Patent Description:
There is a case where a sensor such as a position sensor or the like which detects whether a passenger is seated in a seat is disposed in the seat (see Patent Document <NUM>).

For example, such sensor is used to detect that a passenger is seated in the seat in the seatbelt reminder technique where the passenger is warned when he/she is not wearing the seatbelt although he/she is sitting in the seat.

Patent Document <NUM> discloses a pressure spring type car seat occupancy sensor, where the base is fixedly connected with a pressure-bearing steel plate, and the two ends of the pressure-bearing steel plate have a hook for connecting the seat spring, and a plastic fastener is installed in the hook on the pressure-bearing steel plate to activate a circuit board.

Patent Document <NUM> discloses a pressure spring type car seat occupancy sensor, the lower casing is fixedly connected with the upper part of the bearing steel plate, and the connecting device for connecting with the wire harness of the vehicle body is fixedly connected with the lower casing, and the two ends of the bearing steel plate have a bend for connecting the seat spring.

Patent Document <NUM> discloses a vehicle occupant sensing system adapted for detecting a condition of a vehicle seat assembly that includes at least one emitter and at least one sensor disposed in spaced relationship to the emitter. The vehicle occupant sensing system also includes at least one sensor assembly with a base and an upper slide member slidingly supported for movement toward and away from the base. Also, at least one of the emitter and the sensor is supported by the upper slide member.

Patent Document <NUM> discloses a module for seat occupancy detection of a vehicle seat, which has a carrier element on which a film pressure sensor is placed, the film pressure sensor comprising at least one sensor cell and at least two connecting conductors, each with a contacting end, and with a connecting element arranged on the carrier element. A crimp contact is crimped onto each contacting end of the connecting conductors, the free end of which can be inserted into a corresponding receptacle of the connecting element and can be contacted in the region of this receptacle by a mating contact.

Patent Document <NUM> discloses a seat, such as a car seat, which includes a seat cushion pad having an air passage formed inside and an air vent formed at an upper surface thereof, and is configured to allow air in the air passage to blow out through the air vent, wherein the seat cushion pad includes a pad body and a cover member which is disposed over the pad body to form the air passage between the pad body and the cover member and in which the air vent is formed, and a front end portion of the cover member extends downward over a front end portion of the pad body.

Traditionally, when such sensor is to be disposed in a seat, there is a case where the sensor is to be disposed between the cushion pad and the outer cover of the seat cushion of the seat as described in Patent Document <NUM>, for example.

However, when a sensor is disposed between a cushion pad and an outer cover, that is, if a sensor is disposed right under an outer cover, the sitting comfort may be unpleasant since the passenger who sits in the seat feels something against his/her buttocks and thighs through the outer cover of the seat.

The present invention is made in view of the above problem, and the object of the present invention is to provide a sensor disposition structure in a seat which improves sitting comfort of a passenger when disposing a sensor in a seat.

In order to solve the problem, the invention according to claim <NUM> is a sensor disposition structure in a seat, including:.

Preferably, the attachment bracket is attached in the concave while being engaged with an engaging unit formed in the concave.

Preferably, a nail unit which is formed in a nail shape is formed on the upper surface of the concave as the engaging unit, the nail unit protruding from the upper surface of the concave.

Preferably, a second engaging unit is formed on the upper surface of the concave at a position near the nail unit.

Preferably, the attachment bracket is attached in the concave by the bracket-side engaging unit engaging with an under surface of the board-like member and by the attachment bracket engaging with a nail unit which is formed on an upper surface of the concave so as to protrude therefrom.

Preferably, ribs which respectively support both ends of the attachment bracket are provided on the upper surface of the concave.

Preferably, the attachment bracket includes a guide unit for a harness which electrically connects the sensor and an external device, and the guide unit inclines downward.

Preferably, the concave in which the sensor is disposed is formed at a position avoiding a position right under a hollow section formed in the cushion pad.

A sensor disposition structure in a seat includes a cushion pad and a board-like member which is disposed under the cushion pad, wherein a concave is formed in an upper surface of the board-like member, and a sensor is disposed in the concave. The cushion pad is placed between the buttocks and thighs of the passenger and the sensor. This is different from the above-mentioned traditional case where the sensor is disposed between the cushion pad and the outer cover. The passenger sitting in the seat does not feel the sensor against their buttocks and thighs, and the sitting comfort of the passenger is improved as compared with the traditional case.

