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Harry A. I. Wiredal Patents |
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Inventor: Wiredal; Harry A. I.
Address: Sandviken, SE
No. of patents: 4
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 4687368 |
Thread structure for percussion rock drilling |
August 18, 1987 |
| A thread structure for interconnecting two elements in a percussion drill string comprising an interior cylindrical thread and an exterior cylindrical thread. The threads have abutting flanks which are straight along their abutting contact portions. The clearance (a) between the bott |
| 4545443 |
Means for drilling |
October 8, 1985 |
| Drilling means of the type having a pilot bit, a reamer and a guidemember mounted in the bottom end of the casing tube, and which transmits impacts to the casing. The guide member is snugly enclosed in the thickened mouth portion of the casing tube and has a plurality of channels which a |
| 4440244 |
Drill tool |
April 3, 1984 |
| A drill tool for rotary and/or percussion drilling with drill rod means (14) within casing tube means (15) comprises a centric cutting bit (11) and an eccentric reamer cutter (12), both provided with hard metal inserts. For purposes of obtaining a life of the drill tool as long as po |
| 4408669 |
Means for drilling |
October 11, 1983 |
| Drilling means of the type having a pilot bit, a reamer and a guidemember mounted in the bottom end of the casing tube, and which transmits impacts to the casing. The guide member is snugly enclosed in the thickened mouth portion of the casing tube and has a plurality of channels which a |
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