Lifting device

Abstract

Embodiments of the present application provide a lifting device, which includes: a housing; a traction component rotatable about an axis and disposed on the housing, the traction component including a load portion and a first engagement portion; a drive assembly configured to transmit a driving force to rotate the traction component; a first brake element connected to the drive assembly and configured to limit the rotational movement of the traction component in a predetermined direction; and a second brake element. The second brake element includes: a side plate connected to the housing and having a fixed engagement structure configured about the axis; a rotating disc connected to the first engagement portion of the traction component; and a plurality of locking latches positioned on the rotating disc and configured to engage the fixed engagement structure.

Description

Technical Field

[0001] This utility model relates to a lifting device, and more particularly to a lifting device having multiple braking elements. Background Technology

[0002] Lifting devices such as lever hoists, chain blocks, and winches are widely used in various industries for material handling, construction, maintenance, and safety applications. These devices utilize a load chain or rope to support the load and are designed to lift, lower, and pull the load via manual operation, compressed air power, or electric motor power. Lever hoists, in particular, are often used in elevated production line construction, personnel safety applications, and situations involving changing the direction of the load due to their compact, lightweight design and reliable mechanical operation.

[0003] Traditional lever cranes incorporate basic components including: a protective housing, an ergonomically designed handle, a steel chain for attachment to the suspended load, a safety hook for connection points, and a braking mechanism designed to control load movement during operation. The operating principle involves an operator applying a controlled force to the handle, which transmits power through a precision gear train and transmission assembly to raise or lower the load attached to the load chain. However, safety considerations are paramount in lever crane operation because mechanical failure and / or brake failure can cause the load to fall uncontrollably, posing a significant risk to personnel safety and potentially resulting in property damage.

[0004] Therefore, there is a need for an improved lifting device design that provides effective anti-fall capability even in the event of the aforementioned mechanical failures. Utility Model Content

[0005] In some embodiments of this invention, a lifting device embodies an improvement in the safety and reliability of lifting operations in various industrial applications. This lifting device is suitable for applications spanning construction, manufacturing, logistics, maintenance, and public utility operations, where personnel safety and load control are primary considerations.

[0006] According to one embodiment of the present invention, a lifting device is provided. The lifting device includes: a housing; a traction member rotatable about an axis and disposed on the housing, the traction member including a load portion and a first engagement portion; a transmission assembly configured to transmit a driving force to rotate the traction member; a first braking element connected to the transmission assembly and configured to limit the rotational movement of the traction member in a predetermined direction; and a second braking element. The second braking element includes: a side plate connected to the housing and having a fixed engagement structure arranged about an axis; a rotating disk connected to the first engagement portion of the traction member; and a plurality of locking latches positioned on the rotating disk and configured to engage the fixed engagement structure. Attached Figure Description

[0007] The various embodiments of this utility model can be best understood from the following detailed description when read in conjunction with the accompanying drawings. It should be noted that, according to standard industrial practice, the various structures are not drawn to scale. In fact, for clarity of explanation, the dimensions of the various structures may be arbitrarily increased or decreased.

[0008] Figure 1 This is a block diagram of a lifting device according to a first embodiment of the present invention.

[0009] Figure 2 This is a perspective view of an exemplary lifting device according to the first embodiment.

[0010] Figure 3 yes Figure 2 A partial perspective view of an exemplary lifting device shown in the figure.

[0011] Figure 4 yes Figure 2 An exploded view of some components of the exemplary lifting device shown in the figure.

[0012] Figure 5 yes Figure 2 A partial perspective view of an exemplary lifting device shown in the figure.

[0013] Figure 6 yes Figure 2 The exemplary lifting device shown is a side view of a second braking element in normal operation.

[0014] Figure 7 yes Figure 2 The exemplary lifting device shown is a side view of the second braking element operating in an abnormal state due to exceeding the rotational speed.

[0015] Figure 8 This is a block diagram of a lifting device according to a second embodiment of the present invention.

[0016] Figure 9 This is a perspective view of a lifting device according to a third embodiment of the present invention.

[0017] Figure 10 This is a block diagram of a lifting device according to a fourth embodiment of the present invention.

[0018] Figure 11 This is an exploded view of an exemplary lifting device according to the fourth embodiment.

[0019] Figure 12 yes Figure 11 An exploded view of some components of the exemplary lifting device shown in the figure.

[0020] Figure 13 This is a block diagram of a lifting device according to a fifth embodiment of the present invention.

[0021] Figure 14 This is an exploded view of an exemplary lifting device according to the fifth embodiment.

[0022] Figure 15 yes Figure 14 An exploded view of some components of the exemplary lifting device shown in the figure. Detailed Implementation

[0023] The following utility model description provides numerous different embodiments or examples of various components for implementing the provided subject matter. Specific examples of elements and configurations are described below to simplify the present utility model. Of course, these are merely examples and are not intended to be limiting. For example, in the following description, the formation of a first component on or on a second component may include embodiments in which the first and second components are formed in direct contact, and may also include embodiments in which additional components may be formed between the first and second components such that the first and second components are not in direct contact. Furthermore, the present utility model may repeat element symbols and / or letters in various examples. This repetition is for simplicity and clarity and does not substantially specify a relationship between the various embodiments and / or configurations discussed.

