Self-contained anti-skid device for pneumatic tires

A self-contained anti-skid device for use with a pneumatic tire to increase traction of the tire against a slippery surface comprising:

• (a) a plurality of projectable and retractable anti-skid pins to be implanted radially at a tread of the tire;
• (b) a plurality of expandable pneumatic chambers adjacent to the anti-skid pins to project the anti-skid pins from the outer peripheral surface of the tire tread when said expandable pneumatic chambers are pressurized by a flow of pressurized air from the actual pressurized air of the tire;
• (c) a plurality of adequate supports of sufficient size and strength accommodating the anti-skid pins and positioned to form hollow cells to store and seal the anti-skid pins and the expandable pneuatic chambers from the pressurized air of the tire;
• (d) an air recycling device actuated by means of rotation of the tire on a surface for pumping air from the expandable pneumatic chambers into the tire;
• and
• (e) a controllable air valve to direct a flow of air selectively from the tire to the expandable pneumatic chambers and from the expandable pneumatic chambers to the air recycling device.

A self-contained anti-skid device for use with a pneumatic tire to increase traction of the tire against a slippery surface comprising:

• (a) a plurality of projectable and retractable anti-skid pins to be implanted radially at a tread of the tire;
• (b) a plurality of expandable pneumatic chambers adjacent to the anti-skid pins to project the anti-skid pins from the outer peripheral surface of the tire tread when said expandable pneumatic chambers are pressurized by a flow of pressurized air from the actual pressurized air of the tire;
• (c) a plurality of adequate supports of sufficient size and strength accommodating the anti-skid pins and positioned to form hollow cells to store and seal the anti-skid pins and the expandable pneumatic chambers from the pressurized air of the tire;
• (d) a controllable air valve to direct a flow of air selectively from the tire to the expandable pneumatic chambers and from the expandable pneumatic chambers to the atmosphere;
• and
• (e) an air recycling device actuated by means of rotation of the tire on a surface for pumping sufficient air from the atmosphere into the tire.

A self-contained anti-skid device for use with a pneumatic tire to increase traction of the tire against a slippery surface comprising:

• (a) a plurality of projectable and retractable anti-skid pins to be implanted radially at a tread of the tire;
• (b) a plurality of expandable pneumatic chambers adjacent to the anti-skid pins to project the anti-skid pins from the outer peripheral surface of the tire tread when said expandable pneumatic chambers are pressurized by a flow of pressurized air from the actual pressurized air of the tire;
• (c) a plurality of adequate supports of sufficient size and strength accommodating the anti-skid pins and positioned to form hollow cells to store and seal the anti-skid pins and the expandable pneumatic chambers from the pressurized air of the tire;
• (d) an air storage chamber of sufficient size and strength for temporary storage of air released from the expandable pneumatic chambers until such air is gradually recycled back to the tire;
• (e) an air recycling device actuated by means of rotation of the tire on a surface for pumping air from the air storage chamber into the tire;
• and
• (f) a controllable air valve to direct a flow of air selectively from the tire to the expandable pneumatic chambers and from the expandable pneumatic chambers to the air storage chamber.