US2541772A - Stripper plate with lock nut - Google Patents

Description

Feb. 13, 1951 v, oc 2,541,772

STRIPPER PLATE WITH LOCK NUT Filed Dec. 8, 1949 7. 2!.L0eka7'd INVENTOR 1 1 BY 1 I Y I 1 ATTORNEYS Patented F eb. 13, 1951 UNITED STATES PATENT OFFICE STRIPPER PLATE WITH LOCK NUT Vene T. Lockard, Gladstone, Mich., assignor of one-half to Agnes M. Gerue, Escanaba, Mich.

Application December 8, 1949, Serial No. 131,879

. 3 Claims. 1

This invention relates to a stripper plate with a lock nut, designed primarily for use under the stripper plate on dies, although it is entirely possible that other uses of the nut may suggest themselves.

By way of background, it may be noted that in the die making art, it is well known that a decided inconvenience and annoyance stems from the inability of the die maker to lock stripper bolts from the face of the die, since many of these are located in the die where no wrench can be used. Additionally, conventionally shoulder bolts are used, this calling for expensive and exacting work, in that shoulders and counterbores for said bolts must be exact. As the die is ground down, the shoulder bolts must be shimmed down, as they become too long. Additionally, in the use of shoulder bolts, the bolt tends to work loose, in view of which the die must be removed from the press to tighten the bolts. Obviously, the expense of grinding rises considerably where a die must be dismantled to be ground. Additionally, all bolts and holes must be numbered, since all must be returned to their exact previous locations.

"In accordance with the present invention, it is proposed to use a specially designed lock nut under the stripper plates, by the use of which standard hollow head cap screws may be used as stripper bolts instead of the special expensive shoulder bolts.

It is further proposed, by the use of said lock nut, to allow the grinding of large dies without the necessity of dismantling the stripper plate with all its bolts, springs, etc.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings Fig. 1 is a fragmentary section taken through a stripper plate and die shoe showing the invention as used in the die.

Fig. 2 is a section taken substantially on line 2-2 of Fig. 1.

Fig. 3 is a fragmentary section taken through the stripper plate showing a modified arrangement.

Fig. 4 is a top plan view of a templet or drill jig embodied in the invention.

Fig. 5 is a side elevational view of said templet. Referring to the drawings in detail, 5 is a conventional die shoe, and 6 the conventional stripper plate used in association therewith.

Formed in the die shoe is the smooth-walled bolt hole I formed with the counterbore 8, and extending into said bolt hole 1 is the standard hollow head cap screw 9 formed with the head is seated in the counterbore 8. The shank of the cap screw 9 has the threaded end Ill threaded into the threaded opening H formed in the stripper plate 6 and threadable on said end IU of the bolt or cap screw 9 is the lock nut formed in accordance with the invention, the body of this nut being formed at one end with the shroud l2 and at the other end with the circumferential series of gear teeth 13.

For the purpose of rotating the lock nut, I provide the pinion rod M extending through the bearing opening 15 formed in the stripper plate 6, the portion of said pinion rod l4 that extends below the bearing opening being formed with the circumferential series of gear teeth l6 meshing with the gear teeth l3 of the lock nut. The lower end of said pinion rod M, as readily seen from Fig. 1, seats upon the shroud [2, so 'as to prevent the pinion rod Hi from moving downwardly through its bearing opening any more than is desired.

For the purpose of convenience in rotating the pinion rod M, the upper end of the pinion rod can be formed with a transverse opening in which is slidable the handle l1.

Referring now to the form of the invention illustrated in Fig. 3, the stripper plate is here designated l8, and is formed with the threaded opening l9 receiving the cap screw 9. In this form of the invention, there is no difference in the construction of the cap screw, lock nut, and pinion rods, and. the main difference resides in the provision of a pair of bearing openings 2| rather than a single bearing opening, so that two pinion rods M can be used, one extending downwardly through the stripper plate on either side of the threaded opening, and these engaging and meshing with the gear teeth of the lock nut at opposite sides of said lock nut. This provides extra locking power.

Referring no to Figs. 4 and 5, I have here illustrated a templet or drill jig used to properly locate the bearing opening I5 relative to the threaded opening I l of the stripper plate 6. This templet or drill jig is provided with an oblong body 22 adapted to rest upon the upper surface of the stripper plate 6, this oblong body being In use, the parts appear as in Fig. 1. As may be noted, the key or rod I4 is inserted. through. the bearing opening [5, engaging the gear teeth I1 is now rotated, and this v The stripper bolt 9 may now be tightened with a standard, wrench to.

I3. The handle loosens the lock nut.

bring the stripper plate down below the face of the die for grinding of said die.

After the die is ground, the stripper bolts may be; releasedenough to obtain the proper. adjustment of the stripper plate, after which the bolts are: locked. in; position by. tightening of the. lock nut with thewrench- [4..

It has been. found; that. the formation: and

relative arrangement of parts illustrated and described. will eliminate all the; difficulties noted at the. beginning; of this description.

What is. claimed is:

1. The: combination, witha stripper. plate and die. shoe, of a, cap screw extending through the die shoe-andthreaded in the; stripper plate, the.

stripper plate having a smooth-walled opening adjacent. said.- cap screw, a toothed lock nut.

threaded. on the cap screw below the stripper plate, and a. toothed, rod extending throughsaid.

opening of. the stripper plate andmeshing with the lock nutfor rotating, said lock, nut.

2; The combination, with a stripper plate hav-- ing a, threaded opening and a smoothopening, a. die shoespaced from thestripper plate and having a smooth. opening registering with the. threaded opening, and with a capscrew extend.- ing t'hroughthe smooth opening of.the die shoe. and threaded in the. threaded openingv of the. stripper plate, of alocknut threaded on the cap screw, and. disposed. between the. stripper plate.

and die. shoe, the lock nut having. one. side;

formed with a shroud constituting a wrench stop, the other side of said cap screw being formed with a circumferential series of gear teeth, and a pinion rod extending through the smooth opening of the stripper plate and having teeth meshing with the teeth of the lock nut, said pinion rod seating on the shroud.

3. The combination, with a stripper plate and die shoe. spaced apart, said stripper plate having a. threaded opening and a-smooth-walled opening adjacent said threaded opening, the die shoe having a counterbored smooth-walled opening, and with a capscrew seated in the counterbored opening of the die shoe and threaded in the threaded opening of. the stripper plate, of a circular lock nut threaded on the cap screw, one end of. said lock nut being formed with a circumferential series of gear teeth, the other end of said lock nut being formed with an annular shroud constituting a wrench stop, an elongated pinion rod extending; through the. smooth-.- walled. opening of. the stripper plate, that p,or-. tion of the pinioncrod, extending through. the; stripper plate being. formed with a circumferential series of spur gear teeth, and meansatthe;

other end. of, the. pinionrod for rotating. said pinion rod after. the. gear teeth of. the. rod. are

in mesh. With the. teeth of. the. lock. 111113,,Said, shroud constituting; a. stop for. the. first-named.

end. of thepinion rod.

VENE. T. LOCKARDL.

REFERENCES CITED The. following references are; ofv record: in-.th.e': file of. this. patent;

UNITED STATES PATENTS

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