JP2001242002A - Level gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a level gauge with a simple structure capable of being easily manufactured and assembled, miniaturized, and easily mounted to an LPG container. SOLUTION: In this level gauge 10, a main body 11 comprises a rotating shaft 30 rotatably supported so as not to be displaced in the axial direction and comprising two helical lead parts 30A, a float 35 advancing and retreating along the rotating shaft 30 according to a vertical displacement of liquid level, a magnet 36 provided in the float 35 and associated with the helical lead part 30A to rotationally drive the rotating shaft 30 accompanied by advance and retreat of the float 35, and a liquid level indicating means 23 for indicating a position of the liquid level according to rotation of the rotating shaft 30. The structure thereby becomes simple and manufacture and assembly become easy while miniaturization can be attained, and since the level gauge can be mounted as an integrated body, the level gauge is easily mounted to the LPG container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid level gauge and, more particularly, to a liquid petroleum gas (LP) from a bulk truck.
The present invention relates to an LPG container used in a so-called stationary bulk container system in which G) is directly filled into an LPG container, or to a liquid level gauge for measuring other liquid levels.

[0002]

2. Description of the Related Art As a method of supplying LPG, it is known that a container (cylinder) filled with LPG is carried by truck and delivered to a demand destination such as each home. On the other hand, there is a so-called bulk supply system in which an LPG container set at a demand destination is directly filled with LPG transported by a bulk lorry. This bulk supply system has been widely used for home use and business use, which have a relatively large amount of use, in part because regulations have been relaxed. Such a bulk supply type LPG container is provided with a liquid level gauge for checking that the filling of the LPG by the bulk truck is not excessive.

As a liquid level gauge for an LPG container, for example,
JP-A-10-122937 can be mentioned. In this publication, the movement of the float corresponding to the change in the liquid level in the LPG container is transmitted from a float bar to a float rotation shaft via, for example, a gear transmission mechanism, and the rotation of the rotation shaft is transmitted.
By rotating the rotating shaft on the instrument side by the magnetic force of the magnet provided opposite to the instrument side and the float side,
The measurement is to be performed by turning a scale plate attached to a rotating shaft on the instrument side.

[0004]

However, according to the liquid level gauge disclosed in the above publication, the movement of the float is transmitted from the float bar to the float rotation shaft via a gear transmission mechanism or the like.
Since the structure is complicated and large-scale, the production and assembly are troublesome, and there is a problem that it is difficult to attach to the LPG container.

SUMMARY OF THE INVENTION It is an object of the present invention to simplify manufacturing and assembly with a simple structure, to achieve miniaturization, and to provide an LPG.
An object of the present invention is to provide a liquid level gauge which can be easily attached to a container for use.

[0006]

According to a first aspect of the present invention, there is provided an attachment member to be attached to a member to be attached, and at least one spiral which is supported by the attachment member so as to be non-axially displaceable and rotatable. A rotary shaft on which a reed-shaped lead means is formed, a float which advances and retreats along the rotary axis in accordance with vertical displacement of the liquid surface, and a rotary shaft which is associated with the spiral reed means provided on the float and which advances and retreats the float. And a rotation prevention means provided on the mounting member for preventing rotation of the float, and a liquid surface indication means for engaging with the rotation shaft and indicating a liquid surface position according to the rotation of the rotation shaft. The liquid level gauge is characterized by comprising:

In the present invention, the rotation shaft rotates following the float moving in accordance with the vertical displacement of the liquid surface by the involvement of the participating member and the spiral lead means.
The liquid level indicating means indicates the liquid level position. The float is provided along the rotation axis, the float is provided with a member involved, the helical lead means is formed on the rotation axis, and the rotation prevention means and the liquid level indicating means are also provided integrally with the mounting member. Since it has a structure, it is easy to manufacture and assemble, can be reduced in size, and can be attached integrally, so that attachment to the LPG container becomes easy.

In the present invention, the member to be mounted may be any member as long as it can measure the liquid level of the filling material filled therein, such as a bulk storage tank filled with LPG. LPG container. Further, the spiral lead means may not be one, and may be two or three.
It may be formed with more than one line. The spiral lead means is not limited as long as it can lead the participating members, such as a form in which a magnetic material is spirally formed on the rotating shaft or a form in which a groove is formed in the rotating shaft in a spiral manner. further,
The involvement of the involved member and the spiral lead means is direct (direct connection)
Involvement or indirect involvement may be used, and in the case of indirect involvement, any form of involvement may be used, such as one that utilizes the attractive force of the magnet, that is, the magnetic force, or one that uses gears or other shifting means. The liquid level indicating means may be of any type, such as a mechanical display using a pointer or an electrical display using a rotary encoder or the like.

According to a second aspect of the present invention, in the liquid level gauge according to the first aspect, the spiral lead means is formed of a magnetic material, and the members involved are formed of a magnet. is there.

In the present invention, since the involvement of the helical lead means and the members involved is caused by magnetic force, unlike the mechanical type, it is possible to maintain reliable engagement without failure. Accurate measurement can be performed.

In the present invention, the magnetic material may be provided by forming a spiral groove on the rotating shaft and embedding it in the groove, or a band-shaped magnetic material may be wound around the rotating shaft. Also, as long as the magnet is attracted to the magnetic material and has a magnetic force enough to rotate the rotating shaft as the float moves up and down, regardless of its size and shape, its mounting should also be opposed to the magnetic material. May be attached by gluing,
It may be embedded in the float and attached.

According to a third aspect of the present invention, in the liquid level gauge according to the first or second aspect, a guide means for guiding the advance and retreat of the float is provided between the rotary shaft and the float. It is a feature.

In the present invention, since the float is guided by the guide means, the float is smoothly moved forward and backward, and the float is not stopped and stopped halfway. Measurement results can be maintained.

In the present invention, the guide means may be of any type as long as the float can smoothly advance and retreat, and is preferably provided on the float, but may be provided on the rotating shaft. . For example, a rod-shaped member having a spherical tip may be provided on the float with the tip in contact with the rotation shaft, or a ball may be rotatably provided on the float. In this case, it may be provided at one place near the center in the longitudinal direction of the float, or may be provided at two places at both ends in the longitudinal direction of the float. In each location, it is preferable to be provided at a position opposed by 180 ° in the radial direction, but one may be provided, or three or four equally spaced parts may be provided.

According to a fourth aspect of the present invention, in the liquid level gauge according to the third aspect, the guide means is formed by a plurality of rotatable balls protruding from the float and separated from the upper and lower sides of the float. Characterized in that they are provided at different positions.

In the present invention, since the ball is freely rotatable, the rotating shaft smoothly rotates with the vertical movement of the float, and the ball is provided at a position vertically separated from the float. A stable float guide.

In the present invention, the balls are preferably provided at four positions evenly arranged in the circumferential direction of the float, but may be provided at two or three positions.

According to a fifth aspect of the present invention, in the liquid level gauge according to the first aspect, the helical lead means is formed by a lead groove, and the participating member is formed by a convex portion engaging with the lead groove. It is characterized by the following.

In the present invention, since a spiral groove is formed on the rotating shaft and a convex portion is provided on the float, the structure is smaller than that of the case using a magnetic force using a magnetic material or a magnet. Is simple and the cost is low.

In the present invention, any projection may be used as long as it engages with a spiral lead groove formed on the rotating shaft. For example, the spherical tip of the rod-shaped member may be mounted on the float by protruding the ball, the ball may be rotatably protruded from the float, or a disk-shaped plate having protrusions may be provided on the float. Alternatively, the projection may be engaged with the lead groove of the rotating shaft.

According to a sixth aspect of the present invention, in the liquid level gauge according to any one of the first to fifth aspects, the rotation preventing means is formed integrally with a case covering the periphery of the float, and the length of the float is adjusted. It is characterized by being constituted by a convex portion engaging with a groove formed along the direction.

In the present invention, since the convex portion can be formed at the same time as the case is formed, the production is easy and the rotation of the float can be prevented with a simple structure.

In the present invention, the groove is formed in the radial direction 1 of the float.
It is preferable to form them at two positions opposite to each other by 80 °.
For example, it may be provided at one location, three equal locations, or four locations.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG.
The liquid level gauge 10 according to the embodiment includes a main body 11 that is an attachment member that is attached to the LPG container 1 such as a bulk storage tank that is an attached member by screw connection. This body 11
Two cup-shaped members having different sizes are formed in such a shape that their bottoms are joined together. The smaller one is a screw shaft part 11A, and the larger one is a liquid level indicating means mounting part (hereinafter simply referred to as a mounting part) 11B. ing.

An external thread which is screwed into a female thread formed on the LPG container 1 is cut on the outer periphery of the screw shaft portion 11A, and a concave portion 11 for accommodating the rotary shaft 30 and the like is provided inside.
C is formed. A hexagonal nut 11D is formed on a part of the outer periphery of the mounting portion 11B, and a coupling 12 is mounted inside the mounting portion 11B. , A scale plate 18 and the like are attached.

