Improvements in Electrically Propelled Fans.
Year: 1894

page_text: Date of Application, 14th Nov., 1894
Complete Specification Left, 16th Sept., 1895-Accepted, 19th Oct., 1895
PROVISIONAL SPECIFICATION.
Improvements in Electrically Propelled Fans.
We JAMES HENRY PICKUP of Britannia Works Bury in the County of
Lancaster Engineer and JOHN HENRY HINDLE of 46 East Street Bury aforesaid
Electrical Engineer do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in electrically propelled fans in which
the electro motor is mounted directly on the fan shaft and has for its object to
form a compact arrangement of apparatus which may be conveniently used in
confined spaces and generally where mechanical driving is unavailable and without
unduly obstructing the passage for air through the fan.
In carrying out this invention for example with a fan mounted on a shaft or
spindle revolving in socket bearings we employ field magnets and an armature of
any well known type formed either of solid or laminated iron and preferably of
compact construction so as to ensure as little obstruction as is possible to the air
passing to the fan blades. The armature is fast on the fan shaft and the field
magnet surrounds the armature in the ordinary manner. In order to obtain as
small a clearance between the armature and the field magnet as is practicable and
at the same time to ensure mechanical safety of the apparatus by retaining the
relative concentricity of the armature and field magnets we suspend one end of the
field magnet on the shaft carrying the armature and fan blades by means of a
bracket of brass or other metal, the said shaft passing through and rotating in the
said bracket which is suitably lubricated to avoid undue friction the other end of
the said field magnet is mounted on a second bracket secured by means of a set
screw or otherwise to the socket bearing carrying that end of the fan shaft.
Or in place of mounting one of the brackets on the socket bearing of the fan the
bracket may be mounted on the shaft, which is free to rotate in the said bracket,
and since the field magnets will have a tendency to rotate in a direction opposite to
that of the armature, we so construct the field magnets as to engage with the fan
frame say by means of projections on the one taking into recesses on the other so
that the field magnets are rendered stationary and the general efficiency of the
apparatus is secured.
By this means perfect concentricity between the armature and field magnet is
retained in spite of deflection or distortion of the fan frame, brought about for
example by mechanical stresses involved in fixing the same.
Dated this 14th day of November 1894.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.

page_text: 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 electrically propelled fans in which
the electromotor is mounted directly on the fan shaft, and has for its object to
form a compact arrangement of apparatus which may be conveniently used in
confined spaces, and generally where mechanical driving is unavailable, and without
unduly obstructing the passage for air through the fan.
We will describe this invention with reference to the accompanying drawing,
Figure 1 showing, in sectional elevation, a fan constructed in accordance with this
invention, and Fig. 2 being a transverse section on the line 1, 2, Figure 1.
In carrying out this invention, for example with a fan mounted on
a shaft or
spindle A revolving in socket bearings 662 in a carrier, frame, or bracket, B, we
employ field magnets C, and an armature D, of any well known, or suitable, type,
and formed either of solid, or laminated, iron, and preferably of compact
construction, so as to give as little obstruction as is possible to the air passing to the
fan blades E. The armature D is fast on the fan shaft A, and the field magnets C,
surround the armature D, in the ordinary manner. In order to obtain as small a
clearance between the armature and the field magnets as is practicable, and at the
same time to ensure mechanical safety of the apparatus by retaining the relative
concentricity of the armature and field magnets, we suspend one end of the field
magnet on the shaft A, carrying the armature and fan blades by means of a
bracket c, of brass, or other suitable metal, the said shaft A, passing through,
and rotating in, the said bracket c, which is suitably lubricated to avoid undue
friction. The other end of the said field magnets is mounted on a second
bracket c², secured by means of a set screw c³, or otherwise, to the socket bearing b³,
carrying that end of the fan shaft A.
Or in place of mounting one of the brackets on the socket bearing of the fan,
that bracket also may be mounted on the shaft A, which is free to rotate also in the
said bracket, and since the field magnets will have a tendency to rotate in a
direction opposite to that of the armature we so construct, or add to, the field
magnets as to engage it with the frame, say by means of projections, on the one
taking into recesses on the other, so that the field magnets are rendered stationary
and the general efficiency of the apparatus is secured.
By this means perfect concentricity between the armature and field magnet is
retained in spite of deflection, or distortion, of the fan frame, brought about for
example by mechanical stresses, involved in fixing the same, or otherwise.
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. In electrically driven fans an armature secured to a revolving fan shaft, in
combination with field magnets mounted in connection with the said shaft; as
bereinbefore described, so as to ensure concentricity of the armature and field
magnets.
2. An electrically driven fan constructed, or arranged, substantially as herein-
before described, and also as illustrated by the accompanying drawings.
Dated this 16th day of September 1895.