Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1974-06-10
1976-10-12
Shapiro, Jacob
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 72R, E02D 730
Patent
active
039849929
ABSTRACT:
An expansible pile driving mandrel made up of two arcuate segments, each having a chordal stiffening web and a hydraulic cylinder carried by the web of one segment and passing the web of the other.
REFERENCES:
patent: 2871666 (1959-02-01), PIckman
patent: 3007318 (1961-11-01), Rusche
patent: 3064439 (1962-11-01), Cobi
Shapiro Jacob
Sheffer Abner
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