Lifting device

Abstract

To provide a lifting device that has an effective fall prevention function even in the event of mechanical failure. [Solution] A lifting device comprising a housing 10, a traction member rotatable about an axis and positioned on the housing and including a load portion and a first engagement portion, a transmission device configured to transmit driving force for rotating the traction member, a first brake device 30 connected to the transmission device and configured to restrict the rotational movement of the traction member in a predetermined direction, and a second brake device 40, wherein the second brake device includes a side plate 41 connected to the housing and having a fixed engagement structure mounted around the axis, a rotating disc connected to the first engagement portion of the traction member, and a plurality of locking latches positioned on the rotating disc and configured to engage with the fixed engagement structure.

Description

Technical Field

[0001] The present invention relates to a lifting device. Background Art

[0002] Lifting devices such as lever hoists, chain blocks and winches are mechanical devices widely used in various industries including material transportation, construction, maintenance and safety measures. These devices use load chains or ropes as supporting or traction elements, and are designed to lift, lower or pull suspended loads by manual operation, compressed air or power from electric motors. In particular, lever hoists are commonly used in overhead transmission line construction, personal safety protection, and scenarios involving inversion of suspended loads due to their compact and lightweight design and reliable mechanical operation.

[0003] A conventional lever hoist comprises basic components including a protective housing, an ergonomically designed hand lever, a round steel chain for attaching to a suspended load, a safety hook for connection points, and a brake mechanism designed to control the movement of the suspended load during operation. Its operating principle is that an operator applies a controlled force to the hand lever, power is transmitted through a complex arrangement of gears and transmission components, and the suspended load attached to the load chain is thus lifted or lowered. However, safety considerations are still of great importance in the operation of lever hoists. This is because when a mechanical failure or brake malfunction occurs, the suspended load may descend in an uncontrolled manner, posing a serious risk to the safety of workers and causing property damage. Summary of the Invention Problem to be Solved by the Invention

[0004] Therefore, there is a need for an improved design of a lifting device that can provide an effective fall prevention function even when the aforementioned mechanical failure occurs. Means for Solving the Problem

[0005] In some embodiments of this disclosure, the lifting device improves the safety and reliability of lifting operations in a variety of industrial applications. The lifting device is suitable for any application where personnel safety and load control are critical, such as construction, manufacturing, logistics, maintenance, and utilities.

[0006] According to one embodiment of the present disclosure, a lifting device is provided. The lifting device comprises a housing; a traction member rotatable about an axis and positioned on the housing, including a loading portion and a first engagement portion; a transmission assembly configured to transmit a driving force for rotating the traction member; a first brake device connected to the transmission assembly and configured to restrict the rotational movement of the traction member in a predetermined direction; and a second brake device. The second brake device comprises a side plate connected to the housing and having fixed engagement structures mounted around an axis; a rotating disc connected to the first engagement portion of the traction member; and a plurality of locking latches positioned on the rotating disc and configured to engage with the mounted engagement structures.

[0007] The embodiments of this disclosure are best understood by reading the following detailed description in conjunction with the accompanying drawings. Note that, in accordance with standard industry practice, the structures are not drawn to scale. In fact, for the sake of clarity, the dimensions of the structures can be arbitrarily enlarged or reduced. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a block diagram of a lifting device according to a first embodiment of the present disclosure. [Figure 2] Figure 2 is an illustrative perspective view of a lifting device according to the first embodiment. [Figure 3] Figure 3 is an exemplary partial perspective view of the lifting device shown in Figure 2. [Figure 4]Figure 4 is an exploded view of an exemplary component of the lifting device shown in Figure 2. [Figure 5] Figure 5 is an exemplary partial perspective view of the lifting device shown in Figure 2. [Figure 6] Figure 6 is an exemplary side view of the lifting device shown in Figure 2, illustrating the second brake device in a normal operating state. [Figure 7] Figure 7 is an exemplary side view of the lifting device shown in Figure 2, illustrating the second brake device operating in an abnormal state due to excessive rotational speed. [Figure 8] Figure 8 is a block diagram of a lifting device according to a second embodiment of the present disclosure. [Figure 9] Figure 9 is a perspective view of a lifting device according to a third embodiment of the present disclosure. [Figure 10] Figure 10 is a block diagram of a lifting device according to a fourth embodiment of the present disclosure. [Figure 11] Figure 11 is an exploded view of a lifting device according to a fourth embodiment of the present disclosure. [Figure 12] Figure 12 is an exploded view showing some of the components of the lifting device shown in Figure 11. [Figure 13] Figure 13 is a block diagram of a lifting device according to a fifth embodiment of the present disclosure. [Figure 14] Figure 14 is an exploded view of a lifting device according to a fifth embodiment of the present disclosure. [Figure 15] Figure 15 is an exploded view showing some of the components of the lifting device shown in Figure 14. [Modes for carrying out the invention]

[0009] This disclosure provides numerous different embodiments, or examples, for realizing various features of the subject matter. For brevity, specific examples of elements and configurations are given below. These are examples only and are not intended to be limiting. For example, the method of forming a first feature above or on top of a second feature as described later includes embodiments in which the first and second features are formed in direct contact, and also includes embodiments in which an additional feature is formed between the first and second features, and the first and second features are not in direct contact. Furthermore, reference numbers and / or reference letters may be repeated in various embodiments of this disclosure. This repetition is for brevity and clarity and does not in itself define the relationships between the various embodiments and / or configurations described.

