Lift hook and method of transporting articles using lift hook

Abstract

The lifting hook has a main plate, first and second sliding plates, first and second bases, a pair of lifting hooks, a generator, and a rack. The first sliding plate and the second sliding plate are configured so as to be suspended from the radio remote control unmanned aerial vehicle, and are configured so as to be fixed to each other and slide up and down relative to the main plate while sandwiching the main plate. The first base and the second base are fixed to each other and slide up and down relative to the main board in a state of clamping the main board. The pair of lifting hooks is rotatably connected to the first base and the second base respectively. The generator is fixed to the mainboard. The rack is connected with the generator and fixed to the first sliding plate.

Description

Technical Field

[0001] One embodiment of the present invention relates to a sling for transporting an object by hanging it on a radio-controlled unmanned aerial vehicle (hereinafter also referred to as a drone), and a method for transporting the object using the sling. Background Art

[0002] In recent years, drones have been widely used in various fields. They can not only be used for aerial photography, but also as a tool for transporting goods, materials, etc. For example, in Patent Documents 1 to 5, a hoist (hereinafter referred to as a hoist hook) for transporting goods using a drone is disclosed.

[0003] (Prior art literature)

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-128455

[0006] Patent Document 2: Japanese Patent Application Publication No. 2022-128632

[0007] Patent Document 3: Japanese Patent Application Publication No. 2021-050064

[0008] Patent Document 4: Japanese Patent Application Publication No. 2021-102521

[0009] Patent Document 5: Japanese Patent Application Publication No. 2022-128628 Summary of the invention

[0010] (Problems to be solved by the invention)

[0011] One of the tasks of one embodiment of the present invention is to provide a lifting hook with a novel structure and a method for transporting items using the lifting hook. Alternatively, one of the tasks of one embodiment of the present invention is to provide a lifting hook that can prevent items from falling even when a drone unexpectedly drops, and a method for transporting items using the lifting hook.

[0012] (Measures taken to solve the problem)

[0013] One embodiment of the present invention is a lifting hook. The lifting hook has a main board, a first sliding plate and a second sliding plate, a first base and a second base, a pair of hooks, a generator, and a rack. The first sliding plate and the second sliding plate are configured to be suspended from a radio-controlled unmanned aerial vehicle and are configured to be fixed to each other and slide up and down relative to the main board in a state of clamping the main board. The first base and the second base are configured to be fixed to each other and slide up and down relative to the main board in a state of clamping the main board. A pair of hooks are rotatably connected to the first base and the second base, respectively. The generator is fixed to the main board. The rack is connected to the generator and fixed to the first sliding plate.

[0014] One embodiment of the present invention is a method for transporting an object. The method includes the steps of hanging the object on a lifting hook, moving the lifting hook using a radio-controlled unmanned aerial vehicle, and releasing the object from the lifting hook. The lifting hook has a main board, a first sliding plate and a second sliding plate, a first base and a second base, a pair of hooks, a generator, and a rack. The first sliding plate and the second sliding plate are configured to be hung on the radio-controlled unmanned aerial vehicle and are configured to be fixed to each other and slide up and down relative to the main board in a state of clamping the main board. The first base and the second base are configured to be fixed to each other and slide up and down relative to the main board in a state of clamping the main board. A pair of hooks are rotatably connected to the first base and the second base, respectively. The generator is fixed to the main board. The rack is connected to the generator and fixed to the first sliding plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic front view of a lifting hook involved in an embodiment of the present invention.

[0016] Figure 2 It is a schematic rear view of a lifting hook involved in an embodiment of the present invention.

[0017] Figure 3 It is a schematic perspective view of a lifting hook involved in an embodiment of the present invention.

[0018] Figure 4 It is a schematic perspective view of a lifting hook involved in an embodiment of the present invention.

[0019] Figure 5 It is a schematic front view of a lifting hook involved in an embodiment of the present invention.

[0020] Figure 6 It is a schematic front view of a lifting hook involved in an embodiment of the present invention.

