Contactless rotary pull switch

a rotary pull switch, contactless technology, applied in the direction of magnetic field change switch, pulse technique, transportation and packaging, etc., can solve the problems of increasing the cost and complexity of the switch, limiting the performance of the switch, and not being able to discern a distinct switching position
US20150288362A1Active Publication Date: 2015-10-08EATON INTELLIGENT POWER LIMITED
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
EATON INTELLIGENT POWER LIMITED
Publication Date
2015-10-08

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Abstract

A contactless rotary pull switch includes a switch knob assembly rotatable about an axis to a plurality of rotational positions and actuatable to at least one pull position, with the switch knob assembly including a knob element and a rotational shaft fixedly coupled thereto. A rotational magnet is coupled to the rotational shaft so as to rotate therewith, and at least one pull magnet is positioned separately from the rotational magnet. A rotational sensor senses a magnetic field generated by the rotational magnet to identify a rotational position of the switch knob assembly and at least one pull sensor senses a magnetic field generated by the pull magnet(s) to identify a pull position of the switch knob assembly. A rotatable arm member selectively enables / inhibits sensing of the magnetic field generated by the pull magnet(s) by the at pull sensor(s), to identify distinct pull positions of the switch knob assembly.
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Description

BACKGROUND OF THE INVENTION

[0001] Embodiments of the invention relate generally to rotary pull switches and, more particularly, to contactless rotary pull switches such as might be used as lighting switches for a motor vehicle.

[0002] In specialty vehicle markets—such as heavy trucks, agricultural equipment, and construction equipment, for example—various types of electrical switches are used as control switches for a variety of applications, including general vehicle features / applications (e.g., switching the motor vehicle lighting, the windshield wipers, the rear windshield heating, the cruise control functions, etc., on and off) and critical or safety related vehicle features / applications (e.g., power take-off (PTO) switches, “e-stop” type switches, etc.). With respect to a vehicle lighting switch in particular, a typical vehicle lighting switch includes a rotary control having at least three positions: all lights (parking lamps and headlamps) OFF, parking lamps ON, and all lights O...

Claims

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