| 摘要 |
PURPOSE: A cam spanner is provided to efficiently tighten and loosen a bolt, a nut, and a pipe and to conduct all functions of a spanner and a socket wrench. CONSTITUTION: A cam spanner has an opened entrance whose diameter is the same as the head of a member such as a bolt or a nut and the member is rotatable in the spanner. A cam groove is formed in the spanner to rotate a cam(2). A spring(4) is installed in the cam to enable the cam to hold the member with restoring force. After that, the cam is mounted in the spanner. A wire(6) and a cam opening lever(7) are in a groove(8) of the spanner. When the cam opening lever is pulled, the cam is automatically opened.
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