JP6238015B2 - Rack load drop prevention device - Google Patents

Description

  The present invention relates to a load drop prevention device for preventing a load from falling from within a load support space due to a swing of a rack in the front-rear direction caused by an earthquake.

  As described in Patent Document 1, as a load drop prevention device for a rack, a horizontal rail along the frontage direction of the load support space is provided at the entrance of the load support space of the rack. The swing detection swinging body attached to this rack is supported when the earthquake occurs, so that it can be moved up and down between a retracted position that allows the loading and unloading movement and a working position that prevents the load from slipping out from the entrance of the load supporting space. There is known a load drop prevention device that prevents the sliding of the load from the entrance of the load support space by switching the recumbent from the retracted position to the operating position when the rack swings with the swing of the rack.

Japanese Patent Laid-Open No. 11-178665

  Therefore, in the configuration of the conventionally known load drop prevention device as described in Patent Document 1, the load support space slips from the load support space by a rigid recumbent having the same length as the width of the load support space. Since the load to be taken out is received, the larger the weight of the load to be handled, the larger the large-sized heavy load of the bending rigidity has to be used. In addition, with the necessity of using a thick, large and heavy buoy, the mechanism for supporting the recumbent to move up and down is required to have a certain level of strength. This results in a heavy weight and a great cost.

The present invention proposes a rack load drop prevention device that can solve the conventional problems as described above, and the rack load drop prevention device according to the present invention is provided with the following embodiments. To facilitate understanding of the relationship, the reference numerals used in the description of the embodiment are shown in parentheses, and the load support space (6) is placed at the entrance of the load support space (6) of the rack (1). A high position (H) that is stretched along the frontage direction and allows the loading and unloading movement of the load at the entrance of the load support space (6), and the slide of the load (W) from the entrance of the load support space (6). A cord-like body (8) that can be raised and lowered between the low position (L) to be blocked, and a cord-like body holding means (10) attached to the rack columns (4) on both sides in the frontage direction of the load supporting space (6) And a cord-like body holding means (11), the cord-like body holding means (10), at least both ends of the cord-like body (8), the high position (H) and the low position (L) is held so that it can only move up and down in a vertical straight path between, and the cord locking means (11) is at least against both ends of the cord (8) at the high position (H). And a movable latch (12) that can be freely engaged and disengaged, and a swinging swinging body (13) for detecting rack shaking, and the movable locking tool (12) and the swinging sensing swinging body (13) When the swing sensing swinging body (13) swings along with the rack , the movable locking tool (12) is interlocked so as to be detached from the cord (8) at the high position (H). In the load drop prevention device, the load support space (6) is partitioned by a rack column (4) and arranged in parallel in the frontage direction, and the cord-like body (8) is arranged in parallel with a plurality of load support spaces ( 6) has a length stretched over the cord, and the intermediate position of the cord (8) is in the middle of the cord holding means (10) that holds the intermediate position of the cord (8). The cord (8) moves relative to its length. The stopper (18a, 18b) which prevents is attached .

  According to the configuration of the present invention, the cord-like body that is a member for preventing the fall of the load is withdrawn away from the entrance of the load-supporting space at normal times. There is no need to evacuate and there is no possibility of affecting the loading and unloading work in normal times. In addition, when the rack swings beyond the allowable limit, such as in the event of an earthquake, the movable locking device is interlocked with the swing of the swing detection body of the rack, and the movable locking device is placed at a high position. The cords are separated from both ends of the cords, and the cords fall by gravity from a high position to a low position. Therefore, the load that is about to slide out from the entrance of the load support space due to the swing of the rack can be received by the cord-like body that has been switched to the low position, and can be prevented from falling from the load support space.

