Protractor for measuring angle between longitudinal axes of towing vehicle and trailer, has housing units connected to each other by joint, and sensor producing signal that represents change of angle position of one unit relative to other

摘要

The protractor has two housing units (24, 26) that are rotatably connected to each other using a circular swivel joint (28). The unit (24) is mounted in a position of a trailer drawbar (14, 16) in which a swivel axis (20) runs through a center of the swivel joint. A code carrier (60) has a sensor (62) that produces a signal representing an angle position and a change of the angle position of the unit (24) relative to the unit (26).