JP2005302583A - Mounting structure of operation knob for switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of an operation knob for a switch capable of improving operability, on which, an operation knob can be surely mounted without slanting. <P>SOLUTION: A vehicular measuring instrument has a dial 20, a circuit board 30 arranged on the back face of the dial 20, and a casing 10 holding the dial 20 and the circuit board 30. The mounting structure of the operation knob 80, mounted by penetrating through a penetration hole 20g formed on the dial 20, is arranged in order to hold the operation knob 80 operating the switch 32 mounted on the circuit board 30 from front side of the dial 20 by the casing 10. A light guide plate 40, on which, U-shaped notched part (penetration part) 40A1 is formed, having a thickness several times as thick as the thickness of the dial, is arranged between the dial 20 and the circuit board 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mounting structure for a switch operating knob.

  As a conventional switch operating knob mounting structure, there is one implemented in a reset switch portion of a trip meter of a vehicle meter (Patent Document 1).

  FIG. 5 is a cross-sectional view showing the mounting structure of the switch operation knob described above. In FIG. 5, the vehicle meter includes a resin casing 10, a dial plate 20, a circuit board 30, a light guide plate 40, and a front panel 50 assembled to the casing 10. A trip meter reset switch 32 is mounted on the circuit board 30. As an operation force transmission member that transmits an operator's operation force to the reset switch 32, a cylindrical resin operation knob 80 and an elastic member 81 are provided. Through holes 10g, 20g, and 50g are formed in the casing 10, dial 20 and front panel 50 immediately above the reset switch 32, respectively. The elastic member 81 is disposed in the through hole 10g, and the operation knob 80 is disposed in the through holes 20g and 50g.

The operation knob 80 is configured to maintain rigidity with respect to the operation force, and is moved in the direction of the arrow A to transmit the operation force of the operator to the reset switch 32 via the elastic member 81. Further, the operation knob 80 is formed with a protruding portion 80a protruding on the outer periphery thereof. The protrusion 80 a prevents the tip of the operation knob 80 from coming out of the through hole 20 g of the dial 20.
JP 2001-298287 A

However, the above-described mounting structure has the following problems.
(1) Since the dial 20 is fixed by a thin plate such as the dial 20, the operation knob 80 may come off when the dial 20 is distorted.
(2) If the distance between the front panel 50 and the dial 20 is short, the knob may tilt. Even when the vehicle instrument is assembled, the assembling property of the front panel 50 may deteriorate due to the tilt of the operation knob 80.
(3) The interference between the operation knob 80 and the dial plate 20 may cause the dial plate 20 to float or shift, and the operability of the operation knob 80 may deteriorate.

  Therefore, in view of the above-described conventional problems, an object of the present invention is to provide a switch operating knob mounting structure that can securely mount an operating knob without tilting and can improve operability. .

  According to a first aspect of the present invention, there is provided a vehicular instrument having a dial, a circuit board disposed in a reverse direction of the dial, and a casing that holds the dial and the circuit board. The instrument is mounted on the circuit board. An operation knob mounting structure for holding an operation knob for operating the switch from the front side of the dial plate and holding the operation knob through the through-hole formed in the dial plate. A light guide plate having a thickness of at least several times the thickness of the dial plate and having a through portion formed between the plate and the circuit board is disposed, and the operation knob is inserted through the through portion of the light guide plate. It is characterized by supporting the above.

  The invention according to claim 2 is the mounting structure of the operation knob according to claim 1, wherein the light guide plate is formed with a U-shaped notch serving as the penetrating portion, and an arc that forms the U-shaped notch The diameter of the part is set to be larger than the diameter of the operation knob and smaller than or equal to the diameter of the through hole of the dial.

  According to a third aspect of the present invention, in the operation knob mounting structure according to the second aspect, the casing is formed with an operation knob accommodating portion that accommodates the operation knob. The operation knob includes a main body portion and the main body. An operation portion having a substantially cylindrical shape extending from the first portion to one side and passing through the through hole of the dial plate and the through portion of the light guide plate, and a pressing portion extending from the main body portion to the other and pressing the switch. The main body portion is further provided with an elastic locking portion extending to the other side, and a locking claw is formed at the tip of the elastic locking portion, and the main body portion is an operation knob of the casing. It is accommodated in the accommodating part, The said latching claw is latched by the end surface of the said operation knob accommodating part, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, in the mounting structure of the operation knob according to any one of the first to third aspects, the switch is a trip meter reset switch.

  According to the first aspect of the present invention, by using a part of the light guide plate for mounting the operation knob, the operation knob can be supported so as not to tilt, and the operability and assembly workability of the operation knob can be improved. improves.

  According to the second aspect of the invention, since the operation knob is supported by the U-shaped cutout portion of the light guide plate, the operation knob can be securely attached without being inclined. Moreover, since the U-shaped notch is formed larger than the diameter of the operation knob, it does not affect the vertical movement of the operation knob.

  According to the third aspect of the present invention, the operation knob can be supported so as not to tilt, and the operability and assembly workability of the operation knob are improved, and the operation knob is prevented from being detached.

  According to invention of Claim 4, the operativity of the reset switch of a trip meter can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, as in the conventional example shown in FIG. 5, a case where the reset switch portion of the trip meter of the vehicle instrument is implemented will be described. Further, the same components as those in FIG.

  1 is an exploded perspective view showing an embodiment of a switch operating knob mounting structure according to the present invention, FIG. 2 is a partially enlarged perspective view in FIG. 1, and FIG. 3 is a sectional view taken along line XX in FIG. 4 is a cross-sectional view taken along line YY in FIG. In each figure, some components are omitted for the sake of simplicity.

  The vehicle meter includes a synthetic resin casing 10, a dial plate 20, a circuit board 30, a light guide plate 40, and a front panel 50 assembled to the casing 10.

  A trip meter reset switch 32 is mounted on the circuit board 30. The reset switch 32 is a push-type switch. Further, the circuit board 30 is formed with a through hole 30g for releasing a locking claw 80D1 of the operation knob 80 described later.

  As an operation force transmission member that transmits an operator's operation force to the reset switch 32, a synthetic resin operation knob 80 having a cylindrical portion is provided. The operation knob 80 has a substantially box-shaped main body portion 80A, an integrally formed substantially cylindrical operation portion 80B extending upward from substantially the center of the upper surface of the main body portion 80A, and substantially from the center of the lower surface of the main body portion 80A. It has a substantially cylindrical pressing portion 80C integrally formed so as to extend downward. The main body portion 80A is provided with an elastic locking portion 80D integrally formed so as to extend downward from the two opposite corners. A locking claw 80D1 is formed at the tip of the elastic locking portion 80D.

  An operation knob housing portion 10 a is formed in the casing 10 immediately above the reset switch 32. The operation knob accommodating portion 10a has openings in the upper and lower sides and is formed in a room shape that can accommodate the substantially box-shaped main body portion 80A of the operation knob 80. The operation knob accommodating portion 10a is positioned so that the reset switch 32 mounted on the circuit board 30 fixed to the casing 10 with screws or the like is accommodated in the lower part thereof.

  The dial 20 and the front panel 50 are formed with through holes 20g and 50g, respectively. The through holes 20g and 50g are formed in a circular shape having a diameter larger than the diameter of the operation portion 80B of the operation knob 80.

  The arc-shaped light guide plate 40 has a thickness that is at least several times the thickness of the dial plate 20, and an operation knob pressing portion 40 </ b> A that is integrally formed so as to protrude from one end thereof. A character-shaped notch 40A1 is formed. The diameter of the arc portion forming the U-shaped notch 40A1 is set to be larger than the diameter of the operation portion 80B of the operation knob 80 and equal to or smaller than the diameter of the through hole 20g of the dial plate 20.

  And the operation part 80B of the operation knob 80 is arrange | positioned so that the through-hole 20g of the dial plate 20, the U-shaped notch 40A1 of the light-guide plate 40, and 50g of the front panel 50 may each be penetrated.

  Next, a method for assembling the operation knob 80 will be described. At the time of assembly, the elastic locking portion 80D of the operation knob 80 is inserted from above into the operation knob accommodating portion 10a of the casing 10 to which the circuit board 30 is fixed with screws or the like, and the main body portion 80A is accommodated in the operation knob accommodating portion 10a. To do. At this time, the locking claw 80D1 of the elastic locking portion 80D moves downward while hitting the inner wall of the operation knob housing portion 10a, and is finally locked to the end surface of the lower opening of the operation knob housing portion 10a. At the time of locking, the locking claw 80D1 enters the through hole 30g of the circuit board 30. When the locking is completed, the pressing portion 80C of the operation knob 80 is positioned immediately above the reset switch 32.

  Next, the light guide plate 40 is fitted into the recess 10 b of the casing 10. At the time of this fitting, the U-shaped notch 40A1 of the operation knob pressing portion 40A is fitted into the operation portion 80B of the operation knob 80.

