Improvements in and Connected with Railway Door and other Locks.
Year: 1888

page_text: Date of Application, 29th Sept., 1888
Complete Specification Left, 27th June, 1889-Accepted, 28th Sept., 1889
PROVISIONAL SPECIFICATION.
Improvements in and Connected with Railway Door and other
Locks.
I, WILLIAM STRONACH LOCKHART of 7 Fenchurch Street in the City of London,
Engineer, do hereby declare the nature of this invention to be as follows:
--
In specifications No. 8087 of 1884, and No. 3912 of 1887 are described certain
constructions of door or "slam" locks which though applicable for many classes of
doors, are particularly well suited for use in railway and other carriages.
The present invention relates to locks of the class described in said specifications,
and consists of improvements in the arrangement and construction of the parts, the
nature of which may be understood from the following description.
The outer handle carries a block or catch which travels up an incline and over a
notch or recess as the said handle is turned to unfasten the door. The bandlo shaft
is provided with a collar into which a plate or catch piece fits which while permitting
the shaft to turn keeps the handle bearing on the face plate carrying the incline.
One end of the actuating spring is attached to a screw or fixed point at the back of
the face plate, and the other secured to a square or angled nut or internally squared
collar which in turn fits upon and is held by the shaft formed to receive it.
The inner end of said shaft engages with the inner handle, so that the two will
turn in unison, but the inner handle has also a longitudinal movement with relation
to the shaft, said movement being given by a screw thread on the inner face plate
with which the handle engages, the action being such that as the handle is turned to
fasten the door the lock projection is pressed more and more hardly upon the end of
the striking plate, bringing the door "home."
The entire action of the lock is as follows, it being assumed that the door is open
and the catch resting in the notch in the incline on the face plate-this being its
normal position when the door is open. As the door is closed the lock projection
travels up the inclined striking plate, carrying the catch up beyond the notch on the
"incline" (which at this point may be level if preferred) against the action of the
spring. So soon as the lock projection reaches the inner end of the striking. plate
the spring is free to act and turn the handle locking the door, the catch in passing
down the incline being prevented from falling into in the notch by reason of its
contact with the outer edge of the striking plate.
Dated this 29th day of September 1888.
PHILIP M. JUSTICE,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in and Connected with Railway Door and other
Looks.
I,. WILLIAM STRONACH LOCKHART of 7 Fenchurch Street in the City of London,
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 :—
In specifications No. 8087 of 1884, and No. 3912 of 1887 are described certain
constructions of door or "slam" locks which though applicable for many classes of
doors, are particularly well suited for use in railway and other carriages.

page_text: The present invention relates to locks of the class described in said specifications,
and consists of improvements in the arrangement and construction of the parts, the
nature of which may be understood from the following description, reference being
made to the accompanying drawings which form part of this specification and in
which
Fig. 1 is a sectional view with the catch shown in its raised position just as the
door is being closed or opened.
Fig. 2 is an elevation showing the catch in end view, the parts being in the position
they occupy when the door is open.
Fig. 3 is a plan view on the line a x, and
Fig. 4 is a plan view showing the catch resting against the stop.
The outer handle A carries a block or catch a which travels up an incline b and
over a notch or recess c as the said handle is turned to unfasten the door. The
handle shaft is provided with a groove d into which a plate or catch piece e (secured
by screws and 1) fits, which, while permitting the shaft to turn keeps the handle
bearing on the face plate B carrying the incline b. One end of the actuating helical
spring D is attached to the screw or a fixed point f at the back of the face plate, and
the other is secured to a square or angled nut or internally squared collar 9₁ which in
turn fits upon and is held by the shaft formed to receive it.
The inner end of said shaft engages with the inner handle E, so that the two will
turn in unison, but the inner handle has also a longitudinal movement with relation
to the shaft, said movement being given by a screw thread on the inner face plate F
with which the handle E engages, the action being such that as the handle is turned
to fasten the door the lock projection is pressed more and more hardly upon the end of
the striking plate j, bringing the door "home."
"
The entire action of the lock is as follows, it being assumed that the door is open
and the catch a resting in the notch e in the incline b on the face plate B, this being
its normal position when the door is open. As the door is closed the lock projection i
travels up the inclined striking plate, carrying the catch a up beyond the notch con
the "
"incline
b (which at this point may be level if preferred) against the action
of the spring D. So soon as the fock projection i reaches the inner end of the striking
plate the spring D is free to act and turn the handle, locking the door, the catch a
carried by spring k in passing, down the incline 6 being prevented from falling
into the notch c by reason of its contact with the outer edge of the striking
plate j.
The requisite tension on spring D may be secured in several ways, a convenient
method being to attach it to the point and nut g, and then to pass the shaft through
the nut so as to engage therewith without bringing the handle A and catch a so close
to the face plate B as to engage therewith:
Said face plate being held, the handle may be turned until the desired tension is
secured, when the parts are pushed home, and catch piece e pivoted on f is brought
into engagement with groove d and secured by screw [.
Another method is to turn nut g while free from the shaft, and when the desired
tension is secured, to slip it on and force it home.
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 railway door and other locks the shaft, the face plate carrying the incline
with a notch therein, the inner handle provided with a lug or projection adapted to
travel up the striking plate and cause the catch to leave the notch, all in combination
with a helical actuating spring, substantially as set forth.
2. In combination with the parts set out in the preceding claim an inner screwed
boss adapted to engage with the inner handle, substantially as and for the purposes set
forth

page_text: 3. The general arrangement and construction of parts forming the improved lock
for railway or other doors, substantially as described, and as illustrated in the
accompanying drawings.
Dated this 27th day of June 1880
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Applicant's Agent.