[0024] Furthermore, for ease of explanation, spatial relative terms (such as "below," "under," "lower part," "above," "above," "upper part," "above," and the like) may be used herein to describe the relationship of one element or component to another element or component(s), as illustrated in the figures. In addition to the orientations illustrated in the figures, these spatial relative terms are also intended to cover different orientations of the device during use or operation. The device may be oriented in other ways (rotated 90 degrees or otherwise) and the spatial relative descriptions used herein can therefore be understood in the same way.

[0025] As used herein, terms such as "first," "second," and "third" describe various elements, components, regions, layers, and / or sections, which should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, the use of terms such as "first," "second," and "third" herein does not imply a sequence or order.

[0026] As used herein, the terms "approximately," "substantially," "substantially," and "about" are used to describe and take into account minor variations. When used in conjunction with an event or situation, these terms may refer to instances in which the event or situation occurs precisely or instances in which the event or situation occurs approximately.

[0027] According to one embodiment of the present invention, a lever-type crane includes a dual braking system for enhanced safety, comprising a primary brake and an auxiliary brake. The primary brake is mounted on a drive shaft and employs a pawl to stop the shaft when the operator stops applying torque via a handle. The auxiliary brake is coaxially mounted on the same drive shaft. When the primary brake fails, the auxiliary brake prevents further rotation of the drive shaft and indirectly prevents further rotation of the sprocket.

[0028] However, because the auxiliary brake is directly connected to the drive shaft, the system's safety redundancy is compromised when multiple components fail simultaneously. Specifically, if the main brake fails to engage properly due to mechanical failure, corrosion, or ice formation, and simultaneously the drive shaft breaks or a transmission component experiences mechanical failure, the rotation of the load sprocket cannot be stopped by the auxiliary brake. This failure scenario creates a safety hazard, as the suspended load could fall rapidly and uncontrollably, potentially leading to catastrophic accidents, property damage, and serious personal injury.

[0029] To address the problems of the above embodiments, some embodiments of the present invention provide an improved lifting device design, which includes an independent safety mechanism that operates independently of the drive shaft or transmission system, thereby ensuring that the anti-fall capability is maintained even in the event of a serious component failure.

[0030] refer to Figure 1 In one exemplary embodiment, the lifting device 1 includes a robust housing 10 that provides comprehensive structural support and environmental protection for the internal operating components. The housing 10 includes a first housing plate 11 and a second housing plate 12, which shield the internal mechanisms from environmental factors, including mechanical impacts, that could impair operational performance and lifespan. The first housing plate 11 is positioned adjacent to the operating controls, and the second housing plate 12 accommodates the transmission components.

[0031] according to Figure 2 In one embodiment shown, the lifting device 1 may further include several additional structural components, such as a fixing hook 13, a load hook 14, and a chain 15, to contribute to overall operational efficiency and safety. The fixing hook 13 is securely attached to the housing 10, thereby providing a connection point for fastening the device to a fixed support structure or other mounting point, such as an aerial beam, a crane system, or other mounting point. This connection enables stable operation by providing a robust anchor point that can withstand operating forces and load requirements.

[0032] Chain 15 is typically constructed of high-strength steel, which passes through the load portion 21 of traction component 20, thus providing a mechanical connection between the device and the suspended load. Load hook 14 is attached to chain 15, providing a connection for attachment to a raised or lowered load. Load hook 14 is designed to accommodate various load attachment configurations while maintaining a secure connection throughout the operating cycle.

[0033] refer to Figure 1 The lifting device 1 also includes a traction component 20 (also called a load sprocket), which is rotatably mounted within the housing 10 about an axis L1, serving as a component for load manipulation and control. The traction component 20 is directly connected to a chain or similar for lifting and lowering operations. Figure 4 In one embodiment shown, the traction component 20 includes several different functional parts that contribute to its operational efficiency, such as a load portion 21, a first engagement portion 22, a second engagement portion 23, a first extension portion 24, and a second extension portion 25.

[0034] The load portion 21 is configured for connecting a chain or rope (such as a wire rope), characterized by a surface structure that allows the traction member 20 to wind or unwind the chain or rope by rotational movement, thereby achieving precise lifting or lowering of the load attached to the load hook. This connection interface is designed to minimize chain wear during operation while maximizing grip and control. The first engagement portion 22 and the second engagement portion 23 respectively provide interfaces for braking and transmission mechanisms, allowing mechanical forces to be properly distributed and controlled throughout the operating cycle. These engagement portions are machined to maintain reliable mechanical connections with associated components. The first extension portion 24 and the second extension portion 25 are positioned between the load portion 21 and their respective engagement portions, thereby providing structural spacing and alignment within the housing plate while contributing to overall mechanical stability. These extensions also serve to distribute mechanical stress throughout the traction member structure, thereby enhancing durability under heavy load conditions. The load portion 21, the first engagement portion 22, the second engagement portion 23, the first extension portion 24, and the second extension portion 25 are integrally formed by a suitable manufacturing process such as forging.

[0035] Refer again Figure 1The traction component 20 has a hollow channel 26 extending along axis L1. The hollow channel 26 is configured to allow an assembly such as a load shaft 16 to pass through. The load shaft 16 extends along axis L1 through the hollow channel 26 from a first end 161 to a second end 162. The load shaft 16 serves to transfer torque from the operating component 60 along... Figure 1 The arrow in the diagram indicates a path that transmits to the element of the traction component 20.

