Counterbalance mechanism

Details Counterbalance mechanism Counterbalance mechanism

1989-02-06

1990-09-04

Seidel, Richard K.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Carpet fasteners

Combined fasteners and stretchers

16201, 312312, 248572, E05D 1300, F16M 1100

Patent

active

049532561

ABSTRACT:
A counterbalance mechanism for negating the force of gravity when moving a display cabinet shelf up or down. The mechanism has a torsion spring counterbalance on a shaft extending the width of the shelf and gears at each end of the shaft which engage travelling rack gears attached beneath each end of the shelf. The shelf includes integral guide rails rolling on four bearings attached to the stationary frame of the cabinet. The use of spiral gears compensates for the spring torque variation and provides constant tangential gear force on the shelf regardless of the vertical position of the shelf. Having gears at each side of the moving shelf joined by a common shaft minimizes side-to-side tilting.

REFERENCES:
patent: 337536 (1886-03-01), Thomas
patent: 466941 (1892-01-01), Goldy
patent: 577720 (1897-02-01), Cobb
patent: 3575368 (1971-04-01), Thomas et al.
patent: 4571775 (1986-02-01), Leonard
patent: 4621391 (1986-11-01), Leonard
patent: 4670940 (1987-06-01), Leonard
"Counterbalance Torque is Adjustable, Compact", Excellence in Design, Health/Zenith Computer Winner, Design News, Frank Yeaple, Nov. 4, 1985, pp. 94-96.
"Program Designs Spring Counterbalance", Tech Briefs, Machine Design, Jamil Ahmad, Jun. 25, 1987, p. 110.

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