CN107386943B - One-way drive mechanism for cordless curtains - Google Patents

Abstract

A one-way transmission mechanism for a cordless curtain mainly includes two mutually meshing coil spring gears and a coil spring connected between the two coil spring gears, each coil spring gear meshes with a cord pull gear, each cord pull gear is connected with a cord pull, each cord pulls around a clutch wheel, and each clutch wheel is provided with a positioning member. Therefore, when the user releases the force on the curtain during the process of unfolding or closing the curtain, the cord will be driven by the elastic restoring force of the coil spring to drive the clutch wheel to rotate, so that the clutch wheel and the positioning member are in meshing state, and the curtain body is positioned at this time.

Description

One-way drive mechanism for cordless curtains

technical field

The invention relates to a cordless curtain, in particular to a one-way transmission mechanism for a cordless curtain.

Background technique

General curtains can be divided into cord-drawn and cordless in structure. The so-called cord-drawn curtains mainly use a cord to drive the height of the curtain body to change in order to achieve the effect of unfolding and collapsing. Drawstring curtains use hands to push up or pull down the lower beam, so that the curtain body can be unfolded or retracted.

China Taiwan Announcement No. 263877 Patent Case and China Taiwan Announcement No. 322458 Patent Case respectively improve the transmission mechanism for driving the curtain body up and down, but the aforementioned two patent cases still cannot effectively reduce the structural complexity after improvement, and also An ideal positioning effect for the curtain body cannot be provided.

Contents of the invention

The main purpose of the present invention is to provide a one-way transmission mechanism for a curtain without a drawstring, which can simplify the structure and provide a good positioning effect.

In order to achieve the above purpose, the one-way transmission mechanism provided by the present invention includes a base, a retracting unit, two pull cord units, and two one-way clutch units. The retracting unit has two coil spring gears and a coil spring. The two coil spring gears are rotatably arranged on the base and engaged with each other. The coil springs are connected to the two coil spring gears and can pass through the two coil spring gears. The rotation of the gear is wound on one of the coil spring gears; each cord unit has a cord gear and a cord, and the two cord gears are rotatably arranged on the base and are respectively engaged with one of the coil springs Gears, so that each of the pull rope gears can rotate synchronously with the coil spring gear that it engages with, and one end of each of the pull ropes is connected to a pull rope gear, so that each of the pull ropes can be wound by the rotation of the pull rope gear Released from the pull rope gear or from the pull rope gear; each of the one-way clutch units has a clutch wheel and a positioning piece, each of the clutch wheels is rotatably arranged on the base and is surrounded by a pull rope circle, so that each of the clutch wheels can be driven by the pull cord to rotate. In addition, one end of each of the clutch wheels has an inner ring tooth, and each of the positioning parts is fixed on the base and has an elastic arm and a ratchet. A tooth portion, the ratchet portion is arranged at one end of the elastic arm and unidirectionally engages with an inner ring tooth portion of the clutch wheel.

Wherein the two ends of the base respectively have a polygonal convex part, and one end of each clutch wheel has a containing groove, the groove wall of the containing groove is provided with the inner ring tooth part, and each positioning part is arranged on one of the clutch wheels. There is also a positioning part and a polygonal hole located in the positioning part in the accommodation groove of the tooth part, and each positioning piece is clamped to a polygonal convex part of the base through the polygonal hole; one end of the elastic arm Connected to the outer peripheral edge of the positioning portion, the ratchet portion is disposed at the other opposite end of the elastic arm.

Wherein the elastic arm of each positioning member has a first arc section and a second arc section, the curvature of the first arc section is greater than the curvature of the second arc section, and one end of the first arc section is connected to On the outer peripheral edge of the positioning portion, the other end of the first arc section is connected to one end of the second arc section, and the other end of the second arc section is connected to the ratchet part.

The number of elastic arms of the positioning member and the number of ratchet parts of the positioning member are three, the three elastic arms are rotationally symmetrical around the polygonal hole, and the three ratchet parts are respectively connected to one end of the elastic arms.

Wherein the base has a base plate and a top plate covering the base plate, the two ends of the top surface of the base plate and the two ends of the bottom surface of the top plate respectively have a lower limit groove and an upper limit groove, each of the clutch wheel The two ends of the top and the bottom are respectively rotatably embedded in the upper limit groove of the top plate and the lower limit groove of the bottom plate.

From the above, it can be seen that when the user releases the pull-down force or push-up force on the lower beam during the process of unfolding or retracting the curtain body connected to the lower beam, the pull cord will be subjected to the elastic recovery force of the coil spring And drive this clutch wheel to rotate, once the inner ring tooth portion of this clutch wheel meshes with the ratchet portion of this locator, this stay rope will stop action through the frictional resistance between this clutch wheel, now this moment The curtain body is positioned.

The detailed structure, features, assembly or usage of the one-way transmission mechanism provided by the present invention will be described in the subsequent detailed description of the implementation. However, those with ordinary knowledge in the field of the present invention should understand that the detailed description and the specific examples listed for implementing the present invention are only for illustrating the present invention, and are not intended to limit the scope of patent application of the present invention.

