JP2003052473A - Device for preventing fall of book - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for preventing fall of a book which prevents the books from falling by an earthquake without deteriorating convenience for putting-in/taking-out the books and also prevents a bookshelf itself from falling down. SOLUTION: The device 1 for preventing fall of a book is provided with an earthquake operation mechanism 10 which is constituted to permit a weight 14 consisting of a magnet to be mechanically balanced in a first system with a rocking element 13 to be rocked by a vibration, a slide mechanism 30 which is constituted to release the mechanical balance in a second system with a slider 37 by collision with the weight 14 so as to move the slider 37 and also a fall preventing member 51 which is movable between a pair of guide rails and arranged at a position where the member 51 blocks a book putting-in/ taking-out part in the bookshelf 5 interlocked with the slider 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing a book from falling from a bookshelf in the event of an earthquake.

[0002]

2. Description of the Related Art Generally, a large bookshelf including a plurality of shelves is installed in a library or a library in a school, and books are often displayed at a position higher than the height of a user (especially a child). . Therefore, in the event of an earthquake, if the bookshelf sways and the book falls, the book may injure the user. Conventionally, in order to prevent a book from falling due to an earthquake, for example, a method is used in which the books are tied to a bookshelf one by one so that the books do not collide with the user even if the books fall.

[0003]

However, in such a conventional method of preventing a book from falling, there has been a problem that the string has to be attached and detached every time the book is taken in and out of the bookshelf.

Further, according to this method, in the event of an earthquake, books can be prevented from falling by being bound to the bookshelf by a string, but since the books jump out to the front side, the position of the center of gravity of the entire bookshelf is significantly moved. The bookshelf itself may fall forward.

The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to prevent a book from falling due to an earthquake without impairing the convenience of taking in and out of the book. Another object of the present invention is to provide a book fall prevention device capable of preventing the bookshelf itself from falling.

[0006]

In order to achieve the above object, the present invention according to claim 1 provides a fall prevention member movable in the vicinity of a portion for taking in and out of books on a predetermined bookshelf, and a mechanical balance. By having a plurality of mechanical systems that can be chained to each other and a mechanical unbalance based on vibration applied to one mechanical system propagates in a chain to another mechanical system,
A fall prevention device for a book, wherein the fall prevention member is arranged at a position that blocks a portion where the book is taken in and out.

According to the first aspect of the invention, when the mechanical balance of a mechanical system is disrupted by an earthquake,
As the mechanical unbalance propagates to other mechanical systems one after another, the fall prevention member is moved to a position where it blocks the part where the books are taken in and out of the bookshelf. Without restraint, that is,
It is possible to prevent books from falling due to an earthquake without impairing the convenience of taking in and out of books.

According to the first aspect of the present invention, the book and the bookshelf are not restrained, and the books are prevented from falling, so that the position of the center of gravity of the whole bookshelf can be significantly increased even if the bookshelf is shaken by an earthquake. Since it does not move, the bookshelf itself can be prevented from falling.

As in the invention described in claim 2, in the invention described in claim 1, the weight placed on the mechanical balance of the first system is vibrated, so that the mechanical balance of the first system is changed. The seismic actuation mechanism that is configured to collapse and drop, and the slider that is placed in the mechanical balance of the second system so that the mechanical balance of the second system collapses due to the drop of the weight and moves by a predetermined amount. It is also effective that the fall prevention member is configured to interlock with the slider.

According to the second aspect of the present invention, a mechanical balance is maintained between the slider and the fall prevention member, and the balance is broken by the drop of the weight to prevent the fall prevention member from generating an earthquake. Can be operated together.

According to a third aspect of the present invention, in the second aspect of the present invention, the seismic actuation mechanism includes a dynamics of the first system between the weight composed of the magnet and the oscillator in which the weight can swing by vibration. It is also effective to be configured to be balanced.

According to the third aspect of the invention, it is easy to apply vibration due to an earthquake with the weight maintaining a delicate mechanical balance between the weight and the oscillator with respect to the magnetic force of the weight itself and its own weight. It is possible to obtain the first mechanism system capable of breaking the mechanical balance.

According to a fourth aspect of the invention, in the third aspect of the invention, the slide mechanism releases the mechanical balance of the second system with respect to the slider by collision with the weight, and the slider is prevented from falling. It is also effective to be configured to move by the own weight of the.

According to the fourth aspect of the invention, the mechanical balance can be easily broken by colliding with the weight while the slider maintains the mechanical balance with the fall prevention member. A second mechanical system can be obtained.

