Reel and reel apparatus
By introducing a swing block and a limiting structure into the winding and unwinding equipment, the elastic force of the coil spring is used to automatically lock the winding, solving the problem of cumbersome operation in the existing technology and improving the convenience of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING KUKE ELECTRONIC TECH CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-09
AI Technical Summary
Existing winding and unwinding equipment is cumbersome to operate when it is necessary to restrict the winding of the coil spring, requiring additional locking operations.
By setting up a swing block and a limiting structure, the elastic force of the coil spring is used to drive the rotating component to rotate. The limiting structure restricts the sliding of the swing block in a specific direction, thereby automatically locking the coil spring and avoiding additional operations.
It achieves automatic locking of the coiled wire without additional operation, improving operational convenience.
Smart Images
Figure CN224336962U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wire winding and unwinding equipment, and in particular to a wire winding and unwinding mechanism and wire winding and unwinding equipment. Background Technology
[0002] Cable winding and unwinding equipment typically employs a winding and unwinding mechanism for cable winding and unwinding operations. This mechanism utilizes a coil spring to wind the cable around itself. During unwinding, the turntable rotates, pulling out the cable end and compressing the coil spring. During winding, the spring's elasticity drives the turntable in reverse, retracting the cable end. In practical applications, it's necessary to pull out a certain length of cable and then keep it stationary, i.e., to limit the coil spring's winding. Related technologies usually use locking pins to lock the turntable, restricting its rotation, but this process is cumbersome. Utility Model Content
[0003] The purpose of this invention is to provide a winding and unwinding mechanism and winding and unwinding equipment that can achieve winding of the restricted coil without additional operation, making the operation process more convenient.
[0004] This utility model provides a winding and unwinding mechanism, including a housing, a rotating assembly, a coil spring, and a swing block. A limiting structure is fixedly provided on the housing. The rotating assembly is rotatably connected to the housing, and the coil spring is fixedly connected to the rotating assembly. The coil spring is used for winding the wire. During the unwinding process, the rotating assembly rotates along a first direction and compresses the coil spring. During the winding process, the coil spring drives the rotating assembly to rotate along a second direction, the first direction being opposite to the second direction. The swing block is slidably disposed on the housing. The rotating assembly is used to push the swing block to slide on the housing. When the rotating assembly rotates along the second direction, the limiting structure can restrict the swing block from sliding on the housing.
[0005] As a preferred technical solution for the winding and unwinding mechanism, the rotating assembly includes a turntable and a rotating bracket arranged coaxially. The turntable is fixedly connected to the rotating bracket and rotatably connected to the outer casing. A coil spring is disposed between the turntable and the rotating bracket and is fixedly connected to the turntable. The diameter of the rotating bracket is larger than the diameter of the turntable. A lower protrusion is fixedly provided at the edge of the rotating bracket, and the lower protrusion is used to push the swing block to slide on the outer casing.
[0006] As a preferred technical solution for the winding and unwinding mechanism, the lower protrusions are configured in multiples, and the multiple lower protrusions are arranged at intervals along the circumference of the rotating bracket.
[0007] As a preferred technical solution for the winding and unwinding mechanism, an upper protrusion is fixedly provided on the side of the swing block facing the rotating bracket, and the upper protrusion is used to contact the lower protrusion. A limiting shaft is fixedly provided on the side of the swing block facing the outer shell. When the rotating assembly rotates in the second direction, the limiting structure can restrict the limiting shaft from sliding on the outer shell.
[0008] As a preferred technical solution for the winding and unwinding mechanism, the housing is further provided with a sliding seat, the sliding seat having a groove extending radially along the housing, and the side of the swing block facing the housing is also provided with a sliding shaft, the sliding shaft being slidably connected to the groove, and the sliding shaft being able to rotate within the groove.
[0009] As a preferred technical solution for the winding and unwinding mechanism, the winding and unwinding mechanism further includes an elastic element, which is mounted on the housing. The elastic element abuts against the swing block and is used to push the swing block to slide radially inward along the housing.
[0010] As a preferred technical solution for the winding and unwinding mechanism, the outer casing is further fixedly provided with two mounting seats, the elastic element is a spring sheet, the two ends of the spring sheet are respectively mounted on the two mounting seats, and the swing block abuts against the spring sheet.
[0011] As a preferred technical solution for the winding and unwinding mechanism, the limiting structure includes a first limiting block and a second limiting block. The first limiting block has a guide groove, and the second limiting block has a locking groove. The opening of the guide groove is opposite to the opening of the locking groove, and the guide groove extends toward the opening of the locking groove. When the rotating component rotates along the first direction, the limiting shaft slides to the guide groove and slides within the guide groove to one end near the opening of the locking groove. When the rotating component rotates along the second direction, the limiting shaft slides from the guide groove into the locking groove.
