Switch device
AssigneeKabushiki Kaisha Tokai Rika Denki Seisakusho
InventorsTakeshi Fujimoto, Masaya Murota, Takaho Kobayashi
Life of this patent
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Abstract
A switch device includes two fixed contacts and a movable contact of which position is changed when an operation unit is operated to selectively contact the fixed contacts. The switch device also includes a snap action mechanism that switches a contact state of the movable contact with the fixed contacts by deforming a spring portion in accordance with an operation amount of the operation unit. The switch device also includes a control unit that determines an operation state of the operation unit based on a detection signal received from the fixed contacts and the movable contact.
Claims8
A switch device operated to switch an activation state of a parking brake for a vehicle, the switch device comprising:
- a first contact unit and a second contact unit, each of the first contact unit and the second contact unit including:
- a first fixed contact;
- a second fixed contact;
- a movable contact of which position is changed when an operation unit is operated to selectively contact the first fixed contact and second fixed contact;
- and
- a snap action mechanism that switches a contact state of the movable contact with the first and second fixed contacts by deforming a spring portion in accordance with an operation amount of the operation unit;
- and
- a control unit including:
- a first port that is connected to the movable contact of the first contact unit;
- a second port that is connected to the second fixed contact of the first contact unit and the first fixed contact of the second contact unit;
- a third port that is connected to the movable contact of the second contact unit;
- and
- a fourth port that is connected to the first fixed contact of the first contact unit and the second fixed contact of the second contact unit,
- wherein the control unit is configured to detect a connection state of the first to fourth ports, determine an operation state of the operation unit based on the detected connection state, and switch the activation state of the parking brake based on the determined operation state of the operation unit.
Dependencies are inferred from the claim text.