A fall arrester

Abstract

The present invention provides a fall arrester comprising a back shell, a take-up reel disposed within the back shell, and a locking frame, a rotating ring, and a movable ring disposed sequentially on one side of the take-up reel. A pin hole and a pin rod are disposed between the locking frame and the rotating ring. When the take-up reel rotates too fast, the pin rod extends into the pin hole, causing the take-up reel and the rotating ring to rotate together. A spiral groove and a protrusion are disposed between the rotating ring and the movable ring. During rotation of the rotating ring, the movable ring moves axially, contacting a sealing cap to stop the entire transmission, thereby achieving a fall arrest effect. During the transmission process, a friction ring and an embracing member interact, and the friction between them reduces the take-up reel's rotation speed. The present invention reduces the release speed of the wire rope before stopping, thereby reducing the impulse experienced by the user.

Description

Technical Field

[0001] The present invention relates to the technical field of fall arresters, and in particular to a fall arrester. Background Art

[0002] A fall arrester, also known as a speed differential, is a protective device that can quickly brake and lock a falling object within a specified distance. It is suitable for cargo lifting, protecting the lives of ground operators and preventing damage to the workpiece being hoisted.

[0003] When using existing fall arresters, if the cable is released quickly, the arresting mechanism is triggered quickly. This creates a large impact on the user, causing their safety straps and other protective gear to tighten, causing discomfort. Furthermore, after the fall arrester is triggered, internal inspections should be performed to improve safety. Summary of the Invention

[0004] To address the above-mentioned issues, the present invention discloses a fall arrester comprising a back shell, wherein a fixed shaft is fixedly connected to the interior of the back shell, and a take-up wheel is rotatably connected to the fixed shaft, and a steel cable is gathered around the edge of the take-up wheel. A wire groove is provided on the outside of the take-up wheel, and the steel cable is wound in the groove. A groove is also provided on the inside of the take-up wheel.

[0005] A locking frame, a rotating ring, and a movable ring are sequentially provided on one side of the take-up wheel. The locking frame includes a support frame, and the support frame is fixedly connected to the take-up wheel. A plurality of support blocks are fixedly connected to the edge of the support frame. A pin rod is radially movable on the support block. The rotating ring includes a second ring body, and a pin hole is provided inside the second ring body, and the pin hole and the pin rod cooperate. That is, the locking frame rotates with the take-up wheel. When the take-up wheel rotates too fast, the pin rod extends radially, causing the pin rod to extend into the pin hole, and the rotating ring rotates with the take-up wheel.

[0006] The movable ring comprises a first ring body, which is sleeved onto the sidewall of a second ring body. The sidewall of the second ring body is provided with a spiral groove. A protrusion is fixedly connected to the interior of the first ring body, and the protrusion slides into the spiral groove. When the movable ring is restricted from rotating, the protrusion and the spiral groove cooperate to cause the movable ring to move axially when the rotating ring rotates.

[0007] The front of the back shell is fixedly connected to a cover, and the back of the cover is fixedly connected to a plurality of rods. The sidewalls of the first ring body are provided with slots, and the rods engage with the slots. The rods engage with the slots, restricting the rotation of the movable ring. When the end of the movable ring contacts the cover, the rotation of the take-up wheel is restricted, thus activating the anti-drop function.

[0008] A friction ring is inserted and fixedly connected to the middle of the fixed shaft. Several engaging elements are positioned at equal angles on the outer side of the friction ring. One end of each engaging element is pivotally connected to the second ring body. A U-shaped spring is positioned on the back of each engaging element, the other side of which contacts the inner wall of the second ring body. The U-shaped spring forces the engaging element to adhere tightly to the friction ring. During the rotation of the rotating ring, the friction generated between the friction ring and the engaging element reduces the rotation speed of the rotating ring, and thus the release speed of the cable. This structure acts as a buffer in the event of a fall, significantly reducing the impact on the user and thus preventing injury from excessive impact.

[0009] Preferably, a coil spring is sleeved and fixedly connected to the fixed shaft, and the other end of the coil spring is fixedly connected to the inner wall of the take-up wheel. The coil spring is wound in a groove inside the take-up wheel. After the steel cable is pulled out, the coil spring stores elastic potential energy and, when the steel cable is not under stress, gathers the steel cable into the take-up wheel.

