Webbing fall arrestor and webbing hub therefor

Abstract

A webbing fall arrestor includes a webbing hub located between two shaft holes of a bracket. The webbing hub comprises a central cylinder and lateral rings coaxially connected to both sides of the central cylinder. At least one lateral ring is detachably connected to the central cylinder. The central cylinder includes a bushing and a bushing. Multiple turns of webbing wound around the bushing are attached to the central cylinder. A shaft assembly is tightly fitted onto the bushing, with both ends rotatably passing through the two shaft holes. Two pawl blocks are pivotally connected to a mounting portion at one end. A brake ratchet is attached to the bracket for engagement when the two pawl blocks swing outward. A spiral spring is provided between the bracket and the shaft assembly. By designing at least one lateral ring to be separable from the central cylinder, the lateral rings do not need to be injection molded together with the central cylinder during manufacturing, thus avoiding warping defects on the outer periphery of the lateral rings.

Description

Technical Field

[0001] This utility model relates to a safety device to prevent people from falling from heights; in particular, it refers to a webbing fall arrestor and its webbing hub. Background Technology

[0002] Existing webbing fall arrestors feature a rotatable webbing hub on their frame. The webbing is wound around the hub and connected to a braking mechanism. When the webbing fall arrestor is fixed in place and the outer end of the webbing is connected to the user's harness, if the user falls from a height, pulling on the webbing causes the hub to rotate rapidly. The braking mechanism then prevents the hub from continuing to rotate, releasing the webbing and thus preventing the person from falling further, achieving a fall arrest effect.

[0003] The existing webbing fall arrestor's webbing hub consists of a central cylinder and two lateral rings integrally connected to it, and the webbing hub is manufactured using a plastic injection molding process. When the plastic is injected into the webbing hub, the periphery of the lateral rings connected to the central cylinder is prone to warping, resulting in defects. If the lateral rings of the webbing hub have warped edges, they may interfere with the support during rotation, or cause obstruction when the webbing wraps around or is released from the webbing hub. Therefore, the existing webbing hub structure needs improvement to increase the manufacturing yield of the webbing hub. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a webbing fall arrestor, wherein the webbing hub has a separable lateral ring, thereby making the lateral ring less prone to deformation during manufacturing, improving the quality of the manufactured webbing hub, and increasing the yield of webbing hub manufacturing.

[0005] To achieve the above objectives, this utility model provides a webbing fall arrestor, comprising a bracket, a webbing hub, a webbing, a shaft assembly, a braking assembly, and a spiral spring. The bracket has a first shaft hole and a second shaft hole on opposite sides, with a centerline defined by the line connecting the centers of the first and second shaft holes. The webbing hub is disposed within the bracket and includes a central cylinder, a first lateral ring, and a second lateral ring. The central cylinder includes a bushing and a bushing, with the centerline of the bushing coaxial with the centerline. The bushing is coaxially arranged around the outside of the bushing, forming a groove between the bushing and the bushing. An opening is formed on one side of the bushing, and the groove communicates with the opening. The first and second lateral rings are coaxially connected to both sides of the central cylinder, and at least one of the first and second lateral rings is detachably connected to the central cylinder.

[0006] One end of the webbing forms a loop, which is located in the loop groove and fitted onto the bushing. The webbing passes through the opening and wraps around the bushing in multiple turns. One end of the shaft assembly is rotatably inserted into the first shaft hole and forms a mounting portion at that end. The middle of the shaft assembly is tightly fitted into the bushing, and the other end of the shaft assembly is rotatably inserted into the second shaft hole. The braking assembly is pivotally connected to at least two pawl blocks at the mounting portion. The at least two pawl blocks are arranged around the axis. When the rotational speed of the braking assembly exceeds a predetermined speed, the at least two pawl blocks swing outward due to centrifugal force. At least one brake ratchet is coupled to the bracket, and the at least one brake ratchet is located at a position where it can engage with the at least two pawl blocks when they swing outward. The spiral spring has two ends, one of which is coupled to the end of the shaft assembly that extends out of the second shaft hole, and the other end of the spiral spring is connected to the bracket.

