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An automatic door, also known as an auto door, is a door that opens automatically, without the need for human intervention or usually upon sensing the approach of a person. A person can be detected by microwave pulses, infrared sensors , or pressure-sensing pads.
Swing side, door mounted sensor—mounted on the swing side of the door itself, used as the door is opening to detect a user in the way of the opening door. In that case, the operator stops the door. The sensitivity of infrared sensors must be reduced at the end of the opening angle, if it starts seeing a wall next to the door, so it may not ...
The operator is placed in the space above the sliding door. An electric motor, geared down to get a lower speed and a higher torque, drives a pulley at one end of a belt. The door is clamped to the belt. To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs.
Key: *a) head rope *f) loop of the sheet bend being tied *n) netting shuttle *s) gauge *z) tongue of the netting shuttle (makes it easier to load the twine so that it does not twist as it is used) Mending a net; binding a length of net to a new head rope. Note that, unusually, the gauge of the row being worked is larger than the gauge of the ...
Markus Alexej Persson was born in Stockholm, Sweden, to a Finnish mother, Ritva, [2] and a Swedish father, Birger, [3] on 1 June 1979. [4] [5] [2] He has one sister.[2] [6] He grew up in Edsbyn until he was seven years old, when his family moved back to Stockholm.
Aston Villa - ninth, need to win and hope results go their way to make last 16, but guaranteed at least a play-off place. Celtic - 18th, guaranteed to be in at least play-offs, but unlikely to ...
A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]
A door is an example of a complex feature that is seemingly trivial to implement correctly. In the original description of the analogy, Liz England justifies and explains the job requirements of a designer and how complex the job actually is compared to how the requirements are initially posed (making a door). She uses the idea of implementing ...