US1365340A - Plano-hammer - Google Patents

Description

C. J. AND W. J. PFBIEMER. PIANO HAMMER.

APPLICATiON FILED Mm 15, I919.

1,365,340. Patented Jan/11, 1921.

INVENTORY WITNESSES- A TTORNEYS UNITED STATES PATENT OFFICE.

CHARLES JOSEPH PFRIEMER AND WILLIAM J. PFRIEMER, OF NEW YORK, N. Y.

PIANO-HAMMER.

Specification of Letters Patent.

Patented Jan. 11, 1921.

Application filed March 15, 1919. Serial No. 282,844.

To all whom it may concern Be. it'known that we, CHARLES J. PFRInnun and WILLIAM J. PFRIEMER, citizens of the United States, and residents of the city of New York, borough of the Bronx, in the county of Bronx and State of New York, have invented a new and Improved Piano- Hammer, of which the following is a full, clear, and exact description.

. This invention relates to improvements in piano hammers and consists in the combination construction and arrangement hereafter described and claimed.

Among the objects of our invention is to provide a device by means of which the clasticity of the felt, or its equivalent, is in creased.

A further object is to provide a piano hammer with the felt so secured and fastened as to be entirely free from direct contact with the wood or like material which may form the hammer head or molding directly connected with the piano action.

A still further object is to simplify the construction of piano hammers so as to make effective the foregoing and other specific objects.

With the foregoing and other objects in view the invention consists in the arrangement and combination of parts hereinafter described and claimed, and while the invention is not restricted to the exact details of construction disclosed or suggested herein, still for the purpose of illustrating the best known embodiment thereof reference is had to the accompanying drawings, in which like reference characters designate the same parts in the several views, and in which- Figure 1 is a side elevation showing one of our improved hammers applied to the lower register of the piano and indicating its relation to the strings of an upright piano.

Fig. 2' is a horizontal section and partial plan on the line 2-2 of Fig. 1, the view be ing on a larger scale than Fig. 1.

Fig. 3 is a striking end view of a hammer such as indicated in Fig. 2; and

. Fig. 4 is a side elevation of a treble hammer in accordance with our invention.

Referring now more specifically to the drawings we show a hammer head or molding 10 made of wood or any other sultable material and carried as usual on the outer end of a hammer shank 11 constitutlng a part of the piano action. The head is so formed as to receive a'properly shaped base 12 of high grade resilient rubber or any other suitable material so disposed as to serve to insulate or cushion the inner surface of the hammer head from direct contact with the felt striking member 13.

The felt is secured in the base or cushion 12 in any suitable manner, but as shown the body of felt consists of a strip skived or thinned at its ends and folded in the middle bringing the thinned or skived end portions together within the cushion as indicated at 13 The tone quality of a piano depends primarily on the vibrations of the strings 14; and these vibrations may be controlled within limits by the attacking force. These vibrations are increased or diminished as a result of the blow struck by the hammer and the quick escapement of the hammer from the string after striking. This escapement of the hammer from the string is accelerated by the resilient action of the material used in the base or cushion 12. The fact that the felt or striking member 13 of this hammer is attached solely to and carried by or within the resilient and insulating base or cushion 12 and spaced from immediate contact with the hammer head or molding 10, tends to overcome to a large extent the disagreeable knock or thum of the wood or other material through the felt striking member incident to the usual piano hammer construction.

The treble hammer 10', shown in Fig. l on a scale proportional to Figs. 2 and 3 of a lower register hammer, is made preferably in the same manner but differing in design according to the register, a fact well understood in the piano hammer art. The features of improvement though on a smaller scale are the same as above set forth.

Te claim:

1. A piano hammer comprising a head having a rounded bottom cavity in its striking end, a cushion of resilient solid rubber fitted in. said cavity and having a notch, and a striking member carried entirely by said cushion in its notch and remote from the head.

2. A piano hammer comprising a head having a rounded bottomed cavity in its striking end, a body of resilient material correspondingly shaped and fitted in said cavity and having a V-shaped recess therein remote from the head, and a striking body of fibrous resilient material fitted into said V- shaped recess and having a rounded striking surface projecting beyond the same.

3. The herein described piano hammer comprising a head having-a forked striking end, a resilient body constituting a cushion of rubber fitted in said fork and having an outside V-shaped recess, and a fibrous resilient striking body having tapered ends folded together and projecting into said V- shuped recess and so held in the same supported by the cushion remote from the forked )ortion of the head.

C ARLES JOSEPH PFRIEMER, WILLIAM J. PFRIEMER.

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