(under subclass 30) Pipe or rod lifters comprising clutch means for engaging with the pipe, rod, or the like, and mechanism for reciprocating said clutch means.
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106+, for analogous structures.
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173, Tool Driving or Impacting,
53+, for a tool drive in which a tool is reciprocated by tool shaft gripping means which release or yield to permit advance.
188, Brakes, particularly 67, for a brake mechanically connected to a relatively stationary structure and which holds a pipe or rod at various locations along the pipe's or rod's length for short, quick linear assembly or disassembly during a work or manufacturing operation or preparatory to a working operation done by the pipe, rod or a pipe supported tool.
