Lifting Device with Release Mechanism that Moves with Lifted Object
AssigneeDesign Research & Development Corporation
InventorStephen Plzak
Life of this patent
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Abstract
Provided is a lifting device comprising: a hook or clip; secured to the hook or clip, one or more first pulleys; a second hook or clip; secured to the second hook or clip, (i) a release mechanism comprising a second pulley and a releasable lock for an engaged flexible serpentine article and, optionally, (ii) one or more third pulleys, the second and third pulleys collectively the beta pulleys; and the flexible serpentine article engaged, at a first end, to one or the other hook or clip, and serially engaged through the first pulleys and beta pulleys, to provide a nominal two-fold or greater mechanical advantage, wherein the other end of the serpentine article is last engaged, among above recited elements, by one of the first pulleys.
Claims16
A lifting device comprising:
- a hook or clip;
- secured to the hook or clip, one or more first pulleys;
- a second hook or clip;
- secured to the second hook or clip, (i) a release mechanism comprising a second pulley and a releasable lock for an engaged flexible serpentine article and, optionally, (ii) one or more third pulleys, the second and third pulleys collectively the beta pulleys;
- and
- the flexible serpentine article engaged, at a first end, to one or the other hook or clip, and serially engaged through the first pulleys and beta pulleys, to provide a nominal two-fold or greater mechanical advantage,
- wherein the other end of the serpentine article is last engaged, among above recited elements, by one of the first pulleys.
The lifting device of claim 0, wherein the post is comprised within a squared O-ring.
A method of lifting or lowering comprising:
- providing one or more first pulleys secured to a fixed object;
- providing a movable object secured to (i) a release mechanism comprising a second pulley and a releasable lock for an engaged flexible serpentine article and,
- optionally, (ii) one or more third pulleys, the second and third pulleys collectively the beta pulleys;
- providing the flexible serpentine article engaged, at a first end, to one or the other object, and serially engaged through the first pulleys and beta pulleys, to provide a nominal two-fold or greater mechanical advantage,
- wherein the other end of the serpentine article is last engaged, among above recited elements, by one of the first pulleys;
- and
- drawing on the other end of the serpentine article to lift the movable object, or controllably activating the releasable lock to controllably lower the movable object.
Dependencies are inferred from the claim text.