Air compressor
OwnerWen-San Chouinventor
Life of this patent
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Abstract
An air compressor includes an air storage unit defining a first chamber and a cylinder containing a piston body. The top wall of the cylinder is formed with a tubular projection defining a bore to serve as a second pressure chamber. When the piston head of the piston body is almost in contact with the top wall of the cylinder, part of the compressed air can enter the second pressure chamber, so that the piston body can conduct reciprocation motion more smoothly. Furthermore, the cylinder has an open bottom that is divided into two halves according to a central vertical line of the cylinder, wherein one half of the open bottom is horizontal while the other half of the open bottom is slanted. When the piston body is at BDC, the piston head will be entirely within the cylinder and thus keep gas-tight with the cylinder.
Claims12
An improved air compressor including a main housing, a cylinder fitted with a piston body having a piston head, an air storage unit defining a first pressure chamber communicating with the cylinder, a motor fitted with a small gear at an axle thereof, and a large gear, the motor and the large gear are mounted to the main housing such that the small gear engages with the large gear, the large gear is provided with a counterweight being fixed with a crankpin, the piston body is pivotally mounted to the crankpin, the motor drives the crankpin to swing in a circle, which allows the piston body to conduct reciprocating motion within the cylinder so as to force the compressed air in the inner space of the cylinder to flow into the air storage unit;
- wherein the improvement comprises:
- said main housing is formed integrally with the cylinder, and said cylinder defines at its top a second pressure chamber that communicates with the inner space thereof, and a valve plug is provided between the cylinder and the air storage unit for controlling the air communication between the first pressure chamber of the air storage unit and the second pressure chamber of the cylinder, wherein the cylinder has a top wall and an open bottom, a tubular projection being formed on the top wall of the cylinder, the bore of the tubular projection communicating with the inner space of the cylinder, the top of the tubular projection being provided with multiple tabs at regular gaps to define a central space there between, the inner surface of each tab being provided with multiple spaced ribs;
- further wherein the valve plug has a bottom round portion, a middle round portion, and a top round portion, the bottom portion having a diameter greater than the middle portion, the middle round portion having a diameter greater than the top portion, the valve plug being located in the central space surrounded by the tabs and snugly fitted between the ribs so as to prevent the valve plug from lateral movement under a force, the diameter of the bottom portion being smaller than the diameter of the central space surrounded by the tabs but greater than the diameter of the bore of the tubular projection;
- and further wherein at least one spring is disposed between the air storage unit and the valve plug, one end of the spring being fitted around the top round portion of the valve plug while urged against the middle round portion or fitted around the middle round portion of the valve plug while urged against the bottom round portion, whereby the compressed air in the inner space of the cylinder will be controlled at a predetermined pressure to enter the first pressure chamber of the air storage unit by way of the gaps between the tabs.
Dependencies are inferred from the claim text.