JP2008265580A - Seat device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat device capable of displacing a foldable seat cushion from a storing position to a sitting position without using a releasing lever. <P>SOLUTION: The seat device 10 comprises a base member 12, a seat back 13, and the seat cushion 14. The seat cushion 14 is rotatable over the sitting position and the storing position. A lock arm 52 provided for the base member 12 can rotate around a rotation shaft 60 to first/second directions. A rear part of the seat cushion 14 is provided with an engaging member 51. The lock arm 52 is formed with an engaging/receiving part 70 for fitting the engaging member 51 when the seat cushion 14 moves to the storing position. An arm driving spring 53 impels the lock arm 52 to the first direction A when the seat cushion 14 is at the storing position and to the second direction (lock releasing direction) when the seat cushion 14 returns from the storing position to the sitting position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat device having a foldable seat cushion mounted on a vehicle or the like.

  In a seat device mounted on a vehicle, a device that can fold (store) the seat cushion when the seat cushion is not used has been proposed. This type of seat device is configured such that, for example, as shown in Patent Document 1 or Patent Document 2 below, the seat cushion can rotate between a seating position and a retracted position around an axis.

A vehicle seat having a foldable seat cushion includes a holding mechanism for holding the seat cushion in a retracted position. A conventional holding mechanism includes a release lever that is used when the seat cushion is returned to the seating position, for example, as disclosed in Patent Document 1. The release lever is disposed in the vicinity of the seat cushion, and when the release lever is moved in the unlocking direction, the seat cushion can be returned from the storage position to the seating position.
JP 10-35333 A JP 2005-75193 A

  In a conventional vehicle seat device having a release lever, when the seat cushion is returned from the retracted position to the seated position, the release lever is operated in the unlocking direction with one hand. At this time, if the seat cushion is not pressed with the other hand, the seat cushion may move to the seating position vigorously by its own weight. For this reason, it is necessary to operate the operating lever with one hand and support the seat cushion with the other hand. In the conventional seat device, since the release lever protrudes in the vicinity of the seat cushion, the presence of the release lever causes a space near the seat cushion to be narrowed. Moreover, a part of the passenger's body may touch the release lever.

  Accordingly, an object of the present invention is to provide a seat device that can hold the seat cushion in the retracted position and return the seat cushion from the retracted position to the seated position without using a release lever.

  A vehicle seat according to the present invention is attached to a base member, a seat back attached to the base member, and to the base member so as to be pivotable up and down about an axis, and moves between a seating position and a retracted position. And a holding mechanism for holding the seat cushion in the retracted position. The holding mechanism is provided at a rear portion of the seat cushion, and is engaged with an engagement member that moves along an arc centered on the shaft integrally with the rear portion of the seat cushion, and a rotation shaft provided on the base member. And is supported rotatably in the second direction, fitted into the engagement member in the state moved in the first direction, and from the engagement member in the state moved in the second direction. A lock arm having an engagement receiving portion that is pulled out, and is provided between the lock arm and the base member, and moves the lock arm in the first direction while the seat cushion moves from the seating position to the retracted position. And an arm drive spring that biases the lock arm in the second direction in a state where the seat cushion is pushed backward from the retracted position and moved.

  The arm drive spring is locked to, for example, a first end portion that is locked to a first spring mounting portion provided on the base member, and a second spring mounting portion that is formed on the lock arm. A torsion coil spring having a second end portion and a winding portion formed between the first and second end portions, and the arm drive spring is centered on the first spring mounting portion. The lock arm is movable in the first direction in a state where the second spring mounting portion is positioned below a neutral shaft connecting the center of the rotating shaft and the first spring mounting portion. The lock arm is urged in the second direction in a state where the second spring mounting portion is positioned above the neutral shaft.

It is good to have further a press spring which presses the engagement member in the direction which fits the engagement receiving part when the seat cushion is in the storing position.
The lock arm includes a first guide surface that guides the seat cushion to move to the engagement receiving portion while being in contact with the seat cushion while moving from the seating position to the retracted position; and the seat A second guide surface that rotates the lock arm in a direction in which the engagement member comes out of the engagement receiving portion when the engagement member comes into contact with the cushion when the cushion is pushed rearward from the retracted position; The seat cushion may have a third guide surface that rotates the lock arm in the first direction when the engagement member comes into contact with the seat cushion while moving from the retracted position to the seating position.

