초록 ▼

A 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 spin

A 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.

대표청구항 ▼

[ What is claimed is:] [1.] A linear actuator which comprises:a housing,a motor,a spindle which is axially rotatable in opposite directions by said motor,a threaded nut mounted on said spindle and movable therealong with rotation of said spindle,a piston rod movable with said threaded nut as said th

[ What is claimed is:] [1.] A linear actuator which comprises:a housing,a motor,a spindle which is axially rotatable in opposite directions by said motor,a threaded nut mounted on said spindle and movable therealong with rotation of said spindle,a piston rod movable with said threaded nut as said threaded nut moves along said spindle,a transmission in said housing and operatively connected to said motor,a coupling means in said housing operatively connected between said transmission and said spindle, anddisengagement means for disengaging said spindle from said motor, said disengagement means including braking means adjustable relative to said housing for causing said coupling means to control rotational speed of said spindle when disengaged from said motor.