Year: 1886

page_text: Date of Application, 12th Apr., 1886
Complete Left, 11th Jan., 1887.
Complete Accepted, 11th Feb., 1887.
ARTHUR TREADWIN TUCKER 55 Gt. Russell St. London W.C. Lock Safe and Strong
Room Manufacturer do hereby declare the nature of my said invention to be as follows:-
My invention consists in making padlocks, latches, and other locks, without any
external shackle or projecting bolts. This improvement is produced in a padlock, by
so fitting the lock to the staple, that the hasp of staple passes through either the back
or top of lock, and the bolt, by action of the key, (or spring if it be a spring lock)
passes through the hasp & thus secures it.-I make the bolt work either by a whole
or partial revolution, or with a horizontal or vertical action, and I make the staple in
such a manner, (should I choose) to enable the lock to revolve, so that should any
obstacle come into violent contact with it, the resistance, offered by padlocks constructed
in the ordinary way, would thus be avoided.
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By making spring locks & latches without any obtruding bolts, I avoid the sharp
edged bolts of ordinary locks, which so often do damage to the clothes of passers by.
I arrange the bolts of these locks, when carried back either by the key or door handle,
so that they retire into the lock, and there remain until brought into action by closing
the door, when another bolt, also flush with the "face plate or fore end of the
lock comes into communication with a slightly raised' part on the "striking plate,"
thus releasing the larger bolt and allowing it to advance.
This I effect by making the bolt in such a manner as to communicate with a spring
bolt, but only when the spring bolt is brought into action; on this taking place, the
< detainer" and allows the principal bolt to advance.
spring bolt releases a
"Dead
locks with flush bolts may be made on the same principle so that they will securely
lock themselves, without the aid of a key, and the bolt cannot be drawn back again
unless unlocked by the key. This may be produced by using either one or a further
number of bolts.
When the lock is latched, the follower is free to act by itself, but when locked, it is
fixed and immovable, thus reducing wear and friction, to a minimum.
ARTHUR TREADWIN TUCKER.

page_text: Improvements in Locks and Latches.
I, ARTHUR TREADWIN TUCKER of 55 Gt. Russell Street, London, W.C. Lock, Safe
and Strong Room 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 :-
My invention consists in making latches and other locks without any externally
projecting bolts, thus avoiding the projecting. sharp edged bolts of ordinary locks and
latches, which are apt to damage the clothes of passers by.
I arrange the bolts of locks so that when they are drawn back by the. key or door
handle entirely within the lock they are held in that position while the door remains
open but, in closing the door, another bolt, which, like the main bolt, does not project
beyond the face plate, comes to bear against a slightly raised part on the striking plate
and is thus moved, releasing a detent and so allowing the main bolt to advance and
become engaged in the striking plate.
The accompanying drawings represent the construction of a spring latch lock
according to my invention. Fig. 1 shews the position of the parts when the latch bolt
is retracted, the door being open; Fig. 2 shews their position when the latch bolt is
engaged in the striking plate, the door being closed.
The latch or main bolt A which is urged forwards as usual by a spring B is made
with a lower limb A¹ on a notched part of which engages a detent lever C. This
detent lever is connected by a free joint to a spring bolt D the front end of which d
presents itself in a hollow of the face plate E but does not project beyond the face
plate. From the striking plate F projects a rounded raised part which is preferably
made as the end of a screw as shewn in Fig. 2, so that it can be adjusted to project.
more or less to suit the clearance space between the face of the door and the jamb.
On closing the door, the projection acting on the end of the spring bolt D
pushes D back and thus raises the arm of out of the notch of A', whereupon the
spring B causes the bolt A to advance and engage in the striking plate F. For
opening the door, the bolt A can be retracted either by turning by means of the handle
the follower G, or by the key K engaging in the front notch of the locking bolt H.
When the bolt A is retracted and the door is opened, the spring bolt D being then free
to advance, the detent Cagain engages with the notch of A¹, and the bolt A is thus
held back, no part of it projecting beyond the face plate E. For the purpose of
locking the door, there may be a separate locking bolt as in ordinary mortice locks,
but, for simplicity of construction and action, I prefer to use an internal bolt H as
shewn, providing it with tumblers in the usual way to be worked by a key K. When
the key
turned in the one direction the bolt H is moved forward and its front end
at Hthen bearing against the shoulder of the main bolt A prevents that bolt from
being retracted and consequently keeps the door locked. The same bolt H being
moved back by the key engaging in its front notch h, acting on the shoulder H2 of the

page_text: main bolt A, serves to retract the bolt when there is no door handle or when the handle
is removed. I prefer to make the follower G act on a projecting part A of the main
bolt A so formed that when the bolt is advanced as shewn in Fig. 2 and locked, the
follower G is held stationary and cannot be worked to and fro, and thus the wear
resulting from attempts to open the locked door by turning the handle, is avoided.
Although I have shewn in the drawings a construction suitable for a mortice lock,
obviously a similar arrangement of main bolt and detent may be used in locks of other
forms. Also dead locks may thus be made with bolts that become automatically
advanced by the closing of the door and keep it locked until the bolt is retracted
by a key.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim, in
respect of locks and latches, is :—
In combination with the main bolt urged forwards by a spring, a detent holding the
bolt back when the door is open, but released by a projection on the striking plate in
the act of closing the door, substantially as and for the purpose herein set forth.