Automatic doors open with little effort to its user. The user of a regular door would normally have to push of pull it open with their hands, but an automatic door just requires the activation of some sort of sensor. Sensors for automatic doors are generally pressure sensors or light sensors.
Heron of Alexandria created the first automatic door.
Automaticdoor openers will be as common a home modification and accessibility aid as a lift, ramp, or elevator are to the physically challenged who use a wheelchair, scooter, cane or walker.
Door openers sometimes called automaticdoor openers, or automaticdoor openers are the trend 2000.
The automaticdoor opener is to the disabled community and the user of scooter, walker, wheelchair, lift, elevator and ramp what the electric door opener is to owners of automobiles.
Door closing means have already been proposed in which spring energy accumulated in a spring member is released to close the sliding door, utilizing various types of buffer mechanisms to regulate the closing speed of the door.
The automaticdoor closing device 27 is attached to sliding door 20 with the end of cable 9 attached to a hook on door frame 24 as shown in FIG.
The mounting of the automaticdoor closing device 27 is such that when sliding door 20 is in the closed position there is sufficient tension in the spring 10 holding sliding door 20 in the closed position.
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