VENTILATING APPARATUS
Year: 1884

page_text: I, WILLIAM LLOYD WISE, of N° 46 Lincoln's Inn Fields, in the County of
Middlesex, Consulting Engineer, and Patent Agent, do hereby declare the nature of
said invention for "VENTILATING APPARATUS to be as follows:-
The object of the present invention is to provide a noiseless ventilating apparatus
which will be hereinafter described with reference to the accompanying drawings
but it is obvious that the form and the details of the apparatus may be varied
without departing from the invention.
In the accompanying drawings:
Fig 1 is a vertical section.
Fig 2 an elevation, and
Fig 3 a horizontal section of the ventilator.
The other figures of the drawing show details of the same.
The ventilator comprises two side frames A, A. fitted to a foundation plate and
held together by two stay bolts C. C, at the lower part and by a cast iron girder T
at the top.
The lower stay bolts C. C are turned and one of them carries the chain guide
roller or sheave k which is free to slide to and fro upon the said bolt. The chain
or rope passes from this sheave to a second sheave k¹, provided with flanges for the
purpose of guiding the chain or rope to which the driving weight is attached.
In the said side frames the bearings for the first motion wheel 1 and for the first
motion pinion are fitted, these bearings may be simply bored in the frames. The
first motion pinion 2 is not keyed on to the spindle but is driven by pawls which
are fitted in a box cast for them in the boss of the same.
The object of this is to relieve the first motion pinion of the fan during the
winding up.
The first motion wheel and pinion are ordinary spur wheels and require to be of
very fine pitch.
The second motion wheel consists of a light cast iron pulley and is fitted on the
sole or circumference with a ring of vulcanized india-rubber as shown in detail in
Figs 8 and 9. This ring is provided with circumferential ribs of which there are

page_text: shown four although there may be more or less of them. This wheel drives the
second motion pinion 4 by friction and consequently without any noise. The
second motion pinion is of wood or iron and is ribbed like the second motion
wheel 3.
The bearings of the spindle of the pinion 4, and of the third motion wheel 5 are
merely indicated in Figs 1 and 2 and are shown in detail in Figs 10, 11, and 12.
They consist of a box cast on the frame to carry the wearing parts and to ensure
the proper amount of pressure requisite for driving, the bearings are adjusted by
means of a screw key with double nuts.
The third motion wheel 5 and pinion 6 are the same as the second except being
keyed on to the spindle in the usual way.
The spindle of the third motion pinion 6 carries a bevel wheel 7 which is
constructed in the same way as the second motion wheel with the exception that
the face of the same need not necessarily be ribbed; this wheel drives its pinion 8
also by friction (4th motion).
This 4th motion spindle carries the fan W which is driven by this train of wheels.
This spindle runs in a step in the girder and also in a bearing carried by the same,
and is also carried above the fan where it runs in a cone. At the top of the side
frames a flange is cast on to carry the two light columns or supports S for the
ring R, which carries the fan W.
Taking into consideration that the work of the fan is not subject to any
considerable variation when in operation the apparatus is provided with a light
regulating brake B which consists of india rubber rings and iron washers placed
alternately on a tube constructed to receive them. In Fig 1 this brake is merely
indicated in Figs 13, 14, & 15 it is shown in detail.
The shaft w is formed with a collar above its bearing; above the said collar the
sbaft is made to pass through a tuber which carries the india rubber rings and
iron washers m. These rings and washers are held together by two rods a but so
that they still may be compressed. To the top ring a lever h is secured one end of
which is provided with a toothed are into which gears a wheel so that the lever may
be easily pressed down. This detail however can be varied according to the
requirements. 8. 8. are two guide pins. When the lever is pressed down, the
tuber comes against the collar of the spindle w and presses the same against the
bearing so as to operate as a brake.
Lest anything unforeseen should happen to the friction wheels there is provided a
Belf acting brake B¹ on the shaft of the first motion pinion to prevent the weight
from falling. This brake consists of a small pulley keyed to the said shaft (Figs 4,
5, 6 and 7). The said pulley is fitted on one side with a hammer H held in position
by a light spring and a bolt on which it can run in and out.
During ordinary working the centrifugal force of the hammer is almost nil, but
in case the friction wheels should not bite, the centrifugal force of the hammer
would increase considerably and overcome the slight pressure of the spring. The
hammer then flies out to the length allowed by the bolt and strikes the trigger D
which carries the lever and brings the brake B¹ immediately into action and stops
the weight. G is a counter weight balancing the weight of the hammer H.
The apparatus being small it can be placed in any locality even where space is
valuable; it is also possible to put the weight outside of the locality where the fan
is used, when this is desired.

