Device allowing a door to be held open in a location equipped with closing equipment as in a public block of flats but having means to ensure the door is closed after a timer has run out

摘要

Plate (8) on which the supply circuit is fixed is recessed in the ground. The plate has an additional cushioning spring (9) that is steel, rubber or pneumatic or a combination. The power supply circuit (6,7) to this spring is also connected to the timer switch for the door so that when a preset time has elapsed, the door is automatically closed by a light traction force before loss of power.