Improvements in Window Opening and Closing Apparatus for Greenhouses and the like.
Year: 1897

page_text: D
Improvements in Window Opening and Closing Apparatus for
Greenhouses and the like.
We, EDWIN JOHN WOOLLARD, of High Street, Waltham Cross, Ironmonger,
and ARTHUR CHARLES WALKER, of High Street, Cheshunt, Builder, all in the
County of Herts, do hereby declare the nature of this invention to be as follows:-
This invention refers to an arrangement of a lever attached to a shifting fulcrum
or base, and operated through a thrust rod by a horizontal bar for the purpose of
opening or closing the hanging sashes or ventilators of a greenhouse, hot-house,
or conservatory.
The lever has one end attached to a loop, eye, or staple on the sash. The other
end of the lever is pivotted to a thrust rod springing from the horizontal bar and is
pivotted to a clip thereon. A short distance from this end is the guide and
fulcrum, which is in form a small pulley wheel enclosed in a small staple or a
loop formed by turning over the end of the bar. This pulley serves also to
minimise friction. The wheel travels on a curved or bent guide bar of irregular
shape, which passes through the stuple so that it cannot be disconnected therefrom.
The shape of this guide bar corresponds to the travel of the lever, and regulates
its action on the sash. The guide bar is fixed to the frame or seat of the sash or
ventilator.
D
1
0011
L 1007
Improvements in Window Opening and Closing Apparatus for
Greenhouses and the like.
We, EDWIN JOHN WOOLLARD, of High Street, Waltham Cross, Ironmonger,
and ARTHUR CHARLES WALKER, of High Street, Cheshunt, Builder, all in the
County of Herts, 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 refers to an arrangement of a lever attached to a shifting fulcrum
or base and operated through a thrust rod by a horizontal bar for the purpose of of
opening or closing the hanging sashes of a green-house, hot-house, or conservatory.
The lever has one end attached to a loop, eye, or staple ou the sash. The other

page_text: end of the lover is pivotted to a thrust rod springing from the horizontal bar and
pivolted to a clip thereon. A short distance from this end is the guide and
fulcrum which is in the form of a small pulley wheel enclosed in a small staple or a
loop formed by turning over the end of the bar. This pulley serves also to mini-
mise friction.
The wheel travels on a curved or bent guide bar of irregular shape, which passes
through the staple so that it cannot be disconnected therefrom. The shape of
this guide bar corresponds to the travel of the lever, and regulates its action on the
sash. The guide bar is fixed to the frame or seat of the sash or ventilator.
We will now describe the invention with reference to the accompanying draw-
ings in which
Fig. 1 shows a sectional elevation of the roof and side of a greenhouse, with one
sash open and one closed.
Figs. 2 and 3 shew enlarged sectional elevations of one of the sashes shown in
the previous figure, in the open and closed positions.
Figs. 4 and 5, are side and end elevations on an enlarged scale of the roller and
pivot joint at r.
a is the lifting arm, or lever, which serves to raise or lower the sash b. It is
attached at one end to the sash at 6, and at the other end to a draw or thrust
rod c, at c. The draw or thrust rod c is attached at its other end to a clip d, which
embraces a travelling rod e, which constitutes the main operating rod. This latter
may operate any desired number of ventilating sashes at one movement.
Near one end of the arm or lever a, and attached to it is an anti-friction
roller or guide f, which forms a shifting fulcrum to the lever a. This roller f
may be affixed to the lever a in any desired fashion, but preferably as shown in
Figs. 4 and 5, in which the end of the lever is doubled upon itself, to form a loop
to receive the roller.
is a bent or shaped guide bar, upon which the roller f runs, and is firmly
attached at its ends to the sash frame g¹. The guide bar as shown is sloped at one
end so that upon the roller arriving at this part of its travel it raises the lifting
arm a, and thus opens the ventilating sash. Near its other end the barg is provided
with a notch or recess ³, into which the roller f drops at the end of its travel,
that is to say, when the ventilator sash is closed; and this holds it firm against
wind.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what we
claim is:
1
9,
In a gear for opening and closing the ventilating sashes of green-houses and the
like, the combination of the lever a, fitted with roller f, the guide bar thrust
rod c fitted with clip or its equivalent for attaching to operating bar, as herein
described and set forth.
Dated this 1st day of October 1907
8. S. BROMHEAD,
Patent Agent, 171, Queen Victoria Street, London.