Patent ID: 9155391
Filing Date: 2015-10-13
Classification: A47B,A47C,F16H

Abstract:
1. A linear actuator which comprises: a top flange; an electric motor having a rear fixture facing the top flange; a spindle, a transmission located between the top flange and the spindle and connected between the electric motor and the spindle for rotation of the spindle, a spindle nut non-rotationally mounted on the spindle and moveable back and forth along a length of the spindle based on a rotational direction of the motor and spindle, relative movement between the spindle and the spindle nut creating axial forces, a drive tube connected to the spindle nut to move longitudinally with back and forth movement of the spindle nut relative to the spindle, a compressible ring positioned between the top flange and the rear fixture, and a squeeze protection device positioned within the compressible ring, said squeeze protection device including a force-detecting element for detecting dynamic deviations of axial forces on the drive tube and emitting signals under load for stopping operation of the electric motor, said squeeze protection device including snap-locking means which engages with snap-locking means on the rear fixture to retain the device in connection with the motor.