Pumps – With signal – indicator – or inspection means
Reexamination Certificate
1999-12-11
2001-04-10
Walberg, Teresa (Department: 3742)
Pumps
With signal, indicator, or inspection means
C417S415000, C417S526000
Reexamination Certificate
active
06213725
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a compressor, and more particularly to a compressor having an improved piston.
2. Description of the Prior Art
Typical compressors comprise a piston slidably received in a piston housing and a sealing ring solidly engaged on the piston and engaged between the piston and the piston housing, such that the typical piston or the sealing ring may be easily damaged. In addition, a number of valve members are required for controlling the air into and out of the piston housing.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional compressors.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a compressor includes a piston having a sealing ring loosely engaged thereon for preventing the sealing ring from solidly engaging with the piston housing and for preventing the piston from being easily damaged.
In accordance with one aspect of the invention, there is provided a compressor comprising a housing including a tube extended upward therefrom, and including a passage communicating the housing with the tube, the housing including a chamber formed therein, the tube including a pipe extended outward therefrom, a pressure gage connected to the pipe, a check valve including a valve member and a spring received in the tube for controlling an air flow passage from the housing to the pipe, a piston slidably received in the chamber of the housing, the piston including an outer peripheral portion having an annular groove formed therein, and including an upper portion having at least one notch formed therein and communicating with the annular groove of the piston, the piston including a rod extended downward therefrom, the annular groove of the piston including an upper portion having a size greater than a lower portion of the annular groove of the piston, a sealing ring loosely received in the annular groove of the piston and movable between the upper portion and the lower portion of the annular groove of the piston, the notch of the piston being communicating with the annular groove of the piston and being communicating with the chamber of the housing when the sealing ring is engaged in the upper portion of the annular groove of the piston, a base secured to the housing, and means for forcing the piston to move along the chamber of the housing in a reciprocating action, the forcing means including a motor secured to the base and having a pinion provided thereon, a gear rotatably secured to the base at a pivot shaft and engaged with the pinion and driven by the motor via the pinion, the gear including a first half having a plurality of first teeth and including a second half having a plurality of second teeth, the first teeth including a size greater than that of the second teeth, the gear including a casing provided thereon, and a block received in the casing and secured to the pivot shaft and rotated in concert with the gear, the block including a pin eccentric relative to the pivot shaft and coupled to the rod for coupling the piston to the block and the gear.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.
REFERENCES:
patent: 1470548 (1923-10-01), Spohrer
patent: 4023467 (1977-05-01), Thurner
patent: 5215447 (1993-06-01), Wen
patent: 5655887 (1997-08-01), Chou
patent: 5681154 (1997-10-01), Yang
patent: 6065947 (2000-05-01), Wu
Van Quang
Walberg Teresa
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