Definition(s)
Traveling Block
Two or more steel plates and other metal parts assembled into a framework within which are mounted one or more sheaves on which the hoisting line is reeved in connection with the sheaves on the crown block. The traveling block travels between the derrick or mast floor and the crown block.
Source: Petroleum Safety Orders–Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations