Improvements in Spring or Weight-actuated Blowers or Ventilators.
Year: 1894

page_text: Date of Application, 26th Feb., 1594-Accepted, 31st Mar., 194
COMPLETE SPECIFICATION.
Improvements in Spring or Weight-actuated Blowers or
Ventilators.
1, JOHANN FRANZ of Brüx, Bohemia, in the Empire of Austro-Hungary,
Carpenter 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 present invention relates to a ventilator blower or fan for small localities
and occupations which is driven by spring-power and arranged in such a manner
that the number of revolutions of the ventilator may be varied, as desired, by
means of a brake-device.
Fig. 1 of the accompanying drawings is a front view of the apparatus (the casing
being shown in section) and Fig. 2 is a sectional side-view thereof.
Figs. 3 and 4 represent a modification of the driving-device.
The apparatus is contained in a casing A in which a short tube Cfor the reception
of the fan B is inserted. The tube C fits into an opening formed in the wall and
communicates with the open air. .
In the lower part of the casing are arranged two or more spiral springs (strong
clock-springs) contained in the barrels G which springs F are wound up by means
of a key and are so retained by the pawl r which engages with the ratchet-.
wheel M.
The springs F act on the barrels G and force them to turn whereby the wheels D
which are connected with the latter are set in motion.
As the wheels D engage with the wheel J the latter is turned at the same time,
as is also the chain-wheel a connected with the wheel J, this chain-wheel a in its
turn driving the wheel b by means of a chain. The rotation of the wheel bis
transmitted by multiplying gear c d e f g and h to the vertical shaft i and by the
bevel-gear to the shaft 7 on which the fan B is secured.
1
A brake, consisting of a brake-bar or lever p, one end of which rests on the shaft
of the wheel and through whose other end passes a screw-bolt, is provided for the
purpose for regulating the draught; the fulcrum pin q arranged above and inear
the centre of the lever p'prevents the latter from moving upwards. By turning the
button m the bolt is screwed either in or out of the lever p by which means the
end of the lever resting on the shaft of the wheelf is moved away from this shaft
or pressed tighter against it, so that in the first case the number of revolutions of
the fan (the movement not being checked) is greater, and in the latter case
smaller.
Instead of two springs only one spring or several springs may be used as
motors.
Figs. 3 and 4 show a modification of the driving-mechanism consisting in the
arrangement of two spiral springs which are wound up at the same time, but which
do not come into action together but successively so that when one spring is run
down or unwound the other comes into action and continues to operate the fan
without the spring requiring to be wound up.
If the spring in the barrel G'is wound up, it is energized as the wheel r¹ and
barrel G¹ are loosely mounted on the shaft 4; if after the spring in G' is completely
wound up, the shaft is further turned in the same direction .e. the winding up is
uninterrupted (as shown by arrow 1) then the barrel and spur-wheel rotate
with the shaft and in consequence, as the spur-wheel gears with which is
connected with the shaft 3 and the ratchet-wheel, the spring in the barrel G is
also wound up in the direction of arrow 2. The wheel and barrel G' are also

page_text: connected with each other. The whole mechanism is kept wound up by means of
the ratchet-wheels and pawl s'. When the winding up is finished the pawl
disengaged from the wheel.
The operation is as follows:
is
When the driving-mechanism is wound up, the spring-power in the barrel. G first
comes into action (see Fig. 4 in which two sets of barrels G' and G' are arranged)
and moves by means of the wheels r¹ and the wheel J' which engages with the
latter and rotates the chain-wheel a¹ (see direction by arrow); as the wheel
engages with a wheel similar to and connected with the wheel J', the barrel G' is
thereby turned in the same direction and to the same extent as the wheel so that
the spring power is thereby preserved; if the spring in the barrel G' runs down
first, the barrel G' comes into action and continues to drive the chain-wheel in the
same direction.
Instead of a spring-motor a weight may be used as in the case of clocks and this
without requiring the fan to be altered in any way.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
1. A blowing or ventilating device comprising one or more spiral-springs or
weights which act simultaneously and by multiplying gear cause the rapid rotation
of the fan B substantially as described.
2. The combination with a spring or weight actuated fan of a regulating device
comprising a brake-lever such as p one end of which by means of a bolt n, may be
pressed against or released from one of the rapidly rotating shafts, a pin such as
constituting the fulcrum and preventing the upward movement of the lever. p,
substantially as described and illustrated in the accompanying drawings.
3. In a spring-actuated blowing or ventilating device two spring barrels such
as G G which are simultaneously wound up in such a manner that by turning a
shaft 4 first the one spring or barrel (G¹) and by further turning the said shaft the
other spring or barrel G is wound up, these two springs or barrels coming into
action successively as the rotation of the first spring-barrel (GI) causes the other
barrel (G) and its shaft to turn so that the second barrel G' does not come into
action or turn the ventilating fan until the spring-power of G₁ is exhausted
substantially as described and illustrated in the accompanying drawings.
Dated thie 96th dor of February 1894.
W. P. THOMPSON & BOULT,
Agents for the Applicant.