JP6335941B2 - Fall prevention device - Google Patents

Description

  The present invention relates to a tipping prevention device for preventing a tipping of an article.

  As a conventional overturn prevention device, Patent Document 1 discloses an apparatus including an upper base plate, a lower base plate, and a column attached between the upper base plate and the lower base plate.

Utility Model Registration No. 3028334

  In the fall prevention device described in Patent Document 1, since the support column is a rigid body, when a large earthquake occurs, there is a risk of receiving a load between the furniture and the ceiling and damaging it. Even if the support is not damaged, the furniture and ceiling may be damaged.

  In addition, when the furniture is greatly shaken, the distance between the furniture and the ceiling becomes large, and the fall prevention device may come off between the furniture and the ceiling.

  This invention is made | formed in view of the said problem, and it aims at providing the fall prevention apparatus which can prevent the fall of an article | item effectively.

  The present invention relates to an overturn prevention device for preventing an article from overturning, wherein an article side base portion that can contact the article, a ceiling side base portion that can contact a ceiling, and both end portions are the article side base portion. And a damper that is rotatably connected to the base portion on the ceiling side and generates a damping force by an expansion and contraction operation accompanying the swing of the article, and a biasing means that biases the damper in the extending direction. Includes a cylinder filled with a working fluid, a piston that is slidably inserted into the cylinder and divides the inside of the cylinder into two pressure chambers, and the piston is provided in the piston, and the 2 in accordance with the expansion and contraction of the damper. A damping force generator that generates a damping force by applying resistance to the flow of the working fluid between the two pressure chambers, and the piston is always immersed in the working fluid in the installed state of the overturn prevention device With features That.

  According to the present invention, since the damper generates a damping force by the expansion and contraction operation accompanying the swing of the article, the swing of the article is suppressed. Further, since the damper is rotatably connected to the article side base portion and the ceiling side base portion, the damper follows the swing of the article. Therefore, the article can be effectively prevented from falling.

It is a front view which shows the fall prevention apparatus which concerns on 1st Embodiment of this invention. It is a front view which shows the example of a use condition of the fall prevention apparatus which concerns on 1st Embodiment of this invention. It is a block diagram of the damper in the fall prevention apparatus which concerns on 1st Embodiment of this invention. (A) is a figure which shows operation | movement of the fall prevention apparatus which concerns on 1st Embodiment of this invention, (b) is a figure which shows operation | movement of the fall prevention apparatus as a comparative example. It is a figure which shows the fall test result of the fall prevention apparatus which concerns on embodiment of this invention. It is a front view which shows the fall prevention apparatus which concerns on 2nd Embodiment of this invention. The fall test result at the time of installing the fall prevention device by changing the inclination angle of the damper with respect to the vertical direction is shown. The enlarged view of the goods side base part vicinity is shown. It is a figure of the state which the damper contact | abutted to the jig | tool, Comprising: (a) is a front view, (b) is a top view, (c) is a side view. It is a front view which shows the modification of the fall prevention apparatus which concerns on 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
With reference to FIGS. 1-3, the fall prevention apparatus 100 which concerns on 1st Embodiment of this invention is demonstrated. The fall prevention device 100 is a device that prevents the fall of articles such as furniture and home appliances due to an earthquake or the like. Hereinafter, the furniture 10 will be described as an example of the article.

  As shown in FIGS. 1 and 2, the fall prevention device 100 includes an article-side base portion 1 that can contact furniture 10, a ceiling-side base portion 2 that can contact a ceiling 11, an article-side base portion 1, and a ceiling-side base. And a damper 3 interposed between the unit 2 and the unit 2.

  The article-side base portion 1 includes a base portion 1a whose bottom surface is in surface contact with the top surface 10a of the furniture 10, and a connecting portion 1b connected to the damper 3. Similarly, the bottom portion of the ceiling-side base portion 2 is also ceiling-shaped. 11, a base portion 2 a that makes surface contact with 11, and a connecting portion 2 b that is connected to the damper 3. The article-side base portion 1 may have any shape as long as it contacts the article and is connected to the damper 3. Similarly, the ceiling-side base portion 2 may have any shape as long as it contacts the ceiling 11 and is connected to the damper 3.

  As shown in FIG. 3, the damper 3 includes a cylinder 31 filled with hydraulic oil (working fluid), and a rod-side pressure chamber 32 that is slidably inserted into the cylinder 31 and has two pressure chambers inside the cylinder 31. A piston 34 that is partitioned into the non-rod-side pressure chamber 33 and a rod 35 having one end connected to the piston 34 and the other end extending to the outside of the cylinder 31 are provided.

  A bracket 36 is provided at the bottom of the cylinder 31, and the bracket 36 and the connecting portion 1 b of the article-side base portion 1 are rotatably connected via a pin 51. A bracket 37 is provided at the tip of the rod 35, and the bracket 37 and the connecting portion 2 b of the ceiling side base portion 2 are rotatably connected via a pin 52. In this way, the cylinder 31 and the article side base portion 1 are rotatably connected via the pin 51, and the rod 35 and the ceiling side base portion 2 are rotatably connected via the pin 52. That is, both ends of the damper 3 are rotatably connected to the article side base portion 1 and the ceiling side base portion 2 via the bracket 36 and the bracket 37.

  The opening formed at the end of the cylinder 31 is sealed with a rod guide 38 that supports the rod 35. The rod 35 is slidably inserted through the rod guide 38. An annular seal member 39 is provided side by side with the rod guide 38 between the outer peripheral surface of the rod 35 and the inner peripheral surface of the cylinder 31.

  The piston 34 has an orifice as a damping force generator that generates a damping force by applying resistance to the flow of hydraulic oil between the rod-side pressure chamber 32 and the anti-rod-side pressure chamber 33 accompanying the expansion / contraction operation of the damper 3. 40 is provided.

  Further, the piston 34 is provided with a check valve 41 that allows only the flow of hydraulic oil between the rod-side pressure chamber 32 and the anti-rod-side pressure chamber 33 accompanying the extension operation of the damper 3. That is, the check valve 41 allows only the flow of hydraulic oil from the rod side pressure chamber 32 to the non-rod side pressure chamber 33. Therefore, the damping force generated during the extension operation of the damper 3 is smaller than that during the contraction operation.

  The damper 3 is filled with nitrogen gas 42 as compressed gas in the cylinder 31, and has a spring force that acts in the extending direction by the gas pressure of the nitrogen gas 42. That is, in this embodiment, a gas spring is used as a biasing unit that biases the damper 3 in the extending direction. The damper 3 generates a spring force in the extending direction due to the difference between the pressure receiving area of the piston 34 facing the rod side pressure chamber 32 and the pressure receiving area of the piston 34 facing the non-rod side pressure chamber 33. When the overturn prevention device 100 is installed so that the damper 3 is oriented as shown in FIG. 3, the nitrogen gas 42 moves upward and is enclosed in the rod side pressure chamber 32 as shown in FIG. 3. become. On the other hand, when the overturn prevention device 100 is installed so that the damper 3 is 180 degrees opposite to the direction shown in FIG. 3, the nitrogen gas 42 moves upward and is enclosed in the anti-rod side pressure chamber 33. Will be.

  When the fall prevention device 100 is installed between the furniture 10 and the ceiling 11, the fall prevention device 100 is inserted between the furniture 10 and the ceiling 11 with the damper contracted against the spring force of the damper 3. To do. The damper 3 is extended by gas pressure between the furniture 10 and the ceiling 11 to bring the base 1a of the article-side base portion 1 into surface contact with the furniture 10, and the base 2a of the ceiling-side base portion 2 comes into surface contact with the ceiling 11. Let Since the damper 3 has a spring force acting in the extending direction by the gas pressure of the nitrogen gas 42, the article-side base portion 1 and the ceiling-side base portion 2 are urged away from each other by the spring force of the damper 3 and the furniture 10. Pressed against the ceiling 11. In this way, the fall prevention device 100 is firmly fixed between the furniture 10 and the ceiling 11 (see FIG. 2).

  Next, the operation of the overturn prevention device 100 will be described with reference to FIG.

  FIG. 4A is a diagram showing a state in which the fall prevention device 100 is installed between the top surface 10a of the furniture 10 and the ceiling 11, and the furniture 10 is shaken due to an earthquake or the like. FIG. 4B is a diagram illustrating a state in which the fall prevention device 101 as a comparative example is installed between the top surface 10a of the furniture 10 and the ceiling 11, and the furniture 10 is shaken due to an earthquake or the like.

  As shown in FIG. 4 (a), the damper 3 is rotatably connected between the article-side base portion 1 and the ceiling-side base portion 2, so that when the furniture 10 shakes, the article-side base portion 1 and The damper 3 follows the movement of the furniture 10. Further, as the furniture 10 shakes, the distance between the top surface 10a of the furniture 10 and the ceiling 11 changes. Since the damper 3 expands and contracts according to the change in the interval to generate a damping force, the vibration of the damper 3 is suppressed.

  As described above, when the furniture 10 is shaken, the article-side base 1 and the damper 3 follow the movement of the furniture 10, and the damper 3 generates a damping force due to the expansion and contraction operation accompanying the shaking of the furniture 10. The fall prevention device 100 effectively prevents the furniture 10 from overturning by preventing the furniture 10 from shaking between the furniture 10 and the ceiling 11 and without damaging the furniture 10 and the ceiling 11.

  Further, since the piston 34 is provided with a check valve 41 that allows only the flow of hydraulic oil from the rod-side pressure chamber 32 to the non-rod-side pressure chamber 33, the damping force during the extension operation of the damper 3 is moderate. It is not large, and the damper 3 extends quickly. Therefore, even when the damper 3 is extended to increase the distance between the top surface 10a of the furniture 10 and the ceiling 11, the ceiling-side base portion 2 is not separated from the ceiling 11. Therefore, the fall prevention device 100 from between the furniture 10 and the ceiling 11 is prevented more effectively.

  As shown in FIG. 4B, a fall prevention device 101 as a comparative example is configured such that a rod 60 is non-rotatably connected between the article-side base portion 1 and the ceiling-side base portion 2. Since the overturn prevention device 101 cannot follow the movement of the furniture 10, there is a risk that it will come off between the furniture 10 and the ceiling 11 when the furniture 10 is shaken. In addition, when the interval between the top surface 10a of the furniture 10 and the ceiling 11 is narrowed, the fall prevention device 101 receives a large compressive force between the furniture 10 and the ceiling 11, so that the fall prevention device 101 breaks or the furniture 10 The ceiling 11 may be damaged. Thus, in the fall prevention device 101, the fall of the furniture 10 cannot be effectively prevented.

  FIG. 5 shows the result of the fall test of the furniture 10.

  FIG. 5 shows the result of a tipping test performed by generating a sine wave with a testing machine. FIG. 5A shows the result when the fall prevention device is not used, FIG. 5B shows the result when the fall prevention device 101 is used, and FIG. 5C shows the result when the fall prevention device 100 is used. Is the result of the case. 5A, 5 </ b> B, and 5 </ b> C, the vertical axis on the left is the amount of upper displacement of the furniture 10, the vertical axis on the right is the amount of displacement of the testing machine (the amplitude of the sin wave), and the horizontal axis is time. .

  In the fall test, for safety, the furniture 10 was supported so that the upper displacement amount of the furniture 10 was not 700 mm or more. When the upper displacement amount reaches 700 mm, the furniture 10 is the displacement amount in a situation where the furniture 10 is falling. As shown in FIG. 5A, when the fall prevention device is not used, the upper displacement amount of the furniture 10 reaches a maximum of 700 mm in about 8 seconds. As shown in FIG. When using, the upper displacement amount of the furniture 10 reached a maximum of 700 mm in about 15 seconds. On the other hand, as shown in FIG.5 (c), when the fall prevention apparatus 100 was used, the furniture 10 hardly displaced.

  As can be seen from the fall test results shown in FIG. 5, it was confirmed that the fall prevention device 100 can effectively prevent the furniture 10 from falling by suppressing the swing of the furniture 10.

  According to the above 1st Embodiment, there exists an effect shown below.

  Since the damper 3 generates a damping force by the expansion and contraction operation accompanying the swing of the furniture 10, the swing of the furniture 10 is suppressed. Further, since the damper 3 is rotatably connected to the article-side base portion 1 and the ceiling-side base portion 2, the damper 3 follows the shaking of the furniture 10. Therefore, the furniture 10 can be effectively prevented from falling.

Second Embodiment
As shown in FIG. 6, as a method for installing the overturn prevention device 100, it is desirable to install the damper 3 by tilting it with respect to the vertical direction. That is, the article side base portion 1 and the ceiling side base portion 2 are arranged so as to be shifted in the horizontal direction. By installing the fall prevention device 100 in this manner, the furniture 10 can be prevented from falling more effectively. Below, the inclination installation of the fall prevention apparatus 100 is demonstrated in detail.

  The damper 3 is arranged in a vertical direction by disposing the bracket 37 connected to the ceiling side base portion 2 away from the wall 12 along which the back surface 10b of the furniture 10 extends rather than the bracket 36 connected to the article side base portion 1. It is inclined with respect to. Specifically, the damper 3 is disposed at a position where the ceiling side base portion 2 is farther from the wall 12 along which the back surface 10b of the furniture 10 extends than the article side base portion 1. When the article-side base portion 1 and the ceiling-side base portion 2 are arranged so as to be shifted in the horizontal direction in this way, when the furniture 10 is shaken and the upper side of the furniture 10 is tilted away from the wall 12, the damper 3 Since the spring force acting in the extending direction acts to suppress the inclination of the furniture 10, that is, to try to return the furniture 10 to the original position, the furniture 10 is more effectively prevented from falling. On the other hand, when the furniture 10 is shaken and the upper side of the furniture 10 is inclined in a direction approaching the wall 12, the furniture 10 abuts against the wall 12 and does not fall down. When the article side base part 1 and the ceiling side base part 2 are arranged in the opposite direction to FIG. 6, that is, when the article side base part 1 is arranged at a position farther from the wall 12 than the ceiling side base part 2. For this reason, the spring force acting in the extension direction of the damper 3 acts in the direction of promoting the shaking of the furniture 10, which is not preferable. Even when the furniture 10 is not installed along the wall 12, if the damper 3 is disposed between the furniture 10 and the ceiling 11, the furniture 10 can be more effectively prevented from falling. . In that case, the inclination direction of the damper 3 with respect to the vertical direction may be inclined in any direction.

  FIG. 7 shows a fall test result when the fall prevention device 100 is installed by changing the inclination angle α (see FIG. 6) of the damper 3 with respect to the vertical direction. FIG. 7A shows the result when the tilt angle α is 15 degrees, FIG. 7B shows the result when the tilt angle α is 20 degrees, and FIG. 7C shows the result when the tilt angle α is 25 degrees. Is the result of. 7A, 7 </ b> B, and 7 </ b> C, the left vertical axis is the upper displacement amount of the furniture 10, the right vertical axis is the displacement amount of the testing machine, and the horizontal axis is time. In addition, FIG. 7 is the result of having performed the fall test by generating the shaking of the seismic intensity 7 with a testing machine.

  As can be seen from FIGS. 7 (a), (b), and (c), the furniture 10 hardly displaced and did not fall over in any case where the inclination angle was 15, 20, or 25 degrees. Of the inclination angles of 15, 20, and 25 degrees, the displacement of the furniture 10 was the smallest when the inclination angle was 20 degrees.

  As shown in FIG. 7, the inclination angle α (see FIG. 6) of the damper 3 with respect to the vertical direction is preferably 15 degrees or more and 25 degrees or less. When the inclination angle is less than 15 degrees, when the furniture 10 is greatly inclined and the upper side of the furniture 10 moves away from the wall 12, the spring force in the extension direction of the damper 3 may act to further tilt the furniture 10. There is. On the other hand, when the inclination angle α of the damper 3 with respect to the vertical direction is set to 15 degrees or more, even when the furniture 10 is greatly inclined and the upper side of the furniture 10 moves away from the wall 12, the spring force acting in the extending direction of the damper 3 is the furniture 10 Acts to return to the original position. Therefore, the inclination angle α of the damper 3 with respect to the vertical direction is preferably set to 15 degrees or more. When the inclination angle exceeds 25 degrees, the horizontal component of the spring force in the extension direction of the damper 3 is the frictional force between the article-side base portion 1 and the top surface 10a of the furniture 10 or the ceiling-side base portion 2. There is a possibility that the article side base portion 1 or the ceiling side base portion 2 slips and the overturn prevention device 100 comes off between the furniture 10 and the ceiling 11 because the frictional force with the ceiling 11 becomes larger. On the other hand, when the inclination angle α of the damper 3 with respect to the vertical direction is set to 25 degrees or less, the horizontal component of the spring force in the extension direction of the damper 3 is the frictional force between the article-side base portion 1 and the top surface 10a of the furniture 10 or Since it becomes smaller than the frictional force between the ceiling side base portion 2 and the ceiling 11, the article side base portion 1 or the ceiling side base portion 2 does not slide. Therefore, the inclination angle α of the damper 3 with respect to the vertical direction is preferably set to 25 degrees or less.

  Thus, in order to make the fall prevention device 100 function so as to effectively prevent the furniture 10 from shaking, the inclination angle of the damper 3 is important. Below, when installing the fall prevention apparatus 100 between the furniture 10 and the ceiling 11, the method for setting easily the inclination-angle of the damper 3 in the optimal range of 15 degrees or more and 25 degrees or less is demonstrated.

  FIG. 8 shows an enlarged view of the vicinity of the article-side base portion 1. As shown in FIG. 8, the display part 70 which shows the attachment angle of the damper 3 with respect to a perpendicular direction is attached | subjected to the connection part 1b of the goods side base part 1. As shown in FIG. The display unit 70 indicates an optimum range of the inclination angle of the damper 3, specifically, a range of 15 degrees to 25 degrees. The display unit 70 indicates the range of the inclination angle α (see FIG. 6) of the damper 3 around the pin 51 of the connecting unit 1b, and is attached at a position where the user can easily see.

  On the other hand, the damper 3 that is rotatably connected to the article-side base portion 1 is provided with a mark 71 along the axial direction of the damper 3. The mark 71 is attached to the bracket 36 of the damper 3 that is rotatably connected to the connecting portion 1 b of the article-side base portion 1.

  When the fall prevention device 100 is installed between the furniture 10 and the ceiling 11, the damper 3 is positioned so that the mark 71 attached to the damper 3 is located within the range of the display unit 70 attached to the article-side base portion 1. Inclined and installed. As described above, the inclination angle of the damper 3 can be easily set within the optimum range simply by matching the mark 71 attached to the damper 3 with the display portion attached to the article-side base portion 1.

  You may make it attach the display part 70 and the mark 71 to the connection part 2b of the ceiling side base part 2, and the bracket 37 of the damper 3. As shown in FIG. Further, it may be attached to the connecting portion 1 b of the article-side base portion 1 and the bracket 36 of the damper 3, and may also be attached to the connecting portion 2 b of the ceiling-side base portion 2 and the bracket 37 of the damper 3. As described above, the display unit 70 is attached to at least one of the connection unit 1b of the article-side base unit 1 and the connection unit 2b of the ceiling-side base unit 2, and the mark 71 is at least one of the bracket 36 and the bracket 37 of the damper 3. It is attached to.

  Next, a method for setting the inclination angle of the damper 3 within the optimum range using the jig 80 will be described with reference to FIG. FIGS. 9A, 9B, and 9C are a front view, a plan view, and a side view, respectively, of the state where the damper 3 is in contact with the jig 80. FIG.

  The jig 80 is supported across a pair of leg portions 81a and 81b extending in the vertical direction at a predetermined interval and the pair of leg portions 81a and 81b, and the fall prevention device 100 is installed between the furniture 10 and the ceiling 11. And an inclination angle setting unit 82 for setting the mounting angle of the damper 3 with respect to the vertical direction.

  As shown in FIG. 9C, the pair of leg portions 81 a and 81 b are formed so that the distance between them is equal to the width of the base portion 1 a of the article-side base portion 1.

  The inclination angle setting portion 82 is formed to extend in the vertical direction and can be brought into contact with the side surface of the connecting portion 1b of the article-side base portion 1, and the cylinder 31 of the damper 3 formed to be inclined with respect to the vertical direction. And an inclined surface 82b with which the outer peripheral surface can abut. The inclination angle of the inclined surface 82b is set to an angle within the optimum range of the inclination angle of the damper 3. In the present embodiment, the inclined surface 82b is formed with an inclination of 20 degrees with respect to the vertical direction.

  When the fall prevention device 100 is installed between the furniture 10 and the ceiling 11, first, the base 1a of the article-side base 1 is supported by the pair of legs 81a and 81b with the damper 3 standing upright without being inclined. In addition, the jig 80 is placed on the top surface 10a of the furniture 10 so that the vertical surface 82a of the inclination angle setting portion 82 is in contact with the side surface of the connecting portion 1b of the article-side base portion 1.

  Next, the damper 3 is tilted toward the jig 80, and the outer peripheral surface of the cylinder 31 is brought into contact with the inclined surface 82b of the inclination angle setting portion 82 (state shown in FIG. 9). Since the inclined surface 82b is formed so as to be inclined 20 degrees with respect to the vertical direction, the damper 30 in contact with the jig 80 is inclined 20 degrees with respect to the vertical direction. In this state, the jig 80 is removed.

  Thus, by bringing the outer peripheral surface of the cylinder 31 into contact with the inclined surface 82b of the jig 80, the inclination angle of the damper 3 can be easily set within the optimum range.

  As described above in the second embodiment, the fall of the furniture 10 is effectively prevented by inclining the damper 3 with respect to the vertical direction and installing the fall prevention device 100 between the furniture 10 and the ceiling 11. Can do. Moreover, by setting the inclination angle of the damper 3 with respect to the vertical direction to 15 degrees or more and 25 degrees or less, the furniture 10 can be more effectively prevented from falling.

  As mentioned above, although embodiment of this invention was described, the said embodiment showed only a part of application example of this invention, and the meaning which limits the technical scope of this invention to the specific structure of the said embodiment. Absent.

  For example, in the above-described embodiment, the damper 3 is inclined with respect to the vertical direction by the ceiling-side base portion 2 being disposed at a position farther from the wall 12 along which the back surface 10b of the furniture 10 extends than the article-side base portion 1. Are arranged. Instead, as shown in FIG. 10, the width of the base 2 a of the ceiling-side base 2 is formed larger than the width of the base 1 a of the article-side base 1, and then the base 2 a of the ceiling-side base 2 and You may make it arrange | position the damper 3 inclining with respect to a perpendicular direction by arrange | positioning the base 1a of the article | base side base part 1 in contact with the wall 12. FIG.

  Moreover, in the said embodiment, it was set as the structure which has the spring force which the damper 3 acts in an expansion | extension direction for enclosing compressed gas in the cylinder 31. FIG. Instead of enclosing the compressed gas in the cylinder 31, a spring as an urging means may be compressed and provided in the anti-rod side pressure chamber 33. Even if comprised in this way, the damper 3 has the spring force which acts on the expansion | extension direction.

DESCRIPTION OF SYMBOLS 100 Fall prevention device 1 Article side base part 2 Ceiling side base part 3 Damper 10 Furniture (article)
11 Ceiling 40 Orifice (damping force generator)
41 Check Valve 42 Nitrogen Gas 51, 52 Pin 70 Display Unit 71 Marking 80 Jig 82 Inclination Angle Setting Unit 82a Vertical Surface 82b Inclined Surface

Claims (1)

A fall prevention device for preventing an article from falling,
An article-side base that can contact the article;
A ceiling-side base that can contact the ceiling;
Each of both end portions is rotatably connected to the article-side base portion and the ceiling-side base portion, and a damper that generates a damping force by an expansion / contraction operation associated with the shaking of the article,
Biasing means for biasing the damper in the extending direction,
The damper is
A cylinder filled with a working fluid;
A piston that is slidably inserted into the cylinder and divides the inside of the cylinder into two pressure chambers;
A damping force generating portion provided on the piston and generating a damping force by applying a resistance to the flow of the working fluid between the two pressure chambers accompanying the expansion and contraction operation of the damper;
The fall prevention device, wherein the piston is always immersed in the working fluid in the installed state of the fall prevention device.

Images