USRE23732E - Work holder - Google Patents

Description

Nov. 10, 1953 D. M. CLEVELAND 23,732

\ WORK HOLDER Original Filed March 26, 1948 Z06, IN V EN TOR.

0 0/10 M C/eye/afld Reissued Nov. 10, 1953 WORK HOLDER Donald M. Cleveland, Geneva, N. Y., assignor, by mesne assignments, to Sundstrand Machine Tool 00., Rockford, 111., a corporation of Illinois Original No. 2,593,538, dated April 22, 1952, Serial No. 17,300, March 26, 1948.

Application for reissue August 12, 1953, Serial No. 373,929

6 Claims. (01. 90-59) Matter enclosed in heavy brackets I: II appears in the original patent but forms no part oi this reissue specification; matter printed in italics indicates the additions made by reissue.

This invention relates to improvements in work holders.

An object of the invention is the provision of a simple and efficient work holder or support which will be positioned automatically in engagement with the work by the release of a clamping means, said means being employed for fixing the support in the adjusted position.

A further object of the invention is the provision of an efficient work holder or support in which a work-engaging member, is moved automatically into position with the work when a spring acting on the work-engaging member is released by a few turns on a nut, said nut being employed for fixing the work-engaging member in its automatically adjusted position, said member being shifted by a piston reciprocated in a barrel with cooperating means on the piston and barrel for preventing the piston from being discharged from the barrel.

The invention consists in the novel construction, arrangement and combinations of parts hereinafter more particularly described and claimed.

In the drawings:

Figure 1 is a plan view of one form of my support.

Figure 2 is a horizontal section of the support taken along the line 2-2 of Figure 3.

Figure 3 is a side view in elevation of the support shown in operative relation with a piece of work.

Figure 4 is a vertical section taken along the line 44 of Figure 2.

Figure 5 is a fragmentary view in elevation of an extension which is applied to the support.

Figure 6 is a fragmentary view in elevation and partly in section showing a modified form of a work engaging member, and

Figure 7 is a horizontal section of another form of the support.

Referring more particularly to Figures 1 to 4 inclusive, In designates a base member adapted to be attached to or mounted on a surface or a fixture of a milling or a vertical boring machine or other machines in which it is necessary to employ a support under the work to prevent the work from springing away from the tools. A post or housing formed integrally with the base has a vertical passage l2 extending through the post. The lower end of said passage is threaded to receive a plug l3. Said post is rectangular in cross section. The top of the post and in embracing relation with the passage I2 is provided with a. countersunk recess M for the 2 reception of a steel washer l5 and a felt washer it. A plate or cap I! is secured to the top of the post and has a central passage in alignment with the passage I2. These washers have a flat side to fit the flat side 2| of the piston or bar.

A piston or bar 20 is mounted for vertical sliding movement in post II. A flat portion 2| extends for a portion of the length of the piston. Said fiat portion has a taper of .005 of an inch for each inch of length. This taper counteracts any tendency for the piston to slip when a pull is exerted thereon. A stop flange 22 at the lower end of the piston prevents the piston from being discharged from the passage 12. A stud 23 is threaded into a pocket in the upper end of the piston and is used for applying work engaging members to said piston. The outer end of the stud is provided with a socket 23a adapted to be engaged by a suitable tool for turning the stud. A coil spring 24 is located in the passage I2 between the lower end of the piston 20 and the plug 3 and tends to force the piston upwardly at all times in the post.

A wedge 25 in the shape of a round rod is mounted in a passage 26 located transversely of the post Said passage opens into the vertical passage l2 so that a fiat portion 21 of the wedge will be in engagement with the fiat portion 2| of the piston 20.

It will be noted from Figure 2 that an edge of the fiat portion 21 of the Wedge 25 will be contacted by the flange 22 on the lower end of the piston 20 and will prevent the spring 24 from ejecting the piston from the passage I 2. A hexagonal nut 30 is threaded into the outer projecting end of the wedge 25 for drawing said wedge up tight on the piston 20. The not may be rotated by the usual wrench or by an Allen wrench which is applied to a socket 3|.

