Improvements in, or connected with, Apparatus for Propelling Fans, or other Machines, or Appliances by Means of Electricity
Year: 1896

page_text: Date of Application, 28th Dec., 1896
Complete Specification Left, 28th Sept., 1897-Accepted, 18th Dec., 1897
PROVISIONAL SPECIFICATION..
"Improvements in, or connected with, Apparatus for Propelling
Fans, or other Machines, or Appliances by Means of Electricity."
We, JAMES HENRY PICKUP, Engineer WILLIAM OSWALD PICKUP, Engineer, THOMAS
HENRY ASHWORTH, Engineer and RICHARD MCCLELLAN, Electrician all of Britannia
Works, Bury in the County of Laucaster do hereby declare the nature of this Invention
to be as follows:-
Our Invention relates to apparatus for propelling fans, or other machines or appliances
by means of electricity, and is more especially designed with a view to operating fans
by means of electricity but is also applicable to driving electrical motors for other
purposes.
The main object of the Invention is to provide means whereby alternating current
machines can be employed for the driving of such fans or other apparatus.
For the purpose of description we will presume that it is a fan that is to be driven.
The fan blades may be situated within a ring armature after the manner described
in the Specification of Letters Patent No. 9850 dated the 24th May 1892, but with a
field having a number of pairs of poles (preferably three or four pairs).
It is we find in practice unnecessary to provide these field magnets with pole pieces
having lips extending for some considerable distance around the armature and with
windings in series with the brushes which convey the current to the commutator of
the fan motor, the connection with the said brushes being in this case made direct
from the alternating current machine and the field magnets having a number of
pairs of poles and then we find that an alternating current can be directly employed
as described for efficiently driving the fan.
The number of pairs of pole pieces on the armature is somewhat in excess of that
on the field magnets so that the armature always has a lead and cannot stop on a
dead point.
The dispensing with the windings on the field magnets may also be applied to
machines which are operated from continuous current generators.
In either case we preferably connect the strips on the commutator through the
armature to a strip one third further round the commutator when three pairs of poles
are used in the field magnets and when other number of pairs of poles are used on
the said magnets the lead, or distance between the commutator strips to which
connection is made through the armature, is correspondingly proportionate.
Dated this 28th day of December 1896
JOHNSONS & WILLCOX
47 Lincolns Inn Fields. London: W.C. Agents.

page_text: "Improvements in, or connected with, Apparatus for Propelling
Fans, or other Machines, or Appliances by Means of Electricity."
We, JAMES HENRY PICKUP, Engineer WILLIAM OSWALD PICKUP, Engineer, THOMAS
HENRY ASHWORTH, Engineer and RICHARD MCCLELLAN, Electrician all of Britannia
Works, Bury in the County of Lancaster, 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 :-
Our Invention relates to apparatus for propelling fans, or other machines or
appliances, by means of electricity and is more especially designed with a view to
operating fans by means of electricity but is also applicable to driving electrical
motors for other purposes. The main object of the invention is to provide means
whereby alternating current machines can be employed for the driving of such fans
or other apparatus.
For the purpose of description we will refer to the accompanying drawing
Figures 1 and 2 of which represent in front elevation and transverse section
respectively a fan driven by electricity according to our invention. The fan blades a
are shewn as being situated within a ring armature b after the manner described in
the Specification of Letters Patent No. 9850 dated the 24th May 1892; but with a
field having a number of pairs of poles c preferably three or four pairs and made
either solid or built up from laminations as may be desired.
We have found in practice that it is unnecessary to provide these field magnets
with pole pieces having lips extending for any considerable distance around the
armature.
The windings may be in series or parallel as required with the brushes.d which
convey the current to the commutator 6 of the fan motor. The connection with the
said brushes being made direct from the alternating current machine, and the field
magnets having a number of pairs of poles, we find that an alternating current can be
directly employed as described for efficiently driving the fan.
The number of pole pieces on the armature should be somewhat in excess of the
number of pairs on the field magnets so that the armature always has a lead and
cannot stop on a dead point.
The windings on the field magnets may be dispensed with in the fan and also in
other machines which are operated from continuous current generators.
We preferably connect the strips on the commutator through the armature each to
a strip situated one third further round the commutator, as shewn in dotted lines;
this applying of course when three pairs of poles are used in the field magnets, and
when other number of pairs of poles are used on the said magnets, the lead, or
distance between the commutator strips to which connection is made through-the
armature is correspondingly proportionate: .
Having now particularly described and, ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
Apparatus for electrically propelling fans or other machines or appliances by an
alternating current machine combined therewith substantially as hereinbefore
described.
Dated this 28th day of September 1897.
JOHNSONS & WILLCOX
47 Lincoln's Inn Fields, London, W.C. Agents.