Automatic control device for pull rope of cordless venetian blind

Abstract

The utility model discloses an automatic control device for a cordless venetian blind pull rope, and relates to the technical field of household articles for daily use. The device is composed of an upper fixing plate, a lower fixing plate, a first coil spring gear, a second coil spring gear, a first pull rope gear and a second pull rope gear, and the first pull rope gear, the second coil spring gear, the first coil spring gear and the second pull rope gear are sequentially meshed and arranged in a space formed by the lower fixing plate and the upper fixing plate. The first coil spring gear is fixed on the upper fixing plate and is rotatably sleeved by the sleeves on the lower fixing plate and the upper fixing plate, a coil spring is wound on the first coil spring gear, the movable end of the coil spring is fixed on the second coil spring gear, and the two pull ropes are respectively wound on the first pull rope gear and the second pull rope gear; swing piece assemblies are arranged on the outer sides of the first pull rope gear and the second pull rope gear between the lower fixing plate and the upper fixing plate respectively, the movable end of the pull rope penetrates through the swing piece assemblies in a winding mode, and in the moving process of the pull rope, the swing piece assemblies apply resistance or smoothness to the rotating first pull rope gear and the rotating second pull rope gear to prevent the first pull rope gear and the second pull rope gear from rotating.

Description

Technical Field

[0001] The utility model relates to the technical field of household products, in particular to a cordless blind pull cord automatic control device for blinds. Background Art

[0002] In modern homes, curtains primarily serve to shield the interior from the outside world and regulate the entry of outdoor light. Venetian blinds, for example, easily achieve this purpose by adjusting the spread and angle of the blades. The blades are controlled by a drawstring and ladder wire to achieve up-and-down movement and rotation relative to the top rail. One end of the drawstring hangs down on one side of the curtain for the user to pull; the other end is fixed to the bottom of the curtain, allowing the curtain to be pulled upward or downward. This type of drawstring curtain is inconvenient to use. The looped drawstrings often become tangled, requiring careful attention to ensure the correct orientation of the drawstrings. Furthermore, the looped drawstrings pose a fatal risk to children: if they are caught around their necks while playing, they can easily pose a life-threatening risk.

[0003] To address this issue, manufacturers have designed cordless Venetian blinds. These blinds use a control mechanism mounted on the upper rail to reel the cord onto the control's take-up wheel, fundamentally eliminating the potential risk of the cord being left hanging. The control's springs automatically counterweight the blinds, controlling their upward and downward movement. However, existing cordless blinds often experience inaccurate braking during the raising and lowering process due to difficulties synchronizing the cord, take-up wheel, and spring. This can lead to the blinds sometimes drooping, significantly impacting their usability. Summary of the Invention

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a cordless Venetian blinds regulating device pull cord automatic control device that can accurately locate.

[0005] The utility model adopts the following technical solutions:

[0006] The automatic control device for pulling the cord of a cordless Venetian blind is composed of an upper fixed plate, a lower fixed plate, a first coil spring gear, a second coil spring gear, a first pull rope gear and a second pull rope gear. The first pull rope gear, the second coil spring gear, the first coil spring gear and the second pull rope gear are meshed in sequence and arranged in a space formed by the lower fixed plate and the upper fixed plate, and are rotatably sleeved by sleeves on the lower fixed plate and the upper fixed plate. A coil spring is wound around the first coil spring gear, the movable end of the coil spring is fixed to the second coil spring gear, and two pull ropes are respectively wound around the first pull rope gear and the second pull rope gear; a pendulum assembly is respectively provided on the outer side of the first pull rope gear and the second pull rope gear between the lower fixed plate and the upper fixed plate, the movable end of the pull rope passes through the pendulum assembly, and during the movement of the pull rope, the pendulum assembly applies resistance or smoothness to the rotating first pull rope gear and the second pull rope gear to prevent their rotation;

[0007] The pendulum assembly is composed of a pendulum, a pendulum shaft, a side winding shaft, a linear shaft and a transverse shaft. The pendulum is rotatably arranged on the outside of the first and second rope pull gears between the lower and upper fixed plates via the pendulum shaft. A side winding shaft is fixed to the pendulum on one side of the pendulum shaft. A linear shaft is fixed between the lower and upper fixed plates, away from the outside of the first and second rope pull gears.

[0008] The movable end of the pull rope is wound around the swing shaft away from the outside of the first pull rope gear and the second pull rope gear, the side winding shaft is close to the inside of the first pull rope gear and the second pull rope gear, and the linear shaft is close to the inside of the first pull rope gear and the second pull rope gear, and is led out from between the lower fixed plate and the upper fixed plate;

[0009] The edge of the upper portion of the swing member near the first and second rope pull gears is in an arc shape and is in the same direction as the arc of the edge near the first and second rope pull gears. The arc of the edge of the swing member is greater than the curvature radius of the arc of the edge near the first and second rope pull gears.

[0010] The outward pulling rope drawn out from between the lower fixing plate and the upper fixing plate is drawn out from above the horizontal axis fixed to the port of the lower fixing plate;

[0011] The coil spring is in a disk shape, with a fixed end fixed on the first coil spring gear and a movable end fixed on the second coil spring gear.

