JPS5854707Y2 - Bimetallic indicator - Google Patents

Description

[Detailed description of the invention] This invention involves winding a hot wire around a bimetal, and converting changes in the amount of current flowing through the hot wire into the amount of heat of the hot wire in response to changes in the detection part of an automobile fuel gauge, thermometer, etc. In a bimetallic indicating instrument that uses the curvature of the pointer to point the pointer, the pointer is bent into an L-shape, and the dial is curved in an arc shape with the pointer shaft, which is the fulcrum of rotation of the pointer, as the fulcrum. This invention relates to an improved structure of a bimetallic indicating instrument mechanism.

Generally, this type of indicating instrument has a holding part 2 formed by bending a part of the frame 1 of the instrument, and the tip side thereof is bent into an L-shape, as shown in FIGS. 1 to 3. A pointer shaft 4, which serves as a pivot point for the formed pointer 3, is welded to the holding portion 2 of the frame 1, and a slot 5 is formed in the pointer 3, and the pointer 3 is attached to the pointer shaft 4. It is pivotally held so that it can rotate freely.

Further, the U-shaped bimetal 9 has a temperature compensating part 6 and an indicating part 8 around which the heating wire 7 is wound. A pin 11 is welded to the tip of the portion 8.
is slidably engaged with the slot 5 of the pointer 3, and the indicator part 8 of the U-shaped bimetal 9 changes depending on the amount of heat applied to the hot wire 7.
is curved to instruct the pointer 3 to rotate about the pointer shaft 4 as a fulcrum, and an adjustment plate 10 is connected on the frame 1 so as to be adjustable and movable, and the adjustment plate 10 is moved to adjust the indicated value. I try to do it.

Further, on the tip side of the pointer 3 which is newly curved into an L-shape, there is formed a dial plate 12 which is curved in an arc shape with the pointer shaft 4 serving as the pivot point of the pointer 3 as a fulcrum. A scale 13 is printed on the surface of 120 to constitute a bimetallic indicator.

Therefore, in the bimetal type indicator having the above configuration, the pin 11 welded to the indicator part 8 moves within the slot 5 formed in the pointer 3 due to the curvature of the indicator part 8 of the U-shaped bimetal 9.
Since the pointer 3 draws a circular arc trajectory with the pointer shaft 4 as a fulcrum by the operation of the pin 11, the L-shaped pointer 3 is moved over the adjustment plate 10 and the U-shaped bimetal 9 position that make up the instrument mechanism, as shown in FIG. The length of the pointer 3 must be made long, and the operating range of the pointer 3 relative to the pointing angle θ of the normal pointer 3, that is, the moving distance, increases in proportion to the length of the pointer 3, so the instrument mechanism The dial 13 naturally becomes larger depending on the size of the instrument panel, and when a plurality of auxiliary instruments such as a fuel gauge and a temperature gauge are installed in a car's instrument panel, the instrument panel itself on which each instrument is arranged becomes larger. This results in an increase in size, requiring measures such as changing the arrangement of each instrument and assembling it, which may even damage the external design.

The present invention solves the above problems, and embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

4 and 5, 20 is a frame to which the bimetal indicator mechanism is assembled, 21 is a holding portion formed by bending a part of the frame 20, and 22 is a frame 2
0 is a pointer shaft welded to the holding part 21, 23 is a pointer shaft 22
23A is a bending instruction part on the tip side of the pointer 23 bent in the shape of an L-shape;
24 is a slot formed in the pointer 23 at a position near the rotational fulcrum of the pointer 23; 25 is an adjustment plate slidably or rotatably disposed on the frame 20; 26 is an adjustment plate 25
A U-shaped bimetal 27 is fixed to the top of the U-shaped bimetal 26, and a temperature compensating portion whose one end is fixed to the adjustment plate 25 is formed together with the temperature compensating portion 27 in the U-shaped bimetal 26. 29 is a hot wire wound around the indicating portion 28 of the U-shaped bimetal 26, and 3° is a pin welded to the tip of the indicating portion 28 of the U-shaped bimetal 26 and engaged in the slot 24. , 31 is curved by drawing an arc around the pointer shaft 22, which is the rotational fulcrum of the pointer 23, on the inner side of the bending instruction portion 23A, which is the tip side of the pointer 23, which is bent into an L-shape. 32 indicates a scale provided on the surface of the dial 31.

