JP2003279399A - Weight sensor for seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weight sensor for a seat at a low cost which is superior in durability, can measure accurately weight of a crew sitting on a seat and is easy to be fixed to the seat. <P>SOLUTION: A spring member is interposed between the sensor and a main member to which the weight of the crew sitting on the seat is applied. A sensor element is arranged on a seat frame retaining the main member and has a rotating shaft. A resistance value of the sensor element changes corresponding to rotation of the shaft. One end of a linkage member is fixed to the rotating shaft of the sensor element, and the other end is put on the main member. The weight sensor for a seat consists of the sensor element and the linkage member, and the sensor element measures displacement of the main member, thereby measuring the weight of the crew. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat weight sensor for measuring the weight of an occupant seated on a vehicle seat such as an automobile.

[0002]

2. Description of the Related Art As a seat weight sensor for measuring the weight of an occupant seated on a vehicle seat, there are mat type, strain gauge type or bladder type seat weight sensors. However, a mat-type seat that measures the weight of an occupant seated on a seat cushion by forming a plurality of pressure sensors on a plastic film and installing multiple pressure sensors between the skin of the seat cushion and the cushion pad. In the weight sensor for use in the cushion pad, due to the difference in the surface hardness of each part of the cushion pad, the change in hardness due to the change in ambient temperature, or the change in the hardness of part of the cushion pad due to changes over time, the sensor provided in the hardened part may have other parts. It is undeniable that a larger weight may act, and difficulty may occur in accurate weight measurement.

In a strain gauge type seat weight sensor for measuring the weight of an occupant seated by the strain of a metal component provided between a seat seat portion and a vehicle body, the metal component is the metal component of the occupant in the event of an automobile collision. It is necessary to withstand several tons of load to ensure safety. Therefore, when using a strain gauge type weight sensor for seats that measures the amount of deformation of metal parts, there is undeniably a decrease in accuracy in accurately measuring the weight of an occupant of several tens of kilograms, and the amount of metal deformation is detected. It is difficult to attach a strain gauge, which increases the cost.

By filling a highly flexible resin film or the like with a highly fluid silicone resin or the like, placing the bag on a cushion pad, and detecting the pressure of the resin or the like in the bag with a sensor, In a bladder type seat weight sensor for measuring the weight of a seated occupant, a change in fluidity of the silicone resin or the like caused by a change in ambient temperature or a change over time, or a change in elasticity of a resin film or the like forming the bag, There is an undeniable decrease in the accuracy of pressure detection of the silicone resin filled inside. Moreover, since a bag made of a resin film or the like is used, it cannot be denied that there is room for improvement in durability.

In order to solve the problems of the various weight sensors for seats described above, and to provide a weight sensor for seats that accurately measures weight without being affected by changes with time of the seats and the members constituting the sensors, for example, Japanese Patent Laid-Open No. 2001-18
As disclosed in Japanese Patent No. 0353, one end of a spring is connected to a load sensor provided on a side portion in a seat frame, and the other end of the spring is hung over a main member on which a seat cushion is placed, It is proposed that the load sensor measures the weight of an occupant seated on a seat.

[0006]

However, one end of the spring is connected to the load sensor provided inside the side portion of the seat frame, and the other end of the spring is stretched over the main member on which the seat cushion is placed. When measuring the weight of the occupant seated on the seat with the load sensor, the load sensor supports the weight of the occupant seated on the seat, and a large load is applied to the load sensor itself. It must be attached to the seat frame with a structure that can withstand it, and cost and durability problems cannot be avoided.

The present invention has been made in order to solve the above-mentioned problems and is excellent in durability and capable of accurately measuring the weight of an occupant seated on a seat and mounting it on a seat frame. An object is to provide a simple and inexpensive weight sensor for a seat.

