FR2414229A1 - Object displacement detector for e.g. museum piece - uses piezoelectric element which has damped pendulum movement - Google Patents

Object displacement detector for e.g. museum piece - uses piezoelectric element which has damped pendulum movement

Info

Publication number
FR2414229A1
FR2414229A1 FR7800102A FR7800102A FR2414229A1 FR 2414229 A1 FR2414229 A1 FR 2414229A1 FR 7800102 A FR7800102 A FR 7800102A FR 7800102 A FR7800102 A FR 7800102A FR 2414229 A1 FR2414229 A1 FR 2414229A1
Authority
FR
France
Prior art keywords
piezoelectric element
detector
displacement detector
pendulum movement
object displacement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR7800102A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR7800102A priority Critical patent/FR2414229A1/en
Publication of FR2414229A1 publication Critical patent/FR2414229A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1436—Mechanical actuation by lifting or attempted removal of hand-portable articles with motion detection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gyroscopes (AREA)

Abstract

The object movement detector includes a pendulum type displacement system associated with an amplitude limiting damping element. An amplifier is provided for signals generated by the detector. The pendulum part of the detector has a piezoelectric element(1), one end of which is fixed. The free end of the piezoelectric element is associated with a fixed inertial mass. The inertial mass is amplitude damped for pendulum displacements by a honeycombed plastic material crown(4) surrounding it. The exterior surface of the plastic material crown is in permanent contact with the interior surface of a tubular body(9) which forms the rigid and protective support for the detector.
FR7800102A 1978-01-04 1978-01-04 Object displacement detector for e.g. museum piece - uses piezoelectric element which has damped pendulum movement Withdrawn FR2414229A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7800102A FR2414229A1 (en) 1978-01-04 1978-01-04 Object displacement detector for e.g. museum piece - uses piezoelectric element which has damped pendulum movement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7800102A FR2414229A1 (en) 1978-01-04 1978-01-04 Object displacement detector for e.g. museum piece - uses piezoelectric element which has damped pendulum movement

Publications (1)

Publication Number Publication Date
FR2414229A1 true FR2414229A1 (en) 1979-08-03

Family

ID=9203099

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7800102A Withdrawn FR2414229A1 (en) 1978-01-04 1978-01-04 Object displacement detector for e.g. museum piece - uses piezoelectric element which has damped pendulum movement

Country Status (1)

Country Link
FR (1) FR2414229A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556538A1 (en) * 1983-12-12 1985-06-14 Lehir Jean Pierre Handset of telephone set
EP0172301A1 (en) * 1984-04-03 1986-02-26 DELTA ELETTRONICA s.p.a. Device for detecting changes of the inclinations of a body

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582692A (en) * 1968-05-01 1971-06-01 U S Research Corp Resiliently supported sensing transducer
US3665259A (en) * 1970-08-19 1972-05-23 Harrison D Brailsford Vibration transducer for burglar alarms and the like
DE2254540A1 (en) * 1972-11-08 1974-05-09 Wilhelm Karger VIBRATION DETECTORS FOR QUIET POWER SYSTEMS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582692A (en) * 1968-05-01 1971-06-01 U S Research Corp Resiliently supported sensing transducer
US3665259A (en) * 1970-08-19 1972-05-23 Harrison D Brailsford Vibration transducer for burglar alarms and the like
DE2254540A1 (en) * 1972-11-08 1974-05-09 Wilhelm Karger VIBRATION DETECTORS FOR QUIET POWER SYSTEMS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556538A1 (en) * 1983-12-12 1985-06-14 Lehir Jean Pierre Handset of telephone set
EP0172301A1 (en) * 1984-04-03 1986-02-26 DELTA ELETTRONICA s.p.a. Device for detecting changes of the inclinations of a body

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Legal Events

Date Code Title Description
ST Notification of lapse