Improvements in Window Sash Fasteners.
Year: 1897

page_text: Date of Application, 20th Dec., 1897-Accepted, 29th Jan.,
1898
COMPLETE SPECIFICATION.
Improvements in Window Sash Fasteners.
I, GEORGE CORNWALL NICHOLSON, of Collins Street, Melbourne, in the Colony
of Victoria, Dentist, 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 this invention is to provide a sash lock or fastening adapted when
unlocked to become locked automatically in certain cases as hereinafter particu-
Jarized, and of such improved construction generally as to defy all ordinary
efforts to burglariously force open the lock from without.
The fastener is illustrated in the accompanying drawings in which the same
reference letters indicate like parts throughout the figures.
Figure 1 is a side sectional elevation showing the fastener with its spindle re-
tracted: Figure 2 is a side sectional elevation showing the normal locked position,
that is, with the spindle not retracted: Figure 3 is a sectional elevation on the
line 7-7 in Figure 1: and Figure 4 is a sectional plan view looking down from
the line 8-8 in Figure 1. In Figures 1 and 2 the sashes are partly shown, the
meeting rail of the upper sash marked 5, and that of the lower sash G.
The lock has a casing A, and a staple B, a spindle C (partly within and partly
without the casing) having any convenient outer end handle or knob D, and at
its inner end connected pivotally by a pin E, or the like to a tumbler F which is
pivoted to the casing as shown at G. A horn H extends from the tumbler down-
wardly, and passes through a slot I in a bolt K, the end of which nearest the
staple is subjected to constant upward pressure by means of a spring L, the said
end thereby pressing upward on the upper lip N of an aperture M in the casing.
O is a notch or depression in the bolt into which the upper lip N is adapted to,
and will fit when the bolt K is protruded as shown in Figure 1. P is a projection
from the tumbler F adapted to bear against the casing in the position shown in
Figure 2, thus preventing the tumbler protruding from the casing too far into the
staple, and R is a spring slipped loosely around the spindle and arranged so as to
cause the aforesaid protrusion of the tumbler at all times except when opposed
by superior force. S is an aperture in the casing through which the spindle
passes.
T is a
pin which serves to keep the bolt K from rising too high when
retracted.
In using this invention (in which it will be observed the staple has no part
projecting beyond the edge of its meeting rail) the unlocking of the window is
effected by retracting the end or knob D until the radial swing of the horn H has
shot the bolt K forward until the notch O has come under the lip N into
engagement with which it enters immediately by the pressure of the spring L.
In this position the tumbler F is retracted clear of the opposite meeting rail of
the window, and of the staple hereon, compressing spring R, as seen in Figure 1.
The window may now be opened, but the act of opening will cause the pro-
jecting end of the bolt K to be depressed by being struck by the inner top end of
the staple; and immediately the bolt is sufficiently depressed it will be retracted
automatically in consequence of the pressure of the spring R throwing forward

page_text: the upper end of the tumbler F and so swinging the horn H backward. The
consequence is that when the window is open the parts have the position shown
in Figure 2. Upon the shutting of the window the top outer edge of the staple
strikes against the projecting under face U of the tumbler F, and forces it back.
It will be observed that the notch O is placed so far back from the staple end of the
bolt K, that the staple never pushes back the tumbler far enough to bring the
notch into engagement with the lip N. The aperture M for the bolt is under-
neath the aperture in the casing for the tumbler. It will be further understood
that minor modifications of detail may be made within the scope of this invention
and of my claims.
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. In a sash lock or fastening the combination within a casing of a pivoted
tumbler having a horn H engaging a bolt K having a notch O an aperture facing
the staple for the protrusion of the tumbler, another aperture (underneath the
aperture for the tumbler) for the protrusion of the bolt, and springs K and L
respectively operating the tumbler and the bolt, substantially as and for the
purposes set forth.
2. In a sash lock or fastening the combination within a casing (A) of a pivoted
tumbler (F) having a projection (P) and horn (H), with a spindle (C) pivotally
connected to the said tumbler, and passing through a spring (R) and through
an aperture (S) in the casing so as to have an external end or handle (D),
substantially as and for the purposes set forth.
3. In a sash lock or fastening the staple and the casing (A) with the lip (N)
the pivoted tumbler (F) having the horn (H) engaging a bolt (K) having a
notch (0) (not adapted to engage with lip N when the tumbler is actuated by the
staple), and the pin (T), all in combination substantially as and for the purposes
set forth.
4. The sash lock or fastening in its entirety comprising the combination of all
the parts exhibited in the drawings, substantially as hereinbefore described.
Dated this 20th day of December 1897.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.