JP4581812B2 - Crew protection device - Google Patents

Description

  The present invention relates to an occupant protection device for protecting an occupant of a seat of a vehicle such as an automobile at the time of a collision. In particular, the occupant's waist is restrained at the time of a front collision, and the occupant's body moves forward and downward. The present invention relates to an occupant protection device configured to prevent.

  Japanese Patent Application Laid-Open No. 10-217818 discloses a system for protecting an automobile occupant at the time of a collision in order to prevent a submarine phenomenon in which the occupant tries to pass through the lower side of the lap belt at the time of a frontal collision even when a seat belt is worn. Describes an occupant protection device in which an inflatable bag is arranged between a seat cushion and a seat pan, and the front portion of the seat cushion is pushed up by inflating the bag at the time of a vehicle collision.

  FIG. 15 is a longitudinal sectional view in the front-rear direction of the seat showing the occupant protection device of the publication. An airbag 204 is disposed between a cushion frame (seat pan) 200 and a seat pad (seat cushion) 202 at the front portion of the seat. The airbag 204 extends in the left-right width direction of the seat and can be inflated by an inflator (gas bag) 206. The upper surface of the seat pad 202 is covered with a trim cover 208, and an occupant sits thereon.

When the inflator 206 is activated at the time of a vehicle collision, the airbag 204 is inflated, and the front part of the seat pad 202 is pushed up or pushed up from below to increase the density, thereby preventing (suppressing) the forward movement of the occupant's body. Included).
JP-A-10-217818

  In the occupant protection device disclosed in Japanese Patent Application Laid-Open No. 10-217818, the airbag 204 disposed below the seat pad 202 may be damaged by rubbing against the seat pad 202.

  Further, in the occupant protection device of the occupant protection device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 10-217818, when the airbag 204 is inflated, the vicinity of the center in the longitudinal direction of the airbag 204 is inflated to the largest extent, and the middle inflation shape ( It tends to be a spinning shape. Thus, when the airbag 204 is inflated in a middle-bulged shape, the vicinity of the center in the left-right direction of the seat pad 202 is strongly pushed up, but the left side portion and the right side portion of the seat pad 202 where the left and right thighs are located are about the center. Can not be pushed up strongly. Therefore, in order to strongly push up the left and right side portions of the seat pad 202, it is necessary to employ a large capacity airbag 204. Further, when the airbag 204 has a large capacity as described above, it is necessary to adopt a high-power inflator 206 so as to match it.

An object of the present invention is to provide an occupant protection device in which a bag disposed under a cushion is prevented from being damaged by rubbing with a seat cushion or the like .

An occupant protection device according to the present invention (Claim 1) is disposed under a front portion of a seat cushion and is inflatable so as to press the front portion of the seat cushion from the lower side. a gas generator for inflating the covers the bag, a passenger protection device having a cover that release opening by being pushed by the bag when the bag is inflated, the lower side of the seat pan of the seat cushion A recess is provided on the upper surface of the bag, the bag is disposed in the recess, the cover is disposed to cover the recess, and the cover covers the recess from above. A main plate portion, a surrounding frame portion depending from the main plate portion, and a tear portion provided on the main plate portion, which is pushed by an inflating bag and is cleaved, and a peripheral portion of the main plate portion is a surrounding frame portion Projecting outward from the outer periphery of the main plate The peripheral edge of the outer peripheral portion is overlapped with the peripheral portion of the recess and fastened to the seat pan, the surrounding frame portion enters the concave portion, and the bag is disposed inside the surrounding frame portion. it is characterized in that there.

Occupant protection system according to claim 2, in claim 1, in the bottom of the recess, is characterized in that the lower end enters the groove of the surrounding frame portion is al provided.

Occupant protection system according to claim 3, Oite to claim 1, wherein the surrounding frame portion and are arranged holding member across the bottom of the bag, both ends of the holding member is locked to surrounding frame portion It is characterized by that.

The occupant protection device according to a fourth aspect of the present invention is the occupant protection device according to any one of the first to third aspects, wherein the tear plate includes a left and right side of the main plate portion along the base end side of the wall portion on the seat rear side of the surrounding frame portion. A lateral tear portion extending in the direction and the left and right ends of the lateral tear portion extending in the front-rear direction of the seat along the base end sides of the left and right wall portions of the surrounding frame portion. it is characterized in that the tear line comprising a tear portion and right tear portion is al provided.

The occupant protection device according to claim 5 is the occupant protection device according to any one of claims 1 to 3 , wherein, as the tear portion, a central tear portion extending in the left-right direction through the central portion of the main plate portion is provided on the main plate portion. A tear line is provided that includes a left tear portion and a right tear portion that extend in the front-rear direction of the seat along the base end sides of the left and right wall portions of the surrounding frame portion. and it is characterized in that has been al.

The occupant protection device according to claim 6 is the occupant protection device according to any one of claims 1 to 3 , wherein the main plate portion is curved upward and convex so that the vicinity of the middle portion in the longitudinal direction of the seat is the highest. as tear portion, near the middle the inter of the main plate portion, and is characterized in that tear line extending in the lateral direction is al provided.

In the occupant protection device of the present invention, since the bag is covered with the cover, the bag is prevented from being damaged by rubbing with the seat cushion or the like. Moreover, since durability required for the bag is reduced, the configuration cost of the bag can be reduced. Incidentally, this cover is that release opening by being pushed by the bag when the bag is inflated.

In the present invention, a recess is provided on the upper surface of the lower side of the seat pan cushion, with placing the bag into the recess, since the structure to place the cover so as to cover the recess, bags and gas generation It is possible to prevent a bowl or the like from biting into the seat cushion and deteriorating the seating comfort of the seat .

In the present invention, when the bag is configured to be held with respect to the cover by the holding member, the bag and the cover can be integrated and attached to the seat pan together.

In the present invention, the cover is provided with a main plate portion disposed above the bag and a surrounding frame portion depending from the main plate portion, and the bag is disposed inside the surrounding frame portion. Therefore , the bag is surrounded by a surrounding frame portion on the side, and the main plate portion is covered on the upper side. For this reason, damage due to rubbing of the bag or the like is sufficiently prevented. Further, it is possible to prevent the bag from directly hitting or catching on the seat pan or the like during the operation of attaching the bag integrated to the cover to the seat pan.

In case of the configuration of arranging the holding member across the bottom of the enclosed frame portion and the bag, because the bag is supported by the holding member from below, those obtained by integrally assembling the bag into the cover to the seat pan The bag is surely prevented from falling off from the cover during the attaching operation .

In the present invention, since Dale enters surrounding frame portion in the recess provided on the upper surface of the lower side of the seat pan of the seat cushion, the bag and gas generator to poor seating comfort of the seat bite into the seat cushion Is prevented. Further, in the present invention, since the Tsu covering a recess in the main plate portion, the water (e.g., beverages) and dust in the recess, is prevented from entering foreign material sand, etc., water, deterioration of the air bag due to foreign matter or the like, Damage is prevented.

