Rib expander

Details Rib expander Rib expander

1975-09-23

1977-03-08

Gilliam, Paul R.

61 42, 61 84, E21D 1112

Patent

active

040106160

ABSTRACT:
A rib expander, for use with tunnelling apparatus, in which a plurality of arcuate segmental members form a ring, at least two of the members being separable longitudinally to expand the ring. The ring is mounted to provide pivotal movement about a vertical circumferential axis of the ring as well as transverse movement in the plane of the ring and movement along the normal axis of the ring.

REFERENCES:
patent: 1292203 (1919-01-01), Wolfe
patent: 2919121 (1959-12-01), Ruth
patent: 3373571 (1968-03-01), Records
patent: 3411826 (1968-11-01), Wallers et al.
patent: 3550389 (1970-12-01), Khodosh et al.
patent: 3716997 (1973-02-01), Rees et al.
patent: 3800549 (1974-04-01), Lebbe
patent: 3896629 (1975-07-01), Stevens
patent: R26132 (1967-01-01), Cerutti

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