Movable or removable closures – Removable closure – Releasable means on closure
Patent
1977-10-25
1979-03-06
Downey, Kenneth
Movable or removable closures
Removable closure
Releasable means on closure
E05C 2102
Patent
active
041423291
ABSTRACT:
A catch basin grate and receiving frame locking assembly is installed on a catch basin grate and interfitted with a receiving frame, in turn imbedded in a pavement, thereby preventing the removal of the catch basin grate only by a designated workman having a special pivotal lever tool. On one side of the catch basin grate a depending structure is either made integrally with the grate or bolted to it, and it supports a horizontal projecting portion which interfits with the receiving frame. On the opposite side of the catch basin grate, two depending structures are either made integrally with the grate or bolted to it and they support a horizontal movable locking member. It has a compression coiled spring subassembly, which keeps the horizontal movable locking member engaged with the receiving frame, until a removable pivotal lever is used to move the horizontal movable locking member against the force of the coiled spring and clear of the receiving frame, thereby permitting the catch basin grate to be intentionally removed.
REFERENCES:
patent: 1542900 (1925-06-01), Maddocks
patent: 1693190 (1928-11-01), Benedetti
patent: 2009132 (1935-07-01), Gehris
Downey Kenneth
Mattern Jr. Roy E.
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