TWI814129B - Micro Switch - Google Patents

Abstract

The present invention provides a micro switch that can fully wipe the contact surface and peel off the insulating film on the contact surface when the contact is switched. The micro switch 1 is provided with: a movable component 6, which has a movable contact 6a at one end that can contact the first fixed contact 5b and the second fixed contact 4b that are separately arranged and fixed to the base 2, and the other end is supported by a support frame 30 Swingably supported; an actuator 7 for reversely operating the movable member 6 so that the movable contact 6a moves from the side of the first fixed contact 5b to the side of the second fixed contact 4b; and a tension spring 8. Apply tensile force to one end of the movable member 6. The support frame 30 includes the tension spring 8 and is arranged on both sides thereof. The first end 30A 1 of the support frame 30 on one side of the tension spring 8 is fixed on the base 2 , and the other end 30A ₁ of the tension spring 8 is fixed on the base 2 . The second end 30B ₁ of the side support frame 30 is not fixed on the base 2 .

Description

Micro switch

The present invention relates to a micro switch, which is used as a detection switch or an operation switch.

The micro switch relationship described in Japanese Utility Model Publication No. 63-129928 has: a common terminal (2), a normally open terminal (3) and a normally closed terminal (4) fixed to the switch base (1); Between the normally open contact (3b) of the normally open terminal (3) and the normally closed contact (4b) of the normally closed terminal (4), one end has a switching contact (5a, 5b) that can selectively contact these contacts. ); a freely rotatable actuator (6) for rotating the movable contact piece (5); and a movable contact piece (5) suspended between the movable contact piece (5) and the actuator (6) Reverse spring (7) (pages 2 to 4, Figure 4, Figure 5 of the publication).

In the above-mentioned micro switch, if the actuator (6) is pressed downward, the reversing spring (7) will reverse and the movable contact piece (5) will move downward, whereby the contact is switched, so that the switching contact Point (5b) is in contact with the normally open contact (3b) (refer to the two-point chain line in Figure 4 of the above-mentioned publication).

[Prior Technical Document] 〔Patent documents〕

[Patent Document 1] Japanese Utility Model Publication No. 63-129928 (see pages 2 to 4, Figure 4 and Figure 5)

However, in such a micro switch, an insulating film may be formed on the contact surface due to oxidation or vulcanization. In this case, the reliability of the switch may be reduced. In order to prevent oxidation or sulfation of the contact surface, gold plating on the contact surface can also be considered. However, gold plating is generally expensive and will increase the cost. Therefore, it is conceivable that when the contact is switched, the movable contact slides against the fixed contact to move the movable contact, thereby wiping the contact surface and peeling off the insulating film on the contact surface.

However, in the above-mentioned existing structure, when the contact is switched, the switching contact (5a) only moves downward away from the normally closed contact (4b), and wiping of the contact surface is not considered.

The present invention was made in view of such existing circumstances. The problem to be solved by the present invention is to provide a micro switch that can fully wipe the contact surface and peel off the insulating film on the contact surface when the contact is switched. . Furthermore, the present invention aims to allow the movable contact to slide sidewardly against the fixed contact when the contacts are switched, so as to improve the wiping performance.

The micro switch of the present invention has: a movable component, one end of which has a movable contact that can contact the first fixed contact and the second fixed contact that are separately arranged and fixed to the base, and the other end is swingably supported by a support frame; The actuator is used to reversely operate the movable part so that the movable contact moves from the first fixed The side of the fixed contact moves toward the side of the second fixed contact; and the tension spring exerts a tension force on one end of the movable component. The support frame encloses the tension spring and is arranged on both sides thereof. The first end of the support frame on one side of the tension spring is fixed on the base, and the second end of the support frame on the other side of the tension spring is fixed on the base. The part is not fixed to the base.

In the present invention, when the actuator operates the movable component in reverse, the movable contact will move from the side of the first fixed contact to the side of the second fixed contact, thereby switching the contacts. According to the present invention, the first end of the support frame used to support the other end of the movable component is fixed on the base, and the second end is not fixed on the base. Therefore, when the contact point is switched, When a load acts on the support frame when the movable member is reversely operated under the tensile force brought by the tension spring, the second end deforms relatively more than the first end. As a result, among the other ends of the movable member, the side of the second end is deformed more than the side of the first end. With this, the movable contact arranged at one end of the movable member is maintained in contact with the third side of the base. When a fixed contact is in contact, it moves sideways, so that the movable contact slides against the fixed contact. In this way, the contact surface can be wiped sufficiently and the insulating film on the contact surface can be peeled off.

In the present invention, when the movable member is reversely operated, the second end of the support frame is displaced relative to the first end under the action of the tensile force of the tension spring.

In the present invention, when the movable component is reversely operated, the displacement amount of the second end of the support frame is greater than the displacement amount of the first end under the action of the tensile force of the tension spring.

In the present invention, when the movable member is reversely operated, under the action of the tensile force of the tension spring, the movable contact is displaced in a direction intersecting with the axis direction of the tension spring before the movable contact is operated. The movable contact slides against the fixed contact.

In the present invention, the support frame is provided on one side of the tension spring and has a first columnar member having a first end and extending in the height direction; a second columnar member disposed on the other side of the tension spring and having a second end and extending in the height direction; and connecting the first column The connecting component is connected between the second columnar component and the second columnar component.

In the present invention, the support frame is composed of a first cylindrical member, a second cylindrical member and a connecting member and is generally U-shaped or U-shaped.

In the present invention, the dimension of the connecting member in the height direction decreases from the side of the first columnar member to the side of the second columnar member.

In the present invention, the connecting member is a tapered member.

In the present invention, the other end of the movable component is formed into two strands, one of the other ends is supported by the first columnar component of the support frame, and the other end is supported by the second columnar component of the support frame.

In the present invention, one end of the tension spring is locked to one end of the movable component, and the other end of the tension spring is locked to the actuator.

In the present invention, when the movable member is reversely operated, the movable contact rotates around the other end of the tension spring, causing the movable contact to slide against the fixed contact.

In the present invention, a restricting member for restricting the lateral movement of the one end of the movable member is provided on the side of one end of the movable member.

As described above, according to the present invention, since the movable contact slides against the fixed contact when the contact is switched, the contact surface can be wiped sufficiently and the insulating film on the contact surface can be peeled off.

1: Micro switch

2: base

3: Common terminal

4:Normally open fixed terminal

5:Normally closed fixed terminal

3A, 4A, 5A: external connection terminals

4a, 5a: Contact installation part

4b: Normally open fixed contact (second fixed contact)

5b: Normally closed fixed contact (first fixed contact)

6: Movable parts

6a ₁ , 6a ₂ , 6a: Movable contact

6A, 6B: Side wall part

7: Actuator

70a:Latching protrusion

8: Tension coil spring (tension spring)

9:Protrusion (restriction component)

20A:Bracket

20B:Bearing

30: Support frame

30A: First columnar component

30A ₁ : First end

30B: Second columnar component

30B ₁ : Second end

30C: Connecting parts

60a:Latching protrusion

71:Operation Department

CL ₀ , CL ₁ : Axis

[Fig. 1] is a perspective view from above showing the main components of a micro switch according to one embodiment of the present invention.

[Figure 2] is a perspective view from below of the aforementioned micro switch (Figure 1).

[Fig. 3] is a front perspective view showing the main components of the micro switch according to one embodiment of the present invention, corresponding to Fig. 1.

[Figure 4] is a rear oblique view of the aforementioned micro switch (Figure 3).

[Figure 5] is the front view of the aforementioned micro switch (Figure 3).

[Figure 6] is a rear view of the aforementioned micro switch (Figure 3).

[Figure 7] is a left side view of the aforementioned micro switch (Figure 3).

[Figure 8] is a right side view of the aforementioned micro switch (Figure 3).

[Figure 9] is a cross-sectional view along line IX-IX in Figure 5.

[Figure 10] is the X-X line cross-sectional view of Figure 5.

[Figure 11] is a plan view of the aforementioned micro switch (Figure 3).

[Figure 12] is an exploded assembly view of the aforementioned micro switch (Figure 3).

[Figure 13] is an overall perspective view of the common terminal in the aforementioned micro switch (Figure 3).

[Fig. 14] shows the state of the micro switch (Fig. 3) before the actuator is operated.

[Fig. 15] shows the state of the micro switch (Fig. 3) after the actuator is operated and before the movable member is reversed.

[Figure 16] is a cross-sectional view along line XVI-XVI in Figure 14.

[Figure 17] is a cross-sectional view along line XVII-XVII of Figure 15.

[Fig. 18] is a front view of the micro switch according to the fourth modification of the present invention.

