TW201820368A - Switch device for variable resistor - Google Patents

Abstract

The displacement of a spring member in a direction approaching a substrate is regulated while securing the durability of a rotating member. The invention includes a substrate (100a), switch terminals (120c, 120d), a rotatably disposed cam (140a), a rotating member (130a) for switching the connection state between the switch terminals (120c, 120d) according to the rotation of the cam (140a), a spring member (150a) with one end being engaged with the rotating member (130a) while the other end being engaged with the cam (140a), for rotating the rotating member (130a) in accordance with the rotation of the cam (140a), and a regulating member (139) provided on the rotating member (130a) for regulating the displacement of the spring member (150a) in the direction approaching the substrate (100a), wherein at the time of the above regulation, the spring member (150a) has portions which are not supported by other members on both sides in the longitudinal direction of a portion contacting the regulating member (139).

Description

Switching device for variable resistor

The present invention relates to a switching device for a variable resistor.

Patent Document 1 describes a switching device 10 for a variable resistor as shown in FIG. 1 . Such a variable resistor switching device 10 is for switching ON/OFF of a power supply of a variable resistor (not shown) for adjusting the volume of an audio device equipped in the automobile. Specifically, the variable resistor switching device 10 shown in FIG. 1 includes a rotating shaft (not shown) that rotates together with an operating shaft (not shown) of the variable resistor, a substrate 100, and a pair of switching terminals 120a and 120b. The rotating member 130, the cam 140, and the spring member 150.

The rotating member 130 and the cam 140 are rotatably supported by the substrate 100. By rotating such a rotating member 130, the first state in which the pair of switching terminals 120a and 120b are not turned on (the state shown in FIG. 1) and the pair of switching terminals 120a and 120b can be electrically connected to each other by the rotating member 130. The second state (not shown). One end of the spring member 150 is locked to the rotating member 130, and the other end thereof is locked to the cam 140. Such a spring member 150 rotates the rotating member 130 in accordance with the rotation of the cam 140.

In the variable resistor switch device 10 described in Patent Document 1 having the above configuration, when the cam 140 rotates from the state shown in FIG. 1 (that is, the power-off state) to the clockwise direction in FIG. The spring member 150 rotates the rotating member 130 in the counterclockwise direction of FIG. 1 in accordance with the rotation of the cam 140. Further, the movable contact pieces 131a and 131b of the rotary member 130 are in contact with the pair of switch terminals 120a and 120b. As a result, the pair of terminals 120a and 120b are turned on by the rotating member 130 (that is, the power-on state). Further, when the cam 140 rotates from the power-on state to the counterclockwise direction of FIG. 1 as the rotation of the rotation shaft, the spring member 150 rotates the rotation member 130 in the clockwise direction of FIG. 1 according to the rotation of the cam 140, whereby the switch device 10 Becomes the power off state.

[PRIOR ART DOCUMENT] [Patent Document] Patent Document 1: Japanese Laid-Open Publication No. 61-144607

[Problems to be Solved by the Invention] However, in the invention described in Patent Document 1, when the power source switching operation is repeated, for example, in the state shown in FIG. 1, the spring member 150 is not supported by other members. The portion (specifically, the portion indicated by the oblique lattice α in FIG. 1) is displaced toward the substrate 100 such that the locked state between one end of the spring member 150 (the upper end portion in FIG. 1) and the rotating member 130 becomes Easy to get rid of. In the configuration described in Patent Document 1, the movable contact piece 131a of the rotating member 130 can support the intermediate portion of the spring member 150 in the longitudinal direction from the substrate 100 side. However, since the contact area between the movable contact piece 131a and the spring member 150 is large, the durability of the rotating member 130 may be lowered due to wear.

SUMMARY OF THE INVENTION An object of the present invention is to realize a structure that ensures the durability of a rotating member while at the same time the portion of the spring member that is not supported by the other member is difficult to be displaced in the direction toward the substrate.

A switching device for a variable resistor according to the present invention includes: a substrate; a pair of terminals supported by the substrate; a cam portion rotatably disposed on the substrate; and a rotating member disposed on the substrate, according to rotation of the cam portion Switching a connection state between the pair of terminals; a spring member having one end locked to the rotating member, the other end locked to the cam portion, rotating the rotating member according to rotation of the cam portion; and a restricting member disposed at the On the rotating member, the spring member is restricted from being displaced toward the substrate, wherein the spring member has a portion on both sides in the longitudinal direction of the portion in contact with the restricting member that is not supported by the other member during the restriction.

[Effect of the Invention] According to the present invention, the durability of the rotating member can be ensured, and at the same time, the spring member can be restricted from being displaced in the direction toward the substrate.

An example of an embodiment of the switching device for a variable resistor of the present invention will be described in detail with reference to Figs. 2 to 8 .

[1 About Variable Resistor with Switch]

First, an outline of the configuration of a variable resistor with a switch to which the switching device for a variable resistor of the present invention is mounted will be described with reference to Fig. 2 . Fig. 2 is a perspective view showing a variable resistor with a switch in which a switching device for a variable resistor of the present invention is mounted.

The variable resistor 1 with a switch shown in FIG. 2 includes an operating shaft 20, a variable resistor 30, and a switching device 10a.

The operation shaft 20 is a member for performing operations such as rotation by a user to change the resistance of the variable resistor 30, and ON/OFF of the power supply of the switching device 10a (hereinafter, simply referred to as "power switch" operating").

The variable resistor 30 changes the magnitude of the resistance between the resistor terminals 300a, 300b in accordance with the rotation of the operating shaft 20. In addition, the configuration of the variable resistor 30 is basically the same as the configuration of the conventional variable resistor of the above-described Patent Document 1, and therefore detailed description thereof will be omitted.

The switching device 10a corresponds to a component of the switching device for a variable resistor of the present invention, and is disposed in a state adjacent to the variable resistor 30. Such a switching device 10a switches between a power-on state in which the switching terminals 120c and 120d are electrically connected to each other and a power-off state in which the switching terminals 120c and 120d are not electrically connected to each other in accordance with the rotation of the operating shaft 20. The specific structure of the switching device 10a will be described later.

[2 Overall structure of a switching device as an example of an embodiment]

Next, an outline of the overall configuration of the switching device 10a will be described with reference to Figs. 3A to 4 . The specific configuration of each part constituting the switch device 10a will be described after explaining the outline of the overall configuration of the switch device 10a. Fig. 3A shows the power-off state of the switching device 10a omitting the housing member 170. Fig. 3B shows the power-on state of the switching device 10a omitting the housing member 170. Fig. 4 is an exploded perspective view showing the switch device 10a.

The switch device 10a includes a substrate 100a, a case member 170, a pair of switch terminals 120c and 120d, a rotating shaft 160, a rotating member 130a, a cam 140a, a spring member 150a, and a regulating member 139.

The substrate 100a is combined with the housing member 170 to constitute a switch housing having an inner space of a substantially rectangular parallelepiped shape. The pair of switch terminals 120c, 120d are held on the substrate 100a in a state in which one of the portions is extended to the outer space of the switch case. Further, one side surface of the substrate 100a forming the internal space of the switch case supports the rotating shaft 160, the rotating member 130a, the cam 140a, and the spring member 150a.

The rotating shaft 160 transmits the rotation of the operating shaft 20 (see Fig. 2) to the cam 140a. The spring member 150a straddles and is hung between the cam 140a and the rotating member 130a, and rotates the rotating member 130a in accordance with the rotation of the cam 140a. When the rotating member 130a rotates in accordance with the rotation of the cam 140a, the first state in which the pair of switching terminals 120c and 120d are not electrically connected to each other (that is, the state shown in FIG. 3A) and the pair of switching terminals 120c and 120d are obtained by rotating the member. The second state in which 130a is electrically connected to each other (i.e., the state shown in Fig. 3B).

With the above-described switching device 10a, when the operating shaft 20 is rotated from the power-off state shown in Fig. 3A to a predetermined direction, the rotation is transmitted to the cam 140a by the rotating shaft 160. Then, the spring member 150a elastically deforms with the rotation of the cam 140a while rotating the rotating member 130a. As a result, the pair of switching terminals 120c and 120d are turned on by the rotating member 130a.

On the other hand, when the operating shaft 20 is rotated from the power-on state to the direction opposite to the predetermined direction, the rotation is transmitted to the cam 140a by the rotating shaft 160. Then, the spring member 150a elastically deforms with the rotation of the cam 140a while rotating the rotating member 130a. As a result, at least one of the pair of switching terminals 120c and 120d is separated from the pair of switching terminals 120c and 120d, and the pair of switching terminals 120c and 120d are in a power-off state in which they are not electrically connected to each other.

Further, when the power switch operation of the switch device 10a is performed, the regulating member 139 restricts the displacement of the spring member 150a in the direction toward the substrate 100a.

[2.1 Structure of each part of the switchgear]

3A to 8, the substrate 100a constituting the switch device 10a, the case member 170, the pair of switch terminals 120c and 120d, the rotary shaft 160, the rotating member 130a, the cam 140a, the spring member 150a, and the restricting member are provided. The specific structure of 139 is explained.

In the following description of the present embodiment, for convenience of explanation, the Cartesian coordinate systems (W, L, T) shown in FIGS. 3A, 3B, and 5 are used for the directions of the respective portions. In the Cartesian coordinate system (W, L, T), the "positive direction" of the W axis is the right side of each figure, the "positive direction" of the L axis is the upper side of each figure, and the "positive direction" of the T axis is the figure of each figure. positive.

In the assembled state, the W-axis direction is also referred to as the "width direction" of the switch device 10a and the substrate 100a. In the assembled state, the L-axis direction is also referred to as the "longitudinal direction" of the switch device 10a and the substrate 100a. Further, in the assembled state, the T-axis direction is also referred to as the "height direction" of the switch device 10a and the substrate 100a.

