Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS1741923 A
Publication typeGrant
Publication dateDec 31, 1929
Filing dateMar 14, 1929
Priority dateJan 31, 1928
Publication numberUS 1741923 A, US 1741923A, US-A-1741923, US1741923 A, US1741923A
InventorsJan Dohnal
Original AssigneeJan Dohnal
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Screw clamp
US 1741923 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Dec. 31, 1929. J. IDOHNAL 1,741,923

SCREW CLAMP Filed March 14, 1929 Patented Dec. 31, 1929 UNIT stares JAN IDOHNAL, F DOZBRIS, CZECHOSLOVAKIA SCREW CLAMP Application filed March 14, 1929, Serial No.

The invention relates to a screw clamp in which the arm that constitutes the bearing for the clamping screw is arranged as a lever, to which an adjustable forked arm, that is provided on the longer branch of the angle rail, is connected by means of a pivot on j which the lever with the clamping screw can rotate, the free, upper end of the lever being provided with teeth which prevent the forked arm from slipping on the angle rail when objects are clamped in the device. As it is necessary for certain classes of work to have the screw clamp standing in a vertical position the invention provides for a pin which is passed through the shorter branch of the angle rail and bent downwards on both ends so as to form a foot on which the screw clamp rests when standing in a vertical position.

In the accompanying drawing the invention is illustrated in one form by way of example in which Figure 1 is a side elevation of the screw clamp, Figure 2 a plan view of the same, Figure 3 is a front elevation of the forked and lever arms alone showing the connection between these two parts, and Figure 4 a screw clamp on a smaller scale standing up in a vertical position.

The forked arm 6 is guided on the longer branch of the angle rail a and connected with the lever c by means of the pivot (Z in such a manner that the lever can be rotated. The clamping screw 0 with the handle f on one end and a clamping jaw g on the other end is arranged in the lower end of the lever c in the usual manner. The clamping plate It is provided on the shorter branch of the angle rail a oppositethe clamping jaw g.

When any object is to be clamped between the clamping plate and the clamping in the screw clamp, the lever c rotates in the direction indicated by the arrow :0 on the pivot d until the clamping action is attained by means of turning the clampingscrew the lever c then takes up the pressure generated and transfers it, by rotating in the direction indicated by the arrow 3 as a counter pressure by means of the teeth on its upper end onto the rail a, so that the lever becomes firmly positioned and the forked arm cannot slip on the angle rail.

347,120. and. in Germany January 31, 1928.

The pin 2' which is firmly located in the shorter branch of the angle rail, is bent clownward on both ends so as to form a foot upon which the screw clamp may stand in the position as shown in Figure 4. The single parts of the device are to be preferably made of hardened steel, which is particularly advantageous for the surfaces between the lever c and the angle rail against premature wearing away of the material.

I claim:

1. A screw clamp, comprising, in combination, a lever arm connected so as to be rotatable, with an adjustable forked arm provided on the longer branch of the angle rail of a screw clamp, the free, upper end of the said lever being provided with teeth adapted to engage against the inner surface of said longer angle rail branch and to hold said adjustable forked arm firmly located in any r given position on said rail branch, said lever arm being provided with a clamping screw having a handle and a clamping jaw and means for holding said screw clamp standing in a vertical position, substantially as set forth.

2. A screw clamp, comprising, in combination, a lever arm connected, so as to be rotat able, with an adjustable forked arm provided on the longer branch of the angle rail of a screw clamp, the free, upper end of said lever being provided with teeth adapted to engage against the inner surface of said longer angle rail branch and to hold said adjustable forked arm firmly located in any given position on the said rail branch, said lever arm being provided with a clamping screw having a handle and a clamping jaw, a pin through the shorter branch of said angle rail, said pin being bent down on both ends to form a foot adapted to hold said screw clamp standing in a vertical position, substantially as described.

J AN DOHNAL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3441265 *Oct 28, 1966Apr 29, 1969Herman AlbertAdjustable clamp
US3914830 *Feb 8, 1974Oct 28, 1975Bolton Robert BenjaminTools having locking adjustments
US6123326 *Jul 15, 1998Sep 26, 2000Kleinbongartz & KaiserClamping tool
US8002772 *Aug 8, 2003Aug 23, 2011Kinamed, Inc.Non-imaging tracking tools and method for hip replacement surgery
US8267389 *Feb 27, 2008Sep 18, 2012Bessey Tool Gmbh & Co. KgDevice for applying pressure to a workpiece
US8313095 *Aug 6, 2008Nov 20, 2012Bessey Tool Gmbh & Co. KgDevice for applying pressure to a workpiece and clamping tool
US8439339 *Jan 17, 2008May 14, 2013Bessey Tool Gmbh & Co. KgClamp
US20080217830 *Feb 27, 2008Sep 11, 2008Bessey Tool Gmbh & Co. KgDevice for applying pressure to a workpiece
US20090025192 *Jan 17, 2008Jan 29, 2009Bessey Tool Gmbh & Co. KgClamp
US20090026681 *Aug 6, 2008Jan 29, 2009Bessey Tool Gmbh & Co. KgDevice for applying pressure to a workpiece and clamping tool
US20100156015 *Dec 4, 2009Jun 24, 2010Bessey Tool Gmbh & Co. KgClamp and process for the production of a clamp
Classifications
U.S. Classification269/171.5, 269/249
International ClassificationB25B5/10, B25B5/16, B25B5/00
Cooperative ClassificationB25B5/102, B25B5/16
European ClassificationB25B5/16, B25B5/10C