阅读说明：本技术 一种窗帘轨道 (Curtain rail ) 是由 孙勇 俞锡鹏 鲍永林 翁建君 于 2020-08-18 设计创作，主要内容包括：本发明公开了一种窗帘轨道,包括外轨、能相对外轨滑动的内轨和同步带,所述外轨和内轨分别具有在长度方向上相对的第一端和第二端,所述外轨的第一端相邻处设置有主传动轮,所述内轨的第一端插入在外轨内,所述内轨的第二端相邻处设置有副传动轮,其特征在于：所述窗帘轨道还包括伸缩组件,所述伸缩组件包括设置在内轨内的能沿着内轨的长度方向移动的移动轮,所述移动轮能够与内轨锁紧或松开,所述副传动轮包括第一副传动轮和第二副传动轮,所述同步带依次绕设在主传动轮、第一副传动轮、移动轮和第二副传动轮的外周形成环路。(The invention discloses a curtain rail, which comprises an outer rail, an inner rail and a synchronous belt, wherein the inner rail can slide relative to the outer rail, the outer rail and the inner rail are respectively provided with a first end and a second end which are opposite in the length direction, a main driving wheel is arranged adjacent to the first end of the outer rail, the first end of the inner rail is inserted into the outer rail, and an auxiliary driving wheel is arranged adjacent to the second end of the inner rail, and the curtain rail is characterized in that: the curtain track still includes flexible subassembly, flexible subassembly is including setting up the removal wheel that can remove along the length direction of inner rail in the inner rail, it can lock or loosen with the inner rail to remove the wheel, the accessory drive wheel includes first accessory drive wheel and second accessory drive wheel, the hold-in range forms the loop around establishing at main drive wheel, first accessory drive wheel, the periphery that removes wheel and second accessory drive wheel in proper order.)

1. The utility model provides a curtain track, includes outer rail (1), gliding inner rail (2) of outer rail (1) relatively and hold-in range (3), outer rail (1) and inner rail (2) have respectively and hold in length direction relative first end and second, the adjacent department of first end of outer rail (1) is provided with final drive wheel (61), the first end of inner rail (2) inserts in outer rail (1), the adjacent department of second end of inner rail (2) is provided with accessory drive wheel, its characterized in that: the (window) curtain track still includes flexible subassembly, flexible subassembly is including setting up removal wheel (71) that can remove along the length direction of inner rail (2) in inner rail (2), removal wheel (71) can be locked or loosen with inner rail (2), the accessory drive wheel includes first accessory drive wheel (62) and second accessory drive wheel (63), hold-in range (3) are around establishing in proper order at main drive wheel (61), first accessory drive wheel (62), remove periphery formation loop of wheel (71) and second accessory drive wheel (63).

2. The window covering track of claim 1, wherein: the telescopic assembly further comprises a tightness adjusting device, and the movable wheel (71) and the inner rail (2) are locked or loosened by the tightness adjusting device.

3. The window covering track of claim 2, wherein: the telescopic component further comprises a traction belt (73), one end of the traction belt (73) is fixed with the moving wheel (71), the traction belt extends to the second end of the outer rail (1) from the first end of the inner rail (2) to the space between the top of the inner rail (2) and the top of the outer rail (1) in an outward winding mode, and the other end of the traction belt (73) is fixedly connected with the second end of the outer rail (1).

4. The window covering track of claim 3, wherein: the telescopic assembly further comprises a guide member (72), and the guide member (72) is respectively fixed with the traction belt (73) and the moving wheel (71).

5. The window covering track of claim 4, wherein: the inner rail (2) is internally provided with a guide through groove (26) extending along the length direction of the inner rail (2), the guide piece (72) comprises a sliding part (721) positioned above the guide through groove (26) and an insertion part (722) extending downwards from the bottom surface of the sliding part (721), and the insertion part (722) penetrates through the guide through groove (26) and is inserted into the moving wheel (71) to be fixed with the moving wheel (71).

6. The window covering track of claim 5, wherein: the outer rail (1) comprises a hollow first rail main body (11), two side walls of the first rail main body (11) are respectively bent inwards at positions close to the top and extend oppositely to form first extending parts (16), a first connecting wall (17) is arranged between the top of the first rail main body (11) and the positions, close to the outer sides, of the first extending parts (16), and the first extending parts (16), the top of the first rail main body (11) and the first connecting wall (17) form a guide groove (15); interior rail (2) are including hollow second track main part (21), two lateral walls of second track main part (21) are inwards buckled respectively and are extended in opposite directions and form second extension (25) near the position at top, the top of second track main part (21) is connected the top that sets up at second extension (25) through second connecting wall (27), interior rail (2) top both sides insert in guide way (15) of outer rail (1), constitute between the one side that two second extensions (25) are close to each other guide through groove (26).

