Improvements in Fans or Air Propellors.
Year: 1893

page_text: Date of Application, 6th Jan., 1893
Complete Specification Left, 6th Oct., 1893-Accepted, 9th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Fans or Air Propellors.
I, WILLIAM TATTERSALL, of 90, Arden Terrace, Accrington, in the County
of Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in fans or air propellors and its principal
object is to concentrate or give more uniformity to the direction of the current
produced.
For this purpose in addition to the ordinary screw type of fan blades I employ a
secondary set of blades having a centripetal action and adapted to counteract the
centrifugal action of the screw blades and direct the current approximately parallel
to the axis of the fan. These secondary blades may be placed either to the rear or
in front of the screw blades and be connected thereto at suitable intervals or they
may be arranged alternately therewith.
Dated this 5th day of January 1893.
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Fans or Air Propellors.
I, WILLIAM TATTERSALL, of 90, Arden Terrace, Accrington, in the County
of Lancaster, 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 :-
This invention relates to improvements in fans or air propellors and its object is
to concentrate or give more uniformity to the direction of the current produced as
well as increase its volume.
For this purpose in addition to the ordinary screw type of fan blades I employ a
secondary set of blades having a centripetal action and adapted to counteract the
centrifugal action of the screw blades and direct the current approximately parallel
to the axis of the fan. These secondary blades may be placed either to the rear or
in front of the screw blades and be connected thereto at suitable intervals or they
may be arranged alternately therewith.
Reference is to be had to the accompanying sheet of drawings forming a part of
this Specification in which similar letters of reference indicate corresponding parts
in each of the figures.
Figure 1, represents an elevation of a fan constructed in accordance with my
invention in which the screw blades are represented in front. The bearings for the
central shaft and the framework supporting them are omitted as they are of any
ordinary type.
Figure 2, is a similar elevation of the opposite side of the fan showing the
centripetal blades in full.
Figure 3, is a plan view of Figure 1.
Figures 4 and 5 are views of detail hereinafter referred to.
The screw blades A may be made of any ordinary form and are secured in any
ordinary manner to the boss B on the central driving shaft C.
•
The centripetal blades E are preferably placed immediately to the rear of the
blades A. The inner ends of the blades are secured to the projections F provided
Prica 8d.1

page_text: for that purpose on the boss B and their outer ends are connected to the annular
stay D.
Figures 4 and 5 illustrate the method of securing the blades A by approximately
radial arms or stays C fixed at their inner ends by the screws H to the boss B and
their outer ends are bent inwards and secured to the annular stay D by rivets J.
The blades A are riveted or secured to this stay.
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:
In a fan or air propellor, the combination with blades of the screw type, of blades
having a centripetal action, substantially as herein shown and described, and
illustrated in the accompanying drawings.
Dated this 4th dex of Ontabou 1902
DRACUP & NOWELL,
Bradford, Agents.