Improvements in connection with Chains and Chain Wheels Used with Cycles.
Year: 1894

page_text: Date of Application, 27th Dec., 1894
Complete Specification Left, 23rd Jan., 1895-Accepted, 23rd Feb., 1895
PROVISIONAL SPECIFICATION.
Improvements in connection with Chains and Chain Wheels Used
with Cycles.
I, WILLIAM SPEIRS SIMPSON, of 49 Battersea Park Road, London, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for object, certain improvements in connection with chains
and chain wheels used with cycles in order that power exerted in driving can be
Considerably reduced, consequently with less fatigue to the idei.
The invention also admits of its application to existing machines.
To carry my invention into practice, I make a chain of the Vanca uson type,
euch alternate Ink having studs or projections on their une edges, and with
long tails on their outer edges, these latter having then ends connected by cross
pins which project from either side.
I make the periphery of the pedal drive wheel with notches, and I provide the
hub of the drive wheel with projections, said hub having a loose fitting and
grooved collar o ring on which the chain can bear and un ficely.
In action, the chain is driven from its inner edge by the studs engaging in the
periphery notches of the pedal cham wheel but the hub of the dive wheel is
diven by the projecting ends of the cross pms engaging the teeth of the hub at a
greater distance than usual from the axle for obtaining increase of leverage.
Dated the 97th day of December 1894.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said William Speirs Simpson.
Improvements in connection with Chains and Chain Wheels Used
with Cycles.
1, 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
-1
This invention has for object, certain improvements in connection with chains
and chain wheels used with cycles in order that power exerted in driving can be
considerably reduced, consequently with less fatigue to the der.
I make the periphery of the pedal drive wheel with notches, and I provide the
hub of the driver wheel with projections, said hub having a loosely fitting and
grooved collar or ing, on which the chain can beat and run treely.
My invention is clearly represented in the annexed sheet of drawings.
Figure 1 is an elevation.
Figure 2 a plan of my improved cham.
1

page_text: Figure 6 represents the position of the links on the pedal dive goal wheel.
Figure 7 the chain on the rear drive wheel hub.
Figure 8 elevation of machine.
Figure 9 plan edge view of pedal chain wheel with recesses at side edges.
Figure 10 plan of similar wheel with centre recesses and two loose ungs at
outor edges.
Figure 11 plan edge view of rear hub with loose cential ring forming side
grooves.
Figure 12 section of same.
Figure 13 plan of similar hub with loose ng provided with central anuular
groove.
Figure 14 represents a similar hub with notches in the periphery of the loose
ring.
Ä, A, are links, B, B, studs therefiom on the inner edges. C, C, long tails as
outer extension of same. D, D, cross pins with their ends E, E, projecting from
either side. F, F, intermediate links.
The two sets of links A, F, are coupled and articulated on pivot pins G, G,
like the ordinary Vaucauson chain links used with cycles If the links A have
plain bottom edges, the studs B are upon the links F, as at Figure 4. The above
named links constitute the first part of my invention. The studs B, B, on the
links A, A, engage in the edge notches H, II, of the gear wheel J, Figures 6
and 9, for being pulled round under the action of the pedals K but if the
studs B, B, be on the intermediate links F, F, they engage in a differently
constructed or modified shape of wheel L, Figure 10, and into central
notches H, H. In the first case, the plain lower edges of the intermediate links
bear upon the plain central part of the wheels periphery, Figuro 9. The
studs B, B, in the second case engage in the central notches H, H, of the gear
wheel, Figure 10, and the plain bottom edges of the links A, A, rub on loose
rings M, M.
The chain on the rear wheel N rides freely on a loose ung P of the hub Q but
the cross pins E, E, engage against teeth R, R, forming part of the hub, the
distance from the centre S of the axle being so arranged that it offers great
leverage to pull the rear dive wheel N thereby reducing the labour of the rider
considerably.
Figures 11, 12, 13, 14 represent the forms of loose rings P to suit the studs B
on the links A oi F accordingly.
Having now particularly described and ascertamed the nature of this inven
tion and in what manner the same is to be performed declare that what 1
claim 18:-
In a cycle chain, the links A with studs B, tails C, cross pins D having
projecting ends E, as and for the purposes described.
2. In a cycle chain wheel, the loose ring P on hub Q of diving wheel, said hub
having teeth R for contact of cross pins D of chain link tails C, as and for the
purposes described.
3. In combination with a cycle chain having links of the kind shown on the
drawings, the indents in the wheels J, M for the studs F to ride in and grip,
the loose running rings M, P, for carrying the chain as herein described.
The 92nd day of January 1805
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said William Speirs Simpson.