7. The window covering track of claim 6, wherein: the tightness adjusting device is a bolt (74), the top of the moving wheel (71) is downwards sunken to form a moving wheel groove (711), an inserting part (722) of the guide piece (71) is inserted into the moving wheel groove (711), and the bolt (74) penetrates into the moving wheel groove (711) from the lower direction of the moving wheel groove (711) to connect the moving wheel (71) with the guide piece (72), so that the sliding parts (721) of the moving wheel (71) and the guide piece (72) can clamp the second extending part (25) of the inner rail (2), and the moving wheel (71) and the inner rail (2) are locked.

8. The window covering track of claim 6, wherein: a first partition plate (28) is arranged in a second track main body (21) of the inner rail (2), the first partition plate (28) is arranged below the second extending portion (25), the first partition plate (28) and the second extending portion (25) jointly enclose a structure with a hollow cavity, the synchronous belt (3) extends from the main driving wheel (61) to the first auxiliary driving wheel (62) and from the second auxiliary driving wheel (63) to the main driving wheel (61) and is located in a built-in space of the outer rail (1) or a space between the first partition plate (28) of the inner rail (2) and the side wall of the inner rail (2), the synchronous belt (3) extends from the first auxiliary driving wheel (62) to the moving wheel (71) and from the moving wheel (71) to the second auxiliary driving wheel (63) and is located in a space inside the first partition plate (28) of the inner rail (2), and an operation opening (29) for the outside to contact with the bolt (74) is formed in the bottom of the partition plate (28) of the inner rail (2), the operation opening (29) extends along the length direction of the inner rail (2).

9. The window covering track of claim 6, wherein: a second partition plate (51) is provided on the rear side of the first sub-transmission wheel (62) so as to partially separate the timing belt (3) wound around the first sub-transmission wheel (62) and the second sub-transmission wheel (63).

10. The window covering track of claim 6, wherein: a first opening (12) is formed in the bottom surface of the first track main body (11), and first supporting strips (13) are arranged in the first track main body (11) and positioned on two sides of the first opening (12) in the width direction; a second opening (22) is formed in the bottom surface of the second rail main body (21), and second support bars (23) are arranged in the second rail main body (21) and positioned on two sides of the second opening (22) in the width direction; the curtain also comprises a hanging wheel (100) capable of penetrating through the first opening (12) and the second opening (22), the hanging wheel (100) comprises a supporting portion (103) capable of supporting to move on the first supporting bar (13) and/or the second supporting bar (23), the hanging wheel (100) comprises a connecting portion (101) which penetrates upwards from the first opening (12) of the outer rail (1) to the inside of the outer rail (1), a wheel body (102) is arranged at the top of the connecting portion (101), the wheel body (102) extends in the width direction of the curtain track, and the supporting portion (103) is formed by downward protrusion of the bottom surfaces of the wheel body (102) on two sides of the connecting portion (101).

Technical Field

The invention relates to a curtain rail, in particular to a curtain rail.

Background

Along with the continuous improvement of the technological level, more and more intelligent home furnishings appear in the life of people and are loved by most modern people, and the electric curtain is taken as one of the representatives of the intelligent home furnishing, so that the life of people is facilitated.

The electric curtain realizes the opening and closing of the curtain in an electric control mode, a user can operate the opening and closing of the curtain through wired or wireless control, the electric curtain is very convenient and intelligent to use, the appearance of the electric curtain is basically not different from that of a common curtain, and the electric curtain has the functions of shading and blocking the sun.

The existing electric curtain generally adopts a driving box to drive a transmission belt in a track, so as to drive a suspension arm and a suspension wheel to slide in the track, and realize the opening and closing of the curtain.

Most curtains approach to each other at two sides simultaneously to realize closing, are symmetrical and attractive, have small running distance, and are arranged at two opposite positions on a belt ring in a track according to the principle of realizing moving tracks with the same speed and opposite directions. The utility model discloses an do not receive length restriction and but on-the-spot equipment's electronic remote control curtain track that opens and shuts of chinese patent application No. 201310549457.3, be equipped with the track groove in the track shell, the cutting can insert track inslot sliding fit, be equipped with the race of tooth in the cutting and get the electric steel band groove, the race of tooth can insert the race of tooth respectively with getting the electric steel band and get electric steel band inslot sliding fit, be equipped with in track shell both ends head and get the spacing briquetting assembly of electricity, be equipped with the spacing briquetting assembly of intermediate power supply in the middle of the track shell, install the walking motor in the track shell, install the gear on the walking motor, gear and race meshing transmission, install flexible electricity probe of getting on the walking motor, the walking motor.

