Improvements in and relating to Pneumatic Tyres.
Year: 1896

page_text: Date of Application, 21st July, 1890
Complete Specification Left, 21st Apr., 1897-Accepted, 17th July, 1897
Date
1090
Complete Specification Left, 21st Apr., 1897-Accepted, 17th July, 1897
PROVISIONAL SPECIFICATION.
Improvements in and relating to Pneumatic Tyres.
I, WILLIAM THOMAS ROBBINS of 274, Albany Road, Camberwell, in the County
of Surrey, Pneumatic Tyre Manufacturer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to an improvement in pneumatic tyres and it has for its
object attaching the cover to the wheel rim in a manner which permits of it being
more readily mounted and dismounted than at present obtains.
The cover is formed of an arch-shape or approximately arch-shape in cross
section, of rubber reinforced with canvas in the well-known manner, each edge of
the cover being provided with a pocket.
In each pocket in the cover is placed a hoop or ring in the shape of a flat band
the width of which is greater than its thickness. The hoops or rings may be
made of cane, vulcanite or other similar fibre capable of slight expansion or
compression, or they may be made of metal in which case they are each composed
of a series of short lengths jointed together in any convenient manner.
The construction or composition of the said hoops or rings is such that in their
normal state their widths are parallel to their axes but on inflation of the air tube
within the cover they are caused to turn over until their wi Iths are radial to their
axes. The diameter of these hoops or rings is such that they will just pass over
the edges of the wheel rim--which may be of any convenient section-wben in
their normal state, but when they turn over on the inflation of the air tube as
before described their inner diameters become less thus confining the edges of the
tyre cover in the wheel rim.
ROBERT E. PHILLIPS, Assoc.M.Inst.C.E., M.I.Mech. E.
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.
improvements in and relating to Pneumatic Tyres.
I, WILLIAM THOMAS ROBBINS of 274 Albany Road Camberwell in the County
of Surrey Pneumatic Tyre Manufacturer, do hereby declare the nature of my
said invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
The object of my invention is to effect improvements in and relating to

page_text: Pneumatic Tyres whereby the cover or jacket is more readily attached to or
removed from the rim.
According to my invention I provide each edge of the cover or jacket with a
flat band of cane, vulcanite or analagous fibre or material, such bands being capable
of a slight expansion or contraction or each edge of the cover may contain two or
more thin bands of cane vulcanite etc. These bands are so arranged that when
their widths are parallel with their axis that is to say in their normal position the
cover is readily removed from the rim as hereinafter described, the bands being
of slightly smaller diameter than that of the edges of the rim on inflating the
inner tule the bands turn over so that their widths assume a position at right
angles to the axis whereby the internal diameter of the bands is compressed to a
still smaller diameter thus securing the cover to the rim.
And in order than my said invention may be particularly described and ascer-
tained reference is hereby made to the accompanying drawings in which similar
letters of reference indicate corresponding parts.
Figure 1 is a section of a pneumatic tyre showing the hands with their widths at
right angles to their axis in which position they are held by the pressure of air
in the inner tube.
Figure is a section of a pneumatic tyre illustrating the method of detaching
the cover from the rim the cover being shewn provided with two bands in each edge.
(a) is the rim which is formed with approximately vertical sides . c is the
cover or jacket the edges of which are formed with pockets in which one or more
band or bands d is or are placed. e is the inner or inflatable tube.
In their normal state the bands d assume the position illustrated at the upper
right hand side of Figure 2 in which position the diameter of the band is smaller
than the diameter of the edge of the rim.
When air is being pumped into the inner tube e the bands are turned over by
the pressure of the air, the edges of the bands being thereby varied in diameter
the inner diameter having become smaller than that of the edge of the rim thus
securing the cover on the rim.
In order to detach the cover from the rim the sides are pinched together with
the hands thus forcing the bands to the bottom of the rim. One portion of the
cover is then raised as shewn at the upper portion of Figure 2 when the band can
be readily passed over the edge of the rim thereby allowing the inner tube to
be withdrawn.
will thus be seen that the hand must be capable of a slight expansion and
compression in order that the band may accommodate itself when turned over.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
elain is:-
1. The improved method of securing the covers of pneumatic tyres to rims
substantially as set forth.
2. In pneumatic tyres the application and use of bands hoops or rings of cane
vulcanite or analogous fibre or material so arranged that when in their no: mal
state that is to say when their width is parallel with their axis the diameter of
the band is slightly smaller than that of the edge of the rim and when turned
over by the pressure of air in the inner tube the inner diameter of the bands is
still further reduced below that of edges of the rim, substantially as hereinbefore
described and illustrated by the drawings.
D100th
100%