Ratchet wheel type lifting device

Abstract

The ratchet wheel type lifting device comprises a fixing frame, a rotating shaft, a handle, a transmission disc, a gear shifting assembly, a reversing assembly, a power gear and a rack, and the rotating shaft is rotatably arranged on the fixing frame; the handle is fixedly connected with the rotating shaft; the transmission disc is rotatably arranged on the rotating shaft in a sleeving manner, and a transmission shaft is rotatably arranged on the transmission disc in a penetrating manner; the gear shifting assembly is located on one side of the transmission disc and comprises a transmission wheel, an operation block, a reset piece and two clamping jaws, the transmission wheel is fixedly arranged on the rotating shaft, the clamping jaws are rotatably arranged on the transmission disc and used for locking the transmission wheel, and the reset piece is connected with the clamping jaws to drive the clamping jaws to rotate in the direction close to the transmission wheel. The operation block is fixedly arranged at one end of the transmission shaft and located between the two clamping jaws. The operation block is used for driving the two clamping jaws to be away from each other so as to unlock the transmission wheel. The reversing assembly is located on the other side of the transmission disc. According to the ratchet wheel type lifting device, a user can conveniently and safely lift heavy-load parts in fitness equipment in a labor-saving manner.

Description

A ratchet-type lifting device Technical Field

[0001] This invention relates to the field of intelligent fitness equipment technology, and in particular to a ratchet-type lifting device. Background Technology

[0002] In some fitness equipment, the height of certain components often needs to be adjusted to suit the user's body type and training posture to ensure comfort and effectiveness. For example, some smart exercise bikes have large displays on the handlebars for showing exercise data, playing instructional videos, or providing interactive functions. These displays are mounted on the handlebars and rise and fall synchronously with them. Because the combined weight of the display and handlebars is significant, users must overcome this weight load when adjusting the handlebar height, making the process laborious and potentially unsafe. Therefore, achieving effortless and safe height adjustment of heavy-load components in fitness equipment has become a key technological requirement for improving ease of use. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a ratchet-type lifting device that allows users to lift heavy-load components in fitness equipment in a labor-saving, convenient and safe manner.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a ratchet-type lifting device, comprising a fixed frame, a rotating shaft, a handle, a transmission disc, a shifting assembly, a reversing assembly, a power gear, and a rack. The rotating shaft is rotatably mounted on the fixed frame; the handle is fixedly connected to the rotating shaft; the transmission disc is rotatably sleeved on the rotating shaft, and the transmission shaft is rotatably threaded through the transmission disc; the shifting assembly is located on one side of the transmission disc, and includes a transmission wheel, an operating block, a reset member, and two grippers. The transmission wheel is fixed on the rotating shaft, the grippers are rotatably mounted on the transmission disc and used to lock the transmission wheel, the reset member connects to the grippers to drive the grippers to rotate towards the transmission wheel, the operating block is fixed at one end of the transmission shaft and located between the two grippers, and the operating block is used to drive the two grippers away from each other to unlock the transmission wheel; the reversing assembly is located on the other side of the transmission disc, and the reversing assembly... The device includes a reversing ratchet, a reversing block, a first elastic element, a second elastic element, a first pawl, and a second pawl. The reversing ratchet is rotatably mounted on a rotating shaft. The first and second pawls are rotatably mounted on a transmission disk. The first pawl engages with the reversing ratchet to limit its unidirectional rotation in a counterclockwise direction, and the second pawl engages with the reversing ratchet to limit its unidirectional rotation in a clockwise direction. The first elastic element connects the first pawl to the transmission disk to drive the first pawl to rotate towards the reversing ratchet. The second elastic element connects the second pawl to the transmission disk to drive the second pawl to rotate towards the reversing ratchet. The reversing block is fixed to the other end of the transmission shaft and located between the first and second pawls. The reversing block is used to separate the first or second pawl from the reversing ratchet. The drive gear is fixedly connected to the reversing ratchet. The rack meshes with the drive gear.

[0005] The beneficial effects of this invention are as follows: This ratchet-type lifting device has a novel structure, and through the cooperation of the shifting component and the reversing component, it achieves labor-saving and safe lifting and adjusting of heavy-load components. In neutral, the two grippers remain in contact with the operating block. The operating block moves the two grippers away from each other to unlock the transmission wheel, thus disconnecting the transmission disc from the shaft. At this time, the reversing block rotates with the transmission shaft to a position where no pushing force is applied to the first and second pawls. The first and second pawls engage with the reversing ratchet under the action of their respective first and second elastic elements, and the reversing ratchet is locked in both directions and cannot rotate. When an external force is applied to the operating block to make it rotate a certain angle, the support distance between the two grippers becomes shorter. The two grippers move closer to each other under the action of the reset element to lock the transmission wheel. The transmission disc and the shaft form a transmission connection. At the same time, the reversing block rotates with the transmission shaft to a position where the first or second pawl separates from the reversing ratchet. This selectively limits the reversing ratchet to rotate in one direction, either counterclockwise or clockwise, thereby achieving the upward or downward movement of the rack through the meshing transmission of the power gear and the rack. Based on this, users only need to pull the handle to utilize the unidirectional transmission characteristics of the ratchet mechanism to convert intermittent manual pulling force into lifting driving force, effectively dispersing the operating force required to overcome heavy loads and achieving labor-saving adjustment. Attached Figure Description

[0006] Figure 1 is a structural schematic diagram of the fitness equipment; Figure 2 is a structural schematic diagram of the overall structure of the ratchet-type lifting device; Figure 3 is a sectional view of a portion of the ratchet-type lifting device; Figure 4 is an exploded view of a portion of the ratchet-type lifting device (first); Figure 5 is an exploded view of a portion of the ratchet-type lifting device (second); Figure 6 is a structural schematic diagram of a portion of the ratchet-type lifting device (first); Figure 7 is a structural schematic diagram of a portion of the ratchet-type lifting device (second); Figure 8 is an exploded view of a portion of the ratchet-type lifting device (third); Figure 9 is an exploded view of a portion of the ratchet-type lifting device (fourth); Figure 10 is an exploded view of a portion of the ratchet-type lifting device (fifth); Figure 11 is an exploded view of a portion of the ratchet-type lifting device (sixth); Figure 12 is a sectional view of the ratchet-type lifting device; Figure 13 is a structural schematic diagram of the locking mechanism in the ratchet-type lifting device; Figure 14 is a schematic diagram of the engagement between the neutral locking component and the power gear in the ratchet-type lifting device.

[0007] Labeling Explanation: 1. Fixing Frame; 11. Protective Cover; 12. Guide Post; 13. Ball-Head Plunger; 2. Rotating Shaft; 3. Handle; 31. Rocker Arm; 32. Reinforcing Rod; 33. Positioning Port; 4. Transmission Disc; 41. Transmission Shaft; 42. Gear Position Indicator Disc; 421. Gear Position Indicator; 5. Gear Shifting Assembly; 51. Transmission Wheel; 52. Operating Block; 521. First Contact Surface; 522. Second Contact Surface; 523. Third Contact Surface; 524. Protruding Post; 53. Reset Part; 54. Gripper; 55. Gear Shifting Disc; 551. Limiting Slide Groove; 552. Gear Position Indicator; 6. Reversing Assembly; 61. Reversing Ratchet; 62. 63. Reversing block; 64. First elastic element; 65. Second elastic element; 66. First pawl; 67. Second pawl; 78. Power gear; 79. Receiving cavity; 80. Rack; 81. Lifting rod; 91. Locking mechanism; 92. Locking assembly; 93. Movable clamping block; 94. Second guide ramp; 95. Abutting surface; 96. Sliding clamping block; 97. Contact pad; 98. Sliding block; 99. First guide ramp; 99. Abutting part; 90. Guide groove; 99. Third elastic element; 90. Connecting block; 10. Neutral locking assembly; 11. Fourth elastic element; 12. Locking pawl. Detailed Implementation

[0008] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0009] Referring to Figures 1 to 6, a ratchet-type lifting device includes a fixed frame 1, a rotating shaft 2, a handle 3, a transmission disc 4, a shifting assembly 5, a reversing assembly 6, a power gear 7, and a rack 8. The rotating shaft 2 is rotatably mounted on the fixed frame 1; the handle 3 is fixedly connected to the rotating shaft 2; the transmission disc 4 is rotatably sleeved on the rotating shaft 2, and a transmission shaft 41 is rotatably threaded through the transmission disc 4; the shifting assembly 5 is located on one side of the transmission disc 4, and includes a transmission wheel 51, an operating block 52, a reset component 53, and two grippers. 54. The transmission wheel 51 is fixed on the rotating shaft 2. The gripper 54 is rotatably mounted on the transmission disk 4 and is used to lock the transmission wheel 51. The reset member 53 is connected to the gripper 54 to drive the gripper 54 to rotate towards the transmission wheel 51. The operating block 52 is fixed at one end of the transmission shaft 41 and located between the two grippers 54. The operating block 52 is used to drive the two grippers 54 away from each other to unlock the transmission wheel 51. The reversing assembly 6 is located on the other side of the transmission disk 4. The reversing assembly 6 includes a reversing ratchet 61 and a reversing block 6. 2. A first elastic element 63, a second elastic element 64, a first pawl 65, and a second pawl 66; a reversing ratchet 61 is rotatably mounted on the rotating shaft 2; the first pawl 65 and the second pawl 66 are rotatably mounted on the transmission disc 4; the first pawl 65 cooperates with the reversing ratchet 61 to limit the reversing ratchet 61 to rotate unidirectionally in a counterclockwise direction; the second pawl 66 cooperates with the reversing ratchet 61 to limit the reversing ratchet 61 to rotate unidirectionally in a clockwise direction; the first elastic element 63 connects the first pawl 65 and the transmission disc 4. The drive disc 4 drives the first pawl 65 to rotate toward the reversing ratchet 61. The second elastic element 64 connects the second pawl 66 and the drive disc 4 to drive the second pawl 66 to rotate toward the reversing ratchet 61. The reversing block 62 is fixed to the other end of the drive shaft 41 and is located between the first pawl 65 and the second pawl 66. The reversing block 62 is used to separate the first pawl 65 or the second pawl 66 from the reversing ratchet 61. The drive gear 7 is fixedly connected to the reversing ratchet 61. The rack 8 meshes with the drive gear 7.

