Push switch

Abstract

The push switch (10) comprises: a reed switch (16) arranged vertically; a hollow housing (12) arranged to surround the reed switch; a first magnet (13) having a ring shape, fixedly arranged at the lower side of the housing (12) to surround the reed switch (16), and magnetized in the axial direction; a second magnet (14) having a ring shape, movably arranged at the upper side of the housing in the axial direction to surround the reed switch (16), and magnetized in the opposite direction to the first magnet (13); and a pressing member (15) mounted on the second magnet (14), and when operated downward, the second magnet (14) is moved to an operating position close to the first magnet (13), and the housing (12) is positioned relative to the reed switch (16) so that, in the housing (12), in a non-operating position where the pressing member (15) is not pressed, the contact of the reed switch (16) is located at a height at an intermediate position between the first magnet (13) and the second magnet (14) in the axial direction.

Description

Technical Field

[0001] The present invention relates to a push switch using a reed switch. Background Art

[0002] The push switch using the reed switch is configured such that the magnetic flux of the permanent magnet is applied to a pair of reeds of the reed switch to magnetize them, and the contacts are brought into contact with each other by magnetic attraction to be turned on, or the contacts of the reed are separated from each other by moving away from the permanent magnet or forming a magnetic circuit with an auxiliary magnet to be turned off. The switching between on and off can be performed by moving the permanent magnet closer to or farther from the reed switch from the outside, or by moving the permanent magnet closer to or farther from the reed switch based on the restoring force of an elastic member such as a spring, as in the micro switch mechanism disclosed in Patent Document 1.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent document 1: Japanese Utility Model Application Laid-Open No. 61-49933. Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in a push switch using a known reed switch, in the on state, only one reed is magnetized by the permanent magnet, but the other reed is not magnetized by the permanent magnet, so there is a possibility that the on state cannot be stably maintained, and in the off state, the reed loses its magnetism and becomes off. Therefore, the known push switch becomes unstable in both the on state and the off state due to the influence of, for example, an external magnetic field or vibration, and the reliability is reduced when it functions as a push switch.

[0008] In the push switch using the reed switch, an elastic member for returning the operated permanent magnet to its original position and a member for supporting the elastic member are required, and therefore mechanical durability of the elastic member is also required.

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a push switch using a reed switch having high reliability and durability with a simple structure.

[0010] Means used to solve problems

[0011] In order to achieve the above object, the push switch of the present invention comprises:

[0012] a reed switch configured such that its central axis extends in a vertical direction;

[0013] a base, housing the reed switch;

[0014] a hollow housing enclosing the reed switch around the central axis and supported by the base;

[0015] The first magnet has a circular ring shape, is fixedly disposed on the axial lower side of the housing to surround the reed switch around the central axis, and is magnetized in the axial direction;

[0016] a second magnet having a circular ring shape, disposed axially movably on an axial upper side in the housing to surround the reed switch around the central axis, and magnetized in a direction opposite to that of the first magnet; and

[0017] The pressing component is mounted on the second magnet. When the first magnet is in a non-operating position away from the second magnet by a repulsive force between the first magnet and the second magnet, a part of the pressing component protrudes upward from the axial upper end of the housing. When the pressing component is operated downward, the second magnet moves to an operating position close to the first magnet.

[0018] The housing is positioned relative to the reed switch so that, in the non-actuated position, the contact of the reed switch is located between the first magnet and the second magnet in the axial direction of the housing.

[0019] Preferably, the housing is positioned relative to the reed switch so that in the non-actuated position, the contacts of the reed switch are located in the center between the first magnet and the second magnet (eg Figure 5 ). When the pressing member is not pressed, the second magnet is in the non-actuated position, and the two magnets are opposite to each other with the same polarity. Therefore, the two reeds of the reed switch are also magnetized to the same polarity by the magnetic field of the corresponding magnets. Therefore, the two reeds of the reed switch are separated from each other due to the repulsive force, so the reed switch is disconnected. At this time, the two reeds of the reed switch are magnetized by the corresponding magnets and repel each other, so that the disconnected state can be stably maintained and is not easily affected by external magnetic fields or vibrations.

