Improvements in Pins for Pianoforte Strings and the like.
Year: 1894

page_text: Date of Application, 30th Apr., 1894-Accepted, 2nd June, 1894
COMPLETE SPECIFICATION.
Improvements in Pins for Pianoforte Strings and the like.
I, REGINALD HADDAN of the Firm of Herbert Haddan & Co. Patent Agents
of 18 Buckingham Street Strand W.C. London do hereby declare the nature of
this invention a communication to me from abroad by the Firm of Estela &
Bernareggi of Barcelona in the Kingdom of Spain Pianoforte Manufacturers,
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:—
This invention relates to the construction of the pins which are used for holding
and tensioning the strings or wires in pianofortes and other such instruments, and
it is applicable for modifications as hereinafter described to wooden string frames or
to metal string frames, or to the pin plates thereof.
The improvements consist in providing the pin for a wooden pin plate with a
conical enlargement next in front of the screw, and for a metal pin plate, with said
enlargement and also a counter nut of conical shape, the apices of the cones lying
towards each other. This conical nut may be a sleeve arranged to slide upon the
shank of the pin while prevented from revolving thereon and inay be pressed
forwards by a nut behind it. The hole through or into which the end of the wire
is passed or inserted is moreover according to the present invention made parallel
or substantially parallel with the axis of the pin, instead of passing transversely
through the same as heretofore.
In the annexed drawings
Fig. 1 represents a pin for wooden pin frames.
Fig. 2 shows a pin and its adjuncts for a metal frame and Fig. 3 represents the
method of securing it and them in said metal frame.
In Fig. 1 the pin is inserted with its end B in the hole in the pin frame and the
conical part A bears against the walls of the hole in the frame. If the pin becomes
loose a blow upon the end H will drive the conical part A into greater frictional
engagement.
The pins for metallic pin frames are shown in Fig. 2 and consist of the head H,
the conical part A, a prismatic part F and a screw threaded end B. Over the
prismatic part F there may be passed, after the pin is inserted, from the rear a
collar A' inwardly prismatic and outwardly conical; the narrower diameter being
nearest to the narrower diameter of the cone A. The nut E may then be screwed
onto the threaded end B of the pin so that by screwing up this nut the frictional
pressure between the cones A A' and the wall of the orifice in the plate may be
increased.
C represents the hole for the reception of the end of the wire D. This hole is
bored or otherwise made preferably in the base of the cone A where this base
projects beyond the surface of the head H of the pin. The hole is made in a
direction longitudinally of the pin. In winding the wire on this pin it will as
winding progresses lie further from the pin frame, whereas it the pin as formerly
made it was usual to wind the wire so that as winding continued it approached the
pin plate.
Having now particularly described and ascertained the nature of this said inven
tion, and in what manner the same is to be performed I declare that what I
claim is ;-
1. A pin having a cylindrical shank terminating in a conical enlargement A
whose base lies towards the exterior hood Hand

page_text: 2. A pin having a head H, a conical part A a prismatic or other part F for
reception of a sleeve, and a screw threaded end B, in combination with an inversely
directed conical sleeve A¹ and a nut E substantially as and for the purpose set
forth.
3. A pin having a wire receiving hole arranged longitudinally therein and A
opening at the side of the pin in the base of a cone A or in an equivalent collar
piece or otherwise for the purpose set forth.
R. HADDAN.