | Cartridge fuse mounting structure |
| US6303857B1 (en) | 1998-10-19 | 2001-10-16 | D.O.T. Connectors, Inc. | Mast lighting system |
| US20040037084A1 (en) * | 1998-10-19 | 2004-02-26 | Ginsburg Thomas A. | Mast lighting system |
| USRE39093E1 (en) * | 1993-07-13 | 2006-05-09 | Duraline, A Division Of J.B. Nottingham Co., Inc. | Mast-type outdoor lighting system |
| US20080218304A1 (en) * | 2005-06-20 | 2008-09-11 | Littelfuse, Inc. | Water resistant in-line fuse holder |
| US8517768B2 (en) | 2011-08-11 | 2013-08-27 | Ideal Industries, Inc. | Breakaway fuse holder |
| US20160307720A1 (en) * | 2013-12-19 | 2016-10-20 | Delphi International Operations Luxembourg S.À R.L. | Sealed fuse holder |
| US20160322187A1 (en) * | 2013-12-19 | 2016-11-03 | Delphi International Operations Luxembourg S.À R.L. | Fuse holder |
| US20170018871A1 (en) * | 2015-07-14 | 2017-01-19 | Commscope Technologies Llc | Protective sleeve for weatherproofing boot for interface of cable to remote radio head |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1833173A (en) * | 1928-07-10 | 1931-11-24 | Metropolitan Device Corp | Circuit breaking apparatus |
| US2430206A (en) * | 1944-06-27 | 1947-11-04 | Westinghouse Electric Corp | Protective device |
| US2474600A (en) * | 1947-11-25 | 1949-06-28 | John L Stender | Shunt control unit |
| US3132224A (en) * | 1962-04-11 | 1964-05-05 | A F Bulgin & Co Ltd | Combined fuse holder and indicating lamp unit |
| US3168627A (en) * | 1962-03-07 | 1965-02-02 | Western Electric Co | Relay with positively driven contacts |
| US3356806A (en) * | 1965-10-11 | 1967-12-05 | Mc Graw Edison Co | Protectors for electric circuit |
-
1966
- 1966-10-28 US US590370A patent/US3417359A/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1833173A (en) * | 1928-07-10 | 1931-11-24 | Metropolitan Device Corp | Circuit breaking apparatus |
| US2430206A (en) * | 1944-06-27 | 1947-11-04 | Westinghouse Electric Corp | Protective device |
| US2474600A (en) * | 1947-11-25 | 1949-06-28 | John L Stender | Shunt control unit |
| US3168627A (en) * | 1962-03-07 | 1965-02-02 | Western Electric Co | Relay with positively driven contacts |
| US3132224A (en) * | 1962-04-11 | 1964-05-05 | A F Bulgin & Co Ltd | Combined fuse holder and indicating lamp unit |
| US3356806A (en) * | 1965-10-11 | 1967-12-05 | Mc Graw Edison Co | Protectors for electric circuit |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3518600A (en) * | 1969-02-04 | 1970-06-30 | Mc Graw Edison Co | Protector for electric circuits |
| US3753192A (en) * | 1969-02-04 | 1973-08-14 | Mcgrow Edison Co | Protector for electric circuits |
| US3651441A (en) * | 1969-12-01 | 1972-03-21 | Eprad Inc | Electrical junction box |
| US3710296A (en) * | 1970-11-04 | 1973-01-09 | Mc Graw Edison Co | Protector for electric circuits |
| EP0009349A1 (en) * | 1978-09-25 | 1980-04-02 | AMP INCORPORATED (a New Jersey corporation) | Electrical cartridge fuse connector |
| US4202589A (en) * | 1978-09-25 | 1980-05-13 | Amp Incorporated | Fuse holder |
| US4909761A (en) * | 1989-05-10 | 1990-03-20 | Gould, Inc. | In-line breakaway fuse holder |
| USRE40228E1 (en) | 1993-07-13 | 2008-04-08 | Duraline, A Division Of J.B. Nottingham Co., Inc. | Mast-type outdoor lighting system |
| USRE39093E1 (en) * | 1993-07-13 | 2006-05-09 | Duraline, A Division Of J.B. Nottingham Co., Inc. | Mast-type outdoor lighting system |
| US5648749A (en) * | 1995-09-19 | 1997-07-15 | Lin; Kuang Ts'an | Cartridge fuse mounting structure |
| US6872883B2 (en) | 1998-10-19 | 2005-03-29 | Thomas A. Ginsburg | Mast lighting system |
| US20040037084A1 (en) * | 1998-10-19 | 2004-02-26 | Ginsburg Thomas A. | Mast lighting system |
| US6303857B1 (en) | 1998-10-19 | 2001-10-16 | D.O.T. Connectors, Inc. | Mast lighting system |
| US20080218304A1 (en) * | 2005-06-20 | 2008-09-11 | Littelfuse, Inc. | Water resistant in-line fuse holder |
| US20100164678A1 (en) * | 2005-06-20 | 2010-07-01 | Littelfuse, Inc. | Water resistant in-line fuse holder |
| US8009010B2 (en) * | 2005-06-20 | 2011-08-30 | Littlefuse, Inc. | Water resistant in-line fuse holder |
| US8517768B2 (en) | 2011-08-11 | 2013-08-27 | Ideal Industries, Inc. | Breakaway fuse holder |
| US20160307720A1 (en) * | 2013-12-19 | 2016-10-20 | Delphi International Operations Luxembourg S.À R.L. | Sealed fuse holder |
| US20160322187A1 (en) * | 2013-12-19 | 2016-11-03 | Delphi International Operations Luxembourg S.À R.L. | Fuse holder |
| US9728366B2 (en) * | 2013-12-19 | 2017-08-08 | Delphi International Operations Luxembourg, Sarl | Sealed fuse holder |
| US9818568B2 (en) * | 2013-12-19 | 2017-11-14 | Delphi International Operations Luxembourg S.A.R.L. | Fuse holder |
| US20170018871A1 (en) * | 2015-07-14 | 2017-01-19 | Commscope Technologies Llc | Protective sleeve for weatherproofing boot for interface of cable to remote radio head |
| US9608361B2 (en) * | 2015-07-14 | 2017-03-28 | Commscope Technologies Llc | Protective sleeve for weatherproofing boot for interface of cable to remote radio head |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: COOPER INDUSTRIES, INC., 1001 FANNIN, HOUSTON, TEX Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MCGRAW-EDISON COMPANY;REEL/FRAME:004510/0810 Effective date: 19860130 |