Year: 1888

page_text: Date of Application, 2nd Mar., 1888
Complete Specification Left, 3rd Dec., 1888
Complete Specification Accepted, 2nd Mar., 1889
We FRANK SMITH and CHARLES GRAY SMITH of Deritend Bridge Works
Birmingham, Locksmiths and Art Metal Workers do hereby declare the nature of
this invention to be as follows:-
-
Our invention relates in the first place to an improved method of moving the bolt
of a lock backwards and forwards with great ease and without the intervention of a
spring, also in such way that the bolt is rendered immoveable at each end of its
travel. For this purpose we employ a cam of suitable shape which acts upon
projections or apertures in or upon the bolt, in such way as to propel or withdraw the
bolt and to fasten it either in the shot or unshot position. The said can is actuated
by a spindle and handle of the usual form or by a spindle terminating in a cross-
handle and as this only requires to be revolved a quarter of its circular travel to move
the bolt to the full extent either backwards or forwards, the said cross handle indicates
from the outside the position of the bolt. Or an indicator of suitable shape may be
affixed to the spindle so as to show the position of the bolt on a graduated plate
affixed to the outside of the lock. Our second improvement consists of a detent or
release to be acted upon by a key and which detent or release is inaccessible
This detent is for the purpose
from the outside of the lock or by any other means.
Our third
of preventing the bolt of a lock, acting with a spring from being shot.
improvement relates to an improved form of the front plates of locks through which
the bolts of the same pass, with especial reference to locks used for the doors of
Lunatic Asylums and similar places where it is important to keep the locks from
being tampered with. We make the said front plate of the lock with a projecting
piece which projects at right angles from it, and which, in conjunction with a rebated
striking plate effectually prevents the bolt of the lock from being moved by a knife
or other instrument from the outside.

page_text: Improvements in Locks and Bolts.
We FRANK SMITH and CHARLES GRAY SMITH Locksmiths and Art Metal Workers
Deritend Bridge Works Birmingham in the County of Warwick 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 :-
Our invention relates in the first place to an improved method of moving the bolt
of a lock either backwards or forwards with great ease, without noise, and without
the intervention of a spring, also in such way that the bolt is locked or rendered
immoveable at each end of its travel. For this purpose we employ a cam of suitable
shape which acts upon projections upon the bolt in such way as to propel or with-
draw it when the cam is revolved and also to fasten it either in the shot or unshot
position. The said cam is actuated by a spindle and handle of the usual form or by
a spindle terminating in a cross handle, and as the handle only requires to be revolved
a quarter of its circular travel to move the bolt to the full extent either backwards
or forwards, the said cross-handle indicates from the outside the position of the bolt.
Or an indicator of suitable shape may be affixed to the spindle so as to show the
position of the bolt on a graduated plate affixed to the outside of the lock.
Our second improvement consists of a detent or release to be acted upon by a key
and which detent or release is inaccesible from the outside of the lock or by any
other means.
This detent is for the purpose of preventing the bolt of a lock which
acts with a spring from being shot, and we accomplish this object by means of a
suitably shaped cam working upon a pivot and propelled by a spring in such way
that one extremity of it fits into a properly shaped recess in the bolt of the lock
when the said bolt is withdrawn to its utmost point in the backward direction and
retains it there, thus preventing the bolt from being driven forward into the staple
by the spring until the cam is withdrawn from the recess by the pressure of the key
against the said cam or detent.
Our third improvement relates to an improved form of the front plates of locks
through which the bolts of the same pass and is specially intended for such locks as
are used for the doors of Lunatic Asylums and similar places where it is important
to keep the lock from being tampered with. We make the said front-plate of the
lock with a projecting piece which projects at right angles from it and which in
conjunction with a rebated striking plate effectually prevents the bolt of the lock from
being pushed back by means of a knife or other instrument.
DESCRIPTION OF THE DRAWINGS.

page_text: Fig. 7. represents the action of our improved detent, D being the detent and E the
notch or recess in which it fits to retain the bolt in its backward position. Upon H
the belly or projection of detent D being pressed by the key I it moves in the direction
shown by the arrow and thus allows the bolt to be shot forward by the spring F.
The spring G actuates the detent so that it slips into the notch again when the bolt
is withdrawn to its full extent.
This
Fig. 8 shews at a the projecting piece from the front plate of the lock.
projecting piece is also shown at a. a Fig. 7. bb Fig. 8. show in section the rebated
striking-plate, which in conjunction with the projecting piece a. a. prevents the bolt c
from being tampered with from the outside.
Having now particularly ascertained and described the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is;
"
(1) The operation of a bolt by a cam to withdraw the same or propel it in the
manner described.
(2) The two configurations or shapes of the said cam as shown at A in Figs. 1. 2.
3 & 4.
(3) The indication of the position of the bolt by means of the cross handle C,
Figs. 5 & 6.
(4) The shape configuration and action of the detent D, Fig. 7.
(5) The actuating of the same by the ordinary key of the lock, so that it cannot be
moved from the outside.
(6) The shape and configuration of the striking plate in conjunction with the
projecting piece a Fig. 8.
Dated this 3rd day of December 1888.
For FRANK SMITH