US437403A - Clamp - Google Patents

Description

(No Model.) l

A. NACRE & A. BRINKMANN. y

CLAMP. No. 437,403. y Patented Sept. 30, 1890*.;

UNITED STATES PATENT OFFICE.

ARNoLD NACRE AND ALBERT RRINKMANN, or PHILADELPHIA,

PENNsYLvANIA.

CLAM P.

i SPECIFICATION forming part of Letters Patent No. 437,403, dated September 30, 1890.

Application led January 16, 1890. Serial No. 337,132. (No model.)

.To a/ZZ whom it may concern:

Beit known that'we, ARNOLD NACRE and ALBERT BRINKMANN, citizens `of the United States, residing at Philadelphia, in the county of Philadelphia. and State of Pennsylvania, United States of America, have invented certain new and useful Improvements in Clamps, of which the following is a full, clear, and exact description.

The aim of our invention is to provide a simple and inexpensive clamp which may be quickly adjusted and secured, and which shall be without springs or other parts liable to become inoperative.

In the accompanying drawings, Figure l is a perspective view of our clamp. Fig. 2 is a side view of the same with the movable jaw partly in section.

Referring tothe drawings, A represents a straight bar or stock with smooth edges and with a rigid jaw ct extending at right angles from one end.

Bis the movable jaw, having an opening or mertise through one end to admit the bar A, on which it slides. Near its rear side the movable jaw is provided with the hardenedsteel bearing-plate a,seated in arecess therein and arranged to bear on a hard-metal plate a2, which is extended through the opening in the jaw and arranged to slide on the edge of bar A. Against the opposite edge of the bar there is a second bearing-plate e, also extended through the movable jaw and recessed to receive the end of a hand-screw d, tapped into the jaw near its forward side. Each of the bearing-plates has its ends widened or extended laterally beyond the opening in the jaw, as shown, these widened or shouldered ends serving to carry the plates along the bar with the jaw and to prevent them from sliding endwise out of the latter.

In assembling the-parts the plates are rst inserted into the jaw and turned down to their places and the bar A inserted between them, whereupon it acts to prevent the plates from escaping under any circumstances. A screw g in the end of the bar prevents the accidental escape of the jaw.

In operating the clamp the movable jaw is carried forward until the object to be held bears against both jaws, after which a partial revolution of the screw is sufficient to lock the parts securely and t-o apply a pressure to the object. As the screw is turned inward it acts to tip the movable jaw on the plate a as a fulcrum toward its companion. The pressure of the jaw and the screw causes the bearing-plates to engage securely with the bar A, so that the jaw is held Iirmlyin position and the edges of the bar protected from the mutilation which it would otherwise receive from the screw and the plate a.

The groove shown in the interior wall is intended to afford an increased opening to facilitate the introduction of the bearing-plate e before the bar A is passed through the movable jaw. p

1. Inaclamp,thebarA,having thelixedjaw, in combination with the sliding jaw through which the bar A extends, the. two bearingplates seated within the jaw and enlarged at the ends to prevent their escape, and the hand-screw seated in the jaw and acting against the outer plate.

2. In combination with the bar with the fixed jaw, the mortised sliding jaw, the plate a' seated therein, the loose plate a2, extended through the jaw and widened at the ends to v ARNOLD NACKE. ALBERT BRINKMANN.

Vitnesses:

AWILLIAM J. KELLY, HAROLD E. COBB.

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