A lockable roller shutter tail piece

Abstract

This utility model relates to a lockable roller shutter tail control component, including a tail control shaft, a sliding shaft, and a deflector wheel. The sliding shaft is slidably mounted on the tail control shaft, and the deflector wheel is rotatably connected to the tail control shaft. The deflector wheel is drively connected to the sliding shaft, and its rotation drives the sliding shaft to slide. At least two locking portions are formed on the deflector wheel, arranged around the rotation axis of the deflector wheel on the outer side of the circumferential surface of the tail control shaft, with a positioning space formed between adjacent locking portions. It also includes a locking member, which is slidably mounted on the tail control shaft. The sliding direction of the locking member is radially arranged along the tail control shaft. The locking member is inserted into and clamped in the positioning space by sliding, so that the tail control shaft and the deflector wheel are positioned relative to each other in the circumferential direction. This utility model has the advantages of simple structure, reasonable design, convenient operation, and high safety.

Description

Technical Field

[0001] This utility model relates to the technical field of window decoration components, and in particular to a lockable roller blind tail piece. Background Technology

[0002] The two ends of existing roller blinds are rotatably mounted on the mounting base via tail pieces. In order to facilitate the installation and removal of roller blinds, some tail pieces with telescopic functions have appeared on the market. These tail pieces are equipped with telescopic shafts and actuating wheels for controlling the telescopic movement of the shafts. When the roller blind is rolled up or down, the blind can easily drag the actuating wheels to rotate, causing the shafts to retract and disengage from the mounting base on the wall, resulting in the roller blind falling and posing a safety hazard.

[0003] To address the aforementioned technical issues, some tail-locking components with locking functions have emerged on the market, such as the Chinese invention patent application CN113668999A entitled "A Roller Shutter Balance Self-Locking Tail-Lock Assembly." This solution includes a dial, a telescopic component, a compression spring, a tail-locking housing, and a self-locking component. The dial is located at one end of the tail-locking housing. The telescopic component is slidably connected to the inner side of the tail-locking housing, with one end of the telescopic component passing through the dial and a connecting shaft at one end. The compression spring is located inside the tail-locking housing, with one end abutting against the telescopic component. When the dial is rotated, the telescopic component drives the connecting shaft to slide axially. The self-locking component is movably connected to the tail-locking housing. The outer side of the dial has at least one slot, and the self-locking component has a locking tongue that matches the slot. One end of the tail-end housing has an outwardly extending annular mounting portion with a boss. One end of the self-locking component has a mating hole that engages with the boss. The other end of the self-locking component has a latch, and the annular mounting portion has a matching buckle. The annular mounting portion also has a limiting portion, with the outer side of the locking tongue slidingly engaging with the limiting portion. In use, the self-locking component rotates around the boss as an axis. By rotating towards the axis of the tail-end housing, the locking tongue engages with the slot of the derailleur, locking the tail-end housing and the derailleur. This locking method, which switches states by rotation, is cumbersome and results in a large external contact surface for the self-locking component, increasing the risk of it being dragged by the curtain, thus reducing security. Furthermore, the locking direction of the self-locking component is from the outside to the inside of the tail-end housing. When the blind rotates at high speed, the centrifugal force can cause the self-locking component to automatically unlock, further compromising security. Utility Model Content

[0004] The purpose of this utility model is to provide a lockable roller shutter tail piece, which has the advantages of simple structure, reasonable design, convenient operation and high safety.

[0005] The technical solution adopted by this utility model is as follows: a lockable roller shutter tail control component, including a tail control shaft, a sliding shaft, and a deflector wheel. The sliding shaft is slidably disposed on the tail control shaft, and the deflector wheel is rotatably connected to the tail control shaft. The deflector wheel is drively connected to the sliding shaft, and the deflector wheel can drive the sliding shaft to slide by rotating. At least two locking parts are formed on the deflector wheel, and the at least two locking parts are arranged around the rotation axis of the deflector wheel on the outer side of the circumferential surface of the tail control shaft, and a positioning space is formed between adjacent locking parts. It also includes a locking member, which is slidably disposed on the tail control shaft. The sliding direction of the locking member is arranged along the radial direction of the tail control shaft. The locking member is inserted into and clamped in the positioning space by sliding, so that the tail control shaft and the deflector wheel are positioned relative to each other in the circumferential direction.

