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A device for detecting a change in the thrust load acting on the actuating rod of a linear actuator. The thrust detecting device includes a pinion which converts and enlarges an axial linear displacement of a rotating drive screw shaft caused by a change in the load on an actuating rod driven by the

A device for detecting a change in the thrust load acting on the actuating rod of a linear actuator. The thrust detecting device includes a pinion which converts and enlarges an axial linear displacement of a rotating drive screw shaft caused by a change in the load on an actuating rod driven by the screw shaft into an angular displacement of a vertical shaft of the pinion. A circular scale plate is attached to the vertical shaft of the pinion and serves to indicate a preset value for the load change to be detected. A pair of striker plates each having a pointer effective to select a preset value on the circular scale plate and a striker effective to activate a corresponding limit switch are attached to the circular scale plate.

대표청구항 ▼

[ What is claimed is:] [1.] A thrust detecting device for a linear actuator having an actuating rod threaded with a rotating drive screw shaft and movable back and forth along the rotating drive screw shaft, comprising:a thrust load change absorbing spring fitted around the rotating drive screw shaf

[ What is claimed is:] [1.] A thrust detecting device for a linear actuator having an actuating rod threaded with a rotating drive screw shaft and movable back and forth along the rotating drive screw shaft, comprising:a thrust load change absorbing spring fitted around the rotating drive screw shaft;a thrust flange rotatably mounted on the rotating drive screw shaft for thrusting said absorbing spring and having a tubular portion, said thrust flange being movable back and forth along the rotating drive screw shaft;a plurality of annular threaded teeth formed on an outer peripheral surface of said tubular portion of said thrust flange;a pinion meshing with said annular threaded teeth, thereby converting the axial movement of the rotating drive screw shaft to rotation of said pinion;a pinion shaft rotatably driven by said pinion and having an end distant from said annular threaded teeth;a support plate secured to said distant end of said pinion shaft and rotatable therewith;at least one striker plate having a radially projecting limit-switch actuating striker attached to said support plate such that the striker plate is rotatable over said support plate about said pinion shaft, andat least one limit switch fixedly mounted for engagement by said actuating striker,wherein said striker plate can be selectively positioned on said support plate to provide a predetermined arcuate distance through which said actuating striker must travel before actuating said at least one limit switch.