US2726693A

US2726693A - Fixture clamp with pivotally mounted actuating screw

Info

Publication number: US2726693A
Application number: US330427A
Authority: US
Inventors: John N Saxton
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-01-09
Filing date: 1953-01-09
Publication date: 1955-12-13
Anticipated expiration: 1972-12-13

Description

Dec. 13, 1955 J. SAXTQN 2,726,693

FIXTURE CLAMP WITH PIVOTALLY MOUNTED ACTUATING SCREW Filed Jan. 9, 1953 25 3 a. fi! "95B? 24 7/24,?!

mun/111mm mam/mmanna/11mm@ rim/N M SAXTON IN V EN TOR.

ATTOENE Y.

United States Patent FIXTURE CLAMP WITH PIVOTALLY MOUNTED ACTUATING SCREW John N. Saxton, El Monte, Calif.

Application January 9, 1953, Serial No. 330,427

2 Claims. (Cl. 144-290) The present invention relates to clamps of a type which may be secured to a foundation member, such as a work bench for the purpose of securing work during certain operations thereon.

In the aircraft industry it is sometimes necessary to rapidly and securely fasten down to a work bench parts to be welded, and the present invention permits a workman to secure the work firmly and still release the work rapidly when the weld is completed.

An object of the invention is the provision of a clamp which is efiicient in operation of few parts and generally superior to clamps presently known to the inventor.

A further object is the provision of a clamp so constituted as to be readily released from work, and when so released, to automatically move to a second position, remote from the work.

In the drawings:

Figure l is a fragmentary side elevation, partly in section of the improved clamp;

Figure 2 is a top plan view of the clamp shown in Figure 1;

Figure 3 is a fragmentary sectional view on the line 33 of Figure l; and

Figure 4 is a side elevation of the clamp shown in Figure l, the jaw being in moved position.

Referring now with particularity to the drawing, the clamp includes a jaw having a pair of members 1 and 2 in spaced apart parallel relationship, each member comprising two

arms

3 and 4 in substantially right angle relationship. In other words, each member is of bellcrank form. A pin 5 passes transversely between the arms 3, and carried on said pin, between the said arms,

' is a block 6. interposed between the members 1 and 2 at the bight portions thereof is a block 7, which is rotatably mounted upon a pin 8, secured to members 1 and 2. Arms 4 for members 1 and 2 are rotatably secured to a stand or support comprising a pair of substantially

parallel side plates

9 and 10 by means of apin 11 passed through said side plates and the said arms, there being a sleeve 12 interposed between the arms and carried on said pin 11. The

side plates

9 and 10 are provided with

base members

13 and 14 in substantially right angular relationship to the side plates and which base members may be secured to some foundation member by means of screws, bolts or the like, as indicated generally by 15. The

side plates

9 and 10 are substantially trapezoidal in form, which is to say, each side plate has two parallel sides 16 and 17, the side 17 having the greatest height, while a side 18 extends from the upper edge of side 16 at an angle to said side, and merges with a recessed portion 19 of a keeper 20. The keeper 20 takes the form of a segment of an annulus, with the recess 19 in each side plate facing forwardly, which is to say, facing toward the members 1 and 2.

To maintain spacing between the side plates, the said side plates are pinned at 21 and 22, there being sleeves interposed between the side plates and carried on the pms.

2,726,693 Patented Dec. 13,- 1955 For the purpose of swinging the clamp member, an elongated thrust screw 23 is provided, one end 24 of said thrust screw being received within the block 7, as shown in Figures 1 and 2, and held therein in any approved manner, while the opposite end of said screw is enlarged at 25, and provided with a handle 26. Carried on the threads of said screw is a nut 27 provided with aligned

side trunnions

28 and 29, the trunnions adapted to be received within the recesses 19 when the clamp is engaging work, as shown in Figure 1. However, the trunnions may be easily removed from the recesses 19 by moving the thrust screw in one direction to release the block 6 from the work. To move the clamp from work position and out of the way of the work, a coil spring 30 is provided. One end of said spring is secured to a transverse pin 31 interposed between the arms 4, with the opposite end of the spring secured to the pin 21. The tendency is, therefore, to at all times swing the jaw to the position shown in Figure 4.

The operation, uses and advantages of the invention just described are as follows:

The support or stand for the jaw of the clamp is adapted to be fastened to a work table or other suitable foundation, either by bolts, or screws, as indicated at 15, or by any type of clamping means which may engage the

portions

13 or 14. The work indicated at 32 may vary as to size, and it is assumed that said work is to be welded to some other object. Accordingly, the work 32 must be held securely to the foundation member. The operator judges the height of the work relative to the bench and then brings the block 6 into position over the work. The not 27 may be rotated upon the thrust screw 23, whereupon, the trunnions are passed over the curved keeper and into the recesses 19. Upon turning the handle 26 to I rotate the thrust screw, the block 6 is brought into eugagement with the work. Immediately upon completing an operation, the handle 26 may be counter-rotated to release the block 6 from the work, whereupon

trunnions

28 and 29 are released manually from the recesses 19 and the spring will automatically swing the jaw to the position shown in Figure 4.

It is intended that a large number of devices of the character of the invention should be fastened to a work bench so that operations might proceed rapidly on various work pieces.

I claim:

1. A clamp as disclosed, including: a stand having two spaced-apart parallel side plates of trapezoidal form, two edges of each of which merge with a top keeper portion of segmental arcuate form, a jaw having a pair of side members in spaced-apart, parallel relationship, each side member comprising two rigidly connected arms in substantially right angular relationship, one end of each side member being pivotally mounted between the side plates at a point below and forwardly of the concave sides of the arcuate keeper portions, a block rotatably mounted between the side members at the angle portion between the arms thereof, a thrust screw secured at its outermost end to the rotatable block, a nut provided with a pair of end trunnions carried on said thrust screw, each trunnion adapted to be detachably received in the keeper portions of the side plates, and a work engaging block rotatably carried between the side members of the jaw at the outer ends thereof.

2. A clamp as disclosed, including: a stand having two spaced-apart parallel side plates of trapezoidal form, two edges of each of which merge with a top keeper portion of segmental arcuate form, a jaw having a pair of side members in spaced-apart, parallel relationship, each side member comprising two rigidly connected arms in substantially right angular relationship, one end of each side member being pivotally mounted between the side plates the arcuate keeperportions; a block" rotatably mountedbetween the side members at the angle portion between the arms thereof, a thrust screw mounted at its outermost endlto the rotatable block,,a.nut providedjwitha gait of end; trunnions carried onv saidthrust: screw, each trnnniontadaptedtor be detachably received in the keeper 7 gortions ofi'theside, plates, a work engaging block rotatably carried' between theside members; of the, jaw at the outerends, thereof, and;means between the jaw andthe sideplatesior; normally urging then-jaw inonedirection.

to maintain the trunnions of the nut-in the keeper portions.- V

References Cited in the file of this patent UNITED STATES PATENTS 438,826 Randall Oct. 21, 1890' 682,785 Caldwell Sept. 17, 1901 1,490,063 Tower Apr. 8,v 1924 1,589,307 Svebilius, June 15', 1926' 2,523,293 Hagenbook Sept. 26, 1950 2,613,243

Frean Oct. 7, 1952