Improvements in Locks and Latches.
Year: 1893

page_text: te of Application, 17th Jan., 1893-Accepted, 11th Mar., 1893
COMPLETE SPECIFICATION.
Improvements in Locks and Latches.
We, JOHN GREEN, of 15 Cleveland Street, Engineer, and JOHN CORNFORTH,
of Victoria Works, Bell Street, Manufacturer, both of Wolverhampton, in the
County of Stafford, 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 relates to the manner in which we construct and arrange locks
and latches and combination locks and latches, whereby we are enabled in a con-
venient and simple manner to keep the latch out of locking position, for the purpose
enabling the door to be opened from without.
In carrying our invention into effect we make the furniture of the lock in such a
manner that a sliding bolt, a swivelling lever, a plain hook lever, or an. ordinary
pin may be employed to retain the catch or latch within the lock frame or case, by
the manner in which such catch pin or lever engages with or enters into the rose
upon the handle spindle or upon a plate or disc attached thereto, instead of
requiring a slide as shown at L Figure 1A which is an end elevation of an ordinary
mortice lock.
We employ our improved system of latch or bolt retaining on locks and latches
of any ordinary or usual construction; and we apply the retaining levers or catches
for attachment to the door lock furniture with peculiar advantage when con-
structing locks in the manner set forth in the Specification of our Patent No. 4824
of 1891.
In the two accompanying sheets of explanatory drawings Figure 1 is a front
elevation of our lock constructed with our tell tale indicator as set forth in the
Specification of our Patent herein before referred to, and having our improved
lever catch A for holding back the bolt B, arranged to engage within a hole or
recess C' cut within a washer C or enlarged end of the handle D:
Figure 2 is a detail part sectional elevation showing a modification of the lever
and catch in which a projection C is provided upon the end of the handle or upon
a washer plate carried upon the handle spindle, the catch A being arranged so as
to fall behind the projection C instead of entering into the slot or groove cut within
the disc as shown at Figure 1 and Figure 6.
Figure 3 is an elevation showing an ordinary latch with the usual system or
sliding stud H now generally employed to retain such latches. Instead of employing
a sliding stud to engage with the bolt B we employ our lever A¹ to enter within a
slot Cs cut within the handle back plate C, or we cause the catch lever A³ to pass
behind this plate as shown in detail elevation at Figure 4.
Figure 5 is a front elevation of an ordinary combination lock and latch showing
the usual method of retaining the latch by means of the chain, pin G which enters
the hole G. This chain and pin system we replace by means of our catch lever A³
which enters the slot C or engages with a projection such as C³, for retaining the
latch by securing the handle or knob from movement.
Figure 6 is a front elevation showing the chain and pin E employed to retain the
handle in accordance with our present invention, by entering a hole or passing
behind a projection on the handle, or upon a washer or disc carried upon the handle
spindle.
On Sheet 2 Figure 7 is a front elevation of the furniture we prefer to employ
for our tell tale locks constructed in accordance with our Patent No. 4824 of 1891
a carried on the
hereinbefore referred to, the lever A' being mounted upon a pin
furniture, washer or plate K and caused to engage either with a projection on the

page_text: spindle, or to enter into a recess or groove cut within the handle or cut within a disc
carried upon the spindle as shown.
We do not limit the application of our invention to any particular form or arrange-
ment of lock and latch, but we employ the same essential features of retaining the
handle or the furniture.fittings or the lock when it is desired to retain the bolt or
catch modified to suit any particular requirement.
We employ our improved handle or spindle retaining system for securing the
bolts of push and pull action locks or latches, by arranging our lever to pass
behind or between the handle and the furniture, so as to prevent its being pulled in
or out until such lever or slide has been withdrawn.
Having now particularly described and ascertained 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 construction of locks in which the bolt or latch is secured or retained by
means of a lever slide or pin entering into or engaging with the handle or a washer
or plate carried upon the handle spindle substantially as hereinbefore described.
2. The construction of locks and latches in which the handle spindle is prevented
from turning when it is desired to retain the bolt or latch substantially as herein
before described and as illustrated in the accompanying drawings.
3. The construction of fittings such as levers or locking pins for securing handles
or discs upon the handle spindles from rotating or sliding, substantially as herein-
before described and as illustrated in the accompanying drawings.
4. The combination and arrangement of a lock rose, disc or front plate such
as K having a sliding or swivelling catch lever such as A and pin mounted thereon,
substantially as and for the purposes herein described and as illustrated in the
accompanying drawings.
Dated this 13th day of January 1893.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicants.