Adjustable spline shaft tail manufacturing and middle connecting device of butt-splicing roller shutter

Abstract

The utility model discloses an adjustable spline shaft tail and middle connection device of a butt-joint roller shutter, the adjustable spline shaft tail of the butt-joint roller shutter comprises an adjusting end cover, a tail base, a locking device and a mandrel, one end of the tail base is open, the adjusting end cover is arranged at the open end of the tail base, the mandrel and the locking device are arranged in the tail base, and the locking device is arranged in the tail base. One end of the core shaft penetrates through the adjusting end cover and the tail manufacturing base, and the core shaft is axially fixed with the adjusting end cover; the adjusting end cover, the tail manufacturing base and the mandrel are all connected with the locking device; the locking device at least has a locking state and an unlocking state, and when the locking device is in the locking state, the tail making base and the mandrel are fixed in the circumferential direction; when the adjusting end cover is rotated, the locking device enters an unlocking state, the tail control base can rotate relative to the mandrel, and the mandrel and the adjusting end cover rotate in opposite directions.

Description

Technical Field

[0001] The utility model relates to an adjustable spline shaft tail and center connection device for a spliced ​​roller blind. Background Art

[0002] A specially designed roller blind is suitable for large-span windows or door openings. By splicing two or more roller blinds together, it provides large-area shading, heat insulation, and privacy protection. A splined hub and tail assembly connect and stabilize the two or more roller blinds, ensuring synchronization, flatness, and stability during deployment, retraction, and operation.

[0003] However, the existing central link device cannot adjust the height of a single roller blind after installation. Therefore, the height of the roller blind needs to be aligned before installation. After installation, as the use time increases, the roller blind fabric will expand and contract, causing the heights of multiple roller blinds to be inconsistent, affecting the appearance of use. Utility Model Content

[0004] The purpose of the utility model is to provide an adjustable spline shaft tail and center connection device for a spliced ​​roller blind, so as to solve the technical problems mentioned in the above background technology.

[0005] The technical solution for achieving the purpose of the utility model is: an adjustable spline shaft tail for a spliced ​​roller blind, comprising an adjusting end cover, a tail base, a locking device and a core shaft, one end of the tail base is open, the adjusting end cover is arranged at the open end of the tail base, the core shaft and the locking device are arranged in the tail base, one end of the core shaft passes through the adjusting end cover, the tail base and the core shaft are axially fixed to the adjusting end cover; the adjusting end cover, the tail base and the core shaft are all connected to the locking device; the locking device has at least a locked state and an unlocked state, and when the locking device is in the locked state, the tail base and the core shaft are locked. Circumferentially fixed; when the adjusting end cover is rotated, the locking device enters an unlocked state, the tail control base can rotate relative to the core shaft, and the core shaft and the adjusting end cover rotate in opposite directions; the locking device includes a first locking plate and a second locking plate, and the first locking plate and the second locking plate are both matched with the adjusting end cover and the core shaft. When the locking device is in a locked state, the first locking plate and the second locking plate respectively limit the core shaft from rotating in two directions; when the adjusting end cover is rotated, the adjusting end cover pushes the first locking plate or the second locking plate, the locking device enters an unlocked state, and the core shaft can rotate in the opposite direction to push the other locking plate.

[0006] Furthermore, the locking device also includes a slider fixing block, the first locking piece and the second locking piece both cooperate with the adjusting end cover and the core shaft, the slider fixing block is clamped with the tail control base, and the slider fixing block is provided with a first sliding groove for the first locking piece and the second locking piece to move, and the core shaft is located in the tail control base. A circle of tooth grooves is provided on the outer circumferential surface of one end. When the locking device is in a locked state, one end of the first locking piece and the second locking piece is clamped in the tooth groove; when the adjusting end cover is rotated, the adjusting end cover pushes the first locking piece or the second locking piece into the first sliding groove, the locking device enters the unlocked state, and the core shaft rotates in the opposite direction to push the other locking piece into the first sliding groove.

