JP4276290B1 - Equipment storage shelf pallet drop prevention device - Google Patents

Abstract

An object of the present invention is to reliably prevent a pallet sent to an article storage shelf from dropping.
A bracket 2 having an upper opening attached to a transverse beam B of an article storage shelf and a swinging support shaft 7b which is an L-shaped end portion continuous with a central swinging rod 7a are inserted into the bracket 2 from the lateral beam B. The swing operation bar 7c, which is the L-shaped portion at the other end, protrudes upward from the inner side of the horizontal beam B and extends inward of the article storage shelf R, and is supported rotatably on the swing support shaft 7b. The guard plate 10 swings up and down at the upper opening of the bracket 2 and the tension spring 16 stretched between the guard plate 10 and the swing support shaft 7b. The guard plate 10 can be retracted into the bracket 2 against the tension of the tension spring 16 by the pallet P load applied to the swing operation bar 7c and the guard plate 10, and the guard plate 10 is palletized by releasing the load from the guard plate 10. It is possible to project upward on the front side of P.
[Selection] Figure 4

Description

  For example, when a pallet on which an article is placed is placed and stored on each shelf part of an article storage shelf juxtaposed in a warehouse using a forklift or the like, the pallet is caused by other vibrations such as an earthquake. Further, the present invention relates to a pallet drop prevention device for an article storage shelf for preventing the product from falling.

  The article storage shelf is composed of a plurality of vertical frames erected at a predetermined interval and a shelf portion that is bridged between the vertical frames. The shelf is set at a predetermined height position between the front and rear of the vertical frames, and the front and rear horizontal beams are spanned and the front and rear horizontal beams are spanned at predetermined intervals. The pallet on which various articles are placed can be loaded and unloaded via the horizontal beam, which serves as a loading / unloading port, using a forklift or the like. .

  However, since a pallet placed on such an article storage shelf may fall downward from the side beam side serving as an entrance / exit along with the article, for example, due to an earthquake or the like, conventionally, for example, Patent Document 1 The fall prevention device of the load in the automatic warehouse as shown in FIG. This fall prevention device includes a moving plate that is reciprocally movable between a loading platform and a loading shelf, and abuts against a load placed on the moving plate in conjunction with the reciprocating motion of the moving plate. A stopper member is provided that is movably provided at a restriction position where movement in the lateral direction can be restricted and a retreat position where the movement is retracted from the restriction position.

  That is, when the moving plate is positioned on the loading platform, the stopper member is positioned at the restricting position, so that the load placed on the moving plate is prevented from falling from the loading platform by the contact restriction by the stopper member. When the plate moves toward the load shelf, the stopper member moves and is positioned at the retracted position, so that there is no hindrance to the load transfer and switching between the restricting position and the retracted position of the stopper member. Since this is performed according to the reciprocating motion of the moving plate, a driving mechanism for driving the stopper member can be omitted, and the number of parts of the fall prevention device can be reduced, so that the manufacturing cost can be reduced.

  In addition, there is one that prevents a pallet or the like from falling by using a tray device of a rotary storage shelf as shown in Patent Document 2. In this tray device, a stopper device is provided with a protruding piece for preventing an article from falling on the article loading / unloading side of the tray between a protruding position protruding upward from the upper surface of the tray and a retracted position retracting downward from the upper surface of the tray. And an evacuation device including an urging means and a cam means for evacuating the protruding piece to the retracted position at the article loading / unloading position.

That is, since the protruding piece always protrudes upward from the long hole of the outer open end of the tray, it effectively prevents the article from jumping outward by the centrifugal force acting when passing through the bent portion, and Since the protruding piece is retracted downward by the bar at the loading / unloading position, the loading / unloading of articles can be performed smoothly only by the horizontal movement.
JP 2007-45544 A Japanese Patent Laid-Open No. 11-189316

  As described above, in the conventional device as shown in Patent Document 1, even if the load on the loading platform shifts in either the left or right direction, the load abuts against the restricting portion of the stopper member, so that the fall can be prevented. However, when the moving plate moves toward the load shelf, the stopper member becomes movable to the retracted position, so when excessive vibration such as roll due to an earthquake acts on the load, The support of the moving plate by the stopper member cannot function sufficiently. That is, in Patent Document 1, since the prevention of dropping of the moving plate itself is not considered, there is always a risk that the load falls together with the moving plate.

