JP3058242B2 - Indicating instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indicating instrument such as a cross-coil indicating instrument, and more particularly to an indicating instrument suitable for a speedometer of a vehicle.

[0002]

2. Description of the Related Art Conventionally, a magnet rotor is driven in a direction of a combined magnetic field obtained by combining a magnetic field generated by each of a pair of coils with a current varying according to a measured amount. Rotate
A cross-coil type in-vehicle indicating instrument in which a measured amount is displayed by a pointer that rotates together with the magnet rotor is often used.

FIG. 7 shows such a conventional cross-coil type indicating instrument, and a movement 1 of the indicating instrument includes:
It has a cylindrical case 2 with an open upper end, and a coil bobbin 3 is housed inside the case 2. Two coils 4 are wound around the coil bobbin 3 so as to be orthogonal to each other. The coil bobbin 3 is attached to the center of a disk-shaped magnet rotor 5 disposed inside each of the coils 4. The rotating shaft 6 is rotatably disposed. Further, a plurality of holding portions 7 extending in the vertical direction are formed on the outer peripheral portion of the coil bobbin 3, and the inside of each of the holding portions 7 also serves as an electrode penetrating the bottom surface of the case 2. The fixing bolt 8 is screwed.

The movement 1 constructed as described above
The fixing bolt 8 is arranged on the upper surface of a wiring board 9 on which a wiring pattern (not shown) is formed so as to protrude to the lower surface side of the wiring board 9, and a fixing nut 10 is attached to the lower end of the fixing bolt 8. By screwing together, the case 2 and the coil bobbin 3 are fixed, and the movement 1 is fixed to the wiring board 9.

FIG. 8 shows another conventional cross-coil indicating instrument. Two coils 4 are wound inside a case 2 of a movement 1 of the indicating instrument so as to be orthogonal to each other. The coil bobbin 3 is accommodated therein, and a rotating shaft 6 attached to the center of a disk-shaped magnet rotor 5 disposed inside each of the coils 4 is rotatably disposed on the coil bobbin 3. . Further, a holding flange 11 projecting outward from the case 2 is integrally formed at a diametrically symmetric position of a peripheral portion of the coil bobbin 3, and the coil bobbin 3 and the case 2 are connected to a bottom surface of the case 2. The parts are integrally fixed by welding 12.

The movement 1 constructed as described above
Is arranged such that the holding flange 11 is in contact with the back side of the dial 13 on which predetermined characters, scales, etc. are formed, and a fixing screw 14 is attached to the holding flange 11 from the front side of the dial 13. By tightening, the movement 1 is fixed to the back side of the dial 13. The dial 1 at the tip of the rotary shaft 6
The pointer 15 is attached to the front side of the reference numeral 3.

[0007]

However, in the conventional cross-coil type indicating instrument shown in FIG. 7, the fixing bolt 8 screwed to the holding portion 7 of the coil bobbin 3 projects to the lower surface side of the wiring board 9. And by screwing the fixing nut 10 to the lower end of the fixing bolt 8,
The case 2 and the coil bobbin 3 are fixed, and the movement 1 is fixed to the wiring board 9.
In the cross-coil type indicator shown in FIG. 8, the case 2 and the coil bobbin 3 are integrally fixed by welding at the bottom portion of the case 2.

Therefore, the case 2 and the coil bobbin 3
Is extremely troublesome, the workability of assembling the device is extremely poor, and the number of work processes and the number of parts are increased, and the production cost is increased. .

The present invention has been made in view of the above points, and has as its object to provide an indicating instrument which can easily integrate a movement case and a coil bobbin with a simple operation.

