Patent ID: 8534167
Filing Date: 2013-09-17
Classification: B25B

Abstract:
1. An open end wrench capable of fast driving a workpiece, with the workpiece including first, second, third, fourth, fifth, and sixth sides respectively having first, second, third, fourth, fifth, and sixth force-receiving faces in a first rotating direction and respectively having first, second, third, fourth, fifth, and sixth force-receiving faces in a second rotating direction, with the open end wrench comprising, in combination: a body including a handle and a jaw portion formed on an end of the handle, with spaced first and second jaws formed on an end of the jaw portion opposite to the handle, with the jaw portion including a throat intermediate the first and second jaws, with the throat and the first and second laws together defining a wrenching space adapted for receiving the workpiece, with the first law including a force-applying face facing the wrenching space and facing the second jaw, with the jaw portion further including an arcuate sliding groove formed in the second jaw and facing the wrenching space, with a guide fixed in the sliding groove; a slide slideably received in the sliding groove, with the slide including opposite first and second ends, with the first end of the slide including a first wrenching face located outside of the sliding groove, with the slide further including an arcuate guiding slot with the guide received in the guiding slot, preventing the slide from disengaging from the sliding groove with the guiding slot including an abutting end, with the abutting end in contact with the guide when the slide is a free position; and an elastic device mounted between the body and the slide for returning the slide to the free position, wherein when the jaw portion is not engaged with the workpiece, the slide is in the free position, the first wrenching face of the slide is located in the wrenching space, the first wrenching face is not parallel to the force-applying face of the first jaw, and an extension line of the first wrenching face intersects an extension line of the force-applying face of the first jaw at a point away from the handle, wherein when the jaw portion receives the workpiece but does not drive the workpiece, the force-applying face of the first jaw abuts the first force-receiving face in the first rotating direction of the workpiece, the first end of the slide abutting the fourth force-receiving face in the first rotating direction of the workpiece, a buffering space is formed between the abutting end of the guiding slot and the guide, and the buffering space has an arc length, with the arc length of the buffering space being larger than half of the diameter of the guide, wherein when the jaw portion drives the workpiece and deforms elastically, the body rotates relative to the workpiece, the slide does not rotate together with the body due to the buffering space, and the buffering space allows the first end of the slide to abut the fourth force-receiving face in the first rotating direction of the workpiece when the jaw portion expands elastically.