CA2136248A1 - Universal inspection workpiece holder - Google Patents
Universal inspection workpiece holderInfo
- Publication number
- CA2136248A1 CA2136248A1 CA002136248A CA2136248A CA2136248A1 CA 2136248 A1 CA2136248 A1 CA 2136248A1 CA 002136248 A CA002136248 A CA 002136248A CA 2136248 A CA2136248 A CA 2136248A CA 2136248 A1 CA2136248 A1 CA 2136248A1
- Authority
- CA
- Canada
- Prior art keywords
- aperture
- riser
- base
- pin
- cube
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/10—Auxiliary devices, e.g. bolsters, extension members
- B23Q3/103—Constructional elements used for constructing work holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B31/00—Hand tools for applying fasteners
- B25B31/005—Hand tools for applying fasteners for temporarily connecting sheets before or during assembly operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/06—Arrangements for positively actuating jaws
- B25B5/12—Arrangements for positively actuating jaws using toggle links
Abstract
A modular system for the support and positioning of a workpiece for use with a device such as an inspection system. The system includes a base having a plurality of exterior faces, at least some of which have an array of equally spaced holes forming a grid pattern. At least one riser is attached to the base cube by a fastener, which can be inserted into the riser by defeating an outwardly biased locking member at the inner end of the fastener, extending through said riser and into the holes of the base cube. The fastener is used to provide positive location and fastening of the risers to the base cube.
Functions of individual risers include support, clamping, datum point positioning and providing reference points.
Functions of individual risers include support, clamping, datum point positioning and providing reference points.
Description
~136248 UNIVERSAL INSPECTION WORKPIECE HOLDER
BACKGROUND OF THE INVENTION
1. Technical Field This invention relates generally to an ~paralus and method for holding workpieces during inspection or dime,~ional checking.
BACKGROUND OF THE INVENTION
1. Technical Field This invention relates generally to an ~paralus and method for holding workpieces during inspection or dime,~ional checking.
2. Discussion In the manufacturing environment, parts are manufactured to strict specifications. For quality control purposes, these parts are checked on a scheduled basis against a master part or a set of specifications. With the constant demand for continual improvement in the manufacturing processes and cost reduction, design tolerances and cost budgets are becoming more stringent. Dimensional control checks are normally performed on the parts using jig and fixture arrangements that support the parts in predetermined locations. Once the part is secured in this predetermined location, dimension checking can be achieved by a manual process, such as plug gages or datamytes or automated systems, like CMM machines. In either case, it is critical that the parts can be repeatedly placed in the same location.
In the past, specific holding devices were often constructed for each part. An array of fKed stanchions would be mounted to a base that would support a part. This method is very costly since the fixture can typically be used for only one part. The fixtures are large and bulky creating a serious storage problem.
Similarly, the parts have a limited life. When a major change is made to the part or the part is deleted, the fixture becomes ol~solete. To try and reduce this waste, several inven~ons have been pu,~osed to use the same base and supporting means, reducing the amount of waste when a part L~comes obsolete.
U.S. Pat. No. 5,026,033 to Roxy r~;s~l~ses this type of adjus~able alignment positio,)ers using a master base template. A series of threaded holes are used and single point attachments are inserted to support the piece.
Although this system is effective, lengthy setup times are required. Locations of the attachments must be predetermined and the repeAt~bility of the fixture must be checked and verified.
U.S. Pat. No. 4,968,012 to Haddad et al. discloses a modular workpiece having precisely drilled counter-bored holes forming a matrix for attaching stanchions thereto. The holes alternate in diameter between a larger diameter and a smaller diameter and use a combination of a round and diamond shape attaching means with precision bushings therein. This system is very costly due to the precision required when drilling the matrix in each face of the cube,the bushings, and manufacturing the pin assembly. Additionally, the tolerance stack-up inherent in this system adds an ~dditional burden when manufacturing.
This invention eliminates one or more of the above-described problems as well as provides a workpiece holding apparatus which is easier to manufacture, allows for quick setup, provides universal support means, and affords positive and repeatable location of a plurality of parts.
21362~8 SUMMARY OF THE INVENTION
An apparatus made in accor.Jancs with the teachings of the present s inventlon includes a hollow base cube with a plurality of ekterior faces, at least some of which have an array of equally spaced holes forming a ~rid ~Lerrl.
At least one riser is used for ~pt;l-y a device for suppoilir,~ the part.
Attachment means is used to provide positive location and fastening of the risers to the base cube. The attachment means includes a pin and at least one locking member located near the inner end of the pin. The locking melnlJer is normally biased in a radially outward direction but can be overcome by control means that allow the pin to pass through apertures in the riser base and holes in the base cube. The control means is thereafler released to return the lockingmember to its normally biased position to thereby lock the attachment means in place to fasten the risers to the base cube.
In a preferred embodiment, the riser has four apertures, the first of which is a four way locating hole, being strictly toleranced and circular in geometry.The second aperture is locale.l in a second corner diagonally opposed the first aperture and is in the form of a slot w~ its narrowest width sul,s~antially the same size as the first aperture. The third aperture is located at a third cornerof the base plate and has a circular geo,.,etly with a diameter greater than thediameter of the first aperture, and a fourth aperture located in a fourth comer diagonally opposite the third aperture has a circular geometry with a diameter j 2I362~8 greater than the diameter of the first aperture. The apertures are formed in radially notched slugs integrally cast into the riser.
Also, the pre~er,ed embodiment slugs are - fixedly placed in predetermined support wells of a sand mold to appro~mately align with the s hole array of the base cube. The slugs are then locked into place by forming them into the sand mold. The sand mold is inserted into a two-piece riser mold to support the slugs as molten material is poured into the two-piece mold.
Once the casting is set and cooled, it is released from the two-piece mold and the excess flash and burrs are removed. The riser base is then machined to o give the top and bottom of the riser base finished parallel surfaces to one another. The slugs are then precision bored so the axial center of each slug is parallel to each other and perpendicular to the bottom of the riser base.
