JP2022078484A - Microswitch - Google Patents

Abstract

To provide a microswitch capable of sufficiently wiping the surface of a contact at the time of switching the contact and peeling off an insulating coating on the surface of the contact.SOLUTION: A microswitch 1 is provided with a movable contact 6a having, at one end thereof, a movable contact 6a capable of contacting first and second fixed contacts 5b and 4b that are arranged to be spaced from each other and fixed to a base 2, the other end thereof being swingably supported by a support frame 30, an actuator 7 for reversing the movable member 6 so as to move the movable contact 6a from the first fixed contact 5b side to the second fixed contact 4b side, and a tension spring 8 for applying a tensile force to one end of the movable member 6. The support frame 30 is arranged on both sides of the tension spring 8, a first end portion 30A1 of the support frame 30 on one side of the tension spring 8 is fixed to the base 2, and a second end portion 30B1 of the support frame 30 on the other side of the tension spring 8 is not fixed to the base 2.SELECTED DRAWING: Figure 3

Description

The present invention relates to a micro switch used as a detection switch, an operation switch, and the like.

The microswitches described in Japanese Patent Publication No. 63-129928 include a common terminal (2) fixed to a switch base (1), a normally open terminal (3), a normally closed terminal (4), and a normally open terminal (4). A movable contact that is arranged between the normally open contact (3b) of 3) and the normally closed contact (4b) of the normally closed terminal (4) and has a switching contact (5a, 5b) at one end that selectively contacts them. It is provided with a piece (5), a rotatable actuator (6) for rotating the movable contact piece (5), and a reversing spring (7) suspended between the movable contact piece (5) and the actuator (6). (Pages 2 to 4, 4 and 5 of the relevant gazette).

In the above-mentioned micro switch, when the actuator (6) is pushed down, the reversing spring (7) reverses and the movable contact piece (5) moves downward, whereby the contact is switched and the switching contact is switched. (5b) comes into contact with the normally open contact (3b) (see the two-dot chain line in FIG. 4 of the above-mentioned publication).

By the way, in such a microswitch, an insulating film may be formed on the contact surface due to oxidation or sulfurization, and in that case, the reliability of the switch is lowered. It is conceivable to apply gold plating to the contact surface in order to prevent oxidation and sulfurization of the contact surface, but gold plating is generally expensive and increases the cost. Therefore, it is conceivable to wipe the contact surface and peel off the insulating coating on the contact surface by moving the movable contact so that the movable contact slides with respect to the fixed contact when the contact is switched.

However, in the above-mentioned conventional configuration, when the contact is switched, the switching contact (5a) simply separates downward from the normally closed contact (4b), and the wiping of the contact surface is not considered.

The present invention has been made in view of such conventional circumstances, and the problem to be solved by the present invention is that the contact surface can be sufficiently wiped when switching contacts, and an insulating film on the contact surface can be provided. The purpose is to provide a microswitch that can be peeled off. Further, the present invention aims to improve the wiping performance by allowing the movable contact to slide so as to be laterally displaced with respect to the fixed contact when the contact is switched.

The microswitch according to the present invention has a movable contact at one end that can contact the first and second fixed contacts that are separately arranged and fixed to the base, and the other end is swingably supported by a support frame. A movable member, an actuator for reversing the movable member so as to move the movable contact from the first fixed contact side to the second fixed contact side, and a tension spring for applying a tensile force to one end of the movable member. I have. Support frames are placed on both sides of the tension spring, the first end of the support frame on one side of the tension spring is fixed to the base and the second end of the support frame on the other side of the tension spring. The part is not fixed to the base.

In the present invention, when the movable member is inverted by the actuator, the movable contact moves from the first fixed contact side to the second fixed contact side, whereby the contact is switched. According to the present invention, at this time, since the first end portion of the support frame supporting the other end of the movable member is fixed to the base and the second end portion is not fixed to the base, tension is applied when the contacts are switched. When a load is applied to the support frame when the movable member is inverted under the action of the tensile force of the spring, the second end portion is deformed relatively more than the first end portion. As a result, of the other ends of the movable member, the second end side is deformed more than the first end side, and accordingly, the movable contact arranged at one end of the movable member is the second on the base side. Since the movable contact moves laterally while being in contact with the fixed contact of 1, the movable contact slides with respect to the fixed contact. In this way, the contact surface can be sufficiently wiped and the insulating film on the contact surface can be peeled off.

In the present invention, during the reversing operation of the movable member, the second end portion of the support frame is displaced with respect to the first end portion under the action of the tensile force of the tension spring.

