Improvements in Door Looks.
Year: 1893

page_text: Date of Application, 13th Dec., 1893
Complete Specification Left, 12th Sept., 1894-Accepted, 13th Dec., 1894
Improvements in Door Looks.
I, PAUL LOISEAU-ARCIER, of 21 Boulevard Poissonnière, Paris, in the
Republic of France, do hereby declare the nature of this invention to be as
follows:-
My invention relates to a door lock which is designed to be inserted or sunk
into the wood of the door and comprises a barrel or head designed to receive
the spring bolt actuating the movable bolt adapted to be stopped at will, and a kind
of box containing the movable bolt which is constantly under the action of a
spring.
When the lock has also a dormant bolt the box containing the latter is flat and
of triangular form, the connection between the barrel or head and the movable
bolt being obtained by means of a rod secured to the movable bolt which is suitably
guided and connected to the barrel by the aid of a spring hook.
This lock does not affect the strength of the door into which it is sunk. It is
constructed so as to necessitate the least possible cutting and without any alteration
in the joining of the wood-work; its barrel may be placed in the middle of the
width of the doors and serve for their decoration by the more or less rich
ornamentation of its plates or outer discs.
In one arrangement the improved lock comprises a movable bolt and a forked
dormant bolt, both being enclosed in a box or case of flat and triangular form
closed by a cover plate. The box carries at its base a plate traversed by the two
bolts and pierced with holes for the fastening screws, and at its top opposite to the
base a socket serving for the passage of the tail-piece of the movable bolt. This
movable bolt is constantly under the action of a spiral spring.
The dormant bolt possesses toes for the action of the bit of the key which may
be slid from the inside or from the outside upon the pins and into notches in order
to engage with recessed parts adapted to turn upon a pirot and submitted to
the action of springs. These recessed parts may be arranged in any suitable
manner.
The movable bolt aids in providing for the security by means of a part forming
a knife edge which the bit must avoid and which is interposed between the recessed -
parts and the toes of the dormant bolt.
The tail-piece of the movable bolt is connected by a sleeve to a rod the extremity
of which, being appropriately split, constitutes a spring nose for joining the movable
bolt with its operating mechanism.
This operating mechanism comprises a slide with a socket engaging with the
said nose and lateral heel-pieces and a driver upon which the said slide moves and
which has two branches acting upon the heel-pieces. This driver allows the
passage of the square rod of a spring bolt and turns upon two suitably connected
plates.
The before-mentioned slide, driver and plates constitute the barrel or head of the
lock which may be sunk into the middle cross piece of doors provided with a
cavity of suitable shape. It is fixed by means of a disc screwed into an annular
projection on one of the two plates and the shoulder of which retains a counter
plate. This barrel or mechanism for operating the movable bolt is firmly
mounted upon the door by the aid of the said disc without any separate screw or
the like.
I may make the outer plates of round, square, oval, polygonal or other
appropriate shape and decorate them in any desired manner.

page_text: The before-mentioned box enclosing the movable and dormant bolts is inserted
into the wood-work of the door and retained by two screws at the end. The
cavities of the box and of the barrel are connected by a cylindrical hole for the
passage of the rod hereinbefore referred to.
In a modified arrangement of my improved lock the dormant bolt is dispensed
with. The box is reduced to a plate allowing the passage of the movable bolt and
to a bridge piece with a socket serving as a guide for the tail-piece of the said
movable bolt. The tail-piece provided with the spring nose for enabling it to be
hooked to the slide of the operating mechanism is covered by a tube protecting a
helical spring constantly tending to force the movable bolt to the closed position.
The tube may be screwed upon the aforesaid socket or fixed in any other desired
manner and the helical spring bears on the one hand against the bottom of the
tube and on the other hand against a pin traversing the tail-piece of the movable
bolt.
I may lock the operating mechanism, that is to say stop the movable bolt in the
closed position by means of a turn-button acting upon the said slide, or by means
of a small lock, the bolt of which, being rendered movable by a special key, acts
upon a thumb-piece which butts against the slide or liberates it.
