US2137113A

US2137113A - Work clamp

Info

Publication number: US2137113A
Application number: US126562A
Authority: US
Inventors: John P Hobart; Edward C Krueger
Original assignee: Hammond Machinery Builders Inc
Current assignee: Hammond Machinery Builders Inc
Priority date: 1937-02-19
Filing date: 1937-02-19
Publication date: 1938-11-15
Anticipated expiration: 1955-11-15

Description

Nov. 15, 1938.

lI-L

II II J. P. HOBART ET AL WORK CLAMP F iled Feb. '19, 1937 ick/11111111111111!!! fanggrd 'f Krueyer,

THE/IPA 0 BY Patented Nov. 15, 1938 UNITE-l) STATES John P. Hobart, Kalamazoo, and: Edward {Cr Krueger, Otsego, Mich., assignors to'Han mond 5 Machinery Builders, Inc., Kalamazoo, .Mmh.,.a .comoration ofMichiganjjj r v ApplicationFebruary 19; l937g s erial 12 Claims. (ciao-#60) I This invention relates generally to work clamps" and'more particularly to work clamps for sawing andftriinming machines of the, type used by printers;

Themain'objects of our invention are: we

1st, tofprovide a work clamp that is simple and eifective in operation, which iseasy to ma; .nipulate, and positive in action. v 7 2nd, to provide improved means for detachably it? connecting the work clamp to the saw table.

' 3rd, to provide improved means in a work clamp view taken'on-the line 2'-2 of Figi 1. I

clamp in operative position.

25 Fig. 3 is a view in side elevation oithefwoi Fig. 4 'is a'transverse sectional view on line.

4 -4 of Fig. 1.

Fig. 5 is a transverse section on line 5-5 of Fig; 1.

' Fig. '7 is anenlarged view'in' end elevationfof theiwork engaging jaw.

Qur clamp is an improvement over clamps of the type disclosed in the patentsgto Walter. S.

Runnels, 582,307, dated April 27,1926, andto Cornelius Koets, 1,841,822'dated January 19, 1932.

=Referring'to'the drawing, l 'is a base having a longitudinal side wall 2 terminating in opposite .end wallstl and 4. This base isadapt'ed to rest on the table 5 of the sawing and trimming machine. The table 5'is provided with a hole 6 and an inclined edge slot 1, see Fig. 3. The base I of the clamp has a dependingportion. 8 overhangingthe table 5 adjacent the slot 1.- A stud 8 is threaded" through the-'base 'porti'on fl for longitudinal adjustment and'is adapted to enhole 6 in thetablei- The collar hasv an eccentric 1 opening. I3 in line with the bea'rin'g ll. Acam ,ll'iisiprovi ded with ash'ait l5'extending upwardly through the-opening 13 andbearing ll for rotary movement.- Secured" to the upper end'ohthe shaftfis affingerepi'ece' I6 forgtu'rning the cam t4 into and "outfof engagement with the bottom suriaceofthe'itable'5. 'The'cam is adapted to pass through the hole 6- when aligned; with the collaril't; *We thus provide. a veryieflicient and effective detachable connection between the clamp andthe table: The movement of the finger piece lfiis limited astop l'l' on the top of'theend wall 3. e e )Theend walls3and 4 of the base have aligned laterally openingtgrooves l8 offcirculardovetail cross "section for slideably supporting 'anf'elo'n-e gatedx'bar l9. se'cure'dito the. innerv side offan' elongated plate zThe longitudinal edges of theplatie 12.0 are flush withrthe upper, and. lower surfaces; of the endwallsofthe base. Awork ehgagingjaw 2| "is pivoted at 22 to the end of thebar-JQ; p

A block 23' is secured torthe barl'9 and. has a tongue 2 l jslideably co-acting with a longitudi nalslot 25 in the" side wall 2 of the base. Thus the block 23 -barfil9 andp'late .20 are slideable as the passage of a rod 29.. Thebo're26 in the. end i Fig. 6 is a transverse section on'line 6%6 of spring. 33 acting to resiliently'bias the rod 29 toward the plug 30. Thus the rod 29 is free to be moved longitudinally a to a 1 limited extent against the force of thecompression spring33.