[0010]

In order to achieve the above object, an indicating instrument according to the present invention has a coil wound inside a case having an open upper end, and is rotated by energizing the coil. In the indicating instrument having a movement accommodating a coil bobbin that supports a driven rotary shaft, a holding projection is formed on an outer peripheral edge of the case so as to protrude outward, and the outer periphery of the coil bobbin is formed on the peripheral edge of the coil bobbin. A holding flange projecting outward is formed, a fixing hole into which a fixing screw is screwed is formed in each of the holding flanges, and the coil bobbin is housed inside the case at a peripheral portion of the fixing hole. An engaging claw positioned inside the holding protrusion of the case and expanded by screwing a fixing screw into the fixing hole and pressed against the inside of the holding protrusion is formed. It is characterized in that the.

The fixing screw is inserted from the front side of the dial and screwed into the fixing hole to mount and fix the movement on the back side of the dial.

[0012]

According to the indicator of the present invention, the coil bobbin is inserted from the upper opening side of the case, and the coil bobbin is inserted inside the case so that the engaging claw of the holding flange of the coil bobbin is located inside the holding protrusion of the case. In this state, the fixing claw is screwed into the fixing hole of the holding flange of the coil bobbin in this state, so that the engaging claw is expanded outward between the holding protrusions of the case by the tip of the fixing screw. Then, the outer peripheral surface of the engaging claw presses the inside of the holding projection, whereby the case and the coil bobbin can be integrally held.

Since the fixing screw is inserted from the front side of the dial and screwed into the fixing hole to attach and fix the movement on the back side of the dial,
The movement, the case and the dial can be integrated by the fixing screw.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIGS. 1 to 6 show an embodiment of a movement of the indicating instrument according to the present invention applied to a cross-coil type indicating instrument. The movement 1 of the indicating instrument has a cylindrical case 2 having an open upper end. In the present embodiment, a pair of holding projections 16 projecting outward in a substantially U-shape are integrally formed at diametrically symmetric positions on the outer peripheral edge of the case 2. (See FIG. 3).

Inside the case 2, two coils (not shown) are wound so as to be orthogonal to each other, and a coil bobbin 3 supporting a rotary shaft (not shown) driven to rotate by energizing these coils. A pair of holding flanges 11 projecting outward from the case 2 are integrally formed at diametrically symmetrical positions on the peripheral edge of the coil bobbin 3. A fixing hole 17 is formed in the center of each of the holding flanges 11.
An engagement claw 18 that protrudes annularly downward is formed on a peripheral portion of the fixing hole 17 on the lower surface side of the holding flange 11. The engaging claw 18 is located inside the holding projection 16 of the case 2 with the coil bobbin 3 housed inside the case 2.

Further, terminal holes 19 are formed on both sides of each of the holding flanges 11, and each of the coils is connected to an upper end portion of the terminal holes 19. A pin terminal 20 as a male terminal extending in the up-down direction along the peripheral surface of is inserted.

Further, as shown in FIG. 6, the movement 1 constructed as described above is mounted on the back side of a dial 13 on which predetermined characters, scales and the like are formed. , Is attached to the front surface of the main body case 21. A wiring board 9 on which a predetermined wiring pattern is formed is mounted on the back side of the main body case 21, and the movement is provided at a position corresponding to the pin terminals 20 of the main body case 21 and the wiring board 9. A female terminal 22 into which one pin terminal 20 is inserted is electrically connected to the wiring board 9 and is drilled.

Next, a case where the coil bobbin 3 is mounted on the case 2 in this embodiment will be described.

First, the coil bobbin 3 is inserted from the upper opening side of the case 2, and the coil bobbin 3 is placed on the case 2 so that the engaging claw 18 of the holding flange 11 of the coil bobbin 3 is located inside the holding projection 16 of the case 2. Housed inside. In this state, the coil bobbin 3 is brought into close contact with the back surface of the dial 13, and as shown in FIG. It is screwed into the fixing hole 17 of the holding flange 11 of the coil bobbin 3. In this case, in this embodiment, the fixing screw 14 is a tapping screw,
A screw groove can be formed by screwing the fixing screw 14 without forming a screw hole in the fixing hole 17. As shown in FIG. 5B, the engagement claws 18 are expanded outward between the holding projections 16 of the case 2 by the distal ends of the fixing screws 14 by the screwing of the fixing screws 14. The outer peripheral surface of the engaging claw 18 presses the inside of the holding projection 16, whereby the case 2
And the coil bobbin 3 are integrally held.

