Improvements relating to Pneumatic Tires, and Means for Securing same, applicable to Cycles and the like.
Year: 1896

page_text: Date of Application, 15th July, 1896-4ccepted, 29th Aug., 1896
COMPLETE SPECIFICATION.
Improvements relating to Pneumatic Tires, and Means for Securing
same, applicable to Cycles and the like.
1, THOMAS GUTHRIE of 3 Thorney Terrace, South Shields in the County of
Durham, Decorator, 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 improvements relating to pneumatic tires and
means for securing same applicable to cycles and the like and has for its principal
object to effect the more easy detachment of the tire from the rim as after a
puncture or when required.
In effecting my purpose I secure the tire on the rim in a manner enabling me to
use an exceptionally light section or form of rim and I will proceed to explain my
improvements with reference to the accompanying drawings in which
Figure 1 shows a cross-sectional and part elevational view of a tire and rim,
Figure 2 showing the tire open as hereinafter described and in the following
description like letters of reference designate like parts.
Referring to the drawings, R is the rim T the tire and I is the inflation tube.
I construct the tire in the form of a circular and substantially flat band having
preferably thicker and thinner portions on it; thus there is a thickened portion
at P adapted to lie in the rim and on either side of this thickened portion the tire
may be of an uniform thickness as shown, the rubber r of the tire having a canvas
backing or lining L throughout its length and width.
The edges e of the band forming the tire are not provided with wires but with
for example cords C for the purpose of preventing fraying at the edges, for more
or less strengthening the tire and for forming a definite circumferential marginal
length less than the circumferential length measured along the centre line of
the tire.
To fit the tire, first lay the circular flat band on the rim, the centre of the band
being opposite the centre of the rim, and press the thickened band into the hollow
of the rim; then lay in the inflation tube and partially blow it up; then lap one
of the free sides (say S) of the tire band (it does not matter which) over the
inflation tube and having done this then lap the other free side (say S¹) over the
side already lapped and having arranged thein neatly in position, blow up tight.
The act of inflation has the effect of tightly binding the lapped tire on the
inflation tube as shown in Figure 1 and as the edges e of the band have as already
described a less circumference when in position on the tire than the circumference
due to the centre line of the tire it is evident that until deflation takes place the
tire must be held with perfect security.
By the act of deflation the tire of course at once collapses and the folds can
be removed and the inflation tube exposed without any force or skill on the part of
the attendant.
Owing to there being no mechanical connection such as wires or the like between
the tire and the rim the latter can be materially reduced in width and weight.
The risks of damage to the inner tube in opening the tire and of "nipping" are
both practically abolished.
The tire will fit a variety of rim sizes and is itself substantially airtight even
without the aid of the inner tube.

page_text: The thickened portion of the tire is so constructed that when in its position in
the rim it is considerably stretched which has.the effect of helping to bind the tire
to or in the rim.
It will be observed that there is a space M between the edge e of the tire and
the edge of the rim and for uniformity of appearance if so desired I sometimes
employ a tapered flap such as F (shown in dotted lines in Figures 1 and 2) the
thinner edge of which may extend nearly to the rim.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
1. A tire consisting of a circularly formed flat band, having strengthened edges,
arranged to be held on the rim and to embrace within its sides when folded the
inflation tube, the pressure of inflation serving to bind the tire round the tube and
to secure it in position substantially as and for the purposes herein set forth.
2. The improved construction of tire and mode of securing same on and in the
rim arranged and adapted for use substantially as herein described and illustrated
in the accompanying drawings.
Dated this 14th day of July 1896.
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent.