CN211230168U - Mute curtain head for lifting curtain - Google Patents

Abstract

The utility model discloses a mute curtain head for a lifting curtain, which belongs to the field of curtain accessories. The utility model discloses a mute (window) curtain system head, which comprises an outer shell, the end cover, flexible stretching strap, the drawstring wheel, planetary reduction mechanism, torsional spring self-locking mechanism and axle core spare, flexible stretching strap is annular thin wall structure, and be equipped with a plurality of drawstring holes along the even interval of length direction on flexible stretching strap, enclose into the stretching strap groove with flexible stretching strap looks adaptation by the flange of both sides on the lateral surface of drawstring wheel, be equipped with a plurality of dogtooths along the even interval of circumference on the cell wall of drawstring groove, flexible stretching strap is around the drawstring inslot of locating the drawstring wheel, and the dogtooth of stretching strap inslot is located corresponding drawstring downthehole. The utility model discloses utilize flexible stretching strap and drawstring wheel to replace and draw the pearl structure, the drive of the dogtooth meshing on the drawstring hole on the flexible stretching strap and the drawstring wheel, meshing transmission noise is little, and the friction between flexible stretching strap and the first casing of system and collision noise are little, has thoroughly solved the noise problem of drawing pearl formula (window) curtain system head from the root.

Description

Mute curtain head for lifting curtain

Technical Field

The utility model relates to a curtain system head, more specifically say, relate to a silence curtain system head that is used for sun blind and roll up curtain.

Background

With the continuous development of life and science and technology, the quality of life of people is continuously improved, and the curtain is widely applied to places such as families, classrooms, offices and the like as an important means for shading sunlight and keeping indoor privacy, and becomes an indispensable indoor decoration with perfect combination of functionality and decoration in a living room.

The existing manual curtain mainly comprises a left-right opening-closing type pull curtain, a manual lifting type blind curtain and the like, the manual lifting type blind curtain is frequently applied in offices and classrooms, and the manual lifting type blind curtain is also frequently used in some smaller windows in families. The existing lifting blind and roller blind are driven by the pull bead type curtain head, for example, a horizontal blind disclosed in chinese patent application No. 201580028063.0, which uses the pull bead type curtain head to control the lifting of the curtain. The bead-pulling type curtain head generally comprises a bead pulling body, a bead pulling chain wheel, a planetary reducer, a torsional spring self-locking mechanism and the like, and the specific structure can be seen in patent applications such as Chinese patent numbers ZL201621369786.5 and ZL 201620594016.4.

However, in the practical use process, the pulling noise of the bead-pulling type curtain head is very loud, and particularly when the bead-pulling type curtain head is used in classrooms, offices and other occasions needing silence, the pulling noise brings great interference to the work and study of people. Research finds that noise of the existing bead-pulling type curtain head making mainly comes from meshing noise between beads on a bead-pulling rope and a bead-pulling chain wheel and friction and collision noise between the beads and a head making shell, in order to reduce the pulling noise, the 'aluminum shutter head making' disclosed by the Chinese patent number ZL201821378562.X provides a mode of arranging a rubber pad matched with the beads on ribs of the head making chain wheel, and the rubber pad is utilized to play a role in reducing the noise.

Disclosure of Invention

1. Technical problem to be solved by the utility model

The utility model aims to overcome the defect of large use noise of the existing bead-pulling type curtain head, and provides a mute curtain head for a lifting type curtain, which adopts the technical scheme of the utility model, utilizes a flexible drawstring and a drawstring wheel to replace the existing bead-pulling structure, a drawstring hole on the flexible drawstring and a convex tooth on the drawstring wheel are meshed for transmission, the meshing transmission noise is small, the friction and collision noise between the flexible drawstring and the head making shell is small, and the noise problem of the bead-pulling type curtain head is thoroughly solved from the root; and the upper and lower parts of the pull belt movable opening are also provided with the rollers, so that the frictional resistance between the flexible pull belt and the head making shell is further reduced, and the pulling is easier and more labor-saving.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model relates to a mute curtain head for a lifting curtain, which comprises a shell, an end cover, a flexible drawstring, a drawstring wheel, a planetary reduction mechanism, a torsional spring self-locking mechanism and a shaft core piece, the shell is connected with the end cover to form an installation cavity, the drawstring wheel, the planetary speed reducing mechanism, the torsion spring self-locking mechanism and the shaft core piece are coaxially arranged in the installation cavity, the flexible drawstring is arranged on the drawstring wheel in a matching way, the flexible drawstring is in an annular thin-wall structure, a plurality of drawstring holes are evenly arranged on the flexible drawstring at intervals along the length direction, drawstring grooves matched with the flexible drawstring are enclosed by flanges at two sides on the outer side surface of the drawstring wheel, a plurality of convex teeth matched with the drawstring holes are evenly arranged on the groove wall of the drawstring groove at intervals along the circumferential direction, the flexible drawstring is wound in a drawstring groove of the drawstring wheel, and the convex teeth in the drawstring groove are positioned in the corresponding drawstring holes.

Furthermore, the upper ends of the convex teeth and/or the inner side of the drawstring hole are/is provided with an inclined chamfer which is convenient for the convex teeth to be inserted into the drawstring hole.

Furthermore, the inner side of the flange of the drawstring wheel is provided with an inclined plane which inclines outwards, and two sides of the inner side of the flexible drawstring are respectively provided with a chamfer.

Furthermore, the flexible drawstring is made of rubber.

Furthermore, the shell and the two sides of the lower end of the installation cavity enclosed by the end cover are respectively provided with a drawstring movable opening for the flexible drawstring to penetrate out, the upper part of the drawstring movable opening is provided with an upper roller matched with the outer side surface of the flexible drawstring, and the lower part of the drawstring movable opening is provided with a lower roller matched with the inner side surface of the flexible drawstring.

Furthermore, a mandrel is arranged on the inner side of the end cover, the belt pulley is axially and rotatably arranged on the mandrel, a sun gear is fixedly connected to one side of the belt pulley, which is far away from the end cover, an inner gear ring is arranged in the shell, a planet gear arranged on the planet carrier is arranged in the inner gear ring, and the planet gear is respectively meshed with the sun gear and the inner gear ring to form a planet speed reducing mechanism; the end, far away from the end cover, of the shell is provided with a sleeve portion coaxial with the inner gear ring, the shaft core piece is axially and rotatably mounted in the sleeve portion, one end, close to the planet carrier, of the shaft core piece is provided with a shaft core arc-shaped flange, one side, close to the shaft core piece, of the planet carrier is provided with an input end arc-shaped flange, the input end arc-shaped flange is in staggered butt joint with the shaft core arc-shaped flange, a notch is formed in the matching position of the input end arc-shaped flange and the two sides of the shaft core arc-shaped flange, a torsion spring is sleeved outside the input end arc-shaped flange and the shaft core arc-shaped flange, two ends of the torsion spring are provided with torsion spring hooks which are inwards inserted into the notches and embrace the input end arc-shaped flange, and the outer.

Furthermore, the reduction ratio of the planetary reduction mechanism is 1: 4-1: 6.

Furthermore, a supporting shaft is coaxially arranged on one side of the planet carrier close to the shaft core member, and the end part of the supporting shaft is inserted into a shaft hole on the shaft core member.

Furthermore, the drawstring wheel is arranged on the mandrel of the end cover through a drawstring wheel bearing, and the mandrel component is arranged in the sleeve part of the shell through a mandrel bearing.

Furthermore, the front end of the shaft core member is provided with a connecting end which extends out of the sleeve part; the inner side wall of the shell is also provided with a stop block positioned on the upper part of the belt pulling wheel.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following beneficial effect:

(1) the utility model relates to a silent curtain head for a lifting curtain, which comprises a shell, an end cover, a flexible drawstring, a drawstring wheel, a planetary speed reducer, a torsional spring self-locking mechanism and a shaft core member, wherein the flexible drawstring is arranged on the drawstring wheel in a matching way, the flexible drawstring is of an annular thin-wall structure, a plurality of drawstring holes are uniformly arranged on the flexible drawstring along the length direction at intervals, a drawstring groove matched with the flexible drawstring is enclosed by flanges at two sides on the outer side surface of the drawstring wheel, a plurality of convex teeth matched with the drawstring holes are uniformly arranged on the groove wall of the drawstring groove along the circumferential direction at intervals, the flexible drawstring is wound in the drawstring groove of the drawstring wheel, the convex teeth in the drawstring groove are positioned in corresponding drawstring holes, the flexible drawstring and the drawstring wheel are utilized to replace the prior drawstring bead structure, the drawstring holes on the, the friction and collision noise between the flexible drawstring and the head making shell is small, so that the noise problem of the bead-pulling type curtain head making is radically solved, and the bead-pulling type curtain head making device is particularly suitable for occasions needing silence, such as classrooms, offices and the like;

(2) the utility model relates to a mute curtain head for a lifting curtain, the upper end of a convex tooth and/or the inner side of a drawstring hole are/is provided with an inclined chamfer which is convenient for the convex tooth to be inserted into the drawstring hole; the inner side of the flange of the drawstring wheel is provided with an inclined plane which inclines outwards, and two sides of the inner side of the flexible drawstring are respectively provided with a chamfer; the flexible drawstring and the drawstring wheel are more stably and reliably matched, the meshing is tight and natural, and the problem that the flexible drawstring slips on the drawstring wheel is effectively avoided;

(3) the utility model discloses a mute curtain head for a lifting curtain, the flexible drawstring is made of rubber material, compared with the existing bead-pulling structure, the manufacture is simple and convenient, and the collision noise generated by the flexible drawstring shaking is smaller;

(4) the utility model discloses a silence (window) curtain system head for over-and-under type (window) curtain, its shell and end cover enclose installation cavity lower extreme both sides have respectively and are used for making the flexible stretching strap wear out stretching strap movable mouth, the upper portion of stretching strap movable mouth is equipped with and is used for the upper roller with the lateral surface matched with of flexible stretching strap, the lower part of stretching strap movable mouth is equipped with and is used for the lower roller with the medial surface matched with of flexible stretching strap, utilize the upper and lower gyro wheel of stretching strap movable mouth, further reduced the frictional resistance between flexible stretching strap and the system head shell, make the pulling more light laborsaving;

(5) the utility model discloses a mute curtain head for a lifting curtain, which has the advantages that the planetary reduction mechanism is organically combined with the torsional spring self-locking mechanism, the structure is simpler and more compact, and the assembly of the head is simpler and more convenient;

(6) the utility model discloses a silence curtain system head for over-and-under type (window) curtain, its planet reduction gear of speed reduction mechanism is 1:4 ~ 1:6, makes the lifting speed of (window) curtain moderate, and has reduced the pulling force of flexible stretching strap, makes the operation more light laborsaving;

(7) the utility model discloses a silence curtain system head for lifting curtain, one side of the planet carrier near the axle core piece is coaxially provided with a support axle, the end part of the support axle is inserted into the axle hole on the axle core piece, so that the coaxial matching precision of the planet carrier and the axle core piece is higher, and the rotation is smoother;

(8) the utility model discloses a silence curtain system head for over-and-under type (window) curtain, its drawstring wheel installs on the dabber of end cover through drawstring wheel bearing, and axle core spare installs in the sleeve portion of shell through axle core bearing, has further improved the rotational stability of curtain system head internals, is favorable to reducing internal transmission noise;

(9) the utility model relates to a mute curtain head for a lifting curtain, the front end of a shaft core piece is provided with a connecting end head extending out of a sleeve part, which is convenient for connecting the curtain head with a curtain lifting control mechanism; the inner side wall of the shell is also provided with a stop block positioned on the upper part of the belt pulley, so that the flexible belt pulley is further prevented from slipping on the belt pulley, and the operation stability of curtain head making is ensured.

Drawings

Fig. 1 is a schematic view of an assembly structure of a silent curtain head for a lifting curtain of the present invention;

FIG. 2 is a schematic view of the angular disassembled structure of FIG. 1;

FIG. 3 is a schematic view of the disassembled structure at another angle of FIG. 1;

fig. 4 is a schematic cross-sectional view of a silent curtain head of the present invention;

FIG. 5 is a schematic cross-sectional view taken along line A-A of FIG. 4;

fig. 6 is a schematic sectional view in the direction B-B in fig. 4.

The reference numerals in the schematic drawings illustrate:

1. a housing; 1-1, an inner gear ring; 1-2, a stop block; 1-3, a sleeve portion; 1-4, pulling a movable opening of the belt; 2. an end cap; 2-1, mandrel; 3. a shaft core member; 3-1, connecting end heads; 3-2, an arc-shaped flange of the shaft core; 4. a flexible drawstring; 4-1, drawing a belt hole; 4-2, chamfering; 5. a belt pulling wheel; 5-1, convex teeth; 5-2, blocking edges; 5-3, sun gear; 6. a planet carrier; 6-1, supporting a shaft; 6-2, an input end arc flange; 7. a planet wheel; 8. a torsion spring; 8-1, a torsion spring hook; 9. a pulley bearing; 10. a shaft core bearing; 11. an upper roller; 12. and a lower roller.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Examples

Referring to fig. 1 to 4, the silent curtain head for a lifting curtain of the present embodiment includes a housing 1, an end cover 2, a flexible pull belt 4, a pull belt wheel 5, a planetary reduction mechanism, a torsion spring self-locking mechanism and a shaft core 3, wherein the housing 1 is connected with the end cover 2 to form an installation cavity, and the housing 1 and the end cover 2 can be specifically connected by screws, which facilitates assembly of the curtain head; the drawstring wheel 5, the planetary speed reducing mechanism, the torsional spring self-locking mechanism and the shaft core piece 3 are coaxially arranged in the installation cavity, the flexible drawstring 4 is arranged on the drawstring wheel 5 in a matching way, the flexible drawstring 4 is pulled to drive the drawstring wheel 5 to rotate, and the rotating speed and the torque are transmitted to the shaft core piece 3 after the speed is reduced by the planetary speed reducing mechanism, so that the lifting of the curtain and the blade angle of the shutter are controlled; after the flexible drawstring 4 is loosened, the shaft core piece 3 is locked to keep the lifting position of the curtain under the action of the torsion spring self-locking mechanism. Different from the existing bead-pulling type curtain head, the flexible drawstring 4 is of an annular thin-wall structure, a plurality of drawstring holes 4-1 are uniformly arranged on the flexible drawstring 4 at intervals along the length direction, drawstring grooves matched with the flexible drawstring 4 are enclosed by flanges 5-2 at two sides on the outer side surface of the drawstring wheel 5, a plurality of convex teeth 5-1 matched with the drawstring holes 4-1 are uniformly arranged on the groove wall of the drawstring groove at intervals along the circumferential direction, the flexible drawstring 4 is wound in the drawstring groove of the drawstring wheel 5, the flexible drawstring 4 can be prevented from shifting by the flanges 5-2 at two sides, the convex teeth 5-1 in the drawstring grooves are positioned in the corresponding drawstring holes 4-1, and the drawstring holes 4-1 are matched with the convex teeth 5-1 to realize the driving of the flexible drawstring 4 to the drawstring wheel 5. Because the flexible drawstring 4 is a soft thin-wall structure, basically no meshing noise exists when the drawstring hole 4-1 is matched with the convex tooth 5-1, and the friction and collision noise between the flexible drawstring 4 and the head making shell is very small, the noise problem of the bead-pulling type curtain head making is radically solved, and the bead-pulling type curtain head making device is particularly suitable for occasions needing silence, such as classrooms, offices and the like.

In order to ensure that the flexible drawstring 4 is more stably and reliably matched with the drawstring wheel 5, in the embodiment, the upper end of the convex tooth 5-1 and/or the inner side of the drawstring hole 4-1 are/is provided with an oblique chamfer which is convenient for the convex tooth 5-1 to be inserted into the drawstring hole 4-1, and the drawstring hole 4-1 is more easily sleeved on the corresponding convex tooth 5-1 by utilizing the guiding function of the oblique chamfer; furthermore, an inclined plane inclining outwards is arranged on the inner side of the flange 5-2 of the band pulley 5, chamfers 4-2 are respectively arranged on two sides of the inner side of the flexible band 4, and the chamfers 4-2 of the flexible band 4 are matched with the inclined plane of the flange 5-2, so that the flexible band 4 is matched with the band pulley 5 more closely, meshing is tight and natural, and the problem that the flexible band 4 slips on the band pulley 5 is effectively solved. Preferably, the flexible drawstring 4 is made of rubber, and compared with the existing bead pulling structure, the bead pulling structure is simple and convenient to manufacture, and the flexible drawstring is low in collision noise caused by shaking. In addition, in order to ensure the strength and rigidity of the flexible drawstring 4, an optimal implementation mode of the flexible drawstring 4 is provided, namely, embedded pull ropes are arranged at two sides of the inner part of the flexible drawstring 4 made of rubber, so that the flexibility of the drawstring is ensured, the drawstring has stronger tensile strength and rigidity, and the influence of elastic deformation of the rubber is reduced. Of course, the flexible drawstring 4 can also be made of other flexible materials.

