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US 8,147,224 B2Granted
Air pump with a one-piece cylinder
AssigneeDongguan Tiger Point, Metal & Plastic Products Co., Ltd.
InventorChun-Chung Tsai
Life of this patent
Estimating the term…
Abstract
An air pump has a one-piece cylinder and a piston assembly. The one-piece cylinder has a body, a cap, a pedal and a base formed together by injection molding and welding process. The piston assembly is mounted in the one-piece cylinder and has a rod, a handle and a piston. The one-piece cylinder is structurally firm and provides excellent hermetic characteristics.
Claims3
An air pump, comprising:
- a one-piece cylinder having
- a body having a top end, an open bottom end and a chamber defined in the body and having an inner sidewall;
- a cap formed on the top end and having a through hole defined through the cap;
- a pedal formed on the bottom end;
- and
- a base formed on and closing the open bottom end;
- and
- a piston assembly mounted slidably in the chamber and having
- a rod extending through the through hole in the chamber;
- a handle mounted on the rod out of the cylinder;
- and
- a piston mounted on the rod and hermetically contacting the inner sidewall of the chamber;
- wherein:
- the rod has
- an outer tube mounted through the through hole of the cap, extending slidably in the chamber of the cylinder and having a top end, a bottom end and a central hole defined through the outer tube and having a diameter;
- and
- an inner tube mounted in the central hole of the outer tube, having a top end and a bottom end and further having
- an outer diameter being smaller than the diameter of the central hole;
- and
- an outlet channel defined through the inner tube;
- the handle has
- an inlet hose defined on the handle and communicating with the central hole of the outer tube;
- and
- an outlet hose defined on the handle and communicating with the outlet channel of the inner tube;
- and
- the piston divides the chamber into an upper sub chamber and a lower sub chamber, has a top, a bottom and an outer edge and further has
- an annular groove defined in the outer edge;
- a radial passage defined radially in the outer edge and selectively communicating with the upper or lower sub chamber;
- an outlet cavity defined in the piston and communicating with the radial passage and the outlet channel of the inner tube;
- an inlet cavity defined in the piston and communicating with the central hole of the outer tube;
- multiple downstroke holes defined through the bottom of the piston and communicating with the inlet cavity and the upper sub chamber;
- multiple upstroke holes defined through the bottom of the piston and communicating with the inlet cavity and the lower sub chamber;
- an O-ring mounted in the annular groove, hermetically contacting the inner sidewall of the chamber and selectively abutting the top or bottom of the piston;
- a downstroke valve resiliently mounted on the top of the piston and selectively opening the downstroke holes;
- and
- an upstroke valve resiliently mounted on the bottom of the piston and selectively opening the upstroke holes.
33 more elements
Dependencies are inferred from the claim text.