Manual control for air conditioning in motor vehicle - has control knob operating electrical element through friction wheels with adjustable stop positions

摘要

The device has a control knob (1) which rotates a control shaft (2) which passes through a vehicle dash panel (3) to rotate a friction wheel (4). This drives a smaller dia. friction wheel (5) connected to the shaft (7) of an electrical unit being controlled. This unit has its own travel limits for the control position and which comprise a step (8) against which reacts a protrusion (9) on the shaft. A protrusion (11) on the friction wheel shaft reacts with a stop (10) on the dash panel the travel being exceeded. This presents sufficient torque to ensure that the friction wheels slip. The use of adjustable steps ensures that an automatic positioning for the electrical control is provided without the need for indicators on the dash board.