JP2008247296A - Leg part restricting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leg part restricting device capable of sufficiently exerting effects of air bag device and seat belt by preventing lower limbs of an occupant from being damaged in a vehicle collision or preventing the position of the body of the occupant from being shifted. <P>SOLUTION: This leg part restricting device is provided with a panel projecting part 11 arranged in a lower inclined form toward the front of the vehicle 1 to a vehicle floor surface in a storage 4a formed in an instrument panel main body 4 of the vehicle 1 to project toward the lower leg parts 9a of the occupant 9, a collision detector 13 for detecting a collision of the vehicle 1, and a projecting part operation means 12 for projecting the panel projecting part 11 from the storage 4a when the collision detector 13 detects the collision of the vehicle 1. By projecting the panel projecting part 11 by the projecting part operation means 12, the movements of the lower legs 9a of the occupant 9 are regulated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is attached to a vehicle such as an automobile and can effectively prevent the occupant's body from sinking into the space of the feet by restraining the occupant's crus at the time of a vehicle collision or the like. The present invention relates to a part restraining device.

  Conventionally, a knee bolster as disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-96510 (Patent Document 1) is known as a device for protecting an occupant's knee from an impact when a vehicle such as an automobile collides. It has been. The knee bolster 124 disclosed in this patent document 1 is provided at the lower part of the instrument panel 118 of the vehicle 110 as shown in FIG. 3, and the passenger 128 seated on the front seat 120. The left and right knees 128A are arranged to face each other.

  The knee bolster 124 includes a lower limb restraining portion 130 that restrains the knee 128A of the occupant 128 from the front side of the vehicle body, and an actuator 132 that horizontally moves the lower limb restraining portion 130 toward the knee 128A of the occupant 128. Yes. The lower limb restraining portion 130 includes a base material 130A and an energy absorbing member 130B disposed on the occupant side of the base material 130A. A connection panel 134 is fixed to the occupant side end of the energy absorbing member 130B. Has been. The connection panel 134 constitutes a part of the general surface 118A of the instrument panel 118.

  The actuator 132 has an inflator 148 and a cylinder (not shown). The actuator 132 generates gas from the inflator 148 and moves the piston rod of the cylinder in the occupant direction, thereby moving the lower limb restraining portion 130 horizontally. The actuator 132 is fixed to a mounting portion 136 </ b> A formed on the instrument panel reinforcement 136 via a bracket 138. In this case, the front wall portion of the bracket 138 is fixed to the mounting portion 136A of the instrument panel reinforcement 136 by a fastening member such as a bolt or a nut, and the actuator 132 is fixed to the lower wall portion of the bracket 138 by the fastening member. Has been.

  The knee bolster 124 includes an acceleration sensor 112 that detects a collision of the vehicle 110, and the acceleration sensor 112 is connected to a control circuit 114 including a microcomputer. In Patent Document 1, the occupant 128 is seated on the front seat 120 and is wearing the seat belt 182. Further, a passenger seat airbag device 176 is disposed on the upper portion 118C of the instrument panel 118, and an inflator 180 for inflating and deploying the airbag bag body 178 of the airbag device 176 is connected to the control circuit 114. ing.

  According to the knee bolster 124 of Patent Document 1 described above, when the vehicle 110 collides, the control circuit 114 first determines whether or not the vehicle 110 has collided based on the input signal from the acceleration sensor 12. . When it is determined by the control circuit 114 that the vehicle 110 has collided, the control circuit 114 operates the inflator 148 of the actuator 132 of the knee bolster 124 and causes the inflator 148 to generate gas.

As a result, the piston rod of the cylinder of the actuator 132 moves linearly in the occupant direction, and the lower limb restraining portion 130 integrally projects with the piston rod 50 toward the knee portion 128A of the occupant 128 to project the knee portion 128A. Therefore, the knee 128A of the occupant 128 seated in the front seat is protected.
JP 2005-96510 A

  Conventionally, it has been performed to further improve the safety of the occupant by performing a simulation when the vehicle collides and examining the behavior of the occupant at the time of the vehicle collision. Also, in such a simulation at the time of a collision, when examining the behavior of the occupant when the occupant collides with the seat belt attached to the front seat of the vehicle, depending on the occupant's posture, the degree of seat belt application, etc., The occupant's body slides over the seat, sinks under the seat belt and sinks, and a phenomenon (submarine phenomenon) is thrown forward from the foot toward the bottom of the instrument panel. Are known.