It will be understood that the forms, dimensions and materials employed in the
construction of the improved lock may be varied without departing from the scope
of my invention.
Dad thin 19th nearinho 1902
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
+
Improvements in Door Locks.
1, PAUL LOISEAU-ARCIER, of 21 Boulevard Poissonnière, Paris, in the
Republic of France, 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 :-
My invention relates to a door lock which is designed to be inserted or sunk into
the wood of the door, and comprises a barrel or head designed to receive the
handle shaft or spindle actuating the latch bolt adapted to be stopped at will, and a
kind of box containing the latch bolt which is constantly under the action of a
spring. When the lock has also a locking bolt the box containing the latter is
flat and of triangular form. The connection between the barrel or head and the
latch bolt is obtained by means of a rod secured to the said bolt which is suitably
guided and connected to the barrel by means of a spring hook.
This lock does not affect the strength of the door into which it is sunk. It is
constructed so as to necessitate the least possible cutting away of the wood and
without any alteration in the joining of the wood work; its barrel may be placed
in the middle of the width of the doors and may serve for decorating the same by
the more or less ornamented outer plates or discs.
In the accompanying drawing,
Figure 1 is an horizontal section of my improved lock sunk into the thickness of
a door, and comprising a movable or latch bolt and a locking bolt, constituting a
so-called safety lock.
Figure 2 is a vertical section partly in elevation of this lock.
Figure 3 shows a front view of a half-turn locking bolt sunk lock.
Figure 4 is a section of the same on the line 1-2 of Figure 3 and
Figure 5 shows a front view of a modification of this lock without a locking
bolt, but in which the latch bolt may be held or secured in the locked position. In

page_text: this modification the box of the lock is reduced to its simplest form and the
connecting rod between the barrel and the latch bolt is surrounded by a tube which
protects the spring for the back movement.
The so-called safety lock represented in Figures 1 and 2 comprises a latch
bolt A and a forked locking bolt B, both being enclosed in a box or case C of flat
and triangular form closed by a cover plate c. The box C carries at its end a
plate traversed by the two bolts and provided with holes for the fastening
screws 1, 2, and at its end opposite to the base with a socket a serving for the
passage of the tail-piece t of the latch bolt A. This bolt is constantly under the
action of a spiral spring surrounding the tail-piece t and placed and supported in
the socket a.
The locking bolt B guided at fis provided with projections e with which engages
the bit of the key which may be slid from the inside or from the outside upon the
pins gg¹ respectively fixed to the cover plate c and to the box C. It also comprises
a return tail-piece B' wherein are formed notches in order to engage with
projections on the recessed parts or tumblers i adapted to turn upon a pivot
and submitted each to the action of springs.
The arrangement of these recessed parts or tumblers may be of any suitable
construction, but it should be observed that these tumblers allow of the return
tail-piece of the locking bolt being actuated by the key.
The latch bolt A assists in providing for the security by means of a part forming
a knife edge which the bit must avoid and which is interposed between the recessed
parts and the projections of the locking bolt B.
The tail-piece t of the latch bolt A is connected by a sleeve k to a rod T of
suitable length and the extremity of which, being appropriately split, constitutes a
spring nose m for joining the latch bolt with its operating mechanism.
This operating mechanism comprises a slide D with a socket n engaging with the
said nose m, and lateral heel-pieces o o¹ and a driver E upon which the said
slide D moves and which has two branches p p acting upon the heel-pieces o o¹.
This driver allows the passage of the square rod or spindle of a spring handle and
turns upon two suitably connected plates P and P¹.
The before-mentioned slide, driver and plates constitute the barrel and head of
the lock which may be sunk into the middle cross piece of a door provided with a
cavity of suitable shape. It is fixed by means of a rose v screwed into the
socket u on the plate P¹ and the shoulder of which retains a counter plate Q. As
shown this barrel or mechanism for operating the latch bolt is firmly mounted upon
the door by the aid of the disc v without other screws or the like.
