Year: 1888

page_text: Date of Application, 7th Jan., 1888*
Complete Specification Left, 18th Sept., 1888
Complete Specification Accepted, 19th Oct., 1888
I, STEPHEN MARTIN, of 181 Birchfield Road, Handsworth in the County of
Staffordshire Works Manager, do hereby declare the nature of this invention to be
as follows:-
My invention relates to an improvement in that type of differential or "balance"
gear set forth in Patent No. 3388 of 1877, and it has for its objects, First tho.
adaptation of such gear to a divided axle for central-geared and driven machines, and
Secondly, certain improvements in the details of construction, whereby greater
durability and efficiency are attained.
To these ends I construct my improved gear in the following manner;-I form the
chain wheel in two parts, one being the rim provided with suitable cogs or teeth to
engage with the particular type of driving chain to be used, and the other the boss or
eye of the wheel carrying the arms or spokes, which latter are adapted to fit in slots
or their equivalent in the inner side of the rim carrying the cogs or teeth, and are
fixed thereto by suitable screws. Through the boss or eye of the wheel is drilled a
transverse hole to receive a spindle carrying at one end a small bevel pinion and at
the other end a nut or its equivalent to keep the said spindle in place.
On to the inner ends of the divided axle (the outer ends carrying the driving wheels)
are fixed small bevel wheels which gear with the bevel pinion hereinbefore referred to,
and are recessed on their inner faces to fit over and bear on the extended boss of the
chain wheel. Suitable dust covers fit over each bevel wheel and within the rim of the
chain wheel so as to completely enclose the gear.
The inner ends of the divided axle are preferably extended to fit within and support
the boss or eye of the chain wheel, sufficient clearance being left between the inner
ends to clear the transverse spindle carrying the bevel pinion.
DIL
1
. Լ
1000
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer & Patent Agent,
Royal Courts Chambers,
70, 71 & 72, Chancery Lane, London, W.C.,
Agent for the Applicant.

page_text: I, STEPHEN MARTIN of 181 Birchfield Road, Handsworth in the county of
Staffordshire, Works Manager, 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 :--
My invention relates to an improvement in that type of differential or "balance"
gear, set forth in Patent No. 3388 of 1877, and it has for its objects, First, the
adaptation of such gear to a divided axle for central geared and driven machines; and
Secondly, certain improvements in details of construction, whereby greater durability
and efficiency are attained.
To attain these.ends I construct my improved gear in the following manner :-
I form the chain wheel in two parts, the one part being the rim, having on its
periphery suitable projections, forming cogs or teeth to engage with the particular
type of driving chain to be used, and the other the boss of the wheel carrying the
arms or spokes, which are adapted to fit in slots or their equivalent in the inner side
of the rim carrying the cogs or teeth, and fixed thereto by suitable screws. Through
the boss of the wheel is drilled a transverse hole to receive a spindle carrying one
or two equal-sized small bevel pinions. One of these pinions is preferably formed in one
with the spindle, and the other is mounted loosely on the opposite end of the said
spindle, and is kept in position by means of a nut or equivalent device.
On the inner ends of the divided axle (the outer ends carrying the driving wheels)
are fixed small equal-sized bevel wheels, which gear with the bevel pinion or pinions
hereinbefore referred to, and which fit over and bear on the extended boss of the
chain wheel, being kept in position-to ensure their gearing with the bevel pinion or
pinions by a circumferential tongue and groove on, and in, the bevel wheel and the
boss of the chain wheel respectively.
Suitable dust covers fit over each bevel wheel and within the rim of the chain wheel
so as to completely enclose the gear.
In order that my invention may be fully understood, I will now more particularly
describe it, making reference to the accompanying drawing in which Figure 1. is a
view in side elevation and partly in section of my improved gear, Figure 2. is a view
in end elevation showing the construction of the chain wheel, the bevel pinions and
spindle being shown in dotted outline; and Figure 3 is a view in cross section of the
boss of the chain wheel, and the bevel pinions and spindle.
Throughout these views similar parts are marked with like letters of reference.
Referring to the accompanying drawing, A designates the rim of the chain wheel,
having on its periphery cogs or teeth a, a etc. to engage with the particular type of
driving chain to be used, and A¹ designates the boss of the said wheel carrying arms or
spokes a, a etc. the free ends of which are adapted to fit in slots or recesses in the inner
side of the rim A carrying the cogs or teeth a, a etc., and are fixed thereto by means
of screws a², a passing through the rim A and threading into the arms
spokes a¹. a¹.
ог

page_text: B designates the spindle mounted in the boss A¹ in such a manner as to turn freely
therein, and having a bevel pinion B' formed on one end of it, and being reduced in
diameter at the other end to receive a loose bevel pinion B2, which is locked to the
spindle B by means of a nut b as illustrated.
On the inner ends of the divided axle C are fixed-by means of screws c, c-small
bevel wheels D, D, which gear with the bevel pinions B1 and B2. These bevel wheels
are recessed to fit over and bear on the boss A¹ of the chain wheel, and are kept
up thereto to keep them in gear with the bevel pinions by means of a circumferential
tongue and groove on and in the bevel wheel and boss of the chain wheel respectively.
This is carried out as illustrated by Figure 1. of the accompanying drawing which
illustrates two methods of doing so. In the one case the tongue d is formed as part
of the boss of the bevel wheel D and the groove a³ is formed by reducing the diameter
of the boss A and fitting it with a circular nut at of a greater diameter. In the other
case the groove a³ is formed in the boss A' and the tongue d is formed as a collar
formed in halves for convenience in construction-and fixed to the boss of the bevel
wheel D by screws d', d'-E, E designate the dust covers fixed to the wheels D, D,
by suitable screws e, e etc.
By constructing the chain wheel in two parts as hereinbefore described I am able
to make one of the bevel pinions in one piece with the spindle, and also to give the
spindle a long bearing through the boss of the whéel, whereby I obtain a free and
smooth running gear, not liable to bind or otherwise get out of order.
I am aware that differential or "balance" gears have already been constructed
with two hevel wheels and one or more bevel pinions each arranged to gear with the
bevel wheels, and I therefore do not claim such a device broadly, but 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. A differential or "balance gear
set forth.
for velocipedes constructed specifically as
2. In a differential or "balance gear" for velocipedes having one or more bevel
pinions engaging with two bevel wheels mounted opposite to one another, mounting
the bevel pinion or pinions on a spindle passing completely through the boss or eye of
the chain wheel, in the manner and for the purpose set forth.
3. In a differential or "balance" gear for velocipedes forming the driving chain
wheel in two parts, in the manner and for the purpose hereinbefore set forth.
4. In a differential or "balance gear" for velocipedes the combination with the
driving axle, of the chain wheel formed in two parts and having a solid boss, the
compound pinion and spindle mounted in the said boss, and the bevel wheels adapted
to fit over the ends of the boss of the chain wheel and to be retained in position
therewith, all arranged and operating as and for the purpose set forth.
5. In a differential or "balance" gear consisting of one or more bevel pinions each
gearing with two bevel wheels, the method of mounting the bevel pinion or pinions
on the chain wheel, and of confining the bevel wheels on the boss of the chain wheel
to ensure their perfect gearing with the said pinion or pinions, as set forth.
Dated this 18th day of September 1888.
ROBT. ED. PHILLIPS, M.I.M.E.,
Royal Courts Chambers,
70, Chancery Lane, London, W.C.,
Agent for the Applicant.