Pneumatic motor-controlled valve of screwdriver

Details Pneumatic motor-controlled valve of screwdriver Pneumatic motor-controlled valve of screwdriver

2005-09-13

2005-09-13

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to condition of advance causing or...

C173S013000, C173S093500, C081S057440, C081S434000, C227S136000

Reexamination Certificate

active

06942042

ABSTRACT:
A pneumatic motor-controlled valve of a screwdriver is installed between an air guide hole of a pneumatic motor and a main air valve gate in the screwdriver. A valve hole is formed on a guide seat and is communicated to an air guide hole of the motor. A plug is formed on an outer wall of a cylinder; and the cylinder is movably mounted within the guide seat. A lower spring resists against the cylinder. At least one ventilating hole is formed on a wall of the cylinder for communicating the valve hole to one of the upper valve opening and the lower valve opening of the main air valve gate. The plug drives the cylinder to actuate with the descending and rising of the piston valve so as to open or close the valve hole of the guide seat, thereby, the rotation of the motor is controlled.

REFERENCES:
patent: 2818893 (1958-01-01), Shaff
patent: 5730035 (1998-03-01), Ohmori et al.
patent: 5862724 (1999-01-01), Arata et al.
patent: 6026713 (2000-02-01), Ohmori et al.
patent: 6061901 (2000-05-01), Tanaka
patent: 6247387 (2001-06-01), Ketteringham
patent: 6672404 (2004-01-01), Kamo et al.

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