Improvements in Fasteners for Window Sashes, Sliding Doors, or Shutters.
Year: 1889

page_text: Date of Application, 20th Feb, 1889.
Complete Specification Left, 18th Apr., 1889
Complete Specification Accepted, 1st June, 1889
PROVISIONAL SPECIFICATION.
Improvements in Fasteners for Window Sashes, Sliding Doors, or
Shutters.
I, JOHN HENRY EVANS, of 159 Wardour Street, W., in the County of Middlesex,
Engineer, do hereby declare the nature of this Invention to be as follows:-
The main object of my invention is to provide an improved form of fastener, which will
automatically lock a window sash by the mere act of closing the said sash. The
fastener consists of a small plate affixed to the side of the sash, having a recess, within
which is pivotted a small tuinbler inclined on the outer side. The said tumbler can be
turned back into the recess and retained therein by a catch, but when the catch is
released the tumbler is forced out by a spring behind it. A plate with a projecting
lug is fixed on the window frame.
The action of the fastener is as follows:-When the sash is closed the inclined side
of the tumbler coming in contact with the fixed lug on the window frame pushes the
said tumbler back into its recess, but as soon as the tumbler has passed the lug it
springs out again and prevents the sash being opened, because the end of the tumbler
abuts against the lug. To open the window the tumbler is moved back into the recess
and secured by the catch, when the sash can be raised, but the catch is pushed back
in passing the fixed lug, so that the tumbler automatically springs out ready to lock
the window again when the sash is closed.
By fixing the frame with the tumbler and catch to the side of the upper sash, and
fixing a plate or lug on the top of the lower sash, the apparatus will lock both sashes
at the same time, and by fixing two or more frames and tumblers on the upper sash,
the window can be locked either with the sashes shut, or when they are left open to a
certain distance or distances.
Although I have described my invention as applied to a window sash it is equally
applicable to sliding doors, or shutters of various kinds.

page_text: COMPLETE SPECIFICATION.
Improvements in Fasteners for Window-sashes, Sliding Doors, or
Shutters.
I, JOHN HENRY EVANS, of 159 Wardour Street, W., in the County of Middlesex,
Engineer 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 main object of my invention is to provide an improved form of fastener, which
will automatically lock a window sash, by the mere act of closing the said sash.
In the accompanying sheet of drawings, Fig. 1 is a front and Fig. 2 a back elevation
of my improved fastener; Fig. 3 is a sectional view of a pair of window sashes, locked
by the said fastener; Fig. 4 is a similar view, shewing the fastener in position to permit
the sashes to be opened; and Fig. 5 is a similiar view shewing the sashes partly
open; Figs. 6 and 7 are respectively side and front elevations shewing a modification
in part of the apparatus,
Similiar letters of reference denote similiar parts throughout the drawings.
A is the upper and B the lower sash of a window, C is a plate or frame let into
the upper sash, and formed with a slot within which is pivotted a tumbler D, having
a projecting end with an inclined face D¹, E is a catch or trigger pivotted in the
frame Cin front of the tumbler D, and F is a spring bearing against the back of the
tumbler and tending to force it outwards. When the trigger E is pulled downwards,
the tumbler is forced back into the slot in the frame, and held in that position as shewn
in Fig. 4, but when the trigger is pushed back the tumbler is forced out again by
the spring. A small boss or plate H is fixed upon the lower sash B or may be let in
flush with the top of same, if desired.
The action of the fastener is as follows :- -When the parts are in the position
shewn in Fig. 3 the under-side of the tumbler D abuts upon the plate H, and securely
locks both sashes. To open the window the trigger E is turned down, which pushes
the tumbler D back into the slot and there holds it clear of the plate H, as shewn in
Fig. 4, and either sash can then be moved. In opening the window, the plate H
comes in contact with the trigger E, and knocks it back into place, as shewn in Fig. 5.
The tumbler D then bears against the sash B, and as soon as the window is closed,
automatically springs forward over the plate H, locking the sashes as before. A small
roller J is preferably provided in the tumbler to avoid the friction of the tumbler
rubbing against the sash.
Two or more frames C, may, if desired, be fixed in the upper sash A, at certain
distances above one another, so that the window can be locked, either with the sashes
shut, or when they are left open to a certain distance, or distances.
If it be desired to lock the sashes independently of each other, a frame C can be
fixed on each sash, the plates H being affixed in the required position on the frame of
the window.

page_text: Although I have described my invention as applied to a window-sash, it is equally
applicable to sliding doors, or shutters of various kinds.
The piece H does not necessarily form part of my apparatus, as the edge of the
sash B would answer as an abutment for the tumbler D, but a metal plate is preferably
employed, for the wooden edge of the sash would soon become worn or indented by
use.
.
Although it is practically impossible to open the fastener from the outside, 1 have
shewn in Figs. 6 and 7, the piece H as provided with a vertical plate or guard K,
which would effectually prevent a wire or thin strip of metal being passed between
the piece H and the tumbler D from the outside of the window between the sashes, in
order to force back the tumbler, and so allow the window to be opened.
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
I claim is
1. A device for automatically locking a window-sash, sliding door or shutter, con-
sisting of a frame C, with tumbler D, trigger E, and spring F, substantially as herein
set forth.
2. A device for automatically locking a window-sash, sliding door or shutter, con-
sisting of a frame C, with tumbler D, trigger E, and spring F, in combination with a
piece H, substantially as herein set forth.
3. A device for automatically locking a window-sash, sliding door or shutter, con-
sisting of a frame C, with tumbler D, trigger E and spring F, in combination with a
piece H, having a guard plate K, substantially as herein set forth.
Dated this 18th day of April 1889.
AMBROSE MYALL,
21, Cockspur Street, S.W.,
Agent for the Applicant.
AMBROSE MYALL,
21, Cockspur Street, S.W.,
Agent for the Applicant.