[0012] As a preferred technical solution for the winding and unwinding mechanism, the first limiting block and the second limiting block form a locking outlet, which is connected to the locking groove. When the limiting shaft is located in the locking groove and the rotating component rotates along the first direction, the limiting shaft slides from the locking groove to the locking outlet.
[0013] This utility model provides a winding and unwinding device, including the winding and unwinding mechanism of any of the above-described schemes.
[0014] The beneficial effects of this utility model are as follows:
[0015] This utility model provides a winding and unwinding mechanism. By setting a swing block and a limiting structure, the winding spring is compressed during the unwinding process. When it is necessary to limit the winding of the winding spring, the winding spring drives the rotating component to rotate in the second direction. When the rotating component rotates in the second direction, the limiting structure limits the swing block to slide on the outer shell, thereby limiting the rotation of the rotating component in the second direction and realizing the limitation of the winding of the winding spring. Thus, the limitation of the winding of the winding spring can be realized without additional operation, improving the convenience of operation. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the winding and unwinding mechanism in an embodiment of the present invention;
[0017] Figure 2 This is a schematic diagram of the winding and unwinding mechanism in this embodiment of the present invention, excluding the rotating bracket.
[0018] Figure 3 This is a schematic diagram of the sliding path of the limiting shaft between the first limiting block and the second limiting block in an embodiment of this utility model;
[0019] Figure 4 This is a schematic diagram of the winding and unwinding mechanism in its initial state in an embodiment of this utility model;
[0020] Figure 5 for Figure 4 A magnified view of part A in the middle;
[0021] Figure 6 This is one of the structural schematic diagrams of the winding and unwinding mechanism in the winding process of this utility model embodiment;
[0022] Figure 7 This is the second schematic diagram of the winding and unwinding mechanism in the winding process of this utility model embodiment;
[0023] Figure 8 This is a schematic diagram of the winding and unwinding mechanism in the locked state in an embodiment of this utility model;
[0024] Figure 9 This is one of the structural schematic diagrams of the winding and unwinding mechanism during the unlocking process in this utility model embodiment;
[0025] Figure 10 This is the second structural schematic diagram of the winding and unwinding mechanism in the unlocking process of this utility model embodiment;
[0026] Figure 11 This is a schematic diagram of the winding and unwinding mechanism in the unlocked state in an embodiment of this utility model;
[0027] Figure 12 This is a schematic diagram of the swing block in the embodiment of the present invention from a first perspective;
[0028] Figure 13 This is a schematic diagram of the swing block in a second perspective in an embodiment of this utility model.
[0029] In the picture:
[0030] 1. Turntable; 2. Coil spring; 3. Rotating bracket; 31. Lower protrusion; 4. Housing; 41. First limiting block; 411. Guide groove; 42. Second limiting block; 421. Locking groove; 43. Locking inlet; 44. Locking outlet; 45. Sliding seat; 46. Mounting seat; 5. Swing block; 51. Sliding shaft; 52. Upper protrusion; 53. Limiting shaft; 6. Elastic element. Detailed Implementation
[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0035] like Figures 1-13 As shown, this embodiment provides a winding and unwinding mechanism for winding and unwinding wire. The mechanism includes a housing 4, a rotating assembly, a coil spring 2, and a swing block 5. A limiting structure is fixedly provided on the housing 4. The rotating assembly is coaxial with and rotatably connected to the housing 4. The coil spring 2 is fixedly connected to the rotating assembly, and its centerline coincides with the axis of the rotating assembly. The coil spring 2 is used for winding the wire. During the unwinding process, pulling the wire end causes the rotating assembly to rotate in a first direction and compress the coil spring 2. During the winding process, the elastic force of the coil spring 2 drives the rotating assembly to rotate in a second direction, simultaneously winding the wire. The first and second directions are opposite. The swing block 5 is slidably disposed on the housing 4. The rotating assembly is used to push the swing block 5 to slide on the housing 4. During the unwinding process, an external force pulls the wire end, compressing the torsion spring and causing the rotating assembly to rotate in the first direction. During this process, the limiting structure does not restrict the swing block 5 from sliding on the housing 4. When the length of the wire meets the requirements, the external force is removed, and the rotating component rotates in the second direction under the elastic force of the torsion spring. When the rotating component rotates in the second direction, the limiting structure can restrict the swing block 5 from sliding on the outer shell 4, thereby restricting the rotating component from rotating in the second direction and realizing the restriction of the coil spring 2 from winding the wire. Thus, the restriction of the coil spring 2 from winding the wire can be realized without additional operation, improving the convenience of operation.
