JPH0618594A - Overcurrent passage display device - Google Patents

Abstract

PURPOSE:To simplify the constitution of the title display device as a whole and, at the same time, to improve the reliability of the device by eliminating the need of using a colored fluid which causes an erroneous display due to a pigment precipitated from the fluid. CONSTITUTION:A display cylinder 1 is put on the inner peripheral surface of a cylindrical oil case S. A transparent fluid 11 is stored in the case S and a valve body 12 tied with a wire 9 is positioned to a lower position in the fluid 11. The inside surface of the cylinder 1 and valve body 12 are colored in different colors. When the inside of the case S is looked at through a concave lens 10 at the bottom of the case S at normal time, the silver color of the valve body 12 can be visually confirmed, indicating a normal displaying state. When the inside of the case S is seen through the lens 10 in case an overcurrent passes, the red color of the inside surface 1a of the cylinder 1 can be visually confirmed, indicating the passage of the overcurrent, because the body 12 is pulled up when the overcurrent is detected. Thereafter, the body 12 descends in the fluid 11 and returns to the normal displaying state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overcurrent display device, and more particularly to an overcurrent display device which is hung directly on an electric line and indicates that an overcurrent due to a ground fault, a short-circuit accident or the like has passed. It is a thing.

[0002]

2. Description of the Related Art The present applicant has already filed Japanese Patent Application Laid-Open No. 57-19157.
An overcurrent passing display device such as that disclosed in Japanese Patent No. 0 has been proposed. This conventional device is a transparent oil case in which a colored fluid having a small specific gravity and a transparent fluid having a large specific gravity, such as oil that does not mix with each other, are stored in upper and lower layers in the same fluid. It is colored differently from the colored fluid,
The display valve, which has a specific gravity larger than that of the colored fluid and a specific gravity smaller than that of the transparent fluid, is vertically movable. Then, in the normal display state in which the passage of the overcurrent is not detected, the display valve floats on the transparent fluid of the lower layer and is positioned so that the entire lower surface thereof is in contact with the upper surface of the transparent fluid, thereby changing the color of the display valve to the ground or the like. On the other hand, when the passage of an overcurrent is detected, the indicator valve is pulled up into the colored fluid in the upper layer by an operating member so that the color of the colored fluid can be visually confirmed from below and an overcurrent passage is displayed. It was a thing.

[0003]

However, in the above-mentioned conventional device, a pigment such as red is mixed in the colored fluid for the purpose of improving the distinguishability, so that there is the following problem.

That is, it is very difficult to control the quality of blending the pigment, and the quality of the pigment may cause precipitation of the pigment when the product is left standing for a long time. Therefore, in the normal display state, if the precipitated pigment enters the lower side of the display valve floating above the transparent fluid, the color of the pigment, that is, the overcurrent There is a possibility that the color of the colored fluid showing the passing state may be visually recognized and cause an erroneous display.

The present invention has been made in view of the above problems, and an object thereof is to eliminate the use of a colored fluid mixed with a pigment which causes an erroneous display and to improve the reliability of overcurrent display. To provide an improved overcurrent display device.

[0006]

In order to achieve the above object, the invention of claim 1 stores a fluid in a case and disposes a valve element connected to an operating member in the fluid, When an overcurrent is detected, the valve body is pulled up via the actuating member to display an overcurrent passage, and after the overcurrent is eliminated, the valve body is delayed and lowered by its own weight to return to a normal display state. The gist is that a transparent member having a light diverging action is provided on the bottom of the case, the inner surface side of the case and the valve body are given different display colors, and a transparent fluid is used as the fluid.

According to the second aspect of the invention, a valve body is provided which stores fluid in the case and is connected to the actuating member in the fluid, and the valve element is actuated via the actuating member when overcurrent is detected. In an overcurrent passage display device that pulls up to display an overcurrent passage, and after the overcurrent is eliminated, the valve body is delayed and lowered by its own weight to return to a normal display state, in which a translucent light having a light converging action on the bottom of the case. The gist is that a member is provided, a display portion provided with a display color different from that of the valve body is provided corresponding to the focus of the translucent member, and a transparent fluid is used as the fluid.

Further, according to the invention of claim 3, a valve body which stores fluid in the case and is connected to the operating member is disposed in the fluid, and when the overcurrent is detected, the valve body is inserted through the operating member. In the overcurrent passage display device in which the valve body is pulled up to display the overcurrent passage, and after the overcurrent is eliminated, the valve body is delayed and lowered by its own weight to return to the normal display state. In addition to providing a reflective member having a light converging effect, the valve body penetrates the reflective member in the normal display state and projects toward the translucent member, and a display color different from the reflective surface of the reflective member is applied. The gist is that a rod is provided and a transparent fluid is used as the fluid.

[0009]

That is, in each of the first to third aspects of the invention, when the passage of the overcurrent is detected, the valve member is pulled upward by the actuating member against the viscosity of the transparent fluid in the case.

Then, according to the first aspect of the invention, the valve body, which has been seen large through the light-transmitting member, becomes small, and the color of the valve body becomes almost invisible. On the contrary, the inner surface side of the case, which was barely visible until then, becomes large due to the light diverging action of the translucent member, and the color of the inner surface side of the case is visually recognized from below.

Further, according to the second aspect of the invention, the bottom surface of the valve body, which had been largely visible through the light-transmitting member, can no longer be seen, and the color of the valve body cannot be visually recognized. On the contrary, the display portion, which has been seen to be extremely small, becomes larger due to the light converging action of the translucent member, and the color of the display portion is visible from below.

Furthermore, in the invention of claim 3, the indicator rod is also pulled inward with the pulling-up of the valve body,
The amount of protrusion of the display rod penetrating the reflecting member is reduced.
Therefore, the color of the display bar, which has been largely reflected on the reflection surface of the reflection member, is hardly visible, and on the contrary, the color of the reflection surface itself, which was hardly visible until then, is visually recognized from below.

As described above, in each of the first to third aspects of the invention, the distinction between the normal display state and the overcurrent passing display state is confirmed by the change in the color visually recognized from below.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. The overcurrent display device according to the present invention is roughly classified into a conventional device (Japanese Patent Application Laid-Open No. 57-57,572).
(See Japanese Patent Laid-Open No. 191570), a current detection unit A that detects an overcurrent, a display drive unit B that operates based on the detection result of the detection unit A, and drive transmission that transmits the drive force of the display drive unit B. The mechanical unit H and a display device I that performs a display operation by the operation of the drive transmission mechanical unit H are configured. And, it differs from the conventional device only in the configuration relating to the display device I. 1, L is an electric wire, CT is a current transformer, D is a drive control circuit, and RS is a rotary solenoid. Therefore, the following description will focus on the configuration and operational effects of the display device I. First Embodiment First, a first embodiment (one embodiment relating to the invention described in claim 1) will be described with reference to FIGS.

In FIG. 1, S is a cylindrical oil case made of colorless transparent synthetic resin or the like, and a display cylinder 1 made of an aluminum tube is fitted therein. This display tube 1
In the inner wall surface 1a of the above, only the inner wall surface portion near the lower end corresponding to the Fluorinert layer described later is colored silver, and almost all the inner wall surface portions above it are colored red which is visually recognized in the overcurrent passage display state. . Further, on the outer peripheral portion of the lower end of the oil case S, a hook portion 3 having a diameter increased via a locking step portion 2 is provided so as to project downward. The oil case S is arranged and fixed to the lower portion of the main body case 4 by screwing the outer periphery of the hook 3 to the lower end opening 4 a of the main body case 4. A locking projection 5 is provided on the inner periphery of the opening 4a, and an annular groove 6 is formed on the lower surface of the locking projection 5. The watertightness is secured by pressing the locking step portion 2 of the oil case S against the O-ring 7 arranged in the groove 5.

Reference numeral 8 denotes a synthetic resin lid which is water-tightly bonded to the upper opening of the oil case S, and has an operating member operatively connected to the rotary solenoid RS of the drive transmission mechanism H at the center. An insertion hole 8a for inserting the wire 9 is formed. Reference numeral 10 denotes a concave lens as a light-transmitting member having a light diverging action, which is screwed into the lower end opening of the oil case S, and its concave surface is on the lower side, that is, the focal point of the concave lens 10 is outside the oil case S. Is fixed as. Therefore, the external light rays that enter the oil case S from below are diffused toward the inner wall surface colored red of the inner wall surface 1a of the display cylinder 1 by the light diverging action of the concave lens 10.

Further, the required amount of the transparent fluid 11 is stored inside the oil case S. The transparent fluid 11 is preferably a liquid having a small change in viscosity due to changes in external environmental conditions. Therefore, in this embodiment, transparent Fluorinert (trademark owned by Minesota Mining & MFG Company) 1
A small amount of 1a and similarly transparent silicone oil 11b are used. Due to the difference in specific gravity between the liquids 11a and 11b, the Fluorinert 11a is stored in the lower layer to a height corresponding to the silver portion provided near the lower end of the inner wall surface 1a of the display cylinder 1, and the silicone oil 11b is stored in the upper layer. It Further, since both the Fluorinert 11a and the silicone oil 11b are transparent, no coloring agent such as a pigment that precipitates when left standing is not mixed. The reason why the inner wall surface 1a of the display cylinder 1 is colored silver only in the vicinity of the lower end corresponding to the Fluorinert 11a reservoir is that when the entire inner wall surface 1a is made red,
When the silver-colored valve body 12 floats on the Fluorinert 11a layer and is in the normal display position, the inner wall surface 1a is formed on the lower surface of the valve body 12.
This is because the red color is reflected and it becomes difficult to perform the visual recognition work in the normal display state, which should be visually recognized as silver as a whole.

A flexible disc-shaped valve body 12 is attached to the lower end of the wire 9. The valve body 12 is made of an aluminum plate having a specific gravity slightly higher than that of the silicone oil 11b and a specific gravity lower than that of the Fluorinert 11a, and has a red color which is applied to almost all the inner wall surfaces of the inner wall surface 1a of the display cylinder 1. On the other hand, it is given a distinctive silver color. Then, it is fitted to the inner circumference of the display cylinder 1 so as to be vertically movable with a minute gap, and is connected to the wire 9 so as to be constantly floated on the upper surface of the Fluorinert 11a and between the upper surface of the concave lens 10. A slight gap is provided. Note that FIG. 1 shows that the valve body 12 is in a lower position floating on the upper surface of the Fluorinert 11a and is in a normal display state, and when the passage of an overcurrent is detected, the upper position shown by a chain double-dashed line by the wire 9 is shown. It can be pulled up against the viscosity of the silicone oil 11b.

Next, the operation of the overcurrent display device constructed as described above will be described. First, when the inside of the oil case S is viewed through the concave lens 10 from below on the ground when the valve body 12 is at the lower position shown in FIG. 1, FIG.
As shown in Fig. 1, only the silver color of the valve body 12 is visually recognized, and the display cylinder 1
The red color applied to the upper side of the inner wall surface 1a is not visible. Therefore, the silver color of the valve body 12 is visually confirmed to confirm the normal display state.

On the other hand, when the passage of the overcurrent is detected, the valve body 12 is pulled up to the upper position shown by the chain double-dashed line via the wire 9. Then, after that, the concave lens 1
Even if the inside of the oil case S is viewed through 0, the valve body 12 in the upper position looks very small as shown in FIG. 2B due to the light diverging action of the concave lens 10, and it looks large until then. The silver color of the body 12 becomes almost invisible. On the contrary, the inner wall surface 1a of the display cylinder 1 which has been invisible until then becomes visible due to the light diverging action of the concave lens 10, and the red color applied to the upper side of the inner wall surface 1a is visually recognized largely. Therefore, the red color of the inner wall surface 1a is visually confirmed, which confirms the overcurrent passage display state.

After the passage of the overcurrent is detected, when the suspension support at the upper position by the wire 9 is released, the valve body 12 starts descending in the silicone oil 11b by its own weight. At this time, since the specific gravity of the valve body 12 is set to be slightly larger than the specific gravity of the silicone oil 11b, the valve body 12 is delayed by the viscous resistance of the silicone oil 11b and reaches a lower position in the display cylinder 1 after a predetermined time. Will be restored. Then, again, as shown in FIG. 2 (a), the red color above the inner wall surface 1a of the display cylinder 1 is no longer visible,
On the contrary, the silver color of the valve body 12 becomes large and visually recognized.
Therefore, the silver color of the valve body 12 is visually recognized through the concave lens 10 to confirm the normal display state.