[0010] Furthermore, as shown in the figures, spatial relative terms such as “downward,” “below,” “low,” “upward,” “above,” “on top,” and “above” may be used in this specification for convenience in describing the relationship between one element or feature and another. These spatial relative terms are intended to encompass various orientations of the device during use or operation, in addition to the orientation shown in the figures. The device may also be positioned in other orientations (90-degree rotation or other orientations), and the spatial relative descriptors used herein may be interpreted accordingly.

[0011] As used herein, terms such as “First,” “Second,” and “Third” describe various elements, components, areas, layers, and / or sections, and these elements, components, areas, layers, and / or sections are not limited by these terms. These terms are used solely to distinguish one element, component, area, layer, or section from other elements, components, areas, layers, or sections. Unless explicitly indicated in the context, terms such as “First,” “Second,” and “Third” as used herein do not imply order or sequence.

[0012] As used in the present specification, the terms "about", "substantially", "substantial", and "approximately" are used to describe and account for minor variations. When used in connection with an event or circumstance, these terms can refer to both the case where the event or circumstance occurs exactly and the case where the event or circumstance occurs approximately exactly.

[0013] According to an embodiment of the present disclosure, a lever hoist includes a dual brake system including a primary service brake and a secondary brake to improve safety. The primary service brake is mounted on a drive shaft, and a ratchet tightens the drive shaft when an operator stops applying torque via a hand lever. The secondary brake is coaxially mounted on the same drive shaft. When the primary service brake fails, the secondary brake prevents rotation of the drive shaft, and indirectly also prevents rotation of the chain wheel.

[0014] However, since the secondary brake is directly connected to the drive shaft, the safety margin of the system is impaired when multiple components fail at the same time. Specifically, if the primary service brake fails to operate properly due to mechanical failure, corrosion, or ice formation, and at the same time the drive shaft is damaged or a mechanical failure occurs in the transmission, the secondary brake cannot stop the rotation of the load chain wheel. This failure scenario creates a safety hazard in that a suspended load may fall rapidly and uncontrollably, leading to catastrophic accidents, property damage, and serious injury to workers.

[0015] To solve the problems of the above embodiments, some embodiments of the present disclosure provide an improved lifting device design including an independent safety mechanism that operates independently of the drive shaft or transmission system, so that the fall prevention function can be maintained even under severe component failure conditions.

[0016] Referring to Fig. 1, in one embodiment, the lifting apparatus 1 comprises a robust housing 10 that comprehensively structurally supports internal operating components and protects them from the environment. The housing 10 comprises a first housing plate 11 and a second housing plate 12 that protect the internal mechanism from environmental factors such as mechanical impact, which may impair operating performance and service life. The first housing plate 11 is arranged adjacent to the operation control device, and the second housing plate 12 accommodates transmission components.

[0017] According to one embodiment shown in Fig. 2, the lifting apparatus 1 may further comprise a plurality of additional structural components such as a fixing hook 13, a loading hook 14, and a chain 15, which contribute to the overall operational efficiency and safety. The fixing hook 13 is fixedly attached to the housing 10 and provides a connection point for fixing the apparatus to a fixed support structure such as a ceiling beam, a crane system, or other mounting points. This connection provides a reliable fixing point capable of withstanding operating forces and load requirements, enabling stable operation.

[0018] The chain 15 is generally formed of a high-strength steel structure, passes through the load portion 21 of the traction member 20, and provides a mechanical connection between the apparatus and a suspended suspended load. The loading hook 14 is connected to the chain 15 and provides an interface for attaching the suspended load to be lifted and lowered. The loading hook 14 is designed to accommodate various suspended load attachment configurations while maintaining reliable connection throughout the entire operating cycle.

[0019] Referring to Fig. 1, the lifting apparatus 1 comprises a traction member 20 (also referred to as a loading chain wheel) rotatably mounted in the housing 10 about an axis L1, and functions as a component for loading operation and control. The traction member 20 is directly connected to a chain or the like used for lifting operation. According to one embodiment shown in Fig. 4, the traction member 20 comprises a plurality of independent functional portions that contribute to its operating efficiency, such as a load portion 21, a first engaging portion 22, a second engaging portion 23, a first extending portion 24, and a second extending portion 25.

