JP2005112192A - Seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat for a vehicle having a seat belt capable of reducing the occurrence of submarine phenomenon in frontal crash. <P>SOLUTION: This seat comprises a seat frame 20 on which a cushion for seating is installed. The seat frame 20 comprises a lift up means for pushing up the cushion for seating at the rear part of the cushion when a tension of a specified level or higher is applied to the seat belt 17. The lift up means comprises pivotally moving members 30 and 31 pivotally connected to the seat frame 20 at the rear part, a pivotally moving mechanism 40 for pivotally moving the pivotally moving members 30 and 31, and an operating means 50 operating the pivotally moving mechanism 40 to pivotally move the pivotally moving members 30 and 31 when the tension of the specified level or higher is applied to the seat belt 17. The pivotally moving members 30 and 31 are positioned under the cushion, and push up the cushion by the operation of the pivotally moving mechanism 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle seat provided with a seat belt, and more particularly to a seat that can reduce a submarine phenomenon that occurs during a frontal collision.

  Vehicles and other vehicles are equipped with seat belts to improve the safety of passengers in the event of a frontal collision. The seatbelt is placed diagonally across the occupant's waist from side to side and from the shoulder to the waist, and prevents the occupant from jumping forward in a frontal collision (see, for example, Patent Document 1). reference).

However, immediately after a frontal collision, the occupant has a forward inertial force, so the upper body receives a strong seat belt pressure and at the same time the lower body slides forward on the seated cushion, It slides forward to dive the seat belt (this is called the submarine phenomenon). And the passenger's legs collide with the front part of the car, such as the steering wheel and dashboard in front, or between the front part of the car that was crushed at the time of the frontal collision and the seat. Escape and rescue are difficult.
Japanese Patent Laid-Open No. 10-226295

  For this reason, in the automobile industry, it has become a technical problem to improve the collision safety by reducing the occurrence of submarine phenomenon at the time of a frontal collision.

  Accordingly, an object of the present invention is to provide a vehicle seat equipped with a seat belt that can reduce the occurrence of a submarine phenomenon during a frontal collision.

  A vehicle seat equipped with a seat belt of the present invention includes a seat having a seat frame to which a cushion for seating is attached, a backrest to which a back frame to which a cushion for backrest is attached is attached to the rear portion of the seat frame, and Consists of a headrest attached to the top.

  In order to achieve the above object, the present invention uses a tensile force applied to a seat belt by an occupant's inertial force at the time of a frontal collision to push up the entire seating cushion with respect to its rear part, thereby Prevents slipping in the direction and reduces submarine phenomenon.

  Alternatively, the seat cushion of the seat of the present invention is composed of a peripheral portion having an opening extending from the central portion to the rear portion of the seating cushion, and a seating portion that fits into the opening. In the same manner as above, the front part of the lower body of the occupant starts to slide forward by pushing up only the seating part of the seating cushion with respect to the rear part by using the tensile force applied to the seat belt by the occupant's inertial force at the time of a frontal collision May be prevented and the submarine phenomenon may be reduced.

  The seat frame of the seat according to the present invention is a lift for pushing up the entire seating cushion or only the seating portion of the seating cushion with respect to the rear part of the seating cushion when a tensile force of a predetermined level or more is applied to the seatbelt. Have up means.

  The lift-up means is located below the seating cushion or the seating portion of the seating cushion and has a pivoting member that is long in the front-rear direction with the rear part pivotably connected to the seat frame, the seating cushion as a whole, or for seating A pivot mechanism for pivoting the pivot member so as to push up only the seating portion of the cushion, and so that the pivot member is pivoted when a tensile force exceeding a predetermined level is applied to the seat belt, It comprises an actuating means for actuating the pivot mechanism.

  The pivot mechanism raises the bending / stretching member in a refraction state when a tensile force of a predetermined level or more is applied to the seat belt, and pivots the pivoting member, whereby the entire seating cushion or seating Only the seating part of the cushion is pushed up with respect to the rear part.

  In other words, the pivot mechanism includes a first link rod that is forward of the pivot shaft of the pivot member and has an upper portion pivotably connected to the pivot member in the front-rear direction, and the pivot shaft of the first link rod. The second link rod with the lower part pivotably connected to the seat frame in the front-rear direction, and the lower part of the first link bar and the upper part of the second link bar can be pivoted in the front-rear direction. A bending / stretching member having a connecting portion to be connected is provided. The bending / stretching member is in a refracting state, and when the connecting portion of the bending / stretching member moves in either the forward direction or the rearward direction, the bending / stretching member rises, and the entire cushion for sitting or The pivoting member pivots so as to push up only the seating portion of the seating cushion.

  This pivot mechanism has a left and right rotating shaft that is rotatably attached to the seat frame, and one end pivotally connected to the connecting portion of the bending and stretching member, and the other end pivotable to the outer periphery of the rotating shaft. The connecting shaft further includes a connecting rod, and the rotating shaft of the rotating shaft is located behind the pivot shaft of the pivot member. Further, when the rotating shaft rotates, the connecting rod moves in either the front direction or the rear direction, and moves the connecting portion of the bending / stretching member so as to raise the bending / stretching member.

  Preferably, the bending / stretching member is in a bent state such that the connecting portion connecting the first and second link rods is positioned forward, and when the rotating shaft rotates, the connecting rod moves the connecting portion of the stretching / stretching member in the backward direction. Is moved, i.e. pulled, to raise the bending member.

  Alternatively, the pivot mechanism uses a connecting rod having one end pivotably coupled to the pivot member and the other end pivotally coupled to the outer peripheral portion of the rotating shaft, and has a predetermined level on the seat belt. When the above tensile force is applied, the connecting rod is moved in either the forward direction or the backward direction, and the pivot member is pivoted so that the entire seat cushion or the seat cushion is seated. Only the part is pushed up with respect to the rear part.

  That is, this pivot mechanism is pivotally connected to the pivot member at one end at a position that is off the pivot shaft of the pivot member and the pivot shaft of the pivot member that is attached to the seat frame so as to be rotatable in the left-right direction. It is composed of a connecting rod whose other end is pivotally connected to the outer periphery of the rotating shaft. The rotating shaft of the rotating shaft is located behind the pivoting shaft of the pivot member, and when the rotating shaft rotates, the connecting rod The pivoting member pivots so that it moves in either the forward or rearward direction and pushes up the entire seating cushion or only the seating portion of the seating cushion.

  Preferably, one end of the connecting rod is pivotally connected above the pivot shaft of the pivot member, and when the rotating shaft rotates, the connecting rod moves backward to move the entire seat cushion or seat The pivot member is pivoted so that only the seating portion of the cushion is pushed up with respect to the rear portion.

Actuating means for operating the pivot mechanism to pivot the pivot member when a tensile force of a predetermined level or more is applied to the seat belt is provided at a position off the rotational axis of the rotary shaft. A seat belt anchor to which one end is attached and a temporary fixing means for temporarily stopping the rotation of the rotary shaft until a tensile force of a predetermined level or more is applied to the seat belt.

  The temporary fixing means is composed of a pin fixed to the seat frame at a position deviated from the rotation axis of the rotation shaft and a hole formed in the seat belt anchor so as to surround the outer periphery of the pin, and the seat belt has a predetermined level or more. When the tensile force is applied, the seat belt anchor rotates and the hole is broken by the pin, whereby the temporary fixing means is released, and the rotating shaft rotates together with the seat belt anchor.

  As a modification, the temporary fixing means includes a pin fixed to the seat frame at a position deviated from the rotation axis of the rotary shaft, and a hook-shaped hole formed in the seat belt anchor so as to surround the outer periphery of the pin. When the seat belt is subjected to a tensile force of a predetermined level or more, the seat belt anchor rotates, and the hook-shaped hole is deformed by the pin, thereby releasing the temporary fixing means and rotating together with the seat belt anchor. The shaft rotates.

  Since the present invention is configured as described above, at the time of a frontal collision, the seating cushion or the seating portion thereof is pushed up with respect to the rear part of the seating cushion, thereby restricting the forward movement of the lower body of the occupant. Thus, the occurrence of submarine phenomenon can be reduced.

  7 and 8 show the seat 10 in which the seat belt 17 is attached to the buckle 18 on the seat belt anchor side indicated by reference numeral 17b from the shoulder anchor side indicated by reference numeral 17a. As shown in FIGS. 1, 4, 7, and 8, the seat 10 of the present invention used in a vehicle having such a seat belt 17 is a right frame arranged to face each other with a space in the left-right direction. A seat 11 having a seat cushion on which an occupant is seated is disposed above the seat frame 20 having a left side frame 21b and a left frame 21b, and a back frame (not shown) attached to the rear of the seat frame 20 on the occupant's back. The backrest 15 is attached with a backrest cushion that supports the headrest 16 and the headrest 16 is attached to the top of the backrest 15.

  Preferably, the back frame is attached to the rear of the seat frame 20 via a known reclining mechanism 14.

  As shown in FIGS. 1 to 5, the seat frame 20 is connected to a floor surface (not shown) via a slide mechanism for moving the seat 10 in the front-rear direction.

  As shown well in FIGS. 1 and 4, the right and left frames 21a and 21b of the seat frame 20 are arranged to face each other with a distance substantially corresponding to the width of the cushion for sitting. And right and left upper frames 22a and 22b, and right and left lower frames 23a and 23b having inverted T-shaped cross sections fixed to the lower sides of the right and left upper frames 22a and 22b, respectively. The right frame 21a and the left frame 21b are connected by a plurality of reinforcing members 25, 26, and 27.

  Here, in the illustrated example, the right and left lower frames 23a and 23b are fixed to the lower side of the right and left upper frames 22a and 22b, but are connected to each other by a link member (not shown). The left upper frames 22a and 22b may be made to float up and down.

  The slide mechanism is configured by right and left rails 24a and 24b which are arranged in parallel at a distance substantially corresponding to the width of the seat 10 and spaced from each other in the left-right direction and are fixed on the floor surface in the front-rear direction. The left and right rails 24a and 24b are respectively inserted with slidable sections in the front-rear direction of the right and left lower frames 23a and 23b.

<Embodiment 1> In Embodiment 1 of the seat of the present invention, at the time of a frontal collision, by using the tensile force applied to the seat belt by the occupant's inertial force, the entire seat cushion is pushed up with respect to the rear part. This prevents the occupant's lower body from sliding forward and reduces the submarine phenomenon.

  The seat frame 20 of the seat according to the first embodiment includes lift-up means for pushing up the seating cushion with respect to the rear portion of the seating cushion when a tensile force of a predetermined level or more is applied to the seat belt 17.

  As shown in FIG. 1, FIG. 2A and FIG. 2B, the lift-up means of the first embodiment is located below the seating cushion and is pivotally long in the front-rear direction with the rear part pivotally connected to the seat frame 20. The moving member (subframe indicated by reference numeral 30), the pivot mechanism 40 for pivoting the pivot member so as to push up the seat cushion with respect to the rear part of the seat cushion, and the seat belt 17 have a predetermined level or more. It comprises an actuating means 50 for actuating the pivot mechanism 40 to pivot the pivot member when a tensile force is applied.

  As shown in the drawing, the pivot member is long in the front-rear direction, and the right-side pivot member 32a whose rear portion is pivotally connected to the right upper frame 22a of the seat frame 20 by the pivot pin 33a, and in the front-rear direction. A long, rear portion is pivotally connected to the left upper frame 22b of the seat frame 20 by a pivot pin 33b and has a left pivot member 32b that pivots coaxially with the pivot axis of the right pivot member 32a. The right and left pivot members 32a and 32b are composed of subframes 30 connected by reinforcing members 28 and 28.

  The pivot mechanism 40 is provided on the left and right pivot pins (denoted by reference numerals 33a and 33b) of the rotation shaft 41 that is attached to the seat frame 20 so as to be rotatable in the left-right direction and the pivot shaft of the subframe 30 (the pivot member). A connecting rod having one end pivotally coupled to the pivot member 30 and the other end pivotally coupled to the outer periphery of the rotating shaft 41 (only the right coupling rod denoted by reference numeral 43a) at a position deviated from The rotation shaft of the rotary shaft 41 is located behind the pivot shafts 33a and 33b of the subframe 30. In the illustrated example, when the rotary shaft 41 rotates in the direction of arrow R, the connecting rod moves in the rearward direction indicated by arrow T, and the subframe 30 is pivoted so as to push up the seating cushion in the direction of arrow W. Move. Here, when the rotary shaft 41 rotates, the connecting rod moves in the forward direction (the direction opposite to the arrow T), and the subframe 30 is pivoted so as to push up the seating cushion in the direction of the arrow W. Also good.

  There may be one connecting rod or a plurality of connecting rods. Preferably, the right and left connecting rods (right connection shown by reference numeral 43a) are connected to the rotary shaft 41 so as to be pivotable with a space left and right. Two bars are used (only the bar is shown).

  One end of each of the right and left connecting rods pivots to the right and left pivot members 32a and 32b of the subframe 30 at positions off the pivot shafts 33a and 33b of the subframe 30, respectively, as shown. Connected as possible.

  The other ends of the right connecting rod 43a and the left connecting rod are respectively shown on the right and left arms (only the right arm shown by reference numeral 42a) fixed on the outer peripheral surface of the rotating shaft 41, as shown. ) To be pivotally connected. In the illustrated example, the right arm 42a and the left arm extend long from the outer peripheral surface of the rotary shaft 41 slightly forward and downward, and the right connecting rod 43a and the left connecting rod are substantially at the ends of the right arm 42a and the left arm. When the seat belt 17 is pulled in the direction of the arrow F shown in FIG. 6B, the rotary shaft 41 rotates in the direction of the arrow R, and the right connecting rod 43a and the left connecting rod are moved to the arrow T. Move backward as indicated by. Here, when the right connecting rod 43a and the left connecting rod are moved in the forward direction (the direction opposite to the arrow T), the right arm 42a and the left arm are extended from the outer peripheral surface of the rotary shaft 41 to the front and slightly upward. It only has to be fixed on the outer peripheral surface of the rotating shaft 41.

  As shown in FIGS. 1, 2A, 2B, 6A and 6B, the actuating means 50 is fixed to the rotating shaft 41 and attaches one end of the seat belt 17 to a position off the rotating shaft of the rotating shaft 41. The belt anchor 51 and the seat belt 17 are constituted by temporary fixing means for temporarily stopping the rotation of the rotary shaft 41 until a tensile force of a predetermined level or higher is applied.

  As shown in FIGS. 6A and 6B, the seat belt anchor 51 is made of a substantially L-shaped plate, and has an attachment portion 52 for attaching one end of the seat belt 17 to one end thereof. When the seat belt 17 is pulled in the direction of the arrow F when the seat belt 17 is pulled in the direction of the arrow F in a position deviating from the rotation axis of the rotation shaft 41 (in the illustrated example, above the rotation axis), as shown in FIGS. The rotary shaft 41 rotates in the direction of the arrow R together with the belt anchor 51, and as described above, the right connecting rod 43a and the left connecting rod connected to the right arm 42a and the left arm are in the rearward direction indicated by the arrow T. As a result, the subframe 30 pivots in the direction of the arrow W, whereby the front side of the seating cushion is pushed upwards with respect to the rear part.

  As shown in the drawing, the temporary fixing means includes a pin 54 fixed to the left lower frame 23b of the seat frame 20 at a position deviated from the rotation axis of the rotation shaft 41 (in the illustrated example, behind the rotation axis), and a pin 54 54 is formed of a hook-shaped hole 53 formed in the seat belt anchor 51 so as to surround the outer periphery of the seat belt anchor 51. When a tensile force of a predetermined level or more is applied to the seat belt 17, the seat belt anchor 51 is moved in the direction of the arrow R. By rotating, the hook-shaped hole 53 is deformed by the pin 54, whereby the temporary fixing means is released, and the rotating shaft 41 rotates in the direction of the arrow R together with the seat belt anchor 51.

