Switch

Abstract

The purpose of the present invention is to provide a switch capable of biasing an operation plate with a differential pressure plate while suppressing the inclination of the operation plate.　A switch (1) comprises: an operation plate (107) that, upon receiving an external force (F1), switches the conduction state of a switch component with an operating force (F2) corresponding to the external force (F1) by rotating around a pivot shaft (109) against a biasing force (F3); and a differential pressure plate (108) that adjusts the operating force (F2) of the operation plate (107) acting in response to the external force (F1) by biasing a biased portion (107d) of the operation plate (107), which is set apart from the pivot shaft (109), with an adjusting force (F4) acting in the opposite direction to the biasing force (F3). The differential pressure plate (108) is in contact with the biased portion (107d) of the operation plate (107) and is pivotally supported at both ends in the width direction (Y) of the operation plate (107) so as to be rotatable about the pivot shaft (109), the adjusting force (F4) is applied to the differential pressure plate, and the biased portion (107d) is biased with the adjusting force (F4).

Description

switch

[0001] The present invention relates to a switch.

[0002] Conventionally, switches used in devices and the like in machinery and the like have been known in which an external force is received by an actuating plate, which is then transmitted to a switch component to switch the conductive state of a contact (see, for example, Patent Document 1). The switch in Patent Document 1 is provided with a differential pressure plate that biases the actuating plate to adjust the operating force of the actuating plate in response to the external force. The differential pressure plate is disposed on one side of the actuating plate and is configured to bias a biased portion that extends in a branch-like manner from the side edge of the actuating plate.

[0003] China Utility Model Registration No. 211236707

[0004] However, in the switch described in the above-mentioned Patent Document 1, the biasing force of the actuating plate by the differential pressure plate is applied to one side of the actuating plate, which may result in the actuating plate being tilted. If the actuating plate is tilted, the operating force of the actuating plate adjusted by the differential pressure plate may deviate from the target setting value, which is undesirable.

[0005] An object of the present invention is to provide a switch in which the tilt of the operating plate can be suppressed and the operating plate can be biased by the differential pressure plate.

[0006] In order to solve the above problems and achieve the object, the switch comprises a switch component, an actuating plate which is a plate member rotatable about a predetermined rotation axis and biased by a biasing force in a direction opposite to a predetermined external force, and which, when subjected to the external force, rotates about the rotation axis against the biasing force to switch the conductive state of the switch component with an operating force corresponding to the external force, and a differential pressure plate which adjusts the operating force of the actuating plate in response to the external force by biasing a biased portion of the actuating plate away from the rotation axis with an adjusting force in a direction opposite to the biasing force, wherein the differential pressure plate contacts the biased portion of the actuating plate, and is supported at both ends in the width direction of the actuating plate so as to be rotatable about the rotation axis, to which the adjusting force is applied, and which biases the biased portion with the adjusting force.

[0007] According to the above switch, the differential pressure plate is supported on both ends of the width direction of the actuating plate so as to be rotatable about the same rotation axis as the actuating plate, and the biased portion of the actuating plate is biased by the applied adjustment force. Because the differential pressure plate is supported on both ends of the width direction of the actuating plate and an adjustment force is applied, tilt of the differential pressure plate due to the adjustment force is suppressed, and tilt of the actuating plate biased by this differential pressure plate is also suppressed. In other words, according to the above switch, the actuating plate can be biased by the differential pressure plate while suppressing tilt of the actuating plate.

[0008] Here, it is preferable that the differential pressure plate contacts the center of the biased portion in the width direction.

[0009] According to this configuration, the differential pressure plate comes into contact with the central portion in the width direction of the biased portion, so that the tilt of the operating plate biased by the differential pressure plate can be further suppressed.

[0010] It is also preferable that the differential pressure plate be in point contact with the biased portion.

[0011] With this configuration, even if the differential pressure plate is tilted due to the application of adjustment force, the contact with the biased portion is point contact, so the impact of the tilting of the differential pressure plate on the operating plate can be reduced.

[0012] Furthermore, the differential pressure plate has a slit that penetrates the biased portion of the operating plate and is wider than the plate thickness of the biased portion, and a part of the inner edge of the slit serves as a contact inner edge that contacts the biased portion, and it is even more preferable that the contact inner edge is an arc-shaped edge that convex toward the inside of the slit and that the arc-shaped contact inner edge makes point contact with the biased portion.