[0008]

In order to achieve the above object, according to the present invention, in claim 1, a spring member is interposed between a main member to which the weight of an occupant sitting on the seat is added, and A sensor element having a rotary shaft arranged on a seat frame supporting the main member and having a resistance value that changes in accordance with the rotation of the rotary shaft, and one end of the sensor element is attached to the rotary shaft and the other end is Provided is a weight sensor for a seat, which is provided with a connecting member that is stretched around a main member.

In the seat weight sensor constructed as described above, the spring member interposed between the seat frame and the main member supports the weight of the occupant seated on the seat, so that the weight acts on the main frame. And, on the rotation axis of the sensor element attached to the seat frame,
A connecting member is attached to the main member. Then, the seat weight sensor can measure the occupant's weight by converting the linear displacement of the main member, which is lowered by the weight, into the rotational displacement of the rotation axis of the sensor element.

Therefore, the seat weight sensor is
Since the weight of the occupant does not act directly, it has excellent durability, and it is possible to accurately measure the weight by converting the linear displacement of the main member that acts and descends into the rotational displacement of the rotation axis of the sensor element. The sensor element is attached to the seat frame, and the connecting member is simply bridged between the main member and the rotary shaft of the sensor element, so that the attachment to the seat frame is completed easily and the sensor element and the connecting member have a simple structure. Therefore, the cost can be reduced.

According to a second aspect of the present invention, the connecting member includes a connecting member main body, a connecting shaft that is erected on one end side of the connecting member main body, and has one end connected to a rotation shaft of the sensor element, and the connecting member main body. And a hook portion having a long hole shape provided on the other end side of the. Therefore, the hook portion having the long hole shape can be easily hung on the main member, and the main member can move inside the hook portion having the long hole shape, so that the main member descends with the weight of the occupant. It is possible to transmit the linear displacement to the rotation axis of the sensor element as a rotational displacement. Further, the connecting shaft of the connecting member may be connected to the rotating shaft of the sensor element.

According to a third aspect of the present invention, the sensor element is attached to one end of the spring member that is stretched between the main member and a side portion of the seat frame to support the main member on the seat frame. It is arranged below the position of the side of the frame sheet. In the seat weight sensor thus arranged, the sensor element and the connecting member forming the seat weight sensor are located below the main member and the seat cushion placed on the main member and the seat cushion. Since there is no interference, accurate weight measurement is possible.

According to a fourth aspect of the present invention, one end of the connecting member is wound around the rotary shaft of the sensor element, and the other end of the connecting member is wound around the main member. The seat weight sensor thus configured can measure the occupant's weight by converting the linear displacement of the main member lowered by the weight into the rotational displacement of the rotation shaft of the sensor element by the connecting member.

According to a fifth aspect of the present invention, one end of the wire is wound around a winder provided on the rotary shaft of the sensor element, and the other end of the wire is hung over the main member to form the sensor element and the main member. And are connected. With the seat weight sensor configured in this way,
Attaching the weight sensor for a seat to the seat frame by a simple work such as attaching the sensor element to the seat frame and hanging the other end of the wire wound around the winder of the rotary shaft of the sensor element to the main member. Can be completed, and the cost can be reduced because of the simple structure such as the sensor element, the winder, and the wire.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat weight sensor according to an embodiment of the present invention will be described below with reference to the drawings. Figure 1
1A is an external view of a vehicle seat 1, and FIG. 1B is an exploded perspective view showing a schematic main configuration of a seat 2 of the vehicle seat 1. The seat seat portion 2 includes a seat cushion 3, a main member 4 on which the seat cushion 3 is placed, and a plurality of spring members 6 that support the main member 4 inside the seat frame 5. The seat frame 5 has four wall portions (side portions) that rise from the four sides of the substantially rectangular seat frame bottom surface member that forms the bottom surface. The main member 4 includes, for example, two side bars 4a arranged in parallel to the inside of the side section 5a of the seat frame 5, and, for example, six connecting bars 4b connecting between the two side bars 4a. It consists of and.

FIG. 2 is a plan view showing a state in which the seat weight sensor 7 is attached to the seat frame 5 (FIG. 2).
(A)) and XX sectional drawing of the seat frame 5 (FIG. 2).
(B)). The seat weight sensor 7 includes the side portions 5 a of the seat frame 5 and the side bars 4 of the main member 4.
For example, two pieces each, a total of four pieces, are attached to a and a. Specifically, the sensor element 8 forming the seat weight sensor 7 includes two side portions 5 of the seat frame 5.
A hook member (coupling member) 9 that is also attached to each of the seat weight sensors 7 a is attached to the rotary shaft of the sensor element 8, and the other end of the hook member 9 is attached to the main member 4. It is hung on the side bar 4a.

As shown in FIG. 3A, the sensor element 8 is composed of a variable resistor having a resistor as shown in FIG. 4 inside an envelope 8a having a substantially rectangular parallelepiped shape, and at the substantially center thereof. Is provided with a rotating shaft 8b. Inside the envelope 8a,
As shown in FIG. 4, two resistors 8r and 8s that circulate around the central axis of the rotating shaft 8b are formed on a substrate 8t made of, for example, a glass epoxy resin laminated plate or a ceramic substrate. Both ends of the outer resistor 8r are connected to the lead portions 8u and 8v, and the inner resistor 8s formed in a ring shape is partially connected to the lead portion 8w. The lead portions are arranged in the order of 8u, 8w, and 8v. Rotating shaft 8b
The slider 8x interlocked with is electrically connected to the outer resistor 8r and the inner resistor 8s. Therefore, the resistance value between the lead portions 8u and 8w, and the lead portions 8v and 8w.
The resistance value between them changes according to the rotation of the rotating shaft 8b.

As shown in FIG. 3 (a), the side surface 8d of the envelope 8a parallel to the rotating shaft 8b has a T-shaped projection 8e for attaching to the seat frame 5. The bottom portion is formed by connecting to the side surface 8d. Therefore, two guide grooves 8f are formed between the upper portion of the T-shape of the protrusion 8e and the side surface 8d. Here, the protrusion 8e is not formed on the upper portion of the side surface 8d, and the lock portion 8g is formed so as to protrude at a portion of the side surface 8d located above the guide portion 8f. Lock part 8
The upper surface of g forms a plane substantially orthogonal to the side surface 8d, and when the lock portion 8g is viewed in the axial direction of the rotating shaft 8b, the thickness of the lower portion of the lock portion 8g is reduced to form a substantially semicircular shape.

Incidentally, the side portion 5a of the seat frame 5 is provided with a guide groove 5b which is cut out in a rectangular shape from the upper end of the side portion 5a downward. Then, the sensor element 8 can be easily attached to the side portion 5a by inserting the side portion 5a located in the peripheral portion of the guide groove 5b into the two guide portions 8f of the sensor element 8. As shown in FIG. 5, when the sensor element 8 is inserted to a position where the lower end of the protrusion 8e of the sensor element 8 abuts on the bottom 5c of the guide groove 5b, the lock portion 8g causes the side portion 5 of the seat frame 5 to move.
The sensor element 8 is fitted into the lock hole 5d provided on the side a, and the attachment of the sensor element 8 to the side portion 5a is completed. After the attachment is completed, the lock hole 5d prevents the lock portion 8g from rising, so that the sensor element 8 is hard to come off from the side portion 5a.

Thus, the sensor element 8 attached to the side portion 5a is positioned so that one end of the spring member 6 is located below the position attached to the side portion 5a as shown in FIG. 2 (b). As shown in (a), a guide groove 5b is provided. As shown in FIGS. 3 (a), 3 (b) and 3 (c), the hook member 9 is erected on, for example, a substantially rectangular hook body (connecting member body) 9a having semicircular ends and one end side of the hook body 9a. And the connected connecting shaft 9b.

The hook body 9a is provided with an elongated hole 9c extending from the other end side to the one end side, and the elongated hole 9c is provided at a portion near the one end side of the hook body 9a from the central portion of the hook body 9a.
And the opening 9d that is open to the side of the hook body 9a communicate with each other to form a hook 9e. Here, the width of the slot 9c is slightly larger than the diameter of the side bar 4a. Therefore, the side bar 4a of the main member 4 is passed through the opening 9d,
Further, when the side bar 4a is loosely inserted into the elongated hole 9c, the side bar 4a can freely move inside the elongated hole 9c of the hook 9e. In this way, the hook member 9 is hung on the side bar 4a of the main member 4.

The rotary shaft 8b of the sensor element 8 has a cylindrical shape, and a convex portion 8c having a substantially triangular cross section is provided on the inner peripheral surface of the rotary shaft 8b, with the apex of the triangle serving as the central axis of the rotary shaft. Two are formed facing each other. On the other hand, the connecting shaft 9b of the hook member 9 has a cylindrical shape, and two grooves 9g having a substantially fan-shaped cross section are formed on the circumferential surface of the connecting shaft 9b from one end 9f of the connecting shaft 9b toward the hook body 9a. Is provided in the axial direction. The outer diameter of the connecting shaft 9b is slightly smaller than the inner diameter of the rotating shaft 8b of the sensor element 8 and has an outer diameter suitable for being inserted into the inner peripheral surface of the rotating shaft 8b. ing. The insertion is performed so that the convex portion 8c of the rotating shaft 8b is fitted into the groove 9g of the connecting shaft 9b. Thus, the connecting shaft 9b can be easily connected to the rotating shaft 8b, and the rotating motion of the hook member 9 causes the connecting shaft 9b and the rotating shaft 8b to rotate integrally.

Thus, the seat weight sensor 7 including the sensor element 8 and the hook member 9 can be easily attached to the seat frame and the main member. Next, FIG. 6 is a schematic diagram showing how the occupant sits on the seat cushion 3 placed on the main member 4. When the occupant is seated, the weight of the occupant acts on the seat cushion 3 in the direction indicated by the arrow A, and the main member 4 is displaced by the weight and descends. On the other hand, the spring member 6 extends to support the weight. Thus, the weight is determined by the side portion 5a of the seat frame 5.
However, the weight does not act on the sensor element 8.

Due to the displacement of the main member 4, the hook member 9 is rotationally displaced about the rotation axis 8b of the sensor element 8. When the occupant is not seated, FIG.
As shown in (a), the side bar 4a of the main member 4
The other end of the hook member 9 hung over the sensor element 8 is
Is located above the rotary shaft 8b. When the passenger is seated, as shown in FIG. 7B, the main member 4
Is displaced downward, so that the other end side of the hook member 9 hung on the side bar 4a is also displaced downward. At this time, the distance between the side bar 4a and the rotating shaft 8b of the sensor element 8 changes.
It is absorbed by displacing the inside of the long hole 9c toward the connecting shaft 9b as shown by an arrow B.

Then, the main member 4 is displaced by the weight of the occupant seated on the seat cushion 3, and with this displacement, the connecting shaft 9b of the hook member 9 and the rotary shaft 8b of the sensor element 8 are integrated. Due to the rotational displacement, the resistance values between the lead portions 8u and 8w and between the lead portions 8v and 8w of the sensor element 8 change. The seat weight sensors 7 thus attached to the four positions on the side of the seat frame 5 measure the displacements of the main member 4 at the four positions.
Since the sum of the displacements at these four locations is proportional to the weight of the seated occupant, the weight of the occupant can be accurately measured by measuring and summing the resistance value changes of the sensor elements 8 of the seat weight sensors 7.

