CN105715194B - Curtain body positioning mechanism for cordless curtains - Google Patents

Abstract

A curtain positioning mechanism for a cordless curtain comprises a fixed seat, two first transmission wheels, two second transmission wheels, two movable shafts, and two resistance wheels, wherein the first transmission wheel is arranged on the fixed seat and connected by a coil spring, the second transmission wheel is arranged on the fixed seat and meshed with the first transmission wheel, the second transmission wheel is connected with a transmission rope, the two movable shafts are arranged on the fixed seat in a transversely movable manner and connected by a tension spring, the resistance wheel is rotatably sleeved on the movable shaft and surrounded by the transmission rope, so that the resistance wheel can be clamped on a stopper arranged on the fixed seat by the elastic restoring force of the tension spring, and can be separated from the stopper by the pulling force of the transmission rope. Thus, the curtain body can obtain a good positioning effect during the process of unfolding and folding.

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.

As far as the known technology of cordless curtains is concerned, such as U.S. Patent No. 7,025,107 uses a one-way tensioning mechanism to control the action of the first and second drawstrings. When the curtain is unfolding, the one-way tension The mechanism will be driven to the disengaged position by the first and second pull cords. At this time, the first and second pull cords can move freely. The stay cord is driven to the engaging position, and at this moment, the first and second stay cords cannot be retracted by the brake to complete the positioning of the curtain. However, in this patent, the brake and the one-way tensioning mechanism are separately installed in the top rail. In addition to increasing the complexity of the overall structure, due to the limited space in the top rail, it is bound to cause troublesome assembly.

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 can simplify the structure and have good positioning effect, so as to increase the convenience in operation.

In order to achieve the above object, the curtain body positioning mechanism provided by the present invention includes: a fixed seat, the two ends of the fixed seat respectively have an upper guide groove and a lower guide groove, and the upper and lower guide grooves correspond to each other; A transmission wheel is rotatably arranged on the fixed seat and engaged with each other; a coil spring is connected with the two first transmission wheels and can be selectively wound on one of the two first transmission wheels; Two transmission wheels, which are rotatably arranged on the fixed seat and are respectively engaged with one of the first transmission wheels; two transmission ropes, one end of each transmission rope is connected to one of the second transmission wheels; and one resistance unit has two movable shafts , at least one tension spring, two stoppers, and two resistance wheels, the top and bottom ends of each movable shaft are movably embedded in the upper and lower guide grooves of the fixed seat, and the tension spring connects the two movable Shaft, each of the stoppers is arranged on the fixed seat and located between the second transmission wheel and the movable shaft, each of the resistance wheels is rotatably sleeved on the movable shaft and surrounded by a transmission rope so that each of the resistance wheels can be separated from the stopper by the pulling force of the transmission rope and can be engaged with the stopper by the elastic restoring force of the tension spring.

Preferably, wherein, the top and bottom ends of each movable shaft respectively have a guide block, and the two guide blocks are respectively embedded in the upper and lower guide grooves of the fixed seat, and the length of each guide block is shorter than the upper and lower guide slots. The length of the lower channel.

Preferably, the number of the tension springs is two, and the two tension springs are respectively connected between the guide blocks of the two movable shafts.

Preferably, the stopper is a rod body, each of the resistance wheels has two resistance toothed plates and a movable shaft connecting the two resistance toothed plates, and the two resistance toothed plates are detachably clamped to the stopper, The movable shaft is surrounded by a transmission rope.

Preferably, the two ends of the fixing seat respectively have an upper fixing hole and a lower fixing hole, the upper and lower fixing holes correspond to each other, and the top and bottom ends of the stopper are respectively inserted and fixed on the upper and lower fixing holes. , In the lower fixing hole.

Description of drawings

Fig. 1 is a three-dimensional assembled view of the present invention.

Fig. 2 is a three-dimensional exploded view of the present invention.

Fig. 3 is a partial top view of the present invention, mainly showing the state that the resistance wheel and the stopper are separated from each other.

