US326586A - Repeating action for square and grand pianos - Google Patents

Description

(No Model.)

F. POLSTER. REPEATING ACTION FOR SQUARE AND GRAND PIANOS.

No. 326,586. Patented Sept. 22, 1885.

UNITED STATES PATENT OFFICEQ FERDINAND POLSTER, OF BALTIMORE, MARYLAND, ASSIGNOE TO \VM. KNABE & 00., OF SAME PLACE.

REPEATlNG-ACTION FOR SQUARE AND GRAND PlANOS.

SPECIFICATION forming part of Letters Patent No. 326,586, dated Septem e 1385- Application filed April 24, 1885.

T0 aZl whom it may concern:

Be it known that I, FERDINAND Porsrnn, of Baltimore, in the county of Baltimore and State of Maryland, have invented certain new and useful Iniprovementsin Repeating-Actions for Grand and Square Pianos; and I do hereby declare the following 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.

My invention relates to an improvement in repeating-actions for grand and square pianos, the object of the same being to simplify the present construction of repeating-actions without increasing the cost of manufacture or increasing the friction between the several parts; and with these ends in view my invention con sists in the parts and combination of parts, as will be more fully described, and pointed out in the claims.

The accompanying drawing represents my improvement in side elevation, some of the parts being shown in section.

A represents the key, mounted in the usual manner, and B the main jack, pivoted at its elbow to the block 0, which latter is pivoted to the stud a at right angles to the pin l),which secures the jack to the block 0. This construction of parts allows the jack,in addition to the usual back and forward motion necessary to escapement, a lateral motion, which prevents the possibility of the main jack jamming or sticking in the notched under lever, D, in which it moves. This under lever, D, is pivotally secured at its rear end to the arm D,

- secured to the ham mer-rest D and is provided near its front end with an elongated slot, 0, in which the free end of the longer arm of the main jack B rests. The front or free end of the under lever, D, is notched to receive the upper end of the auxiliary jack E, to the lower end of which is rigidly secured the screw or pin F, which latter moves loosely in the shorter arm or square of the main jack B. The pin F is preferably provided with screwthreads to enable the button G, havinga cushioned lower face, d, to be adjusted toward and away from the square of the main j ack,and regulate the movement of the upper end of the long arm of the main jack, and also the (No model.)

movement of the under lever and hammer. The auxiliary jack is also provided with the adjusting -screw 6, carrying the cushion 6, against which the long arm of the main jack strikes when the key is struck.

J is a screw secured to the outer end of the square of the main jack, and provided at its lower end with a cup shaped button, J, adapted to receive the upper end of a coiled spring, the lower end of which rests against the block J secured to the key. This button can be adjusted on the screw for regulating the tension of the spring, or the screw can be turned and perform precisely the same function.

K is the hammer-butt, pivoted in the usual manner, and provided on its lower face with an escapement-ball, K, which latter rests on the under lever, immediately over the slot 0 and over the upper end of the long arm of the main jack. Vhen the parts are adjusted by the button G and screw e to permit the upper end of the long arm of the main jack to have free movement in the slot 0, the upper end of the main jack rises above the under lever, strikes the escapementball, and immediately moves to the front of said escapement-ball.

The upward movement of the under lever and jacks is regulated by the screw L, secured in the block G, to which the hammer-butt is pivoted immediately over the front end of the under lever. This screw can be adjusted longitudinall y for increasing or decreasing the upward throw of the under lever.

M is the back-check, secured to the key and operating in the usual manner.

The hammer is held in an elevated position for a repeat of the tone by the under lever, D, which is held in position by the auxiliary jack.

It is evident that numerous slight changes may be made in the form and relative arrangement of parts without departing from the spirit of my invention; hence I would have it understood that I do not limit myself to the 9 exact construction herein shown and described,

but consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. The combination,with an underlever and a main jack, of an auxiliary jack pivotally connected to the under lever, and provided with an adjustable bearing, which latter rests on the main jack.

2. The combination,with an under lever and a mainjack, of an auxiliary jack pivoted to the under lever, a threaded pin secured to the auxiliary jack and resting Within a slot in the square of the main jack, and a button adj ustably secured on the threaded pin.

3. The combination, with an under lever having a slot therein, and a hammer resting immediately over said lever, of the main jack pivoted to the key, and an auxiliary jack connected with the under lever and provided with a pin passing 1oosely through the main jack.

4. The combination, with a key, hammer, and under levcr,of the main jack, an auxiliary jack,and an adjustable stop secured to the auxiliary jack and forming a bearing for the main jack.

5. In a piano-action, the combination, with a key having a block, J, thereon, and a main jack pivoted to said block, of a spring resting on the bl0ck,and a button adjustably secured to the main jack and forming a bearing for the upper end of the spring.

6. In a piano-action, the combination, with a key, ofa block, 0, )ivoted to the key, and a main jack pivoted to the block, substantially as described.

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

FERDINAND POLSTER.

Witnesses:

E. A. HEINZ, GEO. KOPPELMAN.

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