In the present invention, during the reversing operation of the movable member, the displacement amount of the second end portion of the support frame is larger than the displacement amount of the first end portion under the action of the tensile force of the tension spring.

In the present invention, during the reversing operation of the movable member, the movable contact is fixed by the displacement of the movable contact in the direction intersecting the axial direction of the tension spring before the operation of the movable contact under the action of the tensile force of the tension spring. It is sliding with respect to the contacts.

In the present invention, the support frame is disposed on one side of the tension spring, the first columnar member having the first end and extending in the height direction, and the other side of the tension spring. It is provided with a second columnar member having a second end and extending in the height direction, and a connecting member connecting the first and second columnar members.

In the present invention, the support frame is configured in a substantially U-shape or a substantially U-shape by the first and second columnar members and connecting members.

In the present invention, the height dimension of the connecting member becomes smaller from the side of the first columnar member toward 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 member is bifurcated, one of the other ends is supported by the first columnar member of the support frame, and the other end is supported by the second columnar member of the support frame. Has been done.

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

In the present invention, when the movable member is inverted, the movable member rotates around the other end of the tension spring, so that the movable contact slides with respect to the fixed contact.

In the present invention, a regulating member for restricting the lateral movement of 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 with respect to the fixed contact when the contact is switched, the contact surface can be sufficiently wiped and the insulating coating on the contact surface can be peeled off.

It is an upper perspective view which shows the main component of the microswitch by one Embodiment of this invention. It is a lower perspective view of the said microswitch (FIG. 1). It is a front perspective view which shows the main component of the microswitch according to one Embodiment of this invention, and corresponds to FIG. It is a rear perspective view of the micro switch (FIG. 3). It is a front view of the micro switch (FIG. 3). It is a rear view of the micro switch (FIG. 3). It is a left side view of the micro switch (FIG. 3). It is a right side view of the micro switch (FIG. 3). FIG. 5 is a sectional view taken along line IX-IX of FIG. FIG. 5 is a cross-sectional view taken along the line X-X of FIG. It is a top view of the micro switch (FIG. 3). It is an exploded assembly drawing of the said microswitch (FIG. 3). It is an overall perspective view of the common terminal in the micro switch (FIG. 3). In the micro switch (FIG. 3), the state before the operation of the actuator is shown. In the micro switch (FIG. 3), the state immediately after the operation of the actuator and before the reversal of the movable member is shown. FIG. 14 is a cross-sectional view taken along the line XVI-XVI of FIG. FIG. 15 is a sectional view taken along line XVII-XVII of FIG. It is a front view of the microswitch by the 4th modification of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 17 are diagrams for explaining a microswitch according to an embodiment of the present invention, and FIGS. 1 to 8 and 11 are diagrams and views showing the main components of the microswitch according to the present embodiment. 9 and 10 are side sectional views of the micro switch, FIG. 12 is an exploded assembly view of the micro switch, FIG. 13 is a perspective view of a single common terminal of the micro switch, and FIGS. 14 to 17 explain the operation and effect of this embodiment. It is a figure for. In the following description, the longitudinal direction of the microswitch is referred to as the front-back direction, the lateral direction is referred to as the lateral or horizontal direction, and the direction orthogonal to these is referred to as the vertical direction or the height direction. That is, when FIG. 5 is taken as an example, the left-right direction in the figure is the front-back direction, the vertical direction on the paper surface in 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 FIGS. 1 to 8 and 12, the microswitch 1 according to the present embodiment has a base 2 which is an insulating base made of synthetic resin and a common terminal 3 which is integrally fixed to the base 2 by insert molding. , A normally open fixed terminal 4 and a normally closed fixed terminal 5. Each of these terminals extends in the vertical direction through the base 2, and the base end portion of each terminal has external connection terminals 3A, 4A, and 5A extending below the base 2, respectively.

The tip portion (switching side end portion) of the normally open fixed terminal 4 has a normally open fixed contact (second fixed contact) 4b arranged above the base 2, and is a tip portion of the normally closed fixed terminal 5. (Switching side end portion) has a normally closed fixed contact (first fixed contact) 5b which is arranged above the normally open fixed contact 4b above the base 2. The normally open fixed contact 4b is fixed to a contact mounting portion 4a arranged at a position closer to the base 2 above the base 2 by caulking or the like. The normally closed fixed contact 5b is similarly fixed to the contact mounting portion 5a located above the base 2 at a position away from the base 2 by caulking or the like.