In the present invention, since the fastened a marginal portion of the main plate portion to the peripheral portion of the recess, water into the recess, the intrusion of foreign matter can be prevented sufficiently.

  By providing a groove with the lower end of the surrounding frame part in the bottom of the recess, even if water flows in along the inner wall of the recess, the water only accumulates in the groove, and the bag Prevents getting wet with water.

In the present invention, the main plate portion, since there is provided a tear portion that is cleaved by being pushed by the bag to be inflated, is capable of cleaving a cover when the bag expands planned shape.

In the present invention, the gas generator is disposed in the bag, and the gas generator is fastened to the seat pan by the fastening member penetrating the bag, and the bag is sandwiched between the gas generator and the seat pan. It is good also as composition which has. Thereby, the attachment strength to the seat pan of a bag becomes high. Further, the stress applied to the portion of the bag attached to the seat pan when the bag is inflated is reduced.

Reference examples and embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a seat frame of a seat provided with an occupant protection device according to a reference example , and FIG. 2 is a sectional view taken along line II-II in FIG.

  A frame constituting an automobile seat includes a base frame 1 and a back frame 4 rotatably connected to the base frame 1 via a support shaft 2 and a reclining device (not shown). A headrest 6 is attached to the upper portion of the back frame 4. The base frame 1 has left and right side frames 1a and 1b, and a seat pan 8 is installed between the front portions of the side frames 1a and 1b.

  Although not shown, a seat cushion and a seat back made of urethane or the like are attached to the base frame 1 and the back frame 4. The seat pan 8 is disposed below the front portion of the seat cushion. In addition, the code | symbol 1d of FIG. 1 has shown the spring which supports this seat cushion.

  The occupant protection device 10 includes an inflatable bag 12 disposed on the upper side of the seat pan 8 for pressing the front portion of the seat cushion from the lower side, and a gas generator 14 for inflating the bag 12. And a bag enclosure 16 surrounding the bag 12, and a cover 18 covering the bag 12, the gas generator 14 and the bag enclosure 16.

In this reference example , a recess 20 extending in the width direction (left-right direction) of the seat is provided on the upper surface of the seat pan 8, and in normal times (when an emergency such as a vehicle collision has not occurred) The bag 12 is accommodated in the recess 20 in a state of being folded together with the bag enclosure 16. The bag 12 extends in the left-right direction within the recess 20.

  The bag enclosure 16 has a cylindrical shape that surrounds the outer periphery of the bag 12. The circumferential length of the bag enclosure 16 is smaller than the circumferential length of the bag 12 when inflated in a free state.

  Note that the length of the bag enclosure 16 in the left-right direction (longitudinal direction of the bag 12) may be substantially equal to or shorter than the length from the left end side to the right end side of the bag 12. The length of the bag enclosure 16 in the left-right direction is preferably 40 to 100%, particularly 50 to 90% of the length of the bag 12 in the left-right direction. Only one bag enclosure 16 may be disposed, or a plurality of bag enclosures 16 may be provided at different positions in the longitudinal direction of the bag 12. When a plurality of bag enclosures are provided, it is desirable that the total length of each bag enclosure in the left-right direction be within the above range.

  The bag envelope 16 is preferably made of a material or a structure that does not easily extend in the circumferential direction of the bag envelope 16 or does not extend at all. Moreover, it is preferable that this bag surrounding body 16 has moisture resistance (waterproofness). The bag enclosure 16 may be made of a relatively flexible material such as a cloth material, a synthetic resin sheet, or a synthetic resin mesh sheet, and is made of a hard material such as a metal plate or a metal mesh. Also good.

In this reference example , a rod-shaped gas generator 14 is disposed in the bag 12. The gas generator 14 extends so that the longitudinal direction is the vehicle width direction. The gas generator 14 has a gas ejection port (not shown) on its side peripheral surface, and is configured to eject gas in a radial direction from the gas ejection port.

  A stud bolt 14 a protrudes from the gas generator 14. The stud bolt 14 a protrudes below the seat pan 8 through the lower surface of each of the bag 12 and the bag enclosure 16 and the bottom surface of the recess 20. The stud bolt 14a is fastened to the seat pan 8 by a nut 14b. Accordingly, the gas generator 14, the bag 12, and the bag enclosure 16 are connected to the seat pan 8.

In this reference example , a plurality of stud bolts 14a are protruded at intervals in the longitudinal direction of the gas generator 14, and the gas generator 14, the bag 12 and the bag enclosure are provided by the stud bolts 14a. 16, a plurality of locations are fixed to the seat pan 8 at intervals in the vehicle width direction.

A cover 18 is attached to cover the bag 12, the bag enclosure 16 and the gas generator 14 installed in the recess 20. In this reference example , the cover 18 is a plate having a size that covers the entirety of the recess 20, and a pair of side edges of the cover 18 and the vehicle front side upper edge of the recess 20 and the vehicle, respectively. A bolt 22 and a nut 24 are fastened to the upper edge of the rear side.

  The cover 18 is deformed so as to expand upward following the expansion of the bag 12 when the bag 12 is expanded, or is broken by the expansion force of the bag 12 to allow the bag 12 to expand, Alternatively, it is configured to be detached from the bolt 22 and pushed up by the expansion force of the bag 12.

  In the occupant protection device 10 configured as described above, when a frontal collision of the automobile is detected, the gas generator 14 performs a gas ejection operation, and the bag 12 pushes up the cover 18 by the gas from the gas generator 14 or It expands upward so that it can be pushed away. As a result, the front part of the seat cushion is pushed up or pushed up from below, and the density increases, and forward movement of the occupant's waist is prevented or suppressed.

  At this time, since the bag enclosure 16 is coupled to the seat pan 8, the inflated bag 12 is restrained by the seat pan 8 by the bag enclosure 16. For this reason, when a pressing force is applied to the inflated bag 12 from the waist of the occupant trying to move forward of the vehicle, the forward movement of the bag 12 is prevented or suppressed. The amount of forward movement is small.

In this reference example , since the bag enclosure 16 surrounds from the vicinity of the left end to the vicinity of the right end of the bag 12, the bag 12 has substantially the same size (thickness or cross-sectional area) from the vicinity of the left end to the vicinity of the right end. It expands to become. As a result, the seat cushion is pushed up from below by a substantially equal push-up force from the left side portion to the right side portion.

  Further, since the circumferential length of the bag enclosure 16 is smaller than the circumferential length of the bag 12 when it is inflated freely, when the bag 12 is inflated in a state surrounded by the bag enclosure 16, its maximum size (maximum Diameter) stops at the circumferential length of the bag enclosure 16, and the internal pressure of the bag 12 increases. As a result, the entire bag 12 is inflated sufficiently quickly.