  Further, in general, in a vehicle such as an automobile, in order to ensure comfortable living, the upper space of the passenger compartment is formed widely, and the foot space provided in front of the lower portion of the seat is also widely formed so as to have a space. Often designed. However, when the knee bolster described in Patent Document 1 is installed on a vehicle having such a wide foot space, for example, when the vehicle collides, the body of the occupant as described above. 3 slips under the seat belt and sinks under the seat belt, the knee bolster 124A of the occupant slips down below the knee bolster 124 in the knee bolster 124 as shown in FIG. There are concerns that will not be adequately protected.

  Further, in this case, if the lower limbs of the occupant are submerged below the knee bolster 124 as described above and the position of the occupant's body is shifted downward, the effect of the seat belt cannot be sufficiently obtained. Moreover, even if the airbag for the driver's seat and the passenger's seat placed at the top of the steering wheel or instrument panel is activated and the airbag bag body is inflated and deployed, the passenger's head is accurately positioned by the airbag bag body. There is also a concern that it is difficult to obtain a sufficient effect of the airbag device because it is not buffered.

  The present invention has been made to solve such conventional problems, and a specific object of the present invention is to prevent an occupant's lower limb from being injured when the vehicle collides. An object of the present invention is to provide an apparatus capable of preventing the position of the occupant's body from slipping under the instrument panel and sufficiently exhibiting the effect of leaving the airbag or seat belt.

  In order to achieve the above object, a crus restraint device provided by the present invention has, as a basic configuration, a housing part formed at a lower part of an instrument panel body of a vehicle. As a part, it is arranged in a form inclined downward toward the front of the vehicle with respect to the vehicle floor surface, and detects a collision when the vehicle collides with a panel protrusion that can protrude toward the occupant's lower leg. A collision detection unit and a projection operation that causes the panel projection to project from the housing unit before the airbag device that detects the vehicle collision and protects the occupant's head is inflated and deployed. The main feature is that the protrusion actuating means regulates the movement of the crus of the occupant by causing the panel protrusion to protrude. In the present invention, the shape of the panel protrusion can be appropriately set as required, such as a flat shape or a three-dimensional shape having a curved surface.

  In the crus restraint device according to the present invention, the collision detection unit includes a collision prediction unit that predicts the collision before the vehicle collision, and the projecting unit actuating unit moves the panel projecting unit forward and backward. When the collision predicting unit predicts the collision of the vehicle, the panel protruding unit protrudes, and when the collision predicting unit determines that the collision of the vehicle is avoided, the panel protruding unit Is preferably retracted to the accommodating portion.

  Further, in the present invention, the panel projecting portion includes a restraining surface disposed to face the crus of the occupant, and an extension that extends in parallel with the restraining surface when the panel projecting portion projects. It is preferable to have a part.

  Further, the panel projecting portion includes the panel projecting portion projecting from the housing portion or the extending portion projecting from the panel projecting portion when the collision detecting unit detects a collision of the vehicle, and the instrument. It is preferable to have a small airbag device that inflates and deploys between the ment panel body.

  A crus restraint device according to the present invention includes a panel protrusion disposed in a form inclined downward toward the front of the vehicle with respect to a vehicle floor surface in a housing portion formed on an instrument panel body, and a vehicle collision. A collision detection unit to detect, and a projecting unit actuating means for projecting the panel projecting unit from the housing unit when the collision detecting unit detects a collision. In addition, the crus restraint device has a foot space provided at a lower portion of the instrument panel main body by causing the protruding portion operating means to protrude the panel protruding portion obliquely downward or downward on the vehicle rear side. The movement of the lower leg of the occupant is restricted.

  According to such a lower leg restraint device of the present invention, when the vehicle collides, the panel protrusion protrudes, thereby effectively protecting the lower leg of the occupant and preventing the lower leg from being injured. In addition, the movement of the crus of the occupant can be restricted and the crus of the occupant can be prevented from moving forward.

  Therefore, for example, even if the occupant's body slips on the seat and tries to dive under the seat belt, the movement of the lower leg of the occupant is restricted, so the position of the occupant's body is shifted on the front seat. Can be prevented. As a result, the effect of the seat belt can be sufficiently obtained, and when the air bag leaving operation is activated, the head of the occupant can be appropriately buffered and supported by the airbag bag body, so that the occupant can be reliably protected. The safety is greatly improved.

