Switch

Abstract

To provide a switch which can suppress inclination of an operation plate so that the operation plate can be energized by a differential pressure plate.SOLUTION: A switch 1 comprises: an operation plate 107 which rotates, upon receiving external force F1, around a rotary shaft 109 against energizing force F3, thereby switching a conduction state of a switch component with operation force F2 corresponding to the external force F1; and a differential pressure plate 108 which energizes an energized portion 107d, located away from the rotary shaft 109 on the operation plate 107, with adjustment force F4 in a direction reverse to the biasing force F3, thereby adjusting the operation force F2 on the operation plate 107 with respect to the external force F1. While coming into contact with the energized portion 107d on the operation plate 107, the differential pressure plate 108 is pivotally supported around the rotary shaft 109 in a manner held at both ends in a width direction Y of the operation plate 107 and is imparted with the adjustment force F4, thereby energizing the energized portion 107d with the adjustment force F4.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a switch.

Background Art

[0002] Conventionally, as a switch used in devices such as equipment, a switch is known that receives an external force with an operating plate, transmits it to switch components, and switches the conduction state of contacts (see, for example, Patent Document 1). The switch of this Patent Document 1 is provided with a differential pressure plate that adjusts the operating force of the operating plate with respect to the external force by biasing the operating plate. This differential pressure plate is arranged on one side of the operating plate and is configured to bias a biased portion that extends in a branched shape from the side edge of the operating plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the switch described in the above-mentioned Patent Document 1, the biasing of the operating plate by the differential pressure plate is performed on one side of the operating plate, and as a result, the operating plate may be in a tilted state. If the operating plate tilts, there is a risk that the operating force of the operating plate adjusted by the differential pressure plate will deviate from the target set value, which is not desirable.

[0005] An object of the present invention is to provide a switch that can suppress the tilt of the operating plate and bias the operating plate with a differential pressure plate.

Means for Solving the Problems

[0006] In order to solve the above problems and achieve the object, the switch includes a switch component and a plate member that is provided rotatable about a predetermined rotation axis and biased by a biasing force opposite to a predetermined external force. When the external force is received, the plate member rotates about the rotation axis against the biasing force, and by this operation force corresponding to the external force, an operating plate that switches the conduction state of the switch component, and a differential pressure plate that adjusts the operation force of the operating plate with respect to the external force by biasing a biased portion away from the rotation axis in the operating plate with an adjustment force opposite to the biasing force. The differential pressure plate contacts the biased portion of the operating plate and is pivotally supported so as to be rotatable about the rotation axis in a both-end supported state in the width direction of the operating plate and is given the adjustment force, and biases the biased portion with the adjustment force.

[0007] According to the above switch, the differential pressure plate is pivotally supported so as to be rotatable about the same rotation axis as the operating plate in a both-end supported state in the width direction of the operating plate, and biases the biased portion in the operating plate with the applied adjustment force. Since the differential pressure plate is supported in a both-end supported state in the width direction of the operating plate and the adjustment force is applied, the inclination of the differential pressure plate due to the adjustment force is suppressed, and the inclination of the operating plate biased by this differential pressure plate is also suppressed. That is, according to the above switch, the inclination of the operating plate can be suppressed and the operating plate can be biased by the differential pressure plate.

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

[0009] According to this configuration, since the differential pressure plate contacts the central portion in the width direction of the biased portion, the inclination of the operating plate biased by the differential pressure plate can be further suppressed.

[0010] Further, it is preferable that the differential pressure plate makes point contact with the biased portion.

[0011] According to this configuration, even if the differential pressure plate is inclined due to the application of the adjustment force, since the contact with the biased portion is point contact, the influence on the operating plate due to the inclination of the differential pressure plate can be suppressed.

[0012] Further, the differential pressure plate is provided with a slit that penetrates the energized portion of the actuating plate and is wider than the plate thickness of the energized portion, and a part of the inner edge of the slit contacts the energized portion as a contact inner edge, and it is more preferable that the contact inner edge is an arcuate edge convex toward the inside of the slit and makes point contact with the energized portion at the arcuate contact inner edge.

[0013] According to this configuration, by making the contact portion of the differential pressure plate with respect to the energized portion of the actuating plate the arcuate contact inner edge in the slit, the differential pressure plate can be effectively brought into point contact with the actuating plate.

[0014] Further, it is preferable that the adjusting force is applied to the central portion in the width direction of the differential pressure plate.

