AN IMPROVEMENT IN THE IRON FRAMES OF UPRIGHT AND GRAND PIANOS
Year: 1884

page_text: I JEAN BOURRY, Manufacturer of Pianos, Owner of the firm Hüni & Hübert
residing at Zurich in Switzerland do hereby declare the nature of the said invention
for "AN IMPROVEMENT IN THE IRON FRAMES OF UPRIGHT AND GRAND PIANOS
to be as follows:-
.
錄
The object of this invention is to dispense with the stays or struts placed before
or upon the sounding board, and connected with the iron frame of upright and
grand pianos, which stays have to oppose the necessary resistance to the strain or
tension of the strings, but impede the development of the sound.
In this improved construction the strain or tension of the strings is counter
balanced by strong wires behind or below the sounding board, leaving it free from
any obstructions on the side on which the strings are stretched and permits of
considerably reducing the weight of the frame.
The wrest plank and parts connected therewith are arranged in a manner
similar to the usual one.
T shaped stays beneath the sounding board have projections at the back of their
ends furnished with holes admitting iron or steel wires, which can be bent or
stretched by nuts.
Wooden saddles or bridge pieces over which the wires are bent compensate the
momentum of flexion on the stays produced by the tension of the strings. The
distance between the stays and the wires on one side, and the strings on the other
being equal, the tension is equivalent on both sides of the frame. The sounding
board is secured in grooves of the frame work.

page_text: COMPLETE SPECIFICATION.
I JEAN BOURRY of Zurich, Switzerland, do hereby declare the nature of this
invention for "AN IMPROVEMENT IN THE IRON FRAMES OF UPRIGHT AND GRAND
PIANOS" and in what manner the same is to bo performed, to be particularly
described and ascertained in and by the following statement:-
The object of this invention is to dispense with the stays or struts placed before
or upon the sounding board and connected with the iron frame of upright and
grand pianos, which stays have to oppose the necessary resistance to the strain or
tension of the strings but impede the development of the sound.
In the construction shown by the annexed drawing, the strain or tension of the
strings is counterbalanced by strong wires behind or below the sounding board,
leaving it free from any obstructions on the side of the strings and permits of
considerably reducing the weight of the frame.
a and b
Figure 1 represents a front view of the frame. Figure 2 an edge view.
are the wrest planks of an upright cross stringed piano; c is the sounding board,
d the cross section of the upper part of the bridge. The T shaped stays e of which
a cross section is shown at fhave projections g g' g' at the back of their extremities,
with holes admitting iron or steel wires which can be bent or stretched by the
nuts kkk. The wooden saddles over which the wires are bent compensate
the momentum of flexion on the stays e produced by the tension of the strings.
The distance between the stays e and the wires on one side and the strings on the
other being equal the tension is equivalent on both sides of the frame. The
Bounding board is secured in the grooves h h¹ h² of the frame.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
The substitution for the stays or struts usually connected to the frames of
upright and grand pianos of steel or iron wires on the hind part of the frames to
counterbalance the tension or draught of the strings leaving the sounding board
free from any obstruction all substantially as set forth.

page_text: "
I JEAN BOURRY, Manufacturer of Pianos, Owner of the firm Hüni & Hübert
siding at Zurich in Switzerland do hereby declare the nature of the said invention
fr "AN IMPROVEMENT IN THE IRON FRAMES OF UPRIGHT AND GRAND PIANOS
to be as follows:-
"
The object of this invention is to dispense with the stays or struts placed before
or upon the sounding board, and connected with the iron frame of upright and
grand pianos, which stays have to oppose the necessary resistance to the strain or
tension of the strings, but impede the development of the sound.
In this improved construction the strain or tension of the strings is counter
balanced by strong wires behind or below the sounding board, leaving it free from
any obstructions on the side on which the strings are stretched and permits of
considerably reducing the weight of the frame.
The wrest plank and parts connected therewith are arranged in a manner
similar to the usual one.
Tshaped stays beneath the sounding board have projections at the back of their
ends furnished with holes admitting iron or steel wires, which can be 'bent or
stretched by nuts.
Wooden saddles or bridge pieces over which the wires are bent compensate the
momentum of flexion on the stays produced by the tension of the strings. The
distance between the stays and the wires on one side, and the strings on the other
being equal, the tension is equivalent on both sides of the frame. The sounding
board is secured in grooves of the frame work:

page_text: COMPLETE SPECIFICATION.
I JEAN BOURRY of Zurich, Switzerland, do hereby declare the nature of this
invention for "AN IMPROVEMENT IN THE IRON FRAMES OF UPRIGHT AND GRAND
PIANOS" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
The object of this invention is to dispense with the stays or struts placed before
or upon the sounding board and connected with the iron frame of upright and
grand pianos, which stays have to oppose the necessary resistance to the strain or
tension of the strings but impede the development of the sound.
In the construction shown by the annexed drawing, the strain or tension of the
strings is counterbalanced by strong wires behind or below the sounding board,
leaving it free from any obstructions on the side of the strings and permits of
considerably reducing the weight of the frame.
a and b
Figure 1 represents a front view of the frame. Figure 2 an edge view.
are the wrest planks of an upright cross stringed piano; c is the sounding board,
d the cross section of the upper part of the bridge. The T shaped stays e of which
a cross section is shown at f have projections g g¹ g³ at the back of their extremities,
with holes admitting iron or steel wires which can be bent or stretched by the
nuts kkk. The. wooden saddles i¹ over which the wires are bent compensate
the momentum of flexion on the stays e produced by the tension of the strings.
The distance between the stays e and the wires on one side and the strings on the
other being equal the tension is equivalent on both sides of the frame. The
sounding board is secured in the grooves h h¹ h³ of the frame.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
The substitution for the stays or struts usually connected to the frames of
upright and grand pianos of steel or iron wires on the hind part of the frames to
counterbalance the tension or draught of the strings leaving the sounding board
free from any obstruction all substantially as set forth.