Device for preventing ingress of dust through the annular gap be

Details Device for preventing ingress of dust through the annular gap be Device for preventing ingress of dust through the annular gap be

1980-12-05

1983-06-21

Purser, Ernest R.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Cleansing fluid passage

299 89, 277 24, 277135, 277DIG1, E21C 3522

Patent

active

043890750

ABSTRACT:
For the purpose of sealing the annular gap between a cutting arm (2) and cutting heads (6) rotatably supported on this cutting arm (2), a main sealing (12) and an additional sealing element (13) is provided. The area of the annular gap (17) is rinsed by water flowing from the gap in outward direction, the water supply conduit (18) opening into the outward area, being designed as a labyrinth, of the gap (7) via a nozzle (17) (FIG. 3).

REFERENCES:
patent: 3236530 (1966-02-01), Zagorski
patent: 3698769 (1972-10-01), Amoroso
patent: 4123069 (1978-10-01), Sato
patent: 4183417 (1980-01-01), Levefelt

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