Improvements in Chain Wheels for Cycles.
Year: 1897

page_text: Date of Application, 19th June, 1897-Accepted, 19th Feb., 1898
COMPLETE SPECIFICATION.
Improvements in Chain Wheels for Cycles.
I, HENRY ROBINSON GILLING, of Oaklands, Arkley, Barnet, in the County of
Herts., Leather Merchant, 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 chain wheels for cycles and my inven-
tion consists in the improved construction of chain wheels whereby the tension of
the chain will in all positions of the chain-wheel during its revolution have a more
direct and thus more efficient pull and which chain will not mount or ride or tend
to mount over the teeth as in the case with chain wheels of the ordinary construction.
In the accompanying drawing Figs. 1, 2 and 3 show three wheels constructed in
accordance with my invention.
In carrying out my invention and referring firstly to Fig. 1, I make my improved
wheel with preferably four pairs of teeth a, b, each such pair being preferably
connected and thereby strengthened by means of a webb d.
The outer faces of each pair of teeth are made straight the plane or direction of
said faces being such that if continued-as indicated by dot and dash lines-the
plane of one pair of teeth would coincide with the plane of its opposite pair. The
distance between the teeth forming each pair and also the distance between such
pair of teeth may be any which is found in practice to be most suitable.
By the shape & arrangement of the teeth as described, four of the teeth (say a,)
around the wheel withstand the pull of the chain in the direction of the arrow a',
and the other four (b) withstand the pull in the direction of the arrow b', and in any
event the chain cannot mount on said teeth inasmuch as the pull is at right angles
to the plane of said teeth and the face of the teeth being flat there is no tendency
to wedge the chain outwards as in the case in which wheels of hitherto ordinary
construction.
If desired only two of the teeth (a) may be arranged to withstand the pull of the
chain in the direction of the arrow a¹ & two (b) in the other direction the remaining
four teeth (c) being merely adapted to act as guides to the chain as shown in Fig. 2.
As a further alternative-shown in Fig. 3-my improved chain wheel may
consist of a plate or the like having, say, four right angled notches e, adapted to
receive say alternate or every third or other link pin of a suitable chain the inter-
mediate link pins entering suitable spaces or openings in said wheels, said
intermediate link pin being preferably out of contact with the chain wheel.
The portions of the chain wheel situated between the notches and openings
referred to are preferably tapered to a comparatively thin edge and are of such
dimensions and shape as to enter and thereby guide and retain in a central position
each link of the chain as it is brought on to the chain wheel.
Instead of four notches my improved chain wheel may be formed with say three
or more and if desired each link pin may engage with a relative notch on the chain
wheel.
I wish it to be understood that I do not confine my invention to any number of

page_text: teeth or pairs of teeth and also that said teeth may engage every link pin or every
alternate link pin or otherwise as desired.
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. A chain wheel having say four pairs of teeth the outer faces of each pair being
flat in a line with the opposite pairs of teeth for the purposes and substantially as set
forth.
2. A chain wheel having say four right angled notches adapted to receive say
alternate link pins for the purposes and substantially as set forth.
3. A chain wheel the teeth or any of the teeth of which are flat and situated so
as to receive the pull of the chain at right angles to the surface or plane of said
teeth substantially as set forth.
4. A chain wheel having say half its number of teeth adapted to receive the pull
of the chain in one direction and the other half adapted to receive the pull of the
chain in the opposite direction substantially as set forth.
D
101
T
1007
HENRY ROBINSON GILLING,
By his Agents,
Horn, Son & Co.,
151, Strand (next to Somerset House) London.