IMPROVED MEANS FOR SECURING OR FASTENING THE SLIDING SASHES OF WINDOWS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Robert Plush at the Office of the
Commissioners of Patents on the 11th November 1882.
ROBERT PLUSH, of 12 St Ann's Road, Brixton, in the County of Surrey
"IMPROVED MEANS FOR SECURING OR FASTENING THE SLIDING SASHES OF
WINDOWS
"
The object of my Invention is to fasten the sliding sashes of windows so that it
shall be impossible to open them, either from the inside or outside, except by the
proper persons who are provided with the necessary means of gaining access to the
fastening, which is concealed in the framework of the window itself, while at the
same time the sashes may, if desired, be left free to open a certain distance only,
and no further, either at top or bottom, or both, for the purpose of ventilation, or
they may be opened to the required extent and secured in such position, so that it
is impossible to alter the same.
The sliding sashes (which may be of any suitable construction) are not fitted with
any fastening device at the meeting rails, but on one side and at any suitable
height, a kind of box is let into the edge sliding against the window frame, so as to
bring its open side flush with the surface of the edge. Suitable ears or lugs are
formed on the box for fastening it in position by screws or other suitable means.
These ears or lugs will preferably be formed at the top and bottom of the box, with
their outer surfaces flush with the open side, so that the recess in the edge of the
sliding sash will have to be made only deep enough at the top and bottom to
receive the ears or lugs, while in the middle it will be of the full depth of the box.
The inside of the rear or back of the box is provided with a series of depressions
or recesses.
A kind of small cupboard or recess is formed in or by the side of the window
frame and fitted with a door capable of being secured by lock and key, so that
access to the fastening which secures the sliding sashes, can only be obtained from
the inside and by first opening the door of the cupboard. In the side of this
cupboard forming part of the surface against which the sash slides, a metallic
plate is inserted in such a position that when the sash is closed, the box inserted
in the edge of the latter will be directly opposite the plate.
Through a threaded hole tapped through the plate works a screw bolt provided
with a suitable head at the end within the cupboard or recess in the window frame,

page_text: so that by turning the bolt in one direction its outer end will be caused to poject
into the box.
If desired to secure the sash in a fixed position (either closed, or opened to a
limited extent) the bolt is turned until its outer end engages with one of the
recesses formed in the rear or back of the box.
If on the contrary it is desired to allow the sash to remain capable of being
either closed, or opened to a limited extent, the bolt is caused to enter the box but
without engaging with either of the recesses in the rear or back of the box,
whereby the sash may be either closed, or opened to the extent of the length of
the open space enclosed by the box, and which will vary according to different
requirements.
When desired to open the window to its full extent, or for any distance beyond
the limited range described, the bolt is turned in the necessary direction until its
outer end is entirely disengaged from the open box.
In place of using a screw bolt, a sliding bolt (with or without a spring) might
be employed and suitable means provided for fixing it in the required positions.
A similar arrangement to that above described will be used for each sash, when
both of them are made moveable, and it may be placed on either side of the
window, or if found necessary one might be placed on each side thereof.