Improvements in Window Sash Fastenings.
Year: 1898

page_text: Date of Application, 27th Sept., 1898—Accepted, 5th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in Window Sash Fastenings.
We, EDWARD JOHNSTONE, of Hobart, in the Colony of Tasmania, Gentleman,
and ERNEST SYDNEY Ross, of Hobart, in the Colony of Tasmania, 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:-
Whilst there are innumerable sash fastenings already devised, the present
invention is of such a simple character and adapted to be so cheaply carried out
that it is well adapted to come into extensive use.
In our invention we employ a bolt sliding in a framing which is to be attached
permanently to the meeting rail of the lower window sash, and we so arrange a
handle or knob by which the said bolt is actuated that when (in order to lock the
window) the handle is pushed forward the bolt advances until its end enters a
keeper affixed to the meeting rail of the upper window sash whilst a pawl or catch
then automatically enters a notch in the said bolt and thus locks the bolt in its
forward position. When however, the window is to be unlocked the said handle
or knob must first be depressed, and then pulled backwards; the said pawl or
catch is released by the depression of the handle, thus allowing the bolt to be
withdrawn.
In the drawings herewith, we show our invention and have designated like
parts by the same letters of reference. Figure 1 is a perspective view of the
keeper Z with part of the meeting rail of the upper sash to which it is affixed.
Figure 2 is a perspective view of the fastening (with the knob or other handle
omitted) affixed to the meeting rail of the lower sash.
Figure 3 is a side elevation of the bolt and knob-post, with the movable knob
(shown in section) in its uppermost position, the lowermost position being indicated
by a dotted line."
Figure 4 shows the fastening in perspective when the parts shown in Figure 3
are removed.
Figure 5 is a side elevation of the fastening in the unlocked position.
A indicates the bolt, B a transverse notch therein and C the bevelled upper
front end of said bolt. D) is the frame of the fastening having bent up wings E, F
which are arranged to form a slideway for bolt A. The wings E of said frame
have also lugs G, which are connected together by a fixed pin H. A pawl J is
pivoted on the pin H, between the lugs G the front end K of each side of the
A knob-
pawl being curled round the pin as shown in dotted lines in Figure 5.
post L is fixed permanently to the bolt, and passes upwardly through a slot M
in the rear part N of the pawl (i.e. the part behind the pivots). The post is
also shown passing up through a slot O in a spring P. This spring is fastened
to the said rear part N which it presses upward and thus keeps the front end Q
of the pawl depressed. The free end of the spring rests on the bolt A in the form
shown in the drawings but the spring might be arranged in various ways and
be of spiral or other suitable form. R is a knob or handle (either spherical,

page_text: cylindrical, reel-shaped, or of other suitable shape) arranged upon or around the
post L so as in the first place to be able to slide up the same sufficiently to allow
the spring P to cause the pawl end Q to enter the notch B, and in the second place
able to slide down the same sufficiently to enable the rear part N to be depressed,
so as to raise the pawl end Q out of the notch B, when the operator wishes to
unlock the window.
In using this invention the bevelled edge C of the bolt will, if the upper sash
is not quite as high as it should be, when the bolt is pashing forward, tend to
press the same upward by its pressure within keeper Z, and when well fitted the
bolt of the fastener will be in, contact with inner surface of the keeper and will
act as an anti-rattler.
It should be observed that the pin H is so located that the parts of the pawl
which curl around the said pin either contact with the bolt A (which is below) or
nearly contact therewith, thus acting as stops against any improper attempt to
force the bolt upward. The wings E, F also secure,the bolt against upward or
lateral movement.
"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:
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'
1. In combination, in a fastening of the kind set forth; a bolt A having a
notch B, a framing D having wings E, F forming a slideway for the bolt and
holding the same against movement upward or laterally, lugs G on the wings E,
a connection between said lugs and a pawl pivoted to said connection and adapted
to be forced in to the said notch by a spring substantially as set forth.
2. In combination, in a fastening of the kind set forth, a sliding notched bolt,
a framing having guides therefor a slotted pawl pivoted to the framing and having
a spring normally causing depression of the front end of said pawl and a post
affixed to the said bolt said post having a movable knob or handle thereon adapted
to depress the rear part of the pawl, and retract the bolt substantially as set forth.
3. In a window sash fastening the general combination or arrangement of the
whole of the parts substantially as described.
Dated this 27th day of September 1898
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.