Fig. 4 is a partial top view of the present invention, mainly showing the state that the resistance wheel and the stopper are engaged with each other.

Fig. 5 is a front view of the present invention when the curtain body is unfolded.

Fig. 6 is a front view of the present invention when the curtain body is folded.

Explanation of symbols in the drawings

10 Curtain without drawstring, 12 Upper beam, 14 Lower beam, 16 Curtain body, 18 Curtain body positioning mechanism, 20 Fixing seat, 21 Upper fixing plate, 22 Upper fixing column, 23 Upper guide groove, 24 Upper fixing hole, 25 Lower Fixed plate, 26 lower fixed columns, 27 lower guide grooves, 28 lower fixed holes, 30 the first transmission wheel, 31 the first transmission tooth plate, 32 the first transmission wheel shaft, 40 coil spring, 50 the second transmission wheel, 51 the second Transmission chainring, 52 second transmission wheel shafts, 60 transmission ropes, 70 resistance units, 71 movable shafts, 72 tension springs, 73 stoppers, 74 resistance wheels, 75 guide blocks, 76 resistance chainrings, 77 resistance wheel shafts.

detailed description

Please refer to Fig. 1 and Fig. 5 first, the cordless curtain 10 shown in the figure comprises an upper beam 12, a lower beam 14 opposite to the upper beam 12, and a curtain located between the upper and lower beams 12, 14. Body 16. Please refer to FIG. 2 again, the curtain body positioning mechanism 18 of the present invention includes a fixed base 20 , two first transmission wheels 30 , a coil spring 40 , two second transmission wheels 50 , two transmission ropes 60 , and a resistance unit 70 .

The fixing seat 20 is installed in the upper beam 12 . The fixing seat 20 has an upper fixing plate 21 and a lower fixing plate 25, and the upper and lower fixing plates 21, 25 are assembled together in a symmetrical manner. The bottom surface of the upper fixing plate 21 has four upper fixing columns 22 arranged at intervals, and the two ends of the upper fixing plate 21 respectively have an upper guide groove 23 and an upper fixing hole 24 adjacent to the upper guide groove 23, wherein the upper guide Groove 23 extends along the length direction of upper fixing plate 21, and the top surface of lower fixing plate 25 has four lower fixing columns 26 arranged at intervals, the top of lower fixing columns 26 and the bottom end of upper fixing columns 22 of upper fixing plate 21 The two ends of the lower fixing plate 25 respectively have a lower guide groove 27 and a lower fixing hole 28 adjacent to the lower guide groove 27, wherein the lower guide groove 27 is along the length of the lower fixing plate 25. The direction extends and corresponds to the upper guide groove 23 of the upper fixing plate 21 , and the lower fixing hole 28 corresponds to the upper fixing hole 24 of the upper fixing plate 21 .

The first transmission wheel 30 has two first transmission toothed plates 31 and a first transmission wheel shaft 32 connected between the two first transmission toothed plates 31, and the first transmission wheel shaft 32 is sleeved on the seat of the fixed seat 20 during assembly. After the two upper and lower fixing columns 22 and 26 are assembled, the first transmission toothed discs 31 of the two first transmission wheels 30 will mesh with each other, so that the two first transmission wheels 30 can rotate synchronously.

The two ends of the coil spring 40 are respectively connected to the first transmission wheel shaft 32 of the first transmission wheel 30, so that the coil spring 40 can be wound around the first transmission of one of the first transmission wheels 30 by the rotation of the two first transmission wheels 30. Axle 32.

The second transmission wheel 50 has two second transmission toothed plates 51 and a second transmission wheel shaft 52 connected between the two second transmission toothed plates 51, and the second transmission wheel shaft 52 is sleeved on the seat 20 during assembly The other two upper and lower fixing columns 22, 26, after the assembly is completed, the second transmission toothed disc 51 of the second transmission wheel 50 will engage with the first transmission toothed disc 31 of the first transmission wheel 30, so that the first and second The two transmission wheels 30, 50 can rotate synchronously.

