CA1151815A - Thread restorer - Google Patents
Thread restorerInfo
- Publication number
- CA1151815A CA1151815A CA000378899A CA378899A CA1151815A CA 1151815 A CA1151815 A CA 1151815A CA 000378899 A CA000378899 A CA 000378899A CA 378899 A CA378899 A CA 378899A CA 1151815 A CA1151815 A CA 1151815A
- Authority
- CA
- Canada
- Prior art keywords
- base
- jaw
- workpiece
- jaw member
- cutting tool
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
Abstract
ABSTRACT
A device for use in restoring threads on workpieces of various sizes and which includes first and second jaw members mounted on a base, one being slidable in a direction toward and away from the other and the other jaw being pivotally mounted on the base. The pivotally mounted jaw has means for mounting a thread restoring cutting tool thereon and lock means is provided for the second jaw member permitting adjustably positioning the cutting tool relative to the work-piece clampingly engaged between the jaw members.
A device for use in restoring threads on workpieces of various sizes and which includes first and second jaw members mounted on a base, one being slidable in a direction toward and away from the other and the other jaw being pivotally mounted on the base. The pivotally mounted jaw has means for mounting a thread restoring cutting tool thereon and lock means is provided for the second jaw member permitting adjustably positioning the cutting tool relative to the work-piece clampingly engaged between the jaw members.
Description
S:183~5 This invention relates to a tool ~or use in restoring threads on shafts, pipes or the like of various diameters.
Thread restoring tools are known and sometimes are referred to as a thread chaser. One known tool consists of a bar having hand grips at opposite ends thereof and between which are located a pair of jaw members, one being adjustably movable toward the other by a rotatable worm on the movable jaw mating with a toothed rack on the edge of the bar. The movable jaw has a notched article engaging face for pressing a pipe to be threaded ayainst a chaser of appropriate -thread pitch detachably secured to the other jaw. There is three-point contact with the article on which threads are being restored, one point being the cutting tool and the other two on the movable jaw.
One object of the present invention is to provide a thread restoring tool that uses an ordinary tap of a tap and die set as the cutting member to restore external threads.
Another object of the present invention is to provide a thread restoring tool wherein one jaw member is slidably mounted on a base and the other jaw member pivotally attached thereto and selectively adjustable to appropriately position the cutting tool relative to the workpiece.
Another object of the present invention is to provide a thread restoring tool having three-point contact with the workpiece, and wherein one of such points is the cutting member and the second one of which i~ closely adjacent to the cutting member. Preferably the second point is ahead of the cutting member with reference to the direction of relative movement o~
l~S~8~S
the tool and workpiece as such arrangement equalizes the pressure of the cutter on the workpiece.
Another ob]ect of the present invention is to provide a thread restoring tool wherein the workpiece is clamped between a pair of jaw members and wherein the cutting member and the second member adjacent the jaw ~ember provide two of three points of contact with the workpiece.
In keeping with the foregoing there is provided in accordance with the present invention a device for use in restoring threads on a workpiece comprising: (a) a base;
(b) a first jaw member slidably movable on said base; (c) means for adjustably moving said first jaw member on said base;
(d) a second jaw member pivotally mounted on said base and having means for mounting a thread restoring cutting tool thereon; and te) selectively adjustable lock means associated with said second jaw memberand said base for adjustably positioning the cutting tool relative to the workpiece clamp-ingly engaged between said jaw me~bers.
The invention is illustrated by way of example with reference to the accompanying drawings wherein:
Figure 1 is a side view of a thread ~estoring tool provided in accordance with the present invention for use on a small diameter workpiece;
Figure 2 is a top view of Figure l;
Figure 3 is a side view similar to Figure 1 showing the thread restoring tool being used on a larger diameter woxkpiece;
Figure 4 is a side view of a thread restorer of Figures 1, 2 and 3 modified for re~toring thread on relatively ~5~ S
large diameter workpieces;
Figure 5 is a partial sec-tion~l, side elevational view of the cutting tool holder of the device illustra-ted in Figure 4;
Figure 6 is a :right side elevational view oE Figure 5;
Figure 7 is an enlaryed side view of a stop bar arrangement shown in Figures 1 and 3;
Figure 8 is a view essentially along line 8-8 of Figure 7 illustrating the stop bar as seen from the left;
Figures 9 and 10 are respectively a front and side elevational view of the guide part of the tool; and Figure 11 is a left side elevational view of Figure 5.
