Yieldable prop having a yield section

Details Yieldable prop having a yield section Yieldable prop having a yield section

2006-11-14

2006-11-14

Singh, Sunil (Department: 3673)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C248S354100

Reexamination Certificate

active

07134810

ABSTRACT:
A yieldable prop having a first end and a second end includes a first hollow conduit, a second conduit slidably received in the first hollow conduit, and a clamp assembly positioned adjacent the juncture of the first hollow conduit and the second conduit. A yield section is provided at the end of the first and/or second conduits, or at the juncture of the first and second conduits. The yield section includes a shroud spaced from an inner pipe to provide a space to receive a collapsible insert. An end of a conduit is positioned in the space and compresses the insert when the compressive load on the prop exceeds the compressive load capacity of the insert.

REFERENCES:
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patent: 3836174 (1974-09-01), Holman, Jr.
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patent: 5051039 (1991-09-01), Heiliger
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patent: 6409139 (2002-06-01), Du Pree
patent: 6481052 (2002-11-01), Beall
patent: 6571426 (2003-06-01), Chen
patent: 2209549 (1989-05-01), None
patent: 2260559 (1993-04-01), None

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