Shock absorbing mechanism and method for electronic device protective box

Abstract

To provide an impact absorbing mechanism of an electronic device protection box that can further reduce a risk of a failure of an electronic apparatus stored in an electronic device protection box.SOLUTION: A projection 6 protruding laterally from an electronic device protection box 2 is arranged between an upper support part 4 and a lower support part 5 provided for a mobile body 10 apart from each other in a vertical direction Z, and the projection 6 is brought into a state connected to the upper support part 4 and the lower support part 5 in a manner movable in the vertical direction. When an impact is applied to the mobile body 10, the impact acted on the electronic device protection box 2 is absorbed by contraction and restoration of an upper spring member 8 arranged between the upper support part 4 and the projection 6 and extending in the vertical direction Z and a lower spring member 9 arranged between the projection 6 and the lower support part 5 and extending in the vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an impact absorbing mechanism and an impact absorbing method for an electronic device protective case, and more particularly to an impact absorbing mechanism and an impact absorbing method for an electronic device protective case that can further reduce the risk of failure of an electronic device stored in the electronic device protective case. [Background technology]

[0002] Mobile objects such as cranes and vehicles are provided with electronic device protective boxes (electrical device boxes) that house multiple electronic devices (see, for example, Patent Document 1). Conventionally, the electronic device protective box is directly fixed to the frame of a structure that constitutes the mobile object. Therefore, when an impact is applied to the structure to which the electronic device protective box is fixed, the impact is easily transmitted from the structure to the electronic device protective box, and the electronic devices stored in the electronic device protective box may be damaged.

[0003] In particular, in an electronic device protection box installed on a spreader (loading equipment) of a crane that handles containers, when the spreader lands on the container, a large impact is applied to the spreader in the vertical direction, and the large impact is transmitted to the electronic device protection box. Therefore, there is a relatively high risk of the electronic devices stored in the electronic device protection box being damaged, and there is room for improvement in protecting the electronic devices stored in the electronic device protection box. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 61-222297 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide an impact absorbing mechanism and an impact absorbing method for an electronic device protective case that can further reduce the risk of damage to an electronic device stored in the electronic device protective case. [Means for solving the problem]

[0006] In order to achieve the above object, the shock absorbing mechanism for an electronic device protective case of the present invention includes an upper support portion and a lower support portion provided on a moving body spaced apart from each other in the vertical direction, a protruding portion that protrudes to the side of the electronic device protective case and is disposed between the upper support portion and the lower support portion, a guide mechanism that connects the protruding portion to the upper support portion and the lower support portion so as to be vertically movable, an upper spring member that is disposed between the upper support portion and the protruding portion and extends in the vertical direction, and a lower spring member that is disposed between the protruding portion and the lower support portion and extends in the vertical direction. The spring constant of the lower spring member is greater than the spring constant of the upper spring member. It is characterized by: Another shock absorbing mechanism for an electronic device protective case of the present invention comprises an upper support portion and a lower support portion provided on a movable body and spaced apart from each other in the vertical direction, a protrusion protruding to the side of the electronic device protective case and arranged between the upper support portion and the lower support portion, a guide mechanism connecting the protrusion to the upper support portion and the lower support portion so that the protrusion can move up and down, an upper spring member arranged extending in the vertical direction between the upper support portion and the protrusion, and a lower spring member arranged extending in the vertical direction between the protrusion and the lower support portion, wherein the upper spring member and the lower spring member are each composed of a compression coil spring. A further shock absorbing mechanism for an electronic device protective case of the present invention includes an upper support section and a lower support section provided on a moving body and spaced apart from each other in the vertical direction, a protruding section that protrudes to the side of the electronic device protective case and is disposed between the upper support section and the lower support section, a guide mechanism that connects the protruding section to the upper support section and the lower support section so as to be vertically movable, an upper spring member that is disposed between the upper support section and the protruding section and extends in the vertical direction, and a lower spring member that is disposed between the protruding section and the lower support section and extends in the vertical direction, The present invention is characterized in that, when the protrusion and the electronic device protective box move above a standard installation position, which is a relative height position to the lower support part at which the protrusion is located under normal circumstances when no impact is applied to the moving body, the upper spring member contracts, thereby applying a downward biasing force to the protrusion, and, when the protrusion and the electronic device protective box move below the standard installation position under normal circumstances and when the protrusion and the electronic device protective box move below the standard installation position, the upper spring member assumes its natural length and does not apply a biasing force to the protrusion.

[0007] In order to achieve the above object, the present invention provides a method for absorbing shock for an electronic device protective case, comprising: arranging a protruding portion that protrudes to the side of the electronic device protective case between an upper support portion and a lower support portion that are provided on a moving body and spaced apart from each other in the vertical direction; connecting the protruding portion to the upper support portion and the lower support portion so as to be vertically movable; and, when a shock is applied to the moving body, absorbing the shock acting on the electronic device protective case by contracting and restoring an upper spring member that is arranged to extend in the vertical direction between the upper support portion and the protruding portion, and a lower spring member that is arranged to extend in the vertical direction between the protruding portion and the lower support portion. In this case, the spring constant of the lower spring member is set to be greater than the spring constant of the upper spring member. Another method of absorbing impact for an electronic device protective case of the present invention includes arranging a protrusion that protrudes to the side of the electronic device protective case between an upper support portion and a lower support portion that are spaced apart from each other in the vertical direction on a moving body, and connecting the protrusion so that it can move up and down relative to the upper support portion and the lower support portion, and when an impact is applied to the moving body, an upper spring member that is arranged extending in the vertical direction between the upper support portion and the protrusion, and a lower spring member that is arranged extending in the vertical direction between the protrusion and the lower support portion contract and restore to absorb the impact acting on the electronic device protective case, wherein the upper spring member and the lower spring member are each constructed from a compression coil spring. In yet another shock absorbing method for an electronic device protective case of the present invention, a protruding portion that protrudes to the side of the electronic device protective case is disposed between an upper support portion and a lower support portion that are provided on a moving body and spaced apart from each other in the vertical direction, and the protruding portion is connected to the upper support portion and the lower support portion so as to be vertically movable, and when an impact is applied to the moving body, an upper spring member that is disposed to extend in the vertical direction between the upper support portion and the protruding portion, and a lower spring member that is disposed to extend in the vertical direction between the protruding portion and the lower support portion contract and restore, acting on the electronic device protective case. When absorbing an impact, when the protrusion and the electronic device protective case move above a standard installation position, which is a relative height position to the lower support part at which the protrusion is located under normal circumstances when no impact is applied to the moving body, the upper spring member contracts to apply a downward biasing force to the protrusion, and when the protrusion and the electronic device protective case move below the standard installation position under normal circumstances and when the protrusion and the electronic device protective case move below the standard installation position, the upper spring member reaches its natural length and does not apply a biasing force to the protrusion. Effect of the Invention

[0008] According to the present invention, even if an impact is applied to the moving body and transmitted to the upper support part or the lower support part, the impact is effectively absorbed by the contraction and restoration of the upper spring member and the lower spring member, so that the impact transmitted to the electronic device protective box can be effectively reduced. Furthermore, the upward and downward vibrations of the protrusion and the electronic device protective box relative to the upper support part and the lower support part are effectively damped by the biasing forces of the upper spring member and the lower spring member, so that the risk of failure of the electronic device stored in the electronic device protective box can be effectively reduced. [Brief description of the drawings]

[0009] [Figure 1] 1 is an explanatory diagram showing a cross-sectional view of a shock absorbing mechanism of an electronic device protective case according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a view taken along the arrow A in FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along the arrows B-B in FIG. [Figure 4] 4 is an explanatory diagram showing a schematic cross-sectional view of the shock absorbing mechanism of the electronic device protective box of FIG. 1, where FIG. 4(a) shows the electronic device protective box positioned at a standard installation position, FIG. 4(b) shows the electronic device protective box moved above the standard installation position, and FIG. 4(c) shows the electronic device protective box moved below the standard installation position. [Diagram 5] 5A and 5B are explanatory diagrams showing a schematic cross-sectional view of the shock absorbing mechanism of an electronic device protective case according to another embodiment of the present invention, in which (a) of FIG. 5 shows a state in which the electronic device protective case is positioned at a standard installation position, (b) of FIG. 5 shows a state in which the electronic device protective case has been moved above the standard installation position, and (c) of FIG. 5 shows a state in which the electronic device protective case has been moved below the standard installation position. [Figure 6] 13 is an explanatory diagram showing a cross-sectional view of a shock absorbing mechanism of an electronic device protective case according to another embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The shock absorbing mechanism of the electronic device protective case of the present invention will be described below based on the embodiment shown in the drawings. In the drawings, the X direction indicates the left-right direction X, which is any one direction in a horizontal plane, the Y direction indicates the depth direction Y perpendicular to the left-right direction X in the horizontal plane, and the Z direction indicates the up-down direction Z.

[0011] The shock absorbing mechanism 1 of the electronic device protective case 2 of the embodiment illustrated in Figures 1 to 4 is provided on a moving body 10 such as a crane or a vehicle. In this embodiment, the shock absorbing mechanism 1 of the electronic device protective case 2 is provided on a spreader 11 (loading equipment) of a crane that handles containers. The installation position of the shock absorbing mechanism 1 on the moving body 10 is not particularly limited, and for example, the shock absorbing mechanism 1 can be provided on a leg structure, boom, running gear, etc. of a crane, or inside the vehicle body, etc. of a vehicle.

[0012] 1, an electronic device protective case 2 (also called a junction box) is a box body that protects an electronic device 3 (electrical equipment) mounted on a moving body 10, and a plurality of electronic devices 3 are stored inside the electronic device protective case 2 (hereinafter referred to as the protective case 2). Each electronic device 3 is fixed to the protective case 2. In this embodiment, a rectangular parallelepiped-shaped protective case 2 is illustrated, but the shape and internal structure of the protective case 2 are not particularly limited.

[0013] In this embodiment, each electronic device 3 is fixed on a base provided inside the protective box 2. For example, the electronic device 3 can be directly fixed to the protective box 2. The protective box 2 has a through hole through which the wiring 3a (communication cable, power cable, etc.) of each electronic device 3 can be inserted. In this embodiment, the through hole through which the wiring 4a passes is provided in the bottom part and the base of the protective box 2, but for example, the through hole can also be provided in the top or side part of the protective box 2.

[0014] 1 to 3, the shock absorbing mechanism 1 includes an upper support part 4 and a lower support part 5 provided on a moving body 10 and spaced apart from each other in the up-down direction Z, a protruding part 6 protruding to the side of the protective box 2 and disposed between the upper support part 4 and the lower support part 5, and a guide mechanism 7 connecting the protruding part 6 to the upper support part 4 and the lower support part 5 so as to be movable up and down. The shock absorbing mechanism 1 further includes an upper spring member 8 disposed between the upper support part 4 and the protruding part 6 and extending in the up-down direction Z, and a lower spring member 9 disposed between the protruding part 6 and the lower support part 5 and extending in the up-down direction Z.

[0015] In this embodiment, a through hole through which the wiring 3a of the electronic device 3 can be inserted is formed in a frame constituting the spreader 11, and the protective box 2 is disposed above the through hole. A plate-like member is attached to the lower part of the protective box 2, and a portion of the plate-like member that protrudes in the left-right direction X beyond the protective box 2 constitutes a protruding portion 6. The protruding portion 6 is provided on both sides of the protective box 2 in the left-right direction X. The protruding portion 6 and the protective box 2 are integrated.

[0016] Plate-shaped lower support parts 5 are provided below the protruding parts 6 on both sides in the left-right direction X of the protective box 2. Each lower support part 5 is fixed on the spreader 11 and extends in the depth direction Y. A rod-shaped part 7a extending in the up-down direction Z constituting the guide mechanism 7 is erected on the lower support parts 5. In this embodiment, a plurality of rod-shaped parts 7a are disposed on the left and right lower support parts 5 at intervals from each other in the depth direction Y.

