Impact absorption device

Abstract

To provide an impact absorption device that can be reused by reverting a holder after use, and that is less likely to generate a repulsive force because impact is absorbed by a friction force generated at the time of press fitting of a columnar member.SOLUTION: An impact absorption device includes: a plate-shaped holder 3 which is detachably assembled to a frame body 2; and a columnar member 4 provided on the holder 3. The holder 3 has a through hole 3a open thereon. Both of one face and the other face of the holder 3 can be assembled to the frame body 2. With one end part 41 side of the columnar member 4 being disposed in the through hole 3a and the other end part 42 side of the columnar member 4 extending to an opposite side of the frame body 2, when an external force toward the one end part 41 side is applied to the other end part 42 side of the columnar member 4, the one end part 41 of the columnar member 4 is displaced toward the side of the frame body 2 and a middle part of the columnar member 4 is press-fitted into the through hole 3a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an impact absorbing device for absorbing an impact applied to an object to be protected. [Background technology]

[0002] BACKGROUND ART Conventionally, there has been proposed an impact absorbing device that is disposed in the vicinity of an object to be protected, such as luggage, in order to absorb impacts applied to the object (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-4432 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 describes a technology for absorbing shock using a shock-cushioning structure that includes a shock receiver and a support member with a press-fit hole into which the shock receiver can be press-fitted. This configuration has the problem that it is difficult to reuse a shock-cushioning structure that has received a shock. Therefore, the present disclosure aims to solve the above-mentioned problem. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems, the present invention provides the following impact absorbing device.

[0006] (1) A device comprising a frame body, a plate-shaped holder detachably attached to the frame body, and at least one columnar member provided on the holder, wherein the holder has at least one through-hole, and both one surface and the other surface of the holder can be attached to the frame body, and when one end of the columnar member is inserted into the through-hole and the other end of the columnar member extends to the opposite side of the frame body, an external force is applied to the other end of the columnar member toward the one end. an impact absorbing device in which, when an external force is applied to the one end of the columnar member toward the other end, while the one end of the columnar member is displaced toward the frame body and the middle portion of the columnar member is pressed into the through hole, the other end of the columnar member is inserted into the through hole and the one end of the columnar member extends to the opposite side of the frame body, the other end of the columnar member is displaced toward the frame body and the middle portion of the columnar member is pressed into the through hole.

[0007] (2) The impact absorbing device according to (1), wherein the length of the columnar member is smaller than the sum of the thicknesses of the holder and the frame body in the displacement direction of the columnar member.

[0008] (3) The columnar member is formed so that the cross-sectional shape is uniform from one end side to the other end side, and the columnar member is arranged with the one end side or the other end side pressed into the through hole. This is an impact absorbing device described in (1).

[0009] (4) The impact absorbing device according to (3), wherein the through hole is circular and the columnar member is a cylindrical member.

[0010] (5) The impact absorbing device according to (4), wherein at least one of the inner peripheral surface of the through hole and the outer peripheral surface of the columnar member is coated with polyurethane.

[0011] (6) The impact absorbing device according to (5), wherein the holder is formed of foamed resin.

[0012] (7) The impact absorbing device according to any one of (1) to (6), wherein a plate-shaped member is provided on the opposite side of the columnar member from the holder. [Effects of the Invention]

[0013] The impact absorbing device of the present invention can be reused by inverting the holder after use, and has the advantage that it is less likely to generate a repulsive force because the impact is absorbed by the frictional force generated when the columnar member is pressed into place. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view showing a state in which the impact absorbing device according to the present embodiment is in use. [Figure 2] FIG. 2 is a front view showing the state after use of the impact absorbing device according to the embodiment. [Figure 3] FIG. 2 is an exploded perspective view showing the configuration of the impact absorbing device. [Figure 4] 1(a) to 1(c) are enlarged cross-sectional views showing the impact absorbing device in use. DETAILED DESCRIPTION OF THE INVENTION

[0015] The configuration of an impact absorbing device 1 according to one embodiment of the present invention will be described using Figures 1 to 4. As shown in Figure 1, the impact absorbing device 1 according to this embodiment is used to absorb the impact that a load L receives from the ground when the load L is dropped from the air to the ground using a parachute P. Note that the use of the impact absorbing device 1 is not limited to this embodiment, and the impact absorbing device 1 can also be used, for example, to absorb the impact when a vehicle crashes or when a building receives an external impact.

