An Improved Differential-speed Driving Gear for Motor-cars and other Machinery.
Year: 1897

page_text: Date of Application, 31st Dec., 1897
Complete Specification Left, 30th Sept., 1898-Accepted, 5th Nov., 1898
PROVISIONAL SPECIFICATION.
PROVISIONAL SPECIFICATION.
An Improved Differential-speed Driving Gear for Motor-cars
and other Machinery.
I, SAMUEL EDWARD BAGSHAW, Mechanic, residing at Ryton, near Coventry, in
the County of Warwick, do hereby declare the nature of this invention to be as
follows:-
This invention consists in an improved construction of differential-speed
driving gear to be used in connection with various forms of machinery, but which
has distinct applicability to motor-cars and such like.
The said gear is intended to form the connection link between a driving and
a driven shaft or their equivalents, and its construction is such that varying
speeds can be transmitted from the one shaft to the other without any compli-
cated mechanism.
The essential features of this improved differential-speed driving gear are a
principal wheel of a bevel construction having upon one of its faces a number of con-
centric toothed facets, a number of bevel wheels or pinions carried upon a shaft at
right angles to the axis of the principal wheel and which are adapted to engage
the different toothed facets of the principal wheel, a number of levers or jointed
arms arranged so as to move the said bevel wheels or pinions into and out of
action with the toothed facets of the principal wheel, and a number of cams,
carried upon a rotating shaft operated by hand, which are in gear with the
operating levers, as aforesaid, for the purpose of rocking them and consequently
controlling the bevel wheels or pinions.
As an illustration of the carrying out of this invention the principal wheel is
mounted upon a rotating shaft journalled in suitable bearings and has formed
upon its face three annular bevel toothed facets, one at its extreme diameter,
another near its centre, and an intermediate one between the two. Upon a suitably
mounted shaft disposed at right angles to the axis of the principal wheel, and
arranged so that one of them is adjacent to each of the bevelled toothed facets,
are carried three bevelled wheels or pinions, each capable of sliding upon the shaft
independent of each other, but rotating in common by reason of a key. This
shaft is preferably the driving shaft, but it may be the driven.
Upon a counter-shaft or spindle running parallel with the bevel pinions shaft
and having a capstan or hand wheel termination are fixedly connected three
groove cams, the purpose of these being to control the meshing of the bevel
pinions with the toothed facets on the principal wheel, one cam being appointed
to each bevel pinion. Connecting each cam with its respective bevel pinion is
a lever or a arm, jointed at one end to a stationary framing part or its equivalent,
at the other end bifurcated into a concentric groove or neck of a boss on the side
of the bevel wheel, and engaging at its middle with the groove in the periphery
of the said cam; anti-friction rollers being fitted to the parts of working contact.

page_text: The dispositions, or the setting, of the cams are such that when the one pinion
is in gear the other two are out of gear, and also that the change from a high
speed to a low speed can be gradually brought into action by bringing into action
the intermediate speed gear; it being obvious that if the pinion shaft is the driving
shaft the inner bevel wheel will be the high speed gear and the outer bevel wheel
the low speed gear or vice-versâ if the principal wheel shaft is the driving one
and the pinion shaft the driven.
The cams are operated or turned by hand, and they control the levers which
bring into and out of gear the driving and driven wheel or wheels, and it is
therefore obvious that a sure and rigid meshing of the teeth of the different
wheels will result.
In another form of this invention the bevel pinion shaft would be extended
right across the face of the principal wheel, and upon its extended end arranged
a number of bevel pinions to constitute a reversing gear either in respect of the
shaft of the principal wheel or the bevel pinions shaft; the said pinions being
operated by similar cam mechanism to that before described.
In another form, instead of having toothed facets only, the whole of the face of
the wheel may be plain, and a friction disc or discs substituted for the bevel
pinions with a similar differential-speed driving gear as that herein before
described.
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1
1000
COMPLETE SPECIFICATION.
An Improved Differential-speed Driving Gear for Motor-cars
and other Machinery.
I, SAMUEL EDWARD BAGSHAW, Mechanic, residing at Ryton, near Coventry, in
the County of Warwick, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention consists in an improved construction of differential speed
driving gear to be used in connection with various forms of machinery, but which
has distinct applicability to motor-cars and such like.
The said gear is intended to form the connection link between a driving and
a driven shaft or their equivalents, and its construction is such that varying
speeds can be transmitted from the one shaft to the other without any compli-
cated mechanism.
The essential features of this improved differential-speed driving gear are a
principal wheel of a bevel construction having upon one of its faces a number of con-
centric toothed facets, a number of bevel wheels or pinions carried upon a shaft at
right angles to the axis of the principal wheel, and which are adapted to engage
the different toothed facets of the principal wheel, a number of levers or jointed
armis arranged so as to move the said bevel wheels or pinions into and out of
action with the toothed facets of the principal wheel, and a number of cams,
carried upon a rotating shaft operated by hand, which are in gear with the
operating levers as aforesaid for the purpose of rocking them, and consequently
controlling the bevel wheels or pinions.

