Cable intermediate joint sealing protection device for power transmission

Abstract

The invention discloses a sealing protection device for an intermediate joint of a cable for power transmission, relates to the technical field of sealing protection devices, solves the technical problem of sealing, and comprises a first protection cylinder and a second protection cylinder which are both internally provided with grooves. A fixing plate is fixedly installed at the corresponding ends of the first protection cylinder and the second protection cylinder, the fixing plate is fixedly installed in the groove, and sealing assemblies are arranged in the first protection cylinder and the second protection cylinder; the sealing assembly comprises a moving ring slidably mounted in the groove, an air bag is fixedly mounted on the side, away from the fixing plate, of the moving ring, an extrusion ring is fixedly mounted on the side, away from the air bag, of the moving ring, a sealing gasket is rotatably mounted at the end, away from the moving ring, of the extrusion ring, and a guide rod is slidably mounted on the moving ring in a penetrating mode. Sealing operation is facilitated, the sealing capacity of the device can be improved, and the safety protection capacity of the device can be improved.

Description

Technical Field

[0001] This invention relates to the field of sealing protection devices, and specifically to a sealing protection device for intermediate joints of power transmission cables. Background Technology

[0002] A cable is a device for transmitting electrical energy or signals, usually consisting of several or several groups of conductors. Cables are frequently used in the process of power transmission. During the laying of cables, joints are required, so joint protection devices are needed.

[0003] However, existing joint protection devices can only provide covering protection for the joint during use, which cannot achieve a sealing effect. This can easily lead to water ingress and electric leakage, making it difficult to provide sealing protection and affecting the sealing and safety protection capabilities of the device. Therefore, based on the shortcomings of the technology, a sealing protection device for intermediate joints of power transmission cables is proposed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a sealing and protection device for intermediate joints of power transmission cables, solving the following technical problems:

[0005] Generally, only a covering protection can be provided for the joint, which cannot achieve a sealing effect. This can easily lead to water ingress and electric leakage, making it difficult to provide sealing protection and affecting the sealing ability and safety protection capability of the device.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A sealing and protection device for intermediate joints of power transmission cables includes a first protective cylinder and a second protective cylinder. Both the first and second protective cylinders have grooves. A fixing plate is fixedly installed at one end of the first and second protective cylinders respectively. The fixing plate is fixedly installed in the groove. A sealing component is provided in the first and second protective cylinders.

[0008] The sealing assembly includes a movable ring slidably installed in a groove, an airbag fixedly installed on the side of the movable ring away from the fixed plate, a compression ring fixedly installed on the side of the movable ring away from the airbag, a sealing gasket rotatably installed on the end of the compression ring away from the movable ring, a guide rod slidably installed through the movable ring, a spring fixedly installed on the side of the movable ring near the fixed plate, and multiple L-shaped grooves opened on the outer surface of the first protective cylinder near the end of the second protective cylinder, and an extension plate with protrusions installed on the end of the second protective cylinder near the L-shaped grooves.

[0009] As a further embodiment of the present invention: the protrusion is fixedly installed on the end of the extension plate near the first protective cylinder, the protrusion is fixedly installed on the side of the extension plate near the fixed plate, and rubber sealing sleeves are fixedly installed on the ends of the second protective cylinder and the first protective cylinder away from the fixed plate.

[0010] As a further aspect of the present invention: a friction ring is fixedly installed on the outer surface of the second protective cylinder, the extension plate is fixedly installed on the side of the friction ring close to the first protective cylinder, and a plurality of friction strips are fixedly installed on the outer surface of the first protective cylinder.

[0011] As a further embodiment of the present invention: the end of the airbag away from the moving ring is fixedly installed on the inner wall of the groove, the guide rod is fixedly installed between the inner wall of the groove and the fixed plate, and the end of the spring away from the moving ring is fixedly installed on the fixed plate.

[0012] As a further embodiment of the present invention: the spring is nested on the outer surface of the guide rod, the outer surface of the extrusion ring is slidably attached to the inner surface of the fixing plate, and the protrusion is slidably installed in the L-shaped groove.

