JPH038983Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting device for an instrument such as an automobile speedometer, and in particular, an instrument unit is constructed by combining a dial formed in advance with separate members and an instrument drive section with a pointer. The present invention also relates to an installation guide for positioning this instrument unit in a case and attaching it by screwing means such as screws.

A conventional device of this type is shown in FIGS. 1 and 2.

Fig. 1 is a perspective view showing a state where the instrument is attached to the case, and Fig. 2 is a front view with a part of the mounting part cut away. (Only the book is shown) Boss 2
A substantially rectangular dial plate 3 and a light guide plate 4 bonded to the dial plate 3 are placed on the boss 2, and a central portion of the dial plate 3 has a A pointer 5 is arranged, and a drive section 6 for driving the pointer 5 is provided at the lower part of the dial plate 3.

The instrument mounting structure is as shown in Figure 2. That is, the lower part of the drive section 6 has a male screw section 6a.
is formed, and this male threaded portion 6a passes through the case 1 and is screwed onto the case 1 with a nut 7. Furthermore, a flange portion 6b is formed at the lower part of the drive portion 6, and this flange portion 6b is screwed onto the case 1 with a screw 8.

On the other hand, a protrusion 4a is provided on the back surface of the light guide plate of the dial 3 and the light guide plate 4 which are integrated with the drive unit 6 in advance, and a recess 4b is formed on the lower surface of this protrusion 4a, and the top surface of the boss 2 The recess 4b fits into the guide pin 2a formed in the guide pin 2a, which positions the dial 3 and the light guide plate 4 in the plane direction (X-Y direction shown in FIG. 1). The dial 3 and the light guide plate 4 are positioned in the vertical direction (Z direction shown in FIG. 1) by contacting the top surface of the dial plate 3 and the light guide plate 4.

However, in the above conventional example, when the nut 7 or the screw 8 is tightened when the instrument unit is attached to the case 1, the dial plate 3 and the light guide plate 4 are
There is no movement in the -Y direction, and the drive part 6 is twisted somewhat by the tightening torque. As a result, the driving part 6 itself is subjected to stress, which tends to cause a loss of accuracy, and there is also a drawback that the predetermined positional relationship between the dial plate 3 and the pointer 5 is shifted.

This invention was created in view of the above drawbacks, and is an instrument installation guide that alleviates the external force applied to the drive unit when fixing the drive unit to the case, protects the drive unit, and eliminates misalignment with the dial. This is what we are trying to provide.

Embodiments of the present invention will be described below based on the drawings. In addition, the dial 3, the light guide plate 4, the pointer 5, the drive unit 6
The screwing structure of the drive unit 6 to the case 1 is shown in Figure 1.
Since it is the same as the conventional example shown in FIG. 2, the same reference numerals are given and the explanation will be omitted.

FIG. 3 is a sectional view showing the relationship between the dial and the boss in the embodiment of the present invention.

In the figure, a protrusion 4a is formed on the light guide plate 4 bonded to the back surface of the dial 3, and this protrusion 4a
A recess 4b is provided on the lower surface. On the other hand, the boss 2 protruding from the case 1 made of rigid resin has a guide pin 2a at its center, a ring-shaped groove 2b is formed around the guide pin 2a, and the outer periphery of the groove 2b is connected to the guide pin 2a. A regulating member 2c of 2a is provided, thereby imparting elasticity to the guide pin 2a in the plane direction of the dial 3 (X-Y direction). The guide pin 2a fits into the recess 4b of the light guide plate 4, and the top surface of the boss 2 around the guide pin 2a abuts the lower surface of the protrusion 4a.

Therefore, when tightening the nut 7 and screwing the drive unit 6 onto the case 1, an external force in the direction of the tightening rotation is transmitted to the dial 3 via the drive unit 6, and the dial 3 is moved to the guide pin 2a. Although the position is thus regulated in the X-Y directions, the torsional force applied to the driving part 6 itself or between the driving part 6 and the dial 3 is somewhat absorbed by the elastic force of the guide pin 2a. Then, when a strong tightening force is applied to the nut and the guide pin 2a is largely bent, the side surface of the guide pin 2a comes into contact with the regulating member 2c via the groove 2b, thereby fixing the position of the dial 3 relative to the case 1. This prevents damage to the guide pin 2a.

FIG. 4 shows a modified example of the structure around the guide pin 2a, in which a guide pin 2a with a small diameter and a wall 2d are set up directly from the bottom of the case 1, and the upper surface of the wall 2d is placed on the side of the dial 3. The guide pin 2a is brought into contact with the lower surface of the protrusion 4a, and the side surface of the wall portion 2d serves as a regulating member 2c for the guide pin 2a.

The present invention is as described above, and elasticity is imparted to the guide pin in the direction of tightening rotation when screwing the drive unit, and a regulating member is provided around the guide pin to limit the amount of deflection of the guide pin. It is characterized by:

Therefore, the dial is positioned at a predetermined position by the guide pin and the regulating member, and the elastic guide pin absorbs the torsion force generated when the drive unit is screwed, so the drive unit itself is protected. In addition, there is no misalignment between the drive unit and the dial, and the accuracy of the instrument can be maintained. Moreover, the guide pin can be prevented from being damaged by the regulating member.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the entire mounting structure of a conventional meter, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a sectional view of the main part of the embodiment of the present invention, and Fig. 4 is a sectional view of the main part of the present invention. FIG. 7 is a sectional view showing a modification of the main part of the invention. 1...Case, 2a...Guide pin, 2c...
Regulating member, 3... Dial plate, 5... Pointer, 6... Drive unit.

Claims (1)

[Scope of utility model registration request] In the instrument installation guide in which a dial and a pointer are attached to a drive part, the drive part is screwed to a case, and the dial is positioned by a guide pin provided in the case, the guide pin includes: An instrument installation guide that provides elasticity in the direction of tightening rotation when screwing the drive unit, and includes a regulating member around the guide pin that limits the amount of deflection of the guide pin.