Improvements in Electrically Driven Fans or Ventilating Devices.
Year: 1898

page_text: Date of Application, 10th Aug., 1898-Accepted, 24th Sept., 1898
COMPLETE SPECIFICATION.
Improvements in Electrically Driven Fans or Ventilating Devices.
I, SIGMUND BERGMANN, of 572, First Avenue, New York, U.S.A., Electrical
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:
-
This invention relates to an electrically driven fan or ventilator suitable for
use in ventilating rooms and other places, which is so constructed and arranged
that the driving electro-motor is rotated around a vertical axis by the reaction
of the air whereby a second set of vanes is set in motion and a more active
churning of the air is effected.
The invention is illustrated in the accompanying drawings in which
Fig. 1 is an elevation partly in section of a ventilating apparatus mounted
on a pillar.
Fig. 2 shows a side elevation of an apparatus somewhat modified and de-
pending from a ceiling.
The electro-motor which drives the apparatus is enclosed in a casing a and
imparts a rapid rotating motion to the shaft b. Brackets c arranged at the sides
of the casing support arbors d the ends of which are fitted with fans e. The
motion of the shaft is imparted to the arbors d by means of a leather cord f
or the like passing over pulleys f f¹ or by any other suitable device. The reaction
of the air upon the fans e so arranged produces a turning moment which tends
to rotate the whole apparatus around upon the vertical spindle g. The latter
rotates freely on a ball bearing h with a comparatively slow motion due to the
said action of the air, and is provided with a pair of large ventilating wings i
which in their rotation cause a motion of the air in a vertical direction, whilst
the vanese have for object to churn the air in a horizontal direction. A
sliding contact of suitable form permits of the current being supplied to the
electro-motor whilst the spindle is rotating. The motor is provided with a
switching lever by means of which the apparatus can be set in motion or stopped
and its speed varied.
In the arrangement shown in Fig. 1 the horizontal wings are located below
the motor on the spindle g that rests upon the bearing on a pillar k. In the
arrangement shown in Fig. 2, the spindle g extends beyond the lower side of the
motor and is there provided with wings i.
The arrangement is such that on loosening a set screw the large ventilating
wings can be removed. Sometimes only one set of fanning wings e may be used,
in which case the spindle moves more slowly. When fanning wings e are
arranged axially, that is to say attached direct to shaft b, a turning moment
causing the rotation of the motor may be also produced if one half of the fanning
wings be shielded or screened to a certain extent by a casing.
The whole arrangement can be utilised for the purpose of transforming with-
out resorting to the use of toothed gearing the rapid motion of the armature of
a motor into a slower one, which can be taken from the spindle g itself.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed. I declare that what
I claim is:
1. An electrically-driven fan in which the motor that actuates the ventilating
vanese attached to one or both ends of the armature shaft can rotate around a
vertical axis g the said vanes e being located either at the side of the motor and
driven therefrom by intermediate gearing or arranged axially and having a por-
tion screened, so that in either case the motor is turned round the said vertical
axis by the reaction of the air upon the vanes whilst they rapidly revolve sub-
stantially as described and for the purpose set forth.
2. In fanning or ventilating devices of the kind described in the preceding
claim, the arrangement of larger fanning wings on the vertical axis of the
motor which cause a motion of the 'air in a vertical direction whilst the said
motor is rotating, substantially as described and for the purpose set forth.
3. Electrically-driven fan devices constructed arranged and operating sub-
stantially as hereinbefore described with reference to Fig. 1 or modified according
to Fig. 2 of the drawings.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.