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Publication numberUS3071368 A
Publication typeGrant
Publication dateJan 1, 1963
Filing dateAug 8, 1960
Priority dateAug 8, 1960
Publication numberUS 3071368 A, US 3071368A, US-A-3071368, US3071368 A, US3071368A
InventorsBill Harding Emmit
Original AssigneeBill Harding Emmit
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Steplock rocker jaw parallel clamp
US 3071368 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Jan. 1, 1963 E. B. HARDING STEPLOCK ROCKER JAW PARALLEL CLAMP Filed Aug. 8, 1960 INVENTOR EMMIT BILL HARDING ATTORNEY 3,071,368 Patented Jan. 1, 1963 ice 3,071,368 STEPLOCK ROCKER JAW PARALLEL CLAMP Emmit Bill Harding, 41 W. 112th St, New York, NY. Filed Aug. 8, 1960, Ser. No. 48,082 1 Claim. (Cl. 269-215) This invention relates to clamping devices and, more particularly, to a screw threaded clamping device.

It is an object of the present invention to provide a screw threaded jaw type clamping device in which a pair of clamping pressure plates are movable in parallel relationship with each other into clamping engagement with a workpiece.

A further object of the present invention is to provide a parallel acting clamp device of the type described having ratchet type adjustment means for limiting the opening and closing of one end of the self aligning parallel jaw members.

All of the foregoing and still further objects and advantages of this invention will become apparent from a study of the following specification, taken in conjunction with the accompanying drawing, wherein:

FIGURE 1 is a perspective view of a rocker jaw parallel clamp assembly made in accordance with the present invention;

FIGURE 2 is a side elevational view of the device shown in FIGURE 1 in actual use;

FIGURE 3 is an enlarged fragmentary perspective view of the ratchet mechanism forming a part of the present invention; and

FIGURE 4 is a perspective view of a spring member forming a part of the ratchet assembly shown in FIGURE 3.

Referring now to the drawing, a steplock rocker jaw parallel clamp device made in accordance with the present invention is shown to include a base bar 12 having an upstanding column 14 at one end with a longitudinal slot 16 that slidably receives a cross pin 18 of a reaction bar 20. The adjacent end of the reaction bar 20 is provided with a ratchet member 22 that pivotally is secured thereupon by means of a cross shaft 23. The opposite end of the ratchet bar 22 is provided with a pawl 24 which releasably engages with a plurality of ratchet teeth 26 extending along the outermost edge of the upstanding column 14. An outwardly projecting detent 25 on the ratchet lever 22 serves to provide means for selectively pivoting such ratchet lever 22 during the operation of the device. A leaf type spring plate 27 is secured at one end to the reaction bar 20 and acts at its opposite end against the ratchet lever 22 to yieldably maintain the pawl 24 in locking engagement with the teeth 26, such spring 27 being overcome by an outward pull upon the detent 25 during the operation of the device.

The opposite free end of each of the base and reaction bars 12, 20 is provided with a pressure plate 32 having a web 28 pivotally mounted upon such free end of each of the bars 12, 20 by means of cross pins 30. These plates 32 are thus mounted for limited pivotal movement upon the respective supporting bars, so as to conform generally to the surface contour of the object 42 being clamped.

An operating shaft 34 is rotatably supported within a bearing 36 on the base bar 12 and has a threaded section 38 that is threadedly engaged with a central portion of the reaction bar 20. The opposite end of the shaft 34 is provided with an operating handle 40 for efiecting rotation thereof.

In actual use, the position of the ratchet end of the reaction bar 20 relative to the column end of the base bar 12 is initially adjusted by means of a ratchet lever 22 and cooperating pawl 24- and teeth 26 so as to conform generally to the thickness of an object to be clamped. With the column 14 thus maintaining the base and reaction bars 12, 20 in substantially a common plane, the object 42 may be placed between the pressure plates 32 and the handle 40 rotated to bring the pressure plates 32 into clamping engagement with the oppositely facing surfaces of the object 42. During such actuation of the handle 40, the clamping pressure is applied substantially uniformly to both sides of the object 42, thus effectively clamping it in place. For smaller objects, the detent 25 is urged outwardly to release the pawl 24 from the teeth 26 so as to lower the adjacent end of the reaction bar 20 relative to the base bar 12 to the desired extent.

While this invention has been described with particular reference to the construction shown in the drawing, it is to be understood that such is not to be construed as imparting limitations upon the invention, which is best defined by the claim appended hereto.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

A steplock rocker jaw parallel clamp assembly comprising, in combination, a base bar, a threaded shaft rotatably mounted on the base bar, a reaction bar threadedly carried by said shaft, a pressure pad pivotally connected to one end of each of said bars and corresponding to the one end of the other of said bars, a handle integral with the threaded shaft for rotating the shaft to adjust the distance between the said bars, said base bar having an upstanding cohunn integral with its other end, said column having a longitudinal slot and a set of ratchet teeth in one edge thereof, the reaction bar having a slot at its other end through which the upstanding column passes, a pin in the reaction bar extending through the slot in the upstanding column, and a ratchet lever pivotally connected to the other end of the reaction bar having a pawl releasably engaging said ratchet teeth for limiting movement of the reaction bar toward said base bar in response to rotation of the threaded shaft.

References Cited in the file of this patent UNITED STATES PATENTS 15,170 Chafliee June 24, 1856 95,772 Cook et a1. Oct. 12, 1869 1,347,360 Anthony July 20, 1920 1,839,951 Choinski Jan. 5, 1932 2,395,607 Aalberg Feb. 26, 1946 2,901,012 Crispin Aug. 25, 1959

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US15170 *Jun 24, 1856 Peters
US95772 *Oct 12, 1869Said PostImprovement in wood-vise
US1347360 *Dec 11, 1919Jul 20, 1920Alois AnthonyPortable clamp
US1839951 *Jan 1, 1931Jan 5, 1932Walter ChoinskiTire clamp
US2395607 *Dec 26, 1944Feb 26, 1946Aalberg Peder MClamp
US2901012 *May 21, 1956Aug 25, 1959Douglas Aircraft Co IncExpansion or contraction compensating clamp
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3575405 *Aug 28, 1968Apr 20, 1971Harding Emmit BParallel bar clamping device
US3850421 *Apr 23, 1973Nov 26, 1974Orris RClamp apparatus
US4049254 *Jul 13, 1976Sep 20, 1977Essilor International Cie Generale D'optiqueSupporting and positioning plate assembly for spectacle frames
US4120190 *Feb 14, 1977Oct 17, 1978Marvin Glass & AssociatesCraft device for decoratively deforming metal cans and the like
US4125252 *Apr 21, 1977Nov 14, 1978Jeumont-SchneiderPower semiconductor assembly and the method and apparatus for assembly thereof
US5192046 *May 29, 1991Mar 9, 1993Steelcase Inc.Processor support
US5767414 *Mar 5, 1997Jun 16, 1998Mitsubishi Semiconductor America, Inc.Automatically aligning tool for uniformly applying a controlled force to an object
US5968403 *Nov 14, 1997Oct 19, 1999Myers; Dallas E.Waler system and clamp for concrete wall forms
US5975483 *Jan 22, 1999Nov 2, 1999Paschal-Werk G. Maier GmbhClamp with clamping jaws and a carrier connecting them
US7011284 *Jun 14, 2002Mar 14, 2006Truck Accessories Group, Inc.Pivotable clamp
US8534656Mar 14, 2008Sep 17, 2013Simon MillsClamp arrangement
US20030230697 *Jun 14, 2002Dec 18, 2003Pace-Edwards CompanyPivotable clamp
US20040217610 *May 1, 2003Nov 4, 2004Hollman Bert D.Coil hook
US20070007702 *Jun 8, 2006Jan 11, 2007Bernhard BrandlDevice and arrangement for fixing workpieces
US20100109223 *Mar 14, 2008May 6, 2010Simon MillsClamp Arrangement
US20120302410 *Nov 29, 2012John KitchensPortable exercise devices and related methods
US20130074294 *Sep 23, 2011Mar 28, 2013James C. LynchAdjustable jaw table clamp
DE1270507B *Jan 12, 1966Jun 12, 1968Hulda Erna Mayer Geb MoosmannSpannzwinge
DE3621482A1 *Jun 26, 1986Jan 7, 1988Wolfgang BaumannClamp usable especially in the building trade
DE10318918A1 *Apr 23, 2003Nov 25, 2004Goroshanin, Genadi, Dipl.-Ing.Parting device for separating positively joined parts made of wood, has two fixed clamps joined together via rail rod or pipe, and guiding clamp movable along screw shaft coupled pivotally between fixed clamps
DE102007031915A1 *Jul 9, 2007Jan 15, 2009Hans-Joachim MausC-clamp has an elongated opening on the longitudinal line, with edge profiles to hold the locking bolt in a positive fit
WO2008113980A1 *Mar 14, 2008Sep 25, 2008Spectraconcepts LtdClamp arrangement
U.S. Classification269/215, 269/239, 269/245, 269/258, 269/218
International ClassificationB25B5/10, B25B5/00, B25B5/04
Cooperative ClassificationB25B5/101, B25B5/106, B25B5/04
European ClassificationB25B5/10B, B25B5/10E2, B25B5/04