[0020] In contrast, when the pressing member is pressed, the second magnet moves to an operating position close to the first magnet and moves to the vicinity of the contact of the reed switch. As a result, the lower reed of the reed switch remains magnetized by the first magnet, but the upper reed is magnetized to a different polarity by the second magnet. The two reeds are magnetized to different polarities, and the two reeds are magnetized to different polarities. The two reeds attract each other, causing the reed switch to be turned on (such as Figure 6As shown). The two reeds of the reed switch are magnetized and attracted to each other by the magnetic influence of the corresponding magnets, and can stably maintain the on state and are not easily affected by external magnetic fields or vibrations. The push switch functions as a normally open push switch. This normally open push switch is also called a contact. In the normally open push switch, when the hand leaves the pressing part, the second magnet and the pressing part move upward due to the magnetic repulsion generated between the first magnet and the second magnet and return to the non-acting position. Therefore, there is no need for an elastic component or the like for returning the second magnet and the pressing part to the non-acting position.

[0021] In the above structure, the housing is positioned relative to the reed switch so that in the actuated position, the vicinity of the contact of the reed switch is axially located near the center between the first magnet and the second magnet (such as Fig. 9 As shown). When the pressing component is not pressed, the second magnet is in the non-actuated position, the two magnets are separated from each other with the same polarity, and the second magnet is located away from the contact of the reed switch. Therefore, the reed switch is only subjected to the magnetic force of the first magnet close to the contact, and the upper and lower reeds near the contact of the reed switch are magnetized to different polarities, so the two reeds are in contact with each other through magnetic attraction, becoming connected (as shown). Figure 8 As shown in the figure, the two reeds of the reed switch are magnetized by the magnetism of the corresponding magnets and contact each other, so that the switch can be stably connected and is not easily affected by external magnetic fields or vibrations. In this way, the push switch functions as a normally closed push switch, also known as a b contact.

[0022] In a normally closed push switch, when the push component is manually pressed, the second magnet moves to an actuating position close to the first magnet and moves to the vicinity of the contact of the reed switch. As the second magnet approaches, the magnetic poles of the upper reed near the contact reverse to the same polarity as the magnetic poles of the lower reed. Therefore, the two reeds are separated from each other by magnetic repulsion, and the reed switch is disconnected (e.g. Fig. 9 As shown in the figure, the two reeds of the reed switch are separated from each other by the magnetic influence of the corresponding magnets, so that the disconnected state can be stably maintained and is not easily affected by external magnetic fields or vibrations.

[0023] Here, when the hand leaves the pressing member, the second magnet and the pressing member move upward due to the magnetic repulsion between the first magnet and the second magnet and return to the inactive position. Therefore, an elastic member or the like is not required to return the second magnet and the pressing member to the inactive position.

[0024] In the present invention, preferably, it is possible to selectively position in any one of a first position and a second position, wherein the first position refers to a non-actuated position in which the contact of the reed switch is located near the center between the first magnet and the second magnet, and the second position refers to an actuated position in which the contact of the reed switch is located near the center between the first magnet and the second magnet (e.g. Figures 3 to 6 In this embodiment, the base has two cutouts, which have different heights and are alternately arranged at equal angles on the outer periphery of the base. The housing has two cutouts at its lower end, which have different heights and are located at positions corresponding to the cutouts of the base. The cutouts of the base and the cutouts of the housing are respectively abutted to selectively position the housing in the first position and the second position. In this embodiment, when the housing is in the first position relative to the reed switch, the housing acts as a normally open push switch (such as Figure 5 and Figure 6 In contrast, when the housing is in the second position relative to the reed switch, it functions as a normally closed push switch (as shown in FIG. Figure 8 and Fig. 9 If the housing can be selectively positioned at the first position or the second position relative to the reed switch, one push switch can be used as both a normally open push switch and a normally closed push switch. Even if two types of push switches, normally open and normally closed, are not prepared separately, one push switch can be used for both.

[0025] Preferably, a magnet (such as Figure 7 In the above-mentioned push switch capable of switching between normally open and normally closed types, a magnet is arranged at the part of the base that contacts the first magnet, so that the base 11 can be prevented from falling off from the housing by utilizing the attraction force of the first magnet built into the housing 12. In order to increase the attraction force, a magnet can also be used as a magnet.

[0026] Effects of the Invention

[0027] According to the present invention, it is possible to provide a push switch using a reed switch having high reliability and durability with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the push switch of the first embodiment.

[0029] Figure 2 yes Figure 1 A top view of a push switch.

[0030] Figure 3 yes Figure 2 AA line cross-sectional view of the push switch.