Because the size of the window of each family is all different basically, current (window) curtain track need carry out the customization according to the size of different windows and make, and is very inconvenient. Therefore, a telescopic curtain rail is available, for example, a telescopic rail and a hanging wheel of a curtain disclosed in chinese patent No. 201420249690.X, the hanging wheel includes a wheel seat and two pulleys connected to both sides thereof, the telescopic rail includes an outer rail and an inner rail, longitudinal sections of the outer rail and the inner rail are both in the shape of a groove with a downward notch, and the inner rail is movably inserted into the outer rail; the groove opening of the outer rail is relatively provided with two right-angle bent strips bent at right angles, the groove opening of the inner rail is relatively provided with two double-bent strips bent at two times, the two double-bent strips are correspondingly matched with the two right-angle bent strips respectively, the heights of the two double-bent strips are equal, and the upper transverse edges A of the two double-bent strips are aligned with the upper transverse edges B of the two right-angle bent strips respectively.

When the telescopic rail is used, but the whole length of the rail needs to be changed, the inner rail is only pulled out from the inner part of the outer rail and cannot provide the support of limiting and resetting, so that the state of the rail is unstable in the using process and the use is inconvenient.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a curtain rail which can be conveniently adapted to windows with different sizes, and improve the stability and convenience of operation and use, aiming at the defects of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a curtain track, includes outer rail, can be relative outer rail gliding inner rail and hold-in range, outer rail and inner rail have respectively and hold at length direction relative first end and second, the adjacent department of first end of outer rail is provided with the final drive wheel, the first end of inner rail inserts in the outer rail, the adjacent department of second end of inner rail is provided with auxiliary drive wheel, its characterized in that: the curtain track still includes flexible subassembly, flexible subassembly is including setting up the removal wheel that can remove along the length direction of inner rail in the inner rail, it can lock or loosen with the inner rail to remove the wheel, the accessory drive wheel includes first accessory drive wheel and second accessory drive wheel, the hold-in range forms the loop around establishing at main drive wheel, first accessory drive wheel, the periphery that removes wheel and second accessory drive wheel in proper order.

In order to lock or release the movable wheel and the inner rail conveniently, the telescopic assembly further comprises a tightness adjusting device, and the tightness adjusting device locks or releases the movable wheel and the inner rail.

The retraction assembly further includes a traction band secured at one end to the movable wheel and extending outwardly from the first end of the inner rail to a space between the top of the inner rail and the top of the outer rail and toward the second end of the outer rail, the other end of the traction band being secured to the second end of the outer rail.

In order to limit the moving track of the moving wheel, the telescopic assembly further comprises a guide piece which is respectively fixed with the traction belt and the moving wheel.

In order to facilitate the connection of the guide piece with the traction belt and the moving wheel, a guide through groove extending along the length direction of the inner rail is formed in the inner rail, the guide piece comprises a sliding part positioned above the guide through groove and an insertion part extending downwards from the bottom surface of the sliding part, and the insertion part penetrates through the guide through groove to be inserted into the moving wheel to be fixed with the moving wheel.

In order to enable the inner rail to slide on a limited path relative to the outer rail, the outer rail comprises a hollow first rail main body, two side walls of the first rail main body are respectively bent inwards at positions close to the top and extend oppositely to form first extending parts, a first connecting wall is arranged between the top of the first rail main body and the positions of the first extending parts close to the outer sides, and the first extending parts, the top of the first rail main body and the first connecting wall form a guide groove; the inner rail comprises a hollow second rail main body, two side walls of the second rail main body are respectively bent inwards at positions close to the top to extend oppositely to form second extending portions, the top of the second rail main body is connected and arranged above the second extending portions through second connecting walls, two sides of the top of the inner rail are inserted into guide grooves of the outer rail, and one side, close to each other, of the two second extending portions forms the guide through groove.

Preferably, the tightness adjusting device is a bolt, the top of the moving wheel is recessed downwards to form a moving wheel groove, the insertion part of the guide piece is inserted into the moving wheel groove, and the bolt penetrates into the moving wheel groove from the lower direction of the moving wheel groove to connect the moving wheel and the guide piece, so that the sliding parts of the moving wheel and the guide piece can clamp the second extending part of the inner rail, and the locking of the moving wheel and the inner rail is realized.

