Improved roller blind limiter

Abstract

This utility model discloses an improved roller blind limiter, including a lead rod, a first limiting device, a second limiting device, a nut, a rotating inner sleeve, and an adjusting device. The first and second limiting devices are each located at one end of the lead rod. The first limiting device has a first movable hole along the axial direction, and one end of the lead rod is telescopically connected to the movable hole. The adjusting device includes an adjusting disc and a screw. The screw is located within the first movable hole, and the adjusting disc is fixedly connected to the outer end of the screw. The lead rod has a second movable hole along the axial direction, with an internal thread. The inner end of the screw is inserted into the second movable hole and threadedly connected to the internal thread. Rotation of the adjusting disc drives the screw to rotate, causing the lead rod to retract into or extend out of the first movable hole. The nut is rotatably positioned between the first and second limiting devices on the exposed external thread of the lead rod. This utility model adjusts the length of the exposed external thread of the lead rod through the adjusting device, thereby adjusting the range of rotational movement of the nut within the lead rod.

Description

Technical Field

[0001] This utility model relates to the technical field of roller blind limiters, specifically to an improved roller blind limiter. Background Technology

[0002] Patent CN219197208U discloses an improved structure for a roller blind limiter, which includes a lead rod, a first limiting device, a second limiting device, a nut, a rotating inner sleeve, and an adjusting device. The first and second limiting devices are each disposed at one end of the lead rod. The nut is placed between the first and second limiting devices and rotatably disposed on the lead rod. The adjusting device is connected and fixed to one end of the lead rod. The rotating inner sleeve is rotatably disposed on the adjusting device. The adjusting device includes a first rotating component, a second rotating component, and a movable block. One end of the first rotating component and one end of the lead rod are axially connected and fixed. The rotating inner sleeve rotates around the outer circumference of the first rotating component. The first rotating component has a groove in the radial direction. The second rotating component is rotatably connected to the first rotating component. The second rotating component has a handle in the radial direction. The movable block is movably disposed on the handle. The movable block moves toward the second rotating component. When the movable block is engaged in the groove, the handle drives the first rotating component, the second rotating component, and the lead rod to rotate synchronously.

[0003] Its shortcomings include the fact that the overall length of the roller blind limiter is not adjustable, specifically, the rotation range of the nut on the screw is not adjustable, which makes it impossible for the roller blind limiter to adjust the rolling range of the curtain. Utility Model Content

[0004] The purpose of this invention is to provide an improved roller blind limiter that facilitates the adjustment of the nut's movement range.

[0005] The purpose of this utility model is achieved as follows.

[0006] An improved roller blind limiter includes a lead screw, a first limiting device, a second limiting device, a nut, a rotating inner sleeve, and an adjusting device. The first and second limiting devices are each located at one end of the lead screw. The rotating inner sleeve rotates on the first limiting device. The first limiting device has a first movable hole along its axial direction. One end of the lead screw is telescopically connected to the movable hole. The adjusting device includes an adjusting disc and a screw. The screw is located within the first movable hole. The adjusting disc and the outer end of the screw are connected and fixed. The lead screw has a second movable hole along its axial direction, with an internal thread. The inner end of the screw is inserted into the second movable hole and threadedly connected to the internal thread. Rotating the adjusting disc drives the screw to rotate, causing the lead screw to retract into or extend out of the first movable hole. The nut is rotatably positioned between the first and second limiting devices on the exposed external thread of the lead screw.

[0007] Furthermore, the first limiting device is equipped with a locking device, the movable end of which restricts the rotation of the adjusting disc. The locking device restricts the rotation of the adjusting disc, thus limiting its independent rotation.

[0008] Furthermore, the first limiting device includes a limiting rod, a fixed plate, and a fixed cover. The fixed plate is fixed to the outer end of the limiting rod, and the fixed cover and the fixed plate are detachably connected. A mounting cavity for accommodating the adjusting turntable is formed between the fixed cover and the fixed plate. The limiting rod has a first movable hole that communicates with the mounting cavity. A rotating inner sleeve is fitted onto the outer circumference of the limiting rod. The first limiting device has a simple structure and facilitates the installation of the adjusting device.

[0009] Furthermore, both the fixed cover and the fixed plate have notches to expose the adjusting dial. Users can directly operate the adjusting dial manually.

[0010] Furthermore, the locking device includes a guide arm and a locking block disposed at a notch on the fixed cover or fixed plate. The locking block is movably disposed along the length of the guide arm. The outer circumference of the adjusting turntable is evenly provided with teeth. When the locking block is inserted into the gap between adjacent teeth, the locking block and the adjusting turntable are locked. When the locking block disengages from the gap between adjacent teeth, an external force drives the adjusting turntable to rotate. The locking device has a simple and reasonable structure and operates stably and reliably.

[0011] Furthermore, the guide arm is arranged radially along the adjusting turntable, and the side of the guide arm near the teeth has a dovetail-shaped protrusion. The locking block has a dovetail groove, and the dovetail-shaped protrusion is inserted into the dovetail groove. The dovetail-shaped protrusion has a groove along its length. The groove reduces the friction between the locking block and the guide arm, making the movement of the locking block easier.

[0012] Furthermore, the lock block has lock grooves on both sides, and protrusions on both sides of the teeth facing the gap. An elastic latch is located on one side of the top of each protrusion. Under external force, the lock block overcomes the resistance of the elastic latch, causing the protrusions to insert into or disengage from the lock grooves. The protrusions prevent the lock block from inserting into or disengaging from the gap on its own.

[0013] Furthermore, the fixed disc extends a convex shaft into the mounting cavity, and the adjusting disc has a shaft hole into which the convex shaft is inserted, allowing the adjusting disc to rotate around the convex shaft. This ensures stable rotation of the adjusting disc and prevents damage to the internal threads.

[0014] Furthermore, at least one guide bar is provided along the length direction inside the first movable hole, and at least one guide groove is provided along the length direction on the outer periphery of the corresponding lead screw. The lead screw is inserted into the first movable hole, and the guide bar is inserted into the guide groove and slides along the length direction. The guide groove and guide bar cooperate to restrict the rotation of the lead screw and guide the lead screw to perform telescopic movement relative to the first movable hole.

[0015] Furthermore, the second movable hole has a protrusion near the first limiting device, and the protrusion has the internal thread. The inner end of the screw has a limiting part, which abuts against the inner side of the protrusion to limit the movement range of the screw within the second movable hole. This prevents the screw and lead screw from disengaging due to excessive rotation of the adjusting turntable.

[0016] This invention uses an adjusting device to extend and retract the lead screw relative to the first limiting device, thereby adjusting the length of the exposed external thread of the lead screw and thus realizing the range of rotational movement of the adjusting nut within the lead screw. Operation is simple and easy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 (lock block insertion gap state).

[0018] Figure 2 This is a schematic diagram of the structure of Embodiment 1 (lock block disengaged from the gap).

[0019] Figure 3 This is a schematic diagram of the exploded structure of Example 1.

[0020] Figure 4 This is another exploded structural diagram of Example 1.

[0021] Figure 5 This is a cross-sectional structural diagram of Example 1. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Example 1, see Figure 1-5 As shown, an improved roller blind limiter includes a screw rod 1, a first limiting device 2, a second limiting device 3, a nut 4, a rotating inner sleeve 5, an adjusting device 6, and a locking device 7.

[0024] The first limiting device 2 is located at one end of the lead screw 1. The first limiting device 2 includes a limiting rod 21, a fixing plate 22, and a fixing cover 23. The fixing plate 22 is fixed to the outer end of the limiting rod 21, and the fixing cover 23 and the fixing plate 22 are connected by screws. A mounting cavity 24 is formed between the fixing cover 23 and the fixing plate 22. A first movable hole 25 is provided axially inside the limiting rod 21, communicating with the mounting cavity 24. Two guide strips 26 are provided along the length direction inside the first movable hole 25. The rotating inner sleeve 5 rotates around the outer circumference of the limiting rod 21. Both the fixing cover 23 and the fixing plate 22 have notches 27 to expose the adjusting turntable 61. Preferably, the fixing plate 22 and the limiting rod 21 are integrally formed.

[0025] The adjusting device 6 includes an adjusting disc 61 and a screw 62. The screw 62 is disposed within the first movable hole 25, and the outer ends of the adjusting disc 61 and the screw 62 are connected and fixed. A fixed disc 22 extends a protruding shaft portion 28 into the mounting cavity 24. The adjusting disc 61 has a shaft hole 63, and the protruding shaft portion 28 is inserted into the shaft hole 63, allowing the adjusting disc 61 to rotate around the protruding shaft portion 28. That is, the adjusting disc 61 is rotatably disposed within the mounting cavity 24, and the screw 62 extends into the first movable hole 25. The outer circumference of the adjusting disc 61 is uniformly provided with teeth 64. Preferably, the adjusting disc 61 and the screw 62 are integrally formed.

[0026] A locking device 7 is located at the notch 27, and the movable end of the locking device 7 restricts the rotation of the adjusting turntable 61. Specifically, the locking device 7 includes a guide arm 71 and a locking block 72 located at the notch 27 on the fixed cover 23. The guide arm 71 is arranged radially along the adjusting turntable 61, and the locking block 72 is movably arranged along the length of the guide arm 71. When the locking block 72 is inserted into the gap 65 between adjacent teeth 64, the locking block 72 and the adjusting turntable 61 are locked. When the locking block 72 disengages from the gap 65 between adjacent teeth 64, an external force drives the adjusting turntable 61 to rotate. Preferably, the locking block 72 has locking grooves 73 on both sides, and the teeth 64 have protrusions 66 on both sides. The teeth 64 have an elastic buckle 67 on one side of the top of the protrusion 66. Under the action of external force, the locking block 72 overcomes the resistance of the elastic buckle 67, causing the protrusion 66 to insert into or disengage from the locking groove 73. The guide arm 71 has a dovetail-shaped protrusion 74 on the side near the tooth 64, and the locking block 72 has a dovetail groove 76. The dovetail-shaped protrusion 74 is inserted into the dovetail groove 76, and the dovetail-shaped protrusion 74 has a groove 75 along its length.

[0027] The lead screw 1 has a second movable hole 11 along its axial direction. A protrusion 12 is located near the end of the second movable hole 11 closest to the first limiting device 2, and an internal thread 13 is provided on the protrusion 12. The inner end of the screw 62 is inserted into the second movable hole 11 and threadedly connected to the internal thread 13. A limiting part 68 is located at the inner end of the screw 62, and the limiting part 68 abuts against the inner side of the protrusion 12, restricting the movement range of the screw 62 within the second movable hole 11. Generally, after the screw 62 and the lead screw 1 are connected, the limiting part 68 is installed after the screw 62 extends beyond the other end of the lead screw 1, and the limiting part 68 can retract into the second movable hole 11.

[0028] Two guide grooves 14 are provided on the outer periphery of the lead screw 1 along the length direction. The lead screw 1 is inserted into the first movable hole 25, and the guide bar 26 is inserted into the corresponding guide groove 14 and slides along the length direction.

[0029] Nut 4 is rotatably mounted on the external thread 15 of the lead screw 1. The second limiting device 3 is fixed to the other end of the lead screw 1 by a screw. Nut 4 is rotatably mounted between the first limiting device 2 and the second limiting device 3 on the exposed external thread 15 of the lead screw 1.

[0030] Working process: The rotation of the adjusting turntable 61 drives the screw 62 to rotate synchronously. The screw 62 and the lead screw 1 are threadedly connected by their internal threads 13. However, the lead screw 1 and the limiting rod 21 are connected by the guide bar 26 and the guide groove 14, which restricts the rotation of the lead screw 1. When the screw 62 rotates, the lead screw 1 retracts into or extends out of the first movable hole 25, thus adjusting the exposed length of the external thread 15 of the lead screw 1. The end of the limiting rod 21 and the second limiting device 3 together limit the movement range of the nut. After the adjustment is completed, the locking block 72 overcomes the resistance of the elastic buckle 67 and enters the gap 65 between the adjacent teeth 64. The locking block 72 and the adjusting turntable 61 are limited, preventing the adjusting turntable 61 from continuing to rotate, thereby fixing the exposed length of the external thread 15 of the lead screw 1.

[0031] The terms used in this utility model, such as "first," "second," etc., do not indicate any order, quantity, or importance, but are only used for distinction.

[0032] In this invention, terms such as "a" or "an" are used to indicate not a limitation on the quantity, but rather to indicate the existence of at least one of the mentioned objects.

[0033] In this utility model, terms indicating direction or location such as front end, rear end, top, bottom, side, longitudinal, transverse, middle, center, outside, inside, horizontal, vertical, left, right, above, below, etc., are used to indicate relative positions rather than absolute positions.

[0034] Terms used in this invention, such as "approximately," "overall," "approximately," and "similar," are limiting terms used to indicate features that exist but allow for certain deviations. The amount of deviation allowed may vary depending on the specific context.

