Geometrical instruments
Patent
1984-01-24
1985-11-05
McQuade, John
Geometrical instruments
339 87, 339 89R, H01R 13639
Patent
active
045509662
ABSTRACT:
The invention is directed to improvements in electrical cable connectors for safe use with electric motor driven mine equipment in coal mines in which gassy conditions normally create great danger of explosion caused by incendive arcing or sparking. In accordance with the invention the receptacle and plug components of the connector, after being screwed together are locked in operative position by the provision of a padlock the stem of which passed through a hole in a locking ear of a mounting flange on the receptacle component, is engaged as one of a series of undulations in the surface of a compression lock ring on the plug component facing the locking ear. Unlike all prior constructions in which the mounting flange is permanently integral with the receptacle component, the mounting flange according to this invention is temporarily but securely fixed in place during operations but is removable if the locking ear becomes broken (a not uncommon occurrence) and may be simply replaced without replacing the whole expensive receptacle component.
REFERENCES:
patent: 3311865 (1967-03-01), Devito
patent: 3755772 (1973-08-01), Reed
patent: 4033662 (1977-07-01), Swiger
J & R Manufacturing, Inc.
McQuade John
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