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US 4,360,153 AGranted
Foldable traction-mat for motor vehicles
OwnerRichard Mantion, Jean-Paul Normandeauinventors
Life of this patent
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Abstract
An improved, foldable traction mat comprising a plurality of bars pivoted together to form a grid-like traction member when the mat is opened up for use. The bars pivot into generally parallel, closely adjacent position when the mat is folded up for storage.
Claims7
A traction mat comprising:
- a first set of traction bars arranged end to end and joined together at their adjacent ends by first pivot means;
- a second set of traction bars, equal in number to the first set, arranged end to end and joined together at their adjacent ends by second pivot means;
- the bars in both sets being arranged with their wide sides facing each other, each bar of the first set crossing a corresponding bar of the second set generally at their mid-points;
- third pivot means pivotably connecting each crossed pair of bars together;
- wherein the end portions and the central portion of each bar are twisted about the longitudinal axis of the bar to be ninety degrees out of phase with the remainder of the bar, and
- wherein the end and central twisted portions are sized to have the transition portion on one bar extending between the twisted and untwisted portions, interfering with the twisted portion of an adjacent bar to limit movement between the bars.
3 more elements
A traction mat comprising:
- a first set of traction bars interconnected end-to-end and standing on edge;
- each bar of this first set being, at the interconnected ends and at the center thereof, twisted out of the plane of the remainder of the bar to define flat lands, the lands of interconnected ends of adjacent bars overlapping one another, and pivot means interconnecting said overlapping end lands;
- a second set of traction bars, equal in number to the number of bars of the first set, said bars of said second set being interconnected end-to-end and standing on edge;
- each bar of this second set being, at the interconnected ends and at the center thereof, twisted out of the plane of the remainder of the bar to define flat lands, the lands of interconnected ends of adjacent bars overlapping one another, and pivot means interconnecting said overlapping end lands of the bars of said second set, and
- wherein each bar of the first set crosses a corresponding bar of the second set with the central flat lands overlapping one another, and pivot means interconnecting said central overlapping lands.
2 more elements
Dependencies are inferred from the claim text.