US30959A - Eljsha clark - Google Patents

Description

NE STATES PATENT FFICE.

ELisHA CLARK, or NEW YORK, N. Y.

COPYING-PRESS.

A Specification of Letters Patent No. 30,959, dated December 18, 1860.

To all whom it may concern:

Be it known that I, ELISHA CLARK, of the city, county, and State of New York, have invented a new and useful Improvement in Copying-Presses; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, making a part of this specification, in which- Figure l is an inverted plan with the bridge piece p, and portions of the hangers li, and legs J, removed'. F ig. 2 is a. vertical section through the parts as indicated by the red angle line o, in Fig. l.

Similar letters of reference in both figures, indicate corresponding parts.

To enable those skilled in the art to make and use my invention I will proceed to describe its construction and operation, having reference to the accompanying drawing.

The apparatus is supported on four legs or posts J, which are made hollow, as seen in Fig. 2, for the reception of the connecting rods f, and the springs s, with which each of the said rods f, are provided.

The legs are bored out from the lower end, with a larger auger than the upper end, which forms the shoulder a, near the top of the legs, which acts as a seat for the upper end of the springs s, to rest against. rIhe springs should be coiled from the best steel The rods f, are each provided with a head g, at the-lower end, and they pass up through within the coil of the springs s, through the bed plates B, and B, and receive the caps cl, on their upper end which may be screwed on, or they may be secured by the pins o.

The screw S, which is double threaded, so as to act rapidly is made square at the upper end, and is inserted Vin a corresponding shaped mortise in the bed plate B, which prevents it from turning when the screw wheel is revolved. The said screw S, is supported by the hangers it, and bridge piece p, which are suspended from the under side of the primary bed plate B, to which they are secured by screws.

The screw wheel D, is rigidly tiXed to the nut F, and upon the upper face of the said nut, the anti ressure bridge C, rests. This bridge C, is 'tted at each end to the vertical ways c, on the side of the hangers ii, as seen in Fig. l, and is provided with four studs or pins a, which project through the bed plate B, and against the secondary or movable bed-plate B.

By turning the screw wheel D, in the proper direction, the antipressure bridge C, with its studs a, is made to rise which also elevates the bed plate B', at the same time compressing the spring s. The copy book may then be placed between the two bed plates B, and B, and the screw wheel turned back so as to allow the springs s, to act upon the book with their full torce. The said book is relieved by running the screw wheel D, up the screw again, when it may be taken out and placed upon the upper, or movable bed plate, for examination and reference.

I propose to use marble or other suitable material for the beds B, B.

`What I claim as new and desire to secure by Letters Patent, is-

The arrangement of the antipressure bridge C, studs a screw S and nut F with the plates B B, rods f and springs s in the manner and for the purpose herein shown and described.

ELISHA CLARK.

Witnesses:

M. M. LIVINGSTON, G. W. REED.

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