If the sensor is simply disposed on the upper surface of the board-like member, the cushion pad will be raised for the height of the sensor, and this can cause discomfort in the passenger who is setting and the sitting comfort may be unpleasant. However, according to the invention of claim <NUM>, since the sensor is disposed in the concave formed on the upper surface of the board-like member, the discomfort as described above is avoided and the sitting comfort is improved.

The sensor is disposed in the concave while being fixed to the attachment bracket. Therefore, the sensor can be easily disposed in the concave since the attachment bracket is attached in the concave after the sensor is fixed to the attachment bracket. Further, when the passenger sits in the seat and the load of the passenger is applied to the sensor via the cushion pad, a part of the load will be absorbed by the attachment bracket. Thus, comparing to the case where the sensor is directly attached in the concave, the influence of the load of the passenger on the sensor becomes small.

The attachment bracket is attached in the concave while being engaged with the engaging unit formed in the concave. Therefore, the attachment bracket can be easily attached in the concave. In addition, the positioning of the attachment bracket can be carried out easily due to the engaging unit, and the attachment bracket will not be easily displaced in the front and rear directions, in the left and right directions and the like.

The nail unit which is formed in a nail shape is formed on the upper surface of the concave as the engaging unit. The nail unit protrudes from the upper surface of the concave. Therefore, mainly the positioning of the attachment bracket in the front and rear directions can be carried out accurately. Further, by confirming that the nail unit protrudes upward from the engaging hole of the attachment bracket when attaching the attachment bracket in the concave, whether the attachment bracket and the nail unit are engaged properly and whether the attachment bracket is disposed at the appropriate position in the concave can be easily confirmed.

The second engaging unit is formed on the upper surface of the concave at a position near the nail unit. Therefore, when attaching the attachment bracket in the concave, the edge section α of the engaging hole of the attachment bracket will be tightly fit between the nail unit and the second engaging unit. Thus, the positioning of the attachment bracket in the front and rear directions can be carried out more accurately and the attachment bracket will not be easily displaced in the front and rear directions.

An opening is formed in the the board-like member, the attachment bracket includes the bent unit which is bent at a position corresponding to the opening, and the attachment bracket includes the bracket-side engaging unit which protrudes from an edge section of the bent unit and which engages with the under surface of the board-like member. Therefore, mainly the positioning of the attachment bracket in the left and right directions can be carried out accurately due to the bent unit, and the attachment bracket will not be easily displaced in the left and right directions. In addition, the rigidity of the attachment bracket itself can be improved. Furthermore, since the attachment bracket includes the bracket-side engaging unit, mainly the positioning of the attachment bracket in the up and down directions can be carried out accurately due to the bracket-side engaging unit, and the attachment bracket will not be easily displaced in the up and down directions.

The attachment bracket is attached in the concave by the bracket-side engaging unit engaging with the under surface of the board-like member and by the attachment bracket engaging with the nail unit which is formed on the upper surface of the concave so as to protrude therefrom. Therefore, the positioning of the attachment bracket can be carried out more accurately and the attachment bracket will not be easily displaced in the front and rear directions, the up and down directions and the like.

Ribs which respectively support the both end sections of the attachment bracket are formed on the upper surface of the concave. Therefore, since the main body unit of the attachment bracket will be in a state slightly floating in the concave with respect to the part other than the rib parts, the attachment bracket can readily absorb a part of the load when the load of the passenger is applied to the sensor. Further, since the rigidity of the concave itself can be improved by having the ribs, the concave will not be easily damaged.

The attachment bracket includes the guide unit for the harness which electrically connects the sensor and an external device, and the guide unit inclines downward. Therefore, the harness will be supported by the guide unit from below in the state where the harness gradually inclines downward by being guided by the guide unit. Thus, the harness which is supported by the guide unit will not easily shake with respect to the sensor even when the seat shakes, and the harness will not be easily damaged nor cut off.

The attachment bracket includes a cutout that formed at a position within an outer circumference section of the attachment bracket, corresponding to a section that is raised due to a wire being inserted in the board-like member. Therefore, the attachment bracket and the parts raised by the wires can be prevented from interfering with each other. Thus, the attachment bracket, the board-like member and the like can be prevented from being damaged and the like.

The concave in which the sensor is disposed is formed at a position avoiding a position right under the hollow section formed in the cushion pad. Therefore, the load which is applied to the cushion pad when the passenger sits in the seat is directly applied to the sensor without being absorbed by the hollow section formed in the cushion pad. Thus, the pressure applied to the sensor can be increased accurately, and it will be easy to detect that the passenger has sat in the seat by the sensor.

However, although various technically preferred limitations for implementing the present invention are included in the following embodiments, the technical scope of the present invention is not limited to the following embodiments and the examples shown in the drawings in any way.

A seat <NUM> shown in <FIG> is placed in a vehicle such as an automobile and the seat <NUM> is where a passenger such as a driver sits. As shown in <FIG>, the seat <NUM> includes a seat cushion <NUM> which supports the buttocks and thighs of the passenger, a seat back <NUM> which becomes a backrest, the lower end section thereof being supported by the seat cushion <NUM>, and a headrest <NUM> which is provided on the seat back <NUM> and which supports the head of the passenger. Here, auxiliary supporting units such as a neck-rest, armrests, footrests, an ottoman and the like can be included in addition.

As shown in <FIG>, the seat cushion <NUM> mainly includes a seat cushion frame <NUM> (see the after-mentioned <FIG>) which is the bone structure, a cushion pad <NUM> which is disposed on the seat cushion frame <NUM>, and an outer cover <NUM> (omitted in <FIG>, see <FIG>) which forms the outer surface of the seat by covering the seat cushion frame <NUM> and the cushion pad <NUM>.

In the embodiment, an air passage <NUM> for air (hot air and cold air) is formed in the seat cushion <NUM> between the cushion pad <NUM> and the outer cover <NUM>. However, the air passage <NUM> is not mandatory.

In particular, as shown in <FIG>, a concave for air passage 30A which forms a part of the air passage <NUM> is formed in the cushion pad <NUM>. Further, a concave (not shown) which forms the rest of the air passage <NUM> is formed in the cover member 12A at the position corresponding to the concave for air passage 30A, and the air passage <NUM> is formed by fitting the cover member 12A in a predetermined section of the cushion pad <NUM>.

Further, a plurality of punching holes are formed in the cover member 12A, and these punching holes are the air vents 30C of the air passage <NUM>. Furthermore, the cushion pad <NUM> including the cover member 12A is covered with the outer cover <NUM>, at least the section of the outer cover <NUM> corresponding to the air vents 30C being air permeable.

The air taken in from the blower (not shown) is sent inside the air passage <NUM> via the through hole 30B, and the air flowed through the air passage <NUM> is blown out toward the passenger from the air vents 30C of the air passage <NUM>.

The seat cushion <NUM> of the embodiment includes the seat cushion frame <NUM> under the cushion pad <NUM>. As shown in <FIG>, the seat cushion frame <NUM> mainly includes side frames 17A which form a left and right pair, connecting members 17B which connect the front end sections and the rear end sections of the side frames 17A (the connecting member 17B for the front end side is disposed under the pan frame <NUM>), and the pan frame <NUM> which bridges across the side frames 17A and the connecting members 17B.

Here, in the embodiment, a case where the pan frame <NUM> functions as a board-like member which is disposed under the cushion pad <NUM> is described. However, a case where the board-like member is configured in a different form other than the pan frame <NUM> will be described later as a modification example.

The pan frame <NUM> (board-like member) has a concave <NUM> formed in the upper surface thereof, and the sensor <NUM> is disposed inside the concave <NUM>. For example, the sensor <NUM> can be a position sensor which can detect whether a passenger is seated in the seat <NUM>.

The sensor <NUM> is fixed to an attachment bracket <NUM> and then, the attachment bracket <NUM> to which the sensor <NUM> is fixed is disposed inside the concave <NUM>.

By having the configuration where the sensor <NUM> is fixed to the attachment bracket <NUM> and then the attachment bracket <NUM> is attached in the concave <NUM>, the sensor <NUM> can be easily fixed to the attachment bracket <NUM> and the attachment bracket <NUM> can also be easily attached in the concave <NUM>. Therefore, the sensor <NUM> can be easily disposed in the concave <NUM>.

Further, in the state where the seat <NUM> is assembled, the cushion pad <NUM> is disposed on the sensor <NUM>. Then, when a passenger sits in the seat <NUM>, the load of the passenger is applied to the sensor <NUM> via the cushion pad <NUM>. At this time, if the sensor <NUM> is directly attached in the concave <NUM> of the pan frame <NUM>, the entire load will be applied to the sensor <NUM> and the sensor <NUM> may be influenced in a bad way. However, if the sensor <NUM> is attached in the concave <NUM> via the attachment bracket <NUM> as described above, a part of the load of the passenger will be absorbed by the attachment bracket <NUM> when the load of the passenger is applied to the sensor <NUM>. Therefore, comparing to the case where the sensor <NUM> is directly attached in the concave <NUM>, the influence of the load of the passenger on the sensor <NUM> is reduced.

Hereinafter, the configuration and the like of the concave <NUM> and the attachment bracket <NUM> will be described in detail. <FIG> is a schematic view illustrating the sensor <NUM> and the attachment bracket <NUM>, and <FIG> is an enlarged view illustrating the concave <NUM> and the like formed in the pan frame <NUM> (board-like member).

In the plate-like main body unit 2a of the attachment bracket <NUM>, engaging holes 2b with which the engaging units 1a of the sensor <NUM> engage are formed and holes 2c in which the screw units 1b (not shown in <FIG>, see the after-mentioned <FIG>) of the sensor <NUM> are to be inserted are formed. By inserting the engaging units 1a of the sensor <NUM> in the engaging holes 2b of the attachment bracket <NUM> and the engaging units 1a respectively engaging with the engaging holes 2b, and in this state, by further screwing on the screw units 1b which are inserted in the holes 2c of the attachment bracket <NUM> from the back side (that is, the lower side) of the attachment bracket <NUM>, the sensor <NUM> can be easily attached to the attachment bracket <NUM>.

A harness 1A which electrically connects the sensor <NUM> and external devices (not shown in the drawing, a power device, a device which processes the signals from the sensor <NUM> and the like) is connected to the sensor <NUM>, and the attachment bracket <NUM> includes a guide unit 2d for the harness 1A. Since the guide unit 2d gradually inclines downward with respect to the main body unit 2a of the attachment bracket <NUM>, the harness 1A is guided by the guide unit 2d to be in a state where it gradually inclines downward.

If the attachment bracket <NUM> does not have the guide unit 2d, the harness 1A will hang down by its own weight at the part where the harness 1A and the sensor <NUM> are connected. In such state, when the seat <NUM> shakes along with the vehicle shaking, the harness 1A will shake relatively in a large movement with respect to the sensor <NUM>. Therefore, the harness 1A can be easily damaged or can be easily cut off. With respect to the above, by supporting the harness 1A by the guide unit 2d of the attachment bracket <NUM> as described above, the harness 1A being in the state where it gradually inclines downward, the harness 1A which is supported by the guide unit 2d will not easily shake relatively with respect to the sensor <NUM> even when the seat <NUM> shakes. Therefore, the harness 1A will not be easily damaged nor easily cut off.

Further, the main body unit 2a of the attachment bracket <NUM> has cutouts 2e formed at the outer circumference section thereof.

Due to the attachment bracket <NUM> having the cutouts 2e at the outer circumference thereof, even in the case where the sensor <NUM> and the attachment bracket <NUM> are in the state of receiving the load as described above and a force which can deform the main body unit 2a of the attachment bracket <NUM> is applied thereto, the cutouts 2e absorb the deformation of the main body unit 2a of the attachment bracket <NUM>. Therefore, the deformation of the main body unit 2a of the attachment bracket <NUM> can easily return to the original state when the force is not applied to the attachment bracket <NUM> any more, and the attachment bracket <NUM> will not remain to be in the deformed state.

On the other hand, the concave <NUM> of the pan frame <NUM> has an engaging unit for attaching the attachment bracket <NUM> in the concave <NUM> by engaging with the attachment bracket <NUM> formed thereto.

In particular, as shown in <FIG>, nail units 20a are formed as the engaging unit on the upper surface of the concave <NUM> so as to protrude, the nail units 20a being formed in the shape of nail. Further, the main body unit 2a of the attachment bracket <NUM> has engaging holes 2f which engage with the nail units 20a formed therein. When the attachment bracket <NUM> to which the sensor <NUM> is attached is to be attached in the concave <NUM>, as shown in <FIG>, the nail units 20a of the concave <NUM> and the engaging holes 2f of the attachment bracket <NUM> will engage with each other. Here, in <FIG>, the sensor <NUM> and the harness 1A are omitted so that the engagement of the nails 20a and the engaging holes 2f can be seen clearly.

As described above, although this can also be said for the after-mentioned second engaging units 20b and the like, the attachment bracket <NUM> can be easily attached in the concave <NUM> in the embodiment since the attachment bracket <NUM> can be attached in the concave <NUM> just by making the attachment bracket <NUM> (engaging holes 2f) engage with the engaging unit (nail units 20a) formed in the concave <NUM>.

Further, due to the attachment bracket <NUM> being attached in the concave <NUM> in the state where the nail units 20a of the concave <NUM> and the engaging holes 2f of the attachment bracket <NUM> engaging with each other, mainly the positioning of the attachment bracket <NUM> in the front and rear directions can be carried out accurately due to the nail units 20a. Furthermore, the nail units 20a can contribute to the positioning of the attachment bracket <NUM> in the right and left directions. Moreover, when the attachment bracket <NUM> is to be attached to the concave <NUM>, by confirming that the nail units 20a protrude upward from the engaging holes 2f of the attachment bracket <NUM>, whether the engaging holes 2f of the attachment bracket <NUM> and the nail units 20a are engaged with each other in an appropriate way and whether the attachment bracket <NUM> is disposed at an appropriate position in the concave can be confirmed.

Here, the case where the sensor <NUM> is disposed in the concave <NUM> in the state where the harness 1A extends to the left side of the sensor <NUM> is shown in <FIG>. However, there may be a case where the sensor <NUM> is disposed in the concave <NUM> in the state where the harness 1A extends to the right side of the sensor <NUM>. Further, the nail units 20a are only formed in the rear side section of the concave <NUM> in the embodiment as shown in <FIG>. However, since the direction of the harness 1A, that is the direction of the guide unit 2d, may be in the left direction or in the right direction, therefore, the engaging holes 2f of the attachment bracket <NUM> are formed not only in the rear side section but also in the front side section as in the state shown in <FIG>.

Further, as shown in <FIG>, the second engaging units 20b are formed near the nail units 20a on the upper surface of the concave <NUM>. When the attachment bracket <NUM> is attached in the concave <NUM>, as shown in <FIG>, the edge sections α of the engaging holes 2f of the attachment bracket <NUM> are fit in between the nail units 20a and the second engaging units 20b.

In such way, when the attachment bracket <NUM> to which the sensor <NUM> is attached is attached in the concave <NUM> of the pan frame <NUM>, the positioning of the attachment bracket <NUM> in the front and rear directions can be carried out more accurately due to the edge sections α of the engaging holes 2f of the attachment bracket <NUM> being fit in between the nail units 20a and the second engaging units 20b of the concave <NUM>. Further, the attachment bracket <NUM> will not be easily displaced in the front and rear directions.

Furthermore, in the embodiment, the left and right edge sections of the concave <NUM> are formed so as to be slightly higher than the upper surface of the concave <NUM> as shown in <FIG>, and these sections are the ribs 20c which respectively support the both edge sections (in the embodiment, the left and right sections) of the main body unit 2a of the attachment bracket <NUM> (see <FIG>).

By having the ribs 20c in the way as described above, the part of the main body unit 2a of the attachment bracket <NUM> other than the parts supported by the ribs 20c will be slightly in the air, floating above the upper surface of the concave <NUM>. Therefore, as described above, the attachment bracket <NUM> can readily absorb a part of the load when the load of the passenger is applied to the sensor <NUM>. Moreover, since the rigidity of the concave <NUM> itself can be improved by having the ribs 20c comparing to the case without the ribs 20c, the concave <NUM> will not break easily when a passenger sits in the seat <NUM> and the load of the passenger is applied to the pan frame <NUM>, bending the pan frame <NUM>.

Here, for example, the rigidity of the concave <NUM> can be improved by further forming a rib on the under surface of the concave <NUM>.

Further, escape units 20d are formed in the concave <NUM> as openings, and the escape units 20d are formed so that the engagement units 1a, the screw units 1b and the like of the sensor <NUM> which protrude downward from the under surface of the attachment bracket <NUM> can be positioned in the escape units 20d as shown in <FIG> when the attachment bracket <NUM> is attached to the concave <NUM>. In the embodiment, by having such configuration, the engagement units 1a, the screw units 1b and the like of the sensor <NUM> which protrude downward from the under surface of the attachment bracket <NUM> will not interfere with the concave <NUM> when the attachment bracket <NUM> is attached in the concave <NUM>.

In the embodiment, the attachment bracket <NUM> also has a structure for engaging with the concave <NUM> of the pan frame <NUM>. In particular, the attachment bracket <NUM> includes bent units <NUM> which are respectively bent downward at the left and right edge sections of the main body unit 2a as shown in <FIG>. Here, in the state shown in <FIG>, the left side bent unit <NUM> of the attachment bracket <NUM> is divided in two, one in the front side and the other in the rear side, because the guide unit 2d is formed between the two divided parts of the bent unit <NUM>, and the right side bent unit <NUM> of the attachment bracket <NUM> is formed as one plate-like unit (see <FIG> and the after-mentioned <FIG>).

