Waterproof fall arrestor

Abstract

A waterproof fall arrestor includes an outer shell, with a central partition dividing the space inside the shell into two cavities. Sealed side covers are attached to both sides of the shell. A rope outlet communicating with one of the cavities is located around the outer shell. A main shaft passes through a shaft hole in the central partition, and a hub is fitted onto the main shaft. The hub is located in one of the cavities and a rope extending beyond the rope outlet is wound around it. A spiral spring and a mounting disc are located in the other cavity. The two ends of the spiral spring are connected to the main shaft and the outer shell, respectively. The mounting disc is fitted onto the main shaft and has a braking device for engaging with a braking structure in the same cavity during high-speed rotation. This invention, through the sealed design of the outer shell, places the spiral spring and other structures in a cavity that is not directly connected to the rope outlet. Combined with the waterproof design of the outer shell, this prevents the internal structures from rusting or affecting their operation due to liquid infiltration.

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 waterproof fall arrestor. Background Technology

[0002] Existing fall arresters involve fixing the outer casing to one location and attaching one end of the rope, which extends out of the casing, to a harness worn by the person. When a person wearing the harness falls from the air, pulling the rope causes a hub inside the fall arrester to rotate rapidly. The hub's braking mechanism engages with a brake structure fixed inside the casing, preventing the hub from continuing to rotate and releasing the rope. This prevents the person from falling further, achieving a fall arrest safety effect.

[0003] For the aforementioned fall arresters to function effectively, their internal mechanical structure must function smoothly. However, most fall arresters lack waterproofing and have no internal compartments. This means that when the fall arrester is exposed to rain or splashed with water, water carried into the shell by the rope or seeping through gaps can damage the internal mechanical structure. This can cause the internal components, especially the braking system, to rust or become obstructed by liquid, posing a safety hazard. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a waterproof fall arrestor, which has a sealed structure around the periphery of the outer shell and a chamber inside the outer shell that is not directly connected to the rope outlet. A braking component and a braking structure are installed in this chamber to prevent the braking component and braking structure from rusting or failing due to liquid obstruction, and to ensure that the waterproof fall arrestor can still be reliably activated and achieve the safety effect of fall arrest in various humid environments.

[0005] To achieve the above objectives, this utility model provides a waterproof fall arrestor, comprising an outer shell and a fall arrestor body. The outer shell includes an outer shell body, a first side cover, a first sealing ring, a second side cover, a second sealing ring, and a braking structure. The outer shell body includes a cylindrical body and a central partition. The cylindrical body has a central axis and a rope outlet around its perimeter. The central partition is connected to the cylindrical body and divides the internal space of the cylindrical body into a first cavity and a second cavity. The first cavity communicates with the rope outlet. The central partition has a shaft hole centered on the central axis. The periphery of the first side cover is coupled to the end edge of the cylindrical body corresponding to the first cavity. The first sealing ring is sandwiched between the end edge of the cylindrical body corresponding to the first cavity and the periphery of the first side cover. The periphery of the second side cover is coupled to the end edge of the cylindrical body corresponding to the second cavity. The second sealing ring is sandwiched between the end edge of the cylindrical body corresponding to the second cavity and the periphery of the second side cover. The braking structure is fixed within the second cavity and has at least one brake ratchet.

[0006] The fall arrestor body includes a main shaft, a hub, a rope, a spiral spring, a mounting disc, and a braking assembly. The middle portion of the main shaft is rotatably inserted through the shaft hole, and the centerline of the main shaft is coaxial with the axis. The main shaft includes a first section and a second section, located in the first cavity and the second cavity, respectively. The hub is fitted onto the first section. One end of the rope is connected to the hub and wound around the hub in multiple turns, while the other end of the rope extends out of the rope outlet. One end of the spiral spring is connected to the second section, and the other end is connected to the outer shell body. The mounting disc is fitted onto the second section. The braking assembly is connected to the mounting disc and includes at least two pawl blocks arranged around the axis. When the rotational speed of the braking assembly exceeds a predetermined speed, at least one of the at least two pawl blocks engages with at least one brake ratchet.

[0007] The advantage of this invention is that the first and second sealing rings prevent liquid from seeping into the gaps on both sides of the outer shell. Furthermore, the second cavity separated by the partition plate within the cylinder is not directly connected to the rope outlet, preventing external liquids or moisture from directly entering the second cavity through the rope outlet. By placing the braking structure and braking assembly within the second cavity, the braking structure and assembly are prevented from rusting due to moisture or failing due to liquid obstruction, ensuring that the waterproof fall arrestor of this invention can reliably activate and achieve a fall-prevention safety effect in various humid environments. Attached Figure Description

[0008] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0009] Figure 2 This is an exploded view of the preferred embodiment of the present invention.

[0010] Figure 3 for Figure 2 The left side view of the outer shell body.

[0011] Figure 4 This is another exploded view of the preferred embodiment of the present invention.

[0012] Figure 5 for Figure 4 The right side view of the outer shell body.

[0013] Figure 6 for Figure 4 An exploded view of the brake disc.

[0014] Figure 7 for Figure 1 Top view.

[0015] Figure 8 for Figure 7 A cross-sectional view along the 8-8 direction.

[0016] Figure 9 for Figure 7 A cross-sectional view along the 9-9 direction.

[0017] Figure 10 for Figure 7 A cross-sectional view along the 10-10 direction.

[0018] Explanation of reference numerals in the attached figures

[0019] 100: Waterproof fall arrestor

[0020] 10: Outer shell

[0021] 11: Second sealing ring

[0022] 111: Perforation of the second sealing ring

[0023] 12: Outer shell

[0024] 121: Cylinder

[0025] 1211: Rope exit notch

[0026] 1212: First annular surface

[0027] 1213: First screw hole

[0028] 1214: Second annular surface

[0029] 1215: Second screw hole

[0030] 1216: Socket

[0031] 122: Middle partition

[0032] 1221: Shaft hole

[0033] 123: Central bearing housing

[0034] 124: Scroll Spring Seat

[0035] 1241: Slot

[0036] 1242: Socket

[0037] 125: Cover plate

[0038] 1251: Cover plate perforation

[0039] 126: Lifting Ring Structure

[0040] 1261: Hanging ring seat

[0041] 1262: Rings

[0042] 127: Grip

[0043] 128: Central bearing

[0044] 129: Mechanical oil seal

[0045] 13: Brake structure

[0046] 14: First side cover

[0047] 141: First side cover annular surface

[0048] 142: First side cover perforation

[0049] 143: First screw

[0050] 15: Bracket

[0051] 151: Bracket perforation

[0052] 16: First sealing ring

[0053] 161: Perforation of the first sealing ring

[0054] 17: Brake disc

[0055] 171: Shaft element

[0056] 1711: Shaft

[0057] 1712: Chassis

[0058] 1713: Through hole

[0059] 172: Ratchet Ring

[0060] 1721: Brake Ratchet

[0061] 173: Fixing ring

[0062] 174: Disc Spring

[0063] 175: Brake pads

[0064] 18: Second side cover

[0065] 181: Second side cover annular surface

[0066] 182: Second side cover perforation

[0067] 183: Second screw

[0068] 184: Outer bearing housing

[0069] 185: Outer bearing

[0070] 20: Fall arrestor body

[0071] 21: Installation panel

[0072] 22: Spindle

[0073] 221: First paragraph

[0074] 222: Second paragraph

[0075] 23: Braking components

[0076] 231: Ratchet Block

[0077] 2311: Ratchet

[0078] 2312: Center of gravity

[0079] 2313: Roller

[0080] 232: Counterweight Spring

[0081] 24: Hub

[0082] 241: Hub shaft hole

[0083] 242: Rope Groove

[0084] 26: Rope body

[0085] 28: Spiral Spring

[0086] A: Rope exit

[0087] B: Brush Unit

[0088] L: Centerline

[0089] L1: First direction

[0090] L2: Second direction

[0091] S1: First Cavity

[0092] S2: Second cavity Detailed Implementation

[0093] 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 waterproof fall arrestor 100 of this utility model includes a housing 10 and a fall arrestor body 20, wherein:

