JPH0568800U - Tilt lock structure to the front of the seat back - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the seat back from tilting forward in passenger seats equipped with shoulder harnesses. [Structure] Spreader 6 constituting base frame 5
A seat rod 2 is rotatably fixed to the rear support portion 6b, and a lock rod 15 is interposed between an arm 13 formed at the rear end of the front support portion 6a of the spreader 6, and the seat back frame 2 The lower end 15b of the lock rod 15 corresponds to the reclining operation of the
It is configured to slide in the inside in the axial direction, and the lock rod 1
When the lower end portion 15b of the seat 5 is in contact with the bottom surface of the guide hole 14, the seat back 1 is prevented from tilting forward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a passenger seat of a vehicle, a ship, an aircraft, etc., and more particularly, to a forward tilt lock structure of a seat back in a seat having a shoulder harness mounted on the seat back.

[0002]

[Prior Art]

 Conventionally, a passenger seat of a vehicle, a ship, an aircraft, etc. is provided with a reclining device for the passenger to appropriately incline the seat back to use the seat, and the passenger's safety when the seat is impacted. It is equipped with a seat belt to protect the car. Generally, a reclining device of this type has a seat back frame rotatably fixed to a rear side support portion of a spreader that constitutes a base frame, and a seat lock device is configured to cooperate with a lower end portion of the seat back frame. The structure is such that the seat lock device is expanded and contracted to recline the seat back frame.

Further, particularly in passenger seats arranged in the front row, it is desirable to equip the seat back with a so-called shoulder harness (shoulder-type seat belt) in order to improve the safety of passengers. ing. A passenger seat equipped with this kind 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]

[Problems to be solved by the device]

 By the way, although the seat lock device configured as a seat reclining device can support a large load in the compression direction, that is, in the direction in which the seat back is rotated and tilted rearward, the extension direction, that is, the seat back, is supported. The structure is such that only a small load can be supported in the direction of standing and turning forward. A seat with a breakover arm that folds the seatback forward when it is stowed, and holds the seatback frame with a predetermined strength when using it so that the seatback is erected and fixed in the used state. When a load of, for example, about 30 lbs is applied to the back, the seat back is folded forward even if the seat back frame is fixed by the seat lock device, and a large forward load cannot be supported.

Therefore, if 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 side of the seat harness. There was a problem in that the seat back was easily tilted or folded forward due to the forward load applied to the seat back, which made it meaningless to equip the seat back with a shoulder harness.

The present invention has been made in view of the above problems, and prevents forward rotation of the seat back by interposing a lock rod on the shaft support portion of the seatback frame with respect to the spreader. An object of the present invention is to provide a seat back tilt lock structure configured as described above and capable of receiving a load applied to the seat back via the shoulder harness.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a forward tilt lock structure of a seat back according to the present invention is provided with a front support part which is hung substantially horizontally between front and rear beams, and an upper part of the front support part which is tilted upward. In a base frame having a pair of left and right spreaders having protruding rear side supporting portions, and a lower end portion of a seat back frame being rotatably supported by the rear side supporting portions of the spreader, the rear side of the spreader is provided. The bearing portion is formed on the base frame side above the seat back frame shaft support portion with respect to the support portion, the arm is fixed to the rear end of the front side support portion of the spreader, and the seat back frame is formed above the arm. A lock rod having a guide hole facing in the direction of the bearing portion, the upper end side of which is fixed rotatably to the bearing portion of the seat back frame in the guide hole. Fitted to the lower end, in response to reclining movement of the seat back frame in which the subject matter that has been configured to so that to slide in the axial direction in the guide hole of the lower end support arms of the lock rod.

[0008]

[Action]

 Thus, according to the above configuration, when the seat back operates in the reclining direction, that is, in the direction in which the seat lock contracts, the lower end portion of the lock rod freely slides in the direction in which it is removed from the inner hole of the support arm. In addition, when a forward load is applied to the seat back, the lower end of the lock rod fits into the guide hole, and the tip of the lock bar contacts the bottom of the guide hole to support the load, and the seat back tilts forward. Prevent.

[0009]

【Example】

 A preferred embodiment of a forward tilt lock structure for a seat back according to the present invention will be described below with reference to the drawings. In the drawings, 1 is a seat back of a seat, and 2 is a seat back frame for sandwiching the left and right sides of the seat back 1 and supporting and fixing the seat back at the rear part of the seat. The lower end portion 2a of the seat back frame 2 is fixed to the front and rear beams 3 and 4 in a left-right pair so as to be fixed to the rear side support portion 6b of the spreader 6 that constitutes the base frame 5, and is rotated in the front-rear direction. In the illustrated example, a breakover arm 7 for folding the seatback 1 forward when the seat is stowed is provided at the lower end 2a of the shaft, and the breakover arm 7 and the breakover arm 7 serve as a shaft. It has a supporting structure. Reference numeral 9 denotes a seat bottom mounted on the base frame 5, and a sleeve 10 is formed on both sides of the seat bottom. When a plurality of seats are formed, a middle armrest that is located between the seats and is vertically rotatable. 11 is attached. Reference numeral 12 denotes a shoulder harness, which fixes the upper end side belt to one upper end portion of the seat back frame 2 via a fixing metal fitting (not shown), and the lower end side belt of the other side of the base frame 5. The structure is fixed to the side.

The seatback frame 2 has a lower end portion 2a which is substantially above the shaft support portion 8 of the seatback frame 2 with respect to the rear side support portion 6b of the spreader 6 and which is substantially forward of the base frame 5 in a side view. The bearing portion 2b is formed so as to project in a letter shape. Further, an arm 13 is fixedly formed on the rear end side of the front side 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. A guide hole 14 is formed in the upper portion of the arm 13 so as to face the bearing portion 2b formed in the seat back frame 2, and an upper end side 15a is provided in the guide hole 14. The lower end portion 15b of the rock rod 15 rotatably fixed to the bearing portion 2b of FIG. The lower end portion 15b of the lock rod 15 corresponds to the axial direction (arrow B) in the guide hole 14 of the arm 13 when the seatback frame 2 rotates back and forth (arrow A). It is configured to slide. Further, the arms 13 are formed as a pair of left and right so as to correspond to the seat back frames 2 arranged on both sides in a case where the arms are mounted between seats (see FIG. 4). For the one side structure of the seat, only the one side structure is sufficient according to the position of the seat structure (see Fig. 5). The bearing portion 2b does not necessarily have to be formed so as to project toward the base frame 5 side, and a space is formed at the front edge of the lower end portion 2a of the seatback frame 2 so that the upper end portion 15a of the lock rod 15 can be pivotally attached. It is enough.

The depth of the guide hole 14 of the arm 13 is appropriately designed according to the inclination angle when the seatback 1 is reclined, that is, the movement amount (arrow C) of the bearing portion 2b of the base frame 5. At the same time, the guide hole 14 itself is formed so that the inner diameter becomes large in the direction in which the lower end portion 15b of the lock rod 15 is inserted and removed. For example, when the lock rod 15 is formed of a round bar, it is formed in an elliptical shape. .. The lock rod 15 does not necessarily have to be a round bar but may be a square bar.

Reference numeral 16 denotes a seat lock having one side connected to the lower end portion 7 a of the breakover arm 7 and the other side fixed to the base frame 5 side. For example, a reclining button formed on the sleeve 10 side (see FIG. (Not shown) is freely expanded and contracted to prevent the breakover arm 7 from rotating for a predetermined length. The seatback 1 is tilted backward at a desired angle and the tilted position is fixed. It is possible to control the reclining operation of the seat back 1. The breakover arm 7 is for folding the seat back 1 on the seat bottom when the seat is stored in the stored state. Therefore, in the seat in the used state, the breakover arm 7 is provided at the lower end portion of the seat back frame 2. On the other hand, it has a structure in which it is integrally fixed with a predetermined strength. Therefore, when the seat back 1 moves in the reclining direction, that is, in the direction in which the seat lock 16 contracts by the sliding action of the lower end portion 15b of the lock rod 15 with respect to the arm 13 in the axial direction, the lock rod 15 of the lock rod 15 moves. The lower end portion 15b slides freely in the direction of coming 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 is fitted into the guide hole 14. The tip of the seat back 1 abuts against the bottom of the guide hole 14 to support the load and prevent the seat back 1 from tilting forward.

In the present embodiment, the breakover arm 7 is formed at the lower end 2a of the seatback frame 2, but the lower end 2a of the seatback frame 2 is formed as the breakover arm 7. It can be configured to extend to the portion, and the seat lock 16 can be linked to the lower end portion thereof, and the breakover arm 7 itself can be omitted.

[0014]

[Effect of the device]

 Since the forward tilt lock structure 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 rotated forward by the load applied from the shoulder harness. The passenger seats that are currently in use can be improved without any special design changes to the base frame that composes the seats. By adding simple parts such as arms and lock rods, it is possible to equip a holder harness and prevent price increases. The effects of implementing the present invention are extremely large.

[Brief description of 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 a tilt lock structure according to the present invention.

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

FIG. 5 is an enlarged front view of an essential part showing the structure of an arm that is also formed on the side of the seat.

[Explanation of symbols]

 1 seat back 2 seat back frame 2a lower end of seat back frame 2b seat bearing part of seat back frame 3 front beam 4 rear beam 5 base frame 6 spreader 6a spreader front support part 6b spreader rear support part 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

Claims (1)

[Scope of utility model registration request] 1. A spreader comprising a pair of left and right spreaders having a front support part which extends substantially horizontally between the front and rear beams and a rear support part which is inclined and protrudes upward from the rear part of the front support part. In a base frame having a structure in which a lower end portion of a seat back frame is rotatably supported by a rear support portion, a bearing portion is formed on a base frame side above a seat back frame shaft support portion with respect to the rear support portion of the spreader. At the same time, an arm is fixedly provided at the rear end of the front side support portion of the spreader, and a guide hole facing the bearing portion formed in the seat back frame is formed at an upper portion of the arm, and an upper end side is provided in the guide hole. The lower end of the lock rod rotatably fixed to the bearing portion of the seat back frame is fitted into the seat back frame. Tsu inclined locking structure of the lower end portion of the click rod are forward of the seat back, characterized by being configured to slide axially within the guide hole of the support arm.