[0017] The protruding parts 6 on both the left and right sides have through holes 6a penetrating in the vertical direction Z at positions corresponding to the respective rod-shaped parts 7a. The rod-shaped parts 7a are inserted into the through holes 6a of the protruding parts 6, and the protruding parts 6 are configured to be movable in the vertical direction Z along the rod-shaped parts 7a. The through holes 6a of the protruding parts 6 are formed to have approximately the same dimensions as the cross section of the rod-shaped parts 7a, and the protruding parts 6 are configured to be difficult to move relative to the rod-shaped parts 7a in the horizontal direction. In this embodiment, the rod-shaped parts 7a have a round cross section, but the rod-shaped parts 7a may have a polygonal cross section or a ring-shaped cross section.

[0018] A fastener that can be detached from the rod-shaped portion 7a is attached to the upper portion of the rod-shaped portion 7a, which is located above the protrusion 6, as the upper support portion 4. In this embodiment, a thread is cut on the circumferential surface of the rod-shaped portion 7a, and a nut is screwed onto the upper portion of the rod-shaped portion 7a as the fastener that constitutes the upper support portion 4.

[0019] The upper spring member 8 and the lower spring member 9 are composed of compression coil springs. The upper spring member 8 is disposed between the upper surface of the protruding portion 6 and the lower surface of the upper support portion 4, extending in the vertical direction Z. The lower spring member 9 is disposed between the lower surface of the protruding portion 6 and the upper surface of the lower support portion 5, extending in the vertical direction Z. The upper spring member 8 and the lower spring member 9 are fitted on the outside of each rod-shaped portion 7a. In this embodiment, the lower end of the upper spring member 8 is fixed to the upper surface of the protruding portion 6, and the lower end of the lower spring member 9 is fixed to the upper surface of the lower support portion 5. The protruding portion 6 is disposed at a midpoint in the vertical direction Z between the upper support portion 4 and the lower support portion 5, separated from the upper support portion 4 and the lower support portion 5.

[0020] As shown in (a) of FIG. 4, in normal times (hereinafter referred to as normal times) when no impact is being applied to the moving body 10 (spreader 11), an upward biasing force F1 is applied to the protruding portion 6 by the lower spring member 9, and the load of the protruding portion 6 and the protective box 2 (including the electronic device 3) is supported by the lower spring member 9. In normal times, the upper spring member 8 is at its natural length, and no biasing force is applied from the upper spring member 8 to the protective box 2. In the following, the height position relative to the lower support portion 5 where the protruding portion 6 is located in normal times is referred to as the reference installation position LR. In the figure, the reference installation position LR is indicated by a dashed line.

[0021] When an impact is applied to the movable body 10 and the impact is transmitted to the lower support part 5 and the upper support part 4, most of the impact is absorbed by the upper spring member 8 and the lower spring member 9 functioning as shock absorbers. However, when the movable body 10 to which an impact is applied vibrates relatively violently in the vertical direction Z, the protrusion 6 and the protective box 2 may move up and down by a relatively small amount relative to the upper support part 4 and the lower support part 5. In such a case, as exemplified in (b) and (c) of FIG. 4, the protective box 2 moves slightly upward or downward with respect to the standard installation position LR.

[0022] 4(b), when the protrusion 6 and the protective box 2 move above the reference installation position LR, the upper spring member 8 contracts and applies a downward biasing force F2 to the protrusion 6. The lower spring member 9 expands and applies an upward biasing force F3 to the protrusion 6 that is smaller than the biasing force F1 when the protrusion 6 was located at the reference installation position LR, or applies no biasing force to the protrusion 6 when the lower spring member 9 reaches its natural length. The upward acceleration of the protrusion 6 and the protective box 2 is attenuated by the downward biasing force F2 of the upper spring member 8, and the protrusion 6 and the protective box 2 move downward to return to the reference installation position LR.

[0023] 4(c), when the protrusion 6 and protective box 2 move downward from the standard installation position LR, the lower spring member 9 contracts, applying to the protrusion 6 an upward biasing force F4 that is greater than the biasing force F1 when the protrusion 6 and protective box 2 were located at the standard installation position LR. The upper spring member 9 reaches its natural length and applies no biasing force to the protrusion 6. The downward acceleration of the protrusion 6 and protective box 2 is attenuated by the upward biasing force F4 from the lower spring member 8, and the protrusion 6 and protective box 2 move upward to return to the standard installation position LR.