One end of the transmission rope 60 is fixed to the second transmission wheel shaft 52 of the second transmission wheel 50 , and the other end of the transmission rope 60 passes through the curtain body 16 and is fixed to the lower beam 14 .

The resistance unit 70 has two movable shafts 71 , two tension springs 72 , two stoppers 73 , and two resistance wheels 74 , as shown in FIGS. 2 to 4 . The top and bottom ends of the movable shaft 71 have a guide block 75 respectively, and the movable shaft 71 is embedded in the upper and lower guide grooves 23, 27 of the holder 20 by the guide block 75. Since the length of the guide block 75 is less than that of the upper and lower The length of the guide groove 23,27 makes the movable shaft 71 move along the upper and lower guide grooves 23,27 of the fixed seat 20; the two tension springs 72 are respectively connected between the guide blocks 75 of the two movable shafts 71 for The movable shaft 71 is pulled toward the direction of the second transmission wheel 50; the stopper 73 is taken as an example here by a rod body, and when assembling, the top and bottom ends of the stopper 73 are respectively inserted and fixed on the upper and lower sides of the fixed seat 20. In the lower fixing holes 24, 28, after the assembly is completed, the stopper 73 will be located between the second transmission wheel 50 and the movable shaft 71; the resistance wheel 74 has two resistance toothed discs 76 and one connected to the second resistance toothed discs 76 Between the resistance wheel shaft 77, the resistance wheel 74 is sleeved on the movable shaft 71 by the resistance wheel shaft 77 during assembly and is surrounded by the transmission rope 60, so that the resistance wheel 74 can be driven by the pulling force of the transmission rope 60 on the one hand. The disc 76 is separated from the stopper 73 , and on the other hand, the elastic restoring force of the tension spring 72 to the movable shaft 71 can make the resistance toothed disc 76 engage with the stopper 73 .

When the curtain body 16 is to be unfolded, as shown in Figure 5 , first apply force to pull the lower beam 14 downwards, so that each transmission rope 60 is stretched by the lower beam 14, and will drive the transmission rope 60 in the process of being stretched. The second transmission wheel 50 rotates, and then the second transmission wheel 50 will drive the first transmission wheel 30 to rotate, so that the coil spring 40 is retracted from one of the first transmission wheels 30 to the other first transmission wheel 30 to accumulate its own elasticity. Restoration force, on the other hand, will pull resistance wheel 74 simultaneously in the process that transmission rope 60 is stretched, and resistance wheel 74 drives movable shaft 71 to move away from the direction of second transmission wheel 50, once the guide block of movable shaft 71 75 against the outer ends of the upper and lower guide grooves 23, 27 of the fixed seat 20, as shown in Figure 3, the resistance toothed disc 76 of the resistance wheel 74 will be separated from the stopper 73, so that the resistance wheel 74 It can be pulled by the transmission rope 60 to rotate around the movable shaft 71. At the same time, the tension spring 72 will also be stretched by the guide block 75 of the movable shaft 71 to accumulate its own elastic recovery force. When the curtain body 16 is unfolded to a predetermined position Then release the pulling force applied to the lower beam 14. At this time, the tension spring 72 will pull the movable shaft 71 by its own elastic restoring force, so that the resistance wheel 74 moves toward the second transmission wheel 50 along with the movable shaft 71. Once the movable shaft 71 When the guide block 75 abuts against the inner ends of the upper and lower guide grooves 23, 27 of the fixed seat 20, as shown in FIG. , the resistance wheel 74 will stop rotating. At this time, the transmission rope 60 can utilize the frictional resistance generated between the resistance wheel 74 and present a state of static force balance with the elastic restoring force of the coil spring 40, so that the curtain body 16 Can be stably maintained in the unfolded state.