For avoiding touching between the hold-in range, be provided with first baffle in the second track main part of inner rail, first baffle sets up the below at the second extension to first baffle and second extension enclose into the structure that has the cavity jointly, the hold-in range is located the built-in space of outer rail or the space between the first baffle of inner rail and the inner rail lateral wall when extending from main drive wheel to first auxiliary transmission wheel, from second auxiliary transmission wheel to main transmission wheel, the hold-in range is located the inside cavity of first baffle of inner rail when extending from first auxiliary transmission wheel to removing the wheel, from removing the wheel to the second auxiliary transmission wheel.

In order to avoid the contact between the synchronous belts, a second partition plate is arranged at the rear side of the first secondary transmission wheel, so that the synchronous belts wound on the first secondary transmission wheel and the second secondary transmission wheel are spaced apart.

In order to enable the hanging wheel to stably slide, a first opening is formed in the bottom surface of the first rail main body, and first supporting strips are arranged in the first rail main body and positioned on two sides of the first opening in the width direction; a second opening is formed in the bottom surface of the second rail main body, and second support bars are arranged in the second rail main body and positioned on two sides of the second opening in the width direction; the (window) curtain is still including passing first opening and second open-ended hanging wheel, hanging wheel is including supporting the supporting part that removes on first supporting strip and/or second supporting strip, hanging wheel includes upwards penetrates the inside connecting portion of outer rail from the first opening of outer rail, the top of connecting portion is provided with the wheel body, the wheel body extends on the orbital width direction of (window) curtain, the supporting part is located the bottom surface downwardly protruding and formation of connecting portion both sides by the wheel body.

Compared with the prior art, the invention has the advantages that: through set up the removal wheel that can remove along the length direction of inner rail in the inner rail, two auxiliary drive wheels of rail tip in the cooperation for the hold-in range is around establishing the removal wheel, thereby can make inner rail and outer rail keep suitable rate of tension at flexible in-process hold-in range, and owing to remove the wheel and can lock with the inner rail and loosen, make outer rail and inner rail inject in arbitrary flexible position, convenient operation, the track is stable. Furthermore, because the movable wheel can be adjusted at any position on the inner rail, when the synchronous belt is installed in the rail, the length of the required synchronous belt is not required to be accurately measured and cut, and the position of the movable wheel on the inner rail only needs to be finely adjusted, so that the movable wheel is convenient and practical.

Drawings

FIG. 1 is a schematic view of a track according to an embodiment of the present invention in a contracted state;

FIG. 2 is a width-wise cross-sectional view of FIG. 1;

FIG. 3 is a width-wise cross-sectional view of FIG. 1 (different in location from the cross-section of FIG. 2);

FIG. 4 is a longitudinal transverse cross-sectional view of FIG. 1;

FIG. 5 is a longitudinal sectional view in the length direction of FIG. 1;

FIG. 6 is an exploded view of a track according to an embodiment of the present invention;

FIG. 7 is a schematic outer rail of a track according to an embodiment of the present invention;

FIG. 8 is a schematic illustration of an inner rail of a track according to an embodiment of the present invention;

FIG. 9 is an enlarged view of a portion I of FIG. 5;

FIG. 10 is an enlarged view of portion II of FIG. 5;

FIG. 11 is a schematic view of an extended state of a track according to an embodiment of the present invention;

FIG. 12 is a cross-sectional view of FIG. 11;

FIG. 13 is an enlarged view of a portion III of FIG. 12;

fig. 14 is an enlarged view of a portion iv of fig. 12.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 and 6, a window curtain rail includes an outer rail 1, an inner rail 2, and a timing belt 3, wherein the inner rail 2 is at least partially disposed inside the outer rail 1, and the inner rail 2 is slidable relative to the outer rail 1 along a length direction of the outer rail 1.

Referring to fig. 2 to 6, the outer rail 1 has a first end and a second end opposite to each other in a length direction, the inner rail 2 has a first end and a second end opposite to each other in a length direction, and both the outer rail 1 and the inner rail 2 have a long shape. Adjacent department with the first end of outer rail 1 is provided with first casing 4, and the first end of inner rail 2 is located outer rail 1, and the second end of inner rail 2 is located outer rail 2's second end outside, is provided with second casing 5 with the adjacent department of inner rail 2's second end. A main driving wheel 61 is arranged in the first shell 4, a first auxiliary driving wheel 62 and a second auxiliary driving wheel 63 are arranged in the second shell 5, the first shell 4 can be arranged in a split mode or an integrated mode with the outer rail 1, and the second shell 5 can be arranged in a split mode or an integrated mode with the inner rail 2. The main transmission wheel 61 can be connected to an external driving source, such as an output end of a motor, to transmit power of the driving source. Alternatively, the main transmission wheel 61 may be manually driven. The first sub-transmission wheel 62 and the second sub-transmission wheel 63 are juxtaposed in the width direction of the inner rail 2 (or the outer rail 1). In fig. 4, the first sub-transmission wheel 62 is located in front of the second sub-transmission wheel 63, and the front side is the side close to the user (right side) and the rear side is the side close to the wall (left side). In the rail use state, the rotational axis of each drive wheel extends in the longitudinal direction, preferably in the vertical direction.

