Latch for utility access door

Details Latch for utility access door Latch for utility access door

1985-09-12

1986-12-09

Wolfe, Robert L.

Locks

Special application

For closures

292204, 70465, E05B 6506

Patent

active

046272496

ABSTRACT:
A latch has spaced inner and outer plates formed with respective coaxial bores. The outer plate is formed at its bore with at least one notch and the inner plate is formed adjacent its bore with at least two angularly offset and axially extending cutouts. A plug extending through the bores and rotatable therein about the axis has an outer head in the outer bore and accessible from outside the plates and an opposite inner end exposed inward past the inner plate. A locking dog extends radially from the plug in the space between the plates. An inner abutment washer is secured to the inner end of the plug and spaced axially inward of the inner plate and a retaining washer angularly nondisplaceable on the inner end of the plug has a bump engageable in the cutouts of the inner plate. A compression spring braced between the washers urges the bump into the cutouts. A key engageable with the plug head has a radial tab complementary with the notch of the outer plate. The plug with the pawl and retaining washer are angularly displaceable about the axis between a locking position in which the tab and notch can interfit and the bump of the retaining washer engages one of the cutouts of the inner plate and a freeing position in which the tab and notch cannot interfit and the bump of the retaining washer engages the other cutout of the inner plate. A formation on the inner end of the plug is shaped to be engaged for rotation of the plug from inside the inner plate.

REFERENCES:
patent: 1163838 (1915-12-01), Maul
patent: 1263104 (1918-04-01), Phelps
patent: 1604330 (1926-10-01), Witkowski
patent: 1878436 (1932-09-01), Burroughs
patent: 4270780 (1981-06-01), Bernard

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