For example, four sensor elements 8 may be connected in series to measure the change in the series resistance value, or the resistance value changes of the four sensor elements 8 may be measured, respectively, and then the measured values may be measured. You may add by addition means. Next, a modified example of the main member 4 is shown in FIG. Similar to the main member 4, the main member 14 connects, for example, two side bars 14a that are provided in parallel and form two side parts, and that connects the two side bars 14a. It is composed of six connecting bars 14b. Then, each side bar 14a is provided with two hook-hanging portions 14c. The hook-hanging portion 14c having a substantially U shape has a side bar 1 on the open side of the U shape.
4a, and is attached to the lower side of the side bar 14a. Therefore, the hook hanging portion 14c
The lower bar 14d is located below the side bar 14a.

FIG. 8B shows the weight sensor 7 for the seat, on which the hook member 9 is hooked on the hook hooking portion 14c of the main member 14. In this case, the side bar 14
Since the hook member 9 is bridged over the lower bar 14d of the hook bridge 14c located below a, the position of the seat weight sensor 7 can be lowered. Then, as shown in FIG. 7C, the main member 1
Even if 4 is displaced downward by the weight of the occupant and the other end of the hook member 9 is displaced downward from the rotation shaft 8b of the sensor element 8,
Since the interference between the seat weight sensor 7 and the seat cushion 3 can be avoided more reliably, more accurate weight measurement can be performed.

FIG. 9 shows a modification of the sensor element. Figure 9
The envelope 18a of the sensor element 18 shown in (1) is also a variable resistor having a substantially rectangular parallelepiped shape and having a rotating shaft 18b at the substantially central portion thereof. On a side surface 18d parallel to the rotation shaft 18b, a substantially T-shaped projection 18e is formed by connecting the bottom portion of the T shape over the entire surface of the side surface 18d for attachment to the seat frame 5. Therefore, the protrusion 18e
Two guide parts 18 between the upper part of the T-shape and the side surface 18d.
f is formed.

As shown in FIG. 10, the side portion 5a of the seat frame 5 is provided with the guide groove 5b as described above. On both sides of the guide groove 5b, the sensor hooks 5e are provided.
Is provided. The sensor retaining portion 5e has a substantially rectangular shape, is punched out from the side portion 5a except for one side of the upper portion of the substantially rectangular shape, and is slightly bent downward toward the inner side of the seat frame 5 to project.

Then, the sensor element 18 can be easily attached to the side portion 5a of the seat frame 5 by inserting the peripheral portion of the guide groove 5b into the two guide portions 18f of the sensor element 18. When the sensor element 18 is inserted to the position where the lower end of the protrusion 18e contacts the bottom 5c of the guide groove 5b, the lower portion of the sensor latching portion 5e becomes
It comes into contact with the upper surface of the sensor element 18,
The sensor element 18 does not easily come off from the guide groove 5b, and the attachment to the side portion 5a of the seat frame 5 is completed.

Thus, the rotating shaft 18b of the sensor element 18
By connecting to the connecting shaft 9b of the hook member 9, the weight sensor for a seat including the sensor element 18 and the hook member 9 can be easily attached to the seat frame. Next, FIG. 11 shows a modification of the connecting member. In the sheet weight sensor 27 shown in FIG. 11, a winder 29 is provided on the rotary shaft 28b of the sensor element 28, and the sensor element 28 is connected to the main member 4 by a wire 30 (coupling member) wound around the winder 29. It is characterized by connecting to.

The envelope 28a of the sensor element 28 is also a variable resistor having a substantially rectangular parallelepiped shape similar to the sensor element 8 and having a rotating shaft 28b in the substantially central portion thereof, which is a cylindrical rotating shaft 28.
A convex portion 28c is provided on the inner peripheral surface of b, and the lead portion 28 corresponding to the lead portions 8u, 8w, and 8v of the sensor element 8 is provided.
u, 28w and 28v. However, inside the sensor element 28, a return spring (not shown) is provided to bias the rotating shaft 28b so that the winder 29 attached to the rotating shaft 28b winds the wire 30.