As shown in fig. 1, 2 and 3, in the silent curtain head for the lifting curtain of the present embodiment, two sides of the lower end of the installation cavity enclosed by the housing 1 and the end cover 2 are respectively provided with a drawstring moving opening 1-4 for the flexible drawstring 4 to penetrate out, the upper part of the drawstring moving opening 1-4 is provided with an upper roller 11 for matching with the outer side surface of the flexible drawstring 4, and the lower part of the drawstring moving opening 1-4 is provided with a lower roller 12 for matching with the inner side surface of the flexible drawstring 4. Because the flexible drawstring 4 is not vertically pulled in the using process generally, the flexible drawstring can collide and rub with the head making shell when being obliquely pulled, which is one of the factors of the noise of the head making of the existing bead-pulling type curtain, and the roller wheels at the upper part and the lower part of the drawstring movable opening 1-4 are utilized to further reduce the frictional resistance between the flexible drawstring 4 and the head making shell, so that the pulling is easier and more labor-saving, and the collision and the friction noise are avoided. The upper roller 11 and the lower roller 12 may be plastic rollers, and are mounted on the housing 1 through a rotating shaft. Referring to fig. 4, in this embodiment, a mandrel 2-1 is disposed on an inner side of an end cover 2, a pulley 5 is axially and rotatably mounted on the mandrel 2-1, a sun gear 5-3 is fixedly connected to a side of the pulley 5 away from the end cover 2, an inner gear ring 1-1 is disposed in a housing 1, a planet gear 7 mounted on a planet carrier 6 is disposed in the inner gear ring 1-1, and the planet gear 7 is respectively engaged with the sun gear 5-3 and the inner gear ring 1-1 to form a planet speed reduction mechanism. The sun wheel 5-3 may be integrally formed on the pulley wheel 5, which drives the planet wheel 7 to rotate, so that the planet wheel 7 rolls on the internal gear ring 1-1, and the planet carrier 6 is driven to rotate. The specific structure of the planetary reduction mechanism can be seen in fig. 5, and the planetary gears 7 are preferably uniformly provided with four groups on the planetary carrier 6, so that the gear transmission is more stable. The reduction ratio of the planetary reduction mechanism is preferably 1: 4-1: 6, so that the lifting speed of the curtain is moderate, the pulling force of the flexible drawstring 4 is reduced, and the operation is easier and more labor-saving. Referring to fig. 6, one end of the outer shell 1 far from the end cover 2 is provided with a sleeve portion 1-3 coaxial with an inner gear ring 1-1, a shaft core member 3 is axially and rotatably installed in the sleeve portion 1-3, one end of the shaft core member 3 close to a planet carrier 6 is provided with a shaft core arc flange 3-2, the shaft core arc flange 3-2 is in a semicircular ring shape, one side of the planet carrier 6 close to the shaft core member 3 is provided with an input end arc flange 6-2, the input end arc flange 6-2 is in a ring shape with an arc length smaller than the semicircle, the input end arc flange 6-2 is in staggered butt joint with the shaft core arc flange 3-2, a notch is formed at the matching part of the input end arc flange 6-2 and the two sides of the shaft core arc flange 3-2, and the outer side of the input end arc flange 6-, two ends of the torsion spring 8 are provided with torsion spring hooks 8-1 which are inserted into the notches inwards and embrace the arc-shaped flanges 6-2 at the input ends, and the outer side of the torsion spring 8 is expanded on the inner side wall of the sleeve part 1-3 to form a torsion spring self-locking mechanism. When the flexible drawstring 4 is pulled, the flexible drawstring 4 drives the drawstring wheel 5 to rotate, the planet carrier 6 is driven to rotate through the sun gear 5-3, the planet carrier 6 rotates to enable the arc-shaped flange 6-2 at the input end to rotate towards one side, the arc-shaped flange 6-2 at the input end pulls the torsion spring hook 8-1 at one side, the torsion spring 8 is enabled to be tightened inwards to be separated from the inner side wall of the sleeve part 1-3, and then the arc-shaped flange 3-2 of the shaft core is driven to rotate together, so that the rotary driving of the shaft core piece 3 is; when the flexible drawstring 4 is loosened, the input end arc-shaped flange 6-2 releases the torsion spring hook 8-1 to enable the torsion spring 8 to be expanded on the inner side wall of the sleeve part 1-3 again, and the shaft core arc-shaped flange 3-2 acts on the torsion spring hook 8-1 under the action of the gravity of the curtain, so that the torsion spring 8 tends to expand outwards, the torsion spring 8 is more tightly fitted with the inner side wall of the sleeve part 1-3, and the self-locking effect is achieved. The specific principle of the torsion spring self-locking mechanism can refer to a torsion spring bidirectional transmission self-locking device disclosed in Chinese patent number ZL 201220030193.1.

