Receptacles – Closures – Removable closure retained by friction
Patent
1997-02-27
1998-03-10
Cronin, Stephen
Receptacles
Closures
Removable closure retained by friction
220 421, 215230, 215317, B65D 4308
Patent
active
057251231
ABSTRACT:
The present invention concerns a system for closing cylindrical containers, such as Petri dishes, for example, with a cover cap whose cover apron presses against the outer surface of the lateral wall of the container. In particular, the present invention provides a cylindrical container and cover system having a simple and convenient, yet secure, closing and opening mechanism which consists of as few individual parts as possible. The cover cap of the present invention has individual elevations on the inner surface of the cover apron. The elevations press against the outer surface of the container walls to hold it in a non-positive manner. The elevations are made as knobs or elongated struts, and are arranged on opposite circular sections of the cover apron in such a way that at least two opposite sections of at least 130.degree. of the periphery of the cover apron have no elevations. In accord with the invention, a simple mechanism for removing the cover cap from the container is also provided. Gripping surfaces are provided on the cover apron at positions approximately 90.degree. to the elevations which permit the cover cap to be loosened from the container and lifted off with a simple and convenient maneuver.
REFERENCES:
patent: 885682 (1908-04-01), Zimmerman
patent: 1720835 (1929-07-01), Holmdahl
patent: 2677647 (1954-05-01), Lovell
patent: 3071275 (1963-01-01), Foss et al.
patent: 3995766 (1976-12-01), Fralick
patent: 4828130 (1989-05-01), Hofmann
patent: 5657895 (1997-08-01), Rogge
Cronin Stephen
Heraeus Instruments GmbH
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