Hydraulic tensioner for mine roof support cables
AssigneeJennmar Corporation
InventorsJohn C. Stankus, Kendal L. Taylor
Life of this patent
Estimating the term…
Abstract
A hydraulic cable tensioning device having a main body and tensioning yoke formed from aluminum and being capable of delivering 5,000 psi to tension a cable bearing a barrel and wedge assembly such as in a mine roof bolt or a cable truss. The body defines a pair of cavities which each receive an elongated member bearing a piston which together act as dual action hydraulic cylinders. A cable receiving bore defined in the body receives a cable gripping member to grip the cable while the tensioning yoke pushes against the barrel and wedge assembly in response to forces from the hydraulic cylinders.
Claims7
A tensioning device for inducing tension in a cable having a fixed end, said tensioning device comprising:
- a unitary body defining a cable receiving bore and an elongated cavity;
- a cable gripping member received within said cable receiving bore;
- an elongated member received within said cavity and having a first end extending out of said body;
- a piston slidably fitted within said cavity and fixed to a second end of said elongated member, thereby defining a first chamber on one side of said piston and a second chamber on an opposite side of said piston;
- and
- a yoke attached to said first end of said elongated member, said yoke defining a bore aligned with said cable receiving bore and having an abutment surface, wherein said tensioning device is capable of being held overhead and simultaneously operated by a single operator, and said first chamber is able to receive an operating pressure of up to about 5,000 psi.
A tensioning device for inducing tension in a cable, the device including (1) a body having an elongated cable receiving portion and a pair of piston receiving members positioned on opposite sides of the cable receiving member, (2) a cable gripping member received within the cable receiving member, (3) an elongated member received within each piston receiving member and having a first end extending out of the body, (4) a piston slidably fitted within each piston receiving member and fixed to a second end of the elongated member, thereby defining a first chamber on one side of the piston and a second chamber on an opposite side of the piston, and (5) a yoke attached to the first ends of the elongated members, the yoke defining a bore aligned with the cable receiving member and having an abutment surface, wherein the improvement comprises:
- said body being an aluminum unitary member, said tensioning device capable of being held overhead and simultaneously operated by a single operator, and said first chamber able to receive an operating pressure of up to about 5,000 psi.
Dependencies are inferred from the claim text.