[0094] Please refer to Figures 1 to 5 As shown, the outer casing 10 includes an outer casing body 12, a first side cover 14, a first sealing ring 16, a second side cover 18, a second sealing ring 11, and a brake structure 13. The outer casing body 12 includes a cylindrical body 121, a central partition 122, a central bearing seat 123, a spiral spring seat 124, a cover plate 125, a lifting ring structure 126, and a handle 127.

[0095] The cylindrical body 121 is cylindrical in shape and has a central axis L defined at its center. Two opposite directions along the central axis L are defined as a first direction L1 and a second direction L2. A rope outlet recess 1211 is formed at the end edge of the cylindrical body 121 corresponding to the first direction L1, and it is laterally open to the outside. In this preferred embodiment, the rope outlet recess 1211 is located on the lower side around the cylindrical body 121. A first annular surface 1212 is formed at the end edge of the cylindrical body 121 corresponding to the first direction L1. The first annular surface 1212 has a plurality of first screw holes 1213, which are arranged at intervals around the central axis L. A second annular surface 1214 is formed at the end edge of the cylinder 121 corresponding to the second direction L2. The second annular surface 1214 has a plurality of second screw holes 1215, and the plurality of second screw holes 1215 are arranged at intervals around the axis L. A pair of grooves 1216 are formed on opposite sides of the inner circumference of the second annular surface 1214.

[0096] The periphery of the partition plate 122 is connected to the middle of the inner circumferential surface of the cylinder. The partition plate 122 divides the space inside the cylinder 121 into a first cavity S1 and a second cavity S2. The first cavity S1 is located inside the cylinder 121 on one side corresponding to the first direction L1 and communicates with the rope outlet recess 1211. The second cavity S2 is located inside the cylinder 121 on the other side corresponding to the second direction L2. The partition plate 122 has a shaft hole 1221 centered on the axis L in the middle. The intermediate bearing seat 123 is an annular body and is connected to the partition plate 122 on one side adjacent to the first cavity S1. The intermediate bearing seat 123 surrounds the shaft hole 1221 and is coaxial with the shaft hole 1221 along the axis L. An intermediate bearing 128 and a mechanical oil seal 129 are respectively embedded in the intermediate bearing seat 123 on both sides corresponding to the first direction L1 and the second direction L2.

[0097] The scroll spring seat 124 is an annular body and is connected to the middle partition plate 122 on one side adjacent to the second cavity S2. The diameter of the scroll spring seat 124 is larger than the diameter of the middle bearing seat 123. The scroll spring seat 124 and the shaft hole 1221 are coaxial along the axis L. A slot 1241 is formed at the end edge of the scroll spring seat 124, and the slot 1241 has a socket 1242 on its circumference, which is formed on the inner circumferential surface of the scroll spring seat 124. The cover plate 125 is a circular plate, and the periphery of the cover plate 125 is screwed to the end edge of the scroll spring seat 124. The periphery of the cover plate 125 covers the slot 1241 and the cover plate 125 encloses the internal space of the scroll spring seat 124. A cover plate through hole 1251 is formed in the center of the cover plate 125, and the cover plate through hole 1251 and the shaft hole 1221 are coaxial along the axis L. The lifting ring structure 126 includes a lifting ring seat 1261 and a lifting ring 1262. The lifting ring seat 1261 is connected to the upper surface of the cylinder 121, and the lifting ring 1262 is attached to the lifting ring seat 1261. The handle 127 is attached to the rear surface of the cylinder 121.

[0098] The first side cover 14 is a circular plate, and its periphery is screwed to the end edge of the cylinder 121 corresponding to the first cavity S1. For details, please refer to... Figure 2 , Figure 3 and Figure 8As shown, the periphery of the first side cover 14 forms a first side cover annular surface 141. The first side cover annular surface 141 has a plurality of first side cover through holes 142. The plurality of first side cover through holes 142 are directly opposite the plurality of first screw holes 1213. A first screw 143 is inserted through each first side cover through hole 142 and screwed into each first screw hole 1213. The periphery of the first side cover 14 closes the laterally open portion of the rope outlet recess 1211, thereby forming a rope outlet A at the rope outlet recess 1211. The rope outlet A is located on one side of the cylinder 121 corresponding to the first direction L1, and the rope outlet A communicates with the first cavity S1. A brush unit B is embedded in the rope outlet A.

[0099] The first sealing ring 16 is a rubber ring with the same shape as the first side cover annular surface 141. The first sealing ring 16 is sandwiched between the first annular surface 1212 and the first side cover annular surface 141. The first sealing ring 16 has a plurality of first sealing ring through holes 161. Each first sealing ring through hole 161 is connected between each first side cover through hole 142 and each first screw hole 1213. Each first screw 143 passes through each first sealing ring through hole 161.

[0100] The second side cover 18 is a circular plate. The periphery of the second side cover 18 is screwed onto the end edge of the cylinder 121 corresponding to the second cavity S2. The periphery of the second side cover 18 covers the mating groove 1216. For details, please refer to... Figures 4 to 6 and Figure 8 As shown, a second side cover 18 forms a second side cover annular surface 181 around its periphery. The second side cover annular surface 181 has a plurality of second side cover through holes 182, which are directly opposite to the plurality of second screw holes 1215. A second screw 183 is inserted through each second side cover through hole 182 and screwed into each second screw hole 1215. An outer bearing seat 184 is formed on the side of the second side cover 18 facing the second cavity S2, and an outer bearing 185 is embedded in the outer bearing seat 184.

[0101] The second sealing ring 11 is a rubber ring with the same shape as the second side cover annular surface 181. The second sealing ring 11 is sandwiched between the second annular surface 1214 and the second side cover annular surface 181. The second sealing ring 11 has a plurality of second sealing ring through holes 111. Each second sealing ring through hole 111 is connected between each second side cover through hole 182 and each second screw hole 1215. Each second screw 183 passes through each second sealing ring through hole 111.

[0102] The brake structure 13 includes a bracket 15 and a brake disc 17. The bracket 15 has two ends and a bracket through hole 151 formed in the middle. The two ends of the bracket 15 are fixedly embedded in the mating groove 1216, so that the brake structure 13 is fixed in the second cavity S2. The brake disc 17 includes a shaft element 171, a ratchet ring 172, a fixing ring 173, a disc spring 174, and a brake pad 175. The shaft element 171 includes a shaft 1711 and a base 1712. The shaft 1711 has a through hole 1713 at its axial center. One end of the shaft 1711 is fixed to the middle of the bracket 15 by a screw. The through hole 1713 and the bracket through hole 151 are coaxial along the axis L and communicate with each other. The base 1712 is an annular body and its inner periphery is connected to the outer periphery of the other end of the shaft 1711. The ratchet ring 172 is an annular body and is rotatably fitted onto the shaft 1711. A plurality of brake ratchet teeth 1721 are arranged around the axis L. The retaining ring 173 is a hexagonal ring and is detachably fitted onto the shaft 1711. The disc spring 174 is fitted onto the shaft 1711 and is in a compressed state, sandwiched between the retaining ring 173 and the ratchet ring 172. The brake pad 175 is a ring and fitted onto the shaft 1711. The brake pad 175 is sandwiched between the retaining ring 173 and the chassis 1712. The disc spring 174 applies a force to the ratchet ring 172 and the chassis 1712 to clamp the brake pad 175, so that the rotation of the ratchet ring 172 relative to the shaft 1711 is braked by the brake pad 175.

