Improvements in Chain Gearing especially suitable for Velocipedes.
Year: 1895

page_text: Date of Application, 26th Oct., 1895
Complete Specification Left, 27th July, 1896-4ccepted, 29th Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in Chain Gearing especially suitable for
Velocipedes.
We, ROBERT FOSTER RIMMINGTON of 6 Cliff Terrace, Hartlepool, in the
County of Durham, and JAMES ALFRED RIMMINGTON of Ingmanthorpe,
Babington Road, Streatham in the County of Surrey, Gentlemen do hereby
declare the nature of this invention to be as follows:
-
According to this invention the chain carries projecting pins or teeth which
enter holes in the curved surface of the rim of the wheel without touching the
edges. This rim is hollow and has within it friction balls or loose rollers against
which the teeth bear. Abutments either fixed or consisting of other balls or rollers
are provided to keep the balls or rollers in place.
Deted this 25th dow of Ontober 1905
R. F. RIMMINGTON.
J. A. RIMMINGTON.
Improvements in Chain Gearing especially suitable
Velocipedes.
Ior
We, ROBERT FOSTER RIMMINGTON, of 6 Cliff Terrace, Hartlepool, in the
County of Durham, Gentleman, and JAMES ALFRED RIMMINGTON, of Ingman-
thorpe, Babington Road, Streatham, in the County of Surrey, 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 a new or improved system of chain gear wheels
whereby the friction which exists between the ordinary chain and teeth of gear
wheels is reduced with a saving in power transmitted.
For this purpose the gear wheels are provided with loose friction balls or loose
rollers suitably chambered on the periphery of the wheel.
The loose friction balls or loose rollers project on the front side of the hollow
chambers or teeth of the wheel engaging with the chain thus obtaining a rolling
surface between the moving chain and wheel.
Figure 1 is a side elevation of a chain wheel in accordance with our invention.
Figure 2 is a transverse section of the same. The driving chain is also shown in
these figures and a plan of the portion of the driving chain is shown in Figure 3.
Figures 4, 5 and 6 are similar views and show a modification.
Figures 7 and 8 show another way of confining the loose balls or loose rollers in
the chambers of the wheel.
In Figures 1, 2 and 3, a is the body of the wheel, it has teeth a' a¹ and in the
leading faces of the teeth are cavities in which are placed the hard steel balls b b.
The balls are inserted from the side of the wheel and are kept in the cavities by
side plates a² a² which are fixed to the body of the wheel by pins or rivets a³ a³.

page_text: In Figure 1 a portion of one of the side plates is broken away. The balls project
in front from the cavities in the teeth through apertures which however do not
admit of the balls passing out through them. The chain consists of single and
double links c and d arranged alternately and connected by pins or rivets in the
usual manner.
The single links c have projections which enter between the
teeth of the wheel coming into contact only with the projecting faces of the balls b
whilst the two ends of the links c rest upon the summits of the teeth a'. S the
n heel as it revolves drives the chain or the chain in its travel drives the wheel as
the case may be.
)
In Figures 4, 5 and 6 the arrangement is modified so that the single links e of
the chain may enter between the teeth a' of the wheel and abut at their ends
against the balls b.
The chambers or cavities in the wheel also are somewhat differently formel so
that one side plate a³ only is needed.
Figure 7 is a side view partly in section shewing an arrangement which admits
of the balls being inserted from the front of the cavity; a link of the chain is
also indicated in this figure; Figure 8 is a section on the line 8, 8, in Figure 7.
e is a wedge which is inserted after the ball is in place, it is driven into a groove
prepared for it in the rim of the wheel; it partially closes the mouth of the cavity.
f is a hard steel disc to serve as an abutment for the ball, it is inserted
into the cavity before the ball is entered. The side ring a² keeps the wedges in
place.
Sometimes in place of balls we employ rollers of cylindrical form with globular
or conical ends.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. The combination of a chain with a chain wheel having cavities in the teeth
and loose rolling parts in the cavities.
2. The combination of a chain having horns projecting radially inwards with a
chain wheel having cavities in the teeth and loose rolling parts in the cavities.
3. A chain wheel having cavities in the teeth closed on five sides but partly
open on the sixth or leading side and loose rolling parts in the cavities of greater
diameter than the width of the openings and projecting out through them.
4. A chain wheel having cavities in the teeth closed on five sides but partly
open on the sixth or leading side, one side of each cavity being part of an annular
plate concentric with the wheel and loose rolling parts in the cavities of greater
diameter than the width of the openings and projecting out through them.
5. The combination of a chain with a chain wheel having cavities in the teeth
closed on five sides but partly open on the sixth or leading side and loose rolling
parts in the cavities of greater diameter than the width of the openings and
projecting out through them.
6. The combination of a chain having horns projecting radially inwards with a
chain wheel having cavities in the teeth closed on five sides but partly open on the
sixth or leading side and loose rolling parts in the cavities of greater diameter than
the width of the openings and projecting out through them.
7. The combination of a chain with a chain wheel having cavities in the teeth
closed on five sides, but partly open on the sixth or leading side, one side of each
cavity being part of an annular plate concentric with the wheel and loose rolling
parts in the cavities of greater diameter than the width of the openings and
projecting out through them.
8. The combination of a chain having horns projecting radially inwards with a
chain wheel having cavities in the teeth closed on five sides, but partly open on the
sixth or leading side, one side of each cavity being part of an annular plate
concentric with the wheel and loose rolling parts in the cavities of greater diameter
than the width of the openings and projecting out through them.

page_text: 9. A chain wheel with cavities in the teeth, rolling parts in the cavities and
wedges in front of the rolling parts confining them in the cavities.
10. Chain gearing substantially as described and shown in the drawings.
Dated this 24th day of July 1896.
ROBERT FOSTER RIMMINGTON.
JAMES ALFRED RIMMINGTON.