[0007] Furthermore, the first locking plate and the second locking plate are symmetrically arranged and are both arc-shaped. A protrusion extends from the other end of the first locking plate and the second locking plate that is not engaged in the tooth groove toward one side of the adjustment end cover, and the adjustment end cover is provided with a second sliding groove that cooperates with the protrusion.

[0008] Furthermore, the locking device further includes a reset member disposed in the slider fixing block, and the reset member cooperates with the first locking piece and the second locking piece.

[0009] Furthermore, the slider fixing block is arranged in the tail-control base, a groove is arranged on the outer side of the slider fixing block, and a limiting strip matching the groove is arranged on the inner side wall of the tail-control base.

[0010] Furthermore, it also includes a pin, and a boss is provided on the side of the adjustment end cover facing the tail control base, the boss is embedded in the tail control base and abuts against the slider fixing block, a limiting hole is provided on the tail control base, and a circle of limiting grooves is provided on the outer peripheral surface of the boss, and the pin passes through the limiting hole and is slidably connected to the limiting groove.

[0011] Furthermore, a limiting step is provided on the outer peripheral surface of the core shaft, and the limiting step cooperates with the adjustment end cover.

[0012] Furthermore, a positioning bead is provided on a surface of the tail-control base facing the adjustment end cover, and a positioning groove cooperating with the positioning bead is provided on the adjustment end cover.

[0013] A central connecting device for a spliced ​​roller blind comprises a spline sleeve tail and a spline shaft tail, the spline sleeve tail and the spline shaft tail being respectively arranged at the ends of adjacent spliced ​​roller blinds, the spline sleeve tail and the spline shaft tail being snap-connected; the spline sleeve tail comprises a core shaft sleeve, the core shaft is snap-connected to the core shaft sleeve; the core shaft sleeve is retractable.

[0014] Furthermore, the spline sleeve tailing system also includes a thumbwheel and a tailing base, the tailing base and the core shaft sleeve are circumferentially fixed and axially slide relative to each other, the thumbwheel is rotatably connected to the tailing base and axially fixed; the thumbwheel is provided with an arc-shaped clamping platform, and the core shaft sleeve is provided with a clamping strip that cooperates with the arc-shaped clamping platform.

[0015] By adopting the above technical solution, the utility model has the following beneficial effects:

[0016] (1) The spline shaft tail of the utility model is provided with a locking device, which is in a locked state during normal use, and is locked in both directions. The adjustment end cover and the tail base are circumferentially fixed to the core shaft; when the height of the roller blind needs to be adjusted, the adjustment end cover can be rotated to rotate the core shaft in the opposite direction, which is convenient for adjusting the height of the roller blind. Whether during installation or in later maintenance, the height of the roller blind can be easily aligned, making the appearance of the spliced ​​roller blind more beautiful.

[0017] (2) The locking device of the present invention adopts a symmetrically arranged first locking plate and a second locking plate to respectively lock the rotation of the core shaft in two directions. When it is necessary to enter the unlocked state, one of the locking plates is unlocked by rotating the adjustment end cover, and the core shaft can then rotate in the opposite direction to push the other locking plate.

[0018] (3) The arrangement of the locking plate of the present invention enables the core shaft to rotate in only one direction when the locking device enters the unlocked state, while the other direction remains in the locked state.

[0019] (4) The locking device of the present invention is provided with a reset member, which always provides a force for resetting the first locking plate and the second locking plate, thereby preventing the locking plate from staying in the first sliding groove after entering the first sliding groove and being unable to cooperate with the core shaft.

[0020] (5) The tail-control base of the present invention is provided with a positioning bead on the side facing the adjustment end cover, and the adjustment end cover is provided with a positioning groove that cooperates with the positioning bead. There are three positioning grooves, corresponding to three gears, namely locking, upper adjustment and lower adjustment. In the three gears, the positioning bead is stuck in the corresponding positioning groove to prevent the locking plate from being pushed back to the locked state under the action of the reset member when adjusting.

[0021] (6) The dial wheel of the spline sleeve tail system of the present invention is provided with an arc-shaped clamping platform, and the core shaft sleeve is provided with a clamping strip that matches the arc-shaped clamping platform. By rotating the dial wheel, the core shaft sleeve is extended and retracted, which facilitates the clamping and installation between the spline sleeve tail system and the spline shaft tail system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein

[0023] Figure 1 It is a structural schematic diagram of the spline shaft tail of the utility model.

[0024] Figure 2 This is a structural schematic diagram of the spline shaft tail of the utility model from another angle.

[0025] Figure 3 It is a structural schematic diagram of the tail-control base of the present utility model.

[0026] Figure 4 It is a structural schematic diagram of the locking device of the present utility model.

[0027] Figure 5 This is a structural schematic diagram of the locking device of the present invention from another angle.

[0028] Figure 6 It is a side sectional view of the present utility model.

[0029] Figure 7 This is a schematic diagram of the matching structure of the locking plate, the adjusting end cover and the core shaft of the utility model.

[0030] Figure 8 It is a structural schematic diagram of the first locking piece and the second locking piece of the utility model.

[0031] Figure 9 It is a structural schematic diagram of the spline sleeve tail of the utility model.

[0032] Figure 10 This is a schematic diagram of the thumbwheel structure of the present utility model.

[0033] Figure 11 It is a structural schematic diagram of the core shaft sleeve of the utility model.

[0034] Figure 12 It is a structural schematic diagram of the spline shaft tail, spline sleeve tail and central connecting bracket of the present invention.

[0035] Figure 13 This is a structural diagram of the suspension baffle of the central coupling device of the present invention.

[0036] The numbers in the accompanying drawings are: adjusting end cover 1, second slide groove 1-1, boss 1-2, limiting groove 1-2-1, positioning groove 1-3, notch 1-4, tail base 2, limiting strip 2-1, limiting hole 2-2, positioning bead 2-3, gear mark 2-4, locking device 3, slider fixing block 3-1, first slide groove 3-1-1, groove 3-1-2, first locking piece 3-2, boss 3-2-1, second locking piece 3-3, core shaft 4, tooth groove 4-1, limiting step 4-2, pin 5, core shaft sleeve 6, clamping strip 6-1, dial wheel 7, arc-shaped clamping table 7-1, clamping table groove 7-1-1, and central bracket 8. DETAILED DESCRIPTION

[0037] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0041] In the description of the embodiments of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The present invention is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0043] (Example 1)

[0044] See Figure 1-8 The adjustable spline shaft tail of the spliced ​​roller shutter of this embodiment includes an adjusting end cover 1, a tail base 2, a locking device 3 and a core shaft 4. One end of the tail base 2 is open, and the adjusting end cover 1 is arranged at the open end of the tail base 2. The core shaft 4 and the locking device 3 are arranged in the tail base 2, and one end of the core shaft 4 passes through the adjusting end cover 1, and the tail base 2 and the core shaft 4 are axially fixed to the adjusting end cover 1; the adjusting end cover 1, the tail base 2 and the core shaft 4 are all connected to the locking device 3; the locking device 3 has at least a locked state and an unlocked state. When the locking device 3 is in the locked state, the tail base 2 and the core shaft 4 are circumferentially fixed; when the adjusting end cover 1 is rotated, the locking device 3 enters the unlocked state, the tail base 2 can rotate relative to the core shaft 4, and the core shaft 4 and the adjusting end cover 1 rotate in the opposite direction.

[0045] For details, see Figure 4-5 The locking device 3 includes a slider fixing block 3-1, a first locking piece 3-2, a second locking piece 3-3 and a reset piece (not shown in the figure). The first locking piece 3-2 and the second locking piece 3-3 are symmetrically arranged and are both arc-shaped. Figure 7 A circle of tooth grooves 4-1 is provided on the outer peripheral surface of one end of the core shaft 4 located in the tail base 2, and one end of the first locking piece 3-2 and the second locking piece 3-3 is snapped into the tooth groove 4-1 and cooperates with the core shaft 4, and a protrusion 3-2-1 extends from the other end of the first locking piece 3-2 and the second locking piece 3-3 that is not snapped into the tooth groove 4-1 toward the side of the adjustment end cover 1, and a second sliding groove 1-1 that cooperates with the protrusion 3-2-1 is provided on the adjustment end cover 1. The slider fixing block 3-1 is engaged with the tail control base 2. The slider fixing block 3-1 is provided with a first slot 3-1-1 for the first and second locking plates 3-2, 3-3 to move. When the locking device 3 is locked, one end of the first and second locking plates 3-2, 3-3 engages with the tooth groove 4-1. When the adjustment end cover 1 is rotated, the adjustment end cover 1, through the cooperation of the second slot 1-1 and the protrusion 3-2-1, pushes the first or second locking plate 3-2, 3-3 into the first slot 3-1-1, and the locking device 3 enters the unlocked state. The spindle 4 rotates in the opposite direction to push the other locking plate into the first slot 3-1-1. The reset member cooperates with the first and second locking plates 3-2, 3-3 to continuously provide a force to reset the first and second locking plates 3-2, 3-3, and prevent the locking plates from entering the first slot 3-1-1 and remaining there, unable to engage with the spindle 4. In this embodiment, two first locking pieces 3 - 2 and two second locking pieces 3 - 3 are provided.

[0046] The slider fixing block 3-1 is arranged in the tail control base 2, the outer side of the slider fixing block 3-1 is provided with a groove 3-1-2, and the inner side wall of the tail control base 2 is provided with a limiting strip 2-1 matching the groove 3-1-2.

[0047] See Figure 6 The spline shaft tailing also includes a pin 5. A boss 1-2 is provided on the side of the adjusting end cover 1 facing the tailing base 2. The boss 1-2 is embedded in the tailing base 2 and abuts against the slider fixing block 3-1. A limiting hole 2-2 is provided on the tailing base 2. A circle of limiting grooves 1-2-1 is provided on the outer circumference of the boss 1-2. The pin 5 passes through the limiting hole 2-2 and is slidably connected to the limiting groove 1-2-1, so that the axial direction will not be separated when the adjusting end cover 1 and the tailing base 2 rotate relative to each other.

[0048] A limiting step 4 - 2 is provided on the outer circumferential surface of the core shaft 4 , and the limiting step 4 - 2 cooperates with the adjustment end cover 1 to ensure that the core shaft 4 and the adjustment end cover 1 are axially fixed.

[0049] The side of the tail control base 2 facing the adjustment end cap 1 is provided with positioning beads 2-3, and the adjustment end cap 1 is provided with positioning grooves 1-3 that cooperate with the positioning beads 2-3. In this embodiment, there are three positioning grooves 1-3, corresponding to three gear positions: locking, upward adjustment, and downward adjustment. In each of the three gear positions, the positioning beads 2-3 are locked in the corresponding positioning grooves 1-3, preventing the locking plate from being pushed back into the locked state by the reset member during adjustment. To more intuitively observe the three gear positions, gear position markings 2-4 are provided on the tail control base 2, and notches 1-4 are provided on the adjustment end cap 1 to observe the gear position markings 2-4.

[0050] For ease of understanding, combined Figure 2 The working method of this embodiment is explained as follows: when the gear of the adjustment end cover 1 is locked, one end of the first locking piece 3-2 and the second locking piece 3-3 are both stuck in the tooth groove 4-1 of the core shaft 4. At this time, the core shaft 4 cannot rotate relative to the tail control base 2. When the adjustment end cover 1 rotates counterclockwise, the second sliding groove 1-1 on the adjustment end cover 1 drives the second locking piece 3-3 to disengage from the tooth groove 4-1. Although the reset member exerts force on the second locking piece 3-3, the positioning bead 2-3 is now stuck in the positioning groove 1-3, preventing the second locking piece 3-3 from returning to the tooth groove 4-1. The first locking piece 3-2 is still stuck in the tooth groove 4-1 due to the action of the reset member. At this time, the core shaft 4 can rotate clockwise to push the first locking piece 3-2, but cannot rotate counterclockwise, achieving one-way locking during adjustment.

[0051] (Example 2)

[0052] See Figure 9-11A central connecting device for a spliced ​​roller shutter includes a spline sleeve tail and a spline shaft tail. The spline sleeve tail and the spline shaft tail are respectively arranged at the ends of adjacent spliced ​​roller shutters, and the spline sleeve tail and the spline shaft tail are clamped together; the spline sleeve tail includes a core shaft sleeve 6, and the core shaft 4 is clamped together with the core shaft sleeve 6; the core shaft sleeve 6 is retractable.

[0053] Specifically, the spline sleeve tail system also includes a thumbwheel 7 and a tail system base 2. The tail system base 2 and the core shaft sleeve 6 are fixed in the circumferential direction and slide relative to each other in the axial direction. The thumbwheel 7 is rotatably connected to the tail system base 2 and is axially fixed. An arc-shaped clamping platform 7-1 is provided on the thumbwheel 7, and a clamping strip 6-1 that cooperates with the arc-shaped clamping platform 7-1 is provided on the core shaft sleeve 6. By rotating the thumbwheel 7, the core shaft sleeve 6 is extended and retracted, which facilitates the clamping and installation between the spline sleeve tail system and the spline shaft tail system. A clamping platform groove 7-1-1 is provided in the middle of the arc-shaped clamping platform 7-1. When the clamping strip 6-1 enters the clamping platform groove 7-1-1, the core shaft sleeve 6 and the tail system base 2 are relatively fixed. An outside person needs to apply a certain force to rotate the thumbwheel 7 so that the clamping strip 6-1 will be separated from the clamping platform groove 7-1-1.

[0054] (Example 3)

[0055] See Figure 12-13 Compared to Example 2, this embodiment includes a central support bracket 8. A connection hole is provided in the center of the central support bracket 8, through which the tail of the spline sleeve passes. The central support bracket 8 supports and secures the central support assembly, making the connection and operation of the central support assembly more stable. Furthermore, a hook is provided on the outside of the central support bracket 8, which can be used to hang a baffle for shielding the roller shutter head rail, making the appearance more aesthetically pleasing.

[0056] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is 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 in the scope of protection of the present invention.

Claims

1. An adjustable spline shaft tail for a double-jointed roller blind, characterized by: The invention comprises an adjusting end cover (1), a tail-control base (2), a locking device (3) and a core shaft (4); one end of the tail-control base (2) is open, the adjusting end cover (1) is arranged at the open end of the tail-control base (2), the locking device (3) is arranged in the tail-control base (2), one end of the core shaft (4) passes through the adjusting end cover (1), the tail-control base (2) and the core shaft (4) are all axially fixed to the adjusting end cover (1); the adjusting end cover (1), the tail-control base (2) and the core shaft (4) are all connected to the locking device (3); the locking device (3) has at least a locked state and an unlocked state, and when the locking device (3) is in the locked state, the tail-control base (2) and the core shaft (4) are circumferentially fixed; When the adjusting end cover (1) is rotated, the locking device (3) enters an unlocked state, the tail control base (2) can rotate relative to the core shaft (4), and the core shaft (4) and the adjusting end cover (1) rotate in opposite directions; the locking device (3) comprises a first locking piece (3-2) and a second locking piece (3-3), the first locking piece (3-2) and the second locking piece (3-3) both cooperate with the adjusting end cover (1) and the core shaft (4), and when the locking device (3) is in a locked state, the first locking piece (3-2) and the second locking piece (3-3) respectively limit the core shaft (4) from rotating in two directions; when the adjusting end cover (1) is rotated, the adjusting end cover (1) pushes the first locking piece (3-2) or the second locking piece (3-3), the locking device (3) enters an unlocked state, and the core shaft (4) can rotate in opposite directions to push the other locking piece.

2. The adjustable spline shaft tail system for a double-jointed roller blind according to claim 1, characterized in that: The locking device (3) further comprises a slider fixing block (3-1), the slider fixing block (3-1) being clamped with the tail control base (2), the slider fixing block (3-1) being provided with a first sliding groove (3-1-1) for the first locking piece (3-2) and the second locking piece (3-3) to move, and the core shaft (4) being provided with a circle of tooth grooves (4-1) on the outer peripheral surface of one end thereof located in the tail control base (2); when the locking device (3) is in a locked state, one end of the first locking piece (3-2) and the second locking piece (3-3) is clamped in the tooth grooves (4-1); when the adjusting end cover (1) is rotated, the adjusting end cover (1) pushes the first locking piece (3-2) or the second locking piece (3-3) into the first sliding groove (3-1-1), the locking device (3) enters an unlocked state, and the core shaft (4) rotates in the opposite direction to push the other locking piece into the first sliding groove (3-1-1).

3. The adjustable spline shaft tail system for a double-jointed roller blind according to claim 2, characterized in that: The first locking piece (3-2) and the second locking piece (3-3) are symmetrically arranged and both are arc-shaped. A protrusion (3-2-1) extends from the other end of the first locking piece (3-2) and the second locking piece (3-3) that is not engaged in the tooth groove (4-1) toward one side of the adjustment end cover (1). The adjustment end cover (1) is provided with a second sliding groove (1-1) that cooperates with the protrusion (3-2-1).

4. The adjustable spline shaft tail system for a double-jointed roller blind according to claim 2, characterized in that: The locking device (3) further comprises a reset member arranged in the slider fixing block (3-1), and the reset member cooperates with the first locking piece (3-2) and the second locking piece (3-3).

5. The adjustable spline shaft tail system for a double-jointed roller blind according to claim 2, characterized in that: The slider fixing block (3-1) is arranged in the tail control base (2), the outer side surface of the slider fixing block (3-1) is provided with a groove (3-1-2), and the inner side wall of the tail control base (2) is provided with a limiting strip (2-1) matching the groove (3-1-2).

6. The adjustable spline shaft tail system for a double-jointed roller blind according to claim 2, characterized in that: The adjusting end cover (1) is provided with a boss (1-2) on one side facing the tail control base (2), the boss (1-2) is embedded in the tail control base (2) and abuts against the slider fixing block (3-1), a limiting hole (2-2) is provided on the tail control base (2), a circle of limiting grooves (1-2-1) is provided on the outer peripheral surface of the boss (1-2), and the pin (5) passes through the limiting hole (2-2) and is slidably connected to the limiting groove (1-2-1).

7. The adjustable spline shaft tail system for a double-jointed roller blind according to claim 1, characterized in that: A limiting step (4-2) is provided on the outer peripheral surface of the core shaft (4), and the limiting step (4-2) cooperates with the adjusting end cover (1).

8. The adjustable spline shaft tail system for a double-jointed roller blind according to claim 1, characterized in that: A positioning bead (2-3) is provided on the side of the tail control base (2) facing the adjustment end cover (1), and a positioning groove (1-3) cooperating with the positioning bead (2-3) is provided on the adjustment end cover (1).

9. A central connecting device for a double-jointed roller blind, characterized by: The invention comprises a spline sleeve tail and a spline shaft tail as described in any one of claims 1 to 8, wherein the spline sleeve tail and the spline shaft tail are respectively arranged at the ends of adjacent joined roller blinds, and the spline sleeve tail and the spline shaft tail are snap-connected; the spline sleeve tail comprises a core shaft sleeve (6), and the core shaft (4) is snap-connected to the core shaft sleeve (6); the core shaft sleeve (6) is retractable.

10. The central connecting device for a double-jointed roller blind according to claim 9, characterized in that: The spline sleeve tail control system further comprises a thumbwheel (7) and a tail control base (2); the tail control base (2) and the core shaft sleeve (6) are circumferentially fixed and axially slide relative to each other; the thumbwheel (7) and the tail control base (2) are rotationally connected and axially fixed; an arc-shaped clamping platform (7-1) is provided on the thumbwheel (7); and a clamping strip (6-1) that matches the arc-shaped clamping platform (7-1) is provided on the core shaft sleeve (6).

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