[0016] As shown in Figure 1, the impact absorbing device 1 according to this embodiment is interposed between a support plate B connected to a parachute P via a wire W and a load L, which is an object to be protected, placed above the support plate B. In other words, the impact absorbing device 1 is placed on the upper surface of the support plate B, and the load L is further placed on the upper surface of that. A fixing string R is wound around the support plate B, the impact absorbing device 1, and the load L so that they do not separate from one another.

[0017] 3 and 4, the impact absorbing device 1 is configured to include a frame 2, a holder 3, a number of (25 in this embodiment) pillar-like members 4, and a plate-like member 5. The holder 3 is formed into a plate shape made of foamed resin and is detachably attached to the frame 2. The plate-like member 5 is disposed on the upper surfaces of the pillar-like members 4 provided on the holder 3. The number of pillar-like members 4 provided on the holder 3 is not limited to that in this embodiment, and may be one or any other number of pillar-like members.

[0018] As shown in Figure 3, the holder 3 has through holes 3a corresponding to the columnar members 4. As shown in Figures 4(a) and 4(c), the holder 3 can be assembled to the frame 2 with both the first surface 31 and the second surface 32 facing downward. In other words, the holder 3 can be assembled to the frame 2 with either the first surface 31 or the second surface 32 facing downward.

[0019] Furthermore, inserted portions 2a, which are recesses, are formed in the frame body 2 at locations facing the through holes 3a... In this embodiment, the holder 3 is assembled to the frame body 2 while being placed on the frame body 2, but it is also possible to configure the frame body 2 and the holder 3 so that they are positioned relative to each other by forming recesses and protrusions between them, or to configure the frame body 2 and the holder 3 so that they are connected to each other by connecting members such as pin members inserted into each.

[0020] The columnar member 4 according to this embodiment has a coating layer 4b made of polyurethane formed on the outer surface of an aluminum tubular body 4a (see FIG. 3). The outer diameter of the columnar member 4 is formed to be several mm larger than the inner diameter of the through-hole 3a. In this embodiment, the columnar member 4 has a tubular body 4a with a diameter of 80 mm, on which a coating layer 4b is formed to a thickness of 1 mm, and the inner diameter of the through-hole 3a is formed to be 70 mm.

[0021] When using the impact absorbing device 1 according to this embodiment, as shown in Figures 1 and 4(a), the second surface 32 of the holder 3 is assembled to the frame 2, and the impact absorbing device 1 is placed on the top surface of the support plate B with one end 41 (the lower end in Figure 4(a)) of the columnar member 4 inserted into the through-hole 3a and the other end 42 of the columnar member 4 extending to the opposite side (upper side) of the frame 2. Then, plate-like members 5 are placed on the top surfaces of the many columnar members 4, and luggage L is placed on top of those. A fixing string R is wound around the support plate B, the impact absorbing device 1, and the luggage L so that they do not separate from one another. A parachute P is connected to the support plate B via a wire W.

[0022] In the above configuration, when the cargo L, the shock absorbing device 1, and the support plate B are dropped from the air to the ground and collide with the ground, the weight of the cargo L applies an external force to the other end 42 (upper end) of the columnar member 4 toward the one end 41. Then, as shown in Fig. 4(b), the one end 41 of the columnar member 4 is displaced toward the frame 2 and inserted into the inserted portion 2a, and the middle part of the columnar member 4 is press-fitted into the through-hole 3a, and the other end 42 of the columnar member 4 is inserted into the through-hole 3a.

[0023] As described above, when the columnar member 4 is press-fitted into the through-hole 3a, frictional force is generated between the columnar member 4 and the through-hole 3a, and the kinetic energy due to the impact is converted into frictional heat between the columnar member 4 and the through-hole 3a. In other words, by press-fitting the columnar member 4 into the through-hole 3a, the impact applied to the shock absorbing device 1 from the load L can be absorbed.

[0024] The impact absorbing device 1 according to this embodiment can be reused even after it has been used once. Specifically, as shown in Fig. 4(c), the attitude of the holder 3 relative to the frame body 2 is inverted upside down, and the first surface 31 is attached to the frame body 2. As a result, the other end 42 (the lower end in Fig. 4(c)) of the columnar member 4 is inserted into the through-hole 3a, and one end 41 of the columnar member 4 extends to the opposite side (upper side) of the frame body 2.

[0025] In this state, when an external force is applied to one end 41 of the columnar member 4 toward the other end 42, the other end 42 of the columnar member 4 is displaced toward the frame 2, and the middle part of the columnar member 4 is press-fitted into the through-hole 3a. This allows the shock applied to the shock absorbing device 1 to be absorbed.

[0026] As described above, the shock absorbing device 1 according to this embodiment is configured to absorb shock using the frictional force generated when the columnar members 4 are press-fitted into the through-holes 3a, making it difficult for a repulsive force to be generated. This makes it difficult for the luggage L to bounce when it hits the ground, thereby stabilizing the posture of the luggage L. Furthermore, by inverting the holder 3 after using the shock absorbing device 1, it is possible to reuse the shock absorbing device 1 any number of times.

[0027] Furthermore, in the impact absorbing device 1 according to this embodiment, as shown in FIG. 4(a), the length of the columnar member 4 is smaller than the sum of the thicknesses of the holder 3 and the frame 2 in the displacement direction (vertical direction) of the columnar member 4. As a result, as shown in FIG. 4(b), when the impact absorbing device 1 is used, the lower surface of the plate-like member 5 abuts against the upper surface of the holder 3, and the holder 3 and the frame 2 absorb the impact. In this way, the entire upper surface of the holder 3 absorbs the impact applied to the plate-like member 5, thereby preventing damage to the plate-like member 5. Furthermore, when the holder 3 is inverted as shown in FIG. 4(c), the columnar member 4 can be easily aligned without the need to insert the columnar member 4.

[0028] Furthermore, in the impact absorbing device 1 according to this embodiment, the pillar-shaped member 4 is formed so that the cross-sectional shape is uniform from one end 41 to the other end 42. The pillar-shaped member 4 is provided with one end 41 side or the other end 42 side press-fitted into the through-hole 3a. This prevents the holder 3 from being destroyed during use, making it possible to reuse the impact absorbing device 1 repeatedly.

[0029] Furthermore, in the impact absorbing device 1 according to this embodiment, the through-hole 3a formed in the holder 3 is circular, and the columnar member 4 is formed as a cylindrical member. This makes it easier to obtain an appropriate coefficient of friction and sliding characteristics (wear resistance) between the columnar member 4 and the through-hole 3a.

[0030] In the impact absorbing device 1 according to this embodiment, the outer circumferential surface of the tubular body 4a of the columnar member 4 is coated with polyurethane as a coating layer 4b. This makes it easier to obtain an appropriate coefficient of friction and sliding characteristics (wear resistance) between the columnar member 4 and the through hole 3a. Note that it is also possible to configure the inner circumferential surface of the through hole 3a to be coated with polyurethane.

[0031] Furthermore, in the impact absorbing device 1 according to this embodiment, the holder 3 is made of foamed resin. This makes it easier to obtain an appropriate coefficient of friction and sliding characteristics (wear resistance) between the pillar-shaped member 4. Furthermore, in the impact absorbing device 1 according to this embodiment, a plate-shaped member 5 is provided on the pillar-shaped member 4 on the side opposite the holder 3. This allows the luggage L, which is the object to be protected, to be stably placed on the upper surface of the plate-shaped member 5. It is also possible to configure the impact absorbing device 1 without using the plate-shaped member 5. It is also possible to use the impact absorbing device 1 with the frame 2 placed upward and the pillar-shaped member 4 extending downward from the holder 3.

[0032] In the impact absorbing device 1, the shape of the columnar member 4 (the shape of the inner peripheral surface of the through hole 3a) can be a cylinder, a square prism, a triangular prism, or the like. It is also possible to use a spherical, cubic, or other shape instead of the columnar member 4. From the viewpoint of increasing the sliding distance with the through hole 3a and facilitating shock absorption, a columnar shape extending in the sliding direction is most suitable for the shape of the columnar member 4, and a cylinder is most suitable because it is less likely to concentrate stress on the sliding surface.

[0033] When the columnar member 4 is cylindrical, its outer diameter is preferably 50 mm to 200 mm, as this provides an appropriate amount of energy absorption. Furthermore, the height (length) of the columnar member 4 in the sliding direction is preferably 100 mm to 300 mm, as this provides good balance when loading the dropped object. The height of the columnar member 4 in the sliding direction is preferably smaller than the sum of the thicknesses of the holder 3 and the frame 2, as this makes it easier to prevent damage to the plate-like member 5 when the impact absorbing device 1 is in use.

[0034] The tube 4a of the columnar member 4 can be made of metal, resin, ceramic, wood, etc. Among these, aluminum is most suitable because of its light weight, high durability, and appropriate rigidity. Furthermore, polyurea, polyurethane, rubber, etc. can be used for the coating layer of the columnar member 4. Among these, polyurea is most suitable because of its appropriate balance of friction coefficient, sliding characteristics (wear resistance), weather resistance, and mechanical properties.

[0035] The columnar member 4 can be fixed to the holder 3 by friction with the sliding surface, by fitting, by adhesive, or other methods. Of these, frictional fixation is the most suitable because it does not damage the member after release and allows for easy repeated reuse. This frictional fixation is preferably adjusted to a level of holding force that prevents the sliding part from moving until it is subjected to a drop impact.

[0036] The sliding surface between the columnar member 4 and the holder 3 may be formed in the through-hole 3a formed in the holder 3, or may be formed in a separate member provided on the holder 3. It may also be formed on the outer end of the holder 3. When formed on the outer end of the holder 3, the columnar member 4 may be formed in a frame shape that surrounds the holder 3.

[0037] The holder 3 may be in any shape, including a rectangular, circular, oval, or other plate-like shape. A plate shape is most suitable because it allows for a large loading area. Materials that can be used for the frame 2 and holder 3 include foamed resin (polypropylene, polyethylene, polyurethane), soft rubber, resin, metal, ceramic, wood, paper, etc. Of these, foamed resin is preferable because it is easy to obtain an appropriate coefficient of friction.

[0038] The height of the frame 2 is desirably greater than the length of the columnar members 4 so that the columnar members 4 can make their full stroke (the entire length of the columnar members 4 can be accommodated inside the holder 3 and frame 2 when the impact absorbing device 1 is in use). The plate-like members 5 may be any shape, such as square, circular, or oval. A square plate is most suitable because it allows for a large loading area. Materials that can be used for the plate-like members 5 include wood, resins such as polypropylene and polyethylene, metals such as stainless steel and aluminum, and ceramics. Of these, wood is most suitable because it is easy to process to size. [Explanation of symbols]

[0039] 1 Impact absorbing device 2 Frame 2a Inserted part 3 Holder 3a Through hole 4 Columnar member 4a Tube body 4b Coating layer 5 Plate-shaped members 31 First page 32 Second page 41 One end 42 Other end P Parachute W Wire L Luggage B Support plate R fixed string

Claims

1. The device comprises a frame body, a plate-shaped holder detachably attached to the frame body, and at least one columnar member provided on the holder, The holder has at least one through hole formed therein, The holder is configured so that both one surface and the other surface can be assembled to the frame body, When an external force is applied to the other end of the columnar member in a direction toward the one end while one end of the columnar member is inserted into the through hole and the other end of the columnar member is extended to the opposite side of the frame body, the one end of the columnar member is displaced toward the frame body, and a midpoint of the columnar member is press-fitted into the through hole, An impact absorbing device in which, when the other end of the columnar member is inserted into the through hole and the one end of the columnar member extends to the opposite side of the frame body, and an external force is applied to the one end of the columnar member toward the other end, the other end of the columnar member is displaced toward the frame body and a middle portion of the columnar member is pressed into the through hole.

2. The impact absorbing device according to claim 1 , wherein the length of the columnar member is smaller than the sum of the thicknesses of the holder and the frame body in the displacement direction of the columnar member.

3. The columnar member is formed so that the cross-sectional shape from one end side to the other end side is uniform, The impact absorbing device according to claim 1 , wherein the columnar member is provided with the one end side or the other end side press-fitted into the through hole.

4. The impact absorbing device according to claim 3 , wherein the through-hole is circular, and the columnar member is a cylindrical member.

5. The impact absorbing device according to claim 4 , wherein at least one of an inner peripheral surface of the through hole and an outer peripheral surface of the columnar member is coated with polyurethane.

6. The impact absorbing device according to claim 5 , wherein the holder is made of foamed resin.

7. The impact absorbing device according to claim 1 , wherein a plate-like member is provided on the columnar member opposite to the holder.

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