A robustly reinforced nestable flow device

Abstract

This invention discloses a robust and reinforced stackable logistics device, including a logistics frame consisting of an upper frame and a lower frame fixed together. The lower frame can be inserted into the upper frame. A sliding groove is formed on the inner side of the side plate of the upper frame, and a sliding strip is fixedly provided on the outer side of the side plate of the lower frame. The sliding strip and the sliding groove are slidably engaged. Multiple locking slots are provided inside the sliding groove, and a locking mechanism is provided at the bottom of the logistics frame. This invention addresses the problems in existing technologies where logistics frames are stacked when holding goods, with the upper logistics frame placed directly on top of the lower one, making accidental movement and tipping of the upper logistics frame easy and resulting in insufficient stacking stability. This invention allows logistics frames to be stacked together when holding goods, and the locking structure makes the stacked logistics frames more robust, preventing the upper logistics frame from directly pressing on the lower goods.

Description

Technical Field

[0001] This invention relates to the field of logistics equipment technology, and more particularly to a robustly reinforced, stackable logistics equipment. Background Technology

[0002] Logistics boxes are widely used in industries such as machinery, automobiles, home appliances, light industry, and electronics for parts turnover, component stacking, and transportation. In practical use, in order to improve the space utilization of logistics boxes, they are generally designed to be stackable.

[0003] In existing technologies, stackable logistics boxes are generally stacked when not in use to reduce space occupation. However, when in use and containing goods, they are usually stacked directly, with the bottom of the upper logistics box placed directly on top of the lower logistics box. For example, in an embedded stackable logistics box with application number 201621296572.X, an asymmetrical locking inner groove is used to allow stacking when not in use, reducing space occupation and improving space utilization. However, when containing goods, the stacking with the upper logistics box placed directly on top of the lower logistics box makes it easy for the upper logistics box to move and tip over due to accidental collision, resulting in an unstable stacking of logistics boxes.

[0004] To address the above technical problems, this invention discloses a robust and reinforced stackable logistics device. This invention has the advantages of allowing logistics frames to be stacked when holding goods, and the interlocking structure makes the stacked logistics frames more robust. At the same time, it can also prevent the upper logistics frame from directly pressing on the lower goods and causing damage to the goods. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a robust and reinforced stackable logistics device to solve the technical problems in the prior art where logistics frames are stacked together when holding goods, with the upper logistics frame placed directly on top of the lower logistics frame. This can easily lead to accidental collisions that cause the upper logistics frame to move and tip over, resulting in insufficient stacking stability. This invention has the advantages of allowing logistics frames to be stacked together when holding goods, and the interlocking structure makes the stacked logistics frames more robust. At the same time, it also avoids the situation where the upper logistics frame directly presses on the lower goods, causing damage to the goods.

[0006] This invention is achieved through the following technical solution: This invention discloses a robust and reinforced stackable logistics device, including a logistics frame, which is formed by an upper frame and a lower frame fixed to each other. The top of the upper frame is provided with an opening, and the lower frame is internally connected to the upper frame. The lower frame can be inserted into the upper frame. The inner side of the side plate of the upper frame is provided with a sliding groove, and the outer side of the side plate of the lower frame is fixedly provided with a sliding strip. The sliding strip and the sliding groove are slidably inserted and engaged. The inside of the sliding groove is provided with a snap-fit ​​groove, and there are multiple snap-fit ​​grooves arranged longitudinally at equal intervals. A snap-fit ​​mechanism is provided at the bottom of the logistics frame. A reinforcing frame is fixedly provided at the top opening of the logistics frame, and a handle is provided at the bottom of the reinforcing frame.

[0007] The locking mechanism includes a base box, a locking block, a limiting sleeve, and a pull rope. The base box is fixedly installed at the bottom of the logistics frame. The locking block is slidably inserted into the side wall of the base box. One end of the locking block extends to the outside of the base box, and the other end of the locking block is located inside the base box. The end of the locking block located outside the base box is inserted into the locking groove. A limiting sleeve is fixedly installed on the inner wall of the base box. The locking block is slidably inserted into the inner hole of the limiting sleeve. A pull rope is fixedly installed at the end of the locking block located inside the base box. The other end of the pull rope extends to the handle. The locking block is controlled by a spring, which is configured to rebound the locking block towards the outside of the base box.

[0008] Furthermore, a positioning plate is fixedly sleeved on the outer part of the snap-fit ​​block located on the limiting sleeve, and a fixing plate is sleeved on one end of the snap-fit ​​block located inside the bottom box. The fixing plate is fixedly connected to the bottom wall of the bottom box, and the snap-fit ​​block and the inner hole of the fixing plate are slidably engaged. A spring is provided between the positioning plate and the fixing plate.

[0009] Furthermore, the handle includes a fixed base, a clearance groove, a control handle, a sliding block, and a sliding groove. The fixed base is fixedly installed at the bottom of the reinforcing frame. A clearance groove is provided at the bottom inside the fixed base. A control handle is installed inside the clearance groove. The two ends of the control handle move up and down inside the clearance groove through the cooperation of the sliding block and the sliding groove, respectively. The other end of the pull rope extends through the outer wall of the bottom box to the outside of the bottom box, and the end of the pull rope outside the bottom box is connected to the bottom wall of the sliding block.

[0010] Furthermore, a triggering mechanism is provided inside and below the bottom box.

[0011] Furthermore, the triggering mechanism includes a trigger plate, a slide rod, and a guide wheel assembly. The trigger plate is located below the base box, close to the bottom of the base box with a gap. The trigger plate can move vertically up and down below the base box via the slide rod. The guide wheel assembly is located inside the base box. One end of the pull rope inside the base box extends to the outside of the base box through the guide wheel assembly. The guide wheel assembly consists of guide wheel one, guide wheel two, and guide wheel three. Guide wheel one is horizontally positioned with the locking block, guide wheel two is located below one side of guide wheel one, and guide wheel three is located... Above the second guide wheel, the first pull rope is guided by the wheel walls of the first, second, and third guide wheels to extend to the outside of the bottom box. The third guide wheel causes the first pull rope to be folded downwards and taut. A fixed rod is sleeved inside the first guide wheel, and the two ends of the fixed rod are fixedly connected to the side wall of the bottom box. The first guide wheel is rotatably connected to the fixed rod, and the third guide wheel is fixedly connected to the bottom box and is rotatable. The second guide wheel is sleeved outside the movable rod, and the second guide wheel is rotatably connected to the movable rod. The movable rod can be moved up and down by the control component.

[0012] Furthermore, a control block is fixedly installed on the upper surface of the trigger plate, and one end of the control block extends through the bottom wall of the bottom box into the interior of the bottom box. The control block is configured as a triggerable control component.

[0013] Furthermore, the control component includes a fixed block, a moving slot, a moving block, a connecting rod, a locking slot, a locking part, and an unlocking part. The fixed block is fixedly installed inside the bottom box and fixedly connected to the top wall of the bottom box. The fixed block has a moving slot inside, and the moving block is slidably installed inside the moving slot. A connecting rod is fixedly installed at the bottom of the moving block, and one end of the connecting rod slides through the bottom wall of the moving slot to the outside of the moving slot and is fixedly connected to the moving rod. A locking slot is installed on the side wall of the moving slot. A locking part is installed inside the moving block, and the locking part and the locking slot cooperate with each other to lock the moving block so that it cannot move up or down. An unlocking part is also installed inside the locking slot.

[0014] Furthermore, the locking groove penetrates the side wall of the moving groove. The locking part includes a movable groove, a through groove, a movable block, a locking block, and a second spring. The movable block has a movable groove inside, and a through groove is provided on one side of the movable groove. The movable groove is connected to the outside through the through groove. The movable block is slidably arranged inside the movable groove. The locking block is slidably arranged laterally inside the through groove, and the locking block is fixedly connected to the movable block. The other end of the locking block extends to the outside of the movable block and is located inside the locking groove. A second spring is provided on the other side of the movable block.

[0015] Furthermore, the unlocking part includes an unlocking block and a limiting slider. The unlocking block is laterally slidably disposed inside the locking groove. The side of the unlocking block facing the locking block is in contact with the locking block, and the other side of the unlocking block extends to the outside of the locking groove. The side of the unlocking block outside the locking groove is an inclined surface. The sliding of the unlocking block is limited by the limiting slider and the limiting slot. The outer wall of the control block is in contact with and slidably engaged with the side of the fixed block on which the unlocking block is disposed.

[0016] Furthermore, a pull rope 2 is fixedly connected to the bottom of the movable rod, and the pull rope 2 extends to the outside of the bottom box through the guide wheel 4. The other end of the pull rope 2 extends to the outer wall of the upper frame through the guide tube. A pull ring is fixedly installed at one end of the pull rope 2 located outside the upper frame. A sleeve rod is also fixedly installed at the upper frame, and the sleeve rod is close to the handle.

[0017] The present invention has the following advantages:

[0018] This invention uses an upper frame and a lower frame to form a logistics frame, allowing the frames to be stacked when not in use, thus reducing space occupation and improving space utilization. Furthermore, a snap-fit ​​mechanism makes the stacked logistics frames more secure. When the logistics frames are loaded with goods, the snap-fit ​​mechanism allows for stacking, and the stacking depth can be adjusted according to the height of the goods. This utilizes the space between the top surface of the goods and the top surface of the logistics frame when the goods are relatively low, reducing the space occupied by the stacked frames and preventing the weight of the upper logistics frame from completely pressing down on the lower goods, which could cause damage. Additionally, a trigger mechanism allows the snap-fit ​​blocks to extend and engage before the bottom surface of the upper logistics frame contacts the lower goods during stacking, ensuring the upper logistics frame is close to and locked in place by the snap-fit ​​blocks above the goods, preventing the lower goods from bearing excessive weight from the upper logistics frame. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram showing the non-overlapping and overlapping states of the logistics frame of the present invention;

[0021] Figure 3 This is a schematic diagram showing the non-overlapping and overlapping states of the logistics frame of the present invention when holding goods;

[0022] Figure 4 For the present invention Figure 1 A magnified schematic diagram of the structure at point B;

[0023] Figure 5 This is a schematic diagram of the internal structure of the bottom box of the present invention;

[0024] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point D;

[0025] Figure 7 For the present invention Figure 1 A magnified schematic diagram of the structure at point A;

[0026] Figure 8 For the present invention Figure 5 A magnified schematic diagram of the structure at point F;

[0027] Figure 9 For the present invention Figure 5 A magnified schematic diagram of the structure at point E;

[0028] Figure 10 This is a schematic diagram of the internal structure of the fixing block of the present invention;

[0029] Figure 11 This is a schematic diagram of the internal moving groove structure of the fixed block of the present invention;

[0030] Figure 12 For the present invention Figure 10 A magnified schematic diagram of the structure at point H;

[0031] Figure 13 This is a schematic cross-sectional view of the movable block structure of the present invention;

[0032] Figure 14 For the present invention Figure 9 A magnified schematic diagram of the structure at point G;

[0033] Figure 15 For the present invention Figure 1 A magnified schematic diagram of the structure at point C.

[0034] In the diagram: 1. Logistics frame; 2. Reinforcing frame; 3. Handle; 4. Slide groove; 5. Slide bar; 6. Snap-fit ​​groove; 7. Snap-fit ​​mechanism; 8. Spring 1; 9. Positioning plate; 10. Fixing plate; 11. Through hole; 12. Rope tube; 13. Triggering mechanism; 14. Fixing rod; 15. Connecting frame; 16. Movable rod; 17. Control block; 18. Control component; 19. Guide wheel 4; 20. Pull rope 2; 21. Pull ring; 22. Sleeve rod; 23. Guide tube; 101. Upper frame; 102. Lower frame; 71. Base box; 72. Snap-fit ​​block; 73. Limiting sleeve; 74. Pull rope 1; 301. Fixing seat 302. Clearance groove; 303. Control handle; 304. Sliding block; 305. Sliding groove; 131. Trigger plate; 132. Slide rod; 133. Guide wheel assembly; 1331. Guide wheel one; 1332. Guide wheel two; 1333. Guide wheel three; 181. Fixed block; 182. Moving groove; 183. Moving block; 184. Connecting rod; 185. Locking groove; 186. Locking part; 187. Unlocking part; 1861. Movable groove; 1862. Through groove; 1863. Movable block; 1864. Locking block; 1865. Spring two; 1871. Unlocking block; 1872. Limit slider. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. In the description of the present invention, words such as "front", "rear", "left", and "right" that indicate orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Example

