Improvements in Cycle and other Driving Chains.
Year: 1895

page_text: Date of Application, 27th Nov., 1895-Accepted, 26th Sept., 1836
COMPLETE SPECIFICATION.
Improvements in Cycle and other Driving Chains.
I, JOHN SMITH, of Salford Works, Richard Street, in the City of Birmingham,.
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 improvements in cycle and other driving chains, my
object being to construct a neat and durable chain having the blocks or bearing
parts so formed that the chain wheel teeth or projections shall accurately gear with
the same and thus transmit the driving force with a smooth and steady motion and
a minimum frictional loss.
In the accompanying sheet of explanatory drawings to be hereinafter referred.
to ;-
Figure 1 is a side elevation representing a short length of my improved chain,
and Figure 2 a plan of the same.
Figure 3 is a side elevation, and Figure 4 an end elevation of the blocks or
bearing pieces.
The same reference letters in the different views indicate the same parts.
In the application of my invention I produce the side plates A from steel or
other suitable metal stamped or formed to the required shape. The blocks or
bearing pieces B rivetted between the side plates or links A in the ordinary
manner, are preferably formed with a flat side B₁ as shown at Figures 3 and 4.
The opposite side B2 is of a circular configuration, the surface of the metal
beneath the rivet holes being made concentric with such holes as illustrated, and
in order to lighten the blocks I drill or form the hole 6 through the same.
The ends B³ of the blocks are formed to a cycloidal configuration, or of a
curved outline such as described by the point of the teeth or projections of the
chain wheel during its revolution. The ends of the blocks being thus formed as.
a portion of the circular path described by the rolling teeth, they offer no
obstructing surface to the movement of the wheel.
The complete chain when coupled up and adjusted in the ordinary manner over
a pair of chain wheels, affords an efficient means whereby the power is transmitted
with a smooth and steady motion from the driving to the driven wheel.
I do not limit the application of my invention to any particular form or shape
of the side plates and links, or of the connecting blocks or bearing pieces,.
although in all cases I employ the cycloidal or curved form of bearing surfaces
such as hereinbefore described.
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. In cycle and other driving chains the use of blocks or connecting pieces
having cycloidal or curved bearing surfaces substantially as and for the purposes.

page_text: 2. The improved gearing chain substantially as hereinbefore described, and as
illustrated in the accompanying drawings.
Dated this 26th day of November 1895.
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.