Improvements in Carriage Door Latches.
Year: 1890

page_text: Date of Application, 3rd Dec., 1890
Complete Specification Left, 1st Sept., 1891-Accepted, 3rd Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in Carriage Door Latches.
I HENRY TOMLINSON of Holme Road Market Weighton in the County of
York Railway Guard do hereby declare the nature of this invention to be as
follows:-
The main objects are to provide a cheap simple and efficient latch for
automatically securing carriage doors when closed.
The invention consists essentially of the combination of an oscillating latch with
a trigger acting at right angles to the plane of motion of the latch, and also in
the combination with the latch of an actuating spring passed through a slot and
held in position by screws or equivalent devices.
Dated the 2nd December 1890..
COMPLETE SPECIFICATION.
Improvements in Carriage Door Latches.
I HENRY TOMLINSON of Holme Road Market Weighton in the County of
York, Railway Guard, 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:-
The main objects are to provide a cheap simple, and efficient latch for
automatically securing carriage doors when closed.
The invention consists essentially of the combination of an oscillating latch with
a trigger acting at right angles to the plane of motion of the latch and also in the
combination with the latch of an actuating spring passed through a slot and held in
position by screws or equivalent devices.
DECRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal section and Figure 2 a transverse section of a latch
constructed in accordance with my invention, a is the lock frame and face plate,
b. are the cover plates, c is the striking plate, d is the oscillating latch pivoted to
the cover plates at e and having a square hole through the pivot for the usual
handle. is a spring for actuating the latch. The said spring is passed in position
through the slot or opening g in the back of the lock and is held is position by
screws or pins h passing through the cover plates-i is a trigger notch in the latch d,
j is a trigger pivoted in a boss k secured to the frame a so as to be free to oscillate
at right angles to the plane of motion of the latch d. 1 is a lever pivoted to the
cover plates b at m and resting with its free end on the trigger j. n is a spring
secured to the frame a at o and pressing on the lever l at p. The said spring might
act directly on the trigger j, and the lever / be dispensed with. The face of the
latch d projects slightly in front of the face plate a', when retained out of action
by the trigger j.
When the door is closed having the latch in the position shown by the full lines
in Figure 1, the butt j' of the trigger strikes against a lip c¹ on the striking plate,
the trigger is thereby caused to oscillate on its centre and is lifted out of the
notch in the latch d, the latch d is then turned on its centre by the spring fand
moves into the position shown by the dotted lines so that the door is held securely
LD
1

page_text: closed. To open the door the handle is turned until the trigger ; enters the notch
when the door can be opened.
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
claim is :-
First. In carriage door latches the combination of an oscillating latch with a
'trigger at right angles thereto substantially as and for the purpose set forth.
Second. In carriage door latches the combination of an oscillating latch and
spring substantially as set forth.
Third. The improved carriage door latch herein set forth.
Dated this Thirty-first day of August 1891.
Per pro J. T. KING,
J. Johnson,
Agent.