[0020] The load section 21 is configured to connect to a chain or rope (such as a wire rope) and has a surface shape that allows the traction member 20 to retract or unwind the chain or rope by rotational motion, making it easy to accurately lift and lower loads attached to the loading hook. This connection interface is designed to minimize chain wear while maximizing grip and controllability during operation. The first engagement section 22 and the second engagement section 23 provide interfaces for the braking and transmission mechanisms, respectively, ensuring that mechanical forces are properly distributed and controlled throughout the entire operating cycle. These engagement sections are machined to maintain a secure mechanical connection with the associated components. The first extension section 24 and the second extension section 25 are positioned between the load section 21 and their respective engagement sections, providing structural spacing and alignment within the housing plate and contributing to overall mechanical stability. These extension sections also play a role in distributing mechanical stress throughout the traction member structure, improving durability under high load conditions. The load portion 21, the first engaging portion 22, the second engaging portion 23, the first extension portion 24, and the second extension portion 25 are integrally molded by an appropriate manufacturing process such as forging.

[0021] Referring again to Figure 1, the traction member 20 has a hollow channel 26 extending along the axis L1. The hollow channel 26 is configured to allow components such as the load shaft 16 to pass through. The load shaft 16 passes through the hollow channel 26 and extends along the axis L1 from a first end 161 to a second end 162. The load shaft 16 functions as an element that transmits torque from the operating member 60 to the traction member 20 along the path indicated by the arrow in Figure 1.

[0022] The lifting device 1 further includes a transmission assembly 50 configured to efficiently transmit driving force to rotate the traction member 20, and the coordinated operation of multiple components provides mechanical advantages and efficient force transmission, enabling the operator to handle loads heavier than would be possible with direct mechanical connections. In one embodiment, the device includes gears 51, 52, 53, and 54, which form a multi-stage gear train to amplify the mechanical advantages and enable the operator to lift heavier loads with less physical effort.

[0023] Gear 51 is directly connected to the second end 162 of the load shaft 16 and functions as the input gear of the transmission system. This gear meshes with gear 52, which is mounted together with gear 53 on the rotating shaft L2 or L3. The combination of gears 52 and 53 provides an intermediate mechanical advantage within the transmission train. Gear 53 meshes with gear 54, which is connected to the second engagement portion 23 of the traction member 20, completing the power transmission path from the load shaft to the traction member. This multi-stage gear mechanism allows the operator to lift heavy loads by applying a controllable level of force. The gears also have a reduction function, allowing for precise positioning and control of the load during lifting operations.

[0024] Furthermore, the lifting device 1 includes a first brake device 30 that functions as a load control mechanism. In some embodiments, the first brake device 30 controls the rotation of the traction member 20 during normal operation to prevent the suspended load from descending unintentionally. In one embodiment shown in Figure 3, the first brake device 30 is a Weston-Style load brake and comprises a gear 31, one or more pawls 32, and one or more elastic members 33.

[0025] The gear 31 is fixed to the load shaft 16 at a position between the traction member 20 and the first end 161. One or more pawls 32 are configured to provide a mechanical interface for controlling the rotation of the gear 31. These latches engage with the teeth of the gear via a ratchet mechanism, allowing rotation in the upward and downward directions, while preventing rotation in the downward direction unless explicitly operated by the operator. Elastic members 33, such as precision springs, bias the ratchet pawls 32 to engage with the gear 31, facilitating automatic engagement when the operator is not actively controlling the system. This mechanism ensures controlled movement of the suspended load while preventing unintended descent that could create a safety hazard. The pawls 32 and elastic members 33 can be mounted to fixed components of the lifting device 1, for example, the first housing plate 11 or the side plate 41 of the second brake device 40, as described later.

[0026] As shown in Figure 1, in addition to the safety provided by the first brake device 30, the lifting device 1 is also equipped with a second brake device 40 to further enhance safety. The second brake device 40 acts directly on the traction member 20 and provides an effective fall prevention function in the event of a malfunction or failure of the first brake device 30 or transmission components. In some embodiments, the second brake device 40 comprises a side plate 41 and a fall prevention device 46. The side plate 41 is securely fixed to the housing 10, and the fall prevention device 46 is directly fixed to the first engagement portion 22 of the traction member 20, so that synchronous rotation occurs between the fall prevention device and the traction member.

[0027] According to the embodiment shown in Figure 4, the side plate 41 has a through hole 411 aligned in a straight line with the axis L1, through which the first engaging portion 22 of the traction member 20 passes. The side plate 41 further includes a fixed engaging structure 412 arranged circumferentially along the inner edge of the through hole 411. The engaging structure 412 may have a plurality of teeth or notches.

[0028] The fall prevention device 46 comprises a rotating disc 42, a plurality of locking latches 43, a plurality of springs 44, and a cover 45. The rotating disc 42 is directly fixed to a first engagement portion 22 of the traction member 20. The outer surface of the first engagement portion 22 may be formed to have a non-circular contour, such as a hexagon or other polygonal shape having a plurality of flat surfaces or edges, while the inner circumference of the rotating disc 42 is correspondingly formed to have a complementary contour that matches the outer surface shape of the adapter. The rotating disc 42 has an upper surface 421 with a plurality of grooves 422 formed therein. Each groove 422 houses a locking latch 43 that functions as an engagement element of a secondary brake system. The locking latches 43 are configured to rotate outward by centrifugal force when the rotational speed exceeds a predetermined safety threshold, thereby operating automatically without requiring operator intervention or an external control system.

[0029] Each locking latch 43 has an inner end 431 with a lower projection 434 and an upper projection 433, which rotatably engage with a first positioning hole 423 on the rotating disk 42 and a second positioning hole 451 on the cover 45, respectively. This dual pivot point configuration provides stable mechanical support while enabling smooth rotation under centrifugal force. Each locking latch 43 has an outer end 432 connected to a spring 44. The spring 44 is connected to the outer end 432 of the locking latch 43 and provides a controlled biasing force to hold the locking latch 43 in the retracted position during normal operation. This spring biasing prevents engagement with the fixed engagement structure 412 under normal operating conditions, while enabling automatic deployment in emergencies. Furthermore, the biasing force of the spring 44 is set to prevent premature engagement under fluctuations associated with normal operation, while ensuring that the threshold speed required for operation is reliably maintained. The cover 45 is positioned to cover the upper surface 421 of the rotating disk 42, protecting the lock latch 43 and spring 44 from the external environment, and also providing structural support for the mechanism. The cover 45 can be fixed to the rotating disk 42 using fasteners such as screws.

[0030] In some embodiments, the lifting device 1 also includes an operating member 60. The operating member 60 may include a manual lever 61, as shown in Figure 2. The manual lever 61 serves as the primary human interface for controlling the operation of the lifting device. The manual lever 61 may be designed to minimize operator fatigue during prolonged operation while providing sufficient leverage to enable effective load control. In some embodiments, the operating member 60 is connected to a gear 31 via a known mechanism. When the operator reciprocates the manual lever 61 during operation, the load force from the manual lever 61 is transmitted to the load shaft 16 via the gear 31, causing the load shaft 16 to rotate in steps. This rotation is transmitted to the traction member 20 via a transmission assembly 50, thereby controlling the winding or unwinding of the chain 15 or wire rope connected to the suspended load.

[0031] During normal operation, the first brake device 30 primarily controls the rotation of the traction member 20 via its configured pawl-and-ratchet mechanism. In contrast, as shown in Figure 6, the lock latch 43 of the second brake device 40 is kept retracted within the groove 422 of the rotating disc 42 by the biasing force of the spring 44. Under these conditions, the traction member 20 rotates freely without interference from the second brake device 40, enabling smooth lifting and lowering based on operator input via the hand lever 61. This second brake device does not interfere with normal operation.

[0032] In emergencies such as a failure of the first brake device 30, a fracture of the load shaft 16, or a malfunction of a component in the transmission assembly 50, the suspended load may begin to fall due to gravity, and the rotational speed of the traction member 20 may rise uncontrollably. Under these circumstances, the centrifugal force acting on the lock latch 43 increases in proportion to the rotational speed, and once the rotational speed exceeds a predetermined safety value, it will eventually overcome the biasing force of the spring 44. As shown in Figure 7, once a predetermined speed threshold is exceeded, the increased centrifugal force causes the lock latch 43 to rotate outward from the groove 422, and the outer end 432 of the lock latch 43 engages with the fixed engagement structure 412 on the side plate 41. This engagement securely locks the rotation of the traction member 20, preventing further rotation and immediately stopping the descent of the suspended load. This mechanism, which uses centrifugal force to activate such engagement, guarantees automatic operation without requiring operator intervention, power, or an external control system, thus providing extremely high reliability even in emergencies.

[0033] The arrangement of the second brake device 40 is not limited to the embodiments described above. In another embodiment shown in Figure 8, the lifting device 1a comprises a housing 10, a traction member 20a, a first brake device 30, a second brake device 40, and a transmission assembly 50. Since the housing 10, the first brake device 30, the second brake device 40, and the transmission assembly 50 have substantially the same configuration as those shown in Figures 1-7, a detailed description of their structural features will not be repeated for brevity.

[0034] The traction member 20a differs from the traction member 20 shown in Figure 1 in the following respects: the first engaging portion 22a is positioned between the load portion 21 and the second engaging portion 23, and on one side of the housing 10, the second brake device 40 and the transmission assembly 50 engage with the first engaging portion 22a and the second engaging portion 23, respectively. With this configuration, both complex systems can be serviced from one side of the device, making maintenance easier and reducing the time required for disassembly and maintenance.

