Expandable and contractible arms

Details Expandable and contractible arms Expandable and contractible arms

1986-12-12

1989-04-04

Spar, Robert J.

Material or article handling

Vertically swinging load support

Grab

74 8915, 403 60, 403 77, 901 14, 901 23, 901 28, B25J 1700

Patent

active

048181757

ABSTRACT:
An expandable and contractable arm is constituted by a plurality of expandable and contractable units and connecting devices including universal joints for serially interconnecting the units into the arm. Each unit includes at least three expandable and contractable operating members in the form of link mechanisms or double thread type expandable and contractable rods, and actuating devices for equally or unequally expanding and contracting the operating members so as to increase or decrease distances between the connecting members while maintaining them in parallel or inclined with respect to each other.

REFERENCES:
patent: 2766079 (1956-10-01), Browne
patent: 3371551 (1968-03-01), Profet
patent: 3395436 (1968-08-01), Sullivan
patent: 3404580 (1968-10-01), Valenti
patent: 3404581 (1968-10-01), Kraus
patent: 3438661 (1969-04-01), Bowen III

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