Improvements in Driving Gear for Cycles, Motor-cars, and similar Vehicles.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Driving Gear for Cycles, Motor-cars, and similar
Vehicles.
I, CASIMIR ALEXANDER BOUNEVIALLE, of 51 Manor Street, Clapham, in the
County of London, Gentleman, do hereby declare the nature of this invention
to be as follows:-
This invention has reference to improvements in the driving gear of cycles,
motor-cars, and similar vehicles and has for object to so construct the chain
wheels and chain that the chain wheel will not be so liable as heretofore to
become clogged by dust, mud, etc., and that friction will be reduced, thus obviating
the necessity of employing gear cases or other like mud excluding devices and
securing an economy in the power expended in driving the gear.
According to one arrangement the chain wheel is formed with a circum-
ferentially grooved or channelled outer periphery the flanges or siue portions
thereof being made of thin or sheet metal slotted or indented to form alternate
recesses and teeth. For use with wheels of this construction I provide a driving
chain having lateral studs or projections adapted to enter between and engage
with the teeth of the chain wheel and which may conveniently be formed by
making the transverse pins that connect the links of the chain together project
beyond the sides of the said links to such an extent that they will overlap the
teeth on the side portions or edges of the periphery of the wheels and take into
the slots or recesses between the said teeth, the arangement being such that the
links of the driving chain will not bear upon the bottom or touch the sides of
the circumferential grooves or channels on the chain wheels.
In another arrangement instead of employing a chain formed of links with
projecting pins as above described I use an endless band of suitable flexible
inaterial such as steel provided with suitable lateral projections adapted to take
into the slots or recesses between the teeth of the chain wheels.
I prefer to form the lateral studs or projections of reduced diameter where they
come in contact with the teeth of the wheels the diameter of the studs or
projections being gradually increased on each side of the teeth so that the chain
will always have a tendency to assume a position in which its links will
not touch the flanges or side portions of the wheels.
Driving mechanism such as described can be made very light without impairing
ts durability or strength; at the same time the area of the points of frictional
contact is reduced to a minimum and there is no liability of mud or dust
collecting on or between the thin teeth of the chain wheels.
Dated this 3rd day of October 1806

page_text: COMPLETE DI EVITICATION
Improvements in Driving Gear for Cycles, Motor-cars, and similar
Vehicles.
.
I, CASIMIR ALEXANDER BOUNEVIALLE, of 29, Gauden Road, Clapham, in the
County of London, late of 51 Manor Street, Clapham, aforesaid, Gentleman, 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:
This invention has reference to improvements in the driving gear of cycles,
motor-cars, and similar vehicles and has for object to so construct the chain
wheels and chain that the chain wheels will not be so liable as heretofore to
become clogged by dust, mud, etc., and that friction will be reduced, thus obviating
devices and
the necessity of employing gear cases or other like mud excluding,
securing an economy in the power expended in driving the gear.
According to one arrangement the chain wheel is formed with a circum-
ferentially grooved or channelled outer periphery the flanges or side portions
thereof being made of thin or sheet metal slotted or indented to form alternate
recesses and teeth. For use with wheels of this construction I provide a driving
chain having lateral studs or projections adapted to enter between and engage
with the teeth of the chain wheels and which may conveniently be formed by
making the transverse pins that connect the links of the chain together project
beyond the sides of the said links to auch an extent that they will overlap the
teeth on the side portions or edges of the periphery of the wheels and take into
the slots or reces es between the said teeth, the arrangement being such that the
links of the driving chain will not bear upon the bottom or touch the sides of
the circumferential grooves or channela on the chain wheels.
In another arrangement instead of employing a chain formed of links with
projecting pins as above described I use an endless band of suitable flexible.
material such as steel provided with suitable lateral projections adapted to take
into the slots or recesses between the teeth of the chain wheels.
I prefer to form the lateral studs or projections of reduced diameter where they
come in contact with the teeth of the wheels the diameter of the studs or
projections being gradually increased on each side of the teeth so that the chain
will always have a tendency to assume a position in which its links will
not touch the flanges or side portions of the wheels.