The tip of the common terminal 3 has a substantially U-shaped (or roughly U-shaped) support frame 30. The support frame 30 is arranged so as to face each other with a space between the first columnar member 30A extending in the vertical direction and the first columnar member 30A on the side of the first columnar member 30A, and similarly in the vertical direction. It has a second columnar member 30B that extends, and a connecting member 30C that connects the first and second columnar members 30A and 30B in the left-right direction.

As shown in FIG. 9 which is the IX-IX line cross section of FIG. 5 and FIG. 10 which is the XX line cross section of the same figure, the first columnar member 30A to which one end of the connecting member 30C is connected in the support frame 30. A part of the first end portion 30A ₁ is embedded in the base 2 and fixed to the base 2, and is a fixed end. On the other hand, the second end portion 30B ₁ of the second columnar member 30B to which the other end of the connecting member 30C is connected is not embedded in the base 2 (hence, fixed to the base 2). It is free end, that is, free), and is located above the base 2. Therefore, the connecting member 30C for connecting the end portions 30A ₁ and 30B ₁ in the left-right direction is arranged above the upper surface 2A with a space between the connecting member 30C and the upper surface 2A of the base 2.

Here, as shown in FIG. 13, the common terminal 3 is configured by three-dimensionally bending the terminal plate, and the support frame 30 is arranged in a direction substantially orthogonal to the direction of the external connection terminal 3A. There is. As shown in the figure, the common terminal 3 has an extension portion 30A ₂ extending below the connecting portion 30C from the first end portion 30A ₁ of the first columnar member 30A. As shown in FIGS. 9 and 10, the extension portion 30A ₂ is embedded in the base 2 and fixed to the base 2. In the common terminal 3, there are three bending points BP between the extending portion 30A ₂ and the external connection terminal 3A (see FIG. 13), and the reason is as follows. After the common terminal 3 is punched out in an expanded state integrally connected to the normally open fixed terminal 4 and the normally closed fixed terminal 5, each contact 4b, while maintaining the connected state of the terminals 3, 4 and 5. Each terminal 3, 4, 5 is bent through the fixing process of 5b, and after being insert-molded into the base 2, each terminal 3, 4, 5 is separated. If there is, the support frame 30 of the common terminal 3 interferes with the adjacent normally open fixed terminal 4 in the expanded state, and this is to eliminate it.

Further, in the examples shown in FIGS. 9 and 10, the dimension, that is, the height in the height direction (vertical direction) of the connecting member 30C is such that the height at the first end portion 30A ₁ is h ₁ and the second end portion. When the height at 30B ₁ is h ₂ ,
h ₁ > h ₂
Is set to.

In the examples shown in FIGS. 9 and 10, the height of the connecting member 30C gradually decreases from the end portion 30A ₁ toward the end portion 30B ₁ , and the connecting member 30C is from the front-rear direction. It is formed in a tapered shape as seen.

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

As shown in FIGS. 11 and 12, the other end side of the movable member 6 is bifurcated, has a rear end surface 60b at its tip, and has a pair of left and right side wall portions 6A and 6B, respectively. .. Notches 6A ₁ and 6B ₁ are formed at the tips of the side wall portions 6A and 6B, respectively. On the other hand, engaging recesses 30A ₃ and 30B ₃ are formed on the outer surfaces of the first and second columnar members 30A and 30B of the support frame 30 on the base 2 side, respectively. The tip portions of the side wall portions 6A and 6B of the movable member 6 are engaged with the engaging recesses 30A ₃ and 30B ₃ of the first and second columnar members 30A and 30B of the support frame 30, respectively. The movable member 6 is supported by the engaging recesses 30A ₃ and 30B ₃ of the support frame 30 so as to be swingable in the vertical direction. At this time, each rear end surface 60b at the other end of the movable member 6 is in contact with the first and second columnar members 30A and 30B (see FIG. 11).

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

As shown in FIG. 12, the actuator 7 has a pair of support plate portions 7a and 7b projecting to both the left and right sides at one end. On the other hand, the base 2 is provided with a pair of left and right pedestals 20A and 20B protruding upward, and each of the pedestals 20A and 20B is formed with engaging recesses 20a and 20b, respectively. The support plate portions 7a and 7b of the actuator 7 are engaged with the engaging recesses 20a and 20b of the pedestals 20A and 20B, respectively (see FIGS. 5 and 6), whereby the actuator 7 is engaged with each other. It is supported by the joint recesses 20a and 20b so as to be swingable in the vertical direction. Further, the actuator 7 has an operation unit 71 operated from the outside at the other end.

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. The hook portion 8a of the tension coil spring 8 is locked to the locking protrusion 60a (FIG. 12) provided on one end side of the movable member 6, and the hook portion 8b is provided on the other end side of the actuator 7. It is locked to the locking protrusion 70a (FIG. 12). As a result, the tensile force of the tension coil spring 8 acts between one end side of the movable member 6 and the other end side of the actuator 7.

As shown in FIG. 11, one end of the tension coil spring 8 is arranged between the first and second columnar members 30A and 30B of the support frame 30. That is, the first and second columnar members 30A and 30B of the support frame 30 are arranged on both the left and right sides with the tension coil spring 8 interposed therebetween. Further, as shown in FIG. 12, the actuator 7 has a pair of left and right overhanging portions 7c and 7d that overhang upward in the central portion in the longitudinal direction. On the other hand, as shown in FIG. 13, engaging recesses 30A ₄ and 30B ₄ are formed on the inner side surfaces of the first and second columnar members 30A and 30B of the support frame 30, respectively. The overhanging portions 7c and 7d of the actuator 7 are engaged with the engaging recesses 30A ₄ and 30B ₄ of the first and second columnar members 30A and 30B of the support frame 30, respectively (see FIG. 10). As a result, the upward movement of the actuator 7 is restricted.

Next, the action and effect of this example will be described with reference to FIGS. 14 to 17.
FIG. 14 shows the state of the micro switch 1 before the operation of the actuator 7, and FIG. 15 shows the state immediately after the operation. 16 is a sectional view taken along line XVI-XVI of FIG. 14, and FIG. 17 is a sectional view taken along line XVII-XVII of FIG.

In the pre-operation state shown in FIG. 14, the movable contact 6a ₁ 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. A predetermined contact pressure is applied by the urging force of the tension coil spring 8. 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 6a ₁ and the normally closed fixed contact 5b of the movable member 6. That is, the movable contacts 6a ₁ and the normally closed fixed contacts 5b are placed in a state in which their center lines are substantially aligned when viewed from above.

When the actuator 7 is operated from this state, as shown in FIG. 15, the pedestals 20A and 20B on the base 2 side are engaged with the support plate portions 7a and 7b (FIG. 12) on one end side of the actuator 7. The actuator 7 swings downward around each of the engaging recesses 20a and 20b (in the same figure), the operating portion 71 moves downward, and as a result, the movable member 6 is inverted and the movable member 6 is moved. It tries to move from the upper position on the normally closed fixed contact 5b side to the lower position on the normally open fixed contact 4b side.

In this case, immediately before the movable member 6 is inverted by the actuator 7, as shown in FIG. 15, the movable contact 6a ₁ of the movable member 6 is still in contact with the normally closed fixed contact 5b. Then, as the actuator 7 swings downward, the hook portion 8a of the tension coil spring 8 is locked, and the locking protrusion 60a on one end side of the movable member 6 and the hook portion 8b are locked. The distance between the actuator 7 and the locking protrusion 70a on the other end side is large. Therefore, the tension coil spring 8 is stretched, so that the tensile force with respect to one end side of the movable member 6 increases. There is.

At this time, pressing acts on the first and second columnar members 30A and 30B of the support frame 30 from the other end of the movable member 6 with which the rear end surfaces 60b of the bifurcated other ends of the movable member 6 abut. The force increases. As described above, since the first end portion 30A ₁ of the first columnar member 30A is fixed to the base 2 and the second end portion 30B ₁ of the second columnar member 30B is not fixed to the base 2. When the pressing force acting from the other end of the movable member 6 increases, the second end portion 30B ₁ of the second columnar member 30B is relatively closer to the first end portion 30A ₁ of the first columnar member 30A. It is greatly deformed and the amount of deformation becomes large. In other words, at this time, the second end portion 30B ₁ of the second columnar member 30B is displaced with respect to the first end portion 30A ₁ of the first columnar member 30A, and the first end portion is used. The amount of displacement is larger than that of 30A ₁ , and the second columnar member 30B rotates around the first columnar member 30A.

Moreover, in this case, as shown in FIG. 10, the height h ₁ of the first end portion 30A ₁ is larger than the height h ₂ of the second end portion 30B ₁ , and the connecting member is preferable. Since the height of 30C gradually decreases from the first end portion 30A ₁ toward the second end portion 30B ₁ and the connecting member 30C is formed in a tapered shape, the height of the second end portion 30B ₁ The displacement amount is further larger than the displacement amount of the first end portion 30A ₁ .

