Improvements in Machine Gearing.
Year: 1899

page_text: Date of Application, 30th Mar., 1899
Complete Specification Left, 30th Jan., 1900-Accepted, 3rd Mar., 1900
PROVISIONAL SPECIFICATION.
Improvements in Machine Gearing.
We, JOHN CHARLES HOWELL, of 24, Queen Victoria Street, in the City of
London, Electrical Engineer, THOMAS HUMPAGE, and HERBERT INNES JACQUES,
both of Luckwell Works, Ashton Gate, Bristol, Engineers, do hereby declare the
nature of this invention to be as follows:.
:-
This invention relates to differential gear adapted for transmitting motion at
slower or higher speeds than that given to the driving shaft.
According to this invention it is proposed that the driving shaft shall impart
motion to a paper or like friction or other gear wheel with which engage oppo-
sitely placed and independently mounted friction or other gear wheels which are
capable not only of turning on their own axis but of also revolving around the
gear directly driven by the driving shaft. The two wheels further bear on or
engage with a surrounding gear or friction drum and where the latter is employed
it may carry internally a pneumatic band by which the pressure on the two
wheels can be regulated and consequently their motion with relation to the driving
shaft can be varied from time to time by simply regulating the resistance offered
to revolution of the drum.
Each axis of the two wheels also carry a gear engaging with a gear on the
differential driven shaft and if further modification of speeds of driven shaft are
required each of said last mentioned pair of gear may also engage with an outer
surrounding gear mounted on a hollow shaft within which the first mentioned
differential driven shaft revolves. Increase speed can be obtained by making
what has been called the driven shaft the driving shaft.
2011
L 1800
Improvements in Machine Gearing.
We, JOHN CHARLES HOWELL, of 24, Queen Victoria Street, in the City of
London, Electrical Engineer, THOMAS HUMPAGE, and HERBERT INNES JACQUES,
both of Luckwell Works, Ashton Gate, Bristol, Engineers, 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 differential gear adapted for transmitting motion at
slower or higher speeds than that given to the driving shaft.
According to this invention it is proposed that the driving shaft shall impart

page_text: motion to a paper or like friction wheel with which engage oppositely placed and
independently mounted friction wheels which are capable not only of turning on
their own axis but of also revolving around the wheel directly driven by the driving
shaft. The two wheels further bear on or engage with a surrounding friction
drum which latter carries internally an elastic pressure device such as a pneumatic
band by which the pressure on the two wheels can be regulated and consequently
their motion with relation to the driving shaft can be varied from time to time
by simply regulating the resistance offered to the revolution of the drum which
may be done by means of a brake on same.
In place of the pneumatic band an expanding ring similar to a spring pressed
piston ring can be employed.
Each axis of the two wheels also carries a gear engaging with a gear on
the differential driven shaft and if further modification of speeds of the driven
shaft are required each of said last mentioned pair of gear may also engage with
an outer surrounding gear mounted on a sleeve within which the first mentioned
differential driven shaft revolves. Increased speed can be obtained by making
what has been called the driven shaft the driving shaft..
As an illustration of one means by which our invention may be carried into
effect we have shown a gearing in the accompanying drawing in which :-
Fig. 1 is a longitudinal section, and
Fig. 2 a cross section on line of Fig. 1.
In this form the fast driven shaft 1, say the spindle of an electric motor, is
supported in a suitable bearing 2, and has mounted freely upon it the end plate 3
of a drum 4 as well as an arm 5. At the end of the shaft is carried a friction
wheel or pulley of compressed paper or other suitable material with which
engages the oppositely arranged friction wheels 7, 7 the spindles of which are
carried in radial slots 8 in the arm 5 and in an arm 5ª respectively, or in place
of two wheels 7, 7 one may be employed if a suitable balance weight is used
instead of the other wheel.
Outside of the wheels 7, 7 is situated the friction drum 4 which is provided
with means for bringing pressure upon the wheels 7, 7 so that they may be
brought closely and firmly into contact with the driving wheel 6. In the case
shewn these means consist of a pneumatic tube 9 of flexible material having a
protecting cover 10 of some suitable material such as rubber, on the surface of
same, against which the wheels 7 work, such cover being held in place by any
suitable means.
The tube is provided with a valve 11 such as is usually employed
with these tubes by which it may be filled with air to bring the desired pressure
upon the wheels 7, 7. Or the pressure may be put upon said wheel by other
means as stated. Around the drum is arranged a brake band 12 which may be
attached as by a hinge to a fixed part 12 toward which it may be drawn by means
of the screw 13 of the handle 14 so that the band may be closed to hold the drum.
The spindle of the wheels 7, 7 also carry gears 15, 15 engaging with a gear 16
on the differential driven shaft 17 and in the arrangement shewn the gears 15, 15
also engage with an outer surrounding gear 18 having a hollow shaft 18ª carried
by a bearing 2ª and free to revolve on the shaft 17. The other end plate 3ª of
the drum is supported by and free to revolve on this sleeve.
It will be evident that the gears 16 or 18 may be used separately but the use
of the two give another speed from the hollow shaft 18ª or a still further speed
could be obtained from the drum 4 by a belt or otherwise of the shafts 17 and 18*
are suitably held.
In operation it will be seen that the power is transmitted from pulley 6 to
wheels 7 (the drum 4 being held by the brake) and to the gears or the like 15
of wheels 7 which will transmit it to gear 16 and shaft 17 or gear 18 and
shaft 18 whichever is required or it will transmit power to both though in
opposite directions.
'
The apparatus may be made in various other forms and with other arrange-
ments of parts than those shown.

page_text: 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:-
1. In machine gearing the combination with driving or driven wheels of a
surrounding ring and means for exerting an elastic pressure between such wheels
and ring substantially as described.
2. In a gearing, a central driving or driven wheel, a transmitting wheel or
wheels driven by or driving same, a surrounding drum or ring free to revolve,
means for holding such part when desired, interposed elastic means for maintain-
ing the transmitting wheel or wheels in contact with the central wheel and the
surrounding part, and wheels carried by the transmission wheels and engaging
with one or more further wheels acting as driven or driving wheels substantially
as described.
1000
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicants.