Resilient tires and wheels – Tires – resilient – Armored
Patent
1994-08-11
1996-09-17
Johnstone, Adrienne C.
Resilient tires and wheels
Tires, resilient
Armored
152197, 152454, 1523331, 1523341, 1523351, 1523371, 1523381, 152540, 152544, 152558, 1561101, 156125, B60C 300, B60C 524, B60C 15024, B60C 1504
Patent
active
055564887
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a tire formed of a plurality of pneumatic sectors mounted on a single rim and circumferentially adjacent to each other, each sector being inflated and removable so that it can be easily replaced in the event that it is damaged. The invention also relates to the assembly consisting of the tire and a mounting rim which is adapted to the sectors of said tire.
Although all types of tires can be concerned, it is known that it is the tires for construction equipment used in open-cut or underground mines and construction sites of all types which are subject to numerous types of aggressive action by the ground. They, therefore, more than any other tire, require frequent removal, repair, and remounting, unless they are to be considered scrap and, in the worst case, discarded before they have are worn. As the dimensions of the tires concerned are the largest and are furthermore increasing all the time, the problems have become worse: the removal, repair, and remounting require larger and larger and more and more costly means.
Furthermore, for their manufacture such tires require equipment which is becoming immense, whether for building, curing, or maintenance, while the storage areas required are becoming excessive. In view of the increase in the existing dimensions which are desired by the manufacturers and users of construction equipment, another problem exists, namely that of the transporting of such tires.
The principle of manufacture of a tire made of several inflatable sectors which are independent from each other and can be removed individually from the rim, is widely known in the prior art and mention may be made of U.S. Pat. Nos. 1,233,853, 1,311,806, 1,322,685 and 4,153,094. These patents, most of which are now old, concern either closed pneumatic sectors, or systems permitting these sectors to be air-tight. U.S. Pat. No. 4,153,094, in particular, describes a system of attachment in which a circular bead wire reinforces the circular bead of a pneumatic sector. This bead wire being pierced with holes along its periphery, the sector is then attached by screwing to a plate which, in its turn, is fastened to a flat rim.
SUMMARY OF THE INVENTION
The present invention meets a twofold concern. First of all, the inflatable removable sectors must withstand the aggressive action of the ground, whether individually or as a whole. As a matter of fact, upon travel, several sectors are simultaneously loaded and in contact with the ground: a certain coherence between sectors is necessary in order for the forces to be distributed over all the sectors concerned. Secondly, the removable sectors must have a structure such that their mounting on the rim and removal from it is easy and rapid.
Thus, in accordance with the invention, the tire formed of several identical inflatable, removable pneumatic sectors which are circumferentially adjacent when mounted on a suitable rim with circularly continuous base, is characterized by the fact that each sector, which has a height on rim (H), a meridian width (B), and a circumferential width (C) comprises a tread connected to four sidewalls, two of these sidewalls being circumferentially adjacent to the sidewalls of the neighboring sectors and the other two forming the sidewalls of the tire, these sidewalls terminating respectively in meridian beads not connected to the mounting rim and reinforced by meridian bead wires and by circumferential beads which assure the mounting of the sectors on the rim and are reinforced by circumferential bead wires connected to the meridian bead wires and to which at least one reinforcing armoring of non-stretchable cords or cables is anchored, said reinforcing armoring being radially adjacent, at the top of the sector, to at least one reinforcement armoring of the tread.
The reinforcing armoring may be formed of at least one ply of radial cords or cables, that is to say in planes containing the axis of rotation of the tire. It may also advantageously be formed of at least two plies of cord
REFERENCES:
patent: 1104426 (1914-07-01), Keller et al.
patent: 1233853 (1917-07-01), Drummond et al.
patent: 1311806 (1919-07-01), Coats
patent: 1322685 (1919-11-01), Franklin
patent: 2680464 (1954-06-01), Bonmartini
patent: 4153094 (1979-05-01), McKenzie
Gergele Jean
Le Gall Armand
Pompier Jean-Pierre
Remond Michel
Compagnie G en erale des Etablissements Michelin - Michelin & Ci
Johnstone Adrienne C.
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