Patent Description:
Curtain is a household product installed at the window to play a role of shading. At present, various rooms have window walls with different widths. Therefore, the width of the window wall needs to be measured before the curtain guide rail is made, and then the corresponding curtain guide rail is made according to the measured width. This kind of curtain guide rail needs to be customized one by one, which cannot realize mass industrial production; it also needs on-site measurement, which wastes manpower and material resources; if there are errors in the measurement or manufacturing process, the curtain guide rail may not be used and needs to be reworked. Therefore, the traditional curtain guide rail adopts customization method, which has low efficiency, high cost and weak applicability.

Based on the above problems, more and more people begin to study the telescopic curtain guide rail, that is, the length of the curtain guide rail can be telescopically adjusted, and then one specification of the telescopic curtain guide rail can be applied to multiple sizes of windows. Since the telescopic curtain guide rail is still in its infancy, it needs to be wound with the help of multiple pulleys during the stretching and retracting of the curtain guide rail. The existing winding method leads to the increase of the volume of the curtain guide rail and the limited application occasions, which is not conducive to industrialized mass production.

<CIT> discloses a telescopic electric curtain guide rail according to the preamble of claim <NUM>, including: a first guide rail piece, a second guide rail piece, and an adjustment mechanism; the first guide rail piece is provided with a hollow telescopic accommodating cavity, an end of the first guide rail piece is provided with a first curtain guide rail, the second guide rail piece is sleeved in the telescopic accommodating cavity and movable along a length of the first guide rail piece in the telescopic accommodating cavity, the second guide rail piece is provided with a second curtain guide rail capable of being combined with the first curtain guide rail; the adjustment mechanism can adjust a sleeving length between the first guide rail piece and the second guide rail piece, and the adjustment mechanism includes: an adjustment member, a winding reel, a first rotating member and a second rotating member, the adjustment member is wound on the winding reel, the first rotating member is provided on a side of the first guide rail piece far away from the second guide rail piece, the second rotating member is provided on a side of the second guide rail piece far away from the first guide rail piece; the adjustment member is arranged around the first rotating member and the second rotating member.

In view of the shortcomings of the related art, an objective of the invention is to provide a telescopic curtain guide rail.

In the following, the invention will be further described in combination with the accompanying drawings and specific embodiments:.

As shown in <FIG>, an embodiment of the invention provides a telescopic curtain guide rail including: an inner rail <NUM>, an outer rail <NUM> and a transmission unit. The inner rail <NUM> is connected to a side of the outer rail <NUM>, the inner rail <NUM> is embedded in the outer rail <NUM> and slidable along the outer rail <NUM>. The transmission unit includes a driving wheel <NUM>, a driven wheel <NUM>, a first fixed pulley <NUM>, a second fixed pulley <NUM> and a conveyor belt <NUM>. The driving wheel <NUM> and the driven wheel <NUM> are respectively located at two opposite ends of the telescopic curtain guide rail, the two opposite ends of the telescopic curtain guide rail are the ends where the inner rail and the outer rail are away from each other, that is, the driving wheel and the driven wheel are located at two ends of the inner rail and the outer rail respectively. Specifically, the driving wheel is located at one end of the inner rail or one end of the outer rail. The driving wheel <NUM> is connected to the motor. The first fixed pulley <NUM> and the second fixed pulley <NUM> are respectively located at the other ends of the inner rail and the outer rail, in order to distinguish the first fixed pulley from the second fixed pulley, the invention defines that the driving wheel and the first fixed pulley are located at two ends of the inner rail or the outer rail at the same time, and the driven wheel and the second fixed pulley are located at two ends of the outer rail or the inner rail at the same time. Of course, the first fixed pulley and the second fixed pulley are only to distinguish in naming, when the driving wheel and the second fixed pulley are located at two ends of the inner rail or the outer rail at the same time, it is only necessary to exchange the following first fixed pulley and the second fixed pulley of the invention.

The unique feature of the transmission unit of the invention is that the first fixed pulley <NUM> and the driving wheel <NUM> are fixed at both ends of the outer rail <NUM>, the second fixed pulley <NUM> and the driven wheel <NUM> are fixed at both ends of the inner rail <NUM>, and the winding mode of the conveyor belt <NUM> is the driving wheel <NUM> - the driven wheel <NUM> - the second fixed pulley <NUM> - the first fixed pulley <NUM> - the driving wheel <NUM>, and the first fixed pulley <NUM> and the second fixed pulley <NUM> are located on the same sides of the inner rail <NUM> and the outer rail <NUM>. This winding mode ensures that when the driving wheel <NUM> is close to the driven wheel <NUM>, the first fixed pulley <NUM> is away from the second fixed pulley <NUM>, and ensures that the total length of the conveyor belt <NUM> remains unchanged. The winding mode is simple, and the floor area is small, which reduces the production cost and transportation cost.

As shown in <FIG>, the outer rail <NUM> of the embodiment includes an upper-end first closed groove and a lower-end first opening groove, the inner rail <NUM> includes an upper-end second closed groove and a lower-end second opening groove, the upper-end first closed groove is embedded in the upper-end second closed groove, the lower-end second opening groove is embedded in the lower-end first opening groove. A horizontal cross-sectional area of the lower-end second opening groove is less than that of the lower-end first opening groove, one side wall of the lower-end second opening groove is in contact with one side wall of the lower-end first opening groove, the other side wall of the lower-end second opening groove and the other side wall of the lower-end first opening groove together form a fixed pulley receiving chamber <NUM>. In the above description, the closed groove (the upper-end first closed groove and the upper-end second closed groove) refers to that the groove has the bottom as shown at the upper ends of the inner rail <NUM> and the outer rail <NUM> in <FIG> and <FIG>, the opening groove (the upper-end first opening groove and the upper-end second opening groove) refers to that the groove is a cavity structure and the upper end surface of the cavity structure shares a surface with the bottom of the closed groove as shown at the lower ends of the inner rail <NUM> and the outer rail <NUM> in <FIG> and <FIG>. It can be clearly seen from the attached drawings that the lower end of the outer rail <NUM> is an integral opening groove structure, while the lower end of the inner rail <NUM> includes an opening groove structure and the fixed pulley receiving chamber <NUM>. Only the first fixed pulley is installed in the fixed pulley receiving chamber <NUM>, and the second fixed pulley is just located in the plane on the side shared by the lower-end second opening groove and the fixed pulley receiving chamber <NUM>.

As shown in <FIG>, a bottom of the fixed pulley receiving chamber <NUM> includes a bottom surface of the outer rail <NUM> and a bottom surface of the inner rail <NUM>, and the bottom surface of the inner rail <NUM> is located above the bottom surface of the outer rail <NUM> and coincides with the bottom surface of the outer rail <NUM>. The outer rail <NUM> includes an L-shaped partition plate <NUM>, the L-shaped partition plate <NUM> is located in the fixed pulley receiving chamber and fixedly connected with an inner wall of the lower-end first opening groove, and portions of the conveyor belt located on two sides of the first fixed pulley are respectively located on two sides of the L-shaped partition plate <NUM>. The inner rail <NUM> further includes a first partition plate <NUM>, the first partition plate <NUM> is located in the lower-end second opening groove, and an upper end of the first partition plate <NUM> is fixedly connected to an outside of a bottom of the upper-end second closed groove, segments of the conveyor belt located on both sides of the driven wheel are respectively disposed on both sides of the first partition plate <NUM>.

As shown in <FIG>, an opening of each of the lower-end first opening groove and the lower-end second opening groove includes bends <NUM>, the bends <NUM> of the lower-end first opening groove are matched with the bends <NUM> of the lower-end second opening groove, and upper surfaces of the bends of the lower-end first opening groove and upper surfaces of the bends of the lower-end second opening groove are located at a same horizontal plane. the bend <NUM> can be a right-angle bend or a bend with radian; the bend is set here because the rail trolley of curtain on the belt buckle needs to move between lower-end opening grooves of the inner rail <NUM> and the outer rail <NUM>, in order to ensure the smooth movement of the rail trolley of curtain, clamping plates are usually set inside and outside the lower-end opening grooves respectively, the bend here can ensure the smooth transition of the rail trolley of curtain from the inner rail <NUM> to the outer rail <NUM>, and smooth sliding in the overlapping area of the inner rail <NUM> and the outer rail <NUM>. The groove bottoms of the upper-end first closed groove and the upper-end second closed groove are disposed with protrusions matched each other.

As shown in <FIG>, the first fixed pulley of the embodiment is fixed on the outer rail <NUM> through a first fixed part, the first fixed part covers outsides of the inner rail <NUM> and the outer rail <NUM>, the first fixed part covering the outside of the inner rail <NUM> extends into the fixed pulley receiving chamber <NUM> to fix a central axis of the first fixed pulley, and the first fixed part covering the outside of the outer rail <NUM> is fixed at the outside of the outer rail <NUM> through fixed screws. It is precisely because the first fixed pulley is fixed at the end of the contact between the outer rail <NUM> and the inner rail <NUM>, and the first fixed pulley is located in the fixed pulley receiving chamber <NUM> and needs to be fixed with the outer rail <NUM>, therefore, the application skillfully leads the first fixed pulley out of the fixed pulley receiving chamber <NUM> and fixed at the upper end of the outer rail <NUM> with the help of a special first fixed part structure. Specifically, as described in <FIG>, the first fixed part <NUM> covers the outer side of the outer rail <NUM> and the inner rail <NUM> as a whole, the first fixed part <NUM> covering the outer side of the inner rail <NUM> contains two horizontal fixed plates in the fixed pulley receiving chamber, which respectively fix the upper and lower ends of the central shaft of the first fixed pulley, and the first fixed part covering the top of the outer rail <NUM> is provided with two screw holes, the two fixed screws respectively penetrate through the two screw holes to fix the first fixed part on the upper end of the outer rail <NUM>. To sum up, the first fixed part is just located at the connection between the inner rail <NUM> and the outer rail <NUM> and is fixed on the outer rail <NUM>, while the first fixed part located in the fixed pulley receiving chamber <NUM> is used to fix the central axis of the first fixed pulley.

The central axis of the second fixed pulley is fixed on a side wall of the lower-end second opening groove close to the fixed pulley receiving chamber <NUM> through a second fixed part, and the central axis of the second fixed pulley and the side wall of the lower-end second opening groove close to the fixed pulley receiving chamber <NUM> are located in a same plane. To sum up, the first fixed pulley is located in the fixed pulley receiving chamber <NUM>, and the second fixed pulley is located on the side of the fixed pulley receiving chamber <NUM> close to the lower-end second opening groove, that is, the central axis of the second fixed pulley and the side wall of the lower-end second opening groove close to the fixed pulley receiving chamber <NUM> are located in the same plane. The overall winding mode of the conveyor belt is shown in <FIG>.

In an illustrated embodiment, the conveyor belt is connected with a belt buckle, a lower end of the belt buckle is connected with a rail trolley of curtain (also referred to as curtain slider, curtain mover), and the rail trolley of curtain is connected with a curtain cloth. When the motor drives the driving wheel to rotate, the driving wheel drives the conveyor belt to rotate, and then drives the curtain cloth to move, so as to realize the opening and closing of the curtain cloth.

The unique winding structure adopted by the invention ensures that the length of the conveyor belt remains unchanged and the conveyor belt is always in a tensioned state during the opening and closing of the curtain; the curtain guide rail of the invention is stretched and retracted to drive the positions of two fixed pulleys to change at the same time, the stretching and retracting operation is simple, the floor area is small, it is conducive to mass industrial production, has a wide range of application, and reduces the transportation cost and production cost.

Refer to <FIG>, the telescopic curtain guide rail of the embodiment includes a rail trolley of curtain <NUM>, the rail trolley of curtain <NUM> is connected to the conveyor belt <NUM> and extends out of the outer rail <NUM> (also referred to as outer guide rail) and the inner rail <NUM> (also referred to as inner guide rail), the rail trolley of curtain <NUM> is fixed at a lower end of the conveyor belt <NUM>, the rail trolley of curtain <NUM> is movable along an axial direction of the outer rail <NUM> and the inner rail <NUM> driven by the conveyor belt <NUM>.

Refer to <FIG>, the rail trolley of curtain <NUM> includes a trolley body <NUM>, a plurality of first pulleys <NUM> and a plurality of second pulleys <NUM>, the plurality of first pulleys <NUM> and the plurality of second pulleys <NUM> are rotatably connected to the trolley body <NUM>, the trolley body <NUM> includes an upper main body (also referred to as upper trolley body) and a lower main body (also referred to as lower trolley body) connected to the upper main body, both sides of the upper main body are provided with the plurality of first pulleys <NUM> and the plurality of second pulleys <NUM>, bottoms of the plurality of first pulleys <NUM> form a first sliding surface, bottoms of the plurality of second pulleys <NUM> form a second sliding surface, and the second sliding surface is higher than the first sliding surface.

In an illustrated embodiment, the inner rail <NUM> is provided with a first sliding support surface <NUM>, the outer rail <NUM> is provided with a second sliding support surface <NUM>, when the rail trolley of curtain <NUM> slides in the inner rail <NUM>, one of the first pulley <NUM> and the second pulley <NUM> is supported on the first sliding support surface <NUM>, or when the rail trolley of curtain <NUM> slides in the outer rail <NUM>, the other one of the first pulley <NUM> and the second pulley <NUM> is supported on the second sliding support surface <NUM>; and a height difference between the first sliding support surface <NUM> and the second sliding support surface <NUM> is matched with a height difference between the second sliding surface and the first sliding surface.

The technical principle of the embodiment: the inner rail <NUM> and the outer rail <NUM> are respectively provided with the first sliding support surface <NUM> and the second sliding support surface <NUM>; the first pulleys <NUM> arranged on the rail trolley of curtain form the first sliding surface, and the second pulleys <NUM> arranged on the rail trolley of curtain form the second sliding surface, the height difference between the first sliding support surface <NUM> and the second sliding support surface <NUM> is adapted to the height difference between the second sliding surface and the first sliding surface to eliminate the influence of the height difference between the inner rail <NUM> and the outer rail <NUM> on the movement of the rail trolley of curtain (also referred to as curtain rail trolley, curtain mover, curtain slider).

Each of the bottom of the first pulley <NUM> and the bottom of the second pulley <NUM> refers to one end surface of the supporting pulley of the rail trolley of curtain when in use. The first sliding surface can be understood as that ends of the supporting the plurality of first pulleys <NUM> is in the same horizontal plane, and the second sliding surface can be understood as that ends of the supporting the plurality of second pulleys <NUM> is in the same horizontal plane. The first sliding support surface <NUM> refers to a support surface arranged in the inner rail <NUM> and matched with the first sliding surface. When the rail trolley of curtain moves in the inner rail, the support surface plays a supporting role against the bottoms of the first pulleys. The second sliding support surface <NUM> refers to a support surface arranged in the outer rail <NUM> and matched with the second sliding surface. When the rail trolley of curtain moves in the outer rail, the support surface plays a supporting role against the bottoms of the second pulleys.

As shown in <FIG>, in an illustrated embodiment, the first pulley <NUM> is arranged coaxially with the second pulley <NUM>, and a radius of the first pulley <NUM> is greater than that of the second pulley <NUM>; or
the first pulley <NUM> and the second pulley <NUM> have different rotation axes, the rotation axes of the first pulley <NUM> and the second pulley <NUM> are parallel and have a same height, and a radius of the first pulley <NUM> is greater than that of the second pulley <NUM>. The radius of the first pulley <NUM> is larger than that of the second pulley <NUM>, when used with the curtain guide rail, it cooperates with the first sliding support surface <NUM> and the second sliding support surface <NUM>, when the rail trolley of curtain is located on the outer rail <NUM>, the first pulley <NUM> has the function of limiting both sides of the rail trolley of curtain because the diameter of the first pulley <NUM> is larger than that of the second pulley <NUM> and the distance between them is smaller.

As shown in <FIG>, in an illustrated embodiment, the first pulley <NUM> is arranged coaxially with the second pulley <NUM>, or the first pulley <NUM> and the second pulley <NUM> have different rotation axes, the first pulley <NUM> and the second pulley <NUM> are arranged in a staggered manner in an axial direction of the first pulley <NUM> and the second pulley <NUM>, correspondingly, the first sliding support surface <NUM> and the second sliding support surface <NUM> are arranged in a staggered manner in the axial direction of the first pulley and the second pulley. Coaxial setting or parallel design of rotating shafts makes the structure of the rail trolley of curtain more compact and more convenient for production and installation. The staggered setting of the first sliding support surface <NUM> and the second sliding support surface <NUM> matches the setting of the first pulley <NUM> and the second pulley <NUM>, so as to solve the problem of unstable operation between the inner rail <NUM> and the outer rail <NUM> of the rail trolley of curtain.

In an illustrated embodiment, as shown in <FIG>, the first pulley <NUM> is arranged coaxially with the second pulley <NUM>, the first pulley <NUM> is close to the trolley body <NUM>, the second pulley <NUM> is located on a side of the first pulley <NUM> facing away from the trolley body <NUM>, and the first pulley <NUM> is integrally formed with the second pulley <NUM>. The integrated design makes the structure of the rail trolley of curtain more compact, saves materials and is more convenient for production and installation.

As shown in <FIG>, in an illustrated embodiment, the rail trolley of curtain <NUM> further includes a plurality of first guide wheels <NUM>, the first guide wheel <NUM> is rotatably connected to the upper main body, the first guide wheel <NUM> transversely penetrates through the upper main body and wheel edges of the plurality of first guide wheels protrude outward relative to sides of the upper main body in a transverse direction, the plurality of first guide wheels <NUM> are rotatable in the transverse direction, and the first guide wheel <NUM> is higher than the second sliding support surface <NUM>.

As shown in <FIG>, in an illustrated embodiment, the rail trolley of curtain <NUM> further includes a plurality of second guide wheels <NUM>, the second guide wheel <NUM> is installed on a top of the upper main body and rotatable in the transverse direction, wheel edges of the second guide wheel <NUM> protrude outward relative to the sides of the upper main body in the transverse direction, the second guide wheel is higher than the first guide wheel <NUM>, and a radius of the second guide wheel <NUM> is different from that of the corresponding first guide wheel <NUM>.

As shown in <FIG>, in an illustrated embodiment, the inner rail <NUM> is provided with a first guide groove <NUM> therein, the outer rail <NUM> is provided with a second guide groove <NUM> therein; when the rail trolley of curtain <NUM> slides in the inner rail <NUM>, one of the first guide wheel <NUM> and the second guide wheel <NUM> is located in the first guide groove <NUM> and matched with the first guide groove <NUM>, or when the rail trolley of curtain <NUM> slides in the outer rail <NUM>, the other one of the first guide wheel <NUM> and the second guide wheel <NUM> is located in the second guide groove <NUM> and matched with the second guide groove <NUM>; widths of the first guide groove <NUM> and the second guide groove <NUM> are different, and a width difference between the first guide groove <NUM> and the second guide groove <NUM> is matched with a diameter difference between the first guide wheel <NUM> and the corresponding second guide wheel <NUM>. The transverse limit of the rail trolley of curtain can be realized through the combination of the guide wheel and the guide groove, so that the rail trolley of curtain can run smoothly in the transverse direction.

As shown in <FIG>, in an illustrated embodiment, the plurality of first pulleys <NUM> have a same size and are symmetrically arranged on two sides of the trolley body <NUM>, and the plurality of second pulleys <NUM> have a same size and are symmetrically arranged on the two sides of the trolley body <NUM>. The rail trolley of curtain <NUM> further includes a plurality of outer pulleys <NUM> arranged on the two sides of the trolley body <NUM> in pairs, and the plurality of outer pulleys <NUM> are located below the first sliding surface and is spaced a predetermined height from the first sliding surface. The outer pulley <NUM> can make the rail trolley of curtain transition smoothly between the inner rail <NUM> and the outer rail <NUM>, and can limit the upward movement of the rail trolley of curtain.

As shown in <FIG>, the rail trolley of curtain <NUM> includes the trolley body <NUM> and a plurality of pulleys, in an illustrated embodiment, the trolley body <NUM> includes an upper main body and a lower main body connected to the upper main body, the upper main body is rotatably installed with the plurality of pulleys, the upper main body is provided with first threading through holes <NUM>, the lower main body is provided with the second threading through holes <NUM>.

As shown in <FIG>, in an illustrated embodiment, the conveyor belt <NUM> includes a first conveyor belt and a second conveyor belt, the second conveyor belt is engaged with the driving wheel <NUM> or the driven wheel <NUM>, the first conveyor belt is a rope, the first conveyor belt is connected to the second conveyor belt in an annular shape and sleeved on the driving wheel <NUM> and the driven wheel <NUM> to make the driving wheel <NUM> in transmission connection with the driven wheel <NUM>. The rail trolley of curtain <NUM> is connected to the first conveyor belt and move on the outer rail <NUM> and/or the inner rail <NUM> driven by the first conveyor belt, the upper main body of the rail trolley of curtain <NUM> is slidable in the outer rail <NUM> and/or the inner rail <NUM>, the lower main body of the rail trolley of curtain <NUM> is located outside the outer rail <NUM> and the inner rail <NUM>, the first conveyor belt sequentially passes through the first threading through holes <NUM> and the second threading through holes <NUM> to be fixed on the rail trolley of curtain <NUM>.

As shown in <FIG>, in an illustrated embodiment, the first threading through hole <NUM> and the second threading through hole <NUM> of the rail trolley of curtain <NUM> are generally used together with the conveyor belt <NUM>. The conveyor belt <NUM> can be composed of the first conveyor belt and the second conveyor belt. Generally, the first conveyor belt is a steel wire rope <NUM>, the second conveyor belt is a synchronous belt <NUM>, and the curtain guide rail is generally a curtain guide rail with relatively stretched and retracted sliding between the outer rail <NUM> and the inner rail <NUM>. Threading mode of the steel wire rope <NUM> on the rail trolley of curtain <NUM>: the steel wire rope <NUM> sequentially passes through the first end opening <NUM> of the first threading through hole <NUM>, the second end opening <NUM> of the first threading through hole <NUM>, the third threading through hole <NUM>, the second through hole upper opening <NUM> of the second threading through hole <NUM> and the second through hole lower opening <NUM> of the second threading through hole <NUM>, and then is fixed with the threading fixed device <NUM>.

As shown in <FIG>, in an illustrated embodiment, the curtain guide rail is generally provided with a synchronous wheel, a driven wheel, a conveyor belt <NUM> and a plurality of rail trolley of curtains <NUM>. The synchronous wheel and the driven wheel are respectively fixed on both ends of the curtain guide rail, and the lower main body of the rail trolley of curtain <NUM> extends out of the curtain guide rail. The synchronous belt <NUM> is disposed on one end of the synchronous wheel (also referred to as second rotating wheel <NUM>), The synchronous belt is sequentially connected with the synchronous wheel, the rail trolley of curtain <NUM>, the driven wheel (also referred to as first rotating wheel <NUM>) and the synchronous wheel to form a ring. A number of rail trolley of curtain <NUM> can be a plurality of rail trolley of curtains <NUM>, which are connected with the steel wire rope <NUM> and the synchronous belt <NUM>, and any one of them is connected with the steel wire rope <NUM> through the first threading through hole <NUM> and the second threading through hole <NUM>. When the length of the curtain guide rail needs to be adjusted, loosening the threading fixed device <NUM>, pulling the steel wire rope <NUM> through the first threading through hole <NUM> of the lower main body, changing the length of the steel wire rope <NUM> inside the curtain guide rail, so as to change the length of the curtain guide rail, and tightening the threading fixed device <NUM> after adjustment. The lead structure of the rail trolley of curtain <NUM> is matched with the curtain guide rail to realize the stretching and retracting of the curtain guide rail, so as to avoid increasing the size of the curtain guide rail. Since one end of the through hole of the lower main body extends outside the curtain guide rail, the length of the steel wire can be temporarily changed through the through hole of the lower main body and the threading fixed device <NUM>, making the adjustment operation convenient and easy, further, the relative positions of the adjacent rail trolley of curtains <NUM> can be quickly changed to meet the requirements of double opening curtains.

As shown in <FIG>, in an illustrated embodiment, the first conveyor belt includes a first rope section and a second rope section, the first rope section and the second rope section are separated from each other, and a first end of the first rope section is connected with a first end of the second conveyor belt, a second end of the first rope section passes through the first threading through hole <NUM> and the second threading through hole <NUM> and is fixed on the rail trolley of curtain <NUM>, a first end of the second rope section is connected with a second end of the second conveyor belt, and a second end of the second rope section passes through the first threading through hole <NUM> and the second threading through hole <NUM> and is fixed on the rail trolley of curtain <NUM>.

In an illustrated embodiment, the first conveyor belt is a steel wire rope <NUM>, and the second conveyor belt is a synchronous belt <NUM>. The steel wire rope <NUM> includes a first steel wire rope section and a second steel wire rope section. The first steel wire rope section and the second steel wire rope section are separated each other, and two first threading through holes <NUM> and two second threading through holes <NUM> are arranged correspondingly; the first steel wire rope section passes through the first threading through hole <NUM> and the second threading through hole <NUM>, and the second steel wire rope section passes through the other first threading through hole <NUM> and the other second threading through hole <NUM>. Through the above setting, the length of the steel wire rope <NUM> in the telescopic curtain guide rail can be easily and quickly adjusted.

As shown in <FIG>, in an illustrated embodiment, the rail trolley of curtain <NUM> further includes a threading fixed device <NUM>, the threading fixed device <NUM> is disposed on a side of the lower main body close to the second threading through holes <NUM> or the threading fixed device <NUM> is disposed in the second threading through holes <NUM>, and the threading fixed device <NUM> fixes the second end of the first rope section and the second end of the second rope section onto the rail trolley of curtain <NUM>.

The threading fixed device <NUM> is disposed in the second threading through hole <NUM>, which means that the threading fixed device <NUM> is partially or completely disposed in the second threading through holes <NUM>, and the steel wire rope <NUM> can be fixed by cooperating with the second threading through hole <NUM>. In an embodiment, the threading fixed device <NUM> is a hole, ring, threading bolt structure, elastic structure, clamping structure and clamping structure arranged on the lower main body, and the steel wire rope <NUM> can be fixed on the lower main body through the threading fixed device <NUM>. In an embodiment, the threading fixed device <NUM> may not be provided, but the steel wire rope <NUM> may be fixed by winding or knotting in the second threading through hole <NUM>.

As shown in <FIG>, in an illustrated embodiment, the second threading through hole <NUM> is a threading bolt hole arranged on the lower main body in a vertical direction, the second threading through hole <NUM> includes a second through hole upper opening and a second through hole lower opening <NUM>, the second through hole lower opening <NUM> is disposed on a bottom of the lower main body; the threading fixed device <NUM> includes threading bolts <NUM> and threading nuts <NUM>, the threading bolts <NUM> are matched with the second threading through holes <NUM> respectively, the threading nuts <NUM> are matched with the second through hole upper openings; the second end of the first rope section and the second end of the second rope section are fixed on the rail trolley of curtain <NUM> by cooperation of the threading bolts <NUM> and threading nuts <NUM>. Through the cooperation of threading bolts <NUM> and threading nuts <NUM>, the steel wire rope <NUM> can be better fixed in the second threading through hole <NUM>. The operation of adjusting steel wire rope <NUM> can be easily carried out by tightening and loosening the threading bolts <NUM> and the threading nuts <NUM>.

As shown in <FIG>, in an illustrated embodiment, portions of the first conveyor belt are distributed on two sides of the trolley body <NUM> of the rail trolley of curtain <NUM>. In an illustrated embodiment, the first conveyor belt is generally a steel wire rope <NUM>, the steel wire rope <NUM> sequentially passes through the first threading through hole <NUM> and the second threading through hole <NUM>. Since any one of the first threading through hole <NUM> and the second threading through hole <NUM> is a threading through hole transversely penetrating through the trolley body <NUM>, the steel wire rope <NUM> is distributed on both sides of the trolley body <NUM>, making it easier for the steel wire rope <NUM> to pull and fix.

As shown in <FIG>, in an illustrated embodiment, the trolley body <NUM> of the rail trolley of curtain <NUM> is further provided with third threading through holes <NUM>, the third threading through holes <NUM> transversely penetrate through the trolley body <NUM> of the rail trolley of curtain <NUM>, and the first conveyor belt passes through the first threading through hole <NUM>, the third threading through hole <NUM> and the second threading through hole <NUM> sequentially in that order. Specifically, the third threading through hole <NUM> is disposed between the first threading through hole <NUM> and the second threading through hole <NUM>, and the third threading through hole <NUM> transversely penetrates through the trolley body <NUM>. The setting of the third threading through holes <NUM> can make the steel wire rope <NUM> fit the trolley body <NUM>.

As shown in <FIG>, in an illustrated embodiment, the first threading through hole <NUM> includes a first end opening <NUM> and a second end opening <NUM> connected with the first end opening <NUM>, the first end opening <NUM> is disposed on one side of the upper main body, and the second end opening <NUM> is disposed on the other side of the upper main body; the first end opening <NUM> disposed on the one side surface of the upper main body is higher than ones of the plurality of pulleys disposed on the one side surface of the upper main body and outward protruding parts of the ones of the plurality of pulleys disposed on the one side surface of the upper main body, and the second end opening <NUM> disposed on the other side of the upper main body is lower than the others of the plurality of pulleys disposed on the other side of the upper main body and outward protruding parts of the others of the plurality of pulleys disposed on the other side of the upper main body. The portions of the conveyor belt from the first end opening <NUM> to the first rotating wheel <NUM> and from the first end opening <NUM> to the second rotating wheel <NUM> is higher than the pulleys located on the same side and the outward protruding part of the pulleys located on the same side.

The pulleys of the trolley body <NUM> includes the first pulleys <NUM>, the second pulleys <NUM>, the first guide pulleys <NUM> and the second guide pulleys <NUM>. The first guide wheel <NUM> and the second guide wheel <NUM> are rotatably connected to the upper main body, the first guide wheel <NUM> transversely penetrates through the upper main body, and in the transverse direction, the wheel edges of the first guide wheels <NUM> protrude outward relative to the sides of the upper main body; the first pulley <NUM> and the second pulley <NUM> are rotatably connected to both sides of the upper main body <NUM>. The above pulleys located on the same side refers to the first pulleys <NUM> and the second pulleys <NUM> are located on the same side; the outward protruding parts of the pulleys located on the same side refers to the outward protruding parts of the first guide wheels <NUM> and the second guide wheels <NUM> with respect to the sides of the upper main body. This arrangement can reduce the transverse dimension of the rail trolley of curtain <NUM> and separate the pulleys of the rail trolley of curtain <NUM> from the steel wire rope <NUM> to avoid the steel wire rope <NUM> blocking and winding the rail trolley of curtain <NUM> during operation.