According to the invention of claim 5, claims 2 to
In the invention described in any one of 4 above, it is also effective that the fall prevention members are configured to be movable between the pair of guide rails while being connected to each other.

According to the fifth aspect of the present invention, the fall prevention member can be integrally disposed at a position that blocks the portion of the bookshelf where the books are taken in and out as the slider moves.

According to a sixth aspect of the present invention, in the second aspect of the present invention, the seismic actuation mechanism is such that the weight composed of a sphere is connected to one end of the string-shaped member via the pulley on the tray. It is also effective to be configured so as to be in the mechanical balance of the first system.

According to the sixth aspect of the invention, the mechanical balance is easily maintained by the vibration applied by the earthquake while the weight maintains a delicate mechanical balance based on the shape of the weight itself on the pan. It is possible to further obtain the first mechanical system that can be broken.

According to the invention described in claim 7, in the invention described in claim 6, in the slide mechanism, the mechanical balance of the second system with respect to the slider is released by pulling the string-like member due to the drop of the weight. Therefore, it is also effective that the slider is configured to move by a predetermined biasing force.

According to the invention described in claim 7, the slider maintains the mechanical balance between the predetermined urging force and the other end of the string-like member connected to the weight through the pulley. ,
Second, a mechanical system can be further obtained which can break the mechanical balance more easily than the pulling of the string-like member due to the drop of the weight.

[0021] Like the invention described in claim 8, in the invention described in claim 7, the fall prevention members are independent from each other and are locked by a locking member connected to the slider between the pair of guide rails. On the other hand, it is also effective that the slider is configured to drop due to unlocking by the locking member as the slider moves.

According to the eighth aspect of the present invention, with the movement of the slider, the fall prevention members can be arranged independently of each other at a position that blocks the portion of the bookshelf where the books are taken in and out.

According to the invention described in claim 9, claims 1 to
In the invention described in any one of 8 above, it is also effective that the fall prevention member is a stretchable rod member.

According to the invention described in claim 9, it is possible to deal with bookshelves having various widths.

According to the invention of claim 10, claim 1
In the invention described in any one of 1 to 8, it is also effective that the fall prevention member is a string-shaped member that can be wound up.

According to the tenth aspect of the invention, in addition to being able to accommodate bookshelves having various widths, the weight of the fall prevention member can be reduced.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a book fall prevention device according to the present invention (hereinafter simply referred to as "fall prevention device") will be described in detail with reference to the drawings. Figure 1
[FIG. 3] is a front view showing a schematic configuration of a fall prevention device of the present embodiment. FIG. 2 is a right side view showing a schematic configuration of the fall prevention device. FIG. 3 is a plan view showing a schematic configuration of the fall prevention device.

As shown in FIGS. 1 to 3, the fall prevention device 1 of the present embodiment is mounted on a bookshelf 5 of a predetermined size, and has an earthquake actuation mechanism 10, a slide mechanism 30, and a guard bar. The guard mechanism 50 includes a (fall prevention member) 51. Here, the bookshelf 5 used in the present embodiment
Is configured such that an inner space portion is partitioned by a plurality of shelves 5b with respect to an outer shape formed with dimensions of height H, width W, and depth L.

As shown in FIG. 2, the seismic actuation mechanism 10 is
At the rear part on the top plate 5a of the bookshelf 5 (upper right side of FIG. 2),
It has a cylindrical case 12 fixed via a mounting member 11. The lower bottom of the case 12 is open, while the upper bottom portion of the case 12 has a circular fitting hole 12a.
The oscillating element 13 is fitted in and supported by the fitting hole 12a.

The oscillator 13 has a balance block 13a having a predetermined weight. A rod-shaped pivot shaft 13b is fixed to the balance block 13a so as to pass through the center of gravity thereof, and a swing center portion 13c is provided at a middle portion of the pivot shaft 13b.
Is attached. The swing center portion 13c is formed in a spherical shape with a diameter larger than the diameter of the fitting hole 12a of the case 12, and is in line contact with the edge portion of the fitting hole 12a so that the balance block 13a swings.

A holding portion 13d formed of, for example, iron in a spherical shape is attached to the tip of the pivot 13b, and a weight 14 made of a magnet is held in the holding portion 13d. The weight 14 is formed in a hollow cylindrical shape, and while being in line contact with the holding portion 13d of the oscillator 13, while maintaining a mechanical balance between the magnetic force generated upward at this contact portion and its own weight, It is designed to be stationary inside the case 12.

The holding portion 13d of the oscillating member 13 has the weight 14 when the balance block 13a oscillates.
From the viewpoint of facilitating separation from 3d, only the circumferential portion that comes into contact with the weight 14 may be made of iron, and the other portions may be made of a material such as resin that is not attracted to the magnet.

As shown in FIG. 2 or 3, the slide mechanism 30 is mounted on almost the entire surface of the top plate 5a of the bookshelf 5. The slide mechanism 30 is an earthquake actuation mechanism 1
It has an operating plate 31 that can contact the weight 14 of zero. The operating plate 31 is arranged at a position such that its rear end portion (a portion in contact with the weight) includes a portion directly below the weight 14, and the support shaft 32 is provided.
It is rotatably supported by the support plate 33 via. A compression coil spring 34 is attached to the rear end portion of the actuating plate 31 with the support plate 33.

As a result, the operating plate 31 is urged so that the rear end portion thereof is lifted up, but in a state in which it is substantially parallel to the support plate 33 by the detents 31a formed in the peripheral portion of the support shaft 32. It is designed to be locked. Operating plate 3
A claw-shaped release lever 35 is formed at the tip end portion of 1, and the release lever 35 and the engagement claw 36 provided on the slider 37 are configured to engage with each other.

From the viewpoint of weight reduction, the slider 37 is made of a light metal such as aluminum and formed into a thin hollow quadrangular prism. Further, as shown in FIG. 3, the slider 37 is formed to have a length slightly shorter than the width W of the bookshelf 5, and the rotary rollers 38 are attached to both ends thereof.

Such a slider 37 has a width W of the bookshelf 5.
By being guided by the pair of guide rails 40 attached via the fixing member 39 at the edge portion of the top plate 5a so as to be arranged in the direction,
It is movable in the depth L direction.

At both ends of the slider 37,
Wires 41 having a predetermined length are tied together, and the other side of these wires 41 is connected to the guard bar 5 to be described later via pulleys 42 attached to both front corners of the top plate 5a.
A plurality of 1 are attached. Then, the slider 37
Is maintained in a mechanical balance between the reaction force received from the release lever 35 by the engagement claw 36 and the tension of the wire 41 corresponding to the total weight of the guard bar 51.
It is supposed to stand still above.

On the other hand, on the top plate 5a, the slider 37
A stopper 43 capable of contacting the slider 37 is attached to a portion distant from the stationary position in the front direction of the depth L by a predetermined distance.

As shown in FIG. 1 or 2, the guard mechanism 5
Reference numeral 0 is attached to the front surface of the bookshelf 5 where the book 3 is taken in and out, and includes a plurality of guard bars 51 and a pair of guide rails 52. Each guard bar 51 has a slider 3
By adjusting the length of the wire 41 connecting between 7 and the guard bar 51, or between the guard bars 51,
It is arranged at the position of the front surface of the top plate 5a and each shelf 5b.

Each guard bar 51 has a slider 37.
Similar to the above, from the viewpoint of weight reduction, it is formed into a thin hollow quadrangular prism using a light metal such as aluminum, but in the case of the present embodiment, it corresponds to the bookshelf 5 with various widths. From the viewpoint of making it possible, it is configured to be expandable and contractable by screwing at a desired position using a plurality of square members.

Further, rotating rollers 53 are attached to both end portions of each guard bar 51. By adjusting the length of the guard bar 51, each rotating roller 53 is arranged at the position of the front surface of the side plate 5c of the bookshelf 5.

On the other hand, the guide rails 52 are attached to both front surfaces of the side plates 5c with the rotating rollers 53 of each guard bar 51 sandwiched therebetween. As a result, each guard bar 51 is movable in the height H direction along the guide rail 52 on the front surface of the bookshelf 5.

Now, on the top plate 5a, the slider 3
The distance between the stationary position of No. 7 and the stopper 43 is equal to that of the slider 37.
The guard bars 51 are defined so as to block the book entry / exit portion 5A of the bookshelf 5 in accordance with the movement.

FIG. 4 is a right side view showing the operating state of the fall prevention device of this embodiment, and FIG. 5 is a front view showing the operating state of the fall prevention device. As shown in FIG. 4, when an earthquake occurs and vibration is applied to the seismic actuation mechanism 10, the oscillator 13 shakes, so that contact between the weight 14 and the holding portion 13d of the oscillator 13 is maintained. The mechanical balance breaks down without leaning, and the weight 14 falls freely and collides with the operating plate 31.

As a result, the tip end portion of the operating plate 31 is lifted, the engagement between the release lever 35 and the engaging claw 36 of the slider 37 is released, and as a result, the mechanical balance of the slider 37 is lost, so that the slider 37 is broken. Moves horizontally until it hits the stopper 43 due to the tension generated in the wire 41 based on the total weight of the fall prevention member 51, and each guard bar 51 is arranged at a position that blocks the portion 5A for taking in and out the book on the bookshelf 5.

That is, such an actuation phenomenon is caused by the mechanical unbalance occurring in the seismic actuation mechanism 10 being successively propagated to the slider mechanism 30 and the guard mechanism 50 one after another, resulting in a drop included in the guard mechanism 50. This is based on the principle of moving the prevention member 51. And FIG.
As shown in FIG. 6, the books on the shelves 5b of the bookshelf 5 are blocked by the guard bars 51, so that the bookshelves 5 do not fall even if the bookshelf 5 itself shakes.

As described above, according to this embodiment,
Place the guard bar 51 in a position where it does not interfere with the loading and unloading of books while maintaining the mechanical balance.
When the mechanical balance is broken due to an earthquake, the guard bar 51 is arranged at a position that shields the book. Therefore, the book and the bookshelf 5 are not restricted by a string as in the prior art, that is, the book is It is possible to prevent books from falling due to an earthquake without impairing the convenience of taking in and out. Also,
According to the present embodiment, without binding the book and the bookshelf 5,
Since the books are prevented from dropping, the position of the center of gravity of the bookshelf 5 as a whole does not move significantly even if the bookshelf 5 shakes due to an earthquake, so that the bookshelf 5 itself can be prevented from falling.

FIG. 6 is a front view showing a schematic structure of a fall prevention device according to another embodiment of the present invention. As shown in FIG. 6, in the case of the present embodiment, as a fall prevention member, a guard string 51B is attached between two slide blocks 51A slidable on a pair of guide rails 52, and the guard string 51B is attached. It is different from the above-mentioned embodiment in that one side portion can be wound.

Further, in the case of the present embodiment, the wire 41 connected to the uppermost slide block 51A is directly engaged with the release lever 35 without being connected to the slider 37 as in the above-mentioned embodiment, and the earthquake occurs. The wire 41 is released from the release lever 35 by the actuating mechanism 10, and the slide block 51A is arranged at a position where it blocks the portion where the book is taken in and out by locking with the stop pin 54. .

According to this embodiment having such a structure, the guard string 51B is used for the fall prevention member 51, and the slider 37 is not used, so that the mechanism system for moving the fall prevention member 51 is lightened. This is advantageous in that the mechanical energy required for the seismic actuation mechanism 10 to operate this mechanism system can be reduced.

FIG. 7 is a right side view showing a schematic configuration of a fall prevention device according to still another embodiment of the present invention. In the case of the present embodiment, as shown in FIG.
Is configured such that the weight 14A formed of a spherical body has a predetermined height and is kept mechanically balanced on the saucer 15 having a concave curved surface. An engagement pin 18 is tied to the wire 17 routed through the pulley 16 on the weight 14A, and the engagement pin 18 is adjusted by adjusting the length of the wire 17 and the tension coil spring 19 connected to the wire 17 at an intermediate portion. The bookshelf 5 is hung near the top plate 5a.

On the other hand, the slider 37A is locked to the top plate 5a by the engagement pin 18 and is applied to the reel member 20 which is biased in the winding direction (backward direction of the top plate) by the torsion coil spring 19. They are connected via a wire 21.

As a result, the slider 37A maintains a horizontal mechanical balance between the tension received from the reel member 20 through the wire 21 and the drag force received from the engagement pin 18. In this case, the engagement pin 18 does not receive tension from the wire 17 on the pulley 16.

On the other hand, the fall prevention member 51 may be either the guard bar 51 or the guard string 51B as in the above-mentioned embodiment, but in the present embodiment, each fall prevention member 51 is a slider. 37A to a plurality of pulleys 42
It is different in that it is placed on a stop pin 55 connected to a wire 41A that extends in various ways through. In this case, the stop pin 55 does not receive tension from the wire 41A. Further, the guide rail 52 is provided with a locking portion 56 for arranging each of the fall prevention members 51 at a position that blocks a portion of the bookshelf 5 for taking in and out a book.

In the case of this embodiment having such a structure, when vibration is applied to the earthquake actuating mechanism 10A during an earthquake, the weight 14A rolls down from the tray 15 to connect the engaging pin 18 to each other. Since the upward tension is generated in the wire 17 that is present, the engagement pin 18 comes out of the slider 37A.

The slider 37A is provided on the reel member 2
When the slider 37A pulls the wire 41A, the locking pin 55 and the fall prevention member 51 are released from the locked state by moving horizontally to the back side of the top plate 5A by the urging force of 0. The fall prevention member 51 freely falls to a position where it blocks the portion where the book is taken in and out.

As described above, according to this embodiment,
Since the fall prevention member 51 is not included in the mechanical balancing system of the slider mechanism 30, the fall prevention member 5
Since it is sufficient to maintain the mechanical balance between the slider mechanism 30 and the seismic actuation mechanism 10A without directly considering the own weight of 1, the number of the fall prevention members 51 should be increased as compared with the case of the above-described embodiment. In addition, there is an advantage that the width for setting the threshold value (seismic intensity at which the weight falls) at which the seismic actuation mechanism 10A operates can be widened.

[0058]

As described above, according to the present invention, it is possible to prevent a book from falling due to an earthquake without impairing the convenience of putting in and taking out a book, and to prevent the bookshelf from falling over. Can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a fall prevention device according to an embodiment.

FIG. 2 is a right side view showing a schematic configuration of the fall prevention device.

FIG. 3 is a plan view showing a schematic configuration of the fall prevention device.

FIG. 4 is a right side view showing an operating state of the fall prevention device according to the present embodiment.

FIG. 5 is a front view showing an operating state of the fall prevention device.

FIG. 6 is a front view showing a schematic configuration of a fall prevention device according to another embodiment of the present invention.

FIG. 7 is a right side view showing a schematic configuration of a fall prevention device according to another embodiment.

[Explanation of symbols]

10, 10A ... Earthquake actuation mechanism 14, 14A ... Weight 30
... Sliding mechanism 37, 37A ... Slider 51,51
B ... Guard bar, guard string (fall prevention member) 52 ... Guide rail

Claims (10)

[Claims] 1. A drop prevention member that can move in the vicinity of a portion for taking in and out a book on a predetermined bookshelf, and a plurality of mechanical systems that can be linked to each other by being mechanically balanced. The mechanical disequilibrium based on the generated vibration propagates to other mechanical systems in a chained manner, whereby the fall prevention member is arranged so as to be arranged at a position that interrupts the part for taking in and out of the book. A device to prevent books from falling. 2. A seismic actuation mechanism configured such that the weight placed on the mechanical balance of the first system is vibrated to cause the mechanical balance of the first system to collapse and drop. A slide mechanism configured to move a predetermined amount by collapsing the mechanical balance of the second system due to the drop of the weight when the slider placed in the mechanical balance of the system of FIG. The book drop prevention device according to claim 1, wherein the book drop prevention device is configured to interlock with the slider. 3. The seismic actuation mechanism is configured such that a weight made of a magnet is placed in a mechanical balance of a first system between the weight and a oscillating body which can oscillate by vibration. The fall prevention device for books according to claim 2. 4. The slide mechanism is configured so that the mechanical balance of the second system of the slider is released by the collision with the weight, and the slider moves by the weight of the fall prevention member. The fall prevention device of the book according to claim 3, wherein. 5. The book according to claim 2, wherein the fall prevention members are configured to be movable between a pair of guide rails while being connected to each other. Fall prevention device. 6. The seismic actuation mechanism is configured so that a weight composed of a sphere is tied to one end of a string-like member via a pulley to be placed on a mechanical balance of the first system. The fall prevention device for a book according to claim 2, wherein 7. The slider is moved by a predetermined urging force when the slide mechanism releases the mechanical balance of the second system with respect to the slider by pulling a string-like member when the weight falls. The fall prevention device for a book according to claim 6, wherein the fall prevention device is for a book. 8. The fall prevention member is locked by a locking member connected to the slider between a pair of guide rails while being independent of each other, and the locking is accompanied by the movement of the slider. The book drop prevention device according to claim 7, wherein the book drop prevention device is configured to drop when the locking by the member is released. 9. The book fall prevention device according to claim 1, wherein the fall prevention member is a stretchable rod member. 10. The fall prevention device for a book according to claim 1, wherein the fall prevention member is a string-shaped member that can be wound up.