A Device for Unlocking Railway Carriage Doors from the Inside.
Year: 1899

page_text: Date of Application, 8th June, 1899
PROVISIONAL SPECIFICATION.
A Device for Unlocking Railway Carriage Doors from the
Inside.
I, WILLIAM AULD, of 54, Gordon Street, Glasgow, Insurance Broker, do
hereby declare the nature of this invention to be as follows:-
At present various devices are in use whereby railway carriage doors can
be unlocked from the inside of the carriage but such devices possess the dis-
advantage that they are readily accessible to children who may, as a conse-
quence, at an unguarded moment, open the door with the possibility of a
dangerous or fatal accident.
My invention has for its object to provide a device for opening the carriage
door which, whilst being quite easily manipulated by grown up people, is not
liable to be tampered with by children.
In carrying out my invention I let into the side post of the door a metal
frame within which a bolt can freely work said bolt being held normally
depressed by means of a spiral or other suitable spring. At the inside of the
carriage frame and well up out of reach of children a cranked lever is pivotted
within a suitable jaw or bracket and the end of this lever is capable of gripping
a roller or equivalent inserted in a slot in the bolt which slot is made for the
reception of the end of the lever. The bolt is, at a suitable height, made with
a slot for the reception of the locking bolt of the carriage lock. The lower end
of the bolt is provided with a roller or wheel which, when the bolt is raised by
pulling the lever aforesaid, acts upon the lever or tumbler of the ordinary door
locks and forces it back out of engagement with the recess in the frame so that
the door can be pushed open. Whenever the lever handle is released the spring
forces the bolt back into its original position.
712 do
f T 1800
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent.
COMPLETE DIEUIFICATION.
A Device for Unlocking Railway Carriage Doors from the
Inside.
I, WILLIAM AULD, of 54, Gordon Street, Glasgow, Insurance Broker, 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:-
At present various devices are in use whereby railway carriage doors can

page_text: be unlocked from the inside of the carriage but such devices possess the dis-
advantage that they are readily accessible to children who may, as a conse-
quence, at an unguarded moment, open the door with the possibility of a
dangerous or fatal accident.
My invention has for its object to provide a device for opening the carriage
door which, whilst being quite easily manipulated by grown up people, is not
liable to be tampered with by children."
In order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings, whereon,
Fig. 1 is a front or face view of the side post of a carriage door frame.
Fig. 2 is a view (from the outside of the carriage) of the side post and part
of the window frame of the carriage with the front cover (see Fig. 3) removed.
Fig. 3 is a section on the line A-A Fig. 2.
In carrying out my invention I let into the side post a of the door frame a
metal case or frame b which is, preferably, of rectangular shape with closed
ends and an open front which latter may be covered by a removable cover a.
Within this case a long bolt c is so fitted as to freely work therein and this
bolt is normally held depressed by means of a spiral or other suitable spring d
fitted in the upper end of the case as clearly shown at Fig. 2. This spring acts
upon the upper end of the bolt.
These
At the inside of the carriage and well up out of reach of children a hand
lever e is fitted said lever being secured to a pin f which passes through a
bearing in the wood work of the carriage and has secured rigidly to its end a
lever g made with a tapered end which enters a slot in the bolt c.
parts are clearly shown at Fig. 2 where the wood work is broken away so as to
show the lever g, the lever being indicated by the dotted lines. The tapered
end of the lever g bears against the underside of a small roller i secured in
the slot of the bolt.
The bolt c is, at a suitable height, made with a slot j for the reception of
the locking bolt of the carriage-door lock. Of course a corresponding slot is
made in the wood work of the side post as shown at 1 Fig. 1.
The lower end of the bolt c is provided with a roller or wheel k which is
capable of acting upon the lever or tumbler of the ordinary door lock or fasten-
ing. As indicated in Fig. 1, by the dotted lines, the lower end of the bolt c
may be cut away at one side and the wheel secured to the side of the bolt by
the pivot stud . m is the slot in the side post for the reception of the lever of
the door lock or fastening.
The dotted lines at n indicate the lever of the door fastening.
As will be seen at Fig. 2 the handle or hand lever e is fitted at an angle to
the lever g.
With this arrangement whenever it is desired to open the carriage door from
the inside the handle e is pushed up with the result that the bolt c is lifted
against the action of the spring d. The upward movement of the bolt causes
the wheel k to force up the lever n into the position indicated at n¹ and out of
engagement with the slot m so that the door can be pushed open from the
inside. The dotted circle at indicates the position assumed by the wheel k
when the bolt is raised. Whenever the lever handle is released the spring d
forces the bolt back again into its original position.
It is of course obvious that instead of having a handle e to push up a handle
may be arranged to pull down and thereby cause the lever g to raise the bolt.
Such a handle might take the form of a rearwardly extending lever secured to
the pin instead of the forwardly extending lever e.
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 consider novel and desire to claim is:-
A device for unlocking railway carriage doors from the inside made and

page_text: operating substantially as hereinbefore described with reference to the drawings
annexed.
Dated this 7th day of March 1000
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent..