Dual action air pump

USPTO Application #: 20080050254
Title: Dual action air pump

Abstract: A dual action air pump has a body and a piston assembly. The body has an air chamber, an air channel and an elongated hole, which are defined longitudinally in the body parallel to each other. The air chamber has two ends, one of the ends has an outlet with an outlet check valve disk and a secondary inlet with a secondary inlet check valve disk formed therein, the other end has an inlet with an inlet check valve disk formed therein. The air channel has two ends, one of the ends communicates with one end of the air chamber, and the other end has a secondary outlet with a secondary outlet check valve disk formed therewith. The piston assembly is slidably abutting airtightly an inner surface of the air chamber, and can be pull or push to draw air and discharge air simultaneously. Moreover, an air hose used with the dual action air pump can be put into the elongated hole to have a pleasing appearance. (end of abstract)

Agent: Cooper & Dunham, LLP - New York, NY, US
Inventor: Chun-Chung Tsai
USPTO Applicaton #: 20080050254 - Class: 417534 (USPTO)

Dual action air pump description/claims

The Patent Description & Claims data below is from USPTO Patent Application 20080050254, Dual action air pump.

Brief Patent Description - Full Patent Description - Patent Application Claims

BACKGROUND OF THE INVENTION

[0001]1. Field of the Invention

[0002]The present invention relates to an inflater, and more particularly to a dual action air pump that simultaneously draws and discharges air into and from the air pump and is convenient to use.

[0003]2. Description of Related Art

[0004]Air pumps fill pneumatic articles such as basketballs and tires with air. With reference to FIG. 8, typically, a conventional air pump in accordance with the prior art has a body (40), a piston assembly (50) and an air hose (60). The body (40) has a chamber (41), an outlet (42) and an inlet (43) defined therein. The chamber (41) has an inner surface. The piston assembly (50) is mounted slidably through the inlet (43) and has a piston rod and a piston. The piston rod is mounted slidably through the inlet (43) and has an outer end, a handle (52) and an inner end. The outer end protrudes from the inlet (43). The handle (52) is attached securely to the outer end to reciprocate the piston assembly (50) easily inside the chamber. The inner end is inside the chamber (41). The piston is attached to the inner end of the piston rod, slidably abuts and forms a seal with the inner surface of the chamber (41) and has a check valve (51). The check valve (51) is mounted through the piston. When the piston assembly (50) is pulled, the check valve (51) allows air in the chamber (41) to move below the piston. The air hose (60) is normally stored on the body (40) and has a proximal end (61), a distal end (62) and a nozzle. However, storing the air hose (60) on the body (62) causes the conventional air pump to have an unsightly appearance. The proximal end (61) connects to the outlet (42) of the chamber (41). The nozzle connects to distal end (62) of the air hose (60) and to an inlet of an inflatable object so air can be pumped into the object. When the piston assembly (50) is pushed, air in the chamber (41) below the piston is forced through the outlet (42) and the air hose (60) into an inflatable object.

[0005]Since air is discharged from the outlet (42) only when the piston assembly (50) is pushed, a person has to spend more time to inflate an inflatable article.

[0006]To overcome the shortcomings, the present invention provides a dual action air pump to obviate or mitigate the aforementioned problems.

SUMMARY OF THE INVENTION

[0007]The main objective of the present invention is to provide a dual action air pump that draws air into and discharges air from the air pump at the same time.

[0008]Another objective of the present invention is to be able to store an air hose used with the dual action air pump inside the dual action air pump to give the dual action air pump a pleasing appearance.

[0009]Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]FIG. 1 is a perspective view of a dual action air pump in accordance with the present invention;

[0011]FIG. 2 is an exploded perspective view of the dual action air pump in FIG. 1;

[0012]FIG. 3 is a side view in partial section of the dual action air pump in FIG. 1;

[0013]FIG. 4 is a side view in partial section of the dual action air pump in FIG. 3 rotated slightly to the right;

[0014]FIG. 5 is a cross sectional bottom view of the dual action air pump along line 5-5 in FIG. 3;

[0015]FIG. 6 is an operational side view in partial section of the dual action air pump in FIG. 1 during a downstroke;

[0016]FIG. 7 is an operational side view in partial section of the dual action air pump in FIG. 1 during an upstroke; and

[0017]FIG. 8 is a side view in partial section of a conventional air pump in accordance with the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0018]With reference to FIGS. 1 to 4, a dual action air pump in accordance with the present invention comprises a body (10), an optional air hose (30) and a piston assembly (20).

[0019]The body (10) is elongated and has a rear end, a front end, an air chamber (11), an air channel (12), an optional elongated hole (13), a multi-valve body (14), a front end cap (18) and a rear end cap (19). The air chamber (11) is defined longitudinally in the body (10) and has an inner surface, a rear end and a front end. The air channel (12) is defined longitudinally in the body (10) parallel to the air chamber (11) and has a first end and a second end. The first end is formed in the rear end of the body (10) and communicates with the rear end of the air chamber (11).

[0020]The elongated hole (13) is formed longitudinally in the body (10) parallel to the air chamber (11) and the air channel (12) and has an open outer end is formed in the rear end of the body (10).

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