[0036] The lifting device 1 further includes a transmission assembly 50 configured to efficiently transmit driving force to rotate the traction member 20. This transmission assembly 50 combines multiple cooperating components to provide mechanical advantages and efficient force transmission, enabling the operator to manipulate loads substantially heavier than those that could be manipulated via direct mechanical connection. In an exemplary embodiment, the assembly includes gears 51, 52, 53, and 54 forming a multi-stage gear train that amplifies mechanical advantages while allowing the operator to lift heavier loads with less physical effort.

[0037] Gear 51 is directly connected to the second end 162 of the load shaft 16, thus serving as the input gear of the transmission system. This gear meshes with gear 52, which, together with gear 53, is mounted on the rotating shaft L2 or L3. The combination of gears 52 and 53 provides intermediate mechanical advantages within the transmission system. Gear 53 then meshes with gear 54, which is connected to the second engagement portion 23 of the traction member 20, thereby forming a power transmission path from the load shaft to the traction member. This multi-stage gear configuration allows the operator to apply controlled force while achieving heavy-load lifting. These gears also provide speed reduction, thereby enabling precise load positioning and control during lifting and lowering operations.

[0038] Furthermore, the lifting device 1 includes a first braking element 30 serving as a load control mechanism. In some embodiments, the first braking element 30 controls the rotation of the traction member 20 during normal operation, thereby ensuring that the suspended load does not unexpectedly drop. Figure 3 In one exemplary embodiment shown, the first braking element 30 is a Weston-style load brake and includes a gear disc 31, one or more pawls 32 and one or more resilient members 33.

[0039] The gear wheel 31 is fixed to the load shaft 16 at a location between the traction member 20 and the first end 161. One or more pawls 32 are configured to provide a mechanical connection for controlling the rotation of the gear wheel 31. These pawls engage with the gear wheel teeth via a pawl-ratchet mechanism that allows rotation in the lifting direction while preventing rotation in the lowering direction unless explicitly actuated by the operator. A resilient element 33, such as a precision spring, biases the pawls 32 to engage with the gear wheel 31 for automatic engagement when the operator does not actively control the system. This mechanism enables controlled movement of the suspended load while preventing potential safety hazards due to accidental descent. The pawls 32 and the resilient element 33 may be mounted to a fixed component of the lifting device 1, such as the first housing plate 11 or a side plate 41 of a second braking element 40 further described herein.

[0040] like Figure 1 As shown, to provide enhanced safety beyond that offered by the first braking element 30, the lifting device 1 also includes a second braking element 40. The second braking element 40 operates directly on the traction member 20, thereby providing effective anti-fall capability in the event of failure or malfunction of the first braking element 30 or the transmission assembly. In some embodiments, the second braking element 40 includes a side plate 41 and an anti-fall element 46. The side plate 41 is securely fixed to the first housing plate 11 of the housing 10, and the anti-fall element 46 is directly fixed to the first engagement portion 22 of the traction member 20, thereby allowing the anti-fall element to rotate synchronously with the traction member.

[0041] according to Figure 4 In some embodiments shown, the side plate 41 includes a through hole 411 aligned with axis L1, allowing the first engagement portion 22 of the traction member 20 to pass through. The side plate 41 further includes a fixed engagement structure 412 arranged circumferentially along the inner edge of the through hole 411. The engagement structure 412 may include a plurality of teeth or notches.

[0042] The anti-fall element 46 includes a rotating disk 42, a plurality of locking latches 43, a plurality of springs 44, and a cover 45. The rotating disk 42 is directly fixed to the first engagement portion 22 of the traction component 20. The outer surface of the first engagement portion 22 may be shaped to have a non-circular profile, such as a hexagonal structure or other angled geometry with multiple flat surfaces or edges, while the inner periphery of the rotating disk 42 is correspondingly shaped to have a complementary profile that matches the outer profile of the adapter. The rotating disk 42 has an upper surface 421 on which a plurality of grooves 422 are formed. Each of the grooves 422 is provided with a locking latch 43 serving as an engagement element for an auxiliary braking system. The locking latches 43 are configured to pivot outward under centrifugal force when the rotational speed exceeds a predetermined safety threshold, thereby automatically activating without operator intervention or an external control system.

[0043] Each latch 43 has an inner end 431 including a bottom protrusion 434 and a top protrusion 433, which pivotally engage with a first positioning hole 423 on the rotary disk 42 and a second positioning hole 451 on the cover 45, respectively. This dual-pivot configuration provides stable mechanical support while allowing the latches to pivot smoothly under centrifugal force. The outer end 432 of each latch 43 is connected to a spring 44. The spring 44 is connected to the outer end 432 of the latch 43 to provide a controlled biasing force to hold the latch 43 in the retracted position during normal operation. This spring load prevents the latch from engaging with the fixed engagement structure 412 under normal operating conditions, while allowing the latch to automatically deploy in an emergency. In addition, the spring load of the spring 44 is selected to ensure proper release upon reaching a threshold speed, while preventing premature engagement during changes in normal operation. The cover 45 is positioned above the upper surface 421 of the rotary disk 42 to provide environmental protection for the latches 43 and the spring 44 while maintaining structural support for the mechanism. The cover 45 is designed to be attached to the rotating disk 42 by fasteners (such as screws).

[0044] In some embodiments, the lifting device 1 also includes an operating component 60. The operating component 60 may include... Figure 2 A handle 61 is shown in the diagram. Handle 61 provides the primary human-machine interface for controlling the operation of the lifting device. Handle 61 is designed to minimize operator fatigue during extended operation while providing sufficient leverage for effective load control. In some embodiments, the operating component 60 is connected to the gear wheel 31 via a known mechanism. During operation, the operator moves handle 61 in a reciprocating motion, and the load force from handle 61 is transmitted via the gear wheel 31 to the load shaft 16, causing the load shaft 16 to rotate at an increased speed. This rotation is then transmitted via the drive assembly 50 to the traction component 20, thereby enabling controlled winding or unwinding of the chain 15 or wire rope connected to the suspended load.

[0045] During normal operation, the first braking element 30 provides primary control over the rotation of the traction component 20 via the established pawl and ratchet mechanism. In contrast, as... Figure 6 As shown, due to the biasing force provided by the spring 44, the locking latch 43 of the second braking element 40 remains retracted within the groove 422 of the rotating disk 42. Under these conditions, the traction member 20 rotates freely without interference from the second braking element 40, allowing the operator to smoothly perform lifting and lowering operations via input of the handle 61. That is, the second braking element does not interfere with normal operation.

[0046] In emergency situations (such as failure of the first braking element 30, breakage of the load shaft 16, or failure of the transmission assembly 50), as the suspended load begins to fall under gravity, the rotational speed of the traction component 20 will increase uncontrollably. In these cases, the centrifugal force acting on the locking latch 43 increases proportionally to the rotational speed, eventually overcoming the biasing force of the spring 44 when the rotational speed exceeds a predetermined safety value. Figure 7 As illustrated, when a predetermined speed threshold is exceeded, the locking latch 43 pivots outward from the groove 422 due to the increased centrifugal force, causing the outer end 432 of the locking latch 43 to engage with the fixed engagement structure 412 on the side plate 41. This engagement effectively locks the rotation of the traction component 20, thereby preventing further rotation and immediately stopping the descent of the suspended load. Utilizing centrifugal force to trigger this engagement ensures automatic operation without the need for operator, electrical, or external control system intervention, maintaining high reliability of the device even in emergency situations.

[0047] The position of the second braking element 40 should not be limited to the embodiment presented above. Figure 8 In some other alternative embodiments shown, a lifting device 1a includes a housing 10, a traction component 20a, a first braking element 30, a second braking element 40, and a transmission assembly 50. The housing 10, the first braking element 30, the second braking element 40, and the transmission assembly 50 have... Figures 1 to 7 The components presented here have essentially similar structures, and for the sake of simplicity, their detailed structural features will not be described in detail here.

[0048] Traction component 20a and Figure 1 The difference in the traction component 20 shown is that the first engagement portion 22a is positioned between the load portion 21 and the second engagement portion 23, and on one side of the housing 10, the second braking element 40 and the transmission assembly 50 engage with the first engagement portion 22a and the second engagement portion 23, respectively. Since both complex systems can be maintained from one side of the device, this configuration enables a simpler maintenance approach, thereby reducing disassembly requirements and maintenance time.

[0049] Figure 9 A perspective view of a lifting device 1b according to a partial embodiment of the present invention is shown. Figure 9 Used with Figure 2 Components with the same component symbol refer to the same component or its equivalent. For simplicity, detailed descriptions will not be repeated here. The difference between lifting device 1 and lifting device 1b includes that operating component 60 is replaced by operating component 60b. In some embodiments, lifting device 1b is configured as a chain crane, and operating component 60b includes a manual sprocket 62 and a manual chain 63.

[0050] The manual sprocket 62 includes a pulley system that provides mechanical advantages via the manual chain 63, allowing the operator to lift heavy loads with less physical effort compared to direct manual lifting. When an operator pulls one side of the manual chain 63, the manual sprocket 62 converts this input force into rotational motion, which drives the load shaft 16 via appropriate mechanical linkages. This configuration enables precise load control and positioning while maintaining the operator's ability to apply continuous lifting force without the reciprocating motion required by lever-operated components.

[0051] The lifting device 1b similarly includes dual braking elements that operate under normal and emergency conditions, respectively. During normal operation, the first braking element 30 provides primary load control, thereby ensuring that the controlled load is guided by input from the operator via the operating component 60b. In an emergency situation involving component failure, the second braking element 40 independently provides anti-fall functionality by directly engaging with the traction component, maintaining the same safety advantages described in the foregoing embodiments regardless of changes in the configuration of the operating components.

[0052] Figure 10 This is a block diagram of a lifting device 1c according to a fourth embodiment of the present invention. In some embodiments, the lifting device 1c is configured as a brake hand winch for pulling, lifting, and positioning a load by rotating a rope or cable onto a drum or spool. The brake hand winch is designed to combine manual operation with a braking system, enabling precise control of the load with enhanced safety.

[0053] According to some embodiments, the lifting device 1c includes a housing 10c, a traction component 20c, a first braking element 30c, a second braking element 40c, a transmission assembly 50c, and an operating component 60c.

[0054] The housing 10c includes a first housing plate 11c and a second housing plate 12c, which shield the internal mechanisms from environmental factors, including mechanical impacts, that may impair operational performance and lifespan. The first housing plate 11c is positioned adjacent to the operating controls, and the second housing plate 12c is positioned opposite the first housing plate 11c. A traction component 20c is rotatably mounted within the housing 10c about an axis L5 to serve as a component for load manipulation and control.

[0055] According to one embodiment, the traction component 20c includes a load portion 21c and a first engagement portion 22c. The load portion 21c is directly connected to a rope (such as a wire rope) or the like for lifting and lowering operations. In an exemplary embodiment, the load portion 21c has a drum-shaped structure and includes a body 210, a first transverse panel 211, and a second transverse panel 212. The first transverse panel 211 and the second transverse panel 212 are connected to opposite ends of the body 210 to define a rope-gathering area with raised boundaries that prevent rope displacement during winding operations. This drum structure provides a controllable winding surface that maintains the rope's structure and prevents tangling or overlapping, avoiding interference with load control. The cylindrical body 210 features a smooth or textured surface designed to provide sufficient grip on the rope while minimizing wear during repeated winding and unwinding cycles.

[0056] The first engaging portion 22c is integrally formed with the load portion 21c and connected to the first transverse panel 211. A hollow channel 26c extends along axis L5 and is configured to allow components such as the load shaft 16c to pass through. The load shaft 16c extends along axis L5 through the hollow channel 26c from a first end 161c to a second end 162c. The first end 161c and the second end 162c are respectively fixed to the first housing plate 11c and the second housing plate 12c, and the traction member 20c is rotatably supported by the load shaft 16c via a suitable bearing arrangement.

[0057] The drive assembly 50c is configured to efficiently transmit driving force to rotate the traction component 20c. This traction component incorporates multiple cooperating components to provide mechanical advantages and efficient force transmission, enabling the operator to manipulate loads substantially heavier than those manipulated via direct mechanical connection. In some embodiments, the drive assembly 50c includes a rotating shaft 17c, rotatably supported by the housing 10c and configured to transmit torque from the operating component 60c via gears in the drive assembly 50c. Figure 10The arrow in the diagram indicates a path that transmits to the element of the traction member 20c. In an exemplary embodiment, the rotating shaft 17c is rotatable about a rotation axis L4. The rotating shaft 17c has a first end 171c that penetrates the first housing plate 11c and is connected to the operating member 60c, and a second end 172c that is rotatably connected to the second housing plate 12c.

[0058] The transmission assembly 50c may also include gears 51c and 52c, which form a multi-stage gear system that amplifies mechanical advantages while allowing the operator to lift heavier loads with less physical effort. In some embodiments, gear 51c is directly connected to a segment of the rotating shaft 17c located between the first housing plate 11c and the second housing plate 12c. In some other embodiments, gear 51c is replaced by an external thread formed on the outer surface of the rotating shaft 17c. Gear 52c is connected to and meshes with gear 51c on the outer side of the first transverse panel 211 of the load portion 21c, 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 apply controlled force while achieving heavy-load lifting. These gears also provide speed reduction, thereby enabling precise load positioning and control during lifting and lowering operations.

[0059] The first braking element 30c is a Weston-type load brake and includes a gear disc 31c and one or more pawls 32c. The gear disc 31c is fixed to a segment of the rotating shaft 17c located between the first housing plate 11c and the operating member 60c. Figure 11 In some embodiments shown, two pawls 32c are rotatably connected to an outer surface of the first housing plate 11c to provide a mechanical interface for controlling the rotation of the gear disc 31c. The gear disc 31c and pawls 32c can be mounted in a gearbox 18c. The detailed structure and operating mechanism of the first braking element 30c in this embodiment are similar to those shown. Figure 3 The first braking element 30 described in the relevant embodiments will not be repeated here for the sake of simplicity.

[0060] Refer again Figure 10 In some embodiments, the second braking element 40c includes a side plate 41c and an anti-fall element 46c. The side plate 41c is securely fixed to an inner surface of the first housing plate 11c of the housing 10c, and the anti-fall element 46c is fixed to the first engagement portion 22c of the traction member 20c, thereby causing the anti-fall element to rotate synchronously with the traction member.

[0061] according to Figure 12In some embodiments shown, the side plate 41c includes a through hole 411c aligned with axis L5, allowing the first engagement portion 22c of the traction member 20c to pass through. The side plate 41c further includes a fixed engagement structure 412c arranged circumferentially along the inner edge of the through hole 411c. The anti-fall element 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 similar to... Figure 4 The structure presented in the text will not be elaborated upon here for the sake of simplicity.