  Thus, according to the present invention device, it is possible to prevent the load from falling from the load support space due to the shaking of the rack in the event of an earthquake or the like. In particular, according to the configuration of the present invention, a wire rope, a chain, etc. The flexible cable-shaped body receives the load that is about to slide out of the load support space, so any cable-shaped body having a tensile strength corresponding to the weight of the load to be received may be used. Compared to the case of using a lying ridge, the object can be achieved with a thin and light cord. In addition, the cable body is held by the cable body holding means attached to the rack column so that both ends can only be moved up and down in the vertical straight path, and the tension acting on the cable body when receiving the load is applied. , And can be supported by a rack post through the holding means. Therefore, both ends of the cable-shaped body having a large bending strength are applied, as in the case where the tension acting on the cable-shaped body at the time of receiving the load is received by the bending stress of the movable member that supports the both ends of the cable-shaped body. A movable member for support is not required, and the overall configuration of the apparatus can be implemented at low cost.

The rack (1) provided with the load support space (6) has a load support space (6) according to the support strength of the load support frame (3) forming the load support surface of each load support space (6). Since the width in the frontage direction is determined, generally, a plurality of load support spaces (6) are arranged in parallel at the same level via struts (partition frames (2)). In such a case, a plurality of load support spaces (6) arranged side by side at the same level are configured to be covered by a single cord (8), or load support spaces (6 at the same level) (6 ) And the cord-like body (8) can be stretched independently. Thus, when the former single cord (8) is configured to cover a plurality of load supporting spaces (6), the cord is only applied to both ends of the long cord (8). Although the rod-like body holding means (10) and the cord-like body locking means (11) may be provided side by side , according to the present invention, the rack pillars positioned between both ends of the rope-like body (8) Also, the cord holding means (10) and the cord locking means (11) are attached, and the cord (8) penetrates the cord holding means (10) at the intermediate position. In addition , at the intermediate position of the cord-like body (8) penetrating the cord-like body holding means (10) at the intermediate position, the cord-like body (8 ) is fitted with a stopper (18a, 18b) to prevent the relative movement in the longitudinal direction.

According to the above-described configuration of the present invention, the number of the cord-like body holding means can be reduced as compared with the case where the cord-like bodies are independently stretched for each load supporting space arranged in parallel at the same level. Rather, the tension acting on the cords at the time of receiving the load can be divided for each load support space by the rack support means located on both sides of each load support space and can be received by the rack columns. Accordingly, a plurality of load supporting spaces arranged in parallel at the same level can be covered with a single cord-like body, and the load applied to the cord-like body is reduced and a thin lightweight cord-like body is utilized. It becomes possible.

The cord-like body holding means (10) may be configured to be separated from the cord-like body locking means (11) to be independent structures, and each may be configured to be attached to a rack column. It is preferable to configure. That is, the cord-like body holding means (10) is provided with a vertically long casing (14) for accommodating the cord-like body locking means (11) on the inside, and the left and right side plates (15a, 15a, to 15b), provided an elongated slot capable of lifting between the high position with the cord-like member (8) penetrates in the horizontal direction (H) and a low position (L) (17a, 17b), the In the cord (8), the cord (8) moves in the length direction relative to the cord holding means (10) holding the intermediate position of the cord (8). A stopper (18a, 18b) is attached to the cord-like body locking means (11), and the cord-like body locking means (11) is pivotable in the longitudinal casing (14) by a horizontally-supported horizontal support shaft (21). A movable locking tool (12) that is supported and engages with the cord (8) at the high position (H) between the pair of left and right vertically elongated holes (17a, 17b) can be provided . Specifically, it is desirable that the stoppers (18a, 18b) are attached to the left and right side plates (15a, 15b) of the vertically long casing (14) adjacent to the outside in pairs.

  According to this configuration, the left and right side plates of one vertically long casing as a protective case for housing the cord-like body locking means can be used as the cord-like body holding means. Compared with the case where both of the stopping means must be separately attached to the rack post, not only can the labor and cost when implementing the apparatus of the present invention be reduced, but also the movement of the cord-like body locking means can be reduced. The position of the cord-like body portion with which the locking tool is engaged and disengaged is determined by the pair of left and right vertically elongated holes, and the operation of the cord-like body locking means can be performed reliably. Of course, the tension acting on the cord at the time of receiving the cargo can be transmitted from the stopper attached to the cord to the rack column to which the longitudinal casing is attached via the side plate of the longitudinal casing.

  The movable locking device (12) of the cord-like body locking means (11) includes a swing piece (20) pivotally supported by a horizontal support shaft (21) so that it can swing back and forth. The rocking piece receiving part (19) provided at a position away from the support shaft (21) of the rocking piece (20), the rocking rocking rocking body (13) for the rack shaking is the movable locking The swing piece (20) of the tool (12) and a weight (22) attached to a position away from the support shaft (21) of the swing piece (20) are attached with gravity or a spring. The weight (22) is configured so that the position of the weight (22) is stabilized by the force, and when the weight (22) swings around the support shaft (21) in the front-rear direction together with the swing piece (20), The cord-shaped body receiving portion (19) can be configured to move to a non-acting position where it is detached from the cord-shaped body (8). According to this configuration, the movable locking member of the cord-like body locking means and the swinging swinging body of the rack are configured by attaching the cord-like body receiving portion and the weight to one pivoted pivoting body. It is possible to reduce the number of parts of the entire apparatus and to carry out at a low cost.

  In the case of implementing the above configuration, the swing piece (20) is pivotally supported by the support shaft (21) so that it can swing back and forth in the middle in the vertical length direction, and the cord receiving portion (19) Is provided at the lower end of the swing piece (20), the weight (22) of the swing detection swing body (13) of the rack is attached to the upper end of the swing piece (20), this swing piece ( 20) keeps the swinging piece (20) in a standing position, and includes a restraining part (stopper pin (23)) that receives the swinging piece (20) and a spring (24) that makes the swinging piece (20) contact the restraining part. Can be attached. In this case, when the swing piece swings even slightly from the standing posture due to the inertial force acting on the weight as the rack swings, the gravity acting on the weight further pushes the swing piece. Since the swinging is large and strong, when the rack swings beyond the allowable limit, the cable-shaped body receiving portion can be reliably detached from the cable-shaped body locked at the high position. Of course, the swinging piece (20) is pivotally supported by the support shaft (21) at the upper end position in the vertical length direction so that the swinging piece (20) can swing back and forth. The weight (22) of the swing detection rocking body (13) provided at an intermediate position of the piece (20) is attached to the lower end of the rocking piece (20), and the swinging piece (20) It is also possible to configure such that the hanging posture is maintained by gravity acting on the weight (22). According to this configuration, the restraining portion and the spring for holding the swinging piece in the upright posture as in the previous configuration are not necessary, and can be implemented at low cost.

FIG. 1 is a front view of a main part of a rack in a state in which a load fall prevention cable-like member is held at a high position that allows loading and unloading movement. FIG. 2 is a vertical side view of the main part of the same rack. FIG. 3 is an enlarged longitudinal sectional side view of the load drop prevention device in a state where the load fall prevention cord-like body is held at a high position allowing movement of the load in and out. 4 is an enlarged longitudinal front view of the load drop preventing device shown in FIG. FIG. 5 is an enlarged longitudinal sectional side view of the load drop prevention device in a state where the load fall prevention cord-like body is switched to a low position that prevents the load from slipping out. 6 is an enlarged longitudinal front view of the load drop preventing device shown in FIG. FIG. 7 is an enlarged longitudinal sectional side view showing a modification of the load drop prevention device. FIG. 8 is an enlarged vertical side view showing another modified example of the load drop preventing device.

  1 and 2, the rack 1 is well known in the art, and is laid horizontally between the partition frame 2 erected at appropriate intervals in the frontage direction and between the adjacent partition frames 2 at appropriate intervals in the vertical direction. Each partition frame 2 is composed of a front column 4, a rear column 5, and a lattice material (not shown) installed between the columns 4 and 5. Thus, the front side of the rack 1 is released and the load W is loaded on the load support frame 3 by the horizontally long space surrounded by the partition frames 2 adjacent in the frontage direction and the load support frames 3 adjacent in the vertical direction. A load supporting space 6 to be supported is formed. Since the rack 1 is loaded and unloaded with respect to each load support space 6 from the front side, the detailed structure is not shown on the back side of the rack 1, but it is well known in the art. As described above, the brace structure 7 for preventing the rack 1 from swinging in the frontage direction is also provided.

  At the entrance of each load support space 6 in the rack 1 having the above-described configuration, a load drop preventing rope (hereinafter, abbreviated as a rope) 8 is stretched along the frontage direction. The cord-like body 8 has a necessary tensile strength and is made of a flexible wire rope, chain, or the like, and can cover a plurality of load support spaces 6 arranged in parallel in the front direction of the rack 1. A cord support unit 9 that supports both ends and an intermediate position of the cord 8 is attached to the front support column 4 of each partition frame 2.

  All the cord support units 9 are of the same structure, and the cord 8 is shown in FIG. 3 and FIG. 4 as a high position H allowing the load W to move in and out of the load support space 6, and FIG. 5 and FIG. 6, a cord-like body holding means 10 that holds the load W from the low position L that prevents the load W from slipping out from the entrance of the load supporting space 6, and a cord-like body locking means 11. The cord-like body locking means 11 includes a movable locking tool 12 for locking the cord-like body 8 at the high position H, and a swing sensing swinging body 13 for the rack 1.

  The cord-like body holding means 10 includes a vertically long casing 14 that accommodates the cord-like body locking means 11 inside. This vertically long casing 14 is provided with a vertically long groove-shaped body 15 composed of a front plate 15a and left and right side plates 15b, 15c, and mounting seat plates 16a, 16b provided continuously from both upper and lower ends of the vertically long groove-shaped body 15. The upper and lower mounting seats 16a and 16b are attached to the front side of the front column 4. The left and right side plates 15b and 15c in the vertically long casing 14 are provided with vertically long holes 17a and 17b that can be moved up and down between the high position H and the low position L in a state where the cord-like body 8 penetrates in the horizontal direction. A pair of left and right stoppers 18a and 18b are fixed to the cord-like body 8 by screws or the like adjacent to the outside of the left and right side plates 15b and 15c. In addition, since the illustrated cord-like support unit 9 supports an intermediate portion of the cord-like body 8, the cord-like body 8 extends from the cord-like support unit 9 to the left and right sides. In the cord-like support unit 9 (not shown) that supports both ends of the cord-like body 8, the cord-like body 8 extends only to the inside thereof. Therefore, one of the left and right pair of stoppers 18 a and 18 b is attached to the free end of the cord 8.

  The movable locking device 12 of the cable-shaped body locking means 11 includes a swing piece 20 having a cable-shaped body receiving portion 19 at the lower end. The swinging piece 20 has an intermediate position near the lower end by a support shaft 21 laid horizontally between the left and right side plates 15b, 15c at a position slightly above the upper ends of the vertically long holes 17a, 17b. The belt-shaped body receiving portion 19 at the lower end is supported by bending from the left and right sides of the lower end of the belt-shaped plate constituting the rocking piece 20 to the front side. The pair of left and right hook-shaped protrusions 19a is provided, and the portion located between the left and right side plates 15b, 15c of the cord-like body 8 at the high position H is supported by the pair of left and right hook-shaped protrusions 19a.

  The swing detecting swinging body 13 of the cord-like body locking means 11 includes a swinging piece upper half 20a above the support shaft 21 of the swinging piece 20 of the movable locking tool 12, and the swinging piece upper half 20a. And a weight 22 attached to the front side of the upper end of the head. The upper half portion 20a of the swinging piece has a support shaft 21 when the cord-like body receiving portion 19 (the pair of left and right hook-shaped protrusions 19a) at the lower end of the swinging piece locks the cord-like body 8 at the high position H. In this case, the weight 22 is positioned in a vertically upright position, and the stopper pin 23 adjacent to the rear side surface of the swinging piece upper half 20a is located between the left and right side plates 15b and 15c. And a compression coil spring 24 that urges the upper half 20a of the swinging piece in contact with the stopper pin 23 in the rearward direction.

