JP5940894B2 - Fall prevention device - Google Patents

Description

  The present invention relates to a fall prevention device used for an installation in which movement in the back direction is restricted.

  Conventionally, measures to prevent falling down to the near side in the event of a shake such as an earthquake include fixing the installation to the floor or wall with earthquake-resistant metal fittings, and the top and ceiling of the installation. An installation object is fixed between the floor and the ceiling by applying an elastic rod between them to give tension. However, these methods have aesthetic problems because the fixture remains on the floor, wall, or ceiling when the installation is removed. There is a risk that the wall will be destroyed or the position of the telescopic rod will shift due to lateral shaking, and it will not be possible to maintain sufficient tension, causing the installation to fall, and safety is not perfect.

  On the other hand, as shown in Patent Document 1, it is known that the seismic isolation device absorbs shaking and prevents the installation object from falling without fixing the installation object.

JP 10-179303 A

Here, in the case of bookshelves, chests, and other installations that are installed with the back side of the wall, especially when the thickness in the front-rear direction is small relative to the width, there is almost no falling down in the left-right direction. There is no fall on the back side. On the other hand, when the installation object is tilted rearward, the center of gravity is shifted rearward, so that the installation object does not fall forward.
Therefore, in the present invention, in the installation in which movement in the back direction is regulated, the installation object is actively tilted rearward when a swing in the front-rear direction occurs without fixing the installation object on the floor or wall. Thus, an object of the present invention is to provide a fall prevention device that can prevent the installation object from falling forward.

The features of the present invention for solving the above problems will be described below.
In addition, the code | symbol in parenthesis shows the code | symbol used in embodiment of invention, and does not limit the technical scope of this invention.
(Claim 1)
(Feature point)
The invention according to claim 1 is a toppling prevention device used for an installation (shelf main body 3) whose movement in the back direction is restricted, and an upper base fixed to the lower surface of the installation (3) ( 10A) and a lower base (10B) to be installed and fixed on the installation surface (F), the upper base (10A) includes an upper front rail (20) having a rail surface (22) on the lower side and a rear side. At least a rear rotating body supporting portion (side plate 142) that rotatably supports the rotating body (50), and the lower base (10B) has an upper rail surface (32) inclined downward from the rear toward the front. At least a lower rear rail (30) and a front rotating body support (side plate 192) that rotatably supports the front rotating body (40). The upper gantry (10A) has the rear rotating body (50) mounted on the rail surface (32) of the lower rear rail (30) at the initial position where the lower gantry (10B) is installed on the installation surface (F). In the state where the rail surface (22) of the upper front rail (20) is in contact with the front rotating body (40), the fixed surface with the installation object (3) is parallel to the installation surface (F). It will be installed. When the upper base (10A) moves forward relative to the lower base (10B), the rear rotating body (50) moves the rail surface (32) of the lower rear rail (30) forward. While moving downward, the front rotating body (40) supports the rail surface (22) of the upper front rail (20) from below, and the front end of the upper base (10A) is higher than the rear end. In the lower base (10B), a movable body (protruding arm 80) that is horizontally movable in the front-rear direction is disposed in contact with or in proximity to the lower surface of the front rotating body (40). (80), the rear end side is locked to the upper gantry (10A), and as the upper gantry (10A) moves forward, the front end is forward from the front of the lower gantry (10B). is formed so as to protrude, this lower surface of the front end when the front end portion is protruded is formed so as to contact with or close proximity to the installation surface (F) The features.

(Function)
In the overturn prevention device (1) according to the present invention, the upper front rail (20), the lower rear rail (30), and the front and rear rotating bodies (40, 50) are located at positions corresponding to both ends of the bottom surface of the installation object (3). Each is preferably arranged.
In the present invention, when the installation surface (F) swings in the front-rear direction when the installation object (3) is viewed from the front, the upper platform (10B) is fixed to the installation platform (F). 10A) will move back and forth. Then, when the installation surface (F) swings backward and the upper platform (10A) moves forward relative to the lower platform (10B), the height of the rear rotating body (50) is lowered. In (10A), the front side is higher than the rear side, and the entire installation (3) to which the upper base (10A) is fixed tilts backward. On the other hand, even if the installation surface (F) swings forward and the upper platform (10A) moves backward relative to the lower platform (10B), the installation (3) with the upper platform (10A) fixed is also It moves backward, but it bounces back and moves forward to hit the wall (P) and pillar on the back. Then, as in the above, the upper base (10A) is higher on the front side than the rear side, and the entire installation (3) to which the upper base (10A) is fixed tilts backward. That is, the installation object (3) does not tilt forward even if it tilts backward, and as a result, does not fall forward.
Further, according to the present invention, since the movable body (80) protrudes as the upper base (10A) moves forward, the depth of the lower base (10B) that supports the upper base (10A) and the installation object (3). Will substantially extend. For this reason, even when the center of gravity of the installation object (3) is on the upper side, the stable state of the undercarriage (10B) can be maintained, and it becomes possible to cope with a wide range of long-term and short-period ground vibrations. . In addition, it is not necessary to unnecessarily increase the depth dimension in the front-rear direction of the undercarriage (10B), and the installation space can be reduced. Further, by arranging the moving body (80) below the front rotating body (40), the reaction force of the force applied to the moving body (80) when the installation object (3) is about to fall forward is reduced. Since the rotating body (40) receives, there is no need to provide another member for preventing the moving body (80) from floating upward from the undercarriage (10B), and the overall apparatus can be reduced in weight and cost. it can.

(Claim 2)
(Feature point)
The invention according to claim 2 is characterized in that, in addition to the features of the invention according to claim 1, the upper base (10A) is moved at least upward in the center portion in the front-rear direction of the lower base (10B). A movement restricting means (center pin 60) for restriction is provided.
(Function)
The movement restricting means (60) may be capable of restricting the movement of the upper base (10A) in the front-rear direction.

According to the present invention, the movement restricting means (60) serves as a fulcrum, and the height of the central portion in the front-rear direction of the upper base (10A) is kept constant, so that the upper base (10A) can be smoothly rotated. The upper base (10A) will not bounce. As a result, the installation object (3) can be reliably tilted backward .

(Claim 3 )
(Feature point)
The invention according to claim 3 is characterized in that, in addition to the features of the invention according to claim 1 or 2 , the lower rear rail (30) includes the upper frame (10A) in the initial position. The forward rotation of the rear rotating body (50) is restricted, and when the force in the direction of moving forward acts on the installation object (3), the backward rotating body (50) can be moved forward. A stopper (trigger protrusion 36) is provided.
(Function)
According to the present invention, when the installation object (3) does not fall forward, it is blocked by the stopper (36) and the upper base (10A) does not move forward, but the installation object (3) falls forward. In this case, for example, the rear rotating body (50) gets over the stopper (36), and the upper base (10A) can move forward. For this reason, the fall prevention device (1) is not operated by a weak vibration that does not cause the installation object (3) to fall.

  Since the present invention is configured as described above, in the installation in which movement in the back direction is restricted, the installation is not performed when the installation is fixed to the floor or the wall and the shaking in the front-rear direction occurs. By actively tilting the object backward, it is possible to provide an overturn prevention device that can prevent the installation object from falling forward.

It is embodiment of this invention, Comprising: It is a perspective view of the shelf main body as an installation thing. It is an external appearance perspective view of a fall prevention device. It is a disassembled perspective view of a fall prevention device. It is a partial expansion perspective view of an upper stand. It is a partial expansion perspective view of an undercarriage. It is a perspective view of an upper front rail. It is a perspective view of a lower back rail. It is a perspective view of a protrusion arm. It is a side view which shows the position movement of a fall prevention apparatus. It is a side view which shows the position movement of a fall prevention apparatus. It is a side view which shows the installation state of a shelf main body. It is a side view which shows the other installation state of a shelf main body. It is a modification of embodiment of this invention, Comprising: It is a bottom perspective view of a fall prevention device.

Preferred embodiments of the present invention will be described with reference to the drawings.
(Shelf body 3)
The shelf main body 3 as an installation in the present embodiment is, for example, a steel book shelf or a display shelf. As shown in FIG. 1, the left and right side plates 3A, the bottom plate 3B, the top plate 3D, and the side plates 3A It has a plurality of shelf boards 3C supported at both ends. And the fall prevention device 1 is being fixed to the baseplate 3B. In the present embodiment, unless otherwise specified, the direction of each component member in the vertical and horizontal directions and the front and rear (front and rear) directions is the component member when the shelf body 3 to which the fall prevention device 1 is fixed is viewed from the front. The direction of

(Fall prevention device 1)
As shown in FIG. 2, the overturn prevention device 1 has a rectangular frame shape as a whole. As shown in FIG. 3, the fall prevention device 1 is roughly divided into an upper frame 10A, a lower frame 10B, and two rail units 10B. It is comprised from the front roller 40 and the back roller 50 as a rotary body arrange | positioned between. FIG. 3 is a perspective view of the upper gantry 10A as viewed from below and the lower gantry 10B as viewed from above.
(Upper stand 10A)
As shown in FIG. 3, the upper base 10A includes a support frame 11 having a rectangular thin frame shape. The support frame 11 includes a front plate 12 located on the front side, a rear frame 13 parallel to the front plate 12, and left and right side frames 14 connecting the end portions of the front plate 12 and the rear frame 13, and each side frame. Below 14, an upper front rail 20 and a rear roller 50 as a rear rotating body are provided. A fixing plate 15 is provided between the front plate 12 and the rear frame 13 on the inner side of the side frame 14 (center side of the upper base 10A).

As shown in FIG. 4, the side frame 14 includes a horizontal plate 141, two side plates 142 that hang from both side ends of the horizontal plate 141, and a back plate 144 that blocks between the rear ends of the two side plates 142. It is a frame material long in the front-rear direction having (see FIG. 9). The upper front rail 20 is fixed to the front lower surface of the horizontal plate 141. The rear roller 50 is attached to the rear end of the side frame 14 via a roller shaft 51 that passes through the two side plates 142. That is, the side plate 142 functions as a rear rotating body support portion. Further, a substantially rectangular opening 143 penetrating in the left-right direction is formed from the substantially central portion in the front-rear direction of the side plate 142 toward the rear side (see FIG. 9).
The fixing plate 15 is for fixing the shelf body 3 to the upper surface thereof. When the upper base 10A is fixed to the shelf main body 3, the bottom base 3B of the shelf main body 3 and the upper surface of the fixing plate 15 are joined together with bolts from the upper side (the base plate 3B side).

(Understand 10B)
As shown in FIG. 3, the lower base 10B includes a support frame 16 having a rectangular thin frame shape. The support frame 16 includes a front frame 17 located on the front side, a rear frame 18 parallel to the front frame 17, and left and right side frames 19 connecting the front plate 17 and the end portions of the rear frame 18, and each side frame. On the upper side of 19, a lower rear rail 30 and a front roller 40 as a front rotating body are provided.
As shown in FIG. 5, the side frame 19 includes a horizontal plate 191, two side plates 192 that rise from both side ends of the horizontal plate 191, and a back plate 193 that blocks between the rear ends of the two side plates 192. It is a frame material long in the front-rear direction. The lower rear rail 30 is fixed to the upper rear surface of the horizontal plate 191. The front roller 40 is attached to the front end of the side frame 19 via a roller shaft 41 that passes through the two side plates 192. That is, the side plate 192 functions as a front rotating body support portion. Further, a center pin 60 parallel to the roller shaft 41 is attached through the two side plates 192 at a substantially central portion in the front-rear direction of the side plates 192. The center pin 60 is a movement restricting means for restricting the upward movement of the upper base 10A and the maximum moving distance in the rearward direction. Further, on the front upper surface of the horizontal plate 191, as a moving body for preventing the rear part of the lower base 10 </ b> B from being lifted by the weight of the shelf main body 3 placed when the upper base 10 </ b> A moves forward. A projecting arm 80 and a guide piece 90 (see FIGS. 8 and 9) for supporting the projecting arm 80 and guiding movement in the front-rear direction are provided. A spacer 70 formed of an elastic member such as silicon rubber is provided on the front surface of the back plate 192.

When the upper base 10A is overlapped with the lower base 10B, the side frame 14 of the upper base 10A is completely fitted between the side plates 192 of the side frame 19 of the lower base 10B, and the center pin 60 is fitted to the side frame of the upper base 10A. The opening portion 143 of 14 is penetrated, and the procedure for combining the lower base 10B and the upper base 10A will be described later.
(Upper front rail 20)
As shown in FIGS. 6 and 9, the upper front rail 20 has a substantially rectangular parallelepiped shape that is long in the front-rear direction, and the lower surface when it is fixed to the horizontal plate 141 of the side frame 14 becomes the rail surface 22. ing. The rail surface 22 is formed so that the flat portion 23 parallel to the horizontal plate 141 and the distance (vertical length) from the horizontal plate 141 gradually increase from the flat portion 23 toward the rear end portion. A curved portion 24 is provided.

Further, a tongue piece 25 is formed at the rear end of the upper front rail 20 so as to hang downward. The tongue piece 25 is engaged with a projecting arm 80, which will be described later, so that the upper base 10A and the projecting arm 80 can be moved integrally.
(Lower rear rail 30)
As shown in FIGS. 7A and 9, the lower rear rail 30 has a substantially wedge shape when viewed from the side, and the upper surface when it is fixed to the horizontal plate 191 of the side frame 19 becomes the rail surface 32. Yes. The rail surface 32 includes a flat portion 33 provided on the rear side, and an inclined portion 34 formed to be inclined downward from the flat portion 33 toward the front. The inclination angle of the inclined portion 34 is preferably about 12 to 13 degrees. Further, on the lower rear rail 30, plate-like bearing ribs 35 that protrude upward from the rail surface 32 and have an upper surface parallel to the rail surface are formed over the length direction. That is, the bearing rib 35 also has a flat portion 35A and an inclined portion 35B. Further, the bearing rib 35 has a front flat portion 35C that extends further forward from the front end portion of the inclined portion 35B. The upper surface of the front flat portion 35C is formed in parallel with the horizontal plate 191 of the side frame 19. The roller shaft 51 of the rear roller 50 can be brought into contact with the bearing rib 35 while the rear roller 50 is in contact with the rail surface of the rail surface 32 or the horizontal plate 191 of the side frame 19.

  Further, a trigger projection 36 having a substantially triangular shape in a side view protruding upward is formed on the upper surface of the bearing rib 35 and on the front end portion of the flat portion 35A. The trigger protrusion 36 is a stopper protrusion for restricting the forward movement of the rear roller 50. When viewed from the side, the trigger protrusion 36 is a top portion 36A parallel to the flat portion 33 of the rail surface 32 as shown in FIG. A curved portion 36B provided on the rear side of the top portion 36A, and an inclined portion 36C provided on the front side of the top portion 36A and parallel to the inclined portion 34 of the rail surface 32. The curvature radius of the curved portion 36B is equal to the radius of the roller shaft 51 of the rear roller 50, and the forward movement of the upper base 10A is locked when the roller shaft 51 abuts on the curved portion 36B. However, when a certain amount of force is applied to the upper base 10A from the rear, the roller shaft 51 gets over the top 36A and the locked state is released.

(Projecting arm 80)
As shown in FIG. 5, the projecting arm 80 is a long frame member arranged in the front side of the side frame 19 of the undercarriage 10B so that the length direction is the front-rear direction. The upper plate 81, two side plates 82 depending from both side end portions of the upper plate 81, and a roller 85 that is fixed between the side plates 82 are provided. The roller 85 is provided at the front end of the side plate 82. Further, an opening 83 that opens upward is formed near the rear end of the upper plate 81. The tongue 83 of the upper front rail 20 can be inserted into the opening 83 in a state where the upper platform 10A and the lower platform 10B are overlapped, and the tongue 25 is locked. When the tongue piece 25 is locked to the opening 83, the projecting arm 80 can move integrally with the upper base 10A. The side plate 82 is provided with two overhanging pins 84 extending sideways in the front-rear direction. The overhang pin 84 is inserted into a guide groove 91 of a guide piece 90 described below.

Further, as shown in FIG. 9, the protruding arm 80 is formed at a height at which the front roller 40 comes into contact with the upper surface of the upper plate 81. That is, the front roller 40 presses the upper plate 81 of the protruding arm 80 from above, and prevents the protruding arm 80 from floating upward.
(Guide piece 90)
As shown in FIGS. 8 and 9, the guide piece 90 is an upright piece provided on the upper surface of the horizontal plate 191 of the side frame 19 of the undercarriage 10 </ b> B and outside the protruding arm 80. The guide piece 90 may be formed by bending a part of the horizontal plate 191 upward, or may be formed by fixing another member to the horizontal plate 191. The guide piece 90 is provided with a long hole-shaped guide groove 91 formed in the front-rear direction. The guide groove 91 is engageable with the overhanging pin 84 of the protruding arm 80, supports the protruding arm 80 inside the side frame 19, prevents the protruding arm 80 from floating upward, and moves in the front-rear direction. It is a guide.

The guide piece 90 may be provided with a guide pin, and the protruding arm 80 may be provided with a groove portion with which the guide pin can be engaged.
(Operation of the fall prevention device 1)
Next, the movement of the overturn prevention device 1 having the above configuration will be described with reference to FIGS. 9 and 10.
FIG. 9A shows the initial position of the overturn prevention device 1. In the initial position, the support frame 11 of the upper frame 10A and the support frame 16 of the lower frame 10B overlap each other. Specifically, the side frame 14 of the upper frame 10A is positioned between the side plates 192 of the side frame 19 of the lower frame 10B (see FIG. 2), and the rear plate 144 of the side frame 14 is in contact with the spacer 70. The front plate 12 of the upper base 10A covers the front side of the support frame 16 of the lower base 10B (see FIG. 2). Further, the front roller 40 is sandwiched between the front end portion of the rail surface 22 of the upper front rail 20 and the vicinity of the front end portion of the upper plate 81 of the protruding arm 80. The upper front rail 20 is supported from below by the front roller 40. Has been. The rear roller 50 is located on the flat portion 33 at the rear end of the rail surface 32 of the lower rear rail 30, and the roller shaft 51 of the rear roller 50 is behind the trigger projection 36 provided on the bearing rib 35. Abut. In this state, the upper base 10A is in a horizontal state. Further, the roller 85 of the projecting arm 80 is in a position projecting slightly to the front side from the front end portion of the side frame 19, and the overhang pin 84 is located on the rear side of the guide groove 91. Further, the center pin 60 is located in the most forward vicinity of the opening 143 of the side frame 14 of the upper base 10A.

  Next, it is assumed that a force in the forward direction (left direction in FIG. 9) is applied to the upper base 10A when the upper base 10A is in the initial position. When the force is weak, since the roller shaft 51 of the rear roller 50 is locked to the trigger protrusion 36, the upper base 10A does not move. However, when the force applied to the upper base 10A exceeds the locking force of the trigger protrusion 36, as shown in FIGS. 9B and 9C, the roller shaft 51 gets over the trigger protrusion 36 and the rear roller 50 moves to the rail surface. Move to 32 ramps 34. As the rear roller 50 rolls on the inclined portion 34, the upper frame 10A moves forward relative to the lower frame 10B, and the upper front rail 20 moves forward while being supported by the front roller 40. Accordingly, the projecting arm 80 also moves forward while being guided by the guide piece 90. Then, with the movement of the upper base 10A, the relative position of the center pin 60 with respect to the opening 143 moves to the rear side of the opening 143.

Even if the upper base 10A is moved rearward, the spacer 70 abuts against the back plate 144 of the side frame 14 to be prevented from moving, and the upper base 10A cannot be moved further rearward. However, since the upper base 10A is only supported by the lower base 10B by the front roller 40 and the rear roller 50, when a force that moves the upper base 10A rearward is applied, the reaction moves back in the reverse direction. It has become a thing.
FIG. 10A shows a state where the upper base 10 </ b> A has moved to a position where the rear roller 50 has moved down the inclined portion 34 of the lower rear rail 30. In this state, the rear roller 50 is positioned on the upper surface of the horizontal plate 191 of the side frame 19 of the undercarriage 10B, that is, a position lower than the initial position, but the front rail 40 is a protruding arm 80 that maintains the horizontal state. The height position does not change. For this reason, the upper base 10A is in a state in which the front end portion is rotated upward from the initial position. That is, the upper surface of the upper base 10A is inclined downward toward the rear. At this time, the relative position of the center pin 60 with respect to the opening 143 is about 1/3 of the rear side of the opening 143.

  FIG. 10B shows a state in which the upper base 10A has moved forward until the center pin 60 comes into contact with the rear edge 143a of the opening 143. Since the center pin 60 locks the rear end edge 143a of the opening 143, the upper base 10A cannot move further forward. That is, FIG. 10B shows a state where the upper base 10A has moved forward as much as possible. In this state, the protruding arm 80 protrudes to a position where the overhanging pin 84 positioned in the front is in the vicinity of the front end portion of the guide groove 91 of the guide piece 90, and the front roller 20 is the tongue piece 25 of the upper front rail 20. It is located in front of. Here, although the height positions of the front roller 40 and the rear roller 50 are not changed from those shown in FIG. 10A, an end point bending portion 24 is formed on the rear side of the upper front rail 20. Since the rear side is thicker, as the upper front rail 20 moves on the front roller 20 as the upper base 10A moves forward, the inclination angle of the upper base 10A increases.

Here, the shape of the lower edge portion 143b of the opening 143 is such that when the upper frame 10A is in the initial position, the front end portion where the center pin 60 is located is parallel to the upper surface of the upper frame 10A, and from there The front end is formed in a special shape that is again parallel to the upper surface of the upper base 10A. With this shape, even if the inclination angle of the side frame 14 changes as the upper base 10A advances, the center pin 60 always abuts against the lower edge 143b of the opening 143 without preventing the movement of the upper base 10A. Is possible.
The upper base 10A that has moved forward as much as possible has the rear roller 50 inclined portion 34 of the lower rear rail 30.
And the roller shaft 51 can be returned to the initial position by pressing backward with a force capable of getting over the trigger protrusion 36.

(Installation of the fall prevention device 1 and installation of the shelf body 3)
A procedure for attaching the fall prevention operation 1 to the shelf body 3 will be described. First, the undercarriage 10B is installed and fixed on an installation surface such as a floor so that the protruding arm 80 is on the front side of the shelf body 3. Further, the bottom plate 3B of the shelf body 3 is fixed to the fixing plate 15 of the upper base 10A. And the shelf main body 3 which fixed the upper mount base 10A is installed on the lower mount base 10B. At this time, the center pin 60 is removed from the lower base 10B, the side frame 14 of the upper base 10A is inserted between the side plates 192 of the side frame 19 of the lower base 10B, and the tongue piece 25 of the upper front rail 20 protrudes. The upper base 10A and the lower base 10B are combined while being inserted into the opening 83 of the arm 80. When the upper base 10A is slid to the rearmost part, the roller shaft 51 of the rear roller 50 is positioned at the rear side of the trigger projection 36 of the lower rear rail 30 as shown in FIG. 9A. Then, the center pin 60 is inserted from the outside of the side frame 19 of the lower base 10B and fixed with an E ring or the like. Note that a protective material such as rubber having a substantially L-shaped cross section may be attached to the rear side upper end portion of the shelf body 3, for example, the rear side corner portion of the top plate 3D. The protective material may be provided over the upper rear edge of the top plate 3D.

Next, an installation example of the shelf body 3 on which the fall prevention device 1 is mounted as described above will be described.
First, FIG. 11A shows a case where the back surface of the shelf body 3 is installed along a wall surface P (which may be a pillar) perpendicular to the horizontal installation surface F. FIG. 11 is a side view of the shelf body 3. Here, in the illustrated example, the back surface of the undercarriage 10B is arranged in close contact with the wall surface P. However, when the height of the shelf body 3 is higher than that illustrated, the undercarriage 10B is attached to the wall surface P. And fix with a predetermined gap between them. The gap is set to a dimension such that the protective material of the shelf body 3 tilted rearward does not contact the wall surface P before the upper base 10A moves forward as much as possible. That is, a gap is provided so that the shelf main body 3 tilted rearward does not interfere with the wall surface P and move to the maximum protruding length of the upper base 10A.

FIG. 12 shows a case where the plurality of shelf bodies 3 and 3 ′ are installed on the installation surface F with the back surfaces aligned. Also in this case, when the height of the shelf body 3 is higher than that shown in the figure, a predetermined gap should be provided between the back surface of one lower base 10B and the back surface of the other lower base 10B. become. In this case, the gap is set to a size larger than that when the shelf body 3 is arranged on the wall surface P.
Then, the movement at the time of the occurrence of an earthquake of the shelf body 3 on which the fall prevention device 1 according to the present embodiment is mounted will be described with reference to FIG.
When the shelf body 3 is shaken in the front-rear direction, the installation surface F moves forward (in the direction of the black arrow in FIG. A force that falls in the direction of the white arrow) works, and conversely, when the installation surface F moves backward relative to the shelf body 3, a force that falls forward is exerted on the upper part. When a force that causes the upper portion of the shelf main body 3 to fall backward acts, a force that moves forward acts on the lower portion of the shelf main body 3, and the roller shaft 51 of the rear roller 50 moves the trigger protrusion 36 of the lower rear rail 30. (See FIG. 9B), the upper base 10A moves forward relative to the lower base 10B. Then, as described above, the shelf body 3 is tilted backward (see FIG. 11B), but the wall surface P is on the back surface, so that the shelf body 3 does not fall down.

On the other hand, when a force that causes the upper part of the shelf body 3 to fall forward acts, a force that moves backward acts on the lower part of the shelf body 3, but as described above, the upper base 10 </ b> A is less than the lower base 10 </ b> B. Since it does not move backward, it moves forward by reaction. In this case as well, the shelf body 3 tilts backward, but does not fall backward.
In this way, the overturn prevention device 1 can prevent the shelf body 3 from falling to the front side by tilting to the rear side even when the shelf body 3 swings in any direction.
The above also applies to the installation example shown in FIG. In the case of the installation example of FIG. 12, the shelf main bodies 3 and 3 ′ arranged on the back side are both arranged when the installation surface F moves in the black arrow direction and also in the white arrow direction. , It will be tilted backwards with a slight time difference. For example, when the installation surface F moves in the direction of the black arrow, a force that falls backward acts on the upper portion of the shelf body 3 located on the left side, and the upper base 10A starts moving immediately after. On the other hand, a force that falls forward is exerted on the upper portion of the shelf body 3 'located on the right side, but due to the reaction, the upper frame 10A has a slight time lag after the upper frame 10A of the shelf body 3 starts moving. Then start moving.

(Summary)
As described above, according to the present embodiment, the front lower portion of the shelf body 3 is moved forward by the sliding movement of the upper base 10A to the front, and simultaneously lifted upward, so that the shelf body 3 is tilted rearward. be able to. Since the upper base 10A does not move backward with respect to the lower base 10B, the shelf main body 3 is inclined rearward regardless of which direction the installation surface F swings in the front-rear direction of the shelf main body 3. It will not fall forward. Therefore, safety in the event of an earthquake can be ensured.
Further, since the projecting arm 80 is provided as a moving body projecting forward in synchronization with the upper base 10A, it is possible to prevent the shelf body 3 from falling to the near side. That is, the projecting arm 80 substantially extends the front and rear length of the base 10B. For example, when the height of the shelf body 3 is high or when a heavy object is placed on the top of the shelf, the center of gravity of the shelf body 3 is raised. Even in this case, it is possible to absorb the upward force applied to the rear end side of the lower base 10B, prevent the rear end of the lower base 10B from being lifted, and maintain a stable state. Thereby, it is possible to cope with a wide range of ground vibrations having a long period and a short period. In addition, it is not necessary to unnecessarily increase the depth dimension in the front-rear direction of the undercarriage 10B, and the installation space can be reduced.

In addition, the fall prevention device 1 according to the present embodiment is configured such that when the shelf body 3 fixed to the upper base 10A receives a force in the front-rear direction, the roller base 51 moves over the trigger projection 36 and the upper base 10A moves forward. In other words, when the shelf body 3 is about to fall forward due to shaking, the upper base 10A moves forward. For this reason, the shelf main body 3 does not fall backward due to weak shaking, and unnecessary current restoration work need not be performed.
Further, a center pin 60 is provided at a substantially central portion in the front-rear direction of the lower platform 10B, and an opening 143 having a lower edge portion 143b formed in a specific shape is provided in the side frame 14 of the upper platform 10A. Then, the center pin 60 always presses the lower edge 143b of the opening 143 of the upper base 10A from above, and this serves as a fulcrum, thereby rotating the upper base 10A (the rear roller 50 causes the inclined portion 34 to be inclined downward). Ascending the front end of the upper base 10A associated with rolling) is performed smoothly. Further, even when vertical shaking due to an earthquake occurs, the upper base 10A does not bounce on the lower base 10B and the shelf body 3 does not fall forward.

  Further, the projecting arm 80 is disposed below the front roller 40, and the front roller 40 receives the reaction force applied to the projecting arm 80 when the shelf body 3 is about to fall forward. 80 will not float up. Here, the projecting arm 80 can be disposed, for example, adjacent to the side frame 190. However, when formed in this way, a member for installing the projecting arm 80 and receiving the reaction force applied to the projecting arm 80. (For example, a cylinder that houses the protruding arm 80) must be provided separately. However, in the present embodiment, it is not necessary to provide such other members, and the internal space of the side frame 190 can be effectively used to reduce the weight and cost of the entire apparatus.

In the present embodiment, the tongue 83 provided on the opening 83 and the upper front rail 20 is used as means for locking the protruding arm 80 to the upper base 10A, but the upper base 10A is tilted backward. Any manner of locking means may be provided as long as it allows the protruding arm 80 to move horizontally forward as it moves forward.
In this embodiment, the roller shaft 51 of the rear roller 50 is locked by the trigger protrusion 36 at the initial position. However, the trigger protrusion is provided on the rail surface, and the rear roller 50 is engaged. It is good also as a structure stopped.
(Modification)
FIG. 13 is a bottom perspective view of the overturn prevention device 1, showing a modification of the present embodiment and omitting the intermediate portion. Note that the description of the front frame 17 and the right side frame 19 of the undercarriage 10B is omitted.

  In the above-described embodiment, the end point bending portion 24 is formed behind the upper front rail 20, but the curvature of the end point bending portion 24 may be infinite. That is, the rail surface 22 of the upper front rail 20 may be formed in parallel with the horizontal plate 141 of the side frame 14. Specifically, as shown in FIG. 13, the side plate 142 of the side frame 14 is provided with a notch 144 parallel to the horizontal plate 141, the notch 144 is used as the upper front rail 20, and the roller shaft 41 of the front roller 40 is You may form so that the upper front rail 20 may be contact | abutted. Alternatively, the front roller 40 may be formed so as to contact the bottom surface of the horizontal plate 141, and the bottom surface of the horizontal plate 141 may be used as the upper front rail 20. In this case, means for locking the protruding arm 80 to the upper base 10A is provided on the side frame 14. Specifically, as shown in FIG. 13, a tongue piece 145 that protrudes inward from the outer side plate 142 of the side frame 14 is provided, and the protruding arm 80 has a slit that can be engaged with the tongue piece 145. Form 86. Even if it is formed as described above, it is possible to obtain the same effects as those of the above-described embodiment.

  Furthermore, in this modification, a height adjustment mechanism 100 is provided on the bottom surface of the undercarriage 10B. In FIG. 13, the description of the right-side height adjustment mechanism 100 is omitted, but the height adjustment mechanism 100 is provided on both the left and right sides of the fall prevention device 1 so as to be positioned below the fixed plate 15. In the height adjusting mechanism 100, adjuster bolts 120 each having a disc-like foot portion at the bottom are attached to the front and rear end portions of the support plate 110 fixed to the undercarriage 10B. By providing the height adjusting mechanism 100, the installed object is not distorted even when a heavy object is mounted, and for example, it is possible to prevent a trouble that the door cannot be opened in a library with a door. In the embodiment described above, it is desirable to provide a height adjustment mechanism 100 as shown in FIG.

  The present invention can also be used for furniture such as a chiffon and mechanical devices such as a vending machine in addition to a bookcase and a display shelf.

1 Fall prevention device 3 Shelf body (installed object)
3A Side plate 3B Bottom plate
3C shelf board 3D top board
10A Upper base 10B Lower base
11 Support frame 12 Front plate
13 Rear frame 14 Side frame
141 Horizontal plate 142 Side plate (rear rotating body support)
143 Opening 144 Back plate
15 Fixing plate 16 Support frame
17 Front frame 18 Rear frame
19 Side frame 191 Horizontal plate
192 Side plate (front rotating body support) 193 Back plate
20 Upper front rail 22 Rail surface
23 Flat part 24 End curve part
25 Tongue pieces
30 Lower rear rail 32 Rail surface
33 Flat part 34 Inclined part
35 Bearing rib 36 Trigger protrusion (stopper)
40 Front roller 50 Back roller
60 Center pin (movement restriction means) 70 Spacer
80 Projecting arm (moving body) 81 Upper plate
82 Side plate 83 Opening
84 Overhang pin 85 Roller
90 Guide member 91 Guide groove F Installation surface P Wall surface

Claims (3)

A fall prevention device used for installations whose movement in the back direction is restricted,
An upper base fixed to the lower surface of the installation, and a lower base fixed to the installation surface;
The upper frame includes at least an upper front rail having a rail surface on the lower side, and a rear rotating body support portion that rotatably supports the rear rotating body,
The lower pedestal includes at least a lower rear rail having a rail surface inclined downward from the rear toward the front, and a front rotating body support portion that rotatably supports the front rotating body,
The upper gantry has the rear rotating body placed on the rail surface of the lower rear rail at an initial position where the lower gantry is installed on the installation surface, and the rail surface of the upper front rail contacts the front rotating body. In such a state, the fixed surface with the installation object is installed in parallel with the installation surface,
When the upper frame moves forward with respect to the lower frame, the rear rotating body moves downward on the rail surface of the lower rear rail, and the front rotating body moves to the rail surface of the upper front rail. Is formed such that the front end of the upper base is higher than the rear end ,
In the undercarriage, a moving body that is horizontally movable in the front-rear direction is disposed in contact with or in proximity to the lower surface of the front rotating body,
The movable body is configured such that the rear end side is locked to the upper frame, and the front end projects forward from the front of the lower frame as the upper frame moves forward, A fall prevention device, wherein the front end portion is formed such that the lower surface of the front end portion is in contact with or very close to the installation surface .   The fall prevention device according to claim 1, wherein a movement restricting means for restricting at least upward movement of the upper pedestal is provided at a central portion in the front-rear direction of the lower pedestal. The lower rear rail restricts the forward movement of the rear rotating body when the upper platform is in the initial position, and the rearward when the force in the direction of moving forward is applied to the installation object. overturning prevention device according to claim 1 or 2, characterized in that the stopper to allow forward movement of the rotating body is provided.

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