Geometrical instruments
Patent
1977-09-19
1978-12-19
Goldberg, Howard N.
Geometrical instruments
85 85, 220 32, H02G 316
Patent
active
041303350
ABSTRACT:
An electrical wiring box having a pair of factory-installed mounting elements associated therewith for permitting the quick and easy mounting of an electrical device within the wiring box. The wiring box includes bosses each having a generally-rectangular opening countersunk therein for receiving a corresponding mounting element. Each of the mounting elements includes a central portion having a screw-receiving opening and a pair of abutment edge portions adjacent to the opening, a pair of spaced-apart side portions integral with the central portion, and a pair of deflectible thread-engaging portions integral with the side portions and including pairs of retention wing portions at the terminations thereof. When inserted into their associated openings, the edge portions of the central portions of the mounting elements abut against shoulders adjacent to the openings, thereby limiting the forward entry of the mounting elements into the openings, and the retention wing portions are positioned externally at the back ends of the openings in a manner so as to prevent removal of the mounting elements from the openings.
An electrical device is mounted within the wiring box in a field installation by simply inserting associated screws into the screw-receiving openings of the central portions of the mounting elements and pushing the screws into the regions between the thread engaging portions of the mounting elements. As a result, the thread-engaging portions are caused to be deflected outwardly and, after the screws have been driven completely home, the thread-engaging portions come to rest in different regions between threads of the screws, thereby firmly gripping onto the screws. The outward deflection of the thread-engaging portions by the screws further causes the mounting elements to be more completely fixed within their associated openings.
REFERENCES:
patent: 2720135 (1955-10-01), Gisondi
patent: 3895732 (1975-07-01), Robinson
E. F.
Goldberg Howard N.
Union Insulating Company
Xiarhos Peter
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