Expansible mandrel

Details Expansible mandrel Expansible mandrel

1976-06-11

1977-05-31

Shapiro, Jacob

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 72R, E02D 730

Patent

active

040261174

ABSTRACT:
An expansible mandrel for use in driving or withdrawing tubular piles has fluid pressure operated means both to effect the pile-gripping relationship of its sections and their retracted, pile-entering relationship, each including a plurality of sets of sheaves spaced lengthwise of the mandrel and from the sets of the other with a cable in such trained engagement therewith that a pull thereon by fluid pressure operated means effects the appropriate relationship of the mandrel sections.

REFERENCES:
patent: 3625013 (1971-12-01), Guild et al.
patent: 3779026 (1973-12-01), Guild et al.

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