Importance

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Abstract

A floor jack includes a frame having a handle with a control knob, and a pair of pivotal lift arms elevated by pushing the rearward ends by a push bar of a hydraulic cylinder. The cylinder has a control valve attached to a control shaft extending from the control knob. A pair of guide rail are attached to the bottom of the frame; and a pair of rack bars are slidably mounted on each guide rail, and has a forward end pivotally attached to the push bar. A pair of dogs are positioned above the rack bar, each having a rearward end pivotally attached to the frame and a forward for engaging a tooth of the rack bar. The forward end of the dogs engage the rack bar as the lift arms are elevated; and in the event of a hydraulic failure, the dogs lock the lift arms in the elevated position. A release includes a cam tube having a V slotted opening in the underside thereof. A swing plate has a cam follower stud slidably engaged within the V slotted opening. The swing plate includes linkage that is actuated by rotation of the control knob. An initial rotation of the control knob automatically rotates the cam tube to release the dogs, and further rotation opens the valve to lower the lift arms.

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First Claim