| 摘要 |
In a pantagraph-type jack, a lower reinforcement plate (20) is integrally provided at an inner end of a bottom plate portion (7b) of each lower arm (7 ) so as to extend therefrom in parallel with a corresponding lower pivot (7), and a lower recess (28) is formed in an upper surface of a flange portion (20a) of each lower enforcement plate (20) so that the lower recess (28) receives a part of an outer peripheral surface of a threaded rod (4) when a load bearing platform (2) is lowered to a lowermost position. Also, an upper reinforcement plate (21) having the same structure is integrally provided at an inner end of an upper plate portion (8b) of each upper arm (8). Thus, it is possible to firmly restrict inward falling of sid e plate portions of the lower arms (7) and upper arms (8), and to lower the load bearing platform (2) to a lowermost position without interference by the above- described reinforcement structure.
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