  Further, in the crus restraint device of the present invention, the collision detection unit has a collision prediction unit that predicts a vehicle collision, and the projection operation unit supports the panel projection so as to be able to advance and retreat, and the collision prediction unit When the collision of the vehicle is predicted, the panel protrusion is protruded, and when the collision prediction unit determines that the collision of the vehicle is avoided, the panel protrusion is retracted to the accommodating portion. Thereby, when the vehicle actually collides, the panel protruding portion reliably protrudes, so that the movement of the crus of the occupant can be reliably controlled to prevent the position of the occupant's body from shifting.

  Fortunately, if the projecting portion actuating means supports the panel projecting portion so that the panel projecting portion can be moved forward and backward, the panel projecting portion can be returned to the housing portion when the collision is avoided. The thigh restraint device can be used repeatedly. Furthermore, if it is possible to repeatedly use the crus restraint device in this way, for example, if the threshold for projecting the panel protrusion is set low and the possibility of collision is not high, there is a considerable possibility. Since the crus restraint device can be operated, the safety of the occupant can be ensured more reliably.

  Furthermore, in this case, since the crus restraint device of the present invention can be actuated at an early stage before the vehicle collision, it is possible to use, for example, a somewhat slow operating speed as the projecting part actuating means. It becomes possible to configure the protrusion actuating means at low cost. In addition, it is possible to use a collision prediction unit of the collision detection unit that is configured with somewhat low prediction accuracy without using a high-precision and expensive device, thereby reducing manufacturing costs. It becomes.

  In the crus restraint device according to the present invention, the panel projecting portion extends in parallel with the restraint surface disposed facing the crus of the occupant and the restraint surface when the panel projecting portion projects. And an extending portion to be extended. As a result, the protectable area of the lower leg of the occupant is increased, the lower limbs of the occupant can be protected more effectively, and the movement of the lower leg of the occupant can be more reliably regulated.

  The panel protrusion in the present invention includes a panel protrusion protruding from the housing or an extension extending from the panel protrusion when the collision detector detects a vehicle collision, and an instrument panel main body. A small airbag device that inflates and deploys between the two. Therefore, for example, when a small airbag device is provided between the panel protrusion and the instrument panel main body, when the vehicle collides, the protruding panel protrusion and the instrument panel main body are different from each other in a shelf shape. The airbag bag body is inflated and deployed between the two. For this reason, the lower leg portion of the occupant can be buffered and supported by the small airbag device through the panel protruding portion, and the impact force received by the occupant's lower limb can be reduced.

  On the other hand, when the small airbag device is provided between the extension part and the instrument panel body, when the vehicle collides, it is between the back surface of the extension part and the surface of the instrument panel body. Since the airbag body is inflated and deployed, the lower leg of the occupant is more effectively buffered and supported by the small airbag device, and the impact force received by the occupant's lower limb can be greatly reduced.

Hereinafter, preferred embodiments of a crus restraint device according to the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is a cross-sectional view showing a cross section of a vehicle equipped with the crus restraint device of the present embodiment, and FIG. 2 is a main part perspective view schematically showing the configuration of the crus restraint device. FIG.

  In the present embodiment, a front seat (driver's seat) 2 on which a driver (occupant) 9 is seated is arranged in a vehicle 1 of the automobile, and the front seat 2 is provided with a seat belt 3. An instrument panel main body 4 is provided in front of the front seat 2, and a lower portion of the instrument panel main body 4 is provided with an accommodating portion 4 a for accommodating a panel protrusion 11 described later. Is formed with a width dimension substantially equal to the dimension in the width direction of the space portion 20 at the foot.

  A steering column shaft 5 and a steering member 6 that supports and fixes the steering column shaft 5 are disposed inside the instrument panel body 4. The steering member 6 extends along the vehicle width direction, and the left and right ends of the steering member 6 are connected to the left and right side frames of the vehicle body via brackets (not shown).

  A steering wheel 7 is rotatably attached to the rear end portion of the steering column shaft 5, and a column cover 8 is disposed at the base end portion of the steering wheel 7 so as to cover the steering column shaft 5. ing. Further, a driver's seat airbag device (not shown) is mounted on the steering wheel 7.

