JPH0571419B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a cushioning technology for a seat for a vehicle such as an aircraft or a vehicle, and in particular to an impact energy absorption technology for absorbing the impact load that occurs during an accident of a vehicle or aircraft. This relates to the mold leg structure.

[Conventional technology]

Various types of shock absorbing devices have been used in the past for chairs used in various seats of aircraft, vehicles, etc. As shown in FIG. 5, a spindle having a diameter larger than the thread diameter of the female screw 51 is attached to the inner end of a rod 52 which is inserted into the cylinder 50 and has a female screw 51 screwed into the inner diameter portion of the cylinder 50. 53 is used, and the impact load applied to the chair is absorbed by the destructive energy caused by the destructive sliding of the female screw 51 by the spindle 53.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional impact energy absorbing members, since the structure is destroyed to absorb and buffer energy, it is difficult to equalize the quality accuracy of the material and the construction accuracy of the structure.
There was a problem in that the amount of energy absorbed varied and it was difficult to ensure stable shock absorption power.

In addition, conventional impact energy absorbing members can only absorb one side of the load,
When attempting to construct a chair that absorbs impact loads from the front and back and from above and below, it is necessary to provide impact energy absorbing members in each direction, which poses the problem of complicating the structure and increasing the weight of the entire chair. Ta.

Furthermore, since it is not possible to inspect the condition of the internal parts of this type of impact energy absorbing member that has a destructive energy absorbing structure under normal usage conditions, it is necessary to disassemble it as appropriate and inspect whether it can be used. Not only does this increase maintenance costs, but it is also impossible to reuse a member that has been subjected to impact during use.

The present invention was devised in view of the above problems, has a simple structure, can stably absorb impact energy in the front and rear vertical directions without increasing the number of parts, and can easily process the parts. It is an object of the present invention to provide a shock-absorbing leg structure for a vehicle chair that is simple and easy to maintain and inspect during use.

[Means for solving problems]

The impact energy absorbing leg structure according to the present invention is used in a seat for a vehicle such as an aircraft or a vehicle, and is made of a plate spring laminate or a rod-shaped spring body having appropriate elasticity, and which undergoes a predetermined bending deformation in a direction intersecting the rod. The rear end of the spring rod consisting of the spring body is pivotally connected to the floor, the front end is pivotally connected to the front rod of the bottom frame of the chair, and the lower mid-abdominal surface of the spring rod and the front floor are supported in front. The legs are pivotally connected to each other by the leg rods, and the midsection of the spring rod rearward from the position of the part is pivotally connected to the rear rod of the bottom frame of the chair by between the rear supporting legs, and each of the pivot points The device is constructed to be rotatable.

[Effect]

Therefore, according to the above structure, the front support leg rod and the rear support leg rod of the chair are supported by one spring rod. Therefore, when there is no load, the spring rod supports the bottom frame of the seat chair at an almost horizontal predetermined angle with no deflection, but when a load is applied in the forward direction, the spring rod supports the bottom frame of the seat chair at a predetermined angle with no deflection, but when a load is applied in the forward direction, the spring rod moves backward from the upper end of the front supporting leg as the starting point. Since the lower end of the support leg rod acts to be pulled down, the spring rod curves downward and is deformed, and this bending deformation absorbs impact energy. Conversely, when a load is applied to the rear of the chair, the lower ends of the rear support leg rods are pulled down using the upper ends of the front support legs as fulcrums, causing the spring rods to curve upward and deform. absorbs impact energy.

Additionally, when a load is applied downward on the seat, the front end of the spring rod and the lower end of the rear support leg are pushed down using the upper end of the front support leg as a fulcrum, causing the spring rod to curve into an inverted S-shape. The spring rod bends and deforms, and impact energy can be absorbed by this bending deformation of the spring rod.

Furthermore, when a load is applied upward on the chair, the front end of the spring rod and the lower end of the rear support leg rod are pushed down using the connecting protrusion as a fulcrum, so the spring rod curves into an S-shape and flexes. The spring rod deforms and absorbs the impact energy by bending and deforming.

〔Example〕

Hereinafter, an embodiment of the impact energy absorbing leg structure of a chair according to the present invention will be described in accordance with a chair constituting an aircraft seat shown in FIGS. 1 and 2.

In the drawing, an arrow A points toward the front of the chair, and the impact energy absorbing structure of the chair of the present invention is such that the bottom frame 2 that supports the seat bottom 1 of the chair and the back frame 4 that supports the seat back 3 are attached to the floor. It consists of legs of the same structure on the left and right that are supported on plane a.

