JPH0122538Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat used in, for example, an automobile, and particularly to a structure for holding the side portions of the back while appropriately changing the seating feeling on the back.

Recently, regarding seats used in automobiles,
In order to enjoy a light drive, an air lumbar seat has been developed that has an air bag built into the seat back and injects air into the air bag to raise the seating surface of the seat bag by an appropriate amount. However, although this air lumbar seat can apply moderate pressure to the area around the lumbar vertebrae in the back depending on the amount of air injected into the air bag, the seating surface of the seat bag swells in a mountain shape around the back. , it is not possible to maintain the side parts of the back while appropriately changing the feeling of sitting on the back.

In view of the above-mentioned conventional situation, the present invention provides a through hole that penetrates the seat bag in the front and rear direction, and by swingably supporting the main backrest part in this through hole, the seat bag can be attached to both sides of the through hole. To provide a seat capable of holding the side parts of the back while appropriately changing the sitting feeling of the back by cooperating with the depression of a side back rest part located on the side and a main back rest part.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of embodiments of an automobile seat according to the present invention will be described with reference to the drawings. As shown in FIG. 1, this automobile seat includes a seat cushion 1 that is installed on the floor panel of an automobile (not shown), and a seat back 2 is attached to the seat cushion 1. is tilted forward and backward by operating the operating lever 3 of the reclining mechanism, so that an appropriate backrest angle can be selected.
A headrest 4 is installed on the top of the seat bag 2, and the seat bag 2 is provided with a through hole 5 that penetrates the seat bag 2 in the front-rear direction, and a pair of side back rests 6, 6 are formed on both sides of the through hole 5. has been done. This pair of side backrest parts 6, 6
As shown in the second figure, swing arms 7, 7 are fixed to the lower part of the seat cushion 1, respectively, and a support shaft 8, which is horizontally suspended at the rear of the seat cushion 1, is rotatably attached to these swing arms 7, 7. It's embedded. Engaging teeth 9 of the reclining mechanism are engraved on one of the swing arms 7, 7, and a locking member 10 of the reclining mechanism pivotally supported on the seat cushion 1 engages with the engaging teeth 9. The locking member 10 can be freely engaged with and disengaged from the engagement teeth 9 by operating the operating lever 3.

On the other hand, as shown in the first figure, a main back rest part 11 is supported by the pair of side back rest parts 6, 6 so as to be swingable about its lower part as a pivot point. This main back rest part 11 is smaller than the through hole 5, and the seating surface 11a constituting the back rest surface of the main back rest part 11 has a gently bulging portion around the third lumbar vertebrae. This main backrest part 11
As shown in FIGS. 2 and 3, a support shaft 13 that is rotatably fitted into a mounting hole 12 formed in the swing arm 7 is horizontally suspended on both sides of the lower part of the swing arm 7. As shown in the fourth figure, a small-diameter stopper pin 15 is installed on this support shaft 13, and the stopper pin 15 is located in a regulation hole 14 formed in a part of the mounting hole 12. Therefore, the range of swing of the main back support portion 11 is restricted. A pair of support shafts 16, 1 are provided on the back surface of the main backrest portion 11.
6 are planted at predetermined intervals in the left-right direction. The pair of support shafts 16, 16 are located above the support shaft 13. These support shafts 16, 16 are provided with spiral compression springs 17, 17, and a pair of mounting holes 18, respectively.
A press plate 19 having a hole 18 is fitted thereinto, and a support shaft protruding from the attachment holes 18, 18 of the press plate 19 has attachment holes 20, 20 bored therein. Split pins 21, 21 are fitted into these mounting holes 20, 20 to prevent the press plate 19 from coming off. Therefore, the compression springs 17, 17 are interposed between the main back support portion 11 and the pressing plate 19 in a compressed state.

On the other hand, behind the pressing plate 19, as shown in FIGS. 1 to 3, an operating shaft 22 is disposed laterally, and both ends of the operating shaft 22 are bored by a pair of left and right support plates 23, 23. Support holes 24, 24
It is fitted in so that it can rotate freely. The support plate 2
3, 23 are mounting screws 25, 2 on the swing arms 7, 7.
It is fixed at 5. Operating knobs 26, 26 are respectively fixed to both ends of the operating shaft 22 protruding outward from the support holes 24, 24, and a pair of cams 27, 2 are fixed to the center of the operating shaft 22.
7 are fixed at a predetermined distance in the axial direction of the operating shaft 22. These cams 27, 27 are formed in a rectangular shape, and four circumferential cams 28, 29, 30, 31 are formed on the outer circumferential surface thereof in a relatively wide and flat shape. These peripheral cams 28-3
1 is in contact with the pressing plate 19, and due to the contact of the circumferential cams 28 to 31 with the pressing plate 19, the main back support part 11 is rotated around the support shaft 13 while the compression springs 17, The seat bag 2 is held elastically in a state where it is urged toward the backrest of the seat bag 2 with an elastic force of 17. Stopping of the main backrest part 11 in the direction of the backrest is always ensured by the stopper pin 15 coming into contact with the front wall of the regulating groove 14.

Further, the distances of the circumferential cams 28 to 31 from the operating shaft 22 are as shown in FIG.
The relationship is l ₁ < l ₂ < l ₃ < l ₄ . Therefore, the strength of the restoring force of the compression springs 17, 17 can be changed as appropriate by manually rotating the operating shaft 22 and varying the circumferential cams 28 to 31 that are in sliding contact with the pressing plate 19.

According to the embodiment configured as above,
The main back rest part 11, which is smaller than the through hole 5, is swingably supported by the side back rest parts 6, 6, so that the seated person can rest their buttocks on the seat cushion 1 and rest their back on the seat back 2. When the person leans back, the main backrest 11 is swung rearward from the solid line shown in FIG. 6 to the imaginary line shown in FIG. 6 due to the weight of the seated person. Therefore, the main backrest part 1
1 maintains appropriate cushioning properties and is recessed further than the side back rests 6, 6, so that the central part of the seated person's back is elastically held by the main back rest 11 and the back of the seated person is Both side portions S ₁ and S ₂ are maintained in a state where they receive pressing force from the side back rest portions 6 , 6 . As a result, the seat bag 2 can be made thinner and less bulky than conventional ones, so that the weight of the seat can be reduced.

Moreover, according to the embodiment, the main back rest part 11 is less depressed, and both back side parts S ₁ , S ₂
If you do not feel much pressure and would like to obtain a strong pressure, rotate the operating shaft 22 and bring the circumferential cams 28, 28 located at the smallest distance _l1 into contact with the press plate 19. Depending on this, the compression length of the compression springs 17, 17 may be made the longest. That is, since the restoring force of the compression springs 17, 17 is the weakest, when the back rests against the main back rest part 11, the difference between the side back rest parts 6, 6 and the main back rest part 11, that is, the main back rest The depth of depression of the portion 11 is maximized, the central part of the back of the seated person is deeply held, and the feeling of pressure from the side backrest portions 6, 6 becomes stronger. Also, contrary to the above, both sides of the back
If the pressing feeling of S ₁ and S ₂ is strong, the operation shaft 22 may be rotated to bring the circumferential cams 31, 31 located at the largest distance l ₄ into contact with the pressing plate 19. That is, since the restoring force of the compression springs 17, 17 is the strongest, when the back rests against the main back rest 11, the degree of depression of the main back rest 11 is minimized, and the central part of the back of the seated person is shallow. It is held and the feeling of pressure from the side back rests 6, 6 becomes weaker.

In addition, in the above embodiment, the seat bag 2
In the present invention, the support shaft 8 and the support shaft 13 of the main backrest part 11 are constructed of separate members and arranged at different positions.
3 may be arranged coaxially or coaxially. Furthermore, although the above embodiments have been exemplified as automobile seats, the present invention is also applicable to seat chairs, chaise longues, and other chairs.

As explained above, according to the present invention, a through hole passing through the seat back in the front and back direction is provided in the seat bag, and a pair of side back rests are formed on both sides of this through hole, and the side back rests have the above-mentioned side back rests. A main back rest part smaller than the through hole is swingably provided, and the main back rest part is elastically supported against the side back rest part in a state in which it is biased toward the backrest of the seat bag. Not only can the sitting feeling of the back be appropriately changed by the recess of the part and the pair of side back rests, but also the side parts of the back can be precisely adjusted while changing the sitting feeling of the back. can be retained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an automobile seat to which the present invention is applied, Fig. 2 is a sectional view taken along the line - - in Fig. 1, and Fig. 3 is an exploded perspective view with a portion cut away when viewed from the direction of the arrow in Fig. 1. , FIG. 4 is a sectional view of the seat around the support shaft 13, FIG. 5 is a schematic configuration diagram of a cam in the same seat, and FIG. 6 is a sectional view taken along the line -- in FIG. 1. 1... Seat cushion, 2... Seat back, 5... Through hole, 6... Side backrest part, 11
...Main back rest, 13...Spindle, 17...Compression spring, 27...Cam.

Claims (1)

[Scope of utility model registration request] In a seat consisting of a seat cushion on which the buttocks are seated and a seat bag on which the back is rested, a through hole is provided that penetrates the seat bag in the front and back direction, and a pair of side back rests are formed on both sides of the through hole, and A main back rest smaller than the through hole is swingably attached to the pair of side back rests, and the main back rest is elastically supported in the direction of the backrest of the seat bag. Features a sheet.