Improved Lock for Securely Fastening of Doors.
Year: 1897

page_text: Improved Lock for Securely Fastening of Doors.
GEORGE BRYANT, 17, Athelstane Road, Finsbury Park, London, N., Electrical
Engineer, do hereby declare the nature of this invention to be as follows:-
A case or box made of metal in which to hold the parts to form the lock, the
large bolt in the case as a aperture at the end, which rides over a catch or fastener,
the large bolt shoot outwards in comeing into contact with the fastener on the frame
of the door, and rides over the fastener and slides back to its position, and in so
doing it securely fastens the door, also there is a small bolt that can slide into the
large bolt which
as the aperture in, and in so doing, the small bolt throwes over
a shutter that closes the key hole up and prevent any person tampering with it
from the out side.
I, GEORGE BRYANT, of 17, Athelstane Road, Finsbury Park, N., Electrical
Engineer, 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:-
-
This invention has reference to an improved lock for securely fastening doors
and our invention consists in the improvements substantially as heroinafler
described.
In order that our invention may be readily understood reference is made to the
accompanying drawings wherein like letters of reference indicate corresponding
parts throughout the several figures and in which
Fig. 1 shows one side of the bolt the lock case being shown in dot and dash
lines.
Fig. 2 shows the reverse side of our improved lock.
Figs. 3 and 3 show side elevation and plan view respectively of a detail here-
inafter referred to.
In carrying this invention into practice we employ a lock case A of any suitable
construction and within said case we provide a bolt B which is adapted to slide
within said case in the ordinary manner. Suid bolt is provided with a handle C
which projects through the case and by means of which the bolt B may be slid
back in the usual way. The end of the bolt which normally projects through the

page_text: side of the lock case, is formed with an aperture b so that if the part 6' of the bolt B
be brought in contact with inclined surface of the catch or equivalent D-which is
fixed to the door post-as will be the case when the door is being closed, the said
part b' will ride over the shoulder d of the catch D and a suitable spring will cause
the part 6 to engage with the catch D. For the purpose of disengaging the bolt
from the catch D it is necessary-by means of the handle C or of a key-the slide
the bolt outwards and then to open the door. A great advantage appertaining to
our improved lock or latch is that the bolt cannot be forced back as can be done with
the bolt of an ordinary lock or latch and that it is practically impossible to dis-
engage the bolt from the catch except by means of the handle or by means of the
proper key.
In order to prevent the lock being tampered with by means of a key, we provide
our improved lock with a sliding catch or equivalent E which is adapted to engage
in a slot or groove in the bolt B and in order to also close the key-hole we pivotally
support a plate or the like e shown in dotted lines in Fig. 2, which plate is so
connected with the sliding catch E that when the said catch has been put in
engagement with the bolt B, the plate or the like e will have been swung so as to
cover the key hole and thus prevent the insertion of a key into the lock, and in
order to prevent the plate e being pushed back from the key hole and thereby the
sliding catch E raised out of engagement with the bolt B, I provide said sliding
catch E with a pin which is adapted to engage in an aperture in the lock case, the
arrangement being such that the said pin is held in the aperture referred to by
means of a suitable spring and said pin can only be disengaged from the aperture
in the case by lifting the sliding catch E upward in the usual manner.
We wish it to be understood that we do not confine ourselves to any particular
shape of the bolt B nor to any particular manner in which the bolt may be caused
to slide in either direction.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to he performed we declare that what
we claim is:-
1. An improved lock having a bolt such as B adapted to engage with a catch such
as D in the manner hereinbefore set forth.
2. An improved lock having a bolt such as B formed with an aperture 6 the
part being adapted to slide over the shoulder d of a catch D all for the purposes
and substantially as set forth.
3. An improved lock having a bolt such as B formed with an aporture b and
having a sliding catch such as E said catch E moving a plate or equivalent e all
for the purposes and substantially as set forth.
4. An improved lock having a sliding catch such as E formed or provided with
pin adapted to engage with an aperture in the lock case for the purpose and
substantially as set forth.
B
Dat this 5th dose of April 1898