Improvements in Chain Driving Gear.
Year: 1896

page_text: "
Date of Application, 9th Dec., 1896-Accepted, 9th Jan., 1897
COMPLETE SPECIFICATION.
Improvements in Chain Driving Gear.
I, BENJAMIN FRANKLYN SPARR of 3, Centre Street, in the City of Newark,
County of Essex, and State of New Jersey, United States of America, 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 :-
This invention relates to an improved driving chain and sprocket wheel therefor.
In the accompanying drawing which illustrates this invention, arranged by way
of example for use in velocipedes,
Figure 1 is a broken view in side elevation and
Figure 2 is a broken view in plan of the chain only.
In both views similar parts are marked with like letters of reference.
The driving chain is made up of a series of solid links or blocks A and double
plate links B preferably alternating with one another and connected together by
transverse pins or rivets C in the ordinary manner.
The solid links or blocks A have rounded ends a¹ and suitably shaped projections a
on one side and the alternate plate links C are either curved as shown or straight.
The solid links or blocks A act as the driving medium between the chain and the
sprocket wheels D and D', one of the said wheels D-in a cycle the wheel that
imparts motion to the chain-having teeth d shaped to engage with the rounded
ends a' a' of the solid links or blocks A and the other wheel D' having recesses d¹
with which the teeth a of the said links or blocks engage. The recesses d' between
the teeth d of the wheel D are of such a shape as will provide clearance for the
teeth a and are of such a depth that the bottom of the teeth a take a bearing
thereon and so keep the rounded ends a¹ a¹ of the solid links or blocks A from
binding on the teeth d and the teeth or projections d³ between the recesses d' in the
wheel D' are of such a shape as wil! clear the rounded ends a¹ a¹ of the teeth a and
at the same time act as lateral guides to the plate links B.
It will be obvious that the teeth and links may be of any desired pitch and the
teeth of any desired length.
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 :-
(1) The improvements in chain driving gear as hereinbefore set forth.
(2) A driving chain consisting of a series of plate links and solid links or blocks
having tooth-like projections, as set forth.
(3) A chain driving gear consisting of a chain made up of plate links and solid
links or blocks having tooth-like projections, and of two sprocket wheels the one
having teeth adapted to engage with the rounded ends of the solid links or blocks
and the other having recesses adapted to engage with the tooth-like projections on
the solid links or blocks, as set forth.
(4) A chain driving gear consisting of a chain made up of plate links and solid
links or blocks having toothlike projections on one side, and of two sprocket
wheels each having a series of alternate teeth and recesses, the teeth of one of the
said wheels being shaped to engage with the ends of the solid links or blocks
whilst its recesses are shaped to give clearance and of such a depth to give a
O

page_text: bearing to the tooth-like projections on the said links, and the teeth of the other
wheel being shaped to clear the ends of the solid link or block but adapted to
engage with the sides of the plate link so as to act as lateral guides, the recesses of
the said wheel being shaped to receive the tooth-like projections on the solid links or
blocks, as set forth.
Dated this 9th day of December 1896.
ROBERT. E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.