Device for sealing a roof of an excavation

Details Device for sealing a roof of an excavation Device for sealing a roof of an excavation

1975-10-28

1976-10-05

Taylor, Dennis L.

E21D 1544

Patent

active

039837106

ABSTRACT:
A device for sealing a roof of an excavation, such as a mine shaft, including a wide surface support member or cave-in shield, which is adapted to be supported in the excavation at an angle to the roof. An open top wide surface roof cap structure is pivoted to the upper end of the support member and it comprises a plurality of nested substantially U-shape members having widely spaced apart legs which are pivoted to the upper end of the support member and which extend downwardly in the form of a shutter or bellows to the support member. The widest one of the U-shape members is formed as an extension of the horizontal portion and the intermediate ones are disposed at separate respective angles closing the space between the cap and the support member.

REFERENCES:
patent: 2311413 (1943-02-01), Persson
patent: 3921409 (1975-11-01), Blumenthal

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