Driving mechanism such as described can be made very light without impairing
its durability or strength: at the same time the area of the points of frictional
contact is reduced to a minimum and there is no liability of mud or dust
collecting on or between the thin teeth of the chain wheels.
In the accompanying sheet of illustrative drawings. Fig. 1 is a side view of
the improved chain wheel.
Fig. 2 is a section in the line A B of Fig. 1.
Fig. 3 is a side view of a portion of the driving chain.
Fig. 4 is a plan view of a part thereof.
Fig. 5 is an elevation of a modification of the chain wheel.
Fig. 6 is a section in the line C D of Fig. 5.
Similar letters of reference indicate like parts in the several views.
a is the spindle which carries the chain wheel. b are the flanges or side
portions which form the circumferentially grooved or channelled periphery
of the chain wheel. The central portion of the wheel are in
arrangement pressed closely together (as shewn in Fig. 2) thus forming
one

page_text: the bottom of the groove or channel d. e are slots or openings formed by cutting
away parts of the flanges or side portions baud of the compressed parts c thus
allowing of the escape of any dust, mud, et cetera, which may fall into the
channel d. f are the slots or indents in the outer peripheries of the flanges which
form the alternate-recesses f and teeth f. g is a collar secured by any well known
means to the spindle of the chain wheel which fills up the hollow portion imme-
diately round the spindle and gives strength and rigidity to the wheel. are
the lateral studs or projections on the chain formed by making the transverse
pins that connect the links h of the chain together, project beyond the sides of
the said links to such an extent that they will overlap the teeth f' on the side
portions or edges of the periphery of the wheel and take into the slots or recesses f
between the teeth f. The lateral studs or projections where they come in
contact with the teeth of the wheel being of a reduced diameter, the diameter
gradually increasing on each side of the teeth so that the chain will always have
a tendency to assume a position in which its links will not touch the flanges or
side portions of the wheel. As shown in Figs. 3 & 4 the chain is so constructed
that its upper surface presents an almost continuous succession of openings which
readily allow any dust, mud, et cetera, to fall through into the circumferential
channel d and escape by the openings e in the bottom thereof.
In Figs. 1 & 2 the chain wheel is shewn formed by two discs of thin or sheet
metal pressed by any well known means to the required shape but it is evident
that the construction may be modified, as for example as shewn in Figs. 5 & 6
wherein the wheel is formed by two rings of thin or sheet metal i secured to the
body of the wheel by any number of spokes k of any suitable form. The dimen-
sions of the ends 7 of said spokes,, where they are secured to the rings forming
the channelled periphery, are such that the bottom of the circumferential groove
or channel d will be formed by the ends of the spokes : openings being left
in the bottom of the channel between the ends of the spokes thus allowing of the
free escape of any dust, mud, et cetera, which may fall through, or at the sides
of the links of the chain.
I am aware that heretofore chains have been constructed having transverse
pins on the sides thereof and I disclaim any right to the sole use of transverse
pins except in combination with chains and wheels as herein described.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what 1 claim is:-
1. In the driving gear of cycles, motor-cars and similar vehicles, the chain
wheel formed of two sheets of thin or sheet metal, with flanges b, slots or open-
ings e, as shewn in and described with reference to Figs. 1 & 2 of the accompanying
sheet of drawings, for the purposes specified.
2. In the driving gear of cycles, motor-cars and similar vehicles the chain
wheel composed of two rings of thin or sheet metal i, with spokes & having suitably
shaped ends as shewn in and described with reference to Figs. 5 & 6 of the
accompanying drawings for the purposes specified.
3. In the driving gear of cycles, motor-cars and similar vehicles, the links h,
with lateral studs or projections gl having a reduced diameter where they come
in contact with the teeth of the wheel as shewn in and described with reference
to Figs. 3 & 4 of the accompanying drawings for the purposes specified.
Dated this 30th day of June A.D. 1897.
CASIMIR A. BOUNEVIALLE.
James G. Stokes,
Agent for the Applicant.