[0012] Since the utility model provides pendulum components on the outside of the first rope pull gear and the second rope pull gear respectively, the pendulum is driven to swing during the movement of the rope, and the edge of the pendulum squeezes or separates from the edge of the first rope pull gear and the second rope pull gear. When the curtain is pulled down, the weight of the curtain plus the downward pulling force causes the pendulum to fit well with the first rope pull gear and the second rope pull gear, generating friction, thereby avoiding the risk of the curtain automatically sliding down when the curtain is too heavy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attachment Figure 1 It is a three-dimensional diagram of the utility model;

[0014] Attachment Figure 2 This is a three-dimensional diagram of the utility model with the upper fixing plate separated;

[0015] Attachment Figure 3 This is a three-dimensional exploded view of the utility model;

[0016] Attachment Figure 4 For attachment Figure 2 Partial enlarged view;

[0017] Attachment Figure 5 A schematic diagram of the pull rope winding around the pendulum assembly;

[0018] Attachment Figure 6 This is a three-dimensional diagram of another embodiment of the present invention. DETAILED DESCRIPTION

[0019] See attached Figures 1 to 5 , a cordless Venetian blinds pull cord automatic control device, composed of an upper fixed plate 1, a lower fixed plate 2, a first coil spring gear 3, a second coil spring gear 4, a first pull rope gear 5 and a second pull rope gear 6, the first pull rope gear 5, the second coil spring gear 4, the first coil spring gear 3 and the second pull rope gear 6 are meshed in sequence and arranged in a space formed by the lower fixed plate 2 and the upper fixed plate 1, and are rotatably sleeved by the sleeves on the lower fixed plate 2 and the upper fixed plate 1. The first coil spring gear 3 is wound with a coil spring 9, the movable end of the coil spring 9 is fixed on the second coil spring gear 4, and two pull ropes 8 are respectively wound on the first pull rope gear 5 and the second pull rope gear 6; a pendulum assembly 7 is respectively provided on the outer side of the first pull rope gear 5 and the second pull rope gear 6 between the lower fixed plate 2 and the upper fixed plate 1, the movable end of the pull rope 8 passes through the pendulum assembly 7, and during the movement of the pull rope 8, the pendulum assembly 7 applies resistance or smoothness to the rotating first pull rope gear 5 and the second pull rope gear 6 to prevent them from rotating;

[0020] The swing member assembly 7 is composed of a swing member 71, a swing shaft 72, a side winding shaft 73, a linear shaft 74 and a transverse shaft 75. The swing member 71 is rotatably arranged on the outside of the first and second rope-pulling gears 5 and 6 between the lower fixed plate 2 and the upper fixed plate 1 via the swing shaft 72. The side winding shaft 73 is fixed to the swing member 71 on one side of the swing shaft 72. A linear shaft 74 is fixed between the lower fixed plate 2 and the upper fixed plate 1, away from the outside of the first and second rope-pulling gears 5 and 6.

[0021] The movable end of the pull rope 8 is passed around the swing shaft 72 away from the outside of the first pull rope gear 5 and the second pull rope gear 6, the side winding shaft 73 is close to the inside of the first pull rope gear 5 and the second pull rope gear 6, and the linear shaft 743 is close to the inside of the first pull rope gear 5 and the second pull rope gear 6, and is led out from between the lower fixed plate 2 and the upper fixed plate 1;

[0022] The edge of the upper portion of the swing member 71 near the first rope pull gear 5 and the second rope pull gear 6 is in an arc shape and is in the same direction as the arc of the edge near the first rope pull gear 5 and the second rope pull gear 6. The arc of the edge of the swing member 71 is greater than the curvature radius of the arc of the edge near the first rope pull gear 5 and the second rope pull gear 6.

[0023] The outward pulling rope 8 drawn out from between the lower fixing plate 2 and the upper fixing plate 1 is drawn out from above the horizontal axis 75 fixed to the end of the lower fixing plate 2;

[0024] The coil spring 9 is in a disc shape, with a fixed end fixed on the first coil spring gear 3 and a movable end fixed on the second coil spring gear 4.

[0025] When the curtain is to be pulled down, the user pulls down the curtain, and the curtain drives the drawstring 8 to be pulled out from the first drawstring gear 5 and the second drawstring gear 6 in the direction away from the first drawstring gear 5 and the second drawstring gear 6. Since the movable end of the drawstring 8 passes around the swing shaft 72 away from the outside of the first drawstring gear 5 and the second drawstring gear 6, the side winding shaft 73 is close to the inside of the first drawstring gear 5 and the second drawstring gear 6, and the linear shaft 743 is close to the inside of the first drawstring gear 5 and the second drawstring gear 6, it is led out from between the lower fixed plate 2 and the upper fixed plate 1. This is equivalent to giving a deflecting torsion to the pendulum 71 that is rotatable through the swing shaft 72 and is arranged between the lower fixed plate 2 and the upper fixed plate 1. The pendulum 71 swings around the swing shaft The shaft 72 generates a clockwise deflection; because the pull rope 8 drives the first pull rope gear 5 and the second pull rope gear 6 wound thereon to rotate counterclockwise when being led out, and the arc of the edge of the pendulum 71 adjacent to the first pull rope gear 5 and the second pull rope gear 6 is in the same direction, the edge arc of the pendulum 71 is larger than the curvature radius of the edge arc of the adjacent first pull rope gear 5 and the second pull rope gear 6. The edge of one side of the pendulum 71 contacts the edge arc of one side of the first pull rope gear 5 and the second pull rope gear 6, generating friction. If the speed of the pull rope 8 is faster, the contact between the two is closer. In this way, when the curtain body automatically slides down or the tension is too large, the pendulum assembly 7 can automatically adjust the speed of the curtain body's descent;

[0026] Similarly, when the user lifts the curtain, the coil spring 9 wound from the first coil spring gear 3 to the second coil spring gear 4 generates a rebound force (this is a known technology and will not be repeated here), causing the second coil spring gear 4 to rotate, and the first pull rope gear 5 meshing with it rotates in the opposite direction, driving the pull rope 8 to retract, so that the edge of one side of the pendulum 71 and the arc contact with the edge of one side of the first pull rope gear 5 and the second pull rope gear 6 are reduced, maintaining a dynamic balance between the rebound force and the friction force, and also making the curtain body very light and labor-saving during the raising operation.

[0027] See attached Figure 6 When a double-layer rope-pulling gear 05 is used to replace the first rope-pulling gear 5 and the second rope-pulling gear 6, the rope 8 wound on the lower groove 051 of the rope-pulling gear 05, which is the same as the rope 8 in the embodiment of this case, is similarly led out from between the lower fixed plate 2 and the upper fixed plate 1 through the pendulum assembly 7; the rope 8 wound on the upper groove 052 of the rope-pulling gear 05 is guided to the pendulum assembly 7 at the other end through the guide rod 076, and is led out from between the lower fixed plate 2 and the upper fixed plate 1 at the other end. These improvements and changes should all fall within the scope of protection claimed by the present utility model.

Claims

1. An automatic control device for a cordless Venetian blind cord, comprising an upper fixed plate, a lower fixed plate, a first coil spring gear, a second coil spring gear, a first cord pull gear, and a second cord pull gear. The first cord pull gear, the second coil spring gear, the first coil spring gear, and the second cord pull gear are sequentially meshed and arranged within a space defined by the lower and upper fixed plates, and are rotatably coupled to sleeves on the lower and upper fixed plates. A coil spring is wound around the first coil spring gear, the movable end of which is fixed to the second coil spring gear. Two cords are respectively wound around the first cord pull gear and the second cord pull gear. The device is characterized in that: A pendulum assembly is respectively provided on the outside of the first rope pull gear and the second rope pull gear between the lower fixed plate and the upper fixed plate. The movable end of the rope passes through the pendulum assembly, and during the movement of the rope, the pendulum assembly applies resistance or smoothness to the rotating first rope pull gear and the second rope pull gear to prevent their rotation.

2. The cordless Venetian blinds pull cord automatic control device according to claim 1, characterized in that: The pendulum assembly is composed of a pendulum, a pendulum shaft, a side winding shaft, a linear shaft and a horizontal shaft. The pendulum is rotatably arranged on the outside of the first rope pull gear and the second rope pull gear between the lower fixed plate and the upper fixed plate through the pendulum shaft. A side winding shaft is fixed on the pendulum on one side of the pendulum shaft, and a linear shaft is fixed between the lower fixed plate and the upper fixed plate away from the outside of the first rope pull gear and the second rope pull gear.

3. The cordless Venetian blinds pull cord automatic control device according to claim 1, characterized in that: The movable end of the pull rope passes around the swing shaft away from the outside of the first pull rope gear and the second pull rope gear, the side winding shaft is close to the inside of the first pull rope gear and the second pull rope gear, and the linear shaft is close to the inside of the first pull rope gear and the second pull rope gear, and is led out from between the lower fixed plate and the upper fixed plate.

4. The cordless Venetian blinds pull cord automatic control device according to claim 1, characterized in that: The edge of the upper part of the swing member close to the first rope pull gear and the second rope pull gear is in an arc shape and is in the same direction as the arc of the edge close to the first rope pull gear and the second rope pull gear. The arc of the edge of the swing member is larger than the curvature radius of the arc of the edge close to the first rope pull gear (5) and the second rope pull gear.

5. The cordless Venetian blinds pull cord automatic control device according to claim 3, characterized in that: The outward pulling rope (8) drawn out from between the lower fixing plate and the upper fixing plate is drawn out from above the horizontal axis fixed to the port of the lower fixing plate.

6. The cordless Venetian blinds pull cord automatic control device according to claim 1, characterized in that: The coil spring is in a disk shape, with a fixed end fixed on the first coil spring gear and a movable end fixed on the second coil spring gear.

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