A fall arrestor

Abstract

The present disclosure relates to the technical field of fall arresters, and one embodiment of the present disclosure provides a fall arrester, which comprises a pair of housings, a lifting hook and a pull hook, the housings are fixedly connected through bolts, the lifting hook and the pull hook are respectively connected to the top and the bottom of the housings, a middle shaft is rotatably connected to the inner surface of one of the housings through a bearing, a fall arrest limiting assembly is arranged in the middle shaft and the housing, the fall arrest limiting assembly comprises a rotating disc, the rotating disc is sleeved and connected to the middle shaft, a disc spring is connected between the middle shaft and the inside of the rotating disc, a limiting tooth groove is formed around the inner surface of the housing, and a plurality of protrusions are arranged on the surfaces of the two sides of the rotating disc. Through the above technical scheme, the technical problem that the existing fall arresters in the prior art generally have simple structure design and need to be disassembled as a whole to reset after the locking structure is triggered is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of fall arresters, and more specifically, to a fall arrester. Background Technology

[0002] In high-altitude operations such as construction, power maintenance, and bridge upkeep, fall arresters are critical protective devices ensuring the safety of workers. Through an internal locking mechanism, they quickly brake in the event of a sudden fall, limiting the fall distance (typically ≤1.5m) and preventing injuries or fatalities. With increasing emphasis on safety in high-altitude operations, the frequency of use and reliability requirements for fall arresters have significantly increased. However, existing fall arresters generally suffer from simple structural designs and require complete disassembly for resetting after the locking mechanism is activated, severely impacting work continuity and increasing safety hazards and operating costs.

[0003] Traditional fall arresters typically employ mechanical triggering mechanisms such as pawl-ratchet or steel ball-wedge groove. When an overspeed fall (speed > 1.5 m / s) is detected, the locking mechanism quickly engages the brake rope / belt. However, the reset process after triggering requires a complex disassembly procedure: operators must first remove the fall arrester from the work site, then use specialized tools to disassemble the outer shell, manually adjust the locking mechanism to reset, and finally reassemble and test it. If a sudden mis-triggering or brief fall occurs during high-altitude operations, frequent disassembly and reset can disrupt the work, reducing efficiency and increasing safety risks by requiring operators to perform disassembly at height.

[0004] Therefore, developing a fall arrestor that can reset the locking structure without disassembly has become an urgent need to improve the safety and efficiency of high-altitude operations. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a fall arrestor that solves the technical problem that existing fall arrestors generally have simple structural designs and require complete disassembly to reset after the locking structure is triggered.

[0006] According to one aspect, at least one embodiment of this disclosure provides a fall arrestor, comprising: A pair of housings, a hook, and a pull hook are provided, the housings being fixedly connected by bolts, and the hook and pull hook being respectively connected to the top and bottom of the housings; A central shaft and a fall arrestor assembly, wherein the central shaft is rotatably connected to the inner surface of one of the housings via a bearing, and the fall arrestor assembly is disposed within the central shaft and the housing; The fall protection limiting component includes a rotating disk, which is fitted onto the central shaft. A disc spring connects the central shaft and the interior of the rotating disk. Limiting grooves are formed around the inner surface of the outer shell, and several protrusions are provided on both sides of the rotating disk.

[0007] As a further technical solution, a limiting pawl is rotatably connected to the protrusion, and several ear plates are provided on both sides of the rotating disk. A reset tension spring is connected between the ear plates and the limiting pawl, and several limiting blocks are provided on both sides of the rotating disk.

[0008] As a further technical solution, a steel rope is wound around the rotating disk, one end of the steel rope is connected to the hook, a threaded groove is opened at one end of the central shaft, a limit sleeve is provided on the surface of the rotating disk, and a round hole is opened on the surface of the rotating disk.

[0009] As a further technical solution, a pressure plate is installed inside the rotating disk, and a bolt is inserted into the pressure plate. One end of the bolt passes through the circular hole and is connected to the threaded groove through a threaded engagement.

[0010] As a further technical solution, an anti-wear sleeve is movably fitted between the bottom of the outer shell, and the anti-wear sleeve is wrapped around the outside of the steel rope.

[0011] As a further technical solution, the top of the outer shell is provided with an anti-slip sleeve, which is rotatably connected to the outside of the lower end of the hook, and the lower end of the hook has a T-shaped cross-section.

[0012] As a further technical solution, the front limiting portion of the limiting pawl has a larger volume and weight than the tail end of the rotating connection.

[0013] As a further technical solution, one side of the inner wall of the outer casing is slidably fitted with one end of the bolt.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the fall arrestor limiting component solves the problem of traditional fall arrestors requiring disassembly and repositioning after stopping by employing a centrifugal trigger and convenient reset design. The rotating disc and coil spring work together to achieve automatic steel cable retrieval without manual handling; the limiting pawl quickly engages with the tooth groove under centrifugal force, ensuring timely and reliable emergency stopping; the reset spring and manual pawl design allow for immediate reuse without disassembling the outer casing after stopping, significantly shortening reset time and preventing interruptions to high-altitude operations. This structure not only ensures safety during sudden falls but also improves operational continuity, reduces additional safety risks associated with reset operations, and meets the dual requirements of high-altitude operations for both protective efficiency and convenience. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure; Figure 2 This is an isometric sectional view of the present disclosure; Figure 3 This is a schematic diagram of the rotating disk portion of this disclosure; In the diagram: 1. Outer shell; 2. Hook; 3. Pull hook; 4. Central shaft; 5. Fall protection limiting assembly; 5-1. Rotary disc; 5-2. Disc spring; 5-3. Limiting tooth groove; 5-4. Protrusion; 5-5. Limiting pawl; 5-6. Ear plate; 5-7. Reset tension spring; 5-8. Limiting stop; 5-9. Steel rope; 5-10. Threaded groove; 5-11. Limiting sleeve; 5-12. Round hole; 5-13. Pressure plate; 5-14. Bolt; 6. Anti-wear sleeve; 7. Anti-disengagement sleeve. Detailed Implementation

[0017] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0020] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-3 As shown, a fall arrestor according to an embodiment of the present disclosure is illustrated, comprising: A pair of outer shells 1, a hook 2 and a pull hook 3 are provided. The outer shells 1 are fixedly connected to each other by bolts 5-14. The hook 2 and the pull hook 3 are respectively connected to the top and bottom of the outer shells 1. The central shaft 4 and the fall protection limiting component 5 are provided. The central shaft 4 is rotatably connected to the inner surface of one of the outer shells 1 via a bearing. The fall protection limiting component 5 is disposed inside the central shaft 4 and the outer shell 1. The fall arresting and limiting component 5 includes a rotating disk 5-1, which is fitted onto the central shaft 4. A disc spring 5-2 connects the central shaft 4 and the interior of the rotating disk 5-1. Limiting grooves 5-3 are formed around the inner surface of the outer shell 1. Several protrusions 5-4 are provided on both sides of the rotating disk 5-1, and limiting pawls 5-5 are rotatably fitted onto each protrusion 5-4. Several ear plates 5-6 are provided on both sides of the rotating disk 5-1, and a return spring 5-7 connects the ear plates 5-6 to the limiting pawls 5-5. Both sides of the rotating disk 5-1 are provided with several limiting blocks 5-8. A steel rope 5-9 is wound and connected on the rotating disk 5-1. One end of the steel rope 5-9 is connected to the hook 3. One end of the central shaft 4 is provided with a threaded groove 5-10. A limiting sleeve 5-11 is provided on the surface of the rotating disk 5-1. A round hole 5-12 is provided on the surface of the rotating disk 5-1. A pressure plate 5-13 is installed inside the rotating disk 5-1. A bolt 5-14 is inserted into the pressure plate 5-13. One end of the bolt 5-14 passes through the round hole 5-12 and is connected to the threaded groove 5-10 by threaded engagement.

[0024] In some examples, to achieve automatic stopping of the fall arrestor during rapid descent and prevent falls caused by the overspeed release of the steel cable 5-9, and to meet the safety protection requirements of high-altitude work scenarios, a fall arrestor limiting component 5 is designed. This component includes a central shaft 4 rotatably connected to the inner surface of the outer shell 1 via bearings, providing stable rotational support for the rotating disk 5-1. The rotating disk 5-1 is mounted on the central shaft 4, and the disc spring 5-2 connected to the central shaft 4 inside has an elastic reset function. When the hook 3 pulls the steel cable 5-9 downward, the rotating disk 5-1 unfolds and rotates synchronously with the steel cable 5-9, and the disc spring 5-2 is twisted and stores force. When the descent stops or reset is required, the disc spring 5-2 releases its elastic force, causing the rotating disk 5-1 to rotate in the opposite direction, rewinding the steel cable 5-9 onto the rotating disk 5-1, achieving automatic retrieval of the steel cable 5-9 without manual handling, thus improving ease of use.

[0025] The limiting toothed groove 5-3 around the inner surface of the outer shell 1 forms a stop-locking structure with the limiting pawls 5-5 on both sides of the rotating disk 5-1. The protrusions 5-4 on both sides of the rotating disk 5-1 provide a rotation fulcrum for the limiting pawls 5-5, allowing the limiting pawls 5-5 to rotate flexibly around the protrusions 5-4. The reset tension spring 5-7 connecting the ear plate 5-6 and the limiting pawls 5-5 normally pulls the limiting pawls 5-5 toward the center of the rotating disk 5-1, moving the pawls away from the limiting toothed groove 5-3, ensuring that the rotating disk 5-1 rotates normally without obstruction and does not affect the normal release and retrieval of the steel rope 5-9.

[0026] When the fall arrestor descends rapidly (such as in the event of a sudden fall), the rotation speed of the rotating disk 5-1 increases sharply. Under the action of centrifugal force, the limiting pawl 5-5 overcomes the tension of the reset spring 5-7 and is thrown outward. Its end is engaged in the limiting tooth groove 5-3 on the inner side of the outer shell 1. The engagement between the pawl and the tooth groove restricts the rotating disk 5-1 from continuing to rotate, thereby preventing the steel rope 5-9 from being released further, achieving rapid stopping and avoiding the risk of falling.

[0027] The limiting blocks 5-8 on both sides of the rotating disk 5-1 can limit the maximum rotation angle of the limiting pawl 5-5 when it rotates outward, preventing the pawl from overturning due to excessive centrifugal force and causing structural damage. At the same time, it ensures that the pawl can be accurately engaged in the limiting tooth groove 5-3 to avoid misalignment affecting the stopping effect.

[0028] The threaded groove 5-10 at one end of the central shaft 4, the limiting sleeve 5-11 on the surface of the rotating disk 5-1, the clamping plate 5-13, and the bolt 5-14 form a fixing structure. The bolt 5-14 passes through the round hole 5-12 of the rotating disk 5-1 and engages with the threaded groove 5-10 of the central shaft 4. When the bolt 5-14 is tightened, the clamping plate 5-13 tightly fixes the rotating disk 5-1 and the central shaft 4, preventing relative sliding between the rotating disk 5-1 and the central shaft 4 during rotation, and ensuring stable power transmission when the disc spring 5-2 stores and releases its force. The limiting sleeve 5-11 positions the clamping plate 5-13, preventing the clamping plate 5-13 from shifting and causing fixing failure, further improving the reliability of the connection between the rotating disk 5-1 and the central shaft 4.

[0029] During normal descent, the rotating disk 5-1 rotates smoothly, and the limiting pawl 5-5 is constrained by the return spring 5-7 and does not engage with the tooth groove. In the event of a sudden rapid descent, centrifugal force causes the pawl to engage with the tooth groove to stop the descent. After the descent stops, the pawl is manually adjusted to disengage from the tooth groove, and the coil spring 5-2 drives the rotating disk 5-1 to reset and retrieve the steel rope 5-9. Centrifugal triggering ensures timely stopping, and the coil spring 5-2's reset mechanism facilitates easy use. The coordinated operation of multiple components ensures reliable stopping of the fall arrestor during rapid descent, providing safety assurance for high-altitude operations.

[0030] For example, such as Figure 3 As shown, an anti-wear sleeve 6 is movably fitted between the bottom of the outer shell 1, and the anti-wear sleeve 6 is wrapped around the outside of the steel rope 5-9.

[0031] In some examples, the abrasion-resistant sleeve 6, which is movably connected between the bottom of the shells, wraps around the steel rope 5-9. This directly isolates the steel rope 5-9 from frictional contact with the bottom of the shell 1, preventing the steel rope 5-9 from being scratched by the edge of the shell 1 during repeated winding and unwinding, or from wearing down and breaking due to friction, thus extending the service life of the steel rope 5-9. The abrasion-resistant sleeve 6 is made of wear-resistant material and is movable, moving synchronously with the winding and unwinding of the steel rope 5-9, always adhering to the surface of the steel rope 5-9, ensuring full-range protection without blind spots.

[0032] For example, such as Figure 2 As shown, the top of the outer shell 1 is provided with an anti-detachment sleeve 7, which is rotatably connected to the outside of the lower end of the hook 2. The lower end of the hook 2 has a T-shaped cross-section.

[0033] In some examples, the anti-slip sleeve 7 on the top of the outer casing 1 is rotatably fitted onto the lower end of the hook 2, and the lower end of the hook 2 has a T-shaped cross-section. The T-shaped structure can axially restrict the position of the anti-slip sleeve 7, preventing it from slipping off the lower end of the hook 2 and ensuring that the anti-slip sleeve 7 always covers the connection between the hook 2 and the outer casing 1. The anti-slip sleeve 7 can rotate flexibly with the hook 2 without affecting the normal hook-up operation.

[0034] For example, such as Figure 3 As shown, the front limiting portion of the limiting pawl 5-5 has a larger volume and weight than the tail end of the rotating connection.

[0035] In some examples, the front limiting portion of the pawl 5-5 is larger and heavier than the tail end of the rotating connection. This weight distribution design increases the centrifugal force at the front end. When the rotating disk 5-1 rotates rapidly, the front end generates a stronger centrifugal force due to its greater weight, which can more easily overcome the tension of the return spring 5-7 and be thrown outward. This ensures that the pawl can quickly and accurately engage with the limiting tooth groove 5-3, shortening the stop response time, avoiding pawl trigger delay due to insufficient centrifugal force, and improving the stopping sensitivity of the fall arrestor in the event of a sudden fall.

[0036] For example, such as Figure 2 As shown, the inner wall of the outer shell 1 on one side is slidably fitted with one end of the bolt 5-14.

[0037] In some examples, the inner wall of one side of the outer shell 1 slides against one end of the bolt 5-14, which can provide radial support for the bolt 5-14, preventing the bolt 5-14 from loosening or shifting due to vibration during the rotation of the rotating disk 5-1, ensuring that the bolt 5-14 is always stably connected to the rotating disk 5-1 and the central shaft 4, and avoiding relative sliding between the rotating disk 5-1 and the central shaft 4, which would cause the power transmission of the disc spring 5-2 to fail.

