| 摘要 |
Disclosed is apparatus for use with: an RFID proximity card; a frame including a pair of jambs; a door hingedly connected to one of the jambs, the other being hollow and having a rabbet defined by a pair of surfaces, one surface presenting to the closed door and defining part of a stop against which the door is positioned when closed and the other surface flanking and presenting towards the door edge when closed . The other surface width is in the direction which defines the one jamb depth. The one jamb thickness is in the direction which defines the doorway width. The apparatus comprises a sensor which: produces a signal when the card is presented thereto; and has thickness T, width W and height H . T < [thickness of other jamb - thickness of stop]. W is equivalent to the width of other surface. H < doorway height. |
