US107391A - Chaeles m - Google Patents

Description

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Letters Patent No. 107 ,391, dated September 13, 1870.

SCREW-CLAMP FOR PIANO-PINS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, CHARLES M. LINDSAY, of Forreston, in the county of Ogle and State ot'Illinois, have invented anew and improved Screw-Fastener for Piano-Pins; and I do hereby declare the following to be a full, clear, and exact description ofthe same, reference being had to the accompanying drawing making apart of this specification, in whichi Figure 1 is plan view;

Figure 2, a side elevation; and

Figure 3, a perspective view.

This invention hns for its object to prevent the pins to which the ends of the strings of pianos or other stringed musical instruments are fastened, and by turning which thc strings are tightened, from turning hackwaldmnder the strain to which they are subject when the strings are taut.

The invention consists of a stem, having an exterior screw-thread running for a little distance from one end, and at the other end a four-sided or polygonal head, in combination with two cross-bars, one ot' which is furnished with a threaded socket of proper size to be fitted by the threaded part of the stein, and the other of which has anoriiice large enough to pass the stem through, this instrument being intended for use in connection with disks fixed on the heads of pianopins, and having grooved peripheries, between any two ofA which disks the stem, with one ofthe cross-bars on it, is passed, and then turned into thc socket of the other cross-bar, after which, by applying a wrench to the head of the stem, the latter may be turned until the cross-bars are drawn as tightlyinto the grooves of the disks as may be necessary, in order to prevent the saine from rotating backward.

In the drawinga is apart of a piano-frame;

l1 are strings of the instrument;

c is the bridge over which the strings pass d are the pins to which the ends of the strings. are fastened;

c are the grooved disks fixed on the heads of the pins;

f is thepcylindrical ste-ni; and

71y are the cross-bars.

The sten] and crossbars should be made of hardened steel, and the disks of any softer metal.

Having thus described my invention,

What I claim as new, and desireto secure by Letters Patent, is-

The stem fand cross-bars h, constructed and operating as and for the purpose described.

- CHARLES M. LINDSAY.

Witnesses JOHN C. GALBRAITH, D. H. REYNOLDS;

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