Lifting hook and method for transporting an article using a lifting hook

Abstract

The lifting hook has a main plate, a first sliding plate and a second sliding plate, a first base and a second base, a pair of hooks, a flywheel, and a rack. The first sliding plate and the second sliding plate are fixed to each other, are hung on a radio remote control unmanned aerial vehicle, and are configured to slide up and down relative to the main plate in a state of clamping the main plate. The first base and the second base are fixed to each other, and slide up and down relative to the main plate in a state of clamping the main plate. The pair of hooks are rotatably connected to the first base and the second base respectively. The flywheel is rotatably fixed to the main plate. The rack is engaged with the flywheel and is fixed to the first sliding plate.

Description

Technical Field

[0001] One embodiment of the present invention relates to a sling for transporting articles suspended from a radio-controlled unmanned aerial vehicle (hereinafter also referred to as a drone), and a method for transporting articles using the sling. Background Technology

[0002] In recent years, drones have been widely used in various fields. They can not only perform aerial photography, but also serve as tools for transporting goods, materials, and other items. For example, patent documents 1 to 5 disclose a hoist hook (hereinafter referred to as a hoist hook) that uses drones to transport items.

[0003] (Existing technical literature)

[0004] (Patent Documents)

[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] (The problem the invention aims to solve)

[0011] One objective of one embodiment of the present invention is to provide a lifting hook with a novel structure and a method for transporting items using such a lifting hook. Alternatively, one objective of one embodiment of the present invention is to provide a lifting hook that can prevent items from falling even in the event of an unexpected and sudden descent of a drone, and a method for transporting items using such a lifting hook.

[0012] (The 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 flywheel, and a rack. The first and second sliding plates are fixed to each other, suspended from a radio-controlled unmanned aerial vehicle, and configured to slide up and down relative to the main board while clamping it. The first and second bases are also fixed to each other and slide up and down relative to the main board while clamping it. A pair of hooks are rotatably connected to the first and second bases, respectively. The flywheel is rotatably fixed to the main board. The rack engages with the flywheel and is fixed to the first sliding plate.

[0014] One embodiment of the present invention is a method for transporting articles. The method includes the steps of suspending the articles on a lifting hook, moving the lifting hook using a radio-controlled unmanned aerial vehicle (UAV), and releasing the articles 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 flywheel, and a rack. The first and second sliding plates are fixed to each other, suspended from the radio-controlled UAV, and configured to slide up and down relative to the main board while clamping it. The first and second bases are fixed to each other and slide up and down relative to the main board while clamping it. A pair of hooks are rotatably connected to the first and second bases, respectively. The flywheel is rotatably fixed to the main board. The rack engages with the flywheel and is fixed to the first sliding plate. Attached Figure Description

[0015] Figure 1 This is a schematic front view of the lifting hook according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic rear view of the lifting hook according to an embodiment of the present invention.

[0017] Figure 3 This is a schematic perspective view of the lifting hook according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic perspective view of the lifting hook according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic perspective view of a portion of the lifting hook according to an embodiment of the present invention.

[0020] Figure 6 This is a schematic front view of the lifting hook according to an embodiment of the present invention.

[0021] Figure 7 This is a schematic front view of the lifting hook according to an embodiment of the present invention.

[0022] Figure 8This is a schematic front view of the lifting hook according to an embodiment of the present invention.

[0023] Figure 9 This is a schematic front view of the lifting hook according to an embodiment of the present invention.

[0024] Figure 10 This is a schematic rear view of the lifting hook according to an embodiment of the present invention. Detailed Implementation

[0025] Various embodiments of the invention disclosed in this application will now be described with reference to the accompanying drawings. However, the invention can be implemented in various ways without departing from its essential points and should not be construed as limited to the description of the embodiments illustrated below.

[0026] To make the description clearer, the width, thickness, shape, etc. of each part are schematically shown in the drawings 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 the drawings, elements that have the same function as those described with reference to the drawings already shown are given the same reference numerals, and there are instances where repeated descriptions are omitted.

[0027] The following describes a lifting hook 100 according to one embodiment of the present invention and a method for transporting goods using the lifting hook 100. The lifting hook 100 is a hook configured to be suspended from a drone and to suspend goods. As described below, the lifting hook 100 will not be accidentally opened during the transport of goods, i.e., during the flight of the drone, and can automatically open the hook to release the goods from the lifting hook 100 when the goods are lowered to the ground.

[0028] 1. Structure

[0029] Figure 1 and Figure 2 These are schematic front and rear views of the lifting hook 100 according to one embodiment of the present invention. Figure 3 and Figure 4 This is a schematic 3D diagram of lifting hook 100. Figure 5 It is a schematic perspective view of the flywheel 160 installed on the lifting hook 100 and its surrounding components. Figures 6 to 10 This is a schematic front or rear view illustrating the process of suspending an item on the lifting hook 100. Additionally, for ease of observation, Figures 7 to 9The latch 120, first spring 110, etc., described below are not shown. Hereinafter, the vertical direction of the lifting hook 100 when it is suspended by a drone or the like will be referred to as the up-down direction or the z-direction. In addition, the normal direction of the main surface of the motherboard 102, which is perpendicular to the z-direction and will be described later, will be referred to as the x-direction, and the direction perpendicular to both the z-direction and the x-direction will be referred to as the y-direction.

[0030] As can be seen from these figures, the lifting hook 100 has the following basic structure. These structures may contain metals such as iron, aluminum, and copper, or alloys such as stainless steel and brass, or resins such as epoxy resin, phenolic resin, and fluorinated resin. The resin may be fiber-reinforced plastic containing glass fiber, carbon fiber, etc.

[0031] Motherboard 102

[0032] A pair of sliding plates (first sliding plate 104, second sliding plate 106)

[0033] Latch 120

[0034] A pair of bases (base 130, base 132)

[0035] First spring 110

[0036] Second spring 112

[0037] Hook 140

[0038] rack 150

[0039] Small Gear 152

[0040] Flywheel 160

[0041] (1) Motherboard

[0042] The motherboard 102 is a component that supports various structures mounted on the motherboard 102. The motherboard 102 is provided with slots 102b and 102c for the hook 140 to rotate while moving up and down, slot 102a for the latch 120 to move up and down, and slot 102f for the first base 130 and the second base 132 to move up and down (see reference). Figure 7 ), and the groove 102g for the first sliding plate 104 and the second sliding plate 106 to move up and down (refer to Figure 8 and Figure 9 。 ) etc. In addition, although not illustrated, the motherboard 102 is provided with an opening for inserting the shaft of the pinion 152.

[0043] (2) First sliding plate, second sliding plate, first spring and second spring

[0044] The first sliding plate 104 and the second sliding plate 106 are fixed to each other by one or more sliding pins 170 in such a way that they clamp at least a portion of the main board 102 and are positioned opposite each other. The main board 102 is provided with one or more slots 102g for vertical movement when the sliding pins 170 are inserted, thus the main board 102 can move vertically 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 suspension holes 104a and 106a for suspending the lifting hook 100 to the drone. The slots 102g provided on the main board 102 for the movement of the sliding pins 170 are formed such that when the main board 102 moves vertically relative to the first sliding plate 104 and the second sliding plate 106, the main board 102 does not overlap with the suspension holes 104a and 106a in the y direction.

[0045] A rack 150 extending vertically is fixed to a first sliding plate 104. Additionally, a first spring 110 is provided on the first sliding plate 104. Specifically, one end of the first spring 110 is connected to the first sliding plate 104, and the other end is connected to a latch 120. Since the first spring 110 is also connected to the first sliding plate 104 and the latch 120 respectively via sliding pins 173 and 172, the first spring 110 can rotate about the axis of the sliding pin 173, that is, the axis perpendicular to the main surface of the first sliding plate 104.

[0046] 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 a sliding pin 173, so that it can rotate 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.

[0047] (3) First base, second base and latch

[0048] The first base 130 and the second base 132 are configured to clamp the motherboard 102 and are fixed to each other by a plurality of sliding pins 174, 176, and 178. As described above, the motherboard 102 is provided with a slot 102b, which is configured to allow the sliding pins 178 for fixing the first base 130 and the second base 132 to pass through and move up and down. Therefore, the first base 130 and the second base 132 can also move up and down relative to the motherboard 102.

