Improvements in Air Propellers or Ventilating Fans.
Year: 1893

page_text: Date of Application, 16th May, 1893
Complete Specification Left, 12th Feb., 1894-Accepted, 28th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in Air Propellers or Ventilating Fans.
We, SAMUEL STANDRING of Wakefield Road Dewsbury, and WILLIAM
HOWGATE of Bradford Road Batley, both of the Firm of Standring and
Howgate Providence Works, Batley, all in the County of York, Machine Makers
do hereby declare the nature of this invention to be as follows:-
The object of our present invention is to form the blades of air propellers or
ventilating fans, for ventilating buildings or ships, or for removing air, vapour,.
smoke, fumes, floating dust, gases, &c. so that a greater volume can be removed
with less driving power than is the case with air propellers or ventilating fans of
ordinary make.
To attain this we cut a piece of sheet metal almost in the shape of a sector of
a circle. This is then forged or pressed or by any other convenient means forced
hollow in the centre towards the edge in the form of a spoon excepting the narrow
end which connects to the spindle or shaft, the deepest hollow of the spoon shape
been about three fourths of the length from the narrow end nearest the spindle or
shaft. By this means the blades have a better grip of the air with less slippage
and will remove a greater volume of air with less driving power than is the case
with air propellers or ventilating fans having blades constructed in the ordinary
manner.
When we think it better for the working of the air propeller or ventilating fan,.
to do so we may fix one or more (as we think most proper according to the size of
the blades) strips of sheet metal from side to side of the blades, and standing edge
ways or perpendicular from the blades, this been a great means of further
preventing the slippage of air to the ends of the blades.
By constructing the blades of air propellers or ventilating fans in the manner
above described, all air, floating dust, vapour, smoke gases, fumes, odours, &c.
when once within the grip of the blades will be forced forwards in the direction
required and cannot slip back again as is the case in many air propellers and
ventilating fans of ordinary construction.
SAMUEL STANDRING.
WILLIAM HOWGATE.
COMPLETE SPECIFICATION.
Improvements in Air Propellers or Ventilating Fans.
We SAMUEL STANDRING of Wakefield Road Dewsbury and WILLIAM
HOWGATE of Bradford Road Batley, of the Firm of Standring and Howgate
Providence Works Batley all in the County of York, Machine Makers 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 object of our present invention is to form the blades of air propellers or
ventilating screw fans for ventilating buildings or ships or for removing air,
vapour, smoke, fumes, floating dust, gases &c. so that a greater volume can be
removed with less driving power than is the case with air propellers or ventilating
screw fans of ordinary make.

page_text: To attain this we cut a piece of sheet metal almost in the shape of a sector of a
circle as shown in Fig. 1 of accompanying drawings. This is then forged or
pressed or by any other convenient means forced hollow in the centre towards the
edge almost in the form of a spoon excepting the narrow end which connects to
the spindle or shaft, the deepest hollow of the spoon shape been about three
fourths of the length of the blade from the narrow end nearest the spindle or
shaft.
Figs. 2 & 3 show sections accross Fig. 1 at A A & B. B after the blade has been
hollowed as described.
By this means the blades have a better grip of the air with less slippage, and
will remove a greater volume of air with less driving power than air propellers or
ventilating screw fans of ordinary make.
We may also fix one or more (according to the size of blades &c.) strips of
metal from side to side of the blade, upon the hollow or propelling face and standing
edgeways or perpendicular from the blade this been a great means of further
preventing the slippage of air off the end of the blade.
Fig. 4 shows plan of blade with two strips C. D accross as described. Fig. 51
shows section of Fig. 4 at A. A.
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
1st. The construction of air propellers or ventilating screw fans having their
blades formed to the shape as shown by Figs. 1. 2. & 3 of accompanying
drawings.
2nd. The attachment of strips of metal from side to side on the hollow or
propelling face of the blades of air propellers or ventilating screw fans as described,
and shown by Figs. 4 & 5 of accompanying drawings.
Dated this 10th day of February 1894.
SAML. STANDRING.
WILLIAM HOWGATE.