[0007] To achieve the above objectives, this utility model provides a webbing hub, comprising a central cylinder, a first lateral ring, and a second lateral ring. The central cylinder includes a bushing and a bushing. The bushing is coaxially disposed around the outside of the bushing, forming a groove between the bushing and the bushing. An opening is formed on one side of the bushing, and the groove communicates with the opening. The first lateral ring and the second lateral ring are coaxially connected to both sides of the central cylinder, and at least one of the first lateral ring and the second lateral ring is detachably connected to the central cylinder.

[0008] The advantage of this invention is that, since at least one of the first lateral ring and the second lateral ring is detachably connected to the central cylinder, the lateral ring does not need to be injection molded together with the central cylinder during manufacturing. Therefore, it is easy to manufacture it into the correct shape, which can avoid the defect of warping on the outer periphery of the lateral ring and improve the manufacturing yield of the webbing hub. Attached Figure Description

[0009] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0010] Figure 2 This is an exploded view of the preferred embodiment of the present invention.

[0011] Figure 3 for Figure 2 An exploded view of the webbing hub.

[0012] Figure 4 for Figure 2 An exploded view of the webbing hub from another angle.

[0013] Figure 5 for Figure 3A three-dimensional view of the central cylinder.

[0014] Figure 6 for Figure 3 Left-side view of the central cylinder.

[0015] Figure 7 This is an exploded view of the preferred embodiment of the present invention, showing the separation of the side cover and the spiral spring.

[0016] Figure 8 for Figure 1 Top view.

[0017] Figure 9 for Figure 8 A cross-sectional view along the 9-9 direction.

[0018] Figure 10 for Figure 8 A cross-sectional view along the 10-10 direction.

[0019] Figure 11 for Figure 1 Front view.

[0020] Figure 12 for Figure 11 A cross-sectional view along the 12-12 direction.

[0021] Explanation of reference numerals in the attached figures

[0022] 100: Webbing fall arrestor

[0023] 10: Bracket

[0024] 12: First side panel

[0025] 121: First shaft hole

[0026] 14: Second side panel

[0027] 141: Second shaft hole

[0028] 16: Connecting plate

[0029] 161: Hanging ring mounting hole

[0030] 18: Collar

[0031] 20: Webbing Hub

[0032] 22: Central tube

[0033] 221: Bushing

[0034] 222: Flange section

[0035] 223: Bump

[0036] 224: Positioning ring

[0037] 225: Liner

[0038] 2251: Opening

[0039] 2252: concave part

[0040] 2253: Mid-section perforation

[0041] 2254: Notch

[0042] 2255: Positioning post

[0043] 226: Collar groove

[0044] 24: First lateral ring

[0045] 241: First side hole

[0046] 242: Positioning hole

[0047] 26: Second lateral ring

[0048] 261: Annular groove

[0049] 262: Second side hole

[0050] 28: Fasteners

[0051] 30: Ribbon

[0052] 32: Ring

[0053] 34: Double-layer section

[0054] 40: Shaft assembly

[0055] 42: Friction block

[0056] 421: Shaft hole

[0057] 422: Rounded corners

[0058] 44: Installation panel

[0059] 441: Disc section

[0060] 442: Installation Department

[0061] 46: Shaft

[0062] 50: Braking components

[0063] 52: Ratchet Block

[0064] 521: Ratchet

[0065] 54: Spring

[0066] 56: Brake ratchet

[0067] 561: Locking protrusion

[0068] 60: Side cover

[0069] 62: Slot

[0070] 64: Scroll spring chamber

[0071] 70: Spiral Spring

[0072] L: Centerline Detailed Implementation

[0073] To more clearly illustrate this utility model, preferred embodiments are described in detail below with reference to the accompanying drawings. Please refer to... Figure 1 and Figure 2 As shown, a preferred embodiment of the present invention is a webbing fall arrestor 100, which includes a bracket 10, a webbing hub 20, a webbing 30, a shaft assembly 40, a braking assembly 50, a side cover 60, and a spiral spring 70.

[0074] The bracket 10 includes a first side plate 12, a second side plate 14, and a connecting plate 16. The first side plate 12 and the second side plate 14 are disposed opposite to each other. The first side plate 12 is an elongated strip extending in the vertical direction, and a first shaft hole 121 is formed in the middle of the first side plate 12, into which a collar 18 is fitted. The second side plate 14 is an elongated strip extending in the vertical direction, and a second shaft hole 141 is formed in the middle of the second side plate 14. The first shaft hole 121 and the second shaft hole 141 are disposed opposite to each other on both sides of the bracket 10, and a centerline L is defined by connecting the centers of the first shaft hole 121 and the second shaft hole 141. The connecting plate 16 has a lifting ring hole 161, and the edges of both sides of the connecting plate 16 are respectively connected to the upper edge of the first side plate 12 and the upper edge of the second side plate 14.

[0075] Please refer to Figures 2 to 6As shown, the webbing hub 20 is disposed within the bracket 10 and located between the first side plate 12 and the second side plate 14. The webbing hub 20 includes a central cylinder 22, a first lateral ring 24, and a second lateral ring 26. The central cylinder 22 includes a bushing 221, a flange portion 222, a plurality of protrusions 223, a positioning ring 224, and a bushing ring 225. The bushing 221 is a metal cylindrical tube with its centerline coaxial with the axis L. The centerline of the bushing 221 can also be used to define the axis L. The flange 222 is a metal annulus, and its inner periphery is connected to the periphery of one end of the bushing 221. The plurality of protrusions 223 are connected to the flange 222 and arranged around the bushing 221. The positioning ring 224 is a metal annulus formed on the surface of the flange 222 opposite to the plurality of protrusions 223, and its centerline is coaxial with the axis L. In this preferred embodiment, the bushing 221, the flange 222, the plurality of protrusions 223, and the positioning ring 224 are integrally connected metal structures.

[0076] The bushing 225 is a C-shaped plastic ring with an opening 2251. The outer diameter of the bushing 225 is larger than the outer diameter of the flange portion 222. The inner circumferential side of the bushing 225 covers the plurality of protrusions 223, and a recess 2252 is formed on the outer circumferential surface of the bushing 225 adjacent to the opening 2251. In this preferred embodiment, the inner circumferential side of the bushing 225 is covered by the plurality of protrusions 223 by insert injection molding. The bushing 225 is supported by the plurality of protrusions 223. The outer edge of the bushing 225 extends beyond the outer edge of the flange portion 222 in the radial direction, and the bushing 225 is coaxially arranged around the outside of the bushing 221. A plurality of intermediate through holes 2253 are provided on the outer periphery of the bushing 225. The plurality of intermediate through holes 2253 are arranged around the axis L. The peripheral wall of each intermediate through hole 2253 is C-shaped and forms a notch 2254 on the outer side. Two positioning posts 2255 are connected to the side of the bushing 225 away from the flange portion 222. The bushing 225 is spaced apart from the bushing 221, and a ring groove 226 is formed between the bushing 225 and the bushing 221. The ring groove 226 communicates with the opening 2251.

[0077] The first lateral ring 24 and the second lateral ring 26 are oppositely arranged annular bodies with the same outer diameter. The outer edges of the first lateral ring 24 and the second lateral ring 26 in the radial direction extend beyond the outer edge of the liner ring 225. A plurality of first side holes 241 and two positioning holes 242 are formed on the inner circumferential side of the first lateral ring 24. The plurality of first side holes 241 are threaded holes and are arranged around the axis L. The plurality of first side holes 241 communicate with one end of the plurality of intermediate through holes 2253. The two positioning holes 242 are fitted into the two positioning posts 2255, thereby positioning the first lateral ring 24 in the position of the central cylinder 22. The inner circumferential side of the first lateral ring 24 abuts against the side of the liner ring 225 away from the flange portion 222.

[0078] The second lateral ring 26 is fitted onto the positioning ring 224. An annular groove 261 is formed on the inner circumferential side of the second lateral ring 26. The annular groove 261 is fitted onto the flange portion 222, thereby positioning the second lateral ring 26 on the central cylinder 22. A plurality of second side holes 262 are also formed on the inner circumferential side of the second lateral ring 26. The plurality of second side holes 262 are countersunk holes and are located outside the annular groove 261. The plurality of second side holes 262 are arranged around the axis L and are respectively connected to the other end of the plurality of middle section through holes 2253.

[0079] A fastener 28 is inserted through each of the first side holes 241, each of the middle through holes 2253, and each of the second side holes 262 to connect the first lateral ring 24, the second lateral ring 26, and the central cylinder 22. In this preferred embodiment, each fastener 28 is a bolt, which passes through each of the second side holes 262 and each of the middle through holes 2253 and is screwed into each of the first side holes 241 for fixation. In other preferred embodiments, each of the first side holes 241 and each of the second side holes 262 can also be through holes. In this case, each fastener 28 can be replaced with a rivet or a bolt and nut assembly, so that each fastener 28 can also pass through each of the first side holes 241, each of the middle through holes 2253, and each of the second side holes 262 to connect the first lateral ring 24, the second lateral ring 26, and the central cylinder 22. In this preferred embodiment, the first lateral ring 24 may be a plastic ring or a metal ring, and the second lateral ring 26 may be a plastic ring or a metal ring.

[0080] In addition, when the inner circumferential side of the bushing 225 is covered by the plurality of protrusions 223 by means of insert injection molding, the first lateral ring 24 or the second lateral ring 26 can also be formed at the same time as the bushing 225, so that one of the first lateral ring 24 and the second lateral ring 26 is connected to the bushing 225, and the other of the first lateral ring 24 and the second lateral ring 26 that is not connected to the bushing 225 is detachably connected to the bushing 225.

[0081] Please refer to Figure 2 , Figure 6 and Figures 8 to 10 As shown, one end of the webbing 30 forms a loop 32, and the portion of the webbing 30 adjacent to the loop 32 is sewn to form a double-layer segment 34. The loop 32 is located in the loop groove 226 and fits onto the bushing 221. The double-layer segment 34 of the webbing 30 passes through the opening 2251, and the portion other than the double-layer segment 34 is wrapped around the bushing 225 in multiple turns. The portion of the double-layer segment 34 near the bushing 221 is located in the recess 2252, so that the outer surface of the double-layer segment 34 is aligned with the outer peripheral surface of the bushing 225, allowing the portion of the webbing 30 other than the double-layer segment 34 to be smoothly wrapped around the bushing 225.

[0082] Please refer to Figure 2 , Figure 7 and Figures 8 to 10 As shown, the shaft assembly 40 includes a friction block 42, a mounting plate 44, and a rotating shaft 46. The friction block 42 is a square prism with a rotating shaft hole 421 formed at its center and rounded corners 422 at each of its four corners. The friction block 42 is tightly fitted into the bushing 221 of the webbing hub 20. The rounded corners 422 are close to the inner circumferential surface of the bushing 221, preventing relative rotation between the bushing 221 and the friction block 42 due to static friction. When the torque applied to the bushing 221 and the friction block 42 is greater than the static friction between them, the bushing 221 can rotate relative to the friction block 42.

[0083] The mounting disk 44 has a disc portion 441 in the middle, which is rotatably inserted through the collar 18 and screwed onto the end of the friction block 42 facing the first shaft hole 121. A mounting portion 442 is provided around the mounting disk 44. The mounting portion 442 is an annular body located outside the first side plate 12, and its inner periphery is integrally connected to the outer periphery of the disc portion 441. The rotating shaft 46 is a long straight rod with its centerline coaxial with the axis L. The rotating shaft 46 is tightly fitted through the rotating shaft hole 421, and the portion of the rotating shaft 46 extending out of the rotating shaft hole 421 rotatably passes through the second shaft hole 141. One end of the rotating shaft 46 corresponding to the second shaft hole 141 extends out of the second shaft hole 141.

[0084] Please refer to Figure 2 and Figures 9 to 12 As shown, the braking assembly 50 includes two pawl blocks 52, two springs 54, and two brake ratchet teeth 56. The two pawl blocks 52 are arranged around the axis L and are pivotally connected to the mounting portion 442 at one end, with a ratchet tooth portion 521 formed at the other end of each pawl block 52. The two springs 54 are tension springs and are respectively connected between the ratchet tooth portion 521 of each pawl block 52 and the mounting portion 442. The two brake ratchet teeth 56 are metal blocks and are screwed onto the outer side of the first side plate 12. The two brake ratchet teeth 56 are respectively located on the upper and lower sides of the mounting portion 442. Each brake ratchet tooth 56 forms a locking protrusion 561 on the side facing the mounting disc 44. Each locking protrusion 561 is located at a position where it can engage with the two pawl blocks 52 when they swing outward due to centrifugal force, allowing the ratchet tooth portions 521 to engage.

[0085] Since each of the brake ratchet teeth 56 is a metal block and screwed into the first side plate 12, the structural strength of each brake ratchet tooth 56 is sufficient to withstand the force when each of the pawl blocks 52 engages, preventing deformation and damage when each brake ratchet tooth 56 jams against each pawl block 52. In addition to the preferred embodiment described above, where the braking assembly 50 includes two pawl blocks 52, the present invention may also include three or more pawl blocks 52. Furthermore, the number of brake ratchet teeth 56 provided in the braking assembly may be one or more than two.

[0086] Please refer to Figure 2 , Figure 7 and Figure 9As shown, the side cover 60 is a circular cover and is fixed to the outer side of the second side plate 14 by screws. The inner circumferential surface of the side cover 60 forms a slot 62, and inside it forms a spiral spring chamber 64. The spiral spring 70 is accommodated in the spiral spring chamber 64. The spiral spring 70 has two ends, one end of which is connected to the end of the rotating shaft 46 that passes through the second shaft hole 141, and the other end of the spiral spring 70 is fixed to the slot 62, thus indirectly connecting the spiral spring 70 to the bracket 10. In addition to indirectly connecting the spiral spring 70 to the bracket 10 through the side cover 60, this invention can also directly connect one end of the spiral spring 70 to the bracket 10 by riveting, screwing, or welding.

[0087] Please refer to Figure 2 and Figures 9 to 12 As shown, when the preferred embodiment of the present invention is used, the bracket 10 is fixed in one place, and the outer end of the webbing 30 is connected to the user's backpack safety belt. As the user moves away from the fixed point of the bracket 10, the webbing 30 is pulled outwards, causing the webbing hub 20 to rotate. During the rotation of the webbing hub 20, the bushing 221 of the webbing hub 20 drives the shaft assembly 40 to rotate together through static friction, causing the shaft assembly 40 to rotate and the spiral spring 70 to generate a restoring force. Therefore, as the user returns to the fixed point of the bracket 10, the restoring force of the spiral spring 70 drives the shaft assembly 40 to rotate the webbing hub 20, causing the webbing hub 20 to rewind the outwardly released webbing 30.

[0088] However, in the above usage scenario, if the user falls from a height and pulls the webbing 30 to make the webbing hub 20 rotate rapidly, the bushing 221 of the webbing hub 20 first drives the shaft assembly 40 to rotate rapidly through static friction, causing the rotation speed of the braking assembly 50 to exceed a predetermined speed. The two pawl blocks 52 swing outward due to centrifugal force resisting the restoring force of each spring 54, so that the ratchet portion 521 of each pawl block 52 engages with the locking protrusion 561 of each brake ratchet 56, stopping the shaft assembly 40 from rotating with the webbing hub 20, and fixing the shaft assembly 40 relative to the bracket 10 without rotating. At this time, the torque borne by the bushing 221 of the webbing hub 20 is greater than the static friction between the bushing 221 and the friction block 42, causing the webbing hub 20 to rotate relative to the shaft assembly 40. The dynamic friction between the bushing 221 and the friction block 42 brakes the webbing hub 20 until it stops rotating, thereby preventing the webbing hub 20 from continuing to rotate and releasing the webbing 30, thus preventing the human body from continuing to fall and achieving the fall prevention effect.

[0089] The above description is only a preferred and feasible embodiment of this utility model. Any equivalent changes made by applying the specification and claims of this utility model should be included within the patent scope of this utility model.

