JPH0327040Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for reclining the backrest of an aircraft seat.

[Conventional technology]

Passenger seats installed on aircraft are equipped with backrests to prevent passengers sitting in the rear seats from inadvertently hitting their heads or bodies against the backrests of the front seats and injuring themselves in the event of an accident or other emergency. A backrest forward tilting device is incorporated, which tilts the backrest itself forward and absorbs the kinetic energy when a load of a predetermined value or more is applied to the backrest. Such backrest forward tilting devices that have been proposed in the past include rotatably attaching the lower end of the backrest frame to the seat frame, and arranging an arm below the backrest frame. A bolt for connecting the arm and the backrest frame is inserted through the groove for forward tilting formed on the lower end of the backrest frame, and the lower end of the arm is firmly fixed to the seat frame. The backrest is tilted forward within the range in which the backrest can move within the forward tilting groove,
At the same time, the friction force generated when the lower end of the backrest frame and the upper end of the arm come into contact with each other via a bearing etc. is used to reduce the load applied to the backrest from behind during the tilting movement. It is configured to obtain.

[The problem that the idea attempts to solve]

However, the forward tilting angle of the backrest, that is, the braking range, is limited by the size of the forward tilting groove, and in order to increase the forward tilting groove of the backrest, that is, the forward tilting dimension, it is necessary to The arm or backrest frame used to form the reclining groove must be made large enough to accommodate the size of the groove, and in an emergency, these metal parts could project backwards and the rear seat passenger's body could collide with it. There was a danger of doing so.

The present invention was devised in view of the above-mentioned problem. Grooves for forward tilting are provided in both the backrest frame and the arm, and the forward tilting angle of the backrest, that is, the braking range, is determined by the total length of both grooves. As well as increasing
The lower end of the backrest frame and the upper end of the arm for forming each forward tilting groove are made smaller than conventional ones, and the frictional force generated at the connection between the lower end of the backrest frame and the upper end of the arm. An object of the present invention is to provide a device for tilting forward the backrest of an aircraft seat, which generates kinetic energy in two stages and has a braking effect on kinetic energy applied to the rear part of the backrest.

[Means for Solving the Problems] In order to achieve the above object, the backrest tilting device for an aircraft seat according to the present invention includes an arm 4 in a notch 3 formed at the lower end of the backrest frame 2.
The upper end is inserted, and in the overlapping part of the two, arc-shaped forward tilting grooves 6 and 7 are bored along the circumference formed around the forward tilting rotation axis 5, respectively, and the forward tilting The gist is that bearings 8, 9, 10, 11 are interposed in sliding contact with the respective end faces in the grooves 6, 7, and these sliding contact parts are tightened and connected using a fastener 12. .

[Effect]

According to the above configuration, when the backrest frame 2 is in the normal use position, the front end of the forward tilting groove 6 on the backrest frame 2 side and the forward tilting groove 6 on the arm 4 side are connected to each other, as shown in FIG. A fastener 12 is attached to the rear end of the groove 7.
The tilting rotation to the rear is restrained with the intervening state. When a load of a predetermined value or more is applied to the backrest from behind, the backrest tilts and rotates forward. At this time, the friction force on each sliding surface of the backrest frame 2 and arm 4 and the bearings 8, 9, 10, 11 is generated uniformly on each surface, and due to the difference in the number of sliding surfaces, First, the backrest frame 2 is tilted and rotated together with the fastener 12 to the position shown in FIG. Frictional force at this time is generated on the sliding surfaces of the arm 4 and the bearings 9 and 10. Further, as the load continues to be applied to the backrest, the backrest frame 2 tilts and rotates to the position shown in FIG. The frictional force at this time is generated on the sliding surfaces of the backrest frame 2 and the bearings 8, 9, 10, 11, and due to the difference in the number of sliding surfaces, approximately 2
This results in twice the frictional force, which produces a braking effect against the impact force of the same load, making it possible to soften the tilting shock of the backrest.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the backrest tilting device for an aircraft seat according to the present invention will be described with reference to the drawings.

In the drawings, 1 is a seat frame, and 2 is a backrest frame whose lower end is rotatably attached to the seat frame 1. This back frame 2
A notch 3 is formed in the lower end of the arm 4, into which the upper end of the arm 4 is inserted.
The lower end of the backrest frame 2 and the upper end of the arm 4 overlap each other and are formed around a backrest forward tilt rotation axis 5 that rotatably attaches the backrest frame 2 to the seat frame 1. It is provided with arc-shaped forward tilting grooves 6 and 7 along the circumference, and the lower end of the backrest frame 2 and the upper end of the arm 4 are arranged so that frictional force is generated in these tilting grooves 6 and 7, respectively. bearing 8 slidingly in contact with the end face of
9, 10, 11 are interposed, and a fastener 12 such as a bolt or nut is passed through these bearings 8, 9, 10, 11 and the tilting grooves 6, 7, and these sliding contact portions are inserted into the bearing 8. , 11 from the outside through washers 13 and 14.

The arm 4 is fixed to the seat frame 1 at its upper end by the backrest forward tilting rotation shaft 5 and at its lower end by the forward tilting device fixing shaft 15, and on the forward tilting device fixing shaft 15 side, When the backrest receives an impact load from behind and tilts forward about the backrest forward tilt rotation axis 5, the backrest frame 2 is rotated between the backrest frame 2 and the arm 4.
It is possible to tilt it within the range of the forward tilting grooves 6 and 7, and to prevent its outward rotation.

In addition, the bearings 8, 9, 10, and 11 are capable of resisting the load applied to the backrest by adjusting the tightening force of fasteners 12 such as bolts and nuts on the sliding surfaces of the backrest frame 2 and the arm 4. Braking force can be adjusted.

[Effect of idea]

Since the aircraft seat forward tilting device according to the present invention is configured as described above, the forward tilting angle of the backrest, that is, the braking range is determined by the forward tilting groove on the backrest frame side and the forward tilting groove on the arm side, respectively. Corresponding to the total forward tilting angle formed by the forward tilting groove, the safety of aircraft seats is improved by reducing the parts that should form the forward tilting groove while ensuring the necessary forward tilting angle, and The practical effects of implementing the present invention are extremely large, such as the ability to generate a frictional force in two stages during the tilting motion of the backrest to perform a braking action against the load applied to the rear part of the backrest.

[Brief explanation of drawings]

Fig. 1 is a side view of a seat comprising a backrest forward-folding device according to the present invention, Fig. 2 is an enlarged perspective view of the backrest, Fig. 3 is an enlarged front view of the same forward-folding device, and Fig. 4 is an enlarged front view of the seat. Similarly, FIGS. 5A, 5B, and 5C, which are side views, are explanatory views of the operation of the forward tilting device. 1...Seat frame, 2...Back frame,
3... Notch, 4... Arm, 5... Backrest forward tilt rotation axis, 6, 7... Front tilt groove, 8, 9, 1
0, 11...bearing, 15...forward tilting device fixing shaft.

Claims (1)

[Claim for Utility Model Registration] The upper end of the arm is inserted into the notch formed at the lower end of the backrest frame, and the circumference formed around the forward tilting rotation axis at the overlapping part of the two. At the same time, an arc-shaped forward tilting groove is bored, and a bearing is interposed in the forward tilting groove portion to slide in contact with each end face, and these sliding contact portions are tightened and connected using a fastener. Features: Aircraft seat backrest tilting device.