IMPROVEMENTS IN LOCKS
Year: 1866

page_text: PROVISIONAL SPECIFICATION left by William Clark at the Office of
the Commissioners of Patents, with his Petition, on the 14th November
1866. A communication from abroad by Auguste Léon Genperat,
Architect, of 29, Boulevart St, Martin, Paris. "
I, WILLIAM CLARK, of 53, Chancery Lane, in the County of Middlesex,
Engineer and Patent Agent, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN LOCKS," to be as follows:-
This Invention relates to the application of a signal bell to latch and other
locks, whatever may be their arrangement, form, or dimensions, so as to give
warning when the handle or bolt is acted upon.
Figures 1, 2, 3, of the Drawings show the signal apparatus as applied to a
latch lock, while Figures 4, 5, and 6 show it as applied to a chain lock, the
arrangement of the latch lock is the same as in ordinary.
To the bolt B is adapted a small projection A, which when the bolt is shot
by turning the handle bears against a part C, so as to raise the piece D and
hammer G, and when the part C is released from the projection A. the spring N
acts on the part D carrying the hammer, causing it to strike the bell and give
the alarm or signal, the downward motion of the hammer stem being limited
by a small stud M.. On releasing the handle of the lock all the parts return
to the positions shown in the Drawing, which is effected as follows:-The part D
is mounted on pivots D', D³, Figure 2, and the part C earried by the pivot D
is provided with a space from H to J, enabling it to turn freely from H to K,
when it abuts against the stop D. When the bolt is again shot the projection A
causes part C to turn from H towards K, and presses it against the spring P

page_text: until part C escapes from A; the part C resumes the position occupied in
Figure 3 by the aid of the spring P, which slightly presses against the stop
of part D. A rib U is applied to strengthen the lock, having the necessary
opening to permit of the action of the parts A, C, and prevent their getting
out of position. The bell signal is fixed to a spindle rivetted to the movable
covering plate of the lock. An opening R, S, Figure 1, is-made in the outer
case of the lock for the emission of sound from the bell.
In Figures 4, 5, and 6, in addition to the parts before described, there is
shown a small stop piece T, serving to prevent the bell from sounding on
opening the lock; if desired piece T may be applied to all kinds of locks fitted
with these improvements. By placing a pin in the hole T¹ of the part T
(see Figure 6) and bringing the latter to bear on the part C it may be raised
and pressed against the spring P, so as to permit the part A to pass freely
without striking C, consequently the bell will not be sounded. If on the
contrary it is desired to sound the bell the part T should be turned towards
the bell, so that the part A may strike on C, and on turning the handle of the
lock the part C will be-free to act; and the bell be rung."
In the annexed Drawings Figure 1-shows a front view of a latch lock having
these improvements applied; Figure 2 a section on the line a, b, Figure 3;
Figure 3 a lateral section on the line. c, d, Figure 2.; Figure 4 shows an
outside view of a chain lock with bell apparatus; Figure 5, a section on the
line V, X, Figure 6, which is a lateral section on the line Y, Z, Figure 5.
The Invention consists in the application of signal bells to locks in the
manner described to give warning of their being opened without the necessity
of having a detached bell for that purpose.