Improved Window-fastening.
Year: 1890

page_text: Date of Application, 7th June, 1890
Complete Specification Left, 7th Mar., 1891-Accepted, 6th June, 1891
PROVISIONAL SPECIFICATION.
Improved Window-fastening.
I, JOHANNES BÜRDE, of 12 St. Charles Square Notting Hill in the County of
Middlesex, Gentleman, do hereby declare the nature of this invention to be as
follows:-
The object of my present invention is to provide an arrangement for fastening
windows, by means of which more perfect security against surreptitious opening of
windows is obtained than by the ordinary fastenings now in use.
Further, by the employment of the fastening arrangements constructed according
to my invention as hereinafter described, the annoyance caused by window sashes
rattling against one another is obviated, and I also include in my invention the
provision of a device for preventing draught through badly fitting sashes, which
also allows in case of necessity that admission of air for purposes of ventilation may
be allowed, also without causing unpleasant draughts.
In carrying my invention into practical effect, I adopt substantially the following
arrangements :-
To the inside sash of the window is fixed a vertical catch or projecting piece, over
which is passed a loop or opening in a band or strap of metal or suitable material
fixed to the outer sash by a kind of hinge fastening, the end of such band or con-
necting strap, where it is hinged or fastened to the sash terminating in an oval or
eccentric formation, and supported by a small spindle held in bearings fixed upon
the sash. Behind the oval or eccentric termination of the part just described, is a
flat steel or other spring, a similar spring being likewise placed just inside the catch
or projection upon the inner sash aforesaid. These two springs each have a tendency
to hold the sashes apart when the window is closed and fastened, so that the double
effect is produced of allowing when required, a suitable admission of air upwards
between the sashes, and also preventing the sashes rattling together through being
in close proximity one to the other, without being properly and tightly fitted. To
close the aperture between the sashes and prevent all chance of draught, I employ
a separate bar or piece of wood or other substance, to the centre of which (longitu-
dinally) on the under surface, I affix a round piece of rubber, either solid or tubular,
which just fits in and closes the aperture between the upper and lower sashes.
In each side of the connecting piece or strip before described is a slot, in which
a spindle moves to and fro, having at each end a knob or handle, which serves
to enable a firm grasp of the fastening to be easily obtained when closing or opening
the window.
The separate bar for preventing draught may be held in place by two hooks
on the inner sash passing through openings in corresponding projections upon
the said bar or by any other convenient means, or if preferred, this bar may be
fixed under the back part of the fastening arrangement, and be simply turned upon
the pivot on which it is mounted, in order to open the space between the sashes,
for the admission of fresh air to the apartment, or it may be held in place by the
insertion of a loose pin secured to the sash by a cord or chain. The oblong opening
in the connecting strap or clip on the inner sash, allows of the two sashes being
brought tightly together when desired so that under any condition, there will be
no draught, nor any rattling or movement between the upper and lower sashes of
the window.

page_text: COMPLETE SPECIFICATION.
Improved Window-fastening.
I, JOHANNES BURDE of St. Charles Square, Notting Hill, London, Gentleman,
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 object of this invention is the construction of a fastening for windows, to give
better security than fastenings at present in use and also to act when required as a
.draught preventer.
In carrying out my invention I prefer to adopt the arrangements shown by the
accompanying drawings, in which Sheets 1 to 5 represent various views of my
. improved fastening.
In Figs. 1 and 2, a, b indicate respectively the upper and lower sash frames. To
the sash frame a is affixed by screws the metal plate holding the bearings f, for
supporting the bracket or arm e, terminating in the handle or knob c. The arm e
is cast or formed with a wedge shaped or curved portion d, to come in contact with
the roller g, attached to a flat spring let into the edge of sash frame b. Upon
pulling the handle or knobe and thereby closing the fastening by turning the arm e
on its bearing or pivots f, the part d in its downward passage, presses against the
roller g forcing it outwards towards the clip h, until it occupies the position shown
in Fig. 2, where the fastening is closed, and held firmly by the pressure of the flat
spring and the roller 9: aforesaid.
The projecting piece or pin i on the sash frame a is for the purpose of holding
in place the arrangement for draught preventing represented in Figs. 3 and 4.
These last mentioned figures show an alternative form of fastening, in which the
fastening bracket or arm e is secured to the sash 6 instead of to sash a as in Figs. 1
and 2, and is operated for opening or closing by pushing or pulling the handle or
knob c in a horizontal direction, at right angles to the window sash. The roller n,
free to turn on end of arm o, travels to and fro in a groove or recess cut in the sash,
or between two plates of brass or other metal screwed to the sash. The arm or
bracket e is pirotted in bearings f, and when the fastening is closed as shown in
Fig. 3, it rests firmly against the bar or strip p, on the under surface or edge of
which is attached a ring or tube of rubber, or other flexible and easily yielding
substance (r) to exclude the passage of draught between the sashes a and b. When
the window is to be opened, the handle or knob c pulled outwards, to the position
shown in Fig. 4, drawing the rollern along in its groove or recess, and raising the
bracket e by means of arm o pivotted thereto. This form of fastening is secured
and the window sashes held firmly in position when closed by the end of the spindle c¹
sliding into the opening c² of the top sash when the window is to be fastened. It
will be seen that the pulling of the handle or knob c draws the end of the spindle c¹
out of the slot c', thus enabling the window to be opened, and at the same time
enables the draught preventer to be removed by lifting the arm or bracket e from
the bar or strip p as before described. The bar p is fastened to the bracket e by
means of a small cord or chain attached to hook or ring m on bar p, and to pin / on
bracket e.
When the fastening is closed as in Fig. 3, the bar is held securely by the
metal attachment, which is made with a forked end to take on to the pin or
projecting piece i. From the position of Fig. 3, it can only be moved by means of
the handle or knob c as above described.
Any attempt to force the sashes open surreptitiously from outside the window
will result in pressure on the bar p, which whether of wood or metal will practically
bear any strain brought to bear upon it in that way, such strain being throughout
its length, and being in fact partly taken up by the yielding or flexible tuber, which
serves as a buffer between the sashes a,-b-and bar p. The parts & and e, which serve

page_text: as connecting links to hold the sashes together when the fastening is closed (Fig. 3)
are not subject to a very great amount of strain, and what strain there is upon
them will be that of compression longitudinally so long as the bar or strip p is
allowed to remain in its place.
Fig. 5 shows the same form of fastening as Figs. 3 and 4, but without the draught
excluder p, ..
It is evident the said arrangement of draught-excluder may be
applied with either of the forms of fastening represented in the drawings and herein
described.
In the case of the fastening shown in Figs. 1 and 2, the bar p may have a recess
in its upper surface to allow of the bracket e lying therein.
7"
In that case the parts i and k (Figs. 3 and 4) may if desired be dispensed with,
the parts p and being securely held down upon the sash frame by the pressure of
the said bracket e, and by the same means, prevented from longitudinal or transverse
movement in either direction. The bar p may also be made wider than in Figs. 3
and 4, so as to be held very tightly between the bearings f and straight inner surface
of projection d (Figs. 1 and 2).
By the adoption of my improved arrangement of window fastening, the following
particular advantages are obtained :--
(1.) Risk of the window sashes being opened from outside without working the
fastening, is practically obviated.
(2.) The use of the arrangement for excluding draught between the sashes gives
at the same time additional security to the fastening.
(3.) If required to permit the entrance of fresh air at certain times, a space may
be left between the sashes, such space being closed at other times by the aforesaid
arrangement for excluding draught.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I hereby declare that
what I claim is :-
(1.) In a window fastening, the arm or bracket e with wedge shaped or curved
projection d spring roller g and clip h as shown in Figs. 1 and 2 of the accom-
panying drawings, substantially as hereinbefore described.
(2.) In an arrangement for fastening windows, the employment of the draught
excluder p, r, as shown in Figs. 3 and 4, substantially as hereinbefore described.
(3.) The improved window fastening arrangements substantially as hereinbefore
described and shown in the accompanying drawings.
Dated the 7th day of March 1891.
C. R. BONNE & Co.,
Agents for Applicant.