JOINT AND JOINT PARTS FOR DRILL STRING COMPONENTS AND COMPONENTS
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United States of America Patent
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May 18, 2015
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May 16, 2014
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Abstract
A joint for joining together drill string components of a drill string for percussion drilling, the joint including a male part and a female part, wherein a first impact surface is arranged to co-operate with a second impact surface. When the drill string is in operation, relative axial movement is allowed between the male and the female parts when the first and the second impact surfaces are adjacent to each other. The invention also concerns a male joint part, a female joint part, a drill rod, a shank adapter, a drill head, a drill bit and a drill string component.
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