| 摘要 |
A crowd handle mount for fixed boom shovels wherein the crowd handle is attached at its front end to a pivoted stiff leg in conventional fashion, and has its back end supported on a vertical strut that is pivotally mounted at its bottom on the shovel rotating frame and pivotally connected at its top to the crowd handle, whereby the rotating frame, stiff leg, crowd handle and strut form a four bar linkage. The crowd can be moved in crowd and retract directions by rope means reeved over sheaves on the crowd handle and in the gantry, or by means of a rack on the crowd handle and a pinion mounted in the gantry.
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