[0013] As a further aspect of the present invention: a limiting component is provided on the first protective cylinder, the limiting component including a plurality of storage slots formed on the outer surface of the first protective cylinder, an operating plate is slidably installed in the storage slots, a limiting rod is fixedly installed on the side of the operating plate near the L-shaped slot, an elastic plate is fixedly installed on the side of the operating plate away from the limiting rod, a balance rod is slidably installed on the operating plate, the two ends of the balance rod are fixedly installed in the storage slots, and a limiting hole is formed on the protrusion.

[0014] As a further aspect of the present invention: a pull ring is sleeved on the first protective cylinder, and a connecting post is fixedly installed between the pull ring and the operating plate.

[0015] As a further embodiment of the present invention: the end of the limiting rod away from the operating plate is slidably installed in the L-shaped groove, and the end of the elastic plate away from the operating plate is fixedly installed on the inner wall of the storage groove, and the limiting rod and the limiting hole are compatible.

[0016] As a further aspect of the present invention: an insulating component is provided on the second protective cylinder, the insulating component including a mounting block fixedly installed on the end of the second protective cylinder away from the first protective cylinder, a take-up roller rotatably mounted on the side of the mounting block near the first protective cylinder, an insulating film fixedly mounted on the take-up roller, an mounting plate fixedly mounted on the end of the insulating film away from the take-up roller, and locking blocks fixedly mounted on both ends of the mounting plate away from the insulating film, and multiple locking grooves are formed on the first and second protective cylinders at positions opposite to the locking blocks.

[0017] As a further embodiment of the present invention: an installation groove is provided in the installation block, the end of the take-up roller away from the insulating film rotates through the installation block and is fixedly installed with a limiting plate, a torsion spring is fixedly installed on the side of the limiting plate near the insulating film, the end of the torsion spring away from the limiting plate is fixedly installed on the inner wall of the installation groove, and the torsion spring is nested on the outer surface of the take-up roller.

[0018] The beneficial effects of this invention are:

[0019] The air bladder in the sealing assembly facilitates the compression force when the first and second protective cylinders are spliced ​​together, providing sealing protection for the cable, facilitating the sealing operation, improving the sealing capacity of the device, and enhancing the safety protection capability of the device.

[0020] The limiting rod in the limiting assembly is inserted into the limiting hole, which facilitates the limiting and fixing of the protrusion, and makes it convenient to install and disassemble the first protective cylinder and the second protective cylinder. This helps to improve the limiting and fixing capability of the device and improve the work efficiency of the device installation and disassembly.

[0021] The insulating film in the insulating assembly facilitates the splicing of the first and second protective cylinders, which helps to improve the protective capability of the device and enhance its sealing protection capability. Attached Figure Description

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of a sealing and protection device for intermediate joints of power transmission cables according to the present invention;

[0024] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0025] Figure 3 This is a schematic diagram of the internal structure of a sealing and protection device for intermediate joints of power transmission cables according to the present invention;

[0026] Figure 4 yes Figure 3 Enlarged structural diagram at point B;

[0027] Figure 5 yes Figure 3 Enlarged structural diagram at point C;

[0028] Figure 6 This is a schematic diagram of the sealing component in a sealing and protection device for intermediate joints of power transmission cables according to the present invention.

[0029] In the diagram: 1. First protective cylinder; 2. Second protective cylinder; 3. Fixing plate; 4. Sealing assembly; 41. Rubber sealing sleeve; 42. Moving ring; 43. Airbag; 44. Extrusion ring; 45. Sealing gasket; 46. Guide rod; 47. Spring; 48. L-shaped groove; 49. Extension plate; 410. Protrusion; 411. Friction ring; 412. Friction strip; 5. Limiting assembly; 51. Receiving groove; 52. Limiting rod; 53. Operating plate; 54. Balance rod; 55. Elastic plate; 56. Pull ring; 57. Connecting column; 58. Limiting hole; 6. Insulation assembly; 61. Mounting block; 62. Mounting groove; 63. Take-up roller; 64. Torsion spring; 65. Limiting plate; 66. Engaging groove; 67. Insulating film; 68. Mounting plate; 69. Engaging block. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1 - Figure 6 As shown, the present invention is a sealing and protection device for intermediate joints of power transmission cables, including a first protective cylinder 1 and a second protective cylinder 2. The first protective cylinder 1 and the second protective cylinder 2 are rotatably spliced ​​together to protect the cable joint. Both the first protective cylinder 1 and the second protective cylinder 2 are made of insulating material, which provides insulation protection. Grooves are provided inside the first protective cylinder 1 and the second protective cylinder 2. A fixing plate 3 is fixedly installed at one end of the first protective cylinder 1 and the second protective cylinder 2. The fixing plate 3 is fixedly installed in the groove. The groove is used to accommodate and install the airbag 43. A sealing component 4 is provided inside the first protective cylinder 1 and the second protective cylinder 2.

[0032] The sealing assembly 4 includes a movable ring 42 slidably mounted in a groove. An airbag 43 is fixedly mounted on the side of the movable ring 42 away from the fixed plate 3, and a compression ring 44 is fixedly mounted on the side of the movable ring 42 away from the airbag 43. The airbag 43 is compressed by the compression ring 44, which fills the gap between the first protective cylinder 1, the second protective cylinder 2, and the sleeved cable, thus achieving a sealing function. The airbag 43 is made of an elastic material and has insulating properties. A sealing gasket 45 is rotatably mounted on the end of the compression ring 44 away from the movable ring 42. The sealing gasket 45 seals the joint between the first protective cylinder 1 and the second protective cylinder 2. A guide rod 46 is slidably mounted through the movable ring 42, which guides and stabilizes the airbag 43. The function of airbag 43 is to ensure close contact between the airbag 43 and the cable, facilitating further positioning and fixing of the first protective cylinder 1 and the second protective cylinder 2 by the auxiliary rubber sealing sleeve 41. A spring 47 is fixedly installed on the side of the moving ring 42 near the fixing plate 3. Multiple L-shaped grooves 48 are formed on the outer surface of the first protective cylinder 1 near the second protective cylinder 2. An extension plate 49 with protrusions 410 is installed on the end of the second protective cylinder 2 near the L-shaped grooves 48. The protrusions 410 slide and engage within the L-shaped grooves 48, securing the first and second protective cylinders 1 and 2 for quick installation. The protrusions 410 are fixedly installed on the side of the extension plate 49 near the first protective cylinder 1 and the side of the extension plate 49 near the fixing plate 3. Both the protective sleeve 2 and the first protective sleeve 1 have rubber sealing sleeves 41 fixedly installed at their ends away from the fixing plate 3. The rubber sealing sleeves 41 further seal the gaps between the first and second protective sleeves 1 and the cable, and also limit and fix the first and second protective sleeves 1 and 2, minimizing their movement on the cable. A friction ring 411 is fixedly installed on the outer surface of the second protective sleeve 2. The friction ring 411 increases the friction between the operator and the second protective sleeve 2, facilitating the rotation of the second protective sleeve 2 on the first protective sleeve 1. It also facilitates the extension plate 49 driving the protrusion 410 to engage and move within the L-shaped groove 48. The extension plate 49 is fixedly installed on the side of the friction ring 411 closest to the first protective sleeve 1. Multiple friction strips 412 are fixedly installed on the outer surface of the first protective cylinder 1. The friction strips 412 increase the friction between the worker and the first protective cylinder 1. The end of the airbag 43 away from the moving ring 42 is fixedly installed on the inner wall of the groove. The guide rod 46 is fixedly installed between the inner wall of the groove and the fixed plate 3. The end of the spring 47 away from the moving ring 42 is fixedly installed on the fixed plate 3. The spring 47 is nested on the outer surface of the guide rod 46. The spring 47 drives the airbag 43 to elastically return to its original position. The outer surface of the compression ring 44 slides against the inner surface of the fixed plate 3. The compression ring 44 compresses the airbag 43 through the moving ring 42, facilitating the compression of the airbag 43 by the force of the first protective cylinder 1 and the second protective cylinder 2.The airbag 43 seals the internal spaces of the first protective cylinder 1 and the second protective cylinder 2, facilitating protection of the cable joint. The protrusion 410 slides axially into the L-shaped groove 48 and then rotates to achieve circumferential engagement, effectively locking and limiting the first and second protective cylinders 1 and 2. This facilitates sealing protection using the airbag 43 and the rubber sealing sleeve 41, simplifying the sealing operation, improving the sealing capability of the device, and enhancing its safety protection capabilities.

