Improved Ventilating Gear for all kinds of Glass-houses and Nursery Work.
Year: 1892

page_text: Date of Application, 7th Jan., 1892
Complete Specification Left, 7th Oct., 1892-Accepted, 12th Nov., 1892
'PROVISIONAL SPECIFICATION.
Improved Ventilating Gear for all kinds of Glass-houses and
Nursery Work.
I, MARK MACER Smith Wheelwright and Horticultural Builder Enfield
Highway Middlesex, do hereby declare the nature of this invention to be as
follows:-
This ventilation will be made of part iron and part brass and one rod to pass
through the top of the house from end to end with a lifting rod, chain and pulley
to each light and worked by an endless chain in two pullies, with a cranked handle.
The working motion can be fixed inside or outside of the house & it will lift two
sides of the lights at one time, or it will lift one side or the other as may be
required, and will be wind fast when shut.
3000
MARK MACER,
Fredk. Walker, M.S.E.,
Applicant.
Engineer, Registered Patent Agent,
11, Furnival Street, Holborn, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improved Ventilating Gear for all kinds of Glass-houses and
Nursery Work.
1, MARK MACER, of Enfield Highway, in the County of Middlesex, Smith
Wheelwright and Horticultural Builder, 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 to enable the ventilators of greenhouses and other
glazed structures to be easily opened and closed and to prevent the said ventilators
from being lifted by the wind when closed.
In the accompanying sheet of drawings,
Figure 1 represents a section of a greenhouse roof fitted with ventilators, opened,
closed, and fastened by apparatus constructed according to this invention shewing
the ventilators open.
Figure 2 section of same with ventilators closed and fastened.
Figure 3 shews one ventilator closed and one open.
Similar letters denote the same parts in all the figures.
Now according to my invention I provide a shaft a revolving in bearings b
attached the frame c the shaft a extends the whole length of the house has keyed or
otherwise secured thereto a pulley d connected by means of an endless band cord or
chain e to another pulley rotated by the crank handle g.
hh are ventilators to which are pivoted catch levers ii, the catch ; on which
when the ventilators are shut engages with another catch k attached to the frame c.
The shaft a has attached thereto preferably by means of loose collars having an
eye or staple thereon which collars may be secured to the shaft so as to rotate
therewith by means of keys or set screws, a cord chain or chains / which passes
over guide pulleys m, m and is attached to the end of the levers i i.
When the ventilators are to be opened the crank handle g is rotated causing the
shaft a to rotate and wind up the cord, chain, or chains thereon the first effect of
which is to raise the levers i into the position shewn in Figure 1 thereby

page_text: disengaging the catches j and k and the further rotation of the shaft raises the
ventilators. When the ventilators are lowered the weight of the levers ii causes
them to assume the position shewn in Figure 2 automatically securing the venti-
lators from being lifted by the wind.
Figure 3 shews an arrangement by which one ventilator is closed when the other
is opened this is effected by attaching the cord or chain to the shaft a in such a
manner that the portion attached to one lever is wound up while the portion
attached to the other lever is unwound sufficient length of cord or chain being
used to allow both ventilators to be closed at one time.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that
what I claim is :-
1st. In an apparatus for raising and lowering the ventilators of glass-houses
and other structures the catch rods i pivoted to the ventilators substantially as
and for the purposes specified.
2nd. In an apparatus for raising and lowering the ventilators of glass houses and
other structures the rotating shaft a in combination with the catch levers i, i,
and the cord chain or chains all substantially as described and shewn and operating
in the manner specified.
Dated this 7th day of October 1892.
FRED. WALKER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.