As shown in fig. 3 and 4, in order to ensure the transmission stability of the curtain head, a support shaft 6-1 is coaxially arranged on one side of the planet carrier 6 close to the shaft core member 3, and the end part of the support shaft 6-1 is inserted into a shaft hole on the shaft core member 3, so that the coaxial matching precision of the planet carrier 6 and the shaft core member 3 is higher, and the rotation is smoother. The support shaft 6-1 and the input end arc-shaped flange 6-2 may be integrally formed on the planet carrier 6. In addition, the drawstring wheel 5 is arranged on the core shaft 2-1 of the end cover 2 through a drawstring wheel bearing 9, and the core shaft part 3 is arranged in the sleeve part 1-3 of the shell 1 through a core shaft bearing 10, thereby further improving the rotation stability of the internal parts of the curtain head making and being beneficial to reducing the internal transmission noise. In addition, the front end of the shaft core part 3 is provided with a connecting end 3-1 extending out of the sleeve part 1-3, and the connecting end 3-1 is provided with a square connecting hole, so that the curtain head is conveniently connected with a curtain lifting control mechanism. A stop block 1-2 (shown in figure 2) positioned at the upper part of the drawstring wheel 5 is also arranged on the inner side wall of the shell 1, and the stop block 1-2 is used for stopping the flexible drawstring 4, so that the flexible drawstring is further prevented from slipping on the drawstring wheel, and the operation stability of curtain head making is ensured.

The utility model discloses a silence (window) curtain system head for over-and-under type (window) curtain utilizes flexible stretching strap and band pulley to replace current draw pearl structure, and the drive of the meshing of the dogtooth on the band pulley of the drawstring hole on the flexible stretching strap and the band pulley, and meshing transmission noise is little, and the friction and the collision noise between flexible stretching strap and the system head casing are little, has thoroughly solved the noise problem of drawing pearl formula (window) curtain system head from the root; in addition, the upper part and the lower part of the movable opening of the drawstring are also provided with the rollers, so that the frictional resistance between the flexible drawstring and the head making shell is further reduced, and the pulling is easier and more labor-saving; the device has the advantages of simple and compact structure, simple and convenient assembly and the like, and is particularly suitable for occasions needing silence, such as classrooms, offices and the like.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without creatively designing the similar structural modes and embodiments to the technical solutions, they should belong to the protection scope of the present invention.

Claims (10)

1. The utility model provides a silence (window) curtain system head for over-and-under type (window) curtain, includes shell (1), end cover (2), flexible stretching strap (4), drawstring wheel (5), planet reduction gears, torsional spring self-locking mechanism and axle core piece (3), shell (1) be connected with end cover (2) and form the installation cavity, drawstring wheel (5), planet reduction gears, torsional spring self-locking mechanism and axle core piece (3) coaxial arrangement in foretell installation cavity, flexible stretching strap (4) cooperation install on drawstring wheel (5), its characterized in that: the flexible drawstring (4) is of an annular thin-wall structure, a plurality of drawstring holes (4-1) are formed in the flexible drawstring (4) at equal intervals along the length direction, the outer side surface of the drawstring wheel (5) is surrounded by flanges (5-2) on two sides to form a drawstring groove matched with the flexible drawstring (4), a plurality of convex teeth (5-1) matched with the drawstring holes (4-1) are formed in the groove wall of the drawstring groove at equal intervals along the circumferential direction, the flexible drawstring (4) is wound in the drawstring groove of the drawstring wheel (5), and the convex teeth (5-1) in the drawstring groove are located in the corresponding drawstring holes (4-1).

