JP5113458B2 - Frame structure for vehicle seat - Google Patents

Description

  The present invention relates to a frame structure for a vehicle seat including a seat frame serving as a skeleton of a seat cushion and a back frame serving as a skeleton of a seat back.

  Various safety technologies have been proposed for vehicle seats used in vehicles such as automobiles. Among them, the back plate of the seat back retracts against the rear impact when the vehicle receives a collision from the rear. There is a back plate retraction technique in which the back of the seated person is moved backward, the back of the head of the seated person is brought closer to the headrest, the impact of the impact on the head of the seated person is reduced, and whiplash is reduced.

  FIG. 4 exemplifies such a back plate retraction technique, and FIGS. 4A, 4B, and 4C show examples of a vehicle seat that is a background art of the present invention when a rear impact is received. The front view which shows the state which a backplate tilts, (d) is principal part detail drawing of the backplate front position locking means with which the said vehicle seat is equipped. The vehicle seat 50 is described in Patent Document 1.

  The vehicle seat 50 shown in FIG. 4 is locked and supported so that a seat cushion (not shown), a seat back 42, a headrest 43, and a back plate 32a built in the seat back 42 are normally held in the front position. When the rear impact is received, the back plate front position locking means 38 for releasing the lock support and tilting the back plate 32a to the rear position is provided.

  The back plate front position locking means 38 is provided with a lock receiving portion 33 on the rear side of the lower end of the back plate 32a supported by the seat back 42 so as to be rotatable at a fulcrum 32b above the seat back 42, and the lock receiving portion 33 at all times. And an anti-swing member 34 having an inward projecting portion 34c.

  The swing preventing member 34 can be rotated around a predetermined axis, and is always urged in the direction indicated by the arrow A in FIGS. 4A and 4D by an urging means (not shown). While being provided with the portion 34w, the weight portion 34w shown in FIG. 4 (a) is always kept in the downward position while receiving the urging force, and the inwardly projecting portion 34c holds the back plate 32a on the lock receiving portion 33. The normal inclination state with respect to the seat back 42 of the back plate 32a is maintained.

  With this configuration, when the vehicle seat 50 is subjected to a rear impact, the weight 34w of the rocking prevention member 34 is caused by the inertial force, as shown in FIG. By rotating in the opposite direction, the lock of the inward projecting portion 34c to the lock receiving portion 33 is released, and the back plate retreat function can be exhibited as shown by the arrow B in FIG.

  However, although the back plate retreating function by the back plate front position locking means 38 in the vehicle seat 50 is taught in that it uses the inertial force due to the rear impact, the inertia due to the rear impact is similarly applied. It seemed to be able to demonstrate the backboard retraction function with different configurations while using force.

  Similarly, the automobile seat disclosed in Patent Document 2 is a back plate retraction technology that uses the inertial force caused by the rear impact, but the back plate retreat technology that uses the inertia force caused by the rear impact is different from this Patent Literature 2. Seemed possible.

  The seat backs for automobiles of Patent Documents 3 and 4 demonstrate the back plate retreat function by supporting the back plate with the urging means that does not extend with the seat load but only with the impact load accompanying the rear-end collision. However, it seemed that the back plate retracting function could be demonstrated by a method different from this method.

The above problem is not a problem of the vehicle seat but a problem of the frame structure of the vehicle seat that forms the skeleton of the vehicle seat.
Japanese Patent Laying-Open No. 2007-112204 (FIGS. 6, 8 and 20) Japanese Patent No. 3775059 (FIGS. 1 and 2, reference numerals 18 and 19) Japanese Patent Laying-Open No. 2000-201769 (FIG. 1. Reference numeral 18) JP 2000-21157A (FIG. 1. Reference numeral 18)

  An object of the present invention is to provide a framework structure for a vehicle seat equipped with a back plate retraction technique having a novel configuration that utilizes inertial force due to a rear impact.

