Counterbalance mechanism for vertically movable means

Details Counterbalance mechanism for vertically movable means Counterbalance mechanism for vertically movable means

1986-10-14

1989-02-28

Chambers, A. Michael

Motors: expansible chamber type

With motive fluid valve

Expanding chamber inlet controlled by contracting chamber...

91361, 91364, F15B 3116

Patent

active

048075183

ABSTRACT:
A spindle carrier, which is movable vertically by an electric servo motor through a relatively long ball screw, has a substantially constant counterbalance force maintained on it irrespective of whether it is moving up or down. This prevents compression or tension of the ball screw. The counterbalance force is maintained substantially constant through sensing the load on the spindle carrier and using the sensed load to vary the hydraulic pressure applied to a piston within a hydraulic cylinder and connected through a chain to the spindle carrier to apply the counterbalance force.

REFERENCES:
patent: 3398650 (1968-08-01), Garnjost
patent: 4202247 (1980-05-01), Hunkar et al.
patent: 4202250 (1980-05-01), Zeuner et al.

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