[0021] Figure 7 It is a schematic front view of a lifting hook involved in an embodiment of the present invention.

[0022] Figure 8It is a schematic front view of a lifting hook involved in an embodiment of the present invention.

[0023] Fig. 9 It is a schematic rear view of a lifting hook involved in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Hereinafter, various embodiments of the invention disclosed in the present application will be described with reference to the accompanying drawings. However, the present invention can be implemented in various ways within the scope not departing from the gist thereof, and should not be interpreted as being limited to the description of the embodiments illustrated below.

[0025] In order to make the description clearer, the drawings schematically show the width, thickness, shape, etc. of each part compared to the actual state, but these are only examples and do not limit the interpretation of the present invention. In addition, in this specification and each drawing, the same reference numerals are given to elements having the same functions as those of the elements explained with reference to the drawings already shown, and there are cases where repeated descriptions are omitted.

[0026] Hereinafter, a lifting hook 100 and a method for transporting articles using the lifting hook 100 according to an embodiment of the present invention will be described. The lifting hook 100 is a hook configured to be hung on a drone and to hang articles. As described below, the lifting hook 100 will not be accidentally opened during the transportation of articles, that is, during the flight of the drone, and the lifting hook 100 can be automatically opened when the articles are lowered to the ground, thereby releasing the goods from the lifting hook 100.

[0027] 1. Structure

[0028] Figure 1 and Figure 2 1 and 2 are schematic front and rear views of a lifting hook 100 according to an embodiment of the present invention, respectively. Figure 3 and Figure 4 is a schematic perspective view of the lifting hook 100 . Figures 5 to 9 1 is a schematic front view or rear view showing the process of hanging an article on the lifting hook 100. In addition, for easy observation, Figure 6 and Figure 7 The latch 120 and the first spring 110 described below are not shown. Hereinafter, the vertical direction in the state where the lifting hook 100 is suspended by the drone or the like is referred to as the up-down direction or the z direction. In addition, the normal direction of the main surface of the main board 102 to be described below, which is perpendicular to the z direction, is referred to as the x direction, and the direction perpendicular to the z direction and the x direction is referred to as the y direction.

[0029] As can be seen from these drawings, the lifting hook 100 has the following structure as a basic structure. These structures may contain metals such as iron, aluminum, copper, or alloys such as stainless steel and brass, or may contain resins such as epoxy resin, phenolic resin, fluorine-containing resin, etc. The resin may be a fiber-reinforced plastic containing glass fiber, carbon fiber, etc.

[0030] Motherboard 102

[0031] A pair of sliding plates (a first sliding plate 104 and a second sliding plate 106)

[0032] Latch 120

[0033] A pair of bases (a first base 130, a second base 132)

[0034] First spring 110

[0035] Second spring 112

[0036] Hook 140

[0037] Rack 150

[0038] Small gear 152

[0039] Generator 160

[0040] (1) Motherboard

[0041] The main board 102 is a component that supports various structures installed on the main board 102. The main board 102 is provided with grooves 102b and 102c for the hook 140 to move up and down and rotate, a groove 102a for the latch 120 to move up and down, and a groove 102f for the first base 130 and the second base 132 to move up and down (see Figure 7 ) and the groove 102g (see Figure 7 . ) etc. In addition, although not shown, the main plate 102 is provided with an opening for inserting the shaft of the pinion gear 152.

[0042] (2) First sliding plate, second sliding plate, first spring and second spring

[0043] The first sliding plate 104 and the second sliding plate 106 are fixed to each other by one or more sliding pins 170 in a manner of sandwiching at least a portion of the main board 102 and facing each other. The main board 102 is provided with one or more grooves 102g for moving up and down with the sliding pins 170 inserted therein, so that the main board 102 can move up and down relative to the first sliding plate 104 and the second sliding plate 106. In addition, the first sliding plate 104 and the second sliding plate 106 are respectively provided with hanging holes 104a and 106a for hanging the lifting hook 100 on the drone. The grooves 102g provided on the main board 102 and for the sliding pins 170 to move are formed so that when the main board 102 moves up and down relative to the first sliding plate 104 and the second sliding plate 106, the main board 102 does not overlap with the hanging holes 104a and 106a in the y direction.