A part of the coupling 12 is the mounting portion 1.
After being fitted in 1B and being positioned by the positioning pin 13, it is fixed to the mounting portion 11B by a fixing bolt 14 screwed in from the outside of the mounting portion 11B.

On the upper surface of the coupling 12, a mounting plate 15 for closing the concave portion 12A of the coupling 12 is bolted. The mounting plate 15 extends along the axis of the screw shaft 11A of the main body 11. Scale plate mounting shaft 1
6 is rotatably provided via a bearing 17. A scale plate 18 and a pointer 19 are provided at an upper end of the scale plate mounting shaft 16, and a magnet support member 20 is attached to a lower end thereof. The ring-shaped first magnet 21 is bonded to the magnet support member 20. And so on. In addition, on the upper part of such a coupling 12,
For example, a cover 22 having at least a window formed of a transparent member is detachably attached, and thereby the scale plate 18, the pointer 19, the first magnet 21, and the like are protected.

Here, the dial 18 and the pointer 19 are L
The highest position of the liquid level of LPG in the PG container 1;
It is possible to indicate between the lowest position. Also, a mounting plate 15, a scale plate mounting shaft 16,
The liquid level indicating means 23 is configured to include the bearing 17, the scale 18, the pointer 19, the magnet support member 20, and the first magnet 21.

A rotary shaft mounting member 2 formed in a cup shape is provided on the entrance side of the opening of the recess 11C of the screw shaft portion 11A.
5 is fixed by screwing.
The tip of a pipe member 26 of a predetermined length, which is a case inserted into the LPG container 1, is fitted and fixed inside the LPG container. At the rear end of the pipe member 26, a shallow cup-shaped anti-vibration member 27 is provided. A hole 27A is formed at the center of the vibration damping member 27, and a rectangular hole 27B for liquid intrusion is formed in a direction opposite to the radial direction by 180 ° as shown in FIG.

A bearing 28 is mounted on the rotating shaft mounting member 25, and a first support shaft 29 having the same axis as the scale plate mounting shaft 16 is rotatably supported on the bearing 28. . The rotation shaft 30 is attached to the first support shaft 29 by screw connection. A second support shaft 31 is screwed and fixed to the other end of the rotating shaft 30 so as to have the same axis as that of the first support shaft 29.

The rotating shaft 30 is formed of a hollow member such as a non-magnetic material such as aluminum or resin, and its outer periphery is disposed at a position opposite to the radial direction by 180 ° as shown in FIG. , Two lead portions 30A, which are spiral lead means, are formed. This lead part 30
A is formed by embedding a magnetic material in a spiral groove. The spiral of the lead portion 30A has a rotation angle of, for example, 27 degrees of rotation angle from the start point position to the end point position over the entire length of the rotation shaft 30.
So that it falls within the range of about 0 ° to 300 °, that is,
It is formed so as to be within one rotation or less. The surface of the magnetic material of the lead portion 30A is flat.

A pipe-shaped float 35 is provided on the outer periphery of the rotating shaft 30 so as to be movable along the rotating shaft 30. The float 35 is made of Styrofoam or the like, and a rod-shaped magnet 36 as a participating member is provided at a substantially central portion in the length direction. The magnet 36 is embedded at a position 180 ° radially opposite to the float 35 so as to face each other.
It corresponds to the magnetic material of A. The leading end surface of the magnet 36 on the lead portion 30A side is also flat.

The float 35 has a magnet 36
Guide means 37 are provided on both sides in the longitudinal direction with respect to. As shown in FIG. 5, the guide means 37 includes a ball holder 38 that is screwed in the radial direction of the float 35,
A ball 39 is provided rotatably at the tip of the ball holder 38 and is in contact with the rotating shaft 30. Four guide means 37 are provided at each position across the float 35. By adjusting the screwing amount of the ball holder 38, the ball 39 and the rotating shaft 30 are adjusted.
It is possible to adjust the strength of the engagement with. Therefore, the float 35 can move up and down straight along the rotation axis 30.

At the end of the rotating shaft 30, the first support shaft 2
9, a magnet support member 40 is attached, and the support member 40 is sandwiched between a holding portion thereof and a holding plate 42 attached to the support member 40 and fixed by a nut 41. A ring-shaped second magnet 43 is attached. Therefore, the second magnet 43 and the first magnet 21 in the coupling 12 are arranged to face each other.