[0062] In some embodiments, such as Figure 12 As shown, the first engagement portion 22c is a tubular structure extending along axis L5 from the first transverse panel 211 of the load portion 21c. This tubular structure has a circular outer surface. To maintain synchronized rotation between the anti-fall element 46c and the traction component 20c, an adapter 47c is used to secure the rotating disk 42c to the first engagement portion 22c. The outer surface of the adapter 47c may be shaped to have a non-circular profile, such as a hexagonal structure or other angled geometry with multiple flat surfaces or edges, while the inner periphery of the rotating disk 42c is correspondingly shaped to have a complementary profile that matches the outer profile of the adapter. This angled connection structure ensures a fully mechanical engagement to prevent any relative rotation between the adapter 47c and the rotating disk 42c when the traction component 20c rotates. The hexagonal or multifaceted structure provides multiple contact surfaces that distribute rotational forces evenly and enhance the reliability of the rotational coupling under high torque conditions. The adapter 47c can be secured by suitable components (such as...) Figure 12 A locking ring 48c shown is fixed to the first engagement portion 22c. However, the embodiments are not limited thereto. In some other embodiments, the adapter 47c is omitted, and the outer contour of the first engagement portion 22c is directly shaped to have an angled feature complementary to the inner periphery of the rotating disk 42c to prevent relative rotation by direct geometric engagement.

[0063] Figure 13 This is a block diagram of a lifting device 1d according to a fifth embodiment of the present invention. In some embodiments, the lifting device 1d is configured as an industrial winch designed for harsh applications requiring substantial load capacity and enhanced durability.

[0064] According to some embodiments, the lifting device 1d includes a housing 10d, a traction component 20d, a first braking element 30d, a second braking element 40d, a transmission assembly 50d, and an operating component 60d.

[0065] The housing 10d includes a first housing plate 11d and a second housing plate 12d, which shield the internal mechanisms from environmental factors, including mechanical impacts, that could impair operational performance and lifespan. The first housing plate 11d is positioned adjacent to the operating controls, and the second housing plate 12d is positioned opposite the first housing plate 11d. The housing 10d further includes a gearbox 18d, which houses the transmission components, provides additional protection for the gear set, and facilitates maintenance access and lubrication system configuration.

[0066] According to one embodiment, the traction component 20d includes a load portion 21d and a first engagement portion 22d. The load portion 21d is directly connected to a rope (such as a wire rope) or the like for lifting and lowering operations. In an exemplary embodiment, the load portion 21d has a drum-shaped structure and includes a body 210d, a first transverse panel 211d, and a second transverse panel 212d. The first transverse panel 211d and the second transverse panel 212d are connected to opposite ends of the body 210d to define a rope gathering area with raised flanges that provide safe rope containment during winding operations. Compared to standard winch drums, this industrial-grade drum structure is characterized by reinforced construction and a larger diameter capacity, thereby enabling it to accommodate heavier rope loads and extended operating cycles. The body 210d may include surfaces with appropriate groove patterns or textures to ensure optimal rope grip while minimizing wear characteristics during high-load operations. The first engagement portion 22d is connected to the first transverse panel 211d of the load portion 21d via, for example, welding. The first engagement portion 22d can be configured as a solid cylinder to provide a robust mechanical interface for braking and transmission components.

[0067] The traction component 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 a first housing plate 11d. One outer end of support pin 191 is located within the gearbox 18d, and one inner end of support pin 191 is connected to a first engagement portion 22d of the traction component 20d. Support pin 191 may be integrally formed with the first engagement portion 22d. Support pin 192 is rotatably supported by a second housing plate 12d and connected to a second transverse panel 212d. This configuration ensures that the traction component 20d can rotate about an axis L7 and serves as a component for load manipulation and control, while providing robust support for heavy-duty operation requirements.

[0068] The drive assembly 50d is configured to efficiently transmit driving force to rotate the traction component 20d. The traction component combines multiple cooperating components to provide mechanical advantages and efficient force transmission, enabling the operator to manipulate loads substantially heavier than those that could be manipulated via direct mechanical connection. In some embodiments, the drive assembly 50d includes a rotating shaft 17d, rotatably supported by the housing 10d and configured to transmit torque from the operating component 60d along the drive assembly 50d via gears. Figure 13 The arrow in the diagram indicates a path that transmits to the element of the traction component 20d. In an exemplary embodiment, the rotating shaft 17d is rotatable about a rotating axis L6. The rotating shaft 17d has a first end that penetrates the gearbox 18d and is connected to the operating component 60d, and a second end that is rotatably connected to the first housing plate 11d.

[0069] The transmission assembly 50d may also include gears 51d, 52d, and 53d, which form a multi-stage gear system that amplifies mechanical advantages while allowing the operator to lift heavier loads with less physical effort. In some embodiments, gear 51d is directly connected to a segment of the rotating shaft 17d located within the gearbox 18d. Gear 53d is directly connected to the support pin 191. Gear 52d meshes with gears 51d and 53d, thereby forming a power transmission path from the rotating shaft 17d to the traction component 20d. This multi-stage gear configuration allows the operator to apply controlled force while achieving heavy-load lifting. These gears also provide speed reduction, thereby enabling precise load positioning and control during lifting and lowering operations.

[0070] The first braking element 30d is a Weston-type load brake and includes a gear disc 31d and one or more pawls 32d. The gear disc 31d is fixed to a segment of the rotating shaft 17d extending from the gearbox 18d. Figure 14 In some embodiments shown, a pawl 32d is rotatably connected to an outer surface of the gearbox 18d to provide a mechanical interface for controlling the rotation of the gear disc 31d. The detailed structure and operating mechanism of the first braking element 30d in this embodiment are similar to those shown in [the original text]. Figure 3 The first braking element 30 described in the relevant embodiments will not be repeated here for the sake of simplicity.

