Resilient tires and wheels – Tires – resilient – Anti-skid devices
Patent
1988-10-25
1989-10-24
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Anti-skid devices
B60C 1116
Patent
active
048755150
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a sleeve-mounted spike fitted on a vehicle tire, comprising a rivet, a head, a tip and a sleeve.
It is a drawback of sleeve-mounted spikes known in the art that, particularly in those situations when the vehicle is being accelerated or braked or is slipping sidewise, good gripping properties of the spiked tire are required. Good enough griping properties are not achieved in the situations mentioned with sleeve-mounted spikes known at present because the pressure of the rubber material acting on the flange of the spike's rivet is not able to keep the spike sufficiently extruded in a tire slipping situation, whereby the spike will abrade ice. On the other hand, this so-called punching force must not be very high so as to cause no major road attrition effect.
SUMMARY OF THE INVENTION
The object of the invention is to provide an improvement of sleeve-mounted spikes known at present. The more detailed object of the invention is to provide a sleeve-mounted spike which affords substantially better gripping properties in situations when the vehicle is being accelerated or braked or is slipping sidewise.
The aims of the invention are achieved with a sleeve-mounted spike which is mainly characterized in that the part of the rivet towards the tip and the part of the rivet towards the head subtend an angle having a magnitude between 150 and 179 degrees, whereby no rectilinear contact obtains between the rivet and the sleeve, the result being that in situations in which the vehicle is being accelerated or braked or is slipping sidewise the spike is being urged against the sleeve, a higher force is required to push the rivet into the tire rubber, without however arresting the movement of the rivet in the sleeve.
As taught herein, said angle is advantageously in the range from 160 to 178 degrees.
According to the fundamental insight of the invention, the part of the rivet towards the tip increases in diameter towards the tip, or on the part of the rivet towards the tip a discontinuity has been produced in another way, and/or similarly the part of the rivet towards the head increases in diameter towards the head, or on the part of the rivet towards the head a discontinuity has been produced in another way. It has thus been understood in the design of the invention to shape the rivet in such a way that the line of contact between it and the sleeve is not rectilinear and instead forms an obtuse angle having the above-mentioned magnitude. When the rivet is urged against the sleeve in situations in which the vehicle is being accelerated or braked or is slipping sidewise, a greater force is required to push the rivet up because as the rivet is being pushed up it has to move against the forces resulting from the acceleration, braking or side-slipping situations. In this way a higher gripping force is obtained, without arresting the mobility of the rivet within the sleeve.
In an advantageous embodiment of the invention, at least the part of the rivet towards the tip increases in diameter towards the tip.
In an advantageous embodiment of the invention, the sleeve has been shaped so that the hole for the rivet in the sleeve has been disposed to increase in diameter towards the tip.
In an advantageous embodiment of the invention, the clearance between sleeve and rivet is symmetrical, and the clearance between sleeve and rivet is larger in the region of the part of the rivet towards the tip than in the region towards the head.
In one embodiment, said clearance is in the above-mentioned regions equal in size over the entire region.
In another embodiment the clearance is equal in size over its entire length.
In an advantageous embodiment of the invention, the clearance between the sleeve and the rivet is asymmetrical. The clearance may then increase in the direction towards the tip.
Significant advantages are gained with the sleeve-mounted spike of the invention. In a situation when the tire is slipping, as the rivet is urged against the sleeve, the discontinuity on the bo
REFERENCES:
patent: 3786849 (1974-01-01), Loqvist
Ball Michael W.
Neste Oy
Wilber Gregory J.
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