BRIEF DESCRIPTION OF THE DRAWINGS
The various advantages of the pres~rlt invention will L~co,ne apparen~
to one skilled in the art upon rea~lin~ the following sre~ io" and by reference to the drawings in which:
FIG. 1 is a perspective view depicting the prefer, ed embodiment of the present invention illustrating exemplary risers, base cube, and sample parts;
FIG. 2 is a pe,~pecti~e view of the base cube illustrating ths templales, protective foot pads, inner ribs, weight reduction and lifting holes;
FIG. 3 is an exploded view of a riser illustrating the template, riser, and fastener;
FIG. 4 is a top view of the riser base illustrating the aperture configuration;
FIG. 5 is a top view of a sample riser mold illustrating the integral inserts and locating base for said inserts;
FIG. 6 is a cross-sectional view of the fastener, riser, and base, illustrating the Ufastened'' position; and FIG. 7 is a cross-sectiGnal view of the faslener illustrating how the balls lock the pin in place.
DESCRIPTION OF THE PREFERRED EMBODIMENT
It should be understood from the outset that while the present invention will be described primarily in connection with one sre~fic example, this s example is simply a best mode of currently practicing the invention and that other modificalions can be made to this specific example without ~lep~ ~ing from the spirit and scope of the invention.
Re~er,ing now to the drawings, Figure 1 shows the ,ureferred embodiment of the universal inspection workpiece holder. As shown, the base unit 10 is supporting several workr~ ~ces. In this case, a roof 12, rear quarterpanel 14, and front quarter panel 16 for an automobile are shown, being supported and posrtioned by a plurality of risers 18,20,22.
The risers 18,20,22 are attached to the base unit 10 by means of a fastener 24 positively located and secured through the risers 18,20,22 into a predetermined matrix of untaped or straight-walled holes 26 having an adequate distance from each other such that any size and shape workpiece can be positioned and supported by the afore",en~ioned risers 18,20,22.
In the preferred embodiment, holes 26 are arranged in each of the vertical faces 32 and in the horizontal top face 34 in a matrix where each hole is equally sp~ced 100 mm apart from any ~j^cent -hole. This spacing is provided as an example only and is not meant to limit the invention.
Preferrably, the holes in the risers 18,20,æ should have the same spacing arrangement or a multiple thereof.
~1362~8 Areas of the base unit 10 are cut out to form windows 30 in the work surface to reduce the weight of the overall system. The size, shape and number of the windows 30 will vary and be determined by the ske of the base unit 10, workpieces required, and applications of the invention. Smaller re-,~anyular S windows 28 are provided on each vertical sur~ace to allow a lifting machine such as a fork truck or aane to efficiently Iffl the system to l, ~lSpGl l. It is again under~too~l that the number and ,~lac~i"ei)t of nsers 18,20,22, workpieces 12,14,16, and weight reduction windows 28 are exe",plaly only.
The base unit 10 is a single intey, al casting that has a generally cubical configuration with rectangular machined faces. The base unit 10 ~.referably includes a plurality of vertical faces 32 and a top hori~ontal face 34. As shownin Figure 1 the base unit 10 is hollow.
Figure 2 shows an exploded view of te,l,plates 36 attached to the base unit 10. The templates 36 have cut outs 37 that are used to aid in placement of the risers. The templates 36, are the same size as faces of the base cube 10 or a portion thereof and are located and attached to the base unit 10 by dowel pins 38 inserted into holes 26 and corresponding holes in the templates 40. By using predesigned templates 36, the placement of risers 18,20,22 is greatly facilit~ted decreasing set-up time and inaeasing the repe~1~hi~ty factor.
The base unit 10 may ~ontain support ribs 42 inside the base unit 10 to increase structural strength. The support ribs 42 are cast into the base unit 10at predetermined locations inside the hollow portion of the base unit 10 and runhorizontally, vertically, or diagonally from one face of the cube to an opposingside or corner.
.
, Continuing with Figure 2 the base unit 10 has foot pads 58 located on each corner and along the sides of the h~r~olllal bottorn surface. The foot pads 58 are made of high sl-~n~, steel or other .,.dt~,ial resilient to impre~nalion of rorGi~" ."at~,;als. The foot pads 58 are f(astened to the base unn 10 to assist in ,-k~intai.~ing a bYel surface by r~sislin~ f~r~i~n ,.~t~,ial ;,,,~r~ynalion and reducing the area in ~o~ w;th the floor surface.
Tuming to Figure 3 a detail of riser 18 is depicted being ~lac~,ed to the base unit 10 located by ~emplale 36 and secured by a plurality of fasteners 24. Each riser 18 is an integrally cast member that inclurles a riser base 44 extension 46 and holding section 48. The riser 18 is provided for positively locating and supporting a given workpiece at a predetermined dimension and location with respect to the base unit 10.
The riser 18 shown in Figure 3 has a straight extension 46 in which the holding section 48 is spaced from the base unit 10 but relatively in the same orientation in the XY axis. The e~ension 46 can be straight angled or any other orientation or length depending on the desired lo~tion of the holding section 48 in relation to the riser base 44.
The holding section 48 can accept a clamp 60 pin 62 or other device used to secure a workpiece. The holding section 48 can be in various skes and shapes having drilled and ~Apped holes accepting the aforementioned securing devices.
Figure 4 shows a detailed picture of the four apertures 64,66,68,69, located in the riser base 44, one located at each of the four corners of the riser base 44 and perpendicular to the horizontal bottom surface of the riser base 44. As illustrated, the strict tolerancs apert~re 64 is located diagonally o~posite the slotted aperture 66, with the narrow dimension 70 of the slotted aperture 66 equal to the ~lian)eter of the strict tolerancs aperture 64. The length of the slot 72 is approximately double that of the narrow ~li"lension 70. The other twoS securin~ apertures 68,69 are lo~e~J ~Jiagonally or-l>osf~e each other and are slightly larger in ~lia"leter than the strict toleranos aperture 64.
