Hydraulic Jack with locking mechanism
OwnerDave Woodbury, Joe Otterstominventors
Life of this patent
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Abstract
The invention relates to a safety protection device to prevent a lifting mechanism of a jack from completely retracting in the case of a mechanical failure in the lifting mechanism or inadvertent operator error in prematurely releasing the lifting mechanism. The invention also relates to a safety device release mechanism allowing the operator to disengage the safety mechanism, wherein the release mechanism is preferably mountable in a location suitably remote from the lifting mechanism, for example, the release mechanism may be detachably mounted on the handle.
Claims21
A safety device for a jack comprising:
- a pawl rigidly affixed to a main body of a jack;
- a ratchet rigidly affixed to a lifting arm of the jack and having a plurality of teeth configured to engage the pawl, wherein raising the lifting arm of the jack causes the ratchet to travel substantially parallel to a main body of the jack and advance past the rigidly affixed pawl as the lifting arm is raised, wherein engagement of the pawl with the teeth of the ratchet positively restricts downward movement of the lifting arm when a lifting force is removed from the lifting arm.
A hydraulic floor jack with a safety system, jack comprising:
- a hydraulic floor jack having at least two lifting arms, a hydraulic lifting system in communication with the at least two lifting arms, a main body comprising two substantially parallel outer walls and having a front end designed to face the object to be lifted and a rear end, and a handle with one end in communication with the hydraulic lifting system and a second end located distal to the main body;
- the main body having a rigid member extending between the two outer walls near the front end of the jack and wherein the hydraulic lifting system is located at the rear of the main body;
- a ratchet rigidly affixed to the at least two lifting arms and having a plurality of teeth;
- a pawl pivotally connected to the main body between the two substantially parallel outer walls, wherein the pawl is configured to actively engage the ratchet as the lifting arms are raised;
- and
- a linkage cable connecting the pawl to a housing located on the distal end of the handle.
Dependencies are inferred from the claim text.