Дверной звонок

Дверной звонок 1884 года в доме на проспекте Андраши (Будапешт)
Украшенный дверной звонок в Венеции
Классический звук дверного звонка

Дверной звонок — устройство для оповещения о намерении о визите в помещение, которое находится возле входной двери. Когда находящийся у двери нажимает кнопку звонка, подаётся звуковой сигнал, и находящийся в помещении идёт смотреть в глазок или приоткрывать дверь на цепи и принимать решение, впустить ли этого человека или нет. Иногда используется световой сигнал — совместно со звуковым или вместо него.

История

Первые дверные звонки были механическими. Уильям Мердок, шотландский изобретатель, построил дом в Бирмингеме в 1817 году и установил там все свои изобретения. Среди них — механический дверной звонок (колокол).[источник не указан 880 дней] К началу 1900-х годов дверными звонками пользовались все.

Первые дверные звонки

К началу 1900-х годов появились звонки с ручкой. Ручку крутили, и звонок звонил. Такие звонки до сих пор используют для декорирования.

Электромеханический звонок состоял из кнопки и резонатора. При нажатии на кнопку раскручивается катушка, она передаёт силы на пластину, и звонок начинает звонить[прояснить].

Проводные дверные звонки

Проводные дверные электрические звонки обычно работают от обычной сети переменного тока. У них есть две группы контактов: непосредственно от электрической сети и к кнопке. Такие звонки очень дëшевы и просты, к тому же, использование переменного тока позволило отказаться от прерывателя.

Классический советский дверной звонок, широко распространённый странах бывшего СССР и встречающийся даже в наши дни. Одна пара проводов соединяется непосредственно с сетью, вторая — с кнопкой
Классическая советская кнопка дверного звонка, широко распространённая в странах бывшего СССР. Имеет практически любую расцветку корпуса и собственно кнопки

Беспроводные дверные звонки

Беспроводной дверной звонок с сенсорной кнопкой

Беспроводные звонки чаще всего работают от батареек. Расстояние между кнопкой и корпусом должно быть не более 100 метров[источник не указан 2497 дней]. Должно быть меньше преград на пути от корпуса до кнопки.

Литература

  • Звонки дверные механические // Товарный словарь / И. А. Пугачёв (главный редактор). — М.: Государственное издательство торговой литературы, 1957. — Т. II. — Стб. 935—936. — 567 с.

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