Referring to the drawings, there is illustrated in Figures 1 and 2 a thread restoriny device provided in accord-ance with the present invention and which includes a tool bar or base member on which there is movably mounted respective first and second jaw members A and B and a work guide C.
The jaw assembly A is slidably mounted on the base member 1 and the jaw member B is pivotally attached to the base as by a pin 13A. The wor~ guide member C has a cylindrical outer end engageable with the workpiece providing one point of contact therewith and is pivotally attached to the base by pivot pin 28. The work guide C is also in contact with jaw member B.
The base mèmber consists of two flat bars 1 spaced apart from one another and welded to a nut 2 adjacent one end 5~815 ~hereof and are separated at the opposite end by one end of a rod 3 welded or otherwise rigidly secured -to the bars 1.
The jaw member A has a flat plate or bar 4 projecting upwardly from t.he base L and a portion 4A at right-angles thereto which .i.s slidable on the top of the pair of bars 1 providing the base. A shaft 5A, welded or otherwise secured to the slidably member at the junction of portions 4A and 4, projects downwardly be-tween the pair of bars 1 provid:ing the base and transverse thereto and mounted on the lower end thereof is a cross rod 5 slidably engageable with the lower edge of pair of bars 1. The rod 5A provides a guide during sliding movement of the jaw member A and -the cross rod 5 coun-terac-ts forces applied to the pla-te 4 when the latter is pressed against the workpiece 7.
Plates 4 and 4A are reinforced by a gusset member 4B
to which there is pivotally attached a pair of links 10. The slidable jaw member A has a second guide 8 projecting down-wardly between the pair of bars 1 and on the lower end of the guide 8 is a crossbar 8A slidable with the lower surface of the pair of bars. A pin 11 passes through the guide 8 above the pair of bars 1 and is spaced therefrom sufficiently so as to receive an end portion of the member 4A and rests on part 4A to retain the same in position. As will be seen more clearly from Figure 7, member 4A is notched partially inwardly from one end thereof to a depth designated 12 to receive -the guide 8.
A lever 9 is pivotally attached to the guide 8 by pivot pin 9A.
The lin:ks 10 are also pivotally attached to the lever 9.
Pivotal movement of lever 9 about pin 9A, by way of linkage 10, effects movement of member 4 toward and away from the workpiece 7 ~L~51E~5 , .
for respectively clamping and quick releasing the same. The pivot pins are appropriately positioned for providing an over-center to lock the movable jaw i.n an article gripping position.
A threaded rod 6 is threaded into nut 2 and when turned orces the stop bar or pla-te assembly 4 against the workpiece 7 by exerting pressure against the guide 8. Pin 11 re-tains guide 8 and stop bar 4 in position on the tool base provided by the pair of bars 1. The stop bar portion 4A being slotted at the end to a position designa-ted 12 allows the stop bar 4 to move away from the workpiece 7 when -the lever 9 is moved counterclockwise as viewed in Figures 1 and 7 Eor quick release of the workpiece while -the portion 4A remains below the pin 11.
