Improvements in Driving Chains for Cycles and other similar purposes.
Year: 1895

page_text: Date of Application; 6th Apr., 1895
Complete Specification Left, 5th Feb., 1896-Accepted, 7th Mar., 1896
PROVISIONAL SPECIFICATION.
Improvements in Driving Chains for Cycles and other similar
purposes.
We JOHN WHITEHALL, and GEORGE BEDFORD, both of Albion Works,
Whitehouse Street, Aston Road North, in the City of Birmingham, Engineers, do
hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in driving chains for cycles or other similar
purposes, and consists as follows:--
It is well known that with chains of present make, where the links are connected
together by solid pins, that the wear takes place upon the one half of its circum-
ference only, due to the pull of the chain, which wear is of course comparatively
excessive. Several attempts have been made to obviate this, either by hardening
the central part of the said pin, and having the two ends as soft as possible
for rivetting purposes, or by employing a hardened sheet steel tubular cover for
the central pin.
In this our invention, we make the said pin of two parts in the following
manner; In transverse section we divide the pin into two semicircles, in which
the one half is hardened, while the other half is soft. The hardened part is
made just the length required to pass through the block and the two side links,
while the soft half is left a little longer to permit of being rivetted over, such
rivetting serving not only to secure the soft half but also the hardened part.
If desired one of various means may be adopted to prevent rotation of the divided
pin in the links, such as being made D shaped, or by starring the outer edge of the
holes where rivetted, or the ends of the said two parts of the pin may each be
reduced in diameter so as to form a shoulder equal to about the thickness of the
block, or centre link.
This our invention is applicable to block, roller, and other similar chains.
Dated this 5th day of Ancil 1895.
Improvements in Driving Chains for Cycles and other similar
purposes.
We JOHN WHITEHALL, and GEORGE BEDFORD, both of Albion Works,
Whitehouse Street, Aston Road North, in the City of Birminghain, Engineers, 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 improvements in driving chains for cycles or other
similar purposes, and consists as hereinafter described.
It is well known that with chains of present make, where the links are connected

page_text: together by solid pins, that the wear takes place upon the one half of its circum-
ference only, due to the pull of the chain, which wear is of course comparatively
excessive. Several attempts have been made to obviate this, either by hardening
the central part of the said pin, and having the two ends as soft as possible for
rivetting purposes, or by employing a hardened sheet steel tubular cover for the
central pin.
Our invention consists as follows, and in order to explain it more fully we have
appended hereunto an illustrative sheet of drawings, upon which are figures and
numbers of reference, similar numbers referring throughout the several views to the
same thing or part.
Fig. 1, is a general side view of a short length of the completed chain.
Fig. 2, is a part sectional plan view of the chain on line A-B.
Fig. 3, is a side view, and Fig. 4, an end view of the hardened half of the pin.
Fig. 5, is a side view, and Fig. 6, an end view of the soft (or unhardened) half of
the pin.
We make the joint pin of two parts 9 and 10, the one half 9, being of steel
hardened, while the part 10 is left soft. The hardened part 9, is made just the
length required to pass through the block 11, and the two side links 12, 12, while the
soft half 10, is left a little longer to permit of being rivetted over, as shown at 13,
in Figs. 1 & 2, such rivetting serving not only to secure the soft half but also the
hardened part.
If desired one of various means may be adopted to prevent rotation of the divided
pin in the links, such as being made D, shaped, or by starring the outer edge of the
holes where rivetted, as seen at 14, Fig. 1. Preferably the ends of the said two
parts of the pin are each reduced in diameter as seen at 15, so as to form a shoulder
equal to about the thickness of the block or centro link.
This our invention is applicable to block, roller, and other similar chains.
Having now particularly described and ascertained the nature of this our said
invention, and in what manner the same is to be performed, we declare that what we
claim is
1. Making the joint pins in driving chains for cycles or other similar purposes of
two parts, the one hardened and the other soft, as and for the purposes hereinbefore
described and shown.
2. Connecting the links and blocks or rollers of driving chains together by means
of a two part joint pin, the one part made hard and the other part soft, constructed
and arranged substantially as herein described and shown.
Dated this 4th day of February 1896.
CHARLES T. POWELL,
12 Cherry, Street, Birmingham, Applicants' Agent.