[0013] According to this configuration, the contact portion of the differential pressure plate with the biased portion of the operating plate is the arc-shaped inner contact edge of the slit, so that the differential pressure plate can be brought into effective point contact with the operating plate.

[0014] It is also preferable that the adjusting force is applied to a central portion of the differential pressure plate in the width direction.

[0015] According to this configuration, the tilt of the differential pressure plate is further suppressed by applying an adjustment force to the center of the differential pressure plate, so that the tilt of the operating plate that is biased by the adjustment force from this differential pressure plate can be further suppressed.

[0016] According to the present invention, it is possible to provide a switch in which the tilt of the operating plate can be suppressed and the operating plate can be biased by the differential pressure plate.

[0017] 2 is a diagram illustrating a switch according to an embodiment of the present invention, an exploded perspective view illustrating an attachment structure of an actuation plate and a differential pressure plate in the switch illustrated in FIG. 1, and an explanatory view illustrating an engagement relationship between the actuation plate and the differential pressure plate illustrated in FIGS.

[0018] An embodiment of the switch will be described below with reference to FIGS.

[0019] Fig. 1 is a diagram showing a switch according to one embodiment, and Fig. 2 is an exploded perspective view showing the mounting structure of the actuating plate and differential pressure plate in the switch shown in Fig. 1. Fig. 1(A) shows a side view of the switch 1, and Fig. 1(B) shows a front view of the switch 1. Note that Fig. 1 shows the switch 1 with the outermost cover removed so that the internal structure of the switch 1 can be seen. Fig. 3 is an explanatory diagram for explaining the engagement relationship between the actuating plate and differential pressure plate shown in Figs. 1 and 2.

[0020] The switch 1 according to this embodiment is used, for example, as a pressure switch for detecting the pressure of a refrigerant in a compressor of a refrigeration cycle. The switch 1 has an overall rectangular block-like appearance and includes a main body frame 101, a reinforcing plate 102, a range spring support plate 103, a differential pressure spring support plate 104, a range spring 105, and a differential pressure spring 106, all of which are enclosed within a cover (not shown). The switch 1 also includes an actuation plate 107, a differential pressure plate 108, a pivot shaft 109, an element 110, and a switch component 150. The switch 1 also includes two switch components 150 housed side by side within the main body frame 101, thereby forming a dual-type microswitch 160. Therefore, the element 110, which serves as an introduction portion for an external force F1 that switches the conductive state of the switch component 150, is also provided in a position corresponding to the two switch components 150.

[0021] In this embodiment, of the two switch components 150, one switch component 150 shown on the left side of the front view of FIG. 1B is provided with the structure shown in FIGS. 2 and 3 as a structure for switching the conduction state in response to the external force F1 from the element 110. Hereinafter, the switch 1 of this embodiment will be described, focusing on the structure for switching the conduction state for this one switch component 150. In FIGS. 1 to 3, the expansion / contraction direction of the range spring 105 and the differential pressure spring 106 is indicated by arrow Z and referred to as the "vertical direction Z." One side of the vertical direction Z is referred to as the "upper side Z1," and the other side is referred to as the "lower side Z2." Furthermore, the horizontal direction is indicated by arrows X and Y and referred to as the "front-rear direction X" and the "width direction Y," respectively. One side of the front-rear direction X is referred to as the "front side X1," and the other side is referred to as the "rear side X2." This is merely for the convenience of explanation, and does not necessarily coincide with the directions in the actual state of use of the switch 1, and does not limit the directions in the actual state of use of the switch 1.

[0022] The microswitch 160 is a roughly rectangular block-shaped switch element, and two switch components 150 are housed side by side in the width direction Y inside the main body frame 101. One of the switch components 150, shown on the left side of the front view in Fig. 1(B), is provided with a micro actuation plate 151 that receives an operating force F2 from the actuation plate 107 in response to an external force F1 from the element 110, as shown in Fig. 1(A). This micro actuation plate 151 is a strip-shaped member with one end serving as a pivot end 151a and the other end as a movable end 151b, and the conductive state of the internal switch mechanism is switched by pressing and releasing the pressing on the movable end 151b.

[0023] The element 110 is an element that deforms the internal bellows in the vertical direction Z in response to pressure changes of the pressurized fluid introduced through the joint pipe 111, and applies this deformation to the operating plate 107 as an external force F1.

