Patent ID: 7390147

Claim:
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.