[0035] Figure 9 is a perspective view of a lifting device 1b according to several embodiments of the present disclosure. In Figure 9, components denoted by the same reference numerals as those in Figure 2 refer to the same components or equivalent components. For brevity, detailed descriptions are not repeated here. Differences between lifting device 1 and lifting device 1b include the replacement of the operating member 60 with an operating member 60b. In some embodiments, lifting device 1b is configured as a chain hoist, and the operating member 60b includes a hand chain wheel 62 and a hand chain 63.

[0036] The hand chain wheel 62 constitutes a pulley mechanism that obtains a mechanical gain (a mechanical advantage similar to the principle of leverage) via the hand chain 63, allowing the operator to lift heavy objects with less effort compared to lifting them directly by hand. When the operator pulls one end of the hand chain 63, the hand chain wheel 62 converts the input force into rotational motion, driving the load shaft 16 via an appropriate mechanical coupling mechanism. This configuration makes it possible to continuously apply lifting force while precisely controlling and positioning the load, without the reciprocating motion required by lever-type operating members.

[0037] Similarly, the lifting device 1b is equipped with a dual braking system that operates in both normal and emergency situations. During normal operation, the first braking device 30 primarily controls the load, moving the device while maintaining a controlled load according to the operator's input via the operating member 60b. On the other hand, in the event of an emergency such as a component failure, the second braking device 40 directly engages with the traction member to provide an independent fall prevention function, maintaining the same safety advantages as the previously described embodiment, regardless of the configuration of the operating member.

[0038] Figure 10 is a block diagram of a lifting device 1c according to a fourth embodiment of the present disclosure. In some embodiments, the lifting device 1c is configured as a braked manual winch for towing, lifting, and positioning a load by rotating and winding a rope or cable onto a drum or spool. Specifically, a braked manual winch combines manual operation with a braking system, enabling controlled handling of loads while enhancing safety features.

[0039] According to some embodiments, the lifting device 1c comprises a housing 10c, a traction member 20c, a first brake device 30c, a second brake device 40c, a transmission assembly 50c, and an operating member 60c.

[0040] The housing 10c includes a first housing plate 11c and a second housing plate 12c that protect the internal mechanism from environmental factors such as mechanical shocks that may impair its operational performance and lifespan. The first housing plate 11c is located near the operating section, and the second housing plate 12c is located opposite the first housing plate 11c. The traction member 20c is mounted within the housing 10c so as to be rotatable around the axis L5, and serves as a component for manipulating and controlling the load.

[0041] According to one embodiment, the traction member 20c comprises a load portion 21c and a first engagement portion 22c. The load portion 21c is in direct contact with the rope (such as a wire rope) used for lifting operations. In one example embodiment, the load portion 21c has a drum-like structure and comprises a main body 210, a first side panel 211, and a second side panel 212. The first side panel 211 and the second side panel 212 are connected to opposing ends of the main body 210 and define a rope receiving area with a raised boundary to prevent the rope from slipping during winding operations. This drum configuration provides a properly controlled winding surface that maintains the alignment of the rope and prevents entanglement and overlapping that could impair load control. The cylindrical main body 210 has a smooth or textured surface and is designed to provide appropriate grip on the rope while minimizing wear during repeated winding and unwinding operations.

[0042] The first engaging portion 22c is integrally formed with the load portion 21c and connected to the first side panel 211. A hollow passage 26c extends along the axis L5, and this passage is configured to allow components such as the load shaft 16c to pass through. The load shaft 16c passes through the hollow passage 26c along the axis L5 and extends from a first end 161c to a second end 162c. The first end 161c and the second end 162c are fixed to the first housing plate 11c and the second housing plate 12c, respectively, and the traction member 20c is rotatably supported by the load shaft 16c via a suitable bearing configuration.

[0043] The transmission assembly 50c is configured to efficiently transmit the driving force for rotating the traction member 20c. The assembly incorporates several components that work together to achieve mechanical gain and efficient force transmission, thereby enabling the operator to handle substantially heavier loads than would be possible with a direct mechanical connection. In some embodiments, the transmission assembly 50c includes a rotating shaft 17c rotatably supported by the housing 10c. This rotating shaft 17c is configured to function as an element that transmits torque from the operating member 60c to the traction member 20c via the gears of the transmission assembly 50c along the path indicated by the arrows in Figure 10. In one exemplary embodiment, the rotating shaft 17c is rotatable about a rotation axis L4. The rotating shaft 17c has a first end 171c that passes through a first housing plate 11c and connects to the operating member 60c, and a second end 172c that is rotatably connected to a second housing plate 12c.

[0044] The transmission assembly 50c may include gears 51c and 52c, which form a multi-stage gear train. This gear train increases the mechanical gain and allows the operator to lift heavier loads with less effort. In some embodiments, gear 51c is directly connected to a section of the rotating shaft 17c located between the first housing plate 11c and the second housing plate 12c. In other embodiments, a male screw formed on the outer surface of the rotating shaft 17c is used instead of gear 51c. Gear 52c is connected to the outside of the first side panel 211 of the load section 21c and meshes with gear 51c, thereby forming a power transmission path from the rotating shaft 17c to the traction member 20c. This multi-stage gear configuration allows the operator to exert lifting power with easily controllable force. Furthermore, the gear reduction function allows for precise adjustment and control of the load position during operations such as lifting and lowering.

[0045] The first brake device 30c is a Weston-type road brake and comprises a gear 31c and one or more pawls 32c. The gear 31c is fixed to the portion of the rotating shaft 17c located between the first housing plate 11c and the operating member 60c. In some embodiments shown in Figure 11, two pawls 32c are rotatably mounted on the outer surface of the first housing plate 11c, and these constitute a mechanical interface for controlling the rotation of the gear 31c. The gear 31c and pawls 32c may be housed in a gearbox 18c. The detailed configuration and operating mechanism of the first brake device 30c in this embodiment are the same as those of the first brake device 30 described in the embodiment related to Figure 3, and are therefore omitted here for brevity.

[0046] Referring again to Figure 10, in some embodiments, the second brake device 40c includes a side plate 41c and a fall prevention device 46c. The side plate 41c is fixed to the inner surface of the first housing plate 11c of the housing 10c, and the fall prevention device 46c is fixed to the first engagement portion 22c of the traction member 20c, so that the fall prevention device and the traction member rotate synchronously.

[0047] In some embodiments shown in Figure 12, the side plate 41c has a through hole 411c that is aligned with the axis L5 and through which the first engaging portion 22c of the traction member 20c can pass. Furthermore, the side plate 41c has a fixed engaging structure 412c that is circumferentially arranged along the inner edge of the through hole 411c. The fall prevention device 46c includes a rotating disk 42c, a plurality of locking latches 43c, a plurality of springs 44c, and a cover 45c. The structural features of the rotating disk 42c, locking latches 43c, springs 44c, and cover 45c are the same as those shown in Figure 4, and therefore, for brevity, their description is omitted here.

[0048] In some embodiments, as shown in Figure 12, the first engagement portion 22c is a cylindrical structure extending along axis L5 from the first side panel 211 of the load portion 21c. This cylindrical structure has a circular outer surface. To maintain synchronous rotation between the fall prevention device 46c and the traction member 20c, the rotating disk 42c is fixed to the first engagement portion 22c using an adapter 47c. The outer surface of the adapter 47c may be formed to have a non-circular contour, such as a hexagon or other polygonal shape having multiple flat surfaces or edges, while the inner surface of the rotating disk 42c is formed to have a complementary shape that conforms to the outer shape of the adapter. Such a polygonal fitting structure ensures a secure mechanical engagement so that no relative rotation occurs between the adapter 47c and the rotating disk 42c during the rotation of the traction member 20c. The hexagonal or polygonal configuration provides multiple contact surfaces that evenly distribute rotational forces, increasing the reliability of the rotational coupling under high torque conditions. The adapter 47c can be fixed to the first engaging portion 22c by appropriate means such as the lock ring 48c shown in Figure 12. However, the embodiments are not limited thereto. In other embodiments, the adapter 47c may be omitted, and the outer shape of the first engaging portion 22c may be made to have corners complementary to the inner circumference of the rotating disk 42c, thereby preventing relative rotation by direct geometric engagement.

[0049] Figure 13 is a block diagram of a lifting device 1d according to a fifth embodiment of the present disclosure. In some embodiments, the lifting device 1d is configured as an industrial winch designed for demanding applications requiring large load capacity and high durability.

[0050] According to some embodiments, the lifting device 1d comprises a housing 10d, a traction member 20d, a first brake device 30d, a second brake device 40d, a transmission assembly 50d, and an operating member 60d.

[0051] The housing 10d includes a first housing plate 11d and a second housing plate 12d that protect the internal mechanism from environmental factors such as mechanical shocks that may impair its operational performance and durability. The first housing plate 11d is located near the operating section, and the second housing plate 12d is located opposite the first housing plate 11d. Furthermore, the housing 10d includes a gearbox 18d that houses the power transmission components, thereby protecting and organizing the gear train, as well as facilitating access during maintenance and operation of the lubrication system.

