Improvements in Door Latches.
Year: 1889

page_text: Date of Application, 27th Sept., 1889
Complete Specification Left, 27th June, 1890-Accepted, 2nd Aug., 1890 ·
PROVISIONAL SPECIFICATION.
Improvements in Door Latches.
1, JOHN THOMAS BOWER, of London Road, Sittingbourne, in the County of Kent,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to door latches and has for its object to provide improved means
for locking such latches.
According to my invention I pivot to the latch a catch or turn-buckle which is
adapted to engage with a groove or notch formed in the guide in which the latch
slides as it is oscillated upon its pivot This guide is advantageously formed with a
notch or groove on each side so that it may be used with either a right or left-
handed latch.
It will be readily understood that, when the turn-buckle on the latch is in engage-
ment with one of the notches on the guide, it is impossible to lift the said latch.
Dated the 27th day of September 1889.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Door Latches.
I, JOHN THOMAS BOWER, of London Road, Sittingbourne, in the County of Kent,
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 :-
My invention relates to door-latches, and has for its object to provide improved
means for locking such latches.
According to my invention I pivot to the latch a catch or turn-buckle which is
adapted to engage with a groove or notch formed in the guide in which the latch slides
as it is oscillated upon its pivot. This guide is advantageously formed with a notch
or groove on each side.
It will be readily understood that, when the turn-buckle on the latch is in
engagement with one of the notches on the guide, it is impossible to lift the said
latch.
To enable my invention to be fully understood I will describe the same with reference
to the accompanying drawing, in which-
Figure 1 represents an elevation of part of a door having a latch provided with my
improvements and
Figure 2 a sectional plan of the same.
a indicates the latch proper, and the catch with which the same engages, which
parts are of ordinary construction.
c is the guide for the latch, which guide is provided with notches d, d; and e is the
turn-buckle which, according to my invention, is applied to the latch
and adapted
to engage with one of the notches in the guide c.
is the ordinary lever for operating the latch, and g the handle in connection there-
with. The latch may, however, be operated by any other suitable means, for instance,
by a rod passing through the latch at the pivot.
It will he obvious that, when the turn-buckle is in the position indicated in full lines
in figure 1, that is to say, when the free end thereof is in engagement with the adjacent
notch d in the guide c, the latch cannot be lifted by means of the lever f. When,
however, the turn-buckle is moved to the position indicated by dotted lines in

page_text: figure 1, against the stop hit will be obvious that the latch can he operated in the
ordinary manner.
By forming the guide c with two notches d, d one on each side thereof, as shewn, it
it is evident that the said guide may be used with either a right or left handed
latch.
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-
1. A door-latch provided with a turn-buckle adapted to be moved so as to
engage with a suitable notch to prevent the latch from being lifted, substantially as
described.
2. The manufacture and use of the improved door-latch herein before described and
illustrated in the accompanying drawing.
Dated the 27th day of June 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.