Horizontally supported planar surfaces – Vertically adjustable
Patent
1975-06-20
1976-12-28
Frazier, Roy D.
Horizontally supported planar surfaces
Vertically adjustable
108146, 248411, A47B 900
Patent
active
039994929
ABSTRACT:
A bedside table for use over a bed or like object. The table has a base and a vertical guide thereon. A table top having a support thereon is adapted to cooperate with the vertical guide on the base to maintain the table top horizontal as its vertical position is varied over a range. A constant force spring is connected between the base and the table top to apply a constant force tending to raise the table top over the range. Releasable locking means are provided to lock the table top at any vertical position within the range. The locking device includes a vertical surface and a pivotally mounted cam secured to move into and out of engagement with the vertical surface. A spring is provided for continuously urging the cam toward engagement with the vertical surface. The spacing between the pivot axis for the cam and the vertical surface is less than the length of the cam between the pivot axis and the free end of the cam. The cam is to become tightly wedged between the pivot axis and the vertical surface upon a downward force being applied to the table top to lock the table top in a desired vertical position in its range of movement. This camming action also causes the looseness between the table top and the vertical guide to become tightened. A release device is provided for moving the cam downwardly away from the vertical surface and out of engagement with the vertical surface against the urging of the spring to facilitate a vertical adjustment of the table top.
REFERENCES:
patent: 389577 (1888-09-01), Kintz
patent: 2609033 (1952-09-01), Finke
patent: 2787485 (1957-04-01), Frisell
patent: 3188986 (1965-06-01), La Vigne
patent: 3310008 (1967-03-01), Aleksa et al.
patent: 3380405 (1968-04-01), Barecki et al.
patent: 3715997 (1973-02-01), Barth
patent: 3854428 (1974-12-01), Fullenkamp
Aschenbrenner Peter A.
Emrick, Inc.
Frazier Roy D.
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