Improvements in Bicycle Gear and Construction.
Year: 1892

page_text: Date of Application, 25th July, 1892-Accepted, 24th Sept.. 1892
COMPLETE SPECIFICATION.
Improvements in Bicycle Gear and Construction.
I JAMES WALTER MOTTRAM of 105 Weston Street Sheffield in the County
of York Coach Builder 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 bicycle gear and its object is to arrange means
whereby a quick or slow driving gear may be put into motion or the gearing
may run free at the will of the rider to attain this I arrange the hind or driven
wheel of the bicycle in the manner set forth in the accompanying sheet of drawings
in which Fig. 1 is a cross sectional elevation of the centre or hub part of my said
wheel and Fig. 2 is a plan of same showing my improvements.
Similar letters of reference denote corresponding parts in each view.
The axle A of the said wheel I form hollow or partly so and place or arrange
therein a spindle or rod B.
Vertically through the axle A and in a position situated between the hubs C
I form a slot or hole a' and I place a bar or key D through the same with its centre
part fitting into a slot or hole formed in the spindle or rod B and its ends are formed
to receive screws or pins for the purpose hereinafter described.
A bolt E is secured in a horizontal position to the upper end of the bar or key D
by means of the pin or screw d' and a bolt E' is similarly secured to the opposite
or lower end of said bar D.
The end of bolt E bears in a hole el formed in the hub C which latter is made
wider or thicker at in order to give sufficient bearing to said bolt. The end of
bolt E bears likewise in a hole c' formed in the opposite hub C.
I employ two chain pinions H which fit loosely on the axle A and bear between
the hubs and the bearings K. The web parts of said chain pinions F have any
suitable number of holes to correspond with the holes c. By causing the
spindle B to travel to the right or to the left the bolt E or bolt E enters one of
the holes in either the right or left chain pinion H so putting it into gear or
securing it to the boss or nave of wheel. Each chain pinion His coupled or geared
up by a chain to a driving pulley fitted or secured to the treadle driving shaft of
the machine or bicycle. Each said driving pulley differs in size or diameter so that
when the right hand chain pinion is fastened by pin E a slow driving gear may
be the result and when the pin or bolt E' is in the left side chain pinion H a quick
driving gear may be the result or vice versa as may be arranged, and when the
bolts E and E are in position shown the gearing is free and the pinions H will run
loose on the axle A. The movement of the rod B may be perforined by means of
a bell crank M working on a bracket I made with or fitted to the frame K and
said bell crank may be moved by a rod O which may extend to any suitable part
of the bicycle in order to be operated by the rider's haud in any convenient
manner.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
1. In bicycle gear the use of a rod or spindle B working horizontally in the
axle A. of the geared or driven wheel and operating one or more bolts E or E'
which are situated between the hubs C and are arranged to enter in or withdraw
from holes formed in the chain pinions H substantially as described and
illustrated.
2. In bicycle gear the use of a rod or spindle E working in the centre of the

page_text: axle A and operating bolts E or E' substantially as described and used for the
purpose specified.
3. In bicycle gear forming holes c' in the hubs C of the driven wheel for the
reception of bolts E or E in order to secure the chain pinion or pinions H to
the nave of wheel as described.
A
1
CT 1
H. F. BOUGHTON, M.I. Mech. E.,
Commercial Street, Sheffield, Agent.
H. F. BOUGHTON, M.I. Mech. E.,
Commercial Street, Sheffield, Agent.