Structure of hand pump

Details Structure of hand pump Structure of hand pump

1998-12-03

2000-09-19

Ryznic, John E.

Expansible chamber devices

Knockdown or flow conduit storage or retrieval means

92129, 92165R, F01B 3100

Patent

active

061195812

ABSTRACT:
A hand pump includes a cylindrical casing having a top open side covered with a top cover and a bottom side provided with an air outlet, a handle inserted through a hole the top cover, and a piston moved with the handle up and down to pump air out of the cylindrical casing through the air outlet, wherein the handle has multiple peripheral sides and angles defining a plurality of longitudinal grooves equiangularly spaced around the periphery for guiding outside air into the cylindrical casing evenly upon an up stroke of the handle, and a wedge-like coupling rod at a bottom end thereof press-fitted into a coupling hole at the piston for enabling the piston to be reciprocated with the handle.

REFERENCES:
patent: 4106392 (1978-08-01), Johnson, Jr. et al.
patent: 4984742 (1991-01-01), Ellison et al.
patent: 5005440 (1991-04-01), Ballu
patent: 5433136 (1995-07-01), Lung-Po
patent: 5505338 (1996-04-01), Gueret
patent: 5531575 (1996-07-01), Lin

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