Improvements in Grand Pianoforte Actions.
Year: 1899

page_text: Date of Application, 5th Apr., 1899
Complete Specification Left, 9th Nov., 1899-Accepted, 30th Dec., 1899
Improvements in Grand Pianoforte Actions..
I, JOSEPH HERRBURGER, of 16, Rue de l'Evangile, Paris, in the Republic of
France, Pianoforte Action Manufacturer, do hereby declare the nature of this
invention to be as follows:
My invention relates to improvements in grand pianoforte actions and cont-
prises the improvements hereinafter described and illustrated in the accompany-
ing drawing, in which:--
Figure 1 is a side view illustrating the improved action; and
Figures 2 and 3 are views illustrating improvements in damper blocks.
In my improved action the lever a which is pivoted at 6 has fitted to the end
of its short arm a spring e fixed at the point c arranged at a convenient distance.
from the fulcrum b such that when the lever a comes in contact with the screw d
the said point c¹ rises and pulls the spring upwards so as to draw the point ²
where it is attached to the jack e away from the centre of the said jack and
thereby increase the strength of the spring precisely at the moment it requires
its whole force in order to return the jack under the roller f. The spring
operated upon by a regulating screw c³ whereby its tension can be increased or
diminished as required.
is
I advantageously construct the damper-block in such a manner that the
damper-heads can be adjusted without its being necessary to raise or lower the
damper wire in the damper-block hole.
This damper-block (see Figures 2 and 3) is in two parts g and connected by
a screw and a metal wire fixed in the part hand movable or adapted to slide
in the part g.
The upper part g holds the damper-wire by means of the
screw 7.
The screw is formed with left and right hand threads and is provided
with a flange or the like having holes, into which a tool can be inserted for
turning the screw to the right or to the left, and causing the parts of the damper-
block to move up or down. The damper head at the top of the damper-wire &
fixed in the block g moves with the said block g so that the damper-heads can'
be easily adjusted with great nicety.
I sometimes make the damper-block with a third pedal shoulder m as shewn
in Figure 3.
1000
Improvements in Grand Pianoforte Actions.
I, JOSEPH HERRBURGER, of 16, Rue de l'Evangile, Paris, in the Republic of
France, Pianoforte Action Manufacturer, do hereby declare the nature of this
[Price 8d1

page_text: invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
My invention relates to improvements in grand pianoforte actions and com-
prises the improvements hereinafter described, and illustrated in the drawing
accompanying my Provisional Specification in which:-
Figure 1 is a side view illustrating the improved action; and
Figures 2 and 3 are views illustrating improvements in damper blocks.
In my improved action the lever a which is pivoted at 6 has fitted to the end
of its short arm a spring e fixed at the point c¹ arranged at a convenient distance
from the fulcrum b such that when the lever a comes in contact with the screw d
the said point rises and pulls the spring c upwards so as to draw the point c
where it is attached to the jack e away from the centre of the said jack and
thereby increase the strength of the spring precisely at the moment it requires
its whole force in order to return the jack under the roller f. The spring c is
operated upon by a regulating screw whereby its tension can be increased or
diminished as required.
I advantageously construct the damper-block in such a manner that the
damper-heads can be adjusted without its being necessary to raise or lower the
damper wire in the damper-block hole.
This damper-block (see Figures 2 and 3) is in two parts g and connected by
a screw and a metal wire j fixed in the part hand movable or adapted to slide
in the part g. The upper part g holds the damper-wire k by means of the
screw 7.
The screw is formed with left and right hand threads and is provided
with a flange or the like having holes, into which a tool can be inserted for
turning the screw to the right or to the left, and causing the parts of the damper-
block to move up or down. The damper head at the top of the damper-wire k
fixed in the block 9 moves with the said block 9 so that the damper-heads can
be easily adjusted with great nicety.
I sometimes make the damper-block with a third pedal shoulder m as shewn
in Figure 3.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a grand pianoforte action, the arrangement of the spring c fixed at the
point ein such a way that on operating the same the point 2, where it is attached
to the jack e, is drawn away from the centre of the said jack, substantially as
set forth.
2. In a grand pianoforte action a screw such as connecting the two parts g
and of the damper block so that the part g can move up and down on turning
the screw either to the right or to the left, substantially as set forth.
Dated this 9th day of November 1899.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.