Improvements in Flush-bolts.
Year: 1891

page_text: Date of Application, 30th July, 1891
Complete Specification Left, 30:h Apr., 1892-Accepted, 4th June, 1392
PROVISIONAL SPECIFICATION.
Improvements in Flush-bolts.
We, SAMUEL SHIRTCLIFFE, of 47, Beaconsfield Road, South Tottenham,
Foreman Cabinet Maker, and WILLIAM ANGUS, of 66, Tabernacle Street,
Finsbury, Manufacturer, both in the County of London, do hereby declare the
nature of this invention to be as follows:-
This invention relates to flush-bolts especially designed for use upon double
doors, the object of the said invention being to provide a bolt which, when
attached to one door, shall be operated to lock it by the closing of the second
door.
According to our invention the case of the bolt is advantageously made in the
shape of a right angled triangle, the two sides of the case being flat so that in order
to fit the said case to a door it is only necessary to form a plain cut or slot at
one corner.
The bolt is pivotted within the case and at one end adapted to engage with a
suitable slot when pushed out of the case, the other end of the said bolt being
inclined or shaped in such a manner that, when the second door is closed, the inclined
end will be pressed into the case thereby pressing the other end into the slot. A
spring is provided for withdrawing the locking end of the bolt into the case when
the doors are opened.
Did she onch dave of T.1, 1001
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Flush-bolts.
We, SAMUEL SHIRTCLIFFE, of 47, Beaconsfield Road, South Tottenham,
Foreman Cabinet Maker, and WILLIAM ANGUS, of 66, Tabernacle Street,
Finsbury, Manufacturer, both in the County of London, 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 :-
This invention relates to bolts especially designed for use upon double doors
or gates, the object of the said invention being to provide a bolt which, when
attached to one door or gate, shall be operated to lock it by the closing of the
second door or gate.
According to our invention the case of the bolt is advantageously made in the
shape of a right angled triangle, the two sides of the case being .Hat so that in
order to fit the said case to a door it is only necessary to form a plain cut or slot
at one corner.
The bolt is pivotted within the case and at one end adapted to engage with a
suitable slot when pushed out of the case, the other end of the said bolt being
inclined or shaped in such a manner that, when the second door is closed, the
inclined end will be pressed into the case thereby pressing the other end into
the slot. A spring is provided for withdrawing the locking end of the bolt into
the case when the doors are opened.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawings, in which :-
Figure 1 is a sectional elevation of a portion of a pair of doors having our
improved bolt applied thereto :

page_text: Figure 2 is a section on the line xr, Figure 1; and,
Figure 3 is a section on the line y y, Figure 1:
Figures 4 and 5 are respectively a sectional elevation and a horizontal section
shewing the unlocked position of the bolt when one of the doors is open :
Figures 6 and 7 illustrating in sectional elevation and in plan a modified form
of bolt.
Similar letters of reference indicate corresponding parts in the several figures.
a indicates the casing of the lock, the bolt, and c the spring by means of
which the bolt is unlocked when one of the doors is opened. As shewn in
Figures 1 to 5 the said casing is of triangular shape and is inserted into a slot cut
in the corner of one of the doors.
The bolt is of such shape and is pivotted in the casing in such a manner that
one end b¹ normally projects from the casing, as shewn in Figure 4, and so that
when the adjacent door strikes against the said end it will be forced within
the casing and the end 62 forced out of the casing into a suitable slot d in the door-
framing, as shewn in Figures 1 and 2.
a
In order to prevent the portion of the door which impinges against the
projecting end of the bolt from being damaged, we advantageously provide
metal covering at this part, for instance, we employ a screw d' as shewn in
Figures 1, 3 and 5.
The bolt shewn in Figures 6 and 7 is especially applicable for use upon heavy
doors or gates. The continuation of this modified form of bolt is substantially
the same as that herein before described, except that the casing is made square and
is adapted to be secured to the face of one of the doors. In this case we preferably
place upon the other door a striking-plate e designed to impinge against the
projecting end of the bolt.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A bolt the bolt proper of which is pivotted in its casing so that one end normally
projects therefrom and is so arranged that when this end is pressed inwards the
other end will be caused to project, substantially as described.
2. The manufacture and use of bolts, substantially in the manner hereinbefore
described and illustrated in Figures 1 to 5, and Figures 6 and 7 of the accompanying
drawings.
Dated the 20th 3.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.