[0044] The rack 150 extending in the up-down direction is fixed to the first sliding plate 104. In addition, the first sliding plate 104 is provided with a first spring 110. Specifically, one end of the first spring 110 is connected to the first sliding plate 104, and the other end is connected to the latch 120. Since the first spring 110 is also connected to the first sliding plate 104 and the latch 120 through the sliding pins 173 and 172, respectively, the first spring 110 can rotate around the axis of the sliding pin 173, that is, the axis perpendicular to the main surface of the first sliding plate 104.

[0045] The second sliding plate 106 is provided with a second spring 112. Similar to the first spring 110, one end of the second spring 112 is connected to the second sliding plate 106 via the sliding pin 173, so that the second sliding plate 106 can be rotated relative to the second sliding plate 106 about the axis of the sliding pin 173, that is, the axis perpendicular to the main surface of the second sliding plate 106.

[0046] (3) First base, second base, and latch

[0047] The first base 130 and the second base 132 are arranged in a manner of sandwiching the main board 102, and are fixed to each other by a plurality of sliding pins 174, 176, 178. As described above, the main board 102 is provided with a groove 102b, and the groove 102b is arranged so that the sliding pin 178 for fixing the first base 130 and the second base 132 can penetrate and move up and down. Therefore, the first base 130 and the second base 132 can also move up and down relative to the main board 102.

[0048] The other end of the second spring 112 is connected to the second base 132 via a sliding pin 174. On the other hand, the other end of the first spring 110 is connected to the first base 130 via a latch 120. The latch 120 is a component that has one function of temporarily fixing the positions of the first base 130 and the second base 132 relative to the main board 102, and has an L-shaped shape. The other end of the first spring 110 is connected to the L-shaped curved portion of the latch 120 via a sliding pin 172. In addition, as described above, the groove 102a is provided in the main board 102 in such a manner that the sliding pin 172 connecting the latch 120 and the first spring 110 can penetrate and move up and down. In addition, one end of the latch 120 (the end of one of the two straight portions existing due to the curved portion) is connected to the first base 130 via a sliding pin 174. Therefore, the latch 120 can move in the up-down direction while rotating about the slide pins 172 and 174 with respect to the first spring 110 and the first base 131 , following the up-down movement of the first base 130 and the second base 132 .

[0049] In addition, if Figure 3 As shown, at the bottom of the groove 102a through which the sliding pin 172 connecting the first spring 110 and the latch 120 passes through the main board 102, an exit groove 102d (see the dotted circle) for temporarily fixing the sliding pin 172 is provided. Therefore, the groove 102a is an L-shaped groove, and the long side of the L-shaped groove is configured to be parallel to the vertical direction (i.e., the direction in which the first sliding plate 104 and the second sliding plate 106 slide relative to the main board 102), and when the first base 130 and the second base 132 have completed sliding, the short side is used as the exit groove 102d for temporarily inserting the sliding pin 172. The position and size of the exit groove 102d are set so that when the sliding pin 172 is inserted into the exit groove 102d, the restoring force of the first spring 110 and the second spring 112 works, and the sliding pin 172 does not move in this state.

[0050] Here, the first spring 110 and the second spring 112 are connected to the first sliding plate 104 and the second sliding plate 106 respectively using the same sliding pin 173. Alternatively, the ends of the first spring 110 and the second spring 112 connected to the first sliding plate 104 and the second sliding plate 106 overlap in the y direction. However, the first spring 110 extends to the hook 140 side on one side, and the second spring 112 extends to the hook 140 side on the other side. Therefore, the vector of the restoring force generated when the first spring 110 and the second spring 112 extend is in the z direction or the approximate z direction, so that the moving direction of the first base 130 and the second base 132 can be fixed in the approximate up-down direction, so that the first base 130 and the second base 132 can stably move up and down.

[0051] (4) Hook

[0052] The pair of hooks 140 have a hook shape, a portion of which is sandwiched between the first base 130 and the second base 132, and a sliding pin 178 that fixes the first base 130 and the second base 132 passes through the end of one of the hooks 140, and the other sliding pin 178 passes through the end of the other hook 140 (see Figure 1 . ). Thus, a pair of hooks 140 are connected to the first base 130 and the second base 132, respectively. In addition, each hook 140 is also provided with a sliding pin 180 for rotation that passes through the main board 102. The sliding pin 178 is arranged in a groove 102b extending in the z direction provided in the main board 102. On the other hand, the sliding pin 178 for rotation is arranged in a curved or arc-shaped groove 102c provided in the main board 102. The groove 102c is sandwiched between a pair of linear grooves 102b, and is arranged so that the closer to the hanging holes 104a, 106a, the farther the distance between each other. Therefore, when the first base 130 and the second base 132 move downward relative to the main board 102, the sliding pin 180 moves along the groove 102c. As a result, the pair of hooks 140 can be rotated relative to the first base 130 and the second base 132 respectively around the axis extending in the y direction and closed. On the contrary, when the first base 130 and the second base 132 move upward relative to the main board 102 , the hook 140 rotates in the opposite direction and opens.

[0053] (5) Rack, pinion and generator

[0054] The rack 150 is fixed to the first sliding plate 104 and extends in the vertical direction. The pinion 152 meshing with the rack 150 is arranged to penetrate the main plate 102. Figures 1 to 4As shown, the generator 160 is fixed to the main board 102 and has a generator gear 158 for driving. The generator 160 and the generator gear 158 are arranged in a manner of sandwiching the main board 102. The generator gear 158 is connected to the pinion 152 directly or through one or more intermediate gears 154 and 156. Therefore, the generator 160 is meshed with the rack 150 through the pinion 152. In this way, when the pinion 152 rotates due to the up and down movement of the rack 150, the rotation is transmitted to the generator gear 158 directly or through the intermediate gears 154 and 156, so that the generator gear 158 rotates, and electricity is generated in the generator 160. The power generation can be performed by rotating a magnet in a coil provided in the generator 160 using the generator gear 158, or by configuring a plurality of magnets in the generator 160 and rotating the coil between the magnets using the generator gear 158. In addition, in the example shown in the figure, the generator 160 and the pinion 152 are arranged on one side of the main board 102, and the generator gear 158 and the intermediate gears 154 and 156 are arranged on the other side of the main board 102, but their arrangement is not limited to the above arrangement. Therefore, the generator 160, the pinion 152, the generator gear 158, and the intermediate gears 154 and 156 can all be arranged on the same side relative to the main board 102.

[0055] As described below, if the drone suddenly rises or falls while transporting an item hung from the hook 140, the load of the item hung from the hook 140 changes temporarily, causing the main board 102 to move up and down relative to the first sliding plate 104 and the second sliding plate 106. Since the rack 150 is fixed to the first sliding plate 104 and the pinion 152 is connected to the main board 102, the up and down movement of the main board 102 relative to the first sliding plate 104 and the second sliding plate 106 causes the rack 150 to move up and down relative to the pinion 152. This movement causes the pinion 152 to rotate, and the rotation is transmitted to the generator gear 158, thereby generating electricity in the generator 160. The reaction force of the induced electromotive force during power generation causes the generator gear 158 to generate a large resistance, thereby generating resistance to the rotation of the pinion 152, resulting in resistance to the up and down movement of the rack 150, that is, the up and down movement of the main board 102. In other words, the generator 160 functions as a resistance element that resists the up-and-down movement of the rack 150, that is, the up-and-down movement of the main plate 102 relative to the first sliding plate 104 and the second sliding plate 106. The magnitude of the resistance of the resistance element, that is, the magnitude of the reaction of the induced electromotive force generated during power generation, can be appropriately adjusted through the circuit board 162. For example, the amount of current flowing through the coil in the generator 160 can be changed through the circuit board 162.

