Improved Means or Apparatus for Locking and Unlocking Automatically Window Sashes and the like.
Year: 1891

page_text: Date of Application, 1st June, 1891
Complete Specification Left, 1st Mar., 1892-Accepted, 2nd Apr., 1892
PROVISIONAL DE MULTICATION.
Improved Means or Apparatus for Locking and Unlocking
Automatically Window Sashes and the like.
1, GEORGE CHISHOLM Junior, of 72 Port Street, in the Town and County of
Stirling, North Britain, Plumber, do hereby declare the nature of this invention to
be as follows:-
This invention which relates to an improved means or apparatus for locking and
unlocking automatically window sashes and the like, has for its object to provide
means or apparatus whereby the sashes may be locked on the inside with the top
sash partly open or down, and at the same time prevent the sashes being opened
from the outside.
In carrying out my said invention I mount or otherwise secure, in the central
bead of the window at the junction of the upper and lower sashes, a brass or other
metal plate, which has provision formed on it for carrying a small double armed
rocking lever, and which is also provided at its top end with a small bevelled guard
plate which protects the wood of the upper sash.
The said rocking lever is caused to engage by means of its shape with a pivotted
double armed bracket, screwed or otherwise secured to the top of the lower sash,
and in openings or recesses formed in a brass or other metal plate, screwed or
otherwise secured to the inside face of the upper sash, the said plate having two,
three or more of such openings or recesses forined in it the one above the other and
at any desired distance apart. The whole being such that the upper sash cannot
be moved unless the rocking lever is out of gear with it, which can only be effected
by means of raising the lower sash, which in order to prevent it from being raised
from the outside is provided with a suitable sill lock or snib, preferably composed
of a pivotted ring or eyelet, made of brass or other metal, and screwed or otherwise
secured to the lower inside edge of the lower sash, the said ring or eyelet is provided
with a projecting catch which engages with a corresponding catch or sneck screwed
or otherwise secured to the lower part or sill of the window frame, the said catches
being disengaged from each other by means of raising the ring or eyelet.
It is to be understood that I may employ the foregoing arrangement of sash lock
on one or both sides of the window according to the size and weight of the said
sashes, and that the said arrangement of sash lock or locks may be used in com-
bination with any desired kind of sill lock or locks, as well as with the one
hereinbefore described.
Dated this 20th day of May 1891
JOHNSONS,
115, St. Vincent Street, Glasgow, Applicant's Agents.
COMPLETE SPECIFICATION.
Improved Means or Apparatus for Locking and Unlocking
Automatically Window Sashes and the like.
1, GEORGE CHISHOLM Junior, of 72 Port Street, in the Town and County of
Stirling, North Britain, Plumber, 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 which relates to an improved means or apparatus for locking and
unlocking automatically window sashes and the like, has for its object to provide
means or apparatus whereby the sashes may be locked on the inside, with the top

page_text: sash partly open or down, and at the same time prevent the sashes being opened
from the outside.
1
In carrying out my said invention as illustrated in part elevation Figure 1, and
sectional elevation (taken on line 1, 2, of Figure 1) Figure 2, I mount by screws
or otherwise in central bead A. of the window at the junction of the upper sash B,
and lower sash C, a brass or other metal plate D, which has provision formed on it.
for carrying a small double armed rocking lever d, and the said plate D, is also
provided at its top end with a bevelled guard plate which protects the wood of
the upper
sash B.
The one end of said rocking lever d is caused to engage by means of its shape
with a pivotted double armed bracket E, screwed or otherwise secured to the top
of the lower sash C, and its other end d³ is also caused to engage in openings or
recesses, formed in a brass or other metal plate F, screwed or otherwise secured
to the inside face of the upper sash B, the wood of which is also recessed behind the
recesses f, of the plate, which may have two, three or more of such recesses f,.
formed in it the one above the other at any desired distance apart, or each recess
may be formed in a seperate plate, and two of more of such plates used.
The foregoing arrangement is such that the upper sash B, cannot be moved unless
the the rocking lever is out of gear with it, that is its end must not be engaged
with any of the recesses, and which can only be effected by means of raising the
lower sash C, which in order to prevent it from being raised from the outside is
provided with a suitable sill lock or snib G, preferably composed of a pivotted ring
or eyelet g, made of brass or other metal, and screwed or otherwise secured to the
lower inside edge of the lower sash C, the said ring or eyelet g, is provided with a
projecting catch g' which engages with a corresponding catch or sneck g³ screwed
or otherwise secured to the lower part or sill of the window frame, the said
catches g' and g² being disengaged from each other by means of raising the ring or
eyelet g.
It is to be understood that I may employ the foregoing arrangement of sash lock
on one or both sides of the window according to the size and weight of the said
sashes, and that the said arrangement of sash lock or locks may be used in com-
Bination with any desired kind of of sill lock or locks as well as with the one
herein before described.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what
claim is
1st. Providing window sashes with one or more sash locks each consisting of a
plate D having pivotted lever and guard plate d', double armed bracket E and
plate F with recesses, substantially as and for the purposes hereinbefore described
with reference to and shown in the annexed drawings.
2nd. The combination with one or more sash locks of one or more sill locks G
substantially as and for the purposes herein before described with reference to and
shown in the annexed drawings.
3rd. The general arrangement, construction, and combination of the various
parts constituting my improved apparatus for locking or unlocking window sashes
and the like substantially as hereinbefore described and shown in the accompanying
drawings.
4th. My improved means for locking window sashes and the like, whereby the
top sash may be left partly open at top and both sashes locked on the inside so as
to prevent them being opened from outside, substantially as herein before described.
Dated this 29th day of February 1892.
JOHNSONS,
115, St. Vincent Street, Glasgow, Applicant's Agents.