Improvements in or connected with Means or Devices for Sustaining and Adjusting the Tension of Wires of Pianofortes and like Instruments.
Year: 1897

page_text: Date of Application, 27th May, 1897
Complete Specification Left, 16th Feb., 1898-Accepted, 26th Mar., 1898
PROVISIONAL SPECIFICATION.
Improvements in or connected with Means or Devices for Sustaining
and Adjusting the Tension of Wires of Pianofortes and like
Instruments.
We, JOHN HENRY PAPPS and LOUIS FRANK PAPPS, both of 105, St. James' Road,
Southsea, in the County of Hants, Cycle Agents and Pianoforte and Organ
Manufacturers, Tuners, and Repairers, and THOMAS HARRISON, of 202B, Uxbridge
Road, Shepherd's Bush, in the County of London, Pianoforte and Organ
Manufacturer, do hereby declare the nature of this invention to be as follows:
In the manufacture of pianofortes anil like instruments it is a common practice
to employ a heavy beech plauk to receive the "Wrest pins," which are driven into
holes in such plank, this arrangement has many disadvantages, and the object of
our invention is to provide improved means whereby the wrest pins are securely
held, and readily capable of being adjusted.
According to our invention we employ wrest pins of cylindrical form having one
end squared, or polygonal so as to receive a key, and the opposite end thereof
preferably rounded. The framework of the pianoforte is formed with a rear metal
plate having a number of holes, into which the rounded ends of the wrest. pins
fit. A front plate is provided in which are formed a number of apertures located
directly in front of the before-mentioned holes formed in the rear plate; the.
apertures in the front plate are wider at the top than at the bottom and are of
elongated formation, their longest axis being in a line with the pull of the wire.
The wrest pins pass through the apertures in the front plate and as before stated
take into the holes in the rear plate..
Thus the wrest pin is free to turn, and also move radially in a vertical direction
about the holes in the rear plate.
A pianoforte wire is attached to the wrest pin beyond and in front of the front
plate, and upon turning the wrest pin the wire is tightened and the wrest pin is
pulled downwardly in the tapered slotted aperture of the front plate,
the sides of the tapered aperture gripping the wrest pin, and thus preventing
the pin from turning back after the wire has been tightened.
Dated this 27th day of Mov 1807
BREWER & SON,
London and Leeds, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or connected with Means or Devices for Sustaining
, and Adjusting the Tension of Wires of Pianofortes and like
Instruments.
We, JOHN HENRY PAPPS and LOUIS FRANK PAPPS, both of 105, St. James' Road,
Southsea, in the County of Hants, Cycle Agents and Pianoforte and Organ

page_text: Manufacturers, Tuners, and Repairers, and THOMAS HARRISON, of 202B, Uxbridge
Road, Shepherd's Bush, in the County of London, Pianoforte and Organ
Manufacturer, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly' described and ascertained in and
by the following statement:-
-
In the manufacture of pianofortes and like instruments it is a common practise
to employ a heavy beech plank to receive the "Wrest pins" which are driven into
holes in such plank, this arrangement has many disadvantages, and the object of
our invention is to provide improved means whereby the wrest pins are securely
held and readily capable of being adjusted.
Our invention will be readily understood by the following description having
reference to the accompanying drawings, where Fig. 1 shews in vertical transverse
section, taken on the line X Y of Fig. 3, shewing so much of the framework of a
pianoforte with a wrest pin in position, as will be necessary to explain our inven-
tion. Fig. 2 is a rear elevation of the parts shewn at Fig. 1, taken in the direction
of the arrow Fig. 1, and Fig. 3 is a front elevation of Fig. 1, taken on the
line X2 Y2 of Fig. 1. Fig. 4 is a view similar to Fig. 1, but shewing a somewhat
modified arrangement. Fig. 5 is a vertical sectional elevation on the line X¹ Y¹
of Fig. 4, taken in the direction of the arrow in the latter figure, and Fig. 6 is a
front elevation of the parts shewn at Fig. 4.
According to our invention we employ wrest pins A of cylindrical form, in
some cases finely serrated, having one end A¹ squared or polygonal so as to receive
a key, and the opposite end thereof A³ preferably rounded. The framework of the
pianoforte is formed with a rear plate B having a number of holes C into which
the rounded ends of the wrest pins fit. The holes C may extend wholly or partially
through the plate B, in the former case, as illustrated in Fig. 1, and in the latter
as at Fig. 4, in which latter case the base of the hole C limits the end way move-
ment of the wrest pin A, should undue pressure be put upon it, when applying a
key. Or any suitable checks may be arranged to limit the lateral movement of
the wrest pins.
A front plate D is provided in which are formed a number of apertures E located
directly in front of the before-mentioned holes C; the apertures E in the front
plate 1), best seen at Fig. 3, are wider at the top than at the bottom and are of
elongated formation, their longest axis being in a line with the pull of the wire.
The wrest pins A pass through the apertures E in the front plate D), and as
before stated take into the holes C, in the rear plate B.
Thus the wrest pin A is free to turn and also move radially in a vertical direction
about the holes C in the rear plate B.
A pianoforte wire F is attached to the wrest pin A beyond and in front of the
front plate D, and upon turning the wrest pin A the wire F is tightened, and the
wrest pin A is pulled downwardly in the tapered slotted aperture E of the front
plate D, the end A being in the holes C is prevented from rising, the sides of the
tapered apertures E gripping the wrest pin A, and thus preventing the pin from
turning back after the wire has been tightened.
Thus it will be seen, that by our invention, the wrest pins may be placed in
position without requiring to be driven or forced, and are loose when in position,
until the wire is tightened; in a similar manner they may be readily taken out
after having loosened the tension of the wire.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we declare that what we
claim is:-
1. The means or devices herein described for sustaining and adjusting the
tension of the wires of pianofortes and like instruments by constructing the frame-
work thereof with a front supporting portion or plate having tapered slotted
apertures therein, in combination with a back portion or plate formed with
apertures, to receive cylindrical wrest pins, whereby the strings when tightened,

page_text: pull the wrest pins downwardly into the tapered apertures in the front plate in
which the pins are gripped, and thereby preventing the pins from turning after
the tightening of the wires, as set forth.
2. The general construction and arrangement of parts composing the improved
means or devices for sustaining and adjusting the tension of wires of pianofortes
and like instruments, substantially as and for the purposes described and illus-
trated with reference to the accompanying drawings.
D
4
BREWER & SON,
London and Leeds, Agents for the Applicants.
BREWER & SON,
London and Leeds, Agents for the Applicants.