Improvements in Mortice Locks.
Year: 1899

page_text: Date of Application, 5th July, 1899
Complete Snonification Lott 4th Ann 1000 100ented 30th Lane
1000
Improvements in Mortice Locks.
I, THOMAS LETHEREN, of 7, Bevan Villas, Lower Richmond Road, Putney, in
the County of Surrey, Builder, do hereby declare the nature of this invention
to be as follows:-
:..
These improvements relate to mortice, locks fitted both with a latch bolt and
a locking bolt.
The object of this invention is mainly to reduce to a minimum the extent to
which a door is weakened by the insertion into it of a mortice lock and this is
effected by so constructing the lock as 'to reduce the size of the lock case and
more especially the rear portion of this case so as to reduce the amount that a
door has to be cut away to receive the lock.
The rear portion of the lock case by which the follower through which the
door knob spindle passes is carried, is made of much less depth than the forward
portion of the case which contains the locking and latching bolts.
The locking bolt is placed as usual at the top of the case and the latching bolt
at the bottom. In the tail of the locking bolt somewhat in rear of the bolt head
is a slot through which passes a pin fixed to the lock case. The pin serves as a
guide for the bolt and also as a fulcrum for a leyer of thin sheet metal which
extends, downwards to the lower part of the case and is there pivotted to the tail
of the latching bolt and then extends backwards and upwards to the point where
the shallow portion of the case extends rearwards from the main body of the
case. At its end it carries a pin- which passes through a slot in the end of a
lever arm which at its other end is jointed by a rule or knuckle joint to the
follower.
•
When the follower is turned in a direction to raise the forward end of the
lever arm the arm turns with it just as though the follower and arm were
rigidly fixed together and the lever, arm lifts the tail end of the sheet metal
lever and by turning this sheet metal lever upon its fulcrum draws back the
latching bolt.
If the follower be turned in the opposite direction the rear end of the follower's
lever arm is moved downwards and brought against a stop fixed within the case
at a short distance further away from the follower than the pin of the rule or
knuckle joint-tris joint therefore opens and the front end of the arm is raised-
the stop forming a fulcrum for the arm to turn on. Consequently the latch bolt
is withdrawn just as if the follower were turned in the opposite direction.
The tumbler or sheet metal lever by which the lock bolt is locked is mounted on
a fulcrum pin at the rear end of the larger part of the lock case and form it
with a descending tail end which extends forwards to come somewhat in rear
of the rear end of the tail of the latching bolt.
.
The two ends of a bent spring come between them so that as is usual the one
spring serves both for the tumbler and the latcli bolt the spring is however.
situated in front of in place of in rear of the key as in locks heretofore made.
Dated this 4th day of July 1899.

page_text: марготощенов ш могысe LOCKB.
I, THOMAS LETHEREN, of 7, Bevan Villas, Lower Richmond Road, Putney, in
the County of Surrey, Locksmith, 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:―
"
These improvements relate to mortice locks fitted both with a latch bolt and
a locking bolt.
The object of this invention is mainly to provide a mortice lock which allows
of the extent to which a door is weakened by the insertion into it of the lock
being reduced to a minimum whilst at the sanie time providing efficient means
for effecting the withdrawal of the latching bolt by the turning of the follower
whether the follower be turned in one direction or the other.-
The rear portion of the lock case by which the follower through which the
door knob spindle passes is carried, is made of much less depth that the forward
portion of the case which contains the locking and latching bolts.
The locking bolt is placed as usual at the top of the case and the latching bolt
at the bottom. A lever extends downwards to the lower part of the case and is
there pivotted to the tail of the latching bolt and also extends backwards to
the point where the shallow portion of the case extends rearwards from the main
body of the case. At its end it is acted o
1-on by the end of a lever arm which at
its other end is jointed by a rule or knuckle joint to the follower.
When the follower is turned in a direction to raise the forward end of the
lever arm the arm turns with it just as though the follower and arm were
rigidly fixed together and the lever arm lifts the tail end of the lever and by
turning this lever upon its fulcrum draws back the latching bolt.
If the follower be turned in the opposite direction the rear end of the follower's
lever arm is moved downwards and brought against a stop fixed within the case
at a short distance further away from the follower than the pin of the rule or
knuckle joint this joint therefore opens and the front end of the arm is raised-
the stop forming a fulcrum for the arm to turn on. Consequently the latch bolt
is withdrawn just as if the follower were turned in the opposite direction..
In the drawing annexed A is the lock case having its rear end of much less
depth than the forward portion of the case which contains the locking and
latching bolts. B is the latching bolt pivotted at its rear end to a descending
lover arm C. C' is a horizontal arm of this lever extending backwards to the
point where the shallow portion of the case extends rearwards from the main
body of the case. D is the follower and E a lever arm jointed to it by a rule or
Knuckle joint E. G is a stop against which the lever arm E is held midway of
its length when the latch bolt is allowed to be pressed forward by the action of
the spring H. If the follower be turned to the right the lever arm E turns with
it as though both were rigidly affixed together and the end of the lever arm
acting against the underside of the lever arm C' turns this lever and withdraws.
the latch bolt.
".
If the follower be turned to the left the joint F yields and the lever arm E
rocks upon the stop G as a fulcrum and so withdraws the bolt.
I is a locking bolt and J a tumbler acting therewith it being pressed down-
wards by the action of the spring H these may be of any ordinary construction.
"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. The combination of the lock case formed at its rear end of less denth than 5

page_text: the front, the follower carried at the end of the smaller portion of the case, the
lever arm jointed by a rule or knuckle joint to the follower, a stop for the under-
side of the arm to come against midway of its length, a lever for the forward.
end of the arm to act against and a latch bolt drawn back by a descending arm
of this lever whether the follower be turned in one direction or the other.
2. For withdrawing the latch bolt of a lock the combination of a follower, an
arm jointed to it by a rule or knuckle joint which causes the arm to turn with
the follower when the follower is turned in one direction and a stop for the
arm to come against midway of its length when the follower is turned in the
opposite direction so that the joint then yielding the arm rocks upon the stop
as a fulcrum and consequently the extremity of the arm always moves in the
same direction in whichever way the follower is turned and by interposed mech-
anism withdraws the bolt.
3. The construction of mortice locks substantially as hereinbefore described and
illustrated in the drawing annexed.
Dated thi 0741.
1-
L 1
1000