JP2015510245A - Magnetic trigger type proximity switch - Google Patents

Abstract

The magnetic trigger proximity switch includes a cylindrical switch body and an urging member fixed in the switch body so as not to move. The proximity switch also includes first and second normally closed contacts and first and second normally open contacts. The proximity switch further includes a spherical contact magnet disposed within the switch body, the contact magnet being movable relative to the biasing member from the first switch position to the second switch position. In the first switch position, the attractive force on the biasing member maintains the contact magnet in contact with the first and second normally closed contacts, thereby causing the first normally closed contact and the second normally closed contact. Complete the circuit between. At the second switch position, the attractive force on the movable target outside the switch body moves the contact magnet into contact with the first and second normally open contacts, thereby causing the first normally open contact and the second Complete the circuit between the normally open contacts. [Selection] Figure 7A

Description

  The present disclosure relates generally to proximity switches, and more specifically to small magnetic trigger proximity switches.

  Magnetic proximity switches, also known as limit switches, are commonly used for linear position sensing. Typically, a magnetic trigger proximity switch includes a sensor that is adapted to detect the presence of a target without physically touching the target. Typically, the sensor may include a switching circuit mechanism enclosed within the switch body, the switching circuit mechanism typically being a plurality of biased to a first position by one or more springs. Includes levers and contacts. When a target, typically including a permanent magnet contained within the housing, passes within a predetermined range of the sensor, the magnetic flux generated by the target triggers the switching circuit mechanism, thereby closing the normally open circuit. The closure of the normally open circuit is detected by the processor and a signal is sent to an operator or automated operating system to indicate the presence of a target within a predetermined range of the sensor. The target is typically fixed to a displaceable element of the system, such as a valve stem, and the sensor is typically fixed to a fixed element of the system, such as a valve body. When so configured, the sensor can detect when a displaceable element has changed position. However, due to the relatively large physical size of the sensor required to encapsulate the switching circuitry, typical sensors are used in applications that require installation of the sensor in areas with limited free space. I can't. In addition, the need to supply power to the sensor also limits the applications in which the sensor can be used.

  Although a relatively small magnetic trigger proximity switch may be desirable, the ability to reduce the size of the proximity switch may be limited by several factors. Specifically, in addition to a programmable logic controller ("PLC") level load of about 5V, when a relatively high load value is required, the larger contact accordingly accommodates the larger load. These large contacts limit the ability to reduce the size of the switch. In addition, as explained above, there are many components located within the switch housing and the relatively complex actuation assembly size limits the minimum size of the switch. Such complex actuation assemblies also add to the proximity switch manufacturing time and cost.

  In accordance with an exemplary aspect of the present invention, a magnetic trigger proximity switch includes a switch body and a first magnet that is immovably secured within the switch body. A common arm having a first end and a second end is also included, the second end being disposed within the switch body. The proximity switch also includes a primary arm having a first end and a second end. The second end is disposed within the switch body and the second end includes a primary contact. In addition, the proximity switch includes a secondary arm having a first end and a second end. The second end is disposed within the switch body and the second end also includes a secondary contact. The proximity switch also includes a cross arm disposed within the switch body. The cross arm has a first end and a second end, the first end is connected to a common arm, and the second end includes a common contact. The proximity switch further includes a second magnet disposed within the switch body, the second magnet being movable relative to the first magnet. The second end is coupled to the cross arm such that movement of the second magnet causes a corresponding movement of the cross arm between the first switch position and the second switch position. In the first switch position, the common contact of the cross arm contacts the primary contact of the primary arm, thereby completing the circuit between the common arm and the primary arm. In the second switch position, the common contact of the cross arm is in contact with the secondary contact of the secondary arm, thereby completing the circuit between the common arm and the secondary arm.

  In another embodiment, the first magnet and the second magnet are selected to create a first magnetic force between the first magnet and the second magnet, where the first magnetic force is a cross arm. Is maintained in the first switch position. In addition, the second magnet and the target outside the switch body are selected to create a second magnetic force between the second magnet and the target, the second magnetic force being greater than the first magnetic force. If so, the second magnetic force moves the cross arm from the first switch position to the second switch position.

  In a further embodiment, when the second magnetic force between the target and the second magnet is weaker than the first magnetic force between the first magnet and the second magnet, the first magnetic force is cross The arm is moved from the second switch position to the first switch position.

  In yet another embodiment, the first end of the cross arm is pivotally connected to the second end of the common arm, and movement of the second magnet relative to the first magnet causes the cross arm to Rotate from one switch position to the second switch position or from the second switch position to the first switch position. In addition, the elongate actuator arm can couple the second magnet to the common arm. The actuator arm can further be disposed within an opening formed in the first magnet.

  In another embodiment, the first end of each of the common arm, the primary arm, and the secondary arm is disposed outside the switch body. In addition, the switch body can be cylindrical and can be made of a high temperature material. Moreover, the switch body can be made of plastic and the switch body can be sealed.

  In accordance with another exemplary aspect of the present invention, a method of detecting a target with a magnetically triggered proximity switch includes providing a switch body and placing a second end of a common arm within the switch body. . In addition, the primary contact of the primary arm is disposed in the switch body, and the secondary contact of the secondary arm is disposed in the switch body. The method also includes movably connecting a cross arm having a common contact to the common arm and connecting a second magnet to the common arm. The fixed first magnet is positioned in the switch body adjacent to the second magnet so that the common contact of the cross arm contacts the primary contact by the force of the first magnet acting on the second magnet. Be energized by. The method further includes that the magnetic force between the target and the second magnet is greater than the magnetic force between the first magnet and the second magnet, whereby the common contact is disengaged from the primary contact, and the secondary contact. Positioning the target in a first position outside the switch body to move the cross arm to engage.

  In another embodiment, the method provides that the magnetic force between the target and the second magnet is less than the magnetic force between the first magnet and the second magnet so that the common contact is engaged from the secondary contact. It also includes positioning the target in a second position outside of the switch body to disengage and move the cross arm to engage the primary contact.

  In a further embodiment, the cross arm is at the second end of the common arm such that the cross arm pivots to disengage the common contact from the primary contact and to engage the common contact with the secondary contact. It is pivotally connected.

  In yet another embodiment, a closed circuit is formed between the common arm and the primary arm when the common contact engages the primary contact, and is closed when the common contact engages the secondary contact. A circuit is formed between the common arm and the secondary arm.

  In yet another embodiment, the method includes disposing a first end of each of the common arm, the primary arm, and the secondary arm outside the switch body. In addition, the method may include sealing the switch body.

  In accordance with a further exemplary aspect of the present invention, a magnetic trigger proximity switch includes a switch body extending along the body longitudinal axis and a biasing member immovably secured to the switch body. The magnetic trigger proximity switch includes a first normally closed contact having an engagement arm, a second normally closed contact having an engagement arm, a first normally open contact having an engagement arm, and a first having an engagement arm. Also includes two normally open contacts. The magnetic trigger proximity switch further includes a contact magnet disposed within the switch body, the contact magnet being movable between the first switch position and the second switch position such that the contact magnet is movable between the first switch position and the second switch position. It is movable with respect to the biasing member. In the first switch position, the contact magnet contacts a portion of the engagement arm of the first normally closed contact and a portion of the engagement arm of the second normally closed contact, whereby the first normally closed contact and The circuit between the second normally closed contact is completed. In the second switch position, the contact magnet contacts a portion of the engagement arm of the first normally open contact and a portion of the engagement arm of the second normally open contact, thereby causing the first normally open contact and The circuit between the second normally open contact is completed.

