JPS5989236A - Device for vertically adjusting seat - Google Patents

Abstract

PURPOSE:To simplify the structure of a seat adjusting device, by associating an eccentric pin with another eccentric pin provided to a driven rotary member so that a seat frame is vertically moved by rotating the driven rotary member. CONSTITUTION:A seat frame 15 is supported through links 5, 7, 9, 10 to a lower bracket 2 secured to a floor surface by means of a seat track 1. A control mechanism 20 for vertically moving the seat frame 15 comprises A rotary shaft 4, a driven rotary member 22, a brake mechanism 25 through 30 and an eccentric pin 23. The operation of the above-mentioned rotary shaft 4 causes the rotation of the driven rotary member 22 which is impeded by the brake mechanism 25 through 30, and the eccentric pin 23 is associated with a drive link 7 so that the eccentric pin 23 vertically moves the seat frame 15, being accompanied with the rotation of the driven member 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the vertical position of a vehicle seat, particularly a front seat of a passenger car.

A seat vertical adjustment device has a basic structure in which a seat frame is supported vertically by a lower bracket fixed to the vehicle floor side via a link mechanism or the like, and the seat frame is moved vertically by some operating mechanism. have. Although various operating mechanisms have been proposed, all conventional devices use a gear mechanism or a screw mechanism to transmit the rotational force applied to the operating handle side to a link mechanism or other components. There have been problems in that play and rattling are likely to occur, and the mechanism is complicated, increasing costs.

The present invention was made for the purpose of obtaining a seat vertical adjustment device with a simple structure without using a gear mechanism or a screw mechanism.
As a drive mechanism), the driven rotating body rotates depending on the rotational force applied to the operating shaft, and when the rotational force is applied to the driven rotating body side, a braking effect is generated.Using this mechanism, the driven rotating body of this operating mechanism is moved to an eccentric position. The present invention is characterized in that an eccentric pin is provided upright, and this eccentric pin is linked to a drive link of a link mechanism between the seat frame and the lower bracket so that the seat frame moves up and down as the driven rotating body rotates. .

The invention will now be described with reference to the illustrated embodiments. A lower bracket 2.2 provided on the well-known left and right seat trunks 1, 1 has seat back access seats 3, 3 at the rear,
It moves in the longitudinal direction with respect to the vehicle floor surface together with the sliding rail of the seat track I.

There is a rotation shaft 4 between the front parts of the left and right lower brackets 2.2.
is rotatably spanned, and links 5.5 are fixed to both ends of the rotating shaft 4 by welding or other fixing means. The rotation shaft 4 has a rotation center hole 4a in its both end shaft portions.
4a, and a rotation center pin 6.6 fixed to the lower bracket 2.2 is fitted into the rotation center holes 4a, 4a and supported. Among the left and right links 5.5, the left link 5 is L-shaped with arms 5a and 5b, but the right link 5 further integrally has a drive link 7 in addition to the arms 5a and 5b. It is approximately T-shaped.

On the other hand, abbreviated links 9, 9 are pivotally connected to the rear portions of the lower plackets 2, 2 via pins 8.8, and the lower arms 9a, 9a of these links 9.9 and the links 5.5 The lower arms 5a, , 5a of are connected via interlocking links 10.10.

11 and 12 are connection pins at both ends of the interlocking link 10.

A pin 13a is attached to the tip of the other arm 5b, 5b of the links 5, 5.
, 13a, the lower end of escape link 13.13 (7) is pivotally connected to the other arm 9b of links 9,9.

A mounting bracket (14.14) is pivotally attached to the tip of 9b. The seat frame 15 is rotatably connected to the mounting brackets 14, . 14(7) It is fixedly connected to the L-shaped portions 14a and 14a. Therefore, the link 5.9, the rotation shaft 4 and the interlocking link 10 constitute a link mechanism that supports the seat frame 15 vertically movably with respect to the lower brackets 2, 2. For example, the drive link 7 supports the rotation shaft 4. Rotate to move the seat frame up and down. Escape link 13.13
This is to ensure the movement when a difference is given to the amount of lift between the front and rear links 5 and 9.