[0015] According to this configuration, by applying the adjusting force to the central portion of the differential pressure plate, the inclination of the differential pressure plate can be further suppressed, so that the inclination of the actuating plate energized by the adjusting force from this differential pressure plate can be further suppressed.

Advantages of the Invention

[0016] According to the present invention, it is possible to provide a switch capable of suppressing the inclination of the actuating plate and energizing the actuating plate with a differential pressure plate.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0018] Hereinafter, an embodiment of the switch will be described with reference to FIGS. 1 to 3.

[0019] FIG. 1 is a diagram showing a switch according to an embodiment, and FIG. 2 is an exploded perspective view of the mounting structure of the operating plate and the differential pressure plate in the switch shown in FIG. 1. A side view of the switch 1 is shown in FIG. 1(A), and a front view of the switch 1 is shown in FIG. 1(B). In FIG. 1, the switch 1 is shown in a state where the outermost cover is 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 operating plate and the differential pressure plate shown in FIGS. 1 and 2.

[0020] The switch 1 according to the present 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-shaped appearance, and inside a cover (not shown), it includes a main body frame 101, a reinforcing plate 102, a range spring receiving plate 103, a differential pressure spring receiving plate 104, a range spring 105, and a differential pressure spring 106. Further, the switch 1 includes an operating plate 107, a differential pressure plate 108, a rotation shaft 109, an element 110, and switch components 150. In this switch 1, two switch components 150 are arranged side by side inside the main body frame 101 to form a dual-type microswitch 160. Therefore, the element 110, which is an introduction portion of the external force F1 for switching the conduction state of the switch component 150, is also provided at positions corresponding to the two switch components 150.

[0021] Here, in the present embodiment, for one of the two switch components 150 shown on the left side of the front view in Fig. 1(B), a structure for switching the conduction state in response to the external force F1 from the element 110 is provided as the structure shown in Figs. 2 and 3. Hereinafter, regarding the switch 1 of the present embodiment, an explanation will be given focusing on the switching structure of the conduction state for this one switch component 150. In Figs. 1 to 3, the expansion and contraction directions of the range spring 105 and the differential pressure spring 106 are indicated by the arrow Z and are denoted as the "vertical direction Z". And one side in the vertical direction Z is denoted as the "upper side Z1" and the other side is denoted as the "lower side Z2". Also, the horizontal directions are indicated by the arrows X and Y and are denoted as the "front-rear direction X" and the "width direction Y", respectively. And one side in the front-rear direction X is denoted as the "front side X1" and the other side is denoted as the "rear side X2". This is merely for the convenience of explanation and does not necessarily match the directions in the actual use state of the switch 1, and does not limit the respective directions in the actual use state of the switch 1.

[0022] The microswitch 160 is a switch element in a generally rectangular block shape, and two switch components 150 are arranged side by side in the width direction Y inside the main body frame 101. Among them, one switch component 150 shown on the left side of the front view in Fig. 1(B) is provided with a micro operating plate 151 that receives the operating force F2 corresponding to the external force F1 from the element 110 from the operating plate 107 as shown in Fig. 1(A). This micro operating plate 151 is a strip-shaped member having one end as a rotation shaft end 151a and the other end as a movable end 151b, and the conduction state of the internal switch mechanism is switched by pressing and releasing the pressure 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 the pressure change of the pressure fluid introduced through the joint pipe 111 and applies this deformation as the external force F1 to the operating plate 107.

[0024] The main body frame 101 is a frame member formed by bending a rectangular metal plate into a C shape in a side view. Inside it, two switch components 150 are arranged side by side in the width direction Y. Also, on the side wall 101a of the lower side Z2, at positions corresponding to each switch component 150, elements 110 are attached in a state where the joint pipes 111 project outward one by one.

[0025] Hereinafter, the switching structure of the conduction state with respect to one switch component 150 on the left side of FIG. 1(B) in the width direction Y inside the main body frame 101 will be described.

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

[0027] The range spring receiving plate 103 is a metal plate that is arranged next to the switch component 150 in the width direction Y inside the main body frame 101 and abuts against and holds the upper end Z1 of the range spring 105. The range spring receiving plate 103 is screwed to the range adjustment bolt 103a that hangs vertically in the vertical direction Z from the side wall 101b on the upper side Z1 of the main body frame 101 inside the range spring 105 so that the position in the vertical direction Z can be adjusted. By adjusting the position of this range spring receiving plate 103, the compression amount of the range spring 105, which is a compression spring, is adjusted. As a result, the biasing force F3 of the range spring 105 on the operating plate 107 is adjusted, and thus the operating force F2 of the switch component 150 by the operating plate 107 according to the external force F1 from the element 110 is adjusted.