Referring to Figure 5, an illuall~Gn of the riser mold, each aperture is formed by integrally castin~ a slug insert 52 into the riser base 44. Each insert is fixediy placed in predetermined support wells 53 which are formed into a sand mold 56. The insert 52 is approximately located in the sand mold 56 with a major portion of the insert 52 exter,ding beyond the sand mold 56. The part of the insert 52 extending beyond the sand mold 56 oo,1~ail~s a notched radial surface 54 and has a length yrealer than or equal to the amount desired to be incorporated in the riser base 44. The sand mold 56 is inserted in the two-piece riser mold 55 to hold the slug inserts 52 in position as molten materiaî is poured into the mold to form the riser casling 18. The notched radial surface 54 in the insert 52 crea~es a positive retenbon msans against tensile forces applied axially to the insert 52, e.g., by the fastener 24 whe the risers are inuse. Once the riser 18 is ~o,l"e-J, It is lele~se~ from the two-piece riser mold55 and excess molten Rash and overRow ",~te,ial is removed. ~he riser 18 is placed in a milling machine where the top 57 and bottom 59 of the riser base 44 are machined Rush to ths riser base 44 and parallel to each other. The riser holding section 48 top surface is then machined flush and parallel to the bottom surface of the riser base 44. The four inserts 52 are precision bored perpendicular to the riser base 44 and holding section 48 top surface to form apertures 64, 66, 68 and 69. Holes are also drilled and tapped on the top surface and all four sides as required of said holding section 48 to provide means for various securing devices. ln the pret6,red embodiment the inse,-ts s 52 are cf~,l,prised of a copper-bronze alloy narne,'y AMPCO 18.
Figure 6 is a cross sectional view of the fastener 24 as it is inserted through the riser base 44 and base un,t 10 and secured by tightening of both the wing nut 80 and locking ring 82. As shown here the fastener 24 is in the Ulocked ' pos tion. A spring 88 is in the unco" ,pressed state pulling the locking 0 rod 90 into the outer pin shell 76 forcing the lock balls 78 outwardly. The outer pin shell 76 has a strictly toleranced diameter for insertion into the riser base 44 and base cube 10 apertures. By depressing the release button 84 the spring 88 is compressed the locking rod 90 is pushed outwardly allowing bhe lock balls 78 to retract inwardly beco",i,)g flush with the outer pin shell 76 thereby allowing the fastener 24 to be inserted or removed from the riser base 44 or the base unit 10. The guide cha",~er 86 provides a lead edge which aids during insertion of the fastener 24 into a riser 44 or base unit 10.
As further shown in Figure 6 once the fastener 24 is securely locked into position into the riser base 44 and base unit 10 the wing nut 80 is rotabonally turned in a clockwise direction to screw tighten against the top face of the riser base 44. Once ~e wing nut 80 is tightened, the locking ring 82 is rotaliGnally turned on the same threads to prevent ~e wing nut 80 from backing off the tightened position against the riser base 44.
Figure 7 shows a more detailed example of the ball detent within the fastener 24. The outward rosition of the lock balls 78 secures the fastener 24 by wedging the lock balls 78 ag6il ~t the base unit charnfer 94 of the base unit10 and the outward taper 96 of the bcking rod ~0. The base unit c~ "~er 94 can~s the lock balls 78 against the outward taper 96 of the locking rod ~0 ~reatly reducing the force e~e,led directly on the hck balls 78 when the fastener 24 is under a removal load.
The present invention provides a universal base that will accept a multitude of supporting means that are ~dart~b'e to various parts. This allows the same supporting means to be used for more than one part, reducing the amount of waste when a part changes or becomes obsolete. The templates provide a means for quick setup by dictating which holes in the base cube array to use and showing the loc~tion of the risers, thereby making part changeovers quick and efficient.
. The pattern in the riser apertures 64, 66, 68 and 69 of the present invention eliminates the tolerance stack-up that is inherent in previous inventions by locating in four directions with the first aperture, locating in only two directions with ~e second slotted aperture, and fastening with the two remaining larger apertures. This inver~on a~so great~y re~uoes the cost of manufacturing by eliminating the requirement to precision machine sleeves, and pin assemblies.
Various other advantages and mo~l~cAtions will become apparent to one skilled in the art after having the benefit of studying the teachings of the specification, the drawings, and the following daims.
In the past, specific holding devices were often constructed for each part. An array of fKed stanchions would be mounted to a base that would support a part. This method is very costly since the fixture can typically be used for only one part. The fixtures are large and bulky creating a serious storage problem.
Similarly, the parts have a limited life. When a major change is made to the part or the part is deleted, the fixture becomes ol~solete. To try and reduce this waste, several inven~ons have been pu,~osed to use the same base and supporting means, reducing the amount of waste when a part L~comes obsolete.
U.S. Pat. No. 5,026,033 to Roxy r~;s~l~ses this type of adjus~able alignment positio,)ers using a master base template. A series of threaded holes are used and single point attachments are inserted to support the piece.
Although this system is effective, lengthy setup times are required. Locations of the attachments must be predetermined and the repeAt~bility of the fixture must be checked and verified.
U.S. Pat. No. 4,968,012 to Haddad et al. discloses a modular workpiece having precisely drilled counter-bored holes forming a matrix for attaching stanchions thereto. The holes alternate in diameter between a larger diameter and a smaller diameter and use a combination of a round and diamond shape attaching means with precision bushings therein. This system is very costly due to the precision required when drilling the matrix in each face of the cube,the bushings, and manufacturing the pin assembly. Additionally, the tolerance stack-up inherent in this system adds an ~dditional burden when manufacturing.
This invention eliminates one or more of the above-described problems as well as provides a workpiece holding apparatus which is easier to manufacture, allows for quick setup, provides universal support means, and affords positive and repeatable location of a plurality of parts.
21362~8 SUMMARY OF THE INVENTION
An apparatus made in accor.Jancs with the teachings of the present s inventlon includes a hollow base cube with a plurality of ekterior faces, at least some of which have an array of equally spaced holes forming a ~rid ~Lerrl.
At least one riser is used for ~pt;l-y a device for suppoilir,~ the part.
Attachment means is used to provide positive location and fastening of the risers to the base cube. The attachment means includes a pin and at least one locking member located near the inner end of the pin. The locking melnlJer is normally biased in a radially outward direction but can be overcome by control means that allow the pin to pass through apertures in the riser base and holes in the base cube. The control means is thereafler released to return the lockingmember to its normally biased position to thereby lock the attachment means in place to fasten the risers to the base cube.
