Improvements in Combined Locks and Latches for Railway Carriage and other Doors.
Year: 1893

page_text: Date of Application, 11th Oct., 1893
Complete Specification Left, 11th July, 1894-Accepted, 11th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in Combined Locks and Latches for Railway Carriage
and other Doors.
WILLIAM MAW TROUSDALE of Kingslyn Harrogate in the County of York
Practical Engineer do hereby declare the nature of this invention to be as
follows:-
My improvements consist in making the latch-part or latch shoot of a triangular
form having the nose rounded and the working face or cheek of the latch-part
rounded the opposite side being flat, or in other words the latch-part is practically
in the form of a quarter of a cone having the cheek slightly ball faced but having
the nose and lower extremity rounded and formed, the opposite side being flat, and
is vertically pivotted so that it swivels parallel with the face of the door. The
On the
latch is weighted or acted on by a spring and is made in a frame or case.
boss or centre of the latch-part an arm-piece is fixed the top portion being flat for
locking purposes. Above this pivotted latch-part there is another latch-bolt which
is fixed on a spindle and is not automatic in action but is sustained in position by a
spring and on the boss or centre of this latch-bolt two arm-pieces are fixed. The
spindle or shank has at the outer extremity a T handle or such simple device for
operating the latches, at the other end in many instances a lever-handle may
be used.
When the spindle is twisted the latch-bolt is withdrawn from the striking plate
the arm-piece being fixed in such a position on the boss or centre piece of the latch
coming in contact with the arm-piece of the automatic latch-bolt simultaneously
withdraws it. The other arm-piece serves to fasten the automatic latch-bolt when
the door is fastened.
The latch-bolt spindle is cored out to admit of an internal spindle working in it
and is pivotted in the frame of the latch. There is fixed on the spindle parallel
with the latch-bolt a lock-bolt with an arm-piece arranged with a automatic catch-
piece.
The internal spindle is arranged at the outer extremity with a recessed tapered
square to admit a railway-carriage key being inserted in it and by a twisting action
the lock-bolt is thrown and will engage the automatic latch-piece with the arm of
the latch-bolt and the arm-piece will simultaneously lock them.
In many instances the lock-bolt may not be used but the arm-pieces arranged on
the lock-spindle for locking the latch-bolt. When the door is unlocked by a
railway-carriage-key by a twisting action the lock-bolt and the latch-bolts are
simultaneously unfastened, the automatic catch-piece of the arm-piece being
engaged to the latch-bolt and the arm-piece of the latch-bolt coming in contact
with the arm-piece of the automatic latch-bolt causes it to swivel and be
withdrawn from the striking-plate or the locking arrangement may be used
separately. The striking-plate noseing is arranged to suit the latch-bolt the slot
holes being formed to suit latch-bolts and lock-bolt and are slightly tapered on
the holding side of the hole for wedging purposes so that the door will not rattle
when fastened. The latch-bolt may be applied in many different ways arranged
with lock-bolt, levers, and follower as described in my previous Patents
Improvements in door latches applicable to door locks or doors without locks
No. 8815 dated 25th of May 1891 and No. 9472 dated 4th of June 1891. My
latch bolt and in these Patents may be made double handed having both sides of
the latch cheeks formed as above described and arranged at the lower portion of
the latch-bolt with an holding or catch-piece.

page_text: The slot-hole of the striking-plate is made to suit the latch-bolt and is
sufficiently large so that the cheek of the latch when the door is closed will
not rub against the edge of it and cause it to be pushed open. The bottom
portion of the slot-hole is arranged with a notch in which the catch-piece of the
latch fits to fasten the door.
The noseing portion of the striking-plate is formed to suit the latch-bolt and is
detachable so that it may be fixed at either side of the striking-plate.
The latch-bolt may be arranged with a groove down the centre which serve as
a catch-piece to the latch. The slot-hole of the striking-plate being arranged to
suit the latch with a centre or holding-piece for the groove of the latch-bolt to
fit into to fasten the door. The latch-bolt in many instances when inade with a
groove down the centre may have a roller fitted at the lower extremity which
form a catch-piece and serves to reduce the friction when withdrawing it from the
notch at the lower extremity of the slot-hole of the striking-plate which it fits
into to fasten the door.
Dated this 23rd day of November 1893.
WILLIAM MAW TROUSDALE.
DESCRIPTION OF DRAWINGS.
Fig. 1, is an elevation (the case being in section) of my invention showing
arm-pieces upon latch-bolts engaged with each other, as when the door is fastened
or closed, but not locked.
Fig. 2, is an elevation (the case being in section) showing the arm-pieces upon
the latch-bolts released, and the relative positions of the parts when such takes
place.
Fig. 3, is a front elevation.
Fig. 4, is a plan.
Fig. 1A, is a section of Fig. 1, showing locking arrangement, or lock-bolt
disengaging latch-bolt, for unlocking purposes.
Fig. 1, is a further section showing locking arrangement or lock-bolt engaging
latch-bolt for locking purposes.
Fig. 1, is an enlarged detail view, showing lock-bolt engaging latch-bolt.
Figs. 5, 7, 9, and 10 are elevations, and
Figs. 6, 8, and 11 are sections of modifications according to my invention.
My improvements consist in making the latch-part or latch-shoot of a triangular
form having the nose rounded and the working face or cheek of the latch-part
rounded the opposite side being flat, or in other words the cheek portion of the
latch-bolt is practically in the form of a quarter of a cone having the cheek
slightly ball-faced and the nose and lower extremity rounded, the opposite side
being flat and is pivotted so that it swivels parallel with the face of the door.
The latch-bolt A is weighted or acted upon by a spring A' and is made in a
frame or case.

page_text: On the boss or centre of the latch-bolt A an arm-piece B is fixed, the top
portion being flat for locking purposes.
Above the pivotted latch-bolt A there is another latch-bolt C which is fixed on
a spindle H aud has a catch-piece J, is non-automatic in action, and is sustained
in position by a spring. On the boss or centre of this latch-bolt C two arm-
pieces E and D are fixed. The spindle H or shank of this latch-bolt C has at
the outer extremity a T handle G, or such simple device for operating the latches.
At the other end of the spindle H, a lever handle I may also be used.
When the spindle H is twisted the latch-bolts A and C are withdrawn from
the striking plate, the arm piece D being fixed in such a position on the boss or
centre of the boss of the latch-bolt C, that on coming in contact with the arm
piece B of the automatic latch-bolt A it is simultaneously withdrawn. The
other arm-piece E serves to fasten the automatic latch-bolt A when the door is
fastened.
The latch spindle H is cored out to admit of an internal spindle F working in
it, and is pivotted in the frame of the latch. The internal spindle F is arranged
at the outer extremity with a recessed tapered square B₁ to admit a railway
carriage key being inserted for locking and unlocking purposes.
The internal spindle F is arranged with a lock-bolt. M upon a boss or centre-
piece M¹ which is provided with a recess or notched out part J which forms an
automatic catch-piece, and further has an arm-piece R, and spiral spring J¹ for
engaging as hereinafter explained the lock-bolt when in use.
An arm-piece S is also upon the said boss M¹ and works in a diagonally formed
slot hole K.
The arm-pieces R and L arranged on the centre-piece or boss M¹ are for
locking and unlocking the latch-bolts A and C. When the door is fastened or
closed by the latch bolts A and C and it is required to lock them a railway
carriage key is inserted in the tapered square B₁ of the lock-spindle F and by
means of a twisting action the automatic catch-piece J upon the boss M' (arranged
on the spindle F with spiral spring J') is caused to slide on the spindle F and
come in contact with the catchpiece J on the centre-piece of the latch-bolt C so
allowing the spring J¹ to be expanded which action engages the lock-bolt M with
the latch-bolt C by means of the catch-pieces aforesaid, and causes the arm-
piece R fixed on the lock bolt M and the arm-piece E to come into position with
the arm-piece B of the latch-bolt A, which arm-piece B is large enough for both
the said arm-pieces R and E to lock on so causing them to be fastened for
locking purposes.
