公开(公告)号：US20230326326A1

公开(公告)日：2023-10-12

申请号：US18043924

申请日：2021-08-30

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Matthew Shannon ,  Wesley M. Barbee ,  Craig M. Parkulo ,  Ronnie G. Durham ,  Michael R. Oliva ,  Paul M. Rathke ,  Brian Minier

IPC: G08B25/01 ,  G08B21/04

CPC classification number: G08B25/016 ,  G08B21/0438

Abstract: A safety circuit for a Personal Alert Safety System (PASS) device includes a safety logic circuit and an alarm circuit. The safety logic circuit is communicably coupled to the PASS device. The safety logic circuit includes a timer configured to determine a time elapsed since the timer has been last reset. The safety logic circuit is configured to switch from an off state to an on state upon receiving an activation signal from the PASS device and reset the timer upon switching to the on state, generate a trigger signal in response to the timer exceeding a time threshold, and reset the timer upon receiving a reset signal from the PASS device before the timer exceeds the time threshold. The alarm circuit is communicably coupled to the safety logic circuit and configured to generate an alarm signal upon receiving the trigger signal from the safety logic circuit.