[0036] Example 1 discloses a robustly reinforced, stackable logistics device, such as Figures 1-15 As shown, this includes logistics baskets, such as Figure 1 and Figure 2 As shown, the logistics frame 1 is specifically composed of an upper frame 101 and a lower frame 102. The upper frame 101 and lower frame 102 are fixedly connected to each other. The top of the upper frame 101 has an opening, and the bottom plate also has an opening. The lower frame 102 is fixedly positioned below the upper frame 101, and its interior communicates with the interior of the upper frame 101 through the opening at the bottom of the upper frame 101. Furthermore, the length and width of the upper frame 101 are both larger than the length and width of the lower frame 102. Specifically, the lower frame 102 can be inserted into the upper frame 101, thus... Figure 2 As shown, when logistics box 1 is idle, multiple logistics boxes 1 can be stacked on top of each other to reduce the space occupied by logistics box 1.

[0037] To facilitate the handling of the logistics box 1, a reinforcing frame 2 is fixedly installed at the top opening of the logistics box 1, and a handle 3 is installed at the bottom of the reinforcing frame 2. The handles 3 are symmetrically arranged on both sides of the logistics box 1, so that the staff can lift and move the logistics box 1 by using the handles 3.

[0038] Furthermore, when transporting goods via logistics frame 1, the goods are placed inside logistics frame 1, and then logistics frame 1 is placed in the vehicle compartment. To maximize the usable space, more logistics frames 1 can be placed within the available space. Therefore, as... Figure 3 As shown, logistics boxes 1 need to be stacked to increase the number of logistics boxes 1 that can be placed. However, due to the presence of goods inside logistics boxes 1, the weight of the upper logistics boxes 1 should not be pressed on the goods. Therefore, logistics boxes 1 cannot be nested and can only be stacked so that the bottom surface of the upper logistics box 1 contacts the top surface of the lower logistics box 1. Thus, when logistics boxes 1 are placed inside goods and need to be stacked, the height of the stacked logistics boxes 1 cannot be reduced because they cannot be nested.

[0039] In practical use, due to the applicability of logistics frame 1, it is used to place various kinds of goods. Different goods have different heights. Therefore, during logistics transportation, the placement height inside logistics frame 1 varies with the height of the goods. When the goods inside logistics frame 1 are relatively low, there is a large space between the top surface of the goods and the top surface of logistics frame 1. To avoid compressing the goods, logistics frames 1 cannot be stacked. When stacked, they are still placed on top of the lower logistics frame 1, thus wasting this space. Therefore, within the effective cargo space, even when the height of the goods is lower than the height of the logistics frames 1, the number of logistics frames 1 that can be placed inside the cargo compartment remains unchanged. In other words, the number of logistics frames 1 that can be placed inside the cargo compartment is not affected by the height of the goods. The number of logistics boxes 1 that can be placed is a fixed value, affected by the height of the goods. For example, when the height of the carriage is 2 meters and the height of logistics box 1 is 50 centimeters, the maximum number of logistics boxes 1 that can be stacked inside the carriage is four. When the height of the goods is 30 centimeters, the placement height inside the logistics box 1 is 30 centimeters. Therefore, 20 centimeters of the height inside the logistics box 1 is wasted. However, when the logistics boxes 1 can be stacked while placing goods, the upper logistics box 1 can have a height of nearly 20 centimeters that can be inserted into the lower logistics box 1. Thus, when two identical logistics boxes 1 are stacked, if they cannot be stacked, the two logistics boxes 1 occupy a height of one meter, while if they can be stacked, the two logistics boxes 1 occupy a height of 80 centimeters. It can be seen that when placing goods, if the logistics boxes 1 can be stacked, the number of logistics boxes 1 that can be stacked inside the carriage can be increased, thereby increasing the amount of goods transported.

[0040] Correspondingly, when transporting different goods, logistics boxes 1 of different heights can be selected according to the height of the goods, thereby increasing the transport capacity of the goods inside the vehicle. However, since there are many types and sizes of goods in logistics transportation, a large number of logistics boxes 1 of different sizes need to be prepared. Preparing logistics boxes 1 of multiple sizes will increase costs, and the logistics boxes 1 occupy a large space when idle. Logistics boxes 1 of multiple sizes will occupy a large warehouse.

[0041] Therefore, configuring the logistics frame 1 as a stackable and non-overlapping logistics frame that directly presses on the goods below increases transport capacity and prevents fragile goods, such as glass products, from being crushed. Specifically, for example... Figure 1 and Figure 4As shown, a sliding groove 4 is provided on the inner side of the side plate of the upper frame 101. At least two sliding grooves 4 are provided on a single side plate. In this embodiment, four sliding grooves 4 are provided, and the four sliding grooves 4 are respectively located on the inner side of two symmetrical side plates. A sliding strip 5 is fixedly provided on the outer side of the side plate of the lower frame 102. The number of sliding strips 5 is the same as that of the sliding grooves 4, and the sliding strips 5 and the sliding grooves 4 are slidably inserted into each other. More specifically, when two logistics boxes 1 are stacked, the sliding strips 5 can be inserted into the sliding grooves 4, thereby limiting the two stacked logistics boxes 1 through the cooperation of the sliding strips 5 and the sliding grooves 4, making the stacked logistics boxes 1 more stable. In addition, a snap-fit ​​groove is provided inside the sliding groove 4. 6. Multiple snap-fit ​​slots 6 are provided, and the multiple snap-fit ​​slots 6 are arranged longitudinally at equal intervals. A snap-fit ​​mechanism 7 is provided at the bottom of the logistics frame 1. By setting up the snap-fit ​​mechanism 7 and the snap-fit ​​slots 6, when two logistics frames 1 are stacked, the snap-fit ​​mechanism 7 and the snap-fit ​​slots 6 can cooperate to limit the stacking position. Thus, when transporting goods, after the goods are placed inside the logistics frame 1 and the height of the goods is lower than the top surface of the logistics frame 1, the lower frame 102 of the upper logistics frame 1 is inserted into the upper frame 101 of the lower logistics frame 1, and the snap-fit ​​mechanism 7 limits the position, so as to prevent the upper logistics frame 1 from directly pressing on the goods inside the lower logistics frame 1 and causing damage to the goods.

