IMPROVEMENTS IN DIFFERENTIAL GEAR APPLICABLE TO TRICYCLES AND FOR OTHER PURPOSES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, JAMES JOHN MILLER, of Creek Works, Hammersmith in the County of
Middlesex, Engineer and Boat Builder, do hereby declare the nature of said
invention for "IMPROVEMENTS IN DIFFERENTIAL GEAR APPLICABLE TO TRICYCLES
AND FOR OTHER PURPOSES" to be as follows:-
According to this invention a main driving shaft is provided on which are fitted
two pairs of bevil wheels one of each pair driving its fellow by means of an
intermediate pinion or pinions.
For the sake of clearness I will call the bevil wheels constituting the two pairs
No 1, No 2, No 3, and No 4 respectively.
One of these bevil wheels (No 1) is keyed to the driving shaft, and drives its
fellow wheel (N° 2) by means of an intermediate pinion revolving freely on a stud or
pin fixed in the framing. This wheel (N° 2) is connected back to back with another
bevil wheel (N° 3) by a common boss bored so as to revolve freely on the driving
shaft this wheel (No 3) drives another bevil wheel (No 4) by means of one or more
intermediate bevil pinions revolving freely on a pin or pins set radially in a frame
or wheel having a boss turned so as to run freely on the driving shaft between
wheels No 3 and 4 and in a parallel plane in a manner similar to that which
obtains in the well known "Jack-in-the-box" motion. The said frame or wheel is
capable of being rotated on the driving shaft independently of the motion of that
shaft, and for this purpose teeth may be cut in the periphery of such wheel which
may gear with a worm or pinion with bearings attached to the frame, or it may be
rotated by means of handles or lovers as desired.
No 4 wheel has its boss somewhat lengthened and to this boss is attached one of
he driving wheels, the other driving wheel being fixed to the other end of the
haft namely the same end to which No 1 wheel is keyed,
The action of the apparatus is as follows:-When the shaft is rotated No 1
wheel is driven with it, Nos 2 and 3 wheels are driven in a reverse direction, and
o long as the frame or wheel carrying the axis of the pinion between Nos 3
nd 4 wheels is held fast No 4 wheel and boss are driven in the same direction as
TD

page_text: No 1 wheel and the driving shaft (that is to say) Nos 1 and 4 wheels rotate av
the same speed and with the shaft, consequently both driving wheels revolve
simultaneously but should the frame or wheel carrying the axis of the pinion
between Nos 3 and 4 wheels be turned in one direction the boss of No 4 wheel
and its driving wheel will rotate either one way or the other on the driving shaft E
according to which way the said frame or wheel is rotated, thus giving a differential
motion to the driving wheels as may be desired.

page_text: I, JAMES JOHN MILLER, of Creek Works, Hammersmith, in the County of
Middlesex, Engineer and Boat Builder, do hereby declare the nature of my
invention for "IMPROVEMENTS IN DIFFERENTIAL GEAR APPLICABLE TO TRICYCLES
AND FOR OTHER PURPOSES" and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement:-
1
According to this invention a main driving shaft is provided on which are fitted
two pairs of bevil wheels one of each pair driving its fellow by means of an
intermediate pinion or pinions.
For the sake of clearness I will call the bevil wheels constituting the two pairs
No 1, No 2, No 3, and No 4 respectively. One of these bevil wheels (No 1) is
keyed or otherwise fixed to the driving shaft and drives its fellow wheel (N° 2) by
means of an intermediate pinion revolving freely on a stud or pin fixed in the
framing. This wheel (No 2) is connected back to back with another bevil wheel
(No 3) by a common boss bored so as to revolve freely on the driving shaft;
this wheel (N° 3) drives another bevil wheel (No 4) by means of one or more
intermedinte bevil pinions revolving freely on a pin or pins set radially in a frame
or wheel having a boss turned so as to run freely on the driving shaft between
wheels Nos 3 and 4 and in a parallel plane in a manner similar to that which
obtains in the well known "Jack-in-the-box "motion.
The said frame or wheel is capable of being rotated on the driving shaft
independently of the motion of that shaft and for this purpose teeth may be cut
in the periphery of such wheel which may gear with a worm or pinion with
bearings attached to the frame or it may be rotated by means of handles or lovers
as desired,
No 4 wheel bas its boss somewhat lengthened and to this boss is attached one of
the driving wheels the other driving wheel being fixed to the other end of the
shaft namely the same end to which No 1 wheel is keyed.
In the accompanying sheet of illustrative drawings Fig 1 is a plan or top view
of an arrangement of differential gearing according to my invention and Fig 2 is
a longitudinal section of the same. Fig 3 is an end view of apparatus such as
shewn in Fig 2 looking in the direction of the arrow.
a is the main driving shaft carrying the two pairs of bevel wheels 1-2 and
3-4. b is the intermediate bevel pinion whereby the bevel wheel 1 fixed to the
driving shaft a drives its fellow wheel 2. c is the stud or pin on which the bevel
pinion 6 rotates, and is carried in the fixed frame or bracket & of the apparatus.
The bevel wheel 2 is connected to the bevel wheel 3 by a boss or pipe e common
to the two, and which is bored so as to turn freely on the driving shaft a.
The bevel wheel 3 drives the bevel wheel 4 by means of the intermediate bevel
pinions frotating freely on pins g, g' set radially in the frame or worm wheel /
having a boss ¹ bored so as to be capable of revolving freely on the shaft a
between the wheels 3 and 4. i is a worin fixed to a shaft i carried in bearings d'
in the frame d. This worm i gears with the worm wheel h so that the latter may
be rotated in either direction on the main driving shaft a at any desired speed
independently of the motion of that shaft.
In lieu of the worm and worn wheel it will be obvious that a spur wheel
and pinion may be employed or the wheel may be provided with handles or levers
for rotating it when desired.
The boss of the bevel wheel 4 is lengthened as shown and to this boss is
attached one of the driving wheels (say of a velocipede) or the wheel to which the

page_text: differential motion of the gearing is to be imparted. The other driving wheel is
fixed to the main driving shaft a to the left of the bevel wheel 1 and is not shown.
k is a collar or boss arranged between the bevel wheels 1 and 2 but prevented from
rotating by the fixed arm or.bracket k¹ to which it is screwed. The boss or collar
servos to support, one end of the pin c and thereby ensures a steady motion of the
bevel pinion b.
:
The action of the apparatus is as follows:-
When the shaft a is rotated by a driving wheel fixed thereto the wheel 1 is
driven with it,' the wheels 2 and 3 being driven in a reverso direction by reason
of the intermediate pinion b. So long as the frame or wheel / carrying the
pinions, between the wheels 3 and 4 is held fast, wheel 4 and its attached boss
and driving wheel (not shown) will be driven in the same direction as the wheel 1
and driving shaft a, (that is to say) the wheels 1 and 4 rotate at the samo speed
and in the same direction as the shaft consequently both driving wheels (not
shown) revolve simultaneously, but should the frame or wheel / be turned in one
direction the boss of wheel 4 and its attached driving wheel will rotate either one
way or the other or be brought to rest on the driving shaft according to which
way the said frame or wheel is rotated and to the rate at which it is rotated
relatively to that of the wheel 3, thus giving a differential motion to the driving
wheels as may be desired.
The differential gearing above described may evidently be employed for various
purposes.
Having now particularly described and ascertained the nature of my said
invention and in what manner the samo is to be performed, I declare that what
I claim is :-
The construction and arrangement of differential gearing, substantially as herein-
before described with reference to and shown in the drawings.
Dated this 16th day of December 1884
JAMES JOHN MILLER.
W. Lloyd Wisc,
Per F. J. Brougham,
Applicant's Agent.