Further, at this time, since the first end portion 30A ₁ of the first columnar member 30A is a fixed end and the second end portion 30B ₁ of the second columnar member 30B is a free end, the movable member 6 When the pressing force acting on the columnar members 30A and 30B increases from the other end of the columnar member 30A, the displacement amount of the first columnar member 30A with respect to the first end portion 30A ₁ is larger than that of the second columnar member 30B. The amount of displacement with respect to the end portion 30B ₁ is larger.

As a result, as shown in FIG. 17, under the action of the tensile force of the tension coil spring 8, one end side of the movable member 6 is displaced laterally around the other end side (that is, it rotates toward the side). Move). At this time, since the hook 8a on one end side of the tension coil spring 8 is locked to the locking protrusion 60a on the one end side of the movable member 6, the tension coil spring 8 is displaced due to the lateral displacement of the movable member 6. One end side of is also displaced toward the side. As a result, as shown in the one-dot chain line and the two-dot chain line in the figure, the axis CL ₁ of the tension coil spring 8 is displaced laterally from the position of the axis CL ₀ with the other end side of the tension coil spring 8 as the center. Then, it is displaced in the direction intersecting the axis CL ₀ . Along with this, the movable contact 6a ₁ (similar to the movable contact 6a ₂ ) on one end side of the movable member 6 is kept in contact with the fixed contact 5b in the direction intersecting the axis CL ₀ of the tension coil spring 8. Displace. At this time, as shown in the figure, the movable contact 6a ₁ (the same applies to the movable contact 6a ₂ ) is displaced (that is, rotated toward the side) so as to be laterally displaced with respect to the normally closed fixed contact 5b. Then, it slides with the normally closed fixed contact 5b.

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

When the actuator 7 is further operated beyond the state of FIG. 15, the movable member 6 is inverted, and the movable member 6 is moved from the upper position on the normally closed fixed contact 5b side to the lower position on the normally open fixed contact 4b side. It moves, which switches the contacts.

[First modification]
In the above embodiment, as shown in FIG. 10, a part of the first end portion 30A ₁ of the first columnar member 30A of the support frame 30 is embedded in the base 2 and fixed to the base 2. As shown, 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 be the entire first end portion 30A ₁ .

[Second modification]
In the above embodiment, the extending portion 30A ₂ of the common terminal 3 is located below the connecting portion 30C from the first end portion 30A ₁ of the first columnar member 30A, that is, on the extension line of the first end portion 30A ₁ . Although an example of the arrangement is shown (see FIGS. 9, 10, and 13), the application of the present invention is not limited to this. The extension portion 30A ₂ may be arranged at a position deviated laterally from the first end portion 30A ₁ . In this case, the extension portion 30A ₂ is preferably arranged between the center line of the support frame 30 and the center line of the first columnar member 30A, and at this time, the extension portion 30A ₂ is the support frame. It extends downward from the connecting member 30C between the center line of 30 and the center line of the first columnar member 30A. Further, at this time, the first end portion 30A ₁ of the first columnar member 30A is embedded in the base 2, whereas the extension portion 30A ₂ may not be embedded in the base 2. You may.

[Third modification example]
In the above embodiment, an example in which the extension portion 30A ₂ is provided between the support frame 30 and the external connection terminal 3A is shown, but the extension portion 30A ₂ can be omitted. In that case, the common terminal 3 is composed of two parts, a support frame 30 and an external connection terminal 3A, and these parts are arranged separately. Between these parts, for example, an electric jumper wire is used. It suffices to connect in a targeted manner.

[Fourth variant]
FIG. 18 shows a microswitch according to a fourth modification of the present invention, in which the same reference numerals as those in the above embodiment indicate the same or corresponding parts.

In the micro switch 1 shown in FIG. 18, in the upper part of the extension portion 5c extending upward from the base 2 so as to support the contact attachment portion 5a of the normally closed fixed contact 5b from below (left in the figure). A protruding portion 9 is provided so as to project toward the side). The protrusion 9 is arranged at a position on the side of one end of the movable member 6 (on the back side of the drawing) with a predetermined distance from one end of the movable member 6, and is a movable member when viewed from the front direction. It overlaps with one end of 6. The protruding portion 9 functions as a regulating portion for regulating the lateral movement of one end of the movable member 6. In the above embodiment, a similar protrusion is shown, but it is not arranged laterally to one end of the movable member 6 and overlaps with one end of the movable member 6 when viewed from the front. do not have.

