135350 ⎘
Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables; Apparatus for feeding the rods or cables ; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with a spring or an additional weight
COUNTERBALANCE SYSTEMS AND RELATED METHODS FOR CATWALK SYSTEMS
#2SPRING BAIL CYLINDER APPARATUS
#3PORTAL PILE DRIVER AND CAST-IN-PLACE PILE CONSTRUCTION METHOD
#4Counterbalance systems and related methods for catwalk systems
#5COMPENSATING RIG ELEVATOR
#6DEVICE FOR GENERATING AN AXIAL LOAD IN A DRILL STRING ASSEMBLY
#7Pump jack with counterbalance
#8Compensating rig elevator
#9Compensating rig elevator
#10Pipe connection system