"One side" in "width direction", "longitudinal direction" and "height direction" corresponds to the "positive direction" of the W axis, the L axis, and the T axis. On the other hand, the "other side" of "width direction", "longitudinal direction" and "height direction" corresponds to the "negative direction" of the W axis, the L axis, and the T axis.

[2.1.1 About the substrate]

In the present embodiment, as shown in FIG. 5, the substrate 100a has a rectangular plate-shaped substrate body 101 and side wall members 102 provided at the other end portion of the substrate body 101 in the longitudinal direction. Such a substrate body 101 constitutes a lower wall of the rectangular parallelepiped switch housing, and the side wall member 102 constitutes one of the four side walls of the switch housing.

The substrate body 101 has a through hole 103, a substrate-side shaft support portion 105, an avoidance recess portion 106, a guide recess portion 107, and a contact piece arrangement portion 108.

The through hole 103 is formed at a slightly central portion of the substrate body 101. The rotating shaft 160 can be inserted into the inner side of such a through hole 103.

The substrate-side shaft support portion 105 supports a cam 140a to be described later and a pivot 143 as a rotation center of the rotating member 130a. Such a substrate-side shaft support portion 105 is a through hole formed at an end portion of one side of the substrate body 101 in the width direction and at the other end portion of the longitudinal direction (that is, the lower right side of FIG. 5). In addition, the pivot 143 is disposed in parallel with the rotating shaft 160.

The avoidance recess 106 prevents interference between the front end portion of the first locking portion 152 of the spring member 150a and the substrate body 101. Such an avoidance recess 106 is formed in an arcuate recessed portion in which the through hole 103 is sandwiched in one side surface of the substrate body 101, and is formed on a portion opposite to the substrate side shaft support portion 105 (ie, FIG. 5). The top left).

The guiding recess 107 guides the rotation of the rotating member 130a by engaging with the movable-side guiding piece 135 of the rotating member 130a. Such a guide recess 107 is formed in an arcuate recess at a position on one side of the substrate body 101 on the other side of the longitudinal direction of the avoidance recess 106 (the lower side of FIG. 5).

The contact piece arrangement portion 108 is provided with a fixed side contact piece 122 of one of the pair of switch terminals 120c and 120d. Such a contact piece arrangement portion 108 is formed by a slit 111 located on an end surface of one side in the width direction of the substrate body 101.

[2.1.2 About housing components]

The housing member 170 has a rectangular plate-like upper wall member 171 constituting the upper wall of the switch housing and three rectangular plate-shaped side wall members 172 constituting three of the four side walls of the switch housing. The housing member 170 as described above is assembled to the substrate 100a to constitute a switch housing.

[2.1.3 About a pair of switch terminals]

The pair of switch terminals 120c and 120d correspond to a pair of terminals and are wires made of metal. Further, the pair of switch terminals 120c and 120d are buried in the substrate 100a with the respective distal end portions 121a and 121b exposed to the outside. Such a pair of switch terminals 120c and 120d are embedded in the substrate 100a by injection molding (insert molding).

Specifically, the front end portion 121a of one of the switch terminals 120c protrudes from the other end surface (the lower end surface of FIG. 3A) of the substrate body 101 toward the outside of the substrate body 101. Further, one switch terminal 120c has a rectangular side plate-shaped fixed side contact piece 122. Such a fixed side contact piece 122 is exposed to the outside from the bottom of the slit 111 of the substrate body 101, and is disposed on the contact piece arrangement portion 108. Further, the front end portion 121a of the one for the switch terminal 120c and the fixed side contact piece 122 are electrically connected by a connection portion (not shown) embedded in the substrate body 101.

The other end portion 121b of the other switch terminal 120d protrudes outward from the other end of the longitudinal direction of the substrate body 101. Further, the base end portion of the other switch terminal 120d is electrically connected to the rotating member 130a by a pivot 143 supported by the substrate-side shaft support portion 105 of the substrate body 101. Furthermore, the number of terminals for switching is not limited to this embodiment.

[2.1.4 About the rotary axis]

The rotating shaft 160 will be described with reference to Figs. 3A to 4 .

The rotation shaft 160 is coaxially fixed to the operation shaft 20 at the end of the other side of the operation shaft 20 (refer to FIG. 2) in the axial direction (in other words, the height direction). Such a rotating shaft 160 rotates together with the operating shaft 20. The rotating shaft 160 may be constituted by a shaft member that is integrally or separately provided with the operating shaft 20. Such a rotating shaft 160 rotates a cam 140, which will be described later, in accordance with the rotation of the operating shaft 20.

