An Improved Chain and Gear Wheel.
Year: 1899

page_text: Date of Application, 30th Jan., 1899-Accepted, 4th Mar., 1899
COMPLETE SPECIFICATION.
An Improved Chain and Gear Wheel.
I, WILLIAM FLETCHER, of 14, Northcote Terrace, Kirkewhite Street, Notting-
ham, Machine Fitter, 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 chain and gear wheel for use with the
same, and its object is to provide a gearing device which can be made inexpen-
sively, and which will at the same time be thoroughly effective in action and easy
to detach or put together.
The chain I employ is composed of a number of similar links at the inner side
of each of which is a projecting tooth. The links are connected together by
means of a hook at one end which engages with a loop at the other end of
the adjacent link.
The wheel for use in connection with this chain is formed with a double or
grooved rim between the sides of which the projecting part of the links extends.
The chain engages with pins and rollers in the groove of the wheel.
In order that the invention may be more clearly understood, reference is had
to the accompanying sheet of drawings in which Fig. 1 is a side view of a few
links of the chain connected together. Fig. 2 is a plan of one of the links, Fig. 3
is a side view partly in section of the wheel for use with the chain, and Fig. 4
shows a link in end view engaging with the rim of the wheel which is in section.
The body of the link A is formed with the loop a at one end providing an
engaging bar at the extremity. At the other end is the hook a¹ which is narrower
than the main part of the link so as to engage in the loop of the adjacent link.
The projection a² is formed immediately in front of the hook to assist in attaching
and detaching the links. To attach one link to the next it is turned over so
that the projection a² rests upon the top of the next link and the under part of
the latter can then be slipped into the hook. On turning over the first link, the
two are securely connected together. To disconnect one link is turned over as
described and the hook can then be slipped out of the connecting loop.
Each link is provided with the tooth B preferably of about the same thickness
as the hook, but tapering slightly towards the point. When the chain is complete
and is passed over the wheel the teeth project radially into the groove of the
latter. More than one hook and loop may be employed in the case of wide chains,
the number depending upon the width.
The wheel is formed with the double rim e in the groove of which are the
pins D carrying friction rollers. In the arrangement shown these are fitted in
pairs and the teeth B engage between each pair.
In place of the pins a cog wheel might be employed having a projecting rim
at each side to hold the chain in position, the arrangement reducing the friction
0 of the ordinary chain gearing. With however a wheel constructed as shown the
expense and trouble of cutting the teeth is obviated thus enabling a cheap gearing
to be obtained.

page_text: 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) An improved chain for chain gearing, each link of which is provided with
an engaging hook, and a loop, one at each end and a tooth at the inner side adapted
to engage with the gear wheel, substantially as described and for the purposes
specified.
(2) The improved chain for chain gearing formed from the links A each having
an engaging loop a at one end and the narrower hook a¹ at the other and the
tooth B at the underside engaging with the gear wheel, substantially as described
and for the purposes specified.
(3) In combination with a chain as claimed above a chain wheel having a
grooved or double rim and engaging parts within the said grooves with which the
teeth of the chain engage, substantially as and for the purposes specified.
(4) The improved chain and chain wheel, constructed substantially as described
and shown in the accompanying drawings and for the purposes specified.
Dated this 30th day of January 1899.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.