Head for curtain pull rope

Abstract

The utility model discloses a manufacturing head for a curtain pull rope, which comprises a shell and a core shaft used for being connected and matched with a winding shaft of external curtain cloth, a winding cavity is formed in the shell in a hollow mode, a winding disc is rotatably arranged in the winding cavity, and the winding disc and the core shaft are coaxially connected. The shell is provided with an open groove, and one end of an external curtain pull rope can be placed into the winding cavity, wound around the winding disc and then penetrate out of the shell through the open groove. A plurality of clamping grooves which are used for being matched with a plurality of pull beads on an external curtain pull rope in a one-to-one clamping mode so as to drive the winding disc to rotate when the pull rope is pulled and acting force is applied to the clamping grooves through the pull beads are annularly formed in the winding disc, and the radial section of each clamping groove is in an arc shape; a limiting structure used for limiting displacement or shaking of pull beads of an external pull rope in the corresponding clamping grooves is arranged on the winding disc. The curtain pull rope head solves the problem that the pull bead is difficult to drive the furling shaft to rotate when the pull rope is pulled due to the fact that the matching strength between the traditional curtain pull rope head and the pull bead of the pull rope is low.

Description

Technical Field

[0001] This utility model relates to the field of curtain cord making technology, specifically a curtain cord making head. Background Technology

[0002] Curtains are commonly used in homes and buildings for sun shading and decoration. Their pull-cord retraction mechanism is widely used because it is easy to operate and inexpensive. Traditional curtain pull cord heads typically consist of a housing, a spindle connected to the curtain roll-up shaft, and a roll-up reel for winding the pull cord. The pull beads, spaced apart on the pull cord, need to engage with slots on the roll-up reel. Pulling the pull cord causes the pull beads to rotate the roll-up reel, thus raising and lowering the curtain. However, existing technologies have significant flaws in the engagement structure between the roll-up reel's slots and the pull beads: Firstly, the radial cross-section of the slots is often linear or a simple rectangular structure, resulting in a small contact area with spherical or ellipsoidal pull beads. This makes them prone to slippage or wobbling, hindering the stable transmission of pulling force from the pull beads to the roll-up reel. Secondly, traditional heads lack effective limiting structures, allowing the pull beads to easily shift radially or wobble circumferentially within the slots. Especially with frequent pulling or uneven force, the engagement strength between the pull beads and the slots is insufficient, leading to slippage, jamming, or even detachment from the slots. This prevents the roll-up shaft from rotating properly with the pull cord, severely impacting the user experience and lifespan of the curtains. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a curtain pull cord control head, which solves the problem that the low fit strength between the traditional curtain pull cord control head and the pull bead of the pull cord makes it difficult for the pull bead to drive the winding shaft to rotate when the pull cord is pulled.

[0004] To achieve the above objectives, this utility model provides a curtain pull cord control head, including a housing and a core shaft for connecting and cooperating with the winding shaft of an external curtain fabric. The housing has a hollow winding cavity, in which a winding reel is rotatably disposed and coaxially connected with the core shaft. The housing has a slot for inserting one end of the external curtain pull cord into the winding cavity, winding around the winding reel, and exiting the housing. The slot has a partition for dividing the slot into an inlet and an outlet. The winding reel has a plurality of slots arranged circumferentially for engaging with a plurality of pull beads on the external curtain pull cord to drive the winding reel to rotate when the pull cord is pulled and the pull beads exert force on the slots. The radial cross-section of the slots is arc-shaped. The winding reel has a limiting structure for restricting the movement or wobbling of the pull beads of the external pull cord in the corresponding slots.

[0005] The advantages of adopting the above technical solution are as follows: By setting the radial cross-section of the card slot to an arc shape, the contact area between the card slot and the pull bead is significantly increased. The arc-shaped surface can better fit the spherical contour of the pull bead, effectively reducing the sliding gap when the two are engaged and improving the force transmission efficiency during engagement. The setting of the limiting structure can restrict the radial displacement and circumferential sway of the pull bead in the card slot, ensuring that the force of the pull bead can be stably transmitted to the winding reel when the pull cord is pulled, avoiding slippage or jamming caused by loose fit. Compared with the traditional straight card slot, the combination of the arc-shaped card slot and the limiting structure fundamentally optimizes the transmission mechanism between the pull bead and the winding reel from a structural design perspective, significantly enhancing the transmission reliability of the control head, improving the smoothness and stability of the curtain opening and closing operation, and extending the service life of the control head.