[0031] Figure 4 yes Figure 1 A three-dimensional image of a magnet used in a push switch.

[0032] Figure 5 This is a simplified cross-sectional view of a normally open push switch in the non-actuated state.

[0033] Figure 6 yes Figure 5 A simplified cross-sectional diagram of the operating state of a push switch.

[0034] Figure 7 yes Figure 1 Front view of the push switch when used as a normally closed type.

[0035] Figure 8 yes Figure 7 A simplified cross-sectional view of a normally closed push switch in the non-actuated state.

[0036] Fig. 9 yes Figure 8 A simplified cross-sectional diagram of the operating state of a normally closed push switch.

[0037] Fig.10 It is a front view of the push switch of the second embodiment.

[0038] Fig.11 yes Fig.10 A top view of a push switch.

[0039] Fig.12 yes Fig.11 BB line cross-sectional view of the push switch.

[0040] Fig.13 It is a front view of the push switch of the third embodiment.

[0041] Fig.14 yes Fig.13 A top view of a push switch.

[0042] Fig.15 yes Fig.14 CC line cross-sectional view of the push switch. DETAILED DESCRIPTION

[0043] Hereinafter, the embodiments of the present invention will be described in detail based on the drawings, but the scope of the present invention is not limited to the embodiments and can be appropriately changed. In each of the drawings, the same or corresponding components are denoted by the same reference numerals.

[0044] (First Embodiment)

[0045] right Figures 1 to 9The first embodiment shown in FIG. 1 is described in detail. The push switch 10 of this embodiment includes a base 11, a housing 12, a first magnet 13, a second magnet 14, a push member 15, and a reed switch 16. The housing 12 is supported by the main body 11a of the base 11 and engages with the reed switch accommodating portion 11b of the base 11 from the outside. The first magnet 13 has a circular ring shape and is fixed to the main body 11a of the base 11 in the housing 12. The second magnet 14 has a circular ring shape and is accommodated in the housing 12. The push member 15 protrudes upward from the housing 12. The reed switch 16 is supported by the base 11 and accommodated in the housing 12.

[0046] The base 11 is made of a non-magnetic material such as a resin material or aluminum, and accommodates a reed switch 16. As shown in the figure, the base 11 includes a main body 11a and a reed switch accommodating portion 11b, the main body 11a has a roughly cylindrical shape, and the reed switch accommodating portion 11b extends upward from the center of the upper surface of the main body 11a along the central axis O of the base, and has a cylindrical shape. The reed switch accommodating portion 11b has a hollow structure that passes downward along the above-mentioned central axis O, accommodates the reed switch 16 inside, and leads the leads 16c and 16d of the reed switch 16 from the bottom to the outside. The leads 16c and 16d are made of non-magnetic materials such as copper and aluminum. The top ends of a pair of reeds 16a and 16b that are closed by contacting each other through an external magnetic field described later are called contacts.

[0047] The base 11 has two cutouts 11c and 11d, which have different heights and are alternately arranged at equal angles on the outer periphery of the base 11. The cutouts 11c and 11d are provided to limit two height positions of the housing 12, such as Figure 2 As shown, the circumferential direction is arranged alternately at approximately 90 degrees, and as Figure 3 and Figure 8 As shown, they have different depths, such as Figure 3 As shown, a cutout portion 11c has a depth d1. Figure 8 As shown, the other cutout portion 11d has a depth d2, and one cutout portion 11c is deeper than the other cutout portion 11d (d2<d1).

[0048] The housing 12 is made of a non-magnetic material such as a resin material or aluminum, and is formed into a hollow cylindrical shape around the central axis O, and has a through hole 12a at the center of its upper end. The housing 12 has an annular flange portion 12b protruding toward the inside near its lower end. The inner edge of the flange portion 12b has a diameter slightly larger than the outer diameter of the reed switch accommodating portion 11b of the base 11. The hollow housing 12 is supported by the base 11 and is configured to surround the reed switch 16 around its central axis. The housing 12 is positioned relative to the reed switch 16: in the housing 12, in the non-operating position where the pressing member 15 is not pressed, the contacts of the reeds 16a and 16b of the reed switch 16 are located in the middle between the first magnet 13 and the second magnet 14 relative to the axial direction. Among them, the center axis O of the base 11 is actually consistent with the center axis of the reed switch 16. The respective center axes of the reed switch 16, the housing 12, the first magnet 13 and the second magnet 14 are consistent with the center axis of the base 11 and can be called the center axis of the push switch 10 of the present invention.

[0049] Furthermore, the housing 12 has a cutout portion 12c at its lower end for positioning purposes, and the cutout portion 12c corresponds to the cutout portion 11d of the base 11. Figures 1 to 3 In the state shown, the cutout 12c of the housing 12 abuts against the upward end surface of the cutout 11c in the base 11 to limit the height position. Thus, the housing 12 is positioned at the first position relative to the base 11 and the reed switch 16.

[0050] On the other hand, if the housing 12 is rotated about 90 degrees around the central axis O from the state shown in the figure and fitted on the base 11, as described later, Figure 7 and Figure 8 As shown in FIG. 1 , the lower surface of the housing 12 abuts against the cutout portion 11d of the base 11. As a result, the housing 12 is positioned at the second position relative to the base 11 and the reed switch 16. In the second position, in the non-operating state, the first magnet 13 in the housing 12 is arranged at a position closer to the center of the reed switch 16, and the second magnet 14 is arranged at a position away from the center of the reed switch 16 (see FIG. 1 ). Figure 8 ).

[0051] like Figure 4 As shown, the first magnet 13 is a permanent magnet such as ferrite or neodymium, formed into a flat annular shape, and magnetized in the axial direction. The first magnet 13 is selected so that its outer diameter is smaller than the inner diameter of the housing 12, and its inner diameter is larger than the outer diameter of the reed switch accommodating portion 11b of the base 11, so that the first magnet 13 can move smoothly in the housing 12 along the direction of the central axis O. The lower surface of the first magnet 13 is installed in the housing 12 and fixed in the housing 12 as a whole.

[0052] The second magnet 14 has the same structure as the first magnet 13, such as Figure 4 As shown, the magnetization direction is configured to be reversed up and down relative to the first magnet 13. The upper side of the first magnet 13 is magnetized to the N pole, and the lower side is magnetized to the S pole, and the lower side of the second magnet 14 is magnetized to the N pole, and the upper side is magnetized to the S pole. The second magnet 14 is fixed to the lower surface of the flange portion of the pressing member 15, and moves up and down together with the pressing member 15.

[0053] The pressing member 15 is made of a non-magnetic material such as a resin material or aluminum, and includes a main body 15a and a protrusion 15b. The main body 15a is a flat hollow cylindrical shape, and the protrusion 15b extends upward from the center of the upper surface of the main body 15a along the central axis O. The main body 15a of the pressing member 15 has a diameter smaller than the inner diameter of the housing 12, and its lower surface is attached to the upper surface of the second magnet 14 by bonding or the like. The protrusion 15b of the pressing member 15 passes through the through hole 12a at the upper end of the housing 12 and is exposed to the outside.

[0054] The first magnet 13 and the second magnet 14 are magnetized in opposite directions to each other, thereby generating a magnetic repulsion force between the first magnet 13 and the second magnet 14. Figure 3 As shown, the second magnet 14 is held in the non-actuated position by the above-mentioned repulsive force.

[0055] In the non-operating position, the protrusion 15b of the pressing member 15 is in a state of fully protruding from the upper surface of the housing 12. In the non-operating position, the upper surface of the flange portion of the main body 15a abuts against the inner side of the upper surface of the housing 12, thereby limiting the upward movement of the pressing member 15 and the second magnet 14. When the protrusion 15b of the pressing member 15 is pressed downward, the pressing member 15 and the second magnet 14 move downward against the repulsive force, and the lower surface of the second magnet 14 can move to a position abutting against the upper surface of the first magnet 13, that is, the operating position.

[0056] The reed switch 16 is arranged in the reed switch accommodating portion 11b of the base 11 so that its length direction is along the central axis O, and its pair of reeds 16a, 16b are located near the central axis O, and have leads 16c, 16d extending from the reeds 16a, 16b to the outside.

[0057] like Figure 3 As shown, when the housing 12 is located at the first position relative to the base 11, the center of the reed switch 16 is arranged at a height position h corresponding to the center position in the axial direction of the first magnet 13 and the second magnet 14 in the non-operating state (refer to Figure 3 ). On the other hand, Figure 8As shown, when the housing 12 is in the second position relative to the base 11, the first magnet 13 is arranged at a position closer to the reed switch 16 in the direction of the center axis O, and the second magnet 14 is arranged at a position farther from the reed switch 16 in the direction of the center axis O.

