Metal deforming – By relatively receding work-engaging tool-faces
Patent
1988-08-23
1989-09-05
Larson, Lowell A.
Metal deforming
By relatively receding work-engaging tool-faces
B21D 3104
Patent
active
048627240
ABSTRACT:
An expander to repair elongate thin walled pipes or tubes of larger diameter is disclosed. Similar elongate expander beams are pivotally interconnected by plural, parallel articulating links for motion toward and away from each other. One of the beams is longer than the other and carries a hitch structure that is attachable to the ordinary three-point hitch of a wheeled tractor for locomotion, positioning, and powering of the expander. Hydraulic linkage communicates angularly between the expander beams to move them toward and away from each other for use.
REFERENCES:
patent: 2916076 (1959-12-01), Young
patent: 3710609 (1973-01-01), Jones
patent: 3934448 (1976-01-01), Hand
patent: 4803881 (1989-02-01), Dudley
Bergman Keith S.
Larson Lowell A.
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