JP6246604B2 - Seat detection device, sensor support plate, and sensor fixing method - Google Patents

Description

  The present invention relates to a seating detection device, and more particularly to a sensor support plate that supports a sensor for detecting seating on a seat.

  As one of safety systems in vehicles, there is known an alarm system that issues a warning when a seat belt is not worn when an occupant is seated in a seat. In this alarm system, a seating detection device is used to detect whether an occupant is seated in a seat. As such a seating detection device, for example, a device in which a membrane switch having a detection unit for detecting a load is disposed below a cushion pad of a seat is known (see, for example, Patent Document 1).

  However, in such a seating detection device, since the membrane switch is in contact with the lower surface of the cushion pad, the cushion pad is used not only when an occupant is sitting on the seat but also when an object is placed on the seat. Due to the load applied to the membrane, the membrane switch is likely to be turned on, and erroneous detection tends to occur.

JP 2011-105278 A

  The present invention has been made in view of such problems of the prior art, and a first object thereof is to provide a seating detection device capable of appropriately detecting the seating of an occupant.

  A second object of the present invention is to provide a sensor support plate that enables appropriate detection of the occupant's seating by appropriately supporting the sensor.

  Furthermore, a third object of the present invention is to provide a sensor fixing method that enables appropriate detection of occupant seating by appropriately supporting the sensor.

According to the first aspect of the present invention, a seating detection device capable of appropriately detecting the seating of an occupant is provided. The seating detection device includes a sensor that detects a vertical displacement of the cushion pad with respect to a support frame that supports a cushion pad of a seat, a sensor support plate for attaching the sensor to the support frame, and an output from the sensor And a determination unit that determines whether an occupant is seated in the seat. The sensor support plate has a flat plate-shaped sensor support part on which the sensor is placed and an attachment part extending from the sensor support part. The attachment portion is in line contact with at least one upper extension portion that can be inserted between the lower surface of the cushion pad of the seat and the upper surface of the support frame that supports the cushion pad, and the lower surface of the edge portion of the support frame. And at least one lower extension configured to make point contact at two or more locations. By sandwiching the edge portion of the support frame between the at least one upper extension portion and the at least one lower extension portion, the at least one of the sensor support portions is pushed downward. The attachment portion is fixed to the support frame so that the sensor support portion can rotate around a position where the lower extension portion is in contact with the lower surface of the support frame.

According to the second aspect of the present invention, there is provided a sensor support plate that enables appropriate detection of the occupant's seating by appropriately supporting the sensor. The sensor support plate includes a flat sensor support portion on which a sensor for detecting a displacement of the cushion pad in the vertical direction with respect to a support frame supporting the cushion pad of the seat is mounted, and an attachment portion extending from the sensor support portion. have. The mounting portion has at least one upper extension portion can be inserted between the upper surface of the lower surface and the support frame of the cushion pad of the seat, the lower surface in line contact or two places or more edges of the support frame And at least one lower extension configured to make point contact. By sandwiching the edge portion of the support frame between the at least one upper extension portion and the at least one lower extension portion, the at least one of the sensor support portions is pushed downward. The attachment portion is fixed to the support frame so that the sensor support portion can rotate around a position where the lower extension portion is in contact with the lower surface of the support frame.

According to the third aspect of the present invention, there is provided a sensor fixing method that enables appropriate detection of occupant seating by appropriately supporting the sensor. In this method, a sensor for detecting the vertical displacement of the cushion pad with respect to the support frame that supports the cushion pad of the seat is placed on a flat sensor support. Further, at least one upper extension extending from the sensor support is inserted between the lower surface of the cushion pad and the upper surface of the support frame, and at least one lower extension extending from the sensor support is Line contact or point contact at two or more locations on the lower surface of the edge of the support frame. By said at least one between the upper extending portion and said at least one lower extension portion sandwiching an edge portion of the support frame write Mukoto, wherein when said sensor support is pushed downward at least 1 The sensor is fixed to the support frame so that the sensor support portion can rotate around a position where two lower extending portions are in contact with the lower surface of the support frame.

  Each of the sensor support portion, the at least one upper extension portion, and the at least one lower extension portion is formed symmetrically with respect to a plane perpendicular to the direction along the edge of the support frame. Preferably it is.

  The at least one lower extension part may include a central lower extension part arranged at the center in the direction along the edge of the support frame. The at least one upper extending portion may include at least one pair of side upper extending portions arranged so as to sandwich the center lower extending portion. Furthermore, the at least one lower extension part may include at least one pair of side lower extension parts arranged so as to sandwich the center lower extension part.

  It is preferable that the sensor support portion, the at least one upper extension portion, and the at least one lower extension portion are integrally formed from a sheet metal.

  The at least one lower extension part may have a bent part whose end part bites into the lower surface of the edge part of the support frame. In this case, the direction in which the bent portion of the lower extension portion extends toward the end portion and the direction in which the end portion of the bent portion contacts the support frame toward the edge portion of the support frame. It is preferable that the angle formed between and be greater than 0 degrees and within 90 degrees.

  Further, the at least one lower extension portion may have an upright portion whose end portion contacts the lower surface of the edge portion of the support frame, and a bent portion that is bent from the end portion of the upright portion. . In this case, the direction in which the bent portion of the lower extension portion extends from the end portion of the upright portion, and the direction from the portion where the end portion of the upright portion contacts the support frame toward the edge portion of the support frame. It is preferable that the angle formed between the two is 90 degrees or more and smaller than 180 degrees.

  According to the present invention, since it is possible to determine whether or not an occupant is seated on the seat based on the vertical displacement of the cushion pad, whether the occupant is sitting on the seat or an object is placed on the seat Can be accurately detected without erroneous detection. As a result, the seating of the occupant can be detected appropriately.

It is a schematic diagram which shows the seat in which the seating detection apparatus in the 1st Embodiment of this invention is provided. It is a perspective view which shows typically the seat support part of the state which removed the cushion pad of the seat of FIG. It is a figure which shows typically the lower part of the seat of FIG. It is sectional drawing which shows typically the displacement sensor provided in the seat of FIG. It is a figure which shows typically the lower part of the seat of the state in which the passenger | crew sat down to the seat. It is a front view which shows the sensor support plate of FIG. It is a top view of the sensor support plate of FIG. It is a right view of the sensor support plate of FIG. It is the figure which looked at the sensor support plate of FIG. 6 in the direction along arrow A. It is a figure which shows typically the lower part of the seat of the state which applied the load locally to the center part of the cushion pad of FIG. It is a figure which shows typically the lower part of the seat in the 2nd Embodiment of this invention. It is a front view which shows the sensor support plate of FIG. It is a top view of the sensor support plate of FIG. It is a right view of the sensor support plate of FIG. It is the figure which looked at the sensor support plate of FIG. 12 in the direction along arrow B.

  Hereinafter, embodiments of a seating detection apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 15, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic diagram showing a seat 10 provided with a seating detection device according to a first embodiment of the present invention. As shown in FIG. 1, the seat 10 includes a cushion pad 30, a backrest member 31, and a headrest 32. A backrest member 31 is connected to the rear end portion of the cushion pad 30, and a headrest 32 is connected to the upper end portion of the backrest member 31. The cushion pad 30 is made of an elastic member such as urethane foam, and is deformed by receiving a load of an occupant or an object placed on the seat 10. The cushion pad 30 is supported by a seat support portion 40 disposed below the cushion pad 30.

  FIG. 2 is a perspective view schematically showing the seat support portion 40 with the cushion pad 30 removed. As shown in FIGS. 1 and 2, the seat support portion 40 includes a support frame 42 as a substantially rectangular frame, a plurality of S-shaped springs 44 provided on the upper surface of the support frame 42, and the support frame 42. And four legs 46 extending downward. The legs 46 of the seat support portion 40 are fixed to a pair of rails 48 attached to the vehicle body, whereby the seat 10 is fixed to the vehicle body. The support frame 42, the legs 46, and the rails 48 have such rigidity that they are not deformed by the load on the occupant or the object applied to the cushion pad 30. As the material of the support frame 42 and the legs 46, for example, metal or ceramic can be used.

  As shown in FIG. 2, a rectangular opening 43 is formed in the support frame 42, and the above-described S-shaped spring 44 is bridged over the opening 43. Each S-shaped spring 44 is composed of a wire-shaped metal member that is repeatedly bent into an S-shape. The cross-sectional shape of the S-shaped spring 44 is circular, for example. The plurality of S-shaped springs 44 extend in parallel with each other in the front-rear direction, and the front end portion and the rear end portion thereof are attached to the upper surface of the support frame 42. The cushion pad 30 is placed on these S-shaped springs 44, and the cushion pad 30 is elastically supported by the plurality of S-shaped springs 44.

  As shown in FIG. 1, in this embodiment, a displacement sensor 50 is attached to the support frame 42. The displacement sensor 50 detects the vertical displacement of the cushion pad 30 relative to the support frame 42. The displacement sensor 50 is connected to a determination processing unit 52 that determines whether an occupant is seated on the seat 10 based on the output of the displacement sensor 50.

  FIG. 3 is a diagram schematically showing a lower portion of the seat 10. As shown in FIG. 3, a sensor support plate 60 is attached to the edge of the support frame 42, and the displacement sensor 50 is placed on the sensor support plate 60. That is, the displacement sensor 50 is supported by the sensor support plate 60 and is held below the cushion pad 30 and the S-shaped spring 44.

