Improvements in Door Fastenings.
Year: 1894

page_text: Date of Application, 4:h Apr., 1894
Complete Specification Left, 16th Nov., 1894-Accepted, 29th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Door Fastenings.
I JAMSHEDJI HIRAJI of Tardeo, Bombay, India, Mill Manager, do hereby
declare the nature of this invention to be as follows:-
My said invention relates to catches or fastenings for doors and consists of a
projecting bar attached to the door itself and of a swinging lever latch or catch
attached to and having its fulcrum in the door frame or other fixed point.
When in its lowest or approximately horizontal position a projection underneath
the said swinging latch takes against the projecting bar and prevents the opening
of the door. A strut is hinged to the swinging latch in such a manner as to lie
nearly horizontal when the door is closed but when the swinging latch is raised
the said strut falls by its own gravity into a vertical or nearly vertical position
and resting on the projecting bar prevents the swinging latch from falling. While
in this position the door may be opened whereupon the swinging latch falls into
its lowest position with the strut hanging downwards.
The lower edges of the swinging latch and the strut are rounded or inclined in
such a manner that during the closing of the open door the projecting bar in passing
under them raises the latch and also the strut so that when the door is shut they
fall into their first position and the latch automatically secures the door.
Dated this Third day of April 1894.
E. T. WHITELOW, A.M. Inst. C.E.,
70, Deansgate, Manchester, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Door Fastenings.
I JAMSHEDJI HIRAJI of Tardeo, Bombay, India, Mill Manager, 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 and accompanying drawings in which :-
Figure 1 is a side elevation showing the door secured,
Figure 2 is a side elevation with the door released and ready for opening, and
Figure 3 is a front elevation of Figure 2.
The door D opens outwardly from the plane of the paper with reference to
Figure 3.
In all the drawings the same letters indicate the same parts.
My said invention relates to catches or fastenings for doors and consists in its
essential features of a projecting bar d attached to the door D and of a swinging
lever latch or catch a provided with a hinged strut b attached thereto and having
its fulcrum at a¹ in the door frame F or other fixed place. When in its lowest or
approximately horizontal position the projection or lip a² of the lever a takes over
or engages with the projection d and thus prevents the opening of the door.
The strut b is freely hinged to the lever a in such a way as to lie nearly horizontal
when the door is closed as shown in Figure 1. When the fore end of the lever a
Duins 17

page_text: is lifted the strut falls by its own gravity into a vertical or nearly vertical
position and resting on the projection d as shown in Figure 2 it holds up the
lever a and the door may be opened. On the opening of the door the lever a falls
into its lowest position with the strut hanging downwards. The front end of
the lever a and the strut bare rounded in such a manner that during the closing of
the door they are both raised by the passage of the projection d and when the door
is shut they fall into their first position and automatically secure the door. A
projection a³ ou the underside of the lever a prevents it falling too low when the
door is opened.
Where it is desired to control the fastening from the inside a prolongation of
the lever a indicated by dotted lines at at in Figure 1 passes through the door
framing into the place to which the door gives access.
To reinforce the gravity of the strut and to cause it to fall with greater
certainty into the position shown in Figure 2 an accessory swing bar c may be
hinged to the lever a in such a way that the free end thereof bears continually
against the strut b. A spring may be used for the like purpose.
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 1
claim is :-
1. A lever latch for a door fastening substantially as set forth and shown.
2. In a door fastening the combination of a hinged lever a and a strut b
substantially as and for the purpose described and shown.
3. In a door fastening having a lever catch such as a engaging with a projection
such as d the strut b substantially as and for the purpose set forth.
4. The combination of the lever a the strut and the projection & substantially
as and for the purpose set forth and shown in the accompanying drawings.
Dated 15th day of November 1894.
E. T. WHITELOW, A.M. Inst. C.E.,
70, Deansgate, Manchester, Agent for the Applicant.