[0038] In practical use: The fall arrestor is attached to a stable structure at the high-altitude work site via the top hook 2. The anti-disengagement sleeve 7 rotates with the hook 2 to prevent loosening of the connection. The pull hook 3 connects to the worker's safety equipment. During normal descent, the worker slowly lowers their body. The pull hook 3 drives the steel cable 5-9 to unfold from the rotating disk 5-1. The rotating disk 5-1 rotates smoothly around the central axis 4. The coil spring 5-2 is twisted and stores power. The limiting pawl 5-5, constrained by the return spring 5-7, adheres to the rotating disk 5-1 and does not engage with the limiting tooth groove 5-3 on the inner side of the outer shell 1, ensuring the smooth release of the steel cable 5-9. If a sudden fall causes the steel cable 5-9 to release rapidly, the rotation speed of the rotating disk 5-1 increases sharply. The limiting pawl 5-5, under the action of centrifugal force, overcomes the tension of the return spring 5-7 and is thrown outward. Its front end engages with the limiting tooth groove 5-3, restricting the rotation of the rotating disk 5-1 and achieving an emergency stop. After stopping, manually move the limit pawl 5-5 to disengage it from the tooth groove. The coil spring 5-2 releases its elasticity, causing the rotating disk 5-1 to rotate in the opposite direction, rewinding the steel rope 5-9. The reset can be completed without disassembling the outer shell 1. During the winding and unwinding of the steel rope 5-9, the anti-wear sleeve 6 at the bottom of the outer shell 1 prevents the steel rope 5-9 from being damaged by friction with the outer shell 1, ensuring safety and ease of operation for high-altitude operations throughout the process.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A fall arrestor, characterized in that, include: A pair of outer shells (1), a hook (2) and a pull hook (3), the outer shells (1) being fixedly connected by bolts (5-14), the hook (2) and the pull hook (3) being respectively connected to the top and bottom of the outer shells (1); A central shaft (4) and a fall arrestor assembly (5) are provided. The central shaft (4) is rotatably connected to the inner surface of one of the housings (1) via a bearing. The fall arrestor assembly (5) is disposed within the central shaft (4) and the housing (1). The fall protection limiting component (5) includes a rotating disk (5-1), which is fitted onto the central shaft (4). A disc spring (5-2) is connected between the central shaft (4) and the interior of the rotating disk (5-1). A limiting tooth groove (5-3) is formed around the inner surface of the outer shell (1). Several protrusions (5-4) are provided on both sides of the rotating disk (5-1).

2. The fall arrestor according to claim 1, characterized in that, A limiting pawl (5-5) is rotatably mounted on the protrusion (5-4). Several ear plates (5-6) are provided on both sides of the rotating disk (5-1). A reset spring (5-7) is connected between the ear plate (5-6) and the limiting pawl (5-5). Several limiting blocks (5-8) are provided on both sides of the rotating disk (5-1).

3. A fall arrestor according to claim 2, characterized in that, A steel rope (5-9) is wound around the rotating disk (5-1). One end of the steel rope (5-9) is connected to the hook (3). A threaded groove (5-10) is provided at one end of the central shaft (4). A limit sleeve (5-11) is provided on the surface of the rotating disk (5-1). A round hole (5-12) is provided on the surface of the rotating disk (5-1).

4. A fall arrestor according to claim 3, characterized in that, A pressure plate (5-13) is installed inside the rotating disk (5-1), and a bolt (5-14) is inserted inside the pressure plate (5-13). One end of the bolt (5-14) passes through the round hole (5-12) and is connected to the threaded groove (5-10) by thread engagement.

5. A fall arrestor according to claim 3, characterized in that, A wear-resistant sleeve (6) is movably fitted between the bottom of the outer shell (1), and the wear-resistant sleeve (6) is wrapped around the outside of the steel rope (5-9).

6. A fall arrestor according to claim 1, characterized in that, The top of the outer shell (1) is provided with an anti-slip sleeve (7), which is rotatably connected to the outside of the lower end of the hook (2). The lower end of the hook (2) has a T-shaped cross-section.

7. A fall arrestor according to claim 2, characterized in that, The front limiting portion of the limiting pawl (5-5) has a larger volume and weight than the tail end of the rotating connection.

8. A fall arrestor according to claim 4, characterized in that, The inner wall of the outer shell (1) on one side is slidably attached to one end of the bolt (5-14).

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