[0006] The working principle of this utility model is as follows:

[0007] The locking mechanism switches states by sliding radially along the tail shaft, making operation relatively simple. The small area of ​​the locking mechanism exposed on the tail shaft reduces the risk of being dragged by the curtains, thus improving safety. In addition, since the positioning space is located outside the tail shaft, the locking direction of the locking mechanism is from the inside to the outside of the tail shaft. This design ensures that the locking direction of the locking mechanism is in the same direction as the centrifugal force, thereby ensuring that the locking mechanism remains locked during use, further enhancing safety.

[0008] Furthermore, in the aforementioned lockable roller blind tail piece, the locking part is an arc-shaped structure with the rotation axis of the actuating wheel as the center, and both end faces of the locking part are arc surfaces.

[0009] Furthermore, in the aforementioned lockable roller shutter tail piece, a locking slide is formed on the tail shaft, the locking slide is arranged radially along the tail shaft, and a positioning notch is formed on the locking slide; the locking member is slidably disposed in the locking slide, and an elastic positioning head is formed on the locking member. The locking member slides so that the elastic positioning head is aligned with the positioning notch, and the elastic positioning head locks into the positioning notch under its own elasticity, so that the locking member and the tail shaft are positioned relative to each other.

[0010] Furthermore, as described above, a lockable roller shutter tail piece includes a sliding part, a positioning part, and two extension parts. The positioning part and the two extension parts are connected to the side of the sliding part near the tail shaft axis. The positioning part is located between the two extension parts. A positioning arc surface is formed on the positioning part, which is an arc surface with the tail shaft axis as the center. The two extension parts extend away from the positioning part and the sliding part. The ends of the two extension parts are the elastic positioning heads. The two elastic positioning heads are tangent to the concentric circles of the positioning arc surface.

[0011] Furthermore, in the aforementioned lockable roller shutter tail piece, the tail piece shaft is sequentially formed with an insert shaft portion and a positioning disc portion along its axial direction. The positioning disc portion has a locking slide and a sliding notch. The locking slide is arranged radially along the positioning disc portion, and one end of the locking slide is connected to the outer peripheral surface of the positioning disc portion. The sliding notch is arranged on the outer peripheral edge of the positioning disc portion, and the end face of the positioning disc portion near the insert shaft portion is connected to the locking slide through the sliding notch. The locking piece includes a sliding portion and an operating protrusion. The operating protrusion is arranged on one side of the sliding portion. The sliding portion is slidably arranged in the locking slide, and the operating protrusion is slidably arranged in the sliding notch. An operating gap is formed between the operating protrusion and the inner wall of the sliding notch on the side near the center of the positioning disc portion.

[0012] Further, in the aforementioned lockable roller shutter tail piece, a sliding groove is formed at one end of the tail shaft; a turntable portion and a rotating shaft portion are sequentially formed along its axis of the actuating wheel, and the locking portion is formed on the side of the turntable portion near the rotating shaft portion; a sliding channel is formed on the actuating wheel that runs through the turntable portion and the rotating shaft portion along its axial direction; the rotating shaft portion is rotatably embedded in the sliding groove of the tail shaft; a pressing sliding surface is formed on the end face of the rotating shaft portion facing away from the turntable portion; the travel path of the pressing sliding surface is arranged around the central axis of the rotating shaft portion, and the travel path of the pressing sliding surface gradually moves away from the turntable portion along the central axis of the rotating shaft portion; the sliding shaft is slidably arranged in the sliding channel, and the sliding shaft and the sliding groove are relatively fixed in the circumferential direction; a pressing protrusion is formed on the sliding shaft; a compression spring is compressed between the sliding shaft and the bottom of the sliding groove; and the pressing protrusion of the sliding shaft abuts against the pressing sliding surface of the actuating wheel under the drive of the compression spring.

[0013] Furthermore, in the aforementioned lockable roller shutter tail piece, the top-pressing sliding surface is provided with a plurality of top-pressing platforms along its travel path. The number of top-pressing platforms is equal to the number of positioning spaces and corresponds one-to-one. When the top-pressing protrusion abuts against one of the top-pressing platforms, the locking member is aligned with the corresponding positioning space.

[0014] Furthermore, in the aforementioned lockable roller shutter tail piece, a plurality of first locking protrusions are evenly distributed around the central axis of the sliding groove inner wall, the length direction of the first locking protrusions is arranged along the axial direction of the sliding groove, and a locking slide is formed between each two adjacent first locking protrusions; a plurality of second locking protrusions are evenly distributed around the central axis of the sliding shaft, the length direction of the second locking protrusions is arranged along the axial direction of the sliding shaft, and the second locking protrusions are slidably disposed in the locking slides one by one.

[0015] Furthermore, in the aforementioned lockable roller blind tail piece, the tail shaft has an insert shaft portion and a positioning disc portion formed sequentially along its axis. The insert shaft portion has a plurality of transmission ribs arranged around its axis. One end of the transmission rib is connected to the positioning disc portion, and a burr notch is formed at the connection between the transmission rib and the positioning disc portion.

[0016] Furthermore, in the aforementioned lockable roller shutter tail piece, the positioning disc portion has a plurality of discharge holes, and the discharge holes are connected to the burr recesses one by one.

[0017] The advantages of this utility model are: simple structure, reasonable design, convenient operation, and high safety. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the embodiment when it is unlocked;

[0019] Figure 2 This is a three-dimensional structural diagram of the embodiment when it is locked;

[0020] Figure 3 This is the main view of the embodiment when it is unlocked;

[0021] Figure 4 for Figure 3 A cross-sectional view of the structure along the AA direction;

[0022] Figure 5 The rear view of the tail shaft in this embodiment;

[0023] Figure 6 A three-dimensional structural diagram of the actuating wheel for an embodiment;

[0024] Figure 7 A three-dimensional structural diagram of the sliding shaft in an embodiment;

[0025] Figure 8 This is a front view of the locking component in an embodiment.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Tail shaft; 11-Embedded shaft part; 111-Transmission rib; 112-Flanged notch; 12-Positioning disc part; 121-Locking slide rail; 1211-First positioning notch; 1212-Second positioning notch; 122-Sliding notch; 123-Discharge hole; 13-Sliding groove; 131-First locking protrusion; 132-Locking slide rail; 2-Sliding shaft; 21-Second locking protrusion; 22-Top pressing protrusion; 3-Actuating wheel; 31-Turntable part; 311-Locking part; 312-Positioning space; 32-Rotating shaft part; 321-Top pressing sliding surface; 3211-Top pressing platform; 33-Sliding channel; 4-Locking component; 41-Sliding part; 42-Positioning part; 421-Positioning arc surface; 43-Extension part; 431-Elastic positioning head; 44-Operating protrusion; 5-Compression spring. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] like Figures 1 to 8 An embodiment of a lockable roller shutter tail control includes a tail control shaft 1, a sliding shaft 2, and a deflector wheel 3. The sliding shaft 2 is slidably mounted on the tail control shaft 1, and the deflector wheel 3 is rotatably connected to the tail control shaft 1. The deflector wheel 3 is drively connected to the sliding shaft 2, and the deflector wheel 3 can drive the sliding shaft 2 to slide by rotating. Four locking parts 311 are formed on the deflector wheel 3, and the four locking parts 311 are arranged around the rotation axis of the deflector wheel 3 on the outer side of the circumferential surface of the tail control shaft 1. A positioning space 312 is formed between adjacent locking parts 311. The device also includes a locking member 4, which is slidably mounted on the tail control shaft 1. The sliding direction of the locking member 4 is arranged along the radial direction of the tail control shaft 1. The locking member 4 is inserted into and clamped in the positioning space 312 by sliding, so that the tail control shaft 1 and the deflector wheel 3 are positioned relative to each other in the circumferential direction.

[0030] The working principle of this embodiment is as follows:

[0031] The locking element 4 achieves state switching by sliding along the radial direction of the tail shaft 1, which is relatively simple to operate. The area of ​​the locking element 4 exposed on the tail shaft 1 is small, reducing the risk of being dragged by the curtain and improving safety. In addition, since the positioning space 312 is located outside the tail shaft 1, the locking direction of the locking element 4 is from the inside to the outside of the tail shaft 1. Through this design, the locking direction of the locking element 4 is in the same direction as the centrifugal force, thereby ensuring that the locking element 4 remains locked during use and improving safety.

[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 6As shown, the locking part 311 is an arc-shaped structure with the rotation axis of the actuating wheel 3 as the center, and both ends of the locking part 311 are arc surfaces. The design of both ends of the locking part 311 being arc surfaces makes it easier for the locking member 4 to be inserted into the positioning space 312, and the locking operation is more convenient.

