Patent ID: 7458261

Claim:
A liquid level detector comprising: a rotary member; a fixing member for pivotally supporting the rotary member; a displacement member fixed to the rotary member, rotating integrally with the rotary member; a detection means for detecting a displacement of the displacement member, fixed to the fixing member; a float floating on the liquid; an arm, one end side of which is fixed to the float, the other end side of which is fixed to the rotary member, for converting a vertical motion of the float, which is caused by a vertical motion of a surface of the liquid, into a rotary motion of the rotary member; a stopper portion formed in the arm; and a pair of regulating means arranged in the fixing member, coming into contact with the stopper portion of the arm so as to regulate a rotary angle range of the rotary member, wherein the liquid level position is detected according to a position of the displacement member detected by the detection means, the fixing member is provided with a plurality of pairs of regulating means, a rotary angle range of the rotary member, which is set by the pair of regulating means, is different for each pair of regulating means, and the stopper portion provided in the arm is a linear portion, which is parallel with a rotary shaft of the rotary member, formed between the rotary member and the float.