초록 ▼

A hand held power assisted shears has a piston located in a cylinder formed in a pistol grip body. A trigger controls the position of a hollow shuttle spool rod which slides longitudinally within a hollow piston rod connected between the piston and the blades. The hollow shuttle spool rod carries pr

A hand held power assisted shears has a piston located in a cylinder formed in a pistol grip body. A trigger controls the position of a hollow shuttle spool rod which slides longitudinally within a hollow piston rod connected between the piston and the blades. The hollow shuttle spool rod carries pressurized working fluid to the piston where it is directed to the space above or below the piston. The piston drives the blades through the piston rod to a position corresponding to the position of the trigger allowing the operator to continuously control the position of the blades and the extent and rate of closure during cutting. The relative position of the shuttle spool rod and the piston rod controls whether the working fluid is directed above or below the piston to open or close the blades. One end of the shuttle spool rod acts as a piston which causes the blades to open automatically when the trigger is released. The blades and trigger may be removed without tools for cleaning the shears or sharpening the blades.

대표청구항 ▼

[ Thus, having described the invention, what is claimed is:] [1.] A hand held power assisted shears comprising:a body having a cylinder formed therein;a pair of blades pivotally connected together for motion between an open and a closed position;a piston located within the cylinder and sliding longi

[ Thus, having described the invention, what is claimed is:] [1.] A hand held power assisted shears comprising:a body having a cylinder formed therein;a pair of blades pivotally connected together for motion between an open and a closed position;a piston located within the cylinder and sliding longitudinally therein, the piston dividing the cylinder into first and second chambers on opposite sides of the piston;a piston rod having a first end connected to the piston and a second end connected to drive at least one of the blades;a shuttle spool rod sliding longitudinally relative to the piston rod, the shuttle spool rod including:a pressure passageway,an exhaust passageway,a pressure outlet, connected to the pressure passageway, andan exhaust inlet, connected to the exhaust passageway;a fluid inlet adapted for connection to a source of pressurized working fluid, the fluid inlet directing working fluid into the pressure passageway of the shuttle spool rod; anda trigger pivoted for motion between a shears closed and a shears open position, the trigger engaging to the shuttle spool rod for sliding the shuttle spool rod relative to the piston rod, the pivoting trigger moving the shuttle spool rod to connect the pressure outlet to the first chamber and the exhaust inlet to the second chamber when the trigger is pivoted towards the shears closed position;the shuttle spool rod being driven by the working fluid to connect the exhaust inlet to the first chamber and the pressure outlet to the second chamber when the trigger is released.