[0010] Preferably, a spring is sleeved onto the pin, with one end of the spring abutting the support block and the other end abutting a counterweight column pre-set at the end of the pin. The spring maintains the pin's movement toward the fixed axis. The spring ensures the pin's proper position under normal use, while the counterweight column increases the pin's sensitivity to radial movement.

[0011] Preferably, a plurality of bolts are inserted through the edge of the cover, and the bolts are threadedly connected to the back shell, thereby fixing the cover to the back shell.

[0012] Preferably, the upper end of the back shell is provided with a lifting lug, and the lifting lug is provided with a through hole, through which a sling passes to suspend the fall arrester.

[0013] Preferably, the lower end of the back shell is provided with a perforation, and a wire loop is provided in the perforation, and the steel cable passes through the middle of the wire loop. The upper and lower inner walls of the wire loop are both curved and smooth to reduce wear of the steel cable.

[0014] The first ring body is axially fixedly connected to an indicator rod, which is set through the cover. After the device is triggered, the movable ring moves axially, and the indicator rod protrudes from the surface of the cover, indicating that the fall arrester has been triggered and needs to be repaired, thereby improving the safety of reuse.

[0015] The beneficial effects of the present invention are as follows:

[0016] A take-up wheel, a locking frame, a rotating ring and a moving ring are provided. The locking frame is fixed on the take-up wheel, and a pin hole and a pin rod are provided between the locking frame and the rotating ring. When the speed of the take-up wheel is too fast, the pin rod extends into the inside of the pin hole. A spiral groove and a protrusion are provided between the rotating ring and the moving ring. During the rotation of the rotating ring, the moving ring moves axially and contacts the sealing cover to stop the entire transmission, which has an anti-fall effect. Furthermore, a friction ring and an engaging part are provided on the inner side of the rotating ring. During the rotation of the rotating ring, the rotation speed of the take-up wheel is reduced by the friction between the friction ring and the engaging part, that is, the release speed of the steel cable is slowed down. That is, when the user falls, the steel cable will not stop releasing immediately, but will first reduce the release speed and then stop. In this way, the user is subjected to less impulse, which greatly improves the user's physical experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0018] Figure 2 It is an explosion diagram of the present invention;

[0019] Figure 3 This is a schematic internal diagram of the present invention from a frontal perspective;

[0020] Figure 4 is a three-dimensional schematic diagram of the embracing member of the present invention;

[0021] Figure 5 is a schematic diagram of the inner side of the cover of the present invention;

[0022] Figure 6 is a three-dimensional schematic diagram of the mobile ring of the present invention;

[0023] Figure 7 It is a three-dimensional schematic diagram of the locking frame of the present invention;

[0024] Figure 8 It is a three-dimensional schematic diagram of the rotating ring of the present invention.

[0025] List of reference numerals:

[0026] 1. Cover; 2. Bolt; 3. Back shell; 4. Lifting lug; 5. Moving ring; 6. Clamping piece; 7. U-shaped spring; 8. Friction ring; 9. Fixed shaft; 10. Take-up wheel; 11. Coil spring; 12. Locking frame; 13. Rotating ring; 14. Steel cable;

[0027] 101, insertion rod; 501, first ring body; 502, slot; 503, protrusion; 504, indicator rod; 1201, pin rod; 1202, support block; 1203, spring; 1204, support frame; 1301, second ring body; 1302, pin hole; 1303, spiral groove. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0029] like Figures 1 to 8 As shown, a fall arrester includes a back shell 3, which is a thin shell. Its structural outline is similar to the shape of existing mainstream fall arresters. A fixed shaft 9 is fixedly connected to the interior of the back shell 3, and a take-up wheel 10 is rotatably connected to the fixed shaft 9. The edge of the take-up wheel 10 is tightened with a steel cable 14. When in use, one end of the steel cable 14 is tied to the user's safety belt.

