Electricity: circuit makers and breakers – Special application – Change of inclination or of rate of motion responsive
Patent
1990-08-09
1993-09-28
Hoff, Marc S.
Electricity: circuit makers and breakers
Special application
Change of inclination or of rate of motion responsive
200 6145R, H01H 3502
Patent
active
052488616
ABSTRACT:
An acceleration sensor is disclosed, which comprises a movable permanent magnet, a case of a non-magnetic material having a space with the movable permanent magnet movable therein, a magnetic yoke provided on the case and extending in a direction crossing the directions of movement of the movable permanent magnet, and a lead switch for forming a closed magnetic circuit together with the movable permanent magnet and magnetic yoke, the lead switch being turned on and off with a movement of the movable permanent magnet caused due to an acceleration produced by shocks or vibrations.
Another acceleration sensor is disclosed, which is operable in response to a predetermined acceleration to open a first magnetic circuit with a permanent magnet and close a second magnetic circuit with the permanent magnet so as to close a lead switch and comprises a movable magnetic member held stationary in the first magnetic circuit and moved in response to a predetermined acceleration in a direction crossing and to close the first magnetic circuit.
REFERENCES:
patent: 3250871 (1966-10-01), Wigger
patent: 3459911 (1969-08-01), Fischer
patent: 3560846 (1971-02-01), Bessko
patent: 3942051 (1976-03-01), Stevinson et al.
patent: 4591676 (1986-05-01), Jackman et al.
patent: 4948929 (1990-08-01), Fukushima
patent: 5028750 (1991-07-01), Spies et al.
Hatakeyama Manabu
Kato Tomio
Friedhofer Michael A.
Hoff Marc S.
TDK Corporation
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