As shown in <FIG>, in an illustrated embodiment, the first threading through hole <NUM> is an arc through hole transversely penetrating through the trolley body <NUM>, and the first end opening <NUM> and the second end opening <NUM> are disposed on the two sides of the trolley body <NUM> in a staggered manner. The first threading through hole <NUM> is an arc through hole, or the middle part of the first threading through hole <NUM> is an arc through hole; When the steel wire rope <NUM> is adjusted through the arc-shaped through hole, the pulling is smoother; the staggered setting of the first end opening <NUM> and the second end opening <NUM> can reduce the transverse size of the curtain guide pulley <NUM>, and optimize the transverse and longitudinal stress of the steel wire rope <NUM> and the threading through hole, making it easier for the steel wire rope <NUM> to pull and fix.

As shown in <FIG>, the telescopic curtain guide rail further includes a curtain guide rail fixed device <NUM>, the curtain guide rail fixed device <NUM> includes a guide sleeve <NUM>, and the guide sleeve <NUM> is hollow tubular structure with openings at both ends, and the guide sleeve <NUM> is sleeved outside a connection between the outer rail <NUM> and the inner rail <NUM>, the connecting end of the outer rail <NUM> is inserted into the guide sleeve <NUM> from the second end of the guide sleeve <NUM> and matched with the guide sleeve <NUM>, the free end of the outer rail <NUM> extends out from the guide sleeve <NUM>, the inner rail <NUM> is inserted into the guide sleeve <NUM> from the first end of the guide sleeve <NUM> and matched with the guide sleeve <NUM>, and the connecting end of the inner rail <NUM> is inserted into the outer rail <NUM>, the free end of the inner rail <NUM> extends out of the guide sleeve <NUM>, and the rail trolley of curtain <NUM> can pass through the guide sleeve <NUM> when moves between the outer rail <NUM> and the inner rail <NUM>.

In an illustrated embodiment, the upper main body of the rail trolley of curtain <NUM> is located in the outer rail <NUM> and the inner rail <NUM>, the lower main body of the rail trolley of curtain <NUM> is located outside the outer rail <NUM> and the inner rail <NUM>, and the upper main body and the lower main body move along both ends of the inner rail <NUM> and the outer rail <NUM>. When in use, the length of the conveyor belt is fixed, which can limit the stretching of the curtain guide rail, when used in conjunction with the curtain guide rail fixed device <NUM>, the telescopic curtain guide rail can be fixed to prevent it from stretching and retracting inward. The free ends of the outer rail <NUM> and the inner rail <NUM> refer to the ends of the outer rail <NUM> and the inner rail <NUM> relative to the ends matching with the guide sleeve <NUM>.

As shown in <FIG>, in an illustrated embodiment, a bottom surface of the guide sleeve <NUM> is provided with a first support surface <NUM> and a second support surface <NUM>, the first support surface <NUM> extends inward along an axial direction of the guide sleeve <NUM> from the first end of the guide sleeve <NUM>, the second support surface <NUM> extends inward along the axial direction of the guide sleeve <NUM> from the second end of the guide sleeve <NUM>, the first support surface <NUM> is connected with the second support surface <NUM>, the first support surface <NUM> is higher than the second support surface <NUM>, and a step is formed at a connection between the first support surface <NUM> and the second support surface <NUM>, the first support surface <NUM> supports the inner rail <NUM>, the second support surface <NUM> supports the outer rail <NUM>, the outer rail <NUM> abuts against at the step, a height difference of bottom surfaces of the outer rail <NUM> and the inner rail <NUM> is matched to a height difference between the second support surface <NUM> and the first support surface <NUM>. The outer rail <NUM> abuts against at the step here can be understood as that the outer rail <NUM> is connected with the step, and the step resists the movement of the outer rail <NUM> to the first end of the guide sleeve <NUM>. The first support surface <NUM> is higher than the second support surface <NUM> with reference to the bottom surface of the guide sleeve <NUM>. The above mentioned higher in the invention refers to taking the plane of the outer surface at the bottom of the guide sleeve <NUM> as a reference.

The second support surface <NUM> can be matched with the outer rail <NUM>, the outer rail <NUM> is limited by the step where the first support surface <NUM> is connected with the second support surface <NUM>, and the first support surface <NUM> can be matched with the inner guide rail <NUM>, the inner guide rail <NUM> can slide along the first support surface <NUM> from the first end of the guide sleeve <NUM> and extend into the outer rail <NUM>, adjusting the position where the inner rail <NUM> extends into the outer rail <NUM> to achieve the required length of the curtain guide rail, then, the curtain guide rail can be fixed with the fixed component <NUM>. The fixed component <NUM> can match with the guide sleeve <NUM> to restrict the relative stretching and retracting of the inner rail <NUM> and the outer rail <NUM> inward. The curtain guide rail fixed device <NUM> can also be used in conjunction with curtain guide rail conveying mechanisms such as conveyor belts or conveyor ropes, when the curtain guide rail transmission mechanism is in use, the length of the curtain guide rail transmission mechanism is fixed, which can limit the outward stretching of the curtain guide rail. Therefore, the curtain guide rail fixed device <NUM> and the curtain guide rail transmission mechanism can fix the telescopic curtain rod guide rail to prevent it from stretching outward and retracting inward.

As shown in <FIG>, in an illustrated embodiment, the bottom surface of the guide sleeve <NUM> is provided with a through groove <NUM> penetrating the first support surface <NUM> and the second support surface <NUM>, a bottom of the inner rail <NUM> is provided with a first sliding opening <NUM> along the axial direction, a bottom of the outer rail <NUM> is provided with a second sliding opening <NUM> along the axial direction, the first sliding opening <NUM> is communicated with the second sliding opening <NUM>.

As shown in <FIG>, in an illustrated embodiment, two ends of the through groove <NUM> are respectively communicated with the first sliding opening <NUM> and the second sliding opening <NUM>. Specifically, the first sliding opening <NUM> is wider than the second sliding opening <NUM> and is a rectangular opening. The first sliding opening <NUM> and the second sliding opening <NUM> are respectively arranged at the middles of the bottoms of the inner rail <NUM> and the bottom of the outer rail <NUM>. The first sliding opening <NUM> and the second sliding opening <NUM> are communicated with each other and are communicated with the through groove <NUM>, so that the curtain guide rail components such as the rail trolley of curtain <NUM> protruding outside the curtain guide rail can move between the inner rail <NUM> and the outer rail through the guide sleeve <NUM>.

As shown in <FIG>, in an illustrated embodiment, the through groove <NUM> includes a first through section <NUM> and a second through section <NUM>, the first through section <NUM> is communicated with the second through section <NUM>, positions of the first through section <NUM> and the second through section <NUM> correspond to positions of the first support surface <NUM> and the second support surface <NUM> respectively, a width of the first through section <NUM> close to the first end of the guide sleeve <NUM> is greater than a width of the first sliding opening <NUM>, a width of the first through section <NUM> close to the second through section <NUM> is matched with the width of the first sliding opening <NUM>.

In an illustrated embodiment, a width of the second through section <NUM> is matched with a width of the second sliding opening <NUM>. Specifically, the first sliding opening <NUM> is wider than the second sliding opening <NUM> and is a rectangular opening. The first sliding opening <NUM> and the second sliding opening <NUM> are respectively arranged in the middle of the bottom of the inner rail <NUM> and the bottom of the outer rail <NUM>. The width of the first sliding opening <NUM> refers to the distance between its two sides parallel to the axial direction of the inner rail <NUM>; the width of the second sliding opening <NUM> refers to the distance between its two sides parallel to the axial direction of the outer rail <NUM>. When in use, the width of the first through section <NUM> close to the first end of the guide sleeve <NUM> is greater than the first sliding opening <NUM> of the inner rail <NUM>, and the width of the first through section <NUM> close to the second through section <NUM> corresponds to the width of the first sliding opening <NUM> of the inner rail; the width of the second through section <NUM> corresponds to the width of the first sliding opening <NUM> of the outer rail <NUM>. The communication among the through groove <NUM> of the guide sleeve <NUM>, the first sliding opening <NUM> of the inner rail <NUM> and the first sliding opening <NUM> of the outer rail <NUM> is smoother, and the curtain guide rail components such as the rail trolley of curtain <NUM> pass through them more smoothly.

