Resilient tires and wheels – Tires – resilient – Anti-skid devices
Patent
1989-12-07
1992-12-15
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Anti-skid devices
152213A, 152221, 152175, B60C 2714
Patent
active
051708272
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION INTRODUCTION
The invention relates to a detachable anti-skid chain for a vehicle wheel, comprising articulated links and a snap closure which can connect together the ends of the chain which can surround the periphery of a vehicle wheel, and has parts with a contouring which increase the grip of the wheel on the ground, said chain having links which are in the form of clamps made of an elastically bendable plastic and each have a bottom part and side parts which are integral therewith and can grip around the sides of the wheel tire, while each bottom part with the two side parts forms such an elastic unit that the clamping on the tire or release of the tire is determined solely by the load placed on the clamp in question by the vehicle wheel.
Such a detachable anti-skid chain is known from DE-A-2,553,342. This known anti-skid chain comprises a number of clamps which are distributed at intervals along the periphery of the wheel, and which are connected together by means of side cords, which are in turn connected to each other by transverse elements spaced at intervals in the region which lies between the clamps in question.
This anti-skid chain is relatively complex in design and has the disadvantage that it is difficult to fit, despite the fact that the clamps can grip elastically around the wheel tires as soon as the wheel rolls onto a clamp and thereby takes this clamp from the spread open position to the closed position enclosing the wheel tire. The side cords and the transverse elements connecting them actually give rise to the risk that during fitting the interval between the clamps will not be ideal, which gives rise to difficulties when the chain ends are being connected to each other, i.e. during closing of the chain. The clamps already enclosing the wheel tires can no longer be pushed along the tire in the peripheral direction.
The object of the invention is to produce an anti-skid chain which is simple in design and does not have the disadvantages of the known chain when it comes to fitting.
This object is achieved according to the invention in that the chain is solely made up of clamps which are directly connected to each other in an articulated manner and have the contouring on their outside.
The articulated connection which permits no displacement in the peripheral direction, in conjunction with the clamping of the side parts of the wheel, in particular the side wall of the wheel tire, means that further clamping is unnecessary because there are no longer any length tolerances, and fitting is very simple because when the wheel is driven onto the chain lying stretched on the ground the first link and the subsequent links become clamped on the periphery of the wheel, following which a connection of the chain ends is all that is necessary.
The chain is therefore almost exclusively made up of clamps, i.e. essentially of a series of articulated parts, which simplifies the design.
This automatic clamping can be achieved in various ways. It is, for example, possible according to the invention to form the chain links in such a way that when not under load each bottom part is arched inwards, i.e. away from the bearing surface side, and the side parts form such a rigid elastic unit with the bottom part that when the bottom part is under load, the downward bending of the bottom part causes them to lie elastically against the sides of the wheel or its tire and be held there by friction contact. During driving onto the chain the clamping must be maintained to insure that the chain remains in place on the periphery of the wheel before the two ends are connected. This can be achieved through the fact that the bending bottom part which is arched when not under load is formed in such a way and is of such shape at the transition point to the side parts that after the bending under load, when the side parts rest against the sides of the wheel, the clamping is maintained.
It is also conceivable to achieve this through friction of the side parts of the link on the curved side walls of the tire of the
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Gangl Willibald
Urleb Alfred
Ball Michael W.
Lorin Francis J.
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