Latch-lock.
Year: 1892

page_text: Date of Application, 26th Nov., 1892
Complete Specification Left, 19th Apr., 1893-Accepted, 20th May, 1893
Latch-lock.
ALFRED GEORGE TALBOT 9 Lynwood Villas Whittington Road Bowes Park
Middlesex Mercantile Clerk do hereby declare the nature of this invention to be as
follows:-
In the form of ordinary desk lock with sunk latch, with the following differences :-
On face of lock a circular disk sunk with tixed crossbar, under surface grooved but
not completely round; fixed in back of lock a pin round which the groove travels ;
teeth on disk in turning the bar from right to left will act on lower tooth of
ordinary spring latch, throwing the latter back for opening lid, the pitch & shape of
teeth will be such that a movement from left to right only double locks the latch.
To set the lock back the ordinary key movement on latch will allow disk to be
returned to first position. The number of times the lock may be used without
requiring passkey will vary with the size of lock & the wishes of holder of
pass-key. With one action the latch is locked for good.
Dated this 26th day of November 1892.
ALFRED GEO. TALBOT.
COMPLETE STEOITATION.
Latch-lock,
I, ALFRED GEORGE TALBOT 9 Lynwood Villas Whittington Road Bowes
Park Middlesex Book-keeper 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:-
In the form of ordinary desk lock with sunk latch with the following differences.
On the face of lock a circular disk sunk with fixed crossbar, under surface grooved
but not completely round; fixed in back of lock a pin round which the groove
travels; teeth on disk in turning the bar from right to left will act on lower
tooth of ordinary spring latch, throwing the latter back for opening lid, the pitch
and shape of teeth will be such that a movement from left to right only double locks
the latch. To set the lock back the ordinary key movement on latch will allow
disk to be returned to first position. The number of times the lock may be used
without requiring pass key will vary with the size of lock and the wishes of holder
of pass key. With one action the lock is locked for good.
Referring to the annexed drawings
Figure 1 is a front elevation of my improved lock.
Figure 2. side elevation of same.
Figure 3. front elevation with one side of casing or cover plate removed.
Figure 4. view of toothed wheel removed.
Referring to Figure 3, a is the latch pivoted at b and controlled by the spring c,
d is a projection on the latch a which comes into contact with the teeth e on the
wheel. 9 is a ward which operates the latch when desired through the medium
of a key shown by dotted lines h. i is a slot cut in the wheel f. j is a pin or stud
attached to the said wheel f. k is an aperture engaging with a pin t secured to the
casing and upon which the wheel rotates. m is a handle or projection for
revolving or rotating the wheel f. n is a pin attached to the casing 7. This pin n
enters the slot in the wheelf. The cover plate o (Figure 2) has an inwardly
projecting circular rim p, shown by dotted lines, which keeps the wheel ƒ' in place
[D077

page_text: owing to the edge of the rim retaining the wheel fon the pivot pin t. r is the
plate to which the hasp s (dotted lines Figure 3) is attached.
g
The working is as follows:-The latch a is lifted by means of the ward &
key h, the wheel is then rotated in the direction of the arrow 1 until the stud g
comes into contact with the pin n, the latch a is now allowed to fall and the key
withdrawn. When it is desired to open the latch the wheel is rotated in the
direction of the arrow 2, and the latch raised by the teeth e engaging with the
projection d. In the example shown the latch may be raised or opened six times
when the stop j will come into contact with the pin n, the key being then used to
open the latch and re-set the wheel f.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The combined construction and arrangement of the various parts substantially
as described.
2. In latch locks a toothed wheel rotating on a pivot and having a circular
.groove or slot in which a pin attached to the casing enters; a stud secured to the
wheel in the said groove; a cover plate having an inwardly projecting circular
rim; a latch having a projection for engaging with the teeth on the said wheel, in
combination with a key and ward, substantially as described.
Dated this 19th April 1893.
E. EATON,
Agent for Applicant.