The present invention relates to a safety release mechanism for a linear actuator. The linear actuator has a lead screw and a telescopic tube. The safety release mechanism includes a nut, a protection shroud, a sleeve connected to the telescopic tube, a clutching element and a spiral spring. The nut is threadedly and drivingly connected to the lead screw. The protection shroud is fixedly and drivingly connected to one side of the nut. One end of the sleeve is sheathed on the protection shroud while the other end thereof is fixedly connected to the telescopic tube. The outer periphery of the sleeve is formed with notches. The clutching element is sheathed on the sleeve and formed with protrusions configured to be selectively inserted into the notches or removed there from. The spiral spring is sheathed on the protection shroud and the clutching element. With this arrangement, cleavage or damage of the above components can be prevented to thereby increase the safety during its operation.本發明係關於一種線性驅動裝置的安全釋放機構,線性驅動裝置具有導螺桿及伸縮管,安全釋放機構包括螺帽、螺帽護套、伸縮管套筒、離合元件及螺旋彈簧,螺帽是以與導螺桿相互螺接傳動;螺帽護套固接在螺帽的一側邊且彼此連動;伸縮管套筒一端套接螺帽護套另一端與伸縮管相互固接,並在伸縮管套筒外周緣成型有複數嵌槽;離合元件套接在該伸縮管套筒外部,且其成型有與各嵌槽相互嵌固或脫離連動的複數凸塊;螺旋彈簧環抱螺帽護套和離合元件。藉此,可以克服各傳動元件的驅動崩裂或損壞,更能增進操作使用的安全性。1‧‧‧安全釋放機構10‧‧‧螺帽11‧‧‧第一內螺紋12‧‧‧第一外螺紋20‧‧‧螺帽護套21‧‧‧擋牆23‧‧‧第二圓柱段24‧‧‧第二內螺紋30‧‧‧伸縮管套筒31‧‧‧中心孔32‧‧‧凸環321‧‧‧嵌槽33‧‧‧第二外螺紋40‧‧‧離合元件41‧‧‧擋環42‧‧‧凸塊50‧‧‧螺旋彈簧51‧‧‧環圈52‧‧‧間隔空隙60‧‧‧限位蓋
