US822775A - Clamp. - Google Patents

Description

PATENTED JUNE 5, 1906.

W. SGHNURR.

CLAMP.

APPLICATION FILED SEPT.15. 1905.

- uvawtoz Witncaaco va- 1, 41% a 2m WILLIAM SOHNURR, OF

NEW YORK, N. Y., ASSIGNOR TO THE UNITED STATES PRINTING COMPANY, OF CINCINNATI, OIIIO, A CORPORATION OF OHIO.

Specification of Letters Patent.

CLAMP.

Patented June 5, 1906.

Applica ion file September 15, 1906. Serial No. 278,660.

To all whom it may concern:

Be it known that I, WILLIAM SOIINURR, of New York, in the county of Kings and State of New York, have invented certain new and useful Improvements in Clamps; and I do hereby declare the followin to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of my invention is to provide improvements in ploying means for adjustablysecuring the clamp as an entirety to a table, and independent means for holding the work to be operated upon.

When used upon metal-trimming machines in the making of electroplates where a number of such plates must have their corresponding ed es cut precisely alike, it is essential that the clamps shall not only be e nipped with means for holding the work,

w lch may be tightened and released independently of the means for securing the clamp to the table-bed, but it is also neces-- sary that the clam as an entirety be evenly balanced and eapa le of nice adjustment to securely hold it in its adjusted positions. Furthermore, it is essential when a series of superposed plates is to be cut that the element iolding the work be moved into engagement therewith in a truly vertical plane, so as to avoid the possibility of the plates being moved relatively to each other. Where this holding element in its adjustment moves in an are, there is a pulling or pushing action upon the plates which tends to destroy their a inement. These plates are expensive, and as the greatest care is necessary in makin them of exactly corresponding size an formation the effectiveness of the clamps becomes an important factor in their manu facture.

In the accompanyin drawings, Figure 1 is a perspective view s owing portion of a metal-trimming machine equipped with clamps embodying my invention, the clamps being illustrated holding a series of plates. Fig. 2 is a side elevation, partly in section, of the clam and table.

Referring to the drawings, 1 designates the bed of a metal-trimming machine desi ned, as

usual, to be moved on tracks 2 for t e purpose of placing the material to be operated that class of clamps emu on in engagement with a rotary cutter 3.

1e bed is shown formed with a plurality of transverse grooves 4, which are of inverted- T shape beneath the surface of the bed.

5 designates the clamp. This is shown consisting of a casting having a base portion 6, at or near one end of which is a vertical post 7. From the top of the latter to the other end of the base extends an arm or brace 8. The base portion is of greater width than oove 4 of the table over which it is designe to be placed and is of such size that it will provide a firm setting or bearing for the clamp upon the table.

9 is a rod freely movable in the bore of the central portion or post 7 of the casting and extending through the latter and the base 6 and having at its lower extremity a rectangular head 10, designed to be accommodated by the inverted-T grooves 4 of the table. By means of a wing-nut 12 engaging the threaded end of the rod 9 the latter may be tightened to secure the clamp to the table.- When this is done, the extent of bearing-surface of the base of the clamp upon the table insures the binding force holding the casting as against possibility of accidental displacement.

Extending forwardly from the post 7 is a horizontal arm 13 of such length that it and its complementary parts will about counterbalance the portion of the clamp at the opposite side of the post-that is, base 6 and brace 8.

14 is a rod threaded in the free end of arm 13, controlled by a hand-wheel 15, and carrying at its lower extremity a presser-foot 16. The connection between this rod and the presser-foot is a swivel-joint 17, so that the presser-foot will be caused to securely hold metal or other work the upper face of which may be irregular or slanted. On the lower face of the presser-foot I have provided a cushion 18.

In practice a series of clamps may be placed in any desired position upon a table that is to say, they may be moved to any point longitudinal y of the grooves 4; or turned axially until their respective presserfeet are at the desired points over the work. U on tightening wing-nuts 12 the clam )8 W111 be firmly held in position, and the presser-feet may then be brought into ongagement with the work. It is obvious that these resser-feet may be released Without affectin the adjustment of the clamp relative to the table.

From the foregoing it will be seen that the objects of my invention are fully attained. The clamp as an entirety is firmly held to the bed and is evenly balanced. The presserfeet move in a vertical plane and effectively hold the series of superposed plates.

I claim as my invent1on In a clamp, a frame or casting having a Vertical 0st formed with a central bore, a rod freel movable in said bore extending above the to of said post and threaded at its upper en said rod having an adjustingnut on such upper end and having a rectangular head at its lower extremity for the purpose stated, a base extending from one side of said post, and an arm rejecting laterall from the opposite side of said post, a vert1 cally-adjustable rod in the free end of said arm, a resser-foot carried by the lower extremity of said rod, and a swivel-joint connecting said resser-foot and said rod.

In testimony whereof I have signed this specification in the presence of two subscribmg witnesses.

WILLIAM SCHNURR.

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