초록 ▼

The present disclosure concerns an emergency traction device that may be easily and securely fitted on vehicles having tires of different diameters and widths. A single winch sizes and secures the traction device for the proper tire diameter and then for the proper tire width. Traction can be furthe

The present disclosure concerns an emergency traction device that may be easily and securely fitted on vehicles having tires of different diameters and widths. A single winch sizes and secures the traction device for the proper tire diameter and then for the proper tire width. Traction can be further enhanced with members that substantially circumscribe the tire. Operation of the traction device can be enhanced by providing nonreversible gearing for operating the winch.

대표청구항 ▼

1. A traction device for attachment with respect to a tire rotating on an axis, the tire having a terrain-engaging surface connecting a pair of sidewalls, said traction device comprising:a plurality of arms adapted to extend radially with respect to the axis, each of said plurality of arms including

1. A traction device for attachment with respect to a tire rotating on an axis, the tire having a terrain-engaging surface connecting a pair of sidewalls, said traction device comprising:a plurality of arms adapted to extend radially with respect to the axis, each of said plurality of arms including a first section adapted to be radially extensible with respect to terrain engaging surface and a second section adapted to be extendable across the terrain engaging surface, each of said plurality of second sections being mounted at a radially outward end of a corresponding one of said plurality of first sections; a plurality of fingers adapted to engage one of the pair of sidewalls, each of said plurality of second sections extensibly connecting a corresponding one of said plurality of first sections and a corresponding one of said plurality of fingers; a winch including a cable drum and a plurality of cables, each of said plurality of cables extending from a corresponding one of said plurality of fingers, along corresponding ones of said first and second sections, to said cable drum; a plurality of first springs each expanding a corresponding one of said first sections; a plurality of second springs each expanding a corresponding one of said second sections; a hinge joint mounting each of said plurality of second sections at said radially outward end of said corresponding one of said plurality of first sections; and at least one detent resisting pivoting movement about each hinge joint; wherein each of said first springs has a lower spring constant than a corresponding one of said plurality of second springs.