Receptacles – Outlet or junction box type – Sectional receptacle
Patent
1985-09-20
1987-02-17
Hall, George T.
Receptacles
Outlet or junction box type
Sectional receptacle
220 74, 220 5R, B65D 742, B65D 702
Patent
active
046433236
ABSTRACT:
The bunghole-equipped barrel of a thermoplastic synthetic resin with rolled rings arranged in the zone of the upper head (2) and the lower head coaxially to the barrel sidewall (1) is characterized in that the upper rolled ring (7) is molded in a bead shape directly from the barrel sidewall (1) and the upper head (2), and the lower rolled ring is molded in a bead shape directly from the barrel sidewall and the lower head, with the formation of respectively one annular cavity (9); and that an open gap (14) is formed between the upper marginal zone (10) of the barrel sidewall (1) and the outer marginal zone (11) of the upper head (2), as well as between the lower marginal zone of the barrel sidewall and the outer marginal zone of the lower head. For the formation of predetermined breaking points in case of external and/or internal overstressing, the upper marginal zone (10) of the barrel sidewall (1) is welded together spotwise over the barrel circumference with the outer marginal zone (11) of the upper head (2). In the same way, predetermined breaking points are formed at the lower rolled ring.
REFERENCES:
patent: 4228122 (1980-10-01), Hammes
patent: 4257527 (1981-03-01), Snyder et al.
patent: 4378328 (1983-03-01), Przytulla et al.
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