  In the vehicle 1 having such a configuration, the crus restraint device 10 of the present embodiment holds the panel protrusion 11 disposed in the housing portion 4a of the instrument panel body 4 and the panel protrusion 11 so as to be able to advance and retreat. And a collision detection unit 13 that detects a collision of the vehicle 1.

  The panel protruding portion 11 is formed with a width dimension substantially equal to the width direction dimension of the foot space portion 20 so that the left and right lower leg portions 9a of the occupant 9 can be accurately restrained. When the restraint device 10 is not in operation), as a part of the instrument panel main body 4, the front of the vehicle 9 with respect to the vehicle floor surface is secured in order to secure a wide space 20 at the feet of the passenger 9 seated on the front seat 2. It accommodates in the said accommodating part 4a with the form inclined toward the front downward.

  The panel protruding portion 11 is formed in a substantially flat plate shape by laminating a skin portion on the surface (occupant facing surface) of the core portion, and when the crus 9a of the occupant 9 hits the panel protruding portion 11 The lower leg 9a is prevented from being injured. In this case, although the material of the said core part is not specifically limited, For example, a steel plate, a fiber reinforced plastic, the resin panel which carried out foam blow molding, etc. can be used as a core part. In the present invention, the shape of the panel projecting portion 11 and the shape of the extending portion 14 to be described later are not particularly limited. In addition to the substantially flat plate shape as described above, for example, along the crus of the occupant Thus, it can be formed into a three-dimensional shape having a curved surface, and can be appropriately changed as necessary.

  As the skin portion, a cushion material made of polyurethane foam, polyethylene foam or the like, or a skin material made of thermoplastic polyolefin resin or non-foamed polyurethane resin can be used. Furthermore, in the present invention, the panel protruding portion 11 can be formed, for example, by superposing a resin panel such as polypropylene resin on the core material.

  The panel protrusion 11 extends on the back surface opposite to the facing surface (restraint surface) 11a facing the lower leg 9a of the occupant 9 and extends toward the vehicle front side in parallel with the restraint surface. A portion 14, an extension portion actuating means 15 that supports the extension portion 14 so as to be able to advance and retreat, and a small airbag device 16 disposed at a tip portion of the extension portion 14.

  The extension portion 14 is formed in the same material as the panel protrusion 11 and is formed in a flat plate shape, and is normally accommodated on the back side of the panel protrusion 11. The extension part actuating means 15 receives a signal from the collision detection part 13, extends the extension part 14 to the front side of the vehicle, and extends the extension part 14 to the back side of the panel protruding part 11. It is configured to be moved and accommodated. As a drive source for the extension portion actuating means 15, for example, a step motor, a pneumatic device, a hydraulic device or the like that reversibly operates is used.

  The small airbag device 16 includes an airbag bag body 16a that inflates and deploys between the extended portion 14 extending from the panel protruding portion 11 and the instrument panel body 4, and an airbag bag body 16a that generates gas. The airbag bag body 16a is attached to the back surface side of the extending portion 14 in a state of being flatly folded into a predetermined shape. The inflator 16b is provided at the distal end portion of the extending portion 14, and is configured to operate in response to a signal from the collision detecting portion 13.

  The protrusion actuating means 12 in the crus restraint device 10 of the present embodiment is composed of two left and right cylinder parts 12a provided in parallel and a drive part 12b. The cylinder portion 12a is fixed to the steering member 6 via a bracket 17 and holds the panel protruding portion 11 via a fixture 18 at the tip of the cylinder rod of the cylinder portion 12a. In the present invention, the projecting portion actuating means 12 may be configured using an articulated movable frame structure using a link device instead of the cylinder portion 12a. In addition, as the drive unit 12b, a reversible operating unit such as a step motor, a pneumatic device, or a hydraulic device is used.

  The collision detection unit 13 includes an acceleration sensor that detects the deceleration of the vehicle 1 or an impact sensor that detects an impact of the vehicle 1, and a microcomputer that detects the collision of the vehicle 1 by analyzing the acceleration sensor or the impact sensor. ing. Furthermore, the collision detection unit 13 has a collision prediction unit that predicts the collision before the collision of the vehicle 1, and this collision prediction unit analyzes an image obtained by, for example, a CCD camera or a radar device with a microcomputer. Then, information such as the position and distance of external objects (obstacles) around the vehicle and changes with time are obtained, and the collision of the vehicle 1 is predicted from these information.

