Drive shield

Details Drive shield Drive shield

1977-04-25

1978-09-12

Shapiro, Jacob

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

E01G 302

Patent

active

041126963

ABSTRACT:
A drive shield for use in tunnelling operations includes a generally cylindrical cutting edge supported by a frame. A knife shield is telescoped together with the cutting edge, the knife shield having a plurality of elongate members (or planks). Each of the planks is extensible relative to the cutting edge in the direction of tunnel advance. In use, all the planks are advanced relative to the cutting edge which is then advanced in a follow-up sequence.

REFERENCES:
patent: 1948707 (1934-02-01), Gilman
patent: 3306055 (1967-02-01), Tabor
patent: 3950956 (1976-04-01), Lobbe

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