[0103] Please refer to Figure 2 , Figure 4 and Figures 6 to 10 As shown, the fall arrestor body 20 includes a main shaft 22, a hub 24, a rope 26, a spiral spring 28, a mounting disc 21, and a braking assembly 23. The main shaft 22 is a rod with its center line coaxial with the axis L. The main shaft 22 includes a first section 221 and a second section 222. The main shaft 22 is pivotally mounted on the central bearing 128 at its middle portion located between the first section 221 and the second section 222, so that the main shaft 22 can rotatably pass through the shaft hole 1221. The middle portion of the main shaft 22 forms a sealed fit with the central bearing 128 by passing through the mechanical oil seal 129. The first section 221 and the second section 222 are located in the first cavity S1 and the second cavity S2, respectively. The second section 222 is rotatably mounted through the cover plate through hole 1251, and the outer end of the second section 222 is pivotally mounted on the outer bearing 185.

[0104] The hub 24 has a hub shaft hole 241 at its center, which is used to secure the first section 221 of the main shaft 22. A rope groove 242 surrounds the hub 24. The rope 26 has two ends, one end of which is attached to the hub 24. The rope 26 is housed within the rope groove 242 and wound multiple times around the hub 24. The other end of the rope 26 passes through the brush unit B and exits outward from the rope outlet A of the housing 10. The spiral spring 28 has two ends and is disposed within the spiral spring seat 124. One end of the spiral spring 28 is attached to the second section 222 of the main shaft 22, and the other end passes through the insertion port 1242 and is inserted into the slot 1241 for fixation, thus attaching the other end of the spiral spring 28 to the housing body 12.

[0105] The mounting disc 21 is a disc body and is fitted onto the second segment 222 of the main shaft 22. In this preferred embodiment, the mounting disc 21 is located between the cover plate 125 and the brake structure 13. The brake assembly 23 includes two pawl blocks 231, which are rotatably pivotally connected to the side of the mounting disc 21 facing the brake structure 13. Specifically, the pawl blocks 231 are located around the mounting disc 21, and the two pawl blocks 231 are arranged around the axis L. Each of the pawl blocks 231 has a ratchet portion 2311 at one end and a center of gravity portion 2312 at the other end. A roller 2313 is attached to each center of gravity portion 2312. A counterweight spring 232 is connected between each center of gravity portion 2312 and the mounting disc 21. The ratchet ring 172 and the plurality of brake ratchet teeth 1721 of the brake disc 17 are located inside the two pawl blocks 231, so that the plurality of brake ratchet teeth 1721 of the brake disc 17 can be engaged by the ratchet portion 2311 of each pawl block 231. When the waterproof fall arrestor 100 is stationary, the roller 2313 of each of the two pawl blocks 231 rests against the tooth surface of the plurality of brake ratchet teeth 1721.

[0106] When the rope 26 is pulled outward from the rope outlet A by an external force, causing the rope 26 to drive the hub 24 to rotate together, the hub 24 is connected to the mounting plate 21 by the main shaft 22, causing the mounting plate 21 to also rotate, which in turn causes the braking assembly 23 to rotate. At this time, the rollers 2313 of each of the two pawl blocks 231 will roll or slide along the tooth surfaces of the plurality of brake ratchet teeth 1721. When the hub 24 rotates slowly, each roller 2313 can remain in a state of sliding or rolling along the tooth surfaces of the plurality of brake ratchet teeth 1721. However, when the rope 26 is pulled outward rapidly by an external force, causing the two pawl blocks 231 of the braking assembly 23 to rotate at a speed exceeding a predetermined speed as the hub 24 rotates, the collision between each roller 2313 and the plurality of brake ratchet teeth 1721 will cause each pawl block 231 to rotate and cause each ratchet tooth portion 2311 to mesh with the corresponding brake ratchet tooth 1721. At this time, the brake disc 17 generates a braking effect on the rotation of the hub 24 through the braking assembly 23, the mounting disc 21 and the main shaft 22, slowing down the speed at which the rope 26 is released outward from the hub 24 until it stops.

