An Improved Window Fastening.
Year: 1899

page_text: Date of Application, 18th Dec., 1899-Accepted, 24th Feb., 1900
An Improved Window Fastening.
I, JAMES GEORGE LUSK, of Tudor Street, Hamilton, in the Colony of New
South Wales, Engineer, do hereby declare the nature of my 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 which will fasten of itself
as soon as the window is closed and which is inexpensive, simple and effective.
My apparatus consists of a short bolt or ram operated by a spiral spring and
fitting into a catch of peculiar construction.
The various parts of my mechanism are shown in detail in the accompanying
drawings.
Figure 1 is plan showing my apparatus locked on a closed sash.
A is upper face of bottom portion of the upper sash of a window.
B is upper face of top portion of the lower sash of a window.
B is upper face of top portion of the lower sash.
C is base plate of the catch screwed on to A.
Dis base plate of the bolt-casing screwed on to B.
E is the bolt here shown shot forward to its full extent.
F is a pin fastened to the bolt E (hereinafter called the releasing pin). This
pin is secured to the bolt near its forward end, its use and exact position being
hereinafter more fully described.
Gis a curved bracket having one end secured to the plate C and the othe
overlapping the bolt E as shown.
L is a narrow strip or bar rising at right angles to the plate C for the purpose
hereinafter set forth.
His casing in which the bolt E slides and which covers the spiral spring
operating the said bolt.
J is handle pin of bolt and K is a zig-zag slot cut in the casing H along which
the said handle-pin travels as herein-after described
Figure 2 shows same parts as Figure 1 with bolt withdrawn and window con-
sequently unlocked.
Figure 3 is end view of my apparatus.
Figure 4 is section through Figure 1. The same letters indicating the same
parts with the addition that the spiral spring is here shown and lettered M
also an upright plate N for the purpose of preventing the bolt shooting out too
far should the pin J become displaced.
To explain the operation of my lock I shall revert to Figures 1 and 2. In the
latter (Figure 2) the bolt is shown drawn back so that the sashes are unlocked.
When the lock is in this position the upper saslı can be lowered
or the lowered sash can be raised (or both) and the window thus
opened without the lock being interfered with. But as soon as the window is
closed again that is when the surfaces A and B are brought again into one plane
the bar L strikes the releasing pin F thus revolving the bolt E sufficiently to
carry the handle-pin J clear of the angle H¹ of the casing H which hitherto held
Price 71

page_text: it in position. When thus released the bolt is shot forward by the spiral spring
and the handle J flies along the slot K when striking the bend H2 it is thereby
diverted along the cross-channel K³ of the slot till it takes up the position shown
in Figure 1. While the handle J is travelling along the horizontal portion of
the slot K between the points Hand H2 the releasing pin F passes between
the bar L and the end of bracket G. When the handle is diverted into the
cross-channel K2 it carries around the bolt and with it of course the pin F till the
latter is forced into the position behind the bracket G shown in Figure 1. The
window is then securely locked and the sashes can if desired be drawn more
tightly by pressing the handle J further down the cross-channel K2 as this would
force the pin F further up the slanting edge of the bracket G (see Figure 1).
When it is desired to unbolt the window the handle J is forced back along the
cross-channel K2 of the slot K to the point H2 which action partially revolving
the bolt E carries the pin F clear of the bracket G. Then when the handle J is
forced along the horizontal channel of the slot K from H2 to H' the bolt is drawn
quite clear of the bracket G. The handle is then forced the second cross-
channel into the position shown in Figure 2. This further rotation of the bolt E
brings the pin F hard down on the upper edge of the plate L and to complete the
operation it will be necessary to slightly raise the lower, or lower the upper sash,
as otherwise the plate L being in contact with the pin F would prevent the
necessary rotation of the bolt E.
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
1. In an automatic window lock a bolt such as E propelled by a spring such
as M within a casing such as H and fitted with a releasing pin such as F and
a handle pin such as J of the nature and for the purpose herein set forth.
2. In an automatic window lock a casing such as H provided with a slot such
as K of the nature and for the purpose herein set forth.
3. In an automatic window lock a catch consisting of a curved bracket such
as G in combination with a vertically set bar such as L of the nature and for
the purpose herein set forth.
4. In an automatic window lock, the combination and arrangement of a sliding
bolt such as E fitted with a handle pin such as J operated by a spring such as
M with a casing such as H provided with a zig-zag slot such as K of the nature
and for the purpose herein set forth.
5. In an automatic window lock, the combination and arrangement of a sliding
bolt such as E operated by a spring such as M and fitted with a releasing pin
such as F and a handle-pin such as J in a casing such as H provided with a slot
such as K with a vertically set bar such as L and a bracket catch such as G for
the nature and for the purpose herein set forth.
1000
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.