JP6445819B2 - Article fall prevention device - Google Patents

Description

  The present invention relates to an article fall prevention device that regulates the fall of articles on a shelf.

  In article shelves that store food items in warehouses, etc., a regulating member that extends to the left and right is placed at the front end of the shelf, and the article is prevented from falling from the shelf due to vibrations such as an earthquake by the regulating member. The device is known. In such an article fall prevention device, every time an article is put in and out of a shelf, the regulating member must be removed and attached, which is complicated. Therefore, for example, an article drop prevention device as disclosed in Patent Document 1 has been developed.

  In the article drop prevention device disclosed in Patent Document 1, drop prevention metal fittings (stopper members) are provided on both the left and right sides to restrict articles from being dropped from the shelf on the front end side of the shelf. This fall prevention metal fitting can be moved up and down, and is urged upward by a spring (biasing means) for the fall prevention metal fitting. Accordingly, the article can be taken in and out of the shelf by pushing down the fall prevention metal fitting, and the fall prevention metal fitting is automatically returned to a position where the article can be regulated by the spring for the fall prevention metal fitting.

JP 61-232804 (page 4, Fig. 2)

  However, in Patent Document 1, since the structure is such that the fall prevention fitting is always urged upward by the fall prevention fitting spring and automatically returns, There is a problem that the user needs to keep the fall-prevention bracket temporarily lowered by hand against the urging force of the fall-prevention bracket spring by hand, etc. .

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide an article fall prevention device that can easily carry out the work of putting in and out the articles on the shelf.

In order to solve the above problems, the article fall prevention device of the present invention is
An article fall prevention device comprising a stopper member that can be moved up and down between an area that allows loading and unloading of articles on a shelf and a regulation area that can prevent the fall of articles on the shelf,
The stopper member is connected to the other end side of the arm portion pivotally supported at one end side, and between a fixed point provided above the pivot support point of the arm portion and an operating point of the arm portion. Is provided with a biasing means,
The article drop preventing device, at least when the stopper member is in a region that allows loading and unloading of the article has a resistance means for Ru giving resistance to rotation of the arm portion,
The arm portion is biased by the biasing means against the resistance force of the resistance means from a state where the arm portion is rotated in a region direction allowing the article to be put in and out against the biasing force of the biasing means. It comes to automatically return to the restricted area by the power,
The resistance means begins to generate the resistance force against the rotation of the arm portion during the rotation of the arm portion in which the stopper member moves from the restriction region to a region where the article can be taken in and out. It is characterized by that.
According to this feature, the return speed of the stopper member to the restriction area in the area in which the article can be put in and out by the resistance means becomes slow, or the speed is almost as low as the stop state, and the stopper member reaches the restriction area. Since the time until this can be delayed, articles can be easily put in and out of the shelf using the return time of the stopper member. In addition, since the resistance force by the resistance means does not work in the initial stage of moving the stopper member from the restriction area toward the area where the article can be taken in and out, the operation of the stopper member is not only smooth, It can be surely known that the suppression of the movement of the member has been started.

The resistance means is a friction material.
According to this feature, the return movement of the stopper member to the restriction region can be suppressed with an inexpensive and simple structure.

The resistance means is a damper.
According to this feature, a stable movement resistance can be applied to the return movement of the stopper member to the restriction region by the damper, so that the return movement of the stopper member is reliably performed.

It is characterized in that the angle formed by the front Kikaido fulcrum and a line segment connecting said point of action and a line segment connecting the acting point and the fixed point, the stopper member is larger as approaching to the regulatory region Yes.
According to this feature, the angle formed by the two line segments differs depending on the position of the stopper member, and the moment applied to the arm portion changes. Therefore, the stopper can be adjusted by adjusting the moment and the resistance force by the resistance means described above. The return speed of the member can be set as appropriate.

It is a front view which shows the bookshelf to which the article | item fall prevention apparatus in Example 1 was attached. It is a perspective view which shows an article fall prevention apparatus. It is a sectional side view which shows the state in which the stopper member in the goods fall prevention apparatus of Example 1 was arrange | positioned in the upper position. It is a sectional side view which shows the state in the middle of pushing down a stopper member to a downward position. It is a sectional side view which shows the state by which the stopper member is arrange | positioned in the downward position. It is a sectional side view which shows the state arrange | positioned in the area | region which can put in / out the stopper member which returns in Example 1. FIG. It is a sectional side view which shows the state in which the stopper member which returns in Example 1 is arrange | positioned in the control area | region. It is a sectional side view which shows the return movement of the stopper member in Example 2. FIG. It is a sectional side view which shows the modification of an article fall prevention apparatus.

  EMBODIMENT OF THE INVENTION The form for implementing the article | item fall prevention apparatus which concerns on this invention is demonstrated below based on an Example.

  The article fall prevention device according to the first embodiment will be described with reference to FIGS. Hereinafter, the left side of the screen in FIG. 3 will be described as the front side (front side) of the article fall prevention device, and the left and right sides as viewed from the front side of the article fall prevention device will be described as the left and right sides of the article fall prevention device.

  As shown in FIG. 1, in a library or the like, a bookshelf 2 that houses books 20, 20,. The bookshelf 2 is composed of three columns 3, 3 and 3 which are separated from each other on the left and right sides, and horizontal connecting rods 4, which connect the opposing surfaces of the upper and lower ends of the columns 3, 3 and 3 adjacent to each other. Are composed mainly of upper and lower shelf boards 5, 5,... Supported on the front surfaces of the columns 3, 3, 3 adjacent to each other.

  A large number of engaging holes 6, 6,... Arranged in a line in the vertical direction are provided on the front surfaces of the left and right support columns 3, 3, and a large number of left and right columns in the vertical direction are provided on the front surface of the central support column 3. .. Are provided. Further, each shelf plate 5 is fixed to a bracket (not shown) having a hook at the rear end, and by engaging the hook of the bracket with the engagement holes 6, 6,. 3 is supported in a cantilevered state.

  As shown in FIG. 2, the article fall prevention device 1 includes a pair of left and right supports 7, 7, a fall preventer 8 attached to both supports 7, 7, and a tension coil spring 9 as an urging means. , 9 and so on. The support body 7 is comprised from the outer-plate part 7a and the inner-plate part 7b divided | segmented into right and left. The support body 7 is a box-shaped body having a space inside when the left and right outer plate portions 7a and inner plate portions 7b are connected, and a slit 13 is formed on the front side. Further, a friction member 15 made of rubber or the like is fixed to the outer plate portion 7 a of the support 7. The left and right supports 7, 7 are fixedly attached to both ends of the upper surface of the shelf plate 5 of each step. The supports 7 and 7 may be fixed to the upper surface of the shelf plate 5 of each step by bolts or the like, and a hook is provided at the rear end of the supports 7 and 7 so that the front surfaces of the columns 3 and 3 are engaged. The hooks may be attached to the joint holes 6, 6,.

  As shown in FIGS. 2 and 3, the fall prevention device 8 includes a pair of left and right support arms 10 and 10 (arm portions) with front end portions 10 b and 10 b protruding from the insides of both supports 7 and 7. The stopper members 11 are provided on the front end portions 10b and 10b of the support arms 10 and 10, respectively. The support arm 10 has a pivot shaft 12 fixedly provided at a rear end portion 10a thereof and pivotally supported in recesses provided on the inner side of the outer plate portion 7a and the inner plate portion 7b of the support body 7, respectively. When the support arms 10 and 10 are rotated about the rotation shaft 12, a stopper member is formed between an upper position indicated by a solid line in FIG. 2 and a lower position indicated by a one-dot chain line in FIG. 11 can move up and down the front end side of the shelf board 5.

This upper position is included in a certain regulation region where the stopper member 11 can substantially prevent the books 20, 20,... On the shelf board 5 from dropping. The highest point in the movable range of. The upper position may be an arbitrary upper position (one point) as long as it is included in the restriction area. Further, the restriction region indicates a range from a position (one point) where the stopper member 11 is disposed at a predetermined height above the upper surface of the shelf board 5 to the uppermost point of the movable range of the stopper member 11, and the restriction region. In the region, the stopper member 11 can stably prevent the books 20, 20,.
In the lower position, the stopper member 11 does not obstruct the loading / unloading of the books 20, 20,... On the shelf 5, and allows the books 20, 20,. It is included in a certain lower region, and in the present embodiment, it indicates the lowest point of the movable range of the stopper member 11. Note that the lower position may be an arbitrary lower position (one point) as long as it is included in the area where the withdrawal is possible. In addition, the lower region is the lowest point (from the upper surface of the shelf board 5) of the movable range of the stopper member 11 from the position (one point) where the stopper member 11 is disposed at a predetermined height above the upper surface of the shelf board 5. , And the lower side), and within the lower region, the stopper member 11 hardly inhibits the loading / unloading of the books 20, 20,.

  Further, the support arms 10 and 10 have projecting portions 10c and 10c in which a part of outer peripheral edges of the rear end portions 10a and 10a project rearward, and the projecting portion 10c is a stopper member 11 as will be described later. Depending on the position, the friction member 15 can be contacted and slidable.

  As shown in FIGS. 2 and 3, one end of the tension coil spring 9 is fixed to a through hole 16 provided at a predetermined position of the support arm 10, and the other end is an outer plate portion of the support body 7. It is fixed to a fixing pin 17 provided on the rear end upper side than the rotating shaft 12 in 7a. Further, the tension of the tension coil springs 9 and 9 is larger than the descending force due to the weight of the fall prevention tool 8. According to this, a biasing force always acts on the support arms 10 and 10 by the tension coil springs 9 and 9 so that the return force is applied so that the stopper member 11 returns to the upper position. Yes. Hereinafter, only the left side as viewed from the front of the article fall prevention device 1 will be described, and the description on the right side will be omitted. Although an example in which the tension coil springs 9 and 9 and the friction members 15 and 15 are provided on both the support bodies 7 and 7 has been described, the tension coil spring 9 and the friction member 15 are provided only on one support body 7. But it works the same way.

  Next, a series of operations will be described in which the stopper member 11 is once lowered from the upper position to the lower position and then the stopper member 11 is automatically returned from the lower position to the upper position. Although the following operation of the stopper member 11 will be described using the moment of the support arm 10, the tensile force of the tension coil spring 9 acting on the support arm 10 is made substantially constant for the sake of simplicity. Actually, the tensile force of the tension coil spring 9 acting on the support arm 10 gradually increases as it approaches the lower position within the movable range of the stopper member 11, and the moment arm length described later gradually increases. This is because the change amount of the moment arm length is much larger than the change amount of the tensile force.

  FIG. 3 shows a normal state in which the stopper member 11 is disposed at the upper position. In this state, a line segment α connecting the rotation fulcrum P1 that is the center of the rotation shaft 12 and the action point P2 that is the center of the through hole 16 of the support arm 10, and the center of the action point P2 and the fixing pin 17. The angle θ1 woven by the line segment β connecting the fixed point P3 is the maximum in the movable range of the stopper member 11. Therefore, the moment arm length R1 connecting the rotation fulcrum P1 and the line segment β becomes the maximum in the movable range of the stopper member 11, and a large moment acts on the support arm 10.

  As shown in FIG. 4, when the books 20, 20,... Are put in and out of the shelf board 5, the user supports against the return force to the upper position (regulation area) by the tension coil spring 9. The arm 10 is rotated to push down the stopper member 11 from the upper position (regulation area) toward the lower position (lower area). By rotating the support arm 10 toward the lower region, the projecting portion 10 c and the friction member 15 come into contact with each other, and the projecting portion 10 c and the friction member 15 come into contact with each other, so that the friction force is applied to the support arm 10. Will occur.

  In this embodiment, the stopper member 11 moves the books 20, 20,... On and off the shelf board 5 when the protruding surface 10d of the support arm 10 abuts against the friction member surface 15a of the friction member 15. Are arranged in a lower area where the books 20, 20,... On the shelf board 5 can be taken in and out. In other words, the stopper member 11 is disposed in a restriction region in which the books 20, 20,... On the shelf board 5 can be prevented from dropping when the protruding portion 10c does not contact the friction member 15.

  Further, at this time, the angle θ2 woven by the line segment α and the line segment β is smaller than the angle θ1 in the normal state in which the stopper member 11 is disposed at the upper position. Therefore, the moment arm length R2 connecting the rotation fulcrum P1 and the line segment β at a right angle is shorter than the moment arm length R1, and a small moment acts on the support arm 10 as compared with the state of FIG.

  As shown in FIG. 5, the contact area between the protrusion surface 10d of the support arm 10 and the friction member surface 15a of the friction member 15 gradually increases as the stopper member 11 is further pushed down from the state of FIG. Thus, when the stopper member 11 is disposed at the lower position, the entire surface of the friction member surface 15a of the friction member 15 comes into contact with the protruding portion surface 10d.

  In this state, the angle θ3 woven by the line segment α and the line segment β is the smallest in the movable range of the stopper member 11, and the moment arm length R3 connecting the rotation fulcrum P1 and the line segment β is the stopper. A minimum moment is applied to the support arm 10 in the movable range of the member 11. That is, the support arm 10 is adapted to have a large moment as it approaches the upper position from the state where the stopper member 11 is disposed at the lower position.

  When the hand is released in a state where the stopper member 11 is positioned at the lower position, the stopper member 11 starts to return due to the return force to the upper position by the tension coil spring 9. At this time, the frictional force generated between the friction member 15 and the support arm 10 described above works as a return resistance of the support arm 10 and delays the return speed of the stopper member 11 to the upper position.

  Thus, in the state where the stopper member 11 is disposed at the lower position, the return speed of the stopper member 11 to the upper position is low, so the time until the stopper member 11 reaches the restriction region. Can be delayed, and the books 20, 20,... Can be easily put in and out of the shelf board 5 using the return time.

  Further, as described above, the protrusion 10c of the support arm 10 starts to contact and slide against the friction member 15 in the process of pushing down the stopper member 11 from the restriction region toward the lower region. Therefore, since the resistance force by the friction member 15 does not act on the support arm 10 in the initial stage of moving the stopper member 11 from the restriction region toward the lower region, the operation of the stopper member 11 is smooth. Further, the protrusion 10c of the support arm 10 and the friction member 15 come into contact with each other, so that the operator can surely recognize whether or not the movement suppression is acting on the stopper member 11.

  In addition, since the friction member 15 having a very inexpensive and simple structure can provide frictional resistance to the rotational torque of the support arm 10 and suppress the return movement of the stopper member 11, the manufacturing cost can be reduced. Easy to process.

  Next, as shown in FIGS. 6 and 7, as the stopper member 11 slowly returns to the upper position, the contact area between the protrusion surface 10d of the support arm 10 and the friction member surface 15a of the friction member 15 gradually decreases. Thus, the frictional resistance against the rotation of the support arm 10 is also gradually reduced. Further, as described above, the support arm 10 changes so that a large moment acts as the stopper member 11 approaches the upper position from the state in which the stopper member 11 is disposed at the lower position. It will surely return to the upper position.

  In this way, the stopper member 11 is always returned to the upper position after a predetermined time, so that it is possible to prevent the stopper member 11 from being forgotten to be lifted, and to ensure that the books 20, 20,. I can stop. Moreover, in the control area | region which can prevent fall of the books 20, 20, ..., the stopper member 11 can be efficiently returned to an upper position.

  Further, as described above, since the moment applied to the support arm 10 gradually changes, the moment and the frictional resistance force by the friction member 15 can be mutually adjusted, and the return speed of the stopper member 11 is appropriately set. be able to.

  In this embodiment, rubber is selected as the friction member 15. However, for example, a non-woven fabric or a synthetic resin material can be used instead of rubber, and the support arm 10 can be selected by appropriately selecting the friction member 15. Since the frictional resistance force that opposes the rotational torque of the stopper member 11 can be changed, the return speed of the stopper member 11 can be easily adjusted.

  In addition, for example, the return speed of the stopper member 11 can be extremely slowed or reduced to a low speed as close as possible to the stop state so that it takes a long time for the stopper member 11 to return to the restriction region. Furthermore, when the operator pushes up the stopper member 11 from below to the restriction region against the frictional resistance of the friction member 15, the time until the stopper member 11 returns to the upper position is intentionally shortened. May be.

  In the present embodiment, the boundary between the restriction region and the lower region is the position (one point) where the stopper member 11 is disposed above the upper surface of the shelf board 5 by a predetermined height. However, the present invention is not limited to this. In the movable range of the stopper member 11, the upper side of the upper surface of the shelf plate 5 may be set as the restriction region, and the lower side of the upper surface of the shelf plate 5 may be set as the lower region.

  Next, an article fall prevention apparatus according to a second embodiment will be described with reference to FIG. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 8A, the support arm 100 is a meshing portion 100c in which a part of the outer peripheral edge of the rear end portion 100a is formed in a gear shape. A rotary damper 151 is provided on the outer plate portion 7 a of the support 7. The rotary damper 151 includes a rotating shaft 151b whose rotation is decelerated by viscous resistance such as oil, and a meshed portion 151a that meshes with the meshing portion 100c of the support arm 100 is formed on the outer peripheral surface of the rotating shaft 151b. Yes.

  In a state where the stopper member 11 is disposed at the lower position, the meshing part 100c meshes with the meshed part 151a. According to this, the return speed of the support arm 100 is decelerated by the oil viscous resistance of the rotary damper 151.

  Further, when the stopper member 11 is moved from FIG. 8A to FIG. 8B to the position where the meshing portion 100c and the meshed portion 151a are disengaged (see FIG. 8C), the support arm is moved. There is no viscous resistance to 100 return. For this reason, the stopper member 11 returns to the upper position at a relatively high speed.

  Note that the resistance means for suppressing the return movement of the stopper member 11 is not limited to acting only on the protruding portion 10c of the support arm 10, and for example, as shown in FIG. A friction member 15 ′ is fixed to the portion 7 a in the vicinity of the slit 13 on the front side, and as shown in FIG. 9B, the friction member 15 ′ is moved down by pushing the stopper member 11 downward. The return movement of the stopper member 11 may be suppressed by being pressed against the side surface of the support arm 10. Furthermore, a resistance means may act on the stopper member 11. That is, the resistance means may be provided at any position as long as it acts on the fall prevention tool 8 at least when the stopper member 11 is in an area where the books 20, 20,. Absent.

  Further, the resistance means is not limited to the frictional resistance force by the friction member 15 and the viscous resistance force of the rotary damper 151. For example, an elastic engagement force such as a synthetic resin acting on the support arm 10 or the stopper member 11 may be used. .

  Moreover, in the said Example, although the stopper member 11 was raised / lowered up and down because the support arm 10 rotated centering on the rotating shaft 12, it is not restricted to this, For example, there is no support arm 10 and a stopper member is used. The structure which moves along the guide groove connected to an up-down direction may be sufficient. Moreover, in the said Example, the lower side in the movable range of the stopper member 11 is made into the lower area | region which can take in / out the books 20, 20, ..., and the upper side in the movable range of the stopper member 11 is the books 20, 20, .... Although the restriction region that can prevent the fall is described, for example, the upper side in the movable range of the stopper member 11 is the region that allows the books 20, 20,... To be put in and out, and the lower side in the movable range of the stopper member 11 is the book 20 , 20,... May be a restricted area that can prevent the fall.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the mode in which the friction member 15 always acts on the support arm 10 while the stopper member 11 returns and moves in the lower region has been described. However, the present invention is not limited thereto, and the stopper member 11 is in the lower region. The friction member 15 may act on the support arm 10 only during the return movement of a part of the range.

  In the above embodiment, the friction member 15 does not act on the support arm 10 while the stopper member 11 returns and moves in the restriction region. However, the present invention is not limited to this, and the stopper member 11 is not restricted to the restriction region. The friction member 15 may act on the support arm 10 continuously from the lower region even during the return movement.

  In the above embodiment, the tension coil spring 9 extending obliquely upward from the support arm 10 has been described as the biasing means. However, the tension coil spring 9 is arranged to extend vertically and the support arm 10 is pulled up vertically. An urging force may be applied. Further, the biasing means is not limited to the tension coil spring 9 but may be an elastic body that pushes upward from below.

  Further, although the article storage shelf has been described as the bookshelf 2 that stores the books 20, 20,..., The present invention is not limited to this, and for example, it is obvious that it can be used as a display shelf for displaying food and beverages.

DESCRIPTION OF SYMBOLS 1 Article fall prevention device 2 Book rack 3 Post 5 Shelf board (shelf stage)
6 Engagement hole 7 Support body 8 Fall prevention tool 9 Tension coil spring (biasing means)
10 Support arm (arm part)
10c Protruding part 11 Stopper member 12 Rotating shaft 15, 15 'Friction member (friction material, resistance means)
16 Through-hole 17 Fixing pin 20 Book (article)
100 Support arm (arm part)
100c meshing part 151 rotary damper (damper, resistance means)
151a Engaged portion P1 Rotating fulcrum P2 Action point P3 Fixing point R1, R2, R3 Moment arm length α Line segment β Line segment θ1 to θ3 Angle woven by two line segments

Claims (4)

An article fall prevention device comprising a stopper member that can be moved up and down between an area that allows loading and unloading of articles on a shelf and a regulation area that can prevent the fall of articles on the shelf,
The stopper member is connected to the other end side of the arm portion pivotally supported at one end side, and between a fixed point provided above the pivot support point of the arm portion and an operating point of the arm portion. Is provided with a biasing means,
The article drop preventing device, at least when the stopper member is in a region that allows loading and unloading of the article has a resistance means for Ru giving resistance to rotation of the arm portion,
The arm portion is biased by the biasing means against the resistance force of the resistance means from a state where the arm portion is rotated in a region direction allowing the article to be put in and out against the biasing force of the biasing means. It comes to automatically return to the restricted area by the power,
The resistance means begins to generate the resistance force against the rotation of the arm portion during the rotation of the arm portion in which the stopper member moves from the restriction region to a region where the article can be taken in and out. An apparatus for preventing an article from falling. 2. The article fall prevention device according to claim 1 , wherein the resistance means is a friction material. The apparatus according to claim 1 , wherein the resistance means is a damper. And characterized in that the angle formed by the front Kikaido fulcrum and a line segment connecting said point of action and a line segment connecting the acting point and the fixed point, the stopper member is larger as approaching to the regulatory region The article fall prevention device according to any one of claims 1 to 3 .

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