Light barrier, particularly for automatically actuated lift cabin doors
First Claim
1. A light barrier arrangement for controlling the automatic actuation of two cabin doors of a lift, said light barrier arrangement comprising:
- at least one respective light receiver connected to each lift cabin door and arranged to be displaced together with the related cabin door;
at least one respective light emitter operatively associated with each light receiver;
each said light emitter being mounted displaceably in a door sill and each said light receiver, in a predetermined position of the related cabin door, being located vertically above the related light emitter;
each cabin door being provided with an entrainment element for entraining the related light emitter during the movement of such cabin door; and
cleaning means provided at a bottom edge of each cabin door, so that the region of the door sill through which passes the light emitted from the light emitters is cleaned during each of the opening and closing movements of the cabin doors.
1 Assignment
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Accused Products
Abstract
A light barrier is restricted to detecting blockage in a limited, constant region before the closing edges of a lift cabin-twin door. Two light emitters or transmitters are displaceably arranged in the door sill and are operatively associated with entrainment elements fastened to the lift cabin doors. The light emitters are synchronously displaced with light receivers mounted at the upper edges of the cabin doors. To increase reliability of operation, the lower edges of the lift cabin doors are provided with cleaning devices which clean the light exit locations of infrared luminescent or light-emitting diodes forming the light emitters during every opening and closing operation. Thus, the cleaning device of one door is arranged to clean the infrared luminescent diode of the light emitter of the other door and vice versa.
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Citations
6 Claims
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1. A light barrier arrangement for controlling the automatic actuation of two cabin doors of a lift, said light barrier arrangement comprising:
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at least one respective light receiver connected to each lift cabin door and arranged to be displaced together with the related cabin door; at least one respective light emitter operatively associated with each light receiver; each said light emitter being mounted displaceably in a door sill and each said light receiver, in a predetermined position of the related cabin door, being located vertically above the related light emitter; each cabin door being provided with an entrainment element for entraining the related light emitter during the movement of such cabin door; and cleaning means provided at a bottom edge of each cabin door, so that the region of the door sill through which passes the light emitted from the light emitters is cleaned during each of the opening and closing movements of the cabin doors. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification