Year: 1887

page_text: Date of Application, 31st Aug., 1887
Complete Left, 17th Apr., 1888
Complete Accepted, 18th May, 1888
Invention communicated from abroad by JOHN THOMAS COLE, of Sydney, New South
Wales, Locksmith.
I, CHARLES AUBREY DAY, Fellow of the Institute of Patent Agents, of 321, High
Holborn, in the County of Middlesex, do hereby declare the nature of the said Inven-
tion, to be as follows:-
This Invention relates to certain improvements in or applicable to locks.
The especial object of the Invention is to prevent the lock from being unlocked by
means of its own key unless it be worked in a peculiar way, involving the turning of
the key first to a certain extent in one direction (say to the left), then in the reverse
direction, the key being inoperative in withdrawing the bolt if turned to any extent
only in either one of such directions.
To this end, the Invention consists essentially, in the application to lever locks of a
pivotted trigger-piece or its equivalent in such a manner as to be operative in with-
drawing the bolt when actuated by the said reverse turning movement of the key,
after the said trigger-piece has been set in position, and the lovers have been moved
into such a position as will permit of such withdrawal of the bolt, by the proper
extent of movement of the key in the said first direction.
In carrying the Invention into effect, the said trigger piece may be pivotted either
directly upon the bolt, or,, when a motion of the bolt independent of the trigger is
required, as in spring, trunk, pad and latch bolt locks, it may be pivotted upon a
separate sliding plate or piece working between side guides.
When it is required that the bolt in the former kind of locks should be shot, the
key is turned sufficiently round in either direction to remove the lever which detains
the bolt, or such unlocking movement of the lever may be effected by forming the lever:
with an extension with which is caused to engage an angular lifter pivotted in the
lock case, and which is operated by a push pin suitably mounted in the case and
normally kept in an inoperative position by a surrounding or contained spring.
1007
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicant.

page_text: Of Applicable to LOCKS.
Invention communicated from abroad by JOHN THOMAS COLE, of Sydney, New South
Wales, Locksmith.
I, CHARLES AUBREY DAY, Fellow of the Institute of Patent Agents, of 321, High
Holborn, in the County of Middlesex, do hereby declare the nature of the said
Invention 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 certain improvements in or
applicable to locks.
The Invention is illustrated on the accompanying drawings in two modifications of
its construction, one of which constituting a two lever latch-bolt lock is illustrated
in Figs. 1, to, 5; and the other of which constituting a four lever lock is illustrated in
Figs. 6, to, 12.
Figs. 1, to, 3, and, 6, to, 9, are inside elevations illustrating different positions of
the lock details, and will be hereinafter more particularly referred to.
Figs. 4, 5, and, 10, are transverse sections respectively through Fig. 3, on the
lines a, b, and, c, d, and through Fig. 6, on the line, e, f.
Figs. 11, and, 12, are detached views of the bolt and connected trigger in the
modification represented in Figs. 6, to, 12.
The especial object of the Invention is to prevent the lock from being unlocked by
means of its own key unless it be worked in a peculiar way, involving the turning of
the key first to a certain extent in one direction (say to the left), then in the reverse
direction, the key being inoperative in withdrawing the bolt if turned to any extent
only in either one of such directions.
To this end, the Invention consists essentially, in the application to lever locks of a
pivotted trigger-piece or its equivalent in such a manner as to be operative in with-
drawing the bolt when actuated by the said reverse turning movement of the key,
after the said trigger-piece has been set in position and the levers have been moved
into such a position as will permit of such withdrawal of the bolt by the proper extent
of movement of the key in the said first direction.
In carrying the Invention into effect, the said trigger-piece, 13, may be pivotted
either directly upon the bolt, 14, as represented in the modification illustrated in
Figs. 6, to, 12, or when a motion of the bolt independent of the trigger is required, as
in spring, trunk, pad and latch-bolt locks, it is pivotted upon a separate sliding plato
or piece, 15, working between side guides, 16, as represented in the modification
illustrated in Figs. 1, to, 5.
In the modification represented in Figs. 6, to, 12, the underside of the bolt, 14, is
cut away, (vide Fig. 12,) to permit of the free working of the trigger upon. the
pivot, 17, projecting from the bolt, and the latter is guided by its locking part, 18,
working through the front plate, 19, and by a bifurcated or slotted part, 20, engaging
with the centre pin, 21, of the levers, 22, 22x.

