An Improved Means or Apparatus for Operating the Ventilating Ridges of Greenhouses and the like.
Year: 1891

page_text: Date of Application, 21st July, 1891
Complete Specification Left, 20th May, 1892-Accepted, 25th June, 1892
PROVISIONAL SPECIFICATION.
An Improved Means or Apparatus for Operating the Ventilating
Ridges of Greenhouses and the like.
I, GEORGE WILLIAM WOOD, Sadler Gate, Derby, in the County of Derby,
Horticultural Builder, do hereby declare the nature of this invention to be as
follows:-
My invention is specially designed for operating the ventilating ridges of
greenhouses and the like in which the said ridge fits over the top rails of the
inclined sashes forming the roof of the greenhouse.
In carrying out my invention I fix brackets to the said top rails to which I
pivot a bell crank lever one arm of which is forked, the said forks being pivotted
or jointed to a bracket on the underside of the ventilating ridge, from this bracket
running at right angles to it and in the direction of the length of the ridge extend
arms carrying at the end over the bell crank lever a toothed quadrant or rack free
to move between the before mentioned forks of the lever and engage with a tooth,
projection or edge on the said lever as the mechanism is operated. At the end of
the other arm is carried a pulley round which passes a cord or other device
attached to the outer end of the toothed quadrant or rack. The mechanism is
operated as follows:-The longer arm of the forked bell-crank lever is pulled
down by any suitable means thus raising the fork and with it the ventilating ridge,
the teeth on the quadrant or rack engage with the tooth, projection or edge on the
lever and secure it in any desired position. To close the ridge the cord attached
to the end of the quadrant or rack is pulled raising the said quadrant or rack and
allowing the ridge to be lowered. It is evident that by these means the ventilation
may be regulated as desired.
A lug or stop is cast on the side bracket, fixed to the top rail of the inclined
sash, to prevent the forked arm of the lever being pulled past the vertical.
Dated this 20th day of July 1891.
GEORGE WILLIAM WOOD,
Applicant.
COMPLETE SPECIFICATION.
An Improved Means or Apparatus for Operating the Ventilating
Ridges of Greenhouses and the like.
I, GEORGE WILLIAM WOOD, of Sadler Gate, Derby in the County of Derby,
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 :-
My invention is specially designed for operating the ventilating ridges of
greenhouses and the like in which the inclined sides of the said ridges fit over the
top rails of the inclined sashes forming the roofs of the greenhouses and in order
that my invention may be more readily understood I have caused to be annexed to
this Specification the accompanying sheet of drawings to the figures and letters
of reference marked thereon I now refer.
Figure 1 is a cross section on line a. ""a" of Figure 2.
Figure 2 is a longitudinal section on line "b." "6" of Figure 1.
In carrying out my invention I fix brackets C to the said top rails B of the
inclined sashes forming the roof of the greenhouse and to these brackets I pivot
a bell crank lever D one arm of which is forked the said forks E, E being pivotted

page_text: or jointed at F, F to a bracket G on the under side of the inclined sides A A
of the ridge, from this arms extend both ways running at right angles thereto and
in the direction of the length of the ridge and carrying at one end a toothed quadrant
or rack H free to move between the forks and engage with a tooth, projection or
edge 1 on the bell crank lever as the mechanism is operated, the end of the other
arm carries a pulley J round which passes a cord K or other device attached to the
outer end L of the toothed quadrant. The mechanism is operated as follows:-
The longer arm M of the bell crank lever is pulled down by any suitable means
such as by a rod N thus raising the fork and with it the ventilating ridge, the
teeth on the quadrant engaging with the tooth, projection or edge on the bell
crank lever and securing it in any desired position; to close the ridge the cord K
attached to the end L of the quadrant or rack H is pulled raising the said quadrant
or rack and allowing the ridge to be lowered. It is evident that by these means
the ventilation may be regulated at will. A lug or projection O is cast on one of
the side brackets C to prevent the forked arm of the lever being pulled past the
vertical.
In the accompanying drawings the ridge is shewn raised to its full extent, when
closed it assumes the position shewn by dotted lines on Figure 1.
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 :-
The improved apparatus or mechanism for operating the ventilating ridges of
greenhouses and the like substantially as herein described and illustrated by the
accompanying sheet of drawings.
1041 1 M.... 1900
W. SWINDELL,
Agent for the Applicant.