2. The silent window covering head for a window covering of claim 1, wherein: the upper end of the convex tooth (5-1) and/or the inner side of the belt hole (4-1) are/is provided with an inclined chamfer which is convenient for the convex tooth (5-1) to be inserted into the belt hole (4-1).

3. A silent window covering head for a lifting window covering as claimed in claim 2, wherein: the inner side of the flange (5-2) of the drawstring wheel (5) is provided with an inclined plane which inclines outwards, and the two sides of the inner side of the flexible drawstring (4) are respectively provided with a chamfer (4-2).

4. A silent window covering head for a lifting window covering as claimed in claim 3, wherein: the flexible drawstring (4) is made of rubber materials.

5. A silent window covering head for a window covering according to any one of claims 1 to 4, wherein: the flexible stretching strap fixing device is characterized in that stretching strap movable openings (1-4) used for enabling the flexible stretching straps (4) to penetrate out are respectively arranged on two sides of the lower end of an installation cavity surrounded by the shell (1) and the end cover (2), upper idler wheels (11) used for being matched with the outer side faces of the flexible stretching straps (4) are arranged on the upper portions of the stretching strap movable openings (1-4), and lower idler wheels (12) used for being matched with the inner side faces of the flexible stretching straps (4) are arranged on the lower portions of the stretching strap movable openings (1-4).

6. The silent window covering head for a window covering of claim 5, wherein: the inner side of the end cover (2) is provided with a mandrel (2-1), the belt pulley (5) is axially and rotatably arranged on the mandrel (2-1), one side of the belt pulley (5) far away from the end cover (2) is fixedly connected with a sun gear (5-3), an inner gear ring (1-1) is arranged in the shell (1), a planet gear (7) arranged on a planet carrier (6) is arranged in the inner gear ring (1-1), and the planet gear (7) is respectively meshed with the sun gear (5-3) and the inner gear ring (1-1) to form a planet speed reducing mechanism; a sleeve part (1-3) coaxial with the inner gear ring (1-1) is arranged at one end of the shell (1) far away from the end cover (2), the shaft core member (3) is axially and rotatably arranged in the sleeve part (1-3), a shaft core arc flange (3-2) is arranged at one end of the shaft core member (3) close to the planet carrier (6), an input end arc flange (6-2) is arranged at one side of the planet carrier (6) close to the shaft core member (3), the input end arc flange (6-2) is in staggered butt joint with the shaft core arc flange (3-2), a gap is formed at the matching part of the input end arc flange (6-2) and the two sides of the shaft core arc flange (3-2), and a torsion spring (8) is sleeved at the outer side of the input end arc flange (6-2) and the shaft core arc flange (3-2), and two ends of the torsion spring (8) are provided with torsion spring hooks (8-1) which are inwards inserted into the notches and embrace the arc-shaped flanges (6-2) of the input ends, and the outer side of the torsion spring (8) is tightly expanded on the inner side wall of the sleeve part (1-3) to form a torsion spring self-locking mechanism.

7. The silent window covering head for a lifting window covering of claim 6, wherein: the reduction ratio of the planetary reduction mechanism is 1: 4-1: 6.

8. The silent window covering head of claim 7, wherein: a supporting shaft (6-1) is coaxially arranged on one side, close to the shaft core member (3), of the planet carrier (6), and the end part of the supporting shaft (6-1) is inserted into a shaft hole in the shaft core member (3).

9. The silent window covering head of claim 8, wherein: the drawstring wheel (5) is arranged on a mandrel (2-1) of the end cover (2) through a drawstring wheel bearing (9), and the shaft core member (3) is arranged in a sleeve part (1-3) of the shell (1) through a shaft core bearing (10).

10. A silent window covering head for a lifting window covering as claimed in claim 9, wherein: the front end of the shaft core member (3) is provided with a connecting end (3-1) extending out of the sleeve part (1-3); the inner side wall of the shell (1) is also provided with a stop block (1-2) positioned at the upper part of the strap wheel (5).

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