Improvements in, and in the Manufacture of, Pitch Chains.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in, and in the Manufacture of, Pitch Chains.
I, HANS RENOLD, of Green Lane, Manchester, in the County of Lancaster,
Engineer, do hereby declare the nature of this invention to be as follows:-
My said invention relates to improvements in and in the manufacture of pitch
chains for the transmission of rotary motion and refers to improvements upon
inventions for which I have obtained Letters Patent No. 1219 of 1880 and 12352
of 1891.
The object of my invention is to increase the strength and wearing surfaces
of the chain which I effect by devising means whereby I am enabled so to dis-
tribute or arrange the parts that I obtain two joints instead of one as formerly,
in a given length. For instance suppose the chain to be one inch pitch, I arrange
two joints per inch whilst still allowing one tooth per inch of the chain. I also
arrange to get the wearing parts of the chain of the largest possible dimensions
without increasing the width of the chain or encroaching upon the strength of
the tooth, and in addition materially improve the appearance of the chain.
In carrying my invention into effect I bore out the inner links at such a dis-
tance apart that the two rollers carried thereby almost touch each other, sufficient
clearance only being allowed to prevent the rollers from grinding upon each
other.
These two rollers form two joints no tooth space being provided between the
two.
The inner links are formed at each end with extensions which extensions serve
materially to strengthen the links.
The ends of the neighbouring inner links are arranged to abut closely to each
other thus presenting a practically unbroken line. The outer links are also
arranged with their ends abutting in a similar manner. The tooth space of the
pitch chain is formed between each pair of rollers instead of between each roller
as formerly and the tooth is enclosed at the sides by the extensions formed on
the ends of the inner links. These extensions are bevelled on their inner sides
by which I facilitate the sidewise entrance of the tooth into the chain. In a
chain constructed in accordance with my invention I obtain equal width of tooth
space along the inside of the chain, which in a running chain has a much neater
and undisturbing effect to the eye. The ends of the outer links also being
arranged close to each other present when running an unbroken appearance.
I prefer to form the ends of the bush with tapers and shrink the links upon
these tapers instead of as is usual forming a neck upon the bush upon which the
link is tightly fastened.
This obviates putting unnecessary metal into the bush which I may use to
advantage by increasing the wearing surface of the stud.

page_text: My invention is particularly applicable to the small pitch chains used for cycles
owing to the strength and neat appearance of the improved chain but I do not
of course confine myself to chains of small pitch.
Dated this 1st day of October 1897
Improvements in, and in the Manufacture of, Pitch Chains.
I, HANS RENOLD, of Green Lane, Manchester, in the County of Lancaster,
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 and accompanying drawings:-
My said invention relates to improvements in and in the manufacture of pitch
chains for the transmission of rotary motion and refers to improvements upon
inventions for which I have obtained Letters Patent No. 1219 of 1880 and 12352
of 1891.
The object of my invention is to increase the strength and wearing surfaces
of the chain which I effect by devising means whereby I am enabled so to dis-
tribute or arrange the parts that obtain two joints instead of one as formerly,
in a given length. For instance suppose the chain to be one inch pitch, I arrange
two joints per inch whilst still allowing one tooth per inch of the chain. I also
arrange to get the wearing parts of the chain of the largest possible dimensions
without increasing the width of the chain or encroaching upon the strength of
the tooth, and in addition materially improve the appearance of the chain.
The accompanying sheet of drawings illustrates my improved pitch chain of
1 inch pitch, drawn to an enlarged scale of five times.
Fig. 1 is a plan of the chain, partly outside view and partly in section.
Fig. 2 is a side view of same, and
Fig. 3 is a sectional elevation.
In constructing a chain in accordance with my invention I bore out the inner
links a at such a distance apart that the two rollers bb carried thereby almost
touch each other as shown in the drawings, sufficient clearance only being allowed
to prevent the rollers from grinding upon each other. The rollers b revolve upon
bushes c the inner links a being shrunk upon the bushes c. To facilitate this
the ends of the bushes may be slightly tapered. This method obviates forming a
neck upon the bush and fastening the links upon the neck, whereby I dispense
with unnecessary metal which I may use to advantage by increasing the wearing
surface of the bush c.
The bushes care mounted upon pins d which are rivetted to the outer links e
in the usual way.
The two rollers b carried by the inner links a form two joints, no tooth space
being provided between the two as will be seen from an inspection of Figs. 1
and 3.
The inner links a are formed at each end with extensions a¹ which extensions
serve materially to strengthen the links.
The ends of the neighbouring inner links are arranged to abut closely to each
other thus presenting a practically unbroken line. The outer links e are also
arranged with their ends abutting in a similar manner. The tooth space f of the

page_text: pitch chain is formed between two pairs of rollers instead of between two rollers
as formerly and the tooth is enclosed at the sides by the extensions a' formed on
the ends of the inner links a. These extensions are bevelled at a² on their inner
sides by which I facilitate the sidewise entrance of the tooth into the chain. In a
chain constructed in accordance with my invention I obtain equal width of tooth
space along the inside of the chain, which in a running chain has a much neater
The ends of the outer links also
appearance and undisturbing effect to the eye.
being arranged close to each other present when running an unbroken appearance.
My invention is particularly applicable to the small pitch chains used for cycles
owing to the strength and neat appearance of the improved chain but I do not
of course confine myself to chains of small pitch.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
The improved pitch chain constructed by providing the inner links with two
rollers revolving upon bushes secured to the inner links, the pairs of rollers being
disposed closely together, the ends of the inner and outer links being arranged
to abut close together, and the tooth space being formed between two pairs of
rollers and the projecting ends of the inner links, all arranged in the manner for
the purposes and substantially as described and illustrated.
Dated this l5th day of July 1896.
For the Applicant,
E. K. DUTTON & Co.,
Chartered Patent Agents, 5, John Dalton Street, Manchester.