Jaw member B is a tool holder pivotally attached to the base 1 by pin 13A and by way of a clamp 17 retains a cu-tting tool 16 that i.s an ordinary tap normally used to tap in-ternal threads in nuts or the like. The tool holder comprises a pair of side plates 13 connected by a cross plate 18 welded or otherwise suitably secured thereto and effectively defines an open channel~ Plates 19 are welded to the inner surfaces of the pair of members 13 and are spaced from the cross plate 18 to define a pair of channels in which there is slidably mounted leg 17A of the L-shaped bracket 17. The clamp is thus guided to slide up and down between the plate 18 and plates 19 of the holder 13. A bolt 20 passes through an aperture in the clamp 17 and is threaded into a rod 21 which passes through a pair of levers 22. The levers 22 are pivotally attached to a lever 25 by a pivot pin 24. The lower end of lever 25 is located between 1~5~815 the pair of members 1 and pivotally attached thereto by pivot pin 13A. The upper end of lever 25 is notched as indicated by reference numeral 40 to receive one of four rows o~ the toothed portion of -the tap 16. ~ plate 26 is secured to the holder 13 and abuts against an opposite side of the teeth on the cutter 16 pressing the same into the notch 40. A
pin 23 passes through the pair of members 13 and notches 23A
in the pair of members 22. Bolt 20 when turned into the threaded hole in rod 21 pulls the clamp 17 down onto the tap 16 and at the same time exerts pressure,by means of pins 23 and 2 through levers 22,pressing the stop 26 a~ainst the tap 16.
This action securely holds the tap 16 firmly in place in the notch 40 in the upper part of the lever 25. The clamp 17 is notched as at 17B to engage the tap. The notches prevent rotation of the tap when forces are applied thereto in the direction of arrows B and C when the device is used to restore threads.
The guide C is a T-shaped member (see Figures 9 and 10) and includes a cross piece 27A and a stem 27B projecting down-wardly therefrom. The lower end of the stem 27B ~its between the rails 1 and is pivotally attached thereto hy ~in 28.
Figure 1 illustrates the device when used to restore threads on a relatively small diameter workpiece. Rotation of screw 6 causes stop bar 4 to contact the workpiece and press the workpiece against the cutting edge of the tap 16 and the guide 27. Figure 3 illustrates the device when used on a larger diameter workpiece. It will be noted in Figure 3 that the distance between the cutting edge o~ the tap 16 and the guide 27 is greater with the larger diameter workpiece. This is made possible by having the tool holder 13 pivoted to th~
base 1, adjustment being effected by slidin~J collar 15 on the rod 3 which is fixedly secured to the base 1. The collar can be locked at any position on the rod 3 by a set screw 15A.
A link member 14 is pivotally a-ttached respectively at opposite ends to the tool holder 13 and the collar 15.
Figure 4 illustrates the device conver-ted to accommodate workpieces of relatively large diameter. In this embodiment the tool holder 13 is installed on the opposite side of the base 1 compared to that as illustrated in Figures 1 and 3.
The cutting edge of the -tap 16 is adjusted to the workpiece 7 while the workpiece rests on the guide 5. A strap 32 is wrapped partially around -the workpi.ece 7 and secured to clamp 17 by plate 31 held securely to a pair of threaded screws 33.
The opposite end of the strap is anchored to the guide 5 by a plate 29 secured by a pair of threaded screws 30. Rotation of screw 6 adjusts the strap 32 to the desired tightness around the workpiece. For quick release of the workpiece the lever 9 is pivoted so the free end thereof moves in a direction away from the base 1. The same action slackens strap 32 for fast resetting of the device on the workpiece in the embodiment illustrated in Figure 4.
In place of a regular tap the cutting tool can be replaced by a specially made unit or units to accommodate a large variety of thread sizes.
In the foregoing, the guide 27 is illustrated and ~L~5~8~S
described as being pivotally mounted on the base. Alternatively thereto, the guide can be otherwise mounted for suitable adjustment and movement relative to the base with means for locking the same in any suitable position relative to the cutting tool. In a simpler arrangement, the guide piece 27 can be omitted and the workpiece merely rest on the base 1.
Also, it will be obvious guide 27 and/or ithe article engaging surface of member 4 can be provided with friction reducing means for contact with a workpiece. The friction reducing means may be merely pads of Teflon~ or rollers or spherical balls in the surface projecting partially therefrom for rolling contact on the surface of the workpiece.
Thread restoring tools are known and sometimes are referred to as a thread chaser. One known tool consists of a bar having hand grips at opposite ends thereof and between which are located a pair of jaw members, one being adjustably movable toward the other by a rotatable worm on the movable jaw mating with a toothed rack on the edge of the bar. The movable jaw has a notched article engaging face for pressing a pipe to be threaded ayainst a chaser of appropriate -thread pitch detachably secured to the other jaw. There is three-point contact with the article on which threads are being restored, one point being the cutting tool and the other two on the movable jaw.
