Year: 1887

page_text: Date of Application, 8th June, 1887.
Complete Left, 21st July, 1887.
Complete Accepted, 23rd Aug., 1887.
I, HORATIO KELSON BROMHEAD of 245 St. Vincent Street, Glasgow, Scotland,
Architect, do.hereby declare the nature of this invention to be as follows:-
This invention relates more especially to locks such as mortice rim and other locks
having latch bolts, and has for its object to provide an effective substitute for the usual
spring which presses the latch forward.
.
In carrying out the invention a special form of latch bolt is used having a forked
inner end, the extremity of each arm of the fork being bent to a right angle so as to
form a lodge to engage with the corresponding arm of the follower.
The weighted lever is also peculiar, inasmuch as it is a weighted lever of considerable
power hung to a pivot near the face or front of the lock, and beneath the axis or pivot
on the short arm of the lever is a projecting corner or point, which bears firmly with
a horizontal pressure against the ledge or shoulder on the inner side of the front end
of the latch bolt. From the axis the long arm of the weighted lever extends
horizontally backwards over the latch bolt and the follower and terminates in the
weight a solid piece of metal behind the follower.
The effect of this arrangement is, that on the handle of the lock being turned in
either direction the follower immediately presses back the latch by acting on the hook
of the fork of the latch bolt and thereby also lifts the weighted lever. The peculiar
position of the balance weight gives to the pivotted lever adequate force and on the
handle of the lock being released the balance weight immediately presses the latch
forward to its extended position.
The novelty in the foregoing arrangement is the general form of the weighted lever
and the mode of applying its pressure by means of a point to the inside of the outer
end of the latch bolt. The shape of the latch bolt is also modified.
. S. S. BROMHEAD,
97, Newgate Street, E.C.,
Patent Agent.

page_text: I, HORATIO KELSON BROMHEAD, of 245 St. Vincent Street, Glasgow, Scotland,
Architect, 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 :-
This invention, which relates to improvements in locks having latch bolts, such as
the ordinary rim and mortice locks for doors, has for object, to provide an improved
method of dispensing with the use of springs, for acting upon and retaining the latch-
bolts, in their locked or extended position.
In carrying out the invention, a special form of latch bolt is used, having a forked
inner end, the extremity of each arm of the fork, being bent to a right angle, so as to
form a hook, to engage with the corresponding arm of the follower.
The weighted lever is also peculiar, inasmuch as it is possessed of considerable
leverage, being hung to a pivot near the face or front of the lock; and beneath the
axis, or fulcrum, on the short arm of the lever, is a projecting corner, or point, which
bears firmly, with a horizontal pressure against the ledge, or shoulder, on the inner
side of the front end of the bolt. From the axis, the long arm of the weighted lever,
extends horizontally backwards, over the latch, and the follower, and terminates in,
the weight, a solid piece of metal, behind the follower.
The effect of this arrangement is, that on the handle of the lock being turned in
either direction, the follower immediately presses back the latch, by acting on the hook
of the fork of the latch bolt, and thereby also lifts the weighted lover.
The peculiar position of the balance weight, gives to the pivotted lever, adequate
force; and on the handle of the lock being released, the balance weight immediately
presses the latch forward, to its extended position.
In the accompanying drawings,
Fig. 1. is a plan view of a mortice lock with the cover removed.
Fig. 2. is a side view of the weighted lever detached from the lock.
Fig. 3. shows a plan view of the same.
4.
5.
"
27
"1
"
6.
23
"
7.
23
23
an end view of the same.
a side view of the latch bolt.
a plan view of the follower.
a plan view of same taken edgeways.
A. is the lock case.
A¹
B.
B¹
47330
"
"
RR:
"
"
44
axis or fulcrum of the weighted lever.
latch bolt.
outer or acting end of the latch bolt.
hook at end of tail of latch bolt.
weighted lever.
horizontal point for delivering the pressure of the weighted lever.

page_text: 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 improved form, and position of the weighted lever; as herein explained and
set forth.
2. The mode of applying the pressure of the weighted lever; as herein explained
and set forth.
3. The special form, and action, of the latch bolt, and follower; as herein described
and set forth.
1
4. The general arrangement, and combination, of parts constituting the latch bolt,
the weighted lever, and the follower; as herein explained and set forth.
Dated thin 01.1 .
T 1
1000