  As shown in FIG. 3, the sensor support plate 60 includes a flat plate-shaped sensor support portion 62 on which the displacement sensor 50 is placed, and an attachment portion 64 attached to the edge of the support frame 42. The displacement sensor 50 is fixed to the upper surface of the sensor support portion 62 using a screw or the like. The sensor support plate 60 is preferably a plate made of a metal having a high yield stress such as SUS301H material from the viewpoint of durability.

  As shown in FIG. 3, the displacement sensor 50 in the present embodiment includes a pressure-sensitive switch 51 fixed on the sensor support portion 62 of the sensor support plate 60, and a pressing member 53 placed on the pressure-sensitive switch 51. have. The displacement sensor 50 is disposed below the cushion pad 30 and is positioned between adjacent wires of the S-shaped spring 44. That is, the displacement sensor 50 is disposed at a distance from the lower surface of the cushion pad 30 so as not to overlap the S-shaped spring 44 on the XY plane. A membrane sensor can be used as the pressure sensitive switch 51.

  FIG. 4 is a cross-sectional view schematically showing the displacement sensor 50. As shown in FIG. 4, the pressure-sensitive switch 51 of the displacement sensor 50 includes a first insulating sheet 21 in contact with the sensor support portion 62 of the sensor support plate 60, and a first attached to the upper surface of the first insulating sheet 21. Electrode 22, second insulating sheet 23, second electrode 24 affixed to the lower surface of second insulating sheet 23, and insulation provided between first electrode 22 and second electrode 24. The spacer 25 is included. The spacer 25 forms a gap 26 between the first electrode 22 and the second electrode 24. The first insulating sheet 21, the second insulating sheet 23, and the spacer 25 have flexibility, and are formed of a resin such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate.

  The first electrode 22 is connected to a first terminal (not shown) of the pressure sensitive switch 51, and the second electrode 24 is connected to a second terminal (not shown) of the pressure sensitive switch 51. Yes. In a state where no load is applied to the pressure sensitive switch 51 from above, there is a gap 26 between the first electrode 22 and the second electrode 24, so the first terminal of the pressure sensitive switch 51 and the second terminal Are not electrically connected, and the pressure-sensitive switch 51 is opened. On the other hand, when a load is applied to the lower side of the pressure sensitive switch 51, the second insulating sheet 23 bends downward, the second electrode 24 on the second insulating sheet 23 moves downward, and finally. It contacts the first electrode 22 facing it. Thereby, the first terminal and the second terminal of the pressure-sensitive switch 51 are electrically connected, and the pressure-sensitive switch 51 is closed.

  The pressing member 53 of the displacement sensor 50 is an elastic member that is deformed by the pressure from the lower surface of the cushion pad 30 and presses the pressure sensitive switch 51 downward. As shown in FIG. 4, the pressing member 53 in this embodiment includes a base 54 attached to the upper surface of the second insulating sheet 23 of the pressure sensitive switch 51, and a pressure receiving portion 55 that receives pressure from the lower surface of the cushion pad 30. The first bending portion 56 extending between the base portion 54 and the pressure receiving portion 55, the second bending portion 57 extending downward from the pressure receiving portion 55, and the convex portion protruding downward from the center of the second bending portion 57 58. The base part 54, the pressure receiving part 55, the 1st bending part 56, the 2nd bending part 57, and the convex part 58 are integrally shape | molded, for example with rubber | gum.

  The base 54 is a portion that is a basis of the pressing member 53 and is disposed so as not to overlap the first electrode 22 and the second electrode 24 of the pressure-sensitive switch 51 in the XY plane. An opening is formed in the center of the base 54, and this opening is positioned above the first electrode 22 and the second electrode 24 of the pressure-sensitive switch 51. For example, the pressure receiving portion 55 is formed in a circular tube having an outer diameter smaller than the diameter of the opening. Further, a gap is formed between the convex portion 58 and the second insulating sheet 23 of the pressure sensitive switch 51.

  The first bending portion 56 supports the pressure receiving portion 55 and deforms (bends) in response to pressure from the cushion pad 30 that contacts the pressure receiving portion 55. Further, the second bending portion 57 moves toward the pressure-sensitive switch 51 until the convex portion 58 contacts the upper surface of the second insulating sheet 23 while the first bending portion 56 is bent. When the bending portion 56 is bent, the second bending portion 57 is also bent. With such a configuration, the second insulating sheet 23 of the pressure sensitive switch 51 is pressed by the convex portion 58.