[0033] Please see Figure 1 - Figure 4 As shown, a limiting component 5 is provided on the first protective cylinder 1. The limiting component 5 includes multiple storage slots 51 formed on the outer surface of the first protective cylinder 1. An operating plate 53 is slidably installed in the storage slots 51. A limiting rod 52 is fixedly installed on the side of the operating plate 53 near the L-shaped groove 48. The limiting rod 52 is inserted into the limiting hole 58 and acts as a limiting and stabilizing protrusion 410. An elastic plate 55 is fixedly installed on the side of the operating plate 53 away from the limiting rod 52. The elastic plate 55 acts as a means to elastically reset the operating plate 53. A balance rod 54 is slidably installed on the operating plate 53. Both ends of the balance rod 54 are fixedly installed in the storage slots 51. The balance rod 54 acts as a balance guide. The operation plate 53 has a limiting hole 58 on the protrusion 410. A pull ring 56 is sleeved on the first protective cylinder 1. A connecting post 57 is fixedly installed between the pull ring 56 and the operation plate 53. The pull ring 56 can be connected to the connecting post 57 to control the synchronous movement of multiple operation plates 53 at the same time. The end of the limiting rod 52 away from the operation plate 53 is slidably installed in the L-shaped groove 48. The end of the elastic plate 55 away from the operation plate 53 is fixedly installed on the inner wall of the storage groove 51. The limiting rod 52 and the limiting hole 58 are compatible, which facilitates the limiting and fixing of the protrusion 410, facilitates installation and disassembly, improves the limiting and fixing ability of the device, and improves the work efficiency of device installation and disassembly.

[0034] Please see Figure 1 , Figure 3 and Figure 5As shown, an insulating component 6 is provided on the second protective cylinder 2. The insulating component 6 includes a mounting block 61 fixedly installed on the end of the second protective cylinder 2 away from the first protective cylinder 1. A take-up roller 63 is rotatably mounted on the side of the mounting block 61 close to the first protective cylinder 1. The mounting block 61 serves to mount the take-up roller 63. An insulating film 67 is fixedly installed on the take-up roller 63. The insulating film 67 is wrapped around the joint between the first protective cylinder 1 and the second protective cylinder 2, providing insulation and protection. Moreover, the wrapped insulating film 67 facilitates the secondary use of the second protective cylinder 2, minimizing the need for workers to wrap disposable insulating tape. The insulating film 67 is located away from the take-up roller 63. One end of the 3 is fixedly mounted with an mounting plate 68, which serves to pull the insulating film 67 around. At both ends of the mounting plate 68 away from the insulating film 67, locking blocks 69 are fixedly mounted. Multiple locking grooves 66 are formed on the first protective cylinder 1 and the second protective cylinder 2 opposite to the locking blocks 69. The locking blocks 69 are inserted into the locking grooves 66 and, under the torque of the torsion spring 64, facilitate the fastening of the insulating film 67 to the outer surface of the joint between the first protective cylinder 1 and the second protective cylinder 2. An mounting groove 62 is formed inside the mounting block 61. The end of the take-up roller 63 away from the insulating film 67 rotates through the mounting block 61 and is fixedly mounted with a limit plate 65, pulling out the insulating film 67. The process will drive the take-up roller 63 to rotate, which in turn twists the torsion spring 64, thus achieving the function of twisting the torsion spring 64. The torsion spring 64 is fixedly installed on the side of the limiting plate 65 near the insulating film 67, and the end of the torsion spring 64 away from the limiting plate 65 is fixedly installed on the inner wall of the mounting groove 62. The torsion spring 64 is nested on the outer surface of the take-up roller 63. The torsion spring 64 plays the role of driving the take-up roller 63 to rotate and wind up the insulating film 67, which facilitates insulation protection, improves the protection capability of the device, and improves the sealing protection capability of the device.