[0010] As can be seen from the above description, the beneficial effects of the present invention are as follows: This ratchet-type lifting device has a novel structure, and through the cooperation of the shifting component 5 and the reversing component 6, it achieves labor-saving and safe lifting and adjusting of heavy-load components. In neutral, the two grippers 54 remain in contact with the operating block 52. The operating block 52 moves the two grippers 54 away from each other to unlock the transmission wheel 51, so that the transmission disc 4 is not connected to the rotating shaft 2. At this time, the reversing block 62 rotates with the transmission shaft 41 to a position where no pushing force is applied to the first pawl 65 and the second pawl 66. The first pawl 65 and the second pawl 66 engage with the reversing ratchet 61 under the action of their respective first elastic members 63 and second elastic members 64. The reversing ratchet 61 is locked in both directions and cannot rotate. When an external force is applied to the operating block 52, it causes the ratchet to engage with the reversing ratchet 61. After rotating a certain angle, the support distance between the two grippers 54 and the operating block 52 becomes shorter. Under the action of the reset member 53, the two grippers 54 move closer to each other to lock the transmission wheel 51. The transmission disc 4 and the rotating shaft 2 form a transmission connection. At the same time, the reversing block 62 rotates with the transmission shaft 41 to a position where the first pawl 65 or the second pawl 66 separates from the reversing ratchet 61. This selectively limits the reversing ratchet 61 to rotate unidirectionally in either a counterclockwise or clockwise direction. Thus, through the meshing transmission between the power gear 7 and the rack 8, the rack 8 can be raised or lowered. Based on this, the user only needs to pull the handle 3 to utilize the unidirectional transmission characteristic of the ratchet mechanism to convert intermittent manual pulling force into lifting driving force, effectively dispersing the operating force required to overcome heavy loads and achieving labor-saving adjustment.

[0011] Referring to Figures 4 and 7, the operating block 52 further includes an eccentrically positioned protrusion 524, and the shifting assembly 5 also includes a shifting disc 55 rotatably mounted on the rotating shaft 2. The shifting disc 55 is provided with a limiting groove 551 that cooperates with the protrusion 524.

[0012] As described above, the rotation of the shift disc 55 drives the rotation of the operating block 52, thereby realizing the shifting of gears. The shift disc 55 has a large volume and a large area for the user to apply force, making it convenient for the user to operate.

[0013] Please refer to Figures 3 and 4. Further, the shift disc 55 is provided with a gear position indicator 552, and the transmission disc 4 is provided with a gear position indicator 421 corresponding to the gear position indicator 552. Alternatively, it may also include a gear position indicator disc 42 connected to the transmission disc 4, and the gear position indicator disc 42 is provided with a gear position indicator 421 corresponding to the gear position indicator 552.

[0014] As described above, by setting a gear position indicator 552 on the gear shift plate 55 and setting a corresponding gear position indicator 421 on the transmission plate 4 or gear position indicator plate 42, users can intuitively identify the current gear position, making it convenient for users to select the up, down or neutral mode according to actual needs, which helps to improve the ease of operation and user experience of the ratchet lifting device.

[0015] Please refer to Figures 4 and 5. Further, the transmission wheel 51 is a ratchet structure or a gear structure.

[0016] As can be seen from the above description, the transmission wheel 51 adopts a ratchet structure or a gear structure, and the type of transmission wheel 51 can be flexibly selected according to different transmission requirements.

[0017] Referring to Figure 2, the handle 3 further includes two opposing rocker arms 31, both of which are fixedly connected to the rotating shaft 2, and the two rocker arms 31 are connected by a reinforcing rod 32.

[0018] As described above, by setting two opposing rocker arms 31 and connecting them with a reinforcing rod 32, a stable force transmission structure is formed. When the user operates the handle 3, the force can be distributed by both hands, reducing the intensity of single-handed operation. At the same time, the reinforcing rod 32 enhances the structural strength of the handle 3, which helps to improve the service life and operational stability of the handle 3.

[0019] Referring to Figure 3, further, the power gear 7 has a receiving cavity 71 on the side near the transmission disk 4, and the reversing assembly 6 is received in the receiving cavity 71.

[0020] As can be seen from the above description, by setting a receiving cavity 71 on the side of the power gear 7 near the transmission disk 4, the reversing component 6 is housed in the receiving cavity 71, thus realizing the integrated arrangement of the reversing component 6. This effectively reduces the axial space occupied by the ratchet-type lifting device, making the overall structure more compact. At the same time, the receiving cavity 71 protects the reversing component 6 and prevents external impurities from entering and affecting the transmission accuracy.

[0021] Referring to Figures 2, 12, and 13, the system further includes a lifting rod 81 and a locking mechanism 9. The rack 8 is fixed to the lifting rod 81. The locking mechanism 9 includes a locking component 91, which includes a cooperating movable clamping block 911 and a sliding block 912. The sliding block 912 has a first guide slope 9121 and an abutting portion 9122 for abutting against the handle 3. The movable clamping block 911 has a second guide slope 9111 that cooperates with the first guide slope 9121 and an abutting surface 9112 for pressing against the lifting rod 81.

[0022] As described above, by setting the locking mechanism 9, after the lifting adjustment is completed, the lowered handle 3 pushes the sliding block 912, so that the sliding block 912 pushes the movable clamping block 911 to press against the lifting rod 81 through the cooperation of the first guide inclined surface 9121 and the second guide inclined surface 9111, thereby realizing the mechanical locking of the position of the lifting rod 81, preventing the heavy load component from being accidentally displaced after the adjustment is completed, and helping to improve the safety and reliability of the ratchet lifting device.

[0023] Please refer to Figures 2, 12 and 13. Further, the locking mechanism 9 includes two sets of locking components 91 arranged opposite to each other. The movable clamping blocks 911 are respectively provided on the opposite sides of the lifting rod 81. The two sliding blocks 912 are connected by connecting blocks 92 to form a U-shaped structure.

[0024] As described above, by setting two sets of locking components 91 arranged opposite to each other, and by setting movable clamping blocks 911 on opposite sides of the lifting rod 81 respectively, and by forming a U-shaped structure with two sliding blocks 912 connected by connecting block 92, the lifting rod 81 is clamped and locked on both sides simultaneously, making the locking force distribution more uniform and improving the stability and reliability of the locking effect.

[0025] Referring to Figure 13, the locking component 91 further includes a third elastic element 913, which is used to drive the sliding block 912 to retract.

[0026] As described above, by setting a third elastic element 913 to connect the fixed frame 1 and the sliding block 912, when the handle 3 does not contact the sliding block 912, the third elastic element 913 drives the sliding block 912 to retract, so that the movable clamp 911 automatically releases the lifting rod 81, realizing the automatic release of the locked state, which makes it convenient for the user to perform the next lifting adjustment operation and improves the ease of operation of the ratchet lifting device.

[0027] Referring to Figure 2, further, one of the fixing frame 1 and the handle 3 is provided with a ball-head plunger 13, and the other is provided with a positioning port 33 that cooperates with the ball-head plunger 13.

[0028] As described above, the cooperation between the ball plunger 13 and the positioning port 33 can lock the handle 3, so that the handle 3 can always keep in contact with the contact part 9122, thereby preventing the locking mechanism 9 from being unlocked unexpectedly, which helps to improve the working stability of the ratchet lifting device.

[0029] Referring to Figures 1 and 14, the system further includes a neutral locking assembly 10. The neutral locking assembly 10 includes a fourth elastic element 101 and a locking pawl 102 that cooperates with the power gear 7. The locking pawl 102 is rotatably mounted on the fixed frame 1. The fourth elastic element 101 connects the fixed frame 1 and the locking pawl 102 to drive the locking pawl 102 to move toward the power gear 7.

[0030] As described above, in the neutral state, the locking pawl 102 cooperates with the drive gear 7 under the action of the fourth elastic element 101, realizing additional locking protection for the drive gear 7, preventing the rack 8 from being displaced due to the rotation of the reversing ratchet 61 caused by accidental external force, and further improving the safety and reliability in the neutral state.

[0031] Embodiment 1 of the present invention is: a ratchet-type lifting device, applied in fitness equipment, such as the lifting system of the handlebars of a stationary bicycle, the seat lifting system, etc.

[0032] Referring to Figures 1 to 6, the ratchet-type lifting device includes a fixed frame 1, a rotating shaft 2, a handle 3, a transmission disc 4, a shifting assembly 5, a reversing assembly 6, a power gear 7, and a rack 8. The rotating shaft 2 is rotatably mounted on the fixed frame 1; the handle 3 is fixedly connected to the rotating shaft 2, and the rotation of the handle 3 drives the rotating shaft 2 to rotate; the transmission disc 4 is rotatably sleeved on the rotating shaft 2, and a transmission shaft 41 is rotatably threaded through the transmission disc 4; the shifting assembly 5 is located on one side of the transmission disc 4, and the shifting assembly 5 includes a transmission wheel 51, an operating block 52, a reset component 53, and two grippers 54. The drive wheel 51 is fixed on the rotating shaft 2. The rotation of the rotating shaft 2 will drive the drive wheel 51 to rotate. The gripper 54 is rotatably mounted on the transmission disk 4 and is used to lock the drive wheel 51. The reset member 53 is connected to the gripper 54 to drive the gripper 54 to rotate in a direction closer to the drive wheel 51. The operating block 52 is fixed at one end of the transmission shaft 41 and located between the two grippers 54. The operating block 52 is used to drive the two grippers 54 away from each other to unlock the drive wheel 51. The reversing assembly 6 is located on the other side of the transmission disk 4. The reversing assembly 6 includes a reversing ratchet 61 and a reversing block 62. A first elastic element 63, a second elastic element 64, a first pawl 65, and a second pawl 66 are provided. A reversing ratchet 61 is rotatably mounted on a rotating shaft 2. The first pawl 65 and the second pawl 66 are rotatably mounted on a transmission disk 4. The first pawl 65 cooperates with the reversing ratchet 61 to limit the reversing ratchet 61 to rotate unidirectionally in a counterclockwise direction. The second pawl 66 cooperates with the reversing ratchet 61 to limit the reversing ratchet 61 to rotate unidirectionally in a clockwise direction. The first elastic element 63 connects the first pawl 65 to the transmission disk 4 to drive the first pawl 65 towards the reversing ratchet 61. When the wheel 61 rotates in one direction, the second elastic element 64 connects the second pawl 66 to the transmission disc 4 to drive the second pawl 66 to rotate toward the reversing ratchet 61. The reversing block 62 is fixed at the other end of the transmission shaft 41 and is located between the first pawl 65 and the second pawl 66. The reversing block 62 is used to separate the first pawl 65 or the second pawl 66 from the reversing ratchet 61. The drive gear 7 is fixedly connected to the reversing ratchet 61. The rack 8 can be raised and lowered relative to the fixed frame 1. The rack 8 meshes with the drive gear 7. The rotation of the drive gear 7 will drive the rack 8 to rise and fall.

[0033] The first elastic element 63 can be selected from springs, tension springs, sheet springs, elastic bands, etc., and the second elastic element 64 can be selected from springs, tension springs, sheet springs, elastic bands, etc.

[0034] Referring to Figures 6 and 7, in this embodiment, the operating block 52 has two parallel first contact surfaces 521, two parallel second contact surfaces 522, and two parallel third contact surfaces 523. The distance between the two first contact surfaces 521 is greater than the distance between the two second contact surfaces 522 and the distance between the two third contact surfaces 523. The grippers 54 are used for a first mating surface that contacts the first contact surface 521, a second mating surface that contacts the second contact surface 522, and a third mating surface that contacts the third contact surface 523. When the first contact surface 521 is in contact with the first mating surface, the operating member and the two grippers 54 are in a dead-point state, so the operating block 52 will not rotate unexpectedly. Similarly, when the operating block 52 is rotated so that the second contact surface 522 is in contact with the second mating surface or the third contact surface 523 is in contact with the third mating surface, the operating member and the two grippers 54 are also in a dead-point state.

[0035] Referring to Figures 4 to 7, when the ratchet-type lifting device is in neutral, under the action of the reset member 53, the first contact surface 521 contacts the first mating surface. At this time, the distance between the two grippers 54 reaches its maximum, and both grippers 54 separate from the transmission wheel 51, thereby unlocking the transmission wheel 51. The kinetic energy of the rotating shaft 2 cannot be transmitted to the transmission disk 4 through the cooperation of the transmission wheel 51 and the grippers 54. Referring to Figures 8 to 11, when the second contact surface 522 contacts the second mating surface, or when the third contact surface 523 contacts the third mating surface, under the action of the reset member 53, the distance between the two grippers 54 decreases, and both contact the transmission wheel 51, thereby locking the transmission wheel 51. The kinetic energy of the rotating shaft 2 can be transmitted to the transmission disk 4 through the cooperation of the transmission wheel 51 and the grippers 54.