[0028] The differential pressure spring receiving plate 104 is a metal plate disposed within the main body frame 101 adjacent to the switch component 150 in the width direction Y and on the front side X1 of the differential pressure spring receiving plate 104 in the front-rear direction X. The differential pressure spring receiving plate 104 is connected to the upper end Z1 of the differential pressure spring 106 and holds the end. The differential pressure spring receiving plate 104 is screwed to the differential pressure adjustment bolt 104a that hangs down in the vertical direction Z from the upper side wall 101b of the main body frame 101 inside the differential pressure spring 106 so that the position in the vertical direction Z can be adjusted. By adjusting the position of this differential pressure spring receiving plate 104, the extension amount of the differential pressure spring 106, which is a tension spring, is adjusted. Thereby, the adjustment force F4 of the differential pressure plate 108 biased in the vertical direction Z by this differential pressure spring 106 with respect to the operating force F2 of the operating plate 107 is increased or decreased.

[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 inside. The range spring 105 biases the operating plate 107 in the direction opposite to the external force F1 from the element 110 with the biasing force F3 adjusted by the range spring receiving plate 103.

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

[0031] The actuating plate 107 is a plate member that receives an external force F1 from the element 110. The actuating plate 107 is a member that switches the conduction state of the switch mechanism of the switch component 150 by pressing or releasing the pressing of the movable end 151b of the micro-actuating plate 151 in the switch component 150 according to this external force F1. As shown in FIG. 2, the actuating plate 107 is formed by connecting an actuating receiving plate 107a that receives an external force F1 from the element 110 and a pressing arm 107b that presses the micro-actuating plate 151 so as to form an L shape in a side view from the width direction Y. Further, a pair of bearing portions 107c through which a rotation shaft 109 penetrates in the width direction Y are provided in the vicinity of the connecting end of the actuating receiving plate 107a with the pressing arm 107b. The actuating plate 107 is pivotally supported on the reinforcing plate 102 at these pair of bearing portions 107c so as to be rotatable about the rotation shaft 109. Then, the actuating receiving plate 107a is biased by a biasing force F3 in the direction opposite to the external force F1 by the range spring 105. When the sum of the external force F1 from the element 110 and the adjusting force F4 from the differential pressure plate 108 on the actuating receiving plate 107a is greater than the biasing force F3 from the range spring 105, the actuating plate 107 rotates about the rotation shaft 109 against this biasing force F3. And by this rotation, the pressing arm 107b presses 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 actuating plate 107 rotates in the reverse direction by the biasing force F3, and the pressing of the micro-actuating plate 151 by the pressing arm 107b is released. By such rotation according to the external force F1 from the element 110, the actuating plate 107 switches the conduction state of the switch component 150.

[0032] The differential pressure plate 108 biases the energized portion 107d, which is away from the rotation shaft 109 on the operation receiving plate 107a of the operation plate 107, with an adjusting force F4 in the direction opposite to the biasing force F3 from the range spring 105. As described above, this adjusting force F4 is applied by pulling up the differential pressure spring 106. Further, the energized portion 107d on the operation plate 107 is the tip portion on the side opposite to the rotation shaft 109 side on the operation receiving plate 107a. The differential pressure plate 108 adjusts the operating force F2 of the operation plate 107 with respect to the external force F1 from the element 110 by pulling up the energized portion 107d with the adjusting force F4 applied from the differential pressure spring 106. That is, the operating force F2 of the operation plate 107 with respect to the micro operation 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] As shown in the perspective view in FIG. 2, this differential pressure plate 108 includes a biasing portion 108a that contacts the energized portion 107d of the operation plate 107 and biases the energized portion 107d, and a pair of rotating arms 108b. The pair of rotating arms 108b are arm portions extending from both end portions in the width direction Y of the biasing portion 108a. Each extending end portion 108c is penetrated by the rotation shaft 109, so that the differential pressure plate 108 is pivotally supported on the reinforcing plate 102 in a double-supported state so as to be rotatable about the rotation shaft 109.

[0034] The rotation shaft 109 is a shaft member that penetrates, in this order of description, a pair of bearing flanges 102a provided on the reinforcing plate 102, a pair of rotating arms 108b of the differential pressure plate 108, and a pair of bearing portions 107c of the operation plate 107 in the width direction Y. By this rotation shaft 109, the operation plate 107 and the differential pressure plate 108 are pivotally supported on the reinforcing plate 102 in a coaxial state.