In a preferred embodiment, the riser has four apertures, the first of which is a four way locating hole, being strictly toleranced and circular in geometry.The second aperture is locale.l in a second corner diagonally opposed the first aperture and is in the form of a slot w~ its narrowest width sul,s~antially the same size as the first aperture. The third aperture is located at a third cornerof the base plate and has a circular geo,.,etly with a diameter greater than thediameter of the first aperture, and a fourth aperture located in a fourth comer diagonally opposite the third aperture has a circular geometry with a diameter j 2I362~8 greater than the diameter of the first aperture. The apertures are formed in radially notched slugs integrally cast into the riser.
Also, the pre~er,ed embodiment slugs are - fixedly placed in predetermined support wells of a sand mold to appro~mately align with the s hole array of the base cube. The slugs are then locked into place by forming them into the sand mold. The sand mold is inserted into a two-piece riser mold to support the slugs as molten material is poured into the two-piece mold.
Once the casting is set and cooled, it is released from the two-piece mold and the excess flash and burrs are removed. The riser base is then machined to o give the top and bottom of the riser base finished parallel surfaces to one another. The slugs are then precision bored so the axial center of each slug is parallel to each other and perpendicular to the bottom of the riser base.
BRIEF DESCRIPTION OF THE DRAWINGS
The various advantages of the pres~rlt invention will L~co,ne apparen~
to one skilled in the art upon rea~lin~ the following sre~ io" and by reference to the drawings in which:
FIG. 1 is a perspective view depicting the prefer, ed embodiment of the present invention illustrating exemplary risers, base cube, and sample parts;
FIG. 2 is a pe,~pecti~e view of the base cube illustrating ths templales, protective foot pads, inner ribs, weight reduction and lifting holes;
FIG. 3 is an exploded view of a riser illustrating the template, riser, and fastener;
FIG. 4 is a top view of the riser base illustrating the aperture configuration;
FIG. 5 is a top view of a sample riser mold illustrating the integral inserts and locating base for said inserts;
FIG. 6 is a cross-sectional view of the fastener, riser, and base, illustrating the Ufastened'' position; and FIG. 7 is a cross-sectiGnal view of the faslener illustrating how the balls lock the pin in place.
DESCRIPTION OF THE PREFERRED EMBODIMENT
It should be understood from the outset that while the present invention will be described primarily in connection with one sre~fic example, this s example is simply a best mode of currently practicing the invention and that other modificalions can be made to this specific example without ~lep~ ~ing from the spirit and scope of the invention.
Re~er,ing now to the drawings, Figure 1 shows the ,ureferred embodiment of the universal inspection workpiece holder. As shown, the base unit 10 is supporting several workr~ ~ces. In this case, a roof 12, rear quarterpanel 14, and front quarter panel 16 for an automobile are shown, being supported and posrtioned by a plurality of risers 18,20,22.
The risers 18,20,22 are attached to the base unit 10 by means of a fastener 24 positively located and secured through the risers 18,20,22 into a predetermined matrix of untaped or straight-walled holes 26 having an adequate distance from each other such that any size and shape workpiece can be positioned and supported by the afore",en~ioned risers 18,20,22.
In the preferred embodiment, holes 26 are arranged in each of the vertical faces 32 and in the horizontal top face 34 in a matrix where each hole is equally sp~ced 100 mm apart from any ~j^cent -hole. This spacing is provided as an example only and is not meant to limit the invention.
Preferrably, the holes in the risers 18,20,æ should have the same spacing arrangement or a multiple thereof.
~1362~8 Areas of the base unit 10 are cut out to form windows 30 in the work surface to reduce the weight of the overall system. The size, shape and number of the windows 30 will vary and be determined by the ske of the base unit 10, workpieces required, and applications of the invention. Smaller re-,~anyular S windows 28 are provided on each vertical sur~ace to allow a lifting machine such as a fork truck or aane to efficiently Iffl the system to l, ~lSpGl l. It is again under~too~l that the number and ,~lac~i"ei)t of nsers 18,20,22, workpieces 12,14,16, and weight reduction windows 28 are exe",plaly only.
The base unit 10 is a single intey, al casting that has a generally cubical configuration with rectangular machined faces. The base unit 10 ~.referably includes a plurality of vertical faces 32 and a top hori~ontal face 34. As shownin Figure 1 the base unit 10 is hollow.
Figure 2 shows an exploded view of te,l,plates 36 attached to the base unit 10. The templates 36 have cut outs 37 that are used to aid in placement of the risers. The templates 36, are the same size as faces of the base cube 10 or a portion thereof and are located and attached to the base unit 10 by dowel pins 38 inserted into holes 26 and corresponding holes in the templates 40. By using predesigned templates 36, the placement of risers 18,20,22 is greatly facilit~ted decreasing set-up time and inaeasing the repe~1~hi~ty factor.
The base unit 10 may ~ontain support ribs 42 inside the base unit 10 to increase structural strength. The support ribs 42 are cast into the base unit 10at predetermined locations inside the hollow portion of the base unit 10 and runhorizontally, vertically, or diagonally from one face of the cube to an opposingside or corner.
.
, Continuing with Figure 2 the base unit 10 has foot pads 58 located on each corner and along the sides of the h~r~olllal bottorn surface. The foot pads 58 are made of high sl-~n~, steel or other .,.dt~,ial resilient to impre~nalion of rorGi~" ."at~,;als. The foot pads 58 are f(astened to the base unn 10 to assist in ,-k~intai.~ing a bYel surface by r~sislin~ f~r~i~n ,.~t~,ial ;,,,~r~ynalion and reducing the area in ~o~ w;th the floor surface.
Tuming to Figure 3 a detail of riser 18 is depicted being ~lac~,ed to the base unit 10 located by ~emplale 36 and secured by a plurality of fasteners 24. Each riser 18 is an integrally cast member that inclurles a riser base 44 extension 46 and holding section 48. The riser 18 is provided for positively locating and supporting a given workpiece at a predetermined dimension and location with respect to the base unit 10.
