Lifting apparatus
OwnerMitsuhiro Kishiinventor
Life of this patent
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Abstract
A lifting apparatus comprising a basic support, a link-mechanism of the pantograph type extensively supported on the support, a platform provided on the link-mechanism, and driving devices actuated by hydraulic pressure to stretch the link-mechanism upwards. Each of the driving devices is comprised of a hydraulic cylinder, guiding members provided on opposite ends of the hydraulic cylinder, and a flexible connecting member. Both ends of the connecting member are connected respectively to upper and lower link levers of the link-mechanism, with the connecting member being in contact with the guiding member. Thus, the extension movement of the cylinder is transmitted to the link levers by the connecting member to stretch the link-mechanism of the pantograph type.
Claims7
A lifting apparatus comprising
- a support,
- a work platform, and
- a pantographic lifting mechanism
- operatively coupled between said support and said work platform for elevating said work platform away from said support, said pantographic lifting mechanism including a plurality of pivotally connected X-link units, each of said X-link units having a pair of transversely spaced sets of two link levers pivotally connected at adjacent mid-portions of the link levers as a scissors linkage, the pivotal connection of said X-link units being at adjacent end portions of said link levers and actuating means operatively connected between adjacent pivotally connected ones of said link levers and actuatable for stretching said pantographic lifting mechanism, said actuating means including a floating hydraulic cylinder free from affixation to said pivotally coupled X-link units, a pair of guiding members rotatably mounted on each opposite end of said floating hydraulic cylinder, and a respective flexible connecting member having opposite ends fixed respectively to said adjacent pivotally coupled link levers and trained around said guiding members, whereby when said hydraulic cylinder is extended, said guiding members will be displaced away from each other to cause said opposite ends of said flexible connecting member to move away from each other for thereby forcing said adjacent pivotally coupled link levers to diverge away from each other.
Dependencies are inferred from the claim text.