  In accordance with another exemplary embodiment of the present invention, a method for detecting a target with a magnetically triggered proximity switch includes providing a switch body and arranging a pair of normally closed contacts within the switch body to provide a pair of normally closed contacts. Including disposing an open contact in the switch body. The method also includes placing a fixed biasing member within the switch body, locating the contact magnet movably adjacent to the biasing member, and the force of the biasing member operating on the contact magnet. Energizing the contact magnet with a pair of normally closed contacts. The method further positions the target in a first position outside the switch body such that the magnetic force between the target and the contact magnet is greater than the magnetic force between the biasing member and the contact magnet, thereby Moving the contact magnet to disengage from the pair of normally closed contacts and to engage with the pair of normally open contacts.

It is a top half sectional view of an embodiment of a magnetic trigger type proximity switch. FIG. 1B is a side view of the embodiment of FIG. 1A. FIG. 1B is a rear view of the embodiment of FIG. 1A. It is an exploded perspective view of an embodiment of a magnetic trigger type proximity switch. It is a perspective view of an embodiment of a magnetic trigger type proximity switch. FIG. 5 is a top view of a first body half of an embodiment of a magnetic trigger proximity switch. It is a perspective view of the common arm of embodiment of a magnetic trigger type proximity switch. It is a perspective view of a cross arm of an embodiment of a magnetic trigger type proximity switch. FIG. 6 is a half cross-sectional view of an embodiment of a magnetic trigger proximity switch in a first switch position. FIG. 6 is a half cross-sectional view of an embodiment of a magnetic trigger proximity switch in a second switch position. It is an exploded perspective view of an embodiment of a magnetic trigger type proximity switch. FIG. 7B is a perspective view of the embodiment of FIG. 7A. FIG. 7B is a side view of the embodiment of FIG. 7A. FIG. 7B is a rear view of the embodiment of FIG. 7A. FIG. 9 is a cross-sectional view of the embodiment of FIG. 8A taken along lines 9A, 9B-9A, 9B illustrating a magnetic trigger proximity switch in a first switch position. 9 is a cross-sectional view of the embodiment of FIG. 8A along lines 9A, 9B-9A, 9B illustrating a magnetic trigger proximity switch in a second switch position. FIG. 7B is a top view of the first body half of the switch body of the embodiment of FIG. 7A. FIG.

  As shown in FIG. 1A, the magnetic trigger proximity switch 10 includes a switch body 12 and a first magnet 14 fixed in the switch body 12 so as not to move. The proximity switch 10 also includes a common arm 16 having a first end 18 and a second end 20, and the second end 20 of the common arm 16 is disposed within the switch body 12. The proximity switch 10 further includes a primary arm 22 having a first end 24 and a second end 26. The second end 26 is disposed within the switch body 12 and the second end 26 includes a primary contact 28. In addition, the proximity switch includes a secondary arm 30 having a first end 32 and a second end 34. The second end 34 is disposed within the switch body 12 and the second end 34 includes a secondary contact 36. The cross arm 38 is disposed in the switch body 12, and the cross arm 38 has a first end 40 and a second end 42. The first end 40 is connected to the common arm 16 and the second end 42 includes a common contact 44. The second magnet 46 is disposed in the switch body 12, and the second magnet 46 is movable with respect to the first magnet 14. Specifically, the second magnet 46 includes a cross arm 38 such that movement of the second magnet 46 causes a corresponding movement of the cross arm 38 between the first switch position and the second switch position. Connected to In the first switch position illustrated in FIG. 6A, the common contact 44 of the cross arm 38 is in contact with the primary contact 28 of the primary arm 22, thereby providing a circuit between the common arm 16 and the primary arm 22. To complete. In the second switch position illustrated in FIG. 6B, the common contact 44 of the cross arm 38 contacts the secondary contact 36 of the secondary arm 30, so that the common arm 16 and the secondary arm 30 are in contact with each other. Complete the circuit.

  FIG. 1A shows a cross-sectional view of the switch body 12 of the magnetic trigger proximity switch 10. The switch body 12 preferably has a substantially cylindrical shape with a circular cross-sectional shape. However, the switch body 12 may have any cross-sectional shape such as, for example, a polygon or an ellipse. The switch body 12 can include a first body half 12a and a second body half 12b. Since the second body half 12b is identical to the first body half 12a, only the first body half 12a is shown. Each of the first body half 12a and the second body half 12b can be formed from plastic and can be manufactured using conventional processes such as, for example, injection molding. The plastic can be a high temperature material that allows the switch body 12 to be exposed to an environment that can damage conventional plastic materials. The first body half 12a and the second body half 12b may be formed using any of several methods known in the art such as ultrasonic welding or with an adhesive, as shown in FIGS. And 3 may be combined into a single switch body 12. In addition, the switch body 12 can be sealed to protect the proximity switch from water or dust particles. However, the switch body 12 can be made from any suitable material and can be manufactured by any means known in the art.

  As illustrated in FIGS. 1A and 4, the semi-cylindrical first body half 12 a of the switch body 12 corresponds to a corresponding mating surface (not shown) of the second body half 12 b to form the switch body 12. ) To have a substantially planar mating surface 51 adapted to engage. The first body half 12 a also includes an open first end 52 that includes a semi-cylindrical second magnet cavity 54, but the second magnet cavity 54 is along the plane of the mating surface 51. It may extend inwardly along the longitudinal axis 56 of the extending body 12. The second magnet cavity 54 is sized to receive a sensing magnet assembly 58 illustrated in FIG. 2 that includes a disk-shaped second magnet 46 and a magnet base 60 coupled to the second magnet 46. The sensing magnet assembly 58 can be slid and displaced within the second magnet cavity 54 along the longitudinal axis 56.

  The semi-cylindrical first magnet cavity 62 also includes a first magnet such that the longitudinal axis of the disk-shaped first magnet 14 is substantially aligned with the longitudinal axis 56 of the first body half 12a. It can be formed in the first body half 12a to receive and secure 14 in the body. A semi-cylindrical upper arm cavity 64 may extend along the longitudinal axis 56 between the second magnet cavity 54 and the first magnet cavity 62, and the upper arm cavity 64 may include the cross arm 38 and the magnet base. 60 may be sized to receive an elongate actuator arm 66 extending therebetween. The generally rectangular contact cavity 68 includes a second end 20 of the common arm 16, a second end 26 of the primary arm 22, a second end 34 of the secondary arm 30, a cross arm 38, and an actuator arm 66. Can be formed in the first body half 12a to receive the first end 116 thereof. The semi-cylindrical lower arm cavity 70 can extend along the longitudinal axis 56 between the first magnet cavity 62 and the contact cavity 68, and the lower arm cavity 70 is sized to receive the actuator arm 66. It can be. The rectangular common slot 72 extends from the contact cavity 68 in a direction generally parallel to the longitudinal axis 56 such that the common slot 72 forms a common opening 75 in the back face 76 of the first body half 12a. It may extend to the second end 74 of the half 12a. The common slot 72 may be sized to receive the common arm 16 such that the first end 18 of the common arm 16 extends through a common opening 75 formed in the back face 76. The rectangular primary slot 78 is generally parallel to the common slot 72 and offset from the contact cavity 68 so that the primary slot 78 forms a primary opening 80 in the back face 76 of the first body half 12a. It may extend to the second end 74 of one body half 12a. The primary slot 78 may be sized to receive the primary arm 22 such that the first end 24 of the primary arm 22 extends through the primary opening 80 of the back face 76. In addition, the rectangular secondary slot 82 is generally parallel to both the common slot 72 and the primary slot 78 such that the secondary slot 82 forms a secondary opening 84 in the back face 76 of the first body half 12a. And can be offset therefrom and extend from the contact cavity 68 to the second end 74 of the first body half 12a. The secondary slot 82 may be sized to receive the secondary arm 32 such that the first end 32 of the secondary arm 32 extends through the secondary opening 84 of the back face 76. .

