JPH035142Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a front seat for a vehicle, and more particularly to a front seat for a vehicle whose position is adjustable in the longitudinal direction and the vertical direction.

(Prior art) As a type of front seat for a vehicle, a seat cushion is attached to a pair of left and right lower rails that are fixed to the vehicle body floor and extend in the front-rear direction, and is slidably attached to these lower rails in the longitudinal direction via a support member. Some seat trucks are equipped with a pair of left and right seat tracks consisting of upper rails supporting both sides, and at least one of these seat tracks is equipped with a locking mechanism for releasably locking both of the rails. In such a front seat, the position of the seat can be adjusted in the longitudinal direction by unlocking both rails of the seat track, so that if the seated person is small, the seat can be adjusted forward. Furthermore, if the seated person is large, the seat is adjusted to the rear.

By the way, in such a front seat,
In order to prevent the seated person's thighs from separating from the upper front end of the seat cushion and causing the legs to wobble from side to side, a first vertical position adjustment mechanism (front In addition, a second vertical position adjustment mechanism (rear height adjuster) is provided to adjust the position of the rear side of the seat cushion in the vertical direction in order to improve the forward visibility of the occupant and adjust the cushion seating angle. star)
will be provided. FIG. 15 shows an example of a conventional front seat, in which the front part of the seat cushion S is adjusted in the vertical direction within a range of α1 by operating the front height adjuster handle 1. By operating the rear height adjuster handle 2, the position of the rear part of the seat cushion S is adjusted in the vertical direction within the α2 range.
As a result, the cushion seat angle .theta. can be adjusted, for example, within the range of 13 DEG to 22 DEG, regardless of the longitudinal position of the front seat, as shown in FIG.

However, in such a front seat, the front position is within the range of use by small-sized occupants, and the cushion seating angle θ is preferably small, while the rear position is within the range of use by large-sized occupants, and the cushion seating angle θ is preferably small. For example, it is appropriate for the angle to be about 13 degrees at the front position and about 18 degrees at the rear position, and an adjustment amount of approximately ±2 degrees based on this value is sufficient, which corresponds to region A in FIG. 16. Therefore, in the conventional front seat, the areas B1 and B2 in the figure are meaningless and wasted areas.

(Purpose of the invention) The present invention was made with attention to the above-mentioned actual situation, and its main purpose is to adjust the cushion seating surface as the front seat moves from the front to the rear when adjusting its position in the longitudinal direction. By configuring the seat so that the angle θ becomes large, one of the vertical position adjustment mechanisms is omitted, thereby reducing the weight and cost of the front seat.

(Structure of the invention) In order to achieve the above object, the present invention provides the above-mentioned front seat for a vehicle, in which both seat tracks bulge upward and are gradually lowered while the seat moves from the frontmost position to the rearmost position. The seat cushion is assembled to the support member so as to be movable by a predetermined amount in the vertical direction, and a vertical adjustment mechanism for the front side or the rear side is provided between the seat cushion and the seat track. Its structural feature lies in the fact that it is provided with.

(Operations and Effects of the Invention) As a result, in the present invention, by setting the curved shape of both seat tracks to a predetermined curvature, the cushion seat angle θ at the forward position of the front seat is made small, and the front seat is 16, the cushion seating surface angle θ can be gradually increased as the cushion seating surface angle θ is shifted to the straight line a in the area A in FIG. Therefore, the cushion seat angle θ may be adjusted within a range of approximately ±2°, and either the vertical adjustment mechanism for the front side or the rear side of the seat cushion is sufficient. Therefore, according to the present invention,
The other vertical adjustment mechanism can be omitted, thereby making it possible to reduce the weight and cost of the front seat.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings. FIG. 1 shows a front seat according to the present invention. As shown in FIGS. 1 to 4, the front seat has a pair of left and right seat tracks 11 and 12, and a left seat track 1.
The seat cushion S1 is provided with a locking mechanism 13 that releasably locks the upper rail 11a and lower rail 11b of 1, and a rear height adjuster 20, and the seat cushion S1 can be moved by a predetermined amount in the vertical direction on the lower arm 14, hinge plate 15, etc. supported,
Further, the seat back S2 is supported by a lower arm 14 and a hinge plate 15 so as to be tiltable in the front-rear direction. The inclination angle of the seat back S2 is adjusted by a reclining adjuster (not shown).

The upper rails 11a, 12a and the lower rails 11b, 12b constituting both seat tracks 11, 12 are formed in a curved shape that bulges upward and gradually descends from the front end to the rear end. is attached to each lower rail 11b, 12b so as to be slidable in the longitudinal direction. Further, the left upper rail 11a is locked to the lower rail 11b by a locking mechanism 13, and is unlocked by rotating the seat track handle 13a of the locking mechanism 13 and becomes slidable. This left side top rail 11a
A hinge plate 15 and a top bracket 16 are fixed and stand up on the top surface, and a top rail 1
A lower arm 14 is fixed and stands up on the upper surface of 2a.

The rear height adjuster 20 is a link mechanism 20
It is roughly divided into an operating mechanism 20b and an operating mechanism 20b. The link mechanism 20a includes first to fourth links 21a, 21b, 21
c, 21d, and a connecting rod 22 integral with the third link 21c and the fourth link 21d. The first link 21a is rotatably supported at its upper end on the front inner surface of the lower arm 14, and the third link 21c and the fourth link 21a are
As shown in FIG. 5, the connecting rod 22 having the connecting rod 1d fixed to both ends thereof is rotatably supported at the rear lower part of the lower arm 14 and the lower part of the hinge plate 15. The second link 21b is rotatably connected at its front end to the lower end of the first link 21a,
The rear end portion thereof is rotatably connected to one rotating end portion of the third link 21c. As a result, the rotation of the first link 21a is controlled by the rotation of the second link 21b.
is transmitted to the third link 21c via the connecting rod 22, and is transmitted to the fourth link 21d via the connecting rod 22. Third link 21c and fourth link 21d
are attached to both rear sides of the seat cushion S1 by attachment bolts 17a and 17b inserted through arcuate grooves 14a and 15a provided in the lower arm 14 and hinge plate 15, respectively. Support arms 14b and 16a, which are rotatably supported by the lower arm 14 and the upper bracket 16, are attached to both sides of the front portion of the seat cushion S1 by attachment bolts 17c and 17d. As a result, the seat cushion S1 has both links 21c,
21d and both support arms 14b and 16a, and the rear side moves a predetermined amount in the vertical direction by rotation of the first link 21a.

As shown in FIGS. 3, 4, and 6, the operating mechanism 20b has a ratchet 23, a pawl 24, a cam plate 25, and an operating lever 26 as main components. The ratchet 23 is fixed to the front outer surface of the lower arm 14. Further, the pawl 24 is attached to a cam plate 25, and is supported by the lower arm 14 together with the cam plate 25, the operating lever 26, and the first link 21a via a shaft 27a. This pole 24 is
As shown in FIG. 7, a pair of swing levers 24a, 2
4a, and a compression spring 24b interposed on the outer end side thereof, and the inner end claw portion thereof engages with the ratchet 23 by the biasing force of the compression spring 24b. In addition, both swing levers 2
An operating lever 26 is located between the inner end sides of 4a and 24a.
A cam pin 27b that is implanted in the cam plate 25 and passes through the arcuate groove 25a of the cam plate 25 is interposed. This cam plate 25 is fixed to a shaft 27a, and the operating lever 26 is rotatably supported by the shaft 27a. As a result, when the operating lever 26 is rotated in the direction of the arrow in FIGS. 1 and 4, one side of the pawl 24 is rotated while the cam pin 27b rotates along the arcuate groove 25a of the cam plate 25 at the beginning of the rotation. The lever 24a is rotated counterclockwise in FIG. 7 to release the engagement with the ratchet 23. As a result,
Rotate the operating lever 16 further to release the cam pin 2.
When the cam plate 25 is rotated by the action of 7b, the pawl 24 and shaft 27a are rotated integrally with the cam plate 25, and at the same time, the first link 21 is rotated.
Rotate a. During this period, when the rotation operation of the operation lever 26 is released, the swing lever 24a returns and both swing levers 24a, 24a are moved to the ratchet 2.
3, and the operating lever 26 is locked at its operating position.

The rear height adjuster 20 includes a torsion bar 28 that reduces the operating force of the operating lever 26. The torsion bar 28 is the link mechanism 2
It is provided parallel to the connecting rod 22 of 0a,
As shown in FIG. 2, the rear end hook portion is supported by the connecting rod 22 and passes through the lower arm 14, and has one end fixed to a pin 14c provided on the lower arm 14 and the other end provided on the fourth link 21d. It is latched to. Thereby, the torsion bar 28 urges the third link 21c and the fourth link 21d in a direction to move the seat cushion S1 upward.

In the front seat configured in this manner, the upper rail 11 is moved relative to the lower rail 11b by rotating the seat track handle 13a.
The position of the seat in the longitudinal direction can be adjusted by releasing the lock of a, and by rotating the operating lever 26, the rear side of the seat cushion S1 can be moved up and down via the link mechanism 20a, and the cushion seating surface can be adjusted. The angle θ can be adjusted.

Figures 8a and 8b schematically show how the front seat is adjusted in the longitudinal direction; Figure 8a shows a petite woman moving the seat to the frontmost position; Figure b shows a large man with his seat moved to the rear. For the front seat, both seat tracks 1
1 and 12 are formed in a curved shape that bulges upward and gradually descends from the front end to the rear end, and when the seat is located at the frontmost position, both seat tracks 1
1 and 12, and descends along the curved shape as the seat is moved rearward. Therefore, the cushion seat angle θ gradually increases as it moves from the frontmost position to the rearmost position, and by appropriately selecting the radius of curvature of both seat tracks 11 and 12, can be changed as shown by straight line a. Therefore, the subsequent adjustment of the cushion seat angle θ may be within a range of, for example, about ±2°, and the rear height adjuster 20 is sufficient for adjustment within this range. As a result, the front height adjuster is unnecessary and can be omitted, thereby making it possible to reduce the weight and cost of the front seat. In addition, Fig. 8c
1 shows a model of a conventional front seat. In this seat, both seat tracks are straight, so the cushion seat angle θ does not change when the position is adjusted in the longitudinal direction. The two-dot chain line in Figure c indicates the seat position adjustment state in Figure b.

(Modification) FIG. 9 shows a modification of the torsion bar assembly means in the above embodiment. In this modification, a torsion bar 28A is inserted through the connecting rod 22 and has one end connected to the pin 14.
c, and the other end is fixed to a pin 22a fitted to the other end of the connecting rod 22.

10 and 11 show a modification of the support means for the front portion of the seat cushion in the above embodiment. In this modified example, a cushion member 18 is attached to the front inner surface of the lower arm 14 and the inner surface of the upper bracket 16 in place of the support arms 14b and 16a, and the seat cushion S1 is connected to the lower arm via these cushion members 18. 14 and an atspa bracket 16. The cushion member 18 can be bent by a predetermined amount in the front-rear direction, so that the seat cushion S1
It is possible to prevent rattling of the support part and generation of abnormal noise.

12 and 13 show another variant of the support means for the front part of the seat cushion. In this modification, support arms 14b, 1
A plate 19 having an elongated hole 19a is fixed in place of the elongated hole 6a, so that mounting bolts 17c and 17d at the front of the seat cushion S1 can move back and forth within the elongated hole 19a. This simplifies the support structure compared to the case where support arms 14b and 16a are used.

FIG. 14 shows a modification of the link mechanism in the above embodiment. This link mechanism 20A
, the lower end of the first link 21a is rotatably supported on the front inner surface of the lower arm 14, and the front end of the second link 21b is connected to the upper end of the first link 21a. Thereby, by using the link mechanism 20A, the seat cushion S1 can be gradually lowered from the state S'1 to the state S''1.

Although the rear height adjuster 20 was used in the above embodiment, a front height adjuster can be used in place of this in the present invention, and the same effects as in the above embodiment can also be obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a front seat according to an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the link mechanism of the seat track and rear height adjuster in the front seat, and Fig. 3 is a schematic side view of the front seat according to an embodiment of the present invention. Expanded perspective view of the operating mechanism in the star, 4th
The figure is an enlarged side view of the height adjuster, Figure 5 is a sectional view taken along the - line in Figure 4, Figure 6 is a sectional view taken along the - line in Figure 4, and Figure 7 shows the latch in the operating mechanism. Enlarged side view of pole, Figure 8a,
FIG. 9 is a perspective view showing a modification of the torsion bar assembly means, and FIG. 10 is a modification of the support means for the front part of the seat cushion. Side view shown, first
Figure 1 is a sectional view taken along the line XI-XI in Figure 10;
The figure is a side view showing another modification of the support means, the first
3 is a sectional view taken along the - line in FIG. 12, FIG. 14 is a side view showing a modification of the link mechanism, and FIG.
FIG. 5 is a schematic side view showing a conventional example of a front seat, and FIG. 16 is a diagram showing the relationship between the seat position and cushion seat angle in the front seat. Explanation of symbols, 11, 12... Sheet track, 1
1a, 12a...Atsupa rail, 11b, 12b...
Lower rail, 20...Rear height adjuster, 20
a...Link mechanism, 20b...Operation mechanism, 21a-2
1d...Link, 22...Connection rod, 23...Ratchet, 24...Pole, 25...Cam plate, 26
...Operation lever, 28...Torsion bar, S1...Seat cushion, S2...Seat back.

Claims (1)

[Scope of utility model registration request] A pair of left and right lower rails fixed to the vehicle body floor and extending in the longitudinal direction, and upper rails each attached to the lower rails so as to be slidable in the longitudinal direction and supporting both sides of the seat cushion via support members. and a locking mechanism for releasably locking both the rails on at least one of these seat tracks,
Both seat tracks are formed into a curved shape that bulges upward and gradually descends as the seat moves from a forwardmost position to a rearmost position, and the seat cushion is moved by a predetermined amount in the vertical direction on the support member. What is claimed is: 1. A front seat for a vehicle, wherein the vehicle front seat is capable of being assembled and is provided with a vertical adjustment mechanism for the front side or the rear side between the seat cushion and the seat track.