| 摘要 |
PCT No. PCT/DK97/00597 Sec. 371 Date Jun. 17, 1999 Sec. 102(e) Date Jun. 17, 1999 PCT Filed Dec. 23, 1997 PCT Pub. No. WO98/30816 PCT Pub. Date Jul. 16, 1998A linear actuator includes a housing, a spindle rotatable in both directions, a threaded nut driving a piston rod, and a motor capable of driving the spindle through a transmission, a disengagement unit being arranged in the transmission for interrupting the connection between the motor and the spindle in case of operational failure, such as overloading of the spindle, the disengagement unit comprising brake means adjustable with respect to the actuator housing to cooperate with coupling means for control of the rotational speed of the spindle when this is disengaged from the motor. The linear actuator provides an emergency function ensuring that the linear actuator and the carried load are not damaged by overloading of the actuator. |
