Improvements in Locks having Latch-bolts.
Year: 1892

page_text: Date of Application, 11th Mar., 1892
Complete Specification Left, 2nd Dec., 1892-Accepted, 25th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Locks having Latch-bolts.
I, HORATIO KELSON BROMHEAD, of 243 St. Vincent Street, Glasgow,
Scotland, Architect, do hereby declare the nature of this invention to be as
follows:-
This invention, which relates to improvements in locks such as mortice rim or
other locks having latch-bolts, has for its object the providing of an improved
substitute for the usual spring which retains or returns the latch into its locked or
extended position.
In carrying out the invention a special form of latch-bolt is used which is
reversible, and has the ordinary sloped or outer end projecting outside and beyond
the lock, and has a special plain inner shaft with two holes to engage the corre-
sponding raised pins on the two cranks that work the latch bolt. The one hole
engages the one pin of C2 and keeps the latch-bolt in its horizontal position and
also works tlie latch bolt to and fro, and the other hole is a short slot which allows
the other pin of C₁ to work a little up and down while the pin works the latch
bolt to and fro. The outer end of the latch-bolt has two shoulders one on each side
and just within the lock for the purpose of receiving and being acted upon by the
horizontal pressure of the weighted lever W.
:
The two cranks C¹ and C are also peculiar to my invention. They each have a
raised pin. These two raised pins engage the two holes of the latch-bolt and
alternately work the latch-bolt or are simultaneously worked by the latch-bolt.
The follower has a bent single arm which alternately engages one or other of
the cranks and thereby works the latch-bolt.
The weighted lever W is hung on a pivot P near the face plate or front of the
lock, and is furnished with a corner W beneath the axis or pivot. This corner
bears firmly with a horizontal pressure against one or other of the two shoulders of
the latch-bolt, the horizontal pressure being obtained by means of a weight attached
to the inner end of a long arm which extends from the corner in a horizontal
direction inwards under and beyond the follower.
The effect of this arrangement is that the handle of the lock on being turned in
either direction turns the arm of the follower which acts upon and moves one or
other of the cranks which thereby moves back the latch-bolt and thereby raises
the weighted end of the lever. On the handle of the lock being released the
weighted end of the lever descends and thereby presses the corner horizontally
against the, shoulder of the latch bolt and forces the latch bolt out and so returns
it to its locked or projecting position.
The novelty of the invention is;-
1. The general form of the weighted lever .W and its method of applying its
horizontal power to one or other of the shoulders of the latch-bolt.
2. The two shoulders of the latch-bolt and the form of the plain inner shaft of
the latch-bolt, and the manner of engagement of the inner shaft of the latch-bolt
with the pins of the two cranks, and the peculiarity that the one pin engages in a
hole whereby the latch-bolt is both moved 'horizontally and its inner shaft held
vertically, while the other pin engages in a vertical slot and moves the latch-bolt
horizontally.but does not sustain it vertically:
3. The two cranks, and their form, and their manner of engagement with the
latch-bolt and the arm of the follower.
4. The form of the arm of the follower.and its manner of alternate action upon
the cranks

page_text: The accompanying drawing shews an elevation of a mortice lock with its side
plate or cover removed.
Above and below the elevation of the lock are also shewn plans of the five parts
of the lock which exhibit the novelty of the invention.
W is the weighted lever.
.
HORATIO K. BROMHEAD,
243, St. Vincent Street, Glasgow, Scotland.
COMPLETE SPECIFICATION.
Improvement in Locks having Latch-bolts.
I, HORATIO KELSON BROMHEAD, of 243 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:-
Note. The drawings referred to are those accompanying the Provisional Specifi-
cation.
This invention, which relates to improvements in locks, such as mortice rim and
other locks having latch-bolts, has for its object the providing of an improved
substitute for the usual spring which retains or returns the latch into its locked or
extended position.
In carrying out the invention a special form of latch-bolt is used which is
reversible and has the ordinary sloped or outer end projecting outside and beyond
the lock, and has a special plain inner shaft with two holes to engage the corre-
sponding raised pins on the two cranks that work the latch-bolt. The one hole engages
the one pin of C² and keeps the latch bolt in its horizontal position and also works
the latch bolt to and fro, and the other hole is a short slot which allows the other
pin of C to work a little up and down while the pin works the latch-bolt to and
fro. The outer end of the latch bolt has two shoulders one on each side and just
within the lock for the purpose of receiving and being acted upon by the horizontal
pressure of the weighted lever W.
The two cranks C¹ and C are also peculiar to my invention. They each have
a raised pin. These two raised pins engage the two holes of the latch-bolt and
alternately work the latch-bolt, or are simultaneously worked by the latch bolt.
The follower has a bent single arm which alternately engages one or other of
the cranks and thereby works the latch-bolt.
The weighted lever W is hung on a pivot P near the face-plate or front of the
lock, and is furnished with a corner W₁ beneath the axis or pivot. This corner
bears firmly with a horizontal pressure against one or other of the two shoulders
of the latch-bolt, the horizontal pressure being obtained by means of a weight
attached to the inner end of a long arm which extends from the corner in a
horizontal direction inwards beyond the follower. The effect of this arrangement
is that the handle of the lock on being turned in either direction turns the arm of
the follower which acts upon and moves one or other of the cranks which thereby
moves back the latch-bolt and thereby raises the weighted end of the lever. On
the handle of the lock being released the weighted end of the lever descends and
thereby presses the corner horizontally against the shoulder of the latch-bolt and
forces the latch bolt out and so returns it to its locked or projecting position.

page_text: The novelty of the invention is ;-
1. The general form of the weighted lever W and its method of applying its
horizontal power to one or other of the shoulders of the latch-bolt.
2. The two shoulders of the latch-bolt, and the form of the plain inner shaft of
the latch bolt, and the manner of engagement of the inner shaft of the latch-bolt
with the pins of the two cranks, and the peculiarity that the one pin engages in a
hole whereby the latch bolt is both moved horizontally and its inner shaft held
vertically, while the other pin engages in a vertical slot and moves the latch bolt
horizontally but does not sustain it vertically.
3. The two cranks, and their form, and their manner of engagement with the
latch-bolt and the arm of the follower.
4. The form of the arm of the follower and its manner of alternate action upon
the cranks.
The drawings shew an elevation of a mortice lock with its side plate or cover
removed. Above and below the elevation of the lock are also shewn plans of the
five parts of the lock which exhibit the novelty of the invention.
Wis the weighted lever.
Lis the latch-bolt.
C¹ and C are the cranks.
F is the follower.
W is the corner which applies the power of the weighted lover.
P is the pivot of the weighted lever
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what 1.
claim is ;-
1. The improved form and position of the weighted lever; as herein explained
and set forth.
2. The improved form and action of the latch-bolt; as herein explained and set
forth.
3. The improved form and position and action of the two cranks; as herein
explained and set forth.
4. The improved form of the follower and its action upon the cranks and latch-
bolt; as herein explained and set forth.
5. The general arrangement and combination of parts constituting the weighted
lever the latch bolt the two cranks and the follower; as herein explained and set
forth.
Dated this 1st day of December One thousand eight hundred and ninety-iwo.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what 1
claim is;-
1. The improved form and position of the weighted lever; as herein explained
and set forth.
2. The improved form and action of the latch-bolt; as herein explained and set
forth.
3. The improved form and position and action of the two cranks; as herein
explained and set forth.
4. The improved form of the follower and its action upon the cranks and latch-
bolt; as herein explained and set forth.
5. The general arrangement and combination of parts constituting the weighted
lever the latch bolt the two cranks and the follower as herein explained and set
forth.
Dated this 1st day of December One thousand eight hundred and ninety-iwo.
HORATIO K. BROMHEAD.