  In this occupant protection device 10, the bag 12, the bag enclosure 16, and the gas generator 14 are normally installed in a recess 20 formed on the upper surface of the seat pan 8. Since 20 is covered with the cover 18, it is prevented that these are damaged by abrasion with a seat cushion or the like. In addition, it is possible to prevent the seat cushion from being deteriorated by the unevenness formed by the bag 12, the bag enclosure 16, the gas generator 14, the recess 20, or the like being bitten into the seat cushion.

FIG. 3 is an exploded perspective view of an occupant protection device according to another reference example , FIG. 4 is a longitudinal sectional view of the occupant protection device, and FIG. 5 is a cross-sectional view taken along line VV in FIG. is there.

In this reference example , the occupant protection device 10A includes a lidless box-shaped retainer 30 disposed on the seat pan 8A, a bag 12A disposed in the retainer 30 in a folded state, and the bag 12A inflated. 14A, the bag 12A and the gas generator 14A are connected to each other, a fixing member 32 fixed to the retainer 30 by a stud bolt 58 described later, and the bag 12A being folded And a cover 18A that is attached to the retainer 30 so as to cover the upper surface opening 30a of the retainer 30.

  The seat pan 8A includes a bottom portion 8a disposed along a lower surface of a seat cushion (not shown), and a pair of side wall portions 8b and 8b provided upright from left and right sides of the bottom portion 8a. Yes. From the upper end part of each side wall part 8b, the flange part 8c protrudes toward the side. The bottom portion 8a has a shape that is concave downward from near the middle in the front-rear direction to the rear. A recess 20A is formed on the upper surface of the bottom 8a, and the retainer 30 is disposed in the recess 20A. The front edge side of the recess 20A is an inclined surface 8d having an upward slope toward the front.

  The retainer 30 has an open top shape with an open top, and has a horizontally long, substantially rectangular parallelepiped shape. The bag 12 </ b> A extends in the left-right direction within the retainer 30. From the front edge and the rear edge of the upper surface opening 30a of the retainer 30, a front support piece 36F and a rear support piece 36B for supporting the retainer 30 with respect to the bottom portion 8a of the seat pan 8A are projected. Further, side support pieces 38, 38 for projecting the retainer 30 to the left and right side walls 8b, 8b of the seat pan 8A are projected from the left and right side edges of the upper surface opening 30a.

  The front support piece 36F extends forward and obliquely upward from the front edge of the upper surface opening 30a of the retainer 30 so as to follow the inclined surface 8d on the front edge side of the recess 20A, and the tip thereof is inclined. Near the top of the surface 8d, it is fixed to the bottom 8a of the seat pan 8 by bolts 40 and nuts 42. 3 indicates a bolt insertion hole provided at the tip of the front support piece 36F, and reference numeral 46 indicates a bolt insertion hole on the bottom 8a side that overlaps the bolt insertion hole 44. .

  The rear support piece 36B extends rearward and obliquely downward from the rear edge of the upper surface opening 30a of the retainer 30, and the front end of the rear support piece 36B is bolt 40 and the bottom part 8a of the seat pan 8 on the rear edge side of the recess 20A. It is fixed by a nut 42. 3 indicates a bolt insertion hole provided at the tip of the rear support piece 36B, and reference numeral 50 indicates a bolt insertion hole on the bottom 8a side that overlaps the bolt insertion hole 48. .

  Each side support piece 38 extends upward from the left and right side edges of the upper surface opening 30a of the retainer 30 so as to follow each side wall 8b of the seat pan 8A. A flange portion 38a protrudes from the front end portion of each side portion support piece 38 toward the side, and this flange portion 38a is superimposed on the upper surface of the flange portion 8c at the upper end portion of each side wall portion 8b. And bolts (not shown).

  The enveloping cloth 34 is cylindrical, and the bag 12A is disposed inside the opening from both ends. The encapsulating cloth 34 is configured to allow expansion of the bag 12A by breaking when the bag 12A is inflated or by expanding following the expansion of the bag 12A.

In this reference example , the left and right ends of the bag 12 </ b> A and the enclosing cloth 34 are connected to the respective side support pieces 38 of the retainer 30. As shown in FIG. 5, connecting pieces 52 for connecting the bag 12A to the side support pieces 38 are provided on the left end side and the right end side of the bag 12A, respectively. As shown in the figure, the connecting piece 52 is provided with a bolt insertion hole (reference numeral omitted).

In this reference example , the distance between both ends in the longitudinal direction of the envelope cloth 34 is larger than the distance between the connecting pieces 52, 52 on both ends of the bag 12A. As shown in FIG. 5, both end portions of the enveloping cloth 34 are folded back to the back side of each connecting piece 52 (the side facing the side support piece 38) on both end sides of the bag 12A. As shown in the figure, the enveloping cloth 34 is also provided with bolt insertion holes (reference numerals omitted) at positions where the both end portions thereof are folded back to the back side of the connection pieces 52 and overlap with the bolt insertion holes of the connection pieces 52. ing.

A contact plate 54 is arranged on the front side of each connecting piece 52 (the side opposite to the side where the end portion of the encapsulation cloth 34 is folded back) via the encapsulation cloth 34. The contact plate 54 is also provided with a bolt insertion hole 54a (FIG. 3) at a position overlapping the bolt insertion hole of each connecting piece 52. In this reference example , the corresponding plate 54 is a U-shaped member that wraps around the left and right sides from the front side of each side support piece 38.

  Each side support piece 38 is also provided with a bolt insertion hole 38 b (FIG. 3) at a position overlapping with the bolt insertion hole of each connection piece 52.

A bolt 56a is inserted into each bolt insertion hole of the abutting plate 54, the enclosing cloth 34, the connecting piece 52, and the side support piece 38, and this bolt 56a is screwed to a nut 56b (FIG. 5). The ends of the bag 12 </ b> A and the enclosing cloth 34 are connected to the side support piece 38. In this reference example , as shown in FIG. 5, the nut 56b is fixed to the back side of the side support piece 38 by welding or the like, but is not limited thereto.

  By this bolting, both end portions of the enclosing cloth 34 are sandwiched between the contact plate 54 and the side support pieces 38 in a folded state. Thereby, both ends of the enclosing cloth 34 are sealed.

Also in this reference example , a rod-like gas generator 14A is arranged in the bag 12A and is connected to the fixing member 32. The fixing member 32 is a plate-like member extending along the bottom surface of the retainer 30, and the bag 12A is pressed against the bottom of the retainer 30 from the inner side of the bag 12A. It is applied to the inner surface of the lower part. A stud bolt 58 protrudes from the lower surface of the fixing member 32. As shown in FIG. 4, the stud bolt 58 is inserted into bolt insertion holes (both of which are abbreviated as reference numerals) provided in the lower part of the bag 12 </ b> A and the enclosing cloth 34 and the bottom surface of the retainer 30. Projects downward. When the nut 60 is tightened to the stud bolt 58, the fixing member 32 is fixed to the retainer 30, and the lower portion of the bag 12A and the enclosing cloth 34 is sandwiched between the fixing member 32 and the bottom surface of the retainer 30. Is done.

The gas generator 14 </ b> A is disposed on the upper surface side of the fixing member 32 so that the longitudinal direction thereof is the left-right direction, and is fixed to the fixing member 32 by a bracket 62. In this reference example , the bracket 62 protrudes from the rear edge of the fixing member 32, and is bent on the upper surface side of the fixing member 32 so as to warp in a C shape, and the C shape. The flange portion 62b extends from the distal end side of the band portion 62a to the fixing member 32 along the upper surface. The stud bolt 58 protrudes downward from the flange portion 62 b and extends through the fixing member 32 and below the fixing member 32. The gas generator 14A is inserted inside the C-shaped band portion 62a, and then the nut 60 is fastened to the stud bolt 58, whereby the flange portion 62b and the fixing member 32 are clamped, and the gas generator 14A is fixed to the fixing member. 32.

  The cover 18 </ b> A has a substantially rectangular plate shape that covers substantially the entire upper surface opening 30 a of the retainer 30. The front edge side of the cover 18A overlaps the upper surface of the front support piece 36F, and the rear edge side overlaps the upper surface of the rear support piece 36B. As shown in FIG. 4, the rear edge side of the cover 18A is fixed to the rear support piece 36B by a bolt 64 and a nut 66. 3 indicates a bolt 64 insertion hole provided on the rear edge side of the cover 18A, and reference numeral 70 indicates a bolt insertion hole on the rear support piece 36B side, which overlaps with the bolt insertion hole 68. ing.

  As shown in FIG. 4, a snap pin 72 projects from the lower surface of the front edge side of the cover 18A. The front edge side of the cover 18A is fastened to the front support piece 36F by elastically engaging the snap pin 72 with a pin engagement hole 74 provided in the front support piece 36F. When the bag 12A is inflated, the snap pin 72 is disengaged from the pin engaging hole 74 by the inflation pressure of the bag 12A, and the cover 18A opens upward in a flap shape with the rear edge side as a fulcrum.

  Also in the occupant protection device 10A configured in this manner, when a frontal collision of the automobile is detected, the gas generator 14A operates to eject gas, and the bag 12A is expanded by the gas from the gas generator 14A. At this time, the encapsulating cloth 34 is pressed in the diameter-expanding direction by the bag 12A and is torn or stretched to allow the bag 12A to expand. The inflating bag 12A expands further upward while pushing open the cover 18A, and pushes up the front part of the seat cushion or pushes it up from below to increase the density of the seat cushion and prevent forward movement of the occupant's waist Or suppress.

In this reference example , forward and obliquely upward from the front edge of the upper surface opening 30a of the retainer 30 so as to follow the upward inclined surface 8d formed on the front edge side of the recess 20A of the seat pan 8A. A front support piece 36F is provided so as to project toward the front. When the bag 12 is inflated, the front support piece 36F faces the bag 12 from the front side. For this reason, even when a very large pressing force is applied to the inflated bag 12 from the occupant's waist to the front, the front support piece 36F receives the bag 12 and moves the bag 12 forward. Stop.

  Even in this occupant protection device 10 </ b> A, the bag 12 </ b> A, the gas generator 14 </ b> A, the fixing member 32, the enveloping cloth 34, and the like disposed in the retainer 30 are normally covered with the cover 18 </ b> A that covers the retainer 30. Therefore, they are prevented from being damaged by rubbing with the seat cushion or the like. Further, it is also possible to prevent the seat cushion from being deteriorated due to the unevenness formed by these members biting into the seat cushion.

  Hereinafter, a procedure for installing the occupant protection device 10A on the seat pan 8A will be described.

  First, the gas generator 14A is inserted into the C-shaped band portion 62a of the fixing member 32, the fixing member 32 is disposed inside the bag 12A, and the stud bolt 58 is externally attached through the bolt insertion hole at the bottom of the bag 12A. To protrude. Next, the bag 12A is folded into an elongated shape, and the enclosing cloth 34 is attached to the folded body of the bag 12A. The stud bolt 58 is also protruded from the bolt insertion hole in the lower part of the enveloping cloth 34.

  Next, the folded body of the bag 12 </ b> A covered with the enveloping cloth 34 is arranged inside the retainer 30. At this time, the stud bolt 58 protruding from the lower portion of the enclosing cloth 34 is inserted into the bolt insertion hole on the bottom surface of the retainer 30. Then, the nut 60 is fastened to the stud bolt 58 from the lower side of the retainer 30 to fix the fixing member 32 to the retainer 30. Further, both end portions of the enveloping cloth 34 are folded back to the back side of each connecting piece 52 of the bag 12A, and in this state, the both end portions of the enclosing cloth 34 and each connecting piece 52 are connected via the contact plate 54. It fastens to each side part support piece 38 with the volt | bolt 56a.

  Thereafter, the cover 18 </ b> A is attached to the retainer 30. Then, the retainer 30 is attached to the seat pan 8A.

  Thus, the bag 12A, the enveloping cloth 34, the gas generator 14A, the fixing member 32, and the cover 18A are attached to the retainer 30 in advance, so that the occupant protection device 10A can be efficiently installed on the seat pan 8A. Can do.

In the reference examples of FIGS. 3 to 5 described above, both end portions of the enclosing cloth 34 are folded back to the back side of the connecting piece 52 and sandwiched between the contact plate 54 and the side support pieces 38 in a folded state. Although both ends of the encapsulating cloth 34 are sealed, the method for sealing both ends of the enclosing cloth 34 is not limited to this. FIG. 6 (a) is a perspective view showing another configuration for sealing both ends of the enclosing cloth, and FIG. 6 (b) is a cross-sectional view taken along line BB in FIG. 6 (a). is there. In FIG. 6, the same reference numerals as those in FIGS. 3 to 5 denote the same parts.

  The envelope cloth 34A shown in FIG. 6 has a cylindrical shape similar to the envelope cloth 34 shown in FIGS. 3 to 5 described above, and the bag 12A is disposed inside the openings at both ends. In this enveloping cloth 34A, the opposite peripheral edges of the openings are overlapped so as to close the openings on both ends, and then the peripheral edges are connected by a connecting means such as stitching or welding. By doing so, the enclosing cloth 34A is sealed. Reference numeral 34a in FIG. 6 (a) indicates bolt 56a insertion holes provided at both end sides of the covering cloth 34A so as to overlap the bolt insertion holes of the connecting pieces 52 of the bag 12A. .

In each of the reference examples in FIGS. 3 to 5 and FIG. 6, the bag enclosure is omitted. However, in these reference examples , the bag enclosure may be provided. In this case, as shown in FIG. 7, the bag enclosure 16 is mounted on the bag 12A in advance, and then the bag 12A with the bag enclosure 16 is disposed in the enclosing cloth 34A. In addition, the code | symbol 52a of FIG. 7 has shown the bolt insertion hole provided in each connection piece 52 of the both ends side of the bag 12A.

  In FIG. 7, the enclosing cloth 34A shown in FIG. 6 is used, but the enclosing cloth 34 shown in FIGS. 5 to 7 may be used.

