Yieldable prop
AssigneeJennmar Corporation
InventorsJohn Stankus, John Oldsen, Demrey 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.
Claims15
(canceled)
The prop as claimed in claim 16, further comprising a bearing plate positioned at the first end of the yieldable prop and/or the second end of the yieldable prop:
4-9. (canceled)
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 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,
- wherein the clamp assembly comprises one or more compressible sleeves.
The prop as claimed in claim 15, wherein the jack assembly comprises:
- a jack body having a first jack end, a second jack end and defining a fluid inlet opening;
- a piston having a plunger and a piston arm, the plunger connected to one end of the piston arm and the plunger housed in the jack body;
- a second clamp assembly positioned at the second jack end of the jack body;
- a base defining a first partial orifice positioned at the other end of the piston arm, opposite the plunger;
- and
- a guide defining a second partial orifice positioned adjacent to the first jack end of the jack body.
The prop as claimed in claim 15, wherein the jack assembly comprises:
- a stock base;
- a dowel connected to the stock base;
- a manual ratchet jack attached to the dowel;
- and
- a stock head connected to the manual ratchet jack.
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 positioned adjacent to the first hollow conduit and the second conduit;
- at least one handle connected to the first hollow conduit and the clamp assembly;
- and
- a jack assembly positioned adjacent to the first conduit and the second conduit and operationally connected to the second conduit to at least move the second conduit out of the first conduit.
A yieldable prop having a first end and a second end comprising:
- a first hollow conduit;
- a second conduit slidably mounted in the first conduit;
- and
- a restraint arrangement comprising:
- a first member mounted on outer surface of the second conduit extending above the outer surface of the second conduit to limit movement of the second conduit in the first conduit;
- a second member mounted on outer surface of the first conduit;
- and
- an elongated member connected to the first and second members to at least limit movement of the second conduit out of the first conduit.
Dependencies are inferred from the claim text.