[0024] The main body frame 101 is a frame member formed by bending a rectangular metal plate into a C-shape in side view, and two switch components 150 are arranged inside the main body frame 101 side by side in the width direction Y. In addition, one element 110 is attached to the side wall 101a on the lower side Z2 at a position corresponding to each switch component 150, with a coupling pipe 111 protruding outward.

[0025] The following describes the structure for switching the conduction state of one switch component 150 on the left side of FIG. 1B in the width direction Y within the main body frame 101.

[0026] 1A , the reinforcing plate 102 is a frame member formed by bending a rectangular metal plate into a C-shape in side view, and is fitted next to one switch component 150 in the width direction Y within the main frame 101. Inside this reinforcing plate 102, a range spring support plate 103, a differential pressure spring support plate 104, a range spring 105, a differential pressure spring 106, an operating plate 107, a differential pressure plate 108, and a rotating shaft 109 are arranged.

[0027] The range spring receiving plate 103 is a metal plate located next to the switch component 150 in the width direction Y within the main frame 101 and abuts against and holds the upper Z1 end of the range spring 105. The range spring receiving plate 103 is threadedly engaged with a range adjustment bolt 103a that hangs down in the vertical direction Z from the side wall 101b on the upper Z1 side of the main frame 101 inside the range spring 105 so that its position in the vertical direction Z can be adjusted. Adjusting the position of the range spring receiving plate 103 adjusts the amount of compression of the range spring 105, which is a compression spring. This adjusts the biasing force F3 applied by the range spring 105 to the operating plate 107, and as a result, adjusts the operating force F2 of the switch component 150 applied by the operating plate 107 in response to the external force F1 from the element 110.

[0028] The differential pressure spring receiving plate 104 is a metal plate located within the main frame 101, adjacent to the switch component 150 in the width direction Y and on the front side X1 of the range spring receiving plate 103 in the front-rear direction X. The differential pressure spring receiving plate 104 is connected to an upper Z1 end of the differential pressure spring 106 to hold that end. The differential pressure spring receiving plate 104 is threadedly engaged with a differential pressure adjustment bolt 104a that hangs down in the vertical direction Z from the side wall 101b on the upper Z1 of the main frame 101 inside the differential pressure spring 106 so that its position in the vertical direction Z can be adjusted. Adjusting the position of the differential pressure spring receiving plate 104 adjusts the amount of extension of the differential pressure spring 106, which is a tension spring. This increases or decreases the adjustment force F4 of the differential pressure plate 108, which is biased in the vertical direction Z by the differential pressure spring 106, relative to the operating force F2 of the operating plate 107.

[0029] The range spring 105 is a compression spring interposed between the range spring receiving plate 103 and the operating plate 107, with the range adjustment bolt 103a passing through the interior thereof. The range spring 105 urges the operating plate 107 in the opposite direction to the external force F1 from the element 110 with an urging force F3 adjusted by the range spring receiving plate 103.

[0030] The differential pressure spring 106 is a tension spring having one end connected to the differential pressure spring receiving plate 104 with the differential pressure adjustment bolt 104a passing through the interior, and the other end connected to the differential pressure plate 108. The differential pressure spring 106 applies a biasing force according to the amount of extension adjusted by the differential pressure spring receiving plate 104 as an adjustment force F4 to the operating plate 107 by pulling up the differential pressure plate 108 in the same direction as the external force F1 from the element 110.

[0031] The actuation plate 107 is a plate member that receives an external force F1 from the element 110. The actuation plate 107 is a member that switches the conductive state of the switch mechanism of the switch component 150 by pressing or releasing a movable end 151b of a micro actuation plate 151 in the switch component 150 in response to the external force F1. As shown in Fig. 2, the actuation plate 107 is formed by connecting an actuation receiving plate 107a that receives the external force F1 from the element 110 and a pressing arm 107b that presses the micro actuation plate 151 so as to form an L-shape in a side view from the width direction Y. In addition, a pair of bearing portions 107c through which a rotation shaft 109 passes in the width direction Y are provided near the connecting end of the actuation receiving plate 107a with the pressing arm 107b. The actuating plate 107 is supported by the reinforcing plate 102 at the pair of bearing portions 107c so as to be rotatable about the rotation axis formed by the rotation shaft 109. The actuating plate 107a is urged by the range spring 105 with a biasing force F3 in the opposite direction to the external force F1. When the sum of the external force F1 from the element 110 and the adjusting force F4 from the differential pressure plate 108 at the actuating plate 107a is greater than the biasing force F3 from the range spring 105, the actuating plate 107 rotates about the rotation axis formed by the rotation shaft 109 against the biasing force F3. This rotation causes the pressing arm 107b to press the movable end 151b of the micro actuating plate 151. Conversely, when the sum of the external force F1 and the adjusting force F4 is smaller than the biasing force F3 from the range spring 105, the operating plate 107 rotates in the opposite direction due to the biasing force F3, and the pressure applied by the pressing arm 107b to the micro operating plate 151 is released. By this rotation in response to the external force F1 from the element 110, the operating plate 107 switches the conductive state of the switch component 150.