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 to 17 are diagrams for illustrating a micro switch according to an embodiment of the present invention. Figs. 1 to 8 and 11 are diagrams showing the main components of the micro switch of this embodiment. Figs. 9 and 10 It is a side cross-sectional view of the micro switch. Figure 12 is an exploded assembly view of the micro switch. Figure 13 is a perspective view of the common terminal unit of the micro switch. Figures 14 to 17 are diagrams for explaining the effects of this embodiment. . In addition, in the following description, the long side direction of the micro switch is called the front and rear direction, the short side direction of the micro switch is called the side or left and right direction, and the direction orthogonal to these directions is called the up and down direction or the height direction. That is, taking Figure 5 as an example, the left-right direction in the figure is the front-back direction, the vertical direction on the paper surface of the figure is the side or left-right direction, and the up-down direction in the figure is the up-down direction.

As shown in Figures 1 to 8 and 12, the micro switch 1 of this embodiment includes: a base 2, which is an insulating base made of synthetic resin; a common terminal 3, a normally open fixed terminal 4 and a normally closed fixed terminal 5 , are all integrally fixed to the base 2 through insert molding. Each of these terminals penetrates the base 2 and extends in the up-down direction. The base end of each terminal has an external connection terminal 3A, 4A, 5A extending downwardly of the base 2 .

The front end (switching side end) of the normally open fixed terminal 4 has a normally open fixed contact (second fixed contact) 4b arranged above the base 2; the front end (switching side end) of the normally closed fixed terminal 5 There is a normally closed fixed contact (first fixed contact) 5b arranged opposite to the normally open fixed contact 4b above the base 2. The normally open fixed contact 4b is fixed to the contact mounting portion 4a by caulking or the like, and the contact mounting portion 4a is disposed above the base 2 at a position close to the base 2. The normally closed fixed contact 5b is also fixed to the contact mounting portion 5a by caulking or the like, and the contact mounting portion 5a is disposed above the base 2 and away from the base 2.

The front end portion of the common terminal 3 has a roughly U-shaped (or roughly U-shaped) support frame 30 . The support frame 30 has a first columnar member 30A extending in the up-and-down direction. The support frame 30 is arranged opposite to the first columnar member 30A at a distance from the side of the first columnar member 30A, and also extends in the up-down direction. The second columnar member 30B; and the connecting member 30C connecting the first columnar member 30A and the second columnar member 30B in the left-right direction.

As shown in Figure 9 , which is a cross-section along line IX-IX in Figure 5 , and Figure 10 , which is a cross-section along line XX in the same figure, in the support frame 30 , the first columnar member 30A connected to one end of the connecting member 30C A part of the first end 30A ₁ is embedded in the base 2 and fixed to the base 2 to become a fixed end. In contrast, the second end 30B ₁ of the second columnar member 30B connected to the other end of the connecting member 30C is not buried in the base 2 (therefore, it is not fixed to the base 2 and becomes a free end). , that is, free), and is arranged above the base 2. Therefore, the connecting member 30C that connects the end portions 30A ₁ and 30B ₁ in the left-right direction is spaced apart from the upper surface 2A of the base 2 and is arranged above the upper surface 2A.

Here, as shown in FIG. 13 , the common terminal 3 is formed by three-dimensionally bending the terminal plate; the support frame 30 is arranged in a direction substantially perpendicular to the direction of the external connection terminal 3A. As shown in the figure, the common terminal 3 has an extension portion 30A ₂ extending from the first end portion 30A ₁ of the first columnar member 30A to below the connecting member 30C. As shown in FIGS. 9 and 10 , the extended portion 30A ₂ is embedded in the base 2 and fixed to the base 2 . In addition, in the common terminal 3, there are three bends BP (see FIG. 13) between the extended portion _30A2 and the external connection terminal 3A. The reason is as follows. The reason is to eliminate the following problem: after the common terminal 3, the normally open fixed terminal 4 and the normally closed fixed terminal 5 are drilled in the unfolded state of being integrated and continuously arranged, the continuous arrangement state of each terminal 3, 4, and 5 is maintained. At the same time, after each contact 4b, 5b is fixed, each terminal 3, 4, 5 is bent, and each terminal 3, 4, 5 is cut after insert molding on the base 2. In this case, If the common terminal 3 has only one bend, the support frame 30 of the common terminal 3 will interfere with the adjacent normally open fixed terminal 4 in the unfolded state.

In addition, in the examples shown in FIGS. 9 and 10 , the dimension in the height direction (up and down direction) of the connecting member 30C, that is, the height, is assumed to be h 1 when the height of the first end 30A ₁ is h 1 and h ₁ is the height of the second end 30B. When the height of ₁ is set to h ₂ , it is set to h ₁ >h ₂ .

In the examples shown in FIGS. 9 and 10 , the height of the connecting member 30C further gradually decreases from the end 30A ₁ to the end 30B ₁ , so that the connecting member 30C is formed into a tapered shape when viewed from the front-to-back direction.

As shown in FIGS. 1 to 8 and 12 , the micro switch 1 includes a movable member 6 which has a movable contact 6 a at one end and can swing in the up and down direction with the other end serving as a fulcrum. The movable contact 6a is composed of a movable contact 6a ₁ arranged on the upper side and a movable contact 6a ₂ arranged on the lower side. The movable contact 6a ₁ on the upper side is configured to be in contact with the normally closed fixed contact 5b. The movable contacts 6a to ₂ on the side are configured to be in contact with the normally open fixed contact 4b.

The other end side of the movable member 6 is branched into two branches as shown in FIGS. 11 and 12 , each has a rear end surface 60 b at its front end, and has a pair of left and right side wall portions 6A, 6B. Cutouts 6A ₁ and 6B 1 are respectively formed at the front ends of the side wall portions 6A and _6B . On the other hand, engagement recessed portions 30A ₃ and 30B ₃ are respectively formed on the outer surfaces of the first columnar member 30A and the second columnar member 30B of the support frame 30 on the base 2 side. The front end portion of the side wall portion 6A of the movable member 6 is engaged with the engaging recess 30A ₃ of the first columnar member 30A of the support frame 30 , and the front end portion of the side wall portion 6B of the movable member 6 is engaged with the second column of the support frame 30 The movable member 6 is supported by the engaging recessed portions 30A ₃ and 30B ₃ of the support frame 30 so as to be swingable in the vertical _direction . In addition, at this time, each rear end surface 60 b of the front end of the other end side of the movable member 6 is in contact with the first columnar member 30A and the second columnar member 30B (see FIG. 11 ).

As shown in Figures 1 to 6 and 12, the micro switch 1 is provided with an actuator 7 for reversing the The movable member 6 is operated so that the movable contact 6a of the movable member 6 moves from an upper position on the side of the normally closed fixed contact 5b to a lower position on the side of the normally open fixed contact 4b. The actuator 7 is arranged in a direction intersecting the movable member 6 (see FIGS. 5 and 6 ).

As shown in FIG. 12 , one end of the actuator 7 has a pair of support plate portions 7 a and 7 b extending to both left and right sides. On the other hand, the base 2 is provided with a pair of left and right holders 20A and 20B protruding upward, and engaging recesses 20a and 20b are respectively formed in the respective holders 20A and 20B. The support plate portion 7a of the actuator 7 is engaged with the engagement recess 20a of the holder 20A, and the support plate portion 7b of the actuator 7 is engaged with the engagement recess 20b of the holder 20B (see Figures 5 and 6). Thereby, the actuator 7 is supported by each engagement recessed part 20a, 20b so that it can rock in the vertical direction. In addition, the other end of the actuator 7 has an operating portion 71 that is operated from the outside.

As shown in FIGS. 1 to 6 , 11 and 12 , the microswitch 1 has a tension coil spring (tension spring) 8 . The tension coil spring 8 has hook portions 8a and 8b for locking at each end portion. The hook portion 8a of the tension coil spring 8 is engaged with the engaging protrusion 60a provided on one end side of the movable member 6 (Fig. 12), and the hook portion 8b is engaged with the engaging protrusion 60a provided on the other end side of the actuator 7. Stop protrusion 70a (Fig. 12). Thereby, the tensile force exerted by the tension coil spring 8 acts between one end side of the movable member 6 and the other end side of the actuator 7 .

One end of the tension coil spring 8 is arranged between the first columnar member 30A and the second columnar member 30B of the support frame 30 as shown in FIG. 11 . That is, the first columnar member 30A and the second columnar member 30B of the support frame 30 are arranged on both left and right sides while sandwiching the tension coil spring 8 . In addition, as shown in FIG. 12 , the actuator 7 has a pair of left and right extension portions 7 c and 7 d extending upward at the center portion in the longitudinal direction. On the other hand, as shown in FIG. 13 , engaging recessed portions 30A ₄ and 30B ₄ are respectively formed on the inner surfaces of the first columnar member 30A and the second columnar member 30B of the support frame 30 . The extension portion 7c of the actuator 7 is engaged with the engagement recess 30A ₄ of the first columnar member 30A of the support frame 30 , and the extension portion 7d of the actuator 7 is engaged with the second columnar member of the support frame 30 30B ₄ of 30B (see FIG. 10 ), whereby the upward movement of the actuator 7 is restricted.