[0058] First, in the push switch 10 according to the embodiment of the present invention, the Figure 5 and Figure 6 The case where the housing 12 is located at the first position relative to the base 11 is described. The lower surface periphery of the housing 12 abuts against the deep end surface of the cutout portion 11c of the base 11, so that when the housing 12 is located at the first position relative to the base 11, when the pressing member 15 is not pressed, Figure 5 As shown, the second magnet 14 is pushed upward by the repulsive force between the first magnet 13 and the second magnet 14, and is in the non-operating position. At this time, the contact point, that is, the center of the reed switch 16 is located at a high position h corresponding to the middle position in the length direction of the first magnet 13 and the second magnet 14.

[0059] In this case, the lower reed 16a of the reed switch 16 is magnetized to the N pole by the magnetic influence of the first magnet 13, and the upper reed 16b is magnetized to the N pole by the magnetic influence of the second magnet 14. Therefore, since the reeds 16a and 16b of the reed switch are magnetized to the same polarity, they are magnetically repelled and separated from each other, so the reed switch 16 is turned off. At this time, the two reeds 16a and 16b are magnetized by the first magnet 13 and the second magnet 14 respectively, and the contacts are separated, so the disconnected state can be stably maintained and is not easily affected by external magnetic fields or vibrations.

[0060] like Figure 6As shown, if the protrusion 15b of the pressing member 15 is pressed from the non-actuating position, the second magnet 14 and the pressing member 15 resist the repulsive force acting on the first magnet 13 and move to the action position close to the first magnet 13. In this action position, the second magnet 14 is located near the contact points of the reeds 16a and 16b of the reed switch 16. Therefore, the lower reed 16a of the reed switch 16 is magnetized and maintained as the N pole by the magnetic influence of the second magnet 14 in addition to the first magnet 13. On the other hand, the upper reed 16b is magnetized by the magnetic influence of the second magnet 14 and changes from the N pole to the S pole. As a result, since the reeds 16a and 16b of the reed switch are magnetized to different polarities, they are magnetically attracted and contact each other, so that the reed switch 16 is turned on. The two reeds 16a and 16b are magnetized by the first magnet 13 and the second magnet 14 respectively, so that they can stably maintain the turned-on state and are not easily affected by external magnetic fields or vibrations. In the above embodiment, when the housing 12 is located at the first position relative to the base 11, the reed switch 16 is turned off in the non-actuated position and turned on in the actuated position where the pressing member 15 is pressed, thereby performing a so-called normally open function.

[0061] Next, refer to Figure 8 and Fig. 9 , the case where the housing 12 is located at the second position relative to the base 11 is described. In the second position, in the housing 12 placed on the cutout 11d having a shallow depth (d2), the first magnet 13 is located slightly below the center of the reed switch 16, and when the pressing member 15 is not pressed, Figure 8 As shown, the second magnet 14 is pushed upward by the repulsive force between the first magnet 13 and is in a non-actuated position. The first magnet 13 is located slightly below the center (contact point) of the reed switch 16, while the second magnet 14 is located upward away from the center of the reed switch 16.

[0062] As a result, the lower reed 16a of the reed switch 16 is magnetized to the S pole by the magnetic influence of the first magnet 13, and the upper reed 16b is magnetized to the N pole by the magnetic influence of the first magnet 13. Therefore, since the reeds 16a and 16b of the reed switch are magnetized to different polarities, they are magnetically attracted and contact each other, so the reed switch 16 is turned on. In the second position, when the pressing member 15 is in the non-operating state, the two reeds 16a and 16b are magnetized only by the magnetic force of the first magnet 13, and can stably maintain the turned-on state, and are not easily affected by external magnetic fields or vibrations.

[0063] like Fig. 9As shown in FIG. 1 , if the protrusion 15b of the pressing member 15 is pressed from the non-actuating position, the second magnet 14 and the pressing member 15 resist the repulsive force acting on the first magnet 13 and move to the action position close to the first magnet 13. In this action position, the first magnet 13 and the second magnet 14 are simultaneously located near the contact points of the reeds 16a and 16b of the reed switch 16. Therefore, the lower reed 16a is affected by the magnetism of the N pole of the second magnet 14 and changes from the S pole to the N pole, and the upper reed 16b is affected by the magnetism of the first magnet 13 and is magnetized and maintained as the N pole.

