Improvements in Sprocket Wheels for Cycles and other Vehicles.
Year: 1898

page_text: IONAL DIECIFICATION.
Improvements in Sprocket Wheels for Cycles and other Vehicles.
I, EDWARD RICHARD SALWEY, of Stonehouse Court, Stonehouse, in the County
of Gloucester, Civil Engineer, do hereby declare the nature of this invention to be
as follows:-
This invention relates to the sprocket wheels of cycles and other vehicles and
has for its object the provision of a means whereby the crank spindle may be
thrown in and out of gear with the sprocket wheel while the cycle is in motion.
It consists of a circular boss which is attached to the crank spindle and carries
on its outer circumference a ring of metal which is free to rotate, and on which are
cut the sprocket teeth for the chain. One or more radial holes are provided in
the circular boss in which spring bolts are fitted, which are free to engage with
corresponding holes or slots cut on the inside of the outer ring of metal. The
heads of these bolts are made wider and project beyond the sides of the holes or
slots in the outer ring of metal, and by the use of band brake, or other suitable
means, they can be depressed within the circular boss and disengaged from the
outer ring of metal.
In ordinary working the band brake is free, and the drive is communicated
from the crank spindle to the outer ring of metal through the spring bolts.
By tightening the brake, the bolts are withdrawn and the crank spindle is
instantaneously thrown out of gear, thus leaving the feet at rest.
Improvements in Sprocket Wheels for Cycles and other Vehicles.
I, EDWARD RICHARD SALWEY, Civil Engineer, of Stonehouse Court, Stonehouse,
in the County of Gloucester, 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 the sprocket wheels of cycles and other vehicles and
has for its object the provision of a means whereby the crank spindle may be
thrown in and out of gear with the sprocket wheel while the cycle is in motion.
It consists (Figs. 1 & 2) of a circular boss A which is attached to the crank
spindle B, and carries on its outer circumference a wheel C which is free to rotate,
and on which are cut, the sprocket teeth D, D, for the chain. One or more radial or
parallel holes E, E are formed in the circular boss A, in which a spring bolt F
Price 8dı

page_text: is fitted on the end of which teeth are cut; and the spring G, G, tend to force F,
outwards and cause it to engage with the corresponding teeth H, H which are cut
on the inside of the wheel C. This bolt F is made of such a shape that the head is
wider than the wheel C and projects beyond its face into a groove J, which is
formed in the central boss A. By the use of a loop of steel K, made in the form of
a band brake, or by other suitable means, the spring bolt F can be depressed
within the circular boss A & disengaged from the teeth H, H, & the wheel C is
then free to rotate.
In ordinary working the loop K is free, and the drive is communicated from the
central boss, A. to. the wheel C, by the spring bolt. 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 sprocket wheels the combination of a central boss which is attached to
the crank spindle, and a chain wheel which is free to revolve on same,. substantially
as described and particularly shown in Figs. 1 & 2.
(2) The application of a spring bolt to couple the sprocket wheel to the crank
spindle substantially as described and particularly shown in Figs. 1 & 2.
(3) The application of a band brake for the purpose of disengaging the spring
bolt from the sprocket wheel substantially as described and particularly shown
in Figs. 1 & 2.
Dated this Tenth day of October 1898