As shown in <FIG>, in an illustrated embodiment, the plurality of second pulleys <NUM> are rotatably installed on the rail trolley of curtain <NUM>, the guide sleeve <NUM> further includes transition tables <NUM>, the transition tables <NUM> protrude upward relative to the first sliding support surface <NUM>, the transition tables are extended outward along the axial direction of the guide sleeve <NUM> from the connection between the first sliding support surface <NUM> and the second sliding support surface <NUM>, an inner surface of the bottom of the outer rail <NUM> is provided with a second sliding support surface <NUM>, the second sliding support surface <NUM> is axially extended from the connecting end of the outer rail <NUM> towards the other end of the outer rail <NUM>, the second sliding support surface <NUM> is higher than the inner surface of the bottom of the outer rail <NUM>; when the outer rail <NUM> is matched with the guide sleeve <NUM>, the transition tables <NUM> are butted and matched with the second sliding support surface <NUM> in the axial direction of the guide sleeve <NUM>, and the second sliding support surface <NUM> is higher than the transition tables <NUM>, the second pulley <NUM> can slidable upward from the transition table <NUM> to the second sliding support surface <NUM> or downward from the second sliding support surface <NUM> to the transition table <NUM>.

The height of the transition table <NUM> (related to the first support surface <NUM>) is lower than that of the second sliding support surface <NUM> (related to the inner bottom surface of the outer rail <NUM>). The height of the transition table <NUM> is generally one-half of the height of the second sliding support surface <NUM>. This arrangement can solve the problem that when the height of the second sliding support surface <NUM> is high, the pulleys of the rail trolley of curtain <NUM> move on second sliding support surface <NUM> are unstable. For example, it can solve the problem that when the height of the second sliding support surface <NUM> is higher than the pulley radius of the rail trolley of curtain <NUM>, the operation of the rail trolley of curtain <NUM> may be hindered. Therefore, the transition table <NUM> can make the pulleys of the rail trolley of curtain <NUM> move on the second sliding support surface <NUM> more stable and run more smoothly.

In a further embodiment, the rail trolley of curtain is fixed at the lower end of the conveyor belt, the rail trolley of curtain extends out of the outer rail and the inner rail, the rail trolley of curtain can move along the axial direction of the outer rail and the inner rail driven by the conveyor belt, and the rail trolley of curtain can be rotatably installed with the plurality of second pulleys, the second pulleys can slidable upward from the transition table to the second sliding support surface or downward from the second sliding support surface to the transition table.

As shown in <FIG>, in an illustrated embodiment, an upper part of the guide sleeve <NUM> is provided with first guide rails <NUM> and second guide rails <NUM>, the first guide rails <NUM> and the second guide rails <NUM> are respectively disposed on the first support surface <NUM> and the second support surface <NUM> and extend along the axial direction of the guide sleeve <NUM>, the first guide rails <NUM> are connected to the second guide rails <NUM>, connections of the first guide rails <NUM> and the second guide rails <NUM> are provided with steps, the first guide rails <NUM> are matched with a top of the inner rail <NUM> to fix both sides of the inner rail <NUM> relative to the guide sleeve <NUM>.

The second guide rails <NUM> are matched with a top of the outer rail <NUM> to fix both sides of the outer rail <NUM> relative to the guide sleeve <NUM>. The first guide rail <NUM> and the second guide rail <NUM> are located above the first support surface <NUM> and the second support surface <NUM> respectively and extend along the axial direction of the guide sleeve <NUM>, which can be understood as that the first guide rail <NUM> and the second guide rail <NUM> are located in the guide sleeve <NUM> and away from the corresponding top parts of the first support surface <NUM> and the second support surface <NUM>. When in use, the shape of the first guide rail <NUM> is matched with the top end of the inner rail <NUM>, the shape of the second guide rail <NUM> is matched with the top end of the outer rail <NUM>, and the steps can abut against the connecting end of the outer rail <NUM>, so that the guide sleeve <NUM> can limit both sides of the inner rail <NUM>, both sides and the connecting end of the outer rail <NUM>.

As shown in <FIG>, in an illustrated embodiment, an outer surface of the bottom of the guide sleeve <NUM> is provided with a transition surface <NUM>, the transition surface <NUM> is disposed on a back of the first support surface <NUM>, one end of the transition surface <NUM> close to the connection between the first support surface <NUM> and the second support surface <NUM> is matched with the outer rail <NUM>, the other end of the transition surface <NUM> is matched with the inner rail <NUM>, and a height difference between the one end of the transition surface <NUM> matched with the outer rail <NUM> and the other end of the transition surface <NUM> is matched with a height difference between the inner rail <NUM> and the outer rail <NUM>.

A thickness of the bottom surface of the guide sleeve <NUM> gradually becomes thinner from the connection between the first support surface <NUM> and the second support surface <NUM> to the first end of the guide sleeve <NUM>, the outer surface of the bottom of the guide sleeve <NUM> is provided with the transition surface <NUM>, the transition surface <NUM> is disposed on the back of the first support surface <NUM> and on the both sides of the through groove <NUM>. When the bottom surface of the guide sleeve <NUM> is placed on a horizontal plane, the transition surface <NUM> is arranged obliquely relative to the horizontal plane, and a height of the transition surface <NUM> close to the connection between the first support surface <NUM> and the second support surface <NUM> is higher than a height of the transition surface <NUM> close to the first end of the guide sleeve <NUM>. The one end of the transition surface <NUM> close to the connection between the first support surface <NUM> and the second support surface <NUM> is matched with the outer rail <NUM>, the other end of the transition surface <NUM> is matched with the inner rail <NUM>, and the height difference between the one end of the transition surface <NUM> matched with the outer rail <NUM> and the other end of the transition surface <NUM> is matched with the height difference between the inner rail <NUM> and the outer rail <NUM>. It can be understood that the other end of the transition surface <NUM> touches the outer surface of the bottom of the inner rail <NUM>, but it can slide relatively or be slightly spaced. The setting of the transition surface <NUM> enables the outer pulley <NUM> of the rail trolley of curtain <NUM> to transition smoothly among the guide sleeve <NUM>, the inner rail <NUM> and the outer rail <NUM> when the curtain guide rail is used with the rail trolley of curtain <NUM>. When the bottom surface of the guide sleeve is placed on the horizontal plane, the transition surface is inclined relative to the horizontal plane, and the height of the transition surface close to the connection of the first support surface and the second support surface is higher than the height of the transition surface close to the first end of the guide sleeve.

As shown in <FIG>, in an embodiment, the guide sleeve <NUM> further includes a first mating surface <NUM> and a second mating surface <NUM>, the first mating surface <NUM> extends inward along the axial direction of the guide sleeve <NUM> from both sides and a top surface of the first end of the guide sleeve <NUM> and together with the first support surface <NUM> form an annular surface with an opening at a bottom thereof, the second mating surface <NUM> extends inward along the axial direction of the guide sleeve <NUM> from two side surfaces and a top surface of the second end of the guide sleeve <NUM> and together with the second support surface <NUM> form an annular surface with an opening at a bottom thereof. Compared with the second mating surface <NUM>, the first mating surface <NUM> is closer to a central axis of the guide sleeve <NUM>, in the axial direction of the guide sleeve <NUM>, the first mating surface <NUM> is connected with the second mating surface <NUM>, and a step is formed at a connection between the first mating surface <NUM> and the second mating surface <NUM>.

