An Improvement in Blast-fans.
Year: 1890

page_text: Date of Application, 5th June, 1890
Complete Specification Left, 4th Mar., 1891-Accepted, 4th Apr., 1891
PROVISIONAL SPECIFICATION.
An Improvement in Blast-fans.
GIOVANNI COSTANTE PARINI, 156, Dale Street, Liverpool, Restaurant
Keeper, do hereby declare the nature of this invention to be as follows:-
The construction of fan will be exactly the same as regards case, the blades
however will be different projecting outside case at both sides & flanged on edges,
with a dividing piece in centre, they will all be cast in one piece with three or
more blades as required. The blades will fill the case inside only enough space
being left for clearance; its simplicity in construction being one of its advantages,
together with obtaining far more blast than in present fans with the same
power used.
Dated this Eleventh day of July 1890.
GIOVANNI COSTANTE PARINI.
COMPLETE SPECIFICATION.
An Improvement in Blast-fans.
I, GIOVANNI COSTANTE PARINI, of 156, Dale Street, Liverpool, Restaurant
Keeper, 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 construction of fan will be exactly the same as regards the case as in an
ordinary blast fan, the blades however will be different, projecting outside the case
at both sides and flanged on their edges with a dividing piece in the centre, they
can either be cast in one piece or constructed of sheet iron or other suitable metal
or material with three or more blades as required. The blades will fill the case
inside, only enough space being left for clearance; its simplicity in construction
being one of its advantages together with obtaining far more blast than in the
present fans with the same power used.
Having thus generally described the nature, object and effects of the invention
I will now proceed to describe it with reference to the accompanying sheets of
drawings which are marked with letters and figures of reference corresponding to
those used in the following explanation, like letters and figures being used to denote
the same or corresponding parts throughout the various views.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is an elevation partly in section of a three bladed blast-fan and case
provided with the improvements according to my invention.
Figure 2 is a plan of the blast-fan and case illustrated at Figure 1, shewn partly
in section.
Figure 3 is an elevation shewn partly in section of a modified form of blast-fan
and case, with the improvements according to my invention.
Figure 4 is an outside elevation of the fan case shewn in Figure 3.
With reference to the drawings a designates the fan case, and the fan. The
construction of the fan case a, shewn in Figures 1 and 2, is exactly the same as an
ordinary fan-case. The fan is constructed with the sides c of its blades & flanged
out, and at the centre e projecting outside the case at both sides, and with a web
or feather in the centre; round the centre of the fan, where it projects through
the case, there is provided a ring which encircles the suction opening of the fan

page_text: casc a.
for clearance.
The blades d are of sufficient size to fill the case inside, space being left
The construction of fan shewn in Figure 3 is much the same as that shewn in
Figures 1 and 2, but it has four blades, and the centre part e is made to project
further through the suction openings of the case a, and the flange c is continued
onto the centre part of the blades, and the metal of the suction openings i is
turned in all round to encircle the blades d, the ring being, in this case, dispensed
with.
By constructing the blades d with their sides e flanged out at their centre part e
projecting through the suction opening i, I obtain a much better result than is
obtained by fans constructed in the present form with straight blades and not
.projecting through the suction openings at their centre. And by constructing
the edge of the suction opening of the case to turn in round the centre of the blades,
as shewn in Figure 3, a silent action of the fan is ensured.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is -
1. The improvements substantially as herein described, in blast fans, consisting
in constructing the blades of the fan with the centre portion immediately adjoining
the boss projecting outside the suction openings of the case, and providing the said
blades with side flanges, and a centre web, as set forth.
2. In a blast-fan such as herein described, providing the blades thereof with
side flanges, as set forth.
3. In a blast-fan such as herein described, providing the blades thereof with
sides flanges and a ring encircling the suction opening of the fan case as set
forth.
4. In a blast-fan such as herein described, constructing the centre portion of the
blades to project through the suction opening, with a flange on the portion so pro-
jecting and turning in the edge of the suction openings round the flanges of the
blades, as set forth.
5. The blast-fan and case constructed substantially as set forth with reference to
Figures 1 and 2 of the drawings.
6. The blast-fan and case constructed substantially as set forth with reference to
Figures 3 and 4 of the drawings.
Dated this 3rd day of March 1891
CHEESBROUGH & ROYSTON,
15, Water Street, Liverpool, Applicant's Patent Agents.