  By the urging force of the compression coil spring 24 and the stopper pin 23, the swinging piece upper half 20a of the swing sensing swinging body 13 is held in a vertical standing posture. As a result, the movable locking device 12 is connected to the lower end of the cord. The rod-shaped body receiving portion 19 (a pair of left and right hook-shaped protrusions 19a) is kept in a posture to lock the cord-shaped body 8 at the high position H. In this state, when the rack 1 is swung beyond the allowable limit due to the occurrence of an earthquake or the like, the swing piece upper half 20a is supported on the support shaft 21 by the inertial force acting on the weight 22 of the swing sensing swing body 13. , The inertial force acting on the weight 22 becomes larger than the urging force of the compression coil spring 24 when it oscillates more than a predetermined angle against the urging force of the compression coil spring 24 around the oscillating piece. The half portion 20a swings forward around the support shaft 21 to the limit position, and as shown in FIG. 5, the cord receiving portion 19 (the pair of left and right hook-shaped projections 19a) at the lower end acts as a cord receiving function. It is configured to switch to a non-acting position separated backward from the position. At this time, an opening 25 is provided in the front plate 15 a of the vertically long groove-shaped main body 15 so that the weight 22 that swings forward can protrude forward from the vertically long casing 14.

  As described above, when the cable-shaped body receiving portion 19 (the pair of left and right hook-shaped protrusions 19a) of the movable locking tool 12 switches from the cable-shaped body receiving operation position to the non-operation position rearward, and the rack 1 swinging. The relationship with the size changes depending on the strength of the initial compression stress of the compression coil spring 24 if the rotation radius of the weight 22, the weight of the weight, the action position of the compression coil spring 24 with respect to the swing piece 20, etc. are constant. It is desirable to configure so that the strength of the initial compressive stress of the compression coil spring 24 can be adjusted. In the illustrated embodiment, a spring pressure adjusting screw 26 is screwed through the front plate 15 a of the vertically long groove-shaped body 15 so as to be movable back and forth, and between the inner end of the spring pressure adjusting screw 26 and the swing piece 20. The compression coil spring 24 is configured to be held.

  According to the above configuration, as shown in FIG. 1 to FIG. 4, each cord 8 is pulled up to a high position H that allows movement of the load W in and out of the load support space 6, and both end portions and intermediate portions thereof are connected. The rack 1 is locked by being hooked by the cord receiving portion 19 (the pair of left and right hook-shaped protrusions 19a) of the movable locking tool 12 in the cord locking means 11 of each cord support unit 9. The loading / unloading operation of the load W with respect to each load support space 6 can be freely performed on the lower side of the cable-shaped body 8. When the rack 1 is swung beyond the allowable limit in the front-rear direction due to the occurrence of an earthquake or the like in the use state of the rack 1, the movable locking member 12 of each cord support unit 9 is In conjunction with the swing to the front side, the cord receiving portion 19 (the pair of left and right hook-shaped protrusions 19a) at the lower end thereof supports the cord-like member that supports the cord-like member 8 from the working position at the high position H. It switches to the non-operation position which leaves | separates from 8 back. As a result, as shown in the phantom line of FIG. 1 and FIGS. 5 and 6, the cord 8 from the high position H to the low position L that prevents the load W from sliding out from the entrance of the load support space 6, It descends by gravity along the elongated holes 17a and 17b in the cord holding means 10 of each cord support unit 9.

  As a result of the above action, the load W that is about to slide to the entrance side of the load support space 6 on the load support frame 3 as the rack 1 swings in the front-rear direction is received by the cords 8 at the low position L. The fall of the load W from the load support space 6 is prevented in advance. At this time, the tension corresponding to the inertial force of the load W to be received acts on the cord-like body 8, and the tension acting on this cord-like body 8 is the cord located on the left and right sides of each load supporting space 6. Out of a pair of left and right stoppers 18a and 18b attached to the rope 8 so as to sandwich the vertically long casing 14 of the body support unit 9 from both left and right sides, the outer stoppers 18a and 18b as viewed from each load support space 6; It is received by the front column 4 of each partition frame 2 of the rack 1 via the vertically long casing 14.