  In the present invention, the material of the enclosing cloth is not particularly limited. For example, the enclosing cloth is made of various materials such as a base fabric (cloth material), a synthetic resin, and a metal similar to the bag or the bag enclosure. be able to.

Although not shown in the reference examples in FIGS. 3 to 5 and FIG. 6, the structure in which the encasement cloth allows the bag to be inflated when the bag is inflated is not particularly limited. For example, a tear line (scheduled tear line) consisting of perforations, concave grooves, etc. is provided on the enveloping cloth so that when the bag is inflated, the enveloping cloth is torn from the tear line so that the bag is allowed to inflate. Also good. Further, an opening that allows the bag to bulge out may be provided in advance in the enclosing cloth, and this opening may be closed by a closing member in normal times. FIGS. 8 and 9 are perspective views of the covering cloths 34B and 34C provided with such a tear line, respectively, and FIG. 10 is a perspective view of the covering cloth 34D provided with an opening for bag expansion. FIG.

  The enveloping cloth 34B in FIG. 8 has a pair of side tear lines 76a and 76a extending in the front-rear direction along the left and right side edges of the upper surface, and the center of the upper surface in the front-rear direction in the left-right direction. An H-shaped tear line 76 is provided which includes a central tear line 76b extending at both ends and continuing in the vicinity of the middle of each side tear line 76a.

  When a bag (not shown) is inflated inside the enveloping cloth 34B, the upper surface of the enclosing cloth 34B is cleaved into an H shape along each tear line 76a, 76a, 76b by the inflation pressure of the bag. The upper surface is opened. Reference numerals 78a and 78b indicated by two-dot chain lines in FIG. 8 indicate two flaps formed by cleaving the upper surface of the envelope cloth 34B. These flaps 78a and 78b open upward following the expansion of the bag.

  The encased cloth 34C in FIG. 9 has a pair of side tear lines 80a, 80a extending in the front-rear direction along the left and right side edges on the upper surface, and the left-right direction along the rear edge on the upper surface. A U-shaped tear line 80 is provided which has a lateral tear line 80b that extends to the rear end of each side tear line 80a.

  When a bag (not shown) is inflated inside the enveloping cloth 34C, the upper surface of the enclosing cloth 34C is cleaved into a U shape along the tear lines 80a, 80a, and 80b by the inflation pressure of the bag. The upper surface is opened. In FIG. 9, reference numeral 82 indicated by a two-dot chain line indicates a flap formed by cleaving the upper surface of the enclosing cloth 34C. The flap 82 opens upward following the expansion of the bag.

  An opening 84 for allowing the bag to expand when the bag (not shown) is inflated therein is provided in advance on the upper surface of the enclosing cloth 34D in FIG. The opening 84 is normally closed by a closing sheet 86.

  When the bag is inflated inside the enveloping cloth 34D, the closing sheet 86 is detached from the upper surface of the enclosing cloth 34D and the opening 84 is opened by the inflation pressure of the bag. Thereby, the bag is allowed to bulge upward through the opening 84.

In each of the above reference examples , the enveloping cloth is formed in a cylindrical shape in advance, but the configuration of the enclosing cloth is not limited to this. For example, the encapsulating cloth may be configured by winding a flat sheet-like material into a cylindrical shape. FIG. 11 is an explanatory view showing the encapsulating cloth 34E configured as described above, (a) showing the middle of winding of the sheet-like material, and (b) showing the completion of winding. .

  The enveloping cloth 34E is manufactured by winding a sheet-like material 88 made of cloth, a synthetic resin sheet, a metal plate, or the like into a cylindrical shape and overlapping the pair of side edges with a hook 90. ing. In the enveloping cloth 34E, when the bag (not shown) is inflated inside, the hook 90 is released by the inflation pressure of the bag, and the pair of side edges of the sheet-like material 88 are separated from each other. Open on both sides.

  In the present invention, the bag may not have both ends connected to the retainer or the seat pan. FIG. 12 is an exploded perspective view of the occupant protection device 10B configured as described above. In FIG. 12, the same reference numerals as those in FIGS. 3 to 5 denote the same parts.

In this occupant protection device 10B, the bag (not shown) is not provided with connecting pieces on both ends. Moreover, the bolt insertion hole is not provided in the both ends of the covering cloth | cross 34F which covers the folding body of this bag. In this reference example , the envelope cloth 34F has a bag-like shape that completely wraps the folded body of the bag. In this reference example , the retainer 30A that accommodates the bag and the enclosing cloth 34F has a configuration in which the left and right side support pieces 38, 38 are removed from the retainer 30 of FIGS.

  In this occupant protection device 10B, the bag and the enclosing cloth 34F are fixed in the retainer 30A by stud bolts 58 protruding from the lower surface of a fixing member (not shown) disposed in the bag.

  The structure of the contact plate used when the both ends of the bag are connected to the side support pieces of the retainer may be other than those shown in FIGS. FIG. 13 (a) is a perspective view of a contact plate 54A according to another configuration example, and FIG. 13 (b) is a perspective view showing a state in which this contact plate 54A is mounted on a side support piece, FIG. (C) is sectional drawing which follows the CC line of FIG.13 (b). FIG. 14 (a) is a perspective view of a contact plate 54B according to still another configuration example, and FIG. 14 (b) shows a state in which the contact plate 54B is mounted on a side support piece. It is sectional drawing in the part (similar part to FIG.13 (c)) in alignment with the BB line of figure (a).

  The abutting plate 54A of FIG. 13 is substantially U that wraps around from the front side of the side support piece 38 (the side on which the connecting piece 52 provided at the end of the bag is disposed) via one side. It is a letter-shaped member. Reference numerals 34G in FIGS. 13 (b) and 13 (c) denote enveloping cloths enclosing the bag and the connecting pieces 52 on both ends thereof.

  The front side piece 92 of the abutting plate 54A arranged on the front side of the side support piece 38 and the back side piece 94 arranged on the back side of the side support piece 38 are respectively connected to the side support piece 38. Bolt insertion holes 92a and 94a similar to the above-described bolt insertion holes 92a and 94a are provided at positions overlapping the above-described holes for insertion of the bolts 56a (reference numerals omitted in FIG. 13). A nut 56b on which the bolt 56a inserted into the bolt insertion hole 94a is screwed is disposed on the outer surface side of the back side piece portion 94 (on the side opposite to the side facing the side support piece 38). The nut 56b is fixed to the back side piece 94 by welding or the like.

  In connecting the both ends of the bag to the side support piece 38 using the abutment plate 54A, first, the connection piece 52 at the bag end is arranged on the front side of the side support piece 38, and then the front side piece portion. The abutting plate 54A is mounted on the side support piece 38 so that the connecting piece 52 and the side support piece 38 are sandwiched between 92 and the back side piece 94. Thereafter, the bolt 56a is inserted into the nut 56b from the front side of the side support piece 38 through the bolt insertion holes of the front side piece 92, the enclosing cloth 34G, the connecting piece 52, the side support piece 38 and the back side piece 94. Tighten. Accordingly, the connecting piece 52 and the side support piece 38 are clamped by the front side piece portion 92 and the back side piece portion 94, and the connecting piece 52 is fastened to the side support piece 38.