[0030] A locking frame 12, a rotating ring 13 and a moving ring 5 are sequentially provided on one side of the take-up wheel 10. The locking frame 12 includes a support frame 1204. The support frame 1204 is a plate-shaped member with a plurality of fan-shaped through holes provided thereon. The support frame 1204 is fixedly connected to the take-up wheel 10 and is fixedly connected to the take-up wheel 10 by threaded connection or welding. A bearing or bearing shell is further provided between the take-up wheel 10, the support frame 1204 and the fixed shaft 9. The edge of the support frame 1204 is fixedly connected to a plurality of support Block 1202, a pin rod 1201 is radially movably provided on the support block 1202, that is, during the rotation of the take-up wheel 10, the pin rod 1201 is radially thrown out under the action of centrifugation, and the rotating ring 13 includes a second ring body 1301, and a pin hole 1302 is provided inside the second ring body 1301, and the pin hole 1302 and the pin rod 1201 cooperate. If the speed of the take-up wheel 10 is too fast, the pin rod 1201 moves radially and extends into the pin hole 1302, and the rotating ring 13 also rotates at this time.

[0031] Furthermore, in order to improve the hit rate of the pin rod 1201 extending into the pin hole 1302, the pin rod 1201 and the lower hole 1302 are arranged at several equal angles, or a wedge block is set on one side of the pin hole 1302. Even if the pin rod 1201 does not extend into the pin hole 1302, the side wall of the end of the pin rod 1201 will press against one side of the wedge block, thereby pushing the rotating ring 13 to rotate.

[0032] The movable ring 5 includes a first ring body 501, which is sleeved on the side wall of the second ring body 1301. The side wall of the second ring body 1301 is provided with a spiral groove 1303, and the spiral groove 1303 is provided with three rows. The interior of the first ring body 501 is fixedly connected with a protrusion 503, and the protrusion 503 slides in the spiral groove 1303. That is, during the rotation of the rotating ring 13, the movable ring 5 moves axially through the setting of the protrusion 503 and the spiral groove 1303.

[0033] The front of the back shell 3 is covered and fixedly connected with a cover 1, which seals the back shell 3. The back of the cover 1 is fixedly connected with a number of insertion rods 101. The side wall of the first ring body 501 is provided with a slot 502. The insertion rod 101 and the slot 502 cooperate with each other. When the insertion rod 101 and the slot 502 are assembled, the movable ring 5 can only move axially. When the movable ring 5 is in contact with the cover 1, the rotating ring 13 and the take-up wheel 10 are restricted and stopped from rotating, which plays a role in preventing falling.

[0034] A friction ring 8 is inserted and fixedly connected to the middle of the fixed shaft 9. The outer side of the friction ring 8 is a grinding wheel-like structure, and the inner side is a support ring. Several engaging elements 6 are arranged at equal angles on the outer side of the friction ring 8. Friction is generated between the friction ring 8 and the engaging elements 6. One end of the engaging element 6 is rotatably connected to the second ring body 1301. A U-shaped spring 7 is provided on the back of the engaging element 6. The other side of the U-shaped spring 7 contacts the inner wall of the second ring body 1301. The U-shaped spring 7 forces the engaging element 6 to adhere tightly to the friction ring 8. After the pin 1201 is inserted into the pin hole 1302, the rotating ring 13 rotates. The friction between the engaging elements 6 and the friction ring 8 reduces the rotation speed of the take-up reel 10, thereby significantly reducing the impulse applied to the user and minimizing any injuries.

[0035] A coil spring 11 is sleeved and fixedly connected to the fixed shaft 9, and the other end of the coil spring 11 is fixedly connected to the inner wall of the take-up wheel 10. After the steel cable 14 is rotated and pulled out from the back shell 3, the coil spring 11 deforms and stores elastic potential energy. When the steel cable 14 is not subjected to external force, the coil spring 11 releases the elastic potential energy and reels the steel cable back into the back shell 3.

[0036] A spring 1203 is sleeved on the pin rod 1201, one end of the spring 1203 presses against the support block 1202, and the other end presses against the counterweight column preset at the end of the pin rod 1201. The spring 1203 keeps the pin rod 1201 moving toward the fixed axis 9, that is, the spring 1203 ensures the position of the pin rod 1201. At the same time, the use of the counterweight column improves the sensitivity of the pin rod 1201 to radial throwing during the rotation process.

[0037] A plurality of bolts 2 are inserted through the edge of the cover 1 , and the bolts 2 are threadedly connected to the back shell 3 , so that the cover 1 is fixedly connected to the back shell 3 through the bolts 2 .

[0038] The upper end of the back shell 3 is provided with a lifting lug 4, and a through hole is provided on the lifting lug 4. A sling is passed through the through hole to hang the fall arrester.

[0039] The lower end of the back shell 3 is provided with a through hole, and a wire loop is provided in the through hole. The upper and lower inner walls of the guide loop are both arc surfaces to reduce the wear of the steel cable 14. The steel cable 14 passes through the middle of the wire loop.

[0040] An indicator rod 504 is axially fixedly connected to the first ring body 501 and extends through the cover 1. When the arrester is triggered, the indicator rod 504 protrudes from the end cap of the cover 1, indicating that the arrester has been used and needs to be opened for inspection. At the same time, the engagement of the clasping member 6 and the friction ring 8 prevents the indicator rod 504 from being easily pushed back manually.

[0041] Working principle: When in use, the fall arrester is suspended and one end of the steel cable 14 is tied to the user. If an accidental fall occurs, the speed of the take-up wheel 110 is too fast, and the pin rod 1201 is thrown out and engaged in the pin hole 1302. At this time, the rotating ring 13 rotates, and the movable ring 5 engaged with the thread groove 1303 and the protrusion 503 moves axially. During the process, the engaging part 6 also rotates, and the friction between the engaging part 6 and the friction ring 8 reduces the speed of the take-up wheel 10. When the movable ring 5 contacts the cover 1, the take-up wheel 10 stops rotating, thereby achieving the anti-fall effect.

[0042] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above-mentioned embodiment, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A fall arrester, characterized in that: It comprises a back shell (3), wherein the interior of the back shell (3) is fixedly connected to a fixed shaft (9), a take-up wheel (10) is rotatably connected to the fixed shaft (9), and a steel cable (14) is gathered at the edge of the take-up wheel (10); A locking frame (12), a rotating ring (13) and a movable ring (5) are sequentially provided on one side of the take-up wheel (10); the locking frame (12) includes a support frame (1204), and the support frame (1204) is fixedly connected to the take-up wheel (10); a plurality of support blocks (1202) are fixedly connected to the edge of the support frame (1204); a pin rod (1201) is radially movably provided on the support block (1202); the rotating ring (13) includes a second ring body (1301); a pin hole (1302) is provided inside the second ring body (1301), and the pin hole (1302) and the pin rod (1201) cooperate; The movable ring (5) comprises a first ring body (501), the first ring body (501) being sleeved on the side wall of a second ring body (1301), the side wall of the second ring body (1301) being provided with a spiral groove (1303), a protrusion (503) being fixedly connected to the interior of the first ring body (501), and the protrusion (503) being slidably fitted in the spiral groove (1303); The front of the back shell (3) is fixedly connected to a cover (1), the back of the cover (1) is fixedly connected to a plurality of insertion rods (101), the side wall of the first ring body (501) is provided with slots (502), and the insertion rods (101) and the slots (502) cooperate; A friction ring (8) is inserted and fixedly connected to the middle of the fixed shaft (9), and a plurality of engaging members (6) are provided at equal angles on the outer side of the friction ring (8). One end of the engaging member (6) is rotatably connected to the second ring body (1301), and a U-shaped elastic member (7) is provided on the back side of the engaging member (6), and the other side of the U-shaped elastic member (7) is in contact with the inner wall of the second ring body (1301).

2. A fall arrester according to claim 1, characterized in that: A coil spring (11) is sleeved and fixedly connected to the fixed shaft (9), and the other end of the coil spring (11) is fixedly connected to the inner wall of the take-up wheel (10).

3. A fall arrester according to claim 1, characterized in that: A spring (1203) is sleeved on the pin rod (1201), one end of the spring (1203) abuts against the support block (1202), and the other end abuts against a counterweight column preset at the end of the pin rod (1201). The spring (1203) keeps the pin rod (1201) moving toward the fixed axis (9).

4. A fall arrester according to claim 1, characterized in that: A plurality of bolts (2) are inserted through the edge of the cover (1), and the bolts (2) are threadedly connected to the back shell (3).

5. A fall arrester according to claim 1, characterized in that: The upper end of the back shell (3) is provided with a lifting ear (4), and the lifting ear (4) is provided with a through hole.

6. A fall arrester according to claim 1, characterized in that: The lower end of the back shell (3) is provided with a through hole, and a wire loop is provided in the through hole, and the steel cable (14) passes through the middle of the wire loop.

7. A fall arrester according to claim 1, characterized in that: An indicator rod (504) is axially fixedly connected to the first ring body (501), and the indicator rod (504) is arranged to pass through the cover (1).

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