Electronic security seal device

一模制的透明热塑材料外壳，其具有一可编程的发送电路，用于将封口装置识别序列号、封口装置位置、集装箱识别信息和其它数据发送给当地接收器。在外壳中有一个能够接触到该电路的门，以便编制所发送的封口装置的指标和相关的数据。一触点装置构成开关，根据锁定螺栓插入外壳的锁定机构，通过该螺栓施加电源，使数据发生电路处于工作状态。沿柄杆布置的导体连接到该电路，当螺栓折断时给该电路提供一个明显的损坏信号。该电路感测到螺栓的取出或螺栓损坏的状态，产生"损坏"信号，发送到当地的接收器/读取器。螺栓处的导体可以是环绕柄杆的塑料管中的导线，在柄杆的绝缘层上的导电层和导电的螺栓头部，与头部或中空金属管内的导线欧姆接触。切断螺栓就切断了导线或头部和涂层间的欧姆接触，或头部和管内导线之间的欧姆接触，表明出现损坏。该封口装置在随机的时间间隔内周期地发送封口装置状态、是否正常或损坏。在另一个实施例中，一询问装置可询问该封口装置，然后后者根据螺栓的锁定或损坏状态发送其锁定或损坏的状态信号。 A molded transparent thermoplastic housing has a programmable transmitting circuit for transmitting seal identifying serial number, seal location, container identification and other data to a local receiver. A door in the housing permits access to the circuit for programming the seal indicia and related data for transmission. A contact arrangement forms a switch upon insertion of a locking bolt into a locking mechanism in the housing and applies battery power through the bolt to activate the data generating circuit. A conductor along the bolt shank is connected to the circuit provides a tamper evident signal to the circuit when the bolt is severed. The circuit senses the removal of the bolt or severed bolt condition for generating a "tamper" signal which is transmitted to a local receiver/reader. The conductor at the bolt may be a wire in a plastic tube surrounding the shank, a conductive layer over an insulation layer on the shank and over the conductive bolt head in ohmic contact with the head or a wire in a hollow metal tube. Severing the bolt severs the wire or the ohmic contact between the head and coating or between the head and the wire in the tube to indicate tampering. The seal periodically in random periods transmits the seal condition, whether normal or tampered. In an alternative embodiment, an interrogation unit may interrogate the seal which then transmits its locked or tampered states according to the locked or tampered condition of the bolt.