Cabinet door interlock

Details Cabinet door interlock Cabinet door interlock

1983-03-16

1985-03-19

Schmidt, Frederick R.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51436, 51438, 51426, B24C 700, B24C 304

Patent

active

045050775

ABSTRACT:
A blast cabinet having at least one cabinet door opening into the blast chamber includes a pneumatic interlock between the door and a valve through which air is supplied under pressure to a gun within the chamber. The valve is actuated to an open position by air under pressure admitted under the control of an operator. Incorporated in the tubing system through which the air under pressure is directed to the valve is a header which is left in communication with ambient air whenever the door is open, to depressurize the supply of air to the valve and thus prevent it from opening under these conditions. Whenever the door to the blast chamber is closed, the door seals off from ambient the line through which pressurized air is supplied for operating the main valve through which abrasive-media-laden air is supplied to the blast gun, so that the gun can be operated only when the blast chamber door is fully closed, thus assuring against the danger of abrasive particles being discharged from the blast chamber into nearby work areas.

REFERENCES:
patent: 2008741 (1935-07-01), Allan
patent: 2321774 (1943-06-01), Ruemelin
patent: 3866357 (1975-02-01), Callahan et al.
patent: 4300318 (1981-11-01), Brown
patent: 4360990 (1982-11-01), Hubbard

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