US1319717A - A ssigltor to - Google Patents

Description

`F. G. MARBACH.

SCREW CLAMP APPLICATION flLED DEc.e,1917.

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Panted Got. 28, 1919.

ATTUENEYS NrnTTTnn sTnTns PATENT orricn.

FRANK e. MARBAGH, or CLEVELAND, OHIO, ssrenloit To wIrlrLIAM" Taos'rrnn, or

Y CLEVELAND, oHro.

SCREW-CLAMP'.

To all lw/z om t may conce/rn Beit known that l, FRANK G. MARBACH, citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certainnew and useful Improvements in Screw-Clamps, of which the following is a specification.

My invention pertains to an improvement in screw clamps, and the invention consists in the dual bearing for the screw and in other features thereof, substantial-ly as shown and described and particularly pointed out in the claims.

In. the accompanying drawings, Figure l is a front edge elevation of the clamp, andV Fig. 2 is a side elevation thereof with a portionv at thetop broken away. Fig. 3 is a cross section on line 3 3, Fig. 2. F ig. 4 is a. detail of the body of the clamp;4 Fig. 5 is a detail of the eye attachment for the nut and screw, and Fig. G is a detail of the nut. Fig. 7 is a detail of the dual bearing on the bottom of the clamp.

lt will be seen by the foregoing details that several improvements are embraced in the present clamp, and which, in respect to shape, has the usual curved or substantially 'U or yoke-shaped body b and clamping screw s with a swivel engaging head or bearing 2 on the end thereof.

In clamps of this kind as hitherto made, so far as I know and believe, there has always been only a single bearing point intogli-al with the foot of the body o and which was directly beneath the screw. Hence in case the screw was somewhat loose in its nut,which was and is a common experience with such clamps, or the stock gripped was uneven or otherwise diliicult Vto engage, there was inevitable tendency in the screw to spring off of center and getout of alinement with the said bearing and to fail to do its work acceptably.

For this reason, and to meet incidental defects in construction and operation, and to provide'a clamp in which these cbjections are obviated I have built the present clamp with a separate bearing piece i on which there are two distinct and separate bearings 5 welded or otherwise permanently secured on the lower end or foot of the body h. ln this connection it may be noted that the said body consists of a piece of'T iron bent to the desired shape, and that the said bearing piece is laid across the iiat flanged Specification of LettersiPateiit.'

Patented Oct. 2S, 15919.

Serial -O. 2Q5f'19'. i

inside thereof,and might be lriveted through said flanges if preferred'. This p-iece 4- has the distinguishing feature of two raised bearings spaced apart relatively as shown and so positioned that both will come, in part, directly beneath the direct down pressure of the screw through the head 2 thereon. This defeats all possible tendency in the screw to spring or work laterally or to get bent out of usable shape, as was cominonwith the single bearing clamp as heretofore made, and particularly insures a sure workingv grip under any conditions of the work.

Other novel features are seen at the top of the clamp. These comprise the special attachment 7?, consisting of a strip of metal having substantially the width of the back ofthe clamp= and bent upon itself with an eye- 8 formed in the bend and having the sides thereof secured by rivets or their equivalent against opposite sides of the said back or rib ll. The end portion of the said rib or back is cut away or removed a suiiicient distance from the end of the said body to provide a flat surfaced projection 9 across the side iianges, and a central opening is formed down through the said projection in line with said eye to receive the thimble-shaped nut l0, inserted from beneath and having a bead or flange' bearing against the bottom of the said projection. The said nut lits snugly in the eye 8 and the bead thereon takes the upward thrust, and said nut is internally threaded to receive the screw s, which is adapted to be operated in the usual manner through the linger grip 12 at its top. A snug lit of the nut in the eye 8 and in the opening through the flanged base of the body b secures the nut firmly therein for all operating purposes, and an exceptionally strong support for the nut is provided by this construe tion and which also helps to hold the screw in alinement on the work.

lt will be noticed that lthe bearing bar 4- extends transversely of the body b and that the bearings 5 come outside said body about half their width on each side, but the portion thereof engaged by head 2 is within the flanges 11i of the said body.

The words inner and outer and top and bottoni are relative, having in view the clamp as seen in the drawing with the nut 8 aboveV and the bearings v5 below.

What I claim is: Y

l. A screw clamp having a body of substantially U-shape with one arm formed with an eye and rivet openings, a beaded nut sleeved within said eye, a clamping strip for said nut secured to said arm by rivets passing through said openings, a screw in said nut, and a swivel head thereon, and a separate permanently affixed transversely across the engaging 'extremity of the other arm and provided with a raised bearing on each end out of axial alinement with said screw and spaced apart at the middle of said bearing piece.

2. A screw clamp having a body formed of T iron bent into the desired shape and having` a flat-sidedv extremity at one end provided with an opening through the saine, an attachment having an eye set over said open ing and afIiXed to opposite sides of the rib on said body, a tubular nut for the screw set into said eye and opening,vand a screw engaged in said nut.

3. A screw clamp having a body bent to approximately Ushape and having a rib centrally on its back and an attachmentat one Copies of this patent may be obtained for bearing piece of metal4 end thereof constructed of a strip of metal having the depth substantially of the said rib and provided with a circular bend forming an eye at its middle and permanently aliXed at its ends on opposite sides to the said rib, the said body having a flat end portion with an opening coincident with said eye, a. tubular nut for the operating screw extending through said hole into said eye and lprovided with an annular enlargement on its inner end bearing against the said flat end portion of the body and a screwengaged in said nut.

4. A screw clamp, Comprising a U-vnember having one arm thereof provided with two shallow lat bosses lying in Vthe same plane relatively near each other and the other arm being provided with a thimbleshaped nut 'and a clamping strip for said nut riveted to said arm, said nut having a clamping screw opposite and intermediate said bosses.

Signed at Cleveland, in the county of Cuyahoga, and State of Ohio, this 1st day of December, 1917.

FRANK G. MARBACH.

ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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