Access door with safety latch for pressurized air chambers

Details Access door with safety latch for pressurized air chambers Access door with safety latch for pressurized air chambers

1991-07-25

1993-03-30

Cuomo, Peter M.

Movable or removable closures

With means mounting closure for swinging

With latch or lock

292241, E05B 6506

Patent

active

051972263

ABSTRACT:
An access door assembly for a pressurized windbox, comprising a door frame having an opening with a post extending from the door frame. A door is pivotally mounted to the frame at a hinge. A latch is pivotally mounted to the door and includes a hook which engages the post for locking the door to the frame. The latch also includes a catch member extending beyond the hook for catching the post when the latch is moved to unlock the door. This stops the door in an intermediate partly open position allowing gusts of air to blow through the opening thereby giving the operator a warning and indication that the windbox is in fact under pressure. In this manner, an operator has sufficient time to step out of the way before moving the latch further, thereby fully disengaging the latch from the post and allowing the door to open fully.

REFERENCES:
patent: 1466528 (1923-08-01), Holmes
patent: 2545886 (1951-03-01), Kooistra
patent: 2775216 (1956-12-01), Alexeff et al.
patent: 2920585 (1960-01-01), Grossman et al.
patent: 3039837 (1962-06-01), Poe
patent: 3055321 (1962-09-01), Fitz Patrick
patent: 3217661 (1965-11-01), Kemp
patent: 3479994 (1969-11-01), Kreider et al.
patent: 3560038 (1971-02-01), Gunther
patent: 3781162 (1973-12-01), Rudd et al.
patent: 3893722 (1975-07-01), Galbreath et al.
patent: 3966244 (1976-06-01), Kleisser et al.
patent: 4674777 (1987-06-01), Guelck

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