An Improved Bolt or Latch for Doors and Windows.
Year: 1898

page_text: Date of Application, 16th Aug., 1898
Complete Specification Left, 16th May, 1899-Accepted, 16th Aug., 1899
An Improved Bolt or Latch for Doors and Windows.
I, CHARLES ROTRU, of 17, Rue Neuve, Roubaix (Nord), in the Republic of
France, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The present invention relates to an improved safety bolt or latch by means
of which it is possible to keep ajar the door or window to which it is attached,
without its being possible for the said door or window to be further opened
from the outside.
My bolt can also be employed to ensure the secure closing of the door or
window to which it is fitted.
The invention consists of a metallic tongue or rod forming a bolt, enclosed
in a metal case, said case being fixed to a plate which is secured to a door or
window in the usual way.
The bolt is guided in its horizontal movement by a pin or peg which is rivetted
to the box and slides in a horizontal slot made in the bolt. The bolt is also
provided at its lower side with steps or crosscuts which answer the purpose of
a rack and into which engage the teeth of a pinion worked by means of a key
or thumb-bit from outside the said case.
The bolt has also a flat spring, which is placed above it and is provided with
a small pin or lug which engages with a series of notches or holes made in the upper
side of the bolt. Each of these notches corresponds to the space between two
of the steps or crosscuts of the aforesaid rack in the underside of the bolt. This
spring serves to hold the bolt in any position in which it is placed.
On to the frame or case of a door or window, is fitted a metal plate, on to
which is hinged one end of a small slotted or grooved bar, the other end of which
is free. When the actuating key or thumb-bit of the bolt is turned one quarter
of a revolution, the said bolt enters the slotted bar and the door can then be set
ajar. The bolt by sliding in the groove or slot of said plate to the end of the
slot in same, will prevent the door from opening any further.
If instead of being turned one quarter of a revolution, the actuating thumb-
bit is turned one half of a revolution, the bolt will engage with an eye or staple
fixed on the aforesaid plate, and the secure closing of the door is obtained.
Dated this 16th day of August 1898.
An Improved Bolt or Latoh for Doors and Windows.
I, CHARLES ROTRU, of 17, Rue Neuve, Roubaix (Nord), in the Republic of
France, Manufacturer, do hereby declare the nature of this invention and in
[Price 8d.1

page_text: what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The present invention relates to an improved safety bolt or latch by means
of which it is possible to keep the door or window to which it is attached, ajar,
without its being possible for the said door or window to be further opened
from the outside.
My bolt can also be employed to ensure the secure closing of the door or
window to which it is fitted. The invention consists of a metallic bar or rod
forming a bolt, enclosed in a suitable casing, said casing being fixed to a plate
which is secured to a door or window in the usual way.
The bolt is guided in its horizontal movement by a pin or peg which is rivetted
to the box and engages with a horizontal slot made in the bolt. The bolt is
also provided on its lower side with a rack, the teeth of which engage those of
a pinion worked by means of a key or thumb-bit from outside the casing which
is placed above it. To define the movement of the bolt the casing is fitted with a
spring above the bolt, and this spring is provided at about the middle of its
length with a lug or tooth, which engages with a series of notches or recesses
made in the upper side of the bolt. Each of these notches corresponds to the
space between two of the teeth of the aforesaid rack in the underside of the bolt.
This spring serves to retain the bolt temporarily in any position governed by
said recesses in which it is placed.
1. '
On the frame or jamb of the window or door is fitted a metal plate, on to
which is pivotally secured by means of a pin P, a small fork o, to which is
hinged one end of a slotted bar D, which may thus oscillate on the fork o and
rotate on the pin P.
4
When the actuating key or thumb-bit of the bolt is turned one quarter of a
revolution the said bolt enters the slotted bar and the door can then be set ajar
by the bolt sliding in the groove or slot of said bar. The end of the slot in same
will prevent the door from opening any further.
If instead of being turned one quarter of a revolution, the actuating key or
thumb-bit is turned one half of a revolution, the bolt will engage with an eye
or staple fixed on the aforesaid plate and thus the secure closing of the door is
obtained.
I will now describe my invention with reference to the accompanying draw-
ings in which one form of the invention is shewn, the same letters representing
the corresponding parts in the different figures.
Fig. 1 shews the interior of the box or casing containing the mechanism.
Fig. 2 shews the outside of the box, or casing, the lock or bolt C being at rest.
Fig. 3, shews a similar view with the bolt engaged in the slide D for holding
the door partly open.
Fig. 4, shews the apparatus on a partly open door.
Fig. 5, is a view of the outside of the casing mentioned above, the bolt being
pushed out to its full length for closing the door.
C is a rod forming the bolt placed in a box or casing H; K K is a plate
attached to the door, to which plate, the box or casing H is fixed; B is a toothed
pinion operated by a key A; the teeth of this pinion engage with teeth formed
in the underside of the bolt C. The latter is guided by a small pin C fixed to
the box or casing and this pin C¹ engages a slot C2 formed in the bolt C; F is
a spring furnished with a small tooth F which engages with the recesses formed
in the upper side of the bolt C, and keeps it in the position in which it is placed.
On the jamb of the door or window, a "receiving" plate L is fixed. On this
plate a slide D is pivotally attached capable of an angular movement in relation
to the same, and a fixed catch or staple E.
Fig. 2 represents the lock in the position of rest, if a quarter turn be made
to the right, the bolt enters the slide 1) as represented in Fig. 3, and the door
may be kept partly open as shewn in Fig. 4 without its being possible to open

page_text: it from the outside. Finally, if the key A be turned to the extent of a half turn
as shewn in Fig. 5, the bolt will enter the catch or staple E so as to lock the
door.
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 claim is:
(1) In a safety catch bolt or fastening, the combination of a box or casing H
attached to a plate K (attached to the door or window) said casing containing
a bolt C provided on its underside with a rack or teeth to engage with a pinion B,
capable of being rotated by a fixed key A, and said bolt C being provided on its
upper side with recesses which engage with a lug or tooth F mounted on a
spring F which holds said bolt in either one of the positions corresponding
with said recesses, substantially as described and set forth.
(2) In a safety catch bolt or fastening as claimed in Claim 1 the combination
of a receiving plate L to which are attached the hinged slide or slotted bar ])
and the catch or staple E, as herein described and set forth.
(3) In a safety catch bolt or fastening the combination of the box or casing H
and its component parts to be fixed to the door or sash or to the frame or jamb
thereof, with the catch or staple E and the slide 1) attached to the plate L,
as herein described and set forth.
(4) The safety catch bolt or fastening allowing the door or window to be
partially opened or entirely closed while still remaining secured, substantially
as shewn and described.
S. S. BROMHEAD,
Agent for Applicant, 171, Queen Victoria Street.