  Next, the dial plate 20 is placed on the light guide plate 40 while the operation portion 80b of the operation knob 80 is passed through the through hole 20g. Next, the front panel 50 is fixed to the casing 10 while the operation portion 80b of the operation knob 80 is passed through the through hole 50g. In this way, the assembly of the operation knob 80 is completed.

  When the operation knob 80 is pushed down by the operator's operation force after the assembly is completed, the pressing portion 80C hits the reset switch 32, the operation force is transmitted, and the reset switch 32 is activated.

  As described above, when the operation knob 80 is assembled, the main body 80A is accommodated in the operation knob accommodating portion 10a, and the locking claw 80D1 is engaged with the end surface of the lower opening of the operation knob accommodating portion 10a. U-shaped notch portion of the operation knob pressing portion 40A of the light guide plate 40 having an arc portion that is larger than the diameter of the operation portion 80B of 80 and set to be equal to or smaller than the diameter of the through hole 20g of the dial plate 20 Since the operation unit 80B is supported by 40A1, the operation knob 80 can be securely attached without being inclined.

  Further, since the U-shaped notch 40A1 is formed larger than the diameter of the operation portion 80B of the operation knob 80, it does not affect the vertical movement of the operation knob 80. Further, when the upper surface of the main body portion 80A of the operation knob 80 comes into contact with the back surface of the operation knob pressing portion 40A, there is an effect of preventing the removal after the operation knob is assembled.

  As described above, by using a part of the light guide plate 40 for attaching the operation knob 80, the operation knob 80 can be fixed at the same time as fixing the light guide plate 40, and the assembling workability is improved. In addition, the operation knob 80 is prevented from coming off and tilt is prevented.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to this, and various modifications and applications are possible.

  For example, in the above-described embodiment, the operation knob holding portion 40A of the light guide plate 40 is formed with the U-shaped cutout portion 40A1 as the penetrating portion, but the operation knob 80 is replaced with the U-shaped cutout portion 40A1. A through hole having a diameter larger than the diameter of the operation portion 80B and having a diameter equal to or smaller than the diameter of the through hole 20g of the dial plate 20 may be formed as the through portion.

It is a disassembled perspective view which shows embodiment of the attachment structure of the operation knob for switches concerning this invention. It is a partial expansion perspective view in FIG. It is the XX sectional view taken on the line in FIG. It is the YY sectional view taken on the line in FIG. It is sectional drawing which shows the attachment structure of the conventional switch operation knob.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Casing 10a Operation knob accommodating part 20 Dial 20g Through-hole 30 Circuit board 32 Reset switch (switch)
40 Light guide plate 40A1 U-shaped notch (penetrating part)
50 Front Panel 80 Operation Knob 80A Body 80B Operation 80C Press 80D Elastic Locking 80D1 Locking Claw

Claims (4)

In a vehicular instrument having a dial, a circuit board disposed in a reverse direction of the dial, and a casing for holding the dial and the circuit board, a switch mounted on the circuit board is connected to the dial. An operation knob mounting structure for mounting an operation knob operated from the front direction through the through-hole formed in the dial while being held by the casing,
A light guide plate having a thickness at least several times the thickness of the dial plate and having a through portion formed between the dial plate and the circuit board is disposed, penetrating the through portion of the light guide plate, and An operation knob mounting structure characterized by supporting the operation knob. The operation knob mounting structure according to claim 1,
The light guide plate is formed with a U-shaped notch serving as the penetrating portion, and the diameter of the arc portion forming the U-shaped notched portion is larger than the diameter of the operation knob and the through-hole of the dial plate. An operating knob mounting structure characterized by being set to be equal to or smaller than the diameter. In the operation knob mounting structure according to claim 2,
The casing is formed with an operation knob accommodating portion for accommodating the operation knob,
The operation knob extends from the main body part to the other from the main body part, and extends from the main body part to the other through the substantially cylindrical operation part penetrating the through hole of the dial plate and the through part of the light guide plate. A pressing portion for pressing the switch,
The main body part is further provided with an elastic locking part extending to the other side,
A locking claw is formed at the tip of the elastic locking portion,
The main body is accommodated in the operation knob accommodating portion of the casing,
The operation knob mounting structure, wherein the locking claw is locked to an end surface of the operation knob housing portion. In the operation knob mounting structure according to any one of claims 1 to 3,
The switch is a trip meter reset switch. An operation knob mounting structure, wherein:

Images