One object of the present invention is to provide a thread restoring tool that uses an ordinary tap of a tap and die set as the cutting member to restore external threads.
Another object of the present invention is to provide a thread restoring tool wherein one jaw member is slidably mounted on a base and the other jaw member pivotally attached thereto and selectively adjustable to appropriately position the cutting tool relative to the workpiece.
Another object of the present invention is to provide a thread restoring tool having three-point contact with the workpiece, and wherein one of such points is the cutting member and the second one of which i~ closely adjacent to the cutting member. Preferably the second point is ahead of the cutting member with reference to the direction of relative movement o~
l~S~8~S
the tool and workpiece as such arrangement equalizes the pressure of the cutter on the workpiece.
Another ob]ect of the present invention is to provide a thread restoring tool wherein the workpiece is clamped between a pair of jaw members and wherein the cutting member and the second member adjacent the jaw ~ember provide two of three points of contact with the workpiece.
In keeping with the foregoing there is provided in accordance with the present invention a device for use in restoring threads on a workpiece comprising: (a) a base;
(b) a first jaw member slidably movable on said base; (c) means for adjustably moving said first jaw member on said base;
(d) a second jaw member pivotally mounted on said base and having means for mounting a thread restoring cutting tool thereon; and te) selectively adjustable lock means associated with said second jaw memberand said base for adjustably positioning the cutting tool relative to the workpiece clamp-ingly engaged between said jaw me~bers.
The invention is illustrated by way of example with reference to the accompanying drawings wherein:
Figure 1 is a side view of a thread ~estoring tool provided in accordance with the present invention for use on a small diameter workpiece;
Figure 2 is a top view of Figure l;
Figure 3 is a side view similar to Figure 1 showing the thread restoring tool being used on a larger diameter woxkpiece;
Figure 4 is a side view of a thread restorer of Figures 1, 2 and 3 modified for re~toring thread on relatively ~5~ S
large diameter workpieces;
Figure 5 is a partial sec-tion~l, side elevational view of the cutting tool holder of the device illustra-ted in Figure 4;
Figure 6 is a :right side elevational view oE Figure 5;
Figure 7 is an enlaryed side view of a stop bar arrangement shown in Figures 1 and 3;
Figure 8 is a view essentially along line 8-8 of Figure 7 illustrating the stop bar as seen from the left;
Figures 9 and 10 are respectively a front and side elevational view of the guide part of the tool; and Figure 11 is a left side elevational view of Figure 5.
Referring to the drawings, there is illustrated in Figures 1 and 2 a thread restoriny device provided in accord-ance with the present invention and which includes a tool bar or base member on which there is movably mounted respective first and second jaw members A and B and a work guide C.
The jaw assembly A is slidably mounted on the base member 1 and the jaw member B is pivotally attached to the base as by a pin 13A. The wor~ guide member C has a cylindrical outer end engageable with the workpiece providing one point of contact therewith and is pivotally attached to the base by pivot pin 28. The work guide C is also in contact with jaw member B.
The base mèmber consists of two flat bars 1 spaced apart from one another and welded to a nut 2 adjacent one end 5~815 ~hereof and are separated at the opposite end by one end of a rod 3 welded or otherwise rigidly secured -to the bars 1.
The jaw member A has a flat plate or bar 4 projecting upwardly from t.he base L and a portion 4A at right-angles thereto which .i.s slidable on the top of the pair of bars 1 providing the base. A shaft 5A, welded or otherwise secured to the slidably member at the junction of portions 4A and 4, projects downwardly be-tween the pair of bars 1 provid:ing the base and transverse thereto and mounted on the lower end thereof is a cross rod 5 slidably engageable with the lower edge of pair of bars 1. The rod 5A provides a guide during sliding movement of the jaw member A and -the cross rod 5 coun-terac-ts forces applied to the pla-te 4 when the latter is pressed against the workpiece 7.
