External control assembly for quick-release device of linear actuator

An external control assembly for a quick-release device of a linear actuator that has a quick-release device for a purpose of promptly returning a workpiece driven by the linear actuator to an initial position wherein the quick-release device has the external control assembly primarily composed of a collar and a handle and the said purpose of the quick-release device can be achieved by implementing the handle to rotate the collar wherein:

• the collar has a regular-polygon-shaped out periphery;
• the handle has an assembling portion and a gripping portion integrated with and extended from the assembling portion wherein the assembling portion comprises a assembling hole shaped in a regular-polygon shape corresponding to the out periphery of the collar and the handle is mounted onto the out periphery of the collar with the assembling hole;
• a reinforcement rib is arranged on the out surface of the assembling portion of the handle for enhancing the structural strength of the assembling portion;
• and
• a retaining rib and a retaining recess that can be retained mutually are respectively provided on the out periphery of the collar and the inner wall of the assembling hole.