[0006] The present invention further comprises: the limiting structure including a plurality of limiting plates evenly distributed circumferentially on the outer peripheral wall of the winding reel, the plurality of limiting plates being arranged one-to-one with a plurality of slots, the plurality of limiting plates being located on one side of their respective slots, the limiting plates being arranged perpendicularly to the slots, and the inner peripheral wall of the limiting plates being provided with a limiting groove for abutting against the pull ball when the external pull rope is subjected to force and drives the pull ball to move in the slot, the radial cross section of the limiting groove being arc-shaped.

[0007] The advantages of adopting the above technical solution are as follows: The limiting structure in the above technology uses a limiting plate that corresponds one-to-one with the slot, and the inner peripheral wall of the limiting plate is provided with an arc-shaped limiting groove, which can form a radial limit on the pull ball from the side. When the pull rope is under force, the displacement of the pull ball in the slot is constrained by the limiting groove. The arc-shaped contour of the limiting groove fits the spherical surface of the pull ball, which can not only evenly distribute the pulling force through the contact surface, but also limit the circumferential sway of the pull ball, so that the movement trajectory of the pull ball in the slot is precisely controlled. The structural design of the limiting plate and the slot being perpendicular can effectively prevent the pull ball from coming out of the side of the slot. Especially when the pull rope is frequently pulled or the force is uneven, it can significantly reduce the collision and wear between the pull ball and the edge of the slot, improve the tightness and durability of the fit between the two, and ensure that the head maintains stable transmission performance during long-term use.

[0008] The present invention further comprises: adjacent limiting plates are staggered, and several limiting plates are arranged in pairs at both ends of the outer peripheral wall of the winding reel.

[0009] The advantages of adopting the above technical solution are: the adjacent limiting plates are staggered and set at both ends of the outer peripheral wall of the winding reel. This layout makes the pull ball symmetrically constrained by the limiting plates at both ends in the slot, avoiding the problem of uneven force that may be caused by unilateral limiting. The staggered limiting plates can form alternating limiting when the pull ball moves circumferentially, adapting to the changes in tension in different directions of the pull rope, ensuring that the force is balanced when the winding reel rotates. The structural design of grouping at both ends can also effectively disperse the radial pressure of the pull ball on the winding reel, reduce the structural deformation caused by local stress concentration, and improve the overall mechanical stability of the head.

[0010] This utility model further comprises: an adjustment cavity is provided in the housing, an adjustment plate and a pre-tightening pulley are movably arranged in the adjustment cavity, the adjustment cavity is connected to the winding cavity and forms a movable hole for the pre-tightening pulley to partially pass through the winding cavity to achieve sliding friction between the pre-tightening pulley and the external pull ball, movable shafts are provided on both sides of the pre-tightening pulley, and a rotating shaft is rotatably connected between the end of the movable shaft and the pre-tightening pulley, the beginning ends of the two movable shafts are configured to cooperate with the adjustment plate, the top wall of the adjustment plate is rotatably connected to the adjustment shaft, the adjustment cavity is connected to the top wall of the housing and forms an adjustment hole, and the adjustment shaft is threadedly connected to the adjustment hole.

[0011] The advantages of adopting the above technical solution are: the pre-tightening pulley installed in the adjustment cavity is connected to the winding cavity through the movable hole, which can generate sliding friction pre-tightening force on the pull bead. The threaded engagement between the adjustment shaft and the adjustment hole allows the user to push the adjustment plate up and down by rotating the adjustment shaft, thereby changing the degree of pressure of the pre-tightening pulley on the pull bead, thus realizing stepless adjustment of the pre-tightening force of the pull bead on the curtain pull cord, avoiding the problem of the pull bead and the slot failing to cooperate due to the loosening of the pull cord, that is, by applying pre-tightening force to the pull bead, it is ensured that the pull bead can cooperate with the slot.

[0012] The present invention further comprises: micro-movement holes are provided on the bottom wall of the adjusting plate corresponding to the positions of the two movable shafts; the starting ends of the two movable shafts are movably disposed in their respective micro-movement holes; micro-movement springs are connected between the bottom wall of the adjusting plate and the two movable shafts; the starting end of the micro-movement spring is connected to the bottom wall of the adjusting plate; the ending end of the micro-movement spring is connected to the outer peripheral wall of the movable shaft; and the micro-movement spring is sleeved on the movable shaft.