[0052] According to one embodiment, the traction member 20d comprises a load portion 21d and a first engagement portion 22d. The load portion 21d is in direct contact with the rope (such as a wire rope) used for lifting operations. In one exemplary embodiment, the load portion 21d has a drum-like structure and comprises a main body 210d, a first side panel 211d, and a second side panel 212d. The first side panel 211d and the second side panel 212d are connected to both ends of the main body 210d and define a rope storage area. Raised flanges are provided in this area to securely hold the rope during winding operations. This industrial drum configuration has enhanced structural reinforcement compared to a standard winch drum and is designed to accommodate larger diameters. This enables handling of heavier rope loads and longer operating cycles. The main body 210d may have surfaces with appropriate groove patterns or textures (surface treatments) to optimally grip the rope while minimizing wear under high loads. The first engaging portion 22d is joined to the first side panel 211d of the load portion 21d, for example, by welding. The first engaging portion 22d may be configured as a solid cylindrical body that provides a robust mechanical interface to components of the brakes and transmission.

[0053] The traction member 20d is rotatably mounted within the housing 10d via two support pins 191 and 192. Support pin 191 is rotatably supported by and passes through the first housing plate 11d. The outer end of support pin 191 is located within the gearbox 18d, and the inner end of support pin 191 is connected to the first engagement portion 22d of the traction member 20d. Support pin 191 may be formed integrally with the first engagement portion 22d. Support pin 192 is rotatably supported by the second housing plate 12d and is connected to the second side panel 212d. This configuration ensures that the traction member 20d is rotatable around the axis L7 and functions as a component for manipulating and controlling the load, while also providing robust support capable of withstanding harsh operating conditions.

[0054] The transmission assembly 50d is configured to efficiently transmit the driving force for rotating the traction member 20d. The assembly incorporates several components that work together to achieve mechanical gain and efficient force transmission, thereby enabling the operator to handle substantially heavier loads than would be possible with a direct mechanical connection. In some embodiments, the transmission assembly 50d includes a rotating shaft 17d rotatably supported by a housing 10d, which is configured to function as an element that transmits torque from the operating member 60d to the traction member 20d via the gears of the transmission assembly 50d along the path indicated by the arrows in Figure 13. In one embodiment, the rotating shaft 17d is rotatable about a rotation axis L6. The rotating shaft 17d has a first end that passes through a gearbox 18d and is connected to the operating member 60d, and a second end that is rotatably connected to a first housing plate 11d.

[0055] The transmission assembly 50d may include gears 51d, 52d, and 53d, which form a multi-stage gear train to increase mechanical gain, allowing the operator to lift heavier loads with less effort. In some embodiments, gear 51d is directly connected to a section of the rotating shaft 17d located within the gearbox 18d. Gear 53d is directly connected to a support pin 191. Gear 52d meshes with gears 51d and 53d, forming a power transmission path from the rotating shaft 17d to the traction member 20d. Such a multi-stage gear configuration allows the operator to operate with a manageable amount of force while ensuring the ability to lift heavy loads. These gears also provide a reduction function, enabling precise positioning and control of the load during lifting operations.

[0056] The first brake device 30d is a Weston-type road brake and comprises a gear 31d and one or more pawls 32d. The gear 31d is fixed to a portion of a rotating shaft 17d extending from a gearbox 18d. In some embodiments shown in Figure 14, one pawl 32d is rotatably mounted on the outer surface of the gearbox 18d and constitutes a mechanical interface for controlling the rotation of the gear 31d. The detailed configuration and operating mechanism of the first brake device 30d in this embodiment are the same as those of the first brake device 30 described in the embodiment related to Figure 3, and are therefore omitted here for brevity.

[0057] Referring again to Figure 13, in some embodiments, the second brake device 40d includes a side plate 41d and a fall prevention device 46d. The side plate 41d is fixed to the inner surface of the first housing plate 11d of the housing 10d, and the fall prevention device 46d is fixed to the first engagement portion 22d of the traction member 20d, so that the fall prevention device and the traction member rotate synchronously.

[0058] In some embodiments shown in Figure 15, the side plate 41d is provided with a through hole 411d aligned with axis L7, which allows the first engaging portion 22d of the traction member 20d to pass through. The side plate 41d further includes a fixed engaging structure 412d circumferentially arranged along the inner edge of the through hole 411d. The engaging structure 412d may include a plurality of teeth or notches. The fall prevention device 46d comprises a rotating disk 42d, a plurality of locking latches 43d, a plurality of springs 44d, and a cover 45d. The structural features of the rotating disk 42d, locking latches 43d, springs 44d, and cover 45d are similar to those shown in Figure 4, and are therefore omitted here for brevity.

