Patent ID: 6012252
Filing Date: 2000-01-11
Classification: E06B,G07C

Abstract:
A turning blocking device including a passageway, the blocking device for blocking a user from passing through said passageway,comprising:a housing enclosing a drive shaft connected to a drive motor,a rotatable blocking element connected to said drive shaft, said blocking element having one and only one barrier arm, which blocks said passageway and prevents the user from passing through said passageway when in a first blocking position when said housing is mounted beside said passageway,an optical sensor element mounted on said housing, said optical sensor element sensing changes in light, when the user passes through said passageway by sensing changes in a light detection range projected in a path of travel reached by the user after passing beyond said blocking position of said barrier arm, said barrier arm being turned in one direction from said blocking position into an intermediate position remote of said passageway in order to allow passage of the user, said barrier arm being turned further, after detection of the user passing through said light detection range projected in the path of travel, by said optical sensor activating said drive motor after passage of the user through said light detection range projected in the path of travel so that said blocking arm rotates in the same direction to a second blocking position.