As shown in FIGS. 4 and 5, the pipe member 26 is provided with rotation preventing means 45 for preventing the float 35 from rotating. That is, the rotation preventing means 45 is constituted by two convex portions 26A formed integrally with the pipe member 26 along the longitudinal direction on the outer periphery of the pipe member 26 and protruding inward, and these convex portions 26A are floated. 35 along the longitudinal direction and the two magnets 3
6 are engaged with two grooves 35A formed at a position orthogonal to the groove 6. Since the pipe member 26 is fixed to the rotating shaft mounting member 25, the float 35 cannot rotate, but can only move along the longitudinal direction.

Next, the mounting and operation of the liquid level gauge 10 will be described. First, the bearing 28, the first support shaft 29, the second magnet 43, and the like are attached to the rotating shaft 30, and the float 35, the pipe member 26, and the like are integrally attached to the main body 11 by the rotating shaft attaching member 25. The liquid level indicator 23 is attached to 11 and the liquid level gauge 10 is assembled.
Then, the liquid level gauge 10 is firmly attached by screwing the screw shaft 11A of the main body 11 into the LPG container 1 and tightening the hexagon nut 11D.

When the interior of the container 1 is not filled with LPG, the float 35 is lowered to the lowest position, and the pointer 19 indicates the position. L by bulk lorry
When the PG is transported and the LPG is directly filled into the container 1 from the bulk lorry, the LPG becomes a pipe member 26.
Penetrates into the pipe member 26 from the square hole 27B of the support member 27 attached to the lower part of the pipe member.

As the LPG enters the pipe member 26 and its liquid level gradually rises, the float 35 moves upward due to buoyancy. The upward movement of the float 35 causes the position of the magnet 36 fixed to the float 35 to move. Due to the change in the position of the magnet 36, the magnet 36 is attracted to the magnet 36 and the lead 30 </ b> A of the rotating shaft 30. Follow the lead portion 30A
Rotate, that is, the rotating shaft 30 rotates.

The rotation of the rotating shaft 30 causes the second magnet 43 provided integrally with the rotating shaft 30 to rotate, and with the rotation of the second magnet 43, the opposing first magnet 21 rotates. Then, the pointer 19 integrally connected to the first magnet 21 rotates a predetermined angle and indicates a predetermined numerical value.

When the liquid level is lowered from a predetermined liquid level position by using the LPG, the float 35 is lowered accordingly. Then, by the operation opposite to the above, the rotation shaft 30
Rotates in the opposite direction, and the pointer 19 also rotates in the opposite direction to indicate the reduced liquid level.

According to the present embodiment, the following effects can be obtained. (1) As the level gauge 10 moves up and down due to the buoyancy of the float 35, the lead portion 30A formed of the magnetic material of the rotating shaft 30 is attracted to the magnet 36 of the float 35, and the rotating shaft 30 rotates. In addition, since the structure is such that the pointer 19 indicates the rotation, the structure is simple,
Compactness can be achieved.

(2) The protrusion 26A of the case 26 for preventing the rotation of the float 35 can be formed at the same time when the case 26 is formed, so that the rotation preventing means 45 can be easily provided.

(3) The guide means 37 are provided on both sides of the magnet 36, and each of the guide means 37 has four balls 3
Since 9 is in contact with the rotating shaft 30, the float 35 can be guided in a well-balanced manner, so that the float 35 can be smoothly advanced and retracted, and the float 35 is not caught and stopped halfway, Thereby, accurate measurement results can be maintained.

(4) The helical lead means and the members involved are formed by the magnetic lead portion 30A of the rotating shaft 30 and the magnet 36 of the float 35, and are formed by magnetic force. It is possible to maintain reliable involvement without causing a failure and to always perform accurate measurement.

(5) The lead 30A of the magnetic material of the rotating shaft 30
Are two, so that the movement of the float 35 can be guided in a better balance than in the case of one. (6) The rotating shaft 3 is supported in a cantilever state by the bearing 28, but the second support shaft 31 is
Is inserted, so it does not shake. Further, the square hole 27B for liquid intrusion formed in the vibration damping member 27 can be formed at the same time when the vibration damping member 27 is formed, and the hole for liquid intrusion can be easily provided.

Next, the second embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. This embodiment and the following third to third embodiments
In the fifth embodiment, the same structures and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted or simplified, and only different portions will be described.
The present embodiment is different from the first embodiment in that a lead means for engaging the float 35 and the rotating shaft 30 is provided by a magnet 36.
And a lead portion 30A in which a magnetic material is embedded, is a lead means that does not use a magnet and a magnetic material.

That is, as shown in FIG.
Has substantially the same shape as the rotating shaft 30 of the first embodiment. The rotary shaft 50 is formed with two spiral lead grooves 50A as lead means. On the other hand, the float 55 is provided with a ball 59 as a participating member.
8, the ball 55 is attached to substantially the center of the float 55 in the longitudinal direction.
Is engaged within. Therefore, as the float 55 moves up and down, the rotating shaft 50 rotates. The ball 59 and the ball holder 58 correspond to the ball 39 and the ball holder 38 of the guide means 37.
Is the same as

According to such a second embodiment,
(1), (2), (6) In addition to obtaining the same effects as (6), (7) Since the ball 59 may be engaged in the lead groove 50A, the lead portion as in the first embodiment The work of embedding the magnetic material in the groove forming the 30A becomes unnecessary, and the labor for forming the lead portion is reduced, and the inside of the lead groove 50A and the ball 59 also serve as the guide means. Even if the guide means 37 is not provided as described above, the float 55 can be moved smoothly, and thus, there is an effect that the number of members can be reduced and manufacturing can be facilitated.

Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment is different from the second embodiment in that
A ball 59 as a participant is attached to the float 55 at substantially the center in the longitudinal direction, and is provided at two places on both ends of the float 55 in the longitudinal direction.

According to such a third embodiment,
The same effects as (1), (2) and (6) can be obtained. (8) Balls 59 are provided at two places on both ends in the longitudinal direction of the float 55.
Is provided, there is an effect that a stable engagement state can be maintained as compared with the third embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. The present embodiment is different from the second and third embodiments in that the lead means is a lead groove and the projection of the involved member is constituted by the ball 59.
The projection is formed on the plate guide 66.

In the present embodiment, as shown in FIG. 9, the first float 65 is divided into two parts in the longitudinal direction.
A, formed of the second float 65B. The floats 65A and 65B are assembled in a nested manner, and the plate guide 66, which is a participating member, is sandwiched between the portions where the floats 65A and 65B are provided. As shown in FIG. 10, the plate guide 66 is formed in a ring shape, and the lead groove 60 </ b> A
A protrusion 66A that fits and engages is formed.
Therefore, when the float 65 moves in the vertical direction, the engagement between the plate guide 66 and the lead groove 60A causes
The rotation shaft 60 will rotate.

According to such a fourth embodiment,
(1) In addition to obtaining the same effects as (2) and (6), (9) the plate guide 66 may be formed by providing a convex portion 66A on an iron plate or the like, and is easily formed by pressing or the like. Therefore, there is an effect that manufacturing is easy.

Next, a fifth embodiment of the present invention will be described with reference to FIG. This embodiment is different from the fourth embodiment in that the plate guide 66 is provided at substantially the center in the longitudinal direction of the float 65, and the plate guide 66 is provided at both ends in the longitudinal direction of the float 75. That is, the float 75 in the present embodiment is formed as a single unit that is not divided, and the plate guides 66 are attached to both ends in the longitudinal direction thereof by bonding or the like.
Are engaged with the lead groove 60 </ b> A of the rotating shaft 60.

According to such a fifth embodiment,
(1) The same effects as (1), (2) and (6) can be obtained. (10) Since the plate guides 66 are provided at both ends in the longitudinal direction of the float 75, the float 75
There is an effect that the movement is small and stable movement can be maintained.

The present invention is not limited to the above embodiments, but may be modified as follows as long as the object of the present invention can be achieved. For example, in the first embodiment, as the lead means, the lead portion 30 in which the magnetic material is embedded in the spiral groove of the rotating shaft 30 is used.
However, the present invention is not limited thereto, and the magnetic body may be formed in a band shape, and the band-shaped magnetic body may be provided on the rotating shaft by bonding or the like.

In the first embodiment, a lead portion 30A is formed as a lead means by embedding a magnetic material in a spiral groove of the rotary shaft 30, and a float 3
5 is provided with the magnet 36, but the invention is not limited thereto. The two may be reversed, that is, a spiral magnet may be provided on the rotating shaft 30 as the lead means, and a magnetic material may be provided on the float 35 as the participating member. Good.

Further, in the first embodiment, four guide means 37 are provided on both sides of the float 35. However, the present invention is not limited to this, and two or three guide means 37 may be provided.

