The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2008
Filed:
Nov. 02, 2006
John C. Stankus, Canonsburg, PA (US);
John G. Oldsen, Butler, PA (US);
John C. Stankus, Canonsburg, PA (US);
John G. Oldsen, Butler, PA (US);
Jennmar Corporation, Pittsburgh, PA (US);
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.