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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0118363 (1980-02-04) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 4 인용 특허 : 4 |
A safety device for a drilling rig of the type wherein a drill-carrying cradle is caused to move upwardly or downwardly on a tower by a chain which traverses sprockets at opposite ends of the tower. Shock loads and vibration cause premature failures in the chain when withdrawing a drill string as th
In a rotary and/or percussion drilling rig of the type having a vertically-extending tower provided with a guideway for a drill-carrying cradle, sprocket means at opposite ends of said tower, and chain means movable around said sprocket means and connected to said cradle whereby movement of the chai
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