Novel Door Lock Stops Gangsters (Jul, 1934)

Novel Door Lock Stops Gangsters
AN AUTOMATIC electric clock built for revolving doors such as are used in banks and department stores was designed by three Minneapolis inventors to thwart gangster attempts at wholesale robbery.

The device is concealed in the wall just above the axis of the door. In case of a holdup any employee can press the alarm push button. A small electric motor immediately engages notched clutches which prevent the door from turning.

3 comments
  1. Rick Auricchio says: September 21, 20097:51 pm

    Robbers are trapped in the bank until they learn how to break a window.

  2. Stephen says: September 22, 20095:54 am

    Also, I think it’s an “automatic electric lock“, not an “automatic electric clock“!

  3. jayessell says: September 22, 200911:11 am

    Unless it magicly traps one-man gangs inside the door, I don’t see
    why you would want to be locked in a bank with armed and
    desperate desperadoes.

    (Has that happened? Crooks stuck in the non-reversing revolving door
    with the loot just out of reach?)

    Do some modern banks actually have inner and outer door ‘man-traps’?
    Let the ATM deal with the robbers!

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