A Detachable and Changeable Axle Chain Wheel for Cycles.
Year: 1893

page_text: Date of Application, 23rd Dec., 1893
Complete Specification Left, 28th Sept., 1894-Accepted, 3rd Nov., 1894
PROVISIONAL SPECIFICATION. .
A Detachable and Changeable Axle Chain Wheel for Cycles.
We WILLIAM ROBERTSON and JAMES ROBERTSON both of Albert Street,
Eccles near Manchester, Cycle Manufacturers, and J. & J. ROBERTSON, LTD. of
Albert Street Eccles do hereby declare the nature of this invention to be as
follows:-
(1) We make a chain wheel screwed with an internal thread through its centre.
(2) We make a bush with a hole through its ontre to fit axle. On the outside
of one end of bush we fit the crank for driving axle and chain wheel, on the other
end of the bush we make two threads and a collar, one of the threads being a left
and the other a right handed one. One thread is for the chain wheel to screw on
close up to collar, the other thread is for a lock nut. This bush being fitted into,
or solid, with the crank, the chain wheel being screwed on to and locked on the
bush, one key or cotter pin holds crank, hush and axle for driving with the above-
mentioned method. Chain wheels of various numbers of teeth with the above
named internal thread are each made to screw on the bush, thus making the chain
wheels changeable, and by screwing chain wheel up to collar with thread and
locked by lock nut having a reverse thread we thus secure the chain wheel and by
unscrewing lock nut and wheel we get a changeable and detachable axle chain
wheel for cycles.
Dated this Twenty-second day of December 1893.
WILLIAM ROBERTSON.
JAMES ROBERTSON.
J. & J. ROBERTSON, LTD.,
HY. FLEMING, Secretary.
COMPLETE SPECIFICATION.
A Detachable and Changeable Axle Chain Wheel for Cycles.
We, WILLIAM ROBERTSON and JAMES ROBERTSON both of Albert Street
Eccles near Manchester Cycle Manufacturers, J. & J. ROBERTSON LTD. of
Albert Street Eccles 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 :-
(1) We make a chain wheel screwed with an internal thread through its centre.
(2) We make a bush with a hole through its centre to fit axle. On the outside
of one end of bush we fit the crank for driving axle and chain wheel, on the other
end of the bush we make two threads and a collar, one of the threads being a left
and the other a right handed one. One thread is for the chain wheel to screw on
close up to collar, the other thread is for a lock out. This bush being fitted into,
or solid with the crank the chain wheel being screwed on to and locked on the
bush, one key or cotter pin holds crank, bush and axle for driving with the above-
mentioned method. Chain wheels of various numbers of teeth with the above
named internal thread are each made to screw on the bush, thus making the chain
wheels changeable and by screwing chain wheel up to collar with thread and
locked by lock nut having a reverse thread we thus secure the chain wheel and by
unscrewing lock nut and wheel we get a changeable and detachable axle chain
wheel for cycles.

page_text: Thus when key or cotter pin E is removed crank C chain wheel A bush G and
lock nut B are taken wholly apart from axle D we get a detachable axle chain
wheel.
And with the bush G being solid or fitted with crank C aud having a left and
a right handed thread F. & F. F. and lock nut B and chain-wheel A each fitting
their respective thread, then by unscrewing locknut B and unscrewing chain
wheel A-chain-wheel A now being wholly apart from bush G-it now admits
of changing with another chain wheel. We thus get a changeable axle chain
wheel.
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
1. The combination of a left and a right handed thread F & F. F on bush G
being fitted or solid with crank C in connection with a detachable or changeable
axle chain-wheel for cycles.
2. The combination of a left and a right-handed thread F. & F. F. on bush G
being fitted or solid with crank C and held by one key or cotter pin E in a
detachable or changeable axle chain wheel for cycles.
3. The combination of a chain wheel A. and a locknut B each being screwed on
to bush G with a left and a right-handed thread F. & F. F. or being screwed on
the same way with reverse threads-a right and left-and bush G being fitted or
solid with crank C and held for driving axle D by one key or cotter pin E in a
detachable and changeable axle chain-wheel for cycles.
Dated this Twenty-second day of September 1894.