Electricity: circuit makers and breakers – Special application – Change of inclination or of rate of motion responsive
Patent
1999-07-13
2000-02-22
Friedhofer, Michael
Electricity: circuit makers and breakers
Special application
Change of inclination or of rate of motion responsive
H01H 3514
Patent
active
060282754
ABSTRACT:
A tilt switch includes an insulating switch body with top and bottom walls and an inner circumferential wall surrounding an upright central axis. An upright electric contact member is secured to the top wall, and extends along the central axis to form a first electric contact terminal outwardly of the bottom wall. An annular electric contact member engages the inner circumferential wall, and has an inner peripheral wall, and an annular rolling surface forming with the inner peripheral wall at the juncture thereof an annular edge. A second electric contact terminal is integrally formed with the annular electric contact member, and extends downwardly and outwardly of the bottom wall. An electrically conductive ball member is disposed in the insulating switch body such that when the annular rolling surface remains in a horizontal plane, the ball member will be retained between the upright electric contact member and the annular edge to establish an electrical connection between the first and second electric contact terminals. Once the annular rolling surface is tilted from the horizontal plane, the change of gravity will move the ball member over the annular edge and away from the upright electric contact member so as to break the electrical connection.
REFERENCES:
patent: 3509298 (1970-04-01), Kirk
patent: 3706867 (1972-12-01), Rand et al.
patent: 3927286 (1975-12-01), Fohl
patent: 4628160 (1986-12-01), Canevari
patent: 4833281 (1989-05-01), Maples
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