Improvements in Driving Chains for Cycles and other such like purposes, and in the Manufacture of the same.
Year: 1892

page_text: Date of Application, 10th Sept., 1892
Complete Specification Left, 5th June, 1893-Accepted, 8th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Driving Chains for Cycles and other such like
purposes, and in the Manufacture of the same.
I, FREDERICK WILLIAM BRAMPTON of the firm of F. Brampton & Co. of
14 Oliver Street Birmingham in the County of Warwick Manufacturer do hereby
declare the nature of my said invention to be as follows:-
My invention has for its object improvements in driving chains for cycles and
other such like purposes and in the manufacture of the same and is for the purpose
of preventing the liability that such chains have to ride upon the points of the
teeth of the chain wheels used in connection with them. When chains do so ride
upon the points of the wheels exceptional strains are brought to bear upon the
parts and sometimes great danger is so caused. We prevent this by our invention
in the following manner.
The chains as more ordinarily made have inner and outer links. The inner links
carry the studs rollers or other surfaces which bear upon the teeth of the chain
wheel so that the teeth enter between the inner links are driven thereby. It is
therefore these inner links which are so liable to ride upon the edges of the teeth.
To avoid this liability after the links are stamped we place each one in a die under
a press or stamp or similar tool and subject it to pressure or impact. The dies are
so formed as to give a continuous taper or bevil to the inner edges of the links
which may either continue all the way round or only a portion of the distance and
the bevel inay be straight or curved or partly one and partly the other. The effect
in either case is to prevent the riding tendency so that the severe jerks and excessive
strains are thus avoided.
Dated this 9th day of September 1892.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent.
COMPLETE SPECIFICATION.
Improvements in Driving Chains for Cycles and other such like
purposes, and in the Manufacture of the same.
I, FREDERICK WILLIAM BRAMPTON, of the firm of F. Brampton & Co. of
14 Oliver Street, Nechells, Birmingham in the County of Warwick, Manufacturer
do hereby declare the nature of my said invention and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement:―
My invention has for its object improvements in driving chains for cycles and
other such like purposes and in the manufacture of the same, and is for the purpose
of preventing the liability that such chains have to ride upon the points of the
teeth of the chain wheels used in connection with them. When chains do so ride
upon the points of the wheels exceptional strains are brought to bear upon the
parts and sometimes great danger is so caused. We prevent this by our invention in
the following manner :-
The chains as more ordinarily made have inner and outer links. The inner links
carry the studs, rollers or other surfaces which bear upon the teeth of the chain
wheel so that the teeth enter between the inner links are driven thereby. It is,
therefore, these inner links which are so liable to ride upon the edges of the
teeth. To avoid this liability after the links are stamped we place each one in a
die under a press or stamp or similar tool and subject it to pressure or impact.

page_text: The dies are so formed as to give a continuous taper or bevel to the inner edges of
the links which may either continue all the way round or only a portion of the
distance and the bevel may be straight or curved or partly one and partly the
other. The effect in either case is to prevent the riding tendency so that the severe
jerks and excessive strains are thus avoided.
In order that my invention may be clearly understood and more easily carried
into practical effect, I have appended hereunto a sheet of drawings illustrating by
enlarged views my invention as applied to two distinct kinds of chains which will
serve as examples but the invention is applicable to other pattern chains as well as
the two shown.
Figure 1, is a perspective view of an ordinary driving chain such as is used for
cycles.
Figure 2, is a cross section through the inner links A on the line 1-2.
Figure 3, is a perspective view of another kind of chain well known to cycle
manufacturers in which there are no outer links.
Figure 4, is a cross section through the links C on the line 3-4.
The chain shown by Figures 1 and 2 is composed of the inuer links A and the
outer links B with the intermediate round blocks or friction and drawing ferrules E
which is the connecting medium for the inner and outer links all of which is well
known and understood. When this chain is in work the teeth of the chain wheels
enter between the links A only and have hitherto had a dangerous tendency to
catch the inner edges of the links A in which case, great strain is brought upon
both the chain and the machine. This is especially the case when the machine is
travelling fast down hill and the feet are not on the pedals. To prevent this
tendency I bevel the inner edges of the links A. as seen at a' in both Figures 1 and 2
which ensures the entrance of the points of the teeth without any liability of
riding.
The chain shown by Figures 3 and 4 is composed of the side links C and inter-
mediate blocks K there being two holes in each block as is well known. The teeth
of the chain wheel enter between the links C and the same tendency of riding exists
in this chain as in the former examples and other patterns in the market, more or
less known. I bevel these links Con their inner edges as shown in both
Figures 3 and 4. It will be obvious that the hevel may be more or less as desired
and that it may take the form of a curve with similar effect.
ان
In manufacturing these chains I make the tools for the press so that the bevelled
or rounded edges are compressed into the form shown after they have been cut
out to the necessary external configuration. This process compresses the metal
and makes a better finish of the links. I may of course bevel or round the outer
edges if I choose but there is no real necessity for this so far as the action is
concerned.
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 :-
The improvements in driving chains for cycles and of her such like purposes,
and in the manufacture of the same by which the inner edges are bevelled or
rounded, as and for the purpose herein set forth and as shown upon the
drawings.
Dated this 1st day of June 1893.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent.