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US 4,071,222 AGranted
Lifting platform
OwnerHoward Stanley Wrightinventor
Life of this patent
Estimating the term…
Abstract
A lifting platform which is supported from a base by a pair of X-linkages which are of the kind in which the foot of a first arm of the X is pivoted to the base, the foot of the second arm of the X slides on the base and the head of the second arm is pivoted to the platform. The invention is characterized by the head of the first arm being connected through a swinging link to the platform so the platform moves parallel to itself while being lifted.
Claims12
A lifting platform comprising:
- a platform;
- a base;
- a pair of X-linkages supporting said platform above said base, a lower end of a first arm of each of said X-linkages being pivoted to said basethe lower end of the second arm of each of said X-linkages being slidably mounted to said base, the upper end of said second arm being pivoted to said platform;
- a pair of swinging links, each having a first end pivotally connected to the upper end of a respective one of said first arms;
- a pair of further links, each having a first end pivotally connected to the upper end of said second arm and a second end pivotally connected to a respective one of said swinging links at a point remote from said first end of said swinging link;
- and
- means linking the second ends of said swinging links to said platform, whereby said platform is movable away from said base and said platform remains parallel to a fixed plane during the movement.
4 more elements
Dependencies are inferred from the claim text.