  FIG. 5 shows a state in which an occupant is seated on the seat 10. When an occupant sits on the seat 10, the occupant's load is applied to the cushion pad 30, whereby pressure is applied to the S-shaped spring 44 from the seating surface of the cushion pad 30. As a result, as shown in FIG. 5, the cushion pad 30 and the S-shaped spring 44 located in the opening 43 of the support frame 42 move downward. Thus, when an occupant sits on the seat 10, the cushion pad 30 is displaced downward, the lower surface of the cushion pad 30 comes into contact with the upper surface of the pressure receiving portion 55 of the pressing member 53, and presses the pressure receiving portion 55 downward. Thereby, the convex part 58 of the pressing member 53 comes into contact with the second insulating sheet 23 of the pressure-sensitive switch 51 and further presses the second insulating sheet 23, whereby the second insulating sheet 23 is bent and the second insulating sheet 23 is bent. Electrode 24 is moved downward. When the downward movement of the cushion pad 30 exceeds a predetermined amount, the second electrode 24 comes into contact with the first electrode 22, and the first terminal and the second terminal of the pressure sensitive switch 51 are electrically connected. Connected. Thus, since the pressure sensitive switch 51 is closed when the downward displacement of the cushion pad 30 exceeds a predetermined amount, it is detected whether or not the downward displacement of the cushion pad 30 exceeds the predetermined amount. be able to.

  The determination processing unit 52 determines whether or not an occupant is seated on the seat 10 by measuring a resistance value between the first terminal and the second terminal of the pressure-sensitive switch 51 of the displacement sensor 50. For example, the discrimination processing unit 52 determines that when the resistance value between the first terminal and the second terminal of the pressure sensitive switch 51 is equal to or less than a predetermined threshold (that is, the pressure sensitive switch 51 is closed). In the case) it is determined that an occupant is seated in the seat 10.

  Thus, according to the present embodiment, it is determined whether or not an occupant is seated on the seat 10 based on the vertical displacement of the cushion pad 30 detected by the displacement sensor 50. The displacement in the vertical direction of the cushion pad 30 changes according to the load applied to the cushion pad 30, and differs greatly between when an occupant sits on the seat 10 and when an object is placed on the seat 10. It is possible to accurately detect whether or not an object is sitting or an object is placed.

  Next, the sensor support plate 60 in the present embodiment will be described in more detail. 6 is a front view of the sensor support plate 60, FIG. 7 is a plan view, FIG. 8 is a right side view, and FIG. 9 is a view of the sensor support plate 60 viewed in the direction along arrow A in FIG. As shown in FIGS. 6 to 9, the sensor support plate 60 includes a flat sensor support portion 62 and an attachment portion 64 attached to the edge of the support frame 42. As shown in FIG. 7, the sensor support 62 is formed with four screw holes 63 into which screws for fixing the displacement sensor 50 are screwed.

  The attachment portion 64 extends obliquely upward from the sensor support portion 62 as shown in FIG. 6, and is branched into five on the way as shown in FIGS. More specifically, the attachment portion 64 includes a wide extending portion 70 extending in a divergent shape toward an obliquely upward direction, two upper extending portions 80 branched from the wide extending portion 70 and extending obliquely upward, There are three lower extending portions 90 that branch off from the wide extending portion 70 and extend obliquely upward.

  The three lower extending portions 90 include a central lower extending portion 90A disposed at the center in the direction along the edge of the support frame 42 (X-axis direction), and the central lower extending portion 90A. It is comprised from a pair of side lower side extension part 90B arrange | positioned so that it may pinch | interpose in a X-axis direction. As shown in FIG. 6, each of the lower extending portions 90 has a bent portion 92 that bends upward from the extension plane of the wide extending portion 70. The end portion 92A of the bent portion 92 bites into the lower surface 42B of the edge portion of the support frame 42, and comes into line contact with the lower surface 42B along the X-axis direction.

  The two upper extending portions 80 are composed of a pair of side upper extending portions 80A arranged so as to sandwich the above-described central lower extending portion 90A in the X-axis direction. Each of the upper extending portions 80 includes an upright portion 82 that rises upward from an extension plane of the wide extending portion 70, and a curved portion 84 that extends obliquely upward while being curved from the upright portion 82. As shown in FIG. 3, the curved portion 84 has a shape corresponding to the shape of the upper surface 42A of the support frame 42, and is inserted between the lower surface of the cushion pad 30 and the upper surface 42A of the support frame 42. It has become.

  The gap between the end 92A of the bent portion 92 of the lower extension 90 and the curved portion 84 of the upper extension 80 is designed to be a little narrower than the thickness of the edge of the support frame 42. (See FIG. 6). In this way, when the edge of the support frame 42 is inserted between the upper extension 80 and the lower extension 90, the end 92A of the bent portion 92 becomes the edge of the support frame 42. It bites into the lower surface 42B.

