Distance-measuring device for a multiple telescopic cylinder

摘要

The distance-measuring device comprises three telescopic stages 6, 7, 8, which are arranged inside the multiple telescopic cylinder, may be pushed into one another, and are connected together by means of screw connections 10 and 11. The first telescopic stage 6 is connected firmly to the inner piston 3 of the multiple telescopic cylinder. The third telescopic stage 8 is positioned rotatably but axially fixed inside the stationary part 1 of the multiple telescopic cylinder. The screw connections 10 and 11 run in the same direction and have the same lead. They are not self-locking, so that the telescopic stages 6, 7, 8 follow the stroke movement of the multiple telescopic cylinder, as a result of which a rotational movement is generated in the second telescopic stage 7 and in the third telescopic stage 8. The rotational movement of the third telescopic stage 8 is proportional to the stroke change of the multiple telescopic cylinder. It is detected by means of a detector 15 mounted on the cylinder bottom 12. <IMAGE>