Claims

1. A webbing fall arrestor, characterized in that, include: A bracket, wherein a first shaft hole and a second shaft hole are respectively provided on opposite sides of the bracket, and a center line is defined by the line connecting the center of the first shaft hole and the second shaft hole; A webbing hub, disposed within the bracket, includes a central cylinder, a first lateral ring, and a second lateral ring; the central cylinder includes a bushing and a bushing, the centerline of the bushing being coaxial with the axis, the bushing being coaxially disposed around the outside of the bushing, forming a ring groove between the bushing and the bushing, and an opening being formed on one side of the bushing, the ring groove communicating with the opening; the first lateral ring and the second lateral ring are coaxially connected to both sides of the central cylinder, and at least one of the first lateral ring and the second lateral ring is detachably connected to the central cylinder; A webbing, one end of which forms a loop, the loop being disposed in the loop groove and fitted onto the bushing, the webbing passing through the opening and wrapped around the bushing in multiple turns; A shaft assembly, one end of which is rotatably inserted through a first shaft hole and forms a mounting portion at the end, the middle of which is tightly fitted through a bushing, and the other end of which is rotatably inserted through a second shaft hole; A braking assembly, pivotally connected to at least two pawl blocks at the mounting portion, the at least two pawl blocks being arranged around the axis; when the rotational speed of the braking assembly exceeds a predetermined speed, the at least two pawl blocks swing outward due to centrifugal force; at least one brake ratchet is coupled to the bracket, the at least one brake ratchet being positioned to engage with the at least two pawl blocks when they swing outward; and A spiral spring having two ends, one end of which is connected to the end of the shaft assembly that extends through the second shaft hole, and the other end of the spiral spring is connected to the bracket.

2. The webbing fall arrestor as described in claim 1, wherein, The portion of the webbing adjacent to the collar is sewn together to form a double-layer section; a recess is formed on the outer circumferential surface of the liner adjacent to the opening, and the portion of the double-layer section near the bushing is located in the recess.

3. The webbing fall arrestor as described in claim 1, wherein, A collar is fitted into the first shaft hole; the shaft assembly includes a friction block, a mounting plate, and a rotating shaft; the friction block is a cylinder and is tightly fitted into the bushing, and a rotating shaft hole is formed at the center of the friction block; a disc portion is provided in the middle of the mounting plate, the disc portion is rotatably fitted into the collar and connected to the friction block, the mounting portion is a ring and its inner periphery is integrally connected to the outer periphery of the disc portion; the center line of the rotating shaft is coaxial with the axis and is tightly fitted into the rotating shaft hole, and one end of the rotating shaft corresponding to the second shaft hole protrudes from the second shaft hole; one end of the spiral spring is connected to the end of the rotating shaft protruding from the second shaft hole.

4. The webbing fall arrestor as described in claim 3, wherein, The bracket includes a first side plate, a second side plate, and a connecting plate; the first side plate and the second side plate are disposed opposite to each other, and the first shaft hole and the second shaft hole are respectively formed in the first side plate and the second side plate; the connecting plate connects the first side plate and the second side plate; the webbing hub is disposed between the first side plate and the second side plate; the mounting part of the mounting plate is located on the outside of the first side plate.

5. The webbing fall arrestor as described in claim 4, wherein, The at least two pawl blocks are pivotally connected to the mounting part at one end, and the other end of each pawl block forms a ratchet portion. A spring is connected between each pawl block and the mounting part. The at least one brake ratchet is a metal block and is screwed onto the outer side of the first side plate. The at least one brake ratchet forms a locking protrusion on the side facing the mounting plate for each ratchet portion to engage.

6. The webbing fall arrestor as described in claim 5, wherein, A side cover is fixed to the outer side of the second side plate. The inner circumferential surface of the side cover forms a slot and a spiral spring chamber is formed inside. The spiral spring is accommodated in the spiral spring chamber, and the other end of the spiral spring is fixed to the slot, so that the spiral spring is indirectly connected to the bracket.

7. The webbing fall arrestor as described in claim 1, wherein, A flange is connected to the periphery of one end of the bushing, and a plurality of protrusions are connected to the flange. The plurality of protrusions are arranged around the bushing, and the bushing, the flange, and the plurality of protrusions are integrally connected metal structures. The bushing is a C-shaped plastic ring that covers the plurality of protrusions and is supported by the plurality of protrusions. The first lateral ring and the second lateral ring are coaxially connected to both sides of the bushing.

8. The webbing fall arrestor as described in claim 7, wherein, The inner circumference of the bushing covers the plurality of protrusions, and the outer circumference of the bushing has a plurality of mid-section through holes; a plurality of first side holes are formed on the inner circumference of the first lateral ring, the plurality of first side holes are arranged around the axis and are respectively connected to one end of the plurality of mid-section through holes; a plurality of second side holes are formed on the inner circumference of the second lateral ring, the plurality of second side holes are arranged around the axis and are respectively connected to the other end of the plurality of mid-section through holes; a fixing member is inserted through each first side hole, each mid-section through hole and each second side hole to connect the first lateral ring, the second lateral ring and the central cylinder.