Claims

1. An improved roller blind limiter, comprising a thread rod (1), a first limiting device (2), a second limiting device (3), a nut (4), a rotating inner sleeve (5), and an adjusting device (6), wherein the first limiting device (2) and the second limiting device (3) are each disposed at one end of the thread rod (1), and the rotating inner sleeve (5) is fitted onto the first limiting device (2) and rotates thereon. The feature is that... The first limiting device (2) has a first movable hole (25) along the axial direction. One end of the screw (1) is telescopically connected to the movable hole. The adjusting device (6) includes an adjusting turntable (61) and a screw (62). The screw (62) is located in the first movable hole (25). The adjusting turntable (61) and the outer end of the screw (62) are connected and fixed. The screw (1) has a second movable hole (11) along the axial direction. The second movable hole (11) has an internal thread (13). The inner end of the screw (62) is inserted into the second movable hole (11) and threadedly connected to the internal thread (13). The adjusting turntable (61) rotates and drives the screw (62) to rotate. The screw (62) causes the screw (1) to retract into or extend out of the first movable hole (25). The nut (4) is rotatably set between the first limiting device (2) and the second limiting device (3) on the exposed external thread (15) of the screw (1).

2. The improved roller blind limiter according to claim 1, characterized in that, The first limiting device (2) is equipped with a locking device (7), and the movable end of the locking device (7) restricts the rotation of the adjusting turntable (61).

3. The improved roller blind limiter according to claim 2, characterized in that, The first limiting device (2) includes a limiting rod (21), a fixed plate (22) and a fixed cover (23). The fixed plate (22) is fixed to the outer end of the limiting rod (21). The fixed cover (23) and the fixed plate (22) are detachably connected. An installation cavity (24) for accommodating the adjusting turntable (61) is formed between the fixed cover (23) and the fixed plate (22). The first movable hole (25) is provided in the limiting rod (21). The first movable hole (25) and the installation cavity (24) are connected. The rotating inner sleeve (5) is fitted on the outer periphery of the limiting rod (21).

4. The improved roller blind limiter according to claim 3, characterized in that, Both the fixed cover (23) and the fixed plate (22) have notches (27) to expose the adjusting turntable (61).

5. The improved roller blind limiter according to claim 4, characterized in that, The locking device (7) includes a guide arm (71) and a locking block (72) provided at the notch (27) on the fixed cover (23) or the fixed plate (22). The locking block (72) is movably arranged along the length direction of the guide arm (71). The outer circumference of the adjusting turntable (61) is evenly provided with teeth (64). When the locking block (72) is inserted into the gap (65) of the adjacent teeth (64), the locking block (72) and the adjusting turntable (61) are locked. When the locking block (72) is disengaged from the gap (65) of the adjacent teeth (64), the external force drives the adjusting turntable (61) to rotate.

6. The improved roller blind limiter according to claim 5, characterized in that, The guide arm (71) is arranged in the radial direction of the adjusting turntable (61). The guide arm (71) has a dovetail-shaped protrusion (74) on the side near the tooth (64). The locking block (72) is provided with a dovetail groove (76). The dovetail-shaped protrusion (74) is inserted into the dovetail groove (76). The dovetail-shaped protrusion (74) is provided with a groove (75) along its length.

7. The improved roller blind limiter according to claim 5, characterized in that, Locking blocks (72) are provided with locking grooves (73) on both sides, and protrusions (66) are provided on both sides of the teeth (64). The teeth (64) are provided with an elastic buckle (67) on one side of the top of the protrusion (66). Under the action of external force, the locking blocks (72) overcome the resistance of the elastic buckle (67) so that the protrusion (66) can be inserted into or disengaged from the locking groove (73).

8. The improved roller blind limiter according to claim 3, characterized in that, The fixed plate (22) extends into the mounting cavity (24) with a protruding shaft (28). The adjusting turntable (61) is provided with a shaft hole (63). The protruding shaft (28) is inserted into the shaft hole (63). The adjusting turntable (61) rotates around the protruding shaft (28).

9. The improved roller blind limiter according to claim 3, characterized in that, At least one guide bar (26) is provided in the first movable hole (25) along the length direction, and at least one guide groove (14) is provided in the outer periphery of the corresponding screw (1) along the length direction. The screw (1) is inserted into the first movable hole (25), and the guide bar (26) is inserted into the guide groove (14) and slides along the length direction.

10. The improved roller blind limiter according to claim 3, characterized in that, The second movable hole (11) has a protrusion (12) near the first limiting device (2) and the protrusion (12) has the internal thread (13). The inner end of the screw (62) has a limiting part (68). The limiting part (68) and the inner side of the protrusion (12) abut against each other to limit the movement range of the screw (62) within the second movable hole (11).

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