Danger alarms

The alarm has a push button (1) with a spring (4). After it is actuated, the button is held in its locked position. After unlocking, the spring returns the button to its ready position. When the button is in its locked position, an electric switch is actuated. The locking position of the button can be unlocked after removing a ring washer (2). The washer holds another switch (25) in its operative state. The washer can only be removed when the button is in its locked position. A cup (24) is fastened on a base plate (5) and guides the button. The washer is releasably connected to the cup. The button is pressed against the washer by the spring. When the button is actuated, a locking spring (8) locks into an opening on the button to hold in its place where the contacts (12) work.