The framework structure for a vehicle seat according to claim 1 is a framework structure for a vehicle seat including a seat frame serving as a skeleton of a seat cushion and a back frame serving as a skeleton of a seat back,
The back frame includes an outer frame that forms the entire outer shape, and a back plate that is supported so as to be movable in the front-rear direction with respect to the outer frame.
The back plate is supported by the outer frame body by a back plate front position locking means,
The back plate front position locking means locks and supports the outer frame body so as to hold the back plate at the front position in response to a load on the back of the seated person at normal times and when receiving a rear impact. Is to release the lock support and move the back plate to its subsequent position,
The interlocking rotating plate that rotates in conjunction with the back-and-forth movement of the back plate, and the interlocking rotating plate are in contact with each other in a concavo-convex portion, and the interlocked rotating plate is locked by the mutual contact. A lock rotation plate that rotates in the release direction for releasing the lock but does not rotate in the lock direction opposite to the release direction, and a biasing means that biases the lock rotation plate in the lock direction. Prepared,
The concavo-convex portion is constituted by a lock convex portion that is on the lock rotational plate side and enters the interlocking rotational plate direction, and a lock concave portion that is on the interlock rotational plate side and has a shape corresponding to the lock convex portion,
The contact point that has entered the interlocking rotation plate on the lock convex portion most than the interaxial distance between the interlocking rotation plate and the lock rotation plate and the axis center of the interlocking rotation plate and the The contact point position distance obtained by adding the distance between the contact point and the distance between the axial center of the lock rotation plate and the contact point is large,
The lock convex part is on the release side from the contact point, the lock arc part is an arc shape of the center of the axis of the lock rotary plate, and the lock side from the contact point of the lock convex part is the interlocking rotary plate when released. It is a release relief part of a shape that does not hinder the rotation of
The lock rotation plate rotates in the release direction by overcoming the urging force of the urging means by an inertial force caused by a rear impact.

According to the framework structure for a vehicle seat according to claim 1, a framework structure for a vehicle seat including a seat frame serving as a skeleton of a seat cushion and a back frame serving as a skeleton of a seat back, The back frame includes an outer frame that forms the entire outer shape, and a back plate that is supported so as to be movable in the front-rear direction with respect to the outer frame.
The back plate is supported by the outer frame body by a back plate front position locking means,
The back plate front position locking means locks and supports the outer frame body so as to hold the back plate at the front position in response to a load on the back of the seated person at normal times and when receiving a rear impact. Is to release the lock support and move the back plate to its subsequent position,
The interlocking rotating plate that rotates in conjunction with the back-and-forth movement of the back plate, and the interlocking rotating plate are in contact with each other in a concavo-convex portion, and the interlocked rotating plate is locked by the mutual contact. A lock rotation plate that rotates in the release direction for releasing the lock but does not rotate in the lock direction opposite to the release direction, and a biasing means that biases the lock rotation plate in the lock direction. Prepared,
The concavo-convex portion is constituted by a lock convex portion that is on the lock rotational plate side and enters the interlocking rotational plate direction, and a lock concave portion that is on the interlock rotational plate side and has a shape corresponding to the lock convex portion,
The contact point that has entered the interlocking rotation plate on the lock convex portion most than the interaxial distance between the interlocking rotation plate and the lock rotation plate and the axis center of the interlocking rotation plate and the The contact point position distance obtained by adding the distance between the contact point and the distance between the axial center of the lock rotation plate and the contact point is large,
The lock convex part is on the release side from the contact point, the lock arc part is an arc shape of the center of the axis of the lock rotary plate, and the lock side from the contact point of the lock convex part is the interlocking rotary plate when released. It is a release relief part of a shape that does not hinder the rotation of
The lock rotating plate overcomes the urging force of the urging means by the inertial force due to the rear impact, and rotates in the release direction. Therefore, the back plate having a novel configuration utilizing the inertial force due to the rear impact. A framework structure of a vehicle seat provided with a retraction technique can be provided.

  Hereinafter, embodiments (examples) of the present invention will be described with reference to the drawings.

  FIG. 1A is a front view showing an example of a framework structure of a vehicle seat according to the present invention, FIG. 1B is a view showing a back frame of FIG. 1A viewed from the front, and FIG. It is a side perspective view of a frame.

  The frame structure 10 for a vehicle seat includes a seat frame 1 serving as a skeleton of a seat cushion, a back frame 2 serving as a skeleton of a seat back, and a slide rail 9 that slides the seat frame 1 back and forth. Is.

  As shown in FIG. 2A, the frame structure 10 has a seat cushion 11 set on the seat frame 1 and a seat back 12 and a headrest 13 set on the back frame 2 to form a vehicle seat 20. It is installed on the vehicle body HB and seats a seated person P.

