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Automatic tire pressurizing system

  • US 4,651,792 A
  • Filed: 07/02/1984
  • Issued: 03/24/1987
  • Est. Priority Date: 07/02/1984
  • Status: Expired due to Term
First Claim
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1. Pneumatic tire pressurizing means for automatically pressurizing a load-bearing tire during the rotation thereof, comprising a pump housing, an attaching base for attaching said pump housing to the interior surface of a tire at a location adjacent the exterior road contact surface of the tire, conduit means for supplying air from outside the tire to said pump housing, pump means in said pump housing for drawing air through said conduit means and for pressurizing the air for delivery to the interior of the tire, said pump housing and pump meams being entirely inside the tire and attached to the tire only by said attaching base, said pump means including an actuating member supported for movement relative to said pump housing in a direction generally radial with respect to the tire between a radially inward first position and a radially outward second position, and first biasing means for urging said actuating member toward said first position, wherein said pump housing is deflected from a circular orbital path around a rotating tire when said pump housing enters the flattened load-bearing portion on which a load-bearing tire rests, said first biasing means yielding to centrifugal force and inertia acting on said actuating member when said pump housing is deflected from a circular orbit to permit said actuating member to follow a different orbital path from said pump housing such that said pump housing and said actuating member are moved relative to one another toward said second position against the force of said first biasing means, said actuating member being subsequently returned to said first position by said first biasing means, whereby reciprocating relative motion is induced between said pump housing and said actuating member to operate said pump means during each rotational orbit of the tire.

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