  FIG. 7 shows a modification of the cord-like body locking means 11 shown in the above embodiment. In this modification, the swinging piece 20 of the movable locking tool 12 is at the upper end position in the vertical direction. Is supported by the support shaft 21 so as to be able to swing back and forth, the cord receiving portion 19 is provided at an intermediate position of the swing piece 20, and the swing sensing swing body 13 is supported by the swing piece 20. And a weight 22 attached to the lower end of the swing piece 20. In this modification, the rocking piece 20 maintains a suspended posture by the gravity acting on the weight 22, and when the rocking piece 20 is in the vertical posture in this way, the cord-like body receiving portion 19 is in a high position. When the swinging piece 20 swings forward around the support shaft 21 by a predetermined angle or more as the rack 1 swings in the front-rear direction, the cable-shaped body 8 located at H is supported. The body receiving portion 19 is configured to be switched to a non-operating position where the body receiving portion 19 is detached from the cord-like body 8 at the high position H to the front side.

  Note that the cord receiving portion 19 provided on the movable locking member 12 of the cord locking means 11 supports the cord 8 at the high position H. At this time, the cord The receiving part 19 does not have to support the cord-like body 8 directly. For example, as shown in FIG. 8, an elevating horizontal rod 27 penetrating through a pair of left and right vertically elongated holes 17 a and 17 b of the vertically elongated casing 14 is provided, and the cable-shaped body receiving portion 19 provided in the movable locking tool 12 is provided. Is configured to support the elevating horizontal rod 27, and the pair of left and right stoppers 18a and 18b are attached to both ends of the elevating horizontal rod 27. Then, the inside can be penetrated and fixed to the lifting / lowering horizontal rod 27 by the lock screw 28. Further, when the cord 8 is divided at the position of the cord support unit 9, the free ends of the cord 8 located on both sides of the cord support unit 9 are fixed to the both ends of the lifting / lowering ridges 27, respectively. It can also be configured to.

  When carrying out the present invention, it is possible to prevent the load from falling by one continuous cord-like body 8 with respect to all the load supporting spaces 6 arranged in parallel in the frontage direction at the same height. It is also possible to divide and stretch the cord-like body 8 for each of the plurality of load supporting spaces 6 arranged in parallel. When the width of one load support space 6 in the frontage direction is relatively narrow, only the ends of the cord-like body 8 having a length covering a plurality of load support spaces 6 juxtaposed in the frontage direction are connected to the same. 8 is held by the cord holding means 10 of the cord support unit 9 attached to the rack columns (front column 4 of the partition frame 2) corresponding to both ends, and the cord locking means 11 is engaged at the high position H. It can also be configured to stop. In this case, the rack support column corresponding to the intermediate position of the cord-like body 8 is provided with only the cord-like body holding means 10 that holds the cord-like body 8 between the high position H and the low position L so as to be movable up and down. You can also

  The rack load drop prevention device of the present invention can be used as a means for preventing a load from falling from within the load support space due to the rack shaking in the front-rear direction caused by the occurrence of an earthquake or the like.

DESCRIPTION OF SYMBOLS 1 Rack 2 Partition frame 3 Load support frame 4 Front side support | pillar 6 Load support space 8 Cable body 9 Cable body support unit 10 Cable body holding means 11 Cable body locking means 12 Movable locking tool 13 Shake for shaking detection Moving body 14 Longitudinal casing 17a, 17b Longitudinal long hole 18a, 18b Stopper 19 Cable-shaped body receiving portion 19a A pair of left and right hook-shaped projections 20 Swing piece 20a Swing piece upper half 21 Support shaft 22 Weight 23 Stopper pin 24 Compression coil spring 25 Opening 26 Spring pressure adjusting screw 27 Lifting ridge 28 Lock screw

Claims (6)