page_text: In the accompanying sheet of drawings an illustration of the carrying out of
this invention is shown in Figs. 1 and 2, the last named fig. representing a face
view of half only of the principal wheel. This last named, which is marked a,
is mounted upon a rotating shaft a journalled in suitable bearings, and it has
formed upon its face, a³, three annular bevel toothed facets c, c², c³, one facet being
at its extreme diameter, another near its centre, and another intermediate between
the two; so that practically the face of the principal wheel constitutes three
different sized driving wheels to the shaft a².
Upon a suitably mounted shaft & disposed at right angles to the axes of the
principal wheel, and arranged so that one of them is adjacent to each of the bevel
toothed facets upon the one side of the centre of the principal wheel, are carried
three bevel wheels or pinions 2, d³, d, each being capable of sliding upon the
shaft d independent of each other but of rotating in common with the said shaft.
Each of the pinions or wheels has a collar e formed rigid with it upon its one side,
and each collar is formed with a concentric groove for the purpose hereinafter
described. Upon a second shaft 9 running parallel with the shaft d are fixedly
mounted three groove cams g², g³, g, one of which is set off for, and arranged
adjacent to, each of the bevel pinions aforesaid. The purpose of these cams is to
control the meshing of the bevel pinions with the toothed facets on the principal
wheel, and the means for connecting them with the said pinions are three arms
or levers i, 22, 23, which are jointed at one end it to a stationary framing part 2,
and at their other end bifurcated into the concentric grooves, as aforesaid, in
the bosses e of the bevel pinions; the said levers or arms engaging at their middle
parts, 7, with the grooves in the peripheries of the cams. Anti-friction rollers are
fitted to the parts of the levers in working contact with the cams and the pinions.
The shaft is operated or turned by hand, and the dispositions or the setting
of the cams 2, 3, g, thereon are such that when one of the pinions is in gear with
the principal wheel the other two are out of gear.
It will be obvious that if the shaft d is the driving one, the pinion d is for
slow driving, the pinion for fast driving, and the pinion for intermediate;
if the shaft a is the driving one then the order of driving, relative to speed,
is changed, the pinion in this case being the fastest one.
The invention has so far been described as a one direction driving mechanism,
but it can be made, as is indicated in the drawing, reversible, and to do this a
number of pinions and cams are arranged in manner to the ones, m, m², to mesh
with the facets of the principal wheel upon both sides of its centre; it being
understood that this arrangement is in view of the driving shaft always rotating
in the same direction.
The contacts of the pinions and the principal wheel may. be frictional instead
of toothed.
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:-
First. A differential speed gear characterised by a principal wheel having a
number of facets thereon and which forms either the driving or the driven part
of the mechanism, and a number of pinions which are carried upon a shaft so
as to slide and be capable of being brought to mesh one at a time with the facets
of the principal wheel, the said pinions being either carried upon the driving or
the driven part of the mechanism, substantially as described and set forth.
Second. A differential speed gear having in its combination a principal wheel
having a number of facets thereon and which is connected either to the driving or
to the driven part of the mechanism, a number of pinions carried upon a driving or
driven shaft so as to slide and be capable of being brought to mesh one at a time
with the facets of the principal wheel, a number of cams which govern the meshing

page_text: of the said pinions with the principal wheel, and a number of levers or arms
which form the connection between the cams and the pinions, substantially as
set forth.
Ta
1000
W. P. THOMPSON & Co.,
11, Burlington Chambers, New Street, Birmingham,
Also of Liverpool, London, and Manchester,
Patent Agents for the Applicant.