[0049] 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, having an L-shaped shape, is a component that temporarily fixes the positions of the first base 130 and the second base 132 relative to the main board 102. The other end of the first spring 110 is connected to the L-shaped bend of the latch 120 via the sliding pin 172. Furthermore, as described above, the slot 102a is provided on the main board 102 such that the sliding pin 172 connecting the latch 120 and the first spring 110 can pass through and move up and down. Additionally, one end of the latch 120 (the end of one of the two straight portions present due to the bend) is connected to the first base 130 via the sliding pin 174. Therefore, the latch 120 can follow the up and down movement of the first base 130 and the second base 132, and while rotating relative to the first spring 110 and the first base 130 with the sliding pins 172 and 174 as the center, it moves in the up and down direction.

[0050] In addition, such as 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, a release groove 102d (refer to the circle in the dashed line) is provided for temporarily fixing the sliding pin 172. Therefore, the groove 102a is L-shaped, configured such that the long side of the L-shaped groove is 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). When the first base 130 and the second base 132 have slid completely, the short side serves as the release groove 102d for temporarily engaging the sliding pin 172. The position and size of the release groove 102d are set such that when the sliding pin 172 is engaged in the release groove 102d, the restoring force of the first spring 110 and the second spring 112 is activated, and the sliding pin 172 does not move in this state.

[0051] 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 respectively overlap in the y-direction. However, the first spring 110 extends towards one of the hooks 140, and the second spring 112 extends towards the other hook 140. 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 approximately in the z-direction. Thus, the direction of movement of the first base 130 and the second base 132 can be fixed in an approximately vertical direction, allowing the first base 130 and the second base 132 to move stably up and down.

[0052] (4) Hook

[0053] A pair of hooks 140 have a hook-shaped configuration, with a portion of each hook sandwiched between a first base 130 and a second base 132. A sliding pin 178, securing the first base 130 and the second base 132, passes through the end of one hook 140, while other sliding pins 178 pass through the end of the other hook 140 (see reference). Figure 1 Thus, a pair of hooks 140 are respectively connected to the first base 130 and the second base 132. Furthermore, each hook 140 is provided with a rotating sliding pin 180 that passes through the main board 102. The sliding pin 178 is disposed in a groove 102b extending in the z-direction of the main board 102. On the other hand, the rotating sliding pin 180 is disposed in a curved or arc-shaped groove 102c of the main board 102. The groove 102c is sandwiched between a pair of straight grooves 102b, and is arranged such that the closer to the suspension holes 104a and 106a, the greater the distance between them. 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 closed by rotating relative to the first base 130 and the second base 132 about an axis extending in the y-direction. Conversely, 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.

[0054] (5) Rack, pinion and flywheel

[0055] The rack 150 is fixed to the first sliding plate 104 and extends vertically. The pinion 152, which meshes with the rack 150, is arranged to pass through the main plate 102. Figure 5As shown, the flywheel 160 is rotatably fixed to the side of the second sliding plate 106 of the mainboard 102. The flywheel 160 meshes with the pinion 152 directly or through one or more intermediate gears 154, 156. Details will be explained below. If the drone suddenly rises or falls while transporting an item suspended from the hook 140, the load on the item hanging on the hook 140 will temporarily change, causing the mainboard 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 mainboard 102, the up and down movement of the mainboard 102 relative to the first sliding plate 104 and the second sliding plate 106 will cause the rack 150 to move up and down relative to the pinion 152. This movement causes the pinion 152 to rotate, thereby driving the flywheel 160. The flywheel 160 is a rotating body with a large moment of inertia. Although a large force is required to start its rotation, once it begins to rotate, its moment of inertia is used to maintain the rotational motion. Therefore, in a stationary state, a large force is required to move the rack 150 up and down. In other words, the flywheel 160 is used as a resistance element, resisting 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 can be adjusted by appropriately adjusting the structure of the flywheel 160. Furthermore, the arrangement of the rack 150, pinion 152, flywheel 160, etc., is not limited to the arrangement shown in the figure; some or all of them can be arranged on the side of the first sliding plate 104.

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

[0057] (1) Hanging items

[0058] In the initial state, the sliding pin 172, which passes through the curved portion of the latch 120, is not located in the exit groove 102d, but rather in the long side of the groove 102a. In this state, the latch 120 is pulled upward by 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 to them are also pulled upward, and the hook 140 remains in the open state (see reference). Figures 1 to 4 ).

[0059] When suspending 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 passing through the bend of the latch 120 engages with the exit groove 102d. Figure 6 , Figure 7 At this time, the sliding pin 180 of the through groove 102c (refer to...) Figure 1 , Figure 2 As the hook moves downward along the groove 102c, it rotates and closes. Figure 6 , Figure 7 Furthermore, since the sliding pin 174 is located at the bottom of the slot 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. This state is referred to below as the standby state. In the standby state, since the sliding pin 172 engages with the exit slot 102d, the latch 120 is locked, and the hook 140 remains closed. In this standby state, by hanging an item on the hook 140, an item can be suspended from the lifting hook 100. Normally, the item is placed on the ground or floor at this stage, so the full load of the item is not applied to the hook 140.

[0060] (2) Drone takeoff

[0061] Subsequently, when the drone takes off, lifting the item off the ground or floor, the hook 140 will bear the full load of the item. Thus, the motherboard 102 and latch 120, along with the first base 130 and second base 132 connected to the hook 140, move downwards relative to the first sliding plate 104 and the second sliding plate 106. When the sliding pin 170 reaches the top of the slot 102g, the downward movement of the motherboard 102 is restricted. This state is referred to as the transport state.

[0062] Here, the first sliding plate 104 is configured to temporarily unlock the latch 120 when switching from a standby state to a transport state, and to lock the latch 120 again when in the transport state. Specifically, as Figures 6 to 9 As shown, the side of the first sliding plate 104 may be provided with a protrusion 102e. 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. 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 curved portion of the latch 120 is located above the protrusion 102e. Simultaneously, when the main board 102 moves downward relative to the first sliding plate 104 and the second sliding plate 106, the sliding pin 172 engages with the exit groove 102d again, and the curved portion is located below 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, allowing the sliding pin 172 to move reversibly between the exit groove 102d and the long side. Therefore, the latch 120 can be locked not only in the standby state but also in the transport state, resulting in the hook 140 always being in the closed state.

[0063] (3) Transport and release of goods

[0064] After switching to transport mode, the item is moved by a drone to transport it to the designated location. Then, the item is slowly lowered to the ground or floor. As the item touches the ground or floor, the load on the item hanging on 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 groove 102d to the long side of the groove 102a (see reference). Figure 8 That is, latch 120 is unlocked. Thus, 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 its initial state, resulting in the opening of the hook 140. Therefore, removing items from the lifting hook 100 requires no manual intervention, saving manpower and improving efficiency in transportation-related work. Therefore, the protrusion 102e has the function of locking latch 120 in the transportation state while also automatically unlocking and opening the hook 140 when the drone lands.

[0065] Here, if the drone suddenly descends during flight due to unexpected reasons such as airflow or improper operation, the load on the item will instantly disappear or rapidly decrease. At this time, if the lifting hook 100 tends to return to its initial state after a 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 caused by the instantaneous disappearance or rapid decrease of the load is greatly restricted by the flywheel 160, which acts as a resistance to the relative up-and-down movement of the main board 102. In other words, the up-and-down movement is delayed by the flywheel 160. Furthermore, during item transport, the latch 120 is locked, and the up-and-down movement of the latch 120 along the groove 102a is prohibited. Therefore, even in the case of instantaneous disappearance or sudden decrease of the load, the upward movement of the main board 102 relative to the first sliding plate 104 and the second sliding plate 106 is delayed, preventing the hook 140 from accidentally opening due to the unlocking of the latch 120, thus preventing the item from falling.