[0024] In this manner, in the shock absorbing mechanism 1, even when an impact is applied to the moving body 10 and the impact is transmitted to the upper support portion 4 or the lower support portion 5, the impact is absorbed by the contraction and restoration of the upper spring member 8 and the lower spring member 9, so that the impact transmitted to the protective box 2 can be effectively reduced. Furthermore, the vibration of the protruding portion 6 and the protective box 2 in the vertical direction Z relative to the upper support portion 4 and the lower support portion 5 is effectively damped by the biasing force of the upper spring member 8 and the lower spring member 9, so that the risk of failure of the electronic device 3 stored in the protective box 2 can be effectively reduced. Therefore, the risk of failure of the electronic device 3 stored in the protective box 2 can be further reduced compared to the conventional case where the protective box 2 is directly fixed to the structure of the moving body 10.

[0025] As in this embodiment, when the guide mechanism 7 has a rod-shaped portion 7a extending in the vertical direction Z between the upper support portion 4 and the lower support portion 5, and a through hole 6a formed in the protruding portion 6 through which the rod-shaped portion 7a is inserted, the protruding portion 6 can move vertically along the rod-shaped portion 7a. Therefore, while having a simple structure, the protruding portion 6 can be connected to the upper support portion 4 and the lower support portion 5 so as to be vertically movable, and horizontal vibration of the protruding portion 6 and the protective box 2 relative to the upper support portion 4 and the lower support portion 5 can be effectively suppressed. Therefore, it is more advantageous to reduce the risk of failure of the electronic device 3 stored in the protective box 2.

[0026] Furthermore, if a fastener that can be attached to the rod-shaped portion 7a is attached to the top of the rod-shaped portion 7a as the upper support portion 4, the upper spring member 8, the protective box 2 (protruding portion 6), and the lower spring member 9 can be easily removed from the rod-shaped portion 7a simply by removing the upper support portion 4 (fastener) from the rod-shaped portion 7a. This makes it easier to replace or maintain the upper spring member 8, the lower spring member 9, the protective box 2, and the like, and to store the electronic device 3 in the protective box 2. Also, if a configuration is adopted in which the vertical position at which the upper support portion 4 (fastener) is fixed to the rod-shaped portion 7a can be changed, for example, it becomes possible to adjust the magnitude of the urging force of the lower spring member 9 and the upper spring member 8 against the protruding portion 6 by changing the vertical position of the upper support portion 4 to change the degree of contraction of the lower spring member 9 and the upper spring member 8.

[0027] If the protrusion 6 and the protective box 2 are configured to be separable, the protective box 2 can be easily removed from the shock absorbing mechanism 1, which makes it easier to store the electronic device 3 in the protective box 2 and to replace and maintain the electronic device 3. For example, the protrusion 6 may be joined to the protective box 2 by welding or the like, or a part of a component of the protective box 2 may be used as the protrusion 6.

[0028] When the upper spring member 8 and the lower spring member 9 are configured to be fitted externally onto the rod-shaped portion 7a, horizontal distortion of the upper spring member 8 and the lower spring member 9 is suppressed by the rod-shaped portion 7a, and the upper spring member 8 and the lower spring member 9 expand and contract in the vertical direction Z in a very stable state. This is therefore advantageous for more effectively reducing the impact transmitted to the protective box 2 and the vibration of the protective box 2 in the vertical direction Z. Note that, for example, the upper spring member 8 and the lower spring member 9 can be disposed at a position separated from the guide mechanism 7 without fitting the upper spring member 8 and the lower spring member 9 externally onto the rod-shaped portion 7a.

[0029] The spring constants of the upper spring member 8 and the lower spring member 9 can be appropriately determined according to the weight of the protective box 2 in a state in which the electronic device 3 is stored and the number of the upper spring members 8 and the lower spring members 9 installed, but it is preferable to make the spring constant of the lower spring member 9 larger than that of the upper spring member 8. Since gravity acts on the protective box 2, when the protective box 2 vibrates in the vertical direction Z, the downward acceleration is relatively larger than the upward acceleration. Therefore, by making the spring constant of the lower spring member 9 larger than that of the upper spring member 8, the vibration of the protective box 2 in the vertical direction Z can be effectively damped in a shorter time by the lower spring member 9 and the upper spring member 8. Specifically, for example, it is preferable to set the spring constant of the lower spring member 9 within a range of 1.1 times to 2.0 times the spring constant of the upper spring member 8, more preferably within a range of 1.3 times to 1.7 times.