[0035] Here, in this embodiment, the energized portion 107d on the actuator plate 107 is a tongue-shaped protruding end portion with the central portion in the width direction Y protruding forward to the front side X1 at the tip side of the actuator receiving plate 107a. The differential pressure plate 108 makes point contact with this energized portion 107d as shown in FIG. 3. The biasing portion 108a on the differential pressure plate 108 is such that a rectangular plate-shaped biasing wall portion 108e hangs downward to the lower side Z2 from a bridge portion 108d connecting the opposite side of the extending end portion 108c of the pair of rotating arms 108b in the width direction Y. Further, in the biasing portion 108a, a triangular plate-shaped pulled portion 108f extends upward to the upper side Z1 from the central portion in the width direction Y of the bridge portion 108d. The differential pressure plate 108 is formed by bending a metal plate in a developed shape for such a biasing portion 108a and the pair of rotating arms 108b.

[0036] Also, a slit 108e-1 wider than the plate thickness of the energized portion 107d of the actuator plate 107 is provided in the biasing wall portion 108e of the biasing portion 108a of the differential pressure plate 108. The energized portion 1 + 07d of the actuator plate 107 passes through this slit 108e-1. Then, a lower inner edge 108e-2, which is a part of the inner edge of this slit 10 + 8e-1, contacts the energized portion 107d as a contact inner edge. Here, the contact inner edge 108e-2 is an arcuate edge convex toward the inside of the slit 108e. The differential pressure plate 108 makes point contact with the energized portion 107d at a contact point P1 on this arcuate contact inner edge 108e-2.

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

[0038] According to the switch 1 of the embodiment described above, the differential pressure plate 108 is pivotally supported so as to be rotatable about the same rotation axis 109 as the actuator plate 107 in a both-end supported state in the width direction Y of the actuator plate 107. Then, the differential pressure plate 108 biases the energized portion 107d in the actuator plate 107 by the applied adjustment force F4. Since this differential pressure plate 108 is in a both-end supported state and the adjustment force F4 is applied, the inclination of the differential pressure plate 108 due to the adjustment force F4 is suppressed, and the inclination of the actuator plate 107 biased by this differential pressure plate 108 is also suppressed. That is, according to the above-described switch 1, the inclination of the actuator plate 107 can be suppressed and the actuator plate 107 can be biased by the differential pressure plate 108.

[0039] Here, in the present embodiment, the differential pressure plate 108 contacts the central portion in the width direction Y at the energized portion 107d of the actuator plate 107. According to this configuration, since the differential pressure plate 108 contacts the central portion in the width direction Y of the energized portion 107d, the inclination of the actuator plate 107 biased by the differential pressure plate 108 can be further suppressed.

[0040] Further, in the present embodiment, the differential pressure plate 108 makes point contact with the energized portion 107d of the actuator plate 107. According to this configuration, even if the differential pressure plate 108 happens to tilt due to the application of the adjustment force F4, since the contact with the energized portion 107d is a point contact, the influence on the actuator plate 107 due to the inclination of the differential pressure plate 108 can be suppressed.

[0041] Further, in the present embodiment, the differential pressure plate 108 is provided with a slit 108e-1 that penetrates the energized portion 107d of the actuator plate 107, and a part of the inner edge thereof is used as a contact inner edge 108e-2 to contact the energized portion 107d. This contact inner edge 108e-2 is an arcuate edge that protrudes toward the inside of the slit 108e-1, and the differential pressure plate 108 makes point contact with the energized portion 107d at this arcuate contact inner edge 108e-2. According to this configuration, by making the contact portion of the differential pressure plate 108 with respect to the energized portion 107d of the actuator plate 107 the arcuate contact inner edge 108e-2 in the slit 108e-1, the differential pressure plate 108 can be effectively brought into point contact with the actuator plate 107.

[0042] Further, in the present embodiment, an adjustment force F4 is applied to the central portion in the width direction Y of the differential pressure plate 108. According to this configuration, the inclination of the differential pressure plate 108 can be further suppressed by applying the adjustment force F4 to the central portion of the differential pressure plate 108. Therefore, the inclination of the operating plate 107 biased by the adjustment force F4 from the differential pressure plate 108 can be further suppressed.

[0043] Note that the embodiments described above merely show typical forms of the present invention, and the present invention is not limited thereto. That is, various modifications can be made and implemented without departing from the gist of the present invention. As long as the switch configuration of the present invention is provided even by such modifications, of course, it is included in the scope of the present invention.