page_text: The bolt is shot (when the levers are in such relative positions as to permit of its
being actuated,) by a spring, 23, and it is withdrawn against the resistance of such
spring by means of the trigger-piece, 13, which is normally kept in the position
indicated in Figs. 6, 9, 11, by a spring, 24, but is moved in the said first turning
movement of the key from the position indicated in Fig. 6, to that indicated in Fig. 7.
in which all the levers, 22, 22x, are by the same movement of the key turned into
such positions as to allow of the bolt being withdrawn.
In Fig. 7, the key is represented as having been turned almost but not quite to its
intended full extent, and it will be seen that if the movement of the key were now
reversed the trigger-piece and levers would be caused by their respective springs, 24,
and, 25, to resume the relative positions indicated in Fig. 6, but upon the turning
of the key being continued in its said first direction to its intended fullest extent of
movement, vide, Fig. 8, the point, 26, of the trigger-piece, 13, is caused by its
spring, 24, bearing against an extension, 27, of the trigger-piece to slip past the end
of the key, the movement of the trigger-piece being, however, immediately arrested
by its point, 28, catching against the opposite side of the key, vide Fig. 8, in which
the three front levers, 22, occupying the same positions as those represented in Fig. 7,
are shown as removed, and the key is then caused to engage in the concavity of the
trigger-piece between such two points, 26, and, 28, thereof.
Now, if, while the key remains engaged in such concavity of the trigger-piece, it
be reversed in its movement, such movement of the key will cause the bolt to be
withdrawn, whereupon the parts assume the relative positions illustrated in Fig. 9, the
three levers, 22, being caused to remain in the positions illustrated in Fig. 7, by
reason of the projecting piece, 29, of the bolt, engaging in the slots, 30, which may be
open or closed as in Figs. 1, and, 2, but a lateral extension of the slot, 30, in the under
lever, 22, (the one represented in Figs. 8, and, 9,) allows of such lever at the com-
pletion of such movement being returned by its spring, 25, over the said lock
piece, 29, vide Fig. 9, and thus causes the bolt to be retained against the pressure of
the spring, 23, when the key is removed.
When it is required that the bolt should be shot, the key is again inserted and
turned sufficiently round in either direction to remove the lever, 22x, from the position
illustrated in Fig. 9. to that illustrated in Fig. 8. which permits of the bolt being shot
by its spring, 23, or, such unlocking movement of the lever, 22*, may be effected by
forming the lever with an extension, 31, with which is caused to engage an angular
lifter, 32, pivotted at, 33, in the lock case, 34, vide Fig. 10, and which is operated by
a push pin, 35, suitably mounted in the case and normally kept in an inoperative
position by a surrounding or contained spring, 36, the arrangement being such, that
upon the pin being pushed in by the hand, the lifter, 32, is caused to move the
lever, 22× from the position illustrated in Fig. 9, to that illustrated in Fig. 8, which
permits of the spring, 23, shooting the bolt, 14, carrying with it the trigger-piece, 13,
to the position illustrated in Fig. 6, and thus permitting of the levers, 22, 22x,
resuming the positions represented in such Fig.
If the said first movement of the key had been continued sufficiently far to allow of
the escape of the point, 28, of the trigger-piece past the end of the key, it would not
have been possible to have withdrawn the bolt by reversing the movement of the key,
the trigger-piece thus permits of the key being turned to any extent in either direction
without being effective in withdrawing the bolt, the spring, 24, of the trigger-piece
bearing against its extension, 27, or, 36, after.each passage of the key, and returning
the trigger-piece to the position illustrated in Figs. 6, 9, 11, without the bolt being
actuated.
In such locks wherein it is also required that the bolt should be capable of closing
into its case without being operated by the key, such as when shutting a door fitted
with a latch-bolt lock, but wherein it is only intended that the bolt should be unlocked
in the manner hereinbefore described as in the modification represented in Figs. 1,
to, 5, this is provided for by pivotting the trigger piece, 13, at, 17, upon a separate
sliding plate, 15, which works between the side guides, 16, which protect the bolt and
trigger carrier plate from being picked, the underside of the bolt being cut away

page_text: (vide Figs. 4, and, 5,) to permit of the free movement of the said plate and trigger-
piece. In such modification, the plate, 15, is adapted with the said locking piece, 29,
which engages with closed locking slots, 30, in the levers, 22, and also engages with a
slot, 37, made in the bolt, 14, in the direction of its movement, so that the plate, 15,
and bolt, 14, can only be withdrawn when the levers are in such positions as will
permit of the movement of the piece, 29, and connected plate; the bolt is also
slotted at, 35, for the accommodation of the adjacent side guide, 16, which, if carried
sufficiently high, is slotted, as at, 39, vide Fig. 4, to permit of the movements of the
trigger piece and of the part of the key actuating it.
The operation of such modification in unlocking the bolt is substantially the same
as that hereinbefore described with reference to the modification illustrated in Figs. 6,
to, 12, the trigger-piece being actuated in the same manner, and operative in with-
drawing the bolt by means of the slide-piece, 15, and projecting part, 29, engaging
with the bottom end of the slot, 37, in the bolt.
When the bolt is withdrawn, it can be relocked upon releasing it from the levers, 22,
by turning the key sufficiently in either direction, and if it is shot before the door is
closed it will close again into its case as the door is closed, and will then be reshot by
its spring, 23, and can then only be unlocked by the aforesaid manipulations of the
key.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The application to lever locks of a pivotted trigger piece or lever in such a
manner as to be effective in preventing the bolt from being withdrawn by means of
the key of the lock unless the key be worked in a peculiar way involving the turning
thereof firstly to a determined extent in one direction for setting such means in
position for actuation in withdrawing the bolt and for setting the levers of the lock
into such a position as will permit of the withdrawal of the bolt, and then to a
sufficient extent in the reserve direction, such trigger piece or lever being also
applied in such a manner as to be operative in withdrawing the bolt upon being
actuated by such reverse turning movement of the key substantially as hereinbefore
described.
2. In combination with the bolt, 14, a trigger piece or lever, 13, pivotted thereon
and adapted to be operated by the key of the lock, and to be effective in its operation,
substantially as hereinbefore described, and a spring, 24, for automatically returning
the trigger piece to its normal position.
3. In combination with the bolt, 14, a trigger piece, 13, pivotted upon a separate
sliding plate, 15, working between side. guides, 16, such parts being adapted to be
operated and to be effective in their operation, substantially as hereinbefore described,
and a spring, 24, for automatically returning the trigger-piece to its normal position.
4. The formation of the lever, 22×, adapted with a lateral extension of the slot, 30,
for causing the bolt to be retained when withdrawn, with an extension, 31, and the
use in combination therewith of the pivotted angular lifter, 32, and of the push pin
arrangement, 35, for releasing the bolt from the control of such lever when required
to be effected without using the key so that the bolt may be shot by its spring, 23,
substantially as hereinbefore described.
1 1
1
L 1000
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicant.