High efficiency rope tightener

Abstract

The application discloses a high-efficiency rope tightener, which comprises a base, a reel pivotally connected to the base, a coaxial arrangement of a ratchet one and a ratchet two, and a rocker arm pivotally arranged on the base and coaxially arranged with the reel, wherein the ratchet one and the ratchet two are integrated into a double-ratchet assembly through a connecting plate, and the double-ratchet assembly is installed on the reel; further comprising a bandage, wherein the bandage is arranged through the reel and the connecting plate to form a sandwich structure of the reel, the bandage and the connecting plate from bottom to top. When the position of the rope tightener on the bandage needs to be adjusted, the bandage is pulled to the two sides along the bandage to generate slippage between the reel and the connecting plate, so that the length proportion of the two ends of the bandage is adjusted, and the rope tightener body can be stopped at any position. Meanwhile, the bandage is arranged to pass through the middle of the reel, and the two ends are pulled out together or recovered synchronously through a clock spring, bidirectional rope output is realized, and the rope tightener can be adapted to multi-angle and multi-directional binding working conditions.

Description

Technical Field

[0001] This invention relates to the field of cargo bundling technology, specifically a high-efficiency rope tensioner. Background Technology

[0002] Secure cargo is a common requirement in logistics, transportation, outdoor equipment, and vehicle cargo transport. Traditional methods of cargo securing typically involve directly wrapping the cargo with ropes or straps, but this is time-consuming, labor-intensive, and makes it difficult to achieve the appropriate tension.

[0003] Currently, there are various ratchet rope tighteners (also known as ratchet-type binding tighteners) on the market. Their basic principle is: one end of the rope is fixed to the carrier, and the other end is wound around a rotating shaft with a ratchet. By using a rocker arm to move the ratchet on the rotating shaft, the moving part of the rope is continuously wound up, thereby achieving the binding and tightening effect. However, the binding strap can only be pulled outward from one side, and the direction of the cable exit is fixed. It is greatly restricted by the shape of the goods and the installation point, making it difficult to adapt to multi-angle and multi-directional binding conditions.

[0004] The conventional unidirectional winding structure is prone to causing the straps to stack and deviate on one side, which aggravates the wear of the straps. In addition, it is difficult to install and deploy in a narrow working space, which significantly limits its applicable scope.

[0005] The applicant has filed a patent application, "CN119749953B," for a novel strap tightener. This device employs two independent winding shafts (winding shaft one + winding shaft two), allowing the fixing ropes wound on both shafts to extend freely for securing goods. The position of the support can be adjusted by unwinding or rewinding the two fixing ropes. While this solution addresses the aforementioned issues to some extent, it still has the following shortcomings: ① The double-spring and ratchet design is bulky and heavy, making it inconvenient to use; ② The right ratchet is passively subjected to force, leading to slight displacement due to pulling; ③ Once the strap on the right is pulled out, it is directly pulled back by the spring, requiring continuous external force to maintain its position, or an additional locking mechanism, resulting in a complex structure.

[0006] This case arose in order to resolve the aforementioned issues. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a high-efficiency rope tensioner, which solves the problems mentioned in the background section.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency rope tensioner, comprising a base, a reel pivotally connected to the base, two ratchet wheels coaxially arranged, and a rocker arm. The rocker arm is rotatably mounted on the base and arranged coaxially with the reel. The ratchet wheels form an integrated double ratchet assembly via a connecting plate, and the integrated double ratchet assembly is mounted on the reel. It also includes a strap that passes between the reel and the connecting plate, forming a "sandwich" structure consisting of the reel, strap, and connecting plate from bottom to top. The rocker arm is equipped with a locking mechanism that can rotate relative to the base to switch positions. When switched to the first position (where the strap can only extend outwards) or the second position (where it can extend and retract), the strap is pulled from both sides until it changes from a wound state to sliding between the reel and the connecting plate, allowing the tensioner body to move along the strap and adjust the length ratio of the two ends of the strap.

[0009] As a preferred embodiment, the connecting plate is further arched and has a groove in the middle to avoid the strap and the spool. A radial assembly gap of 1.2~2mm is left between the connecting plate and the spool to allow the entire strap to slide between the spool and the connecting plate.

[0010] The strap thickness is typically around 1mm, and the assembly gap is around 1.5mm. Because the two rope outlets are located on the left and right sides below the reel, when the strap is pulled to move, the strap will form a triangle, naturally creating a certain amount of friction.

[0011] As a preferred embodiment, the locking mechanism can further rotate relative to the base to switch positions to a third position where the strap can "enter and exit"; the side of the base is provided with a groove, a limiting section, and a smooth transition section in sequence; when the locking mechanism is in the groove, it is in the first position; when the locking mechanism is in the limiting section, it is in the second position; and when the locking mechanism is in the smooth arc section, it is in the third position.

[0012] As a preferred embodiment, the rocker arm further comprises a protrusion with a continuous non-linear arc profile, the arc length of which is greater than or equal to the total arc length of the locking mechanism as it rotates from the groove to the smooth arc segment; when the locking mechanism is in the first and second positions, the lower locking block is pushed radially outward by the protrusion and cannot contact ratchet one or ratchet two. After the locking mechanism rotates to the smooth arc segment, the protrusion no longer contacts the lower locking block, and the lower locking block intervenes in the stroke limitation of ratchet one or ratchet two to realize the "in-only" function of the third gear.

[0013] As a preferred embodiment, the lower locking block is further movably mounted on the base in the radial direction, and a connecting rod is provided at the tail of the lower locking block. A slide rail is provided on the side of the base for the lower locking block to slide. A spring supporting the lower locking block is sleeved on the connecting rod. Under no external force, the distance between the radially inner end of the lower locking block and the axis of the scroll is less than the outer diameter of the ratchet and greater than the inner diameter of the ratchet, so that it can be placed into the limiting groove of the ratchet under normal conditions.

[0014] As a preferred embodiment, the locking mechanism further includes a spring and a pull plate disposed within a rocker arm, and a spring seat is installed at the end of the rocker arm near the pull plate and the spring. A second spring is connected between the spring seat and the spring and the pull plate, respectively.

[0015] As a preferred embodiment, the spring is further formed by bending a thin metal sheet at 180° to form a U-shaped structure; one end of the spring is shorter and fits against the lower pull tab, which is the fixed section, and the other end is longer and independent, which is the working section.

[0016] As a preferred embodiment, the pull tab is further provided with a bent portion below it, which extends into the working end of the spring to form a linkage structure; by lifting the pull tab outward, the spring can be driven to move radially outward, so that the spring is completely disengaged from contact with ratchet one or ratchet two, allowing the rocker arm to rotate without restriction.

[0017] As a preferred embodiment, the ratchet 1 and ratchet 2 are further provided with a ring of ratchet teeth with high and low sides on the outside, and a recessed limiting groove is provided at the junction of two adjacent ratchet teeth; the high side of the ratchet teeth is used to abut against the lower locking block to form a lock in the third gear position; the limiting groove is used to accommodate the working section of the spring piece to form a lock in the first gear position.

[0018] As a preferred embodiment, the base is further provided with a first outlet groove and a second outlet groove at each end. The outlet slot is used for the same strap to enter and exit.

[0019] As a preferred embodiment, the first outlet groove is located on the side away from the rocker arm, and the base is provided with a steering guide roller at the same height as the first outlet groove.

[0020] By adopting the above technical solution, the high-efficiency rope tensioner provided by the present invention has the following advantages compared with the prior art: 1. When it is necessary to adjust the position of the tensioner on the strap, the present invention pulls the strap to both sides, causing the strap to slide between the roller and the connecting plate (the entire tensioner can move horizontally on the strap), thereby adjusting the length ratio of the straps at both ends, so that the tensioner body can stay in any position; when the force is released, the spring returns to retract the strap again.

[0021] 2. This invention utilizes a strap that passes through the middle of the reel and is pulled out from both ends simultaneously or retracted synchronously via a spring, achieving bidirectional rope output and adapting to multi-angle and multi-directional binding conditions. Furthermore, because it is a single strap that tightens simultaneously from both ends, displacement is avoided.

[0022] 3. The present invention has a small overall size, making it easy to carry. When the strap is tightened, both ends are retracted simultaneously, resulting in more stable force distribution and no shaking of the machine body. Therefore, it is easier for users to provide greater tightening force and achieve a reasonably distributed mechanical structure. Attached Figure Description

[0023] Figure 1 This is a side view schematic diagram of the first section of the present invention; Figure 2 This is a side view of the cross-section of section ① of the present invention; Figure 3 This is a side view schematic diagram of the second section of the present invention; Figure 4 This is a side view of the cross-section of section ② of the present invention; Figure 5 This is a side view schematic diagram of the third section of the present invention; Figure 6 This is a side view of the cross-section of section ③ of the present invention; Figure 7 This is a schematic diagram of the spring sheet structure of the present invention; Figure 8 This is a schematic diagram of the pull tab structure of the present invention.

[0024] In the diagram, 1. Base; 2. Steering guide roller; 3. First outlet groove; 4. Second outlet groove; 5. Rocker arm; 6. Reel; 7. Spring; 8. Spring box; 9. Connecting rod; 10. Spring seat; 11. Ratchet 1; 12. Ratchet 2; 13. Connecting plate; 14. Spring piece; 15. Pull piece; 16. Anti-rotation shaft; 17. Lower locking block; 18. Spring 1; 19. Protrusion; 20. Spring 2; 21. Ratchet; 22. Limiting groove; 23. Groove. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] See appendix Figure 1-6 A high-efficiency rope tensioner includes a base 1, a reel 6 for winding up the straps, a connecting plate 13, a rocker arm 5, and a lower locking block 17.

[0027] The scroll 6 is pivotally connected to the base 1. Ratchet 11 and Ratchet 2 12 are coaxially mounted on both sides of the scroll 6. The rocker arm 5 is rotatably mounted on the base 1 and coaxially arranged with the scroll 6. The strap on the scroll 6 is wound clockwise. Ratchet 11 and Ratchet 2 12 form an integrated double ratchet assembly via the connecting plate 13 and are installed on the scroll 6. During installation, simply press the double-hook strap between the scroll 6 and the connecting plate 13. The strap is a single piece with hooks at both ends, installed in the middle, roughly forming a "sandwich" structure: the scroll 6 at the bottom, the double-hook strap in the middle, and the connecting plate 13 at the top.

[0028] The core feature mentioned above is the sandwich structure, specifically: the lower spool 6 is a single spool 6, the middle double hook strap passes through the middle of the spool 6, and the upper connecting plate 13 is connected to ratchet 11 and ratchet 2 12 by stamping deformation to form an integrated component.

[0029] One end of the spool 6 has a long slot and is fixed to the inner end of the spring 7. The spring 7 is housed in the spring box 8. When the strap is pulled out, the spring 7 winds up to store energy, so that the strap maintains a certain pretension after it is retracted. When the strap is loosened, the spring 7 rebounds, the strap is automatically retracted, and a certain pretension is provided to prevent the strap from loosening. The integrated double ratchet assembly is installed on the base 1 in one go via the spool 6. The end of the spool 6 away from the spring 7 has a positioning groove and is limited at the end by a retaining spring (a standard part, not described in detail).

[0030] When the spool 6 and connecting plate 13 rotate, the double-hook straps in the middle rotate passively, thus tightening both ends simultaneously. When the double-hook straps are pulled to both sides until they are no longer wound around the spool 6, they can slide between the spool 6 and connecting plate 13 ("sandwich" sliding, meaning the entire tensioner can move horizontally on the straps to adjust its position; the straps slide by manual pulling), thereby adjusting the length ratio of the straps at both ends, allowing the tensioner body to stop at any position. When releasing force, the spring 7 automatically retracts the double-hook straps.

[0031] It should be noted that the above-mentioned tensioner can be adjusted on the premise that the rocker arm 5 drives the spring 14 and the pull plate 15 to the position of the base 1 where the strap can only go out and not in or the position of the strap can go in and out.

[0032] Ratchet 11 and Ratchet 2 12 are improvements on conventional ratchet mechanisms. They are provided with a ring of ratchet teeth 21 with high and low edges on the outside, and a recessed limiting groove 22 is provided at the junction of two adjacent ratchet teeth 21.

[0033] See appendix Figure 1-6As shown, the rocker arm 5 is equipped with a locking mechanism for locking the ratchet. The base 1 has a groove 23, a limiting section, and a smooth arc section on its side. When the locking mechanism is in the groove 23, the strap can only go out and not in as position ①. When the locking mechanism is in the limiting section, the strap can go in and out as position ②. When the locking mechanism is in the smooth arc section, the strap can only go in and not out as position ③.

[0034] The limiting section is a raised section formed / set with intervals directly on the side of the base 1 to restrict the rotation of the locking mechanism. The smooth arc section is the side of the base 1 directly.

[0035] A curved protrusion 19 is formed on the rocker arm 5. The length of the arc of this protrusion 19 is greater than or equal to the length of the locking mechanism as it rotates from the groove 23 to the smooth arc segment (i.e., positions ① and ②). This protrusion 19 pushes the lower locking block 17 radially outward, preventing it from contacting the ratchet and thus avoiding its operation. When the locking mechanism rotates to the smooth arc segment, the protrusion 19 no longer contacts the lower locking block 17. At this time, the lower locking block 17 intervenes in the travel restriction of the ratchet, realizing the strap-only-in-no-out function in position ③.

[0036] Specifically, the lower locking block 17 is radially movably mounted on the base 1. A connecting rod 9 is located at the tail of the lower locking block 17. A slide rail is provided on the base 1 for the lower locking block 17 to slide on, and a spring 18 is sleeved on the connecting rod 9. The spring 18 supports the lower locking block 17. When no external force is applied, the distance between the end of the lower locking block 17 and the axis of the scroll 6 is less than the outer diameter of the ratchet 21 and greater than the inner diameter of the ratchet 21, allowing it to be inserted into the limiting slot 22 of the ratchet under normal conditions.

[0037] The locking mechanism includes a spring plate 14 and a pull plate 15 installed inside the rocker arm 5. A spring seat 10 is installed at the end of the rocker arm 5 near the pull plate 15 and the spring plate 14. A spring 20 is connected between the spring seat 10 and the spring plate 14 and the pull plate 15 respectively.

[0038] See appendix Figure 7-8 As shown, the spring 14 is a thin sheet of metal bent 180° to form a "U" shape, preferably made of 301 material. The shorter end of the spring 14 that fits against the lower pull tab 15 is the fixed section, and the longer end that is independent is the working section.

[0039] When the locking mechanism is in position ①, the working section of the spring piece 14 is positioned into the limiting groove 22 by means of the second spring 20. When the strap is pulled out, the ratchet rotates clockwise, and the working section of the spring piece 14 is elastically bent by the ratchet teeth 21 of the ratchet. The working section is pressed down until it is limited and no longer deforms. At this time, the entire spring piece 14 is within the limiting groove 22, which limits the rotation of the ratchet and achieves the function of allowing the strap to only go in and not out. When the ratchet rotates counterclockwise, there is no constraint on the upper side of the working section of the spring piece 14, and it is not restricted by rotation.

[0040] The tail of the spring piece 14 and the pull piece 15 are also provided with a connecting rod 9. The rocker arm 5 is provided with a sliding groove for the card and the spring piece 14 to slide. The second spring 20 is sleeved on the connecting rod 9.

[0041] The above functional principle is divided into the following three states (the process can be found in the following text). Figure 2 --> Figure 4 --> Figure 6 ): Figure 2 ① Position: The strap can only go out and not in, that is, the ratchet cannot rotate clockwise. When rotating clockwise, the spring piece 14 is embedded in the ratchet tooth groove and cannot be pressed down (it is pressed down and deformed to the lower pull piece 15 and is blocked by it), which causes the ratchet to not rotate; while when the ratchet rotates counterclockwise, the spring piece 14 can deform upward (without restriction) and is not restricted from rotating.

[0042] Figure 4 ② Position: The strap can go in and out, that is, the rotation of the ratchet is not restricted by the position of the limiting block and the spring 14 (no longer in contact with the limiting block and the spring 14).

[0043] Figure 6 ③ Position: The strap can only go in and not out, that is, the ratchet can only rotate clockwise. When it rotates counterclockwise, the high edge of the ratchet 21 is against the lower locking block 17 and cannot rotate.

[0044] In the aforementioned gears ① and ②, the presence of a protrusion 19 with a certain arc length on the outer periphery of the rocker arm 5 pushes the lower locking block 17 radially outward, ensuring that the lower locking block 17 does not contact the ratchet in the gear ① and ② regions.

[0045] The positions of gear ①, gear ②, and gear ③ mainly refer to the different areas of the pull plate 15 relative to the side of the base 1 under the rotation of the rocker arm 5.

[0046] The rocker arm 5 switches gears by manually pressing the pull tab 15 inwards. The pull tab 15 simultaneously drives the spring 14 to move outwards to disengage from the ratchet's limiting teeth, and thus the gear can be changed by rotation.

[0047] Specifically, the strap only goes in and not out when the rocker arm 5 is in position ③. The spring plate 14 and pull plate 15 remain firmly against the base 1 under the spring force. Because the groove depths on the base 1 for this position are different, the spring plate 14 and pull plate 15 descend to different positions. The spring plate 14 contacts the ratchet, while the pull plate 15 does not. When the strap is pulled out, the working section of the spring plate 14 is pressed down by the ratchet, reducing the "U"-shaped opening angle. When the ratchet teeth contact the working section of the spring plate 14, the opening angle is at its maximum, then it springs open, repeating this process. The ratchet rotates, and the strap is pulled out. When released, under the restoring force of the spring spring 7, the ratchet begins to reverse. When the strap retracts, because the working section of the spring plate 14 is pushed down by the ratchet, the "U"-shaped opening angle decreases, eventually pressing down to the fixed section (restricted by the fixed position of the lower pull plate 15). The ratchet is locked and cannot rotate, completing the function of only going out and not going in.

[0048] The first gear, second gear, and third gear mentioned above are briefly referred to as gear ①, gear ②, and gear ③, respectively.

[0049] The base 1 has a first outlet groove 3 and a second outlet groove 4 at its two ends for the strap to enter and exit, and both are used for the same strap. At the same time, a guide roller 2 is provided at a similar height in the second outlet groove 4 to keep the strap as horizontal as possible when it moves at the inlet and outlet positions, so as to reduce friction loss between the strap and the groove walls of the first outlet groove 3 and the second outlet groove 4.

[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency rope tensioner, comprising a base (1), a reel (6) pivotally connected to the base (1), a ratchet wheel one (11) and a ratchet wheel two (12) coaxially arranged, and a rocker arm (5), wherein the rocker arm (5) is rotatably mounted on the base (1) and arranged coaxially with the reel (6), characterized in that: The ratchet one (11) and ratchet two (12) form an integrated double ratchet assembly through the connecting plate (13), and the integrated double ratchet assembly is installed on the reel (6); It also includes a strap that passes between the spool (6) and the connecting plate (13), forming a "sandwich" structure consisting of the spool (6), the strap and the connecting plate (13) from bottom to top; The rocker arm (5) is equipped with a locking mechanism, which can rotate relative to the base (1) to switch gears. When switched to the first gear where a strap "only goes out and does not go in" or the second gear where "it can go in and out", a strap is pulled on both sides until a strap changes from a wound state to sliding between the spool (6) and the connecting plate (13), so that the tensioner body can move along the strap to adjust the length ratio of the two ends of the strap.

2. The high-efficiency rope tensioner according to claim 1, characterized in that: The connecting plate is arched and has a groove in the middle to avoid the strap and the spool (6). A radial assembly gap of 1.2-2mm is left between the connecting plate and the spool (6) so that the strap can slide between the spool (6) and the connecting plate (13).

3. The high-efficiency rope tensioner according to claim 1, characterized in that: The locking mechanism can also rotate relative to the base (1) to switch positions to the third position where the strap can "enter and exit"; the side of the base is provided with a groove (23), a limiting section and a smooth transition section in sequence; The locking mechanism is in the first position when it is in the groove (23), in the second position when it is in the limiting section, and in the third position when it is in the smooth arc section.

4. The high-efficiency rope tensioner according to claim 3, characterized in that: The rocker arm (5) has a protrusion (19) with a continuous non-linear arc profile. The arc length of the protrusion (19) is greater than or equal to the total arc length of the locking mechanism as it rotates from the groove (23) to the smooth arc segment. When the locking mechanism is in the first position and the second position, the lower side of the base (1) is provided with a lower locking block (17). The lower locking block (17) contacts the protrusion (19) and is pushed radially outward so that it cannot contact ratchet one (11) or ratchet two (12). After the locking mechanism rotates to the smooth arc segment, the protrusion (19) no longer contacts the lower locking block (17), and the lower locking block (17) intervenes in the stroke limitation of the ratchet one (11) or the ratchet two (12) to realize the "only in, no out" function of the third gear.

5. The high-efficiency rope tensioner according to claim 4, characterized in that: The lower locking block (17) is movably mounted on the base (1) in the radial direction. A connecting rod (9) is provided at the tail of the lower locking block (17). A slide rail for sliding the lower locking block (17) is provided on the side of the base (1). A spring (18) supporting the lower locking block (17) is sleeved on the connecting rod. Under no external force, the distance between the radial inner end of the lower locking block (17) and the axis of the scroll (6) is less than the outer diameter of the ratchet (21) and greater than the inner diameter of the ratchet (21).

6. The high-efficiency rope tensioner according to claim 4, characterized in that: The locking mechanism includes a spring plate (14) and a pull plate (15) disposed in the rocker arm (5). A spring seat (10) is installed at the end of the rocker arm (5) near the pull plate (15) and the spring plate (14). A second spring (20) is connected between the spring seat (10) and the spring plate (14) and the pull plate (15).

7. The high-efficiency rope tensioner according to claim 6, characterized in that: The spring (14) is formed by bending a metal sheet at 180° to form a U-shaped structure; one end of the spring (14) is shorter and fits against the lower pull tab (15) as a fixed section, and the other end is longer and independent as a working section; the pull tab (15) has a bent part below it and extends into the working end of the spring (14) to form a linkage structure; by lifting the pull tab (15), the spring (14) can be driven to move radially outward, so that the spring (14) is completely separated from the contact with ratchet one (11) or ratchet two (12).

8. The high-efficiency rope tensioner according to any one of claims 7, characterized in that: The ratchet 1 (11) and ratchet 2 (12) are provided with a ring of ratchet teeth (21) with high and low sides, and a recessed limiting groove (22) is provided at the junction of two adjacent ratchet teeth (21). The high side of the ratchet (21) is used to abut against the lower locking block (17) in the third gear position to form a lock; the limiting slot (22) is used to accommodate the working section of the spring piece (14) in the first gear position to form a lock.

9. The high-efficiency rope tensioner according to claim 1, characterized in that: The base has a first outlet groove (3) and a second outlet groove (4) at its two ends, which are used to allow the same strap to enter and exit.

10. The high-efficiency rope tensioner according to claim 9, characterized in that: The first outlet groove (3) is located on the side away from the rocker arm (5), and the base (1) is provided with a steering guide roller (2) at the same height as the first outlet groove (3).

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