Improvements in Catches for Railway Carriage and other Doors or Gates.
Year: 1895

page_text: Date of Application, 26th June, 1895
Complete Specification Left, 26th Mar., 1896-Accepted, 2nd May, 1896
PROVISIONAL SPECIFICATION.
Improvements in Catches for Railway Carriage and other Doors
or Gates.
I, JOHN JULIUS ADLER, Carriage and Wagon Superintendent, Rajputana-
Malwa Railway, Ajmere, East India, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in safety catches for railway carriage
and other doors or gates and has for object the construction of a catch which will
automatically secure the door upon being slammed to, irrespective of the usual
lock and which can readily be understood and operated by the guard or other
official.
In applying my invention to the construction of a safety catch for a railway.
carriage door, I pivot an L-shaped lever which may be of metal or other suitable
material within a metal frame or staple secured to the door and so balance it, that
upon the door being slammed to the lower or shorter arm of the lever will
automatically engage with a staple of special construction secured to the door post.
This staple consists of a plate of metal or other suitable material, and has two
curved projecting pieces or lugs on its face arranged one above the other, and so
constructed that upon the short arm of the lever striking either the one or the
other, the door is automatically secured by the arm of the lever entering the space
formed by the curved shape of the lower projecting piece. The catch plate or
lever is of approximately an L shape and has a lug formed at the top extremity of
the vertical arm to serve as a handle or thumb piece, so that when it is desired to
release the door the operator has only to pull this handle or thumb piece back to
raise the horizontal catch piece or projecting arm of the lever and thus release it
from the lower curved piece on the staple.
The upper projecting piece on the staple does not form a catch but is designed
for the purpose of ensuring the fastening of the door by driving the catch plate or
lever arm downwards in case the catch plate should not be in position to strike the
lower projecting piece. In lieu of the above I may construct the staple so that
the upper projecting piece forms the catch, and design the lower projecting piece
to force the catch plate upwards when not in its correct. position. In this case the
catch plate in so shaped and balanced that the catch piece tends to remain in its
highest position. The staple carrying the lever is furnished with a stop to regulate
the extent of movement of the lever.
Doted this Twenty-sixth day of June 1895.

page_text: Improvements in Catches for Railway Carriage and other Doors.
or Gates.
I, JOHN JULIUS ADLER, Carriage and Wagon Superintendent, Rajputana-
Malwa Railway, Ajmere, East India, 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 improvements in safety catches for railway carriage
and other doors or gates and has for object the construction of a catch which will
automatically secure the door upon being slammed to, irrespective of the usual
lock and which can readily be understood and operated by the guard or other
official.
In order that my invention may be more clearly understood reference is had to
the accompanying drawings upon which-
Figure 1, is a front elevation of my improved safety catch.
Figure 2 being an end elevation of same.
In applying my invention to the construction of a safety catch for a railway
carriage door I pivot an approximately L-shaped lever A which may be of metal or
other suitable material, at a centre b, within a metal frame or staple B, secured to
the door, and so balance the lever that upon the door being slammed to, its lower or
shorter. arm a will be automatically caused to engage with a staple C of special
construction, secured to the door-post and more particularly described hereafter.
The staple C.consists of a plate of metal or other suitable material, and has
formed upon or attached to its face, two curved projecting pieces or lugs c, c¹,
arranged one above the other, as shewn, and so constructed that upon the short
arm a of the lever A striking either one or the other of the lugs, the door will be
immediately secured automatically by the arm a entering the recess or space formed
by the curved shape of the lower projecting piece or lug cl.
.
At the upper extremity of the vertical arm a', the catch plate or L-shaped lever
is provided with a lug d to serve as a handle or thumb-piece, by means of which
when it is desired to unfasten the door, the operator may pull. back the vertical
arm a' thus raising the shorter arm or catch-piece a of the lever A and disengaging
it from the lower curved piece or lug c¹ on the staple C.
In the foregoing arrangement it will be seen that the upper projecting piece or
lug c on the staple C does not fulfil the purpose of a catch, but is arranged in a
manner to ensure the fastening of the door by driving the short arm a of the lever A.
downwards in case the catch plate should not be in position. to strike the lower
projecting piece or lug c¹.
+
In lieu of the above described arrangement, I may construct the staple C so
that the upper projection or lug c forms the catch, and may form the lower. lug c
so that it will force the lever arm a upwards when the catch-plate is not in its
correct position for engagement. In this case the pivoted lever: A is.80 shaped and
balanced, that the short arm or catch-piece a tends normally to remain in its highest
position.
The staple B carrying the lever A is furnished with a suitably arranged stop, to
limit the extent of movement of the said lever.
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. A safety catch for railway carriage doors and the like, comprising a balanced
lever A pivoted within a staple B secured on the door, and arranged to engage

page_text: automatically with a lug e or c' formed on or attached to a staple C fixed upon the
door-post, operating for the purpose and as described with reference to the
accompanying drawing.
Dated this 26th day of March 1896.
-
For the Applicant,
GEDGE & FEENY,
60 Queen Victoria Street, London, E.C., Chartered Patent Agents.