Low pressure shut off device contained within a pneumatic tool

Details Low pressure shut off device contained within a pneumatic tool Low pressure shut off device contained within a pneumatic tool

1987-08-17

1989-03-21

Yost, Frank T.

Tool driving or impacting

Automatic control of power operated means

137456, 13762427, 81470, B25B 23151

Patent

active

048134929

ABSTRACT:
The invention provides a low pressure shut off device contained within a pneumatic tool that senses the air pressure of an air stream supplied to a pneumatic motor and shuts off the air flow when the pressure falls below a predetermined level set to maintain consistent performance of the tool and to avoid damage to the tool or to the workpiece. The invention includes a throttle valve, a throttle piston that moves to open and close the valve, and a device for sensing the air pressure of the supply stream, holding the throttle valve open when the pressure is sufficient and closing it when the supply pressure is insufficient. The invention may also be used in combination with an air control system within a pneumatic tool such that the sensing device shuts off the flow of air to the air control system as well as the motor when the air control system pressure is insufficient.

REFERENCES:
patent: 3650297 (1972-03-01), Hubbard
patent: 3970151 (1976-07-01), Workman, Jr.

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