Pantagraph-type jack, and process for producing the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 19, 2000
Grant Date -
N/A
app pub date -
Dec 30, 1999
filing date -
Apr 15, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pantagraph-type jack includes a pair of lower arms and a pair of upper arms. Upper ends of the lower arms and lower ends of the upper arms are connected to each other through first and second connecting shafts. An externally threaded rod is rotatably but axially non-movably supported on the first connecting shaft and threadedly engaged with a threaded bore provided in the second connecting shaft. In the pantagraph-type jack, the externally threaded rod is formed into a hollow shape, and external threads of the externally threaded rod are provided with a tapered portion formed in a convergent shape over a given light-loaded area from a tip end on the side of the second connecting shaft. Thus, a reduction in weight of the externally threaded rod can be provided, and the threaded engagement of the externally threaded rod with the threaded bore in the second connecting shaft can be conducted easily, which contributes to a reduction in weight and an enhancement in assemblability.
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