Brakes – Vehicle – Wheel and ground
Patent
1990-02-16
1993-08-17
Oberleitner, Robert J.
Brakes
Vehicle
Wheel and ground
180 16, B62D 5700
Patent
active
052360679
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for varying, at the discretion of the operator, the friction coefficient and the contact pressure between the tread of the wheels and the road surfaces by inserting fins of varying characteristics, or more in particular to a treading device which is simple, light and small, yet durable.
BACKGROUND ART
A means has been widely used to vary the friction coefficient and contact pressure of a wheel by interposing an anti-skid deterrent between the wheel and the road surface. For this purpose various anti-skid deterrents and devices are known. For example, in order to prevent skidding on frozen roads, sand and caterpillar tread devices or caterpillars have been commonly used.
The drawback of sand strewn on frozen roads for skid prevention is that it can be used only in limited areas because of the amount needed and the cleanup required afterwards.
Caterpillars are used for military tanks, snow mobiles and construction machines. However, caterpillars are not only difficult to attach and remove; but are heavy themselves.
In order to overcome these drawbacks, studded tires or anti-skid chains have been used on frozen roads. However the present studs and chains are still difficult to attach and remove, through not as difficult as caterpillars. Consequently many drivers leave them on continuously even when they are unnecessary on normal roads. Therefore their use results in damaged roads, giving rise to wheel dust pollution and also damaging the studs or the chains. In addition, their use is accompanied by other problems like fuel waste and unpleasant driving.
In order to solve the above mentioned problems, various inventions have been devised to make it possible to interpose an anti-skid deterrent only when necessary. For example, in a specification of JP. A, 54-151202 (GORAN TORNEBACK) or British patent 110,674 (HAROLD THORNE), relevant devices are shown which use a bunch of short chains consecutively inserted under a tire or trodden as anti-skid deterrents. In these devices chains rotated about a center are imposed under a wheel by the centrifugal force due to the gyration of the chains. Therefore they can work when going up a slope or starting, and can be used only when necessary. However, one drawback is that the chains cannot be imposed under a wheel when braking because of the absence of gyration.
In order to solve this shortcoming, German patent--DE, B, 1162216 (HANNS SCHNITZLER) is known to work when braking. In this specification a treading device with elastic anti-skid blades are attached to a gyrating boss. When the gyration centers of the boss and the wheel are at the appropriate positions with respect to the advancing direction of the wheel, this circular motion device enables the treading or imposition of the elastic anti-skid blades under the wheels when accelerating as well as braking. Such skid prevention function can be enhanced when studs are attached to the anti-skid blade.
However, the devices based on the circular motion as shown in the above-mentioned specifications have three serious faults which are interrelated to one another. Therefore none of these means have proven to be practical. These faults are as follows; durable.
The main reason is the locus difference on the road between the tread of the tire and the blade of the anti-skid device--the former along a linear line with no lateral component and the latter having a quasicycloid resultant between the gyration of the blade and the vehicle motion. The moving length of a blade under the tread is shorter than the length of the tread. Therefore the effects of the locus difference seem insignificant.
However, experiments have shown the enormous effects of the difference. In order to discuss the motion in detail, the tire tread on which the anti-skid blade moves can be divided into two parts--1) the half between the tread front and the center and 2) the half between the center and the tread tail. In the first half, the trodden part of the blade becomes wider toward the connected end
REFERENCES:
patent: 3428151 (1969-02-01), Franklin
patent: 4732239 (1988-03-01), Hardmark et al.
Muratori Alfred
Oberleitner Robert J.
LandOfFree
Treading device for wheels does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Treading device for wheels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Treading device for wheels will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2238157