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US 7,334,968 B2Granted
Yieldable prop
AssigneeJennmar Corporation
InventorsJohn C. Stankus, John G. Oldsen, Demrey G. Brandon
Life of this patent
Estimating the term…
Abstract
A yieldable prop having a first end and a second end including a first hollow conduit, a second conduit slidably received in the first hollow conduit, a clamp assembly positioned adjacent to the first hollow conduit and the second conduit, and at least one handle connected to the first hollow conduit and the clamp assembly. The prop further includes a bearing plate positioned at the first end of the yieldable prop, wherein the bearing plate is selected from a shape comprising planar and volcano.
Claims20
A yieldable prop having a first end and a second end comprising:
- a first hollow conduit;
- a second conduit slidably received in the first hollow conduit;
- a clamp assembly comprising an engaging collar, the engaging collar having an inner surface, an opposite outer surface, a first end, an opposite second end, a first side extending from the first end to the second end, and a second side extending from the first end to the second end and spaced from the first side to provide a slit in the collar between the first side and the second side, wherein the clamp assembly is in an engaging position when the first side is spaced a first predetermined distance from the second side, and the clamp assembly is in a non-engaging position when the first side is spaced a second predetermined distance from the second side with the first predetermined distance less than the second predetermined distance, the clamp assembly mounted on the outer surface of the second conduit with the inner surface of the engaging collar in facing relationship to the outer surface of the second conduit, wherein with the clamp assembly in the engaging position, the clamp assembly is securely mounted on the outer surface of the second conduit, and the clamp assembly and the second conduit are prevented from sliding relative to one another, and with the clamp assembly in the non-engaging position, the clamp assembly and the second conduit are free to slide relative to one another;
- and
- at least one handle having a first end portion fixedly secured to the clamp assembly and a second end portion spaced from the first end portion fixedly secured to the outer surface of the first conduit, wherein with the clamp assembly in the engaging position, the clamp assembly and the second conduit are prevented from sliding relative to one another and the first conduit and the second conduit are prevented from sliding relative to one another, and with the clamp assembly in the non-engaging position the first conduit and the second conduit are free to slide relative to one another, and the first conduit and the portion of the clamp assembly fixedly secured to the first end portion of the at least one handle are in a fixed non-movable position relative to one another.
2 more elements
A yieldable prop having a first end and a second end comprising:
- a first hollow conduit;
- a second conduit having an end;
- a clamp assembly securely mounted on the outer surface of the second conduit to prevent the clamp assembly and the second conduit from sliding relative to one another, the clamp assembly has an end, with the end of the clamp assembly spaced from the end of the second conduit with a portion of the second conduit between the end of the clamp assembly and the end of the second conduit slidably received in the first conduit, wherein the clamp assembly comprises:
- a first split conduit defining a first inner surface and a first outer surface;
- a second split conduit defining a second inner surface and a second outer surface;
- at least one U-shaped bolt having a U-shaped portion and two threaded legs;
- a brace defining first and second leg orifices;
- and
- at least one handle having a first portion secured to the clamp assembly and a second portion of the at least one handle spaced from the first portion and secured to the outer surface of the first conduit to prevent the first conduit and the second conduit from sliding relative to one another.
6 more elements
A yieldable prop having a first end and a second end comprising:
- a first hollow conduit;
- a second conduit having an end;
- a clamp assembly comprising a first split conduit defining a first inner surface and a first outer surface, and a second split conduit defining a second inner surface and a second outer surface, the clamp assembly securely mounted on the outer surface of the second conduit with the first inner surface of the first split conduit and the second inner surface of the second split conduit in surface engagement with outer surface of the second conduit to prevent the clamp assembly and the second conduit from sliding relative to one another, the clamp assembly has an end, with the end of the clamp assembly spaced from the end of the second conduit with portion of the second conduit between the end of the clamp assembly and the end of the second conduit slidably received in the first conduit;
- and
- at least one handle having a first end portion secured to one of the split conduits of the clamp assembly and a second end portion of the at least one handle spaced from the first end portion and secured to the outer surface of the first conduit to prevent the clamp assembly and the second conduit from sliding relative to one another and to prevent the first conduit and the second conduit from sliding relative to one another, wherein the first hollow conduit has a predetermined inner surface configuration, the outer surface of the second conduit between the end of the clamp assembly and the end of the second conduit has a predetermined outer surface configuration which conforms to the predetermined inner surface configuration of the first conduit such that the portion of the outer surface of the second conduit between the end of the clamp assembly and the end of the second conduit can freely slide out of the first conduit when the second portion of the handle is not connected to the outer surface of the first conduit, and the first and second inner surfaces of the first and second split conduits, respectively of the clamp assembly has the same inner surface configuration as the outer surface of the second conduit underlying the inner surface of the first and second split conduits of the clamp assembly.
2 more elements
A yieldable prop having a first end and a second end comprising:
- a first hollow conduit having a first end and an opposite second end, wherein the second end of the first conduit is the first end of the yieldable prop;
- a second conduit having a first end and an opposite second end, wherein the second end of the second conduit is the second end of the yieldable prop;
- a clamp assembly having an end, wherein the clamp assembly is mounted on outer surface of the second conduit and the clamp assembly in the engaging position is securely mounted on the outer surface of the second conduit to prevent the clamp assembly and the second conduit from sliding relative to one another, wherein the end of the clamp assembly is spaced from the first end of the second conduit with a portion of the second conduit between the end of the clamp assembly and the first end of the second conduit slidably received in the first end of the first conduit;
- a C-shaped first rigid handle having a first end portion fixedly secured to the clamp assembly and a second end portion of the first handle spaced from the first end portion and fixedly secured to an outer surface of the first conduit, and
- a second rigid handle having its ends secured to outer surface of the second conduit for moving the second conduit out of the first conduit or for carrying the yieldable prop,
- wherein the first hollow conduit has a predetermined inner surface configuration the outer surface of the second conduit between the end of the clamp assembly and the first end of the second conduit has a predetermined outer surface configuration which conforms to the predetermined inner surface configuration of the first conduit such that the portion of the outer surface of the second conduit between the end of the clamp assembly and the first end of the second conduit freely slides relative to the first end of the first conduit, and
- wherein with the clamp assembly mounted on the outer surface of the second conduit in a non-engaging position, and the first end portion of the first handle fixedly secured to the clamp assembly and the second end portion of the first handle fixedly secured to the first conduit, the first and second conduits are free to move relative to one another and the first conduit and the clamp assembly are in a fixed spaced relationship to one another.
4 more elements
Dependencies are inferred from the claim text.