Improvements in Air-propellors or Ventilating-fans.
Year: 1890

page_text: Date of Application, 7th Feb., 1890
Complete Specification Left, 7th Nov., 1890-Accepted, 13th Dec., 1890
-PROVISIONAL SPECIFICATION.
Improvements in Air-propellors or Ventilating-fans.
1 WILLIAM SAYER of 144 Uttoxeter New Road Derby in the County of Derby
Engineer do hereby declare the nature of this invention to be as follows:-
By my present invention I desire to provide an improved method of forming the
peripheral tips or ends of the blades or wings described in a former application for
Letters Patent filed by me on the 15th day of October 1889 and numbered 16201.
In the Complete Specification (and drawings attached thereto) following such
application and accepted on the 25th January 1890 I described a blade or wing
having a T shaped peripheral extremity which might be partially cut away on either
side.
Now by present invention instead of forming the peripheral extremities of such
blades or wings of a Ţ shape or at right angles to the blades I cut or divide the plates
forming such blades near to the peripheral ends thereof and bend or form one half in
one direction and the other half in the opposite direction and in a curved line instead
of at a direct right angle thereto or with part of the extremity at right angles to the
blade or plate but joined thereto by a curved portion.
Dated this 6th day of February 1890.
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Air-propellors or Ventilating-fans.
I WILLIAM SAYER of 144 Uttoxeter New Road Derby in the County of Derby
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:
By my present invention I desire to provide an improved method of forming the
peripheral tips or ends of the blades or wings described in the Specification and
drawings referred to in Letters Patent granted to me numbered 16201 and dated
15th October 1889 which said blades or wings have a T shaped peripheral extremity
which might be partially cut away on either side.
Now by my present invention instead of forming the peripheral extremities of such
blades or wings of a T shape or at right angles to the blades I cut or divide the plates
forming such blades near to the peripheral ends thereof and bend or form one half in
one direction and the other half in the opposite direction and in a curved line instead
of at a direct right angle thereto or with part of the extremity at right angles to the
blade or plate but joined thereto by a curved portion.
Referring to the accompanying drawings and to the figures and letters of reference
thereon,
Figure 1 is a front elevation showing the blades or wings in position and
Figure 2 is a cross section through frame on line a-b one blade only of the
propellor being shown.
In these figures A indicates one half of the peripheral extremity divided at D and
bent in one direction and B shows the other. half bent in the opposite direction; C is
the curved portion in each half or section.
It will be understood that more than one division and more than two bent parts or
sections may be employed without departing from the spirit of my invention.

page_text: 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
1. In air propellors ventilating fans and like devices the use of blades or wings
having their peripheral extremities divided or cut into two parts one part being bent
or turned downwardly to the right hand and the other to the left substantially as
described herein and as illustrated by the accompanying drawings.
2. In air propellors ventilating fans and like devices dividing the peripheral
extremities of the blades or wings into parts and bending or forming such parts
downwardly and in alternately different directions substantially as herein described
and as illustrated by the accompanying sheet of drawings.
Dated this 7th day of November 1890.
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C, Agents for the Applicant.