In each of the working liquids, the pointer 19 is formed so as to be directly read. However, the present invention is not limited to this. As shown in FIG. 12, a liquid level meter 10 which can be read out and read as an electric signal. ' According to this figure, a potentiometer 85 is attached to the mounting plate 15.
Alternatively, an encoder is provided, and a signal from the potentiometer 85 is transmitted to a reader via a lead wire 86, and can be read there. FIG.
Is configured based on the first embodiment.

In each of the above embodiments, the rotating shaft 30,
Although 50 and 60 are formed by hollow members, they are not limited to this and may be formed by solid members. However, the use of a hollow member has the effect of reducing the weight of the entire apparatus.

In each of the above embodiments, the pipe member 2
6 is provided with a hole for allowing LPG to penetrate into the pipe member 26.
Although the support member 27 attached to the support member 27 is formed with the square hole 27B, the present invention is not limited to this, and the support member 27 may be formed with a plurality of holes.

In each of the above-described embodiments, the lead portion 30 formed by embedding a magnetic material in the groove is used as the lead means.
A, the lead groove 50A and the lead groove 60A are all formed by two strips, but the present invention is not limited to this.
Etc. may be provided in one, three or more sections.

In the second and third embodiments, the balls 59 are provided on the floats 55 and 65 via the ball holder 58 as the participating members. However, the present invention is not limited to this. Float 5
5, 65 may be provided. In this way, the structure is simple and the manufacture is easy.

[0064]

As described above, the float is provided along the rotation axis, the float is provided with a member involved, the spiral lead means is formed on the rotation axis, the rotation preventing means and the liquid level indicating means. Since it is also provided integrally with the mounting member, it has a simple structure, is easy to manufacture and assemble, can be downsized, and can be mounted integrally, so that it can be easily mounted on the LPG container.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a liquid level gauge according to a first embodiment of the present invention is attached to a container.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG.

FIG. 6 is a longitudinal sectional view showing a state where the liquid level gauge according to the second embodiment of the present invention is attached to a container.

FIG. 7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a longitudinal sectional view showing a state where a liquid level gauge according to a third embodiment of the present invention is attached to a container.

FIG. 9 is a longitudinal sectional view showing a state where a liquid level gauge according to a fourth embodiment of the present invention is attached to a container.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a longitudinal sectional view showing a state where a liquid level gauge according to a fifth embodiment of the present invention is attached to a container.

FIG. 12 is a longitudinal sectional view showing a state where a liquid level gauge according to a modified embodiment of the present invention is attached to a container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 LPG container which is a to-be-attached member 10 Level gauge 11 Main body which is an attachment member 26 Pipe member which is a case 30, 50, 60 Rotating shaft 30A Lead part 35, 55, 65 as a lead means 35 Float 36 Participating member Magnet 37 Guide means 39 Ball 45 Rotation prevention means 59 Ball which is a participating member 66 Plate guide which is a participating member 66A Convex part

Claims (6)

[Claims] 1. A mounting member mounted on a member to be mounted, a rotating shaft supported by the mounting member so as to be non-axially displaceable and rotatable, and having at least one spiral lead means formed thereon, A float that advances and retreats along the rotation axis in accordance with the vertical displacement of the float, and an engagement member that is provided on the float and that participates in the helical lead means and rotationally drives the rotation axis as the float advances and retreats. A rotation prevention unit provided on the mounting member and for preventing rotation of the float; and a liquid surface indication unit for engaging with the rotation shaft and indicating the liquid surface position in accordance with the rotation of the rotation shaft. A liquid level gauge characterized in that: 2. The liquid level gauge according to claim 1, wherein said helical lead means is formed of a magnetic material, and said member is formed of a magnet. 3. The liquid level gauge according to claim 1, wherein a guide means for guiding the float to advance or retreat is provided between the rotation shaft and the float. . 4. The liquid level gauge according to claim 3, wherein said guide means is formed of a plurality of rotatable balls protruding from said float and provided at positions vertically separated from said float. Liquid level gauge characterized by being carried out. 5. The liquid level gauge according to claim 1, wherein said spiral lead means is formed by a lead groove, and said participating member is formed by a convex portion engaging with said lead groove. Liquid level gauge. 6. The liquid level gauge according to claim 1, wherein the rotation preventing means is formed integrally with a case that covers a periphery of the float and extends along a longitudinal direction of the float. A liquid level gauge comprising a convex portion engaging with a formed groove.