Shield tunnelling machine

Details Shield tunnelling machine Shield tunnelling machine

1990-12-03

1992-04-07

Taylor, Dennis L.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Adjustable tooth

299 32, 299 80, 405141, 405138, E21D 908

Patent

active

051022010

ABSTRACT:
A shield tunnelling machine is provided that includes a cylindrical shield body; a rotary cutter head disposed on a front end of the shield body and provided with a face plate having one or a plurality of slits extending in the radial direction; and intermediate support member for supporting a plurality of cutter bits respectively having forward bit portions and backward bit portions in each of the slits; a support structure for supporting the intermediate support member swingably around an axis extending in the radial direction; a member for movably guiding the support structure in the axial direction of the shield body; and a cylinder device and a piston for moving the support stucture in the axial direction of the shield body to move the cutter bits toward and away from the front face of the face plate, the face plate and the guide member sharing the excavation force exerted against the cutter bits.

REFERENCES:
patent: 2389920 (1945-11-01), Mavor
patent: 2789806 (1957-04-01), Buttrick
patent: 3285665 (1966-11-01), Brown
patent: 4311344 (1982-01-01), Akesaka
patent: 4555143 (1985-11-01), Wrulich et al.
patent: 4630869 (1986-12-01), Akesaka et al.

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