Referring to fig. 7, the outer rail 1 includes a hollow first rail main body 11, a first opening 12 is opened on a bottom surface of the first rail main body 11, a first supporting strip 13 and a first limiting strip 14 are disposed in the first rail main body 11 and at positions on two sides of the first opening 12 in the width direction, the first supporting strip 13 and the first limiting strip 14 both extend along the length direction of the first rail main body 11, the first limiting strip 14 is closer to the first opening 12 than the first supporting strip 13, and a top end of the first limiting strip 14 is higher than a top end of the first supporting strip 13. Guide grooves 15 are formed on both sides of the first rail body 11 in the width direction near the top, and the guide grooves 15 are formed to be outwardly recessed. In this embodiment, two side walls (side walls opposite to each other in the width direction) of the first rail main body 11 are respectively bent inward at the top portion and extended toward each other to form a first extending portion 16, a first connecting wall 17 is provided between the top portion of the first rail main body 11 and the position of the first extending portion 16 near the outer side, and the first extending portion 16, the top portion of the first rail main body 11, and the first connecting wall 17 constitute the guide groove 15.

Referring to fig. 8, the inner rail 2 includes a hollow second rail main body 21, a second opening 22 has been seted up on the bottom surface of the second rail main body 21, a second support bar 23 and a first limit bar 24 are provided in the second rail main body 21 and at positions located on both sides of the width direction of the second opening 22, the second support bar 23 and the second limit bar 24 all extend along the length direction of the second rail main body 21, the second limit bar 24 is more far away from the second opening 12 relative to the second support bar 23, and the top end of the second limit bar 24 is higher than the top end of the second support bar 23. Two side walls (side walls opposite to each other in the width direction) of the second rail main body 21 are respectively bent inward at the top to extend and form second extending portions 25, and a gap is formed between the sides of the two second extending portions 25 close to each other to form a guiding through groove 26, that is, the two second extending portions 25 do not contact each other. The top of the second rail main body 21 is connected to and disposed above the second extension 25 by a second connecting wall 27. The top of the second rail main body 21 and the second extension 25 are spaced apart. A first partition plate 28 is arranged in the second rail main body 21, the first partition plate 28 is arranged below the second extension portion 25, and the first partition plate 28 and the second extension portion 25 together enclose a structure with a hollow cavity. I.e., the first partition 28 is generally "U" shaped.

The inner rail 2 is inserted into the outer rail 1, and both sides of the top of the inner rail 2 are inserted into the guide grooves 15 of the outer rail 1, defining the relative position of the inner rail 2 with respect to the outer rail 1 in the front-rear direction and the up-down direction, preventing the inner rail 2 from relatively moving with respect to the outer rail 1 in these two directions. And the guide groove 15 plays a role of guiding the sliding of the inner rail 2. The top of the outer rail 1 is provided with a mounting bracket 18 for mounting and fixing the curtain rail and an external mounting base such as a ceiling. Similarly, the top of the inner rail 2 is also provided with a mounting bracket 18. In the mounted state of the outer rail 1 and the inner rail 2, the first supporting strip 13 of the outer rail 1 and the second supporting strip 23 of the inner rail 2 are flush.

Referring to fig. 2-5, 9 and 10, to facilitate telescopic positioning of the inner rail 2 relative to the outer rail 1, the window covering track further comprises a telescopic assembly comprising a moving wheel 71 disposed within the inner rail 2, a guide member 72 and a traction belt 73. The moving wheel 71 is slidable along the length of the inner rail 2, and the guide 72 is also slidable along the length of the inner rail 2 along with the moving wheel 71 within the inner rail 2. The axial directions of the main transmission wheel 71, the first sub-transmission wheel 62, the second sub-transmission wheel 63 and the moving wheel 71 are parallel to each other.

