Counterbalancing apparatus

Details Counterbalancing apparatus Counterbalancing apparatus

1977-08-04

1979-01-23

Moses, Richard L.

Photocopying

Including fiber optics

355 75, G03G 1500

Patent

active

041358058

ABSTRACT:
Apparatus for counterbalancing the movement of a platen cover or document handler between a first closed position and a second open position. The counterbalancing apparatus comprises a gas spring and a tension spring. The tension spring is arranged to increasingly counter the force exerted by the gas spring as the platen cover is moved from the first to the second position. This compensates for the reduced force exerted by the platen cover as it is opened. The platen cover in the second position preferably has moved past vertical and the tension spring is effective to counter the force exerted by the cover between vertical and the second position.

REFERENCES:
patent: 2545964 (1951-03-01), Maxwell
patent: 3198069 (1965-08-01), Florsheim
patent: 3615134 (1971-10-01), Newcomb
patent: 3994582 (1976-11-01), Goshima et al.

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