[0042] Specifically, such as Figure 1 , Figure 4 ... Figure 5 and Figure 6As shown, the locking mechanism 7 includes a base box 71, locking blocks 72, a limiting sleeve 73, and a pull rope 74. The base box 71 is fixedly installed at the bottom of the logistics frame 1. Locking blocks 72 are slidably inserted into the side wall of the base box 71. The number and position of the locking blocks 72 correspond to the slide bar 5. One end of the locking block 72 extends through the slide bar 5 to the outside of the base box 71, while the other end of the locking block 72 is located inside the base box 71. The end of the locking block 72 located outside the base box 71 engages with the locking groove 6. To ensure more stable sliding of the locking block 72, a limiting sleeve 73 is fixedly installed on the inner wall of the base box 71. One end of the locking block 72, located inside the base box 71, extends through the inner hole of the limiting sleeve 73 into the interior of the base box, and the locking block 72 slidably engages with the inner hole of the limiting sleeve 73. The limiting sleeve 73 further stabilizes the sliding of the locking block 72. To facilitate control of the locking block 72, a pull rope 74 is fixedly installed at one end of the locking block 72 located inside the base box 71. The other end of 4 extends to handle 3. Additionally, the locking block 72 is controlled by spring 8, which is specifically configured to rebound the locking block 72 outwards from the bottom box 71. Therefore, when the logistics frame 1 needs to be stacked, the operator can pull the locking block 72 towards the inside of the bottom box 71 using the pull cord 74 at handle 3, causing the end of the locking block 72 located outside the bottom box 71 to retract into the bottom box 71. Then, the lower frame 102 of the logistics frame 1 is inserted into the upper frame 101 of the lower logistics frame 1. When the goods are in contact, the staff can release the pull rope 74. The spring 8 will cause the locking block 72 to move outward and insert into the locking groove 6, thereby limiting the movement of the logistics frame 1 and preventing the weight of the logistics frame 1 from pressing completely on the goods below. In addition, the locking block 72 and the locking groove 6 allow the logistics frames 1 to be stacked even when they are loaded with goods. The stacked logistics frames 1 are more secure and prevent the upper logistics frame 1 from sliding, tipping and falling due to accidental contact.

[0043] More specifically, the snap-fit ​​block 72 is fixedly sleeved with the positioning plate 9 on the outer part of the limiting sleeve 73, and the snap-fit ​​block 72 is sleeved with the fixing plate 10 on one end inside the bottom box 71. The fixing plate 10 is fixedly connected to the bottom wall of the bottom box 71, and the snap-fit ​​block 72 slides with the inner hole of the fixing plate 10. In addition, a spring 8 is provided between the positioning plate 9 and the fixing plate 10. The spring 8 rebounds the snap-fit ​​block 72 toward the outside of the bottom box 71, so that the positioning plate 9 is in contact with one end of the limiting sleeve 73. When the operator pulls the pull rope 74, the pull rope 74 pulls the snap-fit ​​block 72 toward the inside of the bottom box 71. The positioning plate 9 moves with the snap-fit ​​block 72 and compresses the spring 8, so that when the pull rope 74 is released, the snap-fit ​​block 72 can automatically move toward the outside of the bottom box 71 and insert into the snap-fit ​​groove 6 through the action of the spring 8.

[0044] In addition, to make the pull rope 74 easier to pull, such as Figure 7 As shown, the handle 3 is configured to include a fixed base 301, a clearance groove 302, a control handle 303, a sliding block 304, and a sliding groove 305. The fixed base 301 is fixedly mounted at the bottom of the reinforcing frame 2. A clearance groove 302 is formed inside the lower part of the fixed base 301. The control handle 303 is disposed inside the clearance groove 302, and sliding blocks 304 are fixedly mounted at both ends of the control handle 303. Sliding grooves 305 are formed on the inner walls of both ends of the clearance groove 302. The sliding blocks 304 are inserted into and slidably engaged within the sliding grooves 305. The arrangement of the sliding blocks 304 and the sliding grooves 305 enables the control handle to slide smoothly. The lever 303 can move up and down inside the clearance groove 302, and the other end of the pull rope 74 extends through the outer wall of the bottom box 71 to the outside of the bottom box 71. The end of the pull rope 74 located outside the bottom box 71 extends through the bottom wall of the sliding groove 305 to the inside of the sliding groove 305. The end of the pull rope 74 located inside the sliding groove 305 is fixedly connected to the bottom wall of the sliding block 304. It should be noted that one end of the pull rope 74 can also be connected to the control handle 303. Therefore, when lifting the logistics box 1, the operator can grasp the control handle 303 to move the control handle 303 upward, thereby pulling the pull rope 74.

[0045] Since the pull rope 74 is located outside the logistics frame 1, and the lower frame 102 needs to be inserted into the upper frame 101, in order to avoid the pull rope 74 affecting the stacking of the logistics frames 1, such as Figure 1 and Figure 8 As shown, a through hole 11 is provided inside the slider 5 along the length direction. One end of the pull rope 74 located outside the logistics frame 1 extends from the through hole 11 of the slider 5 to the upper frame 101. A rope tube 12 is fixedly provided on the outer wall of the upper frame 101, so that the pull rope 74 can extend to the handle 3 through the through hole 11 and the rope tube 12, avoiding the pull rope 74 being directly exposed outside the lower frame 102, which would affect the stacking and the pulling of the pull rope 74.

[0046] It should be noted that, since the upper frame 101 has two symmetrical side plates with sliding grooves 4 and two sliding grooves 4 on each side plate, the lower frame 102 and the side plate corresponding to the upper frame 101 are also provided with two sliding strips 5. In order to improve the load-bearing strength of the locking block 72 on the logistics box 1, at least two locking blocks 72 are provided on a single side of the logistics box 1, and the number of locking blocks 72 on a single side is the same as the number of sliding strips 5. In this embodiment, the number of sliding strips 5 on a single side plate is two, and the corresponding number of sliding grooves 4 and locking blocks 72 on a single side plate is two. The pull ropes 74 of the two locking blocks 72 extend to the sliding blocks 304 at both ends of the control handle 303 for connection. The pull ropes 74 of the two locking blocks 72 on the symmetrical side plate are connected to the sliding blocks 304 of the symmetrical side plate. Thus, when lifting the logistics box 1, the operator can hold the handle 3 with both hands and retract the four locking blocks 72 into the bottom box 71.

[0047] Therefore, when goods are inside the logistics box 1, the worker first lifts the logistics box 1 by using handle 3. After lifting the logistics box 1, the grip causes the control handle 303 to move upward. The control handle 303 then moves the locking block 72 via the pull rope 74, causing the locking block 72 to retract into the bottom box 71. Thus, without the obstruction of the locking block 72, the logistics box 1 can be smoothly inserted into the lower logistics box 1. When the logistics box 1 contacts the goods, the worker can release the control handle 303. The rebound of the spring 8 causes the locking block 72 to automatically move towards the outside of the bottom box 71. This allows the snap-fit ​​block 72 to be inserted into the snap-fit ​​groove 6, thereby limiting the stacked logistics frames 1. The snap-fit ​​block 72 supports the upper logistics frame 1, preventing the weight of the logistics frame 1 from being completely pressed on the bottom goods. Furthermore, it allows the logistics frames 1 to still be stacked even when they are loaded with goods, and the stacking depth can be adjusted according to the height of the goods to increase the number of stacked logistics frames 1. It should be noted that in order to improve the strength of the snap-fit ​​groove 6, a metal edging can be provided at the snap-fit ​​groove 6 to prevent the snap-fit ​​groove 6 from deforming. Correspondingly, the snap-fit ​​block 72 can also be made of lightweight metal material.

[0048] When stacking logistics boxes 1 with goods inside, the staff can only perceive the height of the goods when the upper logistics box 1 comes into contact with the goods below. Then, the locking block 72 extends to lock the goods in place. When the upper logistics box 1 comes into contact with the goods below, the goods below will bear the weight of the upper logistics box 1. And after the upper logistics box comes into contact with the goods below, the goods below will bear a large force from the upper logistics box. Therefore, the goods below may be easily crushed. Therefore, before the upper logistics box 1 comes into contact with the goods below, the upper logistics box 1 should be limited by the locking block 72 above the top surface of the goods below to prevent the weight of the upper logistics box 1 from pressing on the goods below.

[0049] Therefore, as Figure 1 As shown, a triggering mechanism 13 is provided inside and below the bottom box 71. By setting the triggering mechanism 13, when the upper logistics box 1 approaches the lower goods, it can be limited by the locking block 72 before the upper logistics box 1 contacts the lower goods, thereby preventing the weight of the upper logistics box 1 from pressing on the lower goods.

[0050] Specifically, such as Figure 1 , Figures 5-9 As shown, the triggering mechanism 13 includes a trigger plate 131, a slide rod 132, and a guide wheel assembly 133. The trigger plate 131 is disposed at the bottom of the base box 71, and the trigger plate 131 is close to the bottom of the base box 71 with a gap. In this embodiment, the gap between the trigger plate 131 and the bottom of the base box 71 is the height of five snap-fit ​​slots 6. The slide rod 132 is fixedly disposed on the upper end surface of the trigger plate 131, and the slide rod 132 slides and inserts into the bottom wall of the base box 71. Therefore, the trigger plate 131... Located below the base box 71 and movable vertically, the guide wheel assembly 133 is disposed inside the base box 71. One end of each pull rope 74 inside the base box 71 extends to the outside of the base box 71 via the guide wheel assembly 133. The guide wheel assembly 133 specifically consists of guide wheel 1331, guide wheel 1332, and guide wheel 1333. Guide wheel 1331 is horizontally positioned with the locking block 72, guide wheel 1332 is positioned below one side of guide wheel 1331, and guide wheel 1333... 33 is positioned above guide wheel 1332. Pull rope 74 extends from the upper wall of guide wheel 1331 to the lower wall of guide wheel 1332, then from the lower wall of guide wheel 1332 to the upper wall of guide wheel 1333, and finally from the upper wall of guide wheel 1333 to the outside of the base box 71. Guide wheel 1333 tensions pull rope 74 and causes one section of pull rope 74 to fold downwards. Additionally, a fixing rod 14 is fitted inside guide wheel 1331. Both ends of the fixed rod 14 are fixedly connected to the side wall of the bottom box 71. The first guide wheel 1331 is rotatably connected to the fixed rod 14, while the third guide wheel 1333 is fixedly connected to the bottom box 71. The third guide wheel 1333 is fixedly connected to the top wall of the bottom box 71 through the connecting bracket 15, and the third guide wheel 1333 is set to be rotatable. The second guide wheel 1332 is sleeved on the outside of the movable rod 16, and the second guide wheel 1332 is rotatably connected to the movable rod 16. The movable rod 16 can move up and down through the control component 18.

[0051] More specifically, a control block 17 is fixedly installed on the upper surface of the trigger plate 131, and one end of the control block 17 extends through the bottom wall of the bottom box 71 into the interior of the bottom box 71. The control block 17 is configured to trigger the control component 18. Specifically, the upward movement of the control block 17 can unlock the control component 18, causing the movable rod 16 to move up and down. Thus, when the worker lifts the logistics box 1 for stacking, when the worker grasps the control handle 303, the pull rope 74 is pulled, causing the locking block 72 to retract into the bottom box 71. At this time, the spring 8 is compressed, and the pull rope 74 is taut. When the movable rod 16 can move up and down, the rebound force of the spring 8 will cause the pull rope 74 to automatically move the movable rod 16 and the guide wheel 1332 upward. Therefore, without the guide wheel 133... When the pull rope 74 is pressed down, the folded section formed by the pull rope 74 being pressed down by the guide wheel 1332 will flatten out. Therefore, the locking block 72 will move towards the outside of the bottom box 71 and insert into the locking groove 6. Therefore, when the logistics box 1 is stacked, when the trigger plate 131 contacts the goods below, the trigger plate 131 will not be able to move down due to the obstruction of the goods. When the logistics box 1 continues to move down, the control block 17 will move up relative to the bottom box 71, thereby triggering the control component 18, causing the control component 18 to unlock, and the locking block 72 to extend and lock. This allows the locking block 72 to extend and lock the logistics box 1 when the logistics box 1 is close to the goods below but before contacting the goods below. The setting of the trigger plate 131 can reduce the load on the goods below.