The moving wheel 71 is slidably supported at the bottom of the first partition 28, and the top of the moving wheel 71 is recessed downward to form a moving wheel groove 711. The guide 72 includes a sliding portion 721 and an insertion portion 722, the sliding portion 721 is located between the top of the second rail main body 21 and the second extending portion 25, the insertion portion 722 extends downward from the bottom surface of the sliding portion 721, passes through the guide through groove 26 between the two second extending portions 25, and is inserted into the moving wheel groove 711 of the moving wheel 71, the insertion portion 722 and the moving wheel 71 can be fixed by the bolt 74 so as to be capable of moving synchronously, the guide through groove 26 can guide the movement of the guide 72, and the moving wheel 71 can move along a predetermined path in the inner rail 2 by the cooperation of the guide 72 and the guide through groove 26.

The bolt 74 serves as a slack adjuster to lock or unlock the moving wheel 71 to or from the inner rail 2. The bolt 74 is inserted into the moving wheel groove 711 from below the moving wheel groove 711, and the moving wheel 71 and the guide 72 can be coupled to each other, so that when the bolt 74 is tightened, the sliding portions 721 of the moving wheel 71 and the guide 72 clamp the second extending portion 25 of the inner rail 2, and the moving wheel 71 and the inner rail 2 are locked to each other, and at this time, the moving wheel 71 cannot move relative to the inner rail 2. When the bolt 74 is unscrewed, i.e. the moving wheel 71 and the sliding part 721 no longer grip the second extension 25 of the inner rail 2, the moving wheel 71 may move relative to the inner rail 2. Alternatively, the slack adjuster can be implemented with other removable fasteners that connect the movable wheel 71 to the guide 72; alternatively, the slack adjuster can be other removable fasteners that directly connect the moving wheel 71 to the inner rail 2. The bottom of the partition plate 28 of the inner rail 2 of the guide 72 is opened with an operation opening 29 for the outside to contact with the bolt 74, and the operation opening 29 extends along the length direction of the inner rail 2.

The traction belt 73 has opposite first and second ends, the first end of the traction belt 73 is fixedly coupled with the sliding portion 721 of the guide member 72, the traction belt 73 extends from the first end toward the first end of the inner rail 2 along a space between the top of the second rail body 21 of the inner rail 2 and the second extension portion 25, and is bent upward at the first end of the inner rail 2 to enter a space between the top of the inner rail 2 and the top of the outer rail 1 from outside the first end of the inner rail 2 and extend toward the second end of the outer rail 1 in the space, and the second end of the traction belt 73 is fixedly coupled with the second end of the outer rail 1. Preferably, the curved contact surface between the end of the first end of the second rail body 21 of the inner rail 2 (the first end of the inner rail 2) and the pull belt 73 is a smooth curved surface 211, so that the pull belt 73 can smoothly slide along the first end of the inner rail 2 when the rail is extended or retracted, thereby preventing the pull belt 73 from being scratched. Further, the second end of the traction belt 73 can be inserted into the slot 111 at the second end of the first rail body 11 of the outer rail 1 (the second end of the outer rail 2) to the top of the outer rail 1, and then pressed against the top surface of the outer rail 1 by the end of the fixing bolt on the mounting bracket 18. The sliding portion 721 may be formed with a coupling groove 723, and the first end of the traction belt 73 is inserted into the coupling groove 723 and fixed. The traction belt 73 may be a strip belt, a rope or other flexible attachment. Preferably, the traction belt 73 is inelastic and cannot be stretched in the longitudinal direction.

Preferably, the curved contact surface between the end of the first end of the second rail body 21 of the inner rail 2 (the first end of the inner rail 2) and the pull belt 73 is a smooth curved surface 211, so that the pull belt 73 can smoothly slide along the first end of the inner rail 2 when the rail is extended or retracted, thereby preventing the pull belt 73 from being scratched. Further, the second end of the traction belt 73 can be inserted into the slot 111 at the second end of the first rail body 11 of the outer rail 1 (the second end of the outer rail 2) to the top of the outer rail 1, and then pressed against the top surface of the outer rail 1 by the end of the fixing bolt 181 on the mounting bracket 18.

The timing belt 3 extends from the outer periphery of the main transmission wheel 61 to the outer periphery of the first sub transmission wheel 62 along the space between the first partition 28 of the inner rail 2 and the side wall of the inner rail 2, returns from the outer periphery of the first sub transmission wheel 62 to the moving wheel 71, enters from the second end of the inner rail 2 into the cavity inside the first partition 28 of the inner rail 2, extends to the moving wheel 71, returns from the outer periphery of the moving wheel 71 to the direction of the second sub transmission wheel 63, extends along the cavity inside the first partition 28 of the inner rail 2 to the second sub transmission wheel 63, returns from the outer periphery of the second sub transmission wheel 63 to the main transmission wheel 61, enters from the second end of the inner rail 2 into the built-in space of the outer rail 1 (when the outer rail 1 and the inner rail 2 are in a stretched state, the outer rail 1 and the inner rail 2 do not overlap, or when the inner rail 2 does not have the first partition 28) or the space between the first partition 28 of the inner rail 2 and the side wall of the inner rail 2 extends to the main transmission wheel 61, thereby constituting a loop. Preferably, in order to facilitate smooth circulation of the timing belt 3, a path of the timing belt 3 from the main transmission wheel 61 to the first sub transmission wheel 62 is located on a front side in the inner rail 2, a path of the timing belt 3 from the second sub transmission wheel 63 to the main transmission wheel 61 is located on a rear side in the inner rail 2, the timing belt 3 is wound around an outer circumference of the first sub transmission wheel 62 from the front side of the first sub transmission wheel 62 to the first sub transmission wheel 62 from the main transmission wheel 61 to the first sub transmission wheel 62, the timing belt 3 is wound around an outer circumference of the moving wheel 71 from the front side of the moving wheel 71 to the moving wheel 71 from the first sub transmission wheel 62 to the moving wheel 71, and the timing belt 3 is wound around an outer circumference of the second sub transmission wheel 63 from the front side of the second sub transmission wheel 63 to the. Thus, the portion of the timing belt 3 wound between the main transmission wheel 61 and each sub transmission wheel forms an outer layer, and the portion of the timing belt 3 wound between the moving wheel 71 and each sub transmission wheel forms an inner layer.

The synchronous belt 3 sequentially winds the peripheries of the main transmission wheel 61, the first auxiliary transmission wheel 62, the moving wheel 71 and the second auxiliary transmission wheel 63, and the synchronous belt 3, the main transmission wheel 61 and the two auxiliary transmission wheels are in tooth meshing transmission, so that the synchronous belt can circularly move on the peripheries of the main transmission wheel 61, the first auxiliary transmission wheel 62, the moving wheel 71 and the second auxiliary transmission wheel 63 under the driving of the main transmission wheel 61. In order to prevent the timing belts 3 from being touched, a second partition plate 51 may be disposed at a rear side of the first secondary driving wheel 62 in the second housing 5 to separate the timing belts 3 wound around the first secondary driving wheel 62 and the second secondary driving wheel 63, and the first partition plate 28 of the inner rail 2 also serves to separate the timing belts 3 wound to and from each other. Of course, when the track is wide enough, the distance between the timing belt 3 and the first partition 28 and the second partition 51 is enough when the timing belt is wound in each direction, and the external tool can pass through the openings of the outer rail 1 and the inner rail 2 and directly operate the bolt 74.

In the initial state, referring to fig. 1, 4 and 5, the inner rail 2 is fully retracted within the outer rail 1, and at this time, the moving wheel 71 is located within the inner rail 2 near the first end thereof, the traction belt 73 is in a substantially natural state, and the bolt 74 is in a tightened state, i.e., the moving wheel 71 and the inner rail 2 are locked. When it is desired to extend the curtain rail, first, a tool is sequentially passed through the first opening 12 of the outer rail 1, the second opening 22 of the inner rail 2 and the operation opening 29, the bolt 74 is loosened to loosen the moving wheel 71 and the inner rail 2, and then the inner rail 2 is pulled out from the outer rail 1, see fig. 11 to 14, thereby moving the second housing 5 in a direction away from the first housing 4, i.e., moving the two sub-transmission wheels away from the driving wheel, thereby extending the outer layer of the timing belt 3, contracting the inner layer of the timing belt 3, and under the action of the timing belt 3, the moving wheel 71 is moved in a direction toward the second end of the inner rail 2 (the direction of the two sub-transmission wheels) to elongate the portion of the traction belt 73 located in the inner rail 2 (only the portion located in the inner rail 2 is increased in length without deformation), while the portion of the traction belt 73 located between the outer rail 1 and the inner rail 2 is shortened, and when the inner rail 2 is stretched in place, the bolt 74 is retightened so that the moving wheel 71 is locked with the inner rail 2 to be maintained at the current position without being moved during use.