  Here, the direction of “front and rear, left and right, up and down” is defined based on the sitting posture of the seated person P.

  The slide rail 9 is a pair of left and right, and includes an upper rail 9a and a lower rail 9b that slide back and forth without rattling. The upper rail 9a is on the upper side, and the seat frame 1 is supported thereon.

  The lower rail 9b is fixed to the vehicle body HB at the front and rear. Thus, the frame structure 10 of the vehicle seat is slidable back and forth with respect to the vehicle body HB.

  In addition to this basic structure, the frame structure 10 includes a seat frame 2 having an outer frame 2a that forms the entire outer shape, and a back and top / left / right connecting rod 2c with respect to the outer frame 2a. The back plate 2b is supported by the front plate position lock means 8 so as to be movable in the front-rear direction. The back plate front position lock means 8 is normally connected to the outer frame body 2a by the back portion of the seated person P. Upon receiving a load F (see FIG. 2), the back plate 2b is locked and supported so as to hold it in its front position. When a rear impact is received, the lock support is released and the back plate 2b is moved to its rear position. It is made to move and exhibits a backboard retraction function. This will be described in detail below.

  2A is a conceptual diagram showing a state in which a seated person is seated on a vehicle seat having the framework structure of the vehicle seat of FIG. 1 as a skeleton, and FIG. 2B is a back plate front position lock of FIG. It is a principal part detail drawing which shows a means. Accordingly, the same parts as those already described are denoted by the same reference numerals and redundant description is omitted.

  Although the vehicle seat 20 in FIG. 2A has already been described, in a normal seating state, there is a certain space between the back of the head PH of the seated person P and the headrest 13, and the rear The problem with the backboard retraction technique is how to smoothly reduce this space to zero when there is a shock.

  As this back plate retraction technique, the frame structure 10 for a vehicle seat according to the present invention includes a back plate front position locking means 8 as shown in FIG. In this example, the outer frame 2a locks the back plate 2b with four back plate front position locking means 8 in the upper, lower, left and right positions. It is good also as a place.

  Further, the back plate front position locking means 8 shown in FIG. 2 (b) shows the one installed on the upper left side of the back frame 2 as viewed from the left side of the back frame 2. Therefore, what is installed on the upper right side of the back frame 2 is bilaterally symmetrical with that of FIG.

  Also, what is installed underneath is not necessarily the same as that shown in FIG. 2 (b) due to the retreat length below the back plate 2b, the handling space, etc. The specific invention configuration is the same.

  The back plate front position locking means 8 contacts the interlocking rotation plate 3 that rotates in conjunction with the back-and-forth movement of the back plate 2b, and the interlocking rotation plate 3 in an interdigitated state (3c, 4c). Then, by the mutual contact, the lock rotation plate 4 that rotates in the release direction DU that releases the locked state of the interlocking rotation plate 3 but does not rotate in the lock direction DL opposite to the release direction DU, And an urging means 5 for urging the lock rotation plate 4 in the lock direction DL.

  The concavo-convex portion is formed by a lock convex portion 4c that enters the interlocking rotation plate 3 direction on the lock rotation plate 4 side, and a lock concave portion 3c that has a shape corresponding to the lock projection portion 4c on the interlocking rotation plate 3 side. Compared to the inter-axis distance LA between the interlocking rotation plate 3 and the lock rotation plate 4, the interlocking rotation plate 3 is configured for the contact point 6 that is configured and enters the interlocking rotation plate 3 most on the lock convex portion 4 c. The contact point position distance LD obtained by adding the distance LB between the shaft center C3 and the contact point 6 and the distance LC between the shaft center C4 of the lock rotation plate 4 and the contact point 6 is large.

  2B, assuming a triangle connecting the axis center C3 of the interlocking rotation plate 3, the axis center C4 of the lock rotation plate 4 and the contact point 6, the contact point 6 is the vertex. The sum of the lengths of two adjacent sides (distance LB + distance LC = contact point position distance LD) is also a reasonable relationship from the basic principle of a triangle that is longer than the length of the opposite side (distance between axes LA).

  The axis center C3 of the interlocking rotation plate 3 and the axis center C4 of the lock rotation plate 4 are fixed to the outer frame body 2a of the back frame 2, and their positions do not move. The rotation of the rotating plate 4 is permitted.

  Therefore, the lock rotation plate 4 does not move in the lock direction DL from the state shown in FIG. 2B, thereby causing a normal back load F from the seated person P to the corresponding interlocking rotation plate 3. In this state, the interlocking rotating plate 3 firmly receives the back of the seated person P by the back plate 2b via the connecting rod 2c.

  In addition, in the back plate front position locking means 8, the lock arc 4a, which is the arc shape of the axial center C4 of the lock rotation plate 4, is provided on the release side from the contact point 6 of the lock projection 4c. On the lock side from the contact point 6 of 4c is a release relief portion 4b having a shape that does not hinder the rotation of the interlocking rotation plate 3.

  When the radius of curvature of the lock arc 4a is R, the radius of curvature R is equal to the distance LC between the axis center C4 of the lock rotating plate 4 and the contact point 6.

  Corresponding to the shape of the lock projection 4c of the lock rotation plate 4, the lock recess 3c of the interlocking rotation plate 3 includes a lock arc portion 3a and a release relief portion 3b.

  Further, in the back plate front position lock unit 8, the lock rotation plate 4 rotates in the release direction DU by overcoming the urging force of the urging unit 5 by the inertial force IF due to the rear impact. A portion below the axial center C4 of the lock rotation plate 4 and generating the inertial force IF is defined as a weight portion 4d.

  Further, the interlocking rotation plate 3 includes an offset arm portion 3d that is offset in the depth direction of the paper surface in FIG. 2B. The offset arm portion 3d is provided with a long hole-shaped connecting hole 3e, and one end of the connecting rod 2c is rotatably fitted in the offset arm portion 3d so that the interlocking rotating plate 3 rotates corresponding to the back-and-forth movement of the back plate 2b. Is realized.

  Since the offset arm portion 3d is offset from the engagement plane between the interlocking rotation plate 3 and the lock rotation plate 4, it interferes with the rotation of the interlocking rotation plate 3 and the lock rotation plate 4. is not.

  The function and effect of the lock uneven portion and the weight portion 4d having such a configuration will be described below with reference to FIG.

  FIG. 3A is a detail view of a main part showing a state in which the back plate front position locking means shown in FIG. 2B receives a rear impact and starts a releasing operation, and FIG. 3B is the back plate front position locking means. The principal part detail figure which shows the state which the lock | rock was cancelled | released and the backplate retracted, (c) is a conceptual diagram which shows the state of (b) similarly to Fig.2 (a).

  When receiving a rear impact, the lock rotation plate 4 starts to rotate in the release direction DU by the inertial force IF generated by the weight portion 4d. However, as shown in FIG. While the arc portion 4a and the lock arc portion 3a of the interlocking rotation plate 3 are in contact, the interlocking rotation plate 3 does not rotate.

  This is because the lock arc portion 4a of the lock rotation plate 4 is an arc centered on the axis center C4, and the distance to the lock arc portion 3a of the interlocking rotation plate 3 does not change.

  In such an initial stage of the rear impact, the interlocking rotation plate 3 does not rotate, that is, does not move in the forward direction of the back plate 2b. This means that the back plate 2b is firmly held and unnecessary advancement is performed. It is important as a backboard retraction technology in the sense that it will not let you.

  Next, as shown in FIG. 3B, when the contact (lock state) between the lock arc portion 4a of the lock rotation plate 4 and the lock arc portion 3a of the interlock rotation plate 3 is released, the interlock rotation is performed. The plate 3 rotates in a direction in which the back plate 2b is retracted rapidly and smoothly by the inertial force of the rear impact from the seated person P received by the back plate 2b.

  At this time, the release relief portion 4b of the lock convex portion 4c of the lock rotation plate 4 does not hinder the rotation of the interlocking rotation plate 3 in the direction in which the back plate 2b is retracted.

  Referring to FIG. 3 (c), the back plate 2b of the seat back 12 is moved backward by the action of the back plate front position lock means 8 to cause the back of the seat occupant P to recede to the seat occupant P. It can be seen that the back plate retraction technique for reducing the impact of impact on the head PH of the occupant P by bringing the back of the head relatively close to the headrest 13 is suitably embodied. .

  In addition, the combination of the interlocking rotation plate 3, the lock rotation plate 4, and the urging unit 5 of the back plate front position lock unit 8 uses any of the backgrounds except that the inertial force due to the rear impact is utilized. It is a novel structure not described in the technology, and has an inventive structure that is neither suggested nor taught by any background technology.

  Thus, according to the frame structure 10 for a vehicle seat provided with the back plate front position locking means 8, the frame structure of the vehicle seat provided with a novel configuration of the back plate retraction technique utilizing the inertial force due to the rear impact. The body can be provided.

  The framework structure of the vehicle seat of the present invention is not limited to the above-described embodiment, and various modifications and combinations are possible within the scope described in the claims and the scope of the embodiments. These modifications and combinations are also included in the scope of the right.

  The frame structure for a vehicle seat according to the present invention can be used in an industrial field in which a frame structure for a vehicle seat having a novel structure for retracting a back plate using inertia force due to a rear impact is required. .

(A) is a front view showing an example of a framework structure of a vehicle seat of the present invention, (b) is a view showing a back frame of (a) as viewed from the front, and (c) is a view of the back frame. Side perspective view (A) is a conceptual diagram showing a state in which a seated person is seated on a vehicle seat having the framework structure of the vehicle seat in FIG. 1 as a skeleton, and (b) shows a back plate front position locking means in (a). Detailed view of the main parts shown FIG. 2A is a detailed view of a main part showing a state in which the back plate front position locking means shown in FIG. 2B receives a rear impact and starts releasing operation, and FIG. The principal part detail figure which shows the state which was canceled and the backplate moved backward, (c) is a conceptual diagram which shows the state of (b) similarly to Fig.2 (a) (A), (b), (c) is a front view showing a state in which an example of a vehicle seat as a background art of the present invention receives a rear impact and the back plate tilts, (c) shows the vehicle Detailed view of the main part of the back plate front position locking means included in the seat

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat part frame 2 Back part frame 2a Outer frame body 2b Back board 2c Connecting rod 3 Interlocking rotation board 3a Lock arc part 3b Release relief part 3c Lock recessed part 4 Lock rotation board 4a Lock arc part 4b Release relief part 4c Lock convex part 4w Weight part 5 Biasing means 6 Contact point 8 Back plate front position locking means 10 Frame structure of vehicle seat 11 Seat cushion 12 Seat back 13 Headrest 20 Vehicle seat C3 Axis center of interlocking rotation plate C4 Lock rotation plate Axis center DL Lock direction DU Release direction F Seat load on the back of the IF IF Inertia force LA Inter-axis distance LB Distance between the axis center of the interlocking rotation plate and the contact point Distance between LD Contact point position distance P Seated person

Claims (1)

A frame structure of a vehicle seat including a seat frame serving as a skeleton of a seat cushion and a back frame serving as a skeleton of a seat back,
The back frame includes an outer frame that forms the entire outer shape, and a back plate that is supported so as to be movable in the front-rear direction with respect to the outer frame.
The back plate is supported by the outer frame body by a back plate front position locking means,
The back plate front position locking means locks and supports the outer frame body so as to hold the back plate at the front position in response to a load on the back of the seated person at normal times and when receiving a rear impact. Is to release the lock support and move the back plate to its subsequent position,
An interlocking rotating plate that rotates in conjunction with the back-and-forth movement of the back plate;
The interlocking rotating plate contacts with the interlocking rotating plate at the concavo-convex portion and rotates in the releasing direction to release the locked state of the interlocking rotating plate by the mutual contact, but in a direction opposite to the releasing direction. A lock rotation plate that does not rotate in the locking direction;
Urging means for urging the lock rotation plate in the locking direction;
The concavo-convex portion is constituted by a lock convex portion that is on the lock rotational plate side and enters the interlocking rotational plate direction, and a lock concave portion that is on the interlock rotational plate side and has a shape corresponding to the lock convex portion,
The contact point that has entered the interlocking rotation plate on the lock convex portion most than the interaxial distance between the interlocking rotation plate and the lock rotation plate and the axis center of the interlocking rotation plate and the The contact point position distance obtained by adding the distance between the contact point and the distance between the axial center of the lock rotation plate and the contact point is large,
The lock convex part is on the release side from the contact point, the lock arc part is an arc shape of the center of the axis of the lock rotary plate, and the lock side from the contact point of the lock convex part is the interlocking rotary plate when released. It is a release relief part of a shape that does not hinder the rotation of
The frame structure for a vehicle seat, wherein the lock rotation plate overcomes the urging force of the urging means by an inertial force due to a rear impact, and rotates in the release direction.

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