Resilient tires and wheels – Tires – resilient – Cushion and pneumatic combined
Reexamination Certificate
2000-03-17
2001-11-27
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Cushion and pneumatic combined
C152S454000, C152S516000, C152S523000, C152S544000, C152SDIG009
Reexamination Certificate
active
06321806
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pneumatic tire used together with a standard wheel rim, more particularly to an improved sidewall structure which can minimize bead unseating during the use of the tire, especially in the uninflated state.
2. Description of the Related Art
If the inner pressure of tire is decreased due to punctures and the like, the bead portions of the tire easily dislocate from the bead seats of the wheel rim and, at worst, the bead portions get over the rim flange.
In order to avoid such a dangerous situation, a special wheel rim has been proposed. However, in such a special wheel rim, it is difficult to mount and demount the tire. Therefore, the special rims hardly~come into the market.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide a pneumatic tire, in which accidental bead unseating can be minimized without using a special wheel rim which usually pose difficulties in mounting and demounting the tire.
According to the present invention, a pneumatic tire which is adapted for a standard wheel rim, comprises
a tread portion,
a pair of sidewall portions,
a pair of bead portions,
a carcass extending between the bead portions,
a rim flange holder disposed on each side of the tire and protruding axially outwardly so as to overhang a flange of the standard wheel rim,
the rim flange holder having a hooking part extending radially inwardly on the axially outside of the flange so as to hook the flange,
the radial measurement between the radially outermost point of the flange and the radially innermost point of the hooking part being at least 2 mm, and
the rim flange holder provided in the axial outer surface thereof with a slit extending axially inwardly therefrom.
Therefore, the bead portion can be prevented from dislocating axially inwards as the rim flange holder hooks the rim flange, and bead unseating in the uninflated state can be prevented.
Further, the slit can decrease a force which moves the hooking part radially outwards when the sidewall portion is inclined axially inwards as shown in FIG.
3
. Accordingly, bead unseating caused during cornering in the uninflated state can be effectively prevented.
Furthermore, the slit makes it relatively easy to change the shape of the rim flange holder during mounting the tire on the wheel rim. Accordingly, bead rotation about the bead toe becomes relatively easy. Therefore, the efficiency of mounting operation can be prevented from decreasing.
REFERENCES:
patent: 2874745 (1959-02-01), Wann
patent: 4057092 (1977-11-01), Tracy
patent: 4365659 (1982-12-01), Yoshida et al.
patent: 253413 (1963-02-01), None
Birch & Stewart Kolasch & Birch, LLP
Johnstone Adrienne C.
Sumitomo Rubber Industries Ltd.
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