[0056] 2. The action of the lifting hook and the method of transporting items

[0057] (1) Hanging objects

[0058] In the initial state, the sliding pin 172 that passes through the curved portion of the latch 120 is not located at the exit groove 102d, but is located at the long side of the groove 102a. In this state, the latch 120 is pulled upward due to the restoring force of the first spring 110 and the second spring 112. Therefore, the first base 130, the second base 132 and the hook 140 connected thereto are also pulled upward, and the hook 140 remains in the open state (refer to Figures 1 to 4 ).

[0059] When hanging an item, the first base 130 and the second base 132 are moved downward relative to the main board 102 so that the sliding pin 172 that passes through the curved portion of the latch 120 engages with the exit groove 102d ( Figure 5 , Figure 6 ). At this time, the slide pin 180 (see Figure 1 , Figure 2 . ) moves downward along the slot 102c, so that the hook 140 rotates and closes ( Figure 5 , Figure 6 ). In addition, since the sliding pin 174 is located at the bottom of the groove 102f, the downward (hook 140 side) movement of the first base 130 and the second base 132 relative to the main board 102 is restricted. The state at this time is hereinafter referred to as the standby state. In the standby state, since the sliding pin 172 is engaged with the exit groove 102d, the latch 120 is locked and the hook 140 remains in a closed state. In this standby state, by hanging the object on the hook 140, the object can be hung on the lifting hook 100. Normally, the object is placed on the ground or floor, etc. at this stage, so the entire load of the object is not applied to the hook 140.

[0060] (2) Drone takes off

[0061] Afterwards, when the drone takes off and the item leaves the ground or floor, the hook 140 will bear the entire load of the item. In this way, the main board 102 and the latch 120 together with the first base 130 and the second base 132 connected to the hook 140 move downward relative to the first sliding plate 104 and the second sliding plate 106. When the sliding pin 170 reaches the top of 102g, the downward movement of the main board 102 is restricted. This state is called the transport state.

[0062] Here, the first sliding plate 104 is configured to temporarily unlock the latch 120 when switching from the standby state to the transport state, and to lock the latch 120 again in the transport state. Figures 5 to 8As shown, a protrusion 102e may be provided on the side of the first sliding plate 104. When the latch 120 in the standby state moves downward relative to the first sliding plate 104, the protrusion 102e causes the latch 120 to rotate around the sliding pin 174 and causes the sliding pin 172 to slide along the x direction (i.e., along the short side) to move from the exit groove 102d to the long side of the groove 102a, and when the latch 120 moves further downward, the latch 120 rotates in the opposite direction and causes the sliding pin 172 to engage with the exit groove 102d again. The protrusion 102e is configured to allow the sliding pin 172 to engage with the exit groove 102d in the standby state, and the bent portion of the latch 120 is located above the protrusion 102e, and at the same time, when the main board 102 moves downward relative to the first sliding plate 104 and the second sliding plate 106, the sliding pin 172 is again engaged with the exit groove 102d, and the bent portion is located above the protrusion 102e. By providing the protrusion 102e, when the main board 102 moves up and down relative to the first sliding plate 104 and the second sliding plate 106, the latch 120 abuts against the protrusion 102e, so that the sliding pin 172 can be reversibly moved between the exit groove 102d and the long side portion. Therefore, the latch 120 can be locked not only in the standby state, but also in the transport state, resulting in that the hook 140 can always be in a closed state.