  Furthermore, in the conventional apparatus as shown in Patent Document 1, if the stopper member is pushed from above by the load and remains moved to the retracted position, excessive vibration such as roll due to an earthquake acts on the load. At that time, there is a risk of falling downward for each loading platform.

  Moreover, in the conventional apparatus as shown in Patent Document 2, the protruding piece of the stopper device normally protrudes upward from the long hole of the outer open end of the tray, so that it acts when passing through the bent portion. It is configured to prevent the article from jumping out by force, but when the article is put in and out of the tray, the retracting device by the biasing means and the cam means for moving the protruding piece to the retracted position is used for the article in the tray. Since it is provided at the entry / exit position, when excessive vibration such as roll due to an earthquake acts on the article, the support of the article by the protruding piece of the stopper device cannot function sufficiently. Become.

  Moreover, the conventional apparatus as shown in Patent Document 2 has a cumbersome structure of assembling with many members such as a retracting device with an urging means and a cam means, which increases the manufacturing cost of the article storage shelf itself. It had the problem that it ended up.

  Therefore, the present invention was created in view of the conventional circumstances as described above, and the pallet on which the article is placed can be directly placed on the placement position from above the article storage shelf by the forklift or placed from the front. Even by sliding the pallet from the position of the fall-preventing guard plate placed on the front of the article storage shelf to a predetermined position on the back side, the guard plate is projected above the lateral beam at the front of the shelf so that the pallet is securely It can be pressed, and when removing and carrying out the pallet on which the article is placed, the pallet is lifted from the article storage shelf so that the guard plate can be retracted downward and the pallet can be easily taken out, and the structure is simple. An object of the present invention is to provide a pallet drop prevention device for an article storage shelf that does not require manufacturing costs.

In order to solve the above-described problem, in the present invention, the bracket 2 having the upper opening attached to the transverse beam B forming the front surface of the shelf of the article storage shelf R and the central swing bar 7a are used. Both ends are formed in an inverted L-shape, and a swing support shaft 7b, which is an L-shaped portion at one end, is inserted into the bracket 2 from the lateral beam B, and a swing operation bar 7c, which is an L-shaped portion at the other end, is a lateral beam B. A swing lever 7 that protrudes upward from the inside and extends inward of the article storage shelf R, and is supported rotatably on the swing support shaft 7b, and swings up and down at the upper opening of the bracket 2. A guard plate 10 that protrudes and retracts, and a tension spring 16 that is stretched between the guard plate 10 and the swing support shaft 7b so as to be connected to each other, and the tension spring 16 is a pallet that is applied to the swing operation bar 7c. The tension of the tension spring 16 is increased by the P load. The guard plate 10 can protrude upward from the upper opening of the bracket 2, and the guard plate 10 resists the tension of the tension spring 16 by the pallet P load applied to the guard plate 10 simultaneously with the swing operation bar 7c. 10 can be retracted into the bracket 2.
The tension spring 16 causes the guard plate 10 to protrude from the upper opening of the bracket 2 to the upper position by the pallet P load applied to the swing operation bar 7 c of the swing lever 7, and to the swing operation bar 7 c of the swing lever 7. The tension is adjusted and applied so that the swing lever 7 protrudes upward from the inner side of the lateral beam B by releasing the applied load of the pallet P and allowing the guard plate 10 to retreat inside the bracket 2 with its own weight. be able to.
The swing lever 7 may be formed of a swing operation bar 7c extending inward of the article storage shelf R and curved in a circular arc shape from the center swing bar 7a to be in a horizontal state.
One end of the tension spring 16 is fixed to the tip of an eccentric bar 16a projecting perpendicularly upward from the swing support shaft 7b of the swing lever 7, and the other end of the tension spring 16 is fixed to the guard plate 10. It can be fixed to the free end side.