  In the present invention, if the collision detection unit 13 can detect the collision of the vehicle 1, the collision prediction unit as described above can be omitted, and the collision prediction unit determines the collision of the vehicle 1. If possible, the arrangement of the acceleration sensor and the impact sensor as described above can be omitted.

  Further, the microcomputer of the collision detecting unit 13 is electrically connected to the projecting part actuating means 12, the extending part actuating means 15, and the small airbag device 16, and when the collision of the vehicle 1 is predicted. When the drive unit 12b of the projecting part actuating means 12 and the drive source of the extension part actuating means 15 are activated and then a collision of the vehicle 1 is detected, the inflator 16b of the small airbag device 16 is actuated to supply gas. It is set to generate. Further, for example, when a collision of the vehicle 1 is detected without predicting a collision of the vehicle 1, the drive unit 12 b of the projecting part actuating unit 12 and the drive source of the extension part actuating unit 15 are activated simultaneously with the small airbag. It is set to activate the inflator 16b of the device 16.

Next, the operation of the crus restraint device 10 when the vehicle 1 collides will be described.
In the crus restraint device 10 of the present embodiment, before the vehicle 1 collides, the collision prediction unit of the collision detection unit 13 detects a sudden approach between the vehicle 1 and an object outside the vehicle, and the collision of the vehicle 1 is predicted. Then, the microcomputer of the collision detection unit 13 activates the driving unit 12b of the projecting part operating unit 12 and the driving source of the extending unit operating unit 15.

  Thereby, the protrusion part operation | movement means 12 makes the panel protrusion part 11 protrude toward the vehicle back diagonally lower side from the accommodating part 4a of the instrument panel main body 4 as shown with a virtual line in FIG. At the same time, the extension portion actuating means 15 extends the extension portion 14 disposed on the back surface of the panel projection portion 11 toward the vehicle front side in parallel with the restraining surface of the panel projection portion 11. As a result, the foot space 20 provided in the lower part of the instrument panel body 4 is narrowed.

  After that, when it is detected by the collision detection unit 13 that the vehicle 1 has collided, the microcomputer of the collision detection unit 13 operates the inflator 16b of the small airbag device 16 to extend the airbag bag body 16a. 14 and the instrument panel body 4 are inflated and deployed.

  Thereby, when the vehicle 1 collides, the panel projecting portion 11 that protrudes and the extended extension portion 14 restrain and protect the lower leg portion 9a of the occupant 9, and the lower limbs of the occupant 9 are injured. Can be prevented. At the same time, the airbag bag body 16a inflated and deployed between the extending portion 14 and the instrument panel main body 4 can effectively cushion and support the lower leg portion 9a, thereby reducing the impact force received by the occupant's lower limbs. it can.

  Further, before the vehicle 1 collides, the panel projecting portion 11 projects and the extending portion 14 extends to narrow the space portion 20 at the foot, so that the movement of the lower leg portion 9a of the occupant 9 occurs at the time of the vehicle collision. It is controlled reliably and it can control that leg part 9a of crew member 9 moves ahead. Accordingly, the body of the occupant 9 can be prevented from sinking under the seat belt, and the position of the body of the occupant 9 can be prevented from shifting on the front seat.

  As a result, the seat belt 3 effectively functions in the event of a vehicle collision, preventing the head and chest of the occupant 9 from hitting the windshield and the handle, and further preventing the occupant 9 from being thrown out of the vehicle. . In addition, since the driver's seat airbag device mounted on the steering wheel 7 is activated, the airbag bag body can accurately cushion and support the head of the occupant, thereby protecting the occupant's safety. Can be greatly improved.

  In the crus restraint device 10 of the present embodiment, after the collision prediction unit of the collision detection unit 13 predicts the collision of the vehicle 1, the panel protruding part 11 protrudes and the extending part 14 extends. When the collision predicting unit determines that the collision of the vehicle 1 has been avoided, the microcomputer of the collision detecting unit 13 is connected to the driving unit 12b of the projecting unit operating unit 12 and the driving source of the extending unit operating unit 15. The extension part 14 is returned to the back surface side of the panel protruding part 11 and accommodated, and the panel protruding part 11 is retracted and accommodated in the accommodating part 4a of the instrument panel main body. As a result, the crus restraint device 10 of the present embodiment can be operated repeatedly without replacement of parts if the vehicle 1 does not collide, so that the cost can be reduced. .

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible as long as it has substantially the same configuration as the present invention and exhibits the same effects. is there. For example, the crus restraint device 10 of the above-described embodiment is disposed on the driver seat side of the front seat 2, but in the present invention, the crus restraint device 10 is also provided on the passenger seat side of the front seat. The crus restraint device having the configuration described above can be provided, and the safety of the passenger seated on the passenger seat side can be greatly improved.

  Further, in the crus restraint device 10, as the driving source of the driving part 12 b of the projecting part actuating means 12 and the driving part 15 of the extending part actuating device as described above is used, In the invention, it is also possible to use an irreversible one such as a pyroactuator (small explosive drive device). In this case, it is preferable that the pyroactuator is arranged so that it can be easily replaced, and the protruding panel protruding portion 11 and the extended extending portion 14 are manually restored to their original positions. This makes it possible to more easily configure the mechanism and structure of the crus restraint device.

  Furthermore, in the said embodiment, the extension part 14 and the small airbag apparatus 16 are distribute | arranged to the back surface of the panel protrusion part 11. FIG. However, in this invention, arrangement | positioning of these extension parts 14 and the small airbag apparatus 16 can be abbreviate | omitted, and a leg part restraint apparatus can also be comprised. That is, the crus restraint device of the present invention is configured so that when the vehicle collides, the panel protruding portion is formed before the driver and passenger airbag devices protecting the occupant's head are completely inflated and deployed. It only needs to be able to protrude into the space at the foot, which can restrain and protect the lower leg of the occupant and restrict the movement of the lower leg to prevent the position of the occupant's body from shifting on the front seat. Can be prevented.

It is sectional drawing which shows the cross section of the vehicle equipped with the leg part restraint device of this invention. It is a principal part perspective view which shows typically the structure of the same leg part constraining apparatus. It is sectional drawing which shows the cross section of the vehicle equipped with the conventional knee bolster.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Front seat 3 Seat belt 4 Instrument panel main body 4a Accommodating part 5 Steering column shaft 6 Steering member 7 Steering wheel 8 Column cover 9 Passenger 9a Lower leg part 10 Lower leg part restraining device 11 Panel protrusion part 12 Projection part operation means 12a cylinder part 12b drive part 13 collision detection part 14 extension part 15 extension part actuating means 16 small airbag device 16a airbag bag body 16b inflator 17 bracket 18 fixing tool 20 space part

Claims (4)

An accommodation portion (4a) formed in a lower portion of the instrument panel body (4) of the vehicle (1) is inclined downward toward the front of the vehicle as a part of the instrument panel body (4). A panel projection (11) that is arranged in the form of the occupant (9) and can project toward the lower leg (9a),
When the vehicle (1) collides, a collision detector (13) that detects the collision;
Before the airbag detecting device (13) detects the collision of the vehicle (1) and protects the head of the occupant (9), the panel protrusion (11) is accommodated in the housing. A projecting portion actuating means (12) projecting from the portion (4a),
The protrusion actuating means (12) restricts the movement of the crus (9a) of the occupant (9) by causing the panel protrusion (11) to protrude.
A crus restraint device characterized by that. The collision detection unit (13) includes a collision prediction unit that predicts the collision before the vehicle (1) collides,
The projecting portion actuating means (12) supports the panel projecting portion (11) so as to advance and retreat,
When the collision prediction unit predicts a collision of the vehicle (1), the panel protrusion (11) protrudes,
When the collision predicting unit determines that the collision of the vehicle (1) has been avoided, the panel projecting portion (11) is retracted to the housing portion (4a).
The lower leg restraint device according to claim 1.   The panel protrusion (11) is parallel to the restraint surface disposed facing the crus (9a) of the occupant (9) and the restraint surface when the panel protrusion (11) projects. The crus restraint device according to claim 1 or 2, further comprising an extension portion (14) extending to the top.   The panel projecting portion (11) is the panel projecting portion (11) projecting from the housing portion (4a) or its panel projecting when the collision detecting unit (13) detects a collision of the vehicle (1). The lower airbag device (16) which expands and deploys between the extension portion (14) extending from the portion (11) and the instrument panel main body (4). Thigh restraint device.

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