Quick-release pit prop

Details Quick-release pit prop Quick-release pit prop

1998-04-28

1999-10-19

Bagnell, David

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405288, 2483541, 2483543, E21D 1500

Patent

active

059677023

ABSTRACT:
A pit prop has two opposed ends and comprises two bearing plates located at the ends, two telescopically displaceable prop elements, a number of separate resiliently compressible rubber discs arranged adjacent each other and a tubular indicating element. The prop includes a further bearing plate with the discs being located between two bearing plates to permit yielding of the pit prop under a load. The indicating element has markings thereon to indicate the load condition of the prop. The prop includes a locking device for releasably locking the prop elements with respect to each other.

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patent: 5758854 (1998-06-01), Shih

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