Robot with balancing mechanism having a variable counterbalance

Details Robot with balancing mechanism having a variable counterbalance Robot with balancing mechanism having a variable counterbalance

1985-01-22

1987-04-21

Spar, Robert J.

Material or article handling

Vertically swinging load support

Shovel or fork type

16289, 2482921, 901 48, B66C 2372

Patent

active

046592806

ABSTRACT:
A robot including a balancing mechanism with a spring assembly which exerts a variable force to compensate for the gravitational moment transferred to the mechanism during relative rotation between an arm assembly of the robot and the rest of the robot about a pivotal axis. A spring of the spring assembly is chosen to have a force-deflection characteristic to account for the gravitational moment and the geometry of the mechanism. The arm assembly has a pivotal connection that pivotally supports the arm assembly on the rest of the robot for movement about the pivotal axis. The spring assembly has a longitudinal axis which extends towards and is substantially perpendicular to the pivotal axis. The moment arm is connected to the arm assembly at an attachment point offset from the pivotal axis. A first sprocket wheel is mounted on a drive gear of the arm assembly to rotate therewith and a second sprocket wheel is pivotally mounted at the free end of the spring assembly. A chain is wound about the first sprocket wheel to alternately wind and unwind during relative rotation about the pivotal axis. The opposite end of the chain is mounted to the gear to rotate therewith and an intermediate portion of the chain is trained over the second sprocket wheel.

REFERENCES:
patent: 2726914 (1955-12-01), Allen
patent: 2940459 (1960-06-01), Potterer et al.
patent: 3850307 (1974-11-01), Motoda
patent: 4383455 (1983-05-01), Tuda et al.
patent: 4500251 (1985-02-01), Kiryu et al.
patent: 4546233 (1985-10-01), Yasuoka

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