[0071] Refer again Figure 13 In some embodiments, the second braking element 40d includes a side plate 41d and an anti-fall element 46d. The side plate 41d is securely fixed to an inner surface of the first housing plate 11d of the housing 10d, and the anti-fall element 46d is fixed to the first engagement portion 22d of the traction member 20d, thereby causing the anti-fall element to rotate synchronously with the traction member.

[0072] according to Figure 15 In some embodiments shown, the side plate 41d includes a through hole 411d aligned with an axis L7, allowing the first engagement portion 22d of the traction member 20d to pass through. The side plate 41d further includes a fixed engagement structure 412d arranged circumferentially along the inner edge of the through hole 411d. The engagement structure 412d may include a plurality of teeth or notches. The anti-fall element 46d includes 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 of other components. Figure 4 The structure presented in the text will not be elaborated upon here for the sake of simplicity.

[0073] In some embodiments, such as Figure 15 As shown, the first engagement portion 22d extends along axis L7 from the first transverse panel 211d of the load portion 21d and has a circular outer surface. To maintain synchronized rotation between the anti-fall element 46d and the traction component 20d, an adapter 47d is used to secure the rotating disk 42d to the first engagement portion 22d. The outer surface of the adapter 47d can be shaped to have a non-circular profile, such as a hexagonal structure or other angled geometry with multiple flat surfaces or edges, while the inner periphery of the rotating disk 42d is correspondingly shaped to have a complementary profile that matches the outer profile of the adapter. This angled connection structure ensures a fully mechanical engagement to prevent any relative rotation between the adapter 47d and the rotating disk 42d when the traction component 20d is rotated. The hexagonal or multifaceted structure provides multiple contact surfaces that distribute rotational forces evenly and enhance the reliability of the rotational coupling under high torque conditions. The adapter 47d can be fitted with suitable components (such as...) Figure 15 A locking ring 48d shown is fixed to the first engagement portion 22d. However, the embodiments are not limited thereto. In some other embodiments, the adapter 47d is omitted, and the outer contour of the first engagement portion 22d is directly shaped to have an angled feature complementary to the inner periphery of the rotating disk 42d to prevent relative rotation by direct geometric engagement.

[0074] The lifting device described in the embodiments of this utility model provides a substantial improvement over conventional lifting device designs by incorporating a second braking element that operates independently of the first braking element and the transmission assembly. The second braking element is directly mounted on the traction component, addressing weaknesses in conventional lifting device designs and ensuring that load control is maintained even in the event of severe component failure. This represents a significant improvement in lifting technology, providing enhanced safety and reliability for operators in various industrial applications.

[0075] The foregoing outlines the structure of several embodiments, enabling those skilled in the art to better understand the various aspects of this invention. Those skilled in the art should understand that this invention can be readily used as a basis for designing or modifying other processes and structures for achieving the same purposes and / or advantages as the embodiments introduced herein. Those skilled in the art should also recognize that these equivalent constructions do not depart from the spirit and scope of this invention, and that various changes, substitutions, and modifications can be made herein without departing from the spirit and scope of this invention.

[0076] [Symbol Explanation]

