Improvements in Chain Gearing.
Year: 1895

page_text: Date of Application, 14th June, 1895
Complete Specification Left, 5th Dec., 1895-Accepted, 18th Jan., 1896
PROVISIONAL SPECIFICATION.
Improvements in Chain Gearing.
I, WILLIAM SPEIRS SIMPSON of 49 Battersea Park Road, London Civil
Engineer do hereby declare the nature of my said invention to be as follows:-
This invention relates to improved means and appliances for increasing or
decreasing rotation of gears from lever chain gear motion and is an improvement
upon a prior application of mine dated 17th December 1894 No. 25150.
The present invention consists in arranging the same kind of gear in supple-
mentary order to enable increased or decreased speed to be obtained according to
the arrangement of the gear wheels and tongued chains.
As an example of my present invention I arrauge, say, a six inch wheel to drive
by the chain tongues an eight inch driver, and this in its turn by its gear tongues
can actuate a ten inch intermediate wheel for operating a twelve inch driven gear
by which the drive or main bearing wheel can be driven.
Or a ten inch tongued gear can operate an eight or a six inch wheel for
transmitting the motion to a four inch tongue driver on the axle of the driver
wheel.
This invention is not limited to cycle driving but is applicable for all kinds of
mechanism in or to which such a combination of gear can be found useful.
1
Dated this 14th June 1895.
H. GARDNER,
Patent Agent, 166 Fleet Street, London, Agent for W. S. Simpson.
Improvements in Chain Gearing.
I, WILLIAM SPEIRS SIMPSON, of 49 Battersea Park Road, London, Civil
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 :-
This invention relates to improvements in chain gearing and is an improvement
upon a prior application of mine dated 17th December 1894, No. 25150.
The present invention consists in arranging the same kind of gear in supple-
mentary order to enable increased or decreased speed to be obtained according to
the arrangement of the gear wheels and tongued chains.
As an example of my present invention and as represented in the annexed
drawings, Figure 1 side view. Figure 2 plan. Figure 3 detached gear wheel.
1 arrange, say an eight inch wheel A of the pedals to drive by the chain tongues B, B,
a six inch driver on the axle of which is an eight inch wheel D carrying a
duplicate chain B' and this in its turn by its gear tongues actuates a six inch
driven gear E by which the drive or main bearing wheel F can be driven. Or a
ten inch tongued gear can operate an eight or a six inch wheel for transmitting the
motion to a four inch tongue driver on the axle of the driven wheel.
This invention is not limited to cycle driving although I have so shown it but is

page_text: applicable for all kinds of mechanism in or to which such a combination of gear
can be found useful.
As fitted to a cycle I form a boss G with eye on the back-fork H through which
the spindle of the intermediate gear is arranged, the_tongue gear wheel C being
between the fork and drive wheel and the sprocket D on the outside from which
the tongue gear wheel E can be operated without increasing the width of the
machine and without interfering with the existing pedal appliances.
'The
intermediate tongue gear wheel C and its sprocket D can be in the same casting
as shown by Figure 3, and may be outside the fork H if used with a cycle.
The frame of the machine is of the usual kind but I represent what is known as
a diamond frame, I being the back stay, J the centre stay, and K part of the
lower main tube.
Having now particularly described and ascertained the nature of this inven-
"tion and in what manner the same is to be performed I declare that what 1
claim is:-
1. The combination of two tongued chains between the pedal or driver gear and
that of the driven gear by the employment of an intermediate tongue and sprocket
gear wheels as described and substantially as represented in the drawings for the
purpose or purposes set forth.
The 5th day of December 1895.
H. GARDNER,
Patent Agent, 166. Fleet Street, London,
Agent for the said William Speirs Simpson.