Specifically, in the present embodiment, the rotating shaft 160 is a hollow member made of synthetic resin. Further, the cross-sectional shape of the inner peripheral surface of the rotating shaft 160 (in other words, the cross-sectional shape perpendicular to the axial direction of the rotating shaft 160) is rectangular or elliptical. Such a rotating shaft 160 has a rotation support portion 161 and a transmission engagement portion 162.

The rotation support portion 161 rotatably supports the rotation shaft 160 with respect to the substrate 100a by being engaged with the substrate 100a.

The transmission engagement portion 162 transmits the rotation of the rotary shaft 160 to the cam 140a by engaging with a cam 140a to be described later. Such a transmission engagement portion 162 is a convex portion formed on the outer circumferential surface of the rotating shaft 160.

The rotating shaft 160 is externally fitted to the end of the operating shaft 20. In such a state, the rotation support portion 161 of the rotary shaft 160 is inserted into the through hole 103 of the substrate body 101. Thereby, the rotating shaft 160 is rotatably supported by the substrate 100a.

[2.1.5 About rotating parts]

The rotating member 130a will be described with reference to Figs. 3A to 4 and 6.

The rotating member 130a is rotatably supported by a pivot 143 supported by the substrate 100a. Such a rotating member 130a is always turned on by the pivot 143 and the other switching terminal 120d described above. Further, the rotating member 130a obtains a state (in other words, an ON state) and a state of no contact (in other words, a non-conduction state) in contact with one switching terminal 120c according to its own rotation angle.

Specifically, the rotating member 130a is a plate-shaped member made of metal, and has a shaft insertion hole 132, a movable side shaft support portion 133, a movable side lock portion 134, a movable contact piece 131c, and a movable side guide piece 135.

The shaft insertion hole 132 is for inserting the rotating shaft 160 into the inner side. Such a shaft insertion hole 132 is formed in a through hole on the annular portion 136 (see FIG. 6) of the rotating member 130a.

The movable side shaft support portion 133 is formed in a through hole in the first expansion portion 137 (refer to FIG. 6) extending outward from the annular portion 136 in the radial direction (specifically, the radial direction of the annular portion 136). A pivot 143 is inserted into such a movable side shaft support portion 133. In this manner, the rotating member 130a is supported on the substrate 100a in a state of being rotatable about the pivot 143.

Further, in the present embodiment, the pivot 143 is electrically connected to the base end portion of the other switching terminal 120d. Therefore, the movable side shaft support portion 133 corresponds to the first conductive portion that electrically connects the rotating member 130a and the other switching terminal 120d.

The other end of the spring member 150a is locked to the movable side locking portion 134. In the case of the present embodiment, the movable side locking portion 134 is formed in the second expansion portion 138 extending outward in the radial direction (specifically, the radial direction of the annular portion 136) from the annular portion 136 (refer to FIG. 6). ) through the hole. Further, in the case of the present embodiment, the annular portion 136, the first expanded portion 137, and the second expanded portion 138 correspond to the rotating member body.

According to the rotation of the rotating member 130a, the movable contact piece 131c is in a state of being in contact with the fixed side contact piece 122 of one of the switch terminals 120c (in other words, in an on state) and in a state in which it is not in contact with each other (in other words, in a non-conduction state). The movable contact piece 131c extends from the end portion (the right end portion of FIGS. 3A, 3B, and 6) of one of the outer circumferential edges of the annular portion 136 to the radially outer side of the annular portion 136. The movable contact piece 131c as described above corresponds to a second conductive portion that electrically connects the rotating member 130a and one switching terminal 120c.

The movable side guide piece 135 guides the rotation of the rotating member 130a by being engaged with the guide recess 107 of the substrate body 101. Such a movable side guide piece 135 extends in a state of being bent from the outer periphery of the annular portion 136 toward the direction in which the substrate body 101 is bent.

A state in which the pivot 143 supported by the substrate-side shaft supporting portion 105 of the substrate body 101 is inserted into the movable-side shaft supporting portion 133, and the movable-side guiding piece 135 is engaged with the guiding concave portion 107 of the substrate body 101 is as described above. The rotating member 130a is disposed on one side of the substrate body 101.

In this state, the rotating shaft 160 is inserted inside the through hole 132 of the rotating member 130a. The rotating member 130a is rotatable about the pivot 143 in a range in which the movable side guide piece 135 is displaceable inside the guide recess 107.

Such a rotating member 130a obtains a first state away from at least one of the pair of switching terminals 120c, 120d (in the case of the present embodiment, a switching terminal 120c) according to its own rotation angle (shown in FIG. 3A). State) and a second state (state shown in FIG. 3B) in which both of the pair of switch terminals 120c and 120d are contacted.

In the second state described above, the pair of switching terminals 120c and 120d are electrically connected to each other by the rotating member 130a. Furthermore, the first state corresponds to the power-off state of the switch device 10a, and the second state corresponds to the power-on state of the switch device 10a.

[2.1.6 About Cam]

The cam 140a will be described with reference to Figs. 3A to 4 and Fig. 7.