[0052] like Figure 5 , Figure 6 , Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown, the control component 18 includes a fixed block 181, a moving groove 182, a moving block 183, a connecting rod 184, a locking groove 185, a locking part 186, and an unlocking part 187. The fixed block 181 is fixedly disposed inside the base box 71 and fixedly connected to the top wall of the base box 71. The fixed block 181 has a moving groove 182 inside, and the moving block 183 is disposed inside the moving groove 182. The moving block 183 can slide up and down inside the moving groove 182. The outer wall of the moving block 183 is flush with the inner wall of the moving groove 182. The moving block 183 is fitted with the wall and slides together. A connecting rod 184 is fixedly provided at the bottom of the moving block 183. One end of the connecting rod 184 slides through the bottom wall of the moving groove 182 and extends to the outside of the moving groove 182 and is fixedly connected to the movable rod 16. A locking groove 185 is provided on the side wall of the moving groove 182. A locking part 186 is provided inside the moving block 183. The locking part 186 and the locking groove 185 cooperate with each other to lock the moving block 183 and prevent it from moving up and down. In addition, an unlocking part 187 is also provided inside the locking groove 185.

[0053] Specifically, the locking groove 185 penetrates the side wall of the moving groove 182, and the locking part 186 specifically includes a movable groove 1861, a through groove 1862, a movable block 1863, a locking block 1864, and a spring 1865. The movable block 183 has a movable groove 1861 inside, and a through groove 1862 is formed on one side of the movable groove 1861, penetrating the side wall of the movable block 183. This allows the movable groove 1861 to communicate with the outside through the through groove 1862. The inner diameter of the through groove 1862 is smaller than the inner diameter of the movable groove 1861. The movable block 1863 is slidably disposed inside the movable groove 1861, and can slide laterally inside the movable groove 1861. The locking block 1864 is slidably disposed laterally inside the through groove 1862. One end of the locking block 1864 is fixedly connected to the movable block 1863, and the other end of the locking block 1864 extends to the outside of the movable block 183 and the inside of the locking groove 185. A second spring 1865 is provided on the other side of the movable block 1863. The second spring 1865 causes the movable block 1863 to rebound towards the through groove 1862. Therefore, when the movable block 183 moves up and down inside the movable groove 182, when the locking part 186 moves to the locking groove 185, the locking block 1864 will be inserted into the locking groove 185 by the elastic force of the second spring 1865 to limit the movable block 183, so that the movable block 183 cannot move up and down, thereby preventing the movable rod 16 and the second guide wheel 1332 from moving longitudinally.

[0054] The unlocking part 187 includes an unlocking block 1871 and a limiting slider 1872. The unlocking block 1871 is inserted into the interior of the locking groove 185. The outer wall of the unlocking block 1871 is fitted and slidably engaged with the inner wall of the locking groove 185. The unlocking block 1871 is configured to slide laterally within the locking groove 185. The side of the unlocking block 1871 facing the locking block 1864 is fitted with the locking block 1864, and the other side of the unlocking block 1871 extends to the outside of the locking groove 185. The side of the unlocking block 1871 outside the locking groove 185 is a slope, and the unlocking block 1871 is wider at the top and narrower at the bottom. The sliding of the unlocking block 1871 is limited by the limiting slider 1872. A limiting slot is formed in the bottom wall of the locking groove 185, and the limiting slider 1872 is inserted into the limiting slot to limit the sliding of the unlocking block 1871. Additionally, as... Figure 9As shown, the outer wall of the control block 17 is in contact with and slides against the side of the fixed block 181 where the unlocking block 1871 is located. When the control block 17 moves upward, the control block 17 will contact the inclined surface of the unlocking block 1871. The upward movement of the control block 17 through the inclined surface controls the unlocking block 1871 to move laterally toward the interior of the fixed block 181. This allows the unlocking block 1871 to push the locking block 1864 into the interior of the through slot 1862, allowing the moving block 183 to move up and down without the limitation of the locking block 1864. This allows the movable rod 16 to move up and down. Therefore, when the trigger plate 131 contacts the goods, the pressure on the goods includes the weight of the trigger plate 131 and the force of the trigger plate 131 moving upward and pushing the unlocking block 1871 laterally. This prevents the goods from bearing the weight of the upper logistics frame 1 and reduces the load on the lower goods.

[0055] Additionally, it should be noted that in this embodiment, the displacement length required for the control block 17 to move upward so that the unlocking block 1871 fully enters the locking groove 185 is the height of two locking grooves 6. Therefore, in this embodiment, when the trigger plate 131 contacts the goods, the distance between the trigger plate 131 and the bottom of the upper logistics frame 1 is the height of five locking grooves 6. After the trigger plate 131 moves upward so that the locking block 1864 retracts into the through groove 1862, the distance between the bottom of the upper logistics frame 1 and the trigger plate 131 is the height of three locking grooves 6. Then, the spring 8 rebounds, causing the pull rope 74 to... The box is flattened, allowing the locking block 72 to extend. When the locking block 72 extends, it engages with the locking slot 6 for a limited stop. When the locking block 72 and the locking slot 6 are misaligned, the staff can move the logistics box 1 up one position, and the locking block 72 will be inserted into the locking slot 6. This allows the upper logistics box 1 to be on top of the lower goods and close to each other. This enables the logistics boxes 1 to be stacked when they are loaded with goods, making the stacking of the logistics boxes 1 more secure during transportation, reducing the stacking height, increasing the transportation capacity, and preventing the goods from being damaged by excessive weight.

[0056] After the stacking is completed, the worker releases handle 3. At this time, control handle 303 moves downward under its own weight. Since the locking block 72 has been inserted into the locking slot 6, the pull rope 74 will also become slack. Later, during unloading, when the logistics box 1 needs to be lifted, the worker will be unable to control the movement of the locking block 72 by pulling the pull rope 74 using control handle 303. Therefore, if... Figure 1 , Figure 14 and 15As shown, a pull rope 20 is fixedly connected to the bottom of the movable rod 16, and the pull rope 20 extends to the outside of the bottom box 71 through the guide wheel 19. A guide tube 23 is provided on the outer wall of the logistics frame 1, and the other end of the pull rope 20 extends to the outer wall of the upper frame 101 through the guide tube 23. A pull ring 21 is fixedly provided at the end of the pull rope 20 outside the upper frame 101, and a sleeve rod 22 is also fixedly provided at the upper frame 101. After the logistics frames 1 are stacked, the operator can pull the pull rope 20 by releasing the control handle 303, so that the movable rod 16 moves down through the pull ring 21. The movable rod 16 will drive the guide wheel 1332 to move down, and the connecting rod 184 will also drive the moving block 183 to move down. At this time, since the control block 17 is located on the side wall of the fixed block 181, the unlocking block 1871 will be in the locking groove. Inside 185, the locking block 1864 cannot enter the locking groove 185. Therefore, the operator can attach the pull ring 21 to the sleeve rod 22, so that the position of the guide wheel 1332 can be limited and fixed by the pull ring 21 and the sleeve rod 22. It should be noted that when the pull ring 21 is attached to the sleeve rod 22, the pull rope 20 will cause the moving block 183 to move to the bottom of the moving groove 182, and the guide wheel 1332 will press down again to fold and tighten the pull rope 74. The sleeve rod 22 is close to the handle 3, so that when the operator grips the control handle 303, it is easy to separate the pull ring 21 from the sleeve rod 22 with their fingers. The pressing down of the guide wheel 1332 will cause the pull rope 74 to be tightened again. Then, the operator grips the control handle 303 to pull the pull rope 74, thereby causing the locking block 72 to retract. Then, the logistics box 1 can be pulled out for unloading.

[0057] The principle of this invention is as follows: When in use, since the logistics box 1 is placed on the ground, the trigger plate 131 at the bottom of the logistics box 1 will contact the bottom wall of the logistics box 1. Therefore, the control block 17 will also push the unlocking block 1871 into the locking groove 185, making it impossible for the locking block 1864 to be inserted into the locking groove 185. At this time, the moving block 183 cannot be positioned, and therefore, the guide wheel 1332 and the movable rod 16 also cannot be positioned. At this time, the pull ring 21 can be pulled to engage with the sleeve rod 22, from which... Maintaining the position of guide wheel 1332, which presses down and folds pull rope 74 while keeping it taut, the operator then lifts the logistics box 1 by gripping handle 3. At this time, control handle 303 drives pull rope 74 to pull locking block 72, causing locking block 72 to retract into the bottom box 71. As the logistics box 1 is lifted, trigger plate 131 will fall due to its own weight, causing control block 17 to move down and separate from unlocking block 1871, thus failing to block unlocking block 1871. At this time, locking block 1864 will spring back... Spring 1865 is inserted into the locking groove 185 and pushes out the unlocking block 1871. After the trigger plate 131 falls, the locking block 1864 is inserted into the locking groove 185. The operator can use their fingers to move the pull ring 21 to separate it from the sleeve rod 22. Then, the logistics frame 1 is stacked. When the bottom of the logistics frame 1 is close to the goods below, the trigger plate 131 will first contact the bottom goods. As the logistics frame 1 moves down, the control block 17 will gradually contact the unlocking block 1871 and push the unlocking block 1871 into the locking groove. Inside 185, the locking block 1864 is squeezed into the through groove 1862. The locking block 1864 cannot limit the movement block 183. Then, through the elastic force of the spring 8, the movable rod 16 moves upward and the guide wheel 1332 moves upward, causing the pull rope 74 to flatten. Thus, the locking block 72 is inserted into the locking groove 6 for locking and limiting. Before the bottom surface of the logistics frame 1 contacts the goods below, the locking block 72 extends and locks through the contact of the trigger plate 131, preventing the goods below from bearing a large weight of the logistics frame 1 above.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A robustly reinforced nestable logistics appliance comprising a logistics frame (1), characterized in that, The logistics frame (1) is formed by fixing an upper frame (101) and a lower frame (102) together. The upper frame (101) has an opening at the top and the lower frame (102) is connected to the interior of the upper frame (101). The lower frame (102) can be inserted into the interior of the upper frame (101). The inner side of the side plate of the upper frame (101) is provided with a sliding groove (4). The outer side of the side plate of the lower frame (102) is fixedly provided with a sliding strip (5). The sliding strip (5) and the sliding groove (4) are slidably inserted and engaged. The sliding groove (4) is provided with a snap-fit ​​groove (6), and there are multiple snap-fit ​​grooves (6). The snap-fit ​​grooves (6) are arranged longitudinally at equal intervals. The bottom of the logistics frame (1) is provided with a snap-fit ​​mechanism (7). The top opening of the logistics frame (1) is fixedly provided with a reinforcing frame (2). The bottom of the reinforcing frame (2) is provided with a handle (3). The snap-fit ​​mechanism (7) includes a bottom box (71), a snap-fit ​​block (72), a limiting sleeve (73), and a pull rope (74). The bottom box (71) is fixedly installed at the bottom of the logistics frame (1). The snap-fit ​​block (72) is slidably inserted into the side wall of the bottom box (71). One end of the snap-fit ​​block (72) extends to the outside of the bottom box (71), and the other end of the snap-fit ​​block (72) is located inside the bottom box (71). The end of the snap-fit ​​block (72) located outside the bottom box (71) is inserted into the snap-fit ​​groove (6). With the connection, a limiting sleeve (73) is fixedly provided on the inner wall of the bottom box (71), and the snap-fit ​​block (72) slides into the inner hole of the limiting sleeve (73). One end of the snap-fit ​​block (72) located inside the bottom box (71) is fixedly provided with a pull rope (74), and the other end of the pull rope (74) extends to the handle (3). The snap-fit ​​block (72) is controlled by a spring (8), and the spring (8) is configured to bounce the snap-fit ​​block (72) towards the outside of the bottom box (71).

2. The robustly reinforced, stackable logistics device as described in claim 1, characterized in that, The snap-fit ​​block (72) is fixedly sleeved with a positioning plate (9) on the outer part of the limiting sleeve (73). The snap-fit ​​block (72) is sleeved with a fixing plate (10) on one end inside the bottom box (71). The fixing plate (10) is fixedly connected to the bottom wall of the bottom box (71). The snap-fit ​​block (72) slides with the inner hole of the fixing plate (10). A spring (8) is provided between the positioning plate (9) and the fixing plate (10).