[0063] (3) Transportation and release of items

[0064] After switching to the transport state, the drone moves the item to the air above the specified location. Then, the item is slowly lowered to the ground or floor. When the item touches the ground or floor, the load of the item hung on the hook 140 gradually decreases. Therefore, under the restoring force of the first spring 110 and the second spring 112, the main board 102 moves upward relative to the first sliding plate 104 and the second sliding plate 106. When the load caused by the item disappears, the protrusion 102e abuts against the latch 120, and the sliding pin 172 moves from the exit slot 102d to the long side of the slot 102a (refer to Figure 8 . ). That is, the latch 120 is unlocked. In this way, the restoring force of the first spring 110 and the second spring 112 causes the sliding pin 172 to move upward along the groove 102a and return to the initial state, resulting in the opening of the hook 140. No manual labor is required when removing items from the lifting hook 100, which can save human resources and improve the work efficiency related to transportation. Therefore, the protrusion 102e has the function of locking the latch 120 in the transportation state, and has the function of automatically unlocking and opening the hook 140 when the drone lands.

[0065] Here, if the drone suddenly drops due to unexpected reasons such as airflow, improper operation, etc., the load of the item will disappear instantly or decrease rapidly. At this time, if the lifting hook 100 has a tendency to return to the initial state after the standby state, the hook 140 will accidentally open and the item will fall. However, in the lifting hook 100, the upward movement of the main board 102 generated when the load of the item disappears instantly or decreases rapidly is greatly restricted by the generator 160 that acts as a resistance to the relative up and down movement of the main board 102. In other words, the movement in the up and down direction is delayed by the generator 160. Further, when transporting items, the latch 120 is locked, and the movement of the latch 120 along the up and down direction of the slot 102a is prohibited. Therefore, even if the load disappears instantly or decreases suddenly, the upward movement of the main board 102 relative to the first sliding plate 104 and the second sliding plate 106 will be delayed, and the accidental opening of the hook 140 caused by the unlocking of the latch 120 can be prevented, so that the item can be prevented from falling.

[0066] Thus, by using the lifting hook 100 according to an embodiment of the present invention, it is possible to prevent items from falling due to airflow, improper operation of the drone, etc. when transporting items using a drone. Furthermore, the tedious work of removing items from the drone can be omitted. This not only saves human resources, but also helps to transport items safely and efficiently.

[0067] As the embodiments of the present invention, the embodiments described above can be appropriately combined and implemented as long as they are not contradictory. In addition, appropriate addition, deletion, or design changes of the constituent elements performed by those skilled in the art according to the various embodiments are included in the scope of the present invention as long as they have the gist of the present invention.

[0068] In addition, even if there are other effects different from the effects obtained by the above-mentioned embodiments, the effects that can be clearly obtained from the description of this specification or the effects that can be easily predicted by those skilled in the art are also understood to be the effects that can be obtained by the present invention.

[0069] (Explanation of Reference Numerals)

[0070] 100: lifting hook; 102: main board; 102a: slot; 102b: slot; 102c: slot;

[0071] 102d: exit groove; 102e: protrusion; 102f: groove; 102g: groove; 104: first sliding plate;

[0072] 104a: hanging hole; 106: second sliding plate; 106a: hanging hole; 110: first spring;

[0073] 112: second spring; 120: latch; 130: first base; 132: second base; 140: hook;

[0074] 150: rack; 152: pinion; 154: intermediate gear; 156: intermediate gear; 158: generator gear;

[0075] 160: generator; 162: circuit board; 170: sliding pin; 172: sliding pin; 173: sliding pin;

[0076] 174: sliding pin; 176: sliding pin; 178: sliding pin; 180: sliding pin.

Claims

1. A lifting hook, in, It includes: Motherboard; A first sliding plate and a second sliding plate are configured to be suspended from the radio-controlled unmanned aerial vehicle and to be fixed to each other so as to slide up and down relative to the main board in a state of sandwiching the main board; The first base and the second base are configured to be fixed to each other and slide up and down relative to the main board in a state of sandwiching the main board; a pair of hooks, which are rotatably connected to the first base and the second base respectively; a generator fixed to the main board; and A rack is connected to the generator and fixed to the first sliding plate.