  As described above and illustrated in FIGS. 1A and 2, the magnetic trigger proximity switch 10 is also in the second magnet cavity 54 of the first body half 12 a and the second body half 12 b of the switch body 12. A sensing magnet assembly 58 is slidably disposed. The detection magnet assembly 58 may include a second magnet 46, also referred to as a detection magnet, that may be cylindrical. Preferably, the second magnet 46 has a disk shape. The second magnet 46 may be a permanent magnet or any other type of suitable magnet. The sensing magnet assembly 58 may also include a magnet base 60 that may have a planar bottom portion 86 and a circumferential side wall 88 extending from the bottom portion 86. The bottom portion 86 and the sidewall 88 are such that the planar surface of the second magnet 46 is proximate to the top of the sidewall 88 and the outer radius of the second magnet 46 is slightly smaller than the inner radius of the sidewall 88. , May be dimensioned to receive the second magnet 46. The magnet base 60 can be made of a metal such as stainless steel, and the second magnet 46 can be fixed to the magnet base 60 by a magnetic force. Alternatively, the magnet base 60 can be made from a non-magnetic material and the second magnet 46 can be secured to the magnet base 60 mechanically or with an adhesive.

  Referring again to FIGS. 1A and 2, the magnetic trigger proximity switch 10 further includes a first magnet 14, also referred to as a biasing magnet. The first magnet 14 may be cylindrical and may have a disk shape. The first magnet 14 may also have an opening 90 formed along the central longitudinal axis of the first magnet 14, and the opening 90 may be sized to receive the actuator arm 66. The first magnet 14 is connected to the switch body 12 so that the first magnet 14 cannot be displaced when the first body half 12a and the second body half 12b are joined together to form the switch body 12. The first magnet cavity 62 may be received. The first magnet 14 can be made of the same material as the second magnet 46, but the radius and thickness of the first magnet 14 are each smaller than the respective radius and thickness of the second magnet 46. obtain. The first magnet 14 may be positioned within the first magnet cavity 62 such that the second magnet 46 is attracted to the first magnet 14. That is, when the north pole of the second magnet 46 faces the second end 74 of the switch body 12, the south pole of the first magnet 14 faces the north pole of the second magnet 46. Conversely, when the south pole of the second magnet 46 faces the second end 74 of the switch body 12, the north pole of the first magnet 14 faces the south pole of the second magnet 46.

  Referring to FIGS. 1A, 2, and 5A, the magnetic trigger proximity switch 10 is also a common component of the circuit formed by the first switch position and the circuit formed by the second switch position. Arm 16 is included. The common arm 16 can be a strip of conductive metal, such as copper or a copper alloy, and the common arm 16 can be formed from a stamping process. As described above, the second end 20 of the common arm 16 extends through the common slot 72 in which the common arm 16 is formed in the switch body 12, and the first end 18 is the common opening 75. And is disposed in the contact cavity 68 so as to project to a position outside the switch body 12. The common arm 16 has a plane in which the longitudinal axis of the common arm 16 is parallel to the longitudinal axis 56 of the switch body 12 while the common arm 16 passes through the mating surface 51 of the first body half 12a in the transverse direction. Can be positioned in the common slot 72 so as to be orthogonal to each other. The back surface 91 of the common arm 16 may contact the first wall 92 of the common slot 72, but the first wall 92 is longitudinally aligned with the common arm 16, as shown in FIG. It is perpendicular to the plane of the mating surface 51. A portion of the common arm 16 disposed within the common slot 72 may be curved and the top surface of the curved portion 94 may contact the second wall 96 that forms the common slot 72, while the second wall 96 is It is offset from and parallel to the first wall 92. Since the lateral distance between the top surface of the curved portion 94 and the back surface 91 of the common arm 16 is greater than the distance between the first wall 92 and the second wall 96 of the common slot 72, the common arm An interference fit is provided that secures 16 within the common slot 72. The bottom surface 98 of the common arm 16 may contact the third wall 100 that forms the common slot 72 of the first body half 12a, but the third wall 100 may be the first wall 92 and the second wall. The top surface 102 of the common arm 16 is at a right angle to 96 and the corresponding common slot 72 of the second body half 12b when the first body half 12a and the second body half 12b are combined with the switch body 12. May contact a fourth wall (not shown). Because the third wall 100 of the common slot 72 is closer to the plane formed by the mating surface 51 than the bottom surface 98 of the contact cavity 68, the contact between the bottom surface 101 of the common arm 16 and the first body half 12a. There is a gap between the bottom surface 101 of the cavity 68. Similarly, there is a gap between the top surface 102 of the common arm 16 and the top surface (not shown) of the contact cavity 68 of the second body half 12b. The common arm 16 may also include a lateral slot 104 that extends across the width of the common arm 16 proximate the second end 20.

  With reference to FIGS. 1A and 2, the magnetic trigger proximity switch 10 also includes a primary arm 22. Primary arm 22 may be made from the same material as common arm 16, and primary arm 22 may engage primary slot 78 in the same manner that common arm 16 engages common slot 72. Accordingly, the curved portion 106 of the primary arm 22 provides an interference fit within the primary slot 78 to retain the primary arm 22 within the primary slot 78. In addition, the first end 24 of the primary arm 22 is parallel to the first end 18 of the common arm 16 when the first end 24 of the primary arm 22 is viewed perpendicular to the mating surface 51. So as to extend from the primary opening 80 formed in the back face 76 of the switch body 12. The second end 26 of the primary arm 22 is connected to the primary contact 28. Primary contact 28 may be made from a conductive metal such as copper or copper alloy, and primary contact 28 may be secured to primary arm 22 in any manner known in the art, such as soldering or mechanical clamping. Alternatively, the primary contact 28 can be integrally formed with the second end 26 of the primary arm 22. Primary contact 28 may be disposed proximate to first cavity wall 108 that partially defines contact cavity 68.

  With reference to FIGS. 1A and 2, the magnetic trigger proximity switch 10 also includes a secondary arm 30. The secondary arm 30 can be made from the same material as the common arm 16, and the secondary arm 30 can engage the secondary slot 82 in the same manner that the common arm 16 engages the common slot 72. However, the secondary arm 30 may be positioned in the secondary slot 82 in a “mirror image” relationship with the primary arm 22 in the primary slot 78. More specifically, the top surface of the curved portion 110 of the secondary arm 30 may face the top surface of the curved portion 106 of the primary arm 22. As configured, the first end 32 of the secondary arm 30 is positioned so that the first end 32 of the secondary arm 30 is the first end of the primary arm 22 when viewed perpendicular to the mating surface 51. It extends from a secondary opening 84 formed in the back face 76 of the switch body 12 so as to be parallel to both the end 24 and the first end 18 of the common arm 16. The second end 34 of the secondary arm 30 is connected to the secondary contact 36. Similar to the primary contact 28, the secondary contact 36 can be made from a conductive metal such as copper or a copper alloy, and any manner known in the art, such as secondary contact 36 soldering or mechanical clamping. Can be fixed to the secondary arm 30. Alternatively, the secondary contact 36 can be formed integrally with the second end 34 of the secondary arm 30. The secondary contact 36 may be disposed adjacent to the second cavity wall 112 of the contact cavity 68 that is offset from and parallel to the first cavity wall 108.

  With reference to FIGS. 1A, 2, and 5 B, the magnetic trigger proximity switch 10 also includes a cross arm 38. Cross arm 38 may be formed from a strip of conductive metal, such as copper or copper alloy, and common arm 16 may be formed from a stamping process followed by a bending process. The second end 42 of the cross arm 38 may include a common contact 44. Common contact 44 may be made from a strip of conductive metal, such as copper or copper alloy, and common contact 44 may be attached to cross arm 38 in any manner known in the art, such as soldering or mechanical clamping. Can be fixed. Alternatively, the common contact 44 can be integrally formed with the second end 42 of the cross arm 38. The first end 40 of the cross arm 38 may include an end loop 114, but a portion of the end loop 114 may be configured such that the cross arm 38 maintains contact with the common arm 16 while the second of the common arm 16. Can be disposed within the transverse slot 104 of the common arm 16 so as to rotate about the end 20 thereof. The cross arm 38 may rotate around the second end 20 of the common arm 16 between a first switch position and a second switch position. In the first switch position shown in FIG. 6A, the common contact 44 of the cross arm 38 contacts the primary contact 28 of the primary arm 22, thereby completing the circuit between the common arm 16 and the primary arm 22. . In the second switch position shown in FIG. 6B, the common contact 44 of the cross arm 38 contacts the secondary contact 36 of the secondary arm 30, thereby causing a circuit between the common arm 16 and the secondary arm 30. To complete.

