Improvements in Door Locks and Latches.
Year: 1891

page_text: Date of Application, 4th July, 1891
Complete Specification Left, 2nd Apr., 1892-Accepted, 7th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in Door Locks and Latches.
I, ALFRED FOSTER, of 19, Walsall Road, Willenhall, Staffordshire, Latch
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to those door locks and latches in which the lock
or latch case is constructed to fix against the side of the door. In these locks and
latches as usually constructed a long key is necessary because the key has to pass
through the door into the lock or latch case.
This invention consists in the hereindescribed improved construction and arrange-
ment of the lock or latch case and operating mechanism whereby I am enabled to use
a short key which is much more convenient for carrying in the pocket.
In carrying out my invention I arrange the lever or tumbler mechanism in a
small box (preferably of rectangular form) which is fixed by screws or otherwise
to the outside of the usual cover plate of the lock or latch which is next to the
door when the lock or latch is fixed thereto, this small projecting box being
recessed into the door. The said box also contains or may contain, a small bolt or
slide which is moved to and fro by the key, or which is moved back by the key
and shot forward by a spring, and which operates in combination with the said
lever or tumbler mechanism in the usual way. The usual bolt of the lock or latch
has a side projection which passes into the said box and is engaged by the said
small bolt or slide therein, or is engaged by the key, the said small bolt or slide in
this latter case being dispensed with.
The key has only to be made long enough to pass through part of the door and
into the said small box. The pin of the key turns in a small hole in the said cover
plate and the key is or may be, also steadied by a tubular nose which is fixed to
the front of the said box and passes, if desired, to the other side of the door.
Dated this 3rd day of July 1891
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Door Locks and Latches.
I, ALFRED FOSTER, of 19, Walsall Road, Willenhall, Staffordshire, Latch
Manufacturer, 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 those door locks and latches in which the lock or
latch case is constructed to fix against the side of the door. In these locks and
latches as usually constructed a long key is necessary because the key has to pass
through the door into the lock or latch case.
This invention consists in the herein described improved construction and
arrangement of the lock or latch case and operating mechanism whereby I am
enabled to use a short key which is much more convenient for carrying in the
pocket.
In carrying out this invention I arrange the lover or tumbler mechanism in a
small box (preferably of rectangular form) which is fixed by screws or otherwise
to the outside of the usual cover plate of the lock or latch which is next to the
door when the lock or latch fixed thereto, this small projecting box being
7

page_text: recessed into the door. The said box also contains or may contain, a small bolt or
slide which is moved to and fro by the key, or which is moved back by the key and
shot forward by a spring, and which operates in combination with the said lever or
tumbler mechanism in the usual way. The usual bolt of the lock or latch has a
side projection which passes into the said box and is engaged by the said small
bolt or slide therein.
The key has only to be made long enough to pass through part of the door and
into the said small box. The pin of the key turns in a small hole in the said cover
plate and the key is or may be, also steadied by a tubular nose which is fixed to
the front of the said box and passes, if desired, to the other side of the door.
On the accompanying drawing Figs. 1, 2, 3, 4, 5 and 5* illustrate my invention
as applied to a lever night latch which is not made to be locked. Of these
Fig. 1 is an elevation and Fig. 2 is a sectional plan of the said night latch Fig. 2
also shewing part of the door to which the said night latch is fixed;
Fig. 3 is an elevation of the said night latch with the small box part removed;
Fig. 4 is an elevation and a plan of the bolt of the latch separately;
Fig. 5 is an elevation and plan of the small bolt or slide which operates on the
larger bolt shewn by Fig. 4; and
Fig. 5 shews the key of the said night latch;
Fig. 6 shews my invention applied to a night latch which is made to lock; the
small box part having been removed so as to shew the mechanisin more clearly.
Fig. 7 is an elevation and a plan of the main bolt or latch shewn by Fig. 6 and
Fig. 8 shews the bolt or slide of the same.
The same letters of reference indicate the same or corresponding parts in all the
figures of the drawings.
Referring firstly more particularly to Fig. 1 to 5* both inclusive A is the latch
casing and B is the cover plate of the same. C' is the usual latch bolt contained
in the casing A but for the purposes of this invention made with the side pro-
jection e which passes through the slot in the cover plate so as to be engaged by
the small bolt or slide D which latter is slotted at d¹d to take on to the pins 2
and be moved back by the key G. E is the small projecting box fixed on the
outside of the cover plate B by the screws 62 or by other means and containing
the lever or tumbler mechanism. This small box E is recessed into the face of the
door as shewn in Fig. 2. In the particular latch shewn by Figs. 1, 2, 3, 4, 5 and 5*
lever mechanism is used consisting of the two levers FF turning on the pin 2
fixed to the cover plate B and arranged to be lifted by turning the key G and
adapted to engage with the pip d³ on the small bolt or slide D when the bolt or
latch C is shot forward as shewn in Fig. 3. I is the usual spring for forcing the
bolt or lock C forward.
When the main bolt or latch C is required to be locked so that it cannot be
drawn back by the knob without first turning the key I provide another projec-
tion thereon which projects through a slot 2 in the plate B so as to be engaged
by the shoulder d' on the slide or bolt D (see Fig. 8) when the slide or bolt D is
shot forward into its locked position. The levers F1 F2 in this example have to
have an extra notch as shewn in Fig. 6 to engage with the projection when
the slide or bolt D is shot forward into its locked position.
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. In a door lock or latch and in combination with the draw back bolt C thereof
the employment of bolt operating mechanism substantially as herein before described
and illustrated by the accompanying drawings arranged in a small box or case
fixed to the outside of the cover plate of the lock or latch so as to enable a short
key to be used as herein before set forth.
2. The combination and arrangement of parts constituting the improved night

page_text: latch herein before described and illustrated by Figs. 1, 2, 3, 4, 5 and 5* of the
accompanying drawings, whether one two or more levers such as F1 F are used.
3. The combination and arrangement of parts constituting the improved night
latch hereinbefore described and illustrated by Figs. 6, 7 and 8 of the accompanying
5 drawings whether one two or more levers such as F F are used.
Dated this 1st day of March 1892
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.