Acceleration detector

Details Acceleration detector Acceleration detector

1989-06-09

1990-10-02

Chapman, John

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

310329, G01H 1108

Patent

active

049599933

ABSTRACT:
An acceleration detector comprising transducer including a pair of ring-shaped piezoelectric elements, a terminal having a ring-shaped eye portion for taking out an output from the piezoelectric elements and a weight for applying a stress to the piezoelectric elements in response to an acceleration applied to the detector. The transducer is mounted on a base having a threaded hole by a screw having a threaded portion thread-engaged with the threaded hole of the base. The axial length of the threaded portion of the screw is selected such that its substantially entire length engages the threaded hole in order not to damage an electrically insulating tube placed over the screw by the thread on the screw. The threaded hole in the base may have a counter sink for providing a predetermined dimensional allowance in the relationship between the axial length of the threaded portion and the depth of the thread hole. Also, the terminal may have a bent tab at the outer circumference of the ring-shaped eye portion for engaging the outer circumferential surface of at least one of the piezoelectric elements to prevent the terminal from being displaced relative to the piezoelectric elements.

REFERENCES:
patent: 3487238 (1969-12-01), Angleton et al.
patent: 4225302 (1980-09-01), Suzuki et al.

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