[0036] It should be noted that the winding and unwinding mechanism can wind up flexible materials such as wires, ropes, and belts. The way it is connected to and wound with the coil spring 2 is existing technology in this field and will not be described in detail here.
[0037] Specifically, such as Figures 1-2As shown, the rotating assembly includes a turntable 1 and a rotating support 3 coaxially arranged. The turntable 1 is fixedly connected to the rotating support 3, and the turntable 1 is rotatably connected to the outer casing 4. A space for accommodating a coil spring 2 is formed between the turntable 1 and the rotating support 3. The coil spring 2 is disposed between the turntable 1 and the rotating support 3, and is fixedly connected to the turntable 1. The diameter of the rotating support 3 is larger than the diameter of the turntable 1. A lower protrusion 31 is fixedly provided at the edge of the rotating support 3. The lower protrusion 31 is used to push the swing block 5 to slide on the outer casing 4. Setting the diameter of the rotating support 3 to be larger than the diameter of the turntable 1 and providing the lower protrusion 31 at the edge of the rotating support 3 to push the swing block 5 to slide on the outer casing 4 avoids interference between the movement of the lower protrusion 31 and the coil spring 2. During the unwinding process, the rotating component rotates along the first direction, and the lower protrusion 31 contacts the swing block 5 from one side and pushes the swing block 5 to slide. During the winding process, the rotating component rotates along the second direction, and the lower protrusion 31 contacts the swing block 5 from the other side and pushes the swing block 5 to slide. During this process, the swing block 5 contacts the limiting structure and is restricted from further sliding by the limiting structure, preventing the rotating component from continuing to rotate, thereby achieving locking after the unwinding length meets the requirement. Multiple lower protrusions 31 are provided, spaced apart circumferentially along the rotating bracket 3. For example, 6-12 lower protrusions 31 can be provided, evenly distributed circumferentially along the rotating bracket 3. In this embodiment, 6 lower protrusions 31 are provided. After the unwinding length meets the requirement, the external force is removed, and the coil spring 2 drives the rotating bracket 3 to rotate along the second direction. When the rotation angle is less than or equal to 60°, the lower protrusions 31 can push the swing block 5 to the limiting structure for limiting, reducing the winding length during the locking process. It is understandable that the more lower protrusions 31 there are, the smaller the maximum angle of rotation of the rotating bracket 3 in the second direction during the locking process, and the shorter the length of the winding during the locking process.
[0038] Furthermore, such as Figures 12-13 and refer to Figures 1-2As shown, the main body of the swing block 5 has an approximately fan-shaped structure. An upper protrusion 52 is fixedly installed on the side of the swing block 5 facing the rotating bracket 3, protruding from the surface of the swing block 5 in the direction of the rotating bracket 3. The upper protrusion 52 is used to contact the lower protrusion 31. When the rotating bracket 3 rotates along the first and second directions, the lower protrusion 31 of the rotating bracket 3 contacts both sides of the upper protrusion 52 respectively. A limiting shaft 53 and a sliding shaft 51 are fixedly installed on the side of the swing block 5 facing the outer shell 4. When the rotating assembly rotates along the second direction, the limiting structure can restrict the limiting shaft 53 from sliding on the outer shell 4. Correspondingly, a sliding seat 45 is also fixedly installed on the outer shell 4. The sliding seat 45 has a groove extending radially along the outer shell 4. The sliding shaft 51 is slidably connected to the groove, and the sliding shaft 51 can rotate within the groove. During the unwinding or winding process, the lower protrusion 31 drives and pushes the upper protrusion 52, causing the sliding block to slide on the outer shell 4, while simultaneously swinging around the sliding shaft 51. The winding and unwinding mechanism also includes an elastic element 6, which is mounted on the housing 4. The elastic element 6 abuts against the swing block 5 and is used to push the swing block 5 to slide radially inward along the housing 4. After the swing block 5 slides radially outward along the housing 4, it can be reset by the elastic element 6, avoiding manual operation. The housing 4 is also fixedly provided with two mounting seats 46. The elastic element 6 is a spring plate, and the two ends of the spring plate are respectively mounted on the two mounting seats 46. The swing block 5 abuts against the spring plate. In other embodiments, the elastic element 6 can also be set as a helical spring. The helical spring is set in the groove, and its two ends abut against the groove wall and the sliding shaft 51 respectively, which can also push the swing block 5 to slide radially inward along the housing 4.
[0039] Further, please refer to Figures 2-3 and combined Figures 4-11 As shown, the limiting structure includes a first limiting block 41 and a second limiting block 42. The first limiting block 41 has a guide groove 411, and the second limiting block 42 has a locking groove 421. The first limiting block 41 has a U-shaped structure, and the second limiting block 42 has a hook-shaped structure. The opening of the guide groove 411 is opposite to the opening of the locking groove 421, and the guide groove 411 extends toward the opening of the locking groove 421. The hook tail structure of the hook-shaped second limiting block 42 is located in the middle of the guide groove 411 of the first limiting block 41, and together with the first limiting block 41, forms a locking inlet 43. The extension direction of the hook tail structure and the hook tip structure of the second limiting block 42 is approximately perpendicular to the radial direction of the outer shell 4, and the hook tip structure of the second limiting block 42 is spaced apart from the first limiting block 41, forming a locking outlet 44. The locking outlet 44 communicates with the locking groove 421, and the width of the locking outlet 44 is greater than the diameter of the limiting shaft 53.
[0040] Specifically, please refer to Figure 4 and Figure 5 As shown, in the initial state, the limiting shaft 53 is not in contact with the first limiting block 41 and the second limiting block 42. Figure 6 As shown, during the wire feeding process, when the rotating assembly rotates in the first direction, the lower protrusion 31 pushes the upper protrusion 52, and the swing block 5 rotates around the rotating axis. At the same time, the limiting shaft 53 slides through the locking inlet 43 and then slides to the guide groove 411. Figure 7 As shown, at this time, the lower protrusion 31 and the upper protrusion 52 remain in contact. Under the force of the lower protrusion 31, the limiting shaft 53 continues to slide in the guide groove 411 along the extension direction of the guide groove 411 toward the locking groove 421 to one end close to the opening of the locking groove 421. At the same time, the sliding shaft 51 slides outward on the sliding seat 45, causing the swing block 5 to slide outward as a whole and compress the elastic element 6. After the lower protrusion 31 and the upper protrusion 52 disengage, the swing block 5 moves radially inward along the outer shell 4 under the elastic force of the elastic element 6. The rotating assembly continues to rotate in the first direction. The next lower protrusion 31 continues to contact the upper protrusion 52 and causes the swing block 5 to slide outward as a whole again until the wire length meets the requirements. Figure 8 As shown, after the required line length is met, the external force is removed. The rotating assembly rotates in the second direction under the elastic force of the coil spring 2, while the swing block 5 moves radially inward along the outer shell 4 under the elastic force of the elastic element 6. This allows the lower protrusion 31 to contact the other side of the upper protrusion 52, and the limiting shaft 53 to slide from the guide groove 411 into the locking groove 421. Due to the restriction of the hook tail structure of the second limiting block 42, the swing block 5 cannot continue to move inward. At this time, the lower protrusion 31 and the upper protrusion 52 still maintain contact and have a tendency to rotate in the second direction. Due to the restriction of the limiting shaft 53 by the hook tip structure of the second limiting block 42, the rotating assembly cannot continue to rotate in the second direction, thus achieving automatic locking after the line is laid to the required length. Figures 9-10 As shown, when winding the cable, since the rotating assembly cannot rotate in the second direction, the cable end is continued to be pulled, causing the rotating assembly to rotate in the first direction. The lower protrusion 31 contacts the upper protrusion 52 and pushes the limiting shaft 53 from the locking groove 421 to the locking outlet 44. At the same time, the swing block 5 moves outward as a whole, and the elastic element 6 continues to be compressed. Figure 11 As shown, after the external force is removed, the coil spring 2 drives the rotating assembly to rotate in the second direction, and the lower protrusion 31 contacts the upper protrusion 52. Since the limiting shaft 53 is located at the locking outlet 44 at this time, under the force of the lower protrusion 31, the swing block 5 swings along the sliding shaft 51 in a direction away from the first limiting block 41 and the second limiting block 42. Under the elastic force of the elastic element 6, the swing block 5 moves inward at the same time. At this time, the limiting shaft 53 does not contact the first limiting block 41 and the second limiting block 42, and no longer restricts the rotation of the rotating assembly in the second direction. The winding and unwinding mechanism is in the unlocked state, and the coil spring 2 can wind the wire normally. When the winding is finished, the winding mechanism returns to the initial state. During the unwinding, locking, unlocking, and resetting process, the movement trajectory of the limiting shaft 53 on the outer shell 4 is as follows: Figure 3 As shown by the dashed arrow, the first direction is as follows: Figures 4-7 as well as Figures 9-10 As shown by the arrow in the image, the second direction is as follows: Figure 8 and Figure 11 The arrow in the image indicates the direction.
[0041] This embodiment provides a wire winding and unwinding device, including the wire winding and unwinding mechanism described in this embodiment. The wire winding and unwinding device uses an electric device, a pneumatic device, a hydraulic device, or manual force as the external force source during the wire unwinding process. By setting up the wire winding and unwinding device in this embodiment, the operation of the wire winding and unwinding device is made simpler.
[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A winding and unwinding mechanism, characterized in that, include: The outer shell (4) is provided with a limiting structure; A rotating assembly, which is rotatably connected to the outer casing (4); A coil spring (2) is fixedly connected to the rotating assembly. The coil spring (2) is used for winding the wire. During the unwinding process, the rotating assembly rotates along a first direction and compresses the coil spring (2). During the winding process, the coil spring (2) drives the rotating assembly to rotate along a second direction. The first direction is opposite to the second direction. A swing block (5) is slidably disposed on the outer shell (4). The rotating assembly is used to push the swing block (5) to slide on the outer shell (4). When the rotating assembly rotates along the second direction, the limiting structure can restrict the swing block (5) from sliding on the outer shell (4).
2. The winding and unwinding mechanism according to claim 1, characterized in that, The rotating assembly includes a turntable (1) and a rotating bracket (3) arranged coaxially. The turntable (1) is fixedly connected to the rotating bracket (3). The turntable (1) is rotatably connected to the outer shell (4). A coil spring (2) is disposed between the turntable (1) and the rotating bracket (3). The coil spring (2) is fixedly connected to the turntable (1). The diameter of the rotating bracket (3) is larger than the diameter of the turntable (1). A lower protrusion (31) is fixedly disposed at the edge of the rotating bracket (3). The lower protrusion (31) is used to push the swing block (5) to slide on the outer shell (4).
3. The winding and unwinding mechanism according to claim 2, characterized in that, The lower protrusions (31) are provided in multiple ways, and the multiple lower protrusions (31) are arranged at circumferential intervals along the rotating bracket (3).
4. The winding and unwinding mechanism according to claim 2, characterized in that, The swing block (5) has an upper protrusion (52) fixedly provided on the side facing the rotating bracket (3), the upper protrusion (52) is used to contact the lower protrusion (31), and a limiting shaft (53) is fixedly provided on the side facing the outer shell (4). When the rotating assembly rotates along the second direction, the limiting structure can restrict the limiting shaft (53) from sliding on the outer shell (4).
5. The winding and unwinding mechanism according to claim 4, characterized in that, The outer shell (4) is also fixedly provided with a sliding seat (45), the sliding seat (45) is provided with a groove extending radially along the outer shell (4), and the side of the swing block (5) facing the outer shell (4) is also fixedly provided with a sliding shaft (51), the sliding shaft (51) is slidably connected to the groove, and the sliding shaft (51) can rotate in the groove.
6. The winding and unwinding mechanism according to claim 5, characterized in that, The winding and unwinding mechanism further includes an elastic element (6) which is mounted on the housing (4). The elastic element (6) abuts against the swing block (5) and is used to push the swing block (5) to slide radially inward along the housing (4).
7. The winding and unwinding mechanism according to claim 6, characterized in that, The outer shell (4) is also fixedly provided with two mounting seats (46), the elastic element (6) is a spring sheet, the two ends of the spring sheet are respectively mounted on the two mounting seats (46), and the swing block (5) abuts against the spring sheet.
8. The winding and unwinding mechanism according to claim 4, characterized in that, The limiting structure includes a first limiting block (41) and a second limiting block (42). The first limiting block (41) has a guide groove (411), and the second limiting block (42) has a locking groove (421). The opening of the guide groove (411) is opposite to the opening of the locking groove (421). The guide groove (411) extends toward the opening of the locking groove (421). When the rotating assembly rotates along the first direction, the limiting shaft (53) slides to the guide groove (411) and slides within the guide groove (411) to one end near the opening of the locking groove (421). When the rotating assembly rotates along the second direction, the limiting shaft (53) slides from the guide groove (411) into the locking groove (421).
9. The winding and unwinding mechanism according to claim 8, characterized in that, The first limiting block (41) and the second limiting block (42) form a locking outlet (44), which is connected to the locking groove (421). When the limiting shaft (53) is located in the locking groove (421) and the rotating assembly rotates in the first direction, the limiting shaft (53) slides from the locking groove (421) to the locking outlet (44).
10. A winding and unwinding device, characterized in that, Includes the winding and unwinding mechanism as described in any one of claims 1-9.