IMPROVEMENTS IN LOCKS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said Matthew Gilmour at the
Office of the Commissioners of Patents on the 11th May 1882.
MATTHEW GILMOUR, of Paisley, in the County of Renfrew, North Britain, Smith,
'IMPROVEMENTS IN LOCKS
"
This Invention which relates to Improvements in Locks has reference more
"Stock and Plate," and
especially to that class of Locks ordinarily known as
"draw back chamber locks."
The improved locks consist of a stamped plate with three oblong holes in it for
the bolt of the lock to slide through. The bolt has a slit hole in it with a notch
on the side of the hole for the catch of the tumbler The spring and tumbler are
made of one piece and fixed to the stamped plate at one end by a stud, and the
other end is bent down and works through the slit hole in the bolt by turning the
key. The utility and durability of this Invention consists in all the parts being
fixed to the stamped plate, and the tumbler and spring being combined in one
piece and working through a slit hole in the bolt, by turning the key in the act of
locking and unlocking, the bolt cannot be thrown out of place.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Matthew Gilmour in the Great Seal Patent Office on the
30th September 1882.
MATTHEW GILMOUR of Paisley in the County of Renfrew, North Britain, Smith.
"IMPROVEMENTS IN LOCKS
39
"
My said invention which relates to improvements in locks has reference more
especially to that class of locks ordinarily known as Stock and Plate" and "draw
back chamber locks."-The improved locks consist of a stamped plate which holds
together the whole of the locking mechanism so that the said mechanism and plate
can be separated from the stock as one piece.
The said stamped plate has three oblong holes or slits in it for the bolt of the
lock to slide through.
The bolt has a slit hole in it with a projection on the side of the hole for the
catch of the "player."
"
The spring and " player are made of one piece and fixed to the stamped plate
at one end by a stud and the other end is bent down and works through the slit
hole in the bolt by turning the key:-
And in order that my said invention may be properly understood I will now
proceed to set forth the system, mode, or manner in or under which the same is or
may be used or practically carried into effect reference being had to the annexed
Sheet of Drawings and to the letters and Figures marked thereon, that is to say:
Figure 1, of the accompanying drawings represents a front elevation, partly in
section, of a lock constructed according to my said invention with the stock or
mounting removed to shew the parts more clearly.
Figure 2, is a plan or edge-view of the lock (corresponding to Figure 3) with the
wooden stock in section.
Figure 3, is an elevation of the opposite side to that shewn in Figure 1, the lock
in this Figure being shewn within its wooden stock.
"
Figure 4, relates to a " draw back chamber lock and is hereinafter referred to.
In Figure 1, the side of the lock which is shewn would in use be covered by the
body of the stock S, Figures 2, and 3; the said stock being preferably of wood and
hollowed out on one side for the reception of the lock, as shewn in Figure 2.-The
plate A, is stamped into the form shewn more particularly in Figures 2, and 3.
Figure 2, shewing the particular form given in edge-view and Figure 3, shewing
the plate in side view.
"
The stamped plate A, is formed with three oblong holes a, a', a², the hole a,
having passed through it the end of the bolt C, furthest from the locking end c, of
the said bolt, and also receiving through it the part of the " player" spring D,
nearest the stud d, to which the spring or player is secured; the hole a²,
receiving through it the main body of the bolt C, together with the two extremities
d', d², of the spring and " player" respectively and the hole a², receiving the
locking extremity c, of the bolt C; the bolt and spring are thus held together
side by side within the contours of the stamped plate as seen more particularly in
Figure 2.
In Figure 1, the top of the hollow formed by the part a³, (Figures 2, and 3,) of
the plate A, is shewn cut off to enable the parts otherwise hid by this part of the
plate to be seen in full lines.-The plate A1, Figure 2, is a detached portion corre-
sponding to the part a³, the plate having an aperture through it corresponding to
the aperture a, Figure 3, of the part a³, to receive the key.