Plates 4 and 4A are reinforced by a gusset member 4B
to which there is pivotally attached a pair of links 10. The slidable jaw member A has a second guide 8 projecting down-wardly between the pair of bars 1 and on the lower end of the guide 8 is a crossbar 8A slidable with the lower surface of the pair of bars. A pin 11 passes through the guide 8 above the pair of bars 1 and is spaced therefrom sufficiently so as to receive an end portion of the member 4A and rests on part 4A to retain the same in position. As will be seen more clearly from Figure 7, member 4A is notched partially inwardly from one end thereof to a depth designated 12 to receive -the guide 8.
A lever 9 is pivotally attached to the guide 8 by pivot pin 9A.
The lin:ks 10 are also pivotally attached to the lever 9.
Pivotal movement of lever 9 about pin 9A, by way of linkage 10, effects movement of member 4 toward and away from the workpiece 7 ~L~51E~5 , .
for respectively clamping and quick releasing the same. The pivot pins are appropriately positioned for providing an over-center to lock the movable jaw i.n an article gripping position.
A threaded rod 6 is threaded into nut 2 and when turned orces the stop bar or pla-te assembly 4 against the workpiece 7 by exerting pressure against the guide 8. Pin 11 re-tains guide 8 and stop bar 4 in position on the tool base provided by the pair of bars 1. The stop bar portion 4A being slotted at the end to a position designa-ted 12 allows the stop bar 4 to move away from the workpiece 7 when -the lever 9 is moved counterclockwise as viewed in Figures 1 and 7 Eor quick release of the workpiece while -the portion 4A remains below the pin 11.
Jaw member B is a tool holder pivotally attached to the base 1 by pin 13A and by way of a clamp 17 retains a cu-tting tool 16 that i.s an ordinary tap normally used to tap in-ternal threads in nuts or the like. The tool holder comprises a pair of side plates 13 connected by a cross plate 18 welded or otherwise suitably secured thereto and effectively defines an open channel~ Plates 19 are welded to the inner surfaces of the pair of members 13 and are spaced from the cross plate 18 to define a pair of channels in which there is slidably mounted leg 17A of the L-shaped bracket 17. The clamp is thus guided to slide up and down between the plate 18 and plates 19 of the holder 13. A bolt 20 passes through an aperture in the clamp 17 and is threaded into a rod 21 which passes through a pair of levers 22. The levers 22 are pivotally attached to a lever 25 by a pivot pin 24. The lower end of lever 25 is located between 1~5~815 the pair of members 1 and pivotally attached thereto by pivot pin 13A. The upper end of lever 25 is notched as indicated by reference numeral 40 to receive one of four rows o~ the toothed portion of -the tap 16. ~ plate 26 is secured to the holder 13 and abuts against an opposite side of the teeth on the cutter 16 pressing the same into the notch 40. A
pin 23 passes through the pair of members 13 and notches 23A
in the pair of members 22. Bolt 20 when turned into the threaded hole in rod 21 pulls the clamp 17 down onto the tap 16 and at the same time exerts pressure,by means of pins 23 and 2 through levers 22,pressing the stop 26 a~ainst the tap 16.
This action securely holds the tap 16 firmly in place in the notch 40 in the upper part of the lever 25. The clamp 17 is notched as at 17B to engage the tap. The notches prevent rotation of the tap when forces are applied thereto in the direction of arrows B and C when the device is used to restore threads.
The guide C is a T-shaped member (see Figures 9 and 10) and includes a cross piece 27A and a stem 27B projecting down-wardly therefrom. The lower end of the stem 27B ~its between the rails 1 and is pivotally attached thereto hy ~in 28.
Figure 1 illustrates the device when used to restore threads on a relatively small diameter workpiece. Rotation of screw 6 causes stop bar 4 to contact the workpiece and press the workpiece against the cutting edge of the tap 16 and the guide 27. Figure 3 illustrates the device when used on a larger diameter workpiece. It will be noted in Figure 3 that the distance between the cutting edge o~ the tap 16 and the guide 27 is greater with the larger diameter workpiece. This is made possible by having the tool holder 13 pivoted to th~
base 1, adjustment being effected by slidin~J collar 15 on the rod 3 which is fixedly secured to the base 1. The collar can be locked at any position on the rod 3 by a set screw 15A.