As described above, in this embodiment, depending on the positioning of the valve body 12 in the oil case S before and after the detection of the passage of the overcurrent, the color in the oil case S visually recognized through the concave lens 10 is changed from silver to red, or Since it clearly changes from red to silver, it is possible to easily distinguish and confirm from the lower part of the ground or the like whether the overcurrent passage display state or the normal display state.

Further, except that the concave lens 10 having a light diverging action is used as the translucent member screwed to the bottom of the oil case S, there is no structural complexity compared with the conventional device, and rather the oil case. Since the color of the fluid stored in S is only one transparent color, it is possible to dispense with the previously required colored fluid. Therefore, a coloring pigment that may enter the lower side of the valve body 12 and precipitate when left in a stationary state is not mixed, so that an erroneous display due to the precipitation of the pigment is prevented. Therefore, the reliability of the display device I can be improved.

In this embodiment, the inner wall surface 1a of the display cylinder 1 made of an aluminum tube or the like is colored red.
The display cylinder 1 may be formed of red synthetic resin or the like, or the inner peripheral surface of the colorless and transparent oil case S may be directly colored with red. However, as described above, the portion near the lower end of the inner wall surface corresponding to the reservoir of the Fluorinert 11a needs to be silver-colored as in the above embodiment. Further, the respective colors of the inner wall surface 1a of the display cylinder 1 (excluding the portion near the lower end) and the valve body 12 are not limited to red and silver as long as the two can be distinguished from each other, and can be arbitrarily changed. Is. Further, in the above-mentioned embodiment, the concave lens 10 as the translucent member is screwed to the lower end opening of the oil case S, but the mounting structure such as fitting or adhering is optional, and it is colorless and transparent. The concave lens 10 may be integrally formed on the bottom of the oil case S. Moreover, the concave lens 10 may be used by stacking a plurality of lenses such as two lenses,
The oil case S is not limited to the cylindrical shape and may be a prismatic shape. Second Embodiment Now, FIGS. 3 and 4 show a second embodiment (another example 1 of the first embodiment relating to the invention described in claim 1). It differs from the first embodiment only in that a multifocal concave lens 13 is used as a light transmitting member having a light diverging action. The concave surfaces of the multifocal concave lens 13 are formed such that the focal length is shorter than that of the concave lens 10 of the first embodiment, and the concave surfaces are formed so that the concave surfaces are more outward than the concave surface at the center of the lens. Has been loosened. Therefore, the focal length is made shorter toward the outer concave surface. However, even when the light rays entering the oil case S enter through the outermost concave surface, they are diffused toward the inner wall surface 1a of the display cylinder 1 which is colored red.

The use of this multifocal concave lens 13 has a shorter focal length than the case of using the concave lens 10 having one focal point, so that the delay of the valve body 12 from the upper position after the overcurrent display is delayed. The silver color is not visually recognized until near the lower position, which is the normal display state. Therefore, according to the configuration of the second embodiment, the fact that the overcurrent has passed can be continuously displayed for a longer period of time than in the case of the first embodiment, and it can greatly contribute to the detection of the fault point of the electric line. There are advantages. The other operational effects are similar to those of the first embodiment. Third Embodiment Next, FIG. 5 shows a third embodiment (another example 2 of the first embodiment relating to the invention described in claim 1). In this embodiment, the multifocal concave lens 1 in the second embodiment is used as a light transmitting member having a light diverging action.
A special concave lens 15 having a prism 14 at the center of 3 is used.

The reason why such a special concave lens 15 is used is as follows. That is, in the multi-focal concave lens 13, concave surfaces must be concentrically formed over the entire lens surface, and the concave surfaces must be formed so as to become gentler toward the outside of the lens center. Was a hassle. Therefore,
If the prism 14 having a function of dispersing light rays as in the case of the multifocal concave lens 13 is formed on the entire lens surface, the processing operation is easy and almost the same effect as when the multifocal concave lens 13 is used can be expected. It was considered.

However, when the entire lens surface is the prism 14, unlike the case of the multifocal concave lens 13,
A light ray incident into the oil case S through the prism 14 outside the center of the lens surface is directed by the refraction of the prism 14 to a silver portion colored near the lower end of the inner wall surface 1a of the display cylinder 1, and the silver color There is a problem that it is difficult to confirm the red color of the overcurrent passage display because the portion is displayed in a ring even in the overcurrent passage display state. In order to solve this problem, the light rays incident from the prism 14 on the outer side of the lens surface into the oil case S are diffused to the upper side of the inner wall surface 1a of the display cylinder 1, that is, to the inner wall surface portion colored red. Need to let. This problem does not occur when the multifocal concave lens 13 is adopted.

Therefore, it is necessary to combine two advantages, one is an advantage in manufacturing that is possible when the prism 14 is used, and the other is an advantage when the multifocal concave lens 13 is capable of eliminating the confusingness of the display confirmation. , Multifocal concave lens 13
The special concave lens 15 shown in the third embodiment is formed by the prism 14 at the central portion of the above. The prism 14 formed in the central portion is formed such that the angle of the triangular peak is 25 ° as shown in FIG.

Therefore, the special concave lens 1 of the third embodiment
In the case of No. 5, when the valve body 12 is in the upper position shown by the chain double-dashed line in FIG. 1, the colored silver portion near the lower end of the inner wall surface 1a of the display cylinder 1 makes the entire lens surface the prism 14. It is not projected in a ring shape as in the case, and a red display is visually recognized through the entire lens surface, and it is easily confirmed that the display is in an overcurrent passing display state. On the other hand, when the valve body 12 is in the lower position shown by the solid line in FIG. 1, the silver normal display state is visually recognized through the entire lens surface. And
Since the central portion of the lens is the prism 14 which is relatively easy to process without forming a troublesome concentric circular concave surface on the entire lens surface, it is manufactured more than the case of the multifocal concave lens 13 in the second embodiment. The cost can be reduced. [Fourth Embodiment] Next, a fourth embodiment (one embodiment relating to the invention described in claim 2) will be described with reference to FIGS.

The fourth embodiment is different from the first to third embodiments in that a convex lens 16 having a light converging function is used as a light transmitting member. Also,
A display portion 17 colored in red is provided at the center of the bottom surface of the valve body 12 to distinguish the valve body 12 from the silver color. The display cylinder 1 is not fitted inside the oil case S for the reason described below. The rest of the configuration is the same as in the first to third embodiments.

In this embodiment, in the normal display state shown in FIG. 6, the convex lens 16 is applied from below the ground.
When the inside of the oil case S is viewed through, the silver color on the bottom surface of the valve body 12 is largely visible as shown in FIG. 7A, and the red color of the display unit 17 is hardly visible. Therefore, the silver color on the bottom surface of the valve body 12 is visually recognized to be a normal display state.

On the other hand, when the passage of the overcurrent is detected, the valve body 12 is pulled up to the upper position in the oil case S via the wire 9. Then, even if the inside of the oil case S is viewed through the convex lens 16 from below, the silver color on the bottom surface of the valve body 12, which is the peripheral portion of the display unit 17, is visually recognized by the light converging action of the convex lens 16 as shown in FIG. 7B. become unable. On the contrary, the display portion 17 which has been seen to be extremely small until then becomes large due to the light converging action of the convex lens 16, and the red color applied to the display portion 17 is visually recognized large. Therefore, when the red color of the display unit 17 is visually recognized, it is confirmed that the overcurrent passing display state is provided from below the ground.

After detecting the passage of the overcurrent, the valve body 1
2 descends in the silicone oil 11b by its own weight and returns to the lower position in the oil case S again. Then,
As shown in FIG. 7A, the red color of the display unit 17 is hardly visible, and conversely, the silver color on the bottom surface of the valve body 12 is largely visible. Therefore, the silver color on the bottom surface of the valve body 12 is visually recognized through the convex lens 16 to confirm the normal display state.

As described above, also in the fourth embodiment, the convex lens 16 (that is, the translucent member) is obtained by positioning the valve body 12 in the oil case S before and after the detection of the passage of the overcurrent.
The color in the oil case S visually recognized through changes clearly from silver to red, or from red to silver, and it is easy to determine whether it is the overcurrent passage display state or the normal display state from below the ground etc. You can check. Further, as in the case of the first to third embodiments, the transparent fluid 11 is stored in the oil case S, and the coloring pigment that may precipitate on the upper surface of the convex lens 16 is not mixed. ,
It is possible to prevent erroneous display due to the precipitation of the pigment, and improve the reliability of the display device I.