[0107] In addition to the preferred embodiment described above, the brake disc 17 can also be configured with only one brake ratchet connected to the bracket 15, except that one end of the shaft 1711 is attached to the middle of the bracket 15. The position of this single brake ratchet is such that when the rotational speed of the two pawl blocks 231 as the hub 24 rotates exceeds the predetermined speed, it can be engaged by the ratchet portion 2311 of either pawl block 231. The brake assembly 23 can be pivotally connected to the mounting disc 21 with one or more pawl blocks 231, in addition to having two.

[0108] Furthermore, in addition to the preferred embodiment described above, where the two pawl blocks 231 of the braking assembly 23 are designed such that when the rotational speed of the hub 24 exceeds the predetermined speed, each pawl block 231 rotates inward due to the collision between each roller 2313 and the plurality of brake ratchet teeth 1721, the ratchet teeth 2311 of each pawl block 231 may also be designed without each weight. The structure of the core 2312 and each of the rollers 2313 is such that the pawl block without a center of gravity is configured such that one end is pivotally connected to the mounting plate 21 and when the pawl block is subjected to a large centrifugal force, one end of each of the pawl blocks with ratchet teeth will be thrown outward. In this case, the brake disc 17 of the braking assembly 23 can be configured as a ratchet ring fixed to the bracket 15. The multiple brake ratchet teeth on the ratchet ring can be engaged when the ratchet teeth 2311 of each of the pawl blocks 231 are thrown out. Alternatively, the braking assembly 23 can be configured to include a structure of multiple brake ratchet teeth, which are arranged around the axis L and formed on the side of the second side cover 18 facing the second cavity S2, for engagement when the ratchet teeth 2311 of each of the pawl blocks 231 are thrown out.

[0109] 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 waterproof fall arrestor, characterized in that, include: An outer casing includes an outer casing body, a first side cover, a first sealing ring, a second side cover, a second sealing ring, and a braking structure. The outer casing body includes a cylindrical body and a central partition. The cylindrical body has a central axis and a rope outlet around its perimeter. The central partition is connected to the cylindrical body and divides the space inside the cylindrical body into a first cavity and a second cavity. The first cavity communicates with the rope outlet. The central partition has a shaft hole centered on the central axis. The periphery of the first side cover is engaged with the end edge of the cylindrical body corresponding to the first cavity. The first sealing ring is sandwiched between the end edge of the cylindrical body corresponding to the first cavity and the periphery of the first side cover. The periphery of the second side cover is engaged with the end edge of the cylindrical body corresponding to the second cavity. The second sealing ring is sandwiched between the end edge of the cylindrical body corresponding to the second cavity and the periphery of the second side cover. The braking structure is fixed in the second cavity and has at least one brake ratchet. as well as A fall arrestor body includes a main shaft, a hub, a rope, a spiral spring, a mounting disc, and a braking assembly. The middle portion of the main shaft is rotatably inserted through the shaft hole, and the centerline of the main shaft is coaxial with the axis. The main shaft includes a first section and a second section, located in the first cavity and the second cavity, respectively. The hub is fitted onto the first section. One end of the rope is connected to the hub and wound around the hub in multiple turns, while the other end of the rope extends out of the rope outlet. One end of the spiral spring is connected to the second section, and the other end is connected to the outer shell body. The mounting disc is fitted onto the second section. The braking assembly is connected to the mounting disc and includes at least two pawl blocks arranged around the axis. When the rotational speed of the braking assembly exceeds a predetermined speed, at least one of the at least two pawl blocks engages with at least one brake ratchet.

2. The waterproof fall arrestor as described in claim 1, wherein, A middle bearing housing is connected to the middle partition plate. The middle bearing housing surrounds the shaft hole and is coaxial with the shaft hole along the axis. A middle bearing is embedded in the middle bearing housing. The middle part of the main shaft is pivotally mounted on the middle bearing.

3. The waterproof fall arrestor as described in claim 2, wherein, A mechanical oil seal is embedded in the bearing housing, and the middle part of the main shaft passes through the mechanical oil seal to form a sealed fit.

4. The waterproof fall arrestor as described in claim 1, wherein, The outer casing includes a spiral spring seat, which is an annular body connected to the central partition. The spiral spring seat and the shaft hole are coaxial along the axis. A slot is formed at the end edge of the spiral spring seat, and the slot has a circumferential insertion port formed on the inner circumferential surface of the spiral spring seat. A cover plate is attached to the end edge of the spiral spring seat. The periphery of the cover plate covers the slot and the cover plate encloses the space inside the spiral spring seat. A cover plate through hole is formed in the center of the cover plate. The second section of the main shaft is rotatably inserted through the cover plate through hole. The spiral spring is disposed inside the spiral spring seat, and the other end of the spiral spring passes through the insertion port and is inserted into the slot for fixation.

5. The waterproof fall arrestor as described in claim 1, wherein, A first annular surface is formed at the end edge of the cylinder corresponding to the first cavity. The first annular surface has a plurality of first screw holes, which are arranged at intervals around the axis. A first side cover annular surface is formed around the periphery of the first side cover. The first side cover annular surface has a plurality of first side cover through holes, which are directly opposite the plurality of first screw holes. A first screw is inserted through each first side cover through hole, and each first screw is screwed into each first screw hole. The first sealing ring is sandwiched between the first annular surface and the first side cover annular surface.

6. The waterproof fall arrestor as described in claim 5, wherein, The shape of the first sealing ring is the same as the shape of the first annular surface. The first sealing ring has a plurality of first sealing ring through holes, each of which is connected between each of the first side cover through holes and each of the first screw holes; each of the first screws passes through each of the first sealing ring through holes.

7. The waterproof fall arrestor as described in claim 1, wherein, A second annular surface is formed at the end edge of the cylinder corresponding to the second cavity. The second annular surface has a plurality of second screw holes, which are arranged at intervals around the axis. A second side cover annular surface is formed around the periphery of the second side cover. The second side cover annular surface has a plurality of second side cover through holes, which are directly opposite the plurality of second screw holes. A second screw is inserted through each second side cover through hole, and each second screw is screwed into each second screw hole. A second sealing ring is sandwiched between the second annular surface and the second side cover annular surface.

8. The waterproof fall arrestor as described in claim 7, wherein, The shape of the second sealing ring is the same as that of the second annular surface. The second sealing ring has a plurality of second sealing ring through holes, each of which is connected between each of the second side cover through holes and each of the second screw holes; each of the second screws passes through each of the second sealing ring through holes.

9. The waterproof fall arrestor as described in claim 7, wherein, A pair of grooves are formed on opposite sides of the inner circumference of the second annular surface; the middle of each pawl block is rotatably pivotally connected to the periphery of the mounting plate, one end of each pawl block forms a ratchet tooth, and the other end forms a center of gravity, a roller is connected to each center of gravity, and a counterweight spring is connected between each center of gravity and the mounting plate; the brake structure includes a bracket and a brake disc; the bracket has two ends and a bracket through hole is formed in the middle, the two ends of the bracket are fixed in the pair of grooves; the brake disc has a shaft in the center, the shaft has a through hole at the axial position, one end of the shaft is fixed to the middle of the bracket, and the through hole and the bracket through hole are along the axial direction. The lines are coaxial, and the through hole communicates with the through hole of the bracket. The number of at least one brake ratchet teeth is multiple and they are arranged around the brake disc. The multiple brake ratchet teeth are arranged around the axis and located inside the at least two pawl blocks so that each ratchet tooth portion can engage. When the rotational speed of the braking assembly is lower than the predetermined speed, the rollers of each of the at least two pawl blocks roll or slide along the tooth surfaces of the multiple brake ratchet teeth. When the rotational speed of the braking assembly exceeds the predetermined speed, the ratchet portions of each of the at least two pawl blocks are driven to engage with the multiple brake ratchet teeth respectively. The second section of the main shaft is rotatably passed through the through hole and the through hole of the bracket.

10. The waterproof fall arrestor as described in claim 9, wherein, An outer bearing seat is formed in the middle of the second side cover facing the second cavity, and an outer bearing is embedded in the outer bearing seat; the outer end of the second section of the main shaft is pivotally mounted on the outer bearing.

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