IMPROVEMENTS IN OR RELATING TO DOOR CHAINS AND LOCKS
Year: 1886

page_text: Date of Application, 2nd July, 1886.
Complete Left, 4th Apr., 1887.
Complete Accepted, 6th May, 1887.
1, WILLIAM HENRY BARACLOUGH of Whitehall Chambers Colmore Row Birmingham
in the County of Warwick Mechanical Engineer do hereby declare the nature of this
invention to be as follows for IMPROVEMENTS IN OR RELATING TO DOOR CHAINS
AND LOCKS:-
My Invention consists in combining door chains with door locks whereby a separate
door chain is dispensed with, as hereinafter described, I will describe my Invention
as applied to rim locks but it may also be applied to other kinds of locks. I construct
and modify certain parts of the said door lock and the door chain to be used with
then in the following manner.
The bolt of the lock has near its outer edge or end a hook like recess or cavity, I
attach the end of the door chain to the door frame by means of a staple, or it may
be connected to the staple box. The free end of the chain has a hook connected,
corresponding in form and shape to the cavity or recess in the end of the bolt of the
lock. When the chain is required to be connected to the lock for fastening the door
in a partly open position the bolt of the lock is shot from out of its case by
the key, and the hooked end of the door chain is then placed in the cavity of the bolt
and made to lie flush with the upper edge of the said bolt, the shank of the hooked end
of the chain passing out of the open end of the face of the bolt. Or I may modify
this part of my said invention by having a knob placed at the end of the shank or link
of the chain which corresponds to the cavity in the bolt of the lock.
The parts having been thus arranged the withdrawing of the bolt into the lock case
by the key carries the hooked end or knobed shank, of the chain with the bolt into
the said lock case.
The connected end of the chain cannot be disconnected from the lock until the bolt
has been shot from out of its case by the key.
The lock may be used as an ordinary lock with the hooked end of the chain taken
out of the cavity of the bolt.
The hooked end may be placed in a slot in the face of the lock when the bolt has
entered the staple box which will form an additional safety fastening to the door.

page_text: My improvement consists further in forming a hook upon the end of the bolt of
the lock and useing a loop or link instead of a hook or knob end of the chain, the said
link is placed upon the hooked end of the bolt and is drawn into the lock case in the
manner described.
In combining door chains and locks according to my invention, I produce a safety
door chain and lock which is especially useful for Wards of Prisons and Lunatic
Asylums where a ventilation is required.
The door may be left a short distance open in safety.
It is also useful for vestibule and bedroom doors, but it may also be applied to any
other kind of door locks.
1 TR
1
25 T
1000

page_text: Improvements in or relating to Door Chains and Locks.
I, WILLIAM HENRY BARACLOUGH of Whitehall Chambers Colmore Row Birmingham
in the County of Warwick, Mechanical Engineer, 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 :-
To obtain in a door chain, perfect security, I connect its free end, which usually
engages within the long slot of a frame, secured on the back of a door, to a lock bolt
in such a manner, that on the bolt being shot within its case, the terminal end of the
chain is carried with it and locked within the inside of the case, and can only be
disconnected, by again unlocking the bolt by a key in the usual manner-This mode
of connection and fastening, affords additional security against entrance; and more-
over, a door is allowed to be open for ventilation, without fear of an entrance being
made by the disengagement of the chain from the door, by a wire clandestinely
applied.
My door chain admits of being connected to a door, either from the inside or from
the outside, which is a very great advantage, when a person requires to leave a door
upon a chain, on leaving a house or an apartment, which is unattainable in door chains
of the ordinary kind.
I will describe my invention in connection with an ordinary rim lock, although my
invention is applicable to all locks and latches with shooting bolts.
The fixed end of the chain is secured to the staple plate, or the staple box of a lock,
while the top side of the end of the bolt of the lock is provided with a sunken cavity
or depression, wherein a hook or a hooked ended part carried at the free end of a
chain is dropped and secured, when the bolt is shot into its case; that is, the cavity
within the top side of the end of the bolt, is of the counterpart of the end of the chain;
and when the bolt is out of its case, the said end is capable of being placed in
the said depression, and is securely locked therein, by the shooting of the bolt
inwardly.
The front face of the lock casing, has a gapped hole, wherein the end of the chain
drops, so as to afford additional security for the door, when the door is locked.
Figure 1 shows in front elevation a combined lock and door chain constructed
according to my invention-The bolt of the lock is shown thrown out of its case,
and with the hooked terminal end of the chain connected with the end of the bolt ;
that is, the hooked end of the chain is dropped into the recess in the bolt, and with
the top portion of the said hook part, lying flush, or a little below the top edge-
Figure 2 represents the same with the bolt and terminal end of the chain shot into the
lock case, thereby locking the said chain to the door, which can only be disengaged or
unfastened by the shooting outwardly again of the bolt-Figure 3 represents the door
carrying the lock, closed, and with the hooked end of the door chain secured within
a slot or gap in the face of the lock case-Figure 4 shows the door open, and with the
bolt of the lock protruding out of the case, ready for the dropping therein of the

page_text: hooked end of the chain, and which said hooked end is shown hung upon a hook,
carried by the staple box-Figure 5 shows the lock bolt and end of chain in elevation
Figure 6 shows the bolt in section, and the hooked end of chain removed-Figure 7
is a plan of the top of the bolt, while figures 8 and 9 is a plan and section of a modi-
fication of the recess in the end of the bolt; and figures 10 and 11 are modifications
of the hooked ends of the chain to be used therewith-Figure 12 is another modi-
fication, and figure 13 is a, section of the same-
e-Figures 14 and 15 are modifications
of the terminal end of the chain to be used with the bolt figures 12 and 13-The end
figure 14 is provided with a swivelling link-Figures 15 and 15 represent another
modification of the chain connection with the bolt-Figures 16 and 17 is another
modification in which the recess in the end of the bolt, is made T form, wherein a
corresponding T on the end of the chain passes-Figures 18 and 19 show another
form of connection which is made upon the side instead of on the top-Figure 20
shows another form in which the connection is made upon the side, but of a hook
form Figure 21 is a side view of figure 20-Figure 22 is a side elevation, figure 23
is a plan, and figure 24 is an end view of another modification, in which the end of
the chain is made in the form of a link, which passes as it were, over a stump or
block Figure 25 shows the same form, but with the gap at the back of the lump,
inclined.
The same letters of reference indicate corresponding parts in the several figures of
the drawings.
a is a door lock or latch case, b is a locking bolt, and c is a hook shaped recess,
sunken cavity, or hole made therein, within or therethrough, and wherein or there-
through, the terminal hooked end, or the terminal end 2 of a door chain & engages,
which on the bolt 6 or its equivalent being thrown or passed into its case, or the lock
case, becomes locked thereine is the staple box or staple plate, and f is a hook,
secured thereto, or to a door frame g, to which the fixed end d³ of the door chain d is
connected.
The gap or opening in the lock case, wherein the terminal end of the chain engages,
when the door is closed, is marked i.
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-
First A locked door chain, or a combined door chain and lock, or lock bolt, or
their equivalents; that is to say, connecting and fastening or locking a door chain,
or the end of a door chain, to a lock bolt, or to a lock case, substantially as described
and set forth.
Secondly Making the connection of the ends of door chains, with lock bolts, by
the end of the one, engaging with, or lying within a recess in the other, substantially
as described and illustrated in the several figures of the drawings.
Dated this 29th day of March 1887.