A calibration system having an actuator with a rotatable shaft and a switch box housing a proximity switch and a calibration mechanism. The calibration mechanism is coupled to the shaft and includes a base, a target carrier, a driver, and an actuating button having a cam. The base includes a locatin
A calibration system having an actuator with a rotatable shaft and a switch box housing a proximity switch and a calibration mechanism. The calibration mechanism is coupled to the shaft and includes a base, a target carrier, a driver, and an actuating button having a cam. The base includes a locating magnet, and the target carrier includes a primary magnet and a bias magnet polarized in the same direction as the locating magnet. The driver is shiftable between a first position in which the driver engages the target carrier and a second position disengaged from the target carrier. The cam engages the driver and shifts the driver between the first and second positions. Upon rotation of the shaft, the bias magnet automatically moves to a position aligned with the locating magnet when the driver is in the second position.
대표청구항▼
1. A calibration system for calibrating a proximity switch coupled to a process control device, the calibration system comprising: an actuator operatively coupled to the process control device and having a rotatable shaft;a switch box housing the proximity switch and coupled to the actuator, the rot
1. A calibration system for calibrating a proximity switch coupled to a process control device, the calibration system comprising: an actuator operatively coupled to the process control device and having a rotatable shaft;a switch box housing the proximity switch and coupled to the actuator, the rotatable shaft extending into the switch box adjacent the proximity switch;a calibration mechanism coupled to the shaft, the calibration mechanism including a base, a target carrier, a driver, and an actuating button having a cam;the base rotationally fixed to the shaft and including a locating magnet and a ring magnet;the target carrier coupled to the shaft and disposed adjacent the base, the target carrier having a primary magnet and a bias magnet, the primary magnet and the bias magnet polarized in the same direction as the locating magnet and the ring magnet of the base;the driver slidably coupled to the shaft and rotationally fixed to the shaft, the driver shiftable between a first position in which the driver engages the target carrier to rotationally fix the target carrier to the shaft, and a second position disengaged from the target carrier to permit the target carrier to rotate relative to the shaft; andthe cam operatively coupling the actuating button to the driver and arranged to shift the driver between the first position and the second position;wherein upon rotation of the shaft, the bias magnet is movable about an axis of the shaft relative to the locating magnet when the driver is in the first position, and wherein the bias magnet automatically moves to a position aligned with the locating magnet when the driver is in the second position. 2. The calibration system of claim 1, wherein the base includes at least one projection, and the actuating button includes at least one guide arranged to receive the at least one projection of the base, such that the actuating button is slidably mounted to the base, and wherein the cam includes at least one pathway for engaging a collar disposed on the driver. 3. The calibration system of claim 2, wherein actuation of the actuating button allows the bias magnet to move from an unaligned position, in which the bias magnet is not aligned with the locating magnet, to an aligned position, in which the bias magnet is aligned with the locating magnet and the proximity switch is calibrated. 4. The calibration system of claim 1, wherein the target carrier and the driver are rotationally fixed to one another by a splined connection when the driver is in the first position. 5. The calibration system of claim 2, wherein the actuating button is coupled to the driver by the collar, the collar having at least one arm that engages the pathway of the cam to disengage the driver from the target carrier, and the actuating button has a spring that biases the actuating button toward an undepressed position, such that after actuation, the actuating button automatically moves back to the undepressed position and the driver reengages the target carrier. 6. The calibration system of claim 5, the cam further comprising an end with an inner surface and an outer surface and a cylindrical portion extending from the inner surface, the cylindrical portion having the spring for biasing the actuating button toward the undepressed position. 