| Patent Number |
Title Of Patent |
Date Issued |
| 6658968 |
Percussive rock drill bit and buttons therefor and method for manufacturing drill bit |
December 9, 2003 |
| A percussive rock drill bit includes a head portion with a forward surface surrounded by a peripheral surface. The peripheral surface supports a wreath of peripheral buttons. Front buttons are mounted to the forward surface inside the wreath of peripheral buttons. The button shave a |
| 6547891 |
Elongated percussive rock drilling element |
April 15, 2003 |
| The present invention relates to a martensitic, corrosion resistant steel for rock drilling with properties which is adjusted essentially with regard to resistance against corrosion fatigue. This has been obtained in that an elongated element for percussive rock drilling which includes a |
| 6508318 |
Percussive rock drill bit and buttons therefor and method for manufacturing drill bit |
January 21, 2003 |
| A percussive rock drill bit includes a head portion with a forward surface surrounded by a peripheral surface. The peripheral surface supports a wreath of peripheral buttons. Front buttons are mounted to the forward surface inside the wreath of peripheral buttons. The button shave a |
| 6238489 |
Methods and apparatus for masking a percussive drill member prior to a surface treatment thereof |
May 29, 2001 |
| A metallic drilling member is surface hardened except at an end portion, because the end portion is masked. The masking is achieved by placing on the end portion a lid which forms a slight gap around the surface being heat treated. During the heat treatment a furnace atmosphere enters th |
| 6220376 |
Drill bit and button |
April 24, 2001 |
| A drill bit has a plurality of cemented carbide buttons embedded in a front end of the drill body. Each button includes a cemented carbide body having a rear mounting portion embedded in the drill body, and a symmetrically shaped crushing end protruding from the drill body. The buttons a |
| 6095266 |
Drill rod and method for its manufacturer |
August 1, 2000 |
| A rock drilling rod is manufactured by placing free ends of first and second hollow rod components in abutment, and establishing relative rotation between the free ends to friction weld those free ends together. The first component comprises a thread and a clearance portion disposed |
| 5988301 |
Drill rod and method for its manufacture |
November 23, 1999 |
| A rock drilling rod is manufactured by placing free ends of first and second hollow rod components in abutment, and establishing relative rotation between the free ends to friction weld those free ends together. The first component comprises a thread and a clearance portion disposed |
| 5947215 |
Diamond enhanced rock drill bit for percussive drilling |
September 7, 1999 |
| A rock drill bit for percussive drilling includes a steel body in which six gauge buttons and a single front button are mounted. The gauge buttons are arranged symmetrically and equally spaced about a central axis of the bit. The front button is arranged along the central axis. The front |
| 5919578 |
Friction welded product and method for manufacturing thereof |
July 6, 1999 |
| A friction welded product for rock drilling and method for manufacturing thereof, the product including a first component (25) and a second component (22) of parent material joined by a friction weld (27). The components have a central inner passage (26) and both components are made |
| 5064004 |
Drill rod for percussion drilling |
November 12, 1991 |
| The present invention relates to a drill rod for percussion drilling machine comprising a rod or a sleeve-shaped element that is provided with a threaded portion for engagement with another correspondingly threaded drill rod element. In order to reduce the risk for pitting damage, the |
| 4951762 |
Drill bit with cemented carbide inserts |
August 28, 1990 |
| A drill bit of the percussion type includes a bit body of steel, a front portion of which is provided with at least one slot in which an insert is attached by brazing. Brazed between the insert and side walls of the slot are side plates which are of uniform thickness while being thinner |
| 4872515 |
Drill rod for percussion drilling |
October 10, 1989 |
| The present invention relates to a drill rod for percussion drilling machines comprising a rod or a sleeve-shaped element that is provided with a threaded portion for engagement with another correspondingly threaded drill rod element. In order to reduce the risk for pitting damage, the |