[0044] For example, in the above-described embodiment, as an example of the switch, the switch 1 having the dual-type microswitch 160 used as a pressure switch is illustrated. Further, in this switch 1, a pressure change of the pressure fluid is transmitted to the operating plate 107 via the bellows in the element 110. However, the switch is not limited thereto, and as long as it receives some external force by the operating plate and switches the conduction state of the switch component with an operating force corresponding to the external force, it may be used as various switches other than the pressure switch. Further, even when used as a pressure switch, the transmission of the pressure change to the operating plate may be performed via a member such as a diaphragm other than the bellows. Further, the switch type is not limited to the dual type, and a single type having only one switch component may be used.

[0045] Further, in the above-described embodiment, as an example of the switch component, one switch component 150 whose conduction state is switched via the micro operating plate 151 is illustrated. However, the switch component is not limited thereto, and the specific switch mode is not questioned.

[0046] In the above-described embodiment, as an example of the differential pressure plate, the differential pressure plate 108 which is a bent workpiece having the biasing portion 108a and the pair of rotating arms 108b is illustrated. However, the differential pressure plate is not limited to this, and as long as it is pivotally supported in a supported state at both ends, its specific shape and the like are not questioned.

[0047] In the above-described embodiment, as an example of the differential pressure plate, the differential pressure plate 108 that contacts the central portion in the width direction Y at the biased portion 107d of the actuator plate 107 is illustrated. However, the differential pressure plate is not limited to this, and it may contact a position deviated from the central portion of the actuator plate in the width direction. However, as described above, the fact that the differential pressure plate 108 contacts the central portion in the width direction Y of the actuator plate 107 can further suppress the inclination of the actuator plate 107.

[0048] In the above-described embodiment, as an example of the differential pressure plate, the differential pressure plate 108 that makes point contact with the biased portion 107d of the actuator plate 107 is illustrated. However, the differential pressure plate is not limited to this, and it may make line contact or surface contact with the actuator plate. However, as described above, by making the differential pressure plate 108 make point contact with the actuator plate 107, even if the differential pressure plate 108 were to tilt, the influence on the actuator plate 107 can be suppressed.

[0049] In the above-described embodiment, as an example of the point contact of the differential pressure plate with the actuator plate, the form in which the differential pressure plate 108 makes point contact with the biased portion 107d of the actuator plate 107 at the arc-shaped contact inner edge 108e-2 of the slit 108e-1 provided in the differential pressure plate 108 is illustrated. However, the form of point contact is not limited to this, and its specific contact form is not questioned. However, according to the form in which the differential pressure plate 108 makes point contact with the actuator plate 107 at the arc-shaped contact inner edge 108e-2 of the slit 108e-1, as described above, the differential pressure plate 108 can be effectively made to make point contact with the actuator plate 107.

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

Explanation of Signs

[0051] 1 Switch 101 Main body frame 101a, 101b Side walls 102 Reinforcing 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 Operating plate 107a Operating receiving plate 107b Pressing arm 107c Bearing portion 107d Biased portion 108 Differential pressure plate 108a Biasing portion 108b Rotating arm 108c Extended end portion 108d Bridge portion 108e Biasing wall portion 108e-1 Slit 108e-2 Contact inner edge 108f Traction portion 108f-1 Locking hole 109 Rotating shaft 110 Element 111 Joint pipe 150 Switch component 151 Micro operating plate 151a Rotating shaft end 151b Movable end 160 Microswitch F1 External force F2 Operating force F3 Biasing force F4 Adjusting 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 component, a plate member provided rotatably about a predetermined rotation axis and biased by a biasing force in a direction opposite to a predetermined external force, wherein when receiving the external force, the plate member rotates about the rotation axis against the biasing force to switch the conduction state of the switch component with an operating force corresponding to the external force; an operating plate, a differential pressure plate that adjusts the operating force of the operating plate with respect to the external force by biasing a biased portion away from the rotation axis in the operating plate with an adjustment force in a direction opposite to the biasing force, comprising: The differential pressure plate contacts the biased portion of the operating plate and is pivotally supported rotatably about the rotation axis in a both-end supported state in the width direction of the operating plate to be applied with the adjustment force, and biases the biased portion with the adjustment force. A switch characterized by this.

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

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

4. The differential pressure plate is provided with a slit wider than the plate thickness of the biased portion, which is penetrated through the biased portion of the operating plate, and a part of the inner edge of the slit is used as a contact inner edge to contact the biased portion. The switch according to claim 3, wherein the contact inner edge is an arcuate edge convex toward the inside of the slit, and makes point contact with the biased portion with the arcuate contact inner edge.

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

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