Improvements in Chain Driving Gear applicable to Cycles.
Year: 1895

page_text: Date of Application, 23rd Oct., 1895
Complete Specification Left, 22nd July, 1896-Accepted, 22nd Aug., 1996
PROVISIONAL SPECIFICATION.
Improvements in Chain Driving Gear applicable to Cycles.
I, RICHARD MOUNTFORD DEELEY, of 10 Charnwood Street, in the Town and
County of Derby, do hereby declare the nature of this invention to be n
follows:-
In my improved chain duving gaat, of which a portion is shown by the drawing
annexed, the dising links of the chain are perforated for the teeth of the wheels
to enter, and they are connected by smaller coupling links
The slots in the links have carved ends which are struck from the joint pins and
the teeth have the same cu vatme so that when tooth and link engage the driving
sui faces coincide or fit together, the link then resting upon the rim of the wheel.
Preferably the pitch of the chain is made slightly longer than that of the teeth
When at work as each slotted link comes into position resting upon the rim of
the wheel, the driving surfaces of the link and the tooth close together and come
into contact whilst the other links and teeth are free.
The arrangement may be modified by dividing each diving link longitudinally
and placing the parts back to back with the coupling links between. The teeth
are then arranged in pans side by side, and the diving links enter between them.
By the construction herein descubed I avoid the friction of the driving surfaces
the one on the other which occurs in other chain driving gear.
Date this "ond dox of Databo, 1805
тартуешению топат DIYна
I, RICHARD MOUNTFORD DEELEY, of 10 Charnwood Street, in the Town and
County of Derby, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly descubed and ascertained
in and by the following statement
In my improved chain driving gear the driving links of the cham are perforated
for the teeth of the wheels to enter, and they are connected by smaller coupling
links
The slots in the links have curved ends which are stuck from the joint pins and
the teeth have the same curvature so that when tooth and link engage the diving
surfaces coincide on hit together the link then resting upon the rim of the wheel.
Preferably the pitch of the chain is made slightly longer than that of the teeth.
When at work as each slotted link comes into position resting upon the iim of
the wheel, the driving surfaces of the link and the tooth close together and come
into contact whilst the other links and teeth which were previously in contact
become free and allow the chain to leave the teeth fieely.
Figure 1 is a side view partly in section and with parts removed, it shews a
chain gear in accordance with my invention and suitable for a bicycle.
Figure 2 is a plan of a portion of the chain

page_text: a a are the driving links, they are connected into a cham by joint pins & band
coupling links e c. The beating surfaces at the ends a' a' of the slots in the
diving links are concentric with the joint pins. The teeth of the wheels d and e
around which the chain passes, have bearing surfaces of like form to those on the
chain.
As the cham enters upon the driving wheel at fand takes the curvature of the
wheel the bearing surface of the link closes against the tooth of the wheel,
the bearing surface heing further from the centre of the wheel than the joint pin,
and as the pitch of the chain is a little longer than that of the teeth of the wheel,
as each tooth takes its bearing the preceding teeth are relieved.
In the modification shewn by Figures 3 and 4 the radius of the bearing surface
on the link is the distance between the joint pins or studs and the beating surfaces
then close together normally. As represented by the diawing the joint pins are
replaced by studs which form part of the connecting links and a long pin
lying between the driving links sei ves to join the connecting links on the opposite
sides of the chain.
The arrangement may be modified by dividing each diving link longitudinally
and placing the parts back to back with the coupling links between. The tecth
are then aanged in pans side by side and the driving links enter between them
Figures 5 and 6 illustrate this modification; Figure 5 is partly in section on the
live 5-5 in Figme 6. The driving links are cacli in two paits joined together by
the joint pins and they have horns a² a² on which are the Leasing surfaces.
The connecting links e ale single and the joint pins pass through them.
Figure 7 shows a modification of the form shown by Figures 5 and 6 Here the
connecting links are formed with studs which replace the joint pins and the two
parts of the diving link are connected by a pin a³.
By the construction herem described I avoid the function of the driving surfaces
the one on the other which occurs in other chain driving gear.
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. Chain driving gear substantially as described in respect to Figures 1, 2, 3
and 4 in which the teeth of the wheels enter slots in the luks such slots having
curved ends struck from the joint pins and the teeth being of corresponding form.
2. Chain diving gear substantially as descubed in respect to Figures 5, 6
and 7 in which the teeth of the wheels are arranged in pans and the driving links
of the chain enter between the teeth and have horns which engage with the
teeth, the horns and the teeth being adapted to each other in the manner
explained.
3 Chain dung gear substantially as described in which the pitch of the chain
18 somewhat larger than that of the teeth of the wheels and in which the bearing
surfaces of the links are on the outer side of the chain or further from the centic
of the wheel than the centre of the joint pins so that as each link passes on to the
driving wheel its bearing surface closes against the tooth of the wheel and relieves
the preceding link from the pressure of the tooth.
Duted this 14th day of July 1896.