Improvements in the Mechanism of Lever, Rim, and other Door Locks.
Year: 1890

page_text: Date of Application 4th Mar., 1890-Accepted, 5th Apr., 1890
COMT DUTE DIVIFICATION.
Improvements in the Mechanism of Lever, Rim, and other Door
Locks.
I, JOSEPH LEGGE, of Stafford Street, Willenhall in the County of Stafford, Lock
Manufacturer, 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 :-
The object of my invention is to simplify the mechanism of lever rim and other
door locks, having both a "bolt" and a "shut." It is usual in such locks to work
the lever by means of a spring of its own, and to employ a separate spring to actuate
the "shut." According to my invention one spring only is employed to fulfil both
functions. I place this spring, which has two equal legs like the legs of a partially
open pair of compasses, vertically in a suitable position between the "bolt" and
"shut." The loop of the spring passes round a pin fixed to the lock case. It is to be
understood that the "bolt" and lever are in the top part of the lock, and that the
"shut" is in the bottom part. I furnish the lever with a suitable depending tail which
engages one of the legs of the spring, and I furnish the "shut" with a suitable upward
projection which engages the other leg of the spring. In this way the usual spring
on the lever, which is very apt to get out of order and which from its small width
is never too strong, is entirely dispensed with.
For the clearer explanation of my invention, I will describe it in reference to the
accompanying drawing, in which the various parts are indicated by letters of
reference.
The drawing illustrates a one lever rim lock having both a "bolt" and a "shut,"
with the back-plate removed. A is the bolt which is shewn in its unlocked position.
B is the lever furnished with the depending tail C. D is the "shut" furnished with
an upward projection E. F is the spring which is held in position by the pin G
attached to the lock case H. It will be obvious that when the key is inserted into
the lock, and the lever B is thereby moved, the depending tail C engages the right
hand leg of the spring F. On the other hand when the "shut" D is moved back-
wards or forwards the upward projection E thereon engages the left leg of the
spring. The one spring is thus made to answer the purpose of the two separate ones
usually employed, one of which in the lock illustrated would project from the upper
part of the lever B and act against the lock case in that direction, while the other
would be arranged to work between the tail of the "shut" and the lock case.
Having thus stated the nature of my said invention, and in what manner the
same is to be performed, I declare that what I claim is :-
1st. The single spring F acting both upon the lever B and on the "shut" D,
substantially as and for the purpose herein described and illustrated by the accompanying
drawing.
2nd. The tail Con the lever B, substantially as and for the purpose herein described
and illustrated by the accompanying drawing.
3rd. The projection E upon the "shut" D, substantially as and for the purpose
herein described and illustrated by the accompanying drawing.
4th. The general arrangement of single spring F, tail C, and projection E,
ubstantially as and for the purpose herein described and illustrated by the accompanying
drawing.
Dated this 3rd day of March 1890.
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