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Compressor for tire inflating combination

Compressor for tire inflating combination description/claims

The present invention is a continuation-in-part of U.S. patent application Ser. No. 11/022,349, filed 22 Dec. 2004, pending and to be abandoned.

1. Field of the Invention

The present invention relates to a tire inflating combination, and more particularly to a tire inflating combination including an air compressor assembly having an improved sealing ring for facilitating a sliding engagement between a piston and a cylinder housing which includes an inclined inner peripheral surface.

2. Description of the Prior Art

Various kinds of typical air compressors have been developed and comprise a piston slidably engaged within a cylinder housing and movable relative to the cylinder housing in a reciprocating action, to pump air and/or to generate pressurized air, for inflating tires, or the like.

For example, U.S. Pat. No. 6,205,918 to Kumai et al., and U.S. Pat. No. 6,213,725 to Chou disclose two typical air compressors each comprising a piston slidably engaged with an inner peripheral surface of a cylinder housing, and a sealing ring engaged between the cylinder housing and the piston, for making an air tight seal between the cylinder housing and the piston.

In these typical air compressors, the piston is solidly secured to the piston rod, and will be moved in concert with the piston rod, and thus will be tilted relative to the cylinder housing when the piston rod is driven by a motor. However, the sealing ring may be disengaged from the cylinder housing when the piston is moved to bottom or outer end of the cylinder housing, due to tilting or inclined status of the piston rod relative to the cylinder housing, such that the sealing ring may not be used to suitably make an air tight seal between the cylinder housing and the piston.

In addition, the inner peripheral surface of the cylinder housing is straight and may not be suitably made an air tight seal between the inner peripheral surface of the cylinder housing and the sealing ring of the piston.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the compressors.

The primary objective of the present invention is to provide a tire inflating combination including an air compressor assembly having an improved sealing ring for facilitating a sliding engagement between a piston and a cylinder housing which includes an inclined inner peripheral surface, and for suitably making an air tight seal between the cylinder housing and the piston.

In accordance with one aspect of the invention, there is provided an air compressor assembly comprising a base holder, a casing disposed in base holder, a cylinder housing including a chamber formed therein and defined by an inner peripheral surface, and including an outlet tube provided thereon, and a passage formed therein and communicating with the outlet tube, the outlet tube including a first outlet port formed therein for coupling to a hose, a second outlet port provided therein for coupling to a pressure gauge, and a third outlet port provided therein for coupling to a relief valve, the inner peripheral surface of the cylinder housing being tilted from one end to the other to form a frustum-shaped chamber, a piston slidably engaged in the cylinder housing, the piston including an outer peripheral groove formed therein and defined by a base peripheral surface and two side surfaces, to form an outer opening and an inner recess, the piston including a pathway formed therein for air flowing purposes and including a spring blade attached to block the pathway thereof when the piston is moved relative to the cylinder housing in a compressing stroke, the spring blade being forced to open the pathway of the piston when the piston is moved relative to the cylinder housing in a returning stroke, a motor for coupling to the piston, to move the piston in the cylinder housing in reciprocating action, the motor including a spindle having a pinion attached thereto, a gear rotatably received and engaged in the casing and rotatably engaged with the pinion for allowing the gear to be rotated and driven by the motor with the pinion, an eccentric member attached to the gear, and a shaft attached to the eccentric member and offset from an axle of the gear and coupled to the piston with a piston rod, the motor including a fan device attached thereto and rotated and driven by the motor to generate a cooling air, and a sealing ring engaged in the outer peripheral groove of the piston, for slidably engaging with the tilted inner peripheral surface of the cylinder housing, and for making an air tight seal between the cylinder housing and the piston, the sealing ring including a peripheral channel formed in an upper portion thereof, to form a base segment, an inner leg and an outer leg, the inner leg being engaged in the inner recess of the piston, and the outer leg being extended out of the outer opening of the piston, for slidably engaging with the inner peripheral surface of the cylinder housing, even when the piston is tilted relative to the cylinder housing, and the outer leg of the sealing ring including a flat surface formed in a free end portion thereof and parallel to the base segment thereof, and including an inclined surface formed in the free end portion thereof and formed beside the flat surface thereof,

The third outlet port of the outlet tube includes an inclined valve seat provided therein, and an inner thread formed therein for threading with a cap, the cap includes a bore formed therein and communicating with the outlet tube and the cylinder housing, for relieving over-pressurized air.

The relief valve includes a valve element slidably engaged in the outlet tube, and engageable with the valve seat of the outlet tube, and a spring member engaged between the valve element and the cap, for biasing the valve element to engage with the valve seat of the outlet tube.

Further objectives and advantages of the present invention will become apparent from a careful reading of the detailed description provided hereinbelow, with appropriate reference to the accompanying drawings.

FIG. 1 is an exploded view of a tire inflating combination including an air compressor assembly;

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• Utility Patent

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