A link member 14 is pivotally a-ttached respectively at opposite ends to the tool holder 13 and the collar 15.
Figure 4 illustrates the device conver-ted to accommodate workpieces of relatively large diameter. In this embodiment the tool holder 13 is installed on the opposite side of the base 1 compared to that as illustrated in Figures 1 and 3.
The cutting edge of the -tap 16 is adjusted to the workpiece 7 while the workpiece rests on the guide 5. A strap 32 is wrapped partially around -the workpi.ece 7 and secured to clamp 17 by plate 31 held securely to a pair of threaded screws 33.
The opposite end of the strap is anchored to the guide 5 by a plate 29 secured by a pair of threaded screws 30. Rotation of screw 6 adjusts the strap 32 to the desired tightness around the workpiece. For quick release of the workpiece the lever 9 is pivoted so the free end thereof moves in a direction away from the base 1. The same action slackens strap 32 for fast resetting of the device on the workpiece in the embodiment illustrated in Figure 4.
In place of a regular tap the cutting tool can be replaced by a specially made unit or units to accommodate a large variety of thread sizes.
In the foregoing, the guide 27 is illustrated and ~L~5~8~S
described as being pivotally mounted on the base. Alternatively thereto, the guide can be otherwise mounted for suitable adjustment and movement relative to the base with means for locking the same in any suitable position relative to the cutting tool. In a simpler arrangement, the guide piece 27 can be omitted and the workpiece merely rest on the base 1.
Also, it will be obvious guide 27 and/or ithe article engaging surface of member 4 can be provided with friction reducing means for contact with a workpiece. The friction reducing means may be merely pads of Teflon~ or rollers or spherical balls in the surface projecting partially therefrom for rolling contact on the surface of the workpiece.
Claims (8)
1. A device for use in restoring threads on a workpiece comprising:
(a) a base;
(b) a first jaw member slidably movable on said base;
(c) means for adjustably moving said first jaw member on said base;
(d) a second jaw member pivotally mounted on said base and having means for mounting a thread restoring cutting tool thereon; and (e) selectively adjustable lock means associated with said second jaw member and said base for adjustably positioning the cutting tool relative to the workpiece clampingly engaged between said jaw members.
(a) a base;
(b) a first jaw member slidably movable on said base;
(c) means for adjustably moving said first jaw member on said base;
(d) a second jaw member pivotally mounted on said base and having means for mounting a thread restoring cutting tool thereon; and (e) selectively adjustable lock means associated with said second jaw member and said base for adjustably positioning the cutting tool relative to the workpiece clampingly engaged between said jaw members.
2. A device as defined in claim 1 including guide means on said base for contact with the workpiece.
3. A device as defined in claim 2 wherein said guide means is movable relative to the base.
4. A device as defined in claim 3 wherein said guide means is pivotally mounted on said base.
5. A device as defined in claim 4 wherein said guide means is positioned on said base closely adjacent said second jaw member.
6. A device as defined in claim 1 wherein said first jaw includes a work engaging portion attached to means slidable on the base by way of an over-center lever and link means for quick release of a workpiece clampingly engaged between the jaw members.
7. A device as defined in claim 1 including a stop end means for anchoring the strap to respective ones of said first and second jaw members.
8. A device as defined in claim 1 wherein the thread restoring cutting tool is detachably mounted on said second jaw member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000378899A CA1151815A (en) | 1981-06-02 | 1981-06-02 | Thread restorer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000378899A CA1151815A (en) | 1981-06-02 | 1981-06-02 | Thread restorer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1151815A true CA1151815A (en) | 1983-08-16 |
Family
ID=4120127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000378899A Expired CA1151815A (en) | 1981-06-02 | 1981-06-02 | Thread restorer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1151815A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5060330A (en) * | 1987-10-19 | 1991-10-29 | Moshe Abraham | Screw-thread repair tool |
-
1981
- 1981-06-02 CA CA000378899A patent/CA1151815A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5060330A (en) * | 1987-10-19 | 1991-10-29 | Moshe Abraham | Screw-thread repair tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |