| 摘要 |
<p>A door structure (10) having a blocking element (19) selectively positionable to hold a door (13) in an open disposition relative to an opening (12) in a wall structure (11) to which the door is hingedly mounted. The door holding structure includes a blocking element (19) pivotally mounted at one end to one portion (21) of the wall structure (11) and provided at its distal end (24) with a magnetic element (31). The door (13) carries an electromagnetic device (33) which is selectively energizeable to releasably magnetically hold the plate (31) when desired. Energization of the electromagnetic device coil (40) is controlled by one or more switches (38, 39). One illustrative switch is a proximity switch arranged to be closed as an incident of positioning of a door handle (36) of the door latching mechanism (35). The door holding structure is arranged to swing under gravitational basis to a retracted position providing free passage through the door opening (12) when desired. </p> |
