FASTENING TOOL WITH EARTH FUNCTION
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United States of America Patent
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app pub date -
Jun 12, 2017
filing date -
Mar 6, 2015
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Abstract
A fastening tool according to the invention includes: a female screw member (10) having an inverse screw that is fixed to the first member (1); a collar bolt (11) that is screwed with the female screw member (10); a fastening bolt (27) that is inserted into a center hole (19) of the collar bolt (11) from the second member side (2) and rotates the collar bolt (11) through a torque transmitter (25), thereby moving the collar bolt to a position colliding with the second member (2); and a fastening nut (33) that is fixed to the first member (1). An earth claw (21) protruding toward the second member (2) is formed at an outer periphery of an end surface of the collar bolt (11) facing the second member. The earth claw (21) is configured to bite into the second member (2) in an axial direction due to axial force generated by screwing the fastening bolt (7) with the fastening nut (33), thereby breaking an insulating coating layer (3) and thus ensuring electrical conduction.
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