Year: 1887

page_text: Date of Application, 17th Aug., 1887
Complete Left, 17th May, 1888
Complete Accepted, 22nd June, 1888
1 JOHN CLARKSON YOUNG of Sankey Street, Warrington, Dentist do hereby declaro
the nature of the said invention to be as follows:-
The object of this invention is the improved construction of what are technically
known as pin pliers and which are used for punching holes at varying distances apart
for instance in the plates employed in the art of dentistry for backing teeth and for
other analogous purposes.
In performing my invention I employ the usual lever handles pivoted together in
the ordinary manner and the improvements rolate to the jaws and to the arrangement
for securing the punches in position in the one jaw and for enabling a broken punch
to be replaced.
Instead of screwing these punches into the jaw as heretofore I form the punches
each with a head at one end and so as to be capable of passing through the back of
the perforated jaw up to the head and then secured in position by a plate clamped
across the back of the jaw by two or more set-screws
The improvements in the other jaw consist in forming the same with a slot or recess
into which the metal plate or other article to be perforated or punched is placed and
there held whilst the punching operation is performed and which arrangement enables
the punches in the other jaw to be more easily and readily withdrawn from the
punched plate than heretofore.
These improvements particularly refer to that class of pin pliers by means of which
a pair of holes at varying distances apart can be punched simultaneously and consists
in mounting several sets or pairs of punches and at the required varying distances
apart in the same jaw and whereby the desired set of punches can be chosen so as to
perforate a plate with two or more holes and to the greatest nicety of adjustment.
In some cases I construct the punches in each set of varying length so that one
punch can pass through the plate before the other comes into operation and thus
I facilitate the punching process.
Dated this 16th day of August 1887.
JOHN G. WILSON,
Agent for the Applicant.

page_text: I JOHN CLARKSON YOUNG of Sankey Street, Warrington, Dentist do hereby declare
the nature of my said invention 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 the improved construction of what are technically
known as pin pliers and which are used for punching holes at variable distances
apart for instance in the plate employed in the art of destistry for backing teeth and
for other analogous purposes.
These improvements particularly refer to that class of pin pliers by means of which
a pair of holes at variable distances apart can be punched simultaneously and consist
as illustrated by perspective view Fig. 1 of the accompanying drawing in mounting
one or several sets or pairs of punches c c and at the required distances apart in the
same jaw and whereby the desired set or pair of punches can be chosen so as to
perforate a plate with two or more holes and to the greatest nicety of adjustment.
In some cases I construct the punches c c in each set of varying length so that one
punch can pass through the plate before the other comes into operation and thus I
facilitate the punching process.
To obtain the required punching power I employ the usual lever handles a a pivoted
or jointed together (or a thumb-screw may be substituted) and my improvements
relate to the jaws and to the arrangement for securing the punches in position in the
jaws and for enabling a broken punch to be readily replaced.
Instead of screwing these punches into the jaw bas heretofore I form the
punches c (as illustrated by separate view Fig. 2) each with a head at one end and
so as to be capable of passing through the back of the perforated jaw b up to the head
and then secured in position by a plate e clamped across the back of the jaw by two
or more set-screws ff.
Fig. 3 represents a side sectional view of the upper jaw b shewing the clamping"
arrangement.
The improvements in the other jaw g consist in forming the same with a slot or
recess into which the metal plate or other article to be perforated or punched is
placed and there held whilst the punching operation is performed and which arrange-
ment enables the punches in the other jaw to be more easily and readily withdrawn
from the punched plate than heretofore.
The action of my improved pin pliers may be described as follows
:-
The metal plate to be perforated is placed in the slotted recess h opposite the
selected pair of pins c c. At one effort and by simply closing together the handles a a
the two holes are punched the pins are then withdrawn and the backing instantly
liberated. The difficulty of separating without injury the perforated plate from the
pins, the greatest obstacle to punching two holes at once, is thus entirely removed.
The holes in intermediate plate i support and stiffen the pins c c and so reduce the
possibility of their breakage to a minimum.

page_text: In Figs. 4,
and 6 I illustrate a side and two plan views respectively of a modifi-
cation of my improved pin pliers-whereby the punches may be approximated or
separated and so the required distance of adjustment be obtained between such
punches so as to perforate a plate with two or more holes simultaneously and to the
desired nicety of adjustment.
In Fig. 5 the punches are shewn close together whilst in sectional plan view
Fig. 6 they are shown wide separated-it will be obvious however that any inter-
mediate position or distance can be adopted. The jaws in this case are retained open
and apart from the slotted recess by a "tuning-fork" spring action and are closed
together to effect the punching operation by simply pressing & lever o the short arm
of which is connected to the punching bar by a T headed pin por such pin could
be substituted by a thumb-screw.
In this case as in that of Fig. 1 the punches are similarly clamped in position by a
clamping plate but here the jaw is made in two parts land m one of which m turns
upon the other part 1 (on a pivot n) and thus is adjustable laterally.
Having thus particularly described and ascertained the nature of this my said
invention and in what manner the same may be performed I declare that what I
olaim is :-
1st. In pin pliers the improved mode of mounting and securing one or several sets
or pairs of punches in position in the one jaw and the use and application to the
other jaw of a slotted recess substantially as and for the purposes hereinbefore
described and illustrated.
2nd. The improved arrangements and constructions of pin-pliers for punching a
pair of holes simultaneously at variable and adjustable distances apart substantially
as and for the purposes herein before described and illustrated.
30
1000
JOHN G. WILSON,
55, Market Street, Manchester,
Agent for the Applicant.