Next, the operation and effect of this embodiment will be described using FIGS. 14 to 17 .

FIG. 14 shows the state of the micro switch 1 before the actuator 7 is operated, and FIG. 15 shows the state after the operation. In addition, Figure 16 is a cross-sectional view taken along the line XVI-XVI in Figure 14, and Figure 17 is a cross-sectional view taken along the line XVII-XVII in Figure 15.

In the pre-operation state shown in Figure 14, the movable contact _6a1 of the movable member 6 is in contact with the normally closed fixed contact 5b, and the circuit between the common terminal 3 and the normally closed fixed terminal 5 is closed. The force brought by 8 causes the specified contact pressure to act between the contacts. In addition, at this time, as shown in FIG. 16 , the axis CL ₀ of the tension coil spring 8 substantially coincides with the center lines of the movable contact 6 a ₁ and the normally closed fixed contact 5 b of the movable member 6 . That is, when viewed from above, the center lines of the movable contacts 6a ₁ and the normally closed fixed contact 5b are substantially aligned.

When the actuator 7 is operated from this state, as shown in Fig. 15, the actuator 7 moves along the side of the base 2 to which the support plate portions 7a, 7b (Fig. 12) on one end side of the actuator 7 are engaged. Each of the holders 20A and 20B is engaged around the recessed portions 20a and 20b (same figure) and rocked downward, and the operating portion 71 moves downward. As a result, the movable member 6 is reversely operated, so that the movable member 6 is switched from the normally closed position to the fixed position. The upper position on the contact 5b side moves to the lower position on the normally open fixed contact 4b side.

In this case, just before the movable member 6 is reversely operated by the actuator 7, as shown in FIG. 15, the movable contact _6a1 of the movable member 6 is still in contact with the normally closed fixed contact 5b. Then, the actuator 7 is rocked downward so that the hook 8a of the tension coil spring 8 is locked with the locking protrusion 60a on one end side of the movable member 6 and the hook 8b is locked with the actuator. The distance between the locking protrusions 70 a on the other end side of the movable member 7 becomes larger. Therefore, the tensile coil spring 8 is stretched, thereby increasing the tensile force on the one end side of the movable member 6 .

At this time, the first columnar member 30A and the second columnar member 30B of the support frame 30 are in contact with each rear end surface 60b of the two strand-shaped other ends of the movable member 6, respectively. The pressing force on the other end will increase. As described above, the first end 30A ₁ of the first columnar member 30A is fixed to the base 2 , and the second end 30B ₁ of the second columnar member 30B is not fixed to the base 2 . Therefore, when moving from the movable member 6 When the pressing force acting on the other end increases, compared with the first end 30A ₁ of the first columnar member 30A, the second end 30B ₁ of the second columnar member 30B deforms relatively more, and the deformation amount becomes larger. . In other words, at this time, the second end portion 30B ₁ of the second columnar member 30B is displaced relative to the first end portion 30A ₁ of the first columnar member 30A, and the displacement amount is greater than the first end portion 30A 1 , so that the second end portion 30A ₁ of the second columnar member 30B is displaced. The columnar member 30B rotates along the periphery of the first columnar member 30A.

Moreover, in this case, as shown in FIG. 10 , the height _{h 1} of the first end 30A ₁ is greater than the height h ₂ of the second end 30B ₁ . Ideally, the height of the connecting member 30C extends from the first end 30A ₁ to the second end 30A 1 . The two ends 30B ₁ gradually decrease, so that the connecting member 30C is formed into a tapered shape, so the displacement of the second end 30B ₁ is greater than the displacement of the first end 30A ₁ .

In addition, at this time, the first end 30A ₁ of the first columnar member 30A is a fixed end, and the second end 30B ₁ of the second columnar member 30B is a free end. Therefore, when the other end of the movable member 6 acts on each When the pressing force of the columnar members 30A and 30B increases, the displacement of the second end 30B ₁ of the second columnar member 30B is greater than the displacement of the first end 30A ₁ of the first columnar member 30A. The quantity is larger.