In the fourth embodiment, unlike the first to third embodiments using the concave lens 10 having a light diverging action, the convex lens 1 having a light converging action is used.
6 is used, the color on the inner peripheral surface side of the oil case S is not visually recognized through the convex lens 16. Therefore, it is not necessary to fit the red-colored display cylinder 1 inside the oil case S for the purpose of identifying the overcurrent display. [Fifth Embodiment] Next, a fifth embodiment (an embodiment relating to the invention described in claim 3) will be described with reference to FIGS.

In the fifth embodiment, a concave member 10 (including the multifocal concave lens 13) or a convex lens 16 is not used as a transparent member for transmitting light but a reflecting member for reflecting light is screwed to the bottom of the oil case S. It is different from each of the above embodiments in that it is worn. That is, reference numeral 18 shown in FIG. 8 is a concave mirror as a reflecting member having a light converging function, and an insertion hole 19 is formed in the mirror core of the concave mirror 18. Reference numeral 20 denotes a synthetic resin transparent lens as a translucent member that covers the bottom of the concave mirror 18, and unlike the translucent member in each of the above-described embodiments, the surface is not uneven.

Reference numeral 21 is a display rod projecting downward from the center of the bottom surface of the valve body 12, and is colored red like the display portion 17 in the fourth embodiment. The display bar 21 is inserted through the insertion hole 19 so as to be movable in the vertical direction, and always protrudes from the mirror surface 18a of the concave mirror 18 toward the focal direction of the concave mirror 18, as shown in FIG. There is. In addition, the diameter of the insertion hole 19 is formed larger than the diameter of the display rod 21 so as not to hinder the vertical movement of the display rod 21. The other structure is the same as that of the fourth embodiment.

Now, in this embodiment, when the normal display state shown in FIG.
When the mirror surface 18a of the concave mirror 18 is viewed through 0,
As shown in (a), due to the light converging action of the concave mirror 18, the red color of the display rod 21 protruding from the mirror surface 18a is largely projected on the mirror surface 18a. Therefore, the red color of the display bar 21 is visually recognized to be a normal display state.

On the other hand, when the passage of the overcurrent is detected, the display rod 21 also moves upward together with the valve body 12, so that the protruding portion of the display rod 21 is almost drawn into the insertion hole 19 and the mirror surface 18 is formed.
The tip portion of the display rod 21 slightly projects from a. Then, after that, from below, the mirror surface 18a of the concave mirror 18 is
Even if you look at it, since the red color of the display rod 21 is hardly reflected on the mirror surface 18a, the red color of the display rod 21 is as shown in FIG.
As shown in (b), it becomes almost invisible. On the contrary, the color (silver color) of the mirror surface 18a itself of the concave mirror 18 which is hardly visible until now becomes visible over the entire mirror surface 18a. Therefore, by visually recognizing the silver color of the mirror surface 18a itself, it is confirmed that the overcurrent passage display state is set.

After detecting the passage of the overcurrent, the valve body 1
2 descends in the silicone oil 11b by its own weight and returns to the lower position in the oil case S again. Then,
As shown in FIG. 9 (a), the silver color on the mirror surface 18a is hardly visible, and on the contrary, the display rod 21 again largely projects from the mirror surface 18a, so that the red color of the display rod 21 is visually recognized by the light converging action of the mirror surface 18a. Become so. Therefore, the red color of the display bar 21 projected on the mirror surface 18a is visually recognized, and thus it is confirmed that the display state is the normal display state.

As described above, also in the fifth embodiment, the color visually recognized through the mirror surface 18a of the concave mirror 18 is changed from silver to red by the positioning of the valve body 12 in the oil case S before and after the detection of the passage of the overcurrent. Alternatively, it can be clearly changed from red to silver, and it can be easily discriminated and confirmed from below on the ground or the like whether it is the overcurrent passage display state or the normal display state.

Further, as in the case of each of the above-described embodiments, the transparent fluid 1 in which the pigment is not mixed in the oil case S is used.
Since 1 is stored, it is possible to prevent erroneous display due to the precipitation of the pigment on the upper surface of the transparent lens 20.
The reliability of the display device I can be improved.

