Improvements in Driving Gear for Cycles and other Machinery and Mechanism.
Year: 1896

page_text: Date of Application, 14th Feb., 1896
Complete Specification Left, 28th Oct., 1896-Accepted, 19th Dec., 1896
PROVISIONAL SPECIFICATION.
Improvements in Driving Gear for Cycles and other Machinery
and Mechanism.
I JOHN PINNIGER Moss, of Neacroft, Ringwood, in the County of Hants,
Accountant, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in driving-gear for cycles and other
machinery or mechanism, and consists in providing a chain-wheel (which is loosely
mounted upon its axle so as to revolve independently thereof) having a flanged
rim, the inner periphery of which is indented or undulated so as to provide a
number of rounded teeth. Upon the axle aforesaid, is rigidly mounted a circular
disc or wheel upon the same side as the undulated flanged rim of the chain-
wheel, which disc carries upon its inner side which opposes the chain-wheel, a
number of pins projecting at right angles from such disc.
These pins act as pivots for a number of cam-like pawls the noses of which are
adapted to engage with the indentations between each of the rounded teeth upon
the inner periphery of the flanged rim of the chain-wheel.
A spring (or springs) is provided, such spring (or springs) preferably taking the
form of a flat india-rubber or other ring or it may be a disc, which surrounds the
axle and is located between the pawl-carrying disc aforesaid and the chain-wheel,
such spring being adapted to press against that surface of each cam-like pawl
which is toward the axle, and so maintain such pawls firmly against the undulated
flanged inner periphery of the chain-wheel. The outer periphery of said chain-
wheel is provided with the usual cogs or teeth to engage the rollers of the driving-
chain which connects the driving-gear with the mechanism or machinery to be
driven. It must be distinctly understood that the chain-wheel hereinbefore referred
to, is the wheel that bears the load, whether directly, or through the medium of
other mechanism.
The invention may be variously modified without departing from the spirit
thereof, as for instance, the pawls and spring (or springs) may be carried by the
chain-wheel, and the rounded teeth be formed upon the rim of the disc, instead of
the vice-versa arrangement before described.
The essential feature of the invention consists in dispensing with a rigid connection
between the load and the motive power; and substituting therefor a connection
maintained by a spring or springs pressing upon a number of undulations in or
near the rim of a wheel. This pressure is preferably conveyed by means of pawls
as described but could be conveyed by other means, such for instance as a piece
(or pieces) of metal fitting loosely in a radiating groove or grooves.
Dated this 14th day of February 1896
HUGHES, SON & Co.,
38, Chancery Lane, W.C., Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Driving Gear for Cycles and other Machinery
and Mechanism.
I JOHN PINNIGER Moss of Neacroft Ringwood in the County of Hants
Accountant 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 improvements in driving gear for cycles and other
machinery or mechanism, and consists in dispensing with the usual rigid connection
between the motive power and the load, and substituting for that rigid connection
one maintained by the resilience of a spring or springs acting on undulations in or
near the rim of a wheel connected either with the power or load.
This is effected by providing a chain wheel which is loosely mounted upon its
axle so as to revolve independently thereof, and having a flanged rim the inner
periphery of which is indented or undulated so as to provide a number of rounded
teeth. The power by which the machinery or mechanism is moved is applied to
turn the aforesaid axle. Upon the same axle there is rigidly mounted a circular
disc or wheel on the same side of the chain wheel as the undulated flange or rim;
which disc carries upon its inner side (which opposes the chain wheel) a number of
pins projecting at right angles from such disc. These pins act as pivots for a
number of camlike pawls the noses of which are adapted to engage with the
indentations between each of the rounded teeth upon the inner periphery of the
flanged rim of the chain wheel. The pawl carrying disc aforesaid is provided with
spring or springs located between the disc and the chain wheel; such spring or
springs being adapted to press against that surface of each camlike pawl which is
towards the axle, and so maintain the pawls firmly against the undulated inner
periphery of the flange of the chain-wheel. The outer periphery of the said
chain wheel is provided with the usual cogs or teeth to engage the rollers of the
driving chain which connects the driving gear with the mechanism or machinery to
be driven.
The invention may be variously modified without departing from the spirit
thereof; as for instance the pawls and spring or springs may be carried by the
chain wheel instead of being carried by the disc; and the rounded teeth may in
that case be formed upon or near the rim of the disc; instead of the vice versa
arrangement before described.
The following is the explanation of the drawing.
W is the chain wheel, having an inner undulated flange or rim, and the usual
cogs or teeth for engaging the rollers of the chain.
The drawing represents the chain wheel as having had its central part removed
in order to show the other parts of the mechanism.
A is the axle, turned by the power which puts the machinery or mechanism in
motion. K is the key by which the axle A is attached to the disc D.
Near the edge of the disc D are twelve pins fixed to the disc perpendicularly to
its surface and at equal distances from one another. These twelve pins are
represented in the drawing by a like number of circular spots (a).
Each pin acts as a pivot for a camlike pawl (P).
The nose of each pawl is represented as pressing against the inner undulated rim
or flange of the chain wheel W.
A spring (S) is represented by a thick curved line reaching from each of the
pawls to the axle A, so that the springs shown in the drawing are twelve in
number.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
(1.) The dispensing with the usual rigid connection between the motive power
and the load, and
(2.) Substituting for that rigid connection one maintained by the resilience of a
spring or springs acting on undulations in or near the rim of a wheel connected
with the power or load as the case may be.
Dated this Twenty-seventh day of October 1896.
JOHN PINNIGER MOSS.