Improvements in Latch Mechanism of Door and other Locks.
Year: 1892

page_text: Date of Application, 12th Aug., 1892
Complete Specification Left, 12th Apr., 1893—Accepted, 10th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Latch Mechanism of Door and other Locks.
I WILLIAM KNEEN 149 Aldersgate Street London, E.C. Mechanical Engineer
do hereby declare the nature of this invention to be as follows:-
A means for reducing friction on the latchbolt of ordinary door or other locks.
To accomplish this end I fix or suspend, instead of the whole of the ordinary
latchbolt in a horizontal position, a portion of the latchbolt to a pin, or pivot, and
attach the lever operating the same from the door furniture to the suspended
portion higher up than the position it would occupy in the ordinary latchbolt, thus
causing the suspended portion to act as a lever to reduce the friction on the latch-
bolt when pressed into the lock case as a portion of such pressure is thrown on the
pivot and a portion on the latchbolt in the usual manner.
Dated this 6th day of August 1892.
WILLIAM KNEEN.
COMPLETE SPECIFICATION.
Improvements in Latch Mechanism of Door and other Locks.
I, WILLIAM KNEEN of 149 Aldersgate Street in the City of London Mechanical
Engineer do hereby declare the nature of this invention and what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement :—
My invention has for its object to provide means whereby the friction on the
latch-bolt of door or other locks is reduced and the said latch bolt is thereby caused
to act in a better manner than is the case with such latch bolts as hitherto arranged.
To accomplish this object according to my invention instead of the whole of the
latch-bolt being in a horizontal position or in one piece as hitherto 1 secure or
suspend a portion (a in the accompanying drawings) of the latch-bolt to a pin or
pivot (in the accompanying drawings) and I attach the lever or bar (c in the
accompanying drawings) operating the same from the door furniture, to the
suspended portion higher up (at d in the accompanying drawings) than the position
which it occupies in an ordinary latch-bolt thus causing the suspended portion to
act as a lever to reduce the friction on the latch-bolt when pressed into the case
as a portion of such pressure is thrown on the pivot and a portion on the latch bolt.
The accompanying drawings shew two arrangements according to my invention
Figures 1 and 2 shewing the shot and withdrawn positions respectively of an
arrangement in which the connection of the latch-bolt proper (A) with the part a
is made by a pin a' and the part a is centred on the pin & the bar c being connected
at d to the part a and at e to the lever centred at f and acted upon by the horns g
from the boss g through which the operating spindle passes. In Figures 3 and 4
(which also shew respectively the shot and withdrawn positions) the part a is made
in one with the latch bolt A proper which is very short and the bar c is corre-
spondingly lengthened to be connected by the pin d to the projection from the
part a.
.
I have shewn separate locking bolt and mechanism also in the drawings but I do
not claim this as if such separate bolt and mechanism be used it may be of any
suitable description.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
The connection of a latch bolt with the part which is operated from the door
furniture by means of a portion constituting a lever to which the latch bolt proper
and the part operated from the door furniture are respectively connected substantially
as hereinbefore described and illustrated by the examples shewn in the accom-
panying drawings.
Dated this 19th day of Anril 1893
J. H. JOHNSON & Co.,
Agents.