  By the way, as a method of fixing the sensor support plate 60 to the support frame 42, a method of fixing by inserting a bolt or the like through a bolt hole formed in the support frame 42 is conceivable. Depending on the support frame 42, such a bolt may be used. In some cases, holes are not formed. On the other hand, in this embodiment, as shown in FIG. 3, the support frame 42 is sandwiched between the upper extension portion 80 and the lower extension portion 90, and the bent portion 92 of the lower extension portion 90 is sandwiched. Since the end portion 92A is bitten into the lower surface 42B of the edge portion of the support frame 42, the sensor support plate 60 can be fixed to the support frame 42 without using bolts or the like.

  Here, the direction in which the bent portion 92 of the lower extension portion 90 extends toward the end portion 92 </ b> A and the portion where the end portion 92 </ b> A of the bent portion 92 contacts the support frame 42 go to the edge portion of the support frame 42. The angle α (see FIG. 3) formed by the direction is preferably greater than 0 degree and within 90 degrees. By setting the angle α in such a range, the sensor support plate 60 can be effectively fixed to the support frame 42.

  Furthermore, in the sensor support plate 60 according to the present embodiment, the curved portion 84 of the upper extension 80 is inserted between the lower surface of the cushion pad 30 and the upper surface 42A of the support frame 42, so that an occupant is seated on the seat 10. Then, the curved portion 84 is strongly sandwiched between the lower surface of the cushion pad 30 and the upper surface 42A of the support frame 42 by the weight of the passenger (see the arrow indicating the load in FIG. 5). Therefore, the sensor support plate 60 can be fixed to the support frame 42 more firmly.

  Here, for example, when the occupant takes a baggage placed behind the seat and puts his weight on the seat with his knees facing backwards, the cushion pad 30 is very locally localized. A large load is applied. If the central portion of the cushion pad 30 is excessively displaced downward as described above, an excessive force is applied to the displacement sensor 50 and the sensor support plate 60, and the sensor support plate 60 may be plastically deformed. However, in this embodiment, in such a case, the sensor support plate 60 rotates around the end portion 92A of the bent portion 92 of the lower extension portion 90, so that an excessive force is applied to the sensor support plate 60. Therefore, it is possible to prevent the sensor support plate 60 from being plastically deformed.

  That is, as shown in FIG. 5, when the occupant is seated in the seat in a normal state, the weight of the occupant is distributed and added to the entire cushion pad 30, and therefore the curved portion 84 of the sensor support plate 60 is added. Also, the weight of the occupant is applied, and as described above, the curved portion 84 is firmly sandwiched and fixed between the lower surface of the cushion pad 30 and the upper surface 42A of the support frame 42. On the other hand, when a large load is locally applied to the center of the cushion pad 30, such as when the occupant takes a load placed behind the seat, as shown in FIG. However, unlike the case shown in FIG. 5, almost no load is applied to a portion other than the central portion of the cushion pad 30 (for example, a portion located above the curved portion 84). Since the end portion 92A of the bent portion 92 of the lower extension portion 90 is in line contact with the lower surface 42B of the support frame 42 along the X-axis direction, the center portion of the cushion pad 30 is excessively displaced and the sensor When the sensor support portion 62 of the support plate 60 is pushed downward, the curved portion 84 pushes up the lower surface of the cushion pad 30 as shown by an arrow R in FIG. The entire sensor support plate 60 rotates around the X axis as an axis. Thus, in this embodiment, even when a very large load is locally applied to the central portion of the cushion pad 30, the sensor support plate 60 is connected to the end of the bent portion 92 of the lower extension portion 90. Since it rotates around the portion 92A, excessive force is not applied to the sensor support plate 60, and plastic deformation of the sensor support plate 60 can be prevented.

  Further, as shown in FIGS. 7 to 9, the sensor support plate 60 in the present embodiment is formed symmetrically with respect to the YZ plane (a plane perpendicular to the direction along the edge of the support frame 42). Due to this symmetrical shape, the sensor support plate 60 can rotate around the X axis as described above, but is difficult to rotate around the Y axis. Therefore, the sensor support plate 60 can be stably fixed to the support frame 42.

  In the present embodiment, the example in which the attachment portion 64 of the sensor support plate 60 is branched into two upper extending portions 80 and three lower extending portions 90 has been described. The number of branches of the lower extension 90 is not limited to that illustrated. In order to stably fix the sensor support plate 60 to the support frame 42, the lower extension portion 90 (the central lower extension portion 90A) having the bent portion 92 that makes line contact with the lower surface 42B of the support frame 42 is provided. It is preferable to arrange at the center in the X-axis direction. Furthermore, in consideration of the symmetry with respect to the YZ plane described above, one or more pairs of upper extending portions (side upper extending portions 80A) are arranged so as to sandwich the central lower extending portion 90A in the X-axis direction. Is preferred. When the lower extension 90 is further provided in addition to the center lower extension 90A, one or more pairs of lower extensions so as to sandwich the center lower extension 90A in the X-axis direction. It is preferable to provide 90 (side lower extension part 90B).

  Further, it is not necessary to form the upper extension part 80 and the lower extension part 90 by branching the attachment part 64 of the sensor support plate 60 as in this embodiment, but the upper extension part 80 and the lower extension part 90 are formed. If the portion 90 has a branched shape, the sensor support portion 62, the upper extension portion 80, and the lower extension portion 90 can be integrally formed by pressing one sheet metal. From this viewpoint, it is preferable to form the upper extension part 80 and the lower extension part 90 by branching the attachment part 64 as in the present embodiment.

  FIG. 11 is a diagram schematically showing a lower portion of the seat 10 in the second embodiment of the present invention. 12 is a front view of the sensor support plate 160 according to the second embodiment, FIG. 13 is a plan view, FIG. 14 is a right side view, and FIG. 15 is a view of the sensor support plate 160 in a direction along arrow B in FIG. FIG.

  As shown in FIGS. 11 to 15, the sensor support plate 160 has a flat sensor support portion 162 and an attachment portion 164 attached to the edge of the support frame 42. As shown in FIG. 13, the sensor support portion 162 is formed with four screw holes 163 into which screws for fixing the displacement sensor 50 are screwed. Similarly to the sensor support plate 60 of the first embodiment, the sensor support plate 160 is preferably a plate made of a metal having a high yield stress such as SUS301H material.

  As shown in FIGS. 11 to 15, the attachment portion 164 extends obliquely upward from the sensor support portion 162 and branches into five in the middle. That is, the attachment portion 164 includes a wide extension portion 170 that extends obliquely upward toward the end, two upper extension portions 180 that branch from the wide extension portion 170 and extend obliquely upward, and a wide extension portion. And three lower extending portions 190 branched from 170 and extending obliquely upward.

  The three lower extending portions 190 include a central lower extending portion 190A disposed at the center in the direction along the edge of the support frame 42 (X-axis direction), and the central lower extending portion 190A. It is comprised from a pair of side lower side extension part 190B arrange | positioned so that it may pinch | interpose in an X-axis direction. As shown in FIG. 12, each of the lower extending portions 190 has a rising portion 192 that rises upward from the extension plane of the wide extending portion 170, and a bent portion that is bent at an angle larger than 90 degrees from the end portion 192 </ b> A of the rising portion 192. And a curved portion 194. The end portion 192A of the standing portion 192 is in line contact with the lower surface 42B of the support frame 42 along the X-axis direction.

  The two upper extending portions 180 are composed of a pair of side upper extending portions 180A arranged so as to sandwich the above-described central lower extending portion 190A in the X-axis direction. Each of the upper extending portions 180 includes an upright portion 182 that rises upward from an extension plane of the wide extending portion 70, and a curved portion 184 that extends obliquely upward while being curved from the upright portion 182. As shown in FIG. 11, the curved portion 184 has a shape corresponding to the shape of the upper surface 42A of the support frame 42, and is inserted between the lower surface of the cushion pad 30 and the upper surface 42A of the support frame 42. It has become.

  The gap between the end portion 192A of the standing portion 192 of the lower extension portion 190 and the curved portion 84 of the upper extension portion 80 is designed to be slightly narrower than the thickness of the edge portion of the support frame 42. (Refer FIG. 12) The bending part 194 which bends at an angle larger than 90 degree | times from the edge part 192A is formed. With such a configuration, when the edge portion of the support frame 42 is inserted between the upper extension portion 80 and the lower extension portion 90, the end portion 192 </ b> A of the standing portion 192 and the curved portion of the upper extension portion 80. 84, the edge of the support frame 42 is elastically sandwiched between them.

  In the present embodiment, as shown in FIG. 11, the support frame 42 can be elastically sandwiched between the upper extension portion 180 and the end portion 192A of the upright portion 192 of the lower extension portion 190. The sensor support plate 160 can be fixed to the support frame 42 without using bolts or the like. Here, the direction in which the bent portion 194 of the lower extension 90 extends from the end 192A of the upright portion 192, and the portion where the end 192A of the upright portion 192 contacts the support frame 42 to the edge of the support frame 42. It is preferable that the angle β (FIG. 11) formed by the direction to go is 90 degrees or more and smaller than 180 degrees. By setting the angle β to such a range, the sensor support plate 60 can be effectively fixed to the support frame 42.