  The other structure of the connection structure to the side support pieces on both sides of the bag using this abutment plate 54A is the same as that of the above-mentioned FIGS. 3-5, and FIG. The same reference numerals denote the same parts.

14 is also a U-shaped member similar to the above-described contact plate 54A, and is disposed on the front side piece 96 disposed on the front side of the side support piece 38 and on the back side of the side support piece 38. The connecting piece 52 at the end of the bag and the side support piece 38 are sandwiched between the back side piece 98 and the back side piece 98 so that the side support piece 38 is mounted. Also in this reference example , the bag and the connecting pieces 52 at both ends thereof are encapsulated by the encapsulating cloth 34G.

  In the abutting plate 54B, only the front side piece 96 is provided with a bolt insertion hole 96a similar to this at a position overlapping with a hole 56a for inserting the bolt 56a of the side support piece 38 (not shown in FIG. 14). Is provided. The nut 56b to which the bolt 56a is screwed is disposed on the back side of the side support piece 38 (between the side support piece 38 and the back side piece 98 of the contact plate 54B). The nut 56b is fixed to the side support piece 38 by welding or the like.

In this reference example , convex portions 96b and 98b are projected from the inner side surfaces of the front side piece portion 96 and the back side piece portion 98 (the surfaces on the opposite sides). The convex portions 96b and 98b are arranged so as to face each other in the vicinity of the front end edges of the front side piece portion 96 and the back side piece portion 98 as shown in FIG. 14 (b).

  As shown in FIG. 14 (b), the protruding height of the convex portion 96b from the inner surface of the front side piece portion 96 is the sum of the connecting piece 52 and the enclosing cloth 34G enclosing the connecting piece 52. Is approximately equal to the thickness. Moreover, the protrusion height from the inner surface of the back side piece part 98 of the convex part 98b is larger than the protrusion height from the back side surface of the side part support piece 38 of the nut 56b. The distance between the tip surfaces of the convex portions 96b and 98b is substantially equal to or slightly smaller than the thickness of the side support piece 38.

  In connecting the both ends of the bag to the side support piece 38 using the abutting plate 56B, first, the connecting piece 52 at the bag end is arranged on the front side of the side support piece 38, and then the front side piece The contact plate 54B is attached to the side support piece 38 so that the connecting piece 52 and the side support piece 38 are sandwiched between the back 96 and the back side piece 98. At this time, the convex portions 96b and 98b protruding from the inner side surfaces of the front side piece portion 96 and the back side piece portion 98 sandwich the side support piece 38, and accordingly, the plate 54B corresponds to the side support piece 38. Temporarily secured. Thereafter, bolts 56a are inserted into the bolt insertion holes of the front side piece 96, the enveloping cloth 34G, the connecting piece 52, and the side support piece 38 from the front side of the side support piece 38, and the back side of the side support piece 38. The nut 56b is tightened. As a result, the connecting piece 52 is pinched by the front piece 96 and the side support piece 38, and the connecting piece 52 is fastened to the side support piece 38.

  The other structure of the connection structure to the side support pieces on both ends of the bag using this abutting plate 54B is the same as that of the above-mentioned FIGS. 3-5, and FIG. 3-5 in FIG. The same reference numerals denote the same parts.

FIG. 16 is an exploded perspective view of an occupant protection device 10C according to an embodiment of the present invention , FIG. 17 is an exploded view (longitudinal sectional view) showing an attachment structure of the occupant protection device 10C to a seat pan, and FIG. FIG. 19 is a top view of the cover of the occupant protection device 10C, and FIG. 20 is a longitudinal cross-sectional view of the occupant protection device 10C when the bag is inflated.

  The occupant protection device 10C includes a horizontally long bag 12 that is folded and disposed on a seat pan 8, a gas generator 14A for inflating the bag 12, and the bag 12 and the gas generator 14A. The fixing member 32 fixed to the seat pan 8 by the stud bolt 58, the enclosing cloth 34 'for enclosing the folded body of the bag 12 so as to restrain the bag 12 in the folded state, and the bag 12 A cover 100 that covers the folded body of the bag 12 and a holding member 110 that holds the folded body of the bag 12 on the cover 100.

  The cover 100 includes a main plate portion 101 disposed on the upper side of the folded body of the bag 12, a surrounding frame portion 102 suspended from the lower surface of the main plate portion 101, and the main plate portion 101 when the bag 12 is inflated. A tear line 103 for cleaving the holding member 110 and a locking claw 104 for locking the holding member 110 to the surrounding frame portion 102. In this embodiment, the main plate portion 101 has a horizontally long substantially rectangular plate shape. The surrounding frame portion 102 has a horizontally long, substantially rectangular cylindrical shape in which each surface extends along the four sides of the main plate portion 101. The peripheral edge portion 101 a of the main plate portion 101 projects outward from the outer periphery of the surrounding frame portion 102. Locking claws 104 project from the outer surfaces of the front and rear wall portions of the surrounding frame portion 102.

  In this embodiment, as shown in FIG. 19, the tear line 103 includes a central tear portion that extends in the left-right direction through the central portion of the main plate portion 101, and a left tear portion and a right portion connected to the left end and the right end of the central tear portion, respectively. And a tear portion. The tear line 103 includes a groove provided on the lower surface of the main plate portion 101. The left tear portion and the right tear portion respectively extend in the front-rear direction (front-rear direction of the seat) along the base end sides of the left and right wall portions of the surrounding frame portion 102. Both ends of the central tear portion join each other in the vicinity of the middle between the left tear portion and the right tear portion. When the bag 12 is inflated, the main plate portion 101 is cleaved along the central tear portion, the left tear portion, and the right tear portion to form two-leaf flaps 106 and 106 (FIG. 20), which open forward and backward, respectively. put out.

  The cover 100 is made of, for example, a synthetic resin such as polypropylene, but is not limited thereto.

  In this embodiment, the holding member 110 is disposed across the lower side of the surrounding frame portion 102 in the front-rear direction. At both ends of the holding member 110, locking pieces 111, 111 are provided respectively that wrap around from the lower side of the surrounding frame portion 102 to the front and rear wall portions of the surrounding frame portion 102. Each locking piece portion 111 is provided with a locking hole 112 with which the locking claw 104 is engaged.

  The holding member 110 is made of, for example, synthetic resin or metal, but is not limited thereto.

  In this embodiment, a recess 20 ′ into which the surrounding frame portion 102 enters is formed on the upper surface of the front portion of the seat pan 8.

  Other configurations of the occupant protection device 10C are the same as those of the occupant protection device 10A described above, and the same reference numerals denote the same parts.

  The assembly procedure of the occupant protection device 10C and the installation procedure on the seat pan 8 will be described below.

