The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 2003
Filed:
Jun. 25, 2001
34160704 Canada Inc., Ile des Soeurs, CA;
Abstract
Resilient attachment members interconnect a pair of flat plates of a movement detector pad and are preferably disposed in the corners of these flat plates. A piezoelectric transducer is disposed centrally between the plates to generate signals when the plates move with respect to one another. In one embodiment the resilient attachment members each have a connector pin which is connected to one of the plates and extends into a pin receiving hollow node formed in the other plates and projecting above an inner surface of the other plate. The end of the connector pin has lateral projections to engage within the node when both plates are spaced apart a predetermined distance by the pressure of helical springs which are disposed about each pin and its associated node. During movement of the pin within the node the pin is in substantially friction free movement whereby not to corrupt the movement signal generated by the piezoelectric crystal. These resilient attachment members interconnect the plates together while providing flexion thereof and which have the effect of maximizing the movement signal to the piezo by reducing the shunt effect that a more rigid corner plate connection has. The resilient members may also be constituted by leaf springs formed integral with one of the plates and connected to the other.