Safety switch for monitoring a closed position of two parts moveable relative to one another
First Claim
1. A safety switch for monitoring a closed position of a guard door in an automated installation, said guard door comprising a fixed part and a moveable part, and the safety switch comprising:
- an actuator and a sensor each adapted to be secured to one of the parts,wherein the actuator has a transponder including an actuator antenna and the sensor has a sensor antenna,wherein the antennas are configured to establish a transponder coupling, when the parts are in the closed position,wherein the sensor antenna has a magnetic directional characteristic which allows the transponder coupling in at least two spatial directions that are mutually perpendicular as seen from the sensor antenna, and furtherwherein the magnetic directional characteristic comprises a stronger first preferential direction and a weaker second preferential direction allowing the transponder coupling, wherein the sensor antenna is arranged in an antenna housing having housing walls, and wherein a distance between the sensor antenna and the housing walls in the first preferential direction is longer than in the second preferential direction.
1 Assignment
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Accused Products
Abstract
A safety switch, which is particularly intended for monitoring a guard door on an automated installation, has an actuator and a sensor. The actuator comprises an actuator antenna and the sensor comprises a sensor antenna. The actuator and the sensor are coupled to one another like a transformer, in particular like a transponder, when the guard door is in the closed position. According to one aspect of the invention, the sensor antenna has a magnetic directional characteristic which allows transformer coupling with the actuator in at least two mutually perpendicular spatial directions as seen from the sensor antenna.
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Citations
21 Claims
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1. A safety switch for monitoring a closed position of a guard door in an automated installation, said guard door comprising a fixed part and a moveable part, and the safety switch comprising:
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an actuator and a sensor each adapted to be secured to one of the parts, wherein the actuator has a transponder including an actuator antenna and the sensor has a sensor antenna, wherein the antennas are configured to establish a transponder coupling, when the parts are in the closed position, wherein the sensor antenna has a magnetic directional characteristic which allows the transponder coupling in at least two spatial directions that are mutually perpendicular as seen from the sensor antenna, and further wherein the magnetic directional characteristic comprises a stronger first preferential direction and a weaker second preferential direction allowing the transponder coupling, wherein the sensor antenna is arranged in an antenna housing having housing walls, and wherein a distance between the sensor antenna and the housing walls in the first preferential direction is longer than in the second preferential direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A safety switch for monitoring an adjacent position of two parts which are moveable relative to one another, comprising:
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an actuator and a sensor each adapted to be secured to one of the parts, wherein the actuator has an actuator antenna and the sensor has a sensor antenna, wherein the antennas are configured to establish a defined transformer coupling, when the parts are in the adjacent position, wherein the sensor antenna has a magnetic directional characteristic which allows the defined transformer coupling in at least two spatial directions that are mutually perpendicular as seen from the sensor antenna, and further wherein the directional characteristic comprises a stronger first preferential direction and a weaker second preferential direction allowing the transformer coupling, wherein the sensor antenna is arranged in an antenna housing having housing walls, and wherein a distance between the sensor antenna and the housing walls in the first preferential direction is longer than in the second preferential direction. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification