IMPROVEMENTS IN LOCKS OR FASTENINGS FOR RAILWAY " CARRIAGE AND OTHER DOORS
Year: 1883

page_text: LETTERS PATENT to Henry Parkin of Albert Terrace Bow and Charles James
Reynolds of Downs Park Road Clapton both in the County of Middlesex for
an Invention of IMPROVEMENTS IN LOCKS OR FASTENINGS FOR RAILWAY
"
CARRIAGE AND OTHER DOORS
"
ܢ܂
PROVISIONAL SPECIFICATION left by the said Henry Parkin and Charles
James Reynolds at the Office of the Commissioners of Patents on the
8th May 1883.
HENRY PARKIN of Albert Terrace Bow and CHARLES JAMES REYNOLDS of
Downs Park Road Clapton both in the County of Middlesex " IMPROVEMENTS
IN LOCKS OR FASTENINGS FOR RAILWAY CARRIAGE AND OTHER DOORS
"
2 This Invention has for its object improvements in locks or fastenings for
railway carriage and other doors.
Door locks or fastenings having turning bolts or latches are now sometimes
formed in such a manner that when the latch has been lifted and the door.
opened the latch is held up by a catch and cannot again be depressed by the
spring which acts upon it until the door is closed so that in this way the
handle cannot be turned into a horizontal position except when the door is
properly secured.
Various ways of effecting this object have been proposed but all have the defect
that the catch by which the latch is held up when the door is open gets quickly
worn away and becomes unserviceable owing to its being always subjected to the
pressure of the main spring and having to be turned or moved whilst so subjected
to pressure.
To remedy this we use a retaining catch which when the latch has been lifted
and the door opened does not retain the latch when fully raised but allows the
latch to drop a distance before retaining it. When the door is being closed we
cause the outer end of the latch to come against an incline on the striking plate
and be thereby lifted a distance before any movement is given to the retaining
catch. The retaining catch is therefore relieved from all pressure or contact before
any movement is given to it.

page_text: We also according to our invention adapt similar retaining catches to spring
latch locks which are formed with sliding bolts instead of with turning latches.
The retaining catch may be carried by and move with the bolt and be acted on
by a spring in such manner that when the bolt has been drawn back and the door
opened the retaining catch shall be caused to catch behind a stop formed on or in
the lock case, and as in the lock first described the catch is so formed as not to
retain the bolt when fully drawn back but only to retain it after it has been
allowed to shoot forward a distance.
In the same way also when the door is being closed, the outer end of the bolt
is made to come against an incline on the striking plate and is thereby forced
inwards and carries the catch back with it. Consequently the part of the catch
which before caught behind the fixed opposing surface on or in the lock plate is
moved away from this surface. Whilst the bolt is so held back the retaining
catch now relieved of all strain upon it is turned or moved into such a position
as not to come in the way of the fixed opposing surface when the bolt shoots
forward.
The turning or moving of the catch we effect by a projecting piece standing
out in front of the face plate of the lock being made to slide on an incline on
the striking plate. The catch may be a lever coupled by a pin to the bolt either
above or below or on one side of it. The rear arm of the lever we make to
make to project a distance in front of
incline on the striking' plate as above
DI:
form the catch and its front arm we
the face plate to be acted upon by an
.described.
In place of the retaining catch being carried by and moving with the bolt
it might be carried by the case of the lock and yet be caused to act in the same
manner.
P
.
124\
By constructing locks in the above way so that the bolt has to be moved back
a distance before its retaining catch is turned or moved into a position to set it
out of action, undercut catches may be used whereby a very secure hold is
obtained and yet when the door is being closed the catch can be turned or moved
out of the way with the greatest ease and without the engaging surfaces.being
subjected to any wear or pressure.
We also form latch locks in such a way that the latch is held indifferently at
either extremity of its movement by the action of the lock spring. For this
purpose we form the axis of the latch with a short projection standing out from it
and we cause a slide having a wedge shaped end to be thrust by the spring of the
lock against the end of the short projection in a direction radial to the axis
when the latch is up the short projection, above mentioned comes on one side of
'the wedge shaped end of the slide and when down the short projection comes on
the opposite side or face of the wedge and the latch is consequently held in either
position by the action of the spring the striking plates to be used with locks
of this construction we make with two inclines one to act on the under side
of the latch to lift it the other to act on the top of the latch to press it down.
In these locks the latch and the projection may be at any desired angle to one
anothe