Description of drawings

In order to illustrate the present invention more clearly, a preferred embodiment will be described in detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a perspective view of the appearance of the present invention.

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

Fig. 3 is a partial top view of the present invention, mainly showing that the clutch wheel rotates in a first direction.

Fig. 4 is similar to Fig. 3, mainly showing that the clutch wheel rotates in the second direction.

Fig. 5 is a plan view of the present invention used with curtains, mainly showing the state of unfolding the curtain body.

Fig. 6 is similar to Fig. 5, and mainly shows the state of folding the curtain body.

Detailed ways

Please refer to FIG. 1 and FIG. 2 , the one-way transmission mechanism 10 of the present invention includes a base 20 , a retracting unit 30 , two pull cord units 40 , and two one-way clutch units 50 .

The base 20 is configured to be installed in an upper beam 12 and has a bottom plate 21 and a top plate 22 covering the bottom plate 21 . The top surface of the base plate 21 has six lower bosses 23, the bottom surface of the top plate 22 has six upper bosses 24, and each upper boss 24 is correspondingly connected to a lower boss 23, and the two ends of the top surface of the bottom plate 21 are respectively There is a lower limiting groove 25, and the two ends of the bottom surface of the top plate 22 respectively have an upper limiting groove 26, and the upper and lower limiting grooves 26, 25 correspond to each other. In addition, two ends of the bottom surface of the top plate 22 respectively have a polygonal protrusion 27 , the polygonal protrusion 27 is located in the upper limit groove 26 and connected to the outer periphery of the upper protrusion 24 .

The retracting unit 30 has two coil spring gears 32 and a coil spring 34. The coil spring gear 32 is rotatably sleeved on the upper and lower protrusions 24, 23 of the base 20 and engaged with each other. The coil spring 34 is connected to Between the two coil spring gears 32 , the coil spring 34 can be coiled on one of the coil spring gears 32 by the relative rotation of the two coil spring gears 32 .

Each rope unit 40 has a rope gear 42 and a rope 44 . The pull cord gear 42 is rotatably sleeved on the upper and lower bosses 24, 23 of the base 20 and engaged with a coil spring gear 32, so that the draw cord gear 42 can rotate synchronously with the coil spring gear 32 engaged with it, One end of the stay cord 44 is connected to the lower beam 14, and the other end of the stay cord 44 is connected to a stay cord gear 42, so that the stay cord 44 can be wound around the stay cord gear 42 or released from the stay cord gear 42 by the rotation of the stay cord gear 42. come out.

Each one-way clutch unit 50 has a clutch wheel 51 and a positioning member 54 . The top and bottom ends of the clutch wheel 51 are respectively rotatably embedded in the upper and lower limit grooves 26, 25 of the base 20 and are surrounded by a pull cord 44. The top end of the clutch wheel 51 has a receiving groove 52 and an inner ring tooth portion 53, the inner ring tooth portion 53 is arranged on the groove wall of the accommodating groove 52; The polygonal hole 56, the positioning piece 54 is clamped to the polygonal protrusion 27 of the top plate 22 of the base 20 through the polygonal hole 56, so that the positioning piece 54 is kept in a fixed and non-rotating state. In addition, the positioning piece 54 has three elastic arms 57 , the three elastic arms 57 are rotationally symmetrical around the polygonal hole 56 and have a first arc segment 571 and a second arc segment 572 respectively, the curvature of the first arc segment 571 is greater than that of the second arc segment 572 curvature, and one end of the first arc segment 571 is connected to the outer periphery of the positioning portion 55, the other end of the first arc segment 571 is connected to one end of the second arc segment 572, and the other end of the second arc segment 572 is connected to a The ratchet part 58, the positioning member 54 forms a one-way engagement with the inner ring tooth part 53 of the clutch wheel 51 through the ratchet part 58, that is to say, when the clutch wheel 51 rotates in a first direction D1, as shown in FIG. 3 , the inner ring tooth portion 53 of the clutch wheel 51 will engage with the ratchet portion 58 of the positioning member 54, so that the clutch wheel 51 cannot continue to rotate. When the clutch wheel 51 rotates toward a second direction D2, as shown in Figure 4, the positioning The elastic arm 57 of the member 54 will be elastically deformed because the inner ring tooth portion 53 of the clutch wheel 51 pushes against the ratchet portion 58 of the positioning member 54, so that the inner ring tooth portion 53 of the clutch wheel 51 cannot be engaged with the position of the positioning member 54. The ratchet portion 58 , at this time, the clutch wheel 51 can freely rotate relative to the positioning member 54 .