On the rod-la-forslideable movement, is provided ayoke .M having a longitudinal bore. for

the passage ,oi the rod: A=wedgeq 35 is pivoted bore 38 into uniform clamping relation with the rod throughoutthe-lengthof the' yoke. This iska v'eryimportant feature of my invention. i The block 23 a nd;yoke 3.4- are'resiliently drawn toward each other by,means of a compression springja acting on-a screw member 39 threaded inthe gblock andfhaving-its head 40 in a bore 4|. in the yoke; seeFig. 2. This arrangement providesa very effectiveconnection between the yoke and theblocka:

.means of a link 46, the link being connected to the leverI-at 4!' and to the edge at 48. With the parts in the positionshown in Fig. 2, the jaw bar l9 may be adjusted longitudinally relative to the base I by pulling or pushing the hand lever 42 as desired. Thus the jaw 2| is moved into *engagement with the work, andthe hand lever is swung downwardly to a substantially horizontal position as shown by Fig. 3.

The initial movement of the hand lever causes the link 46 to turn the wedge 35 into locking engagement with the rod 29. Continued downward movement of the hand lever causes the connec-' tion 41 between the link and lever to be raised into a substantially horizontal position, as shown byKFig. 3, forcing the spring 33 to act through the parts on the work engaging jaw 2| to hold the; work in effectively clamped position. The work is released by merely touching the lever to break the toggle lockformed by the positioning of the centers 44, 41 and 48in substantially the same plane; r

From the above description of our work clamp it.will be apparent to those skilled in the art that-we provide one which is very effective and efficient, easy to mount and remove from the table, and simple to manipulate.

Weclaim: i

l. A clamp comprising a base having a longitudinal side wall terminating in opposite end walls, an elongated bar slideably engaging said end walls so that the parts are held in assembled relation with the bar freely moveable longitudinally relative to the base, a work' engaging'jaw on the end of said bar, a block secured to said bar, said end walls having aligned bores, a rod extendingthrough said boresfor limited longitudinal movement, spring means resisting longitudinal movement of said rod relative to the base, a yoke normally moveable relative to said rod, a wedge pivoted to said yoke and being normally out of "engagement with said rod, a hand lever pivoted to said block, a link connecting said lever tosaid wedge, spring means-between said block and lever acting to hold said lever, in its normal position, and spring means urging said block and yoke together; operative movement of said lever first causing said link to actuate said wedge into locking engagement with said rod and then forcing the yoke away from the block so that the action of the spring means on'the rod is transmitted to said work engaging jaw, the connection between the link and lever being also moved into the line of centers of the lever pivot and the con nection between the link and wedge whereby the force of the block-yoke spring means temporarily holds the parts in such position with the lever substantially horizontal.

2. A clamp comprising a spring biased rod, a jaw bar disposed in spaced parallel relation to said'rod, ablock fixed to said jaw'bar, a'hand lever pivoted to said block, means urging said hand lever toward upper inclined position, a yoke slideable on said rod, means acting to urge said block and yoke toward'each other, a wedge pivoted to said yoke above said rodintermediate of the length of the yokeand having a cammed surface for smoothly engaging said rod to lock the yoke in place thereon when the wedge is turned slightly, and link ineans connecting the hand lever to said wedge so that the latter is turned slightly when the hand lever is swung downwardly toward the horizontal, said last named spring acting to hold the parts temporarily in such position with the wedge, link and hand lever pivots in substantially the same plane.

3. A clamp comprising a base,'an elongated jaw bar moveably supported at the side of said base, a block fixed to said jaw bar, a hand lever pivoted to said block, means acting to elevate the free end of said hand lever, a yoke, a spring biased rod, a rod engaging wedge pivoted to said yoke to engage said rod'between the ends of the yoke, a

link connecting said hand lever to said wedge so 1 that when the hand lever is swung downwardly the wedge is turned to engage said bar and lock the yoke "and bar together, and spring means urging said block and yoke toward each other and acting to hold the parts in temporarily locked relation when the linkand hand lever are substantially inline with one another.