3. A robustly reinforced, stackable logistics device as described in claim 2, characterized in that, The handle (3) includes a fixed seat (301), a clearance groove (302), a control handle (303), a sliding block (304), and a sliding groove (305). The fixed seat (301) is fixedly installed at the bottom of the reinforcing frame (2). The clearance groove (302) is provided at the bottom inside the fixed seat (301). The control handle (303) is provided inside the clearance groove (302). The two ends of the control handle (303) move up and down inside the clearance groove (302) through the cooperation of the sliding block (304) and the sliding groove (305). The other end of the pull rope (74) extends through the outer wall of the bottom box (71) to the outside of the bottom box (71). The end of the pull rope (74) located outside the bottom box (71) is connected to the bottom wall of the sliding block (304).

4. A robustly reinforced, stackable logistics device as described in claim 3, characterized in that, A triggering mechanism (13) is provided inside and below the bottom box (71).

5. A robustly reinforced, stackable logistics device as described in claim 4, characterized in that, The triggering mechanism (13) includes a trigger plate (131), a slide rod (132), and a guide wheel assembly (133). The trigger plate (131) is located below the bottom box (71), and is close to the bottom of the bottom box (71) with a gap. The trigger plate (131) can move vertically up and down below the bottom box (71) via the slide rod (132). The guide wheel assembly (133) is located inside the bottom box (71). One end of the pull rope (74) located inside the bottom box (71) extends to the outside of the bottom box (71) through the guide wheel assembly (133). The guide wheel assembly (133) consists of guide wheel one (1331), guide wheel two (1332) and guide wheel three (1333). Guide wheel one (1331) is horizontally arranged with the snap-fit ​​block (72). Guide wheel two (1332) is arranged below one side of guide wheel one (1331). Guide wheel three... (1333) is positioned above guide wheel two (1332). The pull rope one (74) is guided by the wheel walls of guide wheel one (1331), guide wheel two (1332) and guide wheel three (1333) to extend to the outside of the bottom box (71). The guide wheel three (1333) causes one section of the pull rope one (74) to be folded downwards and tensioned. A fixing rod (14) is sleeved inside the guide wheel one (1331), and both ends of the fixing rod (14) are connected to the bottom box (71). 1) The side wall is fixedly connected, the first guide wheel (1331) is rotatably connected to the fixed rod (14), the third guide wheel (1333) is fixedly connected to the bottom box (71), and the third guide wheel (1333) is rotatable. The second guide wheel (1332) is sleeved on the outside of the movable rod (16), and the second guide wheel (1332) is rotatably connected to the movable rod (16). The movable rod (16) can move up and down through the control component (18).

6. A robustly reinforced, stackable logistics device as described in claim 5, characterized in that, A control block (17) is fixedly provided on the upper surface of the trigger plate (131), and one end of the control block (17) extends through the bottom wall of the bottom box (71) into the interior of the bottom box (71). The control block (17) is configured as a triggerable control component (18).

7. A robustly reinforced, stackable logistics device as described in claim 6, characterized in that, The control component (18) includes a fixed block (181), a moving groove (182), a moving block (183), a connecting rod (184), a locking groove (185), a locking part (186), and an unlocking part (187). The fixed block (181) is fixedly disposed inside the bottom box (71) and fixedly connected to the top wall of the bottom box (71). The moving groove (182) is provided inside the fixed block (181), and the moving block (183) is slidably disposed inside the moving groove (182). The bottom of the moving block (183) is fixedly disposed. There is a connecting rod (184), and one end of the connecting rod (184) slides through the bottom wall of the moving groove (182) and extends to the outside of the moving groove (182) and is fixedly connected to the movable rod (16). The side wall of the moving groove (182) is provided with a locking groove (185). The moving block (183) is provided with a locking part (186) inside. The locking part (186) and the locking groove (185) cooperate with each other to lock the moving block (183) so that it cannot move up and down. The locking groove (185) is also provided with an unlocking part (187).

8. A robustly reinforced, stackable logistics device as described in claim 7, characterized in that, The locking groove (185) penetrates the side wall of the moving groove (182). The locking part (186) includes a movable groove (1861), a through groove (1862), a movable block (1863), a locking block (1864), and a second spring (1865). The movable block (183) has a movable groove (1861) inside, and a through groove (1862) is provided on one side of the movable groove (1861). The movable groove (1861) is connected to the through groove (1862) inside. Externally connected, a movable block (1863) is slidably disposed inside the movable groove (1861), a locking block (1864) is slidably disposed laterally inside the through groove (1862), and the locking block (1864) is fixedly connected to the movable block (1863). The other end of the locking block (1864) extends to the outside of the movable block (183) and is located inside the locking groove (185). A second spring (1865) is disposed on the other side of the movable block (1863).

9. A robustly reinforced, stackable logistics device as described in claim 8, characterized in that, The unlocking part (187) includes an unlocking block (1871) and a limiting slider (1872). The unlocking block (1871) is laterally slidably disposed inside the locking groove (185). The side of the unlocking block (1871) facing the locking block (1864) is in contact with the locking block (1864). The other side of the unlocking block (1871) extends to the outside of the locking groove (185). The side of the unlocking block (1871) outside the locking groove (185) is an inclined surface. The sliding of the unlocking block (1871) is limited by the limiting slider (1872) and the limiting slot. The outer wall of the control block (17) is in contact with and slidably engaged with the side of the fixed block (181) on which the unlocking block (1871) is disposed.

10. A robustly reinforced, stackable logistics device as described in claim 9, characterized in that, The bottom of the movable rod (16) is fixedly connected to a pull rope two (20), and the pull rope two (20) extends to the outside of the bottom box (71) through the guide wheel four (19). The other end of the pull rope two (20) extends to the outer wall of the upper frame (101) through the guide tube (23). A pull ring (21) is fixedly provided at one end of the pull rope two (20) outside the upper frame (101). A sleeve rod (22) is also fixedly provided at the upper frame (101). The sleeve rod (22) is close to the handle (3).

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