Improved Means of Securing Together the Chain and Crank Wheel of Cycles.
Year: 1897

page_text: This Print is in accordance with the Original Specification as it stands after Amend-
ment (under Section 11 of the Patents, &c., Act, 1883), as required by the
decision of the Law Officer of the 22nd day of July 1898.
PROVISIONAL SPECIFICATION.
Improved Means of Securing Together the Chain and Crank Wheel of
Cycles.
I, EDWARD WILLIAMS, of 39, Waverhill Road, Handsworth, in the County of
Stafford, Engineer, do hereby declare the nature of this invention to be as
follows:
This invention has for its object the provision of simple means whereby a cycle
crank and driving chain wheel can be more effectually secured together than with
the ordinary methods of attachment now in use.
For securing the said cycle parts together in accordance with my invention,
I form on the inner side of the crank a projection from the boss to enter the eye
or central aperture of the chain wheel, such projection being somewhat larger
than the width or distance through the chain wheel boss. I then form upon the
periphery of the crank boss projection a number of teeth or serrations, preferably
by means of a die of the required configuration which I press over or on to the pro-
jection by a suitable pressing or forcing appliance. By means of a punch or plug
of the necessary configuration which is in like manner forced into or through the
chain wheel boss, I form within such eye teeth or serrations corresponding with
the said serrations on the crank boss projection. The crank boss projection is then
inserted within the chain wheel boss and its outer extremity is spun or forced over
to prevent lateral movement. Circular movement is effectually prevented, by the
serrated surface and the two parts are thus rigidly connected or secured together.
I sometimes form the teeth or serrations on the crank boss projection by means
of a knurling tool instead of with a die as hereinbefore described.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.
Improved Means of Securing Together the Crank and Chain Wheel of
Cycles.
I, EDWARD WILLIAMS, of 39, Waverhill Road, Handsworth, in the County of
Stafford, Engineer, do hereby declare the nature of this invention and in what
Price 8d.1

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement;-
This invention has for its object the provision of simple means whereby a cycle
crank and driving chain wheel can be more effectually secured together than with
the ordinary methods of attachments now in use.
In order that my invention may be the more readily understood I append here-
unto two sheets of explanatory drawings to be hereinafter referred to;
-
Figure One on Sheet 1 is a side elevation and Figure 2 a sectional end elevation
of a cycle driving chain wheel having its eye or central aperture serrated for the
reception of the crank illustrated at Figures 3 and 4. Figure 5 is a part sectional
view of the wheel and crank connected together.
In the larger scale views on Sheet 2, Figure 6 represents the plug for serrating
the eye or central aperture of the chain wheel boss, Figure 7 the knurling tool
for knurling or serrating the projection from the crank which fits within the chain
wheel, whilst Figure 8 illustrates the method of beading over the protruding end
of the crank projection.
The same reference letters in the different views indicate the same parts.
On the inner side of the crank A'I form a projection A' to enter the eye or cen-
tral aperture B of the chain wheel B such projection being slightly longer than the
width or distance through the said aperture B₁. By means of a knurling tool such
as C (Figure 7) I then knurl or serrate the periphery of the crank projection A¹
and by a plug as D (Figure 6) which is forced through the chain wheel boss I
form corresponding serrations in the eye or central aperture B¹. The crank pro-
jection A¹ is then inserted within the aperture B₁ until the chain wheel boss seats
tightly against the crank shoulder as illustrated at Figure 8, and by means of a
beading tool E, fitted with rollers such as E' E2 (the tool being revolved in a dril-
ling or other suitable machine), the protruding end of the crank projection A¹
is beaded over on to the chain wheel to prevent lateral movement. Circular move-
ments of the parts relatively to each other is effectually prevented by the knurled
or serrated surfaces.
Having now particularly described and ascertained the nature of my said inven-
tion and what manner the same is to be performed, I wish it to be understood
that I am aware that it has been previously proposed to secure cycle cranks and
chain wheels together by the use of ribbed, serrated or grooved connections and
that I do not claim such construction generally but I declare that what I claim
is:-
1. The securing together of a cycle crank and chain wheel by knurled surfaces
the fine teeth upon the crank being formed by pressing or knurling and those
in the wheel by drifting or forcing a plug through the wheel eye substantially as
described.
2. The use of tools substantially as described and as illustrated for knurling
the fitting or holding surfaces of a cycle crank and chain wheel and for securing
such parts together.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.