JPH0672392A - Leg structure of seat absorbing impact energy - Google Patents

Abstract

PURPOSE:To nullify the mechanical energy associate with an impact load by shearing and/or spreading the end faces of rear legs displaced relatively, which is achieved only through a configuration in which a spacer is installed in the bottom part of the rear leg and a spacer is fixed to the inner surface of the rear leg with a movable shaft. CONSTITUTION:A spacer 14 is interiorly fitted where a supporting hole is provided at the bottom of each rear leg 7, a deformation hole 13 is opened above this hole, and an upper long hole 16 with at least over-part overlapped with the deformation hole 13 is provided in the cavity at the bottom of the rear leg 7. The under-part of this spacer 14 is secured to a fitting adapter by a fixing shaft 10 together with the bottom of the rear leg 7, and the long hole 16 and deformation hole 13 are laid one over another and secured by a movable shaft 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology of absorbing impact energy applied to a seat, and in particular, absorbs an impact load applied to the front side or the top side of the seat in the event of an accident such as a vehicle or an aircraft to ensure passenger safety. The present invention relates to a leg structure of a seat that absorbs the impact energy that occurs.

[0002]

2. Description of the Related Art Conventionally, various types of seat cushioning devices have been used, and generally, most of the impact energy generated when an aircraft fails to land, for example, is configured on the aircraft side. The shock absorber absorbs the impact energy when the vehicle collides with the shock absorber provided between the bumper and the chassis. However, in the case of a landing failure accident of an aircraft or a collision accident of a car, a shock load exceeding the shock absorbing capacity of the shock absorber is generated, and excessive shock energy is added to passengers. There is used a seat in which a special impact absorbing device is additionally configured on a leg structure portion such as a leg portion or a diagonal member, and the impact energy is absorbed by a crushing load or a pulling load of the impact absorbing device.

[0003]

However, the above-described conventional shock absorbing device cannot always sufficiently absorb the shock energy, and particularly in the case of an aircraft seat, the shock absorbing device is fixed to the floor surface when a shock occurs. The legs, especially the fitting components of the rear legs, may be difficult to mount on the aircraft because an excessive load is constantly applied. In addition, the rear legs themselves are structured to absorb impact energy. There wasn't. In addition, the special structure of the leg structure for shock absorbing parts and devices not only complicates the leg structure, but also increases the weight of the seat, which causes a price increase. Was there.

The present invention was devised in view of the above problems, and has a simple shock absorbing structure which is separate from the conventional shock absorbing device or is added to the conventional shock absorbing device and is formed on the rear leg of the seat itself. It is an object of the present invention to propose a leg structure of a seat which can reduce the number of parts by constructing a mechanism and can absorb impact energy which has a simple structure and can be easily processed.

[0005]

In order to achieve the above object, a leg structure of a seat for absorbing impact energy according to the present invention has a groove cross-sectional shape which is fixed to a floor surface of an aircraft and fixed to the floor surface of the aircraft. In a leg structure of a seat, a fitting adapter configured to be slidable in the floor rail direction is attached to a floor side rail, and a lower end part of the rear leg is fixed to the fitting adapter. A fixing hole is formed at the lower end portion of the rear leg and a deformation hole is formed above the fixing hole, and a spacer is formed in the lower end bore of the rear leg at least on the upper side of which an upper side elongated hole that overlaps with the deformation hole is formed. The spacer is freely installed, and the lower side of the spacer is fixedly fastened together by a fixing shaft for axially fixing the lower end of the rear leg to the fitting adapter, and the long hole on the upper side of the spacer and the rear leg are It is an Abstract that it has passed through and fixed to the movable shaft Katachiana.

The support shaft and the movable shaft are configured to absorb the impact energy applied to the seat by sequentially shearing the support holes formed in the end faces of the rear legs and expanding the deformation holes.

[0007]

According to the above structure, the lower leg of the rear leg is provided with a spacer, and the upper long hole of the spacer is used as the rear leg deformation hole, and the lower long hole or circular hole is used as the rear leg support hole. Since the structure is such that the support shaft and the movable shaft pass through in a polymerized state, the lower side of the support hole of the rear leg is sheared by the fixed shaft within the range of the long diameter of the upper side long hole of the spacer, and the upper side The movable shaft locked to the upper edge of the long hole widens the long hole portion of the deformed hole of the rear leg to eliminate mechanical energy. Further, at this time, since the end surface of the rear leg on the side of the expansion of the upper-side elongated hole is bulged, it is possible to further dissipate mechanical energy. The impact energy applied to the front side and / or the upper side of the seat is absorbed by the shearing and / or expanding stress of the support hole and the deformation hole for the rear leg.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a seat leg structure for absorbing impact energy according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of an aircraft seat having a leg structure according to the present invention, in which a base frame 3 is bridged between the front and rear beams 1 and 2, and the front and rear beams 1, 2 and Seat bottom 4 on base frame 3
The seatback 5 is placed to form a seat, and the seatback 5 is tiltably supported rearward of the seat via a reclining device (not shown). In addition, the front legs 6 and the rear legs 7 supporting the front and rear beams 1 and 2 are mounted on the mounting rails b, the lower ends of which are laid on the floor surface a of the aircraft via the front fitting adapter 8 and the rear fitting adapter 9, respectively. It has a fixed structure.