[0036] Referring to Figure 3, the number of reset components 53 can be one or two. When there is one reset component 53, the reset component 53 is connected to two grippers 54. When there are two reset components 53, one reset component 53 is connected to one gripper 54 and the transmission disk 4, and the other reset component 53 is connected to the other gripper 54 and the transmission disk 4. The reset component 53 can be selected from springs, tension springs, spring sheets, elastic bands, etc.

[0037] Referring to Figures 3 and 4, in one or more embodiments, the operating block 52 has an eccentrically positioned protrusion 524. The user controls the rotation of the operating block 52 by operating the protrusion 524. To facilitate user operation, in some embodiments, referring to Figures 3 to 5, the shifting assembly 5 further includes a shifting disc 55 rotatably sleeved on the rotating shaft 2. The shifting disc 55 has a limiting groove 551 that cooperates with the protrusion 524, so that the rotation of the rotating shaft 2 will not drive the shifting disc 55. Optionally, the limiting groove 551 is arranged radially along the shifting disc 55.

[0038] Referring to Figures 3 to 5, to facilitate accurate identification of the current gear position of the ratchet-type lifting device by the user, a gear position indicator 552 is provided on the gear shift disc 55. In some embodiments, the gear position indicator 552 is a notch. In one or more embodiments, the ratchet-type lifting device further includes a gear position indicator disc 42 connected to the transmission disc 4. The gear position indicator disc 42 is provided with gear position indicators 421 corresponding to the gear position indicator 552. Specifically, there are multiple sets of gear position indicators 421, which are distributed circumferentially along the gear position indicator disc 42. Each set of gear position indicators 421 includes a downshift indicator 421, a neutral indicator, and an upshift indicator 421 arranged sequentially. In some embodiments, the gear position indicator disc 42 and the transmission disc 4 can be an integrally formed structural component. In other embodiments, the gear position indicator 421 corresponding to the gear position indicator 552 can also be directly provided on the transmission disc 4.

[0039] When the transmission wheel 51 is a ratchet structure, the gripper 54 is a pawl; referring to Figures 3 to 5, when the transmission wheel 51 is a gear structure, the gripper 54 is a pawl; when the transmission wheel 51 is a friction wheel, the gripper 54 is a contact brake pawl. It can be seen that the specific structure of the transmission wheel 51 is diverse and can be flexibly selected.

[0040] In some embodiments, the handle 3 is a single rocker arm 31 structure. Referring to Figure 1, in one or more embodiments, the handle 3 includes two oppositely arranged rocker arms 31. Both rocker arms 31 are fixedly connected to the rotating shaft 2, and the two rocker arms 31 are connected by a reinforcing rod 32.

[0041] Referring to Figure 3, to reduce the axial dimension of the ratchet-type lifting device and make its structure more compact, in one or more embodiments, the power gear 7 has a receiving cavity 71 on the side near the transmission disc 4, and the reversing assembly 6 is received in the receiving cavity 71. When the ratchet-type lifting device has the gear indicator disc 42, in some embodiments, the transmission disc 4 can also be received in the receiving cavity 71.

[0042] Referring to Figures 2, 12, and 13, the ratchet-type lifting device further includes a lifting rod 81 and a locking mechanism 9. The rack 8 is fixed to the lifting rod 81. The locking mechanism 9 includes a locking component 91, which includes a cooperating movable clamping block 911 and a sliding block 912. The sliding block 912 has a first guide slope 9121 and an abutting portion 9122 for abutting against the handle 3. The movable clamping block 911 has a second guide slope 9111 that cooperates with the first guide slope 9121 and an abutting surface 9112 for pressing against the lifting rod 81. In one or more embodiments, the movable clamping block 911 is slidable along a lifting direction perpendicular to the rack 8. In some embodiments, the movable clamping block 911 includes a connected sliding clamping block 9113 and a contact pad 9114. The second guide slope 9111 is located on the side of the sliding clamping block 9113 away from the lifting rod 81. The contact pad 9114 is located on the side of the sliding clamping block 9113 close to the lifting rod 81. The movable clamping block 911 abuts against the lifting rod 81 through the contact pad 9114 to lock the lifting rod 81. The contact pad 9114 is one of a rubber pad and a plastic pad.

[0043] When a ratchet-type lifting device is applied to the handlebar system of a stationary bike, the lifting rod 81 is a neck tube.

[0044] Referring to Figures 12 and 13, in some embodiments, the fixing frame 1 is provided with a protective cover 11. At least a portion of the sliding block 912, having one end with the first guide slope 9121 and the movable clamping block 911, is located within the protective cover 11. The protective cover 11 prevents external dust and other impurities from adhering to the second guide slope 9111, thus ensuring the working stability of the locking mechanism 9. In some embodiments, the protective cover 11 is further provided with a guide post 12, and the sliding block 912 is provided with a guide groove 9123 that cooperates with the guide post 12. The length direction of the guide groove 9123 is consistent with the sliding direction of the sliding block 912.

[0045] In one or more embodiments, the locking mechanism 9 includes two sets of locking components 91 arranged opposite to each other, the movable clamping blocks 911 are respectively provided on opposite sides of the lifting rod 81, and the two sliding blocks 912 are connected by connecting blocks 92 to form a U-shaped structure.

[0046] Referring to Figure 12, the locking assembly 91 further includes a third elastic element 913, which is used to drive the sliding block 912 to retract. The third elastic element 913 can be a spring, tension spring, sheet spring, elastic band, etc. In some embodiments, the third elastic element 913 connects the sliding block 912 to the fixing frame 1 or the protective cover 11. In other embodiments, the third elastic element 913 connects the movable clamping block 911 to the fixing frame 1 or the protective cover 11.

[0047] Please refer to Figure 2. To prevent the handle 3 from rotating unexpectedly when it is lowered to the limit position, one of the fixing frame 1 and the handle 3 is provided with a ball plunger 13, and the other is provided with a positioning port 33 that cooperates with the ball plunger 13.

[0048] Referring to Figures 1 and 14, to improve the safety of the ratchet-type lifting device, the ratchet-type lifting device also includes a neutral locking assembly 10. The neutral locking assembly 10 includes a fourth elastic element 101 and a locking pawl 102 that cooperates with the power gear 7. The locking pawl 102 is rotatably mounted on the fixed frame 1. The fourth elastic element 101 connects the fixed frame 1 and the locking pawl 102 to drive the locking pawl 102 to move towards the power gear 7. The fourth elastic element 101 can be selected from springs, tension springs, sheet springs, elastic bands, etc.

[0049] The working principle of this ratchet-type lifting device is briefly described as follows: Please refer to Figures 3 to 6. When the gear position indicator 552 on the shift disc 55 indicates the neutral position, the ratchet-type lifting device is in the neutral state. Under the action of the reset member 53, the first contact surface 521 and the first mating surface come into contact. At this time, the distance between the two grippers 54 reaches its maximum, and both grippers 54 are separated from the transmission wheel 51, thereby unlocking the transmission wheel 51. At this time, although the first pawl 65 and the second pawl 66 are both engaged with the reversing ratchet 61, the user's operation handle 3 will not cause the power gear 7 to rotate. The neutral locking component 10 locks the power gear 7 to prevent the rack 8 from falling unexpectedly due to gravity load.

[0050] Referring to Figures 8 and 9, with the neutral position as the initial state, when the shift disc 55 rotates counterclockwise, causing the operating block 52 to rotate counterclockwise, under the action of the reset member 53, the second contact surface 522 and the second mating surface come into contact, the distance between the two grippers 54 decreases, and both grippers 54 abut against the transmission wheel 51, thereby locking the transmission wheel 51; at this time, the reversing block 62 pushes the first pawl 65 away, causing the first pawl 65 to disengage from the reversing ratchet 61, and the second pawl 66 continues to engage with the reversing ratchet 61 under the action of the second elastic member 64, forming a kinetic energy transmission chain of rotating shaft 2-transmission wheel 51-gripper 54-transmission disc 4-second pawl 66-reversing ratchet 61-power gear 7. When the user presses down the handle 3, the second pawl 66 slips out and does not push the reversing ratchet 61 to rotate. At this time, the neutral locking assembly 10 locks the drive gear 7 to prevent the rack 8 from falling unexpectedly due to gravity load. When the user lifts the handle 3, the second pawl 66 pushes the reversing ratchet 61 to drive the drive gear 7 to rotate. The drive gear 7 overcomes the locking force of the locking pawl 102 and drives the rack 8 to fall.

[0051] Referring to Figures 10 and 11, with the neutral position as the initial state, when the shift disc 55 rotates clockwise, causing the operating block 52 to rotate clockwise, under the action of the reset member 53, the third contact surface 523 and the third mating surface come into contact, the distance between the two grippers 54 decreases, and both grippers 54 abut against the transmission wheel 51, thereby locking the transmission wheel 51; at this time, the reversing block 62 pushes the second pawl 66 away, causing the second pawl 66 to disengage from the reversing ratchet 61, and the first pawl 65 continues to engage with the reversing ratchet 61 under the action of the first elastic member 63, forming a kinetic energy transmission chain of shaft 2-transmission wheel 51-gripper 54-transmission disc 4-first pawl 65-reversing ratchet 61-power gear 7. When the user presses down the handle 3, the first pawl 65 pushes the reversing ratchet 61 to drive the power gear 7 to rotate. The power gear 7 overcomes the locking force of the locking pawl 102 and drives the rack 8 to rise. However, when the user lifts the handle 3, the first pawl 65 slips out and will not push the reversing ratchet 61 to rotate. At this time, the neutral locking assembly 10 locks the power gear 7 to prevent the rack 8 from falling unexpectedly due to gravity load.

[0052] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A ratchet-type lifting device, characterized in that, The system includes a fixed frame; a rotating shaft rotatably mounted on the fixed frame; a handle fixedly connected to the rotating shaft; a transmission disc rotatably mounted on the rotating shaft, with the transmission shaft rotatably passing through it; a shifting assembly located on one side of the transmission disc, including a transmission wheel, an operating block, a reset element, and two grippers. The transmission wheel is fixed to the rotating shaft, the grippers are rotatably mounted on the transmission disc and used to lock the transmission wheel, the reset element connects to the grippers to drive the grippers to rotate towards the transmission wheel, the operating block is fixed to one end of the transmission shaft and located between the two grippers, and the operating block is used to drive the two grippers away from each other to unlock the transmission wheel; and a reversing assembly located on the other side of the transmission disc, including a reversing ratchet, a reversing block, a first elastic element, a second elastic element, a first pawl, and a second pawl. A ratchet is rotatably mounted on a rotating shaft. A first pawl and a second pawl are rotatably mounted on a transmission disc. The first pawl engages with the reversing ratchet to limit its unidirectional rotation in a counterclockwise direction, and the second pawl engages with the reversing ratchet to limit its unidirectional rotation in a clockwise direction. A first elastic element connects the first pawl to the transmission disc to drive the first pawl to rotate towards the reversing ratchet. A second elastic element connects the second pawl to the transmission disc to drive the second pawl to rotate towards the reversing ratchet. A reversing block is fixed to the other end of the transmission shaft and located between the first and second pawls. The reversing block is used to separate the first or second pawl from the reversing ratchet. A drive gear is fixedly connected to the reversing ratchet. A rack meshes with the drive gear.

2. The ratchet-type lifting device according to claim 1, characterized in that, The operating block has an eccentrically positioned protrusion, and the shifting assembly also includes a shifting disc rotatably sleeved on a rotating shaft, the shifting disc having a limiting groove that cooperates with the protrusion.

3. The ratchet-type lifting device according to claim 2, characterized in that, The shift disc is provided with a gear position indicator, and the transmission disc is provided with a gear position indicator corresponding to the gear position indicator. Alternatively, it may also include a gear position indicator disc connected to the transmission disc, and the gear position indicator disc is provided with a gear position indicator corresponding to the gear position indicator.

4. The ratchet-type lifting device according to claim 1, characterized in that, The handle includes two opposing rocker arms, both of which are fixedly connected to the rotating shaft and are connected by a reinforcing rod.

5. The ratchet-type lifting device according to claim 1, characterized in that, The power gear has a receiving cavity on the side near the transmission disk, and the reversing assembly is housed in the receiving cavity.

6. The ratchet-type lifting device according to claim 1, characterized in that, It also includes a lifting rod and a locking mechanism. The rack is fixed on the lifting rod. The locking mechanism includes a locking component. The locking component includes a cooperating movable clamping block and a sliding block. The sliding block has a first guide slope and an abutting portion for abutting against the handle. The movable clamping block has a second guide slope that cooperates with the first guide slope and an abutting surface for pressing against the lifting rod.

7. The ratchet-type lifting device according to claim 6, characterized in that, The locking mechanism includes two sets of locking components arranged opposite to each other. The movable clamping blocks are respectively provided on the opposite sides of the lifting rod. The two sliding blocks are connected by a connecting block to form a U-shaped structure.

8. The ratchet-type lifting device according to claim 6, characterized in that, The locking assembly further includes a third elastic element for driving the sliding block to retract.

9. The ratchet-type lifting device according to claim 6, characterized in that, One of the fixing frame and the handle is provided with a ball-head plunger, and the other is provided with a positioning port that mates with the ball-head plunger.

10. The ratchet-type lifting device according to claim 1, characterized in that, It also includes a neutral locking assembly, which includes a fourth elastic element and a locking pawl that cooperates with the drive gear. The locking pawl is rotatably mounted on a fixed frame, and the fourth elastic element connects the fixed frame and the locking pawl to drive the locking pawl to move toward the drive gear.

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