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Crown saver

A device mounted near the drawworks drum to keep the driller from inadvertently raising the travelling block into the crown block. A probe senses when too much line has been pulled onto the drum, indicating that the travelling block may strike the crown. The probe activates a switch that simultaneously disconnects the drawworks from its power source and engages the drawworks brake.

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  • Harry8L
  • (London, United Kingdom)

  •  (V.I.P) 574128 分数
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