The reason for providing the protruding portion 9 as such a regulating portion is as follows.
One end of the movable member 6 on the free end side may move excessively toward the side due to vibration or impact during transportation of the micro switch 1 or due to an impact when the micro switch 1 is dropped during installation. Further, when the movable contact 6a on one end side of the movable member 6 returns from the lower position on the normally open fixed contact 4b side to the upper position on the normally closed fixed contact 5b side, the movable contact 6a is described above with respect to the normally closed fixed contact 5b. Since it tries to displace in the direction opposite to the displacement direction at the time of the reversing operation, it is conceivable that the amount of movement of one end of the movable member 6 to the side increases due to the inertia at that time. In such a case, by bringing one end of the movable member 6 into contact with the protruding portion 9, it is possible to prevent the amount of lateral movement of one end of the movable member 6 from becoming excessive, and to prevent the other end of the movable member 6 from becoming excessive. This is to avoid a state in which the support frame 30 is detached from the first and second columnar members 30A and 30B.

[Other variants]
The above-mentioned examples and each modification should be regarded as merely examples of the present invention in all respects, and are not limited. Those skilled in the art in the field to which the present invention relates will not deviate from the spirit and essential features of the present invention when considering the above teachings, even if not explicitly stated in the present specification. Various variants and other embodiments that employ the principle of can be constructed.

The present invention is useful for microswitches used as detection switches, operation switches, and the like.

1: Micro switch

2: Base

4b: Normally open fixed contact (second fixed contact)
5b: Normally closed fixed contact (first fixed contact)

6: Movable members 6a ₁ , 6a ₂ , 6a: Movable contacts

7: Actuator

8: Tension coil spring (tension spring)

9: Regulatory member

30: Support frame 30A: First columnar member 30A ₁ : First end 30B: Second columnar member 30B ₁ : Second end 30C: Connecting part (regulatory member)

CL ₀ , CL ₁ : Axis line

Jikkai Sho 63-129928 (see pages 2-4, 4 and 5)

Claims (12)

In the micro switch
A movable member having a movable contact at one end that can contact the first and second fixed contacts that are separated and fixed to the base, and the other end that is swingably supported by the support frame.
An actuator for reversing the movable member so as to move the movable contact from the first fixed contact side to the second fixed contact side.
A tension spring for applying a tensile force to the one end of the movable member is provided.
The support frame is arranged on both sides of the tension spring so that the first end of the support frame on one side of the tension spring is fixed to the base and said on the other side of the tension spring. The second end of the support frame is not fixed to the base,
A micro switch that features that. In claim 1,
During the reversing operation of the movable member, the second end of the support frame is displaced with respect to the first end under the action of the tensile force of the tension spring.
A micro switch that features that. In claim 1,
At the time of the reversing operation of the movable member, the displacement amount of the second end portion of the support frame is larger than the displacement amount of the first end portion under the action of the tensile force of the tension spring.
A micro switch that features that. In claim 1,
During the reversing operation of the movable member, the movable contact is displaced in a direction intersecting the axial direction of the tension spring before the operation of the movable contact under the action of the tensile force of the tension spring. Is sliding with respect to the fixed contact,
A micro switch that features that. In claim 1,
The support frame is disposed on one side of the tension spring and has a first columnar member having the first end and extending in the height direction, and the support frame is arranged on the other side of the tension spring. A second columnar member that is provided and has the second end and extends in the height direction, and a connecting member that connects the first and second columnar members.
A micro switch that features that. In claim 5,
The support frame is formed of the first and second columnar members and the connecting member in a substantially U-shape or a substantially U-shape.
A micro switch that features that. In claim 5,
The height dimension of the connecting member becomes smaller from the side of the first columnar member toward the side of the second columnar member.
A micro switch that features that. In claim 7,
The connecting member is a tapered member.
A micro switch that features that. In claim 5,
The other end of the movable member is bifurcated, one of the other ends is supported by the first columnar member of the support frame, and the other end of the support frame is the second columnar of the support frame. Supported by members,
A micro switch that features that. In claim 1,
One end of the tension spring is locked to the one end of the movable member, and the other end is locked to the actuator.
A micro switch that features that. In claim 10,
During the reversing operation of the movable member, the movable member rotates around the other end of the tension spring, so that the movable contact slides with respect to the fixed contact.
A micro switch that features that. In claim 1,
A regulating member for restricting the lateral movement of the one end of the movable member is provided on the side of the one end of the movable member.
A micro switch that features that.

Images