A high position that is stretched at the entrance of the load support space of the rack along the opening direction of the load support space and allows loading and unloading movement of the load at the entrance of the load support space; and sliding out of the load from the entrance of the load support space. A cord-like body that can be moved up and down between a low position to be blocked, a cord-like body holding means attached to rack struts on both sides in the frontage direction of the load supporting space, and a cord-like body locking means, The holding means holds at least both ends of the cord-like body so that the cord-like body can only be moved up and down along a vertical straight path between the high position and the low position, and the cord-like body locking means is a cord-like shape in the high position. A movable locking tool detachably engageable with respect to at least both ends of the body and a swinging swinging body for rack swinging are provided. When the sensing rocker swings, the movable locking device In load fall preventing device of the interlocking rack so detached from the wick member in a high position,
The load supporting spaces are partitioned by rack support columns and arranged in parallel in the frontage direction, and the cord-like body has a length stretched across a plurality of parallel load supporting spaces, and is intermediate between the cord-like bodies. At the position , a rack load is attached, which is attached with a stopper that prevents the cord-like body from moving in the length direction relative to the cord-holding means that holds the middle position of the cord-like body. Fall prevention device. A high position that is stretched at the entrance of the load support space of the rack along the opening direction of the load support space and allows loading and unloading movement of the load at the entrance of the load support space; and sliding out of the load from the entrance of the load support space. A cord-like body that can be moved up and down between a low position to be blocked, a cord-like body holding means attached to rack struts on both sides in the frontage direction of the load supporting space, and a cord-like body locking means, The holding means holds at least both ends of the cord-like body so that the cord-like body can only be moved up and down along a vertical straight path between the high position and the low position, and the cord-like body locking means is a cord-like shape in the high position. A movable locking tool detachably engageable with respect to at least both ends of the body and a swinging swinging body for rack swinging are provided. When the sensing rocker swings, the movable locking device In load fall preventing device of the interlocking rack so detached from the wick member in a high position,
The cord-like body holding means includes a vertically long casing that accommodates the cord-like body locking means on the inside, and the left and right side plates of the vertically long casing have the high position in a state where the cord-like body penetrates in the horizontal direction. A vertically long hole that can move up and down with respect to a low position is provided, and the length of the cord-like body is longer than that of the cord-like body holding means that holds an intermediate position of the cord-like body. A stopper that prevents relative movement in the direction is attached, and the movable locking member of the cord-like body locking means is pivotally supported by a horizontally horizontal support shaft in the longitudinal casing so that it can swing back and forth. A rack load drop prevention device configured to be engaged with the high-position cord-like body between the pair of left and right vertically elongated holes . The rack load drop prevention device according to claim 2 , wherein the stoppers are attached to a pair of left and right adjacent to the outside of the left and right side plates of the vertically long casing .   The movable locking member of the cord-like body locking means is provided at a position separated from the support shaft of a swing piece that is pivotally supported so as to be able to swing back and forth by a horizontal horizontal support shaft. The rack swing sensing rocking body comprises a rocking piece of the movable locking tool and a weight attached to the rocking piece at a position away from the support shaft. The weight of the weight is stabilized by gravity or a biasing force of a spring, and when the weight swings around the support shaft in the front-rear direction together with the swing piece, The rack load drop prevention device according to any one of claims 1 to 3, wherein the portion is configured to move to a non-operation position where the portion is detached from the cord-like body.   The swinging piece is pivotally supported by the support shaft so that it can swing back and forth in the middle in the vertical length direction, and the cord receiving portion is provided at the lower end of the swinging piece to swing the rack. The weight of the sensing oscillating body is attached to the upper end of the oscillating piece, and a stopping part for receiving the oscillating piece so that the oscillating piece maintains an upright posture, and the oscillating piece is applied to the stopping part. The rack load drop prevention device according to claim 4, further comprising a spring that is in contact with the rack.   The swing piece is pivotally supported so that the upper end position in the vertical length direction is swingable back and forth by the support shaft, and the cord-like body receiving portion is provided at an intermediate position of the swing piece. The weight of the swing sensing swing body is attached to a lower end of the swing piece, and the swing piece is configured to maintain a suspended posture by gravity acting on the weight. Rack load drop prevention device.

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