Patent ID: 11942286
Assignee: PHOENIX CONTACT ASIA-PACIFIC (NANJING) CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. The rotary knob switch according to claim 17, wherein in a case of the slider having a self-locking ramp:
when the rotary knob is rotated from zero position such that the control curved surface of the cam contacts the self-resetting ramp of the slider, the control curved surface of the cam presses the self-resetting ramp to cause it move downward and when a boss of the cam hits an angle-limiting block inside the fixing mount and is blocked, the rotary knob is at a first rotation angle, and at this moment a lower end of the control curved surface of the cam is snapped into the groove on the top of the self-locking ramp to realize the self-locking of the rotary knob at the first rotation angle position;
in a case where the slider has a self-resetting ramp:
the self-resetting ramp further comprises a vertical rib on an outer surface, an inner side of a sleeve comprises a groove, wherein the vertical rib is embedded in the groove in the sleeve;
when the rotary knob is rotated such that the control curved surface of the cam contacts with the self-resetting ramp of the slider, the control curved surface of the cam compresses the self-resetting ramp to cause it move downwards, at which point the spring is compressed;
when the control curved surface of the cam reaches the top of the self-resetting ramp, the bump on the top of the self-resetting ramp prevents the control curved surface of the cam from rotating further over the top of the self-resetting ramp, and at this moment the vertical rib moves to a bottom surface of the groove to restrict the self-resetting ramp from continuing to descend and restrict the cam from continuing to rotate, thereby reaching a second rotation angle;
when the rotating force to the knob is released, the restoring force of the spring makes the vertical rib leave the bottom surface of the groove in the sleeve, and the cam is reversely rotated from the second rotation angle to reset.