2. The lifting hook according to claim 1, in, Also includes: A first spring and a second spring, The first end of the first spring is fixed to the first sliding plate in such a manner that the first spring can rotate relative to the first sliding plate. The second end of the first spring is connected to the first base, The first end of the second spring is fixed to the second sliding plate in such a manner that the second spring can rotate relative to the second sliding plate. The second end of the second spring is fixed to the second base in such a manner that the second spring can rotate relative to the second base.

3. The lifting hook according to claim 2, in, Also includes: A latch is connected to the first spring and the first base in a rotatable manner relative to the first spring and the first base, and is configured to slide up and down relative to the main board.

4. The lifting hook according to claim 3, in, The second end of the first spring is connected to the latch through a first sliding pin, The main plate has an L-shaped groove that allows the first slide pin to move in a penetrating state. The long side of the L-shaped groove is arranged parallel to the direction in which the first sliding plate and the second sliding plate slide relative to the main plate. The short side of the L-shaped groove is configured to be temporarily inserted into the first slide pin when the first base and the second base are completely slid.

5. The lifting hook according to claim 4, in, The first sliding plate has a protrusion on a side surface thereof, and when the main plate moves up and down relative to the first sliding plate and the second sliding plate, the protrusion allows the first sliding pin to reversibly move along the short side portion.

6. The lifting hook according to claim 1, in, The generator is meshed with the rack through a pinion gear.

7. The lifting hook according to claim 1, in, The main board has a pair of arc-shaped grooves. The second sliding pin and the third sliding pin respectively penetrating the pair of hooks move along the pair of curved grooves.

8. The lifting hook according to claim 1, in, Also includes: A circuit board is fixed to the first base and controls the characteristics of the generator.

9. A method of transporting items, in, include: Steps for hanging items on lifting hooks; The step of moving the lifting hook using a radio-controlled unmanned aerial vehicle; as well as The step of releasing the object from the lifting hook, The lifting hook has: Motherboard; A first sliding plate and a second sliding plate are configured to be suspended from the radio-controlled unmanned aerial vehicle and to be fixed to each other so as to slide up and down relative to the main board in a state of sandwiching the main board; The first base and the second base are configured to be fixed to each other and slide up and down relative to the main board in a state of sandwiching the main board; a pair of hooks, which are rotatably connected to the first base and the second base respectively; A generator, which is fixed to the main board; as well as A rack is connected to the generator and fixed to the first sliding plate.

10. The method according to claim 9, in, The lifting hook also has a first spring and a second spring, The first end of the first spring is fixed to the first sliding plate in such a manner that the first spring can rotate relative to the first sliding plate. The second end of the first spring is connected to the first base, The first end of the second spring is fixed to the second sliding plate in such a manner that the second spring can rotate relative to the second sliding plate. The second end of the second spring is fixed to the second base in such a manner that the second spring can rotate relative to the second base.

11. The method according to claim 10, in, The lifting hook further includes a latch which is connected to the first spring and the first base in a rotatable manner relative to the first spring and the first base and is configured to slide up and down relative to the main board.

12. The method according to claim 11, in, The second end of the first spring is connected to the latch through a first sliding pin, The main plate has an L-shaped groove that allows the first slide pin to move in a penetrating state. The long side of the L-shaped groove is arranged parallel to the direction in which the first sliding plate and the second sliding plate slide relative to the main plate. The short side of the L-shaped groove is configured to be temporarily inserted into the first slide pin when the first base and the second base are completely slid.

13. The method according to claim 12, in, The first sliding plate has a protrusion on a side surface thereof, and when the main plate moves up and down relative to the first sliding plate and the second sliding plate, the protrusion allows the first sliding pin to reversibly move along the short side portion.

14. The method according to claim 9, in, The generator is meshed with the rack through a pinion gear.

15. The method according to claim 9, in, The main board has a pair of arc-shaped grooves. The second sliding pin and the third sliding pin respectively penetrating the pair of hooks move along the pair of arc-shaped grooves respectively.

16. The method according to claim 9, in, The lifting hook also has a circuit board fixed to the first base and controlling the characteristics of the generator.

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