[0035] The working principle of this invention is as follows: First, the rubber sealing sleeves 41 on the first protective cylinder 1 and the second protective cylinder 2 are flipped open. Then, the first protective cylinder 1 and the second protective cylinder 2 are respectively placed on the two cables that need to be spliced. Then, the two cables are spliced ​​together. Then, the pull ring 56 is pulled, causing the pull ring 56 to slide on the first protective cylinder 1. At the same time, the pull ring 56 drives the operating plate 53 to slide in the receiving groove 51 through the connecting post 57. Simultaneously, the operating plate 53 slides on the balance bar 54 to compress the elastic plate 55, so that the elastic plate 55 is in a compressed state. The operating plate 53 causes the limiting rod 52 to retract into the receiving groove 51. Then, the friction strip 412 on the first protective cylinder 1 and the friction ring 411 on the second protective cylinder 2 are gripped, causing the first protective cylinder 1 and the second protective cylinder 2 to move relative to each other. At the same time, the friction ring 411 drives the protrusion 410 to slide in the L-shaped groove 48 through the extension plate 49. Then, the second protective cylinder 2 is slightly rotated, causing the friction ring 411 to drive the protrusion 410 to move in the L-shaped groove 48 to the position corresponding to the operating plate 53 through the extension plate 49. Finally, the pull ring 56 is released. The elastic restoring force of the elastic plate 55 drives the limiting rod 52 to slide into the limiting hole 58 via the operating plate 53. Simultaneously, the two sealing gaskets 45 are brought into contact with each other. Due to the continuous relative movement of the first protective cylinder 1 and the second protective cylinder 2, the sealing gaskets 45 reverse-pressure the compression ring 44. The compression ring 44 slides on the fixed plate 3, compressing the moving ring 42. The moving ring 42 slides on the guide rod 46, compressing the airbag 43. The airbag 43 is compressed and expanded, filling the gap between the cable and the first protective cylinder 1 and the second protective cylinder 2. Simultaneously, the moving ring 42... Pull the spring 47 to put it in a stretched state, and then reset and flip the rubber sealing sleeve 41. Resetting means fitting the initial state of the cable, so that the rubber sealing sleeve 41 and the cable are tightly fitted and sealed. Then pull the mounting plate 68, so that the mounting plate 68 drives the insulating film 67 to be pulled out from the winding roller 63, so that the winding roller 63 rotates on the mounting block 61. At the same time, the winding roller 63 drives the limiting plate 65 to twist the torsion spring 64. Then the pulled-out insulating film 67 is wrapped around the joint of the first protective cylinder 1 and the second protective cylinder 2. The insulating film 67 can be repeatedly wound. After the winding is completed, move the mounting plate 68 to drive the locking block 69 to be inserted into the locking groove 66. The torque of the torsion spring 64 drives the winding roller 63 to wrap and tighten the insulating film 67, so that the insulating film 67 is wrapped around the outer surface of the first protective cylinder 1 and the second protective cylinder 2.

[0036] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A sealing and protection device for intermediate joints of power transmission cables, comprising a first protective cylinder (1) and a second protective cylinder (2), characterized in that: The first protective cylinder (1) and the second protective cylinder (2) are both provided with grooves. A fixing plate (3) is fixedly installed at one end of the first protective cylinder (1) and the second protective cylinder (2). The fixing plate (3) is fixedly installed in the groove. A sealing component (4) is provided in the first protective cylinder (1) and the second protective cylinder (2). The sealing assembly (4) includes a movable ring (42) slidably installed in the groove. An airbag (43) is fixedly installed on the side of the movable ring (42) away from the fixed plate (3). A compression ring (44) is fixedly installed on the side of the movable ring (42) away from the airbag (43). A sealing gasket (45) is rotatably installed on the end of the compression ring (44) away from the movable ring (42). A guide rod (46) is slidably installed through the movable ring (42). A spring (47) is fixedly installed on the side of the movable ring (42) near the fixed plate (3). A plurality of L-shaped grooves (48) are opened on the outer surface of the first protective cylinder (1) near the end of the second protective cylinder (2). An extension plate (49) with a protrusion (410) is installed on the end of the second protective cylinder (2) near the L-shaped groove (48).

2. The sealing and protection device for intermediate joints of power transmission cables according to claim 1, characterized in that: The protrusion (410) is fixedly installed on one end of the extension plate (49) near the first protective cylinder (1). The protrusion (410) is fixedly installed on one side of the extension plate (49) near the fixed plate (3). Rubber sealing sleeves (41) are fixedly installed on the ends of the second protective cylinder (2) and the first protective cylinder (1) away from the fixed plate (3).

3. The sealing and protection device for intermediate joints of power transmission cables according to claim 2, characterized in that: A friction ring (411) is fixedly installed on the outer surface of the second protective cylinder (2), and the extension plate (49) is fixedly installed on the side of the friction ring (411) close to the first protective cylinder (1). A plurality of friction strips (412) are fixedly installed on the outer surface of the first protective cylinder (1).

4. The sealing and protection device for intermediate joints of power transmission cables according to claim 1, characterized in that: The airbag (43) is fixedly installed on the inner wall of the groove at one end away from the moving ring (42), the guide rod (46) is fixedly installed between the inner wall of the groove and the fixed plate (3), and the spring (47) is fixedly installed on the fixed plate (3) at one end away from the moving ring (42).

5. A sealing and protection device for intermediate joints of power transmission cables according to claim 4, characterized in that: The spring (47) is nested on the outer surface of the guide rod (46), the outer surface of the compression ring (44) slides against the inner surface of the fixing plate (3), and the protrusion (410) slides in the L-shaped groove (48).

6. A sealing and protection device for intermediate joints of power transmission cables according to claim 1, characterized in that: A limiting component (5) is provided on the first protective cylinder (1). The limiting component (5) includes a plurality of storage slots (51) opened on the outer surface of the first protective cylinder (1). An operating plate (53) is slidably installed in the storage slot (51). A limiting rod (52) is fixedly installed on the side of the operating plate (53) near the L-shaped groove (48). An elastic plate (55) is fixedly installed on the side of the operating plate (53) away from the limiting rod (52). A balance rod (54) is slidably installed on the operating plate (53). Both ends of the balance rod (54) are fixedly installed in the storage slot (51). A limiting hole (58) is opened on the protrusion (410).

7. A sealing and protection device for intermediate joints of power transmission cables according to claim 6, characterized in that: A pull ring (56) is fitted on the first protective cylinder (1), and a connecting post (57) is fixedly installed between the pull ring (56) and the operating plate (53).

8. A sealing and protection device for intermediate joints of power transmission cables according to claim 7, characterized in that: The end of the limiting rod (52) away from the operating plate (53) is slidably installed in the L-shaped groove (48), and the end of the elastic plate (55) away from the operating plate (53) is fixedly installed on the inner wall of the storage groove (51). The limiting rod (52) and the limiting hole (58) are compatible.

9. A sealing and protection device for intermediate joints of power transmission cables according to claim 1, characterized in that: An insulating component (6) is provided on the second protective cylinder (2). The insulating component (6) includes a mounting block (61) fixedly installed on the end of the second protective cylinder (2) away from the first protective cylinder (1). A take-up roller (63) is rotatably installed on the side of the mounting block (61) close to the first protective cylinder (1). An insulating film (67) is fixedly installed on the take-up roller (63). An mounting plate (68) is fixedly installed on the end of the insulating film (67) away from the take-up roller (63). Locking blocks (69) are fixedly installed at both ends of the mounting plate (68) on the side away from the insulating film (67). Multiple locking grooves (66) are opened on the first protective cylinder (1) and the second protective cylinder (2) at positions opposite to the locking blocks (69).

10. A sealing and protection device for intermediate joints of power transmission cables according to claim 9, characterized in that: The mounting block (61) has a mounting groove (62) inside. The end of the take-up roller (63) away from the insulating film (67) rotates through the mounting block (61) and is fixedly mounted with a limiting plate (65). A torsion spring (64) is fixedly mounted on the side of the limiting plate (65) near the insulating film (67). The end of the torsion spring (64) away from the limiting plate (65) is fixedly mounted on the inner wall of the mounting groove (62). The torsion spring (64) is nested on the outer surface of the take-up roller (63).

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