  Further, in the sensor support plate 160 according to the present embodiment, when the occupant sits on the seat 10, the curved portion 84 of the upper extension portion 180 is formed on the cushion pad 30 by the weight of the occupant, as in the first embodiment. Since it is strongly sandwiched between the lower surface and the upper surface 42A of the support frame 42, the sensor support plate 60 can be more firmly fixed to the support frame 42.

  Further, for example, when a large load is locally applied to the center of the cushion pad 30 such as when an occupant takes a load placed behind the seat, the central portion of the cushion pad 30 is greatly displaced downward. However, almost no load is applied to a portion other than the central portion of the cushion pad 30 (for example, a portion located above the curved portion 184). As in the first embodiment, the end portion 192A of the standing portion 192 of the lower extension portion 190 is in line contact with the lower surface 42B of the support frame 42 along the X-axis direction. When the sensor part is excessively displaced and the sensor support part 162 of the sensor support plate 160 is pushed downward, the bending part 184 pushes up the lower surface of the cushion pad 30 and the line contact part (end part 192A) is used as an axis. The entire sensor support plate 160 rotates about the X axis. As described above, also in the present embodiment, when a very large load is locally applied to the central portion of the cushion pad 30, the sensor support plate 160 moves the end portion 192A of the standing portion 192 of the lower extension portion 190. Since it rotates about the center, an excessive force is not applied to the sensor support plate 160, and plastic deformation of the sensor support plate 160 can be prevented.

  Also, the sensor support plate 160 in the present embodiment is formed symmetrically with respect to the YZ plane in the same manner as the sensor support plate 60 in the first embodiment. Due to this symmetrical shape, the sensor support plate 160 is Although it can rotate around the axis, it is difficult to rotate around the Y axis. Therefore, the sensor support plate 160 can be stably fixed to the support frame 42.

  Also in the present embodiment, the number of branches of the upper extending portion 180 and the number of branches of the lower extending portion 190 are not limited to those illustrated. Moreover, it is preferable to arrange | position the lower extension part 190 (center lower extension part 190A) which has the edge part 192A of the standing part 192 which line-contacts with the lower surface 42B of the support frame 42 in the center of a X-axis direction. Further, it is preferable to arrange one or more pairs of upper extending portions (side upper extending portions 180A) so as to sandwich the central lower extending portion 190A in the X-axis direction. When the lower extension 90 is further provided in addition to the center lower extension 190A, one or more pairs of lower extensions are provided so as to sandwich the center lower extension 190A in the X-axis direction. It is preferable to provide 190 (side lower extension 190B).

  In addition, it is not necessary to form the upper extension portion 180 and the lower extension portion 190 by branching the attachment portion 164 of the sensor support plate 160 as in this embodiment, but by pressing one sheet metal Since the sensor support portion 162, the upper extension portion 180, and the lower extension portion 190 can be integrally formed, the mounting portion 164 is branched to cause the upper extension portion 180 and the lower extension portion 190 to be branched. Is preferably formed.

  In the first embodiment described above, the end portion 92A of the bent portion 92 is in line contact with the lower surface 42B of the edge portion of the support frame 42, and in the second embodiment, the rising portion 192 of the lower extension portion 190 is in contact. The end portion 192A is in line contact with the lower surface 42B of the support frame 42, but the end portion 92A of the bent portion 92 or the end portion 192A of the upright portion 192 is pointed at two or more places with respect to the lower surface 42B of the support frame 42. It may be in contact. In this case, it is preferable to arrange two or more points in point contact along the X axis. As described above, when the end portion 92A of the bent portion 92 or the end portion 192A of the standing portion 192 is in point contact with the lower surface 42B of the support frame 42 at two or more locations along the X axis, Similarly, the entire sensor support plate 60 can be rotated around the X axis.

  In the above-described embodiment, the example in which the S-shaped spring 44 is used as the spring that supports the cushion pad 30 has been described. However, the spring that supports the cushion pad 30 is not limited to the S-shaped spring. Any spring may be used as long as it can support.

