IMPROVEMENTS IN THE CON- CautiATIONT AR Prvo ARTE & CUTIONS
Year: 1881

page_text: LETTERS PATENT to George Henry Brockbank, of Camden Town, in the
County of Middlesex, for an Invention of "IMPROVEMENTS IN THE CON-
CautiATIONT AR Prvo ARTE & CUTIONS"
PROVISIONAL SPECIFICATION left by the said George Henry Brockbank
at the Oflice of the Commissioners of Patents on the 4th November 1881.
GEORGE HENRY BROCKBANK, of Camden Town, in the County of Middlesex.
"IMPROVEMENTS IN THE CONSTRUCTION OF PIANO FORTE ACTIONS."
The first part of this Invention relates to the check.
According to this part of my Invention I screw or otherwise suitably fix into
the action butt, as near as possible to the working centre of same, a piece of bent
wire (or its equivalent) to act as the check; I also bevel the front lower end of the
butt at the same angle as the bevel on the top of the striker. The effect of this
arrangement is to cause a more rapid check and release than is the case with
ordinary check actions, thereby gaining a superior repitition.
According to the second part of this Invention, instead of the usual metal fork
piece to carry the centre wire of the butts, I insert a sinal! wooden peg into the
lower part of the butt to receive the centre pin, and glue the other end of the said
wooden peg into the hammer rail. I also adopt this latter improvement to the
dampers, thereby effecting a great saving in the cost of the action.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Henry Brockbank in the Great Seal Patent Office on the
4th May 1882.
GEORGE HENRY BROCKBANK, of Camden Town, in the County of Middlesex.
"IMPROVEMENTS IN THE CONSTRUCTION OF PIANO-FORTE ACTIONS."
The first part of this Invention relates to the check. According to this part of
my Invention I screw or otherwise suitably fix into the action butt, as near as
possible to the working centre of same, a piece of bent wire (or its equivalent) to
act as the check; I also bevel the front lower end of the butt at the same angle as
the bevel on the top of the sticker. The effect of this arrangement is to cause a
more rapid check and release than is the case with ordinary check actions, thereby
gaining a superior repitition. According to the second part of this Invention, instead
of the usual metal fork piece to carry the centre wire of the butts, I insert a small
wooden peg into the lower part of the butt to receive the centre pin, and glue the
other end of the said wooden peg into the hammer rail. I also adopt this latter
improvement to the dampers, thereby effecting a great saving in the cost of the
action. And in order to explain my said Invention more fully I will now proceed
to describe the same with reference to the accompanying Sheet of Drawings.
Figs. I and 28new views or a piano-forte action with my improvements
thereto. With regard to the first part of my Invention, viz., the check, I fix a
piece of bent wire or other suitable material a into the action butt b, as near as
possible to the working centre of same; I also bevel the front lower end of the said
butt at c to about the same angle as the bevel on the top of the sticker d. The
action of the check as above will be as follows:-After the hammer e has struck
the string, the top bevel part of the sticker d will be pushed up the bevel c of the
butt b, and the piece of wire a will hold the hammer in check, as shewn at Fig. 1,
until the key is released, when the top of the sticker will be brought down again,
and allow the hammer to be brought back to its normal position by the spring g
in the ordinary way, and as shewn at Fig. 2. By the above arrangement a more
rapid check and release will take place than in check actions as heretofore
constructed. With regard to the second part of my said Invention I insert a small
wooden peg into the lower part of the butt b to receive the centre pin i, and
glue or otherwise suitably fix the other end of this wooden peg to the hammer
rail ; I also adopt this same method of pivotting to the dampers, in which case
the wooden peg, represented at 1, and the pin at m, it will be seen the lower end of
the sticker is pivotted in a similar way. This improved description of pivotting
makes a great saving in the cost of the action as compared with the old method of
hingeing.
Having thus described the nature and object of my said Invention and the
means whereby the same may be carried into practical effect, I would remark in
conclusion that what I claim as my Invention and desire to secure by the
herein before in part recited Letters Patent is,—
Firstly. The piece marked a on the Drawing or its equivalent, substantially as
and for the purposes set forth.
Secondly. Pivotting the hammer, butt, and damper, substantially as set forth.
In witness whereof, I, the said George Henry Brockbank, have hereunto set
my hand and seal, this Fourth day of May, in the year of our Lord One
thousand eight hundred and eighty two.
2
DRAGED