Dual stage, dual mode air pump

Details Dual stage, dual mode air pump Dual stage, dual mode air pump

1998-09-10

1999-12-07

Freay, Charles G.

Pumps

Successive stages

Reciprocating rigid stages

417440, 417528, 417530, 417534, 4175551, F04B 300

Patent

active

059972564

ABSTRACT:
The dual stage, dual mode air pump is selectively operable in a low pressure, high volume mode or a high pressure, low volume mode. It includes a pump head, an outer tube that is engaged to the pump head, an inner tube that is engaged to the pump head and a middle tube that is slidably engaged to both the outer tube and the inner tube. A mode pump switch is utilized to allow the pump operator to change the mode of the pump. In the preferred embodiment, the mode switch is disposed within the pump head. It includes an air passageway having a manually switchable valve disposed therein. In the high volume, low pressure mode the valve switch is closed, whereupon pumped air passes into a pneumatic article engaged to the end of the pump. When the valve switch is opened, the pump is operable in the low volume high pressure mode, and a portion of the pumped air is outletted into the ambient environment, rather than being pumped into the pneumatic article. Additionally, the pump includes multiple chambers, such that a pump chamber is prepressurized on a pump backstroke to increase the air throughput of the pump.

REFERENCES:
patent: 5435703 (1995-07-01), Lin
patent: 5676529 (1997-10-01), Hermansen et al.
patent: 5759018 (1998-06-01), Thanscheidt

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