The riser 18 shown in Figure 3 has a straight extension 46 in which the holding section 48 is spaced from the base unit 10 but relatively in the same orientation in the XY axis. The e~ension 46 can be straight angled or any other orientation or length depending on the desired lo~tion of the holding section 48 in relation to the riser base 44.
The holding section 48 can accept a clamp 60 pin 62 or other device used to secure a workpiece. The holding section 48 can be in various skes and shapes having drilled and ~Apped holes accepting the aforementioned securing devices.
Figure 4 shows a detailed picture of the four apertures 64,66,68,69, located in the riser base 44, one located at each of the four corners of the riser base 44 and perpendicular to the horizontal bottom surface of the riser base 44. As illustrated, the strict tolerancs apert~re 64 is located diagonally o~posite the slotted aperture 66, with the narrow dimension 70 of the slotted aperture 66 equal to the ~lian)eter of the strict tolerancs aperture 64. The length of the slot 72 is approximately double that of the narrow ~li"lension 70. The other twoS securin~ apertures 68,69 are lo~e~J ~Jiagonally or-l>osf~e each other and are slightly larger in ~lia"leter than the strict toleranos aperture 64.
Referring to Figure 5, an illuall~Gn of the riser mold, each aperture is formed by integrally castin~ a slug insert 52 into the riser base 44. Each insert is fixediy placed in predetermined support wells 53 which are formed into a sand mold 56. The insert 52 is approximately located in the sand mold 56 with a major portion of the insert 52 exter,ding beyond the sand mold 56. The part of the insert 52 extending beyond the sand mold 56 oo,1~ail~s a notched radial surface 54 and has a length yrealer than or equal to the amount desired to be incorporated in the riser base 44. The sand mold 56 is inserted in the two-piece riser mold 55 to hold the slug inserts 52 in position as molten materiaî is poured into the mold to form the riser casling 18. The notched radial surface 54 in the insert 52 crea~es a positive retenbon msans against tensile forces applied axially to the insert 52, e.g., by the fastener 24 whe the risers are inuse. Once the riser 18 is ~o,l"e-J, It is lele~se~ from the two-piece riser mold55 and excess molten Rash and overRow ",~te,ial is removed. ~he riser 18 is placed in a milling machine where the top 57 and bottom 59 of the riser base 44 are machined Rush to ths riser base 44 and parallel to each other. The riser holding section 48 top surface is then machined flush and parallel to the bottom surface of the riser base 44. The four inserts 52 are precision bored perpendicular to the riser base 44 and holding section 48 top surface to form apertures 64, 66, 68 and 69. Holes are also drilled and tapped on the top surface and all four sides as required of said holding section 48 to provide means for various securing devices. ln the pret6,red embodiment the inse,-ts s 52 are cf~,l,prised of a copper-bronze alloy narne,'y AMPCO 18.
Figure 6 is a cross sectional view of the fastener 24 as it is inserted through the riser base 44 and base un,t 10 and secured by tightening of both the wing nut 80 and locking ring 82. As shown here the fastener 24 is in the Ulocked ' pos tion. A spring 88 is in the unco" ,pressed state pulling the locking 0 rod 90 into the outer pin shell 76 forcing the lock balls 78 outwardly. The outer pin shell 76 has a strictly toleranced diameter for insertion into the riser base 44 and base cube 10 apertures. By depressing the release button 84 the spring 88 is compressed the locking rod 90 is pushed outwardly allowing bhe lock balls 78 to retract inwardly beco",i,)g flush with the outer pin shell 76 thereby allowing the fastener 24 to be inserted or removed from the riser base 44 or the base unit 10. The guide cha",~er 86 provides a lead edge which aids during insertion of the fastener 24 into a riser 44 or base unit 10.
As further shown in Figure 6 once the fastener 24 is securely locked into position into the riser base 44 and base unit 10 the wing nut 80 is rotabonally turned in a clockwise direction to screw tighten against the top face of the riser base 44. Once ~e wing nut 80 is tightened, the locking ring 82 is rotaliGnally turned on the same threads to prevent ~e wing nut 80 from backing off the tightened position against the riser base 44.
Figure 7 shows a more detailed example of the ball detent within the fastener 24. The outward rosition of the lock balls 78 secures the fastener 24 by wedging the lock balls 78 ag6il ~t the base unit charnfer 94 of the base unit10 and the outward taper 96 of the bcking rod ~0. The base unit c~ "~er 94 can~s the lock balls 78 against the outward taper 96 of the locking rod ~0 ~reatly reducing the force e~e,led directly on the hck balls 78 when the fastener 24 is under a removal load.
The present invention provides a universal base that will accept a multitude of supporting means that are ~dart~b'e to various parts. This allows the same supporting means to be used for more than one part, reducing the amount of waste when a part changes or becomes obsolete. The templates provide a means for quick setup by dictating which holes in the base cube array to use and showing the loc~tion of the risers, thereby making part changeovers quick and efficient.
. The pattern in the riser apertures 64, 66, 68 and 69 of the present invention eliminates the tolerance stack-up that is inherent in previous inventions by locating in four directions with the first aperture, locating in only two directions with ~e second slotted aperture, and fastening with the two remaining larger apertures. This inver~on a~so great~y re~uoes the cost of manufacturing by eliminating the requirement to precision machine sleeves, and pin assemblies.
Various other advantages and mo~l~cAtions will become apparent to one skilled in the art after having the benefit of studying the teachings of the specification, the drawings, and the following daims.
