公开(公告)号：US3662342A

公开(公告)日：1972-05-09

申请号：US3662342D

申请日：1971-02-16

Applicant: PHINIZY R B

Inventor： HEDIN ROBERT A ,  PANTAS LEO J

IPC: G07C9/00 ,  G08B13/08 ,  H04Q9/00

CPC classification number: G07C9/00706 ,  G07C9/00904

Abstract: A key-actuated electronic security system having first and second keys each constituted by a plurality of circuit paths in a pattern of closed and open circuits. The system includes comparing means which electrically compares respective ones of the circuit paths of the keys and which delivers an output signal when there is a predetermined correspondence between respective ones of the circuit paths of the keys. In an embodiment employing a NAND gate, the correspondence is constituted by a complementary relationship and in an embodiment employing Exclusive-OR gates, the correspondence may be constituted by either a complementary or an identical relationship. The system includes means, e.g., a latch, responsive to the output signal for indicating the predetermined correspondence. One of the keys is readily changeable to modify its circuit pattern so that there will not be the predetermined correspondence whereby the changed key will be inoperative to cause the comparing means to deliver an output signal and thus requiring the use of a third key having circuit paths providing a predetermined correspondence with the circuit paths of the changed key in order to cause the comparing means to deliver an output signal. Disclosed also is a key-actuated security system including a plurality of remote stations and a central control station. Each of the remote stations is adapted to provide electrical interconnection with one of the keys. The central station is adapted to receive a plurality of keys, each one of these keys corresponding to one of the remote stations. Key comparing means delivers an output signal when there is a predetermined correspondence between respective ones of the circuit paths of the key received at the remote station and of a particular one of the keys of the first set received at the central control, this output signal being transmitted to the remote station for operating a latch.

Abstract translation: 一种具有第一和第二键的钥匙致动的电子安全系统，每个钥匙由多个电路路径以闭合和断路模式构成。 该系统包括比较装置，其电键比较键的电路路径中的各个电路路径，并且当在键的相应电路路径之间存在预定的对应关系时传送输出信号。 在采用NAND门的实施例中，对应关系由互补关系构成，并且在采用异或门的实施例中，对应关系可以由互补或相同关系构成。 该系统包括响应于输出信号指示预定对应关系的装置，例如锁存器。 其中一个键易于改变以修改其电路图案，使得不存在预定的对应关系，由此改变的键将不起作用，以使比较装置传送输出信号，因此需要使用具有电路路径的第三键 提供与改变的键的电路路径的预定对应关系，以便使比较装置传递输出信号。