  According to the present invention, when the seat cushion in the retracted position is pushed rearward, the lock arm becomes unlocked and the seat cushion can be returned to the seating position. In other words, since the seat cushion itself functions as an operation unit for unlocking, the seat cushion can be returned from the storage position to the seating position without using a conventional release lever, and the operation of returning the seat cushion to the seating position is facilitated. Can be done. According to the present invention, since the release lever is not required, the space near the seat cushion can be used more widely, and the occupant does not hit the release lever.

A vehicle seat device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 7.
FIG. 1 shows an example of a vehicle seat device 10. The seat device 10 includes a base member 12 fixed to a vehicle floor member 11 (only a part of which is shown), a seat back 13 provided at a rear portion of the base member 12, and a retractable (foldable) seat. A cushion 14 and a holding mechanism 15 (shown in FIGS. 3 to 7) for holding the seat cushion 14 in the retracted position are provided. FIG. 2 shows a state in which the seat cushion 14 is moved to the storage position.

  FIG. 3 is a front view of the lower part of the seat device 10 as viewed from the front side with the seat cushion 14 moved to the retracted position. The base member 12 includes a frame member 20 made of, for example, a metal pipe, and a pair of left and right upright walls 21 and 22 that rise upward from the rear portion of the frame member 20. The bracket 23 provided at the lower part of the frame member 20 is fixed to the floor-side member 11 (shown in FIG. 1) by a bolt (not shown).

  The seat back 13 includes a frame member (seat back frame) (not shown), a pad member 30 including a skin, and the like. The lower end of one side portion of the seat back 13 is supported by the one standing wall 21 of the base member 12 via the reclining mechanism 31 so as to be rotatable in the front-rear direction. The lower end of the other side portion of the seat back 13 is rotatably supported by a shaft 32 (shown in FIG. 3). For this reason, the seat back 13 can move in the front-rear direction, and the tilt angle of the seat back 13 can be adjusted by operating the reclining mechanism 31.

  The seat cushion 14 includes a metal frame member (cushion frame) 40 shown in FIG. 4 and the like, a pad member 41 including a skin, and the like. The rear portion of the seat cushion 14 is supported by shafts 42 and 43 (shown in FIG. 3 and the like) extending in the horizontal direction provided on the standing walls 21 and 22 so as to be rotatable in the vertical direction. The seat cushion 14 can move in the vertical direction about the shafts 42 and 43 over the seating position shown in FIG. 4 and the storage position (folding position) shown in FIG.

  As shown in FIG. 4, cushioning stopper rubbers 47, 48 that abut against the support portions 45, 46 of the base member 12 when the seat cushion 14 is in the seating position are attached to the lower surface of the seat cushion 14. An extending portion 50 is provided at the rear end of the seat cushion 14. The extending portion 50 is formed at the rearmost portion of the frame member 40 and protrudes toward the rear of the seat cushion 14 as shown in FIG.

  The holding mechanism 15 for holding the seat cushion 14 in the retracted position includes an engagement member 51 provided in the extending portion 50 of the seat cushion 14 and a lock arm 52 provided on one standing wall 21 of the base member 12. An arm drive spring 53, a push spring 54, a stopper pin 55, and the like. The engaging member 51, the lock arm 52, the arm drive spring 53, the push spring 54, and the stopper pin 55 are disposed inside the standing wall 21.

  The engaging member 51 has a pin shape, is attached to the rear portion of the seat cushion 14, that is, the side surface of the extending portion 50, and protrudes in the horizontal direction toward the inner surface of the standing wall 21. The engagement member 51 has an arc R having a radius L (shown in FIG. 4) from the shaft 42 to the engagement member 51 when the seat cushion 14 rotates in the vertical direction about the shafts 42 and 43. Move along.

  The lock arm 52 is supported by a horizontal rotation shaft 60 provided on the base member 12 so as to be rotatable in the vertical direction. The lock arm 52 is centered on the rotation shaft 60, and a first direction (locking direction) indicated by an arrow A in FIGS. 4 and 5 and a second direction (locking direction) indicated by an arrow B in FIGS. Can be rotated in the release direction). More specifically, the lock arm 52 extends over the first position shown in FIG. 4, the second position shown in FIG. 5, the third position shown in FIG. 6, and the fourth position shown in FIG. It can be rotated.

  On the upper surface of the lock arm 52, an engagement receiving portion 70 formed of a concave portion opened upward, a flat first guide surface 71, and a second guide surface inclined forward upward with respect to the first guide surface 71 72 and a third guide surface 73 inclined rearwardly upward is formed. The engagement receiving portion 70 is a concave portion into which the engagement member 51 can be fitted, and when the seat cushion 14 is in the retracted position shown in FIG. Is formed.

  The first guide surface 71 is formed on the rear side of the engagement receiving portion 70 and on the front side of the rotation shaft 60 of the lock arm 52. The first guide surface 71 can come into contact with the engaging member 51 that moves along the arc R in a state where the lock arm 52 is turned up to the first position shown in FIG. Formed in position.

  The second guide surface 72 extends obliquely upward from the engagement receiving portion 70 toward the tip 52 a of the lock arm 52. When the seat cushion 14 is pushed and moved further backward (in the direction indicated by the arrow P1 in FIG. 5) from the storage position shown in FIG. 5, the second guide surface 72 moves the engagement member 51 to the second guide surface. Inclined shape so that the lock arm 52 can be guided to rotate downward in the direction in which the engagement member 51 comes out of the engagement receiving portion 70 as it moves in the direction indicated by the arrow P2 while being in contact with the surface 72. It is said.

  The third guide surface 73 is formed on the rear side of the rotation shaft 60 of the lock arm 52, and extends obliquely upward toward the rear of the lock arm 52. The third guide surface 73 comes into contact with the engaging member 51 moving from the front along the arc R in a state where the lock arm 52 is pivoted and lowered to the fourth position shown in FIG. Thus, the lock arm 52 is formed at a position where the lock arm 52 can be rotated in the first direction A.

  The arm drive spring 53 is a torsion coil spring having a first end portion 81, a second end portion 82, and a winding portion 83 formed in a coil shape between the both end portions 81 and 82. The first end portion 81 is locked to a first spring attachment portion 85 formed on the standing wall 21 of the base member 12. The second end portion 82 is engaged with a second spring attachment portion 86 formed on the lock arm 52.

  The arm drive spring 53 has a spring mounting portion 85 in a state where a torsional torque is applied to the winding portion 83 so that a repulsive load is generated in a direction in which the first end portion 81 and the second end portion 82 are separated from each other. , 86. When the lock arm 52 rotates about the rotation shaft 60, the second spring mounting portion 86 moves with the lock arm 52, so that the entire arm drive spring 53 moves (rotates) about the first spring mounting portion 85. ).

  In this specification, a line segment X connecting the center C of the rotation shaft 60 and the first spring mounting portion 85 is referred to as a neutral shaft. When the seat cushion 14 is in the seating position (FIG. 4) and the retracted position (FIG. 5), the second spring mounting portion 86 is positioned below the neutral shaft X. At this time, the repulsive load of the arm drive spring 53 biases the lock arm 52 in the first direction (the direction indicated by the arrow A in FIGS. 4 and 5). For this reason, the lock arm 52 is held in a posture in which the tip 52a is raised. At this time, the lock arm 52 contacts the stopper pin 55, and the posture of the lock arm 52 is maintained by the repulsive load of the arm drive spring 53.

  When the seat cushion 14 is pushed further rearward from the retracted position, the second spring mounting portion 86 moves to the upper side of the neutral axis X as the lock arm 52 rotates to the position shown in FIG. At this time, the repulsive load of the arm drive spring 53 biases the lock arm 52 in the second direction (the direction indicated by the arrow B in FIGS. 6 and 7). For this reason, the lock arm 52 is held in a posture in which the tip 52a is lowered. At this time, the lock arm 52 is in a state where the surface 74 opposite to the first guide surface 71 is in contact with the support portion 45, and the posture is maintained by the repulsive load of the arm drive spring 53.

  Thus, the lock arm 52 is biased in the first direction A (lock direction) by the arm drive spring 53 when the second spring mounting portion 86 is below the neutral axis X, and the second spring mounting portion When the portion 86 is on the upper side of the neutral axis X, it is biased in the second direction B (unlock direction) by the arm drive spring 53. That is, the arm drive spring 53 functions as a toggle spring in which the direction of the reaction force applied to the lock arm 52 is reversed with the neutral axis X as a boundary.

  The push spring 54 is a torsion coil spring having a fixed arm portion 90, a moving arm portion 91, and a winding portion 92 formed in a coil shape between the arm portions 90 and 91. The winding portion 92 is fixed to the standing wall 21 of the base member 12 by a fixing part 93. The fixed-side arm portion 90 is in contact with the inner surface of the flange portion 94 of the standing wall 21 that functions as a spring receiving portion.

  When the seat cushion 14 is in the seating position (FIG. 4), the arm 91 on the moving side of the push spring 54 is in a free state. When the seat cushion 14 is moved to the retracted position (FIG. 5) and the engaging member 51 is fitted into the engaging receiving portion 70, the engaging member 51 comes into contact with the arm portion 91 on the moving side, and the winding portion 83 is screwed. As a result, a repulsive load is generated, and the engagement member 51 is pressed against the engagement receiving portion 70.

Below, the effect | action of the sheet | seat apparatus 10 of this embodiment is demonstrated.
As shown in FIG. 4, when the seat cushion 14 is in the seating position, the stopper rubbers 47 and 48 of the seat cushion 14 come into contact with the support portions 45 and 46 of the base member 12 from above so that the seat cushion 14 is suitable for seating. It is kept in an almost horizontal position.

  When the seat cushion 14 is raised from the seating position (FIG. 4) to the retracted position (FIG. 5), the engaging member 51 is in contact with the first guide surface 71 of the lock arm 52 during the movement. The engagement member 51 is finally engaged with the engagement receiving portion 70.

  At this time, since the second spring mounting portion 86 of the lock arm 52 is positioned below the neutral axis X, the repulsive load of the arm drive spring 53 acts on the lock arm 52 in the first direction A. Therefore, the lock arm 52 is held at a position where the tip 52a is raised, and is held in a state where the engagement member 51 is fitted to the engagement receiving portion 70 (lock position). Therefore, even when the hand is released from the seat cushion 14, the seat cushion 14 can be held in the retracted position.

  When the seat cushion 14 is in the retracted position, the engaging member 51 comes into contact with the arm 91 on the moving side of the push spring 54 and the winding portion 83 is twisted. As a result, the engagement member 51 is pressed in the direction in which the engagement member 51 is fitted into the engagement receiving portion 70. For this reason, it is possible to prevent the seat cushion 14 from “shaking” at the storage position. Further, the seat cushion 14 can be held in the retracted position against vibrations of starting and stopping of the vehicle.

  In order to return the seat cushion 14 from the retracted position to the sitting position, the seat cushion 14 is pushed by hand in the direction indicated by the arrow P1 in FIG. Then, the seat cushion 14 moves to the overstroke position shown in FIG. 6, and the engagement member 51 comes out of the engagement receiving portion 70 and rides on the second guide surface 72, so that the lock arm as shown in FIG. 52 rotates in the second direction B, that is, in the unlocking direction.

  Further, the second spring mounting portion 86 of the lock arm 52 moves to the upper side of the neutral axis X, whereby the repulsive load of the arm drive spring 53 biases the lock arm 52 in the second direction B. Therefore, the lock arm 52 moves to the third position (lock release position) shown in FIG. 7 and is held at this position. Under this state, the engagement member 51 does not engage with the engagement receiving portion 70, so that the seat cushion 14 is rotatable about the shafts 42 and 43. Therefore, if the seat cushion 14 is rotated and lowered while the hand is attached to the seat cushion 14, the seat cushion 14 can be returned from the retracted position to the seating position (FIG. 4).

  While the seat cushion 14 returns to the seating position, the engagement member 51 abuts against the third guide surface 73 of the lock arm 52, so that the lock arm 52 rotates in the first direction A. The mounting portion 86 moves again below the neutral axis X. For this reason, the lock arm 52 is again held at the first position shown in FIG. 4 by the repulsive load of the arm drive spring 53.

  As described above, according to the seat device 10 of the present embodiment, the engagement member 51 is engaged with the engagement receiving portion 70 of the lock arm 52 by moving the seat cushion 14 from the seating position to the storage position. The seat cushion 14 can be held in the retracted position. When returning the seat cushion 14 from the retracted position to the seating position, the engagement member 51 can be removed from the engagement receiving portion 70 by pushing the seat cushion 14 backward by hand, and the lock arm 52 is locked. Since it is held in the release position, the seat cushion 14 can be moved to the seating position with a hand attached.

  That is, in the seat device 10 of the present embodiment, the seat cushion 14 can function as a lock release lever, and the conventional release lever can be eliminated. For this reason, in the state where the seat cushion 14 is folded (stored), the space below the seat cushion 14 can be used more widely, and the release lever that the passenger's body can touch can be eliminated.

  Moreover, when the seat cushion 14 is moved from the retracted position to the seated position, the locked state can be released by simply pushing the seat cushion 14 backward from the retracted position. Therefore, the operation of returning to the seated position can be easily performed with one operation. Can do. Moreover, there is no problem that the seat cushion 14 suddenly falls to the seating position due to its own weight, and the operability is good.

  Needless to say, in carrying out the present invention, the constituent elements of the invention including the base member, the seat cushion, and the holding mechanism can be appropriately modified. The seat device of the present invention can also be applied to a vehicle seat other than a vehicle or a seat installed in a building.

1 is a perspective view of a seat device according to an embodiment of the present invention. The perspective view of the state which accommodated the seat cushion of the seat apparatus shown by FIG. The front view which looked at the lower part of the seat apparatus from the front in the state which stored the seat cushion of the seat apparatus shown by FIG. The side view of the holding mechanism of the sheet apparatus shown in FIG. FIG. 5 is a side view of a state in which the seat cushion is moved to a storage position in the holding mechanism illustrated in FIG. 4. The side view of the state in which the seat cushion was pushed back from the storing position in the holding mechanism shown in FIG. FIG. 5 is a side view of the holding mechanism shown in FIG. 4 in a state where the lock arm has moved to a lock release position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Seat apparatus 12 ... Base member 13 ... Seat back 14 ... Seat cushion 15 ... Holding mechanism 42, 43 ... Shaft 51 ... Engagement member 52 ... Lock arm 53 ... Arm drive spring 54 ... Push spring 60 ... Rotating shaft 70 ... Engagement receiving part 71 ... 1st guide surface 72 ... 2nd guide surface 73 ... 3rd guide surface

Claims (4)

A base member;
A seat back attached to the base member;
A seat cushion that is attached to the base member so as to be pivotable in the vertical direction about an axis, and is movable between a seating position and a storage position;
A holding mechanism for holding the seat cushion in the storage position;
The holding mechanism is
An engagement member provided at a rear portion of the seat cushion and moving along an arc centered on the axis integrally with the rear portion of the seat cushion;
A pivot shaft provided on the base member is rotatably supported in a first direction and a second direction, and is fitted to the engagement member in a state of moving in the first direction. A lock arm having an engagement receiving portion that comes out of the engagement member in a state moved in the direction of 2;
The lock arm is provided between the lock arm and the base member, and urges the lock arm in the first direction while the seat cushion moves from the seating position to the retracted position, and the seat cushion is retracted. An arm drive spring that urges the lock arm in the second direction in a state of being moved rearward from a position;
A sheet apparatus comprising:   The arm drive spring includes a first end that is locked to a first spring mounting portion provided on the base member, and a second end that is locked to a second spring mounting portion formed on the lock arm. A torsion coil spring having two end portions and a winding portion formed between the first and second end portions, the arm drive spring being movable about the first spring mounting portion The lock arm is attached to the first direction in a state where the second spring mounting portion is positioned below a neutral shaft connecting the center of the rotating shaft and the first spring mounting portion. 2. The seat device according to claim 1, wherein the lock arm biases the lock arm in the second direction in a state where the second spring mounting portion is positioned above the neutral shaft.   The seat device according to claim 1, further comprising a push spring that presses the engagement member in a direction in which the engagement member is fitted to the engagement receiving portion when the seat cushion is in the retracted position.   The lock arm includes a first guide surface that guides the seat cushion to move to the engagement receiving portion while being in contact with the seat cushion while the seat cushion moves from the seating position to the retracted position, and the seat cushion. A second guide surface that rotates the lock arm in a direction in which the engagement member comes out of the engagement receiving portion when the engagement member comes into contact with the engagement member when moved backward from the retracted position; The seat cushion has a third guide surface that rotates the lock arm in the first direction when the engagement member comes into contact with the seat cushion during the movement from the retracted position to the seated position. The sheet apparatus according to any one of claims 1 to 3.

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