[0059] In some embodiments, as shown in Figure 15, the first engagement portion 22d extends along axis L7 from the first side panel 211d of the load portion 21d and has a circular outer surface. To maintain synchronous rotation between the fall prevention device 46d and the traction member 20d, the rotating disk 42d is fixed to the first engagement portion 22d using an adapter 47d. The outer circumferential surface of the adapter 47d may be formed in a non-circular contour, such as a hexagon or other polygonal shape having multiple flat surfaces or edges, while the inner circumferential surface of the rotating disk 42d is formed in a complementary shape that conforms to the outer shape of the adapter. Such a polygonal fitting structure ensures a secure mechanical engagement that prevents relative rotation between the adapter 47d and the rotating disk 42d during rotation of the traction member 20d. The hexagonal or polygonal configuration provides multiple contact surfaces that evenly distribute rotational forces and increase the reliability of the rotational coupling under high torque conditions. The adapter 47d can be fixed to the first engaging portion 22d by appropriate means such as the lock ring 48d shown in Figure 15. However, the embodiments are not limited thereto. In other embodiments, the adapter 47d may be omitted, and the outer shape of the first engaging portion 22d may be made to have corners complementary to the inner circumference of the rotating disk 42d, thereby preventing relative rotation by direct geometric engagement.

[0060] The lifting device described in the embodiments of this disclosure achieves a significant improvement over conventional lifting device designs by incorporating a second braking device that operates independently of the first braking device and transmission components. This second braking device, directly attached to the traction member, eliminates vulnerabilities in conventional lifting device designs by ensuring reliable load control even in the event of a critical component failure. This represents a significant advance in lifting technology, improving operator safety and reliability in various industrial applications.

[0061] The above description outlines the configurations of several embodiments so that those skilled in the art may better understand the aspects of this disclosure. Those skilled in the art will understand that this disclosure can be readily used when designing or modifying other processes or structures to achieve similar objectives or obtain similar advantages as the embodiments described herein. Furthermore, those skilled in the art will recognize that such equivalent configurations do not deviate from the spirit and scope of this disclosure, and that various changes, substitutions, and modifications can be made herein without departing from the spirit and scope of this disclosure.

Claims

1. Housing and A traction member that is rotatable about an axis and disposed in the housing, the traction member includes a load portion and a first engagement portion, A transmission assembly configured to transmit a driving force for rotating the traction member, A first brake device connected to the transmission assembly and configured to restrict the rotational movement of the traction member in a predetermined direction, A second braking device is provided, The second brake device is A side plate connected to the housing and having a fixed engagement structure arranged around the axis, A rotating disk connected to the first engaging portion of the traction member, The rotating disk comprises a plurality of locking latches arranged on the rotating disk and configured to engage with the fixed engagement structure, Lifting device.

2. The rotating disk has a plurality of grooves formed therein for receiving the lock latch. The second brake device further comprises a plurality of springs, each connected to the corresponding lock latch and the rotating disc, The lifting device according to claim 1, wherein the spring is configured such that when the rotational speed of the traction member exceeds a predetermined value, the lock latch protrudes from the groove due to centrifugal force and engages with the fixed engagement structure.

3. The lifting device according to claim 1, wherein the rotating disk and the plurality of lock latches disposed thereon are spaced radially inward from the fixed engagement structure, so that during normal operation, no direct contact occurs between the lock latches and the fixed engagement structure until the rotational speed of the traction member exceeds a predetermined value and the lock latches extend outward due to centrifugal force and engage with the fixed engagement structure.

4. The lifting device according to claim 1, further comprising a chain or rope connected to the load-bearing section.

5. The traction member has a hollow passage extending along the axis and is equipped with a second engagement portion. The aforementioned transmission assembly is A load shaft extending along the axis from the first end to the second end through the hollow passage, A lifting device according to any one of claims 1 to 4, comprising a plurality of gears connected to the second end of the load shaft and the second engaging portion of the traction member.

6. The lifting device according to claim 5, wherein the first engaging portion and the second engaging portion are connected to both ends of the load portion, and the second brake device and the gear are engaged with the first engaging portion and the second engaging portion, respectively, at positions opposite each other to the housing.

7. The first brake device is A gear fixed to the portion of the load shaft between the traction member and the first end, At least one claw disposed on the side plate or the housing, The lifting device according to claim 5, further comprising: at least one elastic member connected to the claw and configured to maintain the claw in contact with the gear.

8. The lifting device according to any one of claims 1 to 4, wherein the load portion and the first engagement portion are integrally formed, and the rotating disc of the second brake device is directly fixed to the first engagement portion.

9. The load shaft further comprises extending along the aforementioned axis and fixed to the housing, The traction member is rotatably supported by the load shaft, The aforementioned transmission assembly is A rotating shaft rotatably supported by the housing, wherein the first brake device is connected to the rotating shaft, A gear fixed to the traction member and connected to the rotating shaft, A lifting device according to any one of claims 1 to 4.

10. The system further comprises two support pins connected to the traction member along the aforementioned axis and rotatably connected to the housing, The aforementioned transmission assembly is A rotating shaft rotatably supported by the housing, A lifting device according to any one of claims 1 to 4, comprising a gear fixed to one of the support pins and connected to the rotating shaft.

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