An Improved Automatic Bolt for Double-doors.
Year: 1888

page_text: Date of Application, 23rd Aug., 1888
Complete Specification Left, 23rd May, 1889-Accepted, 13th July, 1889
PROVISIONAL SPECIFICATION.
An Improved Automatic Bolt for Double-doors.
I, CHARLES YOUNG, of 2, Cromwell Villas, Granville Road, Tunbridge Wells, in the
County of Kent, Carpenter, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the double doors of book cases, show cases, wardrobes and
the like, which open outwards, and is intended to fasten one of the said doors by the
act of closing the other door, so that the second door being then locked or otherwise
fastened to the one first closed, both are secured.
It consists of a small angular bracket fastened on the back of the inner door, which
supports a sliding bolt, which bolt may be either straight bent or curved, and is so
arranged as to fall by gravitation and project a short distance through the rabbot of
the inner or first closed door.
When the second door is closed its projecting rabbet which covers the rabbet of the
first door, pressos inwards the projecting lower end of the sliding bolt, which then
rises through the bracket at its upper extremity and shoots into an aperture formed to
receive it in a horizontal shelf or wood block placed just above the top of the door.
The second door being then fastened or locked to the first, both are secured.
No spring or lever is required. The sliding bolt may work in a tube or in sockets,
and may be round square or of any other preferred section. Striking plates may be
used at each end of the bolt.
1000
COMPLETE SPECIFICATION.
An Improved Automatic Bolt for Double Doors.
I, CHARLES YOUNG of 2 Cromwell Villas Granville Road Tunbridge Wells in the
County of Kent, Carpenter, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer
tained in and by the following statement :-
This invention relates to the double doors of book cases show cases wardrobes,
coach houses, theatres, and all kinds of double or folding doors which open outwards
and is intended to fasten one of the said doors automatically by the act of closing the
second or outer door so that when the second door is locked or otherwise fastened to
the one first closed both are secured.
Similarly when the outer or second door is unfastened the first or inner door is
automatically released.
It consists of a small angular bracket stay or tubular chamber attached to the
inside of the inner door which supports a sliding bolt which bolt may be either straight
bent or curved and is so arranged as to project for a short distance at its lower end
through the rabbet of the said inner door when in its unfastened position and to rise
when its projecting end is pushed in, so that its upper end engages with a hole or
socket in the fixed frame or head of the case, or cupboard, placed conveniently to
receive it. The fall of the bolt may be left to gravitation or may be effected or
assisted by means of a spring in any of the many well known ways.
In the accompanying drawings Fig. 1 shows a sectional elevation of my improved
bolt in its unfastened position.
Fig. 2, shows a similar elevation of the bolt in its fastened position.

page_text: A is the sliding bolt.
B the bracket or stay. C the projecting end of the bolt.
D is the rabbet of the inner door, and E the frame of the cupboard, F the socket in
frame.
It will be seen that when the second door is closed its projecting rabbet which covers
the rabbet D of the first door presses inwards the projecting lower end of the sliding
bolt A which then rises through the upper end of the bracket B and engages with the
frame For a block placed to receive it above the top of the door. The second door
being then fastened or locked to the first both are secured.
No spring or lever is required when the bolt is used on the top of the door. Should
it be required to work in a reversed position at the bottom of the door, it can be held
in the unfastened position by means of a small spring as before stated.
The sliding bolt A may be hollow or solid, and of any preferred section.
Striking plates may be used at each end of the bolt.
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 I
claim is.
1. A sliding bolt for automatically fastening the inner door of two folding doors as
herein explained and sot forth.
ay
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Patent Agent.