Material handling apparatus

Details Material handling apparatus Material handling apparatus

1987-08-31

1988-12-27

Spar, Robert J.

Material or article handling

Vertically swinging load support

Shovel or fork type

414697, 52118, 212268, 212269, B66C 2300, B66F 900

Patent

active

047937653

ABSTRACT:
An extendable material handling arm which is particularly suitable for use as a dipper stick of a back hoe digger. The arm has an outer member with a slot extending along its length, and an inner member provided with a digging bucket pivotally mounted adjacent one end. The inner member is encircled by the outer member for sliding therein to vary the effective length of the arm. A first support structure carried by the inner member adjacent the end remote from the bucket includes a support plate with a support surface for sliding contact with longitudinally extending portions of the outer surface of the outer member adjacent the slot. A pair of studs extend through the slot to secure the support plate to the inner member so that the end of the inner member remote from the bucket is supported within the outer member by holding portions of the outer member adjacent the slot between the plate support surface and a support surface on the inner member and clearance is left between the inner and outer members along side portions opposite and remote from the slot. A second support structure may be provided adjacent the end of the outer member nearest the bucket to provide sliding support for the inner member within the outer member, thus also avoiding direct contact between the inner and outer members. The sliding support of both support structures may be provided via low friction material such as self-lubricating cast nylon oil-impregnated material.

REFERENCES:
patent: 2316389 (1943-04-01), Atkinson
patent: 2685876 (1954-08-01), Sanderson
patent: 3337071 (1967-08-01), Clark
patent: 4604026 (1986-08-01), Barrett

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