JP2601366Y2 - Tilt lock structure forward of the seat back - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger seat of a vehicle, a ship, an aircraft, or the like, and more particularly, to a tilt lock structure for a seatback in which a shoulder harness is mounted on a seatback.

[0002]

2. Description of the Related Art Conventionally, a reclining device for a passenger to use a seat back by inclining the seat back appropriately is conventionally provided in a passenger seat of a vehicle, a ship, an aircraft, or the like, and when a shock is applied to the seat. Is equipped with seat belts to protect passenger safety. In general, this type of reclining device is configured such that a seat back frame is rotatably fixed to a rear support portion of a spreader constituting a base frame, and a seat lock device is cooperated with a lower end portion of the seat back frame to cooperate with the seat back frame. The seat back frame is reclined back and forth by extending and retracting the lock device.

[0003] Further, especially in the case of passenger seats arranged in the front row, it is desired to equip a seat back with a so-called shoulder harness (shoulder type seat belt) in order to improve passenger safety. I have. A passenger seat equipped with this type of shoulder harness has a structure in which the load of the passenger when an impact occurs is supported by the seat back itself via the shoulder harness.

[0004]

By the way, the above seat lock device, which is configured as a seat reclining device, can support a large load in the compression direction, that is, the direction in which the seat back is rotated and inclined backward. The structure is such that only a small load can be supported in the extension direction, that is, the direction in which the seat back stands upright. In addition, when the seatback is folded forward during storage, and in use, the seatback is configured with a breakover arm for gripping the seatback frame with a predetermined strength and standing up and fixing the seatback in a use state. When a load of, for example, about 30 lbs is applied to the back, even if the seat back frame is fixed by the seat lock device, the seat back is folded forward, and a large forward load cannot be supported.

[0005] Therefore, when this kind of passenger seat is equipped with the above-mentioned shoulder harness, the seat back itself does not have a structure capable of supporting the load applied to the front thereof. There is a problem that the seat back is easily inclined or folded forward due to a forward load applied to the back, and it becomes meaningless to equip the seat back with the shoulder harness.

The present invention has been made in view of the above-described problem, and a lock rod is interposed in a shaft supporting portion of a seat back frame with respect to a spreader so as to prevent a forward rotation of a seat back. It is an object of the present invention to provide an inclined lock structure of a seat back that can be configured to receive a load applied to a seat back via a shoulder harness.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a forward-sloping lock structure for a seat back according to the present invention is provided for a passenger seat mounted on a vehicle, a ship, an aircraft or the like.
A pair of right and left spreaders each including a front support portion 6a that is stretched substantially horizontally between the front and rear beams 3 and 4 that constitute the reclining device, and a rear support portion 6b that is inclined and protrudes above a rear portion of the front support portion 6a. And a lower end portion 2a of the seat back frame 2 on the rear support portion 6b of the spreader 6.
Of the seat back frame 2 is formed on the base frame 5 above the support portion 8 of the seat back frame 2 with respect to the rear support portion 6b of the spreader 6 in the base frame 5 having a structure for rotatably supporting the seat back frame 2. At the same time, an arm 13 is fixedly provided at the rear end of the front supporting portion 6a of the spreader 6, and a guide hole 14 formed in the upper portion of the arm 13 and facing the bearing portion 2b formed in the seat back frame 2 is formed. The upper end 15a of the seat back 15 is rotatably fixed to the bearing 2b of the seat back frame 2, and the lower end 15b of the lock rod 15 is inserted into the guide hole 14 of the arm 13 to recline the seat back frame 2. The lower end 15b of the lock rod 15 slides in the guide hole 14 of the arm 13 in the axial direction corresponding to the operation, and By being configured so as to contact it is an gist.

[0008]

According to the above construction, the seat back 1 can be freely reclined rearward, but when a forward load is applied to the seat back 1 , the lock rod 15 slides within a predetermined interval. Since the seat back 1 does not slide any further , the forward tilt of the seat back 1 is suppressed. That is,
When the seat back 1 operates in the reclining direction, that is, the seat lock 16 contracts, the lock rod 1
With 5 of the lower end portion 15b is free to slide in the direction of exit from the guide hole 14 of the arm 13, the lower end portion 15b of the lock rod 15 when a load is applied to the forward seat back 1
There fitted into the guide hole 14, the lower end portion 15b thereof guide hole 1
4 to support the load and prevent the seat back 1 from leaning forward.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a preferred embodiment of the present invention; In the drawings, reference numeral 1 denotes a seat back of a seat, and reference numeral 2 denotes a seat back frame for holding and fixing the left and right sides of the seat back 1 to a rear portion of the seat. A lower end portion 2a of the seat back frame 2 is fixed between the front and rear beams 3 and 4 such that the lower end portion 2a is fixed to the left and right beams so that the rear support portion 6 of the spreader 6 constituting the base frame 5 is fixed.
b, a breakover arm 7 for folding the seat back 1 forward when the seat is stored is formed at the lower end 2a in the illustrated example. The arm 7 is supported by a common shaft 8 together with the arm 7. Numeral 9 denotes a seat bottom mounted on the base frame 5, which has sleeves 10 on both sides thereof and, when a plurality of seats are formed, is positioned between the seats so as to be rotatable vertically. 1
1 is attached. Reference numeral 12 denotes a shoulder harness. The upper end belt is fixed to the upper end of one side of the seat back frame 2 via a fixing bracket (not shown), and the lower end belt is connected to the other end of the base frame 5. It is structured to be fixed to the side.

The seat back frame 2 has a lower end portion 2a substantially above the support portion 8 of the seat back frame 2 with respect to the rear support portion 6b of the spreader 6 toward the front of the base frame 5 in a side view. A bearing portion 2b protruding in a letter shape is formed. Further, an arm 13 is fixedly formed on the rear end side of the front support portion 6a of the spreader 6 which extends substantially horizontally between the front and rear beams 3 and 4 of the base frame 5. The arm 13 has a bearing 2b formed on the seat back frame 2 above the arm 13.
Guide hole 14 facing the direction Ru bored tare. Lock rod 1
5 of the upper end portion 15a with fixed rotatably with respect to the bearing portion 2b of the seat back frame 2, the locking rod 1
5 is inserted into the guide hole 14 of the arm 13 . The lower end 15b of the lock rod 15 slides in the axial direction (arrow B) in the guide hole 14 of the arm 13 in response to the rotation of the seat back frame 2 back and forth (arrow A). It is configured to do so. The arms 13 are formed as a pair of left and right arms to be fitted between the seats of a plurality of seats so as to correspond to the seat back frames 2 arranged on both sides (FIG. 4).
For the configuration on one side of the seat, a configuration on only one side according to the configuration of the seat is sufficient (see FIG. 5). The bearing 2b does not necessarily need to be formed so as to protrude toward the base frame 5; it is sufficient if a space is formed at the front edge of the lower end 2a of the seat back frame 2 so that the upper end 15a of the lock rod 15 can be pivotally mounted. Things.

The depth of the guide hole 14 of the arm 13 depends on the inclination angle when the seat back 1 is reclined,
That is, the guide hole 14 is designed appropriately by the amount of movement of the bearing portion 2b of the base frame 5, and the guide hole 14 itself is
Is formed so that the inner diameter increases in the direction in which the lower end portion 15b moves in and out. For example, when the lock rod 15 is formed of a round bar, the lock rod 15 is formed in an elliptical shape. The lock rod 15 does not necessarily have to be a round rod, but may be a square rod.

Reference numeral 16 denotes a breakover arm 7 on one side.
Is a seat lock which is connected to the lower end 7a of the base frame 5 and the other side is fixed to the base frame 5 side.
By operating a reclining button (not shown) configured on the side, the retracting button can be freely expanded and contracted to prevent rotation of the breakover arm 7 at a predetermined length.
The seat back 1 is tilted rearward at a desired angle, and the tilt position can be fixed. The reclining operation of the seat back 1 is controlled. The breakover arm 7 folds the seat back 1 on the seat bottom when the seat is stored in the stowed state. Therefore, in a seat in use, the break over arm 7 is provided at the lower end of the seat back frame 2. On the other hand, it is structured to be integrally fixed with a predetermined strength. Therefore, when the seat back 1 operates in the reclining direction, that is, in the direction in which the seat lock 16 contracts, due to the axial sliding action of the lower end portion 15b of the lock rod 15 against the arm 13, the lower end of the lock rod 15 The portion 15b freely slides in a direction to come out of the guide hole 14 of the arm 13, and when a forward load is applied to the seat back 1, the lower end portion 15b of the lock rod 15 fits into the guide hole 14, Its tip abuts against the bottom of the guide hole 14 to support the load and prevent the seat back 1 from tilting forward.

In this embodiment, the breakback arm 7 is provided at the lower end 2a of the seat back frame 2.
The lower end portion 2a of the cover member is formed so as to extend to the component of the breakover arm 7, and the seat lock 16 can be linked to the lower end portion thereof, and the breakover arm 7 itself is omitted. Can also.

[0014]

[Effects of the Invention] Since the tilt lock structure for the front of the seat back according to the present invention is configured as described above, even in a passenger seat equipped with a shoulder harness, the seat back can be easily applied by the load applied from the shoulder harness. The passenger seat that is currently in use without being pivoted forward, improving passenger safety, and without making any special design changes to the base frame that constitutes the seat. Also, the effect obtained by implementing the present invention is extremely large, for example, by simply adding simple parts such as the above-mentioned arms and lock rods, it becomes possible to equip the shoulder harness and prevent the price from rising.

[Brief description of the drawings]

FIG. 1 is a perspective view of a passenger seat equipped with a shoulder harness according to the present invention.

FIG. 2 is a front view showing a seat back frame erected on a base frame.

FIG. 3 is a side view of a spreader portion showing the tilt lock structure according to the present invention.

FIG. 4 is an enlarged front view of a main part showing a structure of an arm formed between seats.

FIG. 5 is an enlarged front view of a main part showing a structure of an arm similarly formed on a side portion of the seat.

[Description of Signs] 1 Seat back 2 Seat back frame 2a Lower end of seat back frame 2b Bearing of seat back frame 3 Front beam 4 Rear beam 5 Base frame 6 Spreader 6a Front support of spreader 6b Rear support of spreader Reference Signs List 7 breakover arm 12 shoulder harness 13 arm 14 guide hole 15 lock rod 15a upper end of lock rod 15b lower end of lock rod 16 seat lock

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B64D 11/06 A47C 1/024 B60N 2/42 B61D 33/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of right and left spreaders 6 each having a front support portion 6a extending substantially horizontally between the front and rear beams 3 and 4, and a rear support portion 6b projecting obliquely above a rear portion of the front support portion 6a. And the rear support portion 6 of the spreader 6
b, the lower end 2a of the seat back frame 2 is rotatably supported on the base frame 5; While forming the bearing portion 2b of the seat back frame 2,
An arm 13 is fixedly provided at the rear end of the front support portion 6a of the spreader 6, and a guide hole 14 formed in the upper part of the arm 13 is formed in the seatback frame 2 so as to face the bearing 2b. The part 15a to the seat back frame 2
The lower end 15b of the lock rod 15 is inserted into the guide hole 14 of the arm 13 so as to be rotatable with respect to the bearing 2b, and the lower end of the lock rod 15 corresponding to the reclining operation of the seat back frame 2. The portion 15b is the guide hole 1 of the arm 13.
A tilt lock structure for the front of the seat back, characterized in that it is configured to slide in the axial direction in 4 and abut against the bottom of the guide hole 14.