An Improved Ventilating or Blowing Far.
Year: 1890

page_text: Date of Application, 12th Nov., 1890-Accepted. 13th Dec
1800
5
COMPLETE SPECIFICATION.
An Improved Ventilating or Blowing Far.
I, GEORGE BARNETT of 4 James Armitage Street, Cornhill, Southwick, Sunderland,
in the County of Durham, Landlord, 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 refers to an improved ventilating or blowing fan and consists in a
novel arrangement or disposition of parts forming chambers through which air is
caused to circulate prior to its exit from the machine.
I will describe my invention with reference to the accompanying drawings in
which Fig. 1 is a side view the right hand portion of this fig. showing the fan
uncovered that is to say a portion of the fan casing is for the sake of clearness
removed, while the left hand portion shows the fan and casing in side elevation. The
right hand portion of Fig. 2 shows a cross section through the fan and casing, the left
hand portion of this fig. showing the fan and casing in end elevation. Fig. 3 is an
half plan of the fan itself.
Referring to these figs. it will be seen that the fan consists essentially of three
chambers abc of which a and c form the air-entry chambers at either side and forms
the central or exit chamber. On the shaft d the fan blades are mounted in any
suitable and workmanlike manner.
the fan is shown arranged with six lateral blades while the central chamber is shown
In the figs. each lateral chamber or division of
with four central blades e the extremities e of which pass somewhat beyond the
extremities of the lateral blades but the number of the blades as well as their form may
be varied as required according to circumstances. The tips of the central blades
revolve in an extension or central channel h of the casing ¹. The blades e e¹ may be
straight or partially curved.
The air enters the fan on both sides through the ports p in the sides of the casing
whence it passes through the triangular shaped passages or ports formed by the convex
backs and concave interiors i of the lateral blades to the centre of the machine whence
it is ejected by the blades e e¹ through the outlet o.
as a storage chamber which in running is continually supplied with air from both sides
The centre of the fan thus acts
of the fan, whence it is ejected with great velocity and useful effect through the
exit port o.
The fan may be driven direct or by belt or wheel or friction gearing either by hand,
team or other power according to the dimensions and capacities of each individual
machine but where wheel gearing is employed I find that an india rubber tyre on the
riving gear assists greatly in diminishing the noise due to the running of the fan and
ts gear.
The fan shaft bearings may be arranged in any convenient position either and
referably wholly outside the casing or upon pedestals built thereon or secured
hereto.
The edges of the lateral blades may either be angular as shown in the drawings
rounded off as desired.
The casing is arranged to fit in close proximity to the fan itself. It may be
nstructed in pieces and bolted together around the fan.
For smith's fires and the like purposes, the outlet o may be extended to form an
ifice with an adjustable terminal nozzle for renewal when worn out.
Having now particularly described and ascertained the nature of my said inven-
n and in what manner the same is to be performed I declare that what I
im is
1. A centrifugal fan having a central chamber for central power and expulsion
[Pric

page_text: blades e e and lateral chambers for lateral air-inlet blades the blades and chambers
and casing being arranged and adapted for working substantially as herein set forth.
2. The arrangement or combination of parts constituting the improved ventilating
or blowing fan arranged and working substantially as herein set forth.
Dated this 11th day of November 1890.
A. CRAWHALL CHAPMAN,
3, St. Nicholas' Buildings, Newcastle-on-Tyne, Patent Agent for Applicant.