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    • 1. 发明授权
    • Cruciform,collapsible tools,such as tire wrenches and the like
    • CRUCIFORM,可拆卸工具,如轮胎扳手和类似
    • US3587366A
    • 1971-06-28
    • US3587366D
    • 1969-02-10
    • HORST KLEINSCHAEFER MANFRED
    • KLEIN HORSTSCHAEFER MANFRED
    • B25B13/00B25G1/00
    • B25B13/005
    • A TOOL, SUCH AS A TIRE WRENCH, COMPRISES TWO ARMS JOINED BY A THREADED BOLT FOR RELATIVE PIVOTAL MOVEMENT FROM A FOLDED STORING POSITION TO A CRUCIFORM WORKING POSITION. TO DECREASE THE BEINDING FORCES ON THE BOLT WHEN THE TOOL IS UTILIZED, A COUPLING IS LOCATED BETWEEN THE ARMS AND RETAINED IN PLACE BY THE BOLT. THE COUPLING COMPRISES A DISC HAVING A FIRST GROOVE IN ONE SIDE, AND A SECOND GROOVE AT RIGHT ANGLES TO THE FIRST GROOVE IN THE OPPOSITE SIDE. IN THE CRUCIFORM WORKING POSITION, THE ARMS INTERFIT WITHIN THE GROOVES, AND THE THREADED BOLT IS TIGHTENED TO HOLD THE ARMS AND COUPLING IN THEIR INTERCONNECTED POSITIONS. MANUAL FORCES ON ONE ARM ARE RESOLVED BY THE COUPLING INTO A LARGE TENSILE FORCE COMPONENT ACTING AXIALLY ON THE BOLT AND A NELIGIBLE BENDING FORCE COMPONENT ALSO ACTING ON THE BOLT. THE TENSILE FORCE ON THE BOLT ACTS TO INCREASE THE FRICTIONAL CONTACT BETWEEN THE SURFACES OF THE SECOND ARM AND ITS GROOVE, WHEREBY THE MAJOR PORTION OF THE MANUAL FORCES ON THE FIRST ARM IS TRANSMITTED TO THE SECOND ARM BY THE FRICTIONAL CONTACT. FOR BETTER FRICTIONAL ENGAGEMENT, THE INTERFITTING SURFACES OF THE GROOVES AND ARMS MAY BE ROUGHENED.