Retraction assemblies for expansible mandrels

Details Retraction assemblies for expansible mandrels Retraction assemblies for expansible mandrels

1984-11-13

1986-10-14

Husar, Cornelius J.

Hydraulic and earth engineering

Foundation

Columnar structure

405232, 242 72, 74110, E02B 1700

Patent

active

046169580

ABSTRACT:
An expansible mandrel for use in driving or withdrawing tubular piles has lengthwise sections which are subjected to expanding forces in a plurality of zones spaced lengthwise of the interior of the mandrel to establish their pile-gripping relationship. The pile-entering relationship of the sections is re-established by a series of transversely spaced pairs of assemblies spaced lengthwise of the mandrel with each pair between adjacent zones. Each assembly includes, in the disclosed embodiment, two coil springs each of which is confined in a tube. The tubes are spaced apart lengthwise of and are secured to one mandrel section. The proximate ends of the tubes back the springs. A connection through both tubes with the remote ends of the springs has a flexible portion trained about a pair of guides attached to said one section and about a retraction cleat attached to the other mandrel section opposite the space between the two guides holds the springs tensioned to an extent ensuring the re-establishment of the pile-entering relationship of the mandrel sections when expanding forces thereon are relieved.

REFERENCES:
patent: 3086783 (1963-04-01), Kelso
patent: 3264834 (1966-08-01), Guild
patent: 3779026 (1973-12-01), Guild
patent: 3802207 (1974-04-01), Guild et al.
patent: 4026117 (1977-05-01), Guild et al.
patent: 4074539 (1978-02-01), Guild et al.

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