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Parkin and Charles James Reynolds in the Great Seal Patent
Office on the 8th November 1883.
HENRY PARKIN of Albert Terrace Bow and CHARLES JAMES REYNOLDS of
Downs Park Road Clapton both in the County of Middlesex "IMPROVEMENTS
IN LOCKS OR FASTENINGS FOR RAILWAY CARRIAGE AND OTHER DOORS
"
This Invention has for its object improvements in locks or fastenings for railway
carriage and other doors.
For these purposes we in some cases employ a turning latch to which a spring
is applied in such manner that it will retain the latch indifferently either in the
locked or unlocked positions.
}
The spring presses a slide having a wedge shaped end against a projection upon
the latch.
"
г
When the latch is turned by the handle or otherwise the projection passes the
end of the wedge from one side of it to the other, the slide retiring and advancing
again in a radial direction.
The striking plate for the latch has two inclines, one to lift the latch as the door
closes and the other to force it down behind the retaining projection: of the
striking plate...
).
Figure 1 is a side view of a lock and striking plate of this construction the
cover plate of the lock is removed. Figure 2 is a front view of the striking plate.
In these figures a is the lock case, 6 the latch capable of turning therein from the
position in which it is shown in full lines to that in which it is represented in
dotted lines and vice versa. b' is a square opening for receiving the spindle of the
handle or a key. 62 is a projection upon the latch and c is a slide with a wedge
shaped end pressed forward against the projection-6 by the spring & bearing
against a shoulder upon the slide. The latch bis rounded on the face: which
comes against the inclines of the striking plate as is shown by Figure 3. In
closing the door the underside of the latch first comes against the incline.e on the
striking plate which raises the latch and then the upper side of the latch comes
against the second incline. f. on the striking plate and this forces the latch downwards
behind the shoulder g.
"
In some cases we provide the lock with a catch which prevents the latch
being turned downwards when the door is open and a projection on the striking
plate which releases this catch as the door is closed. The position of the handle will
then indicate at a glance whether the door be open or closed.
0
Figure 4 is a front view of a turn latch lock of this construction with the cover
removed. Figure 5 is a back view of the same with the striking plate in position.
In this view the latch is shown turned up to its extreme against a projecting stop
in the lock case; in this position it stands so long as the door
open. Figure 6 is
a side elevation of the striking plate. In these figures a is the lock case, b the
turn latch, it has a square hole through its boss adapted to receive a spindle and
handle. c is a slide with a wedge shaped end, it is guided in a suitable manner in
the lock case and is thrust outwards by the coiled spring d. The slide c presses
against a projection 6' on the latch and serves to retain it in either of the positions;
in which it is shown.
e is a retaining catch acted upon by a flat spring fattached to the lock case.
The turn latch bas on the circumference of its boss a projection.br.
When the door is open and the latch raised, it is retained in position by the catche
so that it cannot be turned down even by means of the handle,

