Linear actuator

A linear actuator, comprising:

• a transmission mechanism, comprising:
• a motor;
• a gear set, driven by the motor;
• and
• a screw rod, driven by the gear set;
• a releasing mechanism, disposed between the gear set and the screw rod, the releasing mechanism comprising:
• a driving gear, connected with the gear set;
• a first clutch, connected on the driving gear;
• a second clutch, connected on the screw rod;
• and
• a sliding sleeve, being connectable with the first clutch and the second clutch;
• and
• a toggle restraining mechanism, disposed on a side of the releasing mechanism, the toggle restraining mechanism comprising:
• a stem;
• a rotating element, driven by the stem;
• and
• a restraining assembly;
• wherein the rotating element comprises:
• a restraining hole;
• and
• a rotating arm;
• the restraining assembly comprises:
• a restraining presser, connected on the rotating element;
• a restraining spring, disposed in the restraining presser;
• and
• an engaging element, elastically pushed by the restraining spring,
• wherein the stem is moved by an external force to rotate the rotating element, the rotating arm rotates with the rotating element to push the sliding sleeve, the sliding sleeve is pushed by the rotating arm to separate from the second clutch, and the engaging element is engaged in the restraining hole to restrain the rotating element from rotating when the rotating element rotates to a specific angle.