  Also in this embodiment, first, the rod-shaped gas generator 14A is connected to the fixing member 32, and the fixing member 32 is arranged inside the bag 12, and from the bolt insertion hole (reference numeral omitted) in the lower portion of the bag 12. The stud bolt 58 of the fixing member 32 is projected outside the bag. Further, the harness 14h for energizing the gas generator 14A is pulled out from the harness outlet (not shown) of the bag 12 to the outside of the bag. Next, the bag 12 is folded into an elongated shape, and the enclosing cloth 34 ′ is attached to the folded body of the bag 12. The stud bolt 58 is also protruded from a bolt insertion hole (not shown) at the lower portion of the enveloping cloth 34 '.

  Next, the folded body of the bag 12 covered with the enclosing cloth 34 ′ is disposed inside the surrounding frame portion 102 of the cover 100. Next, the holding member 110 is disposed so as to cross the lower side of the surrounding frame portion 102, and the locking piece portions 111 at both ends thereof are locked to the locking claws 104. Thereby, the folded body of the bag 12 is supported from the lower side by the holding member 110 and is held in the surrounding frame portion 102.

  Next, the stud bolt 58 protruding below the folded body of the bag 12 is inserted into the bolt insertion hole 8f (FIG. 17) on the bottom surface of the recess 20 ′, and the surrounding frame portion 102 is inserted into the recess 20 ′. Get inside. At this time, the peripheral edge portion 101a of the main plate portion 101 projecting outward from the outer periphery of the surrounding frame portion 102 overlaps the peripheral portion of the recess 20 ′, and the main plate portion 101 covers the recess 20 ′. .

  Thereafter, the nut 60 is fastened to the stud bolt 58 from the lower side of the seat pan 8, and the fixing member 32 is fixed to the bottom of the recess 20 '. As a result, the bag 12 and the lower part of the enclosing cloth 34 'are sandwiched and fixed between the fixing member 32 and the bottom surface of the recess 20'. Further, the peripheral edge portion 101a of the main plate portion 101 is fastened to the seat pan 8 by the rivet 105 through the rivet insertion holes 101b and 8e (FIG. 17). Thereby, the occupant protection device 10 </ b> C is installed on the seat pan 8.

  In this occupant protection device 10C, the folded body of the bag 12 can be held on the cover 100 by the holding member 110 and can be attached to the seat pan 8 together. Easy to attach to

  In this embodiment, since the bag 12 is held in the surrounding frame portion 102, when the cover 100 integrated with the bag 12 is attached to the seat pan 8, the bag 12 directly hits the seat pan 8 or the like. Or being caught.

  Further, in this occupant protection device 10C, the bag 12 is surrounded by the surrounding frame portion 102 and the upper side is covered by the main plate portion 101, so that the bag 12 is not damaged by rubbing or the like. It is sufficiently prevented.

  In this embodiment, since the surrounding frame portion 102 is disposed in the recess 20 ′, the surrounding frame portion 102 and the bag 12, the gas generator 14 </ b> A, etc. inside thereof surround the seat cushion 9 to make the seat comfortable to sit on. It is prevented from deteriorating.

  Further, in this embodiment, the recess 20 ′ is covered with the main plate portion 101, and the peripheral edge portion 101a of the main plate portion 101 is fastened to the peripheral portion of the recess 20 ′ with a rivet 105. Therefore, foreign matter such as water (for example, beverage), dust, and sand particles is prevented from entering the recess 20 ′, and deterioration and damage of the bag 12 due to water, foreign matter and the like are prevented. Instead of the rivet 105, the peripheral edge portion 101a may be fixed to the seat pan 8 with another fixing tool such as a bolt.

  21 to 23 are explanatory views of covers 100A, 100B, and 100C according to other embodiments, respectively, (a) is a top view of the cover, and (b) is (a). It is sectional drawing which follows the BB line of a figure. In addition, (b) figure has shown the time of a bag expansion | swelling (state which the main board part of the cover opened).

  In the cover 100A of FIG. 21, a lateral tear portion extending in the left-right direction along the base end side of the front wall portion of the surrounding frame portion 102, and the base end sides of the left and right wall portions of the surrounding frame portion 102 A tear line 103 </ b> A is provided on the lower surface of the main plate portion 101. The tear line 103 </ b> A includes a left tear portion and a right tear portion whose front ends are connected to the left end and the right end of the lateral tear portion.

  In this cover 100A, when the bag 12 is inflated, as shown in FIG. 21 (b), the main plate portion 101 is cleaved along the front side tear portion, left tear portion and right tear portion, Substantially the entire main plate portion 101 becomes a single leaf flap 106A and opens rearward.

  In the cover 100B of FIG. 22, a lateral tear portion extending in the left-right direction along the proximal end of the rear wall portion of the surrounding frame portion 102, and the proximal ends of the left and right wall portions of the surrounding frame portion 102 A tear line 103B is provided on the lower surface of the main plate portion 101. The tear line 103B extends in the front-rear direction along the side and includes a left tear portion and a right tear portion whose rear ends are connected to the left end and the right end of the lateral tear portion, respectively.

  In this cover 100B, when the bag 12 is inflated, as shown in FIG. 22 (b), the main plate portion 101 is torn along the rear side tear portion, the left tear portion and the right tear portion, Substantially the entire main plate portion 101 becomes a single leaf flap 106B and opens forward.

  In the cover 100C of FIG. 23, two horizontal tear portions extending in the left-right direction along the base end sides of the front and rear walls of the surrounding frame portion 102, and an intermediate between the horizontal tear portions. A tear line 103 </ b> C including a vertical tear portion extending in the front-rear direction so as to connect the portions is provided on the lower surface of the main plate portion 101.

  In this cover 100C, when the bag 12 is inflated, as shown in FIG. 23 (b), the main plate portion 101 is cleaved along the front and rear lateral tear portions and the longitudinal tear portion, and left And right two-leaf flaps 106C and 106C, which are opened to the left and right respectively.

  FIG. 24 is a cross-sectional view of a cover 100D according to still another embodiment, in which FIG. 24 (a) shows a state when the bag is not inflated, and FIG. 24 (b) shows a state when the bag is inflated (the main plate portion of the cover is cleaved). ing.

  In this cover 100D, the main plate portion 101D is curved upward and convex so that the vicinity of the middle portion in the front-rear direction is the highest. In this embodiment, a tear line 103 extending in the left-right direction is provided near the middle in the front-rear direction of the main plate portion 101.

  In the cover 100D, when the bag 12 is inflated, the main plate portion 101 is cleaved along the tear line 103, and the front and rear two-leaf flaps 106D and 106D are opened forward and rearward, respectively. Since each of the flaps 106D and 106D is curved so as to follow the outer surface of the bag 12, as shown in FIG. 24 (b), each flap 106D may bite into the seat cushion and excessively press the seat cushion. Is prevented.

  FIG. 25 is a longitudinal sectional view of an occupant protection device 10E according to another embodiment.

