Patent ID: 9560724
Date: 2017-01-31
CPC Classifications: G01D,H01H,H05B

Claim:
1. A dual encoder having comprising: a housing: a first shaft rotatably mounted in the housing, the first shaft including a second shaft being rotatably mounted in the housing, the second shaft coaxial with respect to the first shaft, the second shaft including a first activation element associated with the first shaft; a second activation element associated with the second shaft, the first and second activation elements for transmitting adjusting movements onto the first shaft and the second shaft a first locking ring arranged at the first shaft a second locking ring arranged at the second shaft for co-rotation, the first and second locking rings made of a magnetizable material, the first and second locking rings having multiple radial extensions proximate the outer circumference of the first and second locking rings, and at least one magnet arranged in the housing, opposite to the radial extensions, wherein the width of the air gap between the magnet and the first and second locking rings varies, depending on the rotational position to vary a magnetic holding force and cause locking at different rotational positions of the first and second shafts with respect to the housing, said magnetic holding force depending on the width of the air gap.