Title: Device for automatic door closing

Abstract: A device for automatic closing of a door includes a plate spring of predetermined length, having an arcuate cross-section and a center section. The spring is bent about the center section at an angle deviating slightly from a straight line. The door may be opened and closed about a hinge, and the spring ends are attached to a wall and the door, respectively.

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Inventors: Kanou, Kazuyoshi

Application Number: 760434
Filing Date: 1977-01-18
Publication_date: 1978-01-31
Assignee:
Primary Class(es): 16/72 16/73, 16/85
Other Classes:
US Patent Ref:

1319554	Oct, 1919	Anderson	16/73.
2011694	Aug, 1935	Stevens	16/73.
2730774	Jan, 1956	Sagstven	16/72.
3137889	Jun, 1964	Sogian	16/73.
3329991	Jul, 1967	Gobble	16/72.
3385344	May, 1968	Andrews	16/73.
3785006	Jan, 1974	Metz	16/73.

Other Refs: 521,705

May, 1940	UK

Primary Examiner: Feldbaum, Ronald
Assistant Examiner:
Attorney: Haseltine, Lake & Waters