An Improved Method of Constructing Transposing Pianofortes.
Year: 1894

page_text: Date of Application, 6th Apr., 1894
Complete Specification Left, 5th Jan., 1895-Accepted, 16th Feb., 1895
PROVISIONAL SPECIFICATION.
An Improved Method of Constructing Transposing Pianofortes.
WILLIAM GLEN EAVESTAFF WILLIAM EAVESTAFF FREDERICK CHARLES
EAVESTAFF of 14 Berners Street London W. Pianoforte Manufacturers do
hereby declare the nature of this invention to be as follows:-
The object of this invention is an improved method of constructing transposing
pianofortes which can be adapted to either upright or horizontal instruments :-
To accomplish the above we place the framework which supports the key frame
& keys and which is practically known as and will be hereafter called the key
bottom upon centres placed in the required position one at each end and we also
connect with the said key bottom a movement for keeping the keys always in their
proper position so that the key bottom cannot be moved unless required. We also
attach to the key bottom a lever connected with the keys which is a means of
transposing them. To this lever we fix a metal piece or pin which pin is made so
as to fit into a series of holes in a metal plate the said holes being placed at
intervals which correspond with the scale of the keys. The object of having this
pin attached to the lever is to prevent the lever being moved before the key
bottom raised or thrown out of gear thus preventing any damage being done to
the mechanism as until the key bottom is raised the lever that transposes the keys
cannot be moved. To transpose the keys it is only necessary to release the
movement which keeps the key bottom in its proper position and the key bottom
can then be raised to the required distance in which position it remains whilst the
transposition is effected the movement required being shewn by a pointer moving
with the keys and indicating the transposition of the different notes on a suitable
dial. The transposition having been accomplished the movement which holds the
key bottom out of position is released and the key botton & keys then return to
their proper place.
2004
FREDERICK
We WILLIAM GLEN EAVESTAFF WILLIAM EAVESTAFF
CHARLES EAVESTAFF 14 Berners Street London W. Pianoforte Manufacturers
do hereby declare the nature of this invention and in what manner the same is to
Price 8d1

page_text: be performed, to be particularly described and ascertained in and by the following
statement :-
The object of this invention is an improved method of constructing transposing
pianofortes either upright or horizontal:-
To accomplish the above we place the framework A which supports the key
frame K and keys L and which is practically known and will be hereafter called
the key bottom upon centres B B placed in the required position one at each end
and we also connect with the said key bottom A a movement C for keeping the
keys always in their proper position so that the key bottom cannot be moved unless
required. We also attach to the key bottom A a lever D connected with the
keys L which is a means of moving or transposing them. To the said lever D we
fix a metal piece or pin E which is made to fit into a series of holes in a metal
plate H the said holes being drilled at intervals corresponding with the scale of the
keys and mechanism. The object of having this pin E attached to the said
lever D is to prevent the lever D being moved either way before the key bottom A
is thrown out of gear and thus preventing any damage being caused to the
mechanism as until the key bottom A is raised the lever D that transposes the
keys L cannot be moved either way. To move or transpose the keys L it is only
necessary to release the movement C which keeps the key bottom A in its proper
position and the key bottom A can then be raised to the required distance in which
position it remains whilst the transposition is effected the movement required being
shewn by a pointer moving with the keys and indicating the transposition of the
different notes on a dial. The transposition having been effected the movement C
which holds the key bottom out of position is released and the key bottom and keys
then return to their proper position.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The arrangement of the parts forming the said invention.
2. The movement of the key bottom A and keys L as applied to transposing
pianofortes.
3. The lever D with pin E attached for producing the transposition movement
of a pivotted key bottom substantially as above described and illustrated in the
annexed drawing.
Dated this Fourth day of January 1805.
WILLIAM GLEN EAVESTAFF.
WILLIAM EAVESTAFF.
FREDERICK CHARLES EAVESTAFF.