Improved Repeating or Hammer Action for Pianofortes and other similar Instruments.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improved Repeating or Hammer Action for Pianofortes and other
similar Instruments.
I, ADOLPH LEXOW, of 53/54 Fasanen Strasse, of the City of Charlottenburg,
in the Empire of Germany, Manufacturer, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention relates to an improved repeating or hammer action for pianofortes
or other similar instruments, and has for its chief object to catch the hammers
after having struck the wires, in such manner as to allow of the said wires freely
vibrating, and to prevent the hammers from moving after having struck the wires,
thus securing an exceedingly exact and precise repetition or operation of the
hammer mechanism.
In order that my invention may be clearly understood, I will now refer to the
accompanying drawing in which,
Fig. 1 is a vertical section of the hammer action, the hammer mechanism being
shown in its normal position viz.: when the key is raised.
Fig. 2 is a like view showing the hammer mechanism operated by depressing or
striking the key.
The catching-block or head b, which is secured to the hammer-butt a in any
suitable manner, carries a pivotally-connected catch-link c, the movement of
which is regulated or limited by the adjusting-knob, button or puppet d. The
outer face of the catch-link e provided with the usual lining, is curved or hollowed
out in such manner, that, on being released, it engages with the correspondingly-
arched head of the inner arm or part of the jack or hopper e. In this way all
oscillation of the hammer imparted by such jack or hopper is absolutely avoided,
without at the same time producing any appreciable shock, blow or concussion.
A hoop or cord secured to the lower part of the catch-link e, engages with the
free bent-end of the spring a secured to the lower part of the jack e.
The spring g
thus serves a threefold purpose, viz. forcing the jack e under or into engagement
with the hammer-butt a, pressing the catch-link c, so as to engage with the head e¹
of the jack e, and finally, by the aid of the catch-link c'of the catching-block b,
causing the falling off of the hammer.
The jack e, as shown, consists of two parts or arms, adjustably secured to each
other by a set-screw e², the one with the head e being pivotally connected to the
other engaging with the hammer-butt a. This form of jack, however, is not
essential; it is only necessary that the construction of said head e' be such that
the jack engages with the curved or claw-like catch-link c, which can evidently be
secured even if the jack or hopper e be composed of only one part.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare, that what I
claim is :-
An improved repeating or hammer action for pianofortes and other similar
instruments, in which action a curved or claw-like catch-link is pivotally connected
with the catching-block suitably secured to the hammer-butt, the said catch-link
being further connected with the jack or hopper by means of a spring, engaging
with a hoop or cord of said catch-link, substantially as and for the purpose
described and shown in the drawing.
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1
ALLISON BROS.,
Agents for the Applicant.