In the pallet drop prevention device for an article storage shelf according to the present invention configured as described above, the swing lever 7 is swung when the pallet P on which the article Q is placed is placed on the article storage shelf R by a forklift or the like. Since the operation bar 7c is curved in a circular arc shape from the central swing bar 7a and is continuous in a horizontal state, the pallet P can be slid from the front of the lateral beam B to a predetermined position on the back side of the article storage shelf R. Alternatively, by directly placing the pallet P on a predetermined position from above, the swing operation bar 7c is swung downward when the pallet P hits the curved portion of the swing operation bar 7c of the swing lever 7.
At this time, since the guard plate 10 is held by the pallet P until the pallet P slides to the predetermined position on the back side of the article storage shelf R, the swing lever 7 swings downward against this tension. As a result, tension is accumulated in the tension spring 16.
As a result, when the pallet P is further fed to the back side and the press against the guard plate 10 is released, the guard plate 10 jumps up by the tension of the tension spring 16, and the guard plate 10 leaves the tension spring 16 to the lateral beam. It protrudes obliquely upward from B.
The guard plate 10 protruding in this manner makes it possible to prevent the pallet P from falling off the article storage shelf R.
When the pallet P on which the article Q is placed is lifted from the article storage shelf R by a forklift, the swing operation bar 7c of the swing lever 7 that has been retracted inside the transverse beam B is released from the load of the pallet P. The
At this time, the guard plate 10 is retreated and swung inward from the upper opening of the bracket 2 by its own weight, and the pallet P can be unloaded from the article storage shelf R by such retreat of the guard plate 10. Let At the same time, the swing lever 7 is pulled by the tension spring 16 and is swung to the original elevation angle position, and waits for the loading operation of the pallet P again.

  According to the present invention, a pallet P on which an article Q is placed is placed from the front of the article storage shelf R by a forklift, and the pallet P is placed on the back side from the position of the guard plate 10 for preventing fall placed on the front surface of the article storage shelf R. The guard plate 10 can be reliably projected above the lateral beam B at the front position of the shelf, and the pallet P can be securely pressed by sliding it to a position or by placing it directly at a predetermined position from above. it can. Further, when the pallet P carrying the article Q is taken out and carried out, the guard plate 10 can be retreated downward by lifting the pallet P from the article storage shelf R, and the pallet P can be carried out easily, and the structure is simple. Therefore, no manufacturing cost is required.

  That is, when the present invention connects the guard plate 10 that swings in and out of the bracket 2 and the swing lever 7 that swings the guard plate 10 with the tension spring 16, the tension spring 16 is The guard plate 10 can be protruded upward from the upper opening of the bracket 2 by the tension of the tension spring 16 by the pallet P load applied to the swing operation bar 7c, and at the same time as the swing operation bar 7c. This is because the guard plate 10 can be retracted inside the bracket 2 against the tension of the tension spring 16 by the pallet P load applied to the bracket 2. Thus, when the pallet P on which the article Q is placed is placed on the article storage shelf R by a forklift or the like, the tension spring 16 is stretched from the guard plate 10 to the swing support shaft 7b. Only the swing lever 7 can be swung downward against the tension of the tension spring 16 while being retracted and retracted into the bracket 2. Further, when the pallet P load acting on the guard plate 10 is released by sliding the pallet P from the position of the guard plate 10 to a predetermined position on the back side, the guard plate 10 is left to the tension of the tension spring 16 and the lateral beam B is moved. It can project obliquely upward. Thus, since the guard plate 10 protrudes from the upper opening of the bracket 2 and is disposed opposite to the side surface of the pallet P, the guard plate 10 can reliably prevent the pallet P from dropping from the article storage shelf R. For example, when an excessive vibration such as a roll due to an earthquake acts on the article storage shelf R, the pallet P on which the article Q is placed can be prevented from falling downward from the article storage shelf R.

  On the other hand, when the pallet P on which the article Q is placed is lifted from the article storage shelf R by a forklift or the like, the swinging operation bar 7c of the swinging lever 7 retracted downward inside the lateral beam B is used for the pallet P. At the same time, the guard plate 10 is retreated and swung inward from the upper opening of the bracket 2 by its own weight, so that the pallet P from the article storage shelf R is not obstructed by the guard plate 10. Unloading work can be done easily.

  Further, the tension spring 16 is provided with tension applied so that the guard plate 10 protrudes by the pallet P load applied to the swing lever 7 and the guard plate 10 is retracted by releasing the pallet P load. In a state where the pallet P is not placed on the article storage shelf R, the guard plate 10 can be always retracted inside the bracket 2 by its own weight, and thereby the work of carrying out the pallet P from the article storage shelf R can be performed. This can be easily performed without being obstructed by the guard plate 10.

  Further, the swing lever 7 has a swing operation bar 7c extending inward of the article storage shelf R, which is curved in a circular arc shape from the center swing bar 7a and connected in a horizontal state. By sliding from the front of the horizontal beam B, it can be smoothly fed. That is, when the pallet P hits the curved portion of the swing lever 7, the swing lever 7 is retracted and swung downward using the swing support shaft 7b as a rotation shaft, so that the pallet P is moved to the swing operation bar 7c. The sheet can be smoothly fed to a predetermined position on the back side of the article storage shelf R without being stuck. At this time, since the guard plate 10 is pressed by the pallet P, the swing lever 7 is swung downward against the tension of the tension spring 16, so that the tension spring 16 itself has its tension. Accumulated. As a result, when the pallet P is further sent to the back side of the article storage shelf R and the press on the guard plate 10 is released, the guard plate 10 jumps up with the tension accumulated in the tension spring 16 to press the pallet P and store the article. It is possible to reliably prevent the pallet P from dropping from the shelf R.

  One end of the tension spring 16 is fixed to the tip of an eccentric bar 16a projecting perpendicularly upward from the swing support shaft 7b of the swing lever 7, and the other end of the tension spring 16 is fixed to the guard plate 10. Since it is fixed to the free end side, when the guard plate 10 is projected and swung upward by the pulling force of the tension spring 16 as the swinging support shaft 7b of the swing lever 7 is retracted downward, the tension spring The guard plate 10 can be reliably pulled and smoothly protruded and swung upward without being wound on the swing support shaft 7b.

  Note that the reference numerals added in the means for solving the above-described problems and the effects of the invention are given for easy reference to the parts showing the components shown in the drawings. The present invention is not limited to the structure / shape indicated by the reference numeral.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings. The symbol R shown in the figure indicates that the pallet P is placed on the shelf together with the article Q so that the pallet P on which the article Q is placed is transported by a forklift (not shown) and stored in a warehouse. It is an article storage shelf called a so-called pallet rack. As shown in FIG. 1, the article storage shelf R includes, for example, a pair of front and rear horizontal beams B made of, for example, a channel material, a round pipe material, or the like that form a shelf portion between two vertical frames F on the left and right sides. For example, the upper and lower stages are respectively horizontally mounted. And the shelf part which can mount the pallet P which loaded various articles | goods Q by spanning the deck channel D at equal intervals between these front and back horizontal beams B is comprised. It should be noted that the configuration of each part of the article storage rack R does not restrict the present invention, and is merely an example in the present embodiment.

  And the pallet fall prevention apparatus 1 which concerns on this invention is provided in the front side surface of the horizontal beam B located in the front surface of a shelf part for every space | interval corresponding to the mounting position of the pallet P. As shown in FIG. In addition, the rear beam 20 on the opposite rear side is provided with a rear guard 20 made of a plate piece having an upside down L shape at a position substantially corresponding to the position where the pallet drop prevention device 1 is provided. Is placed on the article storage shelf R, the pallet P is positioned on the shelf by pushing the pallet P to the position of the rear guard 20.

  As shown in FIGS. 2 and 3, the pallet drop prevention device 1 has a horizontally long plate-shaped central wall surface portion 2a and a rear side edge portion that has been scraped and bent so that the side surfaces on both the left and right sides are substantially L-shaped. A bent portion of the mounting back surface portion 2c and the side surface portion 2b, comprising a rectangular frame-shaped bracket 2 whose openings are directed vertically by a portion 2b and a mounting back surface portion 2c in which the side surface portions 2b are fixed by welding or the like. Is provided with a substantially U-shaped hanging groove 2d for hanging and fixing to a mounting bolt 4 that is screwed into the front wall or the like of the transverse beam B.

  Further, a shaft hole 5 is provided on one upper side of the central wall surface portion 2 a of the bracket 2, and a shaft hole 6 common to the lateral beam B and the mounting back surface portion 2 c is provided corresponding to the shaft hole 5. A swing lever 7 that swings in the vertical direction around these shaft holes 5 and 6 is supported directly or indirectly by the shaft holes 5 and 6. The central swing bar 7a is formed with opposite L-shaped ends, and the swing support shaft 7b, which is one end L-shaped portion of the swing lever 7, is inserted into the bracket 2 from the shaft hole 6. The swing operation bar 7c, which is the L-shaped portion of the other end of the swing lever 7, protrudes upward from the inner side of the transverse beam B and extends inward of the article storage shelf R.

  That is, as shown in FIG. 2, the swing lever 7c side of the swing lever 7 is curved in an arc shape from the central swing bar 7a, and continues in a horizontal state from the lateral beam B toward the back side. Yes. In this way, when a guard plate 10 to be described later is immersed in the bracket 2 and the swing lever 7 is in the obliquely upper position, the horizontal slide from the front of the lateral beam B can be performed without lowering the pallet P from above. The swing lever 7 itself swings and retreats downward at this arc portion when it hits the curved arc portion, so that the pallet P can be smoothly fed to a predetermined position on the back side of the article storage shelf R.

  In addition, a spacer 12 disposed so as to position a guard plate 10 to be described later in the bracket 2 is fitted into the swing support shaft 7b located inside the bracket 2. A connecting bolt 14 to be described later is screwed to one end side of the spacer 12, and the other end side is supported by being rotatably fitted to the mounting back surface portion 2 c of the bracket 2. The rocking support shaft 7b of the rocking lever 7 is inserted into the screw hole 12a formed in the side surface on the other end side, and the screw 12b is screwed into the surface of the rocking support shaft 7b so that the spacer 12 is pressed. The swing support shaft 7b is fixed (see FIGS. 3B and 3C).

  Further, a nut member 13 formed of, for example, a hexagonal nut is disposed inside the central wall surface portion 2a of the bracket 2, and is screwed to a connecting bolt 14 inserted from the outside of the central wall surface portion 2a of the bracket 2. Thus, the bracket 2 is supported together with the connecting bolt 14. The connecting bolt 14 is screwed into the nut member 13, and further protrudes from the nut member 13 and screwed into one end side of the spacer 12, so that the swing lever 7, the spacer 12, the nut member 13, The connecting bolt 14 is integrated, and the spacer 12, the nut member 13, and the connecting bolt 14 swing with respect to the bracket 2 as the swing lever 7 swings. The spacer 12 is formed with a female screw on one end side of the inner periphery thereof, and is a solid surface on the other end side, into which the swing support shaft 7b in the swing lever 7 is inserted, and is rocked by the screw 12b. The moving lever 7 is fixedly connected.

  In the bracket 2, a guard plate 10 made of, for example, a steel plate, having a locking pointed end portion 9 formed by appropriately dropping a vertex of a right triangle at the tip into a rounded shape is supported by the connecting bolt 14 so as to be swingable. Thus, the bracket 2 is arranged so as to swing up and down in the vertical direction at the opening of the bracket 2. That is, the connecting bolt 14 inserted from the outside of the central wall surface portion 2a of the bracket 2 as described above is screwed into the nut member 13 inside the central wall surface portion 2a, and further protrudes from the nut member 13 so as to protrude from the spacer. 12 is screwed to one end side. And the guard plate 10 itself is fitted by the loose fitting hole 11 formed slightly above the guard plate 10 via the bearing ring 11 a fitted to the connecting bolt 14 and is in contact with one end side surface of the spacer 12. The guard plate 10 is loosely fitted to the connecting bolt 14 and is supported so as to be freely rotatable with respect to the connecting bolt 14 and the swing lever 7. By doing so, the position of the loose fitting hole 11 formed slightly on the upper side of the guard plate 10 by the connecting bolt 14 becomes the swing base end side of the guard plate 10, and the position of the locking point 9 is free to swing. It is designed to be on the end side. In addition, a plate-like stopper 3 a is projected inwardly at a position corresponding to the locking tip end 9 side of the guard plate 10 at the lower end of the central wall surface portion 2 a of the bracket 2, The lower edge portion of the locking pointed end portion 9 of the guard plate 10 that retreats and swings is received and held from below.

  The guard plate 10 is connected by the nut member 13 and the tension spring 16, and swings by being pulled by the elastic force of the tension spring 16 by the swing of the nut member 13, for example, by the pallet P load. When 10 is pressed, the elastic force is accumulated in the tension spring 16 as the swing lever 7 swings. That is, an eccentric bar 16a is projected on the side surface of the nut member 13 at a position in which the rocking lever 7 is in an upwardly raised state when the rocking lever 7 is in a no-load state. For example, one end of a tension spring 16 formed in a coil shape is fixed. The other end of the tension spring 16 is a bolt 16b screwed and supported in a screw hole 16c provided slightly closer to the rocking base end side than the rocking free end of the guard plate 10 through which the connecting bolt 14 is inserted. It is fixed at the tip. The tension spring 16 itself is configured such that when the swing operation lever 7c retreats and swings downward due to the load on the pallet P, the guard plate 10 that plays the role of preventing the fall is interposed by the swing support shaft 7b via the tension spring 16. The tension is set together with the length of the guard plate 10 so as to be pulled and protruded at an arbitrary inclination angle above the transverse beam B, and an appropriate number of openings 17 for weight reduction are formed in the guard plate 10.

  In the vicinity of the shaft hole 5 of the central wall surface portion 2a of the bracket 2, a rod-shaped stopper 3b protrudes inward, and the guard plate 10 protruding upward from the inside of the bracket 2 is inclined at an arbitrary inclination angle. The base side edge of the guard plate 10 is locked by the stopper 3b so as to be directed upward. Thus, the guard plate 10 swings in the vertical direction at the upper opening of the bracket 2 via the tension of the tension spring 16 by the swing of the swing lever 7, and appears and disappears in and out of it. Yes.

  Further, as shown in FIG. 4A, in a state where the pallet P load is not applied to the swing operation lever 7c of the swing lever 7, the guard plate 10 is retracted into the bracket 2 by its own weight, and is stopped by the stopper 3a. At the same time as receiving and holding the lower edge portion of the locking pointed end portion 9 of the guard plate 10 from below, the swing lever 7 protrudes obliquely upward inside the transverse beam B by the tension of the tension spring 16. It is.

  On the other hand, as shown in FIG. 4B, in a state where the pallet P load is applied to the swing operation lever 7 c of the swing lever 7, the guard plate 10 has the upper opening of the bracket 2 by the tension of the tension spring 16. It is made to be in a state of swinging upward and obliquely upward. At this time, for example, the guard plate 10 is disposed so that the upper inclined portion of the locking point portion 9 having a right triangle shape is substantially parallel to the transverse beam B and the lower inclined portion is substantially perpendicular to the transverse beam B.