7. A calibration mechanism for a proximity switch disposed within a switch box, the switch box operatively coupled to an actuator having a shaft, the calibration mechanism comprising: a base adapted to be rotationally fixed to the shaft and including a locating magnet;a target carrier adapted to be coupled to the shaft and disposed adjacent the base, the target carrier having a primary magnet and a bias magnet, the primary magnet and the bias magnet polarized in the same direction as the locating magnet;a driver adapted to be slidably coupled to the shaft and rotationally fixed to the shaft, the driver shiftable between a first position in which the driver engages the target carrier, and a second position disengaged from the target carrier to permit the target carrier to rotate relative to the shaft; andan actuating button having a cam operatively coupling the actuating button to the driver and arranged to shift the driver between the first position and the second position;wherein upon rotation of the shaft, the bias magnet is movable about an axis of the shaft relative to the locating magnet when the driver is in the first position, and wherein the bias magnet automatically moves to a position aligned with the locating magnet when the driver is in the second position. 8. The mechanism of claim 7, wherein the driver is adapted to be coupled to the shaft by a pin-in-slot connection. 9. The mechanism of claim 8, wherein a plurality of c-clips limits sliding movement of the base, the driver, and the cam along the shaft. 10. The mechanism of claim 7, wherein base includes at least one projection, and the actuating button includes at least one guide, such that the actuating button is slidably mounted to the base, and wherein the cam includes at least one pathway for engaging a collar disposed on the driver. 11. The mechanism of claim 10, wherein actuation of the actuating button allows the bias magnet to move from an unaligned position, in which the bias magnet is not aligned with the locating magnet, to an aligned position, in which the bias magnet is aligned with the locating magnet and the proximity switch is calibrated. 12. The mechanism of claim 10, wherein the actuating button is coupled to the driver by the collar, the collar having at least one arm that engages the at least one pathway of the cam to disengage the driver from the target carrier, and the actuating button has a spring that biases the actuating button toward an undepressed position. 13. The mechanism of claim 11, wherein in the aligned position the primary magnet is aligned with the proximity switch, and in the unaligned position, the primary magnet is not aligned with the proximity switch. 14. The mechanism of claim 12, wherein when the actuating button moves back to the undepressed position, the collar to moves out of the at least one pathway in the cam, allowing the driver to move back into the target carrier, and reengaging the driver with the target carrier. 15. The mechanism of claim 12, the cam further comprising an end with an inner surface and an outer surface and a cylindrical portion extending from the inner surface, the cylindrical portion having the spring for biasing the actuating button toward the undepressed position. 16. A method of calibrating a proximity switch of a switch box operatively connected to an actuator having a shaft, the method comprising: attaching a base of a calibration mechanism to a target carrier of the calibration mechanism, the base having a ring magnet and a locating magnet polarized in the same direction, and the target carrier having a primary magnet and a bias magnet polarized in the same direction as the ring and locating magnets and rotatable about the shaft;engaging a driver of the calibration mechanism with the target carrier, the driver rotatable about the shaft when engaged with the target carrier;actuating an actuating button of a calibration mechanism to a depressed position;disengaging a driver of the calibration mechanism from a target carrier of the calibration mechanism,allowing the primary magnet of the target carrier to move back to a position in which the primary magnet is aligned with the proximity switch via the magnets;returning the actuating button to an undepressed position; andreengaging the driver with the target carrier. 17. The method of claim 16, wherein disengaging the driver of the calibration mechanism from the target carrier further comprises engaging a collar disposed on the driver with a pathway of a cam of the actuating button. 18. The method of claim 16, wherein reengaging the driver with the target carrier further comprises moving a collar disposed on the driver out of a pathway of a cam of the actuating button. 19. The method of claim 16, wherein reengaging the driver with the target carrier further comprises constraining the driver to the target carrier via a spline path of each of the driver and the target carrier when the actuating button is in the undepressed position. 20. The method of claim 16, further comprising constraining the driver to the shaft via a pin-in-slot connection. 21. The method of claim 16, further comprising automatically moving the bias magnet into alignment with the locating magnet when the driver is disengaged from the target carrier.
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이 특허에 인용된 특허 (1)
Daniels, James R., Self setting and stabilized switch target.
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