  This occupant protection device 10E is also connected to a horizontally long bag 12 that is folded and disposed on the seat pan 8, a gas generator 14A for inflating the bag 12, and the bag 12 and the gas generator 14A. The fixing member 32 is fixed to the seat pan 8 by the stud bolt 58, and the cover 100 ′ covers the folded body of the bag 12. Even in this form, the cover 100 ′ has a main plate portion 101 disposed on the upper side of the folded body of the bag 12, a surrounding frame portion 102 suspended from the lower surface of the main plate portion 101, and the bag 12 inflated. It sometimes has a tear line 103 for cleaving the main plate portion 101.

  Also in this embodiment, a recess 120 for installing an occupant protection device is provided on the upper surface of the front portion of the seat pan 8, and the surrounding frame portion 102 is disposed in the recess 120. Further, the peripheral edge portion 101 a of the main plate portion 101 projects over the peripheral portion of the recess 120, and is superimposed on the upper surface of the seat pan 8 and fastened with rivets 105.

  In this embodiment, a groove 121 is provided around the bottom surface of the recess 120, and the lower end of the surrounding frame portion 102 enters the groove 121 over the entire circumference.

  Other configurations of the occupant protection device 10E are the same as those of the occupant protection device 10C described above, and the same reference numerals denote the same parts.

  In this occupant protection device 10E, a groove 121 is provided in the peripheral portion of the bottom surface of the recess 120 into which the surrounding frame portion 102 of the cover 100E enters, and the lower end of the surrounding frame portion 102 is inserted into the groove 121. Therefore, even if water flows in along the inner wall portion of the recess 120, the water only accumulates in the groove 121, and the bag 12 is prevented from getting wet.

  As in the occupant protection device 10E ′ of FIG. 26, a groove 121A in which the lower portion of the surrounding frame portion 102 can be closely engaged is provided in the peripheral portion of the bottom surface of the recess 120A into which the surrounding frame portion 102 enters. Thus, it is possible to sufficiently prevent the inflow of water into the recess 120A.

  Each of the above embodiments is an example of the present invention, and the present invention is not limited to the above embodiments.

It is a perspective view of a seat frame provided with a crew member protection device concerning a reference example . It is sectional drawing which follows the II-II line of FIG. It is a disassembled perspective view of the passenger protection device concerning a reference example . It is a longitudinal cross-sectional view of the occupant protection device of FIG. It is sectional drawing which follows the VV line of FIG. It is explanatory drawing which shows another structure for sealing the both ends of the covering cloth. It is a disassembled perspective view of a bag with a bag enclosure and a covering cloth. It is a perspective view which shows the structural example of the enveloping cloth provided with the tear line. It is a perspective view which shows another structural example of the enveloping cloth provided with the tear line. It is a perspective view which shows the structural example of the enveloping cloth provided with the bag expansion | swelling opening. It is explanatory drawing which shows the other structural example of the covering cloth. It is a disassembled perspective view of the passenger protection device concerning a reference example . It is explanatory drawing which shows the other structural example of a contact plate. It is explanatory drawing which shows the other structural example of a contact plate. It is sectional drawing of the passenger | crew protection apparatus which concerns on a prior art example. It is a disassembled perspective view of the passenger protection device concerning one form of the present invention. It is an exploded view which shows the attachment structure to the seat pan of the passenger | crew protection apparatus of FIG. FIG. 17 is a longitudinal sectional view of a seat provided with the occupant protection device of FIG. 16. FIG. 17 is a top view of a cover of the occupant protection device of FIG. 16. It is a longitudinal cross-sectional view at the time of bag expansion | swelling of the passenger | crew protection apparatus of FIG. It is explanatory drawing of another structural example of a cover. It is explanatory drawing of another structural example of a cover. It is explanatory drawing of another structural example of a cover. It is explanatory drawing of another structural example of a cover. It is a longitudinal cross-sectional view of the passenger | crew protection apparatus which concerns on another one form of this invention. It is a longitudinal cross-sectional view of the passenger | crew protection apparatus which concerns on another one form of this invention.

DESCRIPTION OF SYMBOLS 1 Base frame 1a, 1b Side frame 4 Back frame 6 Headrest 8, 8A Seat pan 10, 10A, 10B, 10C, 10E, 10E 'Crew protection device 12, 12A Bag 14, 14A Gas generator 16 Bag enclosure 18, 18A Cover 20, 20A, 20 ', 120, 120A Recess 30 Retainer 32 Fixing member 34, 34A, 34B, 34C, 34D, 34E, 34F Covered cloth 54, 54A, 54B Contact plate 58 Stud bolt 100, 100', 100A , 100B, 100C, 100D Cover 101 Main plate portion 102 Surrounding frame portion 104 Locking claw 121, 121A Groove

Claims (6)

A bag that is disposed below the front portion of the seat cushion and is inflatable to press the front portion of the seat cushion from below;
A gas generator for inflating the bag in a vehicle emergency;
An occupant protection device that covers the bag and has a cover that is pushed and opened by the bag when the bag is inflated;
A recess is provided on the upper surface of the seat pan below the seat cushion, and the bag is disposed in the recess;
The cover is disposed so as to cover the recess,
The cover includes a main plate portion that covers the recess from above, a surrounding frame portion that hangs down from the main plate portion, and a tear portion that is provided on the main plate portion and is torn by being pushed by an inflating bag. ,
The peripheral edge portion of the main plate portion protrudes outward from the outer periphery of the surrounding frame portion, and the peripheral edge portion of the main plate portion is overlapped with the peripheral portion of the recess and fastened to the seat pan.
The occupant protection device, wherein the surrounding frame portion enters the recess, and the bag is disposed inside the surrounding frame portion.   The occupant protection device according to claim 1, wherein a groove in which a lower end of the surrounding frame portion enters is provided at a bottom portion of the recess. Oite to claim 1, wherein the surrounding frame portion and are arranged holding member across the bottom of the bag, the occupant protection both ends of the holding member is characterized in that it is locked to the surrounding frame portion apparatus.   The horizontal tear portion extending in the left-right direction along the base end side of the wall portion on the seat rear side of the surrounding frame portion as the tear portion according to any one of claims 1 to 3. The left and right tear portions extend in the front-rear direction of the seat along the base end sides of the left and right wall portions of the surrounding frame portion, and the rear ends are respectively connected to the left and right ends of the lateral tear portions. A passenger protection device provided with a tear line.   The center tear portion extending in the left-right direction through the central portion of the main plate portion, and the left end and the right end of the central tear portion as the tear portion according to any one of claims 1 to 3. And a tear line comprising a left tear portion and a right tear portion extending in the seat front-rear direction along the base end sides of the left and right wall portions of the surrounding frame portion. Protective device. In any one of Claims 1 thru | or 3, the said main board part is curving convexly upwards so that the intermediate part vicinity of a seat front-back direction may become the highest position,
An occupant protection device according to claim 1, wherein a tear line extending in the left-right direction is provided as the tear portion in the vicinity of the intermediate portion of the main plate portion.

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