  As shown in FIG. 5A, when the pallet P on which the article Q is placed is placed on the article storage shelf R by a forklift, the swing lever 7c side of the swing lever 7 is connected to the center swing bar 7a. Since it is curved in an arc shape and is continuous in a horizontal state from the lateral beam B toward the back side, when the pallet P is fed from the front of the lateral beam B, the pallet P is curved by the swing operation lever 7c. When hitting the part, the swing operation lever 7c is retracted and swung downward. At this time, since the guard plate 10 is in a state of being retracted into the bracket 2, only the swing lever 7 swings downward against the tension of the tension spring 16. That is, when the pallet P abuts against the curved portion of the swing lever 7, the swing lever 7 is swung downward without any resistance using the swing support shaft 7b as a rotation shaft. The pallet P is prevented from being fed in by striking the swinging support shaft 7b.

  Then, as shown in FIG. 5B, when the pallet P slides to a predetermined position on the back side of the article storage shelf R and the load of the pallet P on the guard plate 10 is released, the guard plate 10 becomes tension spring 16. It is made to project automatically above the transverse beam B, and the end edge is locked by the stopper 3b with the guard plate 10 facing obliquely upward. That is, the guard plate 10 remains pressed by the pallet P, and the swing operation lever 7c swings and retracts downward against the tension of the tension spring 16, so that tension is accumulated in the tension spring 16 itself. ing. As a result, when the pallet P is further sent to the back side of the article storage shelf R and the press against the guard plate 10 is released, the guard plate 10 jumps up with the accumulated tension of the tension spring 16 and is disposed opposite to the side surface of the pallet P. It has become a thing.

  Next, an example of use of the best mode configured as described above will be described. First, the pallet P on which the article Q is placed is fed by, for example, sliding from above the article storage shelf R or from the front of the lateral beam B using a forklift (not shown). 4A and FIG. 5A, the pallet P is bent by the swing operation lever 7c of the swing lever 7 while the guard plate 10 is retracted downward, as shown in FIGS. The rocking operation lever 7c retreats and swings downward inside the lateral beam B against the tension of the tension spring 16 with the guard plate 10 being immersed and retracted inside the bracket 2 while hitting the portion. That is, when the pallet P hits the curved portion of the swing operation lever 7c, the swing lever 7 is swung downward without any resistance with the swing support shaft 7b serving as a rotation shaft.

  Then, as shown in FIGS. 4B and 5B, when the pallet P is slid to the predetermined position on the back side of the article storage shelf R and the storing operation is completed, the pallet P load on the guard plate 10 is released. Is done. Then, the guard plate 10 is automatically protruded above the lateral beam B depending on the tension of the tension spring 16, and the end edge portion is locked by the stopper 3b with the guard plate 10 facing obliquely upward. That is, when the pallet P passes over the guard plate 10, the guard plate 10 is automatically protruded above the lateral beam B by the tension of the tension spring 16 to press the pallet P and reverse the pallet P forward. Stop movement. The guard plate 10 is held down by the load of the pallet P, and the swing lever 7 has been retracted and swung downward against the tension of the tension spring 16, so that tension is stored in the tension spring 16 itself. It becomes. Therefore, as shown in FIG. 4B, when the press against the guard plate 10 by the pallet P is released, the guard plate 10 is flipped up by the accumulated tension of the tension spring 16 and faces the front side of the pallet P. The guard plate 10 prevents the pallet P from dropping from the article storage rack R due to vibration such as an earthquake or other external force (see FIG. 1).

  On the other hand, when the pallet P loaded with the article Q is lifted by using a forklift (not shown) in order to carry out the pallet P from the article storage shelf R, the pallet P is retreated and swung downward inside the transverse beam B. The swing operation lever 7c of the swing lever 7 is released from the pallet P load. Then, as shown in FIG. 3A, the guard plate 10 is retracted and swung inward from the upper opening of the bracket 2 by its own weight, and the article is stored by retracting the guard plate 10 into the bracket 2. It is possible to carry out the pallet P from the shelf R. At this time, the swing lever 7 is pulled by the tension of the tension spring 16 and is swung to the original upward projecting position to prepare for the next loading of the pallet P.

