Horizontally supported planar surfaces – Vertically adjustable
Patent
1984-05-07
1986-07-22
Lyddane, William E.
Horizontally supported planar surfaces
Vertically adjustable
248412, 108146, E04G 2508
Patent
active
046012460
ABSTRACT:
A support assembly (2) is provided for an overbed table (4). A lower pedestal column (6) is mounted on a base (8), and an upper pedestal column (12) is telescopically slideable within the lower column, and supports a table (4). A wedge and roller clutch (14) at the bottom of the upper column includes: wedges (16, 18) fixed to the upper column and extending downwardly from the lower end (20) thereof and having opposing camming surfaces (22, 24); a retainer (26) mounted to a release rod (28) and moveable up and down toward and away from the bottom end of the upper column; and rollers (32, 34) loosely received in the retainer and forced laterally horizontally outwardly against the inner walls (36, 38) of the lower column by the camming surfaces of the wedges to stop downward movement of the upper column and support the table. Downward movement of the release rod and the retainer permits lateral inward movement of the rollers out of forced cammed engagement with the inner walls of the lower column, to permit downward movement of the upper column and table. A counterbalancing return spring (90) biases the retainer upwardly to reduce the effort needed to lift the table and to bias each of the rollers to a proper camming position to be cammed by the camming surfaces of the wedges to a latched condition to support the table. Disclosed features include positive break disengagement means and silencing means. Other features include simplicity of design and efficiency and economy of manufacture, including part tolerances.
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Aschenbrenner Peter A.
Lyddane William E.
Thill, Inc.
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