Bimetallic indicator

Details Bimetallic indicator Bimetallic indicator

G - Physics

01

K

73/23

G01K 5/70 (2006.01) F16H 55/02 (2006.01) F16H 55/08 (2006.01) G12B 1/02 (2006.01)

Patent

CA 1311366

ABSTRACT OF THE DISCLOSURE: A bimetallic indicator includes a bimetal being deformed by a heat generated by an electric current supplied to a heat coil wound around the bimetal, a pointer moved in relation to the deformation of the bimetal and indicating a measured value in accordance with an amount of electric current supplied to the heating coil, a driving gear, which is rotated by the deformation of said bimetal, including two first pitch portions each having a plurality of teeth with a regular pitch and a second pitch portion provided between the first pitch portions and having a pitch larger than that of the first pitch portion, and a driven gear to which the pointer is mounted being engaged with the driving gear and rotated together with the pointer by the rotation of the driving gear. The rotation of the driving gear is transmitted to the driven gear only when the first pitch portion of the driving gear is engagement with the driven gear. When the driven gear is engagement with the second pitch portion of the driving gear, the driven gear is not rotated, so that the pointer is indicating a point in a zone which indicates that measuring object is in a normal condition.

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