Movable or removable closures – Mounted for multidirectional or oblique movement – Swings on plural axes; e.g. – pivotal link arms
Patent
1984-06-11
1986-06-10
Kannan, Philip C.
Movable or removable closures
Mounted for multidirectional or oblique movement
Swings on plural axes; e.g., pivotal link arms
49395, 49401, 49504, 52475, E05D 1540
Patent
active
045934932
ABSTRACT:
An access door to be installed on the ceiling or the like of a building which essentially comprises an outer square frame adapted to be installed in an opening formed at said installation area; an inner square frame pivotally connected to said outer frame for movement between open and closed positions; a pair of link hinge means provided on each of two selected sides of said outer frame to pivotally connect said frame to said outer frame; and a lock means for locking said inner frame to said outer frame as the inner frame is in its closed position.
The inner frame has a joint finishing flange at the peripheral edge thereof to conceal the peripheral edge of said outer frame as the inner frame is in its closed position. Also, each of the link hinge means essentially comprises a pair of parallel long links in which the leading end of the lower link has a swing control arm, a short follower link for pivotally connecting the leading ends of the long links, a link guide upwardly pushing the swing control arm as the inner frame is closed, and a bracket connecting the long links together and securing the link hinge means to the outer frame.
REFERENCES:
patent: 3274735 (1966-09-01), Stackhouse
patent: 3375627 (1968-04-01), Bursiek et al.
patent: 3686795 (1972-08-01), La Barge
patent: 4098024 (1978-07-01), Naka
patent: 4237663 (1980-12-01), Storer
patent: 4443973 (1984-04-01), Naka
Naka Hiromitsu
Okushima Takehiko
Shoji Tatsuo
Kabushiki Kaisha Naka Gijutsu Kenkyusho
Kannan Philip C.
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