  With reference to FIGS. 1A, 2, and 5 B, the magnetic trigger proximity switch 10 also includes an actuator arm 66. Actuator arm 66 may be an elongated cylinder having a first end 116 and a second end 118 opposite the first end 116. Instead of a cylinder, the actuator arm 66 may have any suitable cross-sectional shape or combination of shapes such as square, elliptical, or polygonal. Actuator arm 66 may be formed from a plastic material or any other suitable material. The actuator arm 66 may be slidably disposed within the upper arm cavity 64 and the lower arm cavity 70 of the switch body 12, but each of the upper arm cavity 64 and the lower arm cavity 70 of the switch body 12 It may have an inner diameter that is slightly larger than the outer diameter. The actuator arm 66 may also extend through the opening 90 of the first magnet 14 when the first magnet 14 is disposed within the first magnet cavity 62. The first end 116 of the actuator arm 66 may include a groove 120 that defines an opening in the cross arm 38 to secure the actuator arm 66 to the cross arm 38, as shown in FIG. 5B. An edge portion 122 may be received. However, the first end 116 may be coupled to the cross arm 38 by any means known in the art, such as mechanical clamping. The second end 118 of the actuator arm 66 may be coupled to the magnet base 60 of the detection magnet assembly 58 in a manner similar to the coupling of the first end 116 to the cross arm 38.

  In operation, the first magnet 14 provides a magnetic force that attracts the second magnet 46. This attractive force displaces the sensing magnet assembly 58 toward the first magnet 14, thereby displacing the actuator arm 66 toward the second end 74 of the switch body 12. Displacement of the actuator arm 66 causes the cross arm 38 to rotate about the second end 20 of the common arm 16 such that the common contact 44 contacts the primary contact 28. In the first switch position shown in FIG. 6A, the circuit between the primary arm 22 and the common arm 16 is completed. Thus, a closed circuit due to the first switch position can be detected by a processor operably connected to the first end 18 of the common arm 16 and the first end 24 of the primary arm 22. Is possible.

  However, when the magnetic target 124, which can include a permanent magnet or irons, is moved to a position within a predetermined range of the proximity switch 10, the magnetic force between the target 124 and the second magnet 46 is increased by the second magnet 46. And the magnetic force between the first magnet 14 and the first magnet 14. This greater force displaces the sensing magnet assembly 58 toward the target 124 and away from the first magnet 14, thereby causing an actuator arm that is rigidly coupled to the magnet base 60 of the sensing magnet assembly 58. 66 is displaced. As the actuator arm 66 is displaced, the cross arm 38 rotates around the second end 20 of the common arm 16 to disengage the common contact 44 from contact with the primary contact 28 and to provide a secondary contact. It moves so that it may contact 36. In the second switch position shown in FIG. 6B, the circuit between the secondary arm 30 and the common arm 16 is completed. Thus, a closed circuit due to the second switch position is detected by a processor operably connected to the first end 18 of the common arm 16 and the first end 32 of the secondary arm 30. Is possible. When the target is no longer within the predetermined range of the proximity switch 10, the magnetic force between the first magnet 14 and the second magnet 46 is greater than the magnetic force between the second magnet 46 and the target 124. , And the proximity switch 10 moves to the first position in the manner described above.

  Those skilled in the art will recognize that the magnetic force between the target 124 and the second magnet 46 is such as the relative magnitude of the target 124 and the second magnet 46 and the distance between the target 124 and the second magnet 46. It will be appreciated that several factors can be relied upon, and that these variables can be adjusted to provide optimal interaction between the proximity switch 10 and the target 124. In a similar manner, the magnetic force between the second magnet 46 and the first magnet 14 can also be adjusted.

  Those skilled in the art also contemplate that the disclosed embodiment of the magnetic trigger proximity switch 10 assumes a relatively small switch body 12 having an integrated design, which further includes the magnetic trigger proximity switch 10 as a switchboard. It will be appreciated that it can be used in applications with limited space requirements, such as in Those skilled in the art also recognize that the disclosed embodiment of the magnetic trigger proximity switch 10 does not require an external power source to function, unlike typical proximity switches, thereby simplifying the installation of the proximity switch 10. It will be apparent that the service life is extended.

  Nevertheless, changes may be made to the disclosed embodiments of proximity switch 10 that are within the scope of the appended claims. For example, instead of the single pole / single throw configuration described, a double pole / double throw configuration is also envisaged. In addition, an LED may be included in the housing to visually indicate whether the proximity switch is in the first switch position or the second switch position.

  FIG. 7A shows an alternative embodiment of a magnetic trigger proximity switch 200 that includes a switch body 202 extending along the body longitudinal axis 204, but the biasing member 206 is immovably secured within the switch body 202. The The magnetic trigger proximity switch 200 also includes a first normally closed contact 208 having an engagement arm 210, a second normally closed contact 212 having an engagement arm 214, and a first normally open contact 216 having an engagement arm 218. , And a second normally open contact 220 having an engagement arm 222. The magnetic trigger proximity switch 200 further includes a contact magnet 224 disposed within the switch body 202, the contact magnet 224 having a first switch position 226 (shown in FIG. 9A) and a second. Is movable relative to the biasing member 206 so as to be movable between the switch positions 228 (shown in FIG. 9B). In the first switch position 226 illustrated in FIG. 9A, the contact magnet 224 contacts a portion of the engagement arm 210 of the first normally closed contact 208 and a portion of the engagement arm 214 of the second normally closed contact 212. Thus, the circuit between the first normally closed contact 208 and the second normally closed contact 212 is completed. In the second switch position 228 illustrated in FIG. 9B, the contact magnet 224 contacts a portion of the engagement arm 218 of the first normally open contact 216 and a portion of the engagement arm 222 of the second normally open contact 220. Thus, the circuit between the first normally open contact 216 and the second normally open contact 220 is completed.

  Referring to FIGS. 7A and 7B, magnetic trigger proximity switch 200 has a body longitudinal direction so that switch body 202 has a first end 232 and a second end 234 opposite the first end 232. A switch body 202 extends along the directional axis 204. The switch body 202 preferably has a substantially cylindrical shape with a circular cross section. However, the switch body 202 can have any cross-sectional shape such as, for example, a polygon or an ellipse. The switch body 202 may comprise a single unitary part, or may comprise two or more component parts connected to form the switch body 202. For example, the switch body 202 may include a first body half 230a and a second body half 230b that combine to form the switch body 202, but the first body half 230a and the second body half 230b are identical. Or they may be substantially the same. Each of the first body half 230a and the second body half 230b can be formed from a non-conductive material such as plastic, ceramic, epoxy, or rubber, and using conventional processes such as, for example, injection molding. Can be manufactured. The plastic may be a high temperature material that allows the switch body 202 to be exposed to an environment that can damage conventional plastic materials. The first body half 230a and the second body half 230b can be joined together using any of several methods known in the art such as ultrasonic welding or using an adhesive. The switch body 202 can be formed. However, the switch body 202 can be made from any suitable material and can be manufactured by any means known in the art.

