CN105715195B - Curtain body positioning mechanism for cordless curtains - Google Patents

Abstract

A curtain body positioning mechanism for a cord-free curtain mainly utilizes two clutch units to control the positioning effect of the curtain body during the unfolding and folding process. The clutch unit has a wheel shaft, two brake blocks, a clutch wheel and two planetary gears. The two brake blocks are connected to the periphery of the wheel shaft at intervals so that a rolling groove is formed between the two brake blocks. The clutch wheel is sleeved on the wheel shaft and has an inner ring tooth portion surrounding the two brake blocks. The planetary gear is arranged in the rolling groove and meshes with the inner ring tooth portion of the clutch wheel, so that the planetary gear can be driven by the inner ring tooth portion of the clutch wheel to engage or separate with the brake blocks. Therefore, when the planetary gear is engaged with the brake block, the curtain body will not be driven to complete the positioning.

Description

Curtain body positioning mechanism for cordless curtains

technical field

The invention relates to a cordless curtain, in particular to a curtain body positioning mechanism for a cordless curtain.

Background technique

General curtains can be divided into cord-drawn and cordless in structure. Among them, cord-drawn curtains mainly use a cord to drive the curtain body to expand or close, while cordless curtains use a cord to The hand exerts pull-down or push-up force on the lower beam, so that the curtain body can achieve the effect of unfolding or retracting.

However, although the cordless curtains allow users to easily adjust the opening or closing of the curtain body, the lack of a good positioning design in the structural configuration often leads to the situation that the curtain body tends to automatically rise after it is fully unfolded. Or there will be a problem of automatic drooping after it is fully folded, which will cause troubles for users in actual operation.

Contents of the invention

The object of the present invention is to provide a curtain body positioning mechanism for a curtain without a drawstring, which has a simple structure and good positioning effect, so as to increase the convenience of operation.

In order to achieve the above object, the curtain body positioning mechanism provided by the present invention includes: a base; two coiled spring wheels, which are rotatably arranged on the base and engaged with each other; a coil spring, connected to the two coiled spring wheels and can be selectively wound on one of the spring wheels; two pulleys are rotatably arranged on the base and respectively engaged with one of the spring wheels; two clutch units are respectively adjacent to one of the pulleys and Respectively have a wheel shaft, at least two brake blocks, a clutch wheel, and at least two planetary gears, the wheel shaft is fixed on the base, the two brake blocks are fixed on the base at intervals and connected to the periphery of the wheel shaft, A rolling groove is formed between the two brake blocks. The clutch wheel has a shaft hole and an inner ring tooth adjacent to the shaft hole. The shaft hole is rotatably sleeved on the wheel shaft. The inner ring tooth Parts surround the two brake blocks, each of the planetary gears is rotatably arranged in one of the rolling grooves and meshes with the inner ring teeth of the clutch wheel, so that each of the planetary gears can be driven by the inner ring of the clutch wheel Driven by the tooth portion, the brake blocks are locked or separated from each other; and two stay ropes respectively surround a clutch wheel and are respectively fixed to a stay rope pulley with one end thereof.

Preferably, each of the rolling grooves is arc-shaped.

Preferably, the curvature of one end of each of the rolling grooves is greater than the curvature of the other end of each of the rolling grooves, so that the two ends of each of the brake blocks respectively form a braking portion and a receiving portion, and the curvature of the braking portion greater than the curvature of the receiving portion, when each of the planetary gears engages with the braking portion of the brake block, the clutch wheel cannot rotate; when each of the planetary gears abuts against the receiving portion of the brake block, the clutch wheel Can rotate freely.

Preferably, the number of brake blocks of each clutch unit is two, and the two brake blocks are arranged opposite to each other centered on the wheel shaft.

Preferably, the number of brake blocks of each clutch unit is three, and the three brake blocks are arranged at equal angles around the axle, so that a rolling groove is formed between two adjacent brake blocks.

Thus, when the planetary gear is engaged with the inner ring gear of the clutch wheel, the clutch wheel will not be able to rotate, and the curtain body will not be able to be deployed or retracted to complete the positioning. When the inner ring tooth portion of the clutch wheel, the clutch wheel can rotate freely, and now the curtain body can be launched.

Description of drawings

Fig. 1 is a perspective view of a curtain in accordance with the first embodiment of the present invention.

Fig. 2 is an exploded perspective view of the first embodiment of the present invention.

Fig. 3 is a top sectional view of the clutch unit according to the first embodiment of the present invention.

FIG. 4 is a top view of the clutch unit of the present invention, mainly showing that the planetary gear is engaged with the brake part of the brake block.

FIG. 5 is similar to FIG. 4 , mainly showing the receiving portion where the planetary gear abuts against the brake block.

Fig. 6 is a front view of the present invention with a curtain, mainly showing the unfolded state of the curtain body.

Fig. 7 is similar to Fig. 6 and mainly shows the folded state of the curtain body.

FIG. 8 is a top sectional view of a clutch unit according to a second embodiment of the present invention.

Explanation of symbols in the drawings

10 curtain without drawstring, 12 positioning mechanism of curtain body, 14 upper beam, 16 lower beam, 18 curtain body, 20 base, 22 top plate, 24 bottom plate, 30 coil spring wheel, 40 coil spring, 50 rope pulley, 60 clutch Unit, 61 axles, 62 brake blocks, 63 clutch wheels, 64 planetary gears, 65 rolling grooves, 66 brake parts, 67 receiving parts, 68 shaft holes, 69 inner ring gear parts, 70 stay ropes.

detailed description

Please refer to Fig. 1 and Fig. 7 first, the curtain body positioning mechanism 12 of the present invention is mainly used with a cordless curtain 10, and the cordless curtain 10 shown in the figure includes an upper beam 14, a lower beam 16, and a set The curtain body 18 between the upper and lower beams 14,16. Please refer to Fig. 2 and Fig. 3 again, the curtain body positioning mechanism 12 of the present invention comprises a base 20, two coil spring wheels 30, a coil spring 40, two pulley pulleys 50, two clutch units 60, and two stay cords 70 .

The base 20 is installed in the upper beam 14 and has a top plate 22 and a bottom plate 24 .

The coil spring wheels 30 are rotatably disposed on the base 20 and engaged with each other.

Both ends of the coil spring 40 are respectively connected to the coil spring wheels 30 , so that the two coil spring wheels 30 can be rotated synchronously by the coil spring 40 .

The rope pulleys 50 are rotatably arranged on the base 20 and respectively engaged with one coil spring wheel 30 , so that the rope pulley 50 can rotate synchronously with the spring coil 30 engaged with it.

The clutch unit 60 is adjacent to the cable pulley 50 and has a wheel shaft 61 , three brake blocks 62 , a clutch wheel 63 , and three planetary gears 64 . The wheel shaft 61 is fixed on the bottom plate 24 of the base 20; the three brake blocks 62 are fixed on the bottom plate 24 of the base 20 and connected to the outer periphery of the wheel shaft 61 in an equiangular arrangement, so that two adjacent brake blocks 62 An arc-shaped rolling groove 65 is formed between them, and as shown in Figure 4 and Figure 5, the curvature of one end of the arc-shaped rolling groove 65 is greater than the curvature of the other end of the arc-shaped rolling groove 65, because the two sides of each arc-shaped rolling groove 65 The ends are adjacent to different brake blocks 62, so the two ends of each brake block 62 will form a brake part 66 and a receiving part 67 respectively according to the curvature difference between the two ends of the arc-shaped rolling groove 65. The curvature of the moving part 66 is greater than the curvature of the receiving part 67; the clutch wheel 63 has a shaft hole 68 and an inner ring tooth part 69 adjacent to the shaft hole 68, the clutch wheel 63 is sleeved on the wheel shaft 61 by the shaft hole 68, and the clutch wheel 63 will allow the inner ring gear 69 to surround the brake block 62 after being sleeved on the wheel shaft 61; the planetary gear 64 is arranged in the rolling groove 65 and meshed with the inner ring gear 69 of the clutch wheel 63, so that the planetary gear 64 can be driven by the inner ring tooth portion 69 of the clutch wheel 63 to roll along the rolling groove 65 during the rotation of the clutch wheel 63 .

The stay rope 70 circles around the clutch wheel 63 and is respectively fixed to the lower beam 16 and the pull rope pulley 50 with its two ends, so that the pull rope 70 can be driven by the pull of the lower beam 16 to drive the clutch pulley 63 and the pull rope pulley 50 to rotate together. .

When the curtain body 18 is to be unfolded, as shown in Figure 6 , first apply force to pull the lower beam 14 downward, so that the stay cord 70 is stretched by the lower beam 14, and the stay cord 70 will first drive The clutch wheel 63 and the rope pulley 50 start to rotate. During the rotation of the clutch wheel 63, as shown in FIG. The receiving part 67 of 62, at this time, the planetary gear 64 will be in an idling state, so that the clutch wheel 63 can be pulled by the pull cord 70 to rotate freely. The connected coil spring wheels 30 rotate, so that the coil spring 40 is retracted from one of the coil spring wheels 30 to the other coil spring wheel 30 to accumulate its own elastic recovery force.

Once the curtain body 18 is unfolded to a proper position, the tension applied to the lower beam 14 is released. At this time, the coil spring wheel 30 will be affected by the elastic recovery force of the coil spring 40 to drive the cable pulley 50 to produce a slight reverse rotation. , then a small part of the stay rope 70 will be wound during the reverse rotation of the stay rope wheel 50, so that the clutch wheel 63 can be pulled by the stay rope 70 to produce a slight reverse rotation. During the process, the planetary gear 64 will be driven by the inner ring tooth portion 69 to roll along the rolling groove 65 until it is engaged with the brake portion 66 of the brake block 62, as shown in FIG. 5 , so that the planetary gear 64 will immediately Stop rotation, after the planetary gear 64 stops rotating, the clutch wheel 63 will stop rotating. At this time, the stay rope 70 will present a static force balance between the friction resistance with the clutch wheel 63 and the elastic restoring force of the coil spring 40 state, so that the curtain body 18 can be kept in the unfolded state.

When the curtain body 18 is to be folded, as shown in FIG. 7 , first apply force to push the lower beam 14 upward, so that the stay cord 70 becomes a relaxed state and reduces the frictional resistance with the clutch wheel 63 . The elastic recovery force of the coil spring 40 will force the coil spring wheel 30 to rotate in the opposite direction at the same time by means of the thrust of the user. During the rotation of the coil spring wheel 30, it will drive the rope pulley 50 to rotate again, so that the rope pulley 50 is opposite to the pull rope. 70 is rolled up until the curtain body 18 is completely closed, and then the thrust given to the lower beam 14 is released, so that the stay cord 70 is tightly wound around the clutch wheel 63 again. The frictional resistance between the wheels 63 will again present a state of static force balance, so that the curtain body 18 remains in the retracted state.

What needs to be supplemented here is that the present invention can have different changes in structure. As shown in FIG. The moving block 62 is connected to the outer periphery of the wheel shaft 61 in a manner opposite to each other, so that a rolling groove 65 is respectively formed between the two ends of the two braking blocks 62, and a planetary gear 64 is arranged in each rolling groove 65. Therefore, when the clutch wheel 63 is driven by the pull rope 70 , it can also drive the planetary gear 64 to roll along the rolling groove 65 , so that the clutching effect can also be produced between the planetary gear 64 and the brake block 62 .

To sum up, the curtain body positioning mechanism 12 of the present invention uses the clutch unit 60 to provide a good positioning effect on the curtain body 18. Overall, it has a simple structure and configuration, and the operation stability is also very good, so it can effectively solve the problem of curtain positioning. The body 18 rises back after unfolding and sags when it is folded to achieve the purpose of increasing the convenience of operation.

Claims (5)

1. A curtain body positioning mechanism for a cordless curtain, comprising: a base; Two spring wheels are rotatably arranged on the base and engaged with each other; a coil spring connected to the two coil spring wheels and optionally wound on one of the coil spring wheels; Two rope pulleys are rotatably arranged on the base and engaged with one of the coil spring wheels respectively; Two clutch units are arranged adjacent to one of the rope pulleys and respectively have a wheel shaft, at least two brake blocks, a clutch wheel, and at least two planetary gears, the wheel shaft is fixed on the base, and the two brake blocks are spaced apart from each other fixed on the base and connected to the periphery of the wheel shaft, so that a rolling groove is formed between the two brake blocks, the clutch wheel has a shaft hole and an inner ring tooth adjacent to the shaft hole, the shaft The hole is rotatably sleeved on the wheel shaft, the inner ring gear surrounds the two brake blocks, and each of the planetary gears is rotatably arranged in one of the rolling grooves and engages with the inner ring gear of the clutch wheel , so that each of the planetary gears can be driven by the inner ring gear of the clutch wheel to engage with or separate from a brake block; and Two stay cords respectively surround one of the clutch wheels and are respectively fixed to one of the stay cord wheels with one end thereof. 2. The curtain body positioning mechanism of the cordless curtain according to claim 1, wherein each of the rolling grooves is arc-shaped. 3. The curtain body positioning mechanism of the cordless curtain according to claim 2, wherein the curvature of one end of each of the rolling grooves is greater than the curvature of the other end of each of the rolling grooves, so that the two ends of each of the braking blocks are respectively formed A braking part and a receiving part, the curvature of the braking part is greater than the curvature of the receiving part, when each of the planetary gears is engaged with the braking part of the brake block, the clutch wheel cannot rotate, when each of the planetary gears The gear abuts against the receiving portion of the brake block, and the clutch wheel can rotate freely. 4 . The curtain body positioning mechanism for a drawstring-free curtain according to claim 3 , wherein the number of brake blocks of each clutch unit is two, and the two brake blocks are arranged opposite to each other with the axle as the center. 5. The curtain body positioning mechanism of the cordless curtain according to claim 3, wherein, the number of brake blocks of each clutch unit is three, and the three brake blocks are arranged at equal angles with the axle as the center, so that the corresponding A rolling groove is formed between two adjacent brake blocks.