Patent ID: 8015890

Claim:
A linear actuator comprising a) a cabinet having b) a reversible electric motor with a motor shaft mounting a sun wheel, c) a reduction gear with several stages, where a first stage with an input side is connected with the motor shaft, said first stage comprising a pair of gear wheels, engaged with said sun wheel, said gear wheels rotating planetary wheels engaged with an orbital wheel, d) a spindle whose one end is connected with an output side on a last stage in the reduction gear, and an opposite end of the spindle indicates the front end of the actuator, e) a spindle nut secured against rotation on the spindle such that this is moved to and fro on the spindle in response to the current direction of rotation of the motor, and wherein the spindle nut may be secured indirectly or directly to the structure in which the actuator is incorporated, f) a rear mount at a rear end of the actuator likewise for attachment of the actuator in the structure in which the actuator is to be incorporated, and g) a ball and ratchet overload clutch which is released at a predetermined torque, wherein the overload clutch is directly connected to the orbital wheel.