  As a modification, the temporary fixing means includes a pin 54 fixed to the left lower frame 23b of the seat frame 20 and a seat belt anchor 51 so as to surround the outer periphery of the pin 54 at a position deviated from the rotation axis of the rotary shaft 41. The seat belt anchor 51 rotates in the direction of arrow R when the seat belt 17 is subjected to a tensile force of a predetermined level or more, and the hole is broken by the pin 54. Thus, the temporary fixing means is released, and the rotating shaft 41 rotates in the direction of the arrow R together with the seat belt anchor 51. Such destruction of the hole can be achieved by appropriately changing the material and thickness around the hole.

  The actuating means 50 is further composed of restricting means for restricting the rotation of the rotary shaft 41 in the direction of the arrow R, and this restricting means comprises a plate 55 having a substantially inverted L-shaped cross section fixed to the left lower frame 23b. The seat belt anchor 51 is received between the plate 55 and the left lower frame 23b. This prevents the seating cushion from being pushed up excessively.

<Embodiment 2> In Embodiment 2 of the seat of the present invention, the front cushion is pushed up with respect to the rear part by using the tensile force applied to the seat belt by the occupant's inertial force at the time of a frontal collision. This prevents the occupant's lower body from sliding forward and reduces the submarine phenomenon.

  The seat frame 20 has lift-up means for pushing up the seating cushion with respect to the rear part of the seating cushion when a tensile force of a predetermined level or more is applied to the seat belt 17.

  As shown in FIGS. 3A and 3B, the lift-up means according to the second embodiment is located below the seating cushion, and has a pivoting member that is long in the front-rear direction and has a rear part that is pivotally connected to the seat frame (above-mentioned). 3A and 3B, which is substantially the same configuration as the subframe 30 of the first embodiment, and the pivot member so as to push up the seating cushion with respect to the rear portion of the seating cushion. And an actuating means for actuating the pivot mechanism 40 so as to pivot the pivot member when a tensile force of a predetermined level or more is applied to the seat belt 17. The configuration is substantially the same as the operation means 50 of the first embodiment.

  As shown in the figure, the pivot member is long in the front-rear direction, and the right-side pivot member 32a whose rear portion is pivotally connected to the right upper frame 22a of the seat frame 10 by the pivot pin 33a, and in the front-rear direction. A left pivot member having a long rear portion and pivotally connected to a left upper frame (not shown) of the seat frame 10 by a pivot pin and pivoting coaxially with the pivot shaft of the right pivot member 32a. And a subframe 30 in which the right pivot member 32a and the left pivot member are connected by a reinforcing member (not shown).

  As shown in the figure, the pivot mechanism 40 can be pivoted forward and backward with respect to the pivot frame, that is, in front of the pivot axis of the sub-frame 30 (the position of the pivot pin indicated by the reference numeral 33a) and the upper part thereof in the sub-frame 30. The first link rod 45 connected to the first link rod 45 is directly below the pivot shaft of the first link rod 45, and the lower portion can be pivoted in the front-rear direction to the seat frame 20 (right upper frame 22a in the illustrated example). The second link rod 46 is connected, and the bending member 44 includes a connecting portion 47 that connects the lower portion of the first link rod 45 and the upper portion of the second link rod 46 so as to be pivotable in the front-rear direction.

  The bending / stretching member 44 configured in this manner is attached to each of the right frame 21a and the left frame 21b of the seat frame 20, and each of the connecting portions of the right and left bending members (only the right connecting portion 47 is shown). Are pivotally connected by a connecting shaft (not shown).

  In the illustrated example, the right-side bending member 44 and the left-side bending member are in a bent state, and when the connecting portion 47 moves in the backward direction indicated by the arrow T, the bending member 44 rises as shown in FIG. The moving member or subframe 30 pivots in the direction of arrow W to push up the seating cushion with respect to the rear of the seating cushion. Here, although not illustrated, these right and left bending / stretching members 44 in a refracting state are raised when the connecting portion 47 moves in the forward direction (the direction opposite to the arrow T), and the bending member 44 rises. The (subframe 30) may pivot in the direction of the arrow W so as to push up the seating cushion with respect to the rear part of the seating cushion.

  The pivot mechanism 40 is further connected to the seat frame 20 so as to be rotatable in the left-right direction, and one end of the pivot mechanism 40 is pivotally connected to the connecting portion 47 of the bending member 44, and the other end of the rotary shaft 41 is connected. It has a connecting rod (only the right connecting rod shown by reference numeral 43a) connected to the outer periphery in a pivotable manner, and the rotation shaft of the rotary shaft 41 is the pivot shaft (shown by reference numeral 33a) of the pivot member 30. Position behind the pivot pin). When the rotary shaft 41 rotates in the direction of the arrow R, the connecting rod 43a moves in the rearward direction indicated by the arrow T, and the connecting portion 47 moves in the rearward direction indicated by the arrow T so as to raise the bending / stretching member 44. . Here, when the rotary shaft 41 rotates, the connecting rod 43a may move in the forward direction (the direction opposite to the arrow T) to raise the bending / stretching member 44.

