| 摘要 |
The open ended wrench includes a manually graspable handle and a nut-seizing jaw formation connected to the handle. The jaw formation has a nut-receiving opening therein defined between an upper jaw member, a lower jaw member spaced a fixed distance from the upper jaw member and a jaw back portion extending between the upper and lower jaw members. A slot communicates with the opening and extends through the jaw back portion. A plurality of substantially equal length shims are longitudinally slidable through the slot from a location outside of the opening to a location inside of the opening to provide a variable dimension for the nut-receiving opening. Each of the shims has an interlock formation for preventing any shim from being located inside of the opening unless there is supportive contact with the jaw. In one embodiment, each shim has one end thereof formed with an offset end portion including an inclined section extending angularly from the plane of the shim and an end section extending from the inclined section. The offset end portion defines the interlock formation. In another embodiment, some of the shims are from a first group of shims which are rolled from stock having a first thickness dimension and some of the shims are from a second group of shims having a second thickness dimension slightly larger than the first thickness dimension. Each group of shims has essentially the same tolerance range, whereby nesting and stacking of said two groups of shims having different basic thickness dimensions is facilitated. Also, the wrench includes a manually manipulatable releasable locking assembly for releasably locking the shims in a desired position against the upper jaw member.
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