| 摘要 |
A hydraulic floor jack has a tubular handle with a yoke at the distal end thereof with lateral axels pivotally attached to a pair of vertical side brackets. One side brackets has a series of arcuate upper surfaces concentric with the lateral axel of the yoke, including a large radius forward portion, then a small radius arcuate notch portion, then an intermediate radius rearward portion. The yoke has a barrel aligned radially over the circular upper surfaces of the side bracket, with a plunger therein having an upper end extending above the barrel and a lower end for extending below the barrel and into the arcuate notch portion. A plunger control level has a rectangular distal end that is pivotally attached to the upper end of the plunger. The control lever can position the plunger to fully extended into the arcuate notch portion for fixing the movement of the tubular handle; and can position the plunger to partially extend into the arcuate notch portion for freeing the handle to pump the hydraulic cylinder; and can retract the plunger from the arcuate notch portion for folding the handle over the hydraulic jack.
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