| 摘要 |
A hydraulic cylinder of a quick coupler has an elongated hole formed at either a cylinder rod or a cylinder body such that one of the cylinder rod and the cylinder body is fitted onto a cylinder shaft of a coupler body and the other is rotatably coupled to a movable hook, and rotates the movable hook such that the movable hook is coupled to or released from a second coupling pin according to extension or retraction. A rotary key has a rotary key protrusion inserted into or withdrawn from a coupling groove of a fixed hook according to a rotation position thereof, and the rotary key protrusion is maintained in a state in which the protrusion is inserted into the coupling groove of the fixed hook by means of the elastic force of a rotary key spring, so as to prevent the separation of a first coupling pin from the coupling groove of the fixed hook. A stopper has a stopper hook coupled to or separated from a cylinder hook around the elongated hole, is supported by the elastic force of a stopper spring, and rotates the rotary key such that the rotary key protrusion is withdrawn from the coupling groove of the fixed hook when the hydraulic cylinder is retracted. |