The cam 140a is supported by a pivot 143 in a state of being rotatable about the pivot 143, and the pivot 143 is supported by the substrate 100a. In addition, the cam 140a is disposed closer to one side of the substrate body 101 than the rotating member 130a. Such a cam 140a rotates around the pivot 143 in accordance with the rotation of the rotating shaft 160, thereby obtaining a first state (state shown in FIG. 3A) corresponding to the power-off state of the switching device 10a and a power-on corresponding to the switching device 10a. The second state of the state (the state shown in Fig. 3B).

Specifically, the cam 140a is entirely made of synthetic resin, and includes a cam body 141, and a cam side shaft support portion 142 provided at a base end portion of the cam body 141.

The cam body 141 has a cam side engagement portion 144 and a cam side locking portion 145.

The cam side engaging portion 144 is engaged with the transmission engaging portion 162 of the rotating shaft 160 to transmit the rotation of the rotating shaft 160 to the cam body 141. Such a cam side engaging portion 144 is a recess formed at a front end portion of one side (the surface of FIGS. 3A, 3B, 7) of the cam body 141.

The cam side locking portion 145 is for locking the other end portion of the spring member 150a. Such a cam side locking portion 145 is formed in a through hole of the cam body 141 at the bottom of the cam side engaging portion 144.

The cam side shaft support portion 142 supports the cam 140a with respect to the pivot 143 to enable the cam 140a to rotate about the pivot 143. Such a cam side shaft support portion 142 is a partial cylindrical member having a C-shaped cross section. Such a cam side shaft support portion 142 is integrally provided at a base end portion of the cam body 141.

The cam 140a as described above is supported in a state in which the pivot 143 is inserted into the cam side shaft support portion 142 in a state in which a portion of the support rotating member 130a is farther away from one side of the substrate body 101. In this state, the cam side engaging portion 144 of the cam body 141 can be engaged with the transmission engaging portion 162 of the rotating shaft 160. The rotation of the rotating shaft 160 is transmitted to the cam body 141 (i.e., the cam 140a) by the engaging portion between the transmission engaging portion 162 and the cam side engaging portion 144.

[2.1.7 About spring parts]

The spring member 150a will be described with reference to Figs. 3A to 4 .

The spring member 150a is made of a substantially arc-shaped metal wire having elasticity. In response to the rotation of the cam 140a, such a spring member 150a rotates the rotating member 130a in a direction opposite to the direction in which the cam 140a rotates.

Specifically, the spring member 150a has a spring body 151, a first locking portion 152, and a second locking portion 153.

The first locking portion 152 extends from one end portion of the spring body 151 toward the substrate body 101. On the other hand, the second locking portion 153 extends from the other end portion of the spring body 151 in a direction away from the substrate body 101.

When the spring member 150a as described above is mounted, the first locking portion 152 is inserted into the movable side locking portion 134 of the rotating member 130a from one side away from the substrate body 101, and the second locking portion 153 is inserted into the cam from one side close to the substrate body 101. In the cam side locking portion 145 of 140a. That is, in the height direction, the spring body 151 of the spring member 150a is disposed between the rotating member 130a and the cam 140a (specifically, the cam body 141).

In this state, according to the rotation of the cam 140a, the spring member 150a is switched between the two states by elastic deformation, that is, the first state in which the deflection amount of the spring member 150a is small (the state shown in FIG. 3A) and The second state (the state shown in Fig. 3B) in which the amount of deflection of the spring member 150a is large. Furthermore, the first state corresponds to the power-off state of the switch device 10a, and the second state corresponds to the power-on state of the switch device 10a.

[3. About restricted parts]

In the case of the present embodiment, the restricting member 139 restricts the displacement of the spring member 150a so as to include the supported portion 154 of the center position C (refer to Figs. 3A, 3B) in the longitudinal direction of the spring member 150a (the oblique lattice in Fig. 3B) The portion indicated is not displaced to a position closer to the substrate 100a than the rotating member 130a.

Hereinafter, the specific structure of the restricting member 139 will be described with reference to FIGS. 3A, 3B, 6, and 8. In the case of the present embodiment, in the power-on state of the switching device 10a shown in Fig. 3B, the restricting member 139 extends from the annular portion 136 of the rotating member 130a toward the radially outer side of the annular portion 136 so as to be at the height. The direction overlaps with the supported portion 154 of the spring member 150a. Such a regulating member 139 extends from the outer periphery of the annular portion 136 of the rotating member 130a toward the radially outer side of the annular portion 136.

In the case of the present embodiment, the base end portion of the restricting member 139 is overlapped with the spring member 150a in the height direction in the power-off state. Further, in the power-on state, the portion of the spring member 150a located on both sides in the longitudinal direction of the support portion 154 does not overlap the restriction member 139 in the height direction. That is, in the power-on state, both sides in the longitudinal direction of the supported portion 154 of the spring member 150a have portions that are not supported by other members from the side of the substrate body 101.

A support surface 139a is formed on the front end surface (the surface of FIGS. 3A, 3B, and 5, and the upper surface of FIG. 8) of the regulating member 139, and the support surface 139a overlaps the spring member 150a in the height direction at least when the state is changed. Such a support surface 139a has a shape in which the supported portion 154 of the spring member 150a is displaced in a direction away from the substrate body 101 (upward in FIG. 8) during the state transition.

Specifically, the support surface 139a is an inclined surface, and the more toward the outer side in the radial direction of the spring body 151, the more inclined it is away from the substrate body 101. In other words, the more toward the outer side in the radial direction of the spring body 151, the higher the height H of the support surface 139a. In the case of the present embodiment, the support surface 139a has a planar shape, that is, the outer side of the radial direction of the spring body 151, the support surface 139a is linearly separated from the substrate body 101. However, it is also possible to configure the support surface 139a as a curved surface, that is, toward the outer side in the radial direction of the spring body 151, the support surface 139a is curved away from the substrate body 101.

Such a support surface 139a is preferably a smooth surface to give the user a good operational feeling. Further, in the case of the present embodiment, the restricting member 139 is provided in a state of not contacting other members than the spring member 150a. In other words, the restricting member 139 is provided in a portion other than the first conductive portion and the second conductive portion (in the case of the present embodiment, the movable side shaft support portion 133 and the movable contact piece 131c) of the rotating member 130a.

Furthermore, the restriction member 139 is not limited to the configuration of the embodiment. For example, the restricting member may be configured to overlap the spring member 150a in the height direction only in the power-off state. Further, the restricting member may be configured to overlap the spring member 150a in the height direction in the power-off state and the power-on state. Further, when the switching device 10a performs state transition between the power-off state and the power-on state, the restriction member can be enlarged within a range in which the restriction member 139 does not interfere with components other than the spring member 150a. However, even in such a case, a configuration is formed in which the portion of the spring member 150a located on both sides in the longitudinal direction of the support portion 154 does not overlap the restriction member 139 in the height direction. In addition, the support surface of the restricting member may be a flat surface instead of an inclined surface.

[4. About the operation of the switchgear]

Hereinafter, the operation of the switch device 10a of the present embodiment will be described with reference to Figs. 3A and 3B. As described above, the switching device 10a switches between the power-on state in which the pair of switching terminals 120c, 120d are electrically connected to each other and the power-off state in which they are not electrically connected to each other. Furthermore, FIG. 3A shows the power-off state of the switching device 10a. On the other hand, Fig. 3B shows the power-on state of the switching device 10a.

[4.1 Operation when switching from the power off state to the power on state]

First, the operation of the switching device 10a when switching from the power-off state to the power-on state will be described. Further, the operation of the variable resistor 30 is substantially the same as that of the variable resistor known in the prior art, and thus the description thereof will be omitted.

When the user rotates the operating shaft 20 from the state shown in FIG. 3A to the clockwise direction of FIG. 3A, the rotating shaft 160 rotates together with the operating shaft 20 in the clockwise direction of FIG. 3A. Then, the transmission engaging portion 162 of the rotating shaft 160 is engaged with the cam side engaging portion 144 of the cam 140a.

Then, based on the engagement between the transfer engaging portion 162 and the cam side engaging portion 144, the cam 140a is rotated about the pivot 143 in the counterclockwise direction of FIG. 3A by a predetermined angle. With this rotation of the cam 140a, the spring member 150a is elastically deformed from the first state shown in Fig. 3A to the second state shown in Fig. 3B, so that the rotating member 130a is rotated about the pivot 143 in the clockwise direction of Fig. 3A. As a result, as shown in FIG. 3B, the movable contact piece 131c of the rotating member 130a comes into contact with the fixed side contact piece 122 of one of the switch terminals 120c.

As described above, the rotating member 130a is electrically connected to the other switching terminal 120d by the pivot 143. Therefore, the pair of switch terminals 120c and 120d are turned on (power-on state) by the rotating member 130a. In this power-on state, the supported portion 154 of the spring member 150a overlaps the restricting member 139 of the rotating member 130a in the height direction. On the other hand, the portions of the spring member 150a located on both sides in the longitudinal direction of the support portion 154 do not overlap the restriction member 139 in the height direction.

Further, with the rotation of the cam 140a, when the spring member 150a rotates the rotating member 130a in the clockwise direction of FIG. 3A, the spring member 150a is elastically deformed and is deflected from the first state shown in FIG. 3A (in other words, the curvature is small) It is converted into the second state in which the amount of deflection shown in Fig. 3B is large (in other words, the curvature is large).

At this time, the supported portion 154 of the spring member 150a is displaced to the outer side in the radial direction of the spring body 151. Further, when the above state is changed, the supported portion 154 of the spring member 150a is displaced in a state of contacting the support surface 139a of the regulating member 139. Therefore, the supported portion 154 of the spring member 150a is not displaced in the direction toward the substrate 100a.

Specifically, during the state transition described above, the portion of the support surface 139a of the restricting member 139 that is in contact with the supported portion 154 of the spring member 150a is located farther from one side of the substrate body 101 than one side of the rotating member 130a. Furthermore, during the state transition described above, the supported portion 154 of the spring member 150a is guided by the support surface 139a of the restricting member 139 to a direction away from the substrate 100. At this time, it is difficult for the force in the direction in which the movable-side locking portion 134 of the rotating member 130a is disengaged to act on the first locking portion 152 of the spring member 150a. Further, in the power-on state, the spring member 150a energizes the rotating member 130a in the predetermined direction based on its own elastic deformation.

[4.2 Operation when switching from the power-on state to the power-off state]

Next, the operation of the switching device 10a when switching from the power-on state to the power-off state will be described.

When the user rotates the operating shaft 20 from the state shown in FIG. 3B to the counterclockwise direction in FIG. 3B, the rotating shaft 160 rotates counterclockwise in FIG. 3B together with the operating shaft 20. Then, based on the engagement between the transmission engaging portion 162 of the rotating shaft 160 and the cam side engaging portion 144 of the cam 140a, the cam 140a is rotated about the pivot 143 in the clockwise direction of FIG. 3B by a predetermined angle.

With this rotation of the cam 140a, the spring member 150a is elastically deformed from the second state shown in Fig. 3B to the first state shown in Fig. 3A, so that the rotating member 130a is rotated about the pivot 143 in the counterclockwise direction of Fig. 3B.

Then, as shown in FIG. 3A, the movable contact piece 131c of the rotating member 130a is separated from the fixed side contact piece 122 of one of the switch terminals 120c. In this state, the pair of switching terminals 120c and 120d are not electrically connected to each other as shown in Fig. 3A. In the power-off state, the entire length of the spring body 151 of the spring member 150a overlaps the rotating member 130a in the height direction.

Further, when the spring member 150a rotates the rotating member 130a in the counterclockwise direction of FIG. 3B in association with the rotation of the cam 140a, the spring member 150a is converted from the second state in which the amount of deflection shown in FIG. 3B is large (in other words, the curvature is large) to The first state in which the amount of deflection shown in Fig. 3A is small (in other words, the curvature is small). At this time, the supported portion 154 of the spring member 150a is displaced toward the inner side in the radial direction of the spring body 151.

Further, when the above state is changed, the supported portion 154 of the spring member 150a is displaced in a state of contacting the support surface 139a of the regulating member 139. At this time, although the supported portion 154 of the spring member 150a is displaced in the direction toward the substrate 100a, it is not displaced in the direction closer to the substrate body 101 than the one side surface of the rotating member 130a.

[5 Notes]

In an example of the embodiment, the pivot 143 is provided separately from the substrate 100a. However, a pivot portion (not shown) equivalent to the pivot 143 may be integrally provided with the substrate 100a. In this case, the cam 140a and the rotating member 130a are rotatably supported by the above-described pivot portion. Further, in an example of the present embodiment, the axis which is the center of rotation of the cam 140a and the axis which is the center of rotation of the rotating member 130a are each constituted by the pivot 143. However, the axis which is the center of rotation of the cam 140a and the axis which is the center of rotation of the rotating member 130a may be constituted by other axes.

[6 The role and effect of an example of an embodiment]

According to the switching device 10a of the present embodiment having the above configuration, the durability of the rotating member 130a can be ensured, and the spring member 150a can be prevented from being displaced to a position closer to the substrate 100a than one side surface of the rotating member 130a.

That is, in the case of the present embodiment, when the switching device 10a is switched from the power-off state to the power-on state, in the spring member 150a, the supported portion 154 is in contact with the restriction member 139, and is located at the supported portion 154. Portions on both sides in the longitudinal direction are not in contact with the restricting member 139. Therefore, when the above state is changed, the contact area between the spring member 150a and the rotating member 130a (i.e., the restricting member 139) can be reduced. As a result, the wear between the spring member 150a and the rotating member 130a at the time of state transition can be reduced, thereby improving the durability of the rotating member 130a.

Further, the rotating member 130a is provided with a restricting member 139 that overlaps with the supported portion 154 of the spring member 150a in the height direction in the power-on state shown in FIG. 3B. When the state is changed, the supported portion 154 of the spring member 150a is displaced in the direction away from the substrate body 101 (in other words, elastically deformed) during contact with the support surface 139a. Therefore, the supported portion 154 of the spring member 150a is restricted by the support surface 139a of the restricting member 139 from being displaced to a position closer to the substrate 100a than one side of the rotating member 130a when the state is changed. As a result, the force in the direction in which the movable side locking portion 134 of the rotating member 130a is disengaged hardly acts on the first locking portion 152 of the spring member 150a, so that the first locking portion 152 of the spring member 150a and the movable side of the rotating member 130a are locked. The engagement between the portions 134 is difficult to disengage.

Further, in the case of the present embodiment, it is not necessary to separately provide the detachment preventing structure, and the first locking portion 152 of the spring member 150a can be prevented from coming off from the movable side locking portion 134 of the rotating member 130a. As a result, the number of parts can be reduced, thereby reducing manufacturing costs.

Further, since the restricting member 139 as described above can be integrally formed with the rotating member 130a by press forming and bending forming, the number of parts is not increased.

Further, in the case of the present embodiment, when the switching device 10a is switched from the power-off state to the power-on state, the supported portion 154 of the spring member 150a is guided by the support surface 139a of the restriction member 139, during the state transition described above. Displaced away from the direction of the rotating member 130a. Therefore, it is possible to prevent mutual interference between the spring member 150a and the rotating member 130a when the above state is changed. As a result, abrasion between the spring member 150a and the rotating member 130a can be prevented, thereby improving the durability of the switch device 10a and improving the operational feeling brought to the user.

[Industry use possibility]

The switching device for a variable resistor of the present invention can be applied to a switching device of a variable resistor of various configurations.

1‧‧‧Variable resistors with switches

10, 10a‧‧‧ switchgear

20‧‧‧Operating shaft

30‧‧‧Variable Resistor

100, 100a‧‧‧ substrate

101‧‧‧Substrate body

102, 172‧‧‧ side wall components

103‧‧‧through hole

105‧‧‧Substrate side shaft support

106‧‧‧ Avoiding the recess

107‧‧‧Guide recess

108‧‧‧Contact sheet configuration department

111‧‧‧Incision

120a, 120b, 120c, 120d‧‧‧switch terminals

121a, 121b‧‧‧ front end

122‧‧‧Fixed side contact piece

130, 130a‧‧‧Rotating parts

131a, 131b, 131c‧‧‧ movable contact piece

132‧‧‧Axis insertion hole

133‧‧‧ movable side axle support

134‧‧‧ movable side locking part

135‧‧‧ movable side guide piece

136‧‧‧Round Department

137‧‧‧First Expansion Department

138‧‧‧Second Expansion Department

139‧‧‧Restricted parts

139a‧‧‧Support surface

140, 140a‧‧‧ cam

141‧‧‧Cam body

142‧‧‧Cam side shaft support

143‧‧‧ pivot

144‧‧‧Cam side engagement

145‧‧‧Cam side locking part

150, 150a‧‧‧ spring parts

151‧‧‧Spring body

152‧‧‧First Locking Department

153‧‧‧Second lock

154‧‧‧Supported Department

160‧‧‧Rotary axis

161‧‧‧Rotary support

162‧‧‧Transfer and Engagement Department

170‧‧‧Shell components

171‧‧‧Upper wall components

300a, 300b‧‧‧Resistors terminals

C‧‧‧Center position in the length direction of the spring part

H‧‧‧The height of the support surface

1 is a plan view showing the structure of a switching device for a variable resistor of a conventional structure; FIG. 2 is a perspective view for explaining an outline of a variable resistor with a switch having a switching device for a variable resistor of the present invention; Fig. 3A is a plan view showing a state in which a power-off state of a switching device for a variable resistor according to an embodiment of the present invention is omitted in a state in which a housing element is omitted. Fig. 3B is a view showing a variable resistor of an example of the embodiment. FIG. 4 is an exploded perspective view showing a switching device for a variable resistor according to an example of the embodiment; FIG. 5 is a variable view of an example of the embodiment; Fig. 6 is a plan view showing a rotating member of a switching device for a variable resistor according to an example of the embodiment; Fig. 7 is a view showing a switch for a variable resistor according to an example of the embodiment; A plan view of the cam of the apparatus; and Fig. 8 is a schematic cross-sectional view corresponding to the AA section of Fig. 3B.

Claims (3)

A switching device for a variable resistor, comprising: a substrate; a pair of terminals supported by the substrate; a cam portion rotatably disposed on the substrate; and a rotating member disposed on the substrate and switched according to rotation of the cam portion a state of connection between the pair of terminals; a spring member having one end locked to the rotating member, the other end being locked to the cam portion, rotating the rotating member according to rotation of the cam portion; and a restricting member disposed at the rotation On the component, the displacement of the spring member in a direction close to the substrate is restricted, wherein the spring member has a portion on both sides in the longitudinal direction of the portion in contact with the restriction member that is not supported by the other member during the restriction. The switching device for a variable resistor according to claim 1, wherein the restricting member is in contact with the spring member at a position farther from the substrate than the rotating member. The switching device for a variable resistor according to claim 1, wherein, when the cam portion rotates, the rotating member is rotated by a portion that locks the spring member by being pressed by one end of the spring member, the spring The portion of the member that contacts the restricting member is a circular arc shape. When the cam portion rotates, the restricting member moves toward the outer side in the radial direction of the spring member, and the height of the restricting member increases toward the outer side in the radial direction. .