Yieldable prop having a yield section
AssigneeJennmar Corporation
InventorsJohn C. Stankus, John G. Oldsen
Life of this patent
Estimating the term…
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.
Claims9
A yieldable prop comprising:
- a hollow first conduit having a first end and a second opposite end;
- a second conduit slidably received in the second end of the first conduit;
- and
- a compression clamp securing the first and second conduits in a fixed relationship to one another, the compression clamp comprising:
- a housing having a first side, a second opposite side, and a passageway extending from the first side to the second side with opening of the passageway decreasing as the distance from the first side of the housing increases, the housing securely mounted on the first conduit adjacent the second end of the first conduit with the first side of the housing facing the second conduit;
- a compressing member mounting the outer surface of the second conduit and mounted in the passageway;
- and
- a yield section at the juncture of the first and second conduits, the yield section comprising:
- an outer sleeve having a first end and a second opposite end, the first end of the sleeve mounted to the second surface of the housing, inner surface of the outer sleeve spaced from outer surface of the second conduit to provide a space therebetween;
- and
- an insert in the space, wherein the second end of the first conduit is slidably received in the space with the insert between the second side of the housing and the second end of the first conduit.
Dependencies are inferred from the claim text.