  Furthermore, although the displacement sensor 50 in the above-described embodiment has described the example in which the pressing member 53 is disposed on the pressure-sensitive switch 51, the pressing member 53 is not necessarily required. However, in order to relieve the pressing force from the cushion pad 30 to the pressure sensitive switch 51, it is preferable to provide the pressing member 53 as in the above-described embodiment. In the above-described embodiment, an example in which the pressure-sensitive switch 51 is used as the displacement sensor 50 has been described. Any displacement sensor may be used as long as it can detect the displacement. For example, a magnetic sensor, a laser sensor, an eddy current sensor, or the like can be used as the displacement sensor 50. When a magnetic sensor is used as the displacement sensor 50, it is attached to a permanent magnet on the lower surface of the S-shaped spring 44 or the cushion pad 30, and a magnetic field generated by the permanent magnet is measured. The displacement in the vertical direction of the cushion pad 30 can be detected.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 10 Seat 21 1st insulating sheet 22 1st electrode 23 2nd insulating sheet 24 2nd electrode 25 Spacer 26 Gap 30 Cushion pad 31 Backrest member 32 Headrest 40 Seat support part 42 Support frame 43 Opening part 44 S-shaped spring 46 Leg 48 Rail 50 Displacement Sensor 51 Pressure Sensitive Switch 52 Discrimination Processing Unit 53 Pressing Member 54 Base 55 Pressure-Receiving Unit 56 First Flexing Part 57 Second Flexing Part 58 Protruding Part 60 Sensor Support Plate 62 Sensor Support Part 63 Screw Hole 64 Attachment part 70 Wide extension part 80 Upper extension part 80A Side upper extension part 82 Standing part 84 Bending part 90 Lower extension part 90A Center lower extension part 90B Side lower extension part 92 Bending part 160 Sensor support plate 162 Sensor support part 163 Screw hole 164 Attachment part 170 Wide extension part 180 Upper side Out section 180A side upper extending portion 182 standing part 184 curved portion 190 the lower extending portion 190A lower center extending portion 190B side lower extending portion 192 standing part 194 bent portion

Claims (11)

A flat sensor support portion on which a sensor for detecting the displacement of the cushion pad in the vertical direction relative to the support frame supporting the cushion pad of the seat is placed;
An attachment extending from the sensor support;
With
The mounting portion is
At least one upper extension portion can be inserted between the upper surface of the lower surface and the support frame of the cushion pad of the seat,
At least one lower extension configured to make line contact or point contact at two or more locations on the lower surface of the edge of the support frame;
Only including,
By sandwiching the edge of the support frame between the at least one upper extension and the at least one lower extension, the at least one when the sensor support is pushed downward The attachment portion is fixed to the support frame so that the sensor support portion can rotate around a position where a lower extension portion is in contact with the lower surface of the support frame. Sensor support plate.   Each of the sensor support part, the at least one upper extension part, and the at least one lower extension part is formed symmetrically with respect to a plane perpendicular to a direction along an edge of the support frame. The sensor support plate according to claim 1, wherein The at least one lower extension includes a central lower extension disposed at the center in the direction along the edge of the support frame;
3. The sensor support plate according to claim 2, wherein the at least one upper extending portion includes at least one pair of side upper extending portions arranged so as to sandwich the central lower extending portion. 4. .   The at least one lower extension part further includes at least one pair of side lower extension parts arranged so as to sandwich the central lower extension part. Sensor support plate.   5. The sensor support portion, the at least one upper extension portion, and the at least one lower extension portion are integrally formed from a sheet metal. The sensor support plate described in 1.   6. The sensor support plate according to claim 1, wherein the at least one lower extending portion has a bent portion whose end portion bites into a lower surface of an edge portion of the support frame. .   An angle formed by a direction in which the bent portion of the lower extension portion extends toward the end portion and a direction in which the end portion of the bent portion is in contact with the support frame toward the edge of the support frame. The sensor support plate according to claim 6, wherein is greater than 0 degrees and within 90 degrees.   The at least one lower extending portion includes an upright portion whose end portion is in contact with the lower surface of the edge portion of the support frame, and a bent portion that is bent from the end portion of the upright portion. The sensor support plate according to any one of 1 to 5. An angle formed by the direction in which the bent portion of the lower extension portion extends from the end portion of the upright portion and the direction in which the end portion of the upright portion contacts the support frame toward the edge portion of the support frame The sensor support plate according to claim 8 , wherein is 90 degrees or more and smaller than 180 degrees. A sensor for detecting the vertical displacement of the cushion pad with respect to the support frame,
The sensor support plate according to any one of claims 1 to 9, wherein the sensor support plate is used to attach the sensor to the support frame.
A determination unit that determines whether an occupant is seated in the seat based on an output from the sensor;
A seating detection device comprising: A sensor for detecting a vertical displacement of the cushion pad relative to a support frame that supports the cushion pad of the seat is placed on a flat sensor support;
Inserting at least one upper extension extending from the sensor support between the lower surface of the cushion pad and the upper surface of the support frame;
At least one lower extension extending from the sensor support is brought into line contact or point contact at two or more locations on the lower surface of the edge of the support frame;
By the at least one write Mukoto sandwiching an edge portion of the support frame between the upper extending portion and said at least one lower extension portion, the when the sensor support is pushed downward at least 1 The sensor is fixed to the support frame so that the sensor support portion can rotate around a place where two lower extending portions are in contact with the lower surface of the support frame. Method.

Images