Rotational speed adjustment mechanism of a pneumatic tool

Details Rotational speed adjustment mechanism of a pneumatic tool Rotational speed adjustment mechanism of a pneumatic tool

2005-01-18

2005-01-18

Hirsch, Paul J. (Department: 3754)

Valves and valve actuation

With selective flow regulation

Different sized bores in valve head

C251S311000

Reexamination Certificate

active

06843466

ABSTRACT:
A rotational speed adjustment mechanism of a pneumatic tool, including an intake member, a speed adjustment valve and a case enclosing the intake member and the speed adjustment valve. The intake member is formed with an intake and an exhaust port which are not communicated with each other. A lateral outlet and a lateral inlet are formed on the sidewall of the body section for communicating the intake with the exhaust port. The speed adjustment valve has a collar coaxially fitted on the body section and rotatable between a full speed position and a slowest speed position. A full speed through hole and at least one slow speed through hole are formed on the sidewall of the collar. When the collar is positioned in the full speed position, the full speed through hole is coaxially communicated with the lateral outlet, whereby the full diameter range of the lateral outlet provides a passage for the airflow. When the collar is positioned in the slowest speed position, the slow speed through hole is communicated with the lateral outlet, whereby simply the diameter range of the slow speed through hole provides a passage for the airflow.

REFERENCES:
patent: 3783890 (1974-01-01), Wurzburger
patent: 4406442 (1983-09-01), Bettin et al.
patent: 4562994 (1986-01-01), MacDonald
patent: 4582084 (1986-04-01), Gyurovits
patent: 4632362 (1986-12-01), Lucking
patent: 5971604 (1999-10-01), Linga et al.

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