[0066] Thus, by using the lifting hook 100 according to one embodiment of the present invention, it is possible to prevent items from falling due to airflow or improper drone operation when transporting goods using a drone. Furthermore, it eliminates the tedious work of unloading items from the drone. This not only saves manpower but also contributes to the safe and efficient transportation of goods.

[0067] The embodiments described above, as embodiments of the present invention, can be appropriately combined and implemented as long as they do not contradict each other. Furthermore, appropriate additions, deletions, or design changes of constituent elements made by those skilled in the art based on the various embodiments, as long as they capture the essence of the present invention, are included within the scope of the present invention.

[0068] Furthermore, even if other effects differ from those obtained by the various embodiments described above, effects that are clearly obtained from the description in this specification or that can be easily predicted by those skilled in the art are also understood to be effects that can be obtained by the present invention.

[0069] (Explanation of reference numerals in the attached diagram)

[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: Suspension hole; 106: Second sliding plate; 106a: Suspension 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;

[0075] 160: Flywheel; 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, wherein, It includes: Motherboard; The first sliding plate and the second sliding plate are configured to be suspended on the radio-controlled unmanned aerial vehicle and to be fixed to each other so as to slide up and down relative to the motherboard in a state of clamping the motherboard. The first base and the second base are fixed to each other so that they can slide up and down relative to the motherboard while clamping it. A pair of hooks, which are rotatably connected to the first base and the second base respectively; The flywheel is rotatably fixed to the main board; A rack, which meshes with the flywheel and is fixed to the first sliding plate; First spring and second spring; and The latch is configured to rotate relative to the first base and the second base. The first end of the first spring is fixed to the first sliding plate in such a way 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 way 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 way that the second spring can rotate relative to the second base. The latch is configured to be in a locked state and an unlocked state. The latch, in the locked state, keeps the pair of hooks closed, and in the unlocked state, opens the pair of hooks. The first sliding plate has a protrusion that projects relative to the latch. The latch is configured to abut against the protrusion when the first sliding plate and the second sliding plate slide.

2. The lifting hook according to claim 1, wherein, The pair of hooks are configured to partially overlap in a direction parallel to the axis of rotation of the pair of hooks when in the closed state.

3. The lifting hook according to claim 1, wherein, The flywheel is configured to be driven by gears that rotate due to the relative sliding between the main board and the first and second sliding plates.

4. The lifting hook according to claim 1, wherein, The flywheel provides resistance to the relative sliding between the main board and the first and second sliding plates.

5. A method for transporting goods, wherein, include: The steps for suspending the item on the lifting hook; The step of using a radio-controlled unmanned aerial vehicle to move the lifting hook; as well as The step of releasing the item from the lifting hook. The lifting hook has: Motherboard; The first sliding plate and the second sliding plate are configured to be suspended on the radio-controlled unmanned aerial vehicle and to be fixed to each other so as to slide up and down relative to the motherboard in a state of clamping the motherboard. The first base and the second base are fixed to each other so that they can slide up and down relative to the motherboard while clamping it. A pair of hooks, which are rotatably connected to the first base and the second base respectively; The flywheel is rotatably fixed to the main board; A rack, which meshes with the flywheel and is fixed to the first sliding plate; First spring and second spring; as well as The latch is configured to rotate relative to the first base and the second base. The first end of the first spring is fixed to the first sliding plate in such a way 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 way 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 way that the second spring can rotate relative to the second base. The latch is configured to be in a locked state and an unlocked state. The latch, in the locked state, keeps the pair of hooks closed, and in the unlocked state, opens the pair of hooks. The first sliding plate has a protrusion that projects relative to the latch. The latch is configured to abut against the protrusion when the first sliding plate and the second sliding plate slide.

6. The method according to claim 5, wherein, The pair of hooks are configured to partially overlap in a direction parallel to the axis of rotation of the pair of hooks when in the closed state.

7. The method according to claim 5, wherein, The flywheel is configured to be driven by gears that rotate due to the relative sliding between the main board and the first and second sliding plates.

8. The method according to claim 5, wherein, The flywheel provides resistance to the relative sliding between the main board and the first and second sliding plates.

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