| 摘要 |
A crank preventing device of an arm of shears is provided to precisely cut an object, to prevent a hinge shaft from being twisted so as to prolong lifespan of the hinge shaft and the shear. A crank preventing device of an arm of shears(1) includes a bulk cap(2) to be mounted to a boom leading end of an excavator, a fixed body(3) fixed to the bulk cap by a bolt, and a movable arm(4) coupled with the fixed body to rotate. The fixed body includes a hydraulic cylinder(7) mounted to rotate the movable arm about a turning cover(6) between the bulk cap and a hinge shaft(5) to couple the bulk cap with the movable arm. A fixed blade(31) and a movable blade(41) are attached to respective cutting units of the fixed body and the movable arm. In order to prevent the movable blade from being pushed in the direction opposite to the fixed blade when the fixed blade of the fixed body and the movable blade of the movable arm cut an object such as a reinforcing rod, the hinge shaft is transformed. The upper sides of the fixed body and the movable body are coupled with each other by a supporting bolt to prevent the movable arm from being separated. |