When the inner rail 2 is required to be contracted again, the bolt 74 is loosened again, and then the inner rail 2 is pushed in toward the first end of the outer rail 1, so that the second housing 5 is moved toward the first housing 4, that is, the two secondary transmission wheels are brought close to the main transmission wheel, so that the portions of the timing belt 3 between the main transmission wheel 61 and the first secondary transmission wheel 62 and between the main transmission wheel 61 and the second secondary transmission wheel 63 are contracted, and the portion of the traction belt 73 between the inner rail 2 and the outer rail 1 is extended due to the inner rail 2 being pushed in toward the outer rail 1, so that the traction belt 73 is shortened in the inner rail 2, and the traction belt 73 moves the moving wheel 71 toward the second end of the inner rail 2 (the direction of the two secondary transmission wheels), so that the moving wheel 71 pushes the portion of the timing belt 3 wound thereon toward the first end of the inner rail 2, and when the outer layer and the inner layer of the timing belt 3 are completely parallel, the distance traveled by the inner rail 2, The shrinkage of the outer layer of the synchronous belt 3 along the length direction of the track, the stretching of the synchronous belt 3 along the length direction of the track, the moving distance of the moving wheel 71 and the elongation of the traction belt 73 between the inner rail 1 and the inner rail 2 along the length direction of the track (the shortening of the traction belt 73 in the inner rail 2) are basically equal, so that the moving wheel 71 automatically moves to a proper position matched with the synchronous belt 3 without manual adjustment, and when the inner rail 2 is shrunk to the right position, the bolt 74 is screwed again. Even if the hold-in range 3 is in the state that is not parallel completely, the shrinkage of hold-in range 3 at the skin is less than the tensile volume of inlayer, and the power that hold-in range 3 was exerted on removing the wheel 71 increases, because the effort between hold-in range 3 and the removal wheel 71 ensures can both make hold-in range 3 normally remove in certain extent, in addition hold-in range 3 has certain elasticity, consequently, orbital normal operating still can be ensured around establishing the mode to hold-in range 3 this kind. Even if the force between the timing belt 3 and each secondary transmission wheel exceeds the limit or the user thinks that the force is excessive, the position of the moving wheel 71 can be manually adjusted.

In addition, when the outer rail 1 and the inner rail 2 are stretched or contracted, even if the timing belt 3 slips and slips too loosely between the main and auxiliary transmission wheels and the moving wheel, the position of the moving wheel 71 can be manually adjusted.

The curtain rail further comprises hanging wheels 100 and pulleys 200, the hanging wheels 100 are used for being connected with curtain cloth (not shown), the pulleys 200 are connected with the synchronous belts 3 and the curtain cloth, when the curtain is an opening and closing curtain, the pulleys 200 are provided with two pulleys, two ends of the synchronous belts 3 (the synchronous belts 3 are in a strip shape during installation) are respectively connected with one pulley 200, so that a closed loop is formed, the pulleys 200 are connected with one curtain cloth, and the connection mode can facilitate installation and adjustment of the tightness degree of the synchronous belts 3 during installation. The synchronous belt 3 passes through another pulley 200 and is connected and fixed, and the pulley 200 is connected with another curtain cloth. When the curtain is a unidirectional curtain, only one pulley 200 is connected with two ends of the synchronous belt 3. The hanging wheel 100 comprises a connecting portion 101 penetrating upwards from the first opening 12 of the outer rail 1 to the inside of the outer rail 1, a wheel body 102 is arranged at the top of the connecting portion 101, the wheel body 102 extends in the width direction of the curtain rail, supporting portions 103 protruding downwards are respectively arranged on the bottom surfaces of the positions of the wheel body 102 at the two sides of the connecting portion 101, and the supporting portions 103 can be matched with the first supporting strips 13 and the first limiting strips 14 of the outer rail 1 and the second supporting strips 23 and the second limiting strips 24 of the inner rail 2 to move along the first supporting strips 13 and/or the second supporting strips 23. The bottom of the connection part 101 is provided with a mounting part 104, and the mounting part 104 is positioned below the curtain rail, and a hook 105 may be provided thereon to be connected with the curtain cloth.

In the portion of only the outer rail 1, the support portion 103 of the hanging wheel 100 is supported by the first support bar 13 to move, and the position is limited by the first limit bar 14, so that the front and rear shaking is avoided. At the position where the outer rail 1 and the inner rail 2 are connected, the supporting part 103 of the hanging wheel 100 is supported on the supporting surface formed by matching the first supporting bar 13 and the second supporting bar 23 to move, and the position is limited by the first limiting bar 14 and the second limiting bar 24, so that the front and back shaking is avoided. In the portion where only the inner rail 2 is provided, the supporting portion 103 of the hanging wheel 100 is supported on the second supporting bar 23 to move, and the position is defined by the second stopper bar 24, preventing the fore-and-aft movement.