Land vehicles: wheels and axles – Wheel – Skate wheel
Patent
1981-09-11
1984-06-12
Marmor, Charles A.
Land vehicles: wheels and axles
Wheel
Skate wheel
301 11R, 301 65, 301 97, 1523813, 152427, B60B 2100, B60C 2900
Patent
active
044537760
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a one-piece, cast vehicle rim, particularly designed for use with tubeless tires, having a rim portion with a drop-center portion, and a support ring for mounting the rim on a disc.
The known cast drop-center rims are disadvantageous, in that the valve holes are placed in the bottom wall of the drop center rim so that the valves are located between the drop-center portion of the rim and the brake drum. During long braking periods, the air temperature in the narrow annular slot between the rim and brake drum can reach several hundred degrees centigrade. As a consequence, the O-ring on the side adjacent to the brake drum can be heated to a temperature endangering the tightness of and the seal for the valve.
A further disadvantage relates to the removal of the rim, e.g. when a tire is replaced. In this case, the rim is often jammed onto the disc so that the rim caan only be removed after extensive efforts, sometimes causing damage to the rim and the disc.
BRIEF DESCRIPTION OF THE INVENTION
An object of the present invention is to provide a one-piece, cast vehicle rim which does not have the disadvantages mentioned above with regard to security and to replacement of tires.
Another object of the present invention is to provide a one-piece, cast vehicle rim having a valve hole for mounting a valve such that the valve is not subjected to high temperatures, does not interfere with replacement of the tires and is readily accessible.
A further object of the present invention is to provide a one-piece cast vehicle rim which can be produced at low cost.
Other objects, advantages and salient features of the present invention will become apparent from the following detailed description of a preferred embodiment of the present invention.
Briefly described, the present invention relates to a one-piece, cast vehicle wheel rim, particularly for tubeless tires comprising a rim portion and a support ring extending from the rim portion. The rim portion has a drop center portion between first and second side walls. The support ring mounts the rim on a disc and has a recess between its end areas. A valve hole is formed in the first side wall of the rim portion adjacent the recess for mounting a valve such that the valve extends into the recess.
The rim portion can include a shoulder extending from the first side wall in a direction opposite to the drop center portion. Radially extending ribs can connect the shoulder to the end areas of the support ring on opposite sides of the valve hole. The ribs can be angularly oriented toward each other in a radially outward direction and can be spaced from the valve hole by a distance between about 15 mm and about 30 mm.
When used in combination with another rim to form dual wheels, a coupling can be provided on the support ring for attaching the rim to the other rim. The coupling and recess permit the valve to be exposed for ready access.
The valve mounting arrangement of the present invention permits simpler valves to be used than those used in conventional vehicle rims so that valve costs can be reduced by as much as 50 percent. Also, the valve does not extend through the annual slot between the rim drop-center portion and the brake drum so that its O-ring is located out of the area subjected to extremely high temperatures, thereby improving the security and integrity of the seal.
In addition, the elasticity of the edge of the support ring is being improved. Thus, the rim, even after long use, can be easily removed from and remounted onto the disc.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring to the drawings which form a part of this Specification, and wherein:
FIG. 1 is a partial, side elevational view of a one-piece, cast vehicle wheel rim according to the present invention, in section taken along line I--I of FIG. 3;
FIG. 2 is an enlarged, partial side elevational view, in section, of a portion of FIG. 1 with a valve mounted in the valve hole; and
FIG. 3 is a partial front elevational view of the wheel rim of FIG. 1 viewed in the direction of the arrow A
REFERENCES:
patent: 2548928 (1951-04-01), Ash
patent: 2798529 (1957-07-01), Herzegh
patent: 2840133 (1958-06-01), Billingsley
patent: 3275378 (1966-09-01), Malthaner
patent: 3376076 (1968-04-01), Durrenmatt
patent: 3847442 (1974-11-01), Masser
patent: 4165131 (1979-08-01), Thompson
George Fischer Ltd.
Marmor Charles A.
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