Improvements in Vehiele Tires.
Year: 1898

page_text: Date of Application, 30th Aug., 1898-Accepted, 19th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in Vehiele Tires.
I, JAMES GODMAN RODGERS, of No. 94, North Simestone Street, in the City of
Springfield, in the County of Clarke and State of Ohio, United States of America,
Manufacturer, 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 to certain new and useful improvements in rubber vehicle
tires, having for its object to generally improve the construction and efficiency
of such tires and to render them less liable to be accidentally removed from their
seats upon a wheel. With this object in view the invention consists in the novel
construction, combination and arrangement of the parts hereinafter more fully
described.
In the accompanying drawings forming a part of this specification, and in
which like letters of reference indicate corresponding parts:
Figure 1 is a cross-sectional view of the improved tire;
Figs. 2, 3 and 4 are views illustrating different forms in which the tire section
can be made.
Referring more particularly to the drawings; A, designates the wheel rim,
formed preferably as shown with flaring annular side flanges 1, and with a
peripheral channel, and it is preferred to form this channel with a flat bottom
and with substantially flat sides which extend at an angle greater than a right
angle to the bottom.
Within the rim channel X, is a flexible yielding base section B, formed pre-
ferably of rubber, which conforms closely to the sides and bottom of the channel,
and may be secured thereto in any suitable manner, but preferably is stretched
to hug its seat tightly. The base section is therefore shorter than the periphery
of the rim, and is stretched, the ends being connected by any suitable fastening.
This base section is also preferably provided with a peripheral groove and with
outwardly flaring side flanges 2, which rest in contact with the rim flanges, but
terminate at points within the outer edges thereof. The peripheral groove of
the base section is preferably similar in contour to the rim channel, having sub-
stantially flaring sides, and within said groove is secured the base of a yielding
outer or tread section C, of rubber. This section instead of being under tension
like the base section is under compression, being longer than its seat in the base
section and compressed longitudinally to the proper dimensions, and the base
and tread sections are cemented together and to all intents and purposes are
practically integral forming a tire which is compressed at the outer periphery
and distended at the inner side and which therefore will not rub in the channel.
Considerable difficulty has been experienced heretofore in tires of this character
by reason of the yielding treads being forced out of their retaining rims by the
lateral strains imposed upon them, this in a great measure resulting from the
yielding qualities of the rubber which it has been necessary to use in order to
obtain the proper cushioning effect, especially when the tire is retained in the

page_text: channel by a single wire. This objection might be overcome in a large measure
by forming the tread of the tire of less resilient rubber, but it will readily be seen
that the advantage would be attained at the expense of lessening the yielding
efficiency of the tire. In order, therefore, to effect the permanent retention of
the rubber tire within the channel of the rim without at the same time decreasing
the resiliency of its tread portion, the base section B, of the tire is of rubber, the
yielding qualities of which are less than that of the tread section, C, and conse-
quently when the two sections are secured together, and within the rim channel,
any lateral strain imposed upon the other section will be transmitted to the inner
or base section, the relatively low yielding quality of which will prevent its being
stretched sufficiently to be forced without the rim channel even if it lay loosely
in the channel without being connected to the rim.
As an additional means of securing the tire within the rim A, the tread section
is provided with one or more annular, non-extensible retaining wires or strips 3,
which extends longitudinally therethrough and centrally with respect to the
width of the section and which owing to the compressed condition of the outer part
and the distended condition of the inner part of the tire will not creep and tear
the tire as results with ordinary constructions. In practice it is preferred to
vulcanize the tread section C, with a longitudinal opening extending therethrough,
and subsequently pass the retaining wire through the opening and secure its ends
together in some instances, however, a continuous wire ring may be embedded
in the rubber while in a green state and vulcanized therein. It will be under-
stood too, that in some cases more than one retaining wire may be employed,
according to the conditions which have to be met, the wires being passed through
the tread section parallel to and separated from each other. In every instance,
however, it is preferred to form the retaining ring of a diameter corresponding
to or less than the maximum diameter of the rim flanges. If desired clips 7 of
metal cord or other unextensible material may he embedded in the section B to
stiffen it.
In assembling the parts together, the section B, is first placed and secured under
tension in the channeled rim, and the continuous tread section C, is then forced
over the side flanges of the ring, and brought to its seat within the groove of the
base section, and finally it is cemented to said section.
It will be noted that the outer part (in my improved tire is wide enough to
wholly cover the inner portion. This prevents the wearing away of the inner
part forming side channels between the outer part and the side flanges which
results when the inner part is exposed at the sides of the outer part as heretofore.
Having now particularly described and ascertained the nature of the said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:
-
1st. The combination with a channeled rim, of a tire within the channel of the
rim comprising a base section, and a tread section formed separately, the base
section being under tension and the tread section under compression, substan-
tially as described.
2nd. The combination with a channeled rim, of a tire within the channel of the
rim comprising a channeled base section, and a tread section formed separately,
the tread section being under compression and within the channel of the base
section to completely cover the same, and the base section being under tension,
substantially as described.
3rd. The combination with a channeled rim, of a tire within the channel of
the rim comprising a base section of yielding material under tension, and a tread
section of yielding material under compression, the yielding qualities of the tread
section being greater than those of the base section, substantially as described.
4th. The combination with a channeled rim, of a tire within the channel com-
prising a base section of yielding material having a peripheral groove and a tread

page_text: section of relatively greater yielding material within said groove and a longi-
tudinal retaining wire passing through the outer section, substantially as described.
5th. The combination with a channeled rim, of a tire comprising a base section
of yielding material having a peripheral groove, and a tread section of relatively
greater yielding material provided with a continuous non-extensible retaining
ring of a diameter less than the maximum diameter of the rim, substantially as
described.
6th. The combination with a rim having a peripheral channel and annular out-
wardly flaring side flanges, of a tire comprising a base section of yielding
material conforming to the said channel and having a peripheral groove and a
tread section of yielding material within the groove provided with a continuous
non-extensible retaining ring, said tread section extending beyond the rim and
having its sides inclined inwardly from the side flanges of the rim, and com-
pletely covering the base section, substantially as described.
7th. The combination with a rim having a peripheral groove and annular out-
wardly flaring side flanges, of a tire within the channel comprising a base section
of yielding material conforming to the said channel and having a peripheral
groove and a tread section of relatively greater yielding material cemented within
the groove provided with a continuous non-extensible retaining wire, said tread
section extending beyond the rim and having its sides inclined inwardly from the
side flanges of the rim, substantially as described.
200
1000
BOULT & WADE,
Agents for the Applicant.