Improvements in or relating to Driving Mechanism for Cycles and other purposes.
Year: 1898

page_text: Date of Application, 2nd Dec., 1898
Complete Specification Left, 2nd Oct., 1899-Accepted, 4th Nov.,
1899
PROVISIONAL SPECIFICATION.
Improvements in or relating to Driving Mechanism for Cycles and
other purposes.
FREDERICK CROSBY, 12, Herne Villas, Forest Hill, London, S.E., Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention consists in the improved method of placing and the arrangement
of a spring or springs, a pawl or pawls, and a ratchet wheel. The wheel as
arranged in my invention consists of an outer wheel or rim and an inner wheel
with the mechanism between them, with a plate or casing on each side attached
to the outer wheel or rim and covering the junction between the outer and
inner wheels, in such a way that the wheel is free to revolve in its entirety
when turned in one direction, but so that the outer portion alone may revolve
when turned in the opposite direction. The outer wheel or rim has a channel
or groove cut away around the surface of its inner diameter, in which channel
one, two, or more springs are rivetted, screwed, or otherwise affixed in such a
way that while one end of the spring is sunk within the channel, the other end
protrudes outside it except when pressed within the channel. At various (leter-
mined portions of the inner diameter of the wheel, one, two, or more slots or
gaps are cut away, the number of slots being the same as the number of springs
used. A pawl is fitted in each slot, the said pawl being provided with trunnions
at or near the end. The inner wheel is adjusted within the outer wheel or rim
and has ratchet teeth on its outer diameter, these teeth being arranged to engage
with the pawl or pawls fitted in the slots in the outer wheel or rim, and the
whole is enclosed by plates at each side, the plates being screwed or otherwise
affixed to the outer wheel, and having suitable holes or bearings to admit the
trunnions at the side of the pawl or pawls for the purpose of withdrawing the
same from the slots when the wheel is revolving in one direction, the pawls
being forced out of the slots by the action of the spring. The inner wheel and
the covering plates are bored in the usual way to form a bearing.
1000
A. G. PRITCHARD,
21, Jeffreys Road, Clapham, S.W.,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Driving Mechanism for Cycles and
other purposes..
I, FREDERICK CROSBY, of 12, Herne Villas, Forest Hill, London, S.E., 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:―
My invention relates to clutch gearing designed more especially for use either
on the hub of the driving wheel or on the crank axle of a velocipede but it is
applicable to ratchet braces, hydraulic jacks and other purposes.

page_text: In the accompanying drawings, which illustrate the application of my inven-
tion to the driving wheel of a velocipede,
Figure 1 is a sectional elevation,
Figure 2 is a transverse section, and
Figure 3 is a detail.
The clutch gear, as arranged in my invention, consists of an outer wheel or
rim a and an inner wheel 6 with the mechanism between them and plates or
casings c and d at the two sides attached. to the outer wheel or rim a and cover-
ing the junction between the parts a and b in such a way that the mechanism
revolves in its entirety when turned in one direction but SO that
the part a may revolve independently of the part when the said part a is
stopped. The part b is screwed on to the wheel hub and it may have two holes
or slots in it for the engagement of a pin wrench to facilitate removal. The
part a has a channel or groove e cut away around its inner surface or instead of
one annular groove a number of segmental depressions may be suitably formed
therein. Within this groove or channel e are fixed the requisite number of
springs f. These springs may be pin-springs as shown or they may be strip
or other springs and they are rivetted, screwed or otherwise affixed in such a
way that they can lie within the said groove or channel e. At one or more
determined points of the inner surface of the part a, slots or gaps 9 are cut away,
the number of gaps being equal to the number of springs used. A pawl h
provided with trunnions (see Figure 3) is fitted in each gap g. The part b
is adjusted within the part a and has ratchet teeth j on its periphery, these teeth
being arranged to engage with the pawls h fitted in the gaps g and the whole is
enclosed by the plates c and d the said plates being screwed together by screws d¹
or otherwise affixed to the part a and having suitable holes or bearings to receive
the trunnions i.
It will be seen that the portions b¹ of the part 6 form frictional bearings for
the part a, but alternately ball or roller bearings may be mounted at those or
other points. Instead of the pawls being shaped as shown in the drawings they
may be of block, roller, ball or other shape.
The springs are buried within the groove e and tend to force the pawls g
towards the axis of rotation and in engagement with the ratchet teeth j. When
power is communicated to the outer part a and the same rotated in the direction
of the arrow in Figure 1 there will be positive engagement between the parts a
and 6 through the intervention of the pawls h but when, after movement, the
part a is held stationary the part 6 is still free to rotate, the ratchet teeth raising
the pawls against the influence of the springs f.
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 clutch gear the groove e wherein springs may be buried substantially
as set forth.
2. The combination, in a clutch gear, of an inner and an outer member with
engaging mechanism between them, one member being provided with ratchet
teeth and the other with a groove and spring buried therein substantially as
set forth.
3. The improved driving mechanism for cycles and other purposes substantially
as set forth and illustrated in the accompanying drawings.
11
LARK
PURCIN GILI
A. F. SPOONER,
323, High Holborn, London,
Agent for the Applicant.
A. F. SPOONER,
323, High Holborn, London,
Agent for the Applicant.