[0033] like Figure 5 As shown, a locking slide 121 is formed on the tail shaft 1. The locking slide 121 is arranged radially along the tail shaft 1. A first positioning recess 1211 and a second positioning recess 1212 are formed on the inner walls of opposite sides of the locking slide 121, respectively. The first positioning recess 1211 and the second positioning recess 1212 are arranged separately along the length of the locking slide 121. The locking member 4 is slidably disposed in the locking slide 121. Two elastic positioning heads 431 are formed on the locking member 4. One elastic positioning head 431 corresponds to one first positioning recess 1211 and one second positioning recess 1212. The locking member 4 is slidably disposed in the locking slide 121. The movement causes the elastic positioning head 431 to move between the first positioning recess 1211 and the second positioning recess 1212. When the elastic positioning head 431 is directly aligned with the first positioning recess 1211 or the second positioning recess 1212, the elastic positioning head 431 locks into the corresponding first positioning recess 1211 or second positioning recess 1212 under its own elastic action, so that the locking member 4 and the tail shaft 1 are positioned relative to each other. When the locking member 4 is in the locked state, the elastic positioning head 431 is locked in the first positioning recess 1211. When the locking member 4 is in the unlocked state, the elastic positioning head 431 is locked in the second positioning recess 1212.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, the locking component 4 includes a sliding part 41, a positioning part 42, and two extension parts 43. The positioning part 42 and the two extension parts 43 are connected to the side of the sliding part 41 near the axis of the tail shaft 1. The positioning part 42 is located between the two extension parts 43. A positioning arc surface 421 is formed on the positioning part 42, which is an arc surface with the axis of the tail shaft 1 as its center. The two extension parts 43 extend away from the positioning part 42 and the sliding part 41. The ends of the two extension parts 43 are the elastic positioning heads 431, which are tangent to the concentric circles of the positioning arc surface 421. With this design, the end of the locking slide 121 near the axis of the tail shaft 1 is made into an arc surface with the axis of the tail shaft 1 as its center. This makes the connection structure between the tail shaft 1 and the locking component 4 more compact. The tail shaft 1 does not need to increase its size to provide sufficient sliding distance for the locking component 4, making production and processing more convenient.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the tail shaft 1 has an insert shaft portion 11 and a positioning disk portion 12 formed sequentially along its axial direction. The positioning disk portion 12 has a sliding notch 122 and a locking slide 121. The locking slide 121 is arranged radially along the positioning disk portion 12. One end of the locking slide 121 is connected to the outer peripheral surface of the positioning disk portion 12. The locking slide 121 is connected to the side of the positioning disk portion 12 facing away from the insert shaft portion 11. The sliding notch 122 is arranged on the outer peripheral edge of the positioning disk portion 12. The end face of the positioning disk portion 12 near the insert shaft portion 11 is connected to the locking slide 121 through the sliding notch 122. The locking member 4 also includes an operating protrusion 44. The operating protrusion 44 is arranged on one side of the sliding portion 41. The sliding portion 41 is slidably arranged in the locking slide 121. The operating protrusion 44 is slidably arranged in the sliding notch 122. An operating gap is formed between the operating protrusion 44 and the inner wall of the sliding notch 122 near the center of the positioning disk portion 12. The operating clearance provides contact space for the user to push the operating protrusion 44, making the operation of the locking element 4 more convenient.

[0036] like Figure 4 , Figure 6 and Figure 7 As shown, a sliding groove 13 is formed at the center of the positioning disc portion 12 of the tail shaft 1 on the side facing away from the mounting shaft portion 11; the actuating wheel 3 has a turntable portion 31 and a rotating shaft portion 32 sequentially formed along its axis. The locking portion 311 is formed on the side of the turntable portion 31 near the rotating shaft portion 32. A sliding channel 33 is formed on the actuating wheel 3, which runs through the turntable portion 31 and the rotating shaft portion 32 along its axial direction. The rotating shaft portion 32 is rotatably embedded in the sliding groove 13 of the tail shaft 1. A pressing sliding surface 3 is formed on the end face of the rotating shaft portion 32 facing away from the turntable portion 31. 21. The travel path of the top-pressing sliding surface 321 is arranged around the central axis of the rotating shaft 32, and the travel path of the top-pressing sliding surface 321 gradually moves away from the turntable 31 along the central axis of the rotating shaft 32. The sliding shaft 2 is slidably arranged in the sliding channel 33, and the sliding shaft 2 and the sliding groove 13 are relatively fixed in the circumferential direction. A top-pressing protrusion 22 is formed on the sliding shaft 2, and a compression spring 5 is compressed between the sliding shaft 2 and the bottom of the sliding groove 13. Under the drive of the compression spring 5, the top-pressing protrusion 22 of the sliding shaft 2 abuts against the top-pressing sliding surface 321 of the actuating wheel 3. With this design, the actuating wheel 3 can easily drive the sliding shaft 2 to slide by rotation, making it more convenient to use.

[0037] like Figure 6As shown, the top-pressing sliding surface 321 has four top-pressing platforms 3211 along its travel path. Each of the four top-pressing platforms 3211 corresponds to one of the four positioning spaces 312. When the top-pressing protrusion 22 abuts against one of the top-pressing platforms 3211, the locking member 4 is aligned with the corresponding positioning space 312. By setting multiple top-pressing platforms 3211, the sliding shaft 2 can have multiple working states with different extension and retraction amounts. The actuating wheel 3 rotates to switch the sliding shaft 2 state step by step to suit different usage scenarios. The one-to-one correspondence between the multiple top-pressing platforms 3211 and the multiple positioning spaces 312 allows the locking member 4 to lock the working state of the sliding shaft 2 according to usage requirements, making it more convenient to use.

[0038] like Figure 4 , Figure 5 and Figure 7 As shown, a plurality of first locking protrusions 131 are evenly distributed around the central axis of the inner wall of the sliding groove 13. The length direction of the first locking protrusions 131 is arranged along the axial direction of the sliding groove 13, and a locking slide 132 is formed between each two adjacent first locking protrusions 131. A plurality of second locking protrusions 21 are evenly distributed around the central axis of the sliding shaft 2. The length direction of the second locking protrusions 21 is arranged along the axial direction of the sliding shaft 2, and the second locking protrusions 21 are slidably disposed in the locking slide 132 in a one-to-one correspondence. This design makes the sliding of the sliding shaft 2 relative to the tail shaft 1 more stable. In this embodiment, one of the second locking protrusions 21 on the sliding shaft 2 is made into an integral structure with the top pressing protrusion 22 to facilitate manufacturing.

[0039] like Figure 1 , Figure 2 and Figure 4 As shown, the mounting shaft portion 11 has several transmission ribs 111 arranged around its axis. One end of each transmission rib 111 is connected to the positioning disk portion 12, and a burr recess 112 is formed at the connection between the transmission rib 111 and the positioning disk portion 12. The transmission ribs 111 are used to cooperate with the positioning structure of the roller blind to achieve coaxial fixation between the tail piece and the roller blind. When the tail piece and the roller blind are assembled, the burrs on the surface of the transmission ribs 111 are squeezed and accumulate towards the positioning disk portion 12. The burr recess 112 provides storage space for the burrs, thus preventing the burrs from being caught on the contact surface between the positioning disk portion 12 and the roller blind. This reduces the processing accuracy requirements of the tail piece while ensuring good coaxiality between the tail piece and the roller blind.

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the positioning disc 12 has a plurality of discharge holes 123, which are connected to the burr recesses 112 one by one. The discharge holes 123 are used to provide discharge channels for the burrs in the burr recesses 112, so as to avoid excessive burrs accumulating in the burr recesses 112 and causing the burrs to be clamped on the contact surface between the positioning disc 12 and the roller shutter, thus ensuring good coaxiality between the tail piece and the roller shutter.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, this utility model can have various modifications, combinations, and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A lockable roller shutter tail stop, comprising a tail stop shaft, a sliding shaft, and a deflector wheel, wherein the sliding shaft is slidably mounted on the tail stop shaft, the deflector wheel is rotatably connected to the tail stop shaft, the deflector wheel is drively connected to the sliding shaft, and the deflector wheel can drive the sliding shaft to slide by rotating; characterized in that: The actuating wheel has at least two locking parts, which are arranged around the rotation axis of the actuating wheel on the outer side of the circumferential surface of the tail shaft, and a positioning space is formed between adjacent locking parts; it also includes a locking member, which is slidably disposed on the tail shaft, and the sliding direction of the locking member is arranged along the radial direction of the tail shaft. The locking member is inserted into and clamped in the positioning space by sliding, so that the tail shaft and the actuating wheel are positioned relative to each other in the circumferential direction.

2. A lockable roller shade tailpiece as defined in claim 1, wherein: The locking part is an arc-shaped structure with the rotation axis of the actuating wheel as the center, and both ends of the locking part are arc surfaces.

3. A lockable roller shade tail piece as defined in claim 1, wherein: A locking slide is formed on the tail shaft, which is arranged radially along the tail shaft. A positioning notch is formed on the locking slide. The locking member is slidably arranged in the locking slide. An elastic positioning head is formed on the locking member. The locking member slides so that the elastic positioning head is aligned with the positioning notch. The elastic positioning head locks into the positioning notch under its own elasticity, so that the locking member and the tail shaft are positioned relative to each other.

4. The lockable roller blind tail piece as described in claim 3, characterized in that: The locking component includes a sliding part, a positioning part, and two extension parts. The positioning part and the two extension parts are connected to the side of the sliding part near the center of the tail shaft. The positioning part is located between the two extension parts. A positioning arc surface is formed on the positioning part. The positioning arc surface is an arc surface with the center of the tail shaft as the center. The two extension parts extend away from the positioning part and the sliding part. The ends of the two extension parts are the elastic positioning heads. The two elastic positioning heads are tangent to the concentric circles of the positioning arc surface.

5. A lockable roller blind tail piece as described in claim 1, characterized in that: The tail shaft has an insert shaft portion and a positioning disk portion formed sequentially along its axial direction. The positioning disk portion has a locking slide and a sliding notch. The locking slide is arranged radially along the positioning disk portion, and one end of the locking slide is connected to the outer peripheral surface of the positioning disk portion. The sliding notch is arranged on the outer peripheral edge of the positioning disk portion, and the end face of the positioning disk portion near the insert shaft portion is connected to the locking slide through the sliding notch. The locking member includes a sliding portion and an operating protrusion. The operating protrusion is arranged on one side of the sliding portion. The sliding portion is slidably arranged in the locking slide, and the operating protrusion is slidably arranged in the sliding notch. An operating gap is formed between the inner wall of the operating protrusion and the sliding notch on the side near the center of the positioning disk portion.

6. The lockable roller blind tail piece as described in claim 1, characterized in that: The tail shaft has a sliding groove at one end; the actuating wheel has a turntable and a shaft portion formed sequentially along its axis, and the locking portion is formed on the side of the turntable near the shaft portion. The actuating wheel has a sliding channel that runs through the turntable and shaft portions along its axis. The shaft portion is rotatably embedded in the sliding groove of the tail shaft. A pressing sliding surface is formed on the end face of the shaft portion facing away from the turntable portion. The travel path of the pressing sliding surface is arranged around the central axis of the shaft portion, and the travel path of the pressing sliding surface gradually moves away from the turntable portion along the central axis of the shaft portion. The sliding shaft is slidably arranged in the sliding channel. The sliding shaft and the sliding groove are relatively fixed in the circumferential direction. A pressing protrusion is formed on the sliding shaft. A compression spring is compressed between the sliding shaft and the bottom of the sliding groove. Under the drive of the compression spring, the pressing protrusion of the sliding shaft abuts against the pressing sliding surface of the actuating wheel.

7. A lockable roller blind tail piece as described in claim 6, characterized in that: The top-pressing sliding surface is provided with several top-pressing platforms along its travel path. The number of top-pressing platforms is equal to the number of positioning spaces and corresponds one-to-one. When the top-pressing protrusion abuts against one of the top-pressing platforms, the locking member is aligned with the corresponding positioning space.

8. A lockable roller blind tail piece as described in claim 6, characterized in that: The inner wall of the sliding groove is evenly provided with a plurality of first locking protrusions around its central axis. The length direction of the first locking protrusions is arranged along the axial direction of the sliding groove, and a locking slide is formed between each two adjacent first locking protrusions. The sliding shaft is evenly provided with a plurality of second locking protrusions around its central axis. The length direction of the second locking protrusions is arranged along the axial direction of the sliding shaft, and the second locking protrusions are slidably disposed in the locking slides one by one.

9. A lockable roller blind tail piece as described in claim 1, characterized in that: The tail shaft has an insert shaft portion and a positioning disk portion formed sequentially along its axis. The insert shaft portion has a number of transmission ribs arranged around its axis. One end of the transmission rib is connected to the positioning disk portion, and a burr notch is formed at the connection between the transmission rib and the positioning disk portion.

10. A lockable roller blind tail piece as described in claim 9, characterized in that: The positioning disc has several discharge holes, and the discharge holes are connected to the burr recesses one by one.

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