| 摘要 |
A fastening device including a bolt, screw or nut and a socket wrench therefor, each of the bolt, screw or nut and also the socket having polygonal surfaces one of which is greater in size and one of which is lesser in size, the greater such surface of the socket matching the greater surface of the bolt, screw or nut and the lesser such surface of the socket matching the lesser surface of the bolt, screw or nut. One feature is the provision of an auxiliary member which fits into the socket of the standard socket wrench, the auxiliary member providing the lesser polygonal surface for such socket. Another feature is the use of a round body or head having such greater or lesser polygonal surfaces. Yet another feature is the provision of a bolt, screw or nut and a corresponding socket each of which has three such polygonal surfaces one of which is the greatest, the second of which is lesser than said greater surface, and the third of which is lesser than said second polygonal surface whereby to provide a three-way drive to tighten or loosen the bolt, screw or nut. Still another feature is the provision of polygonal surfaces of different sizes in the socket which correspond with such surfaces on the bolt, screw or nut and which upon the application of torque to the socket tighten the engagement between the polygonal surfaces of the socket with the polygonal surfaces of the bolt, screw or nut.
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