PIVOTAL STRUCTURE FOR DRIVING HEAD OF WRENCH
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United States of America Patent
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Issued Date -
May 12, 2022
app pub date -
Jan 25, 2022
filing date -
Jan 25, 2022
priority date (Note) -
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status (Latency Note)
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Abstract
A wrench includes a handle and a working end, two arms extend from the working end to form a room between the two arms. Each arm includes a locking hole. A driving head is pivotably connected between the two arms. Two bolts are respectively and threadedly connected to the locking holes of the two arms, and inserted into the two recesses of the driving head to pivotably position the driving head. A wave washer is mounted to each of the two bolts and sandwiched between the driving head and the arm. The convex portions one side of each wave washer contact the outside of the driving head. The convex portions on other side of each wave washer contact the inside of the arm corresponding thereto. The friction between the driving head and the arms is reduced when the driving head is pivoted relative to the arms.
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