Cross-coil type indicating instrument having a zero-return magne

Details Cross-coil type indicating instrument having a zero-return magne Cross-coil type indicating instrument having a zero-return magne

1999-01-22

1999-11-16

Patidar, Jay

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With electromagnetic field

324144, G01R 120

Patent

active

059864451

ABSTRACT:
A cross-coil type indicating instrument includes a bobbin, a cross-coil unit disposed around the bobbin, a shaft, a permanent magnet rotor disposed inside the bobbin, a dial having a zero position, a pointer carried by the shaft, and a magnetic shield casing for accommodating the bobbin. The magnetic shield casing has a projection member extending from the bottom thereof at a peripheral side of the cross-coil unit to meet one of magnetic poles of the permanent magnet when the pointer returns to the zero-position.

REFERENCES:
patent: 4492920 (1985-01-01), Reenstra
patent: 4724601 (1988-02-01), MacManus et al.
patent: 5146158 (1992-09-01), Ooike
patent: 5243277 (1993-09-01), Totsuka et al.

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