  As shown in FIGS. 7A, 9A, 9B, and 10, the first body half 230a of the switch body 202 is the body from the first end 232 of the switch body 202 to the second end 234 of the switch body. It can extend along the longitudinal axis 204. The first body half 230a is a substantially planar mating surface 236a adapted to engage a corresponding mating surface (not shown) of the second body half 230b to form the switch body 202. Can have. The first body half 230a may also include a first cavity 238a, but the first cavity 238a may extend along the body longitudinal axis 204 that extends along the plane of the mating surface 236a. The first cavity 238a may be disposed adjacent to the first end 232 of the switch body 202, and the first cavity 238a is shaped and configured to receive a biasing member 206, which will be described in detail below. Can be sized. For example, the first cavity 238 a can be semi-cylindrical and have a longitudinal axis that is coaxial with the body longitudinal axis 204. More specifically, the first cavity 238 a is connected to the planar first wall 278 a disposed in the first longitudinal portion of the first cavity 238 a and the first end 232 of the switch body 202. A planar second wall 280a may be included disposed in a second longitudinal portion of the adjacent first cavity 238a. The first wall 278a and the second wall 280a may each be perpendicular to the body longitudinal axis 204. A semi-cylindrical circumferential cavity surface 282 a may extend between the first wall 278 a and the second wall 280 a, but the longitudinal axis of the circumferential cavity surface 282 a is coaxial with the body longitudinal axis 204. Can be aligned. Thus configured, when the first body half 230a and the second body half 230b are connected to form the switch body 202, the first cavity 238a and the second cavity 238a of the first body half 230a The first cavities 238 b of the body half 230 b combine to form a cylindrical first cavity 238 that has a longitudinal axis that is symmetrical about the body longitudinal axis 204 and aligned with the body longitudinal axis 204. Form.

  Still referring to FIGS. 7A, 9A, 9B, and 10, the cylindrical first formed by the first cavity 238a of the first body half 230a and the first cavity 238b of the second body half 230b. The cavity 238 is adapted to receive a disk-shaped biasing member 206 (also referred to as a “biasing disk”) so that the biasing member 206 is immovable within the cylindrical first cavity 238 of the switch body 202. To be fixed (or substantially immovable). More specifically, the longitudinal length (ie, the longitudinal distance between the first walls 278a, 278b and the second walls 280a, 280b) and the diameter of the cylindrical first cavity 238 (ie, Each of the semi-cylindrical circumferential cavity surfaces 282a, 282b sum of individual radii) is slightly larger (eg, 3% to 10% larger) than each of the longitudinal length and the diameter of the cylindrical biasing member 206. ). The biasing member 206 may have a longitudinal axis that is aligned coaxially with the body longitudinal axis 204 when disposed within the first cavity 238. The biasing member 206 is made of a steel material (such as steel), a magnetic material, or other material or combination of materials that provide or cause an attractive force between the material and the magnet (ie, the contact magnet 224). obtain.

  As illustrated in FIGS. 7A and 10, the first body half 230 a of the switch body 202 may include a second cavity 240 a formed in the switch body 202. The second cavity 240a includes a first cavity 238a and a second end 234 of the switch body 202 such that one end of the second cavity 240a is adjacent to the second end 234 of the switch body 202. Between the two. The second cavity 240a can be shaped and sized to receive a displaceable contact magnet 224, detailed below. For example, the second cavity 240 a can be semi-cylindrical and can have a longitudinal axis that is coaxial with the body longitudinal axis 204. More specifically, the second cavity 240a includes a planar first wall 242a disposed at a first longitudinal end of the second cavity 240a and a second end 234 of the switch body 202. May include a planar second wall 244a disposed at a second longitudinal end of the second cavity 240a adjacent to the second cavity 240a. The first wall 242a and the second wall 244a may each be perpendicular to the body longitudinal axis 204. A semi-cylindrical circumferential cavity surface 246 a can extend between the first wall 242 and the second wall 244, and the longitudinal axis of the circumferential cavity surface 246 a is coaxial with the body longitudinal axis 204. possible. As such, when the first body half 230a and the second body half 230b are combined to form the switch body 202, the circumferential cavity surface 246a and the second body surface 246a of the first body half 230a The circumferential cavity surface 246b of the body half 230b cooperates to provide a second cavity 240 that is symmetrically disposed about the body longitudinal axis 204 (ie, has a longitudinal axis that is coaxially aligned therewith). Forming a cylindrical surface. The first wall 242a and the second wall 244a are longitudinally separated by any suitable distance so that the contact magnet 224 is illustrated in the manner described in detail below (shown in FIGS. 9A and 9B). So as to allow longitudinal displacement from the first switch position 226 to the second switch position 228. The radius of the circumferential cavity surfaces 246a, 246b (ie, the diameter of the second cavity 240) is such that the contact magnet 224 is in a manner that will be described in more detail below (as illustrated in FIGS. 9A and 9B). It can have any value that allows longitudinal displacement from one switch position 226 to a second switch position 228.

  Still referring to FIGS. 7A and 10, the first body half 230a is a first body that extends from the outer surface 252a of the first body half 230a to the circumferential cavity surface 246a of the first body half 230a. The contact opening 248 and the second contact opening 250 may be further included. The first contact opening 248 and the second contact opening 250 may intersect the circumferential cavity surface 246a at or adjacent to the second wall 244a of the second cavity 240a. For example, a portion of the first contact opening 248 and a portion of the second contact opening 250 may contact (or immediately adjacent) an edge formed by the intersection of the circumferential cavity surface 246a and the second wall 244a. ). The first contact opening 248 and the second contact opening 250 may each extend along a longitudinal axis, but each longitudinal axis may be parallel and perpendicular to the body longitudinal axis 204. It may extend along one reference plane 254. First contact opening 248 and second contact opening 250 are symmetrical about body longitudinal axis 204 when viewed perpendicular to planar mating surface 236a (ie, from body longitudinal axis 204). Equidistantly). The first contact opening 248 and the second contact opening 250 are any suitable to receive the engagement arm 218 of the first normally open contact 216 and the engagement arm 222 of the second normally open contact 220, respectively. It can have a size and shape. For example, if the engagement arms 218, 222 each have a circular cross-sectional shape, the first contact opening 248 and the second contact opening 250 each have a diameter that is slightly larger than the diameter of the engagement arms 218, 222. It can have a circular cross-sectional shape. Alternatively, the first contact opening 248 and the second contact opening may be used to allow an interference fit to secure the engagement arms 218, 222 within the first contact opening 248 and the second contact opening 250. The diameter of 250 can be substantially equal to (or slightly less than) the diameter of the engagement arms 218, 222. The first contact opening 248 and the second contact opening 250 are adapted to engage and hold the engagement arm 218 of the first normally open contact 216 and the engagement arm 222 of the second normally open contact 220. It may have one or more internal tabs, ridges, fins, or other features that can be actuated.