A connecting rod 7 extending rearward is connected to the front fitting member 5, which has an engaging protrusion 6 protruding from the lower end that engages and fixes the chair mounting rail b laid and fixed on the floor surface a of the aircraft. An engaging protrusion 8 is protruded from the lower surface of the rear end of the connecting rod 7 to form a rear fitting portion 9 that engages and secures the chair mounting rail b. 10 is rotatably attached to the rear end of the connecting rod 7 via a pin shaft 11, and the front end is rotatable via the front rod 2a of the bottom frame 2 and the mounting bracket 12. It is a spring rod that can be freely pivoted,
It is composed of a plate spring laminate or a bar-shaped spring body having appropriate elasticity, and is capable of a predetermined bending deformation in a direction perpendicular or substantially perpendicular to the rod. A pin shaft 14 is provided between the connecting projection 13 protruding from the lower surface of the midsection of the spring rod 10 and the front fitting member 5, respectively.
A front support leg rod 16 is interposed via a pin 15, and a rear support leg rod 19 is rotatably connected to a connecting protrusion 17 protruding from the upper surface of the midsection of the spring rod 10 via a pin shaft 18. At the same time, the upper end of the rear support leg rod 19 is rotatably connected to the bottom frame 2 with the rear rod 2b via a mounting fitting 20. At this time, the connecting protrusion 17 to which the rear supporting leg rod 19 is pivotally attached is provided closer to the rear end than the connecting protrusion 13 to which the front supporting leg rod 16 is pivotally attached.

The impact energy absorbing leg structure in the vehicle chair configured as described above is configured as a pair of legs on the left and right sides of the chair to support the seat bottom 1 and the seat back 3, and when there is no load, as shown in FIG. Thus, the spring rod 10 supports the bottom frame 2 of the seat chair at a substantially horizontal predetermined angle in an undeflected state. At this time, as shown in FIG. 3A, when a load is applied in the forward direction (arrow B), the connecting protrusion 12
Since the connecting protrusion 17 acts as a fulcrum to be pulled up, the spring rod 10 curves downward and is deformed, and this deformation can absorb impact energy.

On the other hand, as shown in Figure 3B, backward (arrow C)
When a load is applied to the connecting protrusion 13, the connecting protrusion 17 is pushed down using the connecting protrusion 13 as a fulcrum, causing the springing rod 10 to curve upward and deform, and this bending and deformation of the springing rod 10 absorbs impact energy. Can be absorbed.

Furthermore, as shown in FIG. 3C, when a load is applied in the downward direction (arrow D), the front end of the spring rod 10 and the connecting protrusion 17 are pushed down using the connecting protrusion 13 as a fulcrum. , the spring rod 10 is bent and deformed in an inverted S-shape, and this spring rod 10
Impact energy can be absorbed by the flexural deformation of.

Furthermore, as shown in FIG. 3D, when a load is applied from above (arrow E), the front end of the spring rod 10 and the connecting protrusion 17 are pulled up using the connecting protrusion 13 as a fulcrum. The spring rod 10 is curved and deformed in an S-shape, and impact energy can be absorbed by this bending deformation of the spring rod 10.

Figures 4A and 4B show mounting brackets 12 and 2 for rotatably connecting the front rod 2a and spring rod 10, and the rear rod 2b and rear support leg rod 19 of the bottom frame 2 of the above embodiment.
0 is provided with a shear rivet 21 and is fixed to prevent rotation within a predetermined range. It shears, and performs the same shock absorbing effect as in the case of each load shown in FIG. 3 above.

In the above embodiment, a chair constituting an aircraft seat has been described, but the same structure can be applied to a chair for other seats such as a vehicle where a chair mounting rail is not laid on the floor a.

〔Effect of the invention〕

Since the impact energy absorbing leg structure of the vehicle chair according to the present invention is constructed as described above, the front support leg rod and the rear support leg rod of the vehicle chair are positioned in the midsection of one spring rod. By adopting a structure that absorbs impact energy by bending and deforming the spring rod, the overall structure of the chair is simplified, and the impact energy in the front and rear directions is stabilized without increasing the number of parts. It has excellent features such as being able to absorb large amounts of heat and absorbing it, and the structure of each part is simple and easy to process.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a vehicle chair constituting an aircraft seat equipped with an impact energy absorbing leg structure according to the present invention, FIG. 2 is a front view of the same, and FIGS.
B, C, and D are explanatory diagrams showing the operating state when loads are applied in different directions, and FIG. 4 shows another embodiment of the present invention, A is a front view of the main part, and B is a side view of the main part. FIG. 5 is a longitudinal sectional view showing a conventional shock absorbing device. 1...Seat bottom, 2...Bottom frame,
3... Seat back, 4... Back frame, 5
...Front side fitting member, 7...Running rod, 10
...Spring rod, 16... Front support leg stick, 17... Rear support leg stick.

Claims (1)

[Claims] 1. The rear end of the spring rod, which is made of a plate spring laminate or rod-shaped spring body with appropriate elasticity and which undergoes a predetermined bending deformation in the direction crossing the rod, is pivoted to the floor surface, and the front end is It is pivotally connected to the front rod of the bottom frame of the chair, and the lower surface of the midsection of the spring rod and the front floor are pivotally connected by the front supporting leg rod, and the midsection of the spring rod behind the position A shock energy absorbing leg in a vehicle chair, characterized in that the rear rod of the bottom frame of the chair is pivotally connected between the rear support legs, and each of the pivot parts is configured to be rotatable. structure.