Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-06-01
1979-12-25
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
73594, 340550, G08B 1304
Patent
active
041808118
ABSTRACT:
A detecting device for destructive vibration of structures wherein detected vibration is converted into electric signal and an alarm is actuated when signal amount reaches at least one of a predetermined counting value and integration value is provided. The converted vibration signals are amplified, a high level signal in such amplified signals is detected and amplified by a high level detector, a high level output of this detector is counted by a counter to generate a counter output when the predetermined counting value is reached, a low level signal in the amplified signals is detected and amplified by a low level detector, a low level output of this detector is integrated by an integrating circuit to generate an integration output when the predetermined integration value is reached, and the alarm is actuated whenever at least one of the counter output and integration output is provided.
REFERENCES:
patent: 3391571 (1968-07-01), Johanson
patent: 3585581 (1971-06-01), Aune et al.
patent: 3713128 (1973-01-01), Wong et al.
patent: 3889250 (1975-06-01), Solomon
patent: 3947835 (1976-03-01), Laymon
patent: 4054867 (1977-10-01), Owens
patent: 4088989 (1978-05-01), Solomon
Abiko Toshio
Hanahara Tohru
Matsuoka Kazuhiro
Yoshimura Tadashi
Caldwell Sr. John W.
Matsushita Electric & Works Ltd.
Nowicki Joseph E.
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