Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Eccentrically pivoted coil
Patent
1975-12-19
1977-04-19
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Eccentrically pivoted coil
324154R, G01R 508, G01R 102
Patent
active
040191370
ABSTRACT:
A long-scale moving coil instrument of the type comprising a frame, means including an arcuate core member secured to the frame for forming a magnetic circuit path, and a mounting member carrying a moving coil over the core member and being suspended for rotation relative to the frame by means of tension bands secured to bosses on the mounting member. The instrument is characterized by a pair of boss-stoppers made of an elastic, electrically insulating material. Each boss-stopper supports a tension spring, lies in a through-hole provided in the frame, and has a central passage through which the tension bands extend for connection to the tension springs, the passages additionally receiving the bosses on the coil mounting member to limit movement thereof. With this arrangement, electrical connections to the moving coil may be effected by means of the tension bands while maintaining the electrical connections isolated from the frame with the electrically insulating boss-stoppers. The boss-stoppers are press-fitted into the through-holes, and thus may be accurately aligned and dimensionally stable. The bosses on the mounting member are formed integrally therewith for added dimensional stability. In addition, the moving coil and pointer are diametrically opposite to one another and the pointer carries an adjustable counterbalancing weight which may be light and still sufficient to provide counterbalance, so that the weight of the whole moving element can be reduced to improve the dynamic characteristics of the instrument.
REFERENCES:
patent: 3277370 (1966-10-01), Clark
patent: 3317837 (1967-05-01), Takeda et al.
patent: 3551812 (1970-12-01), Mothes
patent: 3597686 (1971-08-01), Kain et al.
patent: 3681692 (1972-08-01), Haas et al.
patent: 3878462 (1975-04-01), Orth et al.
Sugawara Yutaka
Takeda Shoji
Strecker Gerard R.
Yokogawa Electric Works, Ltd.
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