| 摘要 |
A PIVOTAL STRUCTURE OF A VEHICLE LIFTING DEVICE IS COMPOSED OF AT LEAST TWO SETS OF LIFTING MEANS(15,16) EACH MEANS INCLUDES A PAIR OF MAIN RODS(151,161), A PAIR OF UPPER RODS(153), A PAIR OF LOWER RODS(152), A LINKAGE (154), A CYLINDER(19), A SHAFT(21), A SOCKET(23) AND A PLATFORM(17). THE MAIN ROD (151) HAS A FIRST END PIVOTALLY ENGAGED TO THE PLATFORM (17), AND A SECOND END HAVING A ROLLER (155) DISPOSED THERETO FOR SLIDABLY ENGAGED TO A RAIL (13) DISPOSED ON OR IN THE GROUND. THE UPPER ROOD (153) HAS A FIRST END HAVING A ROLLER (156) DISPOSED THERETO FOR SLIDABLY ENAGAGED TO THE PLATFORM (17), AND A SWCOND END PIVOTALLY ENGAGED TO AN END OF THE LINKAGE (154) AND HAVING A PIVOTAL POINT (1531) NEAR THE SECOND THEREOF PIVOTALLYENGAGED TO THE MAIN RO (151) D WHEREIN AN UPPER LINK (157) IS CONNECTED BETWEEN THE TWO PIVOTAL POINTS OF THE PAIR OF THE UPPER RODS (153). THE LOWER ROD (152) HAS A FIRST END PIVOTALLY EBGAGED TO THE MAIN ROD (151) AND HAVING A PIVOTAL POINT CONNECTED TO THE OTHER END OF THE LINKAGE (154) WHEREIN A LOWER LINK (158) IS CONNECTED BETWEEN THE TWO PIVOTAL POINTS OF THE PAIR OF LOWER RODS (152), AND A SECOND END FIXEDLY ENGAGED TO THE SOCKET (23) ROTATABLY ENGAGED ON OR IN THE SHAFT (21) FIXEDLY TO THE GROUND. THE CYLINDER (19) IS CONNECTED BETWEEN THE UPPER AND THE LOWER LINKS. (157,158) (FIG. 3)
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