Compound Gear for Varying Speed.
Year: 1892

page_text: Date of Application, 20th June, 1892
Complete Specification Left, 18th Apr., 1893-Accepted, 27th May, 1893
PROVISIONAL SPECIFICATION.
Compound Gear for Varying Speed.
We, THOMAS THORP, Engineer, of 161 Great Clowes Street, Broughton,
Manchester, and CHARLES WOOD, Engineer, of 76 Bamford Street, Heaton
Norris, Stockport, do hereby declare the nature of this invention to be as
follows:-
In many machines it is desirable to have ready means of driving a shaft at
various speeds, without changing the speed of the motor. This invention relates
to an arrangement of compound gear so disposed on two shafts, a driving and a
driven shaft, that, by the movement of one or other of a set of interlocked clutch
levers, the speed of the driven shaft may at once be changed. The gear may
be sun and planet mitre gear, or may be spur gear. In both cases, the driving
and driven shafts are mounted parallel to one another and connected by spur
gearing. When mitre gear is employed for varying speed, the arrangement is
as follows.
The driving or motor shaft by means of a spur wheel drives an equal spur
wheel which is loose on the driven shaft but can be engaged with it by a clutch,
the driven shaft then working at the same speed as the motor. The motor shaft
also by means of a planet mitre wheel mounted on a sleeve on it so as to revolve
round a stationary sun wheel, drives at half the speed another mitre wheel on a
sleeve and this sleeve by means of a spur wheel on it gearing with a spur wheel
which is loose on the driven shaft but can be engaged with it by a clutch, will then
drive that shaft at half the speed of the motor.
By arranging on the motor shaft a series of the sun and planet mitre gears,
having spur wheels connected to equal spur wheels that can be clutched to the
driven shaft, the speed of that shaft relatively to that of the motor may be
varied according to the series 1,, &c.
By varying the proportions of the spur gear, other variations of relative speed
may be obtained. When spur gear, instead of mitre gear, is employed, the clutches
are arranged to engage with the one shaft, one or other of a set of sleeves carrying
spur wheels which gear with corresponding spur wheels on the other shaft, and on
sleeves on that shaft. If, for example, it is desired to vary the speed of the driven
shaft from 1 to relatively to that of the motor shaft, a clutch is moved so as to dis-
engage the driven shaft from one wheel and engage it with a sleeve carrying another
driven at half the speed; if it is desired to reduce the speed to the sleeve driven
at half speed when disengaged from the driven shaft continues to drive by spur
gear a sleeve on the motor shaft from which another set of the spur gear communi-
cates motion at half speed to another sleeve that can be clutched to the driven
In like manner
shaft, which is thus driven at one fourth the speed of the motor.
other variations of relative speed can be obtained simply by the movement of
sliding clutches worked by levers which are interlocked according to any known
arrangements, such for instance, as those employed for interlocking railway point
and signal levers. This interlocking of the clutch levers prevents any two of the
clutches from engaging at the same time two differently speeded sleeves or wheels.
Dated this 20th day of June 1892.
ABEL & IMKAY,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Compound Gear for Varying Speed.
We, THOMAS THORP, Engineer, of 161 Great Clowes Street, Broughton,
Manchester, and CHARLES WOOD, Engineer, of 76 Bamford Street, Heaton
Norris, Stockport, 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 :-
In many machines it is desirable to have ready means of driving
a shaft at
various speeds, without changing the speed of the motor. This invention relates to
an arrangement of compound gear so disposed on two shafts, a driving and a driven
shaft, that by the movement of one or other of a set of interlocked clutch levers,
the speed of the driven shaft may at once be changed. The gear may be sun and
planet mitre gear, or may be spur gear. In both cases, the driving and driven
shafts are mounted parallel to one another and connected by spur gearing. When
mitre gear is employed for varying speed, the arrangement is as shewn in elevation
and plan by Figs. 1 and 2 of the accompanying drawings.
The driving or motor shaft A. by means of a spur wheel a drives an equal spur
wheel which is loose on the driven shaft B but can be engaged with it by a
clutch C' moved by a lever L, the driven shaft B then working at the same speed
as the motor shaft A. The motor shaft also by means of a planet mitre wheel P¹
mounted on a sleeve D¹ on it so as to revolve round a stationary sun wheel s¹,
drives at twice the speed another mitre wheel s² on a sleeve and this sleeve by
means of a spur wheel a¹ on it gears with a spur wheel b¹, which is loose on the
driven shaft B, but can be engaged with it by the clutch C' moved to the right,
the shaft B being thus driven at twice the speed of the motor shaft A. On the
same sleeve with s and a' is fixed a sun wheel round which revolves the
planet P2 driving st at 4 times the speed of A.
By thus arranging on the motor shaft A. a series of the sun and planet mitre
gears, having spur wheels connected to equal spur wheels that can be clutched to
the driven shaft B, the speed of that shaft relatively to that of the motor may be
varied according to the series 1. 2. 4. &c.
By varying the proportions of the spur gear, other variations of relative_speed
may be obtained. Brackets F1 F2 F3 give bearings for the sleeves D¹ D³ D³
carrying the sun and spur wheels. When spur gear instead of mitre gear is
employed, the arrangement may be as shewn in Fig. 3. Thus a and b being equal
when bis clutched by C', the shaft B revolves at the same speed as A. If a be
double of b¹, then, on clutching 1, B revolves at twice the speed. Again ở² which
is attached to 6' and is double a² drives a² and a³, which is attached to it, at 4 times
the speed of A.; and 63 being equal to a³, when 63 is clutched by C², the shaft B
revolves at 4 times the speed of A. Further, at which is on the same sleeve
with a being double of , when is clutched by C2, the shaft B is driven at
8 times the speed of A. In like manner other variations of relative speed can be
obtained by varying the proportions of the gearing, and by moving sliding clutches
such as CC2 worked by levers, LL' which are interlocked according to any
suitable known arrangement, such for instance as those employed for interlocking
railway point and signal levers. This interlocking of the clutch levers prevents
any two of the clutches from engaging at the same time two differently speeded
sleeves or wheels.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
Compound gear for varying speed consisting of sun and planet and spur gear, or
200
lana maunted
Lan with

page_text: sliding clutches on the latter moved by interlocked levers, each clutch being
arranged to determine either of two speeds as it is moved to left or right,
substantially as described.
Dated the 10th 1
J
A1 1900
ABEL & IMRAY,
Agents for the Applicants.