PRODUCING HYDRO-EFFLUX HAMMER USING CATALYST-FREE PDC CUTTERS

Downhole tool

Hybrid bit including earth boring and percussion elements for drilling earth formations

Drilling head for a percussive displacement ground drilling device and use of a drilling head for a percussive displacement ground drilling device

Downhole tool

Hybrid bit including earth-boring and percussion elements for drilling earth formations

Boring apparatus and method

Drilling tool

High torque constant velocity joint for downhole drilling power transmission

Boring apparatus and method

Hybrid bit including earth-boring and percussion elements for drilling earth formations

Rotary percussive piloted rock drill bit

Drill bit for pulling material through pilot-channel

Rotary percussive piloted rock drill bit

PERCUSSIVE DRILL BIT WITH MULTIPLE SETS OF FRONT CUTTING INSERTS

Percussive rock drill bit with flushing grooves

Hammering and rotatable drill bit

Boring apparatus and method

PERCUSSIVE ROCK DRILL BIT

Drill bit for a down-the-hole drill hammer having spirally arranged cutting inserts

Excavating tool

Drill bit assembly for a directional percussion boring system

Method and apparatus for plastic pipe drilling

Drill bit for rock drilling tool, and rock drilling tool

Drill bit with a force application device using a lever device for controlling extension of a pad from a drill bit surface

Method and apparatus for drilling large-diameter hole in ground

METHOD AND DRILLING APPARATUS FOR DOWN-THE-HOLE DRILLING

One-piece drill bit for single-pass anchor bolting and single pass drilling apparatus

Drilling apparatus having in-line extending wings and driving method thereof

Earth auger head and excavation method

Device for a drilling tool

Down-the-hole hammer with pilot and method of enlarging a hole

Drilling apparatus with percussive action cutter

Apparatus for on-grade boring

Percussive drill bit

Bit assembly

Bit assembly for a hammering drill

Drill bit assembly

Drilling apparatus