[0030] The shock absorbing mechanism 1 can also be configured as in another embodiment shown in Fig. 5. In this embodiment, the conditions under which the upper spring member 8 and the lower spring member 9 apply a biasing force to the protective box 2 are different from those in the previously described embodiment. The other configurations are the same as those in the embodiment shown in Figs. 1 to 4.

[0031] As illustrated in (a) to (c) of FIG. 5, in this embodiment, the upper spring member 8 is always in a state of applying a downward biasing force to the protective box 2, and the lower spring member 9 is always in a state of applying an upward biasing force to the protective box 2. More specifically, as illustrated in (a) of FIG. 5, in the normal state, when the protrusion 6 and the protective box 2 are located at the standard installation position LR, the upper spring member 8 is in a state of applying a downward biasing force F5 to the protrusion 6, and the lower spring member 9 is in a state of applying an upward biasing force F6 to the protrusion 6. That is, the upper spring member 8 and the lower spring member 9 are each in a state of being contracted from their natural lengths, and a state is reached in which a resultant downward force acting on the protrusion 6 due to the load of the protrusion 6 and the protective box 2 (including the electronic device 3) and the downward biasing force F5 by the upper spring member 8 and an upward biasing force F6 acting on the protrusion 6 by the lower spring member 9 are in equilibrium.

[0032] 5B, when the protrusion 6 and the protective box 2 move upward from the reference installation position LR relative to the lower support portion 5 and the upper support portion 4, the upper spring member 8 contracts more, so that the upper spring member 8 applies a larger downward biasing force F7 to the protrusion 6 than the biasing force F5 when the protrusion 6 and the protective box 2 are located at the reference installation position LR. The lower spring member 9 expands, so that the upper spring member 8 applies an upward biasing force F8 to the protrusion 6 that is smaller than the biasing force F6 when the protrusion 6 and the protective box 2 are located at the reference installation position LR. In other words, the lower spring member 9 does not have a natural length, but is always in a contracted state, so that the upper spring member 8 always applies an upward biasing force F8 to the protective box 2.

[0033] As a result, the upward acceleration of the protrusion 6 and the protective box 2 is attenuated by the downward biasing force F7 of the upper spring member 8, and the protrusion 6 and the protective box 2 move downward to return to the standard installation position LR. Furthermore, because the upward biasing force F8 of the lower spring member 9 acts on the protrusion 6, the downward acceleration when the protective box 2 moves downward toward the standard installation position LR is also attenuated.

[0034] 5(c), when the protrusion 6 and the protective box 2 move downward from the reference installation position LR, the lower spring member 9 contracts, so that the lower spring member 9 applies a larger upward biasing force F10 to the protrusion 6 than the biasing force F6 when the protrusion 6 and the protective box 2 are located at the reference installation position LR. The upper spring member 9 contracts from its natural length, so that the upper spring member 8 applies a smaller downward biasing force F9 to the protrusion 6 than the biasing force F5 when the protrusion 6 and the protective box 2 are located at the reference installation position LR. In other words, the upper spring member 8 does not have its natural length, but is constantly contracted and constantly applies a downward biasing force F9 to the protrusion 6.

[0035] As a result, the downward acceleration of the protrusion 6 and the protective box 2 is attenuated by the upward biasing force F10 of the lower spring member 9, and the protrusion 6 and the protective box 2 move upward to return to the standard installation position LR. Furthermore, the downward biasing force F9 of the upper spring member 8 acts on the protective box 2, so that the upward acceleration of the protective box 2 moving upward toward the standard installation position LR is also attenuated.

[0036] In this manner, when the upper spring member 8 constantly applies a downward biasing force to the protrusion 6 and the lower spring member 9 constantly applies an upward biasing force, the opposing biasing forces constantly applied to the protrusion 6 by the upper spring member 8 and the lower spring member 9 make it more difficult for the protective box 2 to move up and down relative to the reference installation position LR, which is more advantageous for suppressing vibration in the vertical direction Z of the protective box 2. Furthermore, even when the protective box 2 vibrates in the vertical direction Z, the acceleration when the protrusion 6 moves upward or downward toward the reference installation position LR can be more effectively damped, so that the swing back of the protective box 2 can be more effectively reduced, which is more advantageous for damping vibration of the protective box 2 in the vertical direction Z.

[0037] The shock absorbing mechanism 1 can also be configured as in another embodiment illustrated in Fig. 6. The shock absorbing mechanism 1 of this embodiment differs from the shock absorbing mechanism 1 of the previously illustrated embodiment in the configurations of the protrusion 6, the upper support portion 4, and the lower support portion 5. The other configurations are the same as those of the previously illustrated embodiment.

[0038] In this embodiment, a frame unit having an upper support part 4 and a lower support part 5 is fixed on a spreader 11. This frame unit is configured to include a lower support part 5 fixed on the spreader 11, a pillar extending upward from the lower support part 5, and an upper support part 4 fixed to the upper part of the pillar. The upper support part 4 and the lower support part 5 are each configured of a plate-like member extending horizontally. The lower support part 5 is provided with a through hole that passes in the vertical direction Z and through which the wiring 3a of the electronic device 3 can be inserted. A pillar is disposed at each of the four corners of the upper support part 4 and the lower support part 5 in a plan view.

[0039] In this embodiment, a plate-shaped protrusion 6 extending in the left-right direction X and the depth direction Y is detachably connected to a pair of side surfaces of the protective box 2 facing each other in the left-right direction X. A plurality of through holes 6a are formed in each protrusion 6 at intervals in the depth direction Y, and a rod-shaped portion 7a is inserted into each through hole 6a. The other configurations are the same as those of the embodiment exemplified above. Even when the protrusion 6, the upper support portion 4, and the lower support portion 5 are configured in this way, it is possible to achieve substantially the same effects as those of the embodiment exemplified above.

[0040] The structures, shapes, sizes, number of members, and arrangements of the upper support portion 4, the lower support portion 5, the protruding portion 6, the guide mechanism 7, the upper spring member 8, and the lower spring member 9 are not limited to those in the above-described embodiment, and may be appropriately determined according to the installation position of the shock absorbing mechanism 1 and the size and weight of the protective box 2 (including the electronic device 3). The protruding portion 6 may have any structure that protrudes to the side of the protective box 2 in a plan view, and may be provided, for example, at the upper end of the protective box 2. In addition, for example, the protruding portion 6 (through hole 6a), the guide mechanism 7 (rod-shaped portion 7a), the upper spring member 8, and the lower spring member 9 may be provided on each of the four horizontal sides (left-right direction X and depth direction Y) of the protective box 2.

[0041] Furthermore, it is sufficient that at least one of the upper support part 4 and the lower support part 5 is integrated with the movable body 10 and is disposed spaced apart from each other in the vertical direction Z, and for example, an existing structure (framework, etc.) that constitutes the movable body 10 can be used as the upper support part 4 and the lower support part 5. Furthermore, the guide mechanism 7 is not limited to the embodiment exemplified above, and can have a different structure as long as it has a structure that connects the protrusion 6 to the upper support part 4 and the lower support part 5 so as to be vertically movable. [Explanation of symbols]

[0042] 1. Shock absorbing mechanism 2 Electronic equipment protection box 3 Electronic equipment 3a wiring 4 Upper support part 5 Lower support part 6 Protrusion 6a Through hole 7 Guide mechanism 7a Rod-shaped part 8 Upper spring member 9 Lower spring member 10 Mobile 11 Spreader LR standard installation position

Claims

1. An impact absorbing mechanism for an electronic device protective case comprising: an upper support portion and a lower support portion provided on a movable body and spaced apart from each other in the vertical direction; a protrusion protruding to the side of the electronic device protective case and arranged between the upper support portion and the lower support portion; a guide mechanism connecting the protrusion to the upper support portion and the lower support portion so that the protrusion can move up and down; an upper spring member arranged extending in the vertical direction between the upper support portion and the protrusion portion; and a lower spring member arranged extending in the vertical direction between the protrusion portion and the lower support portion, wherein the spring constant of the lower spring member is greater than the spring constant of the upper spring member.

2. An impact absorbing mechanism for an electronic device protective case comprising: an upper support portion and a lower support portion provided on a movable body and spaced apart from each other in the vertical direction; a protrusion protruding to the side of the electronic device protective case and arranged between the upper support portion and the lower support portion; a guide mechanism connecting the protrusion to the upper support portion and the lower support portion so that the protrusion can move up and down; an upper spring member arranged extending in the vertical direction between the upper support portion and the protrusion portion; and a lower spring member arranged extending in the vertical direction between the protrusion portion and the lower support portion, wherein the upper spring member and the lower spring member are each composed of a compression coil spring.

3. a guide mechanism for connecting the protrusion to the upper support part and the lower support part so that the protrusion can move up and down relative to the upper support part and the lower support part; an upper spring member disposed extending in the vertical direction between the upper support part and the protrusion; and a lower spring member disposed extending in the vertical direction between the protrusion and the lower support part, wherein when the protrusion and the electronic device protective box move above a standard installation position which is a height position relative to the lower support part at which the protrusion is located in normal times when no impact is applied to the moving body, the upper spring member contracts to apply a downward biasing force to the protrusion, and when the protrusion and the electronic device protective box move below the standard installation position in normal times, the upper spring member assumes a natural length and does not apply a biasing force to the protrusion.

4. An impact absorbing mechanism for an electronic device protective box as described in claim 2 or 3, wherein the electronic device protective box is installed on a spreader of a crane that handles containers.

5. A method for absorbing impact for an electronic device protective box, comprising: a protrusion that protrudes to the side of an electronic device protective box is disposed between an upper support portion and a lower support portion that are spaced apart from each other in the vertical direction on a moving body; the protrusion is connected to the upper support portion and the lower support portion so that it can move up and down relative to the upper support portion and the lower support portion; and when an impact is applied to the moving body, an upper spring member that is disposed extending in the vertical direction between the upper support portion and the protrusion, and a lower spring member that is disposed extending in the vertical direction between the protrusion and the lower support portion contract and restore to absorb the impact acting on the electronic device protective box, wherein the spring constant of the lower spring member is made greater than the spring constant of the upper spring member.

6. A method for absorbing impact for an electronic device protective box, comprising: arranging a protrusion that protrudes to the side of the electronic device protective box between an upper support part and a lower support part that are provided on a movable body and spaced apart from each other in the vertical direction, and connecting the protrusion so that it can move up and down relative to the upper support part and the lower support part; and when an impact is applied to the movable body, an upper spring member that is arranged to extend in the vertical direction between the upper support part and the protrusion, and a lower spring member that is arranged to extend in the vertical direction between the protrusion and the lower support part contract and restore to their original state, thereby absorbing the impact acting on the electronic device protective box, wherein the upper spring member and the lower spring member are each constructed from a compression coil spring.

7. A protruding portion that protrudes to the side of the electronic device protective case is disposed between an upper support portion and a lower support portion that are provided on the moving body and spaced apart from each other in the vertical direction, and the protruding portion is connected to the upper support portion and the lower support portion so as to be vertically movable. When an impact is applied to the moving body, an upper spring member that is disposed to extend in the vertical direction between the upper support portion and the protruding portion and a lower spring member that is disposed to extend in the vertical direction between the protruding portion and the lower support portion contract and restore to their original state, and the impact acting on the electronic device protective case is absorbed by the contraction and restoration of the upper spring member that is disposed to extend in the vertical direction between the protruding portion and the lower support portion. a standard installation position which is a height position relative to the lower support part at which the protrusion is located under normal conditions when no impact is applied, and when the protrusion and the electronic device protective case move above the standard installation position, the upper spring member contracts to apply a downward biasing force to the protrusion, and when the protrusion and the electronic device protective case move below the standard installation position under normal conditions and when no impact is applied, the upper spring member assumes a natural length and does not apply a biasing force to the protrusion.

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