IMPROVEMENTS IN PIANOFORTES be ass
Year: 1884

page_text: I ISAAC GRINDROD of 240 Entwisle Road Rochdale in the County of Lancaster
Watchmaker do hereby declare the nature of my invention for "IMPROVEMENTS
IN PIANOFORTES to be as follows:
"
My invention consists of an improved apparatus for the attachment of the strings
to the metal wrest plate or plank of pianofortes or other such like instruments
admitting of the use of a wire for each note of greater size whereby a
permanent and uniform tension is obtained than heretofore, consequently resulting
in the production of a much superior volume of tone.
more
My arrangement consists of a metal wrest stud or peg one part having a screw
thread thereon which is fitted at right angles to the wrest plate or plank, or; if
desired may be cast with the wrest plate, the other part which projects from the
front of the wrest plate or plank is provided with an aperture for the reception of
a triangular, rectangular, elliptical, or other shaped metal pin or sliding piece
having a screw thread thereon being fitted at right angles to the, wrest stud or
peg and allowed to work or slide freely through the aperture, and is adjusted to
any desired tension by means of a hexagon or other shaped nut on the outer
extremity of the wrest stud or peg, the string or wire is fastened or attached to
one end of the metal pin or sliding piece viz. opposite the end operated upon by
the hexagon or other shaped nut, being secured at its other extremity to the pin
or peg on the block or plate as heretofore as is well understood, It will be
obvious from the above description that my arrangement, is applicable to
pianofortes or other such like instruments where strings or wires are applied in
an oblique, vertical or horizontal position; and having a continuous pull on the
string or wire in the direction of its length, thus obviating the tendency of the
string or wire, to slip or relax, in consequence of the wrest pin or peg turning
round in its bearing as is well known to be the case with strings or wires attached
to the wrest plate or plank as heretofore, thus dispensing with the frequent
application of the tuners' key.
Dated this first day of January one thousand eight hundred and eighty four.

page_text: I ISAAC GRINDROD of Number 240 Entwisle Road in the Borough of Rochdale
and County of Lancaster Watch Maker do hereby declare the nature of my
Invention for "IMPROVEMENTS IN PIANOFORTES" and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:-
My invention consists of an improved apparatus for the attachment of the
strings or wires to the metal wrest plate or plank of pianofortes or other such
like instruments admitting of the use of a wire for each note of greater size
whereby a more permanent and uniform tension is obtained than heretofore
consequently resulting in the production of a superior volume of tone.
My arrangement consists of a metal wrest stud or peg one part having a screw
thread thereon which is fitted at right angles to the wrest plate or plank or if
desired may be cast with the wrest plate the other part which projects from the
front of the wrest plate, or plank is provided with an aperture for the reception
of a triangular rectangular, elliptical or other shaped metal pin or sliding piece,
having a screw thread thereon being fitted at right angles to the wrest stud or
peg, and allowed to work or slide freely through the aperture, and is adjusted to
any desired tension by means of a hexagon or other shaped nut on the outer
extremity of the wrest stud or peg, the string or wire is fastened or attached to
one end of the metal pin or sliding piece viz. opposite the end operated upon by
the hexagon or other shaped nut being secured at its other extremity to the pin
or peg on the block or plate as heretofore as is well understood.
Another modification of this invention consists of an arrangement for adjusting
the tension on the string or wire consisting of a pin, having a screw thread
thereon, at its bottom extremity is a swivel piece to which the wire or string
is attached, its other extremity is prepared to receive a key which operates the
same thus dispensing with the nut, the pin being circular and working in the
wrest stud.
It will be obvious from the above description that my arrangement is applicable
to pianofortes or other such like instruments, where strings or wires are applied in
an oblique, vertical, or horizontal position, and having a continuous pull on the
string or wire in the direction of its length, thus obviating the tendency of the
string or wire to slip or relax in consequence of the wrest pin or peg turning
round in its bearing as is well known to be the case with strings or wires attached
to the wrest plate or plank as heretofore thus dispensing with the frequent
application of the tuners' key.
In order to enable my invention to be better understood I will proceed to describe
the same by reference to the annexed sheet of drawings similar letters of reference
indicate like parts throughout the drawings.
Fig. 1 represents the sectional end view of the upper portion of a pianoforte
shewing the wrest plate or plank with my arrangement attached thereto figs. 2.
and 3. are views shewing the arrangement and position of the studs on the wrest
plate or plank figs. 4. 5. and 6. are sectional elevations and plan respectively of
my invention on a large scale, the latter figure represents my modification.
The wrest stud B is fitted into the wrest plank or plate C. which is provided
with an aperture D through which the pin or sliding piece E has a free passage
during its adjustment by the nut F on the outer extremity of the wrest stud B.
The pin or sliding piece E is of rectangular, triangular, elliptical or other suitable
shape, the aperture D in the wrest stud B being of corresponding form the object
of which is to prevent the pin from turning round during the operation of effecting

page_text: a tension on the wire G thus preventing the twisting of the wire during such
operation, the wire G passes over the bridge H and is secured to the pin on the
bottom block or plate as heretofore, thus having a continuous and permanent pull
on the wire a uniform tension is obtained.
My apparatus may be applied to the wrest plate or plank in any number and
in various positions so as to obtain a greater length of string or wire as shewn in
figs. 2. and 3. the same being screwed into the wrest plate or plank or if desired
may be cast with the metal wrest plate and admits of the use of a wire for each
note of greater size than is possible to be applied to pianofortes as heretofore
constructed it is consequently manifest that by the use of a heavier wire a greater
volume of tone can be produced.
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. An improved apparatus attached to the wrest plate or plank of pianofortes
or other such like instruments consisting of the nut F. the wrest stud B. and the
pin or sliding piece E. for the purposes herein set forth and substantially as
described in the annexed drawings.
2. An improved apparatus attached to the wrest plate or plank of of pianofortes
or other such like instruments consisting of a pin. 1. having a screw thread thereon"
and a swivel piece J, at its bottom extremity for the purposes herein set forth and
substantially as described in the annexed drawings.
Dated this 28th day of January one thousand eight hundred and eighty four
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