9. The webbing fall arrestor as described in claim 8, wherein, Two positioning pins are connected to the side of the bushing opposite to the flange; two positioning holes are formed on the inner circumference of the first lateral ring, and the two positioning holes are respectively fitted onto the two positioning pins; a positioning ring is formed on the surface of the flange opposite to the plurality of protrusions, and the center line of the positioning ring is coaxial with the axis; the second lateral ring fits onto the positioning ring.

10. The webbing fall arrestor as described in claim 8, wherein, The peripheral wall of each of the aforementioned mid-section perforations is C-shaped and has a notch on the outer side.

11. The webbing fall arrestor as described in claim 8, wherein, Each of the first side holes is a screw hole; each of the second side holes is a countersunk hole; each of the fasteners is a bolt, and each of the fasteners passes through each of the second side holes and each of the middle through holes and is locked to each of the first side holes for fixation.

12. A webbing hub for a webbing fall arrestor, comprising a central cylinder, a first lateral ring, and a second lateral ring, wherein: The central cylinder includes a bushing and a bushing. The bushing is coaxially arranged around the outside of the bushing, and a ring groove is formed between the bushing and the bushing. An opening is formed on one side of the bushing, and the ring groove communicates with the opening. The first lateral ring and the second lateral ring are coaxially connected to both sides of the central cylinder, and at least one of the first lateral ring and the second lateral ring is detachably connected to the central cylinder.

13. The webbing hub of the webbing fall arrester as described in claim 12, wherein, A recess is formed on the outer peripheral surface of the bushing adjacent to the opening.

14. The webbing hub of the webbing fall arrester as described in claim 12, wherein, A flange is connected to the periphery of one end of the bushing, and a plurality of protrusions are connected to the flange. The plurality of protrusions are arranged around the bushing, and the bushing, the flange, and the plurality of protrusions are integrally connected metal structures. The bushing is a C-shaped plastic ring that covers the plurality of protrusions and is supported by the plurality of protrusions. The first lateral ring and the second lateral ring are coaxially connected to both sides of the bushing.

15. The webbing hub of the webbing fall arrester as described in claim 14, wherein, A centerline is defined with the centerline of the bushing; the inner circumference of the bushing covers the plurality of protrusions, and the outer circumference of the bushing has a plurality of mid-section through holes; a plurality of first side holes are formed on the inner circumference of the first lateral ring, the plurality of first side holes are arranged around the centerline and are respectively connected to one end of the plurality of mid-section through holes; a plurality of second side holes are formed on the inner circumference of the second lateral ring, the plurality of second side holes are arranged around the centerline and are respectively connected to the other end of the plurality of mid-section through holes; a fixing member is inserted through each first side hole, each mid-section through hole and each second side hole to connect the first lateral ring, the second lateral ring and the central cylinder.

16. The webbing hub of the webbing fall arrester as described in claim 15, wherein, Two positioning pins are connected to the side of the bushing opposite to the flange; two positioning holes are formed on the inner circumference of the first lateral ring, and the two positioning holes are respectively fitted onto the two positioning pins; a positioning ring is formed on the surface of the flange opposite to the plurality of protrusions, and the center line of the positioning ring is coaxial with the axis; the second lateral ring fits onto the positioning ring.

17. The webbing hub of the webbing fall arrester as described in claim 15, wherein, The peripheral wall of each of the aforementioned mid-section perforations is C-shaped and has a notch on the outer side.

18. The webbing hub of the webbing fall arrester as described in claim 15, wherein, Each of the first side holes is a screw hole; each of the second side holes is a countersunk hole; each of the fasteners is a bolt, and each of the fasteners passes through each of the second side holes and each of the middle through holes and is locked to each of the first side holes for fixation.

19. The webbing hub of the webbing fall arrester as described in claim 15, wherein, Each of the first lateral rings is a plastic ring or a metal ring; each of the second lateral rings is a plastic ring or a metal ring.

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