automatic door bottom

automatic door bottom

[¦ȯd·ə¦mad·ik ′dȯr ‚bäd·əm]
(engineering)
A movable plunger, in the form of a horizontal bar at the bottom of a door, which drops automatically when the door is closed, sealing the threshold and reducing noise transmission. Also known as automatic threshold closer.

automatic door bottom

automatic door bottom
automatic door bottom
A movable plunger, in the form of a horizontal bar at the bottom of a door, which drops automatically when the door is closed; when closed, a horizontal protruding operating rod strikes the door jamb, thereby actuating the plunger, sealing the threshold and reducing noise transmission.
References in periodicals archive ?
Provide and install door hardware seals, automatic door bottom, automatic door closure and electromagnetic door stops so room can maintain required system pressure.
Tested through 5 million cycles, the ZERO Automatic Door Bottom uses a concealed flat spring, which activates when door is closed, lowering neoprene seals against door and saddle.

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