The dial plate 13 to which the coil bobbin 3 and the case 2 are fixed is mounted on the front surface of the main body case 21 so that the pin terminal 20 attached to the holding flange 11 of the coil bobbin 3 becomes the female terminal 22 of the main body. And is engaged with a predetermined position of the wiring board 9, whereby
The connection between the pin terminals 20 and the wiring board 9 is performed.

Therefore, in the present embodiment, the dial 1 is stored with the coil bobbin 3 housed inside the case 2.
By disposing the fixing screw 14 in the fixing hole 17 of the holding flange 11 of the coil bobbin 3 and disposing the fixing screw 14 in the fixing hole 17 of the coil bobbin 3, the engaging claw 18 is expanded and pressed against the inside of the holding protrusion 16 of the case 2. Movement 1
Can be simultaneously fixed to the case 2 and the coil bobbin 3 when the work of attaching the
The working efficiency can be remarkably increased, the number of parts can be reduced, and the manufacturing cost can be significantly reduced.

In the present invention, the fixing screw 14 is for integrating the dial 13 and the movement 1 in the above embodiment, but is for integrating the other with the movement 1. There may be.

[0023]

As described above, in the indicating instrument according to the present invention, with the coil bobbin housed inside the case, the indicator screw is arranged on the back side of the dial and the fixing screw is inserted into the fixing hole of the holding flange of the coil bobbin. By screwing in, the engaging claw is expanded and pressed against the inside of the holding protrusion of the case, so when performing the work of attaching the movement to, for example, the dial, the case and the coil bobbin are fixed together at the same time Thus, the working efficiency can be remarkably increased, the number of parts can be reduced, and the manufacturing cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an indicating instrument according to the present invention.

FIG. 2 is a plan view showing the coil of FIG. 1 with the coil omitted;

FIG. 3 is an enlarged view of a holding flange portion of FIG. 2;

FIG. 4 is an enlarged perspective view of a part of the case of FIG. 1;

5A is a partial cross-sectional view showing a state before fastening a fixing screw to a coil bobbin, and FIG. 5B is a partial cross-sectional view showing a state after fastening a fixing screw to a coil bobbin.

FIG. 6 is a longitudinal sectional view showing a final assembled state of the movement of the present invention.

FIG. 7 is a longitudinal sectional view showing a conventional indicating instrument.

FIG. 8 is a longitudinal sectional view showing another conventional indicating instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movement 2 Case 3 Coil bobbin 11 Holding flange 13 Dial 14 Fixing screw 16 Holding projection 17 Fixing hole 18 Engagement claw 20 Pin terminal 21 Body case 22 Female terminal

Claims (2)

(57) [Claims] An indicator having a movement in which a coil is wound inside a case having an open upper end and a coil bobbin that supports a rotating shaft that is driven to rotate by energizing the coil. In the above, a holding projection projecting outward is formed on an outer peripheral edge of the case, and a holding flange projecting outward from the case is formed on a peripheral edge of the coil bobbin, and a fixing screw is screwed onto the holding flange. In the state where the coil bobbin is housed inside the case at the periphery of the fixing hole, the fixing hole is located inside the holding projection of the case, and the fixing hole is inserted into the fixing hole. An indicating instrument characterized by forming an engaging claw that is expanded by screwing in a fixing screw and pressed against the inside of the holding projection. 2. The fixing screw according to claim 1, wherein the fixing screw is inserted from the front side of the dial and screwed into the fixing hole to mount and fix the movement on the back side of the dial. Item 1. The indicating instrument according to Item 1.