IMPROVEMENTS IN THE MEANS OF LATCHING AND UNLATCHING DOORS
Year: 1884

page_text: PROVISIONAL SPECIFICATION..
I, JOSEPH KAYE of Kirkstall in the County of York and 93 High Holborn
London in the County of Middlesex, Lock maker do hereby declare the nature of
my invention for IMPROVEMENTS IN THE MEANS OF LATCHING AND UNLATCHING
DOORS to be as follows:-
This invention relates to certain improvements in the means of latching and
unlatching doors whereby the act of closing the door secures the same when the.
further locking is accomplished by means of a centre tongue in ordinary usą on
railway carriage doors.
The catch I use is described in the specifications of Letters Patent granted to
myself and others on the 22nd day of December 1877 N° 4873-also in Letters
Patent granted to me on the 21st day of April 1880, N° 1643, and on the 14th day
of February 1883 N° 814, and consists of a protuding latch of quadrant form
working on a centre and retained in position beyond the face of the lock by a
spiral spring in the lock.
The combination of this latch or catch with the ordinary railway lock gives a
secure fastening to doors when shut to without violence. When it is desired to
open the door, by the turning of the handle, actuating the centre tongue the catch
or latch above is drawn back by the same movement.
WAUGH & CHAPMAN,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
I, JOSEPH KAYE, of Kirkstall, in the County of York, and 93 High Holborn,
in the County of Middlesex, Lock Maker, do hereby declare the nature of my
invention for IMPROVEMENTS IN THE MEANS OF LATCHING AND UNLATCHING
DOORS, 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 certain improvements in the means of latching and
unlatching doors whereby the act of closing the door secures the same, when
further locking is accomplished by means of a centre tongue in ordinary use on
railway carriage doors...
The catch I use is described in the specification of Letters Patent granted to
myself and others on the 22nd day of December 1877: N° 4873: also in Letters
Patent granted to me on the 21st day of April 1880, N° 1643: and on the 14th day
of February, 1883 N° 814: and consists of a protruding latch of quadrant form
working on a centre, and retained in position beyond the face of the lock by a
spiral spring in the lock.
The combination of this latch or catch with the ordinary railway lock, gives a
secure fastening to the doors when shut to without violence. When it is desired
to open the door, by the turning of the handle actuating the centre tongue, the
latch or catch above is drawn back by the same movement.
"
Having now stated the nature of my invention, I will proceed to describe the
same more in detail by aid of the accompanying drawings, in which Fig 1
represents a view of the interior of my improved latch with the ordinary centre
tongue turned clear of the face of the latch, or if the door was closed clear of the
striking plate. Fig 2 is a similar view with the centre tongue turned to protrude
beyond the face of the lock. Fig 3 is a view shewing the centre tongue turned
back to withdraw the quadrant catch. Fig 4 is a section through the upper portion
of the latch at line. a. b., and Fig 5 is a view of the face of the latch as shewn
by Fig 1.
The shell or latch frame is indicated by the letter A, to which is fitted the
protruding quadrant catch B mounted upon a pin as centre, and is retained in the
position shewn by Figs 1. 2 and 4, by the spring S, which is compressed between
the flange A¹ and a shoulder on the centre spindle C, the end of the latter pressing
against the raised portion of bar D, the end of which fits into a recess formed in
the quadrant catch B.
When the railway carriage door is closed, the quadrant catch B will engage in
the top recess E formed in the striking plate see Fig 6, which represents a front
view, and by which the door is fastened; which is further secured by the turning
of the centre tongue F to the position shewn by Fig 2, the tongue entering the
long slotted recess G.
Since obtaining provisional protection, I have discovered the difficulty of working
the tongue in conjunction with the striking plate, as it is difficult to fix the one in
true relationship to the other. In order to compensate for irregularity in the
fixing of the latch and striking plate as before described, I form the latter with a
plate H mounted upon two bars as shewn by the back view Fig 7; and place

page_text: a spiral spring upon each bar which will allow the plate H to yield when the tongue
enters the slotted recess, and thus prevent the door shaking in the case of wear and
tear. A section of the striking plate is shewn by Fig 8.
When it is desired to open the door, the handle actuating the centre tongue Fis
turned until the tongue comes in contact with the projection D¹ on bar D, which
is somewhat similar to that described in my specification N° 814 dated 14th Feb
1883, thereby causing the said bar to move in the direction of the arrow, by which
the quadrant catch B is actuated and withdrawn from the recess E in striking
plate. As soon as the handle of centre tongue F is released, the springs K acting
on the arm L, cause the centre tongue F to return to the position shewn by Fig 1,
thus releasing the bar D and quadrant catch B, which are forced back to their
normal position by spring S, ready for fastening the door when it is closed.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
A latch in which is mounted a quadrant catch that automatically engages with
the striking plate when the door is closed, and which is released from the striking
plate by the turning of the handle in connection with the centre tongue F
substantially as herein described.
-
The lever L in combination with the spring or springs K for the purpose of
keeping the tongue F in position; and the compensating plate H in the striking
plate only in combination with the lock herein described.