Year: 1886

page_text: THE
Figures 1 and 2 show side views of my improved latch.
Figure 1 shows the position of the bolt when engaged with the striking plate
and Figure 2 shows the position of the bolt when withdrawn from the striking
plate.
Figure 3 is a plan of the latch.
Figures 4 and 5 show respectively side views of the latch bolt, and a lifting lever
severally referred to hereafter.
Figure 6 shows a sectional view of a knob secured on the latch spindle by a
washer plate, and Figures 7 and 8 are separate views of the washer plate and
spindle.
Each latch consists of a flat plate of iron, brass, or other metal A which is let in
flush with the edge of the door B to which it is applied, the plate is secured to the
door by two screws in the usual way, the plate is perforated to admit of the free
passage of the catch bolt C of the latch, the bolt forms the lower end of a right
angled lever which rocks on an axle pin D secured in two tabs E which projèct
from the inner side of the plate A, the horizontal portion of the lever carries a
pin C¹ which takes into a hole in a lever F one end of which forms a boss perforated
with a square hole to receive a spindle F¹.
The wood or other material of which the door is made has a mortice hole G cut
or otherwise formed in it large enough to admit of the free action of the two
levers C and E. The spindle F is provided with a knob at each end one on each
side of the door, the slight turning of either knob causes the spindle to throw up
the lever F into the position shown at Figure 2, carrying the pin C' with it and
causing the catch C to be withdrawn from the striking plate to enable the door to
be opened, upon releasing the knob the weight of the two levers will cause the
catch bolt C to project from the edge of the door, ready to enter the striking plate
as the door is closed.

page_text: Instead of securing the knobs on the spindle in the usual way by means of a set
screw passed through the side of the knob, and having the end of the screw
entering one or other of the recesses in the spindle shown at Figure 8. I secure
each knob on its spindle by the following means: I provide each or either
knob with a metal washer plate H having a central square hole to correspond
to the section of the spindle F, from the circumference of the plate two or more
enlargements H project, these enlargements are turned up so as to clip the smaller
end of the knob, a plate is slipped on the knob with the hole in its centre to
correspond with the square hole in the knob, both are then placed upon the outer
projecting end of the square spindle F, which has a series of notches F* cut in each
corner as shown in the side view Figure 6, the knob and washer being in position
on the spindle, the knob is secured by turning the washer plate one eighth round,
the sides of its square hole then being no longer in coincidence with the square of
the spindle will prevent the knob coming off, or getting loose by reason of the
angles of the square spindle engaging with the washer and jamming.
The washer is arranged to jamb by its curved projections H¹ pressing upon the
knob, it may be rendered more secure by forming rebates or recesses, on the knob
into which the curved projections will slip and be retained.
A sectional view of a knob and washer in position on one end of a spindle is
sbown at Figure 6, an outer view of one washer at Figure 7 and a view of a
washer locked on a spindle at Figure 8.
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
The improved springless door latch, substantially as described and illustrated, in
the accompanying drawings.