IMPROVEMENTS IN LOCKS AND FASTENINGS FOR RAILWAY AND OTHER CARRIAGE DOORS & FOR OTHER PURPOSES
Year: 1884

page_text: I JAMES MATTHEW MATTHEWS of the Crown Iron Works 63a Carpenters Road
Stratford in the County of Essex Engineer do hereby declare the nature of my
invention for IMPROVEMENTS IN LOCKS AND FASTENINGS FOR RAILWAY AND OTHER
CARRIAGE DOORS & FOR OTHER PURPOSES to be as follows:-
In constructing locks on my improved plan I dispense with the usual pawl or
trigger which forms a stop and which is usually actuated by a separate spring, and
in its place provide a fixed stop in the lock case thus considerably reducing the
cost, the lock case is of the usual form employed for the purpose having a plain slot
in the face to allow the bolt or tumbler to pass freely in and out I construct the
tumbler separate from the eye, with an oblong slot or opening which allows it to
work upon a shoulder formed upon the eye for the purpose upon the outer face of
the tumbler I form a lip or projecting piece which I usually allow to project from
the lock case, on the lower edge of the tumbler a radial tooth is cut which engages
with the fixed stop in the lock case provided for that purpose, upon the striking
plate a projecting inclined surface is formed, the action of the lock is as follows
upon closing the door the projecting lip on the tumbler comes in contact with the
corresponding projection on the striking plate provided for the purpose this causes
the tumbler to rise and releases the tooth from the stop the tumbler is then forced
round or forward by means of a spring or other suitable means into the staple or
receptacle provided for it on the door post, in opening the door the handle is
turned in the ordinary way until it is vertical when the tumbler drops or is forced
down as the case may be and the radial tooth engages with the stop provided for
that purpose, the door can then be pushed open altho the handle is released the
peculiar construction of the projection on the striking plate which is rounded and
bevilled both ways forming two inclined surfaces allowing the door to open without
again disengaging the tumbler. Instead of the inclined surface projecting from
the face of the striking plate I sometimes form it as an indent.
DAL
T
1004

page_text: I JAMES MATTHEW MATTHEWS of the Crown Iron Works 63ª Carpenters Road
Stratford, in the County of Essex, Engineer do hereby declare the nature of my
invention for IMPROVEMENTS IN LOCKS & FASTENINGS FOR RAILWAY & OTHER
CARRIAGE DOORS & FOR OTHER PURPOSES and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
In constructing locks on my improved plan I dispense with the usual pawl or
trigger which forms a stop and which is usually actuated by a separate spring, and
in its place provide a fixed stop in the lock case, thus considerably reducing the
cost. The lock case is of the usual form employed for the purpose, having a plain
slot in the face to allow the bolt or tumbler to pass freely in and out. I construct
the tumbler separate from the eye with an oblong Slot or opening which allows it
to work upon a shoulder formed upon the eye for the purpose; upon the outer face
of the tumbler I form a lip or projecting piece which I usually allow to project
from the lock case; on the lower edge of the tumbler a radial tooth is cut, which
engages with the fixed stop in the lock case provided for that purpose. Upon the,
striking plate a projecting inclined surface is formed; the action of the lock is as
follows, upon closing the door the projecting lip on the tumbler comes in contact
with the corresponding projection on the striking plate provided for the purpose,
this causes the tumbler to rise and release the tooth from the stop, the tumbler is
then forced round or forward by means of a spring or other suitable means into
the staple or receptacle provided for it on the door post. In opening the door the
handle is turned in the ordinary way until it is vertical when the tumbler drops or
is forced down as the case may be and the radial tooth engages with the stop
provided for that purpose, the door can then be pushed open altho' the handle is
released the peculiar construction of the projection on the striking plate which is
rounded and bevilled both ways forming two inclined surfaces allowing the door
to open without again disengaging the tumbler; instead of the inclined surface
projecting from the face of the striking plate I sometimes form it as an indent.
The said invention is illustrated in the accompanying drawings which I will now
proceed to describe:―
Figs 1 & 2 are elevations of my improved lock with the lock plate removed
shewing the parts in different positions.
Fig 3 is a front view of the said lock.
Figs 4 & 5 are elevations of the striking plate.
Figs 6 & 7 are side and end views of the eye or centre piece.
Fig 8 a portion of a door style and post showing the lock as fixed, like letters
indicate the same parts throughout the drawing.
b
The construction of my improved lock as shewn in Figs 1 to 7 is as follows, that
is to say, the tumbler or bolt A has an oblong slot or opening a which fits over the
eye or centre B (Figs 6 & 7) the square part 6 being provided for that purpose,
but is free to move up and down, a radial tooth a' is formed upon the lower end of
the tumbler A; a projecting piece or lip a¹ is also formed upon the tumbler and
this is allowed to project beyond the face of the lock; within the lock case and
forming part thereof I provide a fixed stop C which engages with the tooth as on
the tumbler A, a coil spring D having a loop at one end passing over the pin a³
and connected at the other end to the eye B by means of the tooth d carries the
eye B and with it the tumbler A on the tooth a' becoming released from the
stop C. The projecting lip a¹ is rounded so as to run up the incline E on the

page_text: striking plate Figs 4 & 5, this releases the tooth a' from the stop C and the spring D
carries round the eye B and tumbler A into the position as shewn in Fig 2 in
which position the door is securely fastened the tumbler A being held in the slot G
in the striking plate Fig 4. Upon the striking plate (Figs 4 & 5) I also form a
guard piece F, which forces down the tumbler on the door being opened and
ensures the tooth a² engaging with the stop C as in Fig 1 in which position it is
held until the door is again closed. The projecting lip a¹ on the tumbler A may be
rounded on the front, and the incline E on the striking plate (Figs 4 & 5) rounded
at the back, this allows the door to be pushed open after the handle has been
turned into a vertical position as is usual in opening Railway carriage doors, the
two inclined surfaces of the lip a¹ & E forcing the tumbler backwards into the
lock case which ensures the tooth a passing sufficiently clear of the stop C to
become engaged with it; but by preference I leave the lip a¹ square in front, and
the incline E (Figs 4 & 5) square at the back e¹, by this arrangement after the
handle is turned into the position for opening the door it is necessary to give the
handle an extra turn before the door can be opened, so as to force the lip a¹ clear
of the incline E this arrangement ensures greater security to passengers.
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
First the improved construction of the tumbler or bolt with a slot, & the eye
piece separate enabling the tumbler or bolt to rise and fall independant of the eye
and thus engage or be released from a fixed stop as illustrated and described.
Secondly the construction of the projecting lip upon the tumbler or bolt and
forming part thereof to act as a pawl or trigger and release the tooth from the stop
as illustrated and described.
Thirdly the so constructing the projecting lip on the tumbler or bolt, and the
striking plate that the said lip acts as a latch or fastening when the handle is
released as illustrated and described.
Dated this 31st day of October 1884.