[0032] The differential pressure plate 108 biases the biased portion 107d, which is located away from the pivot shaft 109 on the actuation support plate 107a of the actuation plate 107, with an adjustment force F4 in the opposite direction to the biasing force F3 from the range spring 105. This adjustment force F4 is applied by pulling up the differential pressure spring 106, as described above. Furthermore, the biased portion 107d on the actuation plate 107 is the tip end of the actuation support plate 107a on the side opposite to the pivot shaft 109. The differential pressure plate 108 adjusts the operating force F2 of the actuation plate 107 in response to the external force F1 from the element 110 by pulling up the biased portion 107d with the adjustment force F4 applied by the differential pressure spring 106. That is, the operating force F2 of the operating plate 107 on the micro operating plate 151 is adjusted to the difference between the sum of the external force F1 from the element 110 and the adjusting force F4 by the differential pressure plate 108 and the biasing force F3 from the range spring 105.

[0033] 2, the differential pressure plate 108 includes a biasing portion 108a that contacts and biases the biased portion 107d of the actuating plate 107, and a pair of pivot arms 108b. The pair of pivot arms 108b are arm portions that extend from both ends of the biasing portion 108a in the width direction Y, and each extending end 108c is passed through a pivot shaft 109, so that the pair of pivot arms 108b are pivotally supported on the reinforcing plate 102 in a double-supported state so as to be rotatable around the pivot axis formed by the pivot shaft 109.

[0034] A pair of pivot arms 108b of the differential pressure plate 108 are provided inside a pair of bearing flanges 102a provided on the reinforcing plate 102, and a pair of bearing portions 107c of the operating plate 107 are provided inside the pair of pivot arms 108b. The pivot shaft 109 is a shaft member that penetrates the pair of bearing flanges 102a, the pair of pivot arms 108b, and the pair of bearing portions 107c in the width direction Y. The pivot shaft 109 supports the operating plate 107 and the differential pressure plate 108 coaxially on the reinforcing plate 102.

[0035] In this embodiment, the biased portion 107d of the actuating plate 107 is a tongue-shaped protruding end portion at the tip end of the actuating receiving plate 107a, with the central portion in the width direction Y protruding toward the front side X1. The differential pressure plate 108 makes point contact with this biased portion 107d as shown in FIG. 3 . The biased portion 108a of the differential pressure plate 108 has a bridge portion 108d connecting the opposite ends of the pair of pivot arms 108b in the width direction Y from the extended ends 108c, and a rectangular plate-shaped biasing wall portion 108e hanging down to the lower side Z2. Furthermore, the biased portion 108a has a triangular plate-shaped pulled portion 108f extending from the central portion of the bridge portion 108d in the width direction Y to the upper side Z1. The differential pressure plate 108 has the biased portion 108a and the pair of pivot arms 108b formed by bending a flattened metal plate.

[0036] Furthermore, the biasing wall portion 108e in the biasing portion 108a of the differential pressure plate 108 is provided with a slit 108e-1 that is wider than the plate thickness of the biased portion 107d of the operating plate 107. The biased portion 107d of the operating plate 107 passes through this slit 108e-1. The inner edge of the lower side Z2, which is part of the inner edge of this slit 108e-1, serves as a contact inner edge 108e-2 that contacts the biased portion 107d. Here, the contact inner edge 108e-2 is an arc-shaped edge that convex toward the inside of the slit 108e-1. The differential pressure plate 108 comes into point contact with the biased portion 107d at a contact point P1 on this arc-shaped contact inner edge 108e-2.

[0037] The lower end hook 106a (Figure 1) of the differential pressure spring 106 is hooked into the locking hole 108f-1 provided in the pulled portion 108f extending from the center in the width direction Y of the bridge portion 108d of the biasing portion 108a, and an adjustment force F4 is applied.

[0038] According to the switch 1 of the embodiment described above, the differential pressure plate 108 is supported at both ends of the width direction Y of the actuating plate 107 and is rotatably supported around the same rotation axis 109 as the actuating plate 107. The differential pressure plate 108 biases the biased portion 107d of the actuating plate 107 by the applied adjustment force F4. Because the differential pressure plate 108 is supported at both ends and the adjustment force F4 is applied, tilt of the differential pressure plate 108 due to the adjustment force F4 is suppressed, and tilt of the actuating plate 107 biased by the differential pressure plate 108 is also suppressed. In other words, according to the switch 1 described above, the actuating plate 107 can be biased by the differential pressure plate 108 while suppressing tilt of the actuating plate 107.

[0039] In this embodiment, the differential pressure plate 108 comes into contact with the center of the biased portion 107d of the operating plate 107 in the width direction Y. With this configuration, the differential pressure plate 108 comes into contact with the center of the biased portion 107d in the width direction Y, which further reduces the inclination of the operating plate 107 biased by the differential pressure plate 108.

[0040] Furthermore, in this embodiment, the differential pressure plate 108 is in point contact with the biased portion 107d of the operating plate 107. According to this configuration, even if the differential pressure plate 108 is tilted by the application of the adjustment force F4, the contact with the biased portion 107d is point contact, and therefore the influence of the tilt of the differential pressure plate 108 on the operating plate 107 can be suppressed.

[0041] Furthermore, in this embodiment, the differential pressure plate 108 is provided with a slit 108e-1 that penetrates the biased portion 107d of the operating plate 107, and a part of the inner edge of the slit 108e-1 serves as a contact inner edge 108e-2 that contacts the biased portion 107d. This contact inner edge 108e-2 is an arc-shaped edge that convex toward the inside of the slit 108e-1, and the differential pressure plate 108 comes into point contact with the biased portion 107d at this arc-shaped contact inner edge 108e-2. According to this configuration, by making the contact portion of the differential pressure plate 108 with the biased portion 107d of the operating plate 107 the arc-shaped contact inner edge 108e-2 in the slit 108e-1, the differential pressure plate 108 can be effectively brought into point contact with the operating plate 107.

[0042] Furthermore, in this embodiment, an adjustment force F4 is applied to the center of the differential pressure plate 108 in the width direction Y. According to this configuration, the application of the adjustment force F4 to the center of the differential pressure plate 108 further reduces the tilt of the differential pressure plate 108, and therefore the tilt of the operating plate 107, which is biased by the adjustment force F4 from the differential pressure plate 108, can be further reduced.

[0043] The above-described embodiments merely show typical embodiments of the present invention, and the present invention is not limited to these. In other words, various modifications can be made without departing from the gist of the present invention. As long as such modifications still include the switch configuration of the present invention, they are of course included in the scope of the present invention.

[0044] For example, in the above-described embodiment, the switch 1 includes a dual-type microswitch 160 used as a pressure switch. In this switch 1, pressure changes in the pressurized fluid are transmitted to the actuation plate 107 via a bellows in the element 110. However, the switch is not limited to this. It may be used as various switches other than a pressure switch, as long as the actuation plate receives some kind of external force and switches the conductive state of a switch component with an operating force corresponding to the external force. Even when used as a pressure switch, the pressure change may be transmitted to the actuation plate via a member other than a bellows, such as a diaphragm. The switch type is also not limited to a dual type, and may be a single type having only one switch component.

[0045] In the above-described embodiment, one switch component 150 whose conduction state is switched via the micro-actuation plate 151 is exemplified as an example of the switch component. However, the switch component is not limited to this, and any specific switch mode is not important.

[0046] In the above-described embodiment, the differential pressure plate 108 is a bent product having the biasing portion 108a and the pair of pivot arms 108b. However, the differential pressure plate is not limited to this, and any specific shape may be used as long as it is supported by a shaft in a double-supported state.