An operating mechanism 20 is provided on the outside of the right lower bracket 2 at a position slightly above the rotating shaft 4. This operating mechanism 20 has a driven rotating body 22 (FIGS. 2, 3, and 5) that rotates when the operating handle 21 rotates.
and an eccentric pin 23 at an eccentric position of this driven rotating body 22.
has been erected. The operating handle 21 has a double pipe structure and is expandable and retractable. The eccentric pin 23 projects toward the drive link 7 through an arcuate window 24 formed in the lower bracket 2, and after being fitted into the long hole 7a of the drive link 7, the head is caulked to prevent it from coming out. Rotation center 01 of driven rotating body 22
and the rotation center of the drive link 7, that is, the axis 0 of the rotation shaft 4
2 are vertically spaced apart from each other by a certain amount d. Therefore, when the driven rotating body 22, that is, the eccentric pin 23, rotates by an angle B in FIG. It will rotate by angle A around . Both ends of the arcuate window 24 come into contact with the stopper portion 23a at the base of the eccentric pin 23, and function to restrict the rotational range of the driven rotating body 22 and, in turn, the amount of downward movement of the seat frame 15. The stopper portion 23a has a thickness equal to or greater than the thickness of the welding flange 6a of the rotation center pin 6, and
It also has the function of ensuring that the drive link 3 can be fitted into the elongated hole 7a of the drive link 7.

In the operating mechanism 20, when the operating handle 21 is rotated, the driven rotating body 22 rotates in conjunction with the rotating operation handle 21, but when rotational force is applied to the driven rotating body 22 from the seat frame 15 side, that is, from the drive link 7 side. has a braking action to prevent its rotation, and as shown in Figures 3, 5, and 6.
It has the configuration shown in the figure. A cylindrical stopper case 25 is fixed to the outside of the lower bracket 2.
A core 27 integrated with the operating shaft 26 is located therein. The operating handle 21 is fixed to the end of the operating shaft 26 protruding from the case 25. The core 27 has two fan-shaped notches 28a and 28b, and in one of the notches 28a there is provided a claw portion of the driven rotating body 22 which can be rotated by fitting a shaft pin 22a into a shaft hole 27a of the core 27. 29 is inserted with a certain circumferential play.

A torsion spring 30 is inserted between the stopper case 25 and the core 27, and an inwardly bent part 30a formed in the middle part of the torsion spring 30 fits into the groove 29a of the claw part 29 of the driven rotating body. When the rotating body 22 rotates, the diameter of the spring 30 is immediately expanded to generate a braking force between the spring 30 and the inner wall of the case 25. hook portions 30b at both ends of the other spring 30;
30c is located within the other notch 28b of the core 27, and when the core 27 (operating shaft 26) rotates, it is pressed by the end of the notch 28b, causing the spring 30 to contract in diameter. A gap A between the core 27 and the spring 30 or the claw portion 29
, B, C, D (see Figure 6), A+D or B+
C is the spring 3 against the load from the driven rotating body 22 side.
0 expands in diameter to ensure the amount of change necessary to maintain braking force, and when the core 27 side is rotated and gap A (or B) is set to 0, C (or D
) is set so as to ensure a contraction margin (winding margin) that allows the spring 30 to be compressed and rotated. Note that there is a driven rotating body 22 between the case 25 and the lower bracket 2.
An annular plate 31 for preventing removal is sandwiched and supported in contact with the periphery of the plate.

In the above operating mechanism 20, when the core 27 (operating shaft 26) is rotated to the left (right) in Fig. 7fS6 via the operating handle 21, the hook portion 30b (30C) of the spring 30 is pressed and rotated by the end of the notch 28b. As a result, the diameter of the spring 30 is reduced.

When the core 27 is further rotated, the ends of the notches 28a and the ends of the claws 29 come into contact with each other, and the driven rotating body 22 is rotated to the left (right) together with the core 27.

On the other hand, when either the left or right rotational force is applied to the driven rotating body 22 side, the claw portion 29 and the spring 30 are held together without play by the groove 29a and the inwardly bent portion 30a, so the claw portion 29 is Immediately, the diameter of the spring 30 is expanded to generate a large breaker due to friction between the spring 30 and the case 25, thereby preventing the rotation of the driven rotary body 22. The above-mentioned stopper annular plate 31 prevents the force applied to the driven rotary body 22 in the direction of coming out of the shaft hole 27a of the core 27, thereby ensuring the above-mentioned braking action.

Therefore, according to the present device having the above configuration, the operating handle 2
By rotating 1, the seat height can be adjusted freely, and even if you sit on the seat after adjusting the height, the seat will remain at the adjusted height position. That is, when the operating handle 21 is rotated, the driven rotary body 22 rotates as described in L, and the eccentric pin 23 erected thereon swings the drive link 7, so that the rotation of the rotation shaft 4 and the link The seat frame 15 moves downward by -E due to the swing of 5.7. When a descending force (or a rising force) is applied to the receipt frame 15 side to turn the drive link 7 A and apply rotational force to the driven rotary body 22, the above-mentioned braking action is applied and the seat frame 15 is It never goes down (or up).

The operating mechanism 20 shown in the embodiment described above has been separately filed by the applicant for a patent (Japanese Patent Application No. 57-34570).
Since it is locked to the pawl portion 29 of No. 2, it is characterized in that it is possible to obtain a braking action without play in response to rotations applied to the rotating body 22 in either forward or reverse directions. However, the present invention can also obtain the same function by using the operating mechanism 20° shown in FIG. 7, which is widely used in conventional vehicle head restraints, wind regulators, etc., and which does not engage the torsion spring and the claw portion 29. be able to.

This operating mechanism 20'' has only one fan-shaped notch 28a in the core 27, the claw portion 29 of the driven rotating body 22 is located in this notch 28a, and the hook portions 30b of the torsion spring 30 are located at both ends of the notch 28a. , 30c are engageable, and have substantially the same functions as the operating mechanism 20 described above. The present invention can also use operating mechanisms having other configurations as long as they have the same functions as those described above.

In the above embodiment, a special drive link 7 is provided as a link that links the eccentric pin 23, but the operating mechanism 20
It is also possible to use other links, for example, some of the links 5 and 9, as drive links if conditions such as the installation position of the links permit.

In summary, the present invention links the drive link of the link mechanism that supports the seat frame in a vertically movable manner with an eccentric pin provided on the driven rotating body of the operating mechanism, so that the seat frame moves up and down by the rotation of the driven rotating body. Therefore, the structure is simpler and cheaper than conventional devices using a double mechanism, a screw mechanism, etc., and there is no room for play or backlash. Further, when a force is applied from the seat side to the driven rotary body of the operating mechanism, the brake mechanism is activated and the seat is not rotated, so that the seat can be stably held at the position after height adjustment.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the seat vertical adjustment device according to the present invention, and FIGS. 2, 3, 4, and 6 are lines II-II and ■-■ in FIG. 1, respectively. line, IV-IV
5 is an exploded perspective view of the operating mechanism, and FIG. 7 is a sectional view similar to FIG. 6 showing another example of the operating mechanism. 2... Lower bracket, 4... Rotation shaft, 5, 9
... Link, 6... Rotation center pin, 7... Drive link, 10... Interlocking link, 15... Seat frame, 20... Operating mechanism, 21... Operating handle, 2
2... Driven rotating body, 23... Eccentric pin, 24...
Arc-shaped window, 25...stopper case, 27...core,
30... Torsion spring, 31... Annular plate to prevent removal. 1 Figure 4] Figure

Claims (1)

[Claims] (1) Lower bracket fixed to the vehicle floor side. In a seat vertical adjustment device that includes a seat frame that is vertically movably supported by the lower bracket via a link mechanism, and an operating mechanism that moves the seat frame up and down, the operating mechanism is rotatably operated. It has an operating shaft, a driven rotating body that rotates when the operating shaft is rotated, and a brake mechanism that prevents rotation when rotational force is applied to the driven rotating body. and an eccentric pin is erected at an eccentric position of the driven rotating body, and the eccentric pin is linked with a drive link of the link mechanism so that the seat frame moves up and down as the driven rotating body rotates. A seat vertical adjustment device featuring: (2. In claim 1, the operating mechanism is supported by a lower bracket, and the eccentric pin protrudes toward the drive link from an arcuate window bored in the lower bracket, and At both ends are seat vertical adjustment devices that regulate the rotation range of the eccentric pin and the amount of vertical movement of the seat frame.