JPH10221155A - Weight-detecting apparatus and oil amount sensor using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a weight detection apparatus relatively simply and inexpensively which is utilized for a sensor detecting the amount of an oil such as a fuel of a kerosene stove or a kerosene fan heater or the like. SOLUTION: A load part 8c of a leaf spring material which elastically moves vertically in accordance with a loaded weight, and a plunger 13 movable horizontally are butted and interlocked. A vertical movement of the load part 8c is converted to a horizontal movement of the plunger 13 via an inclined butted face 13a. The horizontal movement of the plunger 13 is amplified via a swingable lever 15, transmitted to a brush 18 of an output means 22, whereby the up-down movement of the load part 8c is converted to an electric signal and output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight detecting device suitable for detecting the remaining amount of fuel in an oil fan heater or an oil stove, and an oil amount sensor using the same.

[0002]

2. Description of the Related Art Conventionally, as an oil amount sensor in an oil fan heater, the weight of a cartridge tank is converted into a change in oscillation frequency based on a change in capacitance between two electrodes and detected. There is known a configuration in which the remaining amount is displayed by an LED or the like on the basis of the information.

FIG. 24 is a schematic diagram for explaining the detection principle of such a capacitance type oil amount sensor, and FIG.
Indicates a state in which the fuel is low, and FIG. 3B shows a state in which the fuel is full.

The weight of the cartridge tank 31 is evenly supported by a pair of opposed leaf springs 40a and 40b, and one leaf spring 40b has an electrostatic force having two opposed electrodes 42 and 43. Capacitive sensor 44
The gap between the opposing electrodes 42 and 43 changes according to the weight of the cartridge tank 41, and the change in the capacitance is used. This change in the capacitance is detected by an oscillation circuit (not shown). The change is detected as a change in the oscillation frequency.

[0005]

The above-described conventional oil amount sensor has a complicated structure, it is difficult to adjust a leaf spring for setting a reference, and the cost is high because an electronic circuit such as an oscillation circuit is required. There is a disadvantage.

The present invention has been made in view of the above points, and provides a weight detecting device capable of detecting weight with a relatively simple and inexpensive configuration, and an oil amount sensor using the same. The purpose is to:

[0007]

In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, according to the first aspect of the present invention, there is provided a weight detecting device according to the present invention, wherein the weight mounting member is made of an elastic material which is displaced in accordance with the weight of the weight mounting device and moves in conjunction with the displacement of the weight mounting member. And an output means for providing an output corresponding to the movement of the moving body.

According to a second aspect of the present invention, there is provided a weight detecting device comprising:
2. The invention according to claim 1, wherein the weight placing body is vertically displaced in accordance with the weight, and the moving body is horizontally displaced in accordance with the vertical displacement. The output means changes the sliding resistance value by sliding the brush in accordance with the horizontal movement of the moving body and gives a corresponding output.

According to a third aspect of the present invention, there is provided a weight detecting device comprising:
In the invention according to claim 1 or 2, the moving body is:
It is supported by the case in three contact states.

According to a fourth aspect of the present invention, there is provided a weight detecting device comprising:
The invention according to any one of claims 1 to 3, further comprising an amplification member that amplifies the movement of the moving body and transmits the movement to the output unit.

According to a fifth aspect of the present invention, there is provided a weight detecting device comprising:
In the invention according to claim 4, the amplification member is constituted by a lever which is horizontally swung by contact with the moving body, and a sliding friction reducing member is interposed between a lower surface of the lever and the case. I have.

According to a sixth aspect of the present invention, there is provided a weight detecting device comprising:
In the invention described in claim 5, the sliding friction reducing member is made of a material different from the material of the lever.

According to a seventh aspect of the present invention, there is provided a weight detecting device comprising:
In the invention according to claim 5 or 6, the fulcrum for swingably supporting the lever is configured as an edge-like fulcrum for locking the lever at one point.

The weight detecting device according to the present invention according to claim 8 is
The invention according to any one of claims 1 to 7, wherein the inclined contact surface provided on the movable body is urged against the weight mounting body to follow the vertical displacement of the weight mounting body. The moving body is configured to move in the horizontal direction via the inclined contact surface.

According to a ninth aspect of the present invention, there is provided a weight detecting device comprising:
According to an eighth aspect of the present invention, the inclined contact surface of the moving body is formed of a resin material having low sliding friction.

According to a tenth aspect of the present invention, in the weight detecting device according to the eighth or ninth aspect, a sliding member made of a resin material having low sliding friction is provided at the contact portion of the weight mounting body. Fitted.

According to an eleventh aspect of the present invention, in the weight detection device according to any one of the eighth to tenth aspects, the inclined contact surface of the moving body is in a direction orthogonal to a horizontal moving direction of the moving body. Are formed in a small width.

According to a twelfth aspect of the present invention, in the weight detecting device according to any one of the first to eleventh aspects, an annular outer peripheral support surrounding the mounting portion of the weight mounting body is provided. The mounting portion and the outer peripheral support portion are connected at a plurality of positions in the circumferential direction via vertically elastically deformable arms, and the outer peripheral support portion is fixedly supported on the case.

According to a thirteenth aspect of the present invention, in the weight detecting device according to any one of the first to twelfth aspects, the output means is linear in accordance with a weight placed on the weight placing body. Output.

According to a fourteenth aspect of the present invention, there is provided an oil amount sensor comprising:
The weight detection device according to any one of claims 1 to 13, wherein the weight mounting body receives and supports the weight of a cartridge tank in an oil fan heater or an oil stove.

According to the weight detecting device of the present invention, the weight placing body is displaced in accordance with the weight to be placed, and after this is converted into the movement of the moving body, the moving body is moved by the output means. Will be provided according to the movement of.

According to the weight detecting device of the present invention, the weight placing body is vertically displaced in accordance with the placed weight, and this is converted into a horizontal movement of the moving body.
In the output means, the brush is slid by the horizontal movement to change the sliding resistance, and an output corresponding to the weight is obtained.

According to the third aspect of the present invention, the movable body supported by the case in three contact states can stably move and move with less sliding friction with minimum contact. .

According to the weight detecting device of the present invention, since the minute movement of the moving body can be transmitted to the output means with a large displacement, the output width can be increased.

According to the weight detecting device of the present invention, the lever for amplifying the movement of the moving body swings smoothly with little sliding friction.

According to the weight detecting device of the present invention, the sliding friction when the lever swings can be effectively reduced by making the material for the sliding friction reducing member different from that of the lever.

According to the weight detecting device of the present invention, since the swing lever is locked at the edge-shaped fulcrum,
Regardless of the manufacturing error of the fulcrum shaft and the fulcrum hole, the swing lever always swings at one point, and the lever ratio for amplification is stabilized.

According to the weight detecting device of the present invention, the vertical displacement of the weight placing body can be converted into the horizontal movement of the moving body via the inclined contact surface.

According to the ninth aspect of the present invention, the sliding between the contact portion of the weight placing body and the inclined contact surface is smooth, and the vertical displacement of the weight placing body is controlled by the moving body. It can be smoothly converted to horizontal movement.

According to the weight detecting device of the present invention, the sliding between the contact portion of the weight placing body and the inclined contact surface is further smoothened, and the vertical displacement of the weight placing body is controlled by the moving body. Can be smoothly converted to horizontal movement.

According to the weight detecting device of the present invention, the inclined contact surface always comes into contact with the same position in the contact portion of the weight mounting body, and the vertical displacement of the weight mounting body is reduced. The contact movement characteristic when converting the moving body into the horizontal movement smoothly is stabilized.

According to the twelfth aspect of the present invention, when the weight is applied to the weight placing body, each arm is elastically deformed and the weight placing body moves downward in parallel.

According to the weight detecting apparatus of the present invention, the weight applied to the weight mounting body can be determined without using a special calculation by the output from the output means.

According to the oil amount sensor of the present invention, it is possible to detect and output a decrease in the weight of the cartridge tank due to fuel consumption, and to use this output as a signal for indicating the remaining amount. Can be.

[0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a weight detecting device according to an embodiment of the present invention; FIG.

