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    • 9. 发明授权
    • Swimming pool entrance opening warning device
    • US11354987B2
    • 2022-06-07
    • US15931177
    • 2020-05-13
    • Joseph Y. Ko
    • Joseph Y. Ko
    • G08B13/08G08B21/08
    • A swimming pool entrance opening warning device comprises at least one door magnetic switch, at least one bypass switch and a host, wherein the door magnetic switch is arranged on a door leading to the swimming pool entrance, the bypass switch is arranged on a building structure adjacent to the swimming pool entrance, the bypass switch being provided with a first release button, and the host is arranged on the building structure adjacent to the swimming pool entrance or the door, the host and the bypass switch be located at different positions, the host comprising a host shell, a speaker module arranged on the host shell, a second release button arranged on the host shell, and a control circuit board connected with the first release button and the second release button, while according to the invention, when the door is opened and two release buttons do not generate a release signal after passing a buffering time, the speaker module is actuated through the control circuit board, thereby preventing unauthorized personnel from entering and exiting the swimming pool.