page_text: "
When it is desired to close the door no turn of the handle is needed but the door
is closed by gentle pressure.
The outer end of the retaining catch e first comes against a projection or incline
g formed in the striking plate g and turns slightly on its pin or axis moving its
hooked end clear of the projection 6s on the latch.
An incline formed on the head of the latch then comes against a second and
downwardly acting incline g³ in the striking plate and the latch is thus forced
downwards into a horizontal position behind the shoulder g³ in the striking plate.
Here the latch is again retained by the end of the slide c being pressed onto the
inclined projection b
The incline g¹ supports the end of the catch e so that the catch does not interfere
with raising the latch to open the door by the key or handle and the hook of the
retaining catch never comes against the projection 6ª unless the handle is turned
when the door is open..
We also according to our invention construct locks with sliding bolts and
retaining catches to retain the bolt in the unlocked position when the door is open;
and these parts and the striking plate are so arranged that in closing the door the
catch is first released by pressing back the bolt; the catch is then moved out of
the way or disengaged and finally the bolt is allowed to shoot forward behind the
retaining shoulder of the striking plate.
In opening the door the bolt is drawn back by the handle and the retaining
catch drops in before the bolt is clear of the striking plate.
Figure 7 is a side view of a sliding bolt or draw latch lock of this construction
with the latch or bolt in the position it occupies when the door is open.
Figure 8 is a section of the lock showing the working parts.
Figure 9 is a side view of the striking plate, Figures 10 are sections of the same
taken on the lines 1. 1. and 2. 2. and Figure 11 is a plan of the retaining catch
and spring. In these figures h is the lock case i the latch which has a tail. Its
front end is sloped or rounded off where its rubs against the striking plate and it is
shot forward by a flat coiled spring j surrounding the tail of the latch. k is a
retaining catch acted upon by a flat spring attached to it and which bears against
the cover plate of the lock. m is a tumbler through which the handle spindle
passes.
The retaining catch moves with the latch. The catch k serves to prevent the
latch being shot forward, whilst the door is open, beyond the position it occupies in
Figure 7. In this position the hooked end k¹ of the retaining catch drops into a
hole h+ formed in the lock plate. To close the door no turn of the handle is needed
it is effected by a simple pressure on the door. The rounded or inclined side of
the latch first comes against an incline or curved surface n¹ on the striking plate n
and forces the latch inwards sufficiently to release the catch k. The outer end of
the catch k then comes against a projection n which lifts the hooked end clear
from the hole in the case; further movement of the door allows the latch i to drop
behind the incline n¹, it then shoots forward to its fullest extent and securely
fastens the door. The releasing catch moves with it but the hook is kept from
rubbing on the interior of the lock case by its outer end resting against the
projection at n³.
By constructing locks in the above way so that the bolt has to be moved back a
distance before its retaining catch is turned or moved into a position to set it out
of action, undercut catches may be used whereby a very secure hold is obtained
and yet when the door is being closed the catch can be turned or moved out of the
way with the greatest ease and without the engaging surfaces being subjected to
any wear or pressure.
Figure 12 is an elevation of an arrangement whereby we are enabled to have
the handle inside the door to actuate the locks further from the edge of the door
than if it were placed on the lock spindle. In this figure t is the handle outside
the door t¹ the lock spindle, u is the handle inside the door it turns on a separate
spindle carried by a plate secured to the door, motion is transmitted from the handle

page_text: by means of the lever u¹ fast to it by the connecting link v which is attached to
the lever t2 which is fitted on a square on the lock spindle.
Having thus described the nature of our said invention and the manner of
performing the same we would have it understood that we claim :-
First. The construction of latch locks with springs so applied as to retain the
latch in either the locked or unlocked position and with two inclines upon the
striking plate one to raise and the other to press the latch downwards substantially
as described.
Second. The construction of latch locks with springs so applied as to retain the
latch in either the locked or unlocked position with a catch to retain the latch in
the unlocked position when the door is open and with an incline on the striking
plate to press the latch downwards and to remove the latch out of the way
substantially as described.
-
Third. The construction of locks having sliding bolts with catches upon the
bolt retaining the bolt when the door is opened and as the door is closed liberated
and disengaged by the operation of the striking plate substantially as described.
Fourth. Our improved lock or fastening for railway carriage and other doors
substantially as herein described.
In witness whereof we the said Henry Parkin and Charles James Reynolds
have hereunto set our hands and seals this eighth day of November in the year
of our Lord One thousand eight hundred and eighty three.
A
T
ANALD