Claims (15)
1. A system for holding and aligning a part, said system comprising:
a hollow base cube with a plurality of faces, at least some of the faces having an array of equally spaced holes forming a grid pattern;
at least one riser, said riser having a base containing apertures extending therethrough, an extension of a predetermined height with holding section thereon for accepting a device for aupporting a part;
fasteners for providing positive location and fastening of the riser to said base cube, each fastener including a pin with and inner an outer end, at least one locking member located near the inner end of the pin normally outwardly biased, control means for overcoming said biasing of said locking member, and an axially adjustable securing mechanism located near the outer end of the pin; and whereby each riser is positively located and fastened to the base cube by defeating said biasing of said locking member using said control means, inserting the fasteners through the apertures in the riser base and through the holes of the base cube, and releasing said control means returning the locking member to its normally biased position thereby locking the fasteners in place to fasten the risers to the base cube.
a hollow base cube with a plurality of faces, at least some of the faces having an array of equally spaced holes forming a grid pattern;
at least one riser, said riser having a base containing apertures extending therethrough, an extension of a predetermined height with holding section thereon for accepting a device for aupporting a part;
fasteners for providing positive location and fastening of the riser to said base cube, each fastener including a pin with and inner an outer end, at least one locking member located near the inner end of the pin normally outwardly biased, control means for overcoming said biasing of said locking member, and an axially adjustable securing mechanism located near the outer end of the pin; and whereby each riser is positively located and fastened to the base cube by defeating said biasing of said locking member using said control means, inserting the fasteners through the apertures in the riser base and through the holes of the base cube, and releasing said control means returning the locking member to its normally biased position thereby locking the fasteners in place to fasten the risers to the base cube.
2. The system of claim 1 wherein:
the holes in the base cube are of equal size; and said apertures are located in each corner of the riser base plate perpendicular thereto, a first aperture being located in a first comer and being circular with a toleranced diameter, a second aperture being located in a second comer diagonally opposite the first aperture and being in the form of a slot with its narrowest width substantially the same see as the first aperture, a third aperture being being at a third comer of the base plate and having a circular geometry with a diameter greater than the diameter of the first aperture, and a fourth aperture located in a fourth corner diagonally opposite the third aperture and having a circular geometry with a diameter greater than the diameter of the first aperture, the slot having a major axis perpendicular to a plane that intersects the centers of the third and fourth apertures.
the holes in the base cube are of equal size; and said apertures are located in each corner of the riser base plate perpendicular thereto, a first aperture being located in a first comer and being circular with a toleranced diameter, a second aperture being located in a second comer diagonally opposite the first aperture and being in the form of a slot with its narrowest width substantially the same see as the first aperture, a third aperture being being at a third comer of the base plate and having a circular geometry with a diameter greater than the diameter of the first aperture, and a fourth aperture located in a fourth corner diagonally opposite the third aperture and having a circular geometry with a diameter greater than the diameter of the first aperture, the slot having a major axis perpendicular to a plane that intersects the centers of the third and fourth apertures.
3. The system of claim 1 wherein the locking member in the fastener comprises:
a pair of spherical ball bearings located in the pin, the balls being normally spring biased in the radially outwardly direction.
a pair of spherical ball bearings located in the pin, the balls being normally spring biased in the radially outwardly direction.
4. The system of claim 1 wherein the control means comprises:
a movable rod inside the pin, said rod having a section of reduced diameter inboard of an inner end of the rod, the outer circumference of the rod normally engaging the balls to bias them in the radially outwardly direction, the pin presenting its section of reduced diameter when the rod is moved in an axial direction to thereby permit the balls to move radially inwardly to release the fastener from the cube.
a movable rod inside the pin, said rod having a section of reduced diameter inboard of an inner end of the rod, the outer circumference of the rod normally engaging the balls to bias them in the radially outwardly direction, the pin presenting its section of reduced diameter when the rod is moved in an axial direction to thereby permit the balls to move radially inwardly to release the fastener from the cube.
5. The system of claim 1 wherein the outer end of the fastener has a section of larger threaded diameter than the inner and and wherein the fastener further comprises:
a wing nut threaded to mate with said pin's threaded outer section, having a top and bottom surface; and a lock nut threaded to mate with said pin threaded outer section.
a wing nut threaded to mate with said pin's threaded outer section, having a top and bottom surface; and a lock nut threaded to mate with said pin threaded outer section.
6. The system of claim 1 wherein the base cube is has a purality of vertical faces and a horizontal top face, each face containing a series of evenly spaced holes establishing an X-Y grid surface which matches said apertures in said risers.
7. The system of claim 1 wherein the bottom side of the base cube has a series of feet fastened to the cube comprised of a hardened material capable of withstanding impregnation of foreign material.
8. The system of claim 1 wherein inner sides of the base cube holes are chamfered.
9. A casted riser for supporting a part being fastened to a base cube comprising:
a base plate with a machined top and bottom surface and integrally casted slugs at predesignated locations each slug being precision bored to form apertures extending perpendicular to said top and bottom surface;
an extension section; and a holding section.
a base plate with a machined top and bottom surface and integrally casted slugs at predesignated locations each slug being precision bored to form apertures extending perpendicular to said top and bottom surface;
an extension section; and a holding section.
10. The riser of claim 9 wherein there are four slugs, each having an aperture, the first aperture being circular with a strictly toleranced diameter, the second aperture located diagonally opposed the first aperture and being a slot with a width substantially the same as the first aperture, the third aperture located at a third corner of the base plate having a circular geometry with a diameter greater than the diameter of the first aperture, and the fourth aperture being located diagonally opposite the third aperture having a circular geometry with a diameter greater than the diameter of the first aperture, the axis of the slot being perpendicular to a connecting line that intersects the center points of the third and fourth apertures.