  There may be one connecting rod or a plurality of connecting rods. Preferably, two right and left connecting rods that are pivotally connected to the rotating shaft 41 at right and left intervals are used. (Only the right connecting rod 43a is shown in FIGS. 3A and 3B).

  The right connecting rod 43a and the left connecting rod (not shown) are pivotally connected to the right arm 42a and the left arm (not shown) fixed on the outer peripheral surface of the rotating shaft 41, respectively, as shown. Is done. In the illustrated example, the right arm 42a and the left arm extend long from the outer peripheral surface of the rotary shaft 41 slightly forward and downward, and the right connecting rod 43a and the left connecting rod are substantially at the ends of the right arm 42a and the left arm. When the seat belt 17 is pulled in the direction of the arrow F shown in FIG. 6B, the rotary shaft 41 rotates in the direction of the arrow R, and the right side connecting rod 43a and the left side connecting rod are indicated by the arrow T. Move backwards as shown. Here, when moving the right connecting rod 43a and the left connecting rod in the forward direction (the direction opposite to the arrow T), although not illustrated, the right arm 42a and the left arm are directed slightly upward from the outer peripheral surface of the rotary shaft 41. What is necessary is just to fix on the outer peripheral surface of the rotating shaft 41 so that it may extend long.

  The seat actuation means of the second embodiment has substantially the same configuration as the seat actuation means 50 of the first embodiment shown in FIGS. 6A and 6B.

  That is, the seat actuating means 50 of the second embodiment is fixed to the rotating shaft 41, and the seat belt anchor 51 for attaching one end of the seat belt 17 to a position deviated from the rotating shaft of the rotating shaft 41, and the seat belt 17 with a predetermined It is comprised from the temporary fix | stop means for temporarily stopping rotation of the rotating shaft 41 until the tensile force more than a level is applied.

  As shown in FIGS. 6A and 6B, the seat belt anchor 51 is made of a substantially L-shaped plate, and has an attachment portion 52 for attaching one end of the seat belt 17 to one end thereof. When the seat belt 17 is pulled in the direction of arrow F when the seat belt 17 is pulled in the direction of the arrow F in a position deviating from the rotation axis of the rotation shaft 41 (in the illustrated example, above the rotation axis), as shown in FIGS. The rotating shaft 41 rotates in the direction of the arrow R together with the anchor 51, and the right connecting rod 43a and the left connecting rod connected to the right arm 42a and the left arm move in the rearward direction indicated by the arrow T, and the bending member 44 Rises and the subframe 30 pivots in the direction of arrow W, thereby pushing up the front side of the seating cushion with respect to its rear.

  As shown in the figure, the temporary fixing means surrounds the pin 54 fixed to the seat frame 20 and the outer periphery of the pin 54 at a position deviated from the rotation axis of the rotation shaft 41 (in the illustrated example, behind the rotation axis). Further, the seat belt anchor 51 is formed of a hook-shaped hole 53, and when the seat belt 17 is subjected to a tensile force of a predetermined level or more, the seat belt anchor 51 rotates in the direction of the arrow R, and the hook-shaped hole 53 is formed. The hole 53 is deformed by the pin 54, whereby the temporary fixing means is released, and the rotation shaft 41 rotates in the direction of the arrow R together with the seat belt anchor 51.

  As a modification, the temporary fixing means is formed in the seat belt anchor 51 so as to surround the pin 54 fixed to the seat frame 20 and the outer periphery of the pin 54 at a position deviated from the rotation axis of the rotation shaft 41. The seat belt anchor 51 is rotated in the direction of arrow R when the seat belt 17 is subjected to a tensile force of a predetermined level or more, and the hole is broken by the pin 54. The stopping means is released, and the rotary shaft 41 rotates in the direction of arrow R together with the seat belt anchor 51. Such destruction of the hole can be achieved by appropriately changing the material and thickness around the hole.

  The actuating means 50 is further constituted by restricting means for restricting the rotation of the rotary shaft 41, and this restricting means comprises a plate 55 having a substantially inverted L-shaped cross section fixed to the left lower frame 23b. 51 is received between the plate 55 and the left lower frame 23b. This prevents the seating cushion from being pushed up excessively.

<Embodiment 3> In Embodiment 3 of the seat of the present invention, at the time of a frontal collision, only the seating portion of the seating cushion is pushed up with respect to the rear portion by using the tensile force applied to the seat belt by the inertial force of the occupant. This prevents the occupant's lower body from sliding forward and reduces the submarine phenomenon.

  As shown in FIG. 8, in the third embodiment, the sitting cushion includes a peripheral portion 12 having an opening extending from the central portion to the rear portion of the sitting cushion, and a sitting portion 13 fitted into the opening. Such a cushion can be produced separately from the peripheral portion 12 and the seating portion 13 by known molding techniques.

  The seat frame 20 of the seat according to the third embodiment lifts up only the seat portion 13 of the seat cushion with respect to the rear portion of the seat cushion when a tensile force of a predetermined level or more is applied to the seat belt 17. Have means.

  As shown in FIGS. 4, 5A and 5B, the lift-up means according to the third embodiment is located below the seating portion 13 of the seating cushion and is connected to the seat frame 20 so that the rear part is pivotally movable. A pivot member (subframe indicated by reference numeral 31) which is long in the direction, a pivot mechanism 40 for pivoting the pivot member so as to push up the seat portion 13 with respect to the rear portion of the seat cushion, and a predetermined seat belt 17 It comprises an actuating means 50 for actuating the pivot mechanism 40 so as to pivot the pivot member when a tensile force exceeding the level is applied.

  As shown in the figure, the pivot member is positioned below the seating portion 13 of the seating cushion, is long in the front-rear direction, and its rear portion can be pivoted to the right upper frame 22a of the seat frame 20 by the pivot pin 33a. Is located below the seating portion 13 of the seat cushion and the right pivot member 32a connected to the seat frame 20 and is long in the front-rear direction. The rear portion pivots on the left upper frame 22b of the seat frame 20 by the pivot pin 33b. The left pivot member 32b is connected to the right pivot member 32a so as to be coaxial with the pivot shaft of the right pivot member 32a. The reinforcing members 25, 26, and 27 are provided between the right pivot member 32a and the left pivot member 32b. It is composed of connected subframes 31.

  As described above, the pivot member of the seat 10 according to the third embodiment, that is, the subframe 31, is sized such that the size of the subframe 30 of the seat 10 according to the first embodiment can be pivoted only on the seating portion 13. Is. When the tensile force of a predetermined level or more is applied to the pivot mechanism 40 for pivoting the pivot member of the seat 10 of the third embodiment, that is, the sub frame 31, and the seat belt 17, the sub frame 31 is The structure of the actuating means 50 for actuating the pivot mechanism 40 so as to pivot is substantially the same as the structure of the pivot mechanism 40 and the actuating means 50 of the seat of the first embodiment as described below. It is in.

  That is, the pivot mechanism 40 of the third embodiment has one end at a position off the pivot shaft of the pivot member, that is, the subframe 31, and the rotation shaft 41 that is rotatably attached to the seat frame 20 in the left-right direction. It is composed of a coupling rod (only the right coupling rod 43a is shown) which is pivotally coupled to the subframe 31 and whose other end is pivotally coupled to the outer periphery of the rotation shaft 41. The sub-frame 31 is located behind the pivot axis (positions of the pivot pins 33a and 33b). In the illustrated example, when the rotary shaft 41 rotates, the right connecting rod 43a and the left connecting rod move in the rearward direction indicated by the arrow T, and the subframe 31 is pivoted so as to push up the sitting cushion. Here, when the rotating shaft 41 rotates, the right connecting rod 43a and the left connecting rod move in the forward direction (the direction opposite to the arrow T), and the subframe 31 is pivoted so as to push up the sitting cushion. May be.

  There may be one connecting rod or a plurality of connecting rods. Preferably, two connecting rods, that is, a right connecting rod and a left connecting rod which are pivotally connected to the rotating shaft with a space left and right are used.

  As shown in the drawing, one end of each of the right and left connecting rods is located on the right and left pivot members 32a and 32b of the subframe 31 at a position deviated from the pivot axis of the subframe 31 (in the illustrated example, the pivot is pivoted). (Above the shaft) is pivotally connected.

  The other ends of the right connecting rod 43a and the left connecting rod are pivotally connected to a right arm 42a and a left arm (not shown) fixed on the outer peripheral surface of the rotating shaft 41, respectively, as shown in the figure. Is done. In the illustrated example, the right arm 42a and the left arm extend long from the outer peripheral surface of the rotary shaft 41 slightly forward and downward, and the right connecting rod 43a and the left connecting rod are substantially at the ends of the right arm 42a and the left arm. When the seat belt 17 is pulled in the direction of the arrow F shown in FIG. 6B, the rotary shaft 41 rotates in the direction of the arrow R, and the right side connecting rod 43a and the left side connecting rod are indicated by the arrow T. Move backwards as shown. Here, although not illustrated, when the right connecting rod 43a and the left connecting rod are moved in the forward direction (the direction opposite to the arrow T), the right arm 42a and the left arm are moved slightly upward in the forward direction from the outer peripheral surface of the rotary shaft 41. What is necessary is just to fix on the outer peripheral surface of the rotating shaft 41 so that it may extend long.

  The actuating means 50 is fixed to the rotating shaft 41, until the seat belt anchor 51 for attaching one end of the seat belt 17 to a position deviated from the rotating shaft of the rotating shaft 41, and a tensile force of a predetermined level or more is applied to the seat belt 17. It is comprised from the temporary fix | stop means for temporarily stopping rotation of the rotating shaft 41.

  As shown in FIGS. 6A and 6B, the seat belt anchor 51 is made of a substantially L-shaped plate, and has an attachment portion 52 for attaching one end of the seat belt 17 to one end thereof. As shown in the figure, when the seat belt 17 is pulled in the direction of arrow F when the seat belt 17 is at a position deviating from the rotation axis of the rotation shaft 41 (above the rotation axis in the example shown in the figure), The rotating shaft 41 rotates in the direction of the arrow R, the right connecting rod 43a and the left connecting rod move in the rear direction indicated by the arrow T, and the subframe 31 pivots in the direction of the arrow W. The front side of the cushion is pushed upward with respect to the rear part.

  As shown in the drawing, the temporary fixing means is a hook 54 formed on the seat belt anchor 51 so as to surround the pin 54 fixed to the seat frame 20 and the outer periphery of the pin 54 at a position deviated from the rotation axis of the rotation shaft 41. The seat belt anchor 51 rotates in the direction of arrow R when the seat belt 17 is subjected to a tensile force of a predetermined level or more, and the hook-shaped hole 53 is deformed by the pin 54. Thus, the temporary fixing means is released, and the rotating shaft 41 rotates together with the seat belt anchor 51.

  As a modification, the temporary fixing means is formed in the seat belt anchor 51 so as to surround the pin 54 fixed to the seat frame 20 and the outer periphery of the pin 54 at a position deviated from the rotation axis of the rotation shaft 41. The seat belt anchor 51 is rotated in the direction of arrow R when the seat belt 17 is subjected to a tensile force of a predetermined level or more, and the hole is broken by the pin 54. The stopping means is released, and the rotating shaft 41 rotates together with the seat belt anchor 51. Such destruction of the hole can be achieved by appropriately changing the material and thickness around the hole.

  The actuating means 50 is further constituted by restricting means for restricting the rotation of the rotary shaft 41, and this restricting means comprises a plate 55 having a substantially inverted L-shaped cross section fixed to the left lower frame 23b. 51 is received between the plate 55 and the left lower frame 23b. This prevents the seating cushion from being pushed up excessively.

  Although the present invention has been described by taking an automobile seat as an example, the present invention can also be used for a vehicle seat provided with a seat belt, for example, an aircraft seat.

FIG. 1 is a perspective view of a seat frame according to Embodiment 1 of the present invention. 2A and 2B are sectional views of the seat frame according to Embodiment 1 of the present invention. 3A and 3B are sectional views of the seat frame according to the second embodiment of the present invention. FIG. 4 is a perspective view of a seat frame according to the third embodiment of the present invention. 5A and 5B are sectional views of the seat frame according to Embodiment 3 of the present invention. 6A and 6B show a seat belt anchor. FIG. 7 is a perspective view of the seat according to Embodiments 1 and 2 of the present invention. FIG. 8 is a perspective view of a seat according to the third embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Seat 11 ... Seat 12 ... Surrounding part 13 ... Seating part 14 ... Reclining mechanism 15 ... Backrest 16 ... Headrest 17 ... Seat belt 17a ... Shoulder Anchor side portion 17b ... Seat anchor side portion 18 ... Buckle 20 ... Seat frame 21a ... Right frame 21b ... Left frame 22a ... Right upper frame 22b ... Left upper frame 23a ... right lower frame 23b ... left lower frame 24a ... right rail 24b ... left rails 25, 26, 27, 28, 29 ... reinforcement 30 ... Embodiments 1 and 2 Subframe 31 of the third embodiment 32a ... right pivot member 32b ... left pivot member 33a ... Right pivot pin 33b ... Left pivot pin 40 ... Pivot mechanism 41 ... Rotating shaft 42a ... Right arm 43a ... Right connecting rod 44 ... Flexible member 45 ... First Link rod 46 ... Second link rod 47 ... Connection portion 50 ... Actuating means 51 ... Seat belt anchor 52 ... Mounting portion 53 ... Hook-shaped hole 54 ... Pin 55 ... Plate

Claims (13)

A vehicle seat with a seat belt,
A seat having a seat frame fitted with a cushion for sitting;
A backrest with a back frame attached with a backrest cushion attached to the rear of the seat frame, and a headrest attached to the top of the backrest;
Consisting of
The seat frame is
A lift-up means for pushing up the seat cushion with respect to a rear portion of the seat cushion when a tensile force of a predetermined level or more is applied to the seat belt;
But the seat. The lift-up means
A pivot member located below the seating cushion and having a rear portion pivotably connected to the seat frame;
A pivot mechanism for pivoting the pivot member so as to push up the seat cushion with respect to a rear portion of the seat cushion, and when a tensile force of a predetermined level or more is applied to the seat belt, An actuating means for actuating the pivot mechanism to pivot the pivot member;
Consisting of,
However, the seat of claim 1. The pivot mechanism is
A first link rod that is forward of the pivot shaft of the pivot member and has an upper portion pivotably connected to the pivot member in the front-rear direction, substantially directly below the pivot shaft of the first link rod, A second link bar having a lower part pivotally connected to the seat frame in the front-rear direction, and a lower part of the first link bar and an upper part of the second link bar are pivotably connected in the front-rear direction. A bending / stretching member having a connecting portion, wherein the bending / stretching member is in a refractive state, and when the connecting portion moves in either the front direction or the rearward direction, the bending / stretching member rises, and the pivoting member is A flexion and extension member pivoting to push up the seating cushion with respect to the rear of the seating cushion;
A rotating shaft that is rotatably attached to the seat frame in the left-right direction, the rotating shaft of the rotating shaft being located behind the pivot shaft of the pivot member, and one end of the bending member The connecting rod is pivotally connected to the connecting portion, and the other end is pivotally connected to the outer peripheral portion of the rotating shaft. When the rotating shaft rotates, the connecting rod moves forward or backward. A connecting rod that moves in either direction to move the connecting part so as to raise the bending and stretching member;
Consisting of
The actuating means is
A seat belt anchor that is fixed to the rotating shaft and attaches one end of the seat belt to a position off the rotating shaft of the rotating shaft, and the rotating shaft is temporarily rotated until a tensile force exceeding a predetermined level is applied to the seat belt. Temporary fixing means to stop,
Consisting of,
However, the seat of claim 2. The temporary fixing means is
A pin fixed to the seat frame at a position deviating from the rotation axis of the rotation shaft, and a hole formed in the seat belt anchor so as to surround an outer periphery of the pin;
Consisting of
When a tensile force of a predetermined level or more is applied to the seat belt, the seat belt anchor rotates and the hole is broken by the pin, whereby the temporary fixing means is released, and the seat belt anchor And the rotating shaft rotates,
However, the seat of claim 3. The temporary fixing means is
A pin fixed to the seat frame at a position off the rotation axis of the rotation shaft, and a hook-shaped hole formed in the seat belt anchor so as to surround the outer periphery of the pin;
Consisting of
When a tensile force of a predetermined level or more is applied to the seat belt, the seat belt anchor rotates, and the hook-shaped hole is deformed by the pin, thereby releasing the temporary fixing means, The rotating shaft rotates together with the seat belt anchor.
However, the seat of claim 3. The pivot mechanism is
A rotating shaft that is attached to the seat frame so as to be rotatable in the left-right direction, the rotating shaft of the rotating shaft being located behind the pivot shaft of the pivot member, and the pivot member A connecting rod having one end pivotably connected to the pivot member and the other end pivotally connected to the outer periphery of the rotary shaft at a position off the pivot shaft, the rotary shaft rotating Then, the connecting rod pivots the pivot member so that the connecting rod moves in either the front direction or the rear direction and pushes up the seating cushion,
Consisting of
The actuating means is
A seat belt anchor that is fixed to the rotating shaft and attaches one end of the seat belt to a position off the rotating shaft of the rotating shaft, and the rotating shaft is temporarily rotated until a tensile force exceeding a predetermined level is applied to the seat belt. Temporary fixing means to stop,
Consisting of,
However, the seat of claim 2. The temporary fixing means is
A pin fixed to the seat frame at a position deviating from the rotation axis of the rotation shaft, and a hole formed in the seat belt anchor so as to surround an outer periphery of the pin;
Consisting of
When a tensile force of a predetermined level or more is applied to the seat belt, the seat belt anchor rotates and the hole is broken by the pin, whereby the temporary fixing means is released, and the seat belt anchor And the rotating shaft rotates,
However, the seat of claim 6. The temporary fixing means is
A pin fixed to the seat frame at a position off the rotation axis of the rotation shaft, and a hook-shaped hole formed in the seat belt anchor so as to surround the outer periphery of the pin;
Consisting of
When a tensile force of a predetermined level or more is applied to the seat belt, the seat belt anchor rotates, and the hook-shaped hole is deformed by the pin, thereby releasing the temporary fixing means, The rotating shaft rotates together with the seat belt anchor.
However, the seat of claim 6. A vehicle seat with a seat belt,
A seat having a seat frame fitted with a cushion for sitting;
A backrest with a back frame attached with a backrest cushion attached to the rear of the seat frame, and a headrest attached to the top of the backrest;
Consisting of
The sitting cushion is
A peripheral portion having an opening extending from a central portion to a rear portion of the seating cushion; and a seating portion that fits into the opening;
Consisting of
The seat frame is
A lift-up means for pushing up the seat portion with respect to the rear portion of the seat cushion when a tensile force of a predetermined level or more is applied to the seat belt;
But the seat. The lift-up means
A pivot member located below the seating portion and having a rear portion pivotably connected to the seat frame;
A pivot mechanism for pivoting the pivot member so as to push up the seat portion with respect to a rear portion of the seat cushion, and the pivot when the seat belt is subjected to a tensile force of a predetermined level or more. Actuating means for actuating said pivot mechanism to pivot the member;
Consisting of,
However, the seat of claim 9. The pivot mechanism is
A rotating shaft that is attached to the seat frame so as to be rotatable in the left-right direction, the rotating shaft of the rotating shaft being located behind the pivot shaft of the pivot member, and the pivot member A connecting rod having one end pivotably connected to the pivot member and the other end pivotally connected to the outer periphery of the rotary shaft at a position off the pivot shaft, the rotary shaft rotating Then, the connecting rod pivots the pivot member so that the connecting rod moves in either the front direction or the rear direction and pushes up the seating portion,
Consisting of
The actuating means is
A seat belt anchor that is fixed to the rotating shaft and attaches one end of the seat belt to a position off the rotating shaft of the rotating shaft, and the rotating shaft is temporarily rotated until a tensile force exceeding a predetermined level is applied to the seat belt. Temporary fixing means to stop,
Consisting of,
However, the seat of claim 10. The temporary fixing means is
A pin fixed to the seat frame at a position deviating from the rotation axis of the rotation shaft, and a hole formed in the seat belt anchor so as to surround an outer periphery of the pin;
Consisting of
When a tensile force of a predetermined level or more is applied to the seat belt, the seat belt anchor rotates and the hole is broken by the pin, whereby the temporary fixing means is released, and the seat belt anchor And the rotating shaft rotates,
However, the seat of claim 11. The temporary fixing means is
A pin fixed to the seat frame at a position off the rotation axis of the rotation shaft, and a hook-shaped hole formed in the seat belt anchor so as to surround the outer periphery of the pin;
Consisting of
When a tensile force of a predetermined level or more is applied to the seat belt, the seat belt anchor rotates, and the hook-shaped hole is deformed by the pin, thereby releasing the temporary fixing means, The rotating shaft rotates together with the seat belt anchor.
However, the seat of claim 11.

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