Sealing means for the drive members of drive shields

Details Sealing means for the drive members of drive shields Sealing means for the drive members of drive shields

1978-02-24

1979-05-22

Taylor, Dennis L.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

405141, E01G 302, E21D 906

Patent

active

041556682

ABSTRACT:
The drive members of a drive shield, which are mounted side-by-side for longitudinal displacement as is known per se, are provided with seals or packings to close off the gaps between adjacent members. Each seal or packing is composed of two flexible resilient parts joined to respective drive members. The seal parts slidably engage one another in sealing fashion. The parts of the seal may be of the same or disimilar shape but at least one of the parts is hollow with an interior cavity which can receive pressure medium used to expand the part to urge the contacting surfaces of the parts into close sealing contact. Lubrication between the contacting surfaces to permit sliding can be achieved by employing a suitable lubricating agent as, or in, the pressure medium and by allowing some of the pressure medium to pass from the interior cavity to the contacting surfaces.

REFERENCES:
patent: 3473829 (1969-10-01), Daniels
patent: 3581507 (1971-06-01), Stevens
patent: 4063425 (1977-12-01), Jutt et al.
patent: 4073521 (1978-02-01), Mena

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