Shield-type tunneling machine with toggle controlled bit plates

Details Shield-type tunneling machine with toggle controlled bit plates Shield-type tunneling machine with toggle controlled bit plates

1980-04-14

1982-01-19

Purser, Ernest R.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

With mine roof-supporting means

299 80, 405144, E21D 908

Patent

active

043113443

ABSTRACT:
In a shield-type tunneling machine, a pair of comb-type bit-plates are pivotally supported on a peripheral wall of each cutter slit provided in a cutter disc. In order to adjust a degree of opening of each slit as well as a cutting angle of the bits with respect to the facing, the bit plates are pivotally moved to an open position or a close position for opening or closing each slit, in association with the reciprocating motion of a slide shaft disposed in a hollow drive shaft which rotates the cutter disc.

REFERENCES:
patent: 1870050 (1932-08-01), Hunt
patent: 3561223 (1971-02-01), Tabor
patent: 3917351 (1975-11-01), Pirrie et al.

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