  Still referring to FIGS. 7A and 10, the second body half 230b is a first body that extends from the outer surface 252b of the second body half 230b to the circumferential cavity surface 246b of the second body half 230b. Contact opening 256 and second contact opening 258 may be included. The first contact opening 256 and the second contact opening 258 may intersect the circumferential cavity surface 246b at or adjacent to the first wall 242b of the second cavity 240b of the second body half 230b. . For example, a portion of the first contact opening 256 and a portion of the second contact opening 258 can contact (or immediately adjacent) an edge formed by the intersection of the circumferential cavity surface 246b and the first wall 242b. ). First contact opening 256 and second contact opening 258 may each extend along a longitudinal axis, each longitudinal axis may be parallel and orthogonal to body longitudinal axis 204, and It may extend along a second reference plane 260 that is offset longitudinally from the first reference plane 254. The first contact opening 256 and the second contact opening 258 are symmetrical about the body longitudinal axis 204 when viewed perpendicular to the planar mating surface 236b of the second body half 230b (ie, , Equidistant from the body longitudinal axis 204. In addition, the longitudinal axis of the first contact opening 248 of the first body half 230a, when viewed perpendicular to the planar mating surface 236a of the first body half 230a, is the second body half 230b. The first contact opening 256 may be longitudinally aligned with the longitudinal axis (ie, aligned with a reference axis parallel to the body longitudinal axis 204). Similarly, the longitudinal axis of the second contact opening 250 of the first body half 230a when viewed perpendicular to the planar mating surface 236a of the first body half 230a is that of the second body half 230b. The second contact opening 258 can be longitudinally aligned with the longitudinal axis (ie, aligned with a reference axis parallel to the body longitudinal axis 204). The first contact opening 256 and the second contact opening 258 may be any suitable means for receiving the engagement arm 210 of the first normally closed contact 208 and the engagement arm 214 of the second normally closed contact 212, respectively. It can have a size and shape. For example, if the engagement arms 210, 214 each have a circular cross-sectional shape, the first contact opening 256 and the second contact opening 258 each have a diameter that is slightly larger than the diameter of the engagement arms 210, 214. It can have a circular cross-sectional shape. Alternatively, the first contact opening 256 and the second contact opening may be used to allow an interference fit to secure the engagement arms 210, 214 within the first contact opening 256 and the second contact opening 258. The diameter of 258 can be substantially equal to (or slightly less than) the diameter of engagement arms 210, 214. The first contact opening 256 and the second contact opening 258 engage and engage the engagement arm 210 of the first normally closed contact 208 and the engagement arm 214 of the second normally closed contact 212. It may have one or more internal tabs, ridges, fins, or other features that can be actuated.

  As illustrated in FIGS. 7A and 10, the first body half 230a also includes first alignments that are coaxially aligned with the first contact opening 256 and the second contact opening 258, respectively, of the second body half 230b. One auxiliary contact opening 264 and a second auxiliary contact opening 266 may be included. Similarly, the second body half 230b also includes a first auxiliary contact opening 268 and a first auxiliary contact opening 268 that are each coaxially aligned with the first contact opening 248 and the second contact opening 250, respectively, of the first body half 230a. Two auxiliary contact openings 270 may be included.

  Referring to FIG. 7A, the first body half 230a may include one or more longitudinal grooves 262a formed in the outer surface 252a. For example, the first body half 230a may include two grooves 262a that extend along the outer surface 252a such that each of the grooves 262a is parallel to the body longitudinal axis 204. The first of the two grooves 262a has a first contact such that each of the first contact opening 248 and the first auxiliary contact opening 264 intersects the outer surface 252a within the first groove 262a. The opening 248 and the first auxiliary contact opening 264 may be intersected. The second of the two grooves 262a has a second contact such that each of the second contact opening 250 and the second auxiliary contact opening 266 intersects the outer surface 252a within the second groove 262a. It may intersect opening 250 and second auxiliary contact opening 266. Each of the first and second grooves 262 a may extend from the first end 232 of the switch body 202 to a point adjacent to the second end 234 of the switch body 202. With reference to FIG. 7A, the second body half 230b may include one or more longitudinal grooves 262b formed in the outer surface 252b. For example, the second body half 230b can include two grooves 262b extending along the outer surface 252b such that each of the grooves 262b is parallel to the body longitudinal axis 204. The first of the two grooves 262b has a first contact such that each of the first contact opening 256 and the first auxiliary contact opening 268 intersects the outer surface 252b within the first groove 262b. The opening 256 and the first auxiliary contact opening 268 may be crossed. The second of the two grooves 262b has a second contact such that each of the second contact opening 258 and the second auxiliary contact opening 270 intersects the outer surface 252b within the second groove 262b. It may intersect the opening 258 and the second auxiliary contact opening 270. Each of the first and second grooves 262 b may extend from the first end 232 of the switch body 202 to a point adjacent to the second end 234 of the switch body 202. Each of the grooves 262a, 262b includes a portion of the first normally closed contact 208, the second normally closed contact 212, the first normally open contact 216, and the second normally open contact 220 as follows: It may have the same cross-sectional shape adapted to be received in the manner described in detail.

  As illustrated in FIGS. 7A, 7B, 8B, 9A, and 9B, the magnetic trigger proximity switch 200 may include a first normally closed contact 208 and a second normally closed contact 212. The first normally closed contact 208 may include an engagement arm 210 that is received in the first contact opening 256 of the second body half 230b. The engagement arm 210 may have any suitable shape, such as an elongated cylindrical shape, having a longitudinal axis that is coaxially aligned with the longitudinal axis of the first contact opening 256. The first normally closed contact 208 may also include an elongated extending arm 272 that extends from the first distal end 274 of the engagement arm 210. The extending arm 272 has a longitudinal axis disposed perpendicular to the longitudinal axis of the engagement arm 210 such that the first normally closed contact 208 has an L shape, such as any elongated cylindrical shape. Can have a suitable shape. With the engagement arm 210 received in the first contact opening 256 of the second body half 230 b, the extension arm 272 has a distal end 276 of the extension arm 272 that is a first end of the switch body 202. Longitudinally received in a corresponding groove 262b formed on the outer surface 252b of the second body half 230b to extend beyond the portion 232. Because of this positioning, the engagement arm 210 received in the first contact opening 256 of the second body half 230b is also used to further secure the engagement arm 210 within the switch body 202. One body half 230a may be at least partially received in the first auxiliary contact opening 264.

  The second normally closed contact 212 is such that the engaging arm 210 of the first normally closed contact 208 is the first auxiliary opening 256 of the second body half 230b and the first auxiliary of the first body half 230a, respectively. Engagement arms 214 received in the second contact opening 258 of the second body half 230b and the second auxiliary contact opening 266 of the first body half 230a in the same manner as received in the contact opening 264. Can be included. The elongate extending arm 286 may extend from the distal end 288 of the engagement arm 214, but the extending arm 286 also has a distal end 290 of the extending arm 286 that is a first end of the switch body 202. 232 may be longitudinally received in corresponding grooves 262b formed on the outer surface 252b of the second body half 230b to extend beyond 232.

  Referring again to FIGS. 7A, 7B, 8A, 8B, 9A, and 9B, the magnetic trigger proximity switch 200 may include a first normally open contact 216 and a second normally open contact 220. The first normally open contact 216 extends into the engagement arm 210 of the first normally closed contact 208 to the first contact opening 248 of the first body half 230a and the first auxiliary contact opening 268 of the second body half 230b. Each include an engagement arm 218 received in the same manner as received in the first contact opening 256 of the second body half 230b and the first auxiliary contact opening 264 of the first body half 230a. obtain. The elongated extending arm 292 can extend from the distal end 294 of the engagement arm 218, and the extending arm 292 has a distal end 296 of the extending arm 292 that extends beyond the first end 232 of the switch body 202. Extending longitudinally into a corresponding groove 262a formed on the outer surface 252a of the first body half 230a.

  The second normally open contact 220 is such that the engagement arm 210 of the first normally closed contact 208 is the first contact opening 256 of the second body half 230b and the first auxiliary of the first body half 230a, respectively. In the same manner as received in the contact opening 264, the engagement arm 222 received in the second contact opening 250 of the first body half 230a and the second auxiliary contact opening 270 of the second body half 230b. May be included. An elongate extending arm 298 may extend from the distal end 300 of the engagement arm 222 such that the distal end 302 of the extending arm 298 exceeds the first end 232 of the switch body 202. Can be longitudinally received in corresponding grooves 262a formed on the outer surface 252a of the first body half 230a. Because configured as described above, the extending arms 272, 286, 292, and 298 can be parallel, and the distal ends 284, 290, 296, and 302 of the extending arms 272, 286, 292, and 298 Each may be equidistant in the longitudinal direction from the first end 232 of the switch body 202. The first and second normally closed contacts 208, 212 and the first and second normally open contacts 216, 220 are each made of any suitable non-magnetic conductive material or material such as, for example, copper or silver. Can be made from a combination. The first and second normally closed contacts 208, 212 and the first and second normally open contacts 216, 220 can also be fully or partially covered by any suitable plating, such as gold plating (eg, contact Only the portion intended to engage the magnet 224 can be coated).

