JP2008032173A - Overturning-prevention device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overturning-prevention device to surely prevent overturning of a heavy apparatus by vibration of an earthquake or the like even in the case of installing a box-shaped apparatus body indoors where fixing bolts cannot be installed. <P>SOLUTION: The overturning-prevention device arranged between a box-shaped apparatus body with width larger than the depth and an installation floor surface, comprises an installation base member fixed to the bottom of the box-shaped apparatus body, a rail member wherein arc-shaped rails for slidably supporting the installation base member are arranged on the installation floor surface from the front face through the rear face of the apparatus body, and a restoration force applying means for restoring the installation base member to a steady state resisting the displacement of the installation base member toward the front/rear faces in addition to the restoring force deriving from own weight of the arc-shaped rails and the installation base member. The center of curvature radius of the arc-shaped rails is positioned higher than the position of the center of gravity of the apparatus body plus the installation base member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a toppling prevention device that can prevent a mounted main body from overturning even in a situation where a fixing bolt cannot be fixed directly or indirectly, for example, indoors.

  As a seismic isolation device that can prevent the device body from falling even when vibration such as an earthquake acts on a box-shaped device body whose width is larger than the depth of a vending machine or a storage cabinet, for example, A pair of device support portions attached to the bottom portion, a pair of trays that movably support the device support portions, and a body frame that slidably accommodates the trays, the body frame having a predetermined length A rectangular cylinder with a central opening on one side and a longitudinal opening that is placed on the floor with the opening facing up, and the tray is rectangular and has a liner on the bottom and a top. A device having a dish-like shape having a concave portion having a slanted surface with a moderately hollow shape, slidably disposed in the main body frame, and the device support portion having means capable of moving on the inclined surface of the tray. A support body and the machine Seismic isolation structure consisting of a bolt for equipment attachment provided on the support body top has been proposed (e.g., Patent Document 1).

  In this conventional seismic isolation device, in the event of an earthquake, the saucer and the body frame first move back and forth with the floor as the ground shakes, but the equipment support and equipment on the saucer are stationary based on their mass. The position is not changed by the inertia force, but is simply moved up and down by the inclined surface of the tray. When the earthquake further increases, the wall of the saucer comes into contact with the device support and stops. Therefore, a crease occurs between the saucer and the main body frame, but the device support and the device remain stationary. In this way, even if there is an earthquake, the equipment is stationary and will not fall over.

JP 2000-145881 A

  However, it is effective when the seismic amplitude is short and a static inertia force based on the mass of the equipment works, but an earthquake with a seismic amplitude greater than the length of the saucer or a static inertia force does not work. On the other hand, there is a risk that the seismic isolation device may fall over in the event of a slow vibration.

  An object of the present invention is to provide a fall prevention device that reliably prevents a heavy equipment from falling down due to vibration such as an earthquake even when a box-like device body is installed indoors where a fixing bolt cannot be installed. .

The fall prevention device according to the invention described in claim 1 is the fall prevention device arranged between the box-shaped device body whose width is larger than the depth and the installation floor surface.
An installation base member fixed to the bottom of the box-shaped apparatus main body, and an arc-shaped rail that slidably supports the installation base member are arranged on the installation floor surface from the front surface to the rear surface of the box-shaped apparatus main body. In addition to the restoring force due to the weight of the arc member and the mounting base member, a restoring force adding means for restoring the mounting base member to a steady state against the displacement of the installation base member to the front and rear surfaces. Prepared,
The arc-shaped rail is characterized in that the center of curvature radius is a height position higher than the center of gravity height position of the box-shaped apparatus main body and the installation base member.

  According to a second aspect of the present invention, the fall prevention device according to the second aspect is characterized in that the installation base member according to the second aspect is provided with a roller that rolls on the arc-shaped rail.

In the fall prevention device according to the invention described in claim 3, the restoring force adding means according to claim 1 or 2,
A projecting pin projecting to the side of the installation table member;
A front slider that is in contact with the front side direction of the projecting pin and is movable forward only from a steady position together with a displacement in the front direction of the installation base member;
A front spring for restoring the forward displacement of the front slider to a steady position;
A rear slider that is in contact with the rear side of the projecting pin and can move only from the steady position to the rear along with the rearward displacement of the installation base member;
Thereafter, a rear spring for restoring the rearward displacement of the slider to a steady position is provided.

  The fall prevention device according to the invention described in claim 4 further includes deviation prevention means that allows the operation of the installation base member according to any one of claims 1 to 3 only on the arc-shaped rail track. It is characterized by.

  As described above, the present invention has an effect of reliably preventing the heavy box-shaped device body from falling down due to vibration such as an earthquake even when the box-shaped device body is installed indoors where a fixing bolt cannot be installed. is there.

  In the present invention, in the fall prevention device disposed between the box-shaped device body having a width greater than the depth and the installation floor, an installation table member fixed to the bottom of the box-shaped device body, and the installation table member In addition to the restoring force due to the weight of the arc-shaped rail and the installation base member, and the rail member in which the arc-shaped rail that slidably supports the rail is disposed on the installation floor surface from the front surface to the rear surface of the box-shaped device main body. And a restoring force adding means for restoring the installation table member to a steady state against the displacement of the installation table member in the front-rear surface, wherein the arc-shaped rail has a high center of gravity between the box-shaped device body and the installation table member. The height position higher than the height position is the center of the radius of curvature. Thereby, even when a box-shaped device main body is installed indoors where a fixing bolt cannot be installed, it is possible to reliably prevent a heavy device from falling due to vibration such as an earthquake.

  Specifically, in the fall prevention device of the present invention, the lateral width is arranged in the box-shaped device body larger than the depth. That is, the vibration in the horizontal width direction is excluded because it is determined that it is extremely rare to fall in the horizontal width direction. On the other hand, in a device main body whose depth is thinner than the width as in a vending machine in recent years, it easily falls down in the front-rear direction with respect to the depth. Therefore, the rail member is disposed on the installation floor surface from the front surface to the rear surface. In order to maintain balance, a pair is arranged at least on both side edge portions of the box-shaped device main body.

  Specific examples of the box-shaped device main body according to the present invention include indoor vending machines and storage cabinets that cannot be fitted with fixing bolts, heavy safes, lockers, bookshelves, furniture such as chests, etc. TV stand and the like.

  The rail member includes an arc-shaped rail whose center of curvature radius is a height position higher than the center-of-gravity height position between the box-shaped apparatus main body and the installation base member. The arc-shaped rail only needs to be able to support the load between the box-shaped apparatus main body and the installation base member fixed to the bottom.

  An installation base member is slidably disposed on the arc-shaped rail of the rail member. If it is arranged so as to be slidable on the arc-shaped rail, for example, the installation table member may be arranged to be slidable by a contact piece that contacts the rail. A roller that rolls on the arc-shaped rail may be provided, and more preferably, this roller may be provided with a mechanism that suppresses the rotation of the roller as a damper for damping the sliding of the arc-shaped rail back and forth.

  With the above configuration, even when a floor surface installed due to a vibration such as an earthquake suddenly moves, the installation base member supported by the arc-shaped rail of the rail member slides on the arc-shaped rail. Since the radius of curvature of the arc-shaped rail is longer than the distance to the center of gravity of the box-shaped device body and the installation base member, it is restored along the arc-shaped rail by its own weight, and the pendulum moves around the radius of the arc-shaped rail. Can be avoided.

  If the radius of curvature of the arc-shaped rail of the present invention is longer than the distance to the height position higher than the center of gravity height position between the box-shaped device main body and the installation base member, the fall prevention effect will be great. The swing width of the pendulum motion due to this increases, and the pop-out of the installation base member from the arc-shaped rail becomes a problem. Therefore, about 1.5 to 2.5 times the center of gravity distance is favorable.

  In addition, the vibration of the earthquake is not always constant, and there is a concern that the installation base member may jump out of the arc-shaped rail in the case of the severe shaking as described above. For this purpose, the present invention includes a restoring force adding means.

  The restoring force adding means of the present invention may be any means that restores the installation base member to a steady state against the displacement of the installation base member toward the front and rear surfaces. In addition, although the above-mentioned arc-shaped rail, installation base member, and the weight of the box-shaped device main body restore to a steady state, in the present invention, the installation base member is separated from the restoring force due to the self-weight of the arc-shaped rail and the installation base member. There is further provided a restoring force adding means for restoring the installation base member to a steady state against the displacement of the front and rear surfaces. Thereby, it is possible to prevent the installation base member from jumping out of the arc-shaped rail due to a vibration such as an earthquake.

  The restoring force adding means as a more preferable aspect includes a projecting pin projecting to the side of the installation table member, and a forward displacement of the installation table member in front of the projecting pin and only forward from a steady position together with the displacement of the installation table member in the front direction. A front slider that can be moved to the front, a front spring that restores the forward displacement of the front slider to the steady position, and a rearward displacement of the installation base member in contact with the rearward direction of the projecting pin. And a rear spring for restoring the rearward displacement of the rear slider to a steady position. This not only prevents the installation base member from jumping out of the arc-shaped rail due to earthquakes and other vibrations, but also arranges the spring via the front / rear slider that can move only forward or only rearward. Is not transmitted to the installation base member beyond the steady position. Therefore, the pendulum motion can be attenuated and it works as a kind of damper.

  Incidentally, a damper means for attenuating the pendulum motion may be provided in the restoring force adding means or separately from the restoring force adding means.

  Moreover, the installation base member and rail member of the fall prevention device of the present invention are arranged so as not to deviate in the event of an earthquake. Therefore, as a preferable aspect, a deviation preventing means that allows the operation of the installation base member only on the arc-shaped rail track is further provided. That is, a measure is taken to prevent a lateral displacement of the installation base member of the fall prevention device with respect to the longitudinal direction of the arc-shaped rail with respect to the rail member so that the position in the width direction of the box-like device body does not shift with respect to the fall prevention device. .

  For example, a mechanism for holding a member such as a front / rear slider that holds the installation base member of the fall prevention device from both sides with a holding member such as a housing that holds the rail member, or the installation base member from one side At least one pair of anti-falling devices is provided on the side of the box-like device main body with respect to the front of the device main body. It also includes a composite mechanism that holds the installation base member so as not to be laterally displaced with respect to the arc-shaped rail so as to be arranged symmetrically.

  More preferably, a guide piece that is parallel to the arc-shaped rail and is capable of coming into contact with the side of the installation base member is provided, and a guide protrusion that protrudes from the guide piece side of the installation base member penetrates the guide piece. A guide groove is provided, and the guide groove is formed in a shape along the arc-shaped rail so as to allow movement of the installation base member that moves on the arc-shaped rail. The front and rear ends of the groove are provided at positions where the installation base member does not jump out of the arc-shaped rail due to an earthquake or the like. In the fall prevention device provided with this guide piece, at least one pair of fall prevention devices is arranged on the side of the box-shaped device body so as to be symmetrical with respect to the front surface of the device body.

  As described above, the guide piece having the guide groove that allows the operation of the installation base member only on the arc-shaped rail track prevents the installation base member from jumping out of the arc-shaped rail and deviating from the horizontal deviation from the arc-shaped rail. can do.

  FIG. 1 is a front view and a side view showing the configuration of a vending machine equipped with the fall prevention device of the present invention. FIG. 2 is an explanatory view showing the behavior when the fall prevention device of the present invention is prevented from falling, and an explanatory diagram showing the behavior when the fall prevention device is not mounted.

  As shown in FIG. 1, a pair of fall prevention devices 20 are arranged in the depth direction on the legs 11 at the bottoms of both sides of the vending machine 10 as a box-shaped device body whose width is larger than the depth. As shown in FIG. 2a, the fall prevention device 20 supports the box-shaped device body 10 with a curved surface having a center 16 having a radius of curvature higher than the position of the center of gravity 15, thereby generating vibration such as an earthquake. When the floor surface installed in this way suddenly moves, the pendulum motion around the radius of curvature is performed to prevent the box-shaped device body 10 from overturning.

  In the first place, as shown in FIG. 2 b, the box-shaped device body 10 falls when the center of gravity 15 of the box-shaped device body 10 tilts beyond the bottom surface of the body 10. As shown in FIG. a, by supporting the main body 10 with a curved surface having the center of the radius of curvature at a position higher than the center of gravity 15 of the box-shaped apparatus main body 10, the swing width of the center of gravity 15 is substantially narrowed, resulting in severe shaking. There is no fall.

  A specific configuration of the fall prevention device will be described. FIG. 3 is an explanatory view showing the main configuration of an embodiment of the fall prevention device of the present invention. 4 is a plan view, a side view, a front view, and a side view at the time of behavior of the overturn prevention device of FIG. As shown in FIG. 3, the fall prevention device 30 of this embodiment includes an installation base member 31 fixed to the leg portion 12 at the bottom of the box-shaped device body 10, and an arcuate rail that supports the installation base member 31 in a slidable manner. 36 includes a rail member 35 disposed on the installation floor surface from the front surface to the rear surface of the box-shaped device main body 10.

  The installation base member 31 has an external appearance in which a rectangular metal plate is bent into a concave shape with a cross-section in the longitudinal direction, and a projecting pin 32 is disposed through the both sides at the center in the longitudinal direction. Rollers 33 are arranged on the lower surfaces of both end edges in the longitudinal direction. The rail member 35 has an appearance in which a rectangular cross section of a rising portion obtained by bending a rectangular metal plate into a convex shape in the longitudinal direction is cut into an arc shape. A portion obtained by cutting out the rising portion into an arc shape is an arc-shaped rail 36, and the two rollers 33 roll on the rail so that the installation base member 31 is slidable. The upper surface of the installation base member 31 is fixed to the leg portion of the box-shaped apparatus main body 10 via an attachment plate 34 shown in FIG.

  The arc-shaped rail 36 has a center of curvature radius at a height position higher than the height position of the center of gravity of the box-shaped device body 10 and the installation base member 31. For this reason, the box-shaped apparatus main body 10 and the installation base member 31 move along the arc-shaped rail 36 due to their own weights, perform a pendulum motion around the radius of the arc-shaped rail, and avoid the fall of the box-shaped apparatus main body. A stopper piece 37 rises at the center in the longitudinal direction of the rail member 35.

  Two sliders 38 and 39 that are movable in the longitudinal direction along the arc-shaped rail 36 are disposed on both sides of the arc-shaped rail 36 of the rail member 35. One slider 38 is a front slider 38 that is in contact with the front side of the projecting pin 32 by a stopper piece 37 and can move only forward from a normal position along with the displacement of the installation base member 31 in the front direction. Is a rear slider 39 that is in contact with the rear side of the projecting pin 32 and is movable rearward from the steady position together with the rearward displacement of the installation base member 31.

  Further, since the front and rear sliders 38 and 39 are held so as to sandwich the installation base member 31, and are held between the rail member 35 and the holding member 41 that holds this inside, it is not possible to come off the rail member 35. Absent. In addition, it is possible to prevent the installation base member 31 from being laterally displaced with respect to the arc-shaped rail 36 by the front and rear sliders 38 and 39 held by these holding members 41.

  A spring 40 is attached to each of the sliders 38 and 39 so as to press the slider against the stopper piece 37. The projecting pins 32, the front slider 38, the rear slider 39, and the spring 40 can not only prevent the installation base member 31 from jumping out of the arc-shaped rail 36 by a vibration such as an earthquake as a restoring force adding means, but also perform a pendulum motion. It can be damped and acts as a kind of damper.

  FIG. 5 is a plan view, a side view, a front view, and a side view at the time of behavior of another embodiment of the fall prevention device. As shown in the drawing, the present embodiment is such that the thickness of the arc-shaped rail is increased and the front and rear sliders and the spring are arranged on one side of the arc-shaped rail with respect to the overturn prevention device shown in FIGS.

  That is, in the fall prevention device 50 of the present embodiment, the installation base member 51 fixed to the leg 11 at the bottom of the box-like device body 10 and the arc-shaped rail 56 that slidably supports the installation base member 51 are box-like. A rail member 55 disposed on the installation floor surface from the front surface to the rear surface of the apparatus main body 10.

  The installation base member 51 has an appearance in which a rectangular metal plate is bent in a concave shape with a cross-section in the longitudinal direction as in the above-described embodiment, and penetrates through the installation base member 51 at the center in the longitudinal direction on one side. The projecting pin 52 is formed so as to project long. Similarly, rollers 53 are arranged on the lower surfaces of both edge portions in the longitudinal direction.

  The rail member 55 has an appearance in which a rising portion formed by laminating four metal plates and L-shaped metal plates on both sides and integrated by welding is cut out so that the cross section is an arc shape. A portion obtained by cutting the rising portion into an arc shape is an arc-shaped rail 56, and the two rollers 53 roll on the rail so that the installation base member 51 is slidable. The upper surface of the installation base member 51 is fixed to a leg portion of the arcuate apparatus main body 10 via an attachment plate 54.

  Similarly, the arc-shaped rail 56 has a height position higher than the height position of the center of gravity between the box-shaped apparatus main body 10 and the installation base member 51 as the center of the radius of curvature, and therefore the box-shaped apparatus main body 10 and the installation base member 51. Moves along the arc-shaped rail 56 by its own weight, performs a pendulum motion around the radius of the arc-shaped rail 56, and prevents the box-shaped device body 10 from overturning. A stopper piece 57 rises at the center in the longitudinal direction of the rail member 55.

  Two sliders 58 and 59 that are movable in the longitudinal direction along the arc-shaped rail 56 are disposed on one side of the arc-shaped rail 56 of the rail member 55. One slider 58 is a front slider 58 that is brought into contact with the front side of the projecting pin 52 by the stopper piece 57 and can move only forward from a normal position along with the forward displacement of the installation base member 51, and the other slider 59. Is a rear slider 59 that is in contact with the rear side of the projecting pin 52 and is movable rearward from the steady position together with the rearward displacement of the installation base member 51.

  The front and rear sliders 58 and 59 are held in a slider groove member 61 in which the sliders 58 and 59 formed along the rail member 55 are held. In addition, it is possible to prevent the installation base member 51 from being laterally displaced with respect to the arc-shaped rail 56 by the front and rear sliders 58 and 59 held by these slider groove members 61. In particular, by disposing at least one pair of fall prevention devices on the side of the box-shaped device main body 10 so as to be bilaterally symmetric with respect to the front surface of the main body 10, it is possible to effectively prevent lateral displacement.

  A spring 60 is attached to each of the sliders 58 and 59 so as to press the slider against the stopper piece 57. The projecting pins 52, the front slider 58, the rear slider 59, and the spring 60 can not only prevent the installation base member from jumping out of the arc-shaped rail due to a vibration such as an earthquake as a restoring force adding means, but also attenuate the pendulum motion. Can work as a kind of damper.

  FIG. 6 is a right perspective view of another embodiment of the overturn prevention device. 7 is a left perspective view of FIG. As shown in the figure, the present embodiment further includes a deviation prevention means for preventing the installation base member from deviating from the arc-shaped rail, and has a single spring.

  That is, in the fall prevention device 70 of the present embodiment, an installation base member 71 fixed to the bottom leg portion of the box-shaped apparatus main body and an arc-shaped rail 76 that slidably supports the installation base member 71 are provided. And a rail member 75 disposed on the installation floor surface from the front surface to the rear surface.

  The installation base member 71 has an appearance in which a rectangular metal plate is bent into a concave shape with the cross section thereof being depressed in the longitudinal direction as in the above-described embodiment, and passes through the installation base member 71 at the center in the longitudinal direction on one side. The projecting pin 72 is formed to project long. Similarly, rollers 73 are disposed on the lower surfaces of both edge portions in the longitudinal direction.

  The rail member 75 has an appearance in which a portion where a metal plate bent in a concave shape is turned down is cut out in an arc shape. A portion cut out in an arc shape is an arc-shaped rail 76, and the two rollers 73 roll on the rail so that the installation base member 71 is slidable. An upper surface of the installation base member 71 is fixed to a leg portion of the arcuate device main body 10 via a mounting plate (not shown).

  Similarly to the above-described embodiment, the arc-shaped rail 76 has a height position higher than the height position of the center of gravity of the box-shaped apparatus main body 10 and the installation base member 71 as the center of the curvature radius. The installation base member 71 moves along the arc-shaped rail 76 by its own weight, performs a pendulum motion around the radius of the arc-shaped rail, and prevents the box-shaped device body from overturning.

  Two sliders 78 and 79 that are movable in the longitudinal direction along the arc-shaped rail 76 are disposed on one side of the arc-shaped rail 76 of the rail member 75. Two stopper pieces (not shown) rise at equal distances from the center in the longitudinal direction of the rail member 75 to restrict the movement of the two sliders 78 and 79. That is, one slider 78 is a front slider 78 that is in contact with the front side of the projecting pin 72 by the stopper piece and can move only forward from the steady position together with the displacement of the installation base member 71 in the front direction. Reference numeral 79 denotes a rear slider 79 which is in contact with the rear side of the projecting pin 72 and can move only from the normal position to the rear along with the rearward displacement of the installation base member 71. The front and rear sliders 78 and 79 are held in a slider groove member 61 in which the sliders 78 and 79 formed along the rail member 75 are held.

  A single spring 80 is attached to each of the sliders 78 and 79 so as to pull the sliders. The projecting pins 72, the front slider 78, the rear slider 79, and the spring 80 can not only prevent the installation base member from jumping out of the arc-shaped rail due to a vibration such as an earthquake as a restoring force adding means, but also attenuate the pendulum motion. Can work as a kind of damper.

  On the opposite side of the front and rear sliders 78 and 79 with respect to the arc-shaped rail 76, a guide piece 81 that is parallel to the arc-shaped rail 76 and that can come into contact with the side of the installation base member 71 stands on the rail member 75. ing. The guide piece 81 is provided with a guide groove 83 that penetrates a guide protrusion 82 that protrudes toward the guide piece 81 side of the installation base member 71, and the guide base 83 moves on the arc-shaped rail 76. Is formed in a shape along the arc-shaped rail 76 so as to allow the movement of.

  The front and rear ends of the guide groove 83 are provided at positions where the installation base member 71 does not jump out of the arc-shaped rail 76 due to a vibration such as an earthquake. The fall prevention device 70 provided with the guide piece 81 is arranged from the arc-shaped rail 76 by arranging at least one pair on the side of the box-like device body 10 so as to be symmetric with respect to the front of the device body 10. It is possible to prevent the member 71 from jumping out and deviating from the arc-shaped rail 76 by shifting laterally.

It is explanatory drawing which shows the structure of the vending machine equipped with the fall prevention device of this invention, a figure is a front view, and b figure is a side view. It is explanatory drawing which shows the behavior at the time of fall prevention of the fall prevention apparatus of this invention, and explanatory drawing which shows the behavior at the time of fall of the thing which is not equipped with this fall prevention device. It is explanatory drawing which shows the main structures of one Example of the fall prevention apparatus of this invention. It is explanatory drawing of the fall prevention apparatus of FIG. 3, a figure is a top view, b figure is a side view, c figure is a front view, d figure is a side view at the time of behavior. It is explanatory drawing of another Example of a fall prevention apparatus, a figure is a top view, b figure is a side view, c figure is a front view, d figure is a side view at the time of behavior. It is a right perspective view of another Example of the fall prevention device. FIG. 7 is a left perspective view of FIG. 6.

Explanation of symbols

10 ... Vending machine,
11 ... Legs,
15 ... center of gravity,
16 ... Center of curvature radius,
20 ... Fall prevention device,
30 ... Fall prevention device,
31 ... Installation base member,
32 ... projecting pin,
33 ... Laura,
34 ... Mounting plate,
35 ... Rail member,
36 ... arc-shaped rail,
37 ... stopper piece,
38 ... Previous slider,
39: Rear slider,
40 ... (front and back) spring,
41 ... holding member,
50 ... Fall prevention device,
51 ... Installation base member,
52. Projecting pin,
53 ... Laura,
54 ... Mounting plate,
55. Rail member,
56 ... arc-shaped rail,
57 ... stopper piece,
58 ... Previous slider,
59. Rear slider,
60 ... (front and back) spring,
61 ... slider groove member,
70: Fall prevention device,
71 ... Installation base member,
72 ... projecting pin,
73 ... Laura,
75 ... Rail member,
76 ... arc-shaped rail,
78 ... Previous slider,
79. Rear slider,
80 ... (front and back) spring,
81 ... guide piece,
82 ... guide protrusion,
83 ... guide groove,

Claims (4)

In the fall prevention device arranged between the box-shaped device body whose width is larger than the depth and the installation floor surface,
An installation base member fixed to the bottom of the box-shaped apparatus main body, and an arc-shaped rail that slidably supports the installation base member are arranged on the installation floor surface from the front surface to the rear surface of the box-shaped apparatus main body. In addition to the restoring force due to the weight of the arc member and the mounting base member, a restoring force adding means for restoring the mounting base member to a steady state against the displacement of the installation base member to the front and rear surfaces. Prepared,
The fall prevention device, wherein the arc-shaped rail has a center of curvature radius at a height position higher than a center-of-gravity height position between the box-shaped apparatus main body and the installation base member.   The fall prevention device according to claim 1, wherein a roller that rolls on an arc-shaped rail is disposed on the installation base member. The restoring force adding means is
A projecting pin projecting to the side of the installation table member;
A front slider that is in contact with the front side direction of the projecting pin and is movable forward only from a steady position together with a displacement in the front direction of the installation base member;
A front spring for restoring the forward displacement of the front slider to a steady position;
A rear slider that is in contact with the rear side of the projecting pin and can move only from the steady position to the rear along with the rearward displacement of the installation base member;
The fall prevention device according to claim 1, further comprising a rear spring that restores the rearward displacement of the slider to a steady position. The fall prevention device according to any one of claims 1 to 3, further comprising a departure prevention means that allows the operation of the installation base member only on the arc-shaped rail track.

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