When the attachment bracket <NUM> is to be attached in the concave <NUM>, the ribs 20c of the concave <NUM> will be tightly fit between the bent units <NUM> (see <FIG>) on the left and right sides. In such way, mainly the positioning of the attachment bracket <NUM> can be carried out accurately due to the bent units <NUM>, and the attachment bracket <NUM> will not be easily displaced in the left and right directions. Further, by bending the attachment bracket <NUM> to form the bent units <NUM>, the rigidity of the attachment bracket <NUM> itself can be improved.

Further, the bent units <NUM> of the attachment bracket <NUM> have bracket-side engaging units <NUM> formed thereto so as to protrude in the front direction from the front end sections of the bent units <NUM> and protrude in the rear direction from the rear end sections of the bent units <NUM>.

Furthermore, as shown in <FIG>, when the attachment bracket <NUM> is attached in the concave <NUM> of the pan frame <NUM>, the bracket-side engaging units <NUM> of the attachment bracket <NUM> engage with the under surface of the pan frame <NUM> (see β in <FIG>, Rs in the drawing show the ribs formed on the under surface of the pan frame <NUM>). By having such configuration, mainly the positioning of the attachment bracket <NUM> in the upward and downward directions can be carried out accurately due to the bracket-side engaging units <NUM>, and the attachment bracket <NUM> will not be easily displaced in the upward and downward directions.

In the embodiment, as described above, by attaching the attachment bracket <NUM> to which the sensor <NUM> is attached in the concave <NUM> of the pan frame <NUM>, the sensor <NUM> can be accurately and firmly attached in the concave <NUM> of the pan frame <NUM> via the attachment bracket <NUM> as shown in <FIG>.

On the other hand, in the case where the openings 18A are formed in the pan frame <NUM> as shown in <FIG> and <FIG>, the harness 1A can be guided so as to go under the seat <NUM> by inserting the harness 1A in an opening 18A.

Here, the opening 18A for inserting the harness 1A can be newly formed in the pan frame <NUM>. Hereinafter, although a description will be given on the basis of <FIG>, <FIG> and other drawings, the present invention is not limited to the case where two openings 18A are formed as shown in <FIG> and other drawings, and there may be one opening 18A or there may be three or more openings 18A.

Further, there is no need to form the openings 18A on the left and right sides of the concave <NUM> as shown in <FIG> and other drawings and the openings 18A may be formed on the front and rear sides or the like of the concave <NUM>. Furthermore, the openings 18A may be cutouts (that is, formed in the shapes that are cut out inward from the end sections of the pan frame <NUM>), and the openings 18A are not limited to the holes as shown in <FIG> and other drawings. Further, the openings 18A do not need to be the opening for the duct <NUM> which will be described hereinafter.

In the seat <NUM> of the embodiment, as shown in <FIG>, the air passage <NUM> is formed between the cushion pad <NUM> and the outer cover <NUM> of the seat cushion <NUM>. The air sent in from the blower (not shown) which is provided under the pan frame <NUM> is sent into the air passage <NUM> through the through hole 30B, and the air flowed through the air passage <NUM> is blown out toward the passenger from the air vents 30C of the air passage <NUM>. Further, an opening 18A is formed as a through hole in which a duct <NUM> (see <FIG>) for supplying the air to the through hole 30B from the blower can be inserted.

Therefore, by using the opening 18A as the opening for inserting the harness 1A of the sensor <NUM>, the opening 18A for duct which is already formed can be utilized without newly forming an opening 18A in the pan frame <NUM> and the harness 1A can be inserted in the opening 18A.

Moreover, the blower is provided under the pan frame <NUM> and usually, is provided either on the left or right side of the seat <NUM>. Therefore, the position in the pan frame <NUM> where the duct <NUM> penetrates is also more to the left or right with respect to the center corresponding to the position of the blower. In view of this, in the seat <NUM> of the embodiment, a total of two openings 18A in which the duct <NUM> can be inserted are formed, one on the left side and the other on the right side with respect to the center of the pan frame <NUM> as shown in <FIG> and <FIG> so as to accommodate both cases.

Further, in the embodiment, the section between the two openings 18A is a concave and the above described concave <NUM> of the pan frame <NUM> is formed in this section.

In the embodiment, the openings 18A are formed continuously from the concave <NUM> of the pan frame <NUM> in such way. That is, the above described concave <NUM> in which the sensor <NUM> and the attachment bracket <NUM> are to be disposed is formed at the section between the plurality of openings 18A which are formed near each other (the section between the plurality of openings 18A that bridges across the front section and the rear section of the pan frame <NUM>).

In general, if the plurality of openings 18A are formed near each other, the rigidity of the section between them becomes weak and the section can easily deform. However, in the embodiment, since the rigidity of the concave <NUM> itself is improved by having the ribs 20C formed in the concave <NUM> which is formed in this section as described above, such deformation will not occur easily.

Further, since the harness 1A of the sensor <NUM> which is attached in the concave <NUM> of the pan frame <NUM> via the attachment bracket <NUM> is inserted in an opening 18A which is formed continuously from the concave <NUM>, the harness 1A can be easily routed compared to the case where there is a distance between the concave <NUM> and the opening 18A. Furthermore, if there is a distance between the concave <NUM> and the opening 18A, the harness 1A will be sandwiched between the pan frame <NUM> and the cushion pad <NUM> (see <FIG> and the after-mentioned <FIG>) and there is a possibility that the harness 1A is damaged due to the harness 1A and the pan frame <NUM> or the harness 1A and the cushion pad <NUM> rubbing against each other. However, if the concave <NUM> and the opening 18A are formed continuously as in the embodiment, the rubbing as described above will not easily occur and the harness 1A will not be easily damaged nor cut off.

Further, the duct <NUM> will be inserted in any one opening 18A of the plurality of openings 18A as shown in <FIG>. Therefore, by inserting the harness 1A in the opening 18A in which the duct <NUM> is not inserted, the harness 1A and the duct <NUM> will not interfere with each other and the harness 1A and the duct <NUM> will not rub against each other. Thus, the harness 1A will not be easily damaged nor cut off.

Here, the configuration may be such that the harness 1A is inserted in the opening 18A in which the duct <NUM> is inserted.

In the embodiment, the duct <NUM> is inserted in the opening 18A of the pan frame <NUM> and is inserted in the through hole 30B which is formed in the cushion pad <NUM> from below as shown in <FIG>. Since the cushion pad <NUM> will not be raised due to the duct <NUM> being inserted in the through hole 30B, the state where the upper surface of the sensor <NUM> abutting the under surface of the cushion pad <NUM> will be maintained.

Further, when a passenger sits in the seat <NUM>, the load is applied to the cushion pad <NUM> from above, the cushion pad <NUM> is compressed and the pressure applied to the sensor <NUM> from the cushion pad <NUM> increases. Therefore, the sensor <NUM> can reliably detect the load when a passenger sits in the seat <NUM>.

Here, in <FIG>, there is shown a configuration where the upper surface of the pan frame <NUM> and the upper surface of the sensor <NUM> are in flash and where the cushion pad <NUM> whose bottom is flat is place on the pan frame <NUM> and the sensor <NUM>. However, the configuration may be such that the sensor <NUM> is disposed so that the upper surface of the sensor <NUM> be higher than the upper surface of the pan frame <NUM> and that a concave is formed in the section of the cushion pad <NUM> corresponding to the sensor <NUM>.

Moreover, if the concave <NUM> of the pan frame <NUM> is formed at the position right under a hollow section such as the air passage <NUM> or the like formed in the cushion pad <NUM> as shown in <FIG>, the section of the cushion pad <NUM> above the hollow section will deform downward and absorbs the load when a passenger sits in the seat <NUM>, and the load will not be fully transmitted to the section below the hollow section. Therefore, the pressure applied to the sensor <NUM> will not increase sufficiently and it may be difficult to detect that a passenger has sat in the seat <NUM> by the sensor <NUM>.

Therefore, it is preferred that the concave <NUM> in which the sensor <NUM> is disposed is formed at a position other than the position right below the hollow section such as the air passage <NUM> or the like which is formed in the cushion pad <NUM>. By having such configuration, the load applied to the cushion pad <NUM> will be directly applied to the sensor <NUM> when a passenger sits in the seat <NUM>. Therefore, the pressure which is applied to the sensor <NUM> can increase appropriately and whether a passenger has sat in the seat <NUM> can be easily detected.

As described above, according to the disposition structure of the sensor <NUM> in the seat <NUM> of the embodiment, the sensor <NUM> is disposed in the concave <NUM> which is formed in the upper surface of the board-like member (pan frame <NUM>) which is disposed under the cushion pad <NUM> (see <FIG>).

