Patent Application
20090159168
The present invention relates to a slip-proof cover for vehicle tires in adverse weather conditions, preferably ice or snow.
The cover is characterized by a configuration that makes it easy to mount, providing a high reliability and positional stability and good mechanical properties regarding the abrasion implied by its use in its intended conditions.
The cover is also characterized by a structure and composition of the slit that optimize its slip-proof capacities and its resistance to abrasion.
Driving a vehicle provided with inflatable tires on slippery surfaces such as snow or ice is dangerous, due to the sharp reduction of the coefficient of friction.
If the coefficient of friction is reduced by the presence of ice, the latter's stiffness requires the use of solutions based on metal protrusions or the like.
Tires are known with studs meant to insert in the ice or snow to improve the grip. These types of tires are used when there are snow or ice conditions at all times, such as for vehicles used in ski resorts.
In situations where an improved grip is occasionally required, such as when having to cross a snow-covered mountain pass, other auxiliary means are common that are easier to mount and remove, such as snow chains.
Auxiliary elements of this type use diverse attachment solutions that seek a simple installation.
Chains are bulky and take up significant space in the vehicle's luggage compartment. The stiffness of the chain allows it to stick in the snow; however, it also means that considerable stresses are applied on the tire surface, damaging it.
This damage is greater when there are areas without snow to cushion the impact of the chain on the ground. These areas are sometimes so short that it is not worth removing and installing the chains again.
Also known is the use of covers as alternatives to chains. In this sense must be cited European Patent with publication number EP1165329, which describes and protects a device that can be fitted on vehicle tires to increase the friction between the tire and the road.
The configuration of this cover consists of a belt that surrounds the tire with an oversize of 4%, its outer part being fully closed and its inner part having a strip with an elastic peripheral asymmetric tensor.
The present invention consists of a design of a cover with a fabric specifically conceived to withstand shear stresses, improve the grip and improve positional stability.
Features consistent with the principles of some embodiments of the present invention provide for a slip-proof cover for vehicle tires that consists of a main band made of high-strength textile material and symmetrically-arranged lateral elastic adjusters that facilitate mounting and removing it.
The high-strength central band includes of a swath of cord fabric made of several strands.
The presence of several strands allows increase the strength and thickness of each cord to provide a surface with a better grip on the slippery surface.
The main textile band includes cords of different thickness, providing the band with protrusions and irregularities that improve its adherence to the ground.
The fabric incorporates a textile ligament, preferably made of taffeta, which completes the composition of the fabric.
The main band is a swath cut along an angle from 45° to 90° so that fibers that were originally longitudinal and transverse will be at a 45° angle. Note that angles under 45° result in equivalent configurations, as the longitudinal fibers become transverse fibers.
The specific case in which the angle is 45° with variations of up to 10° in the orientation of the fibers is of particular interest. This inclination has been compared to the natural orientation of 90° and has been shown to improve the two variables of greatest interest: friction on slippery surfaces such as snow or ice and resistance to wear.
The reason for this is that the unraveling is minimized, as the forces act identically on all fibers. It must be pointed out that if the longitudinal or transverse fibers suffer greater loads or abrasion than the others the entire fabric is deteriorated. The ideal solution is to balance the external demands on the fiber between the fibers having one orientation and the other, to provide an optimum overall performance.
Possible cutting means are laser, scissors or heat soldering. In cases in which cutting produces localized fusion, cut ends show a lower tendency to unraveling before they are sewn.
The cover of the invention can be treated to control the proliferation of mites and bacteria. For this purpose, the cord that forms part of the cover is treated with an anti-mite and antibacterial product. The cover can be stored unused for a long time without developing bad odors and without becoming a source of proliferation of micro-organisms.
The description is completed with a set of drawings that illustrate exemplary embodiments of the invention without limiting it in any way.
On this fabric (1) a band (1.1) is cut along a 45° angle (α), which is considered most advantageous within the admissible range from 45° to 90° such that with respect to this band the longitudinal and transverse fibers will now be diagonal.
The main textile band may have cords of different thickness, providing the band with protrusions and irregularities that improve its adherence to the ground.
The fabric is made of a material with a high tenacity spun from several strands (this example uses from 5 to 9 strands) to provide a sufficiently coarse texture to improve adherence and increase its resistance.
The fabric (1) has been manufactured with a surface density from 0.3 to 1 Kg/m2 using taffeta ligament.
On this fabric (1) a rectangular oblique cut (α) is made at 45° with a length equal to the perimeter of the cover plus the width of the seam strips and a width greater than that of the tire.
Elastic adjusting straps (2) are incorporated on the sides of the cover that are fitted on either side of the tire to stabilize the installation.
The fabric used for the cover is preferably polypropylene due to its high tenacity, its water-repelling properties and recyclability.
Polypropylene has a low density, less than that of water, so that the cover made with this material has a lower weight than covers with the same volume made with higher density materials.
In a second exemplary embodiment the material of the cover is para-aramid fiber, which is very strong, fireproof and corrosion proof.
In another exemplary embodiment, the cover can be made of a closed annular piece with a seam (3) that joins the minor ends of the band (1.1).
This type of seams (3) are normally made by overlapping one end on the other, as shown in the top of
In the cover, the seam (3) is made by folding the ends outward and sewing at the points of contact of said ends.
The bottom part of
The piece can be constituted as an open rectangular piece with closure means at its ends.
These closure means are preferably VELCRO© strips.
The essence of this invention is not affected by variations of the materials, shape, size and arrangement of the component elements, described in a non-limiting manner that should allow its reproduction by an expert in the field.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200401719 | Jul 2004 | ES | national |
| 05381029.7 | Jun 2005 | EP | regional |
This is a continuation of U.S. patent application Ser. No. 11/180,698, filed Jul. 14, 2005, in the name of Sergio Lopez ROCA and Isaac Valls CHAPARRO and entitled SLIP-PROOF COVER FOR VEHICLE TYRES, which claims priority of European Patent Application No. 05381029.7, filed Jun. 14, 2005, and also of Spanish Patent Application No. ES 2004/01719, filed Jul. 14, 2004, which are herein incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11180698 | Jul 2005 | US |
| Child | 12392067 | US |