The bolt C, is formed with a slit hole c¹ through it, the said hole having a pro-
jection c³, on its side which projection forms two recesses or knotches at the sides

page_text: of the said projection to receive the catch d³, of the "player" d², which is also a
part of the spring D.-The stud d, from which the spring and "player" works, is
fixed in the stamped plate, the free ends of the springs, that is to say the
"player", and the spring portion d¹, are bent down and work through the slit
hole a, in the stamped plate, the end of d', bearing against the edge of the hole a',
as shewn more particularly in Figure 1, the "player" d², being sprung within
either one or the other of the notches at the side of the projection c², formed in
the bolt.
I will now proceed to describe the action of the lock when in use.
Upon inserting the key K, within the front side of the lock as in Figure 1, the
stem of the key is caused to be centered upon the plate E, which is fixed across
the hollow as, of the stamped plate. Upon turning the key towards the locking
end c, of the bolt, the cam portion k, of the key is caused to raise up the
player" d, and when in its highest position the cam k, of the key is within the
notch c³, formed in the edge of the bolt, and upon further continuing the turning
of the key the cam k, is forced against the side of the notch c³ and moves along
the bolt C, the catch d³, of the "player" having meanwhile been raised out of one
of the recesses at the side of the projection c³, and raised above the said pro-
jection. Upon completing the turning of the key, the cam k, has moved the bolt
along to its full extent and the catch d³, has fallen or has been sprung into the
notch at the opposite side of the projection c², the position assumed now by the
various parts of the locks being shewn in the drawing.
"
In Figure 4, I have shewn a side view of the bolt applied to & draw back
chamber lock."
In this modification of my invention, in order to render the bolt C¹, capable of
being operated by hand, I form the back extremity of the bolt or that extremity
which passes through the hole a, of the stamped plate with a "burn" c¹, so as to
form a handle piece which can readily operate the bolt, and I form the pro-
jection c*, of a wedge-shape so that the catch d*, of the "player" may be forced
from one side to the other of the projection c2*, upon pushing the bolt to one side
with the hand, the inclination of the projection c2*, taking the place of the cam kc,
of the key to raise the "player."-In Figure 3, I have shewn the stamped plate A,
screwed to the wooden stock S, and lying within a recess in the said stock but the
plate may be mounted in any other convenient manner.
وو
In the modification of my improvements as applied to a "draw back chamber
lock as shewn in Figure 4, the bolt C¹, is operated in combination with the
stamped plate A, and the lock works in a precisely similar manner to the locks
shewn in Figures 1, to 3, the only alteration that is necessary being the shape of
the projection c*, and the construction of the end of the bolt with a handle piece
in lieu of operating the bolt by a key.
The utility and desirability of my improved locks consist more especially in all
the parts being fixed to the stamped plate A, and the "player" and spring being
combined in one piece-the catch of the " player" working in a slit hole in the
bolt whereby in turning the key in the act of locking and unlocking, the bolt
cannot be thrown out of place.
Having now described and particularly ascertained the nature of my said
invention and the system, mode, or manner in or under which the same is or may
be used or practically carried into effect I would observe in conclusion that the
herein before described improvements in "Stock and Plate" and "draw back
chamber locks" may be slightly varied in many ways without departing from the
features of my Invention for instance it is not essential that the entire working
parts of the locks should be fixed to the stamped plate although I prefer that they
should be so arranged and I would also observe that I have only shewn those
parts of the lock which are essential to the proper understanding of my improve-
iments; but what I consider to be novel and original and therefore claim as the
invention secured to me by the hereinbefore in part recited Letters Patent is,
First In the construction of "Stock and Plate" and "draw back chamber

page_text: locks" the employment of a plate A, so shaped or stamped and formed with slit
holes as to hold together the working parts of the lock substantially as herein before
described and shewn in the accompanying drawings.
Second-The construction of the "player" and spring in one piece in combi-
nation with the plate A, substantially as herein before described and shewn in the
accompanying drawings.
Third The construction of the bolt with a slit hole c', and projection c², or c²*,
formed therein to receive the catch of the "player," the said parts of the lock
operating in combination with the stamped plate A, substantially as herein before
described and shewn in the accompanying Drawings.
In Witness Whereof, I, the said Matthew Gilmour have hereunto set my
hand and seal this twentieth day of September in the year of our Lord,
One thousand eight hundred and eighty-two.
MATTHEW GILMOUR. (L.S.)