Webbing fall arrestor and its webbing hub

Abstract

A webbing fall arrestor has a webbing hub between two shaft holes of a bracket. The webbing hub includes 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 wrapped around the bushing are connected to the central cylinder. A shaft assembly is tightly fitted through the bushing. Its two ends are rotatably inserted through the two shaft holes, and two pawl blocks are pivotally connected to the mounting part at one end. A brake ratchet is connected 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 that at least one lateral ring can be separated from the central cylinder, the lateral ring does not need to be injection molded together with the central cylinder during manufacturing, thus avoiding the defect of warping on the outer periphery of the lateral ring.

Claims

1. A webbing fall arrestor, comprising: 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 center 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 center line of the bushing is coaxial with the center line, the bushing is coaxially disposed around the outside of the bushing, a set of annular grooves is formed between the bushing and the bushing, an opening is formed on one side of the bushing, the set of annular grooves communicates with the opening, and a recess is formed on the outer circumferential surface of the bushing adjacent to the opening; the first lateral ring and the second lateral ring are respectively coaxially connected to the two 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; the portion of the webbing adjacent to the loop is sewn to form a double-layered section, the portion of the double-layered section near the bushing being disposed in the recess; a shaft assembly, one end of which is rotatably inserted through the first shaft hole and forms a mounting portion at that end, the middle of which is tightly fitted into the bushing, and the other end of which is rotatably inserted through the second shaft hole; A braking assembly is 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 located at a position that can engage with the at least two pawl blocks when they swing outward; and a spiral spring having two ends, one end of which is coupled to the end of the shaft assembly that extends through the second shaft hole, the other end of the spiral spring being connected to the bracket.

2. A webbing fall arrestor, comprising: A bracket, with a first shaft hole and a second shaft hole on opposite sides, and a centerline defined by the line connecting the centers of the first shaft hole and the second shaft hole; a webbing hub, disposed within the bracket, including 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 centerline, 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 being coaxially connected to the two sides of the central cylinder, and at least one of the first lateral ring and the second lateral ring being detachably connected to the central cylinder; a webbing, one end of which forms a ring, the ring being disposed in the ring 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 the first shaft hole and forms a mounting portion at that end, the middle of which is tightly fitted through the bushing, and the other end of which is rotatably inserted through the second shaft hole; a braking assembly, at least two pawl blocks pivotally connected to 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 located at a position where it can engage with the at least two pawl blocks when they swing outward; and a spiral spring having two ends, one end of which is coupled to the end of the shaft assembly that extends through the second shaft hole, and the other end of the spiral spring being connected to the bracket; 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 cylindrical body and is tightly fitted into the bushing, with a rotating shaft hole formed at the center of the friction block; the mounting plate has a disc portion in the middle, which is rotatably fitted into the collar and connected to the friction block, and the mounting portion is a ring body with its inner periphery integrally connected to the outer periphery of the disc portion; the center line of the rotating shaft is coaxial with the shaft center line and is tightly fitted into the rotating shaft hole, with one end of the rotating shaft corresponding to the second shaft hole extending out of the second shaft hole; one end of the spiral spring is connected to the end of the rotating shaft extending out of the second shaft hole.

3. The webbing fall arrester as claimed in claim 2, 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; and the mounting part is located on the outside of the first side plate.

4. The webbing fall arrestor as described in claim 3, wherein at least two pawl blocks are pivotally connected to the mounting portion at one end, and the other end of each pawl block forms a ratchet portion, and a spring is connected between each pawl block and the mounting portion; the at least one brake ratchet is a metal block and screwed onto the outer side of the first side plate, and the at least one brake ratchet forms a locking protrusion on the side facing the mounting disc for engagement of each ratchet portion.

5. The webbing fall arrestor as claimed in claim 4, 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 slot; the spiral spring is received 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.

6. A webbing fall arrestor, comprising: A bracket, with a first shaft hole and a second shaft hole on opposite sides, and a centerline defined by the line connecting the centers of the first shaft hole and the second shaft hole; a webbing hub, disposed within the bracket, including 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 centerline, 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; a webbing, one end of which forms a ring, the ring being disposed in the ring 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 the first shaft hole and forms a mounting portion at that end, the middle of which is tightly fitted through the bushing, and the other end of which is rotatably inserted through the second shaft hole; a braking assembly, at least two pawl blocks pivotally connected to 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 located at a position where it can engage with the at least two pawl blocks when they swing outward; and a spiral spring having two ends, one end of which is coupled to the end of the shaft assembly that extends through the second shaft hole, and the other end of the spiral spring being connected to the bracket; The bushing has a flange connected to the periphery of one end, and a plurality of protrusions connected to the flange. The protrusions are arranged around the bushing, and the bushing, the flange, and the protrusions are integrally connected metal structures. The bushing is a C-shaped plastic ring that covers the protrusions and is supported by the protrusions. The first lateral ring and the second lateral ring are coaxially connected to both sides of the bushing. At least one of the first lateral ring and the second lateral ring is detachably connected to the bushing.

7. The webbing fall arrester as claimed in claim 6, wherein the inner circumferential side of the bushing covers the protrusions, and a plurality of intermediate through holes are provided on the outer circumferential side of the bushing; a plurality of first side holes are formed on the inner circumferential side of the first lateral ring, the first side holes being arranged around the axis and communicating with one end of the intermediate through holes respectively; a plurality of second side holes are formed on the inner circumferential side of the second lateral ring, the second side holes being arranged around the axis and communicating with the other end of the intermediate through holes respectively; and a fastener is inserted through each of the first side holes, each of the intermediate through holes and each of the second side holes to connect the first lateral ring, the second lateral ring and the central cylinder.

8. The webbing fall arrestor as claimed in claim 7, wherein two positioning pins are connected to the side of the bushing opposite to the flange; two positioning holes are formed on the inner circumferential side of the first lateral ring, the two positioning holes respectively fitting onto the two positioning pins; a positioning ring is formed on the surface of the flange opposite to the protrusions, the center line of the positioning ring being coaxial with the axis; and the second lateral ring fitting onto the positioning ring.

9. The webbing fall arrestor as claimed in claim 7, wherein the peripheral wall of each of the middle perforations is C-shaped and forms a notch on the outer side.

10. The webbing fall arrestor as claimed in claim 7, 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.

11. 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 disposed around the outside of the bushing, and an annular groove is formed between the bushing and the bushing. An opening is formed on one side of the bushing, and the annular groove communicates with the opening. A recess is formed on the outer circumferential surface of the bushing adjacent to the opening. A first lateral ring and a 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.

12. A webbing hub for a webbing fall arrestor, comprising a central cylinder, a first lateral ring, and a second lateral ring; the central cylinder includes a bushing and a bushing, the bushing being coaxially disposed around the outside of the bushing, forming an annular groove between the bushing and the bushing, and an opening being formed on one side of the bushing, the annular groove communicating with the opening; 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 protrusions are arranged around the bushing, and the bushing, the flange, and the protrusions are integrally connected metal structures. The bushing is a C-shaped plastic ring that covers the protrusions and is supported by the protrusions. The first lateral ring and the second lateral ring are coaxially connected to both sides of the bushing, and at least one of the first lateral ring and the second lateral ring is detachably connected to the bushing.

13. The webbing hub of the webbing fall arrester as claimed in claim 12, wherein a centerline is defined by the centerline of the bushing; the inner circumferential side of the bushing covers the protrusions, and a plurality of intermediate through holes are provided on the outer circumferential side of the bushing; a plurality of first side holes are formed on the inner circumferential side of the first lateral ring, the first side holes being arranged around the centerline and communicating with one end of each of the intermediate through holes; a plurality of second side holes are formed on the inner circumferential side of the second lateral ring, the second side holes being arranged around the centerline and communicating with the other end of each of the intermediate through holes; a fastener is inserted through each of the first side holes, each of the intermediate through holes and each of the second side holes to connect the first lateral ring, the second lateral ring and the central cylinder.

14. The webbing hub of the webbing fall arrester as claimed in claim 13, wherein two positioning pins are connected to the side of the bushing opposite to the flange; two positioning holes are formed on the inner circumferential side of the first lateral ring, the two positioning holes respectively fitting onto the two positioning pins; a positioning ring is formed on the surface of the flange opposite to the protrusions, the center line of the positioning ring being coaxial with the axis; and the second lateral ring fitting onto the positioning ring.

15. The webbing hub of the webbing fall arrester as claimed in claim 13, wherein the peripheral wall of each of the intermediate perforations is C-shaped and forms a notch on the outer side.

16. The webbing hub of the webbing fall arrester as claimed in claim 13, 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.

17. The webbing hub of the webbing fall arrester as claimed in claim 13, wherein the first lateral ring is a plastic ring or a metal ring; and the second lateral ring is a plastic ring or a metal ring.

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