The leg structure of the seat for absorbing impact energy according to the present invention, as shown in FIGS. 2 to 5, has a lower end portion of the rear leg 7 formed in the shape of a square pipe fixedly mounted on the rear fitting adapter 9. It is composed of. A support hole 11 is formed in the lower end portion of the rear leg 7 through which a fixed shaft 10 for fixing the rear leg 7 to the rear fitting adapter 9 penetrates in the left-right direction. A deformation hole 13 is formed above the support hole 11 along the same so as to penetrate the movable shaft 12 in the left-right direction. The support hole 11 is supported by the displacement of the fixed shaft 10 when a shock load (in the direction of arrow G) that moves the fixed shaft 10 to the seat, that is, the rear leg 7, is moved below the rear leg 7 relatively. The lower part (portion A) of the hole 11 is sheared, and the shearing causes a vertical stress to reduce the impact load. Further, the deformation hole 13 has a shaft hole portion 13a through which the movable shaft 12 penetrates in an unloaded state, and a long hole portion 1 having a minor axis smaller than that of the shaft hole portion 13a and extending toward the support hole 11 side.
3b is formed continuously, and when an impact load is generated on the rear leg 7, the movable shaft 12 moves to cause the elongated hole portion 1 to move.
3b is expanded and deformed (arrow B portion), and the impact load is reduced by the vertical stress in the longitudinal direction generated in the elongated hole portion 13b. This stress is applied to the material of the rear leg 7 and the long hole portion 1 as appropriate.
It is possible to change the design depending on the size of the opening diameter of 3b in the minor axis direction. The movable shaft 12 is composed of a bolt 12a and a nut 12b in the illustrated example.

Numeral 14 is a spacer installed in the lower end portion of the rear leg 7. The spacer 14 overlaps with the support hole 11 and the deformation hole 13 formed in the rear leg 7, and the fixed shaft 10 and the movable shaft 10 are respectively moved. The shaft 12 is penetrated, and an upper side elongated hole 16 and a lower side elongated hole 17 for guiding are formed to allow the rear legs 7 to move within a predetermined range along the longitudinal direction. In the illustrated example, the spacer 14 is provided on the inner surface of the rear leg 7 formed in a square pipe shape.
It is constituted by a pair of left and right plate members 14a and 14a having a structure in which they are arranged so as to overlap and overlap with the support hole 11 opened on the side and the shaft hole portion 13a of the deformation hole 13.
It has a structure in which the spacer 15 is interposed therebetween. Further, the upper long hole 16 and the lower long hole 17 for the guide are formed such that the long diameters S1 and S2 of the upper long hole 16 are larger than that of the lower long hole 17 (S1> S2). At the same time, the lower side of the spacer 14 is fixed to the rear fitting adapter 9 together with the lower end of the rear leg 7 via the lower elongated hole 17. The lower elongated hole 17 also serves as an adjusting hole for mounting and fixing the rear leg 7 and the spacer 14 to the rear fitting adapter 9, and does not necessarily have to be an elongated hole, and is appropriately formed by a circular hole. It is also possible.

The plate member 14 constituting the spacer 14
The a and 14a are made of a material having a higher material strength than the rear leg 7, and the plate members 14a and 14 of the rear leg 7 and the spacer 14 are formed.
When the fixed shaft 10 and the movable shaft 12 penetrating the a at the same time are pulled by the plate members 14a, 14a, the fixed shaft 1
The end surface of the rear leg 7 is sheared or expanded in the direction in which 0 or the movable shaft 12 is about to be displaced. At this time, since the upper long hole 15 of the spacer 14 penetrating the fixed shaft 12 has a shorter major diameter than the lower long hole 17 penetrating the movable shaft 12 (S1> S2), the rear leg 7 has When an impact load is applied, the major axis S of the upper elongated hole 16 penetrating the movable shaft 12
Within the range of 1 (until the movable shaft 12 is displaced from the lower side to the upper side in the upper side elongated hole 16 and comes into contact with the upper edge of the upper side elongated hole 16), first, the lower side of the support hole 11 of the rear leg 7 ( (See the arrow A in FIG. 4). Then, the movable shaft 12 pulled by the upper edge of the upper elongated hole 16 of the spacer 14 expands the elongated hole portion 13b of the deformed hole 13 of the rear leg 7 (see arrow B in FIG. 4). The expanding action of the deformed hole 13 follows the shearing on the support hole 11 side, or partially, the support hole 11 side.
Although it may be performed at the same time as the side shearing, in order to correspond to the magnitude of the impact load G generated on the rear leg 7, the shearing expansion action of the deformation hole 13 and the support hole 11 is partially simultaneous. Is desirable. Further, the end face of the rear leg 7 in the expanding direction is bulged and deformed in accordance with the expanding action of the elongated hole portion 13b of the deforming hole 13 (arrow C portion).

According to the leg structure of the present invention, when an impact load (arrow G) is applied to the front of the seat, the leg structure of the seat causes the lower ends of the front leg 6 and the rear leg 7 to move forward and backward to the mounting rail b. While being fixed via the side fitting adapters 8 and 9, mechanical energy is generated to rotate the rear leg 7 side upward with the lower end portion of the front leg 6 as the center of rotation, and the lower end portion of the rear leg 7 is fitted to the rear side fitting. It acts so as to be separated from the adapter 9 (direction of arrow G in FIG. 4).

FIG. 6 assumes a state in which the impact load applied to the seat has reached the 9G level, in which the fixed shaft 10 moves to the lower end of the support hole 11 of the rear leg 7 and below it (arrow A in FIG. 4). (See the section) showing the state where shearing begins. At this time, since the movable shaft 12 is in the upper long hole 16 of the spacer 14 and is allowed to be relatively displaced within the range S1 of the long diameter thereof, the movable shaft 12 penetrates the deformed hole 13 on the rear leg 7 side (shaft hole portion). Do not change 13a).

FIG. 7 shows that the impact load applied to the rear leg 7 produces a larger amount of mechanical energy, for example, 16 G on the seat.
It is assumed that the level has been reached, and following or partially at the same time as the shearing (arrow G) on the support hole 11 side of the rear leg 7, at the upper edge of the upper side long hole 16 of the spacer 14. The elongated shaft portion 13b of the deformation hole 13 of the rear leg 7 is expanded by the locked movable shaft 12, and the end surface of the rear leg is expanded (arrow C) in the expansion direction in accordance with the expansion. The mechanical energy generated by the impact load (16G) is eliminated by the shearing and expansion of the deformation hole 13 below the support hole 11 on the rear leg 7 side and the bulging action of the end surface of the rear leg 7.

In addition, 18 and 19 are colors. Particularly, the collar 18 is interposed between the sliding contact surfaces of the movable shaft 12 and the deformation hole 13, and the elongated hole portion 1 of the deformation hole 13 formed by the movable shaft 12 is inserted.
It acts so as to smoothly perform the expanding operation for 3b.

In the above embodiment, the structure for forming the impact energy absorbing mechanism in the rear leg 7 has been described.
It is also possible to configure the front leg 6 as appropriate.

[0018]

Since the leg structure of the seat for absorbing impact energy according to the present invention is constructed as described above, it is fixed with displacement of the rear leg without increasing or changing the components of the conventional leg structure. Of the rear leg end face by the shaft and the movable shaft,
The mechanical energy generated by the impact load can be absorbed and lost by the expansion or swelling action, and an efficient leg structure of the impact absorption sheet can be configured.
Since the increase in the weight of the seat can be avoided and the leg structure is almost the same as the conventional structure, the leg structure can be easily refurbished and adjusted.

[Brief description of drawings]

FIG. 1 is a side view of a seat that constitutes a leg structure of the seat for absorbing impact energy according to the present invention.

FIG. 2 is a partially enlarged side view of a rear leg that constitutes a leg structure of a seat that absorbs impact energy.

3 is a cross-sectional view taken along the line 111-111 in FIG.

FIG. 4 is a partially enlarged side view showing the structure of the rear leg.

FIG. 5 is an enlarged side view showing the structure of a spacer.

FIG. 6 is a partially enlarged side view illustrating the operation of the leg structure according to the present invention.

FIG. 7 is a partially enlarged side view which similarly illustrates the operation of the leg structure according to the present invention.

[Explanation of symbols]

 7 Rear Leg 9 Rear Fitting Adapter 10 Fixed Shaft 11 Support Hole 12 Movable Shaft 13 Deformation Hole 13a Shaft Hole 13b Long Hole 14 Spacer 16 Upper Side Long Hole 17 Lower Side Long Hole (Circular Hole)

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[Procedure amendment]

[Submission date] April 8, 1993

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Claims (2)

[Claims] 1. A fitting adapter, which is laid on the floor surface of an aircraft and has a groove cross-sectional shape with an expanded inside, is equipped with a fitting adapter configured to be slidable in the floor rail direction, and In a leg structure of a seat having a structure in which a lower end of a rear leg is fixed to a fitting adapter, a supporting hole and a deformation hole located above the supporting hole are formed in the lower end of the rear leg, and the lower end of the rear leg is formed. A spacer formed by forming an upper elongated hole at least on the upper side that overlaps the deformation hole on the rear leg side is slidably installed in the internal cavity of the part, and the lower side of the spacer is attached to the fitting adapter of the rear leg. A leg of a seat for absorbing impact energy, characterized in that the lower end is fixed together by a fixed shaft for axially fixing, and the movable shaft is fixed through the elongated hole on the upper side of the spacer and the deformation hole of the rear leg. Elephants. 2. The seat for absorbing impact energy according to claim 1, wherein the fixed shaft and the movable shaft are configured to sequentially shear or expand the end surfaces of the rear legs to absorb impact energy applied to the seat. Leg structure.