Improvements in Variable Speed Driving Gear.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Variable Speed Driving Gear.
•
I, ALFRED EDWARD CREESE, of 58, Myddelton Street, Rosebery Avenue, in
the County of London, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
-
This invention relates to improvements in variable speed driving gear,
chiefly designed for use upon self-propelled road vehicles.
According to the invention I construct my variable speed gear of a toothed
wheel keyed upon the driven shaft and gearing with two pinions preferably
arranged diametrically opposite to one another, the said pinions being mounted
in bearings in a frame or a casing surrounding the three gear wheels. The
frame or casing is loosely mounted upon the driven shaft and each of the pinion
shafts or spindles has keyed upon it a pulley, the said pulleys being connected
by means of belts or the like to pulleys upon the crank or driving shaft of the
motor driving the vehicle.
Means, such as a rod and lever, are provided for swivelling or turning the
loose frame or casing upon the driven shaft and the belts are so arranged that
when the line joining the axes of the two pinions is practically vertical, the
belts run loosely upon the pulleys so that the vehicle is at rest. If, however,
the lever be operated so as -to swing the frame or casing in either direction
upon the driven shaft, one or other of the belts will be tightened so that the
pinion corresponding thereto will operate the driven shaft.
With this arrangement it will be obvious, therefore, that I can obtain two
extreme speeds by having different diameters of pulleys upon the pinions or
upon the driving shaft and that, by varying the tension of the operating belt,
I can obtain any speed between the two above-mentioned limits.
The pinions are preferably mounted eccentrically in bearing bushes which
are fitted into the frame or casing so that by turning the said bushes the
pinions can be adjusted to compensate for wear and prevent rattling. A nut
or other suitable device can be used for locking the bushes in the positions to,
which they are adjusted.
I can employ two or more such driving gears so as to obtain further speeds
and, if required, also provide for reversing the vehicle at any desired speed.
Dated this 17th day of June 1899
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.

page_text: I, ALFRED EDWARD CREESE, of 58, Myddelton Street, Rosebery Avenue, in
the County of London, Engineer, do hereby declare the nature of this inven-
tion 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 improvements in variable speed driving gear,
chiefly designed for use upon self-propelled road, vehicles:
According to the invention I construct my variable speed gear of a toothed
wheel keyed upon the driven shaft and gearing with two pinions preferably
arranged diametrically opposite to one another, the said pinions being mounted
in bearings in a frame or a casing surrounding the three gear wheels. The
frame or casing is loosely mounted upon the driven shaft and each of the pinion
shafts or spindles has keyed upon it a pulley, the said pulleys being connected
by means of belts or the like to pulleys upon the crank or driving shaft of the
motor driving the vehicle.
Means, such as a rod and lever, are provided for swivelling or turning the
loose frame or casing upon the driven shaft and the belts are so arranged that
when the line joining the axes of the two pinions is practically vertical, the
belts run loosely upon the pulleys so that the vehicle is at rest. If, however,
the lever be operated so as to swing the frame or casing in either direction
upon the driven shaft, one or other of the belts will be tightened so that the
pinion corresponding thereto will operate the driven shaft.
J
PROSL
With this arrangement it will be obvious, therefore, that I can obtain two
extreme speeds by having different diameters of pulleys upon the pinions, or
upon the driving shaft and that, by varying the tension of the operating belt,
can obtain any speed between the two above-mentioned limits.
The pinions are preferably mounted eccentrically in bearing bushes which
are fitted into the frame or casing so that by turning the said bushes the
pinions can be adjusted to compensate for wear and prevent rattling. "Anut
or other suitable device can be used for locking the bushes in the positions to
which they are adjusted.
I can employ two or more such driving gears. so as to obtain further speeds
and, if required, also provide for reversing the vehicle at any desired speed.
To enable my invention. to be fully understood I will describe it by reference
to the accompanying drawing, in which:-
M
[DG
Figure 1 is a sectional side elevation of variable speed driving gear con-
structed. according to the invention; and
2
Figure 2 is a sectional end elevation thereof the section being taken on the
line 2-2 Figure 1.
a
********
is the driven shaft and bis the toothed wheel which is keyed thereon.
c, c¹ are the two pinions which gear with the toothed wheel. 6 and is the
frame or casing which encloses the wheel b and pinions c, c¹, the said casing
being loosely mounted' upon a bush e upon the boss b¹ of the toothed wheel b
Each of the pinions c, d is keyed upon a spindle f which is mounted eccentri-
cally in a bush inserted in a. sleeve or socket h formed in the casing d the
said bush being, held in position in the socket by the nuts, The spindles
f, f project through the frame of casing and the projecting portion of each
has keyed upon it a pulley; the said pulleys are lettered j and j respectively
and the pulley j is shewn of larger diameter than the pulley j. k, kare the
f

page_text: belts which extend from the pulleys j, j to pulleys 7, 7 upon the driving
shaft m.
.i
: "
n is the hand lever for operating the driving gear in the manner hereinafter
explained. This hand lever is pivoted to a toothed sector o and is provided with
a spring pin n¹ which is normally held in engagement with one of the teeth in
the sector o but can be released therefrom by means of the pivoted handle.
The short arm of the lever n is pivoted to one end of a link q the other end of
which is pivoted to a stud q¹ fitted to the casing d.
With this arrangement when the line joining the axes of the two pinions c, el
is practically vertical, as shewn in the drawing, the two belts k, k¹ run loosely
upon the pulleys, so that no motion is transmitted from the driving shaft
to the toothed wheel b. If, however, the lever n be operated so as to swing
the frame or casing in either direction upon the driven shaft a, one or other
of the belts will be tightened so that the pinion corresponding thereto will
operate the driven shaft. As the two pulleys are of different diameters it will
be obvious that the velocity of rotation communicated to the driven shaft will
vary according to which of the belts is tightened, and that by varying the
tension of the operating belt any speed between the two limits can be obtained.
By mounting the pinion spindles f, fi eccentrically in the bushes g, g I am
enabled by adjusting the said bushes in their sockets or sleeves, to compensate
for wear and thereby prevent rattling.
Instead of making the pulleys j, of different diameters I can make the
pulleys, of different diameters. Furthermore, two or more driving gears
of the kind herein before described can be employed upon one vehicle whereby
further speeds can be obtained, and, when required, I can also provide for
reversing the vehicle at any desired speed, by the employment, for example, of
a crossed belt.
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 variable speed driving gear, the combination with a shaft of a toothed
wheel secured thereon, an adjustable frame loosely mounted on said shaft,
two pinions mounted on said frame and meshing with said toothed wheel, and
an independent pulley for each of said pinions, substantially as described.
2. In a variable speed driving gear, the combination with the driving shaft,
of a driven shaft, a toothed wheel secured thereon, a frame loosely mounted on
said driven shaft, two pinions mounted on said frame, and meshing with said
toothed wheel, an independent pulley connected with each of said pinions,
operative connections between the said pulleys and the driving shaft, and adjust-
ing devices connected with said frame, substantially as described.
3. In a variable speed driving gear, the combination with the driving shaft,
of a driven shaft, a toothed wheel secured thereon, a frame loosely mounted on
said driven shaft, two pinions mounted on said frame and meshing with said
toothed wheel, an independent pulley connected with each of said pinions, belts
extending from said pulleys to the driving shaft, and adjusting devices connected
to said frame whereby one. or the other of said belts may be tightened, substan-
tially as described.
4. In a variable speed driving gear, the combination with the driving shaft
provided with driving pulleys, of a driven shaft, a toothed wheel keyed thereon,
a movable frame loosely mounted on said driven shaft, two pinions mounted on
said frame on opposite sides of the toothed wheel and meshing therewith, two
pulleys of different sizes connected each with one of said pinions, belts connect-
ing said pulleys with the driving pulleys on the driving shaft, a shifting lever,
and operative. connections between said lever and the said frame, substantially
as described.
5. In a variable speed driving gear, the combination with a shaft, of a toothed

page_text: wheel fast thereon, a frame loosely mounted on said shaft, bushes adjustably
mounted in said frame, spindles supported eccentrically in said bushes, pinions
mounted on said spindles, and meshing with said toothed wheel, an independent
pulley secured to each of said pinions, and means for securing said bushes in
position in the frame, substantially as described.
6. The combination and arrangement of parts forming the improved variable
speed gear herein before described and illustrated in the accompanying drawing.
Dated the 15th day of March 1900.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.