11. The riser of claim 9 wherein each slug is axially restricted by means of a notch in said slug.
12. The riser of claim 9 wherein each slug is a copper alloy material.
13. A system for holding and aligning a part, said system comprising:
a hollow base cube with a plurality of vertical faces and a horizontal top face, each face having an array of evenly spaced straight-walled holes establishing an X-Y grid surface which matches apertures in risers used to support the part;
each riser having a attaching base containing four apertures in a base plate perpendicular thereto, the first aperture being circular with a toleranced diameter, a second aperture diagonally opposed the first aperture being a slot with a width substantially the same as the first aperture, a third aperture located at a third comer of the base plate having a circular geometry with a diameter greater than the diameter of the first aperture, and a fourth aperture located diagonally opposite the third aperture having a circular geometry with a diameter greater than the diameter of the first aperture, the axis of the slot being perpendicular to a connecting line that intersects the center points of the third and fourth apertures; an extension section of a predetermined height with an holding section thereon accepting a device for supporting the part;
a plurality of fasteners, each fastener including:
a) a pin with an inner and outer end, a pair of balls located in the pin, the balls being normally spring biased in a radially outwardly direction located near the inner end of the pin, a movable rod inside the pin, said rod having a section of reduced diameter inboard of an inner end of the rod, the outer circumference of the rod normally engaging the balls to bias them in the radially outwardly direction, the pin presenting its section of reduced diameter when the rod is moved in an axial direction to thereby permit the balls to move radially inwardly to release the fastener from the cube, said pin's outer end having a section of larger threaded diameter than the inner end;
b) a wing nut, threaded to mate with a threaded outer section of the pin, having a top and bottom surface machined to be perpendicular to axial movement along the pin; and c) a lock nut threaded to mate with said pin threaded outer section, having a bottom surface perpendicular to axial movement along the pin;
whereby each riser is positively located and fastened to the base cube by inserting the fasteners through the apertures in the riser base and through the holes of the base cube, with the balls thereafter biased in the radially outwardly direction to lock the fasteners in place to hold the risers to the base cube.
a hollow base cube with a plurality of vertical faces and a horizontal top face, each face having an array of evenly spaced straight-walled holes establishing an X-Y grid surface which matches apertures in risers used to support the part;
each riser having a attaching base containing four apertures in a base plate perpendicular thereto, the first aperture being circular with a toleranced diameter, a second aperture diagonally opposed the first aperture being a slot with a width substantially the same as the first aperture, a third aperture located at a third comer of the base plate having a circular geometry with a diameter greater than the diameter of the first aperture, and a fourth aperture located diagonally opposite the third aperture having a circular geometry with a diameter greater than the diameter of the first aperture, the axis of the slot being perpendicular to a connecting line that intersects the center points of the third and fourth apertures; an extension section of a predetermined height with an holding section thereon accepting a device for supporting the part;
a plurality of fasteners, each fastener including:
a) a pin with an inner and outer end, a pair of balls located in the pin, the balls being normally spring biased in a radially outwardly direction located near the inner end of the pin, a movable rod inside the pin, said rod having a section of reduced diameter inboard of an inner end of the rod, the outer circumference of the rod normally engaging the balls to bias them in the radially outwardly direction, the pin presenting its section of reduced diameter when the rod is moved in an axial direction to thereby permit the balls to move radially inwardly to release the fastener from the cube, said pin's outer end having a section of larger threaded diameter than the inner end;
b) a wing nut, threaded to mate with a threaded outer section of the pin, having a top and bottom surface machined to be perpendicular to axial movement along the pin; and c) a lock nut threaded to mate with said pin threaded outer section, having a bottom surface perpendicular to axial movement along the pin;
whereby each riser is positively located and fastened to the base cube by inserting the fasteners through the apertures in the riser base and through the holes of the base cube, with the balls thereafter biased in the radially outwardly direction to lock the fasteners in place to hold the risers to the base cube.
14. The system of claim 13 which further comprises:
a plurality of templates selectively mounted to the cube, each template being associated with a given part and having cutouts therein for locating the proper positioning of the risers on the cube for its associated part.
a plurality of templates selectively mounted to the cube, each template being associated with a given part and having cutouts therein for locating the proper positioning of the risers on the cube for its associated part.
15. A process for manufacturing a riser for holding a part, said process comprising:
placing a plurality of integral slugs fixedly in predetermined locations in a mold form;
generating a sand mold with the integral slugs protruding outwardly from a major surface of the sand mold;
inserting the sand mold with the integral slugs into a two-piece riser casting mold having a cavity defining a base for the riser, as well as a cavity for an extension section and holding section;
pouring a molten material into the cavities of the two-piece riser casting mold allowing the molten material to encapsulate the portion of the integral slugs extending into the base portion;
allowing the molten material to solidify to form a riser casting;
releasing the casting from the casting mold;
removing excess molten flash and overflow material;
machining top and bottom surfaces of the riser base;
boring the integral slugs perpendicular to the top and bottom surfaces; and drilling and taping holes in said holding section.
placing a plurality of integral slugs fixedly in predetermined locations in a mold form;
generating a sand mold with the integral slugs protruding outwardly from a major surface of the sand mold;
inserting the sand mold with the integral slugs into a two-piece riser casting mold having a cavity defining a base for the riser, as well as a cavity for an extension section and holding section;
