Pneumatic tool

Details Pneumatic tool Pneumatic tool

2007-05-08

2007-05-08

Lazo, Thomas E. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

C173S168000

Reexamination Certificate

active

11160543

ABSTRACT:
A pneumatic tool includes a shell defining first, second, third and fourth communicating spaces, a channel communicated with the second space, an inlet communicated with the channel, and an outlet communicated with the second space. A cylinder in the first space defines first, second and third ports. Pressurized air drives a rotor in the cylinder in a direction while entering the cylinder through the first port and leaving the cylinder through the third port and in an opposite direction while entering the cylinder through the second port and leaving the cylinder through the third port. A cover connected to the shell defines an aperture communicated with the second space, a first channel communicated with the third space on one hand and the first port on the other hand, a second channel communicated with the fourth space on one hand and the second port on the other hand. A rotational switch extends into the second space through the aperture and defines two cutouts. Different portions of the channel open to selective one of the cutouts as the rotational switch is rotated so that the rotor is driven at different speeds.

REFERENCES:
patent: 5377769 (1995-01-01), Hasuo et al.
patent: 5918686 (1999-07-01), Izumisawa
patent: 6044917 (2000-04-01), Brunhoelzl
patent: 6047780 (2000-04-01), Lin
patent: 6062323 (2000-05-01), Pusateri et al.
patent: 6561284 (2003-05-01), Taga
patent: 6634438 (2003-10-01), Pusateri et al.
patent: 6796386 (2004-09-01), Izumisawa et al.
patent: 6883619 (2005-04-01), Huang

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