Year: 1899

page_text: I, JAMES ROBERTSON, of New Brighton, near Christchurch, Canterbury, New
Zealand, Printer, 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 simple and effective window lock cap-
able of being manufactured at small cost and so constructed and arranged as to be
self locking.
This window lock is intended more particularly for windows having sliding
sashes, but it can be adapted for window casements or for sashes pivotally hung,
as hereafter explained.
My invention consists of a metal barrel or casing containing a bolt provided
with a spiral spring and suitable knob; a loop or strap being pivotally attached
to said barrel or casing; which latter is attached (in the case of windows having
vertically sliding sashes) to the meeting rail of lower sash, a suitable socket to
receive end of bolt, being attached to the meeting rail of upper sash.
In the case of sashes sliding horizontally, the said barrel or casing with bolt
would be attached to the meeting rail of inner sash, and the socket to the meeting
rail of outer sash.
To open the sashes fitted with the window lock the knob is drawn back and
the lower sash raised to allow the bolt to clear the socket, when the loop or
strap falls over the end of bolt and holds it back until the window is closed
again, when the end of said loop or strap is lifted by coming in contact with
the edge of the socket on upper sash, allowing the bolt to shoot into said socket
and thus securely lock the window.
In a modification of the lock, the loop or strap is dispensed with, the end of bolt
being bevilled so as to spring back when coming in contact with said socket.
If the lock is required for casements, a small spring is fitted on the barrel or
casing to retain the loop or strap in position as hereafter explained.
Referring to the accompanying drawings forming part of this specification, in
which the same letters of reference indicate corresponding parts where they
occur in the several figures.

page_text: Fig. 1, represents a section through the meeting rails of a pair of vertically
sliding sashes showing my window lock attached; the sashes being closed and
locked.
Fig. 2, is a plan of same.
Fig. 3, represents a section through the meeting rails of a pair of similar
sashes with fock attached, but the sashes being slightly open.
Fig. 4, is a section through the meeting rails of a pair of similar sashes showing
the window lock in section, locked.
Fig. 5, is a section through the meeting rails of a pair of similar sashes closed,
showing a modified form of the lock attached and locked.
Fig. 6, is a similar section showing the sashes open:
Figs. 7 and 8, are sectional plans showing the window lock attached to a window
casement, and provided with a spring for retaining loop or strap in position.
Referring to Figs. 1, 2, 3 and 4, A is the barrel or casing attached to meeting
rail B of lower sash, and containing a bolt C, the inside portion of which is
reduced in diameter in order to form a shoulder at (a); another shoulder (b)
being formed with said barrel or casing.
A spiral spring (c) is placed around the bolt and between the shoulders (a)
and (b), a suitable knob D being screwed or otherwise fastened to the bolt, the
shank passing through a slot (7) formed in barrel or casing. E is a loop or
strap pivotally attached to sides of said barrel or casing and provided with a
lip or flange (e) at outer end..
1
Fis a socket secured to the meeting rail G of upper sash to receive the end of
bolt C when the sashes are closed.
When the sashes are closed and locked, the loop or strap E should be in the
position shown in Fig. 1.
When it is desired to open the window, the-knob-D_is_drawn back to free the
bolt from the socket F, and the lower sash raised at the same time (or the upper
sash lowered as may be desired) when the loop or strap E instantly falls over the
end of the barrel or casing and holds the bolt back until the sashes are closed
again, when the moment the lip or flange (e) comes in contact with the socket F
(see Fig. 3) the loop or strap E is caused to rise and thus allow the bolt, by the
action of the spring (c), to shoot into the socket F and thereby securely lock the
window.
If desired, after the window is closed and locked, the 'loop or strap E may
be drawn over, into the position shown in Fig. 4, thus further securing the
window.
Referring to Figs. 5 and 6, A¹ is the barrel or casing attached to meeting rail B¹
of lower sash. C is the bolt provided with spring and knob as before described,
but the outer end of bolt is bevilled on the underside as shown. is the
socket on meeting rail G of upper sash, into which socket the bolt shoots.
In this arrangement the loop or strap shown in Figs. 1, 2, 3 and 4 is dispensed
with, the bevilled end of bolt striking the socket F1, when closing the sashes,
enables the bolt to shoot back and allow the sashes to be closed when, by the
action of the spring c¹, the bolt is caused to shoot into the socket F¹ and thus
lock the window.
Referring to Figs. 7 and 8, A2 is the barrel or casing attached to the stile of a
casement B2, and containing the bolt with spring and knob as before described and
provided with loop or strap E¹, but also having a spring (f) secured on the
inner side of said loop or strap so as to press against the heel or back end of
same as to retain said loop or strap over end of bolt as soon as it is drawn
clear of the socket to open the casement. When the loop or strap is turned over
to the opposite side of barrel or casing as shown in Fig. 8 the spring similarly
retains it over the other end of bolt.
is the socket attached to jamb or frame of casement G2 (or to the other
casement if there is a pair) into which socket the bolt shoots when the casement
is closed.

page_text: This last form of lock could be applied to sashes pivotally hung, the barrel or
casing containing bolt being attached to the sash and the socket attached to the
frame.
My self acting window lock cannot be unfastened from the outside without
breaking the glass.
It is evident that the shape of the barrel or casing and socket may be altered
or varied without departing from the spirit and scope of my invention, hence I
do not wish to limit myself strictly to the construction set forth but:-
-
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
(1) The herein described self acting window lock constructed arranged and
operating in the manner substantially as herein described and illustrated in the
accompanying drawings.
(2) In a window lock, the combination with a barrel or casing A and socket F
of a bolt C within said barrel or casing, such bolt being provided with a
shoulder (a) a spiral spring (c) around said bolt, one end abutting against said
shoulder, and the other end abutting against a shoulder (b) formed in said barrel
or casing; the said bolt being also provided with a knob D capable of sliding
in a slot (d) in barrel or casing; and a drop loop or strap E pivotally attached
to said barrel or casing, substantially as set forth.
(3) The combination in a window lock of a barrel or casing A¹ and a socket F",
of a bolt C within said barrel or casing, the outer end of such bolt being bevilled,
and having a shoulder within said barrel or casing, a spiral spring (c) around said bolt,
one end abutting against said shoulder and the other end abutting against a
shoulder formed in said barrel or casing; a suitable knob attached to said bolt
capable of sliding in a slot in said barrel or casing substantially as set forth.
(4) In a window lock applicable to window casements, the combination of a
barrel or casing A² and socket F2, of a bolt provided with a spiral spring and
suitable knob, a loop or strap E¹ and a retaining spring (f) substantially as set
forth.
Thatod thi COLL 1