Pumps – With signal – indicator – or inspection means
Reexamination Certificate
2000-05-24
2001-11-20
Freay, Charles G. (Department: 3746)
Pumps
With signal, indicator, or inspection means
C417S527000, C417S528000
Reexamination Certificate
active
06318969
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to an air pump, and more particularly to a floor air pump.
BACKGROUND OF THE INVENTION
The conventional air pump is provided with two cylinders of different sizes to speed up the inflating effect, and a switch which must be manually operated in the course of the operation of the air pump.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a floor air pump capable of automatic switching of the cylinders.
The floor air pump of the present invention comprises an outer tube, a pressure leaking device, a pressure gauge, and an air discharge tube. The outer tube is provided with two cylinders different in size from each other. The pressure leaking device is disposed in the lower end of the outer tube and is provided in the interior thereof with a receiving compartment in communication with the large cylinder. The receiving compartment is provided with a pressure leaking slide block, and at least two leakproof rings to keep the inner wall of the receiving compartment in the airtight state. The pressure leaking slide block is provided with an annular groove capable of forming a channel along with the movable pressure leaking slide block. The receiving compartment is provided therein with a spring to facilitate the position recovery of the pressure leaking slide block. The pressure gauge is disposed in the outer side of the outer tube such that the pressure gauge is in communication with the interior of the outer tube. The air discharge tube is disposed in one side of the pressure gauge for discharging the air so as to inflate an inflatable object.
REFERENCES:
patent: 1484549 (1924-02-01), Burnam
patent: 1491388 (1924-04-01), Foster
patent: 5997256 (1999-12-01), Gunther
patent: 6027319 (2000-02-01), Winefordner et al.
patent: 6065947 (2000-05-01), Wu
patent: 6196807 (2001-03-01), Wu
patent: 6227810 (2001-05-01), Huang et al.
Browdy and Neimark
Freay Charles G.
Torrente David J.
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