Crowd rope take-up system for mining shovel
First Claim
1. A mechanism for adjusting the length of a continuous loop crowd rope for extending and retracting a handle supported on a boom and carrying a dipper, comprising:
- a cylinder slidably mountable at the rear end of the handle remote from the dipper, and having external screw threads;
a sheave mounted on the end of the cylinder and engageable with a loop of the crowd rope;
a nut wheel rotatable mounted to said cylinder, and having internal screw threads meshing with the screw threads of the cylinder and having external gear teeth; and
a worm gear engaging the teeth of the nut wheel to rotate the nut wheel and thereby adjust the position of the sheave to take up slack in the crowd rope.
7 Assignments
0 Petitions
Accused Products
Abstract
A crowd rope take-up mechanism is mounted on the end of a shovel handle remote from the dipper bracket. The mechanism includes a cylinder with external screw threads engaged by a nut wheel. The cylinder mounts a sheave that received a loop of the crowd rope. A worm gear engages gear teeth on the outside of the nut wheel. The cylinder is restrained against rotation and the nut wheel is captured longitudinally so that rotation of the worm gear by a power wrench is translated into longitudinal movement of the cylinder and sheave. The worm gear is locked against rotation by a removable plug.
-
Citations
6 Claims
-
1. A mechanism for adjusting the length of a continuous loop crowd rope for extending and retracting a handle supported on a boom and carrying a dipper, comprising:
-
a cylinder slidably mountable at the rear end of the handle remote from the dipper, and having external screw threads;
a sheave mounted on the end of the cylinder and engageable with a loop of the crowd rope;
a nut wheel rotatable mounted to said cylinder, and having internal screw threads meshing with the screw threads of the cylinder and having external gear teeth; and
a worm gear engaging the teeth of the nut wheel to rotate the nut wheel and thereby adjust the position of the sheave to take up slack in the crowd rope. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification