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Class Information
Number: 175/294
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Combined with safety joint
Description: Apparatus combined with a joint between two parts which may be selectively uncoupled below ground independently of other joints in the apparatus, such that one part may be left in the bore while the other part is withdrawn therefrom.

Patents under this class:

Patent Number Title Of Patent Date Issued
8590642 Percussion hammer bit retention system Nov. 26, 2013
7267185 Bit retainer system Sep. 11, 2007
5086843 Oil tool release joint Feb. 11, 1992
4064953 Shear sub for drill string Dec. 27, 1977

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