Improvements in Automatic or Self-acting Ventilators.
Year: 1894

page_text: Date of Application; 4th June, 1894
Complete Specification Left, 4th Mar., 1895-Accepted, 6th Apr., 1895
PROVISIONAL SPECIFICATION.
Improvements in Automatic or Self-acting Ventilators.
I, JOHN ROTHWELL of Britannia Works, Farnworth near Bolton in the County
of Lancaster, Consulting and Ventilating Engineer, do hereby declare the nature
of my said invention to be as follows:-
This invention relates to improvements in automatic or self-acting ventilators. and
consists of a metallic or other stationary case of any suitable or desired form
Inside the metallic or other
provided with outlets for vitiated air and the like.
stationary case is mounted in bearings a spindle carrying a propeller. The said
spindle passes through the top of the ventilator and is provided with wind cups or
vanes to rotate the same and the propeller, and may be so disposed that they will
rotate slowly so that their circumferential travel will be less than the circumferential
travel of the propeller. To effect this the arms or spindles carrying the wind cups
or vanes may be of any length and screwed to allow of the latter being fixed to
any desired position.
22 T. 1001
EDMUND CHADWICK, F.I.C.P.A.,
Agent.
Improvements in Automatic or Self-acting Ventilators.
I JOHN ROTHWELL of Britannia Works, Farnworth near Bolton, in the County
of Lancaster, Consulting and Ventilating 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 and accompanying
drawings:-
This invention relates to improvements in automatic or self-acting ventilators
and consists of a metallic or other stationary case of any suitable or desired form
provided with outlets for vitiated air and the like. Inside the metallic or other
stationary case is mounted in bearings a spindle carrying a propeller.
The said spindle passes through the top of the ventilator and is provided with
wind cups or vanes to rotate the shaft and propeller the said cups or vanes being
preferably so disposed that their circumferential travel will be less than the
circumferential travel of the propeller. To effect this the arms or spindles
carrying the wind cups or vanes may be of any length and screwed to allow of the
latter being fixed to any desired position.
To render my invention clearly understood I will now proceed to describe the
same with reference to the annexed sheet of illustrative drawings.
Fig. 1 is an elevation of a ventilator casing furnished with the aforesaid wind
cups or vanes.
Fig. 2 is a horizontal section showing the propeller.
Fig. 3 is a plan in which the said cups or vanes appear.
Fig. 4 is an enlarged view of one of the said cups or vanes showing how the same
may be made adjustable on the supporting arms.

page_text: Fig. 5 shows another modified method of easily adjusting the wind cups or vanes
relatively to the spindle.
The casing a may be of any suitable shape or design and provided in the ordinary
manner with outlets a' for the vitiated air drawn up and expelled by the propeller b.
This propeller may be of any suitable or ordinary shape, and is mounted upon a
revolvable spindle c which is carried in suitable bearings so as to revolve easily.
The spindle c is prolonged above the roof of the casing as clearly shown in Fig. 1
and is furnished with any suitable number (for example 4) of wind cups or vanes d
which are secured to the spindle by means of the arms e. It will be noted that the
circumferential path traversed by the wind cups d is less than the circumference
described by the blade tips of-the-propeller 6 and I prefer this arrangement in
order to gain increased velocity of rotation of the spindle and propeller since it is
evident that with the same speed of wind current the corresponding speed of the
propeller spindle will be governed by the length of the arms which carry the wind
cups or vanes. Therefore due care being taken not to make the arms too short
I find that for the purposes of speeding up the propeller it is advantageous to
reduce the circumferential path of the wind cups as compared with the circumference
of the propeller. I might however make the circumferential path of the cups or
vanes the same as or greater than the circumference of the propeller.
The wind cups or vanes d may be fixed on the ends of the arms e as shown in
Figs. 1 and 3 or they might be made adjustable as shown in Figs. 4 and 5. This
adjustment might be effected in various ways but a convenient method would be, as
shown in Fig. 4, to screw the outer end of each arm e and adjust the cup thereon
by means of jamb nuts e. Another mode would be to provide the back of the wind
cup with a set screw and adjust it by that means.
An easy method of adjusting the cups or vanes d so as to increase or diminish
their circumferential path in accordance with varying wind pressures would be to
mount the said cups or vanes on lazy-tongs ff' as shown in Fig. 5. The levers f
are pivotted to the top of the spindle c and to the cups d and the levers f¹ to a
spindle sliding through the spindle c and capable of being worked from within so
that by pushing up or pulling down the spindle c by any convenient means the cups
or vanes d are pushed out or drawn in, thereby increasing or diminishing their
circumferential path in accordance with the strength of the wind.
The mere method of adjustment of the cups is however no essential part of my
invention so long as they are made adjustable.
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.
:
1. In ventilating apparatus of the indicated description the application to the
propeller spindle of wind cups or vanes carried on arms projecting from the spindle
above the ventilator casing, and acting as drivers to rotate the propeller, or
equivalent means for expelling vitiated air, substantially as described and as
illustrated.
2. In ventilating apparatus of the indicated nature the application of driving
wind cups or vanes to the central spindle carrying the air extracting propeller or
its equivalent the said cups or vanes being preferably arranged to rotate in a
circumferential path which shall be less than the circumference of the propeller or
its equivalent, substantially as described and shown:
3. Rendering the said driving wind cups or vanes adjustable upon their supporting
arms for the purpose and substantially as herein before described and as illustrated
in Figures 4 and 5. i..
Dated this 2nd day of March. 1895.
EDMUND CHADWICK, F.I.C.P.A.,.
80, St. George's Road, Bolton, Agent………