Improvements relating to Chain and other Gear Wheels,
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements relating to Chain and other Gear Wheels,
J
I, EDWARD WILLIAMS, of 48, Benson Road, in the City of Birmingham, Engineer,
do hereby declare the nature of this invention to be as follows:―
This invention consists of improvements relating to chain and other gear
wheels as employed on cycles and other machines, my object being to readily
produce such wheels of light weight but of great strength and durability.
.
I produce wheels in accordance with my invention from sheet metal, preferably
from cold bright rolled sheet steel, the thickness of the sheet being equal
only to the required thickness of the arms, spokes, or central web
of the wheels. From such sheet I stamp or otherwise cut out circular blanks
of a diameter rather larger than that of the required finislied wheel, and make a
central eye or aperture through each.
For the purpose of forming a rim of the required width and thickness I mount
each disc upon a suitably arranged shaft, mandrel, or carrier, with which it is
revolved in any convenient manner and by which its central portion is stiffened
and supported during the process of subjecting the metal at the rim portion of
the blank to such pressure as will cause it to flow to or assume the required shape.
The said pressure I impose preferably through a revolving roll which advanced
on to the rim of the blank or disc and is of such a forur or shape as to produce, in
conjunction with the periphery of the revolving carrier upon which the blank is
mounted, a rim of the required section.
I sometimes form the teeth in the, wheel simultaneously with the formation of
the rim by the employment of a rim forming roll having the required depressions
around its periphery, or the teeth may be formed after the formation of the
rim and by another process.
'
On the completion of the rim I pierce the blank as may be necessary for the
formation of arms or spokes or of a perforated centre of the required design.
Toted this 1
Jav
TI
1000
improvements relating to Chain and other Gear Wheels.
I, EDWARD WILLIAMS, of 48, Benson Road, in the City of Birmingham, Engineer,
do hereby declare the nature of this invention and in what manner the same is
[Price 8d.1

page_text: ".
:
to be performed, to be particularly described and ascertained in and by the
following statement: -
This invention consists of improvements relating to chain and other gear
wheels as employed on cycles and other machines, my object being to
produce such wheels of light weight but of great strength and durability.
1 produce wheels in accordance with my invention from sheet metal, preferably
from cold bright rolled sheet steel, the thickness of the sheet being equal
only to the required thickness of the arms, spokes, or central web
of the wheels. From such sheet I stamp or otherwise cut out circular blanks
of a diameter rather larger than that of the required finished wheel, and make a
central eye or aperture through each.
For the purpose of forming a rim of the required width and thickness I mount
each disc upon a suitably arranged shaft, mandrel, or carrier with which it is
revolved and by which its central portion is stiffened and supported during the
process of subjecting the metal at the rim portion of the blank to such pressure as
will cause it to flow to or assume the required shape. The said pressure I impose
preferably through a revolving roll on to which the rim of the blank.or disc is
advanced; the said roll being of such a form or shape as to produce, in conjunction
with the periphery of the revolving carrier upon which the blank is mounted, a
rim of the required section.
I sometimes form the teeth in the wheel simultaneously with the formation of
the rim by the employment of a rim forming roll having the required depressions
around its periphery, or the teeth may be formed after the formation of the
rim and by another process.
On the completion of the rim I pierce the blank as may be necessary for the
formation of arms or spokes or of a perforated centre of the required design.
Referring to the accompanying sheet of explanatory drawings.
Figure is an elevation of one arrangement, of mechanism I employ in the
manufacture of wheels in accordance with my invention, one part of such
mechanism being shown in the out of service position.
Figure 2 is an elevation and Figure 3 a plan showing the whole of the
meclianism in position for action or service.
Figure 4 is an end elevation showing, to a larger scale a portion of the rim
Torming roll, the gear wheel disc or blank, and the blank clamping plates.
The same reference letters in the different views indicate the same parts.
Imount each disc between a pair of clamping plates A A having gudgeons a a'
mounted in an arm or bracket B, pivoted to the framing C. The two clamping
plates with the wheel disc or blank between them are rigidly connected together
by the clamping bolts and nuts.as 1, the said bolts passing through holes formed
in the blank. The peripheries of the circular clamping plates A-A are grooved
on their inner sides, and the roll E has a plain central groove cut around its
periphery, as illustrated at Figure 4. The space enclosed by the said grooves
(where the roll E is adjacent to the plates A A) constitutes the mould or die for
the formation of the rim I, the metal at the periphery of the blank being caused
by the pressure imposed upon it to flow or assume the shape of the said die space.
Such pressure I impose by forcing the blank periphery on to the grooved roll E
which is clamped in position on the screwed shaft G by nuts H H¹, and driven
through gearing arranged in any ordinary manner. The periphery of the blank or
dise of metal mounted between the plates A A, is fed on to the grooved periphery
of the rotating roll E preferably by the gradual descent of the pivoted arm or
bracket B, from the position shown at Figure 1 to the position indicated at
Figure 2, such descent being effected by means of any suitable and ordinary
mechanical device for turning the arm or bracket B about its pivot supports. The
periphery of the blank being thus forced into contact with the grooved roll E
rotating in the direction indicated by the arrow 1, the blank and the plates A A
will be caused to rotate in the direction indicated by the arrow 2, and as the
movement of the turning gear is gradually continued the metal at the periphery

page_text: of the blank will be caused to flow and fill the die space formed by the grooves of
the roll E and the plates A A', and thus to assume the rim form as shown at F
Figure 4.
Adjustment of the position of the pivoted bracket to suit wheel blanks of varying
diameters is effected by means of the screws JJ and abutment blocks K K'.
I sometimes form the teeth in the wheel' simultaneously with the formation of
the rim by the employment of a roll having the required depressions formed in
the groove around its periphery, instead of the plain grooved roll A as herein-
before described. Or I may form the teeth after the formation of the rim, and
in one way by stamping out the portions corresponding with the teeth spaces
and subsequently finishing the rim by subjecting it to the rolling and pressing
action with the before mentioned recessed and grooved roll:
.
I pierce the blank, as may be necessary for the formation of arms or spokes, or
of a perforated centre of the required design, and machine the inner edges and
other parts in any ordinary manner.
'
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be pertorined 1 declare that what
I claim is
1. Sheet metal wheels for chain and other driving gear, having rims rolled
and pressed to the required dimensions, substantially as described.
2. The process of manufacturing chain and other gear wheels from cold briglit
rolled steel or other sheets of a thickness equal only to the required thickness of
the arms, spokes, or central web of the wheels, substantially as described.
3. The arrangement and combination of parts comprising the means for form-
ing tre rims of chain and other gear wheels, substantially as described and as
illustrated.
Dated this 30th day of March 1900.
MARKS & CLERK,
18, Southampton Buildings, London, WC.,
13, Temple Street, Birmingham, & 25, Cross Street, Manchester.
Agents for the Applicant: