Improvements in Fans or Apparatus for Inducing Currents of Air.
Year: 1891

page_text: Date of Application, 4th Mar., 1891
Complete Specification Left, 3rd Dec., 1891-Accepted, 27th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Fans or Apparatus for Inducing Currents of Air.
We, JAMES HENRY PICKUP of Walmersley Road, Bury the County of
Lancaster, Engineer, and JAMES BYROM of Woolfold, Bury, aforesaid, Con-
tractor, and EDWIN DRANSFIELD of Bell Lane, Bury, aforesaid, Engineer, do
hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a fan or apparatus for inducing
currents of air which will act with greater efficiency than do such fans or apparatus
as hitherto constructed. The main part or body of the blades is of any convenient
shape but preferably has its onward or root end in a plane at or about right angles
to the axial line of the shaft of the fan the blade having a curvature increasing as
it approaches the circumference and the leaving edge. The leaving edge of each
blade as it approaches the circumference is set more and more back from the
entering edge of the adjacent blade and this entering edge is formed with or has
attached to it a portion which overlaps to some extent at the inward part of the
blade the face of the adjacent blade and preferably projects from the face of the
entering edge. This portion so overlapping or overlapping and projecting may be
angled from the main part of the blade or may be made to merge thereinto by a
curve and it preferably is of increasing width or extent of projection from the
blade as it approaches the axis. The blades may be strengthened by a ring or
rings secured to the circumferential parts of the blades.
Dated this 4th day of March 1891.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
COMPLETE SPECIFICATION.
Improvements in Fans or Apparatus for Inducing Currents of Air.
We JAMES HENRY PICKUP of Walmersley Road Bury in the County of
Lancaster Engineer, JAMES BYROM of Woolfold Bury aforesaid Contractor and
EDWIN DRANSFIELD of Bell Lane Bury aforesaid Engineer do hereby declare
the nature of our said invention and in what manner the same is to be performed
to be particularly described and ascertained in and by the following state-
ment:
The object of this invention is to provide a fan or apparatus for inducing
currents of air which will act with greater efficiency than do such fans or apparatus
as hitherto constructed. The main part or body of the blades is of any convenient
shape but preferably has its inward or root end in a plane at or about right angles
to the axial line of the shaft of the fan the blade having a curvature increasing as
it approaches the circumference and the leaving edge.
The leaving edge of cach blade as it approaches the circumference is set more
and more back from the entering edge of the adjacent blade and this entering edge
is formed with or has attached to it a portion which overlaps to some extent at the
inward part of the blade the face of the adjacent blade, and preferably projects
from the face of the entering edge. This portion so overlapping or overlapping
and projecting may be angled from the main part of the blade or may be made to
merge thereinto by a curve and it preferably is of increasing width or extent of
projection from the blade as it approaches the axis.
The blades may be strengthened by a ring or rings secured to the circumferential
parts of the blades.

page_text: Figure 1 of the accompanying drawing is a front elevation and Figure 2 an edge
view of a fan made according to this invention in the form we consider best in
practice.
.
Each blade has its root end a at or about right angles to the axial line of the
fan and has a curvature increasing as it approaches the circumference and the
leaving edge c. The said leaving edge as it approaches the circumference is set
more and more back from the entering edge d of the adjacent blade and the said
entering edge is provided with a part projecting from the face of the entering
edge and overlapping the inward part of the face of the adjacent blade.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. A fan or apparatus for inducing currents of air having the leaving edges of
the blades set back from the entering edges the said entering edges being provided
with a portion which overlaps the face of the adjacent blade substantially as herein-
before explained.
2. A fan or apparatus for inducing currents of air having blades constructed
and relatively arranged as hereinbefore described and shewn in the accompanying
drawing.
Dated this 3rd day of December 1891.
J. H. JOHNSON & Co.,
Agents.