  Referring again to FIGS. 7A, 7B, 8A, 8B, 9A, and 9B, the magnetic trigger proximity switch 200 includes a body sleeve 304 surrounding the switch body 202 from the first end 232 and the second end 234. May be included. The cross-sectional shape of the body sleeve 304 can correspond to the cross-sectional shape of the switch body 202. For example, if the switch body 202 (which may consist of a first body half 230a and a second body half 230b) has a cylindrical shape with a circular cross-section, the body sleeve 304 may have a cylindrical inner surface 306 and an outer surface 308. Can have. The outer surface 308 can have any suitable shape, such as a cylindrical shape, and can include one or more attachment features (not shown). Inner surface 306 may have a diameter that is slightly larger than the outer diameter of the cylindrical outer surface of switch body 202 (ie, outer surfaces 252a and 252b), and the longitudinal axes of inner surface 306 and outer surface 308 are It may be aligned coaxially with the longitudinal axis 204. To accommodate the switch body extension arms 272, 286, 292, and 298 disposed in grooves 262a, 262b formed in the outer surfaces 252a, 252b of the switch body 202, the inner surface 306 of the body sleeve 304 and the switch There may be a small gap between the cylindrical outer surface 252 of the body 202 and the contact between the inner surface 306 of the body sleeve 304 and the extending arms 272, 286, 292, and 298 is associated. The engagement arms 210, 214, 218, and 222 may be maintained in a desired position relative to the switch body 202. The gap between the inner surface 306 of the body sleeve 304 and the cylindrical outer surface 252 of the switch body 202 is epoxy and / or any other suitable seal to prevent water and dust from entering the gap. Can be filled with material. The body sleeve 304 may include an end wall 309 disposed at the longitudinal end of the body sleeve 304 adjacent to the second end 234 of the switch body 202, which end wall 309 may be included in the body sleeve 304. The longitudinal end can be closed. The end wall 309 can be planar and can extend perpendicular to the body longitudinal axis 204. Instead of having an end wall 309, the longitudinal end of the body sleeve 304 adjacent to the second end 234 of the switch body 202 can be open. The body sleeve 304 is made of any suitable non-conductive and non-magnetic material (eg, plastic, ceramic, epoxy, or rubber), such as the same non-conductive plastic material used to form the switch body 202. Can be formed.

  As illustrated in FIGS. 7A, 9A, and 9B, the magnetic trigger proximity switch 200 also includes a contact magnet 224 disposed within the switch body 202. More specifically, the contact magnet 224 has a cylindrical shape formed by a semi-cylindrical second cavity 240a of the first body half 230a and a semi-cylindrical second cavity 240b of the second body half 230b. It can be disposed in the second cavity 240 of the switch body 202, which can be a cavity. The contact magnet 224 may be spherical and may have a diameter that is slightly smaller (eg, 3-15% smaller) than the diameter of the cylindrical second cavity 240. Contact magnet 224 can be made of or coated with a conductive material. For example, the contact magnet 224 can be a gold-plated spherical neodymium magnet. However, the contact magnet 224 allows the contact magnet 224 to be displaced longitudinally from the first switch position 226 (shown in FIG. 9A) to the second switch position 228 (shown in FIG. 9B). Can have any shape or size.

  When assembled as described, with the biasing member 206 in the first cavity 238 of the switch body 202 and the contact magnet 224 disposed in the second cavity 240 of the switch body 202, the attractive force (Ie, the first magnetic force) operates between the biasing member 206 and the contact magnet 224 to maintain the contact magnet 224 in the first switch position 226 (shown in FIG. 9A). In this first switch position 226, the conductive contact magnet 224 is in contact with a portion of the engagement arm 210 of the first normally closed contact 208 and a portion of the engagement arm 214 of the second normally closed contact 212. Thereby completing the circuit between the first normally closed contact 208 and the second normally closed contact 212. Also, in this first switch position 226, the conductive contact magnet 224 is in contact with any part of the engagement arm 218 of the first normally open contact 216 or any part of the engagement arm 222 of the second normally open contact 220. There is no contact, resulting in an open circuit between the first normally open contact 216 and the second normally open contact 220. Accordingly, the closure circuit resulting from the first switch position 226 is a processor, controller, or portion of the extended arm 272 (such as the distal end 284) of the first normally closed contact 208 and the second normally closed contact. It can be detected by other detectors operably connected to a portion (such as the distal end 290) of the 212 extended arm 286. Similarly, the open circuit resulting from the first switch position 226 may include a processor, a controller, or a portion of the extended arm 292 (such as the distal end 296) of the first normally open contact 216 and the second normally open. It can be detected by other detectors operatively connected to a portion (such as the distal end 302) of the extended arm 298 of the contact 220.

  However, when the magnetic target 310, which may be formed from or include a permanent magnet or ferrous metal, is moved to a position within a predetermined range of the proximity switch 200, as illustrated in FIG. 9B, the target 310 and the contact magnet 224. Can be greater than the first magnetic force (ie, the attractive force between the contact magnet 224 and the biasing member 206). Within this predetermined range, a stronger second magnetic force is activated, causing the contact magnet 224 to extend from the first switch position 226 illustrated in FIG. 9A to the second switch position 228 illustrated in FIG. 9B. Displace in the direction. In this second switch position 228, the conductive contact magnet 224 is in contact with a portion of the engagement arm 218 of the first normally open contact 216 and a portion of the engagement arm 222 of the second normally open contact 220. Thereby completing the circuit between the first normally open contact 216 and the second normally open contact 220. Thus, the closure circuit resulting from the second switch position 228 is a processor, controller, or portion of the extended arm 292 (such as the distal end 296) of the first normally open contact 216 and the second normally open contact. It can be detected by other detectors operably connected to a portion (such as distal end 302) of 220 extending arms 298. Also, in this second switch position 228, the conductive contact magnet 224 is in contact with any part of the engagement arm 210 of the first normally closed contact 208 or any part of the engagement arm 214 of the second normally closed contact 212. There is no contact, resulting in an open circuit between the first normally closed contact 208 and the second normally closed contact 212. Thus, the open circuit resulting from the second switch position 228 is a processor, controller, or portion of the extended arm 272 (such as the distal end 284) of the first normally closed contact 208 and the second normally closed contact. It can be detected by other detectors operably connected to a portion (such as the distal end 290) of the 212 extended arm 286.

  When the target 310 is no longer within the predetermined range of the proximity switch 200, the magnetic force between the biasing member 206 and the contact magnet 224 (ie, the first magnetic force) is the magnetic force between the contact magnet 224 and the target 310 ( That is, the first magnetic force causes the contact magnet 224 to be displaced longitudinally from the second switch position 228 to the first switch position 226 in the manner described above.

  As previously described, the circumferential cavity surface 246a of the first body half 230a and the circumferential cavity surface 246b of the second body half 230b cooperate to form the cylindrical surface of the second cavity 240. Or at least partially define. The cylindrical surface of the second cavity 240 has any suitable diameter that allows the contact magnet 224 to be displaced longitudinally from the first switch position 226 to the second switch position 228 and vice versa. Can do. More specifically, the cylindrical surface of the second cavity 240 may be positioned when the contact magnet 224 is in the first switch position 226, in the second switch position 228, or from the second switch position 228. When longitudinally displaced to one switch position 226 (or vice versa), it may be adapted to limit or prevent movement of the contact magnet 224 in a direction perpendicular to the body longitudinal axis 204. Preferably, the diameter of the cylindrical surface of the second cavity 240 may be slightly larger (e.g., 5% to 15% larger) than the diameter of the spherical contact magnet 224.

