JP2006040579A - Shakiness prevention structure of push knob - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shakiness prevention structure of a push knob fitted to an equipment with the push knob, with problems caused by position shift of a push switch against a substrate solved. <P>SOLUTION: In the structure fitted to an equipment 1 provided with a base 7, the push switch 4 having a shaft 5 loaded on the substrate 3 fixed to the base 7 and sliding in an axis direction, and the push knob 6 insertion-coupled with the shaft 5 of the push switch 4, the shaft 5 slides by pressing operation of the push knob 6 in an axis direction of the shaft 5 for the push switch 4 to generate signals, and prevents the push knob 6 from shaking toward a radius direction of the shaft 5 at the pressing operation. A guide part 9 regulating the push knob 6 in the radius direction of the shaft 5, and at the same time, guiding in the pressing direction is coupled with the shaft 5 in free movement in the radius direction of the shaft 5 through a coupling plate part 12 made of an elastic material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure for preventing rattling of a push knob provided in a device having a push knob.

  Patent Document 1 describes a push knob that is attached to a device such as a car audio. FIG. 6 is a cross-sectional view illustrating an example of a pressing operation unit provided in a device apparatus such as a car audio.

  In FIG. 6, reference numeral 101 denotes a base of the device apparatus, and the substrate 102 is fixed. A push switch 103 is mounted on the substrate 102, and a cylindrical push knob 105 is fitted to the shaft 104 thereof. By pressing the push knob 105, the shaft 104 slides in the axial direction, and the push switch 103 generates a signal. When the pressing force to the push knob 105 is released, the shaft 104 slides upward by the spring inside the push switch 103 and returns to the position before the pressing.

Reference numeral 106 denotes a guide portion that prevents the push knob 105 from rattling in the radial direction during a pressing operation, and is fixed to the base 101. The guide portion 106 is formed in a bottomed cylindrical shape, and a cylindrical portion 107 protruding upward is formed in the center portion of the bottom wall. A cylindrical fitting portion 108 that fits into the serration of the shaft 104 is coaxially formed inside the push knob 105, and the fitting portion 108 slides coaxially and axially with the cylindrical portion 107. It is freely housed. The push knob 105 is regulated in the radial direction by the cylindrical portion 107 and guided in the pressing direction.
JP-A-9-115389

  When the push switch 103 is attached to the substrate 102, the position of the push switch 103 may be displaced. In this case, the shaft 104 is eccentric with respect to the cylindrical portion 107. As a result, the outer peripheral portion of the fitting portion 108 is locally strongly pressed against the cylindrical portion 107 and the frictional force is increased, the force during the pressing operation is increased, the operation feeling is lowered, or the push switch is pushed in. There may be a problem that 103 does not return to the original position.

  Note that when a jig is used to improve the positioning accuracy of the push switch 103 with respect to the substrate 102, there are problems that the cost increases and the productivity decreases.

  It is an object of the present invention to provide a structure for preventing rattling of a push knob provided in a device, which eliminates problems caused by displacement of the push switch with respect to the substrate and prevents damage during assembly. There is to do.

  In order to achieve the above object, the invention described in claim 1 is a base, a push switch having a shaft mounted on a substrate fixed to the base and sliding in an axial direction, and the shaft of the push switch. Provided in a device that is configured such that the push switch generates a signal by sliding the shaft by pressing the push knob in the axial direction of the shaft. A structure for preventing the shaft from rattling in the radial direction due to the pressing operation of the push knob, wherein the push knob is regulated in the radial direction of the shaft and guided in the axial direction of the shaft. The portions are connected to each other so as to be movable in the radial direction of the shaft via a connecting plate portion made of an elastic material.

  The invention according to claim 2 is the push knob rattling prevention structure according to claim 1, wherein the connecting plate portion is disposed with a space along the circumferential direction of the guide portion. It is characterized by.

  The invention according to claim 3 is the push knob rattling prevention structure according to claim 1 or 2, wherein the connecting plate portion connects the guide portion and the base by two-color molding. It is characterized by being integrally molded.

  According to the first aspect of the present invention, when the push switch is displaced with respect to the substrate, the guide portion moves when the push knob is fitted to the shaft, and the eccentricity between the guide portion and the shaft is automatically performed. Therefore, it is possible to prevent the pressing operation force of the push knob from increasing or the pushed push knob from being restored.

  According to the first aspect of the present invention, since the connecting plate portion made of an elastic material connects the guide portion and the base, freedom of movement in the left and right and up and down directions is given to the guide portion. Thereby, the eccentricity between the guide portion and the shaft can be reliably corrected. Furthermore, even when the positional deviation when assembling the push knob is large, the connecting plate portion is elastically deformed and absorbed, so that the assembling can be performed smoothly.

  According to the second aspect of the present invention, since a plurality of connecting plate portions are arranged in the circumferential direction, a degree of freedom in all radial directions is given to the guide portion. For this reason, it is possible to correct the eccentricity between the guide portion and the shaft in all directions.

  According to invention of Claim 3, since it shape | molds by 2 color shaping | molding, a number of parts and an assembly man-hour reduce, and a manufacturing cost reduces.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an apparatus apparatus having a push knob rattling prevention structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the connecting plate portion, and FIG. 5 is a plan view of the cylindrical portion of the guide portion.

  A device apparatus 1 shown in FIG. 1 is a car audio operation unit disposed on, for example, an instrument panel in a vehicle compartment, and includes a plurality of pressing / rotation operation units 2. One pressing / rotating operation unit 2 is for turning the power ON / OFF and adjusting the volume. When the pressing operation is performed, the power is turned ON / OFF, and the volume is changed by rotating the power. Yes. The other pressing / rotating operation unit 2 is for selecting a tuner channel and adjusting the frequency. The channel is selected by pressing, and the frequency is changed by rotating.

  As shown in FIG. 2, the pressing / rotating operation unit 2 includes a push switch 4 mounted on the substrate 3 and a push knob 6 fitted to the tip of the shaft 5. The substrate 3 is fixed to a base 7 that is a chassis of the device apparatus 1. The base 7 is made of synthetic resin, and components other than the substrate 3 are also attached.

  The push knob 6 has a cylindrical shape with a top, and a cylindrical fitting portion 8 that is fitted to the shaft 5 is formed coaxially with the shaft 5. When the push knob 6 is pressed, the shaft 5 slides in the axial direction and the push switch 4 generates a signal. When the pressing force to the push knob 6 is released, the shaft 5 slides in the protruding direction by the spring inside the push switch 4 and returns to the position before the pressing. Further, when the push knob 6 is rotated, the shaft 5 rotates around the axis, and the push switch 4 generates a signal.

  Reference numeral 9 denotes a guide portion that prevents rattling in the radial direction of the shaft 5 when the push knob 6 is pressed, and is connected to the base 7 via a connecting plate portion 12. The guide portion 9 includes a disk-shaped bottom wall 10 and a cylindrical portion 11 that coaxially surrounds the shaft 5 of the push switch 4 by projecting upward from the central portion thereof.

  A peripheral edge portion of the bottom wall 10 of the guide portion 9 is connected to the base 7 by a plurality of connecting plate portions 12.

  The cylindrical portion 11 accommodates the fitting portion 8 of the push knob 6 so as to be coaxial and slidable in the axial direction. A protrusion 13 protruding radially inward is formed at the tip of the cylindrical portion 11, and this protrusion 13 is in contact with the outer peripheral portion of the fitting portion 8. The push knob 6 is regulated in the radial direction by the cylindrical portion 11 and guided in the pressing direction and the rotation direction. A switch pressing portion 11 a is formed on the inner peripheral portion of the cylindrical portion 11, and presses the main body portion of the push switch 4 so as not to float from the substrate 3.

  In this case, the protrusions 13 are provided so as to be in linear contact with the outer peripheral portion of the fitting portion 8 over the entire circumference (see FIG. 5A), or contact with the outer peripheral portion of the fitting portion 8 at a plurality of points. If provided in such a manner (see FIG. 5B), the operation resistance when the push knob 6 is slid is reduced, and a good operational feeling can be obtained.

  The connecting plate portion 12 connects the bottom wall 10 of the guide portion 9 to the base 7 at a plurality of locations along the circumferential direction. In this embodiment, as shown in FIG. 3, the connecting plate portion 12 is arranged at three positions in the circumferential direction at equal intervals with respect to the disc-shaped bottom wall 10, so that the bottom wall 10 becomes the base 7. It is connected.

  The connecting plate portion 12 is formed of an elastic material. When the guide portion 9 and the base 7 are formed of ABS resin or the like, an elastomer material is used as the connecting plate portion 12. Thus, by forming the connecting plate part 12 with an elastic material, the connecting plate part 12 can be easily elastically deformed or bent. Thereby, the freedom degree of the movement to the left and right and up and down can be provided with respect to the guide part 9. FIG.

  The connecting plate portion 12 preferably has a shape that can be easily elastically deformed and bent. For example, a U-shaped cross-sectional shape shown in FIG. 4A or a continuous wave shape shown in FIG. The cross-sectional shape may be a zigzag cross-sectional shape or other shapes. Further, the connecting plate portion 12 can be formed integrally with the guide portion 9 and the base 7 by performing two-color molding, thereby reducing the number of parts and the number of assembly steps, thereby reducing the manufacturing cost.

  The base 7 is provided with a top cylindrical illumination member 14 that concentrically surrounds the push knob 6. The illumination member 14 is made of a light-transmitting synthetic resin, and transmits light from the light source 15 mounted on the substrate 3 so as to function as an illumination during night use.

  When the push knob 6 is pressed, the fitting portion 8 of the push knob 6 is guided by the cylindrical portion 11 of the guide portion 9 and slides in the axial direction, and the shaft 5 is pushed in the axial direction to generate a signal. When the hand that pushes the push knob 6 is released, the shaft 5 slides in the protruding direction by the spring inside the push switch 4, and the push knob 6 returns to the position before pressing.

  When the guide switch 9 is fixed to the base 7 when the position of the push switch 4 with respect to the substrate 3 is shifted, the shaft 5 is eccentric with respect to the cylindrical portion 11, so that the fitting portion 8 and the cylindrical portion are As a result, the frictional force between the push knob 6 and the push knob 6 is increased, or the pushed push knob 6 does not return.

  On the other hand, in this embodiment, since the guide portion 9 is connected to the base 7 so as to be movable in the radial direction of the shaft 5 via the connecting plate portion 12, the push switch 4 is displaced with respect to the substrate 3. As a result, when the push knob 6 is fitted to the shaft 5 at the time of manufacture, the guide portion 9 moves and the eccentricity between the cylindrical portion 11 and the shaft 5 can be automatically corrected. Thereby, the above problems do not occur.

  That is, when the shaft 5 and the cylindrical portion 11 are eccentric, when the fitting portion 8 of the push knob 6 is fitted to the shaft 5, the outer peripheral surface of the fitting portion 8 and the protrusion 13 of the cylindrical portion 11 Although the frictional force generated between the cylindrical part 11 and the shaft 5 becomes non-uniform in the circumferential direction, the guide part 9 moves in a direction to eliminate the non-uniformity of the frictional force and the cylindrical part 11 and the shaft 5 become concentric.

  In this embodiment, the push switch 4 also serves as a rotation switch, and the cylindrical portion 11 of the guide portion 9 also serves as a member that guides the push knob 6 in the rotation direction. Therefore, even if the push switch 4 is displaced with respect to the substrate 3 and the cylindrical portion 11 and the shaft 5 are eccentric, the eccentricity between the cylindrical portion 11 and the shaft 5 is automatically eliminated when the push knob 6 is attached. Therefore, the frictional force between the push knob 6 and the cylindrical portion 11 does not increase and the operation feeling does not decrease.

  Since the connecting plate portion 12 connects the bottom wall 10 of the guide portion 9 to the base 7 in three locations in the circumferential direction, the guide portion 9 is given freedom of movement in the left and right and up and down directions. And the eccentricity of the shaft 5 can be reliably corrected. In addition to this, even when the positional deviation when assembling the push knob 6 is large, the connecting plate portion 12 is elastically deformed and absorbs it, so that the assembly can be performed smoothly.

  When a plurality of pressing / rotating operation units 2 are provided and the guide unit 9 is fixed to the base, the amount of displacement of each push switch 4 is accumulated and added to the pitch between the push switches 4. As a result, the difference between the pitch between the guide portions 9 and the pitch between the push switches 4 becomes large, and the above-described problem is particularly likely to occur. By adopting the structure of this embodiment for any of the pressing / rotating operation parts, the pitch between the guide parts 9 and the pitch between the push switches 4 coincide with each other, thereby preventing the occurrence of the above problems. Can do.

  The present invention is also applicable when the push switch does not have the function of a rotary switch. In addition, the guide plate 9 and the base 7 may be formed separately from the guide plate 9 and the base 7 without forming the connecting plate 12 in two colors, and the guide 9 and the base 7 may be connected by a fastening member such as adhesion, fusion, or screws. Is possible. In addition, various modifications can be made to the above embodiment without departing from the gist of the present invention.

It is a front view of the apparatus apparatus provided with the rattling prevention structure of the push knob which is one Embodiment of this invention. It is the sectional view on the AA line of FIG. It is a bottom view of the guide part for showing arrangement of a connecting plate part. (A) And (b) is sectional drawing of a connection board part. (A) And (b) is a top view of the cylindrical part of a guide part. It is principal part sectional drawing of the apparatus provided with the rattling prevention structure of the conventional push knob.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus apparatus 3 Board | substrate 4 Push switch 5 Shaft 6 Push knob 7 Base 9 Guide part 10 Bottom wall 11 Cylindrical part 12 Connection board part

Claims (3)

A push switch (4) having a base (7), a shaft (5) mounted on a substrate (3) fixed to the base (7) and sliding in an axial direction; and the push switch (4) A push knob (6) fitted to the shaft (5), and the shaft (5) is slid by pressing the push knob (6) in the axial direction of the shaft (5). The push switch (4) is provided in the device (1) configured to generate a signal, and the shaft (5) is rattled in the radial direction by pressing the push knob (6). A structure for preventing
A guide portion (9) for restricting the push knob (6) in the radial direction of the shaft (5) and guiding it in the axial direction of the shaft (5) is connected via the connecting plate portion (12) made of an elastic material. A structure for preventing rattling of the push knob, wherein the structure is connected so as to be movable in the radial direction of the shaft (5).   2. The push knob rattling prevention structure according to claim 1, wherein the connecting plate portion is disposed with a space along a circumferential direction of the guide portion. The push according to claim 1 or 2, wherein the connecting plate portion (12) is integrally formed so as to connect the guide portion (9) and the base (7) by two-color molding. Prevents rattling of the knob.

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