In the fifth embodiment, the concave mirror 18 which is a reflecting member rather than a light transmitting member such as the concave lens 10 is used.
Therefore, the inside of the oil case S is not visually recognized. Therefore, especially for the purpose of identifying the overcurrent display, it is not necessary to fit the display cylinder 1 inside the oil case S as in the case of the fourth embodiment.

[0044]

As described above in detail, according to each of the first to third aspects of the present invention, the use of the colored fluid, which has been necessary together with the transparent fluid up to now, is unnecessary, and the entire structure of the display device is simplified. It is possible to improve the reliability of the display device because it is possible to prevent the occurrence of erroneous display by eliminating the use of the pigment that has been settled in the case and caused the erroneous display. Produce an effect.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a first embodiment embodying the present invention.

FIG. 2 is a diagram showing respective display states of a normal display and an overcurrent passage display according to the first embodiment.

FIG. 3 is a sectional view of a display device of a second embodiment.

FIG. 4 is a bottom view of a multifocal concave lens.

FIG. 5 is a sectional view of a display device according to a third embodiment.

FIG. 6 is a sectional view of a display device according to a fourth embodiment.

FIG. 7 is a diagram showing each display state of a normal display and an overcurrent passage display according to a fourth embodiment.

FIG. 8 is a sectional view of a display device according to a fifth embodiment.

FIG. 9 is a diagram showing each display state of a normal display and an overcurrent passage display according to a fifth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display cylinder, 4 ... Main body case, 9 ... Wire as an operating member, 10 ... Concave lens as a translucent member, 11 ... Transparent fluid, 12 ... Valve body, 13 ... Multifocal concave lens as a translucent member, 15 ... Special concave lens as translucent member, 16 ... Convex lens as translucent member, 17 ... Display unit, 18 ... Concave mirror as reflective member, 18a ... Mirror surface, 19 ... Insertion hole, 20 ...
A transparent lens as a translucent member, 21 ... Display rod, I ... Display device, S ... Case.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuro Aida, Inayama City, Aichi Prefecture, 1st small upper needle, Energy Support Co., Ltd. (72) Inventor, Ryoji Nagae 1, Inayama City, Aichi Prefectural upper needle, Energy Support Co., Ltd. ( 72) Inventor Yasumi Toyoda, Inayama City, Aichi Prefecture, Kogami Needle 1, Energy Support Co., Ltd.

Claims (3)

[Claims] 1. A valve body which stores fluid in a case and is connected to an operating member is provided in the fluid, and when an overcurrent is detected, the valve body is pulled up through the operating member to display an overcurrent passage indication. In the overcurrent passage display device in which the valve body is delayed and lowered by its own weight to return to the normal display state after the overcurrent is eliminated, a light transmissive member having a light diverging action is provided to the bottom of the case, and An overcurrent passing display device characterized in that the inner surface side and the valve body are provided with different display colors, and a transparent fluid is used as the fluid. 2. A valve body, which stores fluid in a case and is connected to an operating member, is arranged in the fluid. When an overcurrent is detected, the valve body is pulled up via the operating member to display an overcurrent passage indication. In the overcurrent passage display device in which the valve body is delayed and lowered by its own weight after the overcurrent is eliminated to return to the normal display state, a light transmissive member having a light converging action is provided on the bottom of the case, and the valve body is provided. An overcurrent passing display device characterized in that a display portion having a display color different from that of the valve body is provided corresponding to the focal point of the translucent member, and a transparent fluid is used as the fluid. 3. A valve body which stores fluid in a case and is connected to an operating member is provided in the fluid. When an overcurrent is detected, the valve body is pulled up via the operating member to display an overcurrent passage indication. In the overcurrent passage display device in which the valve body is delayed and lowered by its own weight to return to the normal display state after the overcurrent is eliminated, the lower part of the case bottom is covered with a light transmissive member to have a light converging action. In addition to providing the reflecting member, the valve body is provided with a display rod that penetrates the reflecting member in the normal display state and projects toward the translucent member, and is provided with a display color different from the reflecting surface of the reflecting member. An overcurrent display device characterized in that a transparent fluid is used for the display.