Invention Grant
- Patent Title: Yieldable prop having a yield section
- Patent Title (中): 具有屈服部分的可屈服支撑
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Application No.: US11555870Application Date: 2006-11-02
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Publication No.: US07390147B2Publication Date: 2008-06-24
- Inventor: John C. Stankus , John G. Oldsen
- Applicant: John C. Stankus , John G. Oldsen
- Applicant Address: US PA Pittsburgh
- Assignee: Jennmar Corporation
- Current Assignee: Jennmar Corporation
- Current Assignee Address: US PA Pittsburgh
- Agency: The Webb Law Firm
- Main IPC: E21D15/14
- IPC: E21D15/14

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.
Public/Granted literature
- US20070059109A1 Yieldable Prop Having A Yield Section Public/Granted day:2007-03-15
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