pouring a molten material into the cavities of the two-piece riser casting mold allowing the molten material to encapsulate the portion of the integral slugs extending into the base portion;
allowing the molten material to solidify to form a riser casting;
releasing the casting from the casting mold;
removing excess molten flash and overflow material;
machining top and bottom surfaces of the riser base;
boring the integral slugs perpendicular to the top and bottom surfaces; and drilling and taping holes in said holding section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/156,313 US5481811A (en) | 1993-11-22 | 1993-11-22 | Universal inspection workpiece holder |
| US156,313 | 1993-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2136248A1 true CA2136248A1 (en) | 1995-05-23 |
Family
ID=22559045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002136248A Abandoned CA2136248A1 (en) | 1993-11-22 | 1994-11-21 | Universal inspection workpiece holder |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5481811A (en) |
| CA (1) | CA2136248A1 (en) |
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| US5991704A (en) * | 1998-03-26 | 1999-11-23 | Chrysler Corporation | Flexible support with indicator device |
| US6298572B1 (en) | 2000-01-10 | 2001-10-09 | Mcauley Brian | Universal holding device for effectuating three dimensional measurement of a part and method of constructing such a holding device |
| US6439561B1 (en) | 2000-06-28 | 2002-08-27 | Ultimate Standard Tooling International, Llc | Modular system and fixture for positioning a workpiece |
| US6364302B2 (en) | 2000-07-14 | 2002-04-02 | Ultimate Standard Tooling International Llc | Modular system and fixture for positioning and clamping a workpiece |
| JP4035329B2 (en) * | 2002-01-18 | 2008-01-23 | 本田技研工業株式会社 | Adjustment method of assembly jig |
| US7869057B2 (en) * | 2002-09-09 | 2011-01-11 | Zygo Corporation | Multiple-angle multiple-wavelength interferometer using high-NA imaging and spectral analysis |
| US7139081B2 (en) * | 2002-09-09 | 2006-11-21 | Zygo Corporation | Interferometry method for ellipsometry, reflectometry, and scatterometry measurements, including characterization of thin film structures |
| US7324214B2 (en) * | 2003-03-06 | 2008-01-29 | Zygo Corporation | Interferometer and method for measuring characteristics of optically unresolved surface features |
| US7106454B2 (en) * | 2003-03-06 | 2006-09-12 | Zygo Corporation | Profiling complex surface structures using scanning interferometry |
| US7292346B2 (en) * | 2003-09-15 | 2007-11-06 | Zygo Corporation | Triangulation methods and systems for profiling surfaces through a thin film coating |
| US20060012582A1 (en) * | 2004-07-15 | 2006-01-19 | De Lega Xavier C | Transparent film measurements |
| KR101006422B1 (en) * | 2005-01-20 | 2011-01-06 | 지고 코포레이션 | Interferometer for determining characteristics of an object surface |
| US7884947B2 (en) * | 2005-01-20 | 2011-02-08 | Zygo Corporation | Interferometry for determining characteristics of an object surface, with spatially coherent illumination |
| DE102005038407A1 (en) * | 2005-08-12 | 2007-02-15 | Ludwig Ehrhardt Gmbh | Clamping device and method for processing clamped on such a clamping workpieces |
| US7636168B2 (en) * | 2005-10-11 | 2009-12-22 | Zygo Corporation | Interferometry method and system including spectral decomposition |
| US7752755B2 (en) * | 2005-10-14 | 2010-07-13 | General Electric Company | Methods and apparatus for manufacturing components |
| WO2008011510A2 (en) * | 2006-07-21 | 2008-01-24 | Zygo Corporation | Compensation of systematic effects in low coherence interferometry |
| KR101519932B1 (en) * | 2006-12-22 | 2015-05-13 | 지고 코포레이션 | Apparatus and method for measuring characteristics of surface features |
| US7889355B2 (en) * | 2007-01-31 | 2011-02-15 | Zygo Corporation | Interferometry for lateral metrology |
| US7619746B2 (en) * | 2007-07-19 | 2009-11-17 | Zygo Corporation | Generating model signals for interferometry |
| US7722059B1 (en) | 2007-09-28 | 2010-05-25 | Marino Paul W | Complete wheel bracket assembly for a modular base assembly for vehicle model making |
| US8072611B2 (en) * | 2007-10-12 | 2011-12-06 | Zygo Corporation | Interferometric analysis of under-resolved features |
| JP5222954B2 (en) * | 2007-11-13 | 2013-06-26 | ザイゴ コーポレーション | Interferometer using polarization scan |
| US20090140111A1 (en) * | 2007-11-30 | 2009-06-04 | Marino Paul W | Actuator bracket for a modular base assembly for vehicle model making |
| EP2232195B1 (en) | 2007-12-14 | 2015-03-18 | Zygo Corporation | Analyzing surface structure using scanning interferometry |
| US8004688B2 (en) | 2008-11-26 | 2011-08-23 | Zygo Corporation | Scan error correction in low coherence scanning interferometry |
| US9329017B2 (en) * | 2012-03-20 | 2016-05-03 | Micro Motion, Inc. | Alignment tool |
| US9347759B2 (en) * | 2013-07-17 | 2016-05-24 | The Boeing Company | Method to fixture and inspection contoured aerodynamic surfaces |
| CN204461383U (en) * | 2015-01-05 | 2015-07-08 | 富泰华工业（深圳）有限公司 | Locating device |
| CN104816265A (en) * | 2015-04-24 | 2015-08-05 | 中信戴卡股份有限公司 | Clamp |
| CN106272656A (en) * | 2016-10-13 | 2017-01-04 | 扬州市邗江扬子汽车内饰件有限公司 | The fiberglass reinforced foamed instrument panel of a kind of fast changeable repaiies cut dress |
| US10933501B2 (en) * | 2017-10-18 | 2021-03-02 | Nyx, Inc. | Quick change modular gauge |
| EP3473975A1 (en) * | 2017-10-19 | 2019-04-24 | Renishaw PLC | Fixturing apparatus |
| CN109366391B (en) * | 2018-11-21 | 2023-10-31 | 重庆至信实业集团有限公司 | Side wall planking upper portion reinforcement mounting fixture |
| CN113911551B (en) * | 2021-09-29 | 2023-02-03 | 岚图汽车科技有限公司 | Frock is transported to sliding door motorcycle type side wall planking |
| TWI806294B (en) * | 2021-12-17 | 2023-06-21 | 財團法人工業技術研究院 | 3d measuring equipment and 3d measuring method |
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| CN115946059A (en) * | 2022-12-26 | 2023-04-11 | 江西洪都航空工业集团有限责任公司 | Processing and positioning method for sandwich foam composite material of airplane |
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| US3101641A (en) * | 1960-11-04 | 1963-08-27 | Carr Lane Mfg Co | Adjustable ball pin |
| US3381554A (en) * | 1967-06-30 | 1968-05-07 | Mcdonnell Aircraft Corp | Bushings for locating two adjaent parts |
| US4711437A (en) * | 1986-09-02 | 1987-12-08 | Te-Co. | Workpiece securing apparatus for a machine tool |
| US4968012A (en) * | 1989-05-10 | 1990-11-06 | Time Engineering, Inc. | Modular workpiece holding apparatus |
| US5026033A (en) * | 1989-11-22 | 1991-06-25 | The Budd Company | Universal system for the support and positioning of a workpiece |
| DE59207211D1 (en) * | 1991-11-15 | 1996-10-24 | Demmeler Maschinenbau | bolt |
-
1993
- 1993-11-22 US US08/156,313 patent/US5481811A/en not_active Expired - Fee Related
-
1994
- 1994-11-21 CA CA002136248A patent/CA2136248A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US5481811A (en) | 1996-01-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |