gallows block
... [索赔的]举证责任 onus of proof of claim [网板架]顶部滑车 gallows block [网口部的]浮子纲 bosom of headrope ...
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网板架]顶部滑车 gallows block
位于重型井架或桅架式井架顶部的固定的滑轮组（称之为滑车轮槽轮），通过该滑轮组钻井钢丝绳进行穿绳。
The fixed set of pulleys (called sheaves) located at the top of the derrick or mast, over which the drilling line is threaded.
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