It is a perspective view which shows the use condition of the goods storage shelf provided with the pallet fall prevention apparatus in the best form for implementing this invention. It is a general | schematic disassembled perspective view of a pallet fall prevention apparatus similarly. Similarly, the attachment state of the pallet drop prevention device is shown, (a) is a front view, (b) is an XX sectional view of (a), and (c) is a YY sectional view of (b). The operation of the pallet drop prevention device is also shown, with (a) a partially cutaway perspective view showing a state before the pallet is placed on the article storage shelf, and (b) showing a state where the pallet is placed on the article storage shelf. It is a partially cutaway perspective view. Similarly, the operation of the pallet drop prevention device is shown. (A) is a state in which the swing lever is swung downward while the guard plate is immersed and retracted inside the bracket due to the pallet load placed on the article storage shelf. (B) is a state in which the pallet placed on the article storage shelf passes through the guard plate and the swing lever is swung downward, and the guard plate is released from the pallet load and protrudes to the front of the pallet. FIG.

Explanation of symbols

Q ... Article P ... Pallet R ... Article storage shelf F ... Vertical frame B ... Horizontal beam D ... Deck channel 1 ... Pallet drop prevention device 2 ... Bracket 2a ... Central wall surface 2b ... Side surface 2c ... Mounting back surface 2d ... Hanging Groove 3a, 3b ... stopper 4 ... mounting bolt 5, 6 ... shaft hole 7 ... swing lever 7a ... central swing rod 7b ... swing support shaft 7c ... swing operation bar 9 ... locking point 10 ... guard plate DESCRIPTION OF SYMBOLS 11 ... Free fitting hole 11a ... Bearing ring 12 ... Spacer 13 ... Nut member 14 ... Connection bolt 15 ... Opening part 16 ... Tension spring 16a ... Eccentric bar 16b ... Bolt 16c ... Screw hole 20 ... Rear guard

Claims (4)

  A bracket having an upper opening attached to a transverse beam that forms the front of the shelf of the article storage shelf, and a swing that is formed in an inverted L shape at both ends via a central swing bar and is an L-shaped portion at one end A swinging lever formed by a support shaft penetrating from the transverse beam into the bracket, and a swinging operation bar which is an L-shaped portion at the other end protruding upward from the inside of the lateral beam and extending inward of the article storage shelf; A guard plate rotatably supported with respect to the support shaft and swinging up and down at the upper opening of the bracket; and a tension spring stretched between the guard plate and the swing support shaft so as to connect each other The tension spring is capable of projecting the guard plate upward from the upper opening of the bracket by letting the tension of the tension spring depend on the pallet load applied to the swing operation bar. Pallet hanging on Pallet fall prevention device of the article storage rack, characterized by comprising the guard plate against the tension of the tension spring as retractable inside the bracket by the load.   The tension spring projects the guard plate from the upper opening of the bracket to the upper position by the pallet load applied to the swing operation bar of the swing lever and releases the pallet load applied to the swing operation bar of the swing lever. 2. A pallet drop prevention device for an article storage shelf according to claim 1, wherein tension is adjusted and applied so that the swing lever protrudes upward from the inner side of the transverse beam by retracting the plate to its own weight.   3. The swing lever according to claim 1, wherein a swing operation bar extending inward of the storage shelf is curved in a circular arc shape from the central swing bar and connected in a horizontal state. Pallet fall prevention device.   When there is no load, the tension spring has one end fixed to the tip of an eccentric bar that protrudes perpendicularly from the swing support shaft of the swing lever, and the other end fixed to the free end of the guard plate. The pallet drop prevention device for an article storage shelf according to any one of claims 1 to 3.

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