Improvements in Sash Locks.
Year: 1892

page_text: Date of Application, 14th Apr., 1892-Accepted, 14th May, 1892
Improvements in Sash Locks.
We, CHARLES ALTEMAN, Machinist, and DUNCAN CAMPBELL CAMERON
MACDONALD, and JAMES GRANT Insurance Officers, all residents of the City
of London, in the County of Middlesex, in the Province of Ontario, Canada, 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:-
This invention relates to a device for automatically locking window sashes,
closed, or at any position to which they may be elevated.
In the accompanying drawings:
1
Fig. 1. is a view of a portion of a window frame and window sash, and a sash
lock embodying our invention, showing the locking dogs adjusted back from the
window frame, to permit the window sash to be adjusted perfectly free.
Fig. 2. is another view of same, showing the cover removed, and the locking
dogs engaged with the window frame.
. Fig. 3. is a sectional view on the line x, x, of Fig. 1.
C, designates a case, in which the locking parts are enclosed, this case, C,
prevents objects from interfering with the operation of the locking parts, and also
prevents them from being damaged, and the side of this case adjacent to the
window frame, G, is open to permit of the engagement of the dogs, L, with said
window frame.
A, designates a cover for this case, C, in which cover, the elongated slots, B, are
formed.
S, designates a standard in the case, C, which forms a convenient means for
supporting the spring, D, and to secure the cover and case together by a screw, K,
passing through the cover, and into a screw threaded socket in said standard.
L, L, designate locking dogs, each of which is formed with the trunnions, T,
curved serrated face, F, and operating handle, H.
D, designates a spring, which is supported on the standard, S, the arms of
which spring engage with the locking dogs, L, to automatically engage, and to
retain engaged, said locking dogs with the window frame, G, when not under the
control of an inside operator.
The trunnions, T, are formed on the locking dogs, L, eccentrically to the curved
face, F, so that when said locking dogs engage with the window frame, the greater
the pressure brought to bear on the window sash, I, to raise or lower it, the more
rigidly will the window sash be held because in attempting to move the sash in
either direction (without adjusting the operating handles, H,) the longer radius of
the curved face, F, will be adjusted between the window frame, G, and the
trunnions, T, this will rigidly lock the sash, I, at this position.
These trunnions form the axis of the locking dogs, L, and are supported in
sockets, R, formed in the case, C, and cover, A.
The face, F, is curved, so that the longer radius of the locking dog, L, will be
gradually adjusted between the trunnions, T, and the window frame, G, and this
face, F, is formed serrated, so that it will take a firm grip on the window
frame, G, and completely prevent the locking dogs from slipping.
H, H, are the operating handles, which extend through the slots, B, in the
cover, A; the slots, B, being elongated, to permit the handles, H, to be freely
operated therein, and the handles, H, are moved towards each other, for the
purpose of disengaging the locking dogs, L, from in contact with the window
rame, G, to permit the window sash to be raised or lowered, perfectly free when
equired.

page_text: This case, C; containing the locking parts may be mortised in the window sash, I,
adjacent to the window frame, G, or it may be secured to said sash, I, by the
screws, N, N, as shown in Fig. 1.
And by providing two locking dogs, arranged as shown in Fig. 2. the upper one
will prevent the sash from being raised, and the lower one, prevent the sash from
being lowered, so that the window sash will be securely locked, to prevent it from
being either raised or lowered.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
The locking dogs, L, L, formed with the trunnions, T, the operating handles, H,
and curved serrated faces, F, in combination with the case, C, standard, S, the
cover, A, formed with the elongated slots, B, and the spring, D, substantially as
shown and described, and for the purpose specified.
Dated this 23rd day of March 1892.
CHARLES ALTEMAN.
DUNCAN CAMPBELL CAMERON MACDONALD.
JAMES GRANT.