NEW AND USEFUL IMPROVE- MENTS IN SAPE TIME LOCKS
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by Edward Griffith Brewer at the
Office of the Commissioners of Patents, with his Petition, on the
1st September 1875.-A communication from abroad by Patrick
Brien Hennessy, of Hamilton City, in the Dominion of Canada.
I, EDWARD GRIFFITH BREWER, of Chancery Lane, London, do hereby
declare the nature of the said Invention for "NEW AND USEFUL IMPROVE-
MENTS IN SAPE TIME LOCKS," (a communication to me from abroad by
Patrick Brien Hennessy, of Hamilton City, in the Dominion of Canada,
to be as follows :-
This Invention relates to improvements in safe or other locks used in
combination with a timed movement or arrangement of clockwork, by
the action of which the safe or other receptacle is prevented from being
opened until the expiration of a certain space of time previously
determined upon.
The principal parts of the apparatus are contained within a case which
is fixed upon the back of the safe or other door by means of bolts or
screws. In juxtaposition to this case one or any greater number of
sliding bolts are arranged opposite bolt holes formed in the side of the
safe or other receptacle, the said bolts being carried in suitable bearings,
and fixed to a sliding bar placed so as to be operated upon from the
outside by means of a kcy or latch. A stop or bar is also situate the
upon

page_text: said sliding bar so as to project towards and at times enter an orifice
formed in the end of the case herein-before referred to.
The mechanism within the case consists of ordinary clock movement
arranged in the most suitable part of the case and acting upon a shaft,
the end of which projects through the side of the case and carries a dial
plate, the face of which is marked off by figures into spaces representing
any desired degrees of time. A pointer is arranged in front of the dial,
so that when the hour at which the safe is required to be opened is fixed
upon either the dial or the pointer (according to the arrangement of
mechanism) is moved round opposite to the figure representing such
time.
The shaft which I have described as carrying the dial has also fixed to
it a notched disc, which at certain times acts upon a pin projecting from
an arm or lever so as to cause the said arm or lever to sink, and place a
pin at its outer end into another similarly notched wheel, which in
rotating slightly advances the arm or lever, and thereby releases a catch
and suffers a bolt (previously upheld in a horizontal position and opposite
to the bolt hole or orifice in the end of the case) to drop into an angular
position and away from the said orifice, allowing the entrance of the
herein-before described exterior bar, stops, or bolt, whereby the safe may
be unlocked, as the sliding bar carrying the bolts is thus allowed to be
shot back, and the bolts attached thereto drawn out of their holes or
sockets.
An arrangement is provided whereby the interior bolt is lifted to its
former position when the safe is again locked, the catch or pawl being
pushed inwards by a spring so as to fall into a notch or recess formed on
the boss or axis of the swinging interior bolt, and thereby prevent it
from falling until again released by the action of the clockwork
mechanism. A spring also presses upon the back of the arm or lever
actuated by the notched wheels so as to keep it against their peripheries.
The motive power of the clockwork is contained in a spring which it
is preferred to arrange so that the action of setting the pointer or dial
will also wind up the spring so as to give motion to the works and
bring about the results herein-before described.