4. A clamp for usewith a table having an opening and an inclined edge slot, comprising a base adapted to rest onsaid table having a depending portion overhanging said table adjacent said slot, a stud threaded through said portion for longitudinal adjustment and adapted to engage said inclined slot-to hold one end of said base in place on the table, and a lock-nut onsaid stud for securing it in adjusted position, the basehaving a vertical bearing near the other end thereof, a conical collar secured to said base to fit within said hole in the table and having an eccentric opening in line with said bearing, a camhaving an eccentric shaft'extending upwardly through said opening and bearing. and a finger piece secured to the upper end of said shaft for turning said cam into and out of engagement with the bottom surface of said table, the cam being adaptedto pass through said hole when aligned with said collar.

5. A clamp for use with a table having an opening and an inclined edge slot, comprising a base adapted to rest on said table and having a depending means adapted to engage said inclined slot to hold one end of said base in place on the table, the base having a vertical bearing near the other end thereof, a conical collar :secured to said base to fit within said hole in the table and hav-' ing an eccentric opening in line with said hearing, a cam having an eccentric shaft extending upwardly through said opening and bearing, and a finger piece secured to the upper end of said shaft for turning said cam into and out of engagement with the bottom surface of said table, the cam being adapted to pass through said hole when aligned with said collar.

V 6. A clamp for use with a table having an opening, comprising a base adapted to rest on said table and having a vertical'bearing; a conical collar secured to said base to fit within said hole in thetable and having an eccentric opening in line with said bearing, a cam having an eccentric shaft extending upwardly through said openingand bearing, and means secured to said shaft for turning said cam into and out of engagement with the bottom surface of said table, the cam being adapted to pass through said 'opening when aligned with said collar.

'7. A clamp comprising a spring biased rod, 'a jaw bar arranged in spaced parallel relation to said rod, a hand lever pivoted to said jaw bar, a yoke normally slidable relative tov said rod and having a longitudinal bearing therefor, a wedge pivoted to said yoke midway of the ends thereof and having a curved surface adapted to quickly engage said rod and, draw the bottom half of said bearing into clamping relation with said rod throughout the length of the yoke, link means connecting said hand lever to said wedge to turn the latter. into, engagement with the rod when the hand lever is actuated tomove said yoke relative to said jaw bar, and means acting to hold said hand lever in position with'the rod connected through said yoke to said jaw bar.-

8. A clamp comprising'a rod, a block, a hand lever pivoted to said block, a yoke normally slidable relative to said rod and having a longitudinal bearing therefor, a wedge pivoted to said yoke between the ends thereof and having a curved surface adapted to quickly engage said rod and draw the bottom half of said bearing into clamping relation with said rod throughout the length of the yoke, means connecting said hand lever to said wedge to turn the latter into engagement with the rod when the hand lever is actuated to move said yoke relative to said block, and means acting to hold said hand lever in position with the rod connected-through said yoke to said block.

9. A clamp comprising a base'having end walls provided with aligned bores, a stop in the bore of one end wall, a rod extending through the bore in the other end wall and terminating-at said stop, a barrel secured tov said last named end wall, and a compression spring disposed in said barrel between the end thereof and the outer v out'the length of the yoke without marring the parts. l r

11. A clamp comprising a base, a rod slidably mounted in said base, means preventing movement of thevrod in one directiomspring means tending to prevent movement of the rod in the other direction, a jaw bar disposed for movement in substantial parallelism to said .rods movement, operating means mounted upon said jaw bar, agripping mechanism slidablyreceived upon the slidablymounted rod, and means coopis resiliently eratively associated between the operating means and ithe gripping mechanism whereby the-grip ping mechanism is rendered effective to grip and also the operating means and thegripping'means are moved apart for the purpose described.

12. A combination of elements as set forth in claim 11 in which the cooperatively associated means includes a toggle lever connection'gsaid toggle lever connection being movable to substan J tially straight line position during one phase of its movement.

' JOHN P. I-IOBART,

EDWARD C. KRUEGER. l