JP2005136275A - Rotation operation type electric component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation operation type electric component which enables miniaturization, realizes a low cost, and maintains operation disable state with a stem getting in a main body when excessive thrust is applied. <P>SOLUTION: A projector 10c which extends in a direction perpendicular to an axial direction facing the opening part of a shaft hole 8e is formed integrally with an operation shaft 10 which projects outside from the shaft hole 8e of a bearing 8 locked to one end side of a housing 1 and is held to rotate inside the housing 1. When a usual first pressing force is applied in the axial direction of the operation shaft 10, the projection part 10c functions as a stopper. When an excessive second pressing force is applied in an axial direction of the operation shaft 10, the projection part 10c collides with the opening part of the shaft hole 8e and is broken. Since the broken part 10d breaks into the shaft hole 8e, the rotation of the operation shaft 10 is blocked. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotary operation type electrical component, and more particularly, to a structure of a rotary operation type electrical component used for various controls of an electronic device such as an audio device.

  The structure of the conventional rotary operation type electric component includes a main body portion that outputs an electric signal by operation of the operation shaft, a receiving member and a knob portion inserted through the tip of the operation shaft, and between the receiving member and the knob portion. The elastic member is urged to push the knob part forward, and when the knob part is pressed with an excessive pressing force, the elastic member is compressed and the knob part enters the receiving member, The thing of the structure which reduces the protrusion amount of a part is known (for example, refer patent document 1).

Hereinafter, the structure of a conventional rotary operation type electric component will be described with reference to the drawings.
FIG. 7 is a side view, partly in section, showing a conventional rotary operation type electrical component, and FIG. 8 is an explanatory view for explaining the operation of the conventional rotary operation type electrical component.

  As shown in the figure, the electrical component 110 includes a main body 101 that outputs a predetermined electric signal (for example, a resistance value signal, an on / off signal, etc.), an operation shaft 102 for operating the main body 101, A knob portion 105 inserted through the operation shaft 102 and an elastic member 106 that urges the knob portion 105 to push forward between the main body portion 101 and the knob portion 105 are roughly configured.

  The main body portion 101 is made of an insulating material, and has a substantially box-shaped housing portion 101a, a substantially cylindrical bearing portion 101b made of a metal material that protrudes outward from the housing portion 101a, and outward from the housing portion 101a. And a plurality of terminals 101c projecting from each other. In addition, a known rotary variable resistor 101d made of a resistor, a common electrode, a substrate, or the like (not shown) is disposed on one end side of the casing 101a, and a fixed contact or a movable contact (not shown) is disposed on the other end side. A known push switch 101e is arranged.

  The operation shaft 102 includes a substantially cylindrical shaft portion 103 that is inserted into the bearing portion 101 b and protrudes outward, and a receiving member 104 that is integrated with the shaft portion 103. The shaft portion 103 of the operation shaft 102 is disposed in the housing portion 101a so that the variable resistor 101d and the push switch 101e can be operated while being inserted into the bearing portion 101b.

  In this state, the variable resistor 101d outputs a resistance value signal as an electric signal by rotating the operation shaft 102, and the push switch 101e generates an electric signal as an electric signal by pressing the operation shaft 102 in the axial direction. An on / off signal is output.

  The receiving member 104 is made of an insulating material, and has a substantially prismatic base portion 104a, a hole portion 104b provided in the axial direction of the shaft portion 103 from one end portion of the base portion 104a, and one end portion side of the base portion 104a. Thus, a substantially disc-shaped holding portion 104c having a plane orthogonal to the axis of the shaft portion 103, and a plurality of rectangular holes 104d are provided in the holding portion 104c.

  The knob portion 105 is made of an insulating material, and is provided at a position facing the surface wall 105c and the side wall 105d extending substantially orthogonally to the surface wall 105c from the periphery of the arc-shaped surface wall 105c and the surface wall 105c. And a substantially cylindrical operation portion 105a having a substantially rectangular recess 105f formed at the center of the back wall 105e, and outward from the back wall 105e of the operation portion 105a. And a pair of locking portions 105b projecting from each other. A convex portion 105g for locking by snap-in is formed at the free ends of the pair of locking portions 105b.

  The knob 105, the elastic member 106, and the receiving member 104 are first inserted into the base 104a of the receiving member 104, and the base 104a is housed in the recess 105f of the knob 105. At this time, the convex portions 105g of the pair of locking portions 105b are snap-in coupled to the holes 104d of the holding portion 104c.

In this state, the elastic member 106 is disposed between the holding portion 104 c of the receiving member 104 and the back wall 105 e of the knob portion 105 in a state of being pressed. The elastic member 106 is biased with a predetermined biasing force (f2) so as to push the knob portion 105 forward of the axis. The predetermined urging force: f2 is configured to be a stronger force (f1 <f2) than the predetermined pressing force: f1 for pushing the push switch 101e.
Therefore, the knob portion 105 is configured to be movable in the axial direction (arrow B and C directions) of the receiving member 104 while resisting the elasticity of the elastic member 106.

  Further, when the knob portion 105 is pressed with a pressing force f4 stronger than the predetermined urging force f2, the operation shaft 102 moves in the arrow B direction by the movement of the knob portion 105 and the push switch is turned on. Furthermore, the knob portion 105 moves in the arrow B direction against the urging force f2 of the elastic member 106. As a result, the electrical component 110 can be prevented from being damaged.

JP 2001-35299 A

  However, in the conventional rotary operation type electric component described above, the structure of the operation body is complicated, and the knob portion 105 needs the space concave portion 105f in which the base portion 104a of the receiving member 104 is accommodated. There was a problem of becoming.

  Therefore, the present invention solves the above-described problems, can be reduced in size, can be reduced in cost, and when an excessive pressing force is applied, the shaft can enter the main body and maintain an inoperable state. An object is to provide a rotary operation type electrical component.

  In order to solve the above-mentioned problems, in the present invention, as a first solving means, a housing having a housing portion, a bearing having a shaft hole engaged with one end side of the housing, and outward from the shaft hole And an operation shaft that is rotatably held in the housing, a rotating plate that has a movable contact and is rotated in accordance with the rotation operation of the operation shaft, and the movable portion that is disposed in the storage portion. A fixed contact that is in sliding contact with the contact, and the operation shaft is integrally formed with a projecting piece that faces the opening of the shaft hole and extends in a direction perpendicular to the axial direction. It functions as a stopper when a normal first pressing force is applied in the axial direction of the operation shaft, and an excessive second pressing force greater than the first pressing force is applied in the axial direction of the operation shaft. In this case, the protruding piece collides with the opening of the shaft hole and is destroyed, and this broken portion is in contact with the shaft hole. It has a configuration which is adapted to prevent rotation of the operating shaft by way to push are.

  As a second solution, a detection switch that holds the operation shaft in the casing so as to be slidable in the axial direction, and operates in the housing portion of the casing as the operation shaft slides. A return spring, and when the first switch is applied to the operating shaft when the detection switch is operated in response to the pressing operation of the operating shaft, the projecting piece portion contacts the opening of the shaft hole. By contacting and functioning as a stopper, the operating shaft can be returned by the urging force of the return spring, and when the second pressing force is excessively applied to the operating shaft, the protruding piece portion is The configuration is such that the operation shaft is prevented from returning by colliding with the opening of the shaft hole and being broken, and the broken portion biting into the shaft hole.

As a third solution, the projecting piece portion is configured such that the shaft diameter located outside the projecting piece portion is smaller than the shaft diameter inserted through the shaft hole. It was set as the structure formed with the different shaft diameter on both sides.
As a fourth solution, the operation shaft and the bearing are both made of a metal material.
Further, as a fifth solving means, the projecting piece portion is formed in a disk-like bowl shape.

  As described above, the rotary operation type electrical component of the present invention has a housing having a storage portion, a bearing having a shaft hole engaged with one end side of the housing, and protruding outward from the shaft hole. And an operation shaft that is rotatably held in the housing, a rotating plate that has a movable contact and is rotated in accordance with the rotation operation of the operation shaft, and a fixed contact that is disposed in the storage portion and is in sliding contact with the movable contact. The operation shaft is integrally formed with a projecting piece portion facing the opening of the shaft hole and extending in a direction orthogonal to the axial direction, and the projecting piece portion is a first push in the axial direction of the operation shaft. It functions as a stopper when pressure is applied, and when an excessive second pressing force greater than the first pressing force is applied in the axial direction of the operating shaft, the projecting piece collides with the opening of the shaft hole. Since the destruction part bites into the shaft hole and prevents the operation shaft from rotating, the operation shaft is excessively large. When a pressing force is applied, the projecting piece of the operating shaft breaks and bites into the shaft hole, preventing rotation of the operating shaft, so the operating body such as a knob attached to the operating shaft must have a complicated structure. In addition, it is possible to provide a rotary operation type electric component that can be reduced in size and can be reduced in cost and can be reduced in cost (a regulation that the operation knob does not protrude more than a predetermined amount when excessive pressing force is applied). .

  The operation shaft is slidably held in the axial direction in the housing, and the housing is provided with a detection switch and a return spring that operate in accordance with the sliding movement of the operation shaft. Accordingly, when the detection switch is operated and the first pressing force is applied to the operation shaft, the projecting piece abuts the opening of the shaft hole and functions as a stopper, so that the operation shaft is operated by the urging force of the return spring. When an excessive second pressing force is applied to the operating shaft, the projecting piece collides with the opening of the shaft hole and is destroyed, and the broken portion bites into the shaft hole. In normal operation, the projecting piece functions as a stopper, so that no excessive pressing force is applied to the detection switch, and damage to the detection switch can be prevented. Excessive pressure is applied. Was the case, cut into the shaft hole by breaking the protruding portions of the operating shaft, so preventing the return of the operating shaft, it is possible to provide a rotary electric component corresponding to the inner 突規 system with a simple structure.

In addition, the operating shaft is formed with a different shaft diameter across the projecting piece so that the shaft diameter located outside the projecting piece is smaller than the shaft diameter inserted through the shaft hole. When an excessive pressing force is applied to the operating shaft, the projecting piece is pushed down toward the outside, which has a small shaft diameter. Can be bitten.
In addition, since both the operation shaft and the bearing are made of a metal material, the variation in the pressing force leading to the breakage is unlikely to occur, and the function of the protruding piece portion can be obtained over a long period of time.
In addition, since the projecting piece is formed in a disk-like bowl shape, the structure is simplified and workability is improved.

  Embodiments of the rotary operation type electric component of the present invention are shown in FIGS. 1 is a front view of a rotary operation type electrical component of the present invention, FIG. 2 is a side view of the rotary operation type rotary component, FIG. 3 is a cross-sectional view of the rotary operation type electrical component, and FIG. FIG. 5 and FIG. 6 are explanatory views showing the operation in a state in which the rotary operation type electric component is arranged on the panel of the electronic device.

  In the figure, the housing 1 is formed in a box shape having one end opened with an insulating material such as synthetic resin, and has a storage portion 1a inside. The storage portion 1a includes a central fixed contact 2 and a peripheral fixed contact 3 which are fixed contact portions for a push detection switch made of a conductive metal plate exposed on the inner bottom surface, and the same conductive metal rising from the inner bottom surface. Brush-like sliders (not shown) that are fixed contact portions for rotation detection switches made of plates are provided.

  In addition, a plurality of connection terminals 4 led out from the contact portion for the push detection switch and the contact portion for the rotation detection switch protrude from the opposing side surface portions of the housing 1 and then vertically to the bottom surface side. It is bent and formed. This connection terminal 4 is soldered and attached to a conductive pattern of a circuit board (not shown) such as an electronic device.

  A leaf spring-like contact piece 5 made of a thin metal plate is placed on the peripheral fixed contact 3 of the storage portion 1a so as to face the central fixed contact 2, and the contact piece. Above 5, there is provided a return spring 6 made of a flexible rubber material having a pressing portion 6 a that presses the contact piece 5 to conduct between the central fixed contact 2 and the peripheral fixed contact 3. ing. The return spring 6 has a dome portion 6b that can be reversed, and after being reversed by a pressing operation of the operation shaft 10 to be described later, the operation shaft 10 is returned to the initial position by its own reverse restoring force. Yes.

  A rotating plate 7 made of an insulating material such as synthetic resin is rotatably stored in the storage portion 1a. The rotating plate 7 includes a disc-shaped code plate portion 7a and a cylindrical portion 7b protruding from the code plate portion 7a into a hollow cylindrical shape. Further, a contact portion having a comb tooth shape made of a conductive metal plate is formed in an annular shape on one end side of the code plate portion 7a, and the contact portion is a brush-like slider. The movable contact 7c is in sliding contact with (not shown).

  An uneven cam portion (not shown) is formed on the other end side of the code plate portion 7a. When this cam portion is in sliding contact with a leaf spring 9 fixed to a bearing 8 described later, a click feeling when the rotating plate 7 is rotated is obtained.

  The bearing 8 is die-cast with a metal material such as zinc. The bearing 8 includes a base portion 8b having a rectangular shape having a recess 8a, and a protruding portion 8c formed to protrude from the base portion 8b. A plate spring 9 made of a metal plate having an elastic arm portion is fixed to the concave portion 8a of the base portion 8b, and the tip of the elastic arm portion of the plate spring 9 is connected to the code plate portion 7a of the rotary plate 7. It is in sliding contact with the cam portion on the other side.

  Further, the projecting portion 8c is formed with a slightly large-diameter hollow hole 8d and a slightly small-diameter shaft hole 8e formed at the distal end side of the hollow hole 8d. Further, the cylindrical portion 7b of the rotating plate 7 is rotatably inserted into the hollow hole 8d, and an operation shaft 10 described later is similarly rotatably inserted into the shaft hole 8e.

  The operation shaft 10 is made of a metal material such as aluminum, and is formed in a rod shape by a method such as cutting or die casting. The operation shaft 10 has a base shaft portion 10a inserted through the shaft hole 8e of the bearing 8, and an outer shaft portion 10b formed to protrude outward from the base shaft portion 10a. Further, a projecting piece 10c extending in a direction orthogonal to the axial direction of the operation shaft 10 is integrally formed between the base shaft portion 10a and the outer shaft portion 10b so as to face the opening portion of the shaft hole 8e. Is formed. Further, the projecting piece 10 c is formed in a disk-like bowl shape continuous around the operation shaft 10.

  Further, the operating shaft 10 is such that the shaft diameter of the outer shaft portion 10b located outside the protruding piece portion 10c is smaller than the shaft diameter of the base shaft portion 10a inserted through the shaft hole 8e. Further, each of the projecting piece portions 10c is formed so as to have different shaft diameters.

  The driving body 11 is made of an insulating material such as synthetic resin and is formed in a substantially cylindrical shape. The drive body 11 is engaged with the distal end side of the base shaft portion 10 a of the operation shaft 10, and is rotated and slid along with the operation shaft 10. The driving body 11 is inserted through the hollow portion of the cylindrical portion 7b of the rotating plate 7, and can be slid into the hollow portion of the cylindrical portion 7b when the operating shaft 10 is pushed. When the operation shaft 10 is rotated, a fitting portion (not shown) is spline-fitted with the rotating plate 7 so that the rotating shaft 7 is rotated.

  Further, the dome portion 6 b of the return spring 6, in which the distal end side (the opposite side engaged with the operation shaft 10) of the driving body 11 is disposed above the contact piece 5 of the housing portion 1 a of the housing 1. The return spring 6 is urged to the outside of the shaft hole 8 e of the bearing 8 together with the operating shaft 10 by the elastic force of the return spring 6. When the operating shaft 10 is pushed, the return spring 6 is pressed through the driving body 11, and the dome portion 6 b is reversed to press the contact piece 5.

  A spacer 12 made of an insulating material such as a synthetic resin and a mounting plate 13 made of a metal plate or the like are disposed on both sides of the housing 1 and the bearing 8, and claw pieces (not shown) of the mounting plate 13. ) Is locked to a locking portion (not shown) of the spacer 12 so that the casing 1 and the bearing 8 are overlapped and sandwiched.

  Next, the operation of the rotary operation type electrical component having the above configuration will be described with reference to FIGS. 4 to 6 show a state in which the rotary operation type electric parts are arranged on the panel of the electronic device. An operation knob 14 is attached to the outer shaft portion 10b of the operation shaft 10, and the operation knob 14 is attached to the panel. 15 is arranged so as to protrude from 15.

  First, as shown in FIG. 4, in an initial state where the operation knob 14 is not operated, the operation shaft 10 is urged outward by the elastic force of the return spring 6, and the fixed contact portion for the push detection switch is used. A certain center fixed contact 2 and the contact piece 5 are not in contact with each other and are separated from each other. Further, the fixed contact portion (not shown) for the rotation detection switch and the movable contact 7c are not slid, and the output is not changed.

  From this state, when the operation knob 14 is rotated, the rotating plate 7 is rotated via the driver 11, and the movable contact 7c formed on the rotating plate 7 and the fixed contact made of a brush-like slider. The part (not shown) is in sliding contact with the rotation detection switch and a detection signal is output. At this time, the cam portion (not shown) of the code plate portion 7a of the rotating plate 7 and the leaf spring 9 fixed to the base portion 8b of the bearing 8 are brought into sliding contact with a moderation, thereby causing a rotation operation. A click feeling can be obtained.

  Next, when the operation knob 14 is pushed with a normal third pressing force (a pressing force larger than the reversing force of the return spring 6 and a pressing load of about 4 Newtons or more), the operation knob 14 returns via the driving body 11. When the spring 6 is pressed, the dome portion 6 b of the return spring 6 is reversed and the pressing portion 6 a presses the contact piece 5, and the contact piece 5 comes into contact with the central fixed contact 2. Then, the central fixed contact 2 and the peripheral fixed contact 3 become conductive through the contact piece 5, and a detection signal of the push detection switch is output.

At this time, if the push operation to the operation knob 14 is a first pressing force (a pressing load of about 300 Newtons) larger than the third pressing force at which the push detection switch operates, the operation shaft 10 A projecting piece 10c formed between the base shaft portion 10a and the outer shaft portion 10b contacts the opening of the shaft hole 8e of the bearing 8 and functions as a stopper.
When the pressing force equal to or lower than the first pressing force on the operation knob 14 is released, the operation shaft 10 is returned to the initial state by the urging force of the return spring 6, and the push detection switch is turned off. .

  Also, as shown in FIG. 5, at this time, when a second pressing force (a pressing load of about 400 Newtons) that is an excessive push operation larger than the first pressing force is applied to the operation knob 14, The protruding piece 10c collides with the opening of the shaft hole 8e of the bearing 8, and the protruding piece 10c is broken and broken in the direction of the outer shaft 10b having a small diameter. The operating shaft 10 is locked at that position by biting into the shaft hole 8e.

  In this case, the fracture portion 10d of the projecting piece 10c formed on the operation shaft 10 is a fracture surface of a metal material, and the surface is rough due to burrs or the like. By biting into the shaft hole 8e, the operation shaft 10 is in a state where it cannot rotate and push (product destruction state).

  Further, in this case, the operating shaft 10 has a smaller diameter of the outer shaft portion 10b located outside the protruding piece portion 10c than the shaft diameter of the base shaft portion 10a inserted through the shaft hole 8e of the bearing 8e. The projecting piece 10c is formed so as to have different shaft diameters across the projecting piece 10c. When an excessive pressing force is applied to the operating shaft 10, the projecting piece 10c has a small diameter. Since it is pushed down toward the outside, the protruding piece 10c is easily broken, and the broken portion can be surely bitten into the shaft hole 8e.

  Further, the operation shaft 10 and the bearing 8 are both made of a metal material such as aluminum and zinc. Therefore, it is difficult for variations in the pressing force from colliding with each other to breaking. The function of the projecting piece 10c can be obtained over a long period of time. Further, since the projecting piece 10c is formed in a disc-like bowl shape, the structure is simple and the workability is improved.

  In this way, the breakable protrusion 10c is formed on the operation shaft 10, and when an excessive pushing load of about 400 Newton is applied to the operation knob 14, the protrusion 10c is broken and the operation shaft 10 By configuring so that 10 can not rotate and push (product destruction state), it is possible to comply with the collision regulations that become the safety standard of in-vehicle electrical equipment in Europe and the like .

FIG. 6 shows that when a second pressing force (a pressing load of about 400 Newtons) that causes an excessive push operation is applied to the operation knob 14, the projecting piece 10 c is formed in the shaft hole 8 e of the bearing 8. A state is shown in which the projecting piece 10c is broken and detached from the base shaft 10a by colliding with the opening.
Also in this case, similarly, the fracture portion 10d of the projecting piece 10c is a fracture surface of a metal material, and its surface is roughened by burrs or the like, so this fracture surface becomes the shaft hole 8e of the bearing 8. Therefore, the rotation and push operations of the operation shaft 10 are blocked (product destruction state).

  Although not shown in the figure, if an annular groove that is thin so as to be easily broken is formed in the base of the bowl-shaped protruding piece 10c that is formed in a disc shape, the rod is more easily broken and reliably A product destruction state can be obtained. Further, a plurality of projecting piece portions may be formed in an annular shape instead of the bowl-shaped projecting piece portion 10c. In this case, the same effect can be obtained.

  According to the embodiment of the present invention described above, the projecting piece portion that extends in the direction orthogonal to the axial direction is opposed to the opening portion of the shaft hole 8 e of the bearing 8 on the operation shaft 10 to which the operation knob 14 is mounted. 10 c is integrally formed, and this projecting piece 10 c functions as a stopper when a first pressing force (a pressing load of about 300 Newtons) is applied in the axial direction of the operating shaft 10. When a second pressing force (a pressing load of about 400 Newtons) greater than the first pressing force is applied in the direction, the projecting piece 10c collides with the opening of the shaft hole 8e and breaks. Since the breaking portion 10d bites into the shaft hole 8e to prevent the operation shaft 10 from rotating, when an excessive pressing force is applied to the operation shaft 10, the protruding piece portion of the operation shaft 10 is provided. 10c is destroyed, and this destroyed part 10d is eaten into the shaft hole 8e. In addition, since the operation shaft 10 is prevented from rotating, the operation body such as a knob attached to the operation shaft 10 does not need to have a complicated structure, and can be reduced in size and cost can be reduced. It is possible to provide a rotary operation type electrical component that complies with the internal collision regulation, which is a safety standard for equipment.

  In addition, the operation shaft 10 is slidably held in the housing 1 in the axial direction, and a detection switch (the contact piece 5 and the fixed member) is operated in the housing 1 a of the housing 1 as the operation shaft 10 is slid. In the case of the one provided with the contacts 2, 3) and the return spring 9, in the normal operation, the protruding piece 10c functions as a stopper. The switch can be prevented from being damaged, and when an excessive pressing force is applied, the projecting piece 10c of the operating shaft 10 breaks down and bites into the shaft hole 8e, thereby preventing the operating shaft 10 from returning. Thus, it is possible to provide a rotary operation type electric component corresponding to the internal collision regulation.

  In the above embodiment, the return spring is made of a rubber material having elasticity. However, the return spring may be a coil spring made of a metal material. In addition, as a configuration of the detection switch, a pair of fixed contacts and a reversible dome-shaped movable contact made of a rubber material formed with a conductive material such as carbon that conducts both fixed contacts can be used. The dome-shaped movable contact can also have a function of a return spring.

  In the above embodiment, the encoder having the code plate portion 7a is illustrated as an example of the rotary operation type electric component. However, the movable contact provided on the rotary plate or the fixed contact slidably contacting the movable contact is used as a resistor. You may apply this invention to the variable resistor used as the body.

It is a front view which shows the rotary operation type electric component of this invention. It is a side view which shows the rotary operation type rotary component of this invention. It is sectional drawing which shows the rotary operation type electric component of this invention. It is explanatory drawing which shows the state which has arrange | positioned the rotary operation type electrical component of this invention in the panel of the electronic device. It is explanatory drawing which shows operation | movement in the state which has arrange | positioned the rotary operation type electrical component of this invention in the panel of the electronic device. It is explanatory drawing which shows operation | movement in the state which has arrange | positioned the rotary operation type electrical component of this invention in the panel of an electronic device. It is the side view which made a part the cross section which shows the conventional rotary operation type electric component. It is explanatory drawing explaining operation | movement of the conventional rotary operation type electrical component.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Case 1a: Storage part 2: Center fixed contact 3: Peripheral fixed contact 4: Connection terminal 5: Contact piece 6: Return spring 6a: Pressing part 6b: Dome part 7: Rotating plate 7a: Code plate part 7b: Tube Part 7c: Movable contact 8: Bearing 8a: Recess 8b: Base part 8c: Projection part 8d: Hollow part 8e: Shaft hole 9: Leaf spring 10: Operation shaft 10a: Base shaft part 10b: Outer shaft part 10c: Projection piece part 10d: Destructive part 11: Driver 12: Spacer 13: Mounting plate 14: Operation knob 15: Panel

Claims (5)

  A housing having a housing portion, a bearing having a shaft hole and engaged with one end of the housing, and an operation shaft protruding outward from the shaft hole and rotatably held in the housing And a rotating plate that has a movable contact and is rotated in accordance with a rotation operation of the operation shaft, and a fixed contact that is disposed in the storage portion and is in sliding contact with the movable contact. A projecting piece that is opposed to the opening of the shaft hole and that extends in a direction orthogonal to the axial direction is formed integrally, and when the first pressing force is applied to the projecting piece in the axial direction of the operation shaft, When an excessive second pressing force larger than the first pressing force is applied in the axial direction of the operation shaft, the projecting piece collides with the opening of the shaft hole. The operation portion is prevented from being rotated by being broken and the destruction portion biting into the shaft hole. Rotary electric parts that.   The operation shaft is slidably held in the axial direction in the housing, and a detection switch and a return spring that operate in accordance with the slide movement of the operation shaft are provided in the housing portion of the housing, and the operation shaft When the detection switch is operated in accordance with the pressing operation, and when the first pressing force is applied to the operation shaft, the projecting piece portion contacts the opening of the shaft hole and functions as a stopper. The operating shaft can be returned by the urging force of the return spring. When an excessive second pressing force is applied to the operating shaft, the projecting piece collides with the opening of the shaft hole. 2. The rotary operation type electric component according to claim 1, wherein the operation portion is prevented from returning by being broken and the breakage portion biting into the shaft hole.   The operation shaft is formed with a different shaft diameter across the projecting piece portion so that the shaft diameter located outside the projecting piece portion is smaller than the shaft diameter inserted through the shaft hole. The rotary operation type electrical component according to claim 1 or 2, wherein   4. The rotary operation type electric component according to claim 1, wherein both the operation shaft and the bearing are made of a metal material. The rotary operation type electric component according to any one of claims 1 to 4, wherein the projecting piece is formed in a disk-like bowl shape.

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