Thereby, as shown in FIG. 17 , under the action of the tensile force brought by the tension coil spring 8 , one end side of the movable member 6 will be displaced laterally along the periphery of the other end side (that is, turn sideways). At this time, the hook portion 8 a on one end side of the tension coil spring 8 is locked with the locking protrusion 60 a on one end side of the movable member 6 . Therefore, it is displaced to the side of the movable member 6 , thereby stretching the coil spring 8 One end will also move sideways. As a result, as shown by the single-point chain line and the double-point chain line in the figure, the axis CL ₁ of the tension coil spring 8 moves sideways from the position of the axis CL ₀ with the other end side of the tension coil spring 8 as the center. axial displacement, and displacement in the direction intersecting the axis CL ₀ . Along with this, the movable contact 6a ₁ (the same applies to the movable contact 6a ₂ ) on the one end side of the movable member 6 maintains the contact state with the fixed contact 5b and moves along the axis CL ₀ of the tension coil spring 8 Displacement in the direction of intersection. At this time, as shown in the figure, the movable contact 6a ₁ (the same applies to the movable contact 6a ₂ ) is displaced laterally (that is, rotated sideways) relative to the normally closed fixed contact 5b, thereby causing the normal The closed fixed contact 5b slides.

In this way, the contact surface can be wiped sufficiently and the insulating film on the contact surface can be peeled off.

Moreover, if the actuator 7 is further operated outside the state of FIG. 15 , the movable member 6 will be reversed, and the movable member 6 will move from the upper position on the side of the normally closed fixed contact 5b to the lower position on the side of the normally open fixed contact 4b. Move to switch contacts.

[First modification]

In the previous embodiment, as shown in FIG. 10 , a part of the first end 30A ₁ of the first column member 30A of the support frame 30 has been shown to be embedded in the base 2 and fixed to the base 2 . , but the application of the present invention is not limited to this. The portion embedded in the base 2 and fixed to the base 2 may also be the entire first end 30A ₁ .

[Second modification]

In the foregoing embodiments, it has been shown that the extended portion 30A ₂ of the common terminal 3 is disposed from the first end portion 30A ₁ of the first columnar member 30A to below the connecting member 30C, that is, it is disposed on the first Although the example is shown on the extension line of the end portion 30A ₁ (see FIGS. 9 , 10 , and 13 ), the application of the present invention is not limited to this. The extended portion 30A ₂ may also be arranged at a position offset to the side relative to the first end portion 30A ₁ . In this case, the extended portion 30A ₂ is ideally arranged between the center line of the support frame 30 and the center line of the first column member 30A. At this time, the extended portion 30A ₂ is connected between the center line of the support frame 30 and the first column member 30A. The space between the center lines of the columnar member 30A extends downward from the connecting member 30C. In addition, at this time, the first end portion 30A ₁ of the first columnar member 30A is embedded in the base 2 . In contrast, the extension portion 30A ₂ may or may not be embedded in the base 2 .

[Third modification]

In the foregoing embodiment, an example has been shown in which the extension portion 30A 2 is provided below the support frame 30 and between the external connection terminal 3A and the extension portion 30A ₂ . However, the extension portion 30A ₂ may be omitted. In this case, the common terminal 3 is composed of two parts, the support frame 30 and the external connection terminal 3A. Although these parts are arranged separately, they can be electrically connected by, for example, a jumper wire.

[Fourth modification]

FIG. 18 shows a micro switch according to a fourth modification of the present invention. In the same figure, the same symbols as those in the previous embodiment represent the same or corresponding parts.

In the micro switch 1 shown in Fig. 18, the contact mounting portion 5a is to support the normally closed fixed contact 5b from below, and the upper portion of the extension portion 5c extending upward from the base 2 is provided with an inward (same as the same) The protruding portion 9 on the left side of the figure). The protruding portion 9 is disposed at a position to the side of one end of the movable member 6 (the rear side of the drawing) with a predetermined distance between it and one end of the movable member 6, and is connected to one end of the movable member 6 when viewed from the front direction. overlap. The protruding portion 9 functions as a restricting member for restricting lateral movement of one end of the movable member 6 . Although similar protrusions are shown in the previous embodiments, they are not arranged on the side of one end of the movable member 6 and do not overlap with one end of the movable member 6 when viewed from the front direction.