The other arm piece L fixed on the centre-piece M' of the lock bolt M, is for
unlocking purposes, and disengaging the latch-bolts A and C.
When this is required to be done the lock spindle F is twisted, the arm-piece L
of the lock-bolt M comes in contact with the arm-piece B of the automatic latch
bolt A, causing it to swivel and simultaneously disengages it, at the same time
the arm piece working in the diagonally formed slot hole K causes the boss M¹
to slide in the spindle F which compress the spiral spring J and disengages the
lock-bolt M, by releasing the catch-pieces J and J, so unlocking the latch-bolts A
and C. The lock-bolt M in some cases may not be used, and the catch-piece J
and J' arranged on the lock-spindle F as above described may be used for
locking and unlocking purposes.
The latch-bolts may be used separately.
The striking-plate noseing is arranged to suit the automatic latch-bolt A and the
slot holes are slightly tapered on the holding side of the hole for wedging purposes
so that the door will not rattle.
The latch-bolt may be applied in many different ways arranged with lock-bolt,
levers, and follower as described in my previous Patents " Improvements in
door latches applicable to door locks or doors without locks," No. 8815 dated
25th May 1891 and No. 9472 dated 4th June 1891.
My latch-bolts and in these Patents may be made double handed having both

page_text: sides of the latch cheeks formed as above described and arranged at the lower
portion of the latch-bolt with a holding or catch piece. This is illustrated in
Figs. 5 to 11, in which the slot hole P of the latch-bolt N is made to suit it,
and is sufficiently large, that the cheek of the latch-bolt N when the door is
closed will not rub against the edge of it, and cause the door to be pushed open.
The bottom portion of the slot-hole P' is arranged with a notch P³ in which the
catch piece N' of the latch N fits to fasten the door.
The noseing portion of the striking-plate in many instances may be made
detachable so that it may be fixed on either side of the striking plate.
The latch-bolt N may be arranged with a groove N down the centre which
serves as a catcb-piece to the latch-bolt N. The slot hole P¹ of the striking plate
being arranged to suit the latch-bolt N with a centre or holding piece for the
groove of the latch bolts N to fit into to fasten the door. The latch-bolt in many
instances when made with a groove down the centre may have a roller O fitted
in it at the lower extremity which forms a catch-piece for fastening purposes and
serves to reduce the friction when withdrawing it from the notch of the slot-hole.
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.
1. In combined locks and latches for railway carriage and other doors, the
combination of a latch-bolt A having an arm-piece B and a latch-bolt C (fixed on
a spindle H) having arm-pieces E and D operating as and for the purposes such as
shown and described.
2. In combined locks and latches for railway carriage and other doors, the
combination of a latch-bolt A having an arm-piece B, a latch bolt C (fixed on
a spindle H) having arm-pieces E and D and a lock-bolt M having a catch-piece .J,
operating as and for the purposes such as shown and described.
3. In combined locks and latches for railway carriage and other doors, the
combination with a spindle H of an internal spindle F having a recessed or
tapered square B' substantially as and for the purposes shown and described.
4. In combined locks and latches for railway carriage and other doors, the com-
bination of a latch-bolt A having an arm-piece B, a latch bolt C (fixed on a
spindle H) having arm pieces E and D, a lock-bolt M arm-piece L, catch-
piece J, spring J and slot K, substantially as and for the purposes shown and
described.
5. In combined locks and latches for railway carriage and other doors, the
combination of latch-bolts N, catch-pieces N', slot-holes P¹, and notch P³,
substantially as and for the purposes shown and described.
6. In combined locks and latches for railway carriage and other doors, the
combination with latch-bolts N of runners or rollers O, substantially as and for
the purposes shown and described.
ليمي
ג
1004
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent to the Applicant.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent to the Applicant.