  Those skilled in the art will appreciate that the magnetic force between target 310 and contact magnet 224 depends on several factors such as the relative size of target 310 and contact magnet 224, the distance between target 310 and contact magnet 224, and the like. It will be appreciated that, and these variables can be adjusted to provide a desired predetermined range for a particular application. In a similar manner, the magnetic force between the contact magnet 224 and the biasing member 206 can also be adjusted.

  One skilled in the art also recognizes that the disclosed embodiment of the magnetic trigger proximity switch 200 is a relatively small switch 202 having a simple activation mechanism that includes a single moving part (ie, a contact magnet 224) that operates as both an actuator and a contact. You will recognize that you are assuming. This simplified design minimizes the number of assembly components and reduces the number of assembly operations, thereby reducing manufacturing costs and assembly time. The simplified design also reduces the overall size (contact magnet 224) that allows the magnetic trigger proximity switch 200 to be used in applications with limited space requirements, such as in switchboards. Limited to the diameter of Since the magnetic trigger type proximity switch 200 is intended to be switched below a load of PLC level (for example, 5V, etc.), the contact size can be correspondingly reduced. The size can be further reduced. It will also be apparent to those skilled in the art that an external power supply is unnecessary, thereby simplifying the installation of proximity switch 200 and extending its useful life.

Although various embodiments have been described above, the present disclosure is not intended to be limited thereto. While various changes may be made to the disclosed embodiments, they are still within the scope of the appended claims. For example, two or more switching circuits (each including a biasing member 206, a contact magnet 224, and a plurality of contacts 208, 212, 216, 220) are included in one switch body 202 of the proximity switch 200. Each switching circuit can operate independently to allow the contact magnet 224 of each circuit to move from the first switch position 226 to the second switch position 228 in the manner described above. Two or more switching circuits may be positioned in a linear orientation within the switch body 202 to measure linear travel. Alternatively, two or more switching circuits may be located within the switch body 202 to allow XY target positioning (eg, positioning along the body longitudinal axis 204 and perpendicular to the body longitudinal axis 204). Can be arranged in a grid. In further embodiments, proximity switch 200 may be sealed to protect proximity switch 200 from water or dust particles or to allow proximity switch 200 to be used in hazardous locations. In addition, an LED is placed in or on a portion of the switch body 202 or body sleeve 204 to visually indicate whether the proximity switch 200 is in the first switch position 226 or the second switch position 228. Can be included.

Claims (20)

Magnetic trigger type proximity switch,
A switch body extending along the body longitudinal axis;
An urging member fixed immovably in the switch body;
A first normally closed contact having an engagement arm;
A second normally closed contact having an engagement arm;
A first normally open contact having an engagement arm;
A second normally open contact having an engagement arm;
A contact magnet disposed within the switch body and movable with respect to the biasing member such that the contact magnet is movable between a first switch position and a second switch position. A contact magnet, and
In the first switch position, the contact magnet contacts a portion of the engagement arm of the first normally closed contact and a portion of the engagement arm of the second normally closed contact, thereby causing the first switch Completing a circuit between one normally closed contact and the second normally closed contact;
In the second switch position, the contact magnet contacts a portion of the engagement arm of the first normally open contact with a portion of the engagement arm of the second normally open contact, thereby A magnetic trigger proximity switch that completes a circuit between one normally open contact and the second normally open contact.   The magnetic trigger proximity switch according to claim 1, wherein the contact magnet is spherical.   The biasing member and the contact magnet are selected to create a first magnetic force between the biasing member and the contact magnet, and the first magnetic force causes the contact magnet to move to the first switch. Maintained in position, a target outside the contact magnet and the switch body is selected to create a second magnetic force between the contact magnet and the target, wherein the second magnetic force is the first magnetic force. The magnetic trigger proximity switch according to claim 1 or 2, wherein the second magnetic force moves the contact magnet from the first switch position to the second switch position when larger than the magnetic force.   When the second magnetic force between the target and the contact magnet becomes weaker than the first magnetic force between the biasing member and the contact magnet, the first magnetic force causes the contact magnet to move. The magnetic trigger type proximity switch according to claim 1, wherein the proximity switch is moved from the second switch position to the first switch position.   The contact magnet is disposed within a cylindrical second cavity formed in the switch body, and a cylindrical surface that at least partially defines the second cavity is perpendicular to the body longitudinal axis. 5. A magnetic trigger proximity switch according to any one of claims 1 to 4, adapted to limit or prevent movement of the contact magnet in a direction.   6. The magnetic trigger proximity according to any one of claims 1 to 5, wherein the contact magnet is displaced along the body longitudinal axis between the first switch position and the second switch position. switch.   The engagement arms of each of the first normally closed contact, the second normally closed contact, the first normally open contact, and the second normally open contact have an elongated shape having a longitudinal axis. The magnetic trigger type proximity switch according to any one of claims 1 to 6.   Each of the first normally closed contact, the second normally closed contact, the first normally open contact, and the second normally open contact is in the direction parallel to the body longitudinal axis. The magnetic trigger proximity switch according to claim 1, comprising an elongated extending arm extending from the distal end of the magnetically triggered proximity switch.   The longitudinal axis of the engagement arm of each of the first normally closed contact and the second normally closed contact extends along a second reference plane perpendicular to the body longitudinal axis. Item 9. The magnetic trigger proximity switch according to any one of items 1 to 8.   A first reference plane in which the longitudinal axis of the engagement arm of each of the first normally open contact and the second normally open contact is parallel to and offset from the first reference plane The magnetic trigger type proximity switch according to claim 1, which extends along the line.   11. The biasing member is disposed adjacent to a first end of the switch body, and the first reference plane is disposed adjacent to a second end of the switch body. The magnetic trigger type proximity switch according to any one of the above.   The engagement arm of each of the first normally closed contact, the second normally closed contact, the first normally open contact, and the second normally open contact has a cylindrical shape. The magnetic trigger type proximity switch according to any one of 11.   The magnetic trigger type proximity switch according to claim 1, wherein the contact magnet is a gold-plated neodymium magnetic sphere.   14. The switch body according to claim 1, wherein the switch body includes a first body half and a second body half, and the first body half and the second body half combine to form a cylindrical shape. The magnetic trigger type proximity switch according to item 1.   15. A magnetic trigger proximity switch according to any one of claims 1 to 14, wherein the switch body is disposed within a cylindrical body sleeve.   16. A magnetic trigger proximity switch according to any one of claims 1 to 15, wherein the first body half, the second body half, and the body sleeve are made of plastic. A method of detecting a target by a magnetic trigger proximity switch,
Providing a switch body;
Placing a pair of normally closed contacts in the switch body;
Arranging a pair of normally open contacts in the switch body;
Positioning a fixed biasing member within the switch body;
Disposing a contact magnet movably adjacent to the biasing member;
Urging the contact magnet by the force of the urging member operating on the contact magnet to engage the pair of normally closed contacts;
Positioning the target in a first position outside the switch body such that the magnetic force between the target and the contact magnet is greater than the magnetic force between the biasing member and the contact magnet, thereby Disengaging from the pair of normally closed contacts and moving the contact magnet to engage the pair of normally open contacts.   Positioning the target in a second position outside the switch body such that the magnetic force between the target and the contact magnet is less than the magnetic force between the biasing member and the contact magnet, thereby The method of claim 17, further comprising moving the contact magnet so that the contact magnet disengages from the pair of normally open contacts and engages the pair of normally closed contacts.   Providing a spherical magnet as the contact magnet, and the spherical magnet with respect to the switch body when the spherical magnet is disengaged from the pair of normally closed contacts and moved to engage the pair of normally open contacts. 19. The method of claim 1, further comprising disposing the spherical magnet in a cylindrical cavity formed in the switch body to prevent or limit lateral displacement of the magnet. The method described.   The magnetic trigger type proximity switch according to claim 1, wherein the biasing member is spaced apart from the contact magnet in a longitudinal direction.