[0013] The advantages of adopting the above technical solution are as follows: the cooperation between the micro-motion spring and the movable shaft in the above technology enables the pre-tensioning pulley to have an elastic floating function. When the tension of the pull rope changes, the micro-motion spring can automatically adjust the clamping force applied by the pre-tensioning pulley to the pull ball by compression or extension, so as to achieve dynamic pre-tensioning. The elastic connection structure can effectively buffer the instantaneous impact force when the pull rope is pulled, reduce the rigid collision between the pre-tensioning pulley and the pull ball, reduce transmission noise and component wear, and the guiding effect of the micro-motion hole on the movable shaft ensures the uniform application of the pre-tensioning force and avoids the problem of pull rope jamming caused by the tilt of the pre-tensioning pulley. Compared with the rigid connection pre-tensioning structure, the elastic micro-motion design allows the control head to better adapt to the slight changes in the tension of the pull rope, maintain a stable pre-tensioning state, extend the service life of the pre-tensioning mechanism, and improve the reliability and durability of the control head.

[0014] The present invention is further provided in that: a through hole is provided on the housing for the mandrel to pass through, and a bearing is connected between the through hole and the mandrel.

[0015] The advantages of adopting the above technical solution are: the bearing set between the housing perforation and the mandrel in the above technology converts the sliding friction between the mandrel and the housing into rolling friction, which significantly reduces the mechanical resistance when the winding reel rotates. The high-precision rotational fit of the bearing can ensure the coaxiality of the mandrel and the winding reel, avoid the misalignment of the slot and the ball bearing caused by eccentric rotation, and improve the transmission accuracy. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of the present invention;

[0017] Figure 2 for Figure 1 3D view after removing the shell;

[0018] Figure 3 This is a simplified cross-sectional view of the adjusting plate and its linkage structure in this utility model;

[0019] Figure 4 This is a simplified schematic diagram of the adjustment plate and its linkage structure in coordination with the winding reel in this utility model. Detailed Implementation

[0020] This utility model provides a head for a curtain pull cord, including a housing 1 and a core shaft 11 for connecting and cooperating with the winding shaft of an external curtain fabric. The housing 1 has a hollow winding cavity 12, in which a winding reel 2 is rotatably disposed and coaxially connected with the core shaft 11. The housing 1 has a slot for inserting one end of the external curtain pull cord into the winding cavity 12, winding around the winding reel 2, and then exiting the housing 1. The slot has a partition 13 for dividing the slot into an inlet 132 and an outlet 131. The winding reel 2 has a plurality of beads arranged circumferentially for engaging with a plurality of pull beads on the external curtain pull cord, so that when the pull cord is pulled and the pull beads exert force on the slot 21, the winding reel 2 rotates. The winding reel 2 has a movable slot 21, the slot 21 having an arc-shaped radial cross-section. The winding reel 2 is provided with a limiting structure to restrict the movement or wobbling of the pull bead of the external pull rope within the corresponding slot 21. The limiting structure includes several limiting plates 22 evenly distributed circumferentially on the outer peripheral wall of the winding reel 2. Each limiting plate 22 corresponds to one of the slots 21, and each limiting plate 22 is positioned on one side of its corresponding slot 21. The limiting plate 22 is perpendicular to the slot 21, and its inner peripheral wall has a limiting groove 221 for contacting the pull bead when the external pull rope is subjected to force and moves within the slot 21. The limiting groove 221 has an arc-shaped radial cross-section. Adjacent limiting plates 221... Position plates 22 are staggered, and several limiting plates 22 are arranged in pairs at both ends of the outer peripheral wall of the take-up reel 2. An adjustment cavity 14 is provided in the housing 1. An adjustment plate 3 and a pre-tensioning pulley 31 are movably arranged in the adjustment cavity 14. The adjustment cavity 14 is connected to the take-up cavity 12 and forms a movable hole 141 for the pre-tensioning pulley 31 to partially protrude from the take-up cavity 12 to achieve sliding friction between the pre-tensioning pulley 31 and the external pull beads. Movable shafts 32 are provided on both sides of the pre-tensioning pulley 31. A rotating shaft 33 is rotatably connected to the end of the movable shaft 32 and the pre-tensioning pulley 31. The beginnings of the two movable shafts 32 are engaged with the adjustment plate 3. An adjustment shaft 34 is rotatably connected to the top wall of the adjustment plate 3. The adjustment cavity 1... 4. The adjustment shaft 34 is connected to the top wall of the housing 1 and has an adjustment hole 142. The adjustment shaft 34 is threadedly connected to the adjustment hole 142. The bottom wall of the adjustment plate 3 is provided with micro-movement holes 35 corresponding to the positions of the two movable shafts 32. The beginning ends of the two movable shafts 32 are movably disposed in their respective micro-movement holes 35. The bottom wall of the adjustment plate 3 is connected to the two movable shafts 32. The beginning end of the micro-movement spring 36 is connected to the bottom wall of the adjustment plate 3. The end end of the micro-movement spring 36 is connected to the outer peripheral wall of the movable shaft 32. The micro-movement spring 36 is sleeved on the movable shaft 32. The housing 1 has a through hole 15 for the mandrel 11 to pass through. A bearing 151 is connected between the through hole 15 and the mandrel 11.

[0021] The pull bead of the external curtain pull cord described in the above technology is attached to the instruction manual. Figure 4 The identifier in it is 4.

[0022] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A head for a curtain pull cord, characterized in that: The device includes a housing and a spindle for connecting and engaging with a winding shaft of an external curtain. The housing has a hollow winding cavity, in which a winding reel is rotatably mounted and coaxially connected with the spindle. The housing has a slot for inserting one end of the external curtain pull cord into the winding cavity, winding around the winding reel, and exiting the housing. The slot has a partition for dividing it into an inlet and an outlet. The winding reel has several circumferentially arranged slots for engaging with several pull beads on the external curtain pull cord to rotate the winding reel when the pull cord is pulled and the pull beads exert force on the slots. The slots have an arc-shaped radial cross-section. The winding reel has a limiting structure for restricting the movement or wobbling of the pull beads of the external curtain pull cord in the corresponding slots.

2. A cord grip according to claim 1, wherein: The limiting structure includes several limiting plates evenly distributed circumferentially on the outer peripheral wall of the winding reel. Each of the limiting plates corresponds to a certain number of slots. Each of the limiting plates is located on one side of its corresponding slot. The limiting plates are perpendicular to the slots, and the inner peripheral wall of the limiting plates is provided with a limiting groove for abutting against the pull ball when the external pull rope is subjected to force and causes the pull ball to move in the slot. The radial cross-section of the limiting groove is arc-shaped.

3. A cord grip according to claim 2, wherein: The adjacent limiting plates are staggered, and the limiting plates are arranged in pairs at both ends of the outer peripheral wall of the winding reel.

4. A cord grip according to claim 1, wherein: The housing has an adjustment cavity, in which an adjustment plate and a pre-tightening pulley are movably arranged. The adjustment cavity is connected to the winding cavity and forms a movable hole for the pre-tightening pulley to partially pass through the winding cavity to achieve sliding friction between the pre-tightening pulley and the external pull beads. Movable shafts are provided on both sides of the pre-tightening pulley. The ends of the movable shafts are rotatably connected to the pre-tightening pulleys. The beginnings of the two movable shafts are engaged with the adjustment plate. The top wall of the adjustment plate is rotatably connected to the adjustment shaft. The adjustment cavity is connected to the top wall of the housing and forms an adjustment hole. The adjustment shaft is threadedly connected to the adjustment hole.

5. A cord grip according to claim 4, wherein: The bottom wall of the adjusting plate is provided with micro-motion holes corresponding to the two movable shaft positions. The starting ends of the two movable shafts are movably disposed in their respective micro-motion holes. A micro-motion spring is connected between the bottom wall of the adjusting plate and the two movable shafts. The starting end of the micro-motion spring is connected to the bottom wall of the adjusting plate, and the ending end of the micro-motion spring is connected to the outer peripheral wall of the movable shaft. The micro-motion spring is sleeved on the movable shaft.

6. A cord grip according to claim 1, wherein: The housing has a through hole for the mandrel to pass through, and a bearing is connected between the through hole and the mandrel.

Images