[0047] Furthermore, in the above-described embodiment, the differential pressure plate 108 that contacts the center of the biased portion 107d of the operating plate 107 in the width direction Y is exemplified as an example of the differential pressure plate. However, the differential pressure plate is not limited to this, and may contact a position that is shifted from the center of the operating plate in the width direction. However, as described above, by having the differential pressure plate 108 contact the center of the operating plate 107 in the width direction Y, the tilt of the operating plate 107 can be further suppressed.

[0048] Furthermore, in the above-described embodiment, the differential pressure plate 108 that comes into point contact with the biased portion 107d of the operating plate 107 is exemplified as an example of the differential pressure plate. However, the differential pressure plate is not limited to this, and may come into line contact or surface contact with the operating plate. However, as described above, by bringing the differential pressure plate 108 into point contact with the operating plate 107, even if the differential pressure plate 108 were to tilt, the effect on the operating plate 107 can be suppressed.

[0049] Furthermore, in the above-described embodiment, as an example of point contact of the differential pressure plate with the actuating plate, a form in which the arc-shaped contact inner edge 108e-2 of the slit 108e-1 provided in the differential pressure plate 108 makes point contact with the biased portion 107d of the actuating plate 107 is exemplified. However, the form of point contact is not limited to this, and any specific contact form is not required. However, as described above, by making point contact with the actuating plate 107 at the arc-shaped contact inner edge 108e-2 of the slit 108e-1, it is possible to effectively bring the differential pressure plate 108 into point contact with the actuating plate 107.

[0050] Furthermore, in the above-described embodiment, the differential pressure plate 108 in which the adjustment force F4 is applied to the center in the width direction Y is exemplified as an example of a differential pressure plate. However, the differential pressure plate is not limited to this, and the adjustment force may be applied to a position shifted from the center in the width direction. However, as described above, by applying the adjustment force F4 to the center in the width direction Y, the tilt of the operating plate 107 can be further suppressed.

[0051] 1 Switch 101 Body frame 101a, 101b Side wall 102 Reinforcement plate 103 Range spring receiving plate 103a Range adjustment bolt 104 Differential pressure spring receiving plate 104a Differential pressure adjustment bolt 105 Range spring 106 Differential pressure spring 106a Lower end hook 107 Actuation plate 107a Actuation receiving plate 107b Pressing arm 107c Bearing portion 107d Forced portion 108 Differential pressure plate 108a Forced portion 108b Rotating arm 108c Extension end portion 108d Bridge portion 108e Forced wall portion 108e-1 Slit 108e-2 Contact inner edge 108f Traction portion 108f-1 Locking hole 109 Rotating shaft 110 Element 111 Joint tube 150 Switch component 151 Micro-actuating plate 151a Rotation shaft end 151b Movable end 160 Microswitch F1 External force F2 Operating force F3 Urging force F4 Adjustment force P1 Contact point X Front-rear direction X1 Front side X2 Rear side Y Width direction Z Up-down direction Z1 Upper side Z2 Lower side

Claims

1. A switch comprising: a switch component; an actuating plate which is rotatable about a predetermined rotation axis and is a plate member biased by a biasing force in the opposite direction to a predetermined external force, and which, when subjected to the external force, rotates about the rotation axis against the biasing force to switch the conductive state of the switch component with an operating force corresponding to the external force; and a differential pressure plate which biases a biased portion of the actuating plate away from the rotation axis with an adjusting force in the opposite direction to the biasing force, thereby adjusting the operating force of the actuating plate in response to the external force, wherein the differential pressure plate comes into contact with the biased portion of the actuating plate, and is rotatably supported about the rotation axis in a state where it is supported at both ends in the width direction of the actuating plate, so that the adjusting force is applied to the biased portion, and the differential pressure plate biases the biased portion with the adjusting force.

2. The switch according to claim 1, wherein the differential pressure plate contacts the center of the biased portion in the width direction.

3. The switch according to claim 1, wherein the differential pressure plate makes point contact with the biased portion.

4. The switch described in claim 3, characterized in that the differential pressure plate has a slit that penetrates the biased portion of the operating plate and is wider than the plate thickness of the biased portion, and part of the inner edge of the slit serves as a contact inner edge that contacts the biased portion, and the contact inner edge is an arc-shaped edge that convex toward the inside of the slit, and the arc-shaped contact inner edge makes point contact with the biased portion.

5. The switch according to claim 1, wherein the differential pressure plate has the adjusting force applied to a central portion of the differential pressure plate in the width direction.

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