JP3723407B2 - Seat belt anchor locking structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat belt anchor locking structure in a seat in which a seat lower arm is configured to be vertically adjustable with respect to an upper rail of a seat track.
[0002]
[Prior art]
A seat 1 as shown in FIG. 5 is mounted on a seat track 2 that adjusts the position of the seat 1 back and forth. The seat track 2 is configured such that an upper rail 4 is slidably fitted to a lower rail 3 fixed to a floor so as to be slidable in the front-rear direction. A belt anchor plate 5 is fixed to the upper rail 4, and a seat belt fastening portion is attached to the belt anchor plate 5. P is provided. In the seat 1, when the position adjustment for moving the seat cushion 7 upward is performed, the distance between the seat cushion 7 and the belt anchor plate 5 (seat belt fastening portion P) is widened, and the seat belt bites into the occupant's body. This is not preferable.
[0003]
In order to eliminate the biting of the seat belt into the body, as shown in FIG. 6 (the same parts as those in FIG. 5 are denoted by the same reference numerals), a weld nut is attached to the lower arm 8 interlocked with the vertical position adjustment of the seat cushion 7. The thing provided with the seatbelt fastening part P which consists of etc. is also known. In this seat 1, the lift mechanism of the seat cushion 7 is constituted by a four-bar rotation chain mechanism in which links 9 and 10 are rotatably connected between the upper rail 4 and the lower arm 8.
[0004]
In the configuration in which the seat belt fastening portion P is provided in the lower arm 8, an impact load (usually a forward force of about 45 ° obliquely upward) is applied to the links 9 and 10, and therefore, it is necessary to increase the strength of this portion. However, the links 9 and 10 do not have sufficient strength against the force in the direction of the impact load, and the strength of the brake mechanism that restrains the links 9 and 10 at the inclination angle is low. It is difficult to increase the strength against the impact load.
[0005]
Therefore, in the configuration of FIG. 6, the support plate 11 having the arc-shaped elongated hole 11a is fixed to the upper rail 4, and the pin 12 is slidably fitted into the arc-shaped elongated hole 11a, and the pin 12 is linked. The upper end of the link 13 is rotatably connected to the upper end side pivot pin 14 of the link 10. With this configuration, the link 13 tilts when the seat 1 is adjusted up and down, and does not interfere with the raising and lowering of the seat cushion 7, and is in a state parallel to the impact load direction when an impact load is input. Support the load.
[0006]
[Problems to be solved by the invention]
In the configuration of FIG. 6, the link 13 can exhibit its function after the link 13 stands up and is parallel to the impact load direction as shown in FIG. 6. For this reason, the occupant moves forward together with the seat cushion 7 until an impact load is received from the seat belt and the link 13 rises in a state parallel to the impact load direction. In particular, when the seat cushion 7 is in the low position, the amount of movement of the occupant increases.
[0007]
The first object of the present invention is to provide a seatbelt anchor locking structure that eliminates the above disadvantages. In other words, a first object of the present invention is to realize a seat belt anchor locking structure capable of reducing the amount of movement of an occupant when an impact load is applied to a seat belt.
[0008]
A second object of the present invention is to realize a seat belt anchor locking structure which can be arranged in a space advantageous manner.
[0009]
[Means for Solving the Problems]
The invention according to claim 1, which solves the above-mentioned problem, is a locking structure for a seat belt anchor in a seat in which a lower arm of a seat is configured to be vertically adjustable with respect to an upper rail of a seat track, A belt anchor fastening portion connected to the seat belt side and a turning center portion rotatably attached to the lower arm are provided so that the belt anchor fastening portion is located behind the turning center portion, Further, at a position below the belt anchor fastening portion, a belt anchor link having a stopper projecting toward the upper rail, and a spring that urges the belt anchor link to urge the stopper forward. And a hole formed in the upper rail as a fitting hole with the stopper, and the rear inner wall surface has a front against the urging force of the spring. A locking step portion that engages with the stopper in a state in which the belt anchor link is rotated and restricts the upward movement of the stopper includes a fitting hole provided with a plurality of steps in the vertical direction. Is.
[0010]
In the first aspect of the present invention, when the impact load is applied to the seat belt and the belt anchor link rotates, the stopper moves upward while sliding on the rear inner wall surface of the fitting hole, and the first engagement is achieved. The movement of the occupant stops by engaging the stepped portion. Therefore, if the seat cushion is in the low position, the stopper is engaged with the locking step on the low position side, and the amount of movement of the occupant when an impact load is applied to the seat belt can be reduced.
[0011]
Further, in the present invention, it is not necessary to arrange the rotation center portion of the belt anchor link in the vicinity of the tilt center of the upper arm of the seat having no space. For this reason, an arrangement that is advantageous in terms of space can be taken.
[0012]
According to a second aspect of the present invention, in the seat belt anchor locking structure according to the first aspect, the belt anchor link is an L-shaped plate including a horizontal arm portion and a vertical arm portion, and a front end side of the horizontal arm portion. The pivot center portion is provided, the belt anchor fastening portion is provided at an intersection angle portion between the rear end side of the horizontal arm portion and the upper end side of the vertical arm portion, and the lower end side of the vertical arm portion is provided with the belt anchor fastening portion. A stopper is provided, and a stepped portion is formed at an intermediate position in the longitudinal direction of the vertical arm portion so that the lower end side of the vertical arm portion is close to the upper rail. The belt anchor fastening portion and the stopper are arranged to sandwich the lower arm using a through hole through which the step portion of the arm portion is inserted. Is shall.
[0013]
In the invention described in claim 2, if a strong impact load is applied, the locking stepped portion is deformed, the engagement between the stopper and the locking stepped portion on the lower position side is disengaged, and the stopper is placed on the upper side. Even if it encounters a situation where it engages with the locking step, the belt anchor fastening part and the stopper of the belt anchor link are arranged across the lower arm, so from a certain point of time the vertical arm part Since the step portion contacts the lower arm, the belt anchor fastening portion is prevented from rising at a plurality of locations. Therefore, safety is improved.
[0014]
According to a third aspect of the invention, in the seat belt anchor locking structure according to the first or second aspect, the upper rail is formed by forming a rail portion by forming a plate portion, and is made of the same plate material as the rail portion. The fitting hole is formed in the upright portion. In the present invention, the number of parts can be reduced.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a configuration diagram of the present embodiment viewed from the side of the sheet, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a sectional view taken along the line BB in FIG. 4 and 4 are exploded perspective views of the main part.
[0016]
In these drawings, the seat 21 is mounted on a seat track 31 that adjusts the position of the seat 21 back and forth. The seat 21 includes a lower arm 22 and an upper arm 23 provided on the lower arm 22 so as to be tiltable. A seat cushion 24 is attached to the lower arm 22, and a seat back (not shown) is attached to the upper arm 23.
[0017]
The seat track 31 is a lower rail 32 fixed to the floor and fitted with an upper rail 33 so as to be slidable in the front-rear direction. As the upper rail 33, a plate material is formed to form rail portions 34a and 35a in the lower part. A plate in which the plates 34 and 35 are welded back to back is used.
[0018]
The lower arm 22 of the seat 21 moves up and down with respect to the upper rail 33 when adjusting the position of the seat 21 (seat cushion 24) in the vertical direction. The lift mechanism of the seat cushion 24 in this embodiment is basically the same as the configuration of FIG. 6, and is configured by a four-bar rotation chain mechanism in which two links are rotatably connected between the upper rail 33 and the lower arm 22. ing. In FIG. 1 to FIG. 3, only the rear link is shown. That is, the link 41 corresponds to the link 10 in FIG. 6, and its front end portion is pivotally attached to the upright portion of the upper rail 33 with a stepped pin 42 and its rear end portion is a lower arm with a pin 43. It is pivotally attached to 22 so that rotation is possible.
[0019]
The extension arm 41a of the link 41 receives an operating force in the front-rear direction from a drive unit (not shown) when the seat cushion 24 is displaced up and down. For example, when the extension arm 41a receives a forward force, the link 41 41 rotates about the stepped pin 42 counterclockwise in FIG. 1, the pin 43 rises, and the lower arm 22 and the seat cushion 24 move upward.
[0020]
In the lift by the lift mechanism using the link 41, when the lower arm 22 is moved upward, the seat cushion 24 moves slightly forward. However, this movement is rather preferable because an occupant who needs to raise the hip point has short legs and frequently performs an operation of moving the seat cushion 24 forward.
[0021]
The belt anchor link 51 includes a belt anchor fastening part 51a connected to the seat belt side and a turning center part 51b rotatably attached to the lower arm 22, and the belt anchor fastening part 51a from the turning center part 51b. Also, a stopper 52 protrudes toward the upper rail 33 at a position below the belt anchor fastening portion 51a.
[0022]
More specifically, as shown in FIG. 4, the belt anchor link 51 is an L-shaped plate including a horizontal arm portion 53 and a vertical arm portion 54, and a rotation center portion 51 b is provided on the front end side of the horizontal arm portion 53. A belt anchor fastening portion 51a is provided at an intersection angle between the rear end side of the horizontal arm portion 53 and the upper end side of the vertical arm portion 54, and a stopper 52 is projected from the lower end side of the vertical arm portion 54. At an intermediate position in the longitudinal direction of the arm portion 54, a step portion 54 a is formed so that the lower end side of the vertical arm portion 54 approaches the upper rail 33. The lower arm 22 is formed with a through hole 22a through which the step portion 54a of the vertical arm portion 54 is inserted.
[0023]
A circular through hole is formed in the rotation center portion 51b on the belt anchor link 51, and the belt anchor link 51 can be rotated by loosely fitting the stepped pin 55 to the lower arm 22 to fix it. It is possible. A torsion spring 61 that pivots and biases the belt anchor link 51 in the direction in which the stopper 52 moves forward is fitted into the stepped pin 55 in a state of being hooked between the lower arm 22 and the belt anchor link 51. ing.
[0024]
A circular through hole is also formed in the belt anchor fastening portion 51a on the belt anchor link 51, and a belt anchor bolt 56 is inserted into the belt anchor fastening portion 51a, and the seat belt bracket 57 is overlapped with a washer and tightened with a nut 58. The seat belt is attached.
[0025]
A circular through hole is also drilled at the attachment position of the stopper 52 on the belt anchor link 51 (vertical arm portion 54), and a cylindrical intermediate portion 52b of the stopper 52 made of a columnar member with a collar is provided here. After the fitting, the collar portion 52 a is welded to the vertical arm portion 54. A male screw is cut at the small-diameter tip 52c of the stopper 52, and after inserting a washer 63 into the intermediate part 52b, a nut 62 is screwed therein.
[0026]
The upper rail 33 is formed with a fitting hole 33k with the stopper 52. In this embodiment, the lower arm 22 moves up and down with respect to the upper rail 33 while drawing an arc centered on the pin 42. For this reason, the shape of the fitting hole 33k is also an arc centered on the pin 42. Further, the rear inner wall surface of the fitting hole 33k is engaged with an intermediate portion 52b of the stopper 52 in a state where the belt anchor link 51 is rotated against the urging force of the torsion spring 61, and above the stopper 52. Locking step portions 33p, 33q, and 33r for restricting the movement to are arranged in the vertical direction. The length of the intermediate portion 52b of the stopper 52 is selected so that the stopper 52 can slide in the fitting hole 33k without causing axial play.
[0027]
Next, the operation of the above embodiment will be described. In this embodiment, when an impact load acts on the seat belt and the belt anchor link 51 rotates counterclockwise in FIG. 1, the stopper 52 moves upward while sliding on the rear inner wall surface of the fitting hole 33k, Engage with any of the first engaging steps 33p to 33r, and the movement of the occupant stops. As shown in FIG. 1, when the seat cushion 24 is in the low position, the stopper 52 engages with the locking step portion 33p at the low position, and the movement of the occupant stops at this point, and the seat belt The amount of movement of the occupant when the impact load is applied can be reduced.
[0028]
Further, in this embodiment, a strong impact load is applied, so that the locking step 33p is deformed, the engagement between the stopper 52 and the locking step 33p on the lower position side is released, and the stopper 52 Even when a situation occurs in which the upper locking step portions 33q and 33r are engaged, the belt anchor fastening portion 51a of the belt anchor link 51 and the stopper 52 are arranged with the lower arm 22 interposed therebetween. Therefore, since the stepped portion 54a of the vertical arm portion 54 comes into contact with the lower arm 22 from a certain point of time, the belt anchor fastening portion 51a is prevented from rising at a plurality of locations. Therefore, safety is improved.
[0029]
Further, in this embodiment, the upper rail 33 is formed by welding the plates 34 and 35 formed with the rail portions 34a and 35a back to back, and the fitting hole 33k is formed in the upright portion made of the same plate material as the rail portions 34a and 35a. The number of parts can be reduced.
[0030]
In this embodiment, as described above, the belt anchor link 51 rotates and is fitted so that the stopper 52 moves toward the rear inner wall surface of the fitting hole 33k when an impact load is applied to the seat belt. The rear inner wall surface of the hole 33k is configured to be provided with three steps of locking steps 33p, 33q, 33r that engage with the stopper 52 and restrict upward movement of the stopper 52. With respect to this configuration, as shown in FIG. 7, the rotation direction of the belt anchor link 51 is reversed, and the locking step portions 33p, 33q, 33r that engage with the stopper 52 on the front inner wall surface of the fitting hole 33k. A configuration is also conceivable (in FIG. 7, the same reference numerals are given to the same functional portions as those in the embodiment shown in FIGS. 1 to 4).
[0031]
When configured as shown in FIG. 7, the rotation center portion 51b of the belt anchor link 51 is disposed outside the arc-shaped fitting hole 33k centering on the pin 42, and the pin 55, the torsion spring 61, and the like are disposed there. It must be provided. However, the position of the rotation center portion 51b is in the vicinity of the center of tilting of the upper arm 23, and is a portion where the mechanical parts constituting the reclining device are clogged. For this reason, the arrangement as in the embodiment shown in FIGS. 1 to 4 is more advantageous in terms of space and is superior.
[0032]
The present invention is not limited to the embodiments described above. For example, in the above-described embodiment, the upper rail 33 is formed by bonding the plates 34 and 35 on which the rail portions 34a and 35a are formed back to back, and the fitting hole 33k is formed in the upright portion. There is no. For example, the portion for forming the fitting hole 33k may be formed of a separate member and fixed to the upper rail body.
[0033]
The torsion spring 61 may be a tension spring or the like as long as the belt anchor link 51 can be urged to rotate. The belt anchor link 51 may be any one as long as the belt anchor fastening portion 51a, the rotation center portion 51b, and the stopper 52 are arranged in a fixed positional relationship, and the outer shape does not need to be L-shaped. The stopper 52 is not limited to a columnar member with a collar as long as the strength can be maintained. Furthermore, the fitting hole 33k of the upper rail 33 may be a bottomed hole.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, when an impact load acts on the seat belt and the belt anchor link rotates, the stopper moves upward while sliding on the rear inner wall surface of the fitting hole. Engage with the first engaging step, and the movement of the occupant stops. Therefore, if the seat cushion is in the low position, the stopper is engaged with the locking step portion in the low position, and the amount of movement of the occupant when the impact load acts on the seat belt can be reduced. Further, according to the present invention, it is not necessary to arrange the rotation center portion of the belt anchor link in the vicinity of the tilt center of the upper arm of the seat having no space, and an advantageous arrangement in terms of space can be obtained.
[0035]
According to the second aspect of the present invention, if a strong impact load is applied, the locking step is deformed, the engagement between the stopper and the locking step on the low position side is released, and the stopper is more Even if it encounters a situation where it engages with the upper locking step, the belt anchor fastening part of the belt anchor link and the stopper are arranged with the lower arm in between. Since the stepped portion of the portion contacts the lower arm, the belt anchor fastening portion is prevented from rising at a plurality of locations, and safety is improved.
[0036]
According to the invention of claim 3, the number of parts is reduced by using the upper rail formed by forming a rail portion and forming the rail portion, and forming the fitting hole in the upright portion made of the same plate material as the rail portion. it can.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an embodiment of the present invention viewed from the side of a sheet.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
3 is a cross-sectional view taken along the line BB in FIG. 1. FIG.
4 is an exploded perspective view of the main part of the embodiment of the present invention shown in FIG. 1. FIG.
FIG. 5 is an explanatory diagram of a conventional technique.
FIG. 6 is an explanatory diagram of another conventional technique.
FIG. 7 is a diagram for explaining a space advantage of the present invention.
[Explanation of symbols]
21 Seat 22 Lower arm 22a Through hole 23 Upper arm 24 Seat cushion 31 Seat track 32 Lower rail 33 Upper rail 33k Fitting holes 33p, 33q, 33r Locking step portion 51 Belt anchor link 51a Belt anchor fastening portion 51b Rotation center portion 52 Stopper 53 Horizontal arm portion 54 Vertical arm portion 54a Step portion 55 Pin 56 Belt anchor bolt 57 Seat belt bracket 61 Torsion spring P Seat belt fastening portion

Claims (3)

A seat belt anchor locking structure in a seat in which a seat lower arm is configured to be vertically adjustable with respect to an upper rail of a seat track,
A belt anchor fastening portion connected to the seat belt side and a turning center portion rotatably attached to the lower arm are provided so that the belt anchor fastening portion is located behind the turning center portion, Further, a belt anchor link having a stopper projecting toward the upper rail at a position below the belt anchor fastening portion,
A spring that pivotally biases the belt anchor link so that the stopper is biased forward;
The upper rail is formed as a fitting hole with the stopper, and the rear inner wall surface is engaged with the stopper in a state where the belt anchor link is rotated against the urging force of the spring, and the stopper A fitting step provided with a plurality of steps in the vertical direction, the locking step for restricting the upward movement of
The seatbelt anchor locking structure. The belt anchor link is an L-shaped plate including a horizontal arm portion and a vertical arm portion, the rotation center portion is provided on the front end side of the horizontal arm portion, and the rear end side of the horizontal arm portion and the vertical arm The belt anchor fastening portion is provided at a crossing corner portion with the upper end side of the portion, the stopper protrudes from the lower end side of the vertical arm portion, and the longitudinal arm portion is provided at the longitudinal position at the longitudinal position. Using a stepped part formed so that the lower end side of the arm part approaches the upper rail,
As the lower arm, the one having a through hole through which the step portion of the vertical arm portion is inserted,
2. The seat belt anchor locking structure according to claim 1, wherein the belt anchor fastening portion and the stopper are arranged so as to sandwich the lower arm. 3. The seat belt according to claim 1, wherein the upper rail is formed by forming a rail portion by forming a plate portion, and the fitting hole is formed in an upright portion made of the same plate material as the rail portion. Anchor locking structure.

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