AN IMPROVED METHOD OF OBTAINING A VARIATION IN THE SPEED OF VELOCIPEDES to be as follows:-
Year: 1885

page_text: We THEOPHILUS JOHN SALWEY, of The Guildhall, Solicitor, and CHARLES
FORTEY of Abbey Villa Gentleman, both in Ludlow in the County of Salop, do
hereby declare the nature of our said invention for "AN IMPROVED METHOD OF
OBTAINING A VARIATION IN THE SPEED OF VELOCIPEDES to be as follows:-
"
We fit onto the driving axle a "balance gear" of any suitable type, and fix on
the case of the same, two spur wheels of different diameters. A space is left
between these wheels slightly exceeding the width of both of the wheels for a
purpose that will presently be made clear. This space is used as a brake drum for
the strap brake. On the pedal crank axle we fix a spur wheel of extra width,
slightly exceeding three times the width of the spur wheels on the driving axle.
On an intermediate axle we mount loosely two spur wheels fixed close together.
The sizes of these spar wheels are controlled by the sizes of those on the driving
axle, and they are arranged so that the larger one on the intermediate axle will
gear with the smaller one on the driving axle, and the smaller one on the inter-
mediate axle with the larger one on the driving axle, when the double wheel is
moved laterally on its axle to bring them in gear. The space between the two
spur wheels on the driving axle permits the double spur wheel on the intermediate
axle to be placed centrally between the two so that the pedal crank axle will be
free. From this position it may be moved to the right or left to gear with one or
other of the spur wheels on the driving axle, to gear the machine up or down as
greater or less speed or power is required. The larger spur wheel on the inter-
mediate axle gears with the spur wheel on the pedal crank axle and owing to the
extra width of the latter it never gets out of gear with it, notwithstanding the
lateral movement of the intermediate wheel. The various sizes of the spur wheels
depend entirely upon the extent and variation of speed or power required, and they
may be varied without departing from the principle of our invention.

page_text: The lateral movement of the intermediate double wheel is controlled by a
suitable sliding clutch and hand lever, or by any other convenient arrangement.
The intermediate axle is mounted in a suitable frame and may be either a stud
axle with the wheel running loosely on it, or it may be a revolving axle with the
axle moving in the bearings, or the double wheel moving on a feather on the
axle, as is found most convenient. In using the latter arrangement we sometimes
connect the pedal crank axle with the intermediate axle by an endless driving
chain running over a pair of chain wheels.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer & Patent Agent,
Royal Courts Chambers,
70, 71, & 72, Chancery Lane, London, W.C.,
Agent for the Applicants.
1

page_text: отостреаев.
We THEOPHILUS JOHN SALWEY of The Guildhall, Solicitor and CHARLES
FORTEY of Abbey Villa Gentleman, both of Ludlow in the County of Salop do
hereby declare the nature of our said invention for "AN IMPROVED METHOD OF
OBTAINING A VARIATION IN THE SPEED OF VELOCIPEDES "and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
We fit on to the driving axle a "balance" gear of any suitable type, and fit on
the case of the same, two spur wheels of different diameters. A space is left
between these wheels slightly exceeding the width of both of the wheels for a
purpose that will presently be made clear. This space may be used as a brake drum
for the strap brake. On the pedal crank axle we fix a spur wheel of extra width,
slightly exceeding three times the width of the spur wheels on the driving axle.
On an intermediate axle we mount loosely two spur wheels fixed almost close
together. The sizes of these spur wheels are controlled by the sizes of those on the
driving axle and they are arranged so that the larger one on the intermediate
axle will gear with the smaller one on the driving axle, and the smaller one on the
intermediate axle with the larger one on the driving axle, when the double inter-
mediate wheel is moved laterally on its axle to bring them in gear. The space
between the two spur wheels on the driving axle permits the double spur wheel
on the intermediate axle to be placed centrally between the two on the driving
axle, so that the pedal crank axle 'may be used as a foot rest. From this position
the intermediate wheels may be moved to the right or left to gear with one or
other of the spur wheels on the driving axle, to gear the machine up or down,
as greater, or less speed or power is required. The large spur wheel on the inter-
mediate axle gears with the spur wheel on the pedal crank axle, and owing to the
extra width of the latter it never gets out of gear with it notwithstanding the lateral
movement of the intermediate wheel. The various sizes of the spur wheels depend
entirely upon the extent, and variation, of speed or power required, and they may
be varied without departing from the principle of our invention.
The lateral movement of the intermediate double wheel is controlled by a
suitable sliding clutch and hand lever, or by any other convenient arrangement.
The intermediate axle is mounted in a suitable frame and may be either a stud
axle with the wheel running loosely on it, or it may be a revolving axle with the
axle moving in the bearings, or the double wheel moving on a feather on the axle,
as is found most convenient. In using the latter arrangement we sometimes
connect the pedal crank axle with the intermediate axle by an endless driving
chain running over a pair of chain wheels.
Having now generally described and ascertained the nature of our said invention,
we will more particularly describe it with the aid of the accompany drawings, on
which similar parts are marked with like letters of reference.
Fig. 1 is a side elevation of our gear, and Fig. 2 a front elevation thereof.
Referring to these figures, A and A¹ designate the two spur wheels of different

page_text: diameters mounted on the driving axle B, and connected therewith by any suitable
form of differential or "balance" gear. The space a provided between the spur
wheels A and A¹ may be used as a brake drum. O designates the broad spur
wheel fixed to the pedal crank axle D, and E designates the double intermediate
spur wheel running loosely on the intermediate stud axle F, so that it may be
placed in gear with either of the spur wheels A or A¹ on the driving axle B, or
may be placed centrally between them in the clearance space a, so that the pedals
may be used as footrests. A convenient method of controlling the position of the
double intermediate wheel E is to mount it loosely on a collar f which is free to
slide laterally on the axle F, but not to revolve on it. Attached to the sliding
collar fis a rack f¹ with which gears a small pinion ƒ mounted on a vertical rod fa
which is carried in suitable bearings on the frame, and is provided with any con-
venient form of manipulating handle by which it may be turned for the purpose of
sliding the intermediate wheel E laterally on its axle, to gear it with one or other
of the spur wheels A and A¹.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
First. The combination and arrangement of the gearing as, and for the purpose,
hereinbefore described and shown.
•
Secondly. A driving gear for imparting motion from one axle to another,
consisting essentially of the two spur wheels A. and A¹, the wide spur wheel C, and
the intermediate double spur wheel E all combined, and operating, as and for the
purpose, hereinbefore set forth.
er 1885.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer & Patent Agent,
Royal Courts Chambers,
70, 71, & 72, Chancery Lane, London, W.C.,
Agent for the Applicants.
Dated this 12th day of December 1885.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer & Patent Agent,
Royal Courts Chambers,
70, 71, & 72, Chancery Lane, London, W.C.,
Agent for the Applicants.