The reason why the protrusion 9 as such a restricting member is provided is as follows.

The reason is that due to vibration or impact during the transportation of the micro switch 1, or due to impact when the micro switch 1 is dropped during installation, one end of the free end side of the movable member 6 may sometimes move sideways. The situation of movement. In addition, it must also be considered that when the movable contact 6a on the one end side of the movable member 6 returns from the lower position on the side of the normally open fixed contact 4b to the upper position on the side of the normally closed fixed contact 5b, the movable contact 6a needs to be in contact with the normally closed fixed contact 5b side. The displacement direction during the above-mentioned reversal operation is the displacement in the opposite direction to the normally closed fixed contact 5b. Therefore, under the inertia at this time, the amount of movement to the side of one end of the movable member 6 may become larger. In this case, by bringing one end of the movable member 6 into contact with the protruding portion 9 , the amount of sideward movement of the one end of the movable member 6 is prevented from becoming excessive, and the other end of the movable member 6 is prevented from being moved from the support frame 30 The first columnar member 30A and the second columnar member 30B are separated from each other.

[Other modifications]

The above-described embodiments and modifications should be regarded as merely illustrative of the present invention in all respects and not limiting. Even if it is not explicitly stated in this specification, a person with ordinary skill in the technical field to which the present invention belongs, taking into account the above teachings, can construct various modifications using the principles of the present invention without departing from the spirit and essential characteristics of the present invention. and other embodiments.

[Industrial Applicability]

The microswitch of the present invention is useful as a detection switch or an operation switch.

1: Micro switch

2: base

3: Common terminal

4:Normally open fixed terminal

5:Normally closed fixed terminal

3A, 4A, 5A: external connection terminals

4a, 5a: Contact installation part

4b: Normally open fixed contact (second fixed contact)

6: Movable parts

6a ₁ : Movable contact

6A, 6B: Side wall part

7: Actuator

8: Tension coil spring (tension spring)

20B:Bearing

30: Support frame

30A: First columnar component

30B: Second columnar component

30B ₁ : Second end

30C: Connecting parts

60a:Latching protrusion

71:Operation Department

Claims (8)

A micro switch, which is characterized by having: a movable component, one end of which has a movable contact that can contact the first fixed contact and the second fixed contact that are separately arranged and fixed to the base, and the other end is swingably supported by a support frame Support; the actuator is used to reversely operate the movable component so that the movable contact moves from the side of the first fixed contact to the side of the second fixed contact; and the tension spring is equipped with is provided in the front and rear direction to apply a tensile force to the one end of the movable component; and the support frame is arranged on either side of the tension spring and has a first end and extends along the first end from the first end. A first columnar part extending upward, a second columnar part disposed on the other left and right sides of the tension spring and having a second end and extending upward from the second end, and the first end The connecting portion connecting the first end and the second end is formed into a roughly U-shape or a U-shape; only the first end is fixed on the base as the fixed end, and the second end is not fixed on the base. The top is a free end, and the structural component composed of the first end, the connecting portion and the second end is fixedly supported on the base on one side by the first end; when the movable component is reversely operated When, under the action of the tensile force of the tension spring, the second end portion rotates in the horizontal plane around the first end portion through the connecting portion, causing the second columnar portion to pass through the connecting portion. The portion rotates around the first end portion, thereby displacing the movable contact in the left and right direction relative to the first fixed contact. The micro switch according to claim 1, wherein the support frame further has an extension portion extending downward from the first end portion, and the extension portion is arranged in an up-and-down direction relative to the first columnar portion. , the first end part and the extension part are fixed on the base. The micro switch according to claim 1, wherein the size of the connecting portion in the height direction decreases from the side of the first columnar portion to the side of the second columnar portion. The micro switch according to claim 3, wherein the connecting part is a tapered component. The micro switch of claim 1, wherein the other end of the movable component forms two branches, one of the other ends is supported by the first columnar part of the support frame, and the other end of the other end It is supported by the second columnar part of the support frame. The micro switch of claim 1, wherein one end of the tension spring is locked to the one end of the movable component, and the other end of the tension spring is locked to the actuator. The micro switch of claim 1, wherein when the movable component is reversely operated, the movable contact rotates around the other end of the tension spring, causing the movable contact to move left and right relative to the fixed contact. direction slide. The micro switch according to claim 1, wherein a restricting member is provided on the side of the one end of the movable component to restrict the lateral movement to the one end of the movable component.