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A linear actuator comprising a cabinet (1), an electric motor (2), a transmission (4), a gear housing (11), a spindle nut (6), a spindle (5), the actuator being furnished with an opening (20) in the gear housing (11), where a gear wheel power take-off (21) is accessible and may be equipped with opti

A linear actuator comprising a cabinet (1), an electric motor (2), a transmission (4), a gear housing (11), a spindle nut (6), a spindle (5), the actuator being furnished with an opening (20) in the gear housing (11), where a gear wheel power take-off (21) is accessible and may be equipped with optional equipment. The gear wheel power take-off (21) is constructed as a tooth gearing on a planetary wheel holder (16) in a planetary wheel and transfers a movement to the optional equipment, which is proportional to the movement of the spindle nut during its travel on the spindle.

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1. A linear actuator comprising: a gear housing,an electric motor attached to the gear housing,a spindle which extends into the gear housing and which includes a spindle nut, anda transmission in said gear housing which interconnects the electric motor with the spindle, said transmission comprising

1. A linear actuator comprising: a gear housing,an electric motor attached to the gear housing,a spindle which extends into the gear housing and which includes a spindle nut, anda transmission in said gear housing which interconnects the electric motor with the spindle, said transmission comprising a planetary gearing comprising a planetary gear and a planetary gear carrier with external teeth, and said gear housing defining an opening through which additional equipment can extend to connect with and be driven by said external teeth. 2. The linear actuator according to claim 1, including additional equipment constructed as a separate unit comprising a housing and a gear wheel protruding through the housing and wherein the housing is mounted in connection with the opening in the gear housing so that the gear wheel may be brought into mesh with the external teeth through the opening in the gear housing. 3. The linear actuator according to claim 2 wherein the housing comprises a position sensor in the form of a potentiometer secured in the housing by snap locking means. 4. The linear actuator according to claim 3, wherein the potentiometer is equipped with a gearing between the external teeth on the actuator and a shaft on the potentiometer, said gearing being adjusted so that a dynamic range of the potentiometer corresponds to a dynamic range of the spindle nut on the spindle between a first and a second point indicating length of stroke. 5. The linear actuator according to claim 2, wherein the gear wheel protruding through the housing is connected to the sensor system via at least one gear wheel. 6. The linear actuator according to claim 2, wherein the housing comprises a position sensor in the form of a pulse generator and at least one corresponding sensor, wherein the pulse generator is a magnet with at least one set of poles and the corresponding sensor is a Reed-switch or a Hall-element. 7. The linear actuator according to claim 6, wherein the magnet is a ring magnet located in connection with a gear wheel and is moved proportional to the gear wheel. 8. The linear actuator according to claim 6, wherein the sensor is mounted on a printed circuit board located in guides in the housing. 9. The linear actuator according to claim 7, wherein the ring magnet is positioned parallel to a gear wheel on a common shaft, which in connection with the gear wheel forms a gearing between the gear wheel power take-off on the gear housing and the gear wheel located on the shaft as the magnet, and thus calibrates the number of pulses given by the sensor relative to the travel of the spindle nut on the spindle. 10. The linear actuator according to claim 6, wherein the sensor operates electrically independent of an electrical system of the actuator and thus also registers a manual adjustment of the activation element of the actuator. 11. The linear actuator according to claim 2, wherein the housing is mounted over the opening in the gear housing and is secured by snap locking means and/or at least one screw. 12. The linear actuator according to claim 11, wherein said gear wheel includes peripheral teeth which are engaged with said external teeth. 13. The linear actuator according to claim 12, wherein said opening is generally rectangular.