[0064] In this way, since the reeds 16a and 16b are magnetized to the same polarity and magnetically repel each other and separate, the reed switch 16 is turned off. The two reeds 16a and 16b are magnetized by the first magnet 13 and the second magnet 14 respectively, so that the disconnected state can be stably maintained and is not easily affected by the magnetic field or vibration from the outside. Therefore, when the housing 12 is located at the second position relative to the base 11, the reed switch 16 is turned on in the non-operating position and turned off in the operating position, and the so-called normally closed function is exerted.

[0065] In the above-mentioned push switch 10, a magnet may also be provided at the position of the base 11 that contacts the first magnet 13. Specifically, a magnet 17 may also be installed on the upward end surface of the cutouts 11c and 11d of the base 11. In this case, the magnet 17 is attracted by the magnetic attraction of the first magnet 13 and contacts the cutout 12c or 12d of the housing 12, and the first and second positions of the normally open type and the normally closed type are easily maintained by the combination of the magnet 17 and the first magnet 13. The magnet 17 is arranged on the base 11 of the push switch 10 for switching between the normally open type and the normally closed type of the present invention, so that the base 11 can be prevented from falling off from the housing 12 by utilizing the attraction of the first magnet 13 built into the housing 12. The magnet 17 can be made of not only a magnetic sheet, but also a magnet to increase the attraction, which can prevent the base 11 from falling off from the housing 12 and enable switching between the normally open type and the normally closed type.

[0066] (Second Embodiment)

[0067] Reference Figures 10 to 12A push switch according to a second embodiment of the present invention will be described. The push switch 20 has the same structure as the first embodiment except for the base 11A and the housing 12A. The push switch 20 is configured such that the housing 12A is located at a first position relative to the base 11A, similarly to the push switch 10. However, unlike the first embodiment, there is no second position. In the base 11A, the cutout portion 11c' is arranged on the entire circumference of the main body 11a. The housing 12A has a cutout portion 12c' at its lower end, which corresponds to the cutout portion 11c' of the base 11A. If the housing 12A is fitted onto the base 11A around the central axis O, the lower surface of the housing 12A abuts against the cutout portion 11c' of the base 11A. As a result, the housing 12A is positioned at the first position of the above-mentioned push switch 10 relative to the base 11A and the reed switch 16.

[0068] The push switch 20 of the second embodiment is the same as the first embodiment, and the housing 12A is positioned relative to the reed switch 16 so that in the non-actuated position, the contact of the reed switch 16 is located near the center between the first magnet 13 and the second magnet 14. Fig.12 As shown, the push switch 12A is in the non-actuated position, the reed switch 16 is disconnected (always open), and when the push member 15 is manually pressed in the action position, it becomes connected in the same manner as the push switch 10 (refer to Figure 6 ).

[0069] Like the push switch 10 in which the housing 12 is located at the first position relative to the base 11 , the push switch 20 can stably maintain the OFF state and the ON state of the reed switch 16 and is not easily affected by external magnetic fields, vibrations, etc.

[0070] (Third Embodiment)

[0071] Reference Figures 13 to 15 A push switch according to a third embodiment of the present invention is described. The push switch 30 has the same structure as the first embodiment except for the base 11B and the housing 12B. The push switch 30 is constructed in the same manner as the push switch 10, with the housing 12B being located at the second position relative to the base 11B. However, unlike the first embodiment, there is no first position. In the base 11B, the cutout portion 11d' is arranged on the entire circumference of the main body 11a. The housing 12B has a cutout portion 12d' at its lower end, which corresponds to the cutout portion 11d' of the base 11A. If the housing 12B is fitted onto the base 11B around the central axis O, the lower surface of the housing 12B abuts against the cutout portion 11d' of the base 11B. As a result, the housing 12B is positioned at the second position of the above-mentioned push switch 10 relative to the base 11B and the reed switch 16.

[0072] The push switch 30A of the third embodiment is the same as the first embodiment, and the housing 12B is positioned relative to the reed switch 16 so that in the actuated position, the contact of the reed switch 16 is located near the center between the first magnet 13 and the second magnet 14. Therefore, the push switch 30 is always closed like the push switch 10, that is, in the non-actuated position, the reed switch 16 is turned on (refer to Fig.15 ), when the pressing member 15 is manually pressed to the non-actuating position, the reed switch 16 is disconnected (refer to Fig. 9 ). This push switch 30 is similar to the push switch 10 in which the housing 12 is located at the second position relative to the base 11, and can stably maintain the on state and the off state of the reed switch 16, and is not easily affected by external magnetic fields, vibrations, etc.

[0073] The present invention can be implemented in various ways within the scope of the present invention. For example, the outer peripheral surface of the reed switch housing portion 11b of the base 11 may not be formed into a cylindrical shape but into other shapes. The inner peripheral surface of the housing 12 is formed into a cylindrical shape, but is not limited thereto and may be formed into other shapes. The outer peripheral surface of the reed switch housing portion 11b and the inner peripheral surface of the housing 12 may be in any shape as long as the second magnet 14 and the pressing member 15 can freely move up and down in the area between them along the central axis O.

[0074] The push switches 10 , 20 , 30 of the present invention can be widely used in the fields of machine tools and various manufacturing equipment, and are not limited to being installed in a vertical direction, but can also be installed in a horizontal direction.

[0075] In the first embodiment described above, the cutouts 11c and 11d on the upper side of the outer peripheral surface of the base 11 and the cutout 12c at the lower end of the housing 12 are alternately arranged in the circumferential direction within an angle range of approximately 90 degrees, but not limited to this, and a locking unit of any shape may be provided as long as the first position and the second position of the housing 12 relative to the base 11 can be limited within a predetermined angle or angle range around the central axis O of the housing 12 relative to the base 11. In the first embodiment described above, in the operating position, the lower surface of the second magnet 14 abuts against the upper surface of the first magnet 13, but not limited to this, and a predetermined interval may be maintained.

[0076] In the push switches 20 and 30 of the second and third embodiments described above, the magnets 17 may be provided on the upward end surfaces of the cutouts 11 c ′ and 11 d ′ of the bases 11A and 11B, similarly to the push switch 10 .

[0077] Explanation of symbols

[0078] 10, 20, 30 push switch

[0079] 11, 11A, 11B Base

[0080] 11a Main body

[0081] 11b Reed switch housing

[0082] 11c, 11c', 11d, 11d' cutouts

[0083] 12 Housing

[0084] 12a Through hole

[0085] 12b Flange

[0086] 12c, 12c', 12d, 12d' incision

[0087] 13. First Magnet

[0088] 14 Second Magnet

[0089] 15 Pressing parts

[0090] 15a Main body

[0091] 15b Protrusion

[0092] 16 Reed switch

[0093] 16a, 16b reed

[0094] 16c, 16d lead

[0095] 17 Magnet

Claims

1. A push switch, comprising: a reed switch configured such that its central axis extends in a vertical direction; a base, accommodating the reed switch; a hollow housing configured to enclose the reed switch about the central axis and supported by the base; A first magnet having a circular ring shape, fixedly disposed at the axial lower side of the housing to surround the reed switch around the central axis, and magnetized in the axial direction; a second magnet having a circular ring shape, disposed movably in the axial direction on the axial upper side of the housing to surround the reed switch around the central axis, and magnetized in a direction opposite to that of the first magnet; as well as A pressing component is mounted on the second magnet, and when the first magnet is at a non-operating position away from the second magnet by a repulsive force between the first magnet and the second magnet, a part of the pressing component protrudes upward from the axial upper end of the housing, and when the pressing component is operated downward, the second magnet is moved to an operating position close to the first magnet. The housing is positioned relative to the reed switch such that, in the non-actuated position, the contact of the reed switch is located between the first magnet and the second magnet in the axial direction of the housing, The housing is selectively positionable in either a first position or a second position relative to the base and the reed switch, The first position refers to the non-actuated position in which the contact of the reed switch is located at the center between the first magnet and the second magnet in the axial direction. The second position refers to the actuating position in which the contact of the reed switch is located at the center between the first magnet and the second magnet in the axial direction. The base has two cutouts, which have different heights and are alternately arranged at equal angle intervals on the outer periphery of the base. The housing has two cutouts at its lower end, the two cutouts have different heights and are located at positions corresponding to the cutouts of the base. The cutout portion of the base and the cutout portion of the housing are respectively abutted against each other, so as to be selectively positioned at the first position and the second position.

2. The push switch according to claim 1, wherein: The base has a magnet at a location that contacts the first magnet.

3. The push switch according to claim 1, wherein: The base includes a magnet, and the magnet is attracted by the first magnet built in the housing.

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