Improvemenis in or relating to Repetition and Damping Mechanisms for Pianos.
Year: 1889

page_text: Date of Application, 5th July, 1889
Complete Specification Left, 5th Apr., 1890-Accepted 10th May, 1890
PROVISIONAL SPECIFICATION.
Improvemenis in or relating to Repetition and Damping Mechanisms
for Pianos.
A communication from abroad by FERDINAND SCHAAF, of Frankfort-on-the-Main, in
the Empire of Germany.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, & 6, Bank Street, Manchester, both in
the County of Lancaster, and 323, High Holborn, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
:―
On the accompanying drawing, A is the connecting rod, which communicates the
This lever bears a little post b
lift or stroke of the keys T to the principal lever B.
with a bolster, against which the kicker St is pressed normally by the spring F, carried
by the lever B.
The hammer H is supported after its recoil, by the nose N of the kicker St, and
the repetition is thus effected.
In order that the hammer may, even if the tonch be feeble, overcome the resistance
of the kicker at each recoil, and so move the kicker about its pivot for a short distance,
and rest upon its nose N, the spring F is joined with the kicker St in such a manner
that the shorter arm of the spring draws the kicker with a slight force towards the
post by means of the cord v, whilst the longer arm of the spring, which is of about
twice the strength, and presses normally against the underside of the kicker, is stopped
in its upward movement and pressed off the kicker by the stopper Ku, shortly before
the hammer recoils.
During the recoil, only the short arm of the spring is acting upon the kicker. The
longer arin is acting only when the keys T are released, or if the hammer, by a strong
touch, receils for a longer distance.
The stopper Ku is fixed on the hammer frame E.
P is the lifter to lift the damper D
A support C carries the damping mechanism.
from the strings when it is not required. The damper D has a little plate t on which
the cord S is fastened, the other end of which is fixed on the wire o" upon the lever B.
As soon as the key T is touched and the lever B is lifted, the cord S will be tightened
and the damper is lifted. On releasing the keys, the spring F¹ presses the damper
again towards the strings.
T1 1000
COMPLETE SPECIFICATION.
Improvements in or relating to Repetition and Damping Mechanisms
for Pianos.
A communication from abroad by FERDINAND SCHAAF, of Frankfort-on-the-Main, in
the Empire of Germany.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool and 6 Bank Street, Manchester both
in the County of Lancaster, and 323, High Holborn in the County of Middlesex,
Civil Engineer, 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:-
On the drawing accompanying the provisional specification, A is the connecting

page_text: rod, which communicates the lift or stroke of the keys T to the principal lever B.
This lever bears a little post with a bolster, against which the kicker St is pressed
normally by the spring F, carried by the lever B.
The hammer H is supported, after its recoil, by the nose N of the kicker St, and
the repetition is thus effected.
In order that the hammer may, even if the touch he feeble, overcome the resistance
of the kicker at each recoil, and so move the kicker about its pivot for a short
distance, and rest upon its nose N, the spring F is joined with the kicker St in such
a manner that the shorter arm of the spring draws the kicker with a slight force
towards the post 6 by means of the cord v, whilst the longer arm of the spring, which
is of about twice the strength, and presses normally against the underside of the
kicker, is stopped in its upward movement and pressed off the kicker by the stopper Au,
shortly before the hammer recoils.
During the recoil, only the short arm of the spring is acting upon the kicker. The
longer arm is acting only when the keys are released, or if the hammer, by a strong
touch, recoils for a longer distance.
The stopper Ku is fixed on the hammer frame E.
A support C carries the damping mechanism. P is the lifter to lift the damper ])
from the strings when it is not required. The damper D has a little plate t on which
the cord S is fastened, the other end of which is fixed on the wire o upon the lever B.
As soon as the key T is touched and the lever B is lifted, the cord S will be tightened
and the damper is lifted. On releasing the keys, the spring F' presses the damper
again towards the strings.
.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
In repetition and damping mechanism for pianos
:-
1. On the main lever B, the application of the spring F, the shorter arm of which
is connected to the kicker St by the cord whilst the longer arm of the spring
presses against said kicker until it is stopped by the stopper Ku, substantially as
described and shown.
2. On the kicker St, the application of the nose N adapted to form a springy
support for the hammer after its recoil and thereby effect the repetition, substantially
as described.
3. The combination of the damper D, the plate t carried thereby, and a cord S
connecting said plate and the main lever B by means of a wire ol, whereby the
damper is retracted when said lever B is oscillated, substantially as described.
Dated this 2nd day of April 1890.
WM. P. THOMPSON & Co.,
Agents for the Applicant.