| 摘要 |
An operating device having a rotatable crank drive which can be actuated by repeatedly pressing and releasing a knob or push-button. The push-button is thus alternately fixed in an operating position, i.e. the out position, and a locking position, i.e. the pressed-in position. A rotatable locking ring which can be axially displaced in an elastic manner and the body of the operating device include crank or link elements which are alternately distributed around the circumference, and in which the knob or push-button can be securely locked in a precise position.
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