I may make the outer plates P and Q of round, square, oval, polygonal or other
appropriate shape and decorate them in any desired manner.
The box C enclosing the latch bolt A and locking bolt B is inserted into the
wood work of the door and retained by two screws at the end.
The cavities of lock proper and of the barrel are connected by a cylindrical hole
for the passage of the rod T.
The lock represented in Figures 3 and 4 has a half-turn locking bolt B'. In this
lock the box C is narrower, and the locking bolt B2 engages with a projection **
on the recessed part or tumbler subjected to the action of a spiral spring
bearing upon the box C. The fork of the bolt B' exactly fits the latch bolt A
which is connected to the driver in the manner hereinbefore set forth with regard
to the safety lock. All the other parts of this lock are such as described with
reference to the safety lock.
The lock represented in Figure 5 has only a latch bolt A. Its box is reduced
to a simple plate allowing the passage of the latch bolt A and to a bridge
piece a with a socket serving as a guide for the tail-piece of the said movable bolt.
The tail-piece T provided with the spring nose m for enabling it to be hooked
to the slide D of the operating mechanism is covered by a tube g protecting
a helical spring r constantly tending to force the latch bolt A to the closed
position. The tube a may be formed on or fixed to the aforesaid socket a¹ in any

page_text: -other desired manner, and the spring bears on the one hand against the bottom.
of the tube and on the other hand against a shoulder of the tail-piece of the latch
bolt.
I may lock the mechanism, that is to say stop the latch bolt in the closed
position, by means of a turn-button acting upon the said slide D, or by means of
a small lock R, the bolts of which, being rendered movable by a key, butts against
the slide D to lock the bolt and is withdrawn to liberate it.
The form of the barrel represented in Figure 5 is rectangular. The sleeve k
and the rod T having a hook m are similar to those described with reference to
Figures 1 and 2.
It will be understood that the forms, dimensions and materials employed in the
construction of the improved lock may be varied without departing from the scope
of my invention.
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 :-
First. A lock designed to be let into the thickness of the door and characterized
by the arrangement of a latch bolt and a locking bolt in the interior of a flat box
of triangular form and at the end of which, provided with a socket, passes the tail-
piece of the latch bolt connected by a spring hook nose to an operating mechanism
more or less removed and in which is a slide and a driver, the latter being traversed
by the shaft or spindle of a spring handle, the box enclosing the bolts and the
plates containing the slide and driver located in the thickness of the doors,
without affecting the strength of the joined parts substantially as hereinbefore
set forth.
Second. A lock designed to be let into the thickness of doors and characterized
by the arrangement of a latch bolt whose tail-piece is connected by a spring hook
nose to an operating mechanism more or less removed, and in which is a slide and
a driver, this latter being traversed by the shaft or spindle of a spring handle, the
said mechanism being adapted to be locked by means of a turn button or an
additional small lock acting upon the slide, substantially as hereinbefore
-specified..
Third. In the above described lock the special arrangement of the box or case
containing the latch and locking bolts and more particularly its flat and triangular
form which permits it to be sunk into the thickness of the door without affecting
the strength of the joined parts, substantially as hereinbefore set forth.
Fourth. In the lock herein before described the special arrangement of the
mechanism for operating the latch bolt and whose constitutive elements (slide and
driver) are retained by three plates, the intermediate one having formed thereon a
socket into which is screwed a rose serving to fix the said mechanism without the
use of screws or fastenings, substantially as herein before set forth.
Fifth. The so-called safety lock such as herein before described and represented
in Figures 1 and 2 of the drawing.
Sixth. The half-turn bolt lock such as hereinbefore described and represented in
Figures 3 and 4 of the drawing.
Seventh. The lock having a latch bolt, such as herein before described and
represented in Figure 5 of the drawing.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.