Improvements in or relating to Pneumatic Tyres.
Year: 1892

page_text: Date of Application, 21st Nov., 1892
Complete Specification Left, 17th May, 1893-Accepted, 17th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Pneumatic Tyres.
I, JAMES IDDON, of the Brookfield Iron Works, Leyland, near Preston, in the
County of Lancaster, Engineer and Machine Maker, do hereby declare the nature
of this invention to be as follows:-
This invention has reference to an improved method of fastening or securing
a pneumatic tyre to its wheel rim. In carrying out the said invention I employ
a curved sheet steel rim of the ordinary kind but formed with a central channel
or groove the said channel being made wider at the bottom than at the top or in
other words what is sometimes termed "undercut." The longitudinal edges of
the outer rubber tube or covering of the tyre are turned up in the form of
rectangular lips in the process of manufacture at right angles to the body of the
covering when laid flat and these lips are brought round the inner tube and
pressed into the groove or channel in the rim and when the inner tube has
been tightly inflated in the usual way the said lips are thereby pressed against
or under the undercut sides of the groove or channel and thus the tyre becomes
fastened or secured to the rim. To assist the operation just described the outer
tube or covering is provided underneath the rectangular lips with other lips of
soft rubber so arranged that the outward pressure of the inner tube when inflated
not only makes a watertight joint between the adjoining edges of the outer tube
or covering but also has the tendency to press or distend the rectangular lips
outwardly against the undercut sides of the groove or channel.
In order to give
the said rectangular lips a stronger hold in the groove or channel and at the
same time to retain the required amount of elasticity I make the said lips in sections
longitudinally that is to say in short lengths alternately of hard rubber or ebonite
vulcanised on to the outer covering and ordinary soft or elastic rubber.
Dated this 21st day of November 1892.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Pneumatic Tyres.
1, JAMES IDDON of the Brookfield Iron Works, Leyland, near Preston, in the
County of Lancaster, Engineer and Machine Maker, 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 has reference to an improved method of fastening or securing a
pueumatic tyre to its wheel rim. In carrying out the said invention I employ
a curved sheet steel rim of the ordinary kind but formed with a central channel or
groove the said channel being made wider at the bottom than at the top or in other
words what is sometimes termed "undercut." The longitudinal edges of the outer
rubber tube or covering of the tyre are turned up in the form of rectangular lips
in the process of manufacture at right angles to the body of the covering when laid
flat and these lips are brought round the inner tube and pressed into the groove or
channel in the rim and when the inner tube has been tightly inflated in the usual
way the said lips are thereby pressed against or under the undercut sides of the
groove or channel and thus the tyre becomes fastened or secured to the rim. To
D17

page_text: assist the operation just described the outer tube or covering is provided underneath
the rectangular lips with other lips of soft rubber so arranged that the outward
pressure of the inner tube when inflated not only makes a watertight joint between
the adjoining edges of the outer tube or covering but also has the tendency to press
or distend the rectangular lips outwardly against the undercut sides of the groove
or channel.
In order to give the said rectangular lips a stronger hold on the
undercut sides of the groove or channel and at the same time provide or retain the
required amount of elasticity to enable the outer covering to be stretched over or
placed upon the rim I make the said lips in sections longitudinally that is to say in
short lengths alternately of hard rubber or ebonite (vulcanised on to the outer
covering) and ordinary soft or elastic rubber.
In the accompanying drawings
Fig. 1 is a plan view designed to illustrate the alternate sections of hard and
soft rubber as applied to the lips of an outer covering of a pneumatic tyre
constructed according to my said invention.
Figs. 2 and 3 are cross sectional views illustrating the mode of inserting the lips
of the said outer covering into the channel or groove of a wheel rim as herein-
above described and
Fig. 4 is another cross sectional view shewing the effect on the lips on the said
outer covering within the channel or groove of the rim when the inner or air tube
has been inflated.
Figs. 2, 3, and 4 are drawn to a larger scale than Fig. 1.
a is the curved sheet steel rim having an undercut central channel or groove h.
is the outer covering having the lips c c formed in alternate sections of hard
rubber d and soft rubber e these sections being preferably made in lengths of about
two inches of hard rubber to one inch of soft rubber. ff are other lips of soft
rubber which under the pressure of the inner tube 7 when inflated make a water-
tight joint between the two adjoining edges of the lips cc and thus prevent the
ingress of water or dirt between the outer covering and the inner tube (see Fig 4).
The pressure of the said lips ff against each other also tends to press or distend
the lips cc outwardly against the undercut sides of the groove or channel h.
I make the entrance or narrow part of the groove or channel of such a width
relatively to the width of the lips c c that only one lip can be inserted at a time in
the manner shewn at Fig. 2.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I beg to state that I am
aware that it is not new to employ a wheel rim having a dove-tailed groove or
channel which receives or encloses the thickened edges of the outer covering of a
pneumatic tyre the inflation of the inner or air tube causing the adherence of the
tyre to the wheel rim and I therefore lay no claim to such an arrangement as being
of my invention but what I do claim is :-
The combination with a wheel rim having an undercut central channel or groove
and the inner or air tube of a pneumatic tyre of an outer covering having turned-up
edges or lips made in sections of hard and soft rubber alternately substantially as
hereinbefore described and shewn in the accompanying drawings for the purpose
set forth.
Dated this 17th day of M., 1902
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.