Concrete well

Wells – Above ground apparatus – Well caps or casing heads

Patent

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Details

52 21, E21B 3303, E21B 4300

Patent

active

052996379

ABSTRACT:
A concrete well having an upper axial portion (10) decreasing in width axially from a larger bottom cross section to a smaller cross section at an upper opening of the well. The well includes an annular raiser (12) which is injection-molded of a plastic material and is located on the upper end surface (11) of the well surrounding said opening to extend the well axially upwards. The raiser has depressions (19) which extend in the peripheral direction of the raiser alternatingly on one side and the other of the raiser. The depressions are arranged in groups regularly spaced from each other by transverse solid portions (21) of the raiser. A well covering (13, 14) is supported on the raiser.

REFERENCES:
patent: 3250190 (1966-05-01), Taylor
patent: 3263579 (1966-08-01), Dorris
patent: 3926533 (1970-02-01), Binette
patent: 3938285 (1976-02-01), Gilbu
patent: 4187647 (1975-12-01), Hall
patent: 4255909 (1981-03-01), Soderstrom
patent: 4350177 (1982-09-01), Firchau et al.
patent: 4842060 (1989-06-01), Paulus
patent: 4957389 (1990-09-01), Neathery

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