JPS646141Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to improvements in automobile seats.

(Prior Art) Generally, in an automobile seat, a tilting device is provided which divides the seat back into upper and lower halves and tilts the upper seat back back and forth relative to the lower seat back, and the portion of the lower seat back that contacts the occupant's lumbar vertebrae (seat skin). ) and a lumbar support that moves back and forth with a lumbar plate are known.

(Problem to be solved by the invention) However, in conventional car seats equipped with such a tilting device and a lumbar support, the handle or lever for adjusting the tilting is located at a separate location. As a result, it took up unnecessary space and had poor operability.

This invention was made in view of these points,
In the above-mentioned automobile seat, a rotary handle for operating a tilting device and a circular adjustment lever for advancing and retracting the lumbar plate of the lumbar support are coaxially disposed on one side of the lower seat back and in the center thereof. The object of the present invention is to provide an automobile seat that takes up a minimum amount of space and has improved operability.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a seat bag that is divided into two parts, an upper seat bag and a lower seat bag, and a tilting device that tilts the upper seat bag back and forth with respect to the lower seat bag. An automobile seat is provided with a lumbar support that is provided at a hinge joint with a lower seat back and moves back and forth a portion of the lower seat back that contacts the lumbar vertebrae of an occupant using a lumbar plate, the seat being provided with a lumbar support on one side of the lower seat back. A circular rotary handle and an adjustment lever are disposed coaxially in the center thereof, and the rotary handle is pivotally supported on the outer side of the seat back on the axis of the adjustment lever, and A lower pulley is connected to the inner side of the lower seat bag, and the tilting device is provided with an upper pulley that is interlocked with the lower pulley via a belt. A polygonal cam part is connected to the inner side of the lower seat bag on the axis, and the movable member rotated by the polygonal cam part has an upper part pivotally supported by a lower frame installed inside the lower seat bag, A long hole extending substantially vertically is formed in the lower part, and the other end of the rod member, which is rotatably supported by the lower frame and has one end fixed to the lumbar plate, is engaged with the long hole. The lumbar plate moves forward and backward using an adjustment lever.

(Function) When tilting the upper seat back relative to the lower seat back, by rotating the rotation handle, the rotational force is transmitted from the lower pulley to the upper pulley via the belt, thereby operating the tilting device. , the upper seat back tilts back and forth relative to the lower seat back to adjust to the optimum position for the occupant.

In addition, in order to advance or retreat the portion of the lower seat back that contacts the occupant's lumbar vertebrae, by rotating the adjustment lever, the polygonal cam portion also rotates, and the cam surface of the cam portion moves the movable member. Since the movable member can be controlled to rotate by a predetermined angle and moved forward and backward from the lumbar plate via the rod member, the portion of the lower seat bag that comes into contact with the occupant's lumbar vertebrae (seat skin and cushion member) can be optimized. It can be moved back and forth so that it is in the position of .

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a car seat, in which a seat back 3 is tiltably connected to a seat cushion 2 attached to the floor of a car body (not shown) via a reclining device (not shown).
A pillow-shaped head rest 4 is placed above the seat bag 3.
is installed so that its vertical position can be adjusted. The seat bag 3 is divided into two parts: an upper seat bag 3a and a lower seat bag 3b. On one side of the lower seat back 3b (in the drawing, on the right side and in the center thereof), there is a circular rotating handle 5 of a tilting device A that tilts the upper seat back 3a back and forth with respect to the lower seat back 3b, and a circular rotating handle 5 for tilting the upper seat back 3a back and forth with respect to the lower seat back 3b, and a handle for the occupant of the lower seat back 3b. An adjustment lever 6 of the lumbar support B, which moves back and forth the portion that contacts the lumbar vertebrae (seat skin and cushion member), is disposed coaxially with the adjustment lever 6, so that adjustments can be made at the same position.

Next, the internal structure of the seat bag 3 will be explained. As shown in FIGS. 2 and 3, an upper frame 7 is installed inside the upper seat bag 3a, and a lower frame 8 is installed inside the lower seat bag 3b. (Seat skin and cushion members not shown).

In the upper frame 7, a bracket 9 fixed to one side is pivotally supported by a U-shaped support member 10 fixed to the lower frame 8, while a bracket 11 fixed to the other side is mechanically supported by a tilting device A. By rotating a rotary handle 5 which is linked and thereby actuates a tilting device A, the upper frame 7 is configured to be tilted back and forth relative to the lower frame 8. That is, the upper frame 7 (upper seat back 3a) can tilt back and forth between the most forward position _P1 and the most retracted position _P2 , as shown in FIG.

The lower frame 8 also has a lumbar plate 12 at its lower portion that moves back and forth the portion of the lower seat bag 3b that contacts the occupant's lumbar vertebrae.
A lumbar support B for adjusting the position of the lumbar plate 12 is provided, and by operating the adjustment lever 6 of the lumbar support B, the lumbar plate 12 can be moved to the third position.
It can be moved back and forth between the most advanced position P ₃ and the most retracted position P ₄ shown in the figure.

Next, the tilting device A and the lumbar support B will be described in detail.

Tilting Device A As shown in FIGS. 2, 3, and 4, the eccentric cam portion 21b of the shaft member 21, which includes a first shaft portion 21a, an eccentric cam portion 21b, and a second shaft portion 21c, includes: A retaining ring 22 is fitted into the circumferential groove 21d to lock a flat washer 23, and a first gear member 24 including an external gear 24a is fitted so as to abut the flat washer 23. Further, a second gear member 25 having an internal gear 25a that meshes with the external gear 24a is fitted into the first shaft portion 21a, and is attached to a retaining ring 27 via a flat washer 26. However, the first
The outer end of the shaft portion 21a is attached to the first and second brackets 11 protruding from the upper frame 7.
Mounting members 28, 29, flat washers 30, bolts 3
It is fixed using 1. Further, the first gear member 24 is attached to a bracket 34 fixed to the lower frame 8 with a pair of bolts 32, 32 and flat washers 33, 33. Also, the second
A lower pulley 35 connected to the inner side of the lower seat bag 3b on the axis of the rotary handle 5 and an upper pulley 37 interlocked via a belt 36 are fitted into the shaft portion 21c, and are connected to each other by a locking pin 38. Fixed.

Lumbar support B As shown in FIGS. 2, 3, and 5, the lumbar support B is pivotally supported by a protruding shaft 39a of a fixed bracket 39 fixed to the lower frame 8 (installed inside the lower seat back 3b). Movable member 40 with an L-shaped cross section
is rotatably attached with a retaining ring 41.
A connecting member 4 consisting of a polygonal cam portion 42a and a shaft portion 42b is attached to the bearing portion 39b of the fixed bracket 39 with respect to the pulley shaft 35a of the lower pulley 35.
2 is fitted externally. That is, a polygonal cam portion 42a is connected to the adjustment lever 6 on the inner side of the lower seat bag 3b on the axis.

The shaft portion 42b of the connecting member 42 is fitted into the elongated hole 40a in the axial direction of the movable member 40, and
A small elongated hole 40 extending in the vertical direction at the bottom of the movable member 40
b is engaged with the other end of a rod member 43 whose one end is fixed to the lumbar plate 12 and whose middle part is rotatably supported by the lower frame 8. A coil spring 44 is interposed between the fixed bracket 39 and the movable member 40.

The outer end of the shaft portion 42b of the connecting member 42 has two chamfers and the adjustment lever 6 is fitted therein, while the rotary handle 5 is fixed to the outer end of the pulley shaft 35a of the lower pulley 35 with a screw 45. Therefore, the rotary handle 5 and the adjustment lever 6 are configured to be able to rotate independently.

With the above configuration, when the upper frame 7 is tilted relative to the lower frame 8, by rotating the rotation handle 5, the rotational force is transferred from the lower pulley 35 to the upper pulley 3 via the belt 36.
7 to rotate the shaft member 21, the internal gear 25a rotates eccentrically with respect to the external gear 24a, and as a result, the upper frame 7 tilts back and forth with respect to the lower frame 8, and the occupant (seated person) is adjusted to the optimal position. In addition, since the above two gears (external gear 24a, internal gear 25a) are built into the tilting device A and are configured to tilt steplessly, a spring member biases the upper seat back 3a to the most forward position _P3 . This spring member prevents the upper seat back 3a from inadvertently tilting and causing the headrest 4 above the upper seat back 3a to come into contact with the occupant's head, causing discomfort.

Further, in order to advance or retreat the portion of the lower seat back 3b that contacts the occupant's lumbar vertebrae, an adjustment lever 6 is required.
When the polygonal cam portion 42a is rotated, the polygonal cam portion 42a
The movable member 40 is restricted by the cam surface of the polygonal cam portion 42a, and the movable member 40 is rotated by a predetermined angle, thereby moving the movable member 40 forward and backward toward the lumbar plate 12 via the rod member 43. Therefore, the portion of the lower seat bag 3b that contacts the occupant's lumbar vertebrae (seat skin and cushion member) can be moved back and forth to the optimum position.

(Effects of the invention) As described above, in the present invention, the circular rotating handle of the tilting device of the upper seat back and the adjustment lever of the lumbar support are arranged coaxially on one side of the lower seat back and in the center. The so-called operation handle or lever can be concentrated in one place,
Minimizes space and improves operability.

Furthermore, even though the rotation handle and adjustment lever for two members (tilting device, lumbar plate) located relatively apart are provided coaxially, one end of the rod member is fixed to the lumbar plate. Since the movable member whose other end is movably engaged is rotated by the polygonal cam part, there is no need to lengthen the belt, and the tilting device is easy to operate. The polygonal cam portion can be made smaller, so there is no risk of disturbing the layout, and there is no deterioration in operability due to deterioration of the lever ratio of the rod member.

[Brief explanation of the drawing]

The drawings illustrate the embodiments of the present invention.
The figure is a perspective view of the entire automobile seat, Figure 2 is a front view of the internal structure of the seat bag with the seat skin and cushion members omitted, Figure 3 is a side view of the same, and Figure 4 is an exploded view of the main parts of the tilting device. FIG. 5 is an exploded perspective view of a main part of the lumbar support. DESCRIPTION OF SYMBOLS 1...Car seat, 2...Seat cushion, 3...Seat back, 3a...Upper seat back, 3b...Lower seat back, 4...Head rest, 5...Rotary handle, 6...Adjustment lever, 7... ...Upper frame, 8...Lower frame,
12...Lumber plate.

Claims (1)

[Scope of utility model registration request] The seat back is divided into two parts, an upper seat back and a lower seat back, and a tilting device for tilting the upper seat back back and forth with respect to the lower seat back is provided at a hinge joint between the upper seat back and the lower seat back, and comes into contact with the lumbar vertebrae of the occupant of the lower seat back. An automobile seat is provided with a lumbar support that moves the portion back and forth using a lumbar plate, and a circular rotating handle and an adjustment lever are coaxially disposed on one side of the lower seat back and in the center thereof. The rotating handle is pivotally supported on the outer side of the seat bag on the axis line from the adjustment lever, a lower pulley is connected to the rotating handle on the inner side of the lower seat bag on the axis line, and the lower pulley is connected to the tilting device. An upper pulley is provided which is interlocked with the upper seat back via a belt, the upper seat back is tilted back and forth by the rotating handle, and a polygonal cam part is connected to the inner side of the lower seat back on the axis line to the adjustment lever. The movable member rotated by the rectangular cam part has an upper part pivotally supported by a lower frame installed inside the lower seat bag, and a long hole extending substantially in the vertical direction is formed in the lower part, and the long hole has a An automobile seat, characterized in that the other end of a rod member rotatably supported by a lower frame and having one end fixed to a lumbar plate is engaged, and the lumbar plate is moved back and forth by the adjustment lever.