In the traditional disposition structure of a sensor in a seat, as described above, the sensor <NUM> is disposed between the cushion pad <NUM> and the outer cover <NUM> (that is, just under the outer cover). Therefore, the passenger who sat in the seat <NUM> can feel something against their buttocks or thighs through the outer cover <NUM> of the seat <NUM> and the sitting comfort may be unpleasant.

However, in the disposition structure of the sensor <NUM> in the seat <NUM> according to the embodiment, since the cushion pad <NUM> is placed between the buttocks and thighs of the passenger and the sensor <NUM> as described above, the passenger who is sitting in the seat <NUM> will not feel the sensor <NUM> against their buttocks and thighs and the sitting comfort of the passenger can improve comparing to the traditional case.

Further, if the sensor <NUM> is simply disposed on the upper surface of the board-like member (pan frame <NUM>), the cushion pad <NUM> will be raised for the height of the sensor <NUM>, and this can cause discomfort in the passenger who is setting and the sitting comfort may be unpleasant. However, according to the disposition structure of the sensor <NUM> in the seat <NUM> of the embodiment, since the concave <NUM> is formed in the upper surface of the board-like member (pan frame <NUM>) and the sensor <NUM> is disposed therein as described above, such discomfort as described above can be avoided and the sitting comfort can be improved.

Here, in the above described embodiment, the case where the pan frame <NUM> which is disposed under the cushion pad <NUM> is used as the board-like member is described. However, the structure of the seat cushion frame <NUM> under the cushion pad <NUM> (not shown in <FIG>), for example, may include the pan frame <NUM> and the wires 17C (also called S springs or the like) as shown in <FIG> or may only include the wires 17C and not the pan frame <NUM>.

In such case, the board-like member can be set at the section where the wires 17C are disposed.

At that time, for example, the board-like member <NUM> can be set at the section where the wires 17C are disposed so that the wires 17C be inserted therein as shown in <FIG>. Further, in the way similar to that in the above described embodiment, the concave <NUM> can be formed in the upper surface of the board-like member <NUM> and the sensor <NUM> can be disposed in the concave <NUM> in the state where it is fixated to the attachment bracket <NUM>.

Here, although the engaging units (see <FIG> and <FIG>) and the like for attaching the attachment bracket <NUM> in the concave <NUM> are not shown in <FIG>, the engaging units and the like are formed in both the concave <NUM> and the attachment bracket <NUM> as needed. Although the harness 1A and the like of the sensor <NUM> are also not shown, the attachment bracket <NUM> can also include the guide unit 2d (see <FIG>) and the like. In addition, the configuration of the concave <NUM>, the attachment bracket <NUM> and the like according to the above described embodiment can be applied to the concave <NUM>, the attachment bracket <NUM> and the like of the modification example as needed.

In the case of the modification example shown in <FIG>, since the wires 17C are inserted in the board-like member <NUM>, the parts of the concave <NUM> of the board-like member <NUM> where the wires 17C are inserted are raised comparing to the other parts (see the dotted lines in the drawing). Therefore, the cutouts 2e (see <FIG>) of the attachment bracket <NUM> in the above described embodiment can be formed at the positions corresponding to the parts raised by the wires 17C which are inserted in the board-like member <NUM> as shown in <FIG>.

By having such configuration, in addition to the functions and effects described in the above embodiment, the attachment bracket <NUM> and the parts raised by the wires 17C can be prevented from interfering with each other due to the attachment bracket <NUM> having the cutouts 2e formed at the parts corresponding to the parts raised by the wires 17C. Therefore, the attachment bracket <NUM>, the board-like member <NUM> and the like can be prevented from being damaged and the like.

Here, it is needless to say that the present invention is not limited to the above described embodiment and modification example, and various modifications can be made as needed as long as they are within the scope of the appended claims.

Claim 1:
A sensor disposition structure in a seat, comprising:
a cushion pad (<NUM>); and
a board-like member (<NUM>) which is disposed under the cushion pad,
wherein
a concave (<NUM>) is formed in an upper surface of the board-like member, and a sensor (<NUM>) is disposed in the concave,
the sensor is disposed in the concave while being fixed to an attachment bracket (<NUM>), and
the attachment bracket includes a cutout (2e) at an outer circumference section thereof;
characterised in that:
the cutout is formed at a position corresponding to a section that is raised due to a wire being inserted in the board-like member.