Pumps – Expansible chamber type – Valved piston
Reexamination Certificate
1999-12-11
2001-08-28
Thorpe, Timothy S. (Department: 3746)
Pumps
Expansible chamber type
Valved piston
C417S360000, C417S553000, C092S140000, C074S42100R, C074S42100R
Reexamination Certificate
active
06280163
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an air compressor, and more particularly to an air compressor having an increased operation effect.
2. Description of the Prior Art
Typical air compressors comprise a piston including a large amount of elements and members required to be manufactured and assembled together, such that the cost for the air compressors is greatly increased.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional air compressors.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an air compressor including a simplified piston for allowing the piston to be easily manufactured and assembled.
In accordance with one aspect of the invention, there is provided an air compressor comprising a housing including a tube extended upward therefrom, and including a passage formed therein and 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 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, the piston including a rod extended downward therefrom, the piston including an aperture formed therein for allowing air to flow into the housing via the aperture of the piston, means for resiliently blocking the aperture of the piston, the blocking means including a spring blade having a first end secured to the piston and having a second end resiliently blocking the aperture of the piston, a sealing ring received in the annular groove of the piston for making an air tight seal between the piston and the housing, 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 weight received in the casing and secured to the pivot shaft and rotated in concert with the gear, the weight including a pin extended therefrom and eccentric relative to the pivot shaft, the pin being coupled to the rod for coupling the piston to the weight 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: 1416696 (1922-05-01), Dennedy
patent: 1628096 (1927-05-01), Worth
patent: 2792790 (1957-05-01), Capps
patent: 3961868 (1976-06-01), Droege, Sr. et al.
patent: 4090410 (1978-05-01), Nakamura
patent: 5215447 (1993-06-01), Wen
patent: 5655887 (1997-08-01), Chou
Solak Timothy P.
Thorpe Timothy S.
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