US Patent 8046925 Pruning hook having an energy-saving function

A pruning hook includes an extension shank, a blade unit including a fixed blade mounted on the extension shank and a movable blade pivotally connected with the fixed blade, a driving cord to drive the movable blade, a slide movably mounted in the extension shank to drive the driving cord, a pull cord mounted in the extension shank to drive the slide, and a pulling member movable relative to the extension shank to drive the pull cord. Thus, the pulling member is pulled by a user's arm to drive the blade unit so that the blade unit is driven by a greater force applied by the user's arm and has a larger shearing force to perform a cutting action in an easier manner so as to cut a larger object easily and conveniently.