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| Number | Title | Issue Date |
| 6168542 | Crowd rope take-up system for mining shovel 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 ro... | 01/02/2001 |
| 4488849 | Power shovel A power shovel comprises a boom which is supported on an undercarriage and can be lifted and lowered. A hydraulically operated shovel mechanism is mounted at a front end of the boom before pivoting about a horizontal axis. The shoveling mechanism carries ... | 12/18/1984 |
