Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
1998-12-15
2001-10-02
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S554000, C152S559000
Reexamination Certificate
active
06296030
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns a wheel—by which is meant the combination of a rim and tire and more particularly, such wheel specifically for a forklift truck or similar vehicle.
2. Description of the Related Art
Such vehicles ordinarily, in the interests of small size and maneuvrability, have wheels of small diameter. Such vehicles also require brake drums of as large a diameter as possible, on account of their need to brake at frequent intervals, to ensure adequate stopping power, reasonable working life, and tolerable increases in brake temperature. The brake drums are ordinarily fitted within the rim inside diameter.
For these reasons, tires having inner tubes on existing flat-base rims are normal, tubeless tires requiring rims with deep annular wells (to enable fitting of the tires) which necessarily reduce the diameter of brake drums which might otherwise be used.
Tires with inner tubes and flaps are clearly more costly than tubeless tires as are the multi-piece rims which carry them.
BRIEF SUMMARY OF THE INVENTION
The present invention is based on an appreciation of the possibility of providing a heavy gauge wheel having a rim adapted to be fitted with a tubeles tire and with the rim having an internal diameter comparable with or larger than that of a rim adapted to be fitted with a tire of the kind having an inner tube by using a tire of lower aspect ratio than has been used hitherto and at the same time maintaining the same outside diameter and width as a tube type tire.
According to the invention there is provided a tire and wheel assembly for a forklift truck or similar vehicle comprising a rim having an annular well to enable fitting of a tubeless tire and a tire having an aspect ratio of 58% or less.
A series of tires with the following dimensions exemplify preferred assemblies:
OD
TIRE-WIDTH
RIM DIAMETER
±7%
±7%
±10%
33.5″ (85 cm)
9.0″ (22.8 cm)
23.0″ (58.4 cm) × 7.25 (18.4 cm)
26.5″ (67 cm)
10.0″ (25 cm)
17.5″ (44.4 cm) × 7.25 (18.4 cm)
26.5″ (67 cm)
8.0″ (20 cm)
17.5″ (44.4 cm) × 6.0 (15 cm)
23.0″ (58.4 cm)
7.5″ (19 cm)
15.0 (38 cm) × 6.0 (15 cm)
21.0″ (53 cm)
6.5″ (16.5 cm)
14.0 (35.5 cm) × 5.0 (12.2 cm)
18.0″ (45.7 cm)
5.5″ (14 cm)
12.0 (30. cm) × 4.25 (10.8 cm)
Whereas tires having such low aspect ratios and special sizes would be quite unsuitable for many applications such as conventional highway truck tires, they have advantage for the contemplated applications in providing for much greater stability for forklift trucks. Better braking because the use of larger brakes is possible. Also much higher carrying capacity.
For the avoidance of confusion, we hereby confirm that the term “aspect ratio” as used herein is the ratio of the radial thickness to the width of the tire.
The tire must have the fabric of its cross plies extending up the inner face of the side walls of the tire to cover at least 30% of the height of the side walls. This additional stiffness will increase the tire's stability.
The tire should be inflated to a pressure of at least 125 p.s.i.(9 bar).
REFERENCES:
patent: 3068926 (1962-12-01), Jacob et al.
Bracewell & Patterson LLP
Johnstone Adrienne C.
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