Valves and valve actuation – Valve actuator extending through fluid inlet or outlet
Patent
1995-11-22
1998-08-04
Chambers, A. Michael
Valves and valve actuation
Valve actuator extending through fluid inlet or outlet
251228, 251239, 251263, F16K 3100
Patent
active
057882193
ABSTRACT:
A throttle valve is disposed in a handle of an air tool. The throttle valve includes a throttle trigger provided on the handle of the air tool, and a throttle pin which is fixed to the throttle trigger and adapted to axially move when the throttle trigger is operated. A valve stem having a head portion is coupled with the throttle pin. A valve bush is press-fit into a shoulder portion provided inside the handle on which the head portion of the valve stem rests. A spring is provided to urge the head portion of the valve stem to contact the valve bush and to allow the valve stem to tilt when the throttle pin axially moves. This structure makes it possible to provide airtightness between the shoulder portion and the head portion of the valve stem by a simplified machining. In addition, the airtightness can be maintained for a longer period of time compared to the case of using a washer made of Teflon.
REFERENCES:
patent: 2362608 (1944-11-01), Allen
patent: 2553991 (1951-05-01), Wagner et al.
patent: 5205540 (1993-04-01), Clapp
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