Shock sensor

Details Shock sensor Shock sensor

1992-12-02

1994-07-05

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6145M, 200 6153, 335205, H01H 3514, H01H 900

Patent

active

053269454

ABSTRACT:
To detect an impact due to a shock with high precision and stability, a shock sensor is employed which provides a sufficiently long closure interval of a contact of a reed switch (1) enough to carry out signal processing. A gap between an outer surface of a magnet (2) and an inner wall (8) of a housing (7) defining a passage for the magnet (2) comprises a first gap (G1) between a stationary position and an activating position and a second gap (G2) between the activating position and a stop position. The inner wall (8) is formed so that the first gap (G1) is greater than the second gap (G2). The velocity of the magnet (2) is lower when travelling in the second gap (G2) than the velocity in the first gap (G1) because air resistance is greater in the second gap (G2). Accordingly, the closure interval is increased. Alternatively, the closure interval of the contact of the reed switch (1) is adjusted by first and second coil springs (3, 49) which independently urge first and second magnets (2, 48) in an anti-impact direction, respectively. To cope with various collision modes, spring constants (k1, k2) of the first and the second coil springs (3, 49) and masses (m1, m2) of the first and the second magnets (2, 48) are selected so that the velocity of shock-responsive movement is different between a first group comprising the first magnet (2) and the first coil spring (3) and a second group comprising the second magnet (48) and the second coil spring (49).

REFERENCES:
patent: 3671892 (1972-06-01), Eaton
patent: 3795780 (1974-03-01), Lawrie
patent: 4705922 (1987-11-01), Seeger et al.
patent: 4792651 (1988-12-01), Whiting
patent: 4877927 (1989-10-01), Reneau
patent: 5212357 (1993-05-01), Reneau

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