improvements in Lift Up Rim Locks and Latches for Doors.
Year: 1895

page_text: improvements in Lift Up Rim Locks and Latches for Doors.
I, ANDREW CASHIN, of Shakespeare Works, Willenhall, in the County of
Stafford, Lock Manufacturer, do hereby declare the nature of this invention to be
as follows:-
This invention has reference to what are known as "lift up" rim locks and
latches for doors and particularly to what are known as "four handed" rim locks.
One of my said improvements consists of the following improved construction and
arrangement of the lift up latch and follow through which latter the knobbed
spindle passes. According to this part of my said invention the lift up latch is
made in the form of a two armed lever arranged to turn on a fulcrum pin preferably
set back as far as possible from the rim. The longer of the said lever arms projects
through the rim and forms the latch proper. The other and shorter lever arm is
arranged at about right angles to the longer arm and extends far enough to be
acted upon by and is shaped to suit the double armed follow which latter is by
preference arranged on the centre line of the lock case so as the better to enable
the lock case to be reversed. A feather spring or other spring acts upon the
shorter lever arm so as to keep the latch down. In turning the follow in either
one or the other direction the shorter lever arm is moved forward and the longer
lever arm or latch proper is lifted.
In a modification of my invention I dispense with the shorter lever arm and
I arrange the follow and spring to act directly upon the longer lever arm or latch
proper but in this case the knob spindle does not pass through the centre of the
lock case.
This part of my said invention is applicable to lift up rim latches of all kinds as
well as to combined lift up rim latches and locks.
Another part of my said invention consists of the hereindescribed improved
means by which the lift up latch is locked by the act of turning the key to shoot
the bolt forward and is unlocked by the act of turning the key to withdraw the
bolt. In carrying out this part of my invention I make a part of the bolt which
is inside the lock case with a projection and I make the lift up latch with a corre-
sponding recess or notch so that when the bolt is shot forward by turning the key
the said projection on the bolt will engage with the notch in the back of the latch
and thus lock the latch and prevent the same being lifted by turning the knob
spindle. When the key is turned to withdraw the bolt the projection on the bolt
is also withdrawn from the notch in the back of the latch and the latter is free to
be lifted by the knob spindle. Instead of locking the lift up latch by a projection
on the bolt which engages with a notch in the back of the lift up latch as above
described 1 may make a projection on the back of the latch to engage with a notch
or recess in the bolt when the latter is shot forward as stated above.
Dated this 20th day of February 1895.
CHARLES BOSWORTH KETLEY
Agent for the Applicant..

page_text: part g' of the bolt G which is inside the lock case with a projection o² and I make
the lift up latch A¹ a' with a corresponding recess or notch h so that when the
bolt G is shot forward by turning the key the projection g² on the bolt will engage
with the notch in the back of the latch A' a' and thus lock the latch and prevent
same being lifted by turning the knob spindle. Figs. 1 and 3 shew the lock with
the bolt shot back in the case, but it will be understood when the bolt is moved
forward the projections 9³ will engage in the notch and prevent the latch being
lifted. When the key is turned to withdraw the bolt, the projection g² on the bolt
is also withdrawn from the notch in the back of the latch and the latch is free
to be lifted by turning the knob spindle.
Instead of locking the lift up latch by a projection on the bolt G which engages
with a notch in the back of the lift up latch as above described and shewn in
Figs. 1 and 3, I may as shewn in Fig. 4 make a projection on the back of the
lift up latch a¹ to engage with the notch g³ or recess in the bolt G when the bolt
is shot forward as stated above.
Fig. 3 shews the second part of my invention applied to a rim lock which has
the lift up latch A' a' constructed in the usual way, that is without the shorter
arm A² the follow D acting under this latch near its fulcrum pin B.
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 I
claim is :-
1. In a lift up rim lock and latch for doors, the improved construction com-
bination and arrangement of the lift up latch and follow to enable the follow
spindle to be located on the centre line of the lock case and to make the latch
move easily, that is to say, the combination of the two armed lever latch A' A' a¹,
the two armed follow D arranged on about the centre line of the latch case and
adapted to act upon the shorter arm A to lift the longer arm or latch proper, and
a spring to keep the said shorter arm in contact with the follow, all substantially as
herein before described and illustrated by Fig. 1 of the accompanying drawing.
2. In a lift up rim lock and latch for doors, so forming the lift up latch and the
bolt that when the bolt is shot forward the bolt will engage with the latch and
prevent the same from being lifted, and when the bolt is withdrawn the bolt will
release the latch and allow the same to rise, all substantially as herein before
described and illustrated by the accompanying drawing.
Dated this 20th day of November 1895.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.