[0077] 1. Lifting device

[0078] 1a Lifting device

[0079] 1b Lifting device

[0080] 1c Lifting device

[0081] 1d lifting device

[0082] 10. Shell

[0083] 10c housing

[0084] 10d housing

[0085] 11 First shell plate

[0086] 11c First shell plate

[0087] 11d First shell plate

[0088] 12 Second shell plate

[0089] 12c Second shell plate

[0090] 12d Second Shell Plate

[0091] 13 Fixing hooks

[0092] 14 Load hooks

[0093] 15 chains

[0094] 16 Load-bearing shafts

[0095] 16c load shaft

[0096] 17c Rotating Shaft

[0097] 17d Rotating Shaft

[0098] 18c gearbox

[0099] 18d gearbox

[0100] 20 Traction components

[0101] 20a Traction Components

[0102] 20c Traction Components

[0103] 20d traction components

[0104] 21 Load Section

[0105] 21c Load Section

[0106] 21d Load Section

[0107] 22 First joint portion

[0108] 22a First joint portion

[0109] 22c First joint portion

[0110] 22d First joint portion

[0111] 23 Second joint portion

[0112] 24 First Extension

[0113] 25 Second Extension

[0114] 26 Hollow Channel

[0115] 26c Hollow Channel

[0116] 30 First braking element

[0117] 30c First braking element

[0118] 30d First braking element

[0119] 31 Gear Disc

[0120] 31c Gear Disc

[0121] 31d gear disc

[0122] 32. Razor Claw

[0123] 32c pawl

[0124] 32d pawl

[0125] 33 Elastic components

[0126] 40 Second braking element

[0127] 40c Second Braking Element

[0128] 40d Second Braking Element

[0129] 41 Side panels

[0130] 41c side panel

[0131] 41d side panel

[0132] 42 Rotating disk

[0133] 42c rotating disk

[0134] 42d rotating disk

[0135] 43 Locking latch

[0136] 43c Locking latch

[0137] 43d locking latch

[0138] 44 Springs

[0139] 44c spring

[0140] 44d spring

[0141] 45 lids

[0142] 45c lid

[0143] 45d cover

[0144] 46 Anti-fall components

[0145] 46c Anti-fall element

[0146] 46d anti-fall element

[0147] 47c adapter

[0148] 47d adapter

[0149] 48c locking ring

[0150] 48d locking ring

[0151] 50 Transmission Assembly

[0152] 50C drivetrain

[0153] 50d drivetrain

[0154] 51 Gears

[0155] 51c Gear

[0156] 51d Gear

[0157] 52 Gears

[0158] 52c gear

[0159] 52d gear

[0160] 53 Gears

[0161] 53d Gear

[0162] 54 Gears

[0163] 60 Operating components

[0164] 60b Operating components

[0165] 60c Operating components

[0166] 60d operating components

[0167] 61 Handle

[0168] 62 Manual Sprocket

[0169] 63 Manual Chain

[0170] 161 First End

[0171] 161c First end

[0172] 162 Second End

[0173] 162c Second End

[0174] 171c First end

[0175] 172c Second End

[0176] 191 Support pin

[0177] 192 Support pin

[0178] 210 Body / Cylindrical Body

[0179] 210d body

[0180] 211 First horizontal panel

[0181] 211d First Horizontal Panel

[0182] 212 Second Horizontal Panel

[0183] 212d Second Horizontal Panel

[0184] 411 Perforation

[0185] 411c perforation

[0186] 411d perforation

[0187] 412 Fixed joint structure / Joint structure

[0188] 412c Fixed joint structure

[0189] 412d Fixed joint structure / joint structure

[0190] 421 Upper surface

[0191] 422 Groove

[0192] 423 First positioning hole

[0193] 431 inner end

[0194] 432 outer end

[0195] 433 Top protrusion

[0196] 434 Bottom protrusion

[0197] 451 Second positioning hole

[0198] L1 axis

[0199] L2 Rotation Axis

[0200] L3 Rotation Axis

[0201] L4 Rotation Axis

[0202] L5 axis

[0203] L6 Rotary Axis

[0204] L7 axis.

Claims

1. A lifting device, characterized in that, include: case; A traction component, rotatable about an axis and mounted on the housing, the traction component including a load portion and a first engagement portion; A transmission assembly configured to transmit driving force to rotate the traction component; A first braking element is connected to the transmission assembly and configured to limit the rotational movement of the traction member in a predetermined direction; and The second braking element includes: Side plate, which is connected to the housing and has a fixed engagement structure configured around the axis; A rotating disk, which is connected to the first engaging portion of the traction component; and A plurality of locking latches are positioned on the rotating disk and configured to engage the fixed engagement structure.

2. The lifting device according to claim 1, characterized in that, A plurality of grooves are formed in the rotating disk to receive the plurality of locking latches, and the second braking element further includes: A plurality of springs, each spring connected to a corresponding locking latch and the rotating disk, wherein the plurality of springs are configured such that when the rotational speed of the traction member exceeds a predetermined value, the plurality of locking latches extend out of the plurality of grooves due to centrifugal force to engage the fixed engagement structure.

3. The lift device of claim 2, wherein, A first positioning hole is formed on the edge of each of the plurality of grooves on the rotating disk, wherein the inner end of each of the plurality of locking latches has a bottom protrusion pivotally mounted in the first positioning hole, and the outer end of each of the plurality of locking latches is connected to a corresponding spring.

4. The lifting device according to claim 3, characterized in that, The second braking element further includes a cover positioned on the surface of the rotating disk having the plurality of grooves, wherein a plurality of second positioning holes are formed corresponding to the first positioning hole, and the inner end of each of the plurality of locking latches has a top protrusion pivotally mounted in the corresponding second positioning hole.

5. The lift device of claim 1, wherein, The rotating disk and the plurality of locking latches positioned thereon are radially inwardly spaced relative to the fixed engagement structure, such that during normal operation, the plurality of locking latches do not come into direct contact with the fixed engagement structure until the rotational speed of the traction member exceeds a predetermined value, causing the plurality of locking latches to extend outward and engage the fixed engagement structure due to centrifugal force.

6. The lift device according to any one of claims 1 to 5, wherein The traction component has a hollow channel extending along the axis and further includes a second engagement portion, and The transmission assembly includes: A load-bearing shaft member extending along the axis through the hollow channel from a first end to a second end; and A plurality of gears are connected to the second end of the load shaft and the second engagement portion of the traction component.

7. The lift device of claim 6, wherein, The first engagement portion and the second engagement portion are connected to both ends of the load portion, and the second braking element and the plurality of gears are respectively engaged with the first engagement portion and the second engagement portion at opposite sides of the housing.

8. The lift device of claim 1, wherein, The load portion and the first engagement portion are integrally formed, and the rotating disk of the second braking element is directly fixed to the first engagement portion.

9. The lifting device according to any one of claims 1 to 5, characterized in that, Further includes: A load shaft extending along the axis and fixed to the housing, wherein the traction component is rotatably supported by the load shaft; The transmission assembly includes: A rotating shaft, rotatably supported by the housing, wherein the first braking element is connected to the rotating shaft; and A gear, which is fixed to the traction component and connected to the rotating shaft.

10. The lifting device according to any one of claims 1 to 5, characterized in that, It further includes two support pins connected along the axis to the traction component and rotatably connected to the housing. The transmission assembly includes: A rotating shaft, rotatably supported by the housing; and A gear, which is fixed to one of the two support pins and connected to the rotating shaft.

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