provements in and relating to Driving Mechanism for Velocipedes.
Year: 1897

page_text: PROVISIONAL SPECIFICATION
Improvements in and relating to Driving Mechanism for Velocipedes.
I, JAMES FORBES, of 623, Fulham Road, Fulham, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention to be as follows:-
-
This invention relates to an improvement in pedal driving gear for veloci-
pedes, and it consists in connecting the driving chain wheel on the pedal-crank
axle with the said axle by means of an improved clutch which will not only
permit motion to be imparted to the driving chain wheel from the crank axle
in both a forward and rearward direction but will also allow the pedals to be held
at a state of rest when the machine is running forward.
The improved clutch consists essentially of a disc fixed to the pedal-crank
axle and in the periphery of which is a recess forming two inclined planes in-
clining in opposite directions, and of a flanged box forming the driving chain
wheel.
In the recess in the periphery of the disc on the axle is placed a ball or roller
which when the axle is moved in either direction becomes jammed between one of
the inclined planes in the periphery of the disc and the outer wall of the flanged
box forming the chain wheel and so imparts motion to the said chain wheel in
the direction in which the pedal crank axle is rotating, while if the cranks are
held stationary the ball or roller becomes released and lies at rest in the deepest
part of the recess in the discs on the axle and thus allows the chain wheel to
overrun it, the position of the recess forming the inclined planes of the disc with
respect to the driving cranks being such that when the cranks are in the hori-
zontal plane the said recess is in a suitable position to allow the ball or roller to
lie at a state of rest.
According to a modified construction a double recess is formed in the periphery
of the disc on the axle the said recesses being arranged side by side each ex-
tending only half through the thickness of the disc so that the inclined planes
overlap one another, which causes the balls or rollers-one in each recess-to
come into engagement quicker thus reducing the amount of backlash between
forward and rear driving.

page_text: improvements in and relating to Driving меспаnism ior velocipedes.
I, JAMES FORBES, of 623, Fulham Road, Fulham, in the County of Middlesex,
Engineer, 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 relates to an improvement in pedal driving gear for veloci-
pedes, and it consists in connecting the driving chain wheel on the pedal-crank
axle with the said axle by means of an improved clutch which will not only
permit motion to be imparted to the driving chain wheel from the crank axle
in both a forward and rearward direction but will also allow the pedals to be held
at a state of rest when the machine is running forward.*
In the accompanying drawing which illustrates one form my invention may
assume.
Figure 1 is a view in side elevation showing the clutch with its covering plate
removed and
Figure 2 is a view in section on line - of Figure 1.
Throughout both views similar parts are marked with like letters of reference.
The improved clutch consists essentially of a disc A fixed to the pedal-crank
axle X and in the periphery of which is a recess a forming two inclined
planes a¹ inclining in opposite directions, as shown and of a flanged box B
carrying the driving chain wheel Y.
In the recess a in the periphery of the disc A on the axle X is placed a ball
or roller C which when the axle is moved in either direction becomes jammed
between one of the inclined planes at in the periphery of the disc and the outer
wall of the flanged box B carrying the chain wheel Y and so imparts motion
to the said chain wheel in the direction in which the pedal crank axle is rotating,
while if the cranks are held stationary the ball or roller C becomes released and
lies at rest in the deepest part of the recess a and thus allows the chain wheel. Y
to overrun it, the position of the recess a forming the inclined planes a¹ a¹ of
the disc A with respect to the driving cranks being such that when the cranks are
in the horizontal or approximately in the horizontal plane the said recess a is in
a suitable position to allow the ball or roller C to lie at a state of rest.
To take off some of the strain and prevent undue wear on the roller C when
the cranks are driving the pedal crank axle X in a forward direction I prefer
to arrange other recesses a³ a² in the periphery of the disc A forming inclined
planes each in the same direction so arranged that the balls or rollers C¹ C¹
contained therein will only jamh with the outer wall of the box B when motion
is imparted to the chain wheel in a forward direction.
The box B is fitted with a suitable cover b¹ to keep the balls or rollers C
and C in their respective recesses and to prevent the ingress of dirt and dust
to the moving parts.
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:-
T
(1). In a pedal driving gear for velocipedes connecting the driving chain
wheel on the pedal crank axle with the said axle by means of a clutch consisting
essentially of a disc fixed to the said axle and having in its periphery a recess
forming two inclined planes inclining in opposite directions in which is placed
one or more balls or rollers which in certain positions is adapted to jamb with

page_text: the wall of a flanged box carrying the chain wheel, substantially as described
and shown.
(2). In a pedal driving gear. for velocipedes connecting the driving chain
wheel on the pedal crank axle with the said axle by means of a clutch, con-
structed substantially as herein before described.
Dated this 13th day of Avonit 1808
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Chartered Patent Agent.
70, Chancery Lane, London, W.C., Agent for the Applicant.