| 摘要 |
An improved wrench includes a rigid band extending between a pair of spaced-apart end plates which are supported directly upon a common threaded shaft. In a preferred form of the invention, the band has a plurality of sequential and incremental flat surfaces extending along one edge between the end plates, and a file-like inner gripping surface strengthened by a V-shaped ridge forming the remainder of the band. As the shaft is rotated by hand about its longitudinal axis, one end plate remains generally stationary with respect to the shaft while the other end plate moves along the shaft either toward or away from the stationary end plate, depending on the direction of shaft rotation. When placed about a portion of an article such as an oil filter or the like, movement of the end plates toward one another causes the inner surfaces of the band to substantially uniformly grip the article about its circumference. This permits the application of high torque forces to the article without any slippage of the wrench about the article.
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