Horizontally supported planar surfaces – Vertically adjustable – Shelf type
Patent
1993-06-03
1995-03-28
Milano, Michael J.
Horizontally supported planar surfaces
Vertically adjustable
Shelf type
74 8922, 474154, A47B 900
Patent
active
054007216
ABSTRACT:
An improved load compensator for a spring counter-weighting mechanism including a snail cam to provide a constant counter-weight force is described. The cam provides a constant torque to a drum on which are wound cables for exerting a constant counter-weighting force. A manually operable device for altering the relative radial positions of the cam and drum varies the amount of the constant counter-weighting force. The cam is rotated with respect to the drum by a spur gear fitting within a ring gear fixed to the drum and rotated by a knob connected to an axle carrying a pinion gear engaging the spur gear. The spiral surface can be effectively reconfigured with respect to a portion of the cable fitting therearound.
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patent: 4760622 (1988-08-01), Rohrman
patent: 4863420 (1989-09-01), Ivy
de Angeli Michael M.
Milano Michael J.
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