Improvements in or applicable to Pneumatic Tyres and Rims for Bicycle and other Wheels, and in the Means for Attaching and Detaching the same.
Year: 1893

page_text: Date of Application, 19th May, 1893-Accepted, 12th Aug., 1893
COMPLETE SPECIFICATION.
Improvements in or applicable to Pneumatic Tyres and Rims for
Bicycle and other Wheels, and in the Means for Attaching and
Detaching the same.
We JAMES HOWARTH and HUGH HOWARTH both of 27 Milton Street
Stockport Road, Manchester in the County of Lancaster, Sculptors 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 principally to an improved method of constructing the
outer covers of the pneumatic tyres for cycle and other wheels and attaching the
same to the rims thereof and consists first of an improved construction of the outer
covering of the tyre itself whereby we are enabled to fix the outer edges thereof to
the rim by pneumatic means independently of the inflation of the inner pneumatic
tube of the tyre, and secondly in a peculiar form or section of metallic rim adapted
to be used in connection therewith.
The nature of our said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference to
the annexed sheet of drawings and the following explanation thereof.
Fig. 1 on the drawing is a section and Fig. 2 a plan view of part of the outer
covering of a pneumatic tyre constructed according to our invention.
Fig. 3 is a section of our improved form of rim and Fig. 4 a section of the cover
and rim combined.
The cover itself is made in the usual manner of a combination of india rubber a
and canvas b (Figs. 1 and 2) being thickest at the central part which forms the
"tread "and gradually thinner towards the edges, being of an annular form as
usual and of such a width as may be required according to the sectional diameter of
the tyre to be made.
Instead however of forming the edges of the cover in the usual manner we form
along each edge thereof a hollow india rubber or india rubber lined tube c
extending continuously all round the same without a break and joined up perfectly
air tight.
Each annular tube c is fitted with an inflating tube d provided with a suitable
back-pressure valve.
The metal rim e of the wheel is made of the section shown at Fig. 3 being
provided with two tubular grooves e made by bending or curving the outer edges
inwards leaving an inner opening or slot ex all round, which is narrower than the
inside of the groove. The grooves e are each provided with a hole through which
the inflating tube d can pass.
The ordinary inflatible pneumatic tube of the tyre is not shown on the drawing
but it will be understood that it is inserted within the outer covering a-b and
inflated and deflated in the usual manner.
This internal pneumatic tube being in its place on the rim in a deflated or
partially deflated state, our improved cover is applied and fixed in the following
manner.
The small annular tubes c at the edges of the cover being deflated are pressed all
round through the annular openings or slots ex into the tubular grooves e of the
netal rim and their inflating tubes d passed through the holes in the metal rim
before mentioned.
The two annular tubes c are now inflated so as to completely fill the tubular
grooves e of the rim as shown at Fig. 4 thereby firmly attaching both edges of the
cover to the metal rim all round perfectly independent of the inflation of the

page_text: main pneumatic tube of the tyre or of any other internal or external means of
fastening.
The inner or main pneumatic tube of the tyre can then be inflated in the usual
manner, and it will be evident that if the latter should become punctured, or even
burst the tyre will keep its place on the wheel and cannot be removed therefrom
without deflating one (or both) of the annular tubes c so as to allow one or both
edges of the cover to be withdrawn from its tubular groove e.
۲۱
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The manufacture and use of the annular covering or outer part of a
pneumatic tyre with a continuous air tube along each edge all round the same
provided with means for inflating and deflating such tubular edges substantially as
hereinbefore described and illustrated by the annexed drawings.
2. The manufacture and use of metallic rims for bicycle and other wheels having
an open tubular groove along each edge made by bending the edges inwards so that
the openings face each other, such annular openings or slots being narrower than
the interior of the tube or groove substantially as hereinbefore described and
illustrated by the drawings.
open
3. The combination with the metallic rim of a wheel provided with tubular
grooves at each side of a tyre cover provided. on each edge with an inflatible tubular
rim along each side substantially as hereinbefore described and illustrated by the
drawings annexed.
Dated this 18th day of May 1893
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.