(Embodiment 1) FIGS. 1 to 10 show a first embodiment of a weight detecting device according to the present invention. FIG. 1 shows the overall appearance of a weight detecting device A, and FIGS. FIG. 3 shows its internal configuration, and FIG. 5 shows its entire cross section.

The case 1 of the weight detecting device A is formed in a flat rectangular box shape in which a cover case 3 is fitted to a resin-molded case body 2 shown in FIG. The case body 2 and the cover case 3 are provided with concentric circular holes 4 and 5, respectively, so that a circular opening penetrating vertically is formed at a position deviated to one side. At a plurality of positions, screw connection portions 6 to a fuel storage container provided in an oil fan heater or an oil stove are formed. The case body 2
And the cover case 3 are connected by the engagement between the locking claw 2a and the locking hole 3a.

On the upper surface of the case body 2, a concave portion 7 is formed over substantially the entire surface, and the circular hole 4 is formed at a position deviated to one lateral side of the concave portion 7. A circular weight mounting body 8 formed by stamping a plate spring material is provided concentrically. The weight mounting body 8 includes an annular outer peripheral support portion 8a, a plurality of arm portions 8b extending in the circumferential direction from the annular outer peripheral support portion 8a, and a mounting portion continuously provided between the free ends of the arm portions 8b. 8c, the outer peripheral support portion 8a is placed over a shallow semicircular step portion 9 formed on the peripheral portion of the concave portion 7 and a partial arc-shaped convex portion 10 projecting from the bottom surface of the concave portion 7. At the same time, a pair of connecting holes 11 formed in the outer peripheral supporting portion 8a are positioned and engaged with the connecting pins 12 projecting from the stepped portion 9, and are caulked and fixed. The placing portion 8c is configured to move vertically and vertically in parallel by elastic deformation of the arm 8b group.

The recess 7 is provided with a plunger 13 as a movable body made of resin or metal and formed in a substantially arcuate shape so as to be horizontally movable in the left-right direction.
As shown in FIG. 5, the upwardly inclined contact surfaces 13a formed at both ends of the plunger 13 are arranged so as to enter below the contact portions 8d projecting in front of and behind the placing portion 8c. , The inclined contact surface 13a is brought into contact with the side edge of the contact portion 8d, and the contact portion 8d is lowered as the contact portion 8d is displaced downward.
The side edge of d and the inclined contact surface 13a are in sliding contact with each other, so that the plunger 13 is pressed and moved in the lateral direction (right direction in the figure).

The entire plunger 13 is formed of a resin material having low sliding friction, for example, a polyacetal resin, or the plunger 13 has an inclined contact surface 13a.
Is coated with a resin material having low sliding friction, and the contact portion 8d of the weight mounting member 8 is coated with a resin material having good sliding properties, so that the vertical movement of the mounting portion 8c can be smoothly performed by the plunger. 13 will be converted to the horizontal movement.

A fulcrum shaft 14 protrudes from the other side (the right side in the figure) of the concave portion 7, and a lever 15 is loosely fitted to the left and right through a fulcrum hole 15c shown in FIG. At the same time, the lever 15 is pivotally urged toward the plunger 13 by the coil spring 16 interposed between the lever 15 and the case side wall, and the protrusion 15 provided on the side of the lever 15 is provided.
a is in contact with the outer peripheral surface of the plunger 13.

The distal end of the lever 15 is formed to be wide, and as shown in FIGS. 8 to 10, a central connecting portion 18a and two right and left contact pieces are formed in a concave groove 17 formed on the upper surface of the wide portion 15b. A brush obtained by integrally punching 18b with 18b is fitted and mounted. A printed circuit board 19 is fixed to the case body 2 by caulking via a pair of connecting pins 20.
Resistor patterns 21a and 21b are formed so that the contact pieces 18b of the brush 18 come into sliding contact with each other.
9 shows a terminal strip 1 on which an input / output conductor pattern is formed.
9a is extended so as to protrude outside the case, and the lever 15
The output means 22 is configured such that the sliding resistance value is changed by the left and right swing and the output voltage is changed.

The lever 15 sets the distance from the fulcrum to the wide portion 15b larger than the distance from the fulcrum to the protrusion 15a, amplifies the minute displacement of the plunger 13 and slides the brush 18. It is configured as an amplification member that converts the displacement.

The weight detecting device A according to the present invention is configured as described above. As shown by the phantom line in FIG. 5, the case 1 is provided with a screw on the upper surface of the fuel storage tank 23 in an oil fan heater or oil stove. The cartridge tank 25 is inserted and loaded into the circular openings 4 and 5 with the cap 26 with the check valve facing downward with the oil filter 24 fitted and mounted on the mounting portion 8c of the weight mounting body 8 while being stopped and fixed, A part of the cap 26 is received and supported by the receiver 8c via the oil filter 24, and the weight of the cartridge tank 24 acts on the receiver 8c.

The mounting portion 8c subjected to the weight is displaced vertically downward and parallel, and this displacement is converted into a horizontal movement of the plunger 13, and the movement is amplified by the lever 15 and transmitted to the output means 22. An output proportional to the weight of the tank 25 is taken out, and this is displayed on a display unit provided on the oil fan heater or the oil stove body using an LED or the like. Then, as the weight of the cartridge tank 25 decreases as the fuel is consumed, the mounting portion 8c of the weight mounting body 8 returns and rises, and the plunger 13 and the lever 15 are displaced following this, and this is output. Means 2
In step 2, the display is activated and displayed. Also, when a certain remaining amount is reached, a notification may be given by a buzzer or the like.

As shown in FIG. 11, the arm 8b connecting the outer peripheral supporting portion 8a and the central mounting portion 8c can be formed as a bent arm as the weight mounting member 8. In this case, the mounting portion 8c can be displaced in parallel only in the vertical direction without causing a planar displacement, and more accurate detection can be performed.

(Embodiment 2) FIG. 12 to FIG.
A second embodiment of the weight detection device of the present invention is shown.
The weight detection device A according to the present embodiment has the same basic configuration and functions as those of the first embodiment.
The same reference numerals are given to members and portions that function in the same way as in the first embodiment, and detailed description thereof is omitted. Configurations different from the first embodiment will be described below.

At a plurality of locations around the circular hole 4 in the main body case 2, oil drain holes 30 are opened to allow oil leaked when the cartridge tank 25 is replaced or the like to flow down to the fuel storage tank 23 below the case. ing.

The cover case 3 is made of a sheet metal material obtained by pressing a metal plate. As shown in FIG. 13, the locking holes 3a of the folded side 3b are formed in the locking claws 2a of the main body case 2. The cover case 3 is configured to engage with the main body case 2 by engaging with the cover case 3.

As shown in FIGS. 14 to 16, a sliding member 31 made of a resin material having good slidability, such as polyacetal resin, is externally attached to the contact portion 8d of the weight mounting body 8. . The sliding member 31 is formed in an inverted U-shape in cross section, and is elastically fitted and engaged with the contact portion 8d from below, so that the raised portion 31a provided on the inner surface of the side is provided.
Is engaged with the concave portion 32 formed on the side edge of the contact portion 8d to prevent the contact portion 8d from coming off to the tip end side. In addition,
In this example, the weight mounting body 8 is screwed onto a step of the case main body 2 via a connection hole 11 provided in the outer peripheral support portion 8a.

As shown in FIG. 18, on the lower surface of a pair of distal ends of the plunger 13 as a moving body, a small elongated projection 13b protruding along the plunger moving direction is protruded, and the lower surface of a rear end corresponding to an arc-shaped top is provided. Are provided with hemispherical small projections 13c, and the entire plunger 13 is
It is supported on the bottom surface of the case main body 2 at three points via the small projections 13b and 13c in a so-called three-point contact state. A plurality of through holes 13 d are formed in the plunger 13, and a plurality of protrusions 10 projecting from the bottom surface of the concave portion 7 in the case body 2 in an arc shape are formed through the through holes 13 d. A part of the outer peripheral support portion 8a of the weight mounting body 8 is mounted and supported on each convex portion 10 upward.

As shown in FIGS. 14 and 17, the inclined contact surfaces 13a provided at both ends of the plunger 13 are formed to have a small width in a direction orthogonal to the direction of plunger movement. Contact pressure is always plunger 1
It acts on a fixed position of the three tip portions.

As shown in FIG. 19, a fulcrum shaft 14 that supports a lever 15 as an amplifying member so as to be able to swing horizontally has a transverse cross section formed in a water droplet shape.
The fulcrum hole 15c is formed in a fan shape having an angle larger than the angle of the sharp portion e of the water drop type fulcrum shaft 14, and the vertex angle f of the fulcrum hole 15c is formed at one point in the sharp portion e of the fulcrum shaft 14. An edge fulcrum to be locked is configured. Here, the sharp portion e of the fulcrum shaft 14 and the vertex f of the fulcrum hole 15c are directed toward the plunger 13, and the lever 15 receiving the pressing force from the plunger 13 is locked at one point on the edge fulcrum. To swing.

As shown in FIGS. 19 and 20,
On the bottom surface of the case body 2 corresponding to the free end side of the lever 15 made of a resin material, a steel wire 33 is engaged and held as a sliding friction reducing member via a groove 34 along the lever moving direction. The wide portion 15b of the lever 15 slides on the steel wire rod 33 with little friction. According to this, since the lever 15 is supported by the steel wire rod 33 in a line contact state, the lever 15 can swing smoothly with little sliding friction, and the linear steel wire rod 33 is not affected by the unevenness of the inner surface of the case. Slide along. Note that the sliding friction reducing member may be made of a hard resin material different from the material of the lever 15. It is also possible to equip the lower surface of the lever 15 with a roller such as a steel ball as a sliding friction reducing member.

The brush 18 engaged in the concave groove 17 formed on the upper surface of the wide portion 15b of the lever 15 has a connecting hole 18c provided in the central connecting portion 18a and a projection provided in the center of the concave groove 17. It is firmly connected by thermal caulking via 35.

(Embodiment 3) FIG. 21 to FIG.
A third embodiment of the weight detection device of the present invention is shown.
This embodiment is characterized in the form of supporting the weight mounting body 8. That is, the weight mounting body 8 radially protrudes three arm portions 8b directly from the annular mounting portion 8c,
The arm portion 8b is configured to be mounted and supported on three mounting seats 36 provided on the case main body. Even if there is a manufacturing error, distortion deformation, or the like on the case main body 2 side, the arm portion 8b is always supported by three points. The weight mounting body 8 can be supported in a stable posture.

A sliding member 31 made of a resin material having low sliding friction is press-fitted from the tip of the contact portion to the contact portion 8d protruding from the placing portion 8c of the weight placing member 8, from the tip of the contact portion. The vertical displacement of the mounting portion 8c is smoothly converted to the horizontal movement of the plunger 13 via the inclined contact surface 13a. At the center of the plunger 13, a mounting seat 3 supporting one arm 8b of the weight mounting body 8 is provided.
A through-hole 13e is formed to penetrate through the hole 6.

The present invention can be embodied in the following modes.

It is also possible to operate the multi-stage switch having a plurality of contacts by the swing displacement of the lever 15 so as to detect the weight stepwise.

If a differential transformer is used for the output means,
The displacement of the plunger 13 can be directly detected and output without the intervention of the lever 15.

If a variation occurs in the elastic coefficient of the arm 8b due to an error in the spring thickness of the weight mounting member 8 or a processing error and the like, a deviation occurs in the characteristic relation between the applied weight and the output, A plurality of types of plungers 13 having different inclination angles of the contact surface 13a may be prepared in advance, and a plunger 13 having a predetermined characteristic relationship may be selected and used.

When the horizontal movement of the plunger 13 is relatively large, the brush 18
It is also possible to attach.

The weight detecting device A can be used not only for oil fan heaters and oil stove oil amount sensors, but also for detecting the remaining amount of various storage tanks whose weight changes.

[0065]

As is clear from the above description, the following effects can be expected according to the present invention.

According to the first aspect of the present invention, since the weight mounting body can be formed by using an elastic material such as a leaf spring material, the weight detecting section can be manufactured with a simple structure and at low cost. . In addition, the output means can be made relatively inexpensive, such as a sliding resistance type or a multi-contact switch type, and can be manufactured at a low cost, thereby simplifying the structure of the entire detector and reducing the cost. Became possible.

According to the second aspect of the present invention, the output means is configured to change the sliding resistance value by sliding the brush in accordance with the movement of the moving body, so that the weight on the moving body can be reduced simply and inexpensively. It can be detected continuously with a simple structure.

According to the third aspect of the present invention, the moving object is
Since the case is supported by point contact, it is less affected by manufacturing errors and molding distortion of the case, and it can be moved horizontally in a stable posture with little sliding friction and effective in stabilizing detection characteristics. Becomes

According to the fourth aspect of the present invention, since the movement of the moving body is mechanically amplified, the output signal width can be made large, and highly accurate detection can be performed.

According to the fifth aspect of the present invention, the lever as the amplifying member can be swung smoothly with little sliding friction, which is effective for stabilizing the detection characteristics.

According to the sixth aspect of the present invention, the sliding friction can be reduced more effectively by using a material different from the lever for the sliding friction reducing member. To further promote.

According to the seventh aspect of the present invention, since the lever serving as the amplifying member is locked and swung at one point by the edge-like fulcrum, the amplification ratio by the lever becomes constant, and highly accurate detection becomes possible.

According to the eighth aspect of the present invention, the vertical displacement of the weight mounting body is taken out as horizontal movement using the inclined contact surface provided on the moving body, so that the displacement can be detected by a vertically compact structure. This makes it possible to form a unit, which is effective for flattening and downsizing of the entire apparatus.

According to the ninth aspect of the present invention, since the inclined contact surface is formed of a resin material having a small sliding friction, the sliding contact between the inclined contact surface and the weight mounting member can be made smooth, and a good contact can be obtained. The displacement detection function can be reliably exerted over a long period of time.

According to the tenth aspect of the present invention, the sliding member having a small sliding friction externally fitted to the contact portion of the weight mounting member acts on the inclined contact surface of the moving body. Sliding contact with the weight mounting body can be made smooth, and a good displacement detection function can be reliably exhibited over a long period of time.

According to the eleventh aspect of the present invention, the inclined contact surface of the moving body is made small to stabilize the contact position with the weight mounting body, so that the moving body always moves from the weight mounting body to the moving body. The contact pressing force will be given at a fixed position,
The vertical displacement of the weight-bearing body can be smoothly and stably converted to the horizontal movement of the moving body, which is effective in stabilizing the detection characteristics.

According to the twelfth aspect of the present invention, the mounting portion can be moved up and down in a stable and parallel manner by the elastic deformation of the arm provided on the peripheral portion. And the displacement detection function can be stabilized. In addition, if the outer peripheral support portion, the arm group, and the mounting portion are integrally formed of a spring plate material, it is more effective for cost reduction.

According to the thirteenth aspect, the detection output can be obtained with a linear characteristic with respect to the weight, so that the calculation of the weight from the output and comparison can be easily performed, and the signal can be easily handled as a signal for display or control. It will be.

According to the fourteenth aspect of the present invention, the weight detecting device of the present invention which does not use a complicated structure can function satisfactorily without failure for a long period of time. The present invention can be effectively used as an oil amount sensor in a petroleum fan heater or a petroleum stove that is stored and left unattended.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a weight detection device according to a first embodiment.

FIG. 2 is an overall perspective view showing the internal structure.

FIG. 3 is an overall plan view showing the internal structure.

FIG. 4 is an enlarged sectional view taken along line aa in FIG. 3;

FIG. 5 is an overall vertical sectional front view.

FIG. 6 is a perspective view of a weight mounting body and a plunger.

FIG. 7 is a perspective view of a case main body.

FIG. 8 is an exploded perspective view showing an output unit.

FIG. 9 is a vertical sectional front view showing a main part of the output means.

FIG. 10 is a perspective view showing a brush of an output unit.

FIG. 11 is a perspective view showing a modification of the weight mounting body.

FIG. 12 is a plan view of the weight detection device according to the second embodiment with a cover case removed.

FIG. 13 is an exploded perspective view of a case.

FIG. 14 is a perspective view of a weight mounting body and a plunger.

FIG. 15 is an exploded perspective view in which a contact portion of the weight mounting body is enlarged.

FIG. 16 is a partially cutaway perspective view in which a contact portion of the weight mounting body is enlarged.

FIG. 17 is an enlarged longitudinal sectional view of a contact portion between the contact portion of the weight mounting body and the plunger.

FIG. 18 is a perspective view of the plunger as viewed from the back side.

FIG. 19 is an exploded perspective view showing an amplification lever and its related parts.

FIG. 20 (a) is a partially cutaway side view showing an output unit. (B) It is a longitudinal section front view showing an important section of output means.

FIG. 21 is a plan view of the weight detection device according to Embodiment 3 with a cover case removed.

FIG. 22 is an expanded longitudinal sectional view of a main part.

FIG. 23 is a perspective view of a weight mounting body and a plunger.

FIG. 24 is a schematic configuration diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 8 Weight mounting body 8a Peripheral supporting part 8b Arm part 8c Mounting part 8d Contact part 13 Plunger (moving body) 13a Inclined contact surface 22 Output means 25 Cartridge tank 31 Sliding member 33 Sliding friction reducing member

Claims (14)

[Claims] 1. A weight-bearing body made of an elastic material that is displaced in accordance with the weight of a placed body, a moving body that moves in conjunction with the displacement of the weight-bearing body, and corresponds to the movement of the moving body. Output means for providing an output. 2. The apparatus according to claim 1, wherein the weight placing body is vertically displaced in accordance with the weight, and the moving body is horizontally displaced in accordance with the vertical displacement. 2. The weight detecting device according to claim 1, wherein the means changes the sliding resistance value and provides a corresponding output by sliding the brush in accordance with the horizontal movement of the moving body. 3. The weight detecting device according to claim 1, wherein the movable body is supported by the case in three contact states. 4. The weight detection device according to claim 1, further comprising an amplification member that amplifies the movement of the moving body and transmits the amplified movement to the output unit. 5. The sliding member according to claim 1, wherein the amplifying member comprises a lever which is horizontally swung by contact with the moving body, and a sliding friction reducing member is interposed between the lower surface of the lever and the case. 5. The weight detection device according to 4. 6. The weight detecting device according to claim 5, wherein the sliding friction reducing member is made of a material different from a material of the lever. 7. The weight detecting device according to claim 5, wherein the fulcrum for swingably supporting the lever is an edge fulcrum for locking the lever at one point. 8. The moving body is provided with a slanting contact surface provided on the moving body for biasing contact with a contact portion of the weight mounting body, and the moving body is tilted following the vertical displacement of the weight mounting body. 8. The weight detection device according to claim 1, wherein the weight detection device is configured to move in a horizontal direction via a contact surface. 9. The weight detecting device according to claim 8, wherein the inclined contact surface of the moving body is formed of a resin material having low sliding friction. 10. The weight detecting device according to claim 8, wherein a sliding member made of a resin material having low sliding friction is externally fitted to the contact portion of the weight mounting body. 11. The weight detecting device according to claim 8, wherein the inclined contact surface of the moving body is formed to have a small width in a direction orthogonal to a horizontal moving direction of the moving body. 12. An annular outer peripheral supporting portion surrounding the mounting portion of the weight mounting body is provided, and the mounting portion and the outer peripheral supporting portion are vertically elastically deformable at a plurality of circumferential positions. The weight detection device according to any one of claims 1 to 11, wherein the weight detection device is connected via an arm, and the outer peripheral support is fixedly supported on the case. 13. The weight detecting device according to claim 1, wherein said output means provides a linear output in accordance with a weight placed on the weight placing body. 14. The oil amount sensor according to claim 1, wherein the weight mounting body of the weight detection device according to claim 1 receives and supports the weight of a cartridge tank in an oil fan heater or an oil stove. .