JPH0128409Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pointer attachment device for a meter such as a speedometer or a tachometer for a car, in which a pointer separately arranged on the front face of a dial is detachably attached.

Conventional devices are shown in FIGS. 1 to 6. In the figure, a dial plate 3 is fixed to the upper part of the machine body 1 by screws 2, and a pointer shaft 4 extends from the machine body 1 through a central hole 2a bored in the dial plate 3, and is attached to the tip of the pointer shaft 4. A pointer stand 5 is non-rotatably crowned, and a pointer 6 is detachably fitted onto the pointer stand 5.

To explain in detail the connection structure between the pointer stand 5 and the pointer 6, the pointer stand 5 has a hole 5a into which the pointer shaft 4 is press-fitted, and a hole 5a formed on the outer periphery, as shown in FIGS. 4, 5, and 6. It has a stepped portion 5b, engaging protrusions 5c formed on both sides of the stepped portion 5b, and a rectangular recess 5d provided on the top surface, and the pointer 6 has a central portion as shown in FIGS. 2 and 3. A pair of claws 6b are provided on the bottom surface of the cap portion 6a.
and a square projection 6c between the claw 6b, and the claw 6b engages the engagement projection 5 with the stepped portion 5b of the pointer base 5.
The pointer 6 is removably and non-rotatably connected to the pointer stand 5 by fitting between the points 6 and 6c and by fitting the square projection 6c into the recess 5d.

However, in the above structure, the hook for fitting is molded with resin integrally with the pointer, and because it is not possible to make holes in the pointer due to design issues, the mold is placed in the direction of the bottom surface of the pointer at the time of production. In this case, the nail may be forcibly bent or the tip may be damaged. This has the drawback that the strength of the fit between the pawl and the stepped portion becomes unstable, resulting in a decrease in the reliability of pointer attachment. Furthermore, since both the mating claws and the stepped portions are resin parts, reliability against thermal environments is also low.

Furthermore, since the shape of the pointer stand is complicated and large, the diameter of the central hole of the dial plate becomes large, which also has the disadvantage that light easily leaks through this hole.

The present invention has been made in view of the above points, and aims to provide a removable pointer attachment device with improved attachment reliability.

Embodiments of the present invention will be described below based on the drawings.

7 to 13 show an embodiment of the present invention, and as shown in FIGS. 7, 8, and 9, the instruments include a speedometer 10 and a tachometer 11 for automobiles,
It has a common dial 12, and the pointer shaft 1 is driven by drive parts 13 and 14 fixed behind the dial 12, respectively.
5 and 15 are extended, and pointers 16 and 16 are detachably attached to the tip of the pointer shaft 15.

FIG. 10 shows the structure of the tip of the pointer shaft 15. A bullet-shaped pointer hakama 17 is fixed to the tip of the pointer shaft 15, and passes through the central hole 12a of the dial 12. The guideline hakama 17 has a ring-shaped groove 17a on the outer periphery.
and a flange portion 17b, and the flange portion 17b has a non-circular shape with a flat surface 17c obtained by cutting out a portion of a disk shape. Note that the edge of the groove 17a on the tip end side of the pointer hakama 17 is rounded.

FIG. 11 shows a pointer 16 that fits into the above-mentioned pointer hakama 17.
The bottom surface of the cap portion 16a of the pointer 16 has a hole 18 in the center and a non-circular recess 19 formed at the opening of the hole 18, as shown in the figure. As shown in the sectional view taken along the line A-A in FIG. 12, by inserting the guideline hakama 17 into this hole 18,
The engagement pin 20 fits into the groove 17a, and the circular pin collar 17b engages with the circular pin recess 19, so that the pointer 16 and pointer shaft 15 are integrated.

FIG. 13 is an exploded perspective view of the pointer cap portion 16a shown in FIG. It has a hole 18 into which the guide hakama 17 is inserted, a non-circular recess 19 formed at the opening of the hole 18, and a boss insertion hole 22 formed at the side. Also cap 2
1 is in the shape of a gutter, and a receiving part 21a for the tip of the guideline hakama 17 is provided at the center of the bottom surface, and 4 parts are provided around the receiving part 21a.
A book boss 21b is provided upright, and both ends of the receiving part 21a are sandwiched and supported by the four bosses 21b, and the axial movement is restricted by the inner wall surface of the cap 21. A pin 20 is provided.

The pointer main body 16b and the cap 21 are irremovably integrated by the two longer bosses 21b of the four bosses 21b penetrating the boss insertion hole 22 and welding their tips. .

When the pointer body 16b and the cap 21 are integrated, the portion around the hole 18 of the pointer body 16 comes into contact with the outer periphery of the engagement pin 20, so that the engagement pin 20 is attached to the receiving portion 21a of the cap 21. Top surface and hole 18
The support state of the boss 21b is maintained by the boss 21b. In addition, the engagement pin 20
is made of an elastic metal pin, and the receiving portion 21
Since the guideline hakama 17 is located at a position biased to one side with respect to a, as is clear from FIG.
It fits into the groove 17a by its own elasticity.

Therefore, when attaching the pointer 16 to the pointer shaft 15, the pointer hakama 17 is first unrotatably attached to the tip of the pointer shaft 15, and the cap 21 and the pointer main body 16b are integrated as described above. Next, the non-circular recess 19 of the pointer body 16b and the pointer hakama 1
7 and the non-circular flange 17b, the guideline hakama 17
When you press the pointer cap from above,
The tip of the needle-shaped guide hakama 17 curves the engagement pin 20 and enters the inside, and the engagement pin 20 enters the groove 17.
a, and both are positioned so that they cannot rotate relative to each other.

To remove the pointer for repair, pull the pointer cap portion 16a upwards, and since one edge of the groove 17a is rounded, the elasticity of the engagement pin 20 will prevent it from engaging with the groove 17a. The pointer 16 and the pointer hakama 17 can be easily separated.

The present invention is as described above, and the pointer and the pointer shaft are connected by a groove in the pointer hakama and an elastic engagement pin that fits into this groove, and the positioning in the rotational direction is determined by the non-circular flange of the pointer hakama. This is done with a non-circular recess that engages with this.

Therefore, the pointer can be mounted with high reliability and a compact mounting structure can be achieved. Furthermore, if the pointer is made of transparent or semi-transparent resin such as acrylic, it can be freely used for indirect illumination (non-pointer light emission) or edge light illumination (pointer light emission).

[Brief explanation of the drawing]

1 to 6 show the conventional device, FIG. 1 is a sectional view of the main part, FIG. 2 is a sectional view of the pointer cap,
Fig. 3 is a bottom view of the pointer cap, Fig. 4 is a sectional view of the pointer stand, Fig. 5 is a top view of the pointer stand, Fig. 6 is a side view of the pointer stand, and Figs. An embodiment of the invention is shown, FIG. 7 is a plan view of the entire instrument, and FIG.
The figure is a side view of the entire instrument internal unit, Figure 9 is a perspective view with a part of the meter removed, Figure 10 is a perspective view showing the tip of the pointer shaft, and Figure 11 is a perspective view showing the bottom of the pointer cap. , FIG. 12 is a sectional view of the main structure, and FIG. 13 is an exploded perspective view of the pointer cap.

Claims (1)

[Scope of utility model registration request] In a pointer attachment device for an instrument in which a pointer, which is made up of an integrally formed pointer part and a cap part, is removably attached to a pointer shaft, a pointer hakama is fixed to the tip of the pointer shaft,
The pointer hakama has a non-circular flange and a ring-shaped groove, and the lower surface of the cap has a hole for receiving the tip of the pointer hakama, an elastic engagement pin that engages with the groove, and the flange. What is claimed is: 1. A pointer mounting device for a meter, which has a non-circular recessed portion that engages with the cap portion, and connects the pointer and the pointer shaft removably and non-rotatably by fitting the cap portion and the pointer hakama.