When a curtain body 16 located between the upper and lower beams 12, 14 will be launched, as shown in Figure 5, at first the lower beam 14 is pulled downwards with force, so that the stay rope 44 is pulled by the lower beam 14 and pulled from the lower beam 14. The rope gear 42 is gradually released. When the stay rope 44 is pulled by the lower beam 14, the clutch wheel 51 is driven to rotate in the second direction D2 shown in FIG. Then the pull cord gear 42 will simultaneously drive the coil spring gear 32 that is engaged with it to rotate together, so that the coil spring 34 accumulates elastic restoring force through the relative rotation of the two coil spring gears 32 until the curtain body 16 is deployed to an appropriate position. Then release the pulling force on the lower beam 14. At this time, the coil spring gear 32 will be affected by the elastic recovery force of the coil spring 34 to drive the pull rope gear 42 to rotate in reverse, and then the pull rope gear 42 will rotate in the opposite direction. A small section of the stay rope 44 will be rolled up in the middle, so that the stay rope 44 can drive the clutch wheel 51 to rotate in the first direction D1 as shown in Figure 3. Once the clutch wheel 51 turns to allow the inner ring gear 53 to engage with the positioning member When the ratchet part 58 of 54, clutch wheel 51 can stop rotating immediately, and the stay cord 44 of this moment just can not continue to be rolled up by stay cord gear 42 by the frictional resistance between clutch wheel 51, coil spring gear 32 The pull cord gear 42 will also stop rotating, so that the positioning of the curtain body 16 in the unfolding process is completed.

When the curtain body 16 is to be retracted, the user needs to apply force to push the lower beam 14 upwards, as shown in Figure 6, so that the stay cord 44 becomes a relaxed state and reduces the frictional resistance between the clutch wheel 51 and the clutch wheel 51. The coil spring 34 will drive the two coil spring gears 32 to rotate in the opposite direction at the same time with the assistance of the user's thrust. When the rope gear 42 rotates, it will start to retract the rope 44 until the curtain body 16 is retracted to a proper position, and then the user releases the thrust applied to the lower beam 14, so that the rope 44 is tightly wound around the clutch wheel 51 again. Since the inner ring tooth portion 53 of the clutch wheel 51 and the ratchet portion 58 of the locator 54 are kept in an engaged state, the pull cord 44 cannot continue to be drawn by the pull cord through the frictional resistance between the clutch wheel 51 and the clutch wheel 51. When the gear 42 is retracted, the coil spring gear 32 and the pull cord gear 42 will also stop rotating, so that the positioning of the curtain body 16 in the retracting process is completed.

To sum up, the one-way transmission mechanism 10 of the present invention utilizes the one-way clutch unit 50 to provide a good positioning effect on the curtain body 16. Overall, it has a simple structure and configuration, and the stability and smoothness of operation are also very good. Therefore, the purpose of improving the transmission effect can be achieved.

Claims (5)

1. A one-way transmission mechanism for a cordless curtain, comprising: a base; A retracting unit has two coil spring gears and a coil spring. The two coil spring gears are rotatably arranged on the base and engaged with each other. The coil spring is connected to the two coil spring gears and can be selectively wound. on one of the coil spring gears; The two pull cord units respectively have a pull cord gear and a pull cord. The two pull cord gears are rotatably arranged on the base and are respectively engaged with a coil spring gear. One end of each pull cord is connected to a pull cord. a gear such that each of the stay cords can be wound around or released from the stay cord gear by rotation of the stay cord gear; and Two one-way clutch units respectively have a clutch wheel and a positioning member, the two clutch wheels are rotatably arranged on the base and are respectively surrounded by a pull cord, and one end of each clutch wheel has an inner ring The tooth part, each positioning piece is fixed on the base and has at least one elastic buttock and at least one ratchet part, the ratchet part is arranged at one end of the elastic arm and unidirectionally engages with an inner ring of the clutch wheel Teeth. 2. The one-way transmission mechanism for cordless curtains as claimed in claim 1, wherein both ends of the base have a polygonal protrusion respectively, and one end of each clutch wheel has a receiving groove, and the receiving groove The groove wall is provided with the inner ring tooth portion, and each positioning piece is set in a housing groove of the clutch tooth portion and also has a positioning portion and a polygonal hole arranged in the positioning portion, and each positioning piece passes through the polygonal hole. The hole is fastened to the polygonal convex part of the base; one end of the elastic arm is connected to the outer peripheral edge of the positioning part, and the ratchet part is arranged at the other opposite end of the elastic arm. 3. The one-way transmission mechanism for cordless curtains as claimed in claim 2, wherein the elastic arm of each positioning member has a first arc segment and a second arc segment, and the curvature of the first arc segment is greater than the curvature of the second arc segment, one end of the first arc segment is connected to the outer periphery of the positioning part, the other end of the first arc segment is connected to one end of the second arc segment, and the second arc segment The other end of the segment is connected to the ratchet. 4. The one-way transmission mechanism of the cordless curtain as claimed in claim 2, wherein the number of the elastic arms of the positioning member and the number of the ratchet parts of the positioning member are three, and the three elastic arms are centered on the polygonal hole Being rotationally symmetrical, the three ratchet parts are respectively connected to one end of the elastic arm. 5. The one-way transmission mechanism for cordless curtains as claimed in claim 1, wherein the base has a bottom plate and a top plate covering the bottom plate, the two ends of the top surface of the bottom plate and the bottom surface of the top plate The two ends respectively have a lower limit groove and an upper limit groove, and the top and bottom ends of each clutch wheel are respectively rotatably embedded in the upper limit groove of the top plate and the lower limit groove of the bottom plate.