Access device for checking access entitlement to a protected area operates in public and protected areas with ceiling elements and a beam-focussing device

摘要

An area (10) of a building is divided by a checking area (12) into a public area (14) and a protected area (16). A checking section is extended by means of a transverse girder beneath the line (18) of the flooring. A number of ceiling elements (22-28) fasten on a building's ceiling (20). Independent claims are also included for the following: (A) A ceiling element for fastening on a building's ceiling; (B) and for a method for checking access entitlement to a protected area.