Patent ID: 7034929
Filing Date: 2006-04-25
Classification: B21D,F16P,G01V

Abstract:
1. A protective apparatus for securing to a component movable along a track (B) and for the monitoring of a protected zone to be moved with the component, the protective apparatus comprising a light transmitter for the radiation of a divergent transmitted light beam into a spatial zone containing the protected zone; a light receiver for the reception of at least some of the light of the transmitted light beam of the light transmitter radiated into the spatial zone and for the emitting of corresponding reception signals; a restriction device which is arranged in the direction of a transmitted light path after a section of the transmitted light path which contains the protected zone and by means of which the transmitted light beam can be restricted to a less divergent received light beam determining the width of the protected zone in at least one direction; and wherein an aperture angle of the transmitted light beam is selected such that a width of the transmitted light beam directly at the restriction device is larger in a pre-determined direction orthogonal to the transmitted light path directly in front of the restriction device than a mean amplitude of movement of the transmitted light beam to be expected directly at the restriction device and caused by a relative movement of the light transmitter and the restriction device.