Further, the indicated direction of the pointer 23 is located on the opposite side to the position where the adjustment plate 25 and the U-shaped bimetal 26 around which the heating wire 29 is wound, which constitute the instrument mechanism, are disposed.

In general, the amount of bending displacement of the indicating portion 28 of the U-shaped bimetal 26 is relatively displaced by a prescribed range amount depending on the amount of heat generated by the prescribed amount of current applied to the hot wire 29 wound around the indicating portion 28. Therefore, the pointing angle θ of the normal pointer 23
is determined by the distance between the pointer shaft 22 and the pin 30 engaged in the slot 24 of the pointer 23.

As configured above, the bimetal type indicating instrument of the present invention has an L-shaped bimetal 26 that connects the pointer 23 to provide an indication, and an L-shaped instrument mechanism such as an adjustment plate 25 that holds this bimetal 26 and a suspension at a separate position. A bending instruction section 23A is placed at the tip of the pointer 23 which is bent to
Since the instrument mechanism of the indicator is not located within the rotation locus in which the bending instruction section 23A, which is the instruction side, moves in a circular arc, the bending instruction section 23A of the pointer 23 moves as shown in FIG. can be formed without contacting other components, and the distance l from the pointer shaft 22 to the bending instruction part 23A of the pointer 23
can be set short.

Therefore, the size of the dial 31 to be assembled to the instrument panel can be reduced, the instrument can be mounted relatively unrestricted, and the external design of the instrument can be improved.

In addition, for example, when setting the dial 31 of the instrument to a large size, the indicating angle θ of the pointer 23 is set to a single angle from the beginning, and the main body of the bimetallic indicating instrument is configured as one type, and from the pointer shaft 22 to the pointer. By providing a plurality of pointers 23 having different lengths 11 and 12 of the distance l to the bending instruction portion 23A of 23, the indicated width of the pointer 23, that is, the rotation instruction range of the pointer 23 can be adjusted to each of the above-mentioned points. The indicated range L1 of the pointer 23 is proportional to the lengths 11 and 12 of the pointer 23. L2
The above-mentioned pointer 23 corresponds to the size of the dial 31 of each meter arranged on the instrument panel, in other words, the indicated range of the scale 32 of the dial 31 formed on the indicating meter.
It is possible to construct a bimetallic indicating instrument having standardized indicating characteristics by simply selecting and incorporating it into the instrument mechanism.

Furthermore, even when assembling indicating instruments with different indicating ranges as described above, the adjusting plate 25 and the U-shaped bimetal 26 around which the heating wire 29 is wound, except for the pointer 23, are all common parts. It is possible to supply parts and standardize parts.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a bimetallic indicator of the conventional device, Fig. 2 is a front view of Fig. 1, Fig. 3 is a top view showing the operating state of Fig. 1, and Fig. 4 is a view of the device of the present invention. FIG. 5 is a perspective view showing the embodiment, and FIG. 5 is a top view showing the operating state of FIG. 4. Frame: 20, Pointer shaft: 22, Pointer: 23, Bending indicator: 23A, Slot: 24, Adjustment plate: 25, U-shaped bimetal: 26, Temperature compensator: 27, indicator: 28, Heat wire: 29 , Pin: 30°

Claims (1)

[Scope of utility model registration request] A U-shaped bimetal having a temperature compensating part and an indicating part around which a heating wire is wound is fixedly held on the adjustment plate, and the U-shaped bimetal is connected to the frame via the adjustment plate so as to be rotatable or movable. A pin is fixed to the tip of the indicating portion of the U-shaped bimetal, and this pin is movably engaged in a slot formed in the pointer, and as the object to be measured changes, the pointer is moved around the pointer shaft as a fulcrum. In a bimetallic indicating instrument that is operated in conjunction with the curved displacement of a U-shaped bimetal indicating section, the adjustment plate and hot wire formed on the frame are wound around the axis position of the pointer shaft as a reference point. A bending indicator at the tip of the pointer, which is bent into an L-shape, is arranged on the side opposite to the mounting position of the U-shaped bimetal. A bimetallic indicator characterized in that the distance between the two points can be arbitrarily selected, and the width of the rotation instruction range of the pointer can be arbitrarily set.