When the curtain body 16 is to be folded, as shown in FIG. 6 , first apply force to push the lower beam 14 upwards, so that the transmission rope 60 becomes a relaxed state to reduce the frictional resistance with the resistance wheel 74. At this time, The elastic recovery force of the coil spring 40 will force the two first transmission wheels 30 to rotate in opposite directions at the same time by the thrust of the user, and will drive the second transmission wheel 50 to rotate during the reverse rotation of the first transmission wheels 30, so that The second transmission wheel 50 begins to retract the transmission rope 60. During the process of the transmission rope 60 being retracted, the resistance wheel 74 will be connected to the stopper 73 by the pulling force exerted by the tension spring 72 on the movable shaft 71. Interlocked with each other, that is, the resistance wheel 74 will remain in the state of stopping rotation. When the curtain body 16 is fully retracted, the thrust applied to the lower beam 14 is released, so that the transmission rope 60 is tightly wound around the resistance wheel 74 again. The static force balance will appear again between the frictional resistances, so that the curtain body 16 is stably kept in the retracted state.

In summary, the curtain body positioning mechanism 18 of the present invention is mainly composed of the first and second transmission wheels 30, 50 used to retract the transmission rope 60 and the resistance wheel 74 used to control the movement of the transmission rope 60. Integrating together, compared with the known technology, it can effectively simplify the structure and reduce the difficulty of assembly. In addition, the friction resistance generated between the transmission rope 60 and the resistance wheel 74 and the resistance wheel 74 and the stopper 73 are used during operation. The clamping relationship between the curtain body 16 provides a good positioning effect, so as to effectively solve the problem of the curtain body 16 rising after unfolding and the problem of drooping when it is folded, so as to achieve the purpose of increasing the convenience of use.

Claims (5)

1. A curtain body positioning mechanism for a cordless curtain, comprising: A fixing base, the two ends of the fixing base respectively have an upper guide groove and a lower guide groove, and the upper and lower guide grooves correspond to each other; Two first transmission wheels are rotatably arranged on the fixed seat and engaged with each other; a coil spring connected to the two first transmission wheels and selectively wound on one of the two first transmission wheels; Two second transmission wheels are rotatably arranged on the fixed seat and engaged with one of the first transmission wheels respectively; Two transmission ropes, one end of each transmission rope is connected to the second transmission wheel; and A resistance unit has two movable shafts, at least one tension spring, two stoppers, and two resistance wheels, and the top and bottom ends of each movable shaft are movably embedded in the upper and lower guide grooves of the fixed seat , the tension spring connects the two movable shafts, each of the stoppers is arranged on the fixed seat and is located between the second transmission wheel and the movable shaft, each of the resistance wheels is rotatably sleeved on one of the movable shafts and is A circle of the transmission rope makes each of the resistance wheels separate from the stopper by the pulling force of the transmission rope and engage with the stopper by the elastic recovery force of the tension spring. 2. The curtain body positioning mechanism of the cordless curtain according to claim 1, wherein the top and bottom ends of each movable shaft have a guide block respectively, and the two guide blocks are respectively embedded in the top and bottom of the fixed seat. In the lower guide groove, the length of each guide block is less than the length of the upper and lower guide grooves. 3. The curtain body positioning mechanism of the cordless curtain according to claim 2, wherein the number of the tension springs is two, and the two tension springs are respectively connected between the guide blocks of the two movable shafts. 4. The curtain body positioning mechanism of the cordless curtain according to claim 1, wherein the stopper is a rod body, each of the resistance wheels has two resistance toothed discs and a movable shaft connecting the two resistance toothed discs, the Two resistance chainrings are detachably clamped on the stopper, and the movable shaft is surrounded by a transmission rope. 5. The curtain body positioning mechanism of the cordless curtain according to claim 4, wherein, the two ends of the fixing seat respectively have an upper fixing hole and a lower fixing hole, the upper and lower fixing holes correspond to each other, and the retaining The top and bottom ends of the stopper are respectively inserted and fixed in the upper and lower fixing holes.