The winder 29 is mainly composed of a substantially disk-shaped winding cylinder 29a and a connecting shaft 29b provided upright in the center thereof. The connecting shaft 29b is the connecting shaft 9b of the hook member 9 described above.
It has a columnar shape like the above, and has two grooves 29c having a substantially fan-shaped cross section. It is easy to fit these grooves 29c into the convex portion 28c provided on the rotation shaft 28b of the sensor element 28. The winder 29 is attached to the rotary shaft 2 of the sensor element 28.
It can be connected to 8b.

As shown in FIGS. 12 (a) to 12 (c), the winder 29 has a winding groove 29d provided on the circumferential surface of the winding drum 29a for winding the wire 30. Connecting shaft 29b
On the end surface 29e of the winding drum 29a facing the side where the
A substantially circular hooking portion 29f is provided so as to communicate with the winding groove 29d. The hook 29f has a slit 29
It communicates with the peripheral surface of the winding drum 20a at g. Also, the winding groove 2
A hook recess 29h, which is recessed in a substantially hemispherical shape, is formed on the side facing the hook 29f across 9d. Note that FIG.
2B is a cross-sectional view of Y1-Y1 of the winding cylinder 29a shown in FIG. 4A, and FIG. 2C is a cross-sectional view of Y2-Y2.

The wire 30 has a spherical first metal fitting 30a at one end and a similar second metal fitting 30b at the other end. The first terminal fitting 30a is slightly smaller than the inner diameter of the hooking portion 29f of the winder 29, and has a diameter that allows it to be fitted into the hooking recess 29h. Terminal fittings 30
It is possible to easily hook a on the hooking portion 29f and the hooking recess 29h.

On the other hand, the second terminal fitting 30b of the wire 30
The wire hooking member 31 for hooking the wire is shown in FIG.
As shown in (b), it is made of, for example, a substantially rectangular plate-shaped member, one end side 31a of which is connected to the side bar 4a of the main member 4, and the other end side 31b is bent in a U shape. A substantially circular hooking portion 31d having an inner diameter slightly larger than the diameter of the second terminal fitting 30b of the wire 30 is provided at a position closer to the one end side 31a from the U-shaped bent bottom portion 31c. A slit 31e is provided between the U-shaped bent bottom portion 31c. This slit 31
The sensor element 28 is simply operated by passing the wire 30 through e and hooking the second terminal fitting 30b on the hooking portion 31d.
The wire 30 can be hung between the main member 4 and the main member 4.

When the sensor element 28 and the main member 4 are connected in this way, one end of the wire 30 is wound around the winding groove 29d of the winder 29 by the tension of the return spring that biases the rotating shaft 28b. At the same time, it is stretched between the main member 4 and the winder 29. The seat weight sensor 27 is shown in FIG.
As shown in (a) and (b), when attached to the seat frame 5, the wire 30 pulled by the main member 4 which is displaced downward by the weight of the occupant is connected to the rotary shaft 28b of the sensor element 28. The container 29 is rotationally displaced. In this way, the resistance values between the lead portions 28u and 28w and between the lead portions 28v and 28w of the sensor element 28 change according to the weight of the occupant, and the weight of the occupant can be measured similarly to the seat weight sensor 7. it can. Note that FIG. 14B is a ZZ sectional view of FIG.

When the wire is used as the connecting member as described above, the weight sensor for a sheet can be constructed so that the wire is directly attached to the rotary shaft of the sensor element and wound up without using a winder. It is also possible to form the catcher integrally with the rotary shaft of the sensor element. It is also possible to hook the wire on the main member by providing a hook, for example, in the shape of a hook at the end of the wire.

The present invention is not limited to the above-described embodiment, and various modifications can be carried out without departing from the spirit of the present invention.

[0040]

As described above, according to the seat weight sensor of the present invention, since the weight of the occupant seated on the seat is supported by the spring member suspended between the main member and the seat frame, Since the weight does not directly act on the sensor element, it has excellent durability, and since the sensor element can accurately measure the downward displacement of the main member, it has the effect that the weight of the occupant seated on the seat can be accurately measured. Since the weight sensor for vehicle has a simple structure including the sensor element and the connecting member, it is possible to reduce the cost, and it is possible to easily attach these structural elements to the seat frame and the main member.

[Brief description of drawings]

FIG. 1 is a diagram showing an outer appearance of a vehicle seat and a schematic main configuration of a seat portion thereof.

FIG. 2 is a plan view showing a state in which a seat weight sensor according to the present invention is attached to a seat frame and a sectional view of the seat frame.

FIG. 3 is a view showing a schematic configuration of a main part of a sensor element and a hook member that form the weight sensor for a seat in FIG. 2, and a side portion of a seat frame to which the sensor element is attached.

FIG. 4 is a diagram showing a schematic configuration of a main part of an internal structure of the sensor element of FIG.

5 is a diagram showing a state where the sensor element of FIG. 3 is attached to a side portion of a seat frame.

FIG. 6 is a schematic view showing how an occupant sits on a seat cushion placed on a main member.

FIG. 7 is a diagram showing a manner in which a rotation shaft of a sensor element is rotated by a hook member that is hung on a main member.

FIG. 8 is a diagram showing a modification of the main member.

FIG. 9 is a diagram showing a modification of the sensor element.

10 is a diagram showing a state where the sensor element of FIG. 9 is attached to a side portion of a seat frame.

FIG. 11 is a diagram showing a schematic configuration of a main part of a weight sensor for a seat including a connecting member of a modified example.

12 is a diagram showing a schematic configuration of a main part of a connecting member of the sheet weight sensor of FIG. 11 and a winder winding the same.

FIG. 13 is a diagram showing a schematic configuration of a main part of a hooking member for hanging the wire of FIG. 11 on a main member.

14 is a diagram showing a state where the seat weight sensor of FIG. 11 is attached to a side portion of a seat frame.

[Explanation of symbols]

1 Car seat 4, 14 Main members 4a, 14a Side bar 5 seat frame 5a Side of seat frame 6 Spring member 7,27 seat weight sensor 8, 18, 28 Sensor element 9 Hook member (connecting member) 9a Hook body (connecting member body) 9b Connection shaft 9c long hole 9e Hook 29 Winder 30 wire (connecting member)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takayuki Morikawa             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. (72) Inventor Takashi Takeshita             3-10 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa             Within Japan Spring Co., Ltd. (72) Inventor Hiroshi Matsunaga             3-10 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa             Within Japan Spring Co., Ltd.

Claims (5)

[Claims] 1. A seat member for supporting the main member, wherein a spring member is interposed between the seat member and a main member to which the weight of an occupant seated on the seat is added, and the seat member is provided with a rotating shaft. A weight sensor for a seat, comprising: a sensor element having a resistance value that changes according to the above; and a connecting member whose one end is attached to a rotary shaft of the sensor element and whose other end is hung on the main member. . 2. The connecting member includes a connecting member main body, a connecting shaft that is erected on one end side of the connecting member main body, and has one end connected to a rotation shaft of the sensor element, and the other end of the connecting member main body. The seat weight sensor according to claim 1, further comprising: a hook portion having a long hole shape provided on the side. 3. The frame seat side to which the sensor element is attached between the main member and a side portion of the seat frame, and one end of the spring member for supporting the main member on the seat frame is attached. The weight sensor for a seat according to claim 1, wherein the weight sensor is arranged below a position of the portion. 4. The weight sensor for a seat, wherein one end of the connecting member is wound around a rotation shaft of the sensor element, and the other end is stretched over the main member. 5. The weight sensor for a sheet according to claim 4, further comprising a winder that winds the connecting member around a rotation shaft of the sensor element.