A knurled connector 33 has a threaded socket 34 to receive the projecting end of the stud 23. A pin 35 extends upwardly from the connector and is received by a passage 35 in a saddle 31 provided with a V'-shaped notch 38. The notch is particularly adapted to receive a piece of work 39 which is circular in cross section.

In Figure 5 is shown an extension 4|! which may be applied to the stud 23 and which is employed to support work at a higher elevation. A' second threaded stud 4| projects vertically from the upper end of the extension. A knurled cap 42 is mounted on said stud.

In Figure 6, another form of work-engaging member is disclosed for used with flat work. The threaded stud 23 or the piston 20 receives a connector 43 which has a universal socket 44 receiving a ball 45. A shank 46 rises from the ball and ca'rriesfa "plate 41 for supporting the work. H

In Figure 7 is shown a modified form or wedge or clamping element and the associated piston. All the other elements, however, are identical in construction *with similarly placed elements'illustrated in Figures 1 to 4 inclusive and therefore the same reference numerals will be applied. In this form, the clamping element =or 'rdd 50 is circular in cross section and has an arcuately shaped notch 5|, receiving the .piston 20a. The lower end of said piston is provided with a circular flange 52 which will be engaged by the member 50 to prevent accidental ejectionpf the piston by the spring. The nut 30 drawnsthe member 50 up tight on'the piston for fixing the piston in position against the tension of the spring.

Theoperation of the support and "its applicationto a piece of workis simple. After-the base has been applied-suitably to a machine-and afterthe piston or-20a has-beendepressed and .secured in place by the member or 50, the

proper work-engaging -memberis-applied to the upper end ofthe piston. With the work in place, the nut i'sre'leasedto permit the spring 24 to raise-the piston'and position the work-engaging member in-contact with the work. The nut 30 is-then' drawn up taut for-retaining the piston in its elevatedposition.

After the-operations on the work have been completed, the nut 30 is released. Downward pressure on the work-en'gaging'member will lowerthepiston after which the nut 30 is drawn up taut 'for-holding'thepiston in an inoperative position.

The -washer IS in co-operation with the felt washer *lBprevents filing or other fine metaliparticles from reaching the interior of the hollow post I. Theplate l1 maintains-the washers in place when the piston 20 is reciprocated inthe passage 12in thepost.

No washersare employed in=Figure 7 inconnection with the piston 20a. Said piston may bemachined to provide a close fi-tin the passage [-2 so that metal particles cannotenter the passage.

What I claim is:

L-Awork support comprising apost havinga longitudinal bore extending through one end of the post, a substantially vertical reciprocatory barm'ounted-withinthebore of the: post and having one-end-exposed beyond said end of the post, work engaging means carried by said one end 01' the 'bar, a spring mounted within the bore of the/postand engaging the otherend of said bar and urging said bar out of said oneend of the post, theupright post being provided with atranverse bore 'intersecting the-bore of the post, a transverse locking rod slidably mounted within thetransverse bore of thepost and extending laterally beyond oppositesides of thebar, the locking rodbeing provided inits side with a recess receiving the bar-and defining a clamping surface, one endof the locking rod extending laterally'outwardly beyond one side of the .post and beingscrew-threaded, and a nut mounted upon the screw-threaded end of the locking rod and tuinable -for drawing the locking rod axially in a direction to clamp the barbetween'the clamping "surface of therecessand the bore of the EportII WSt. v

in eombinationia-pcst having a longitudinal bore extending through one end thereof, a reciprocatory bar slidably mounted in the bore and bar outwardly of said one end of the post, said barbeing formed in its side with a longitudinally I extending flat face arranged at an angle to the longitudinal axis of the bar and diverging toward-said one'end of the bar, the post being formed with' 'a transverse [bar] bore intersecting the longitudinal bore of the post, a locking rod slidably mounted-in the transverse bore and extending crosswise 0f the reciprocatory bar, said locking rod being formed with a longitudinally extending flat face engaging the flat face of the bar, the flat face of -theiockingmod-being arranged at an-angle to ;the longitudinal axis of the locking rod, said rod'having a threaded end extending beyond the side of the post, and a nut threaded on said threaded-end of the-locking rod, said nut being rotatable on said threaded-(indie bear against .a portion on the postand movesaid plunger rod endwise in the transverse bore so as to wedge said bar between the longitudinal bore of the-post and the-flat face of the-locking rod and thereby lockthe bar-in .aselectedlomgitudinal position.

3. In combination, aipost havingua longitudinal bore extending through one end -there0f,=a reciprocatorg bar slidablg mounted 'inthe-boremnd having oneend exposed beyond-said one end-of theposta spring mounted-in said'bore andwngaging the other end of the=barand urging-said baroutwardly'of said one end-of the post, :said

bar being formedin its :side' with'a lmigitudinalig extending flatrfacenarrangednt an angle to the longitudinal aa'is of the' bar 'and'divergingtowat d said one 'end of th'e'ban 'the "postbeingiformed with a transverse bore intersecting the ilongi tudinul bore of the post, a locking rod sliddbly mounted in the transverse bore and mummy crosswise of the "reciprocatory' b'a 'r, said rod being formed with a longitudinally extending flat face engaging the fiat jace of the ban the flat face of the locking rod'being arrangedat an angle to the longitudinal axis of the lookingrod, and means for nicruing s'aid locking rod endwise in the transverse bore to 1 wedge -'saz'd bar =bet'ween the longitudinal bore of the post and "the iat face of the locking 'rod 'a nd thereby lolc the bar in a selected extended position.

4. A worlc suppor t comprising: an=uprtght post having a longitudinal bore extending through oneend of 'saidpost and a trdnsvers'e bore intersecting saidflongitudinal -'bore'; "an elongated var rnounted within said longitudinal bore andheumg one end e'rtendinfb'egond saidend "of the post, said one end being pro'uided'w'ith "a work engaging membe'n-a' spring mounted within the longitudinal bore and engaging the other' end a; said barnor'mallyto urge theba'r 'outwardlg'o! the post; a rod s'lida'bly within the transverse bore and ertending la'te'rallg'begondthe sides of the elongate'd bar; a pair offfl'atndacting wedging' surfaces, the first'wedging surface ljeing formed longitudinally ofsaid'ba'r and'at'an'ang'le to the amisof said bar-"divergingtowardsaid one end of the 'bar, and the second surface "being formed longitudinally of 'saia'rodandat anangle to the axis of 'said' 'rod 'so" that endwise movement of said r'o'cl toward said ba'r brings sum -"seconid surface tnto "engagement with said first surface to wedge said bar between the' second suffaee and the longitudinal bore of themost; an'd means for providing endwise movement of said rod to wedge said bar in a selected extended position.

5. A work support comprising: a housing having a longitudinal bore intersected by a transverse bore; an elongated bar mounted for reciprocable movement in said longitudinal bore and having an end provided with a work engaging member; first means urging said bar outwardly of the house; a rod slidably mounted in said transverse bore and intersecting said elongated bar; a pair of co-acting wedging surfaces, the first of said wedging surfaces being formed in a side of the bar at an angle diverging from the axis of said bar, and the second of said wedging surfaces being formed in a side of said rod at an angle diverging from the axis of said rod so that the surfaces may be brought into wedging engagement by endwise movement of said rod; and means for moving said rod endwise in the transverse bore to wedge said bar between the longitudinal bore of the housing and the second wedging swrface.

6. A work support comprising: an upright post having a longitudinal bore extending through one end of said post and a transverse bore interseating said longitudinal bore; an elongated bar mounted within said longitudinal bore and having an end extending beyond said end of the post, said end being provided with a work engaging member; a spring mounted within the longitudinal bore and engaging the other end of said bar normally to urge the bar outwardly of the post; a locking rod slidably mounted in said transverse bore of the post, said rod having a curved recess in its side defining a clamping surface adapted to engage the lateral surface of said bar; and means for moving said rod endwise in the transverse bore to draw said clamping surface tightly against said lateral surface to clamp said bar between the clamping surface and the post.

DONALD M. CLEVELAND.

References Cited in the file of this patent or the original lpatenlt UNITED STATES PATENTS Number Name Date 1,782,660 Meyer Nov. 25, 1930 1,890,423 Teagarden Dec. 6, 1932 2,243,905 Hubschneider June 3, 1941 2,424,090 Gardinier July 15, 1947

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