page_text: Fig 3 a horizontal section of the ventilator.
The other figures of the drawings show details of the same.
The ventilator comprises two side frames A A fitted to a foundation plate and
held together by three stay bolts C, C at the lower part and by a girder T at
the top.
In the said side frames the bearings for the first motion wheel 1 and for the first
motion pinion are fitted; these bearings may be simply bored in the frames A, or
the shaft may run between centres as shown.
The first motion pinion 2 is not keyed on to the spindle but is driven by pawls
which are fitted in a box cast for them in the boss of the same pinion. The object
of this is to relieve the first motion pinion of the fan during the winding up.
The winding up of the weight Q which drives the whole apparatus is effected by
means of a crank which is placed upon the square head d of a winding shaft and
by the gear e, f.
The first motion wheel and pinion are ordinary spur wheels and require to be of
very fine pitch.
The second motion wheel consists of a light metal pulley and is fitted on the
rim or circumference with a ring of vulcanized indiarubber as shewn in detail in
Figs 8 and 9. This ring is provided with circumferential ribs of which there are
shown four although there may be more or less of them. This wheel drives the
second motion pinion 4 by friction and consequently without any noise. The
second motion pinion is of wood or metal and is ribbed like the second motion
wheel 3. The bearings of these shafts must be accurately adjustable, to this end
they may be carried between centres mounted on screws (Fig 1) by which the said
centres may be moved sideways so that the shafts may be made to approach
towards or recede from one another.
The third motion wheel 5 and pinion 6 are the same as the second except that
they are keyed on to the spindle in the usual way. The spindle of the third
motion pinion 6 carries a bevel wheel 7 which is constructed in the same way as

page_text: the second motion wheel with the exception that the face need not necessarily be
ribbed, this wheel drives its pinion 8 also by friction (4th motion).
This 4th motion spindle carries the fan W which is driven by this train of wheels.
This spindle runs in a step in the girder T and also in a bearing in the same and is
also carried above the fan where it runs in a cone. At the top of the side frames
a flange is cast on to carry the two light columns or supports S for the ring R
which carries the fan W.
Taking into consideration that the work of the fan is not subject to any
considerable variation when in action I have provided the apparatus with a light
regulating brake B which consists of india-rubber rings and iron washers placed
alternately on a tube constructed to receive them.
In Fig 1 this brake is merely indicated; in figs 10, 11 and 12 it is shown in
detail.
The shaft w is formed with a collar above its bearing; above the said collar the
shaft is made to pass through a tuber which carries the india-rubber rings and
iron washers m. These rings and washers are held together by two rods z but
these are so arranged that the washers may be compressed. To the top ring, a
lever his secured one end of which is provided with a toothed arc into which gears
a wheel so that the lever may be easily pressed down. This detail however can be
varied according to the requirements, 8, 8 are two guide pins. When the lever is
pressed down, the tuber comes against the collar of the spindle w and presses the
same against the bearing so as to operate as a brake. In case that anything
unforeseen should happen to the friction wheels I have provided a selfacting brake B¹
on the shaft of the first motion pinion, to prevent the weight from falling. This
brake consists of a small pulley keyed to the said shaft (Figs 4, 5, 6 and 7). The
said pulley is fitted on one side with a hammer H held in position by a light
spring and a bolt on which it can run in and out. During ordinary working the
centrifugal force of the hammer is almost nil but in case the friction wheels should
not bite the centrifugal force of the hammer would increase considerably and
overcome the slight pressure of the spring. The hammer then flies out to the
length allowed by the bolt and strikes the trigger D which supports the brake
lever and brings the brake B¹ immediately into action and stops the descent of the
driving weight. G is a counter-weight balancing the weight of the hammer H.
t is a pin limiting the movement of the trigger D.
The apparatus being small it can be placed in any locality even where space is
valuable; it is also possible to put the weight at some distance from the spot where
the fan is used when this is desired.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. In a ventilating apparatus the use of a train of wheels actuated by a falling
weight, the said wheels with the exception of the first motion wheel and pinion
being provided with circumferentially ribbed india-rubber rings substantially as
described and for the purpose specified.
2. In a ventilating apparatus wherein a fan is driven by a train of wheels which
with the exception of the first motion wheel pinion, are provided with circum-
ferentially ribbed india-rubber rings, the use of adjustable bearings for the shafts
carrying the friction wheels substantially as described.
3. In a ventilating apparatus the use of an automatic stopping device operating
when the normal velocity of the driving wheel is exceeded and consisting of a
hammer the increased centrifugal force of which overcomes the pressure of a spring
thus causing the said hammer to fly out from its normal position and to bring a
brake into action substantially as described and shown in Figs 4, 5, 6 and 7.

page_text: 4. In a ventilating apparatus the use of a brake to regulate the speed of the fan
consisting of a series of india-rubber rings which by means of a lever are more
or less powerfully pressed against the shaft substantially as described and shown
in Figs 10, 11 and 12.
5. The improved ventilating apparatus constructed, arranged and operating
substantially as described with reference to the drawings.