Specifically, an annular surface surrounded by the first mating surface <NUM> and the first support surface <NUM> is located in an annular surface surrounded by the second mating surface <NUM> and the second support surface <NUM>. The distance between the two annular surfaces corresponds to the height difference between the inner guide rail <NUM> and the outer rail <NUM> of the curtain guide rail, so that one end of the inner guide rail <NUM> can smoothly pass through the guide sleeve <NUM> and be inserted into the outer rail <NUM>, so as to ensure that the curtain guide rail components such as the rail trolley of curtain <NUM> can make a smooth transition between the interior of the inner rail <NUM>, the interior of the outer rail <NUM> and the interior of the guide sleeve <NUM>. Compared with the second mating surface <NUM>, the first mating surface <NUM> is closer to the central axis of the guide sleeve <NUM>, which can be understood as two coaxial semi-annular surfaces spaced internally and externally; the two side surfaces and top surfaces of the first end and the two side surfaces and top surfaces of the second end are directed to the two sides and the top surface inside the guide sleeve <NUM>.

As shown in <FIG>, in an embodiment, the curtain guide rail fixed device <NUM> further includes a fixed component <NUM>, the fixed component <NUM> passes through an outer housing of the guide sleeve <NUM> from outside of the guide sleeve <NUM> and partially extends into the guide sleeve <NUM>, the fixed component is connected with the inner rail and/or the outer rail to fix the inner rail and/or the outer rail relative to the guide sleeve.

In an embodiment, the fixed component <NUM> can pass through the housing of the guide sleeve <NUM> from the top surface, bottom surface and two sides of the guide sleeve <NUM>, and partially extend into the guide sleeve <NUM>. The preferred solution is to pass through the housing of the guide sleeve <NUM> from the top surface of the guide sleeve <NUM>.

In an embodiment, the fixed component <NUM> includes a spiral connection fixing, a clamping fixing, a snap spring fixing, a spring fixing and a clamping fixing structure, etc. Specifically, the fixed component <NUM> is a bolt fixed component. The bolt fixed component includes a fixed bolt <NUM>, a fixed bolt hole <NUM> and a T-shaped nut <NUM>. The upper part of the T-shaped nut <NUM> is smaller than the lower part. A limit part <NUM> with an opening at one hollow end is arranged in the guide sleeve <NUM>, and the opening faces into the guide sleeve <NUM>, the upper part of the T-shaped nut <NUM> can be nested in the limit part <NUM>, and the fixed bolt <NUM> passes through the limit part and is connected with the T-shaped nut <NUM> through the fixed bolt hole <NUM>; when the fixed bolt <NUM> and the T-shaped nut <NUM> rotate and fit in the fixed bolt hole <NUM>, the limit part <NUM> limits the upper part of the T-shaped nut <NUM>, and the T-shaped nut <NUM> can move outside the guide sleeve <NUM>. The T-shaped nut <NUM> can better fix the inner rail <NUM> and the guide sleeve <NUM>.

Referring to <FIG>, in an embodiment, the curtain guide rail fixed device <NUM> further includes a fixed component <NUM>, which passes through the housing of the guide sleeve <NUM> from the outside of the guide sleeve <NUM> and partially extends into the guide sleeve <NUM>. The fixed component <NUM> is connected with the inner rail <NUM> and/or the outer rail <NUM> to fix the inner rail <NUM> and / or the outer rail <NUM> relative to the guide sleeve <NUM>. The preferred solution is to pass through the housing of the guide sleeve <NUM> from the top surface of the guide sleeve <NUM>. In an embodiment, the fixed component <NUM> includes a helical connection fixing, a clamping fixing, a snap spring fixing, a spring fixing and a clamping fixing structure, etc..

Referring to <FIG>, in an embodiment, the fixed component <NUM> is a fixed bolt <NUM>, the guide sleeve <NUM> is also provided with a fixed bolt hole matched with the fixed bolt <NUM>, the fixed bolt hole passes through the guide sleeve <NUM>, and the fixed bolt <NUM> can extend into the guide sleeve <NUM> through the fixed bolt hole to fix the inner guide rail <NUM>.

Referring to <FIG>, in an embodiment, the fixed component <NUM> includes a fixed bolt <NUM> and a fixed plate, the fixed plate is disposed in the guide sleeve <NUM>, and both the guide sleeve <NUM> and the fixed plate are provided with fixed bolt holes matched with the fixed bolt <NUM>, under the rotating cooperation of the fixed bolt <NUM> and the fixed bolt holes, the fixed plate moves inward to press and fix the inner rail <NUM> or moves outward to clamp and fix the inner rail <NUM> between the fixed plate and the guide sleeve <NUM>. In an embodiment, the fixed component <NUM> is a bolt fixed component, the bolt fixed component includes a fixed bolt <NUM>, a fixed bolt hole <NUM> and a T-shaped nut <NUM>. The upper part of the T-shaped nut <NUM> is smaller than the lower part. A limit part <NUM> with an opening on one hollow end is arranged in the guide sleeve <NUM>, the opening faces into the guide sleeve <NUM>, and the upper part of the T-shaped nut <NUM> can be nested in the limit part <NUM>, the fixed bolt <NUM> penetrates the limit part and is connected with the T-shaped nut <NUM> through the fixed bolt hole <NUM>. When the fixed bolt <NUM> and the T-shaped nut <NUM> rotate and fit in the fixed bolt hole <NUM>, the limit part <NUM> limits the upper part of the T-shaped nut <NUM>, and the T-shaped nut <NUM> can move outside the guide sleeve <NUM>. The T-shaped nut <NUM> can better fix the inner rail <NUM> and the guide sleeve <NUM>.

As shown in <FIG>, in an embodiment, the telescopic curtain guide rail further includes an adjusting component fixedly connected with the first fixed pulley <NUM> and/or the second fixed pulley <NUM>, the adjusting component is configured to cooperate with the first fixed pulley <NUM> and/or the second fixed pulley <NUM> to drive the first fixed pulley <NUM> and/or the second fixed pulley <NUM> to move, thereby to tension or loosen the conveyor belt, the adjusting of length of the conveyor belt is realized. Avoiding that the length of the conveyor belt is too long and the conveyor belt will run out. It can also avoid that the conveyor belt is too short and affect the smoothness of operation.

The telescopic curtain guide rail provided by the invention realizes the movement of the fixed pulley through the adjusting component, thus realizing the adjustment of the length of the conveyor belt <NUM>, realizing the change of the tension of the conveyor belt <NUM>, and overcoming the problem that it is difficult to accurately control the length of the conveyor belt <NUM> during the assembly of the curtain guide rail. After the curtain guide rail is assembled, the fine adjustment of the length of the conveyor belt <NUM> can be realized through the adjustment of the adjusting component.

As shown in <FIG>, in an embodiment, the adjusting component includes an adjusting nut <NUM> and an adjusting screw <NUM> matched with the adjusting nut <NUM>, and a cooperation of the adjusting screw <NUM> and the adjusting nut <NUM> drives the first fixed pulley <NUM> and/or the second fixed pulley <NUM> to move, so as to control the tension of the conveyor belt. In this embodiment, one of the first fixed pulley <NUM> or the second fixed pulley <NUM> can be adjusted separately through the adjusting component, or the first fixed pulley <NUM> and the second fixed pulley <NUM> can be adjusted simultaneously through the adjusting component.

As shown in <FIG>, in an embodiment, the adjusting component further includes a stopper <NUM>, upper and lower ends of the adjusting nut <NUM> extend towards the stopper <NUM> and are connected with the stopper <NUM>, the first fixed pulley and/or the second fixed pulley are disposed in an installation area. In an embodiment, the adjusting component adjusts the tightness of the conveyor belt <NUM> by adjusting the movement of the first fixed pulley <NUM>. In this embodiment, the first fixed pulley <NUM> is fixed on the adjusting component, specifically, the first fixed pulley <NUM> is installed and fixed in the installation area formed between the stopper <NUM> and the adjusting nut <NUM>, the side of the stopper <NUM> close to the first fixed pulley is an arc surface, and the conveyor belt <NUM> on two sides of the first fixed pulley <NUM> are respectively located on two sides of the stopper <NUM>. In this embodiment, by setting the stopper <NUM>, it can better fix the first fixed pulley <NUM> and realize that the adjusting component can drive the first fixed pulley <NUM> to move. The side of the stopper <NUM> close to the adjusting nut <NUM> is an arc surface, which can avoid the friction damage of the stopper <NUM> to the conveyor belt <NUM>.

Referring to <FIG>, the telescopic curtain guide rail includes the guide sleeve <NUM>, which is a hollow tubular structure with openings at both ends, the bottom surface of the guide sleeve <NUM> is formed with the first support surface <NUM> and the second support surface <NUM>, the first support surface <NUM> is higher than the second support surface <NUM>, and a step <NUM> is formed at the connection between the first support surface <NUM> and the second support surface <NUM>, the guide sleeve <NUM> is sleeved at one end of the outer rail <NUM> close to the inner rail <NUM>, the inner rail <NUM> is connected with the first support surface <NUM>, the outer rail is connected with the second support surface <NUM>, the end of the outer rail <NUM> abuts against the step <NUM>, the adjusting component is located in the guide sleeve <NUM>, and the adjusting component is slidably connected with the guide sleeve <NUM>. In this embodiment, the inner rail <NUM> and the outer rail <NUM> are connected through the guide sleeve <NUM> to realize the smooth transition between the inner rail <NUM> and the outer rail <NUM>, so as to ensure that the curtain can be pulled smoothly during normal use. The setting of the guide sleeve <NUM> can not only transition the connection between the inner rail <NUM> and the outer rail <NUM>, making the guide rail more beautiful, but also realize the relative movement of the adjusting component, so as to drive the movement of the first fixed pulley <NUM> and realize the control of the tension of the conveyor belt.

Referring to <FIG>, the guide sleeve <NUM> is provided with an adjusting installation groove <NUM>, the adjusting installation groove <NUM> is arranged in the space surrounded by the first support surface <NUM>, the adjusting component is fixed in the adjusting installation groove <NUM>, one end of the adjusting installation groove <NUM> is provided with an opening, the other end of the adjusting installation groove <NUM> is provided with a baffle <NUM>, the opening is arranged at one end close to the second support surface <NUM>, and the baffle <NUM> is provided with a through hole <NUM> that can insert the screw. The setting of the baffle <NUM> can better limit the adjusting component to the adjusting installation groove <NUM>. The setting of the opening enables the conveyor belt <NUM> to extend into the adjusting installation groove <NUM> and connect with the first fixed pulley, and the conveyor belt <NUM> on the other side of the first fixed pulley can also extend out from the adjusting installation groove <NUM>. The adjusting screw is matched with the adjusting nut through the through hole. When the adjusting screw to rotate, it can drive the adjusting component away from or close to the baffle. The belt tension is adjusted by adjusting the distance between the adjusting component and the baffle <NUM>.

Referring to <FIG>, in an embodiment, the top wall of the adjusting installation groove is provided with the first opening <NUM>, and the bottom wall of the adjusting installation groove is provided with the second opening <NUM> opposite to the first opening <NUM>, and the first fixed pulley and/or the second fixed pulley are fixed in the installing area of the adjusting component through the fixed shaft <NUM>, and the two ends of the fixed shaft <NUM> are respectively extended into the first opening <NUM> and the second opening <NUM>.

Referring to <FIG>, in an embodiment, the outer rail <NUM> includes an upper-end first closed groove <NUM> and a lower-end first opening groove <NUM>, the side wall of the lower-end first opening groove <NUM> is provided with a first outer rail inner wall <NUM> and a second outer rail inner wall <NUM> extending inwardly towards the groove, and a first insertion gap <NUM> is formed between the bottom wall of the upper-end first closed groove <NUM> and the first outer rail inner wall <NUM>, a second insertion gap <NUM> is formed between the bottom wall of the lower-end first opening groove <NUM> and the second outer rail inner wall <NUM>, and the conveyor belt <NUM> is located between the first outer rail inner wall <NUM> and the second outer rail inner wall <NUM>; the inner rail <NUM> includes an upper-end second closed groove and a lower-end second opening groove, the bottom wall of the upper-end second closed groove is inserted into the first insertion gap <NUM>, and the bottom wall of the lower-end second open groove is inserted into the second insertion gap <NUM>. This mode can realize better nesting of the inner rail <NUM> and the outer rail <NUM>, better cooperation between the inner rail <NUM> and the outer rail <NUM>, and better stability of curtain guide rail.

Referring to <FIG>, in an embodiment, the end of the first outer rail inner wall <NUM> abuts against the top wall of the adjusting installation groove <NUM>, and the end of the second outer rail inner wall <NUM> abuts against the bottom wall of the adjusting installation groove <NUM>. There is a third insertion gap <NUM> between the bottom wall of the adjusting installation groove <NUM> and the first support surface <NUM>, and the bottom wall of the lower-end second opening groove passes through the third insertion gap <NUM> and is inserted into the second insertion gap <NUM>. In this embodiment, the adjusting component is fixed by the adjusting installation groove <NUM> to achieve a more stable effect. At the same time, the top wall and bottom wall of the adjusting installation groove can match with the first outer rail inner wall <NUM> and the second outer rail inner wall <NUM>, so that the end of the outer rail <NUM> can better match with the inner rail <NUM> in the guide sleeve <NUM>.

Referring to <FIG>, in an embodiment, when the inner rail <NUM> is matched with the outer rail <NUM>, the first side wall <NUM> of the inner rail <NUM> divides the lower-end first opening groove into the first cavity and the second cavity, the second fixed pulley <NUM> is fixed on the inner rail <NUM> through the second fixed component, the second fixed component is provided with a connecting clamp <NUM>, and the connecting clamp <NUM> clamps the end of the first side wall <NUM>. The portions of the conveyor belt <NUM> located on two sides of the second fixed pulley <NUM> are located in the first cavity and the second cavity respectively. In this embodiment, the second fixed pulley <NUM> is fixed by the connecting clamp <NUM>. After the connecting clamp <NUM> clamps the end of the first side wall <NUM>, it can be further locked by screws to further ensure the stability of the curtain guide rail.

Referring to <FIG>, the conveyor belt <NUM> includes a first connecting section <NUM> and a second connecting section <NUM> connected each other. The first connecting section <NUM> and the second connecting section <NUM> are connected in a head-to-tail manner. The first connecting section <NUM> is matched with the driving wheel <NUM>, the second connecting section <NUM> is wound on the first fixed pulley <NUM> and the second fixed pulley <NUM>, and the second connecting section <NUM> is also matched with the driven wheel. In an embodiment, the second connecting section <NUM> is matched with the driven wheel. In this embodiment, the belt thickness of the first connecting section <NUM> is greater than that of the second connecting section <NUM>. The belt thickness referred to in this embodiment is not limited to the thickness of the belt, so it can also refer to the diameter of the steel wire or rope.

For example, when the first connecting section <NUM> and/or the second connecting section <NUM> are flat drive belt (E. , a belt, a flat rope), the belt thickness refers to the direct thickness of the belt or flat rope, and when the first connecting section <NUM> and/or the second connecting section <NUM> are steel wire or rope with a circular section, the belt thickness refers to the diameter of the steel wire or rope.

In this embodiment, the belt thickness of the first connecting section <NUM> is greater than that of the second connecting section <NUM>, so that the first connecting section <NUM> matched with the driving wheel <NUM> is thicker, which can better drive and avoid wear. The belt thickness of the second connecting section <NUM> wound on the first fixed pulley <NUM> and the second fixed pulley <NUM> is thinner, which can save the space of the guide rail and realize more lightweight and beautiful guide rail.

Claim 1:
A telescopic curtain guide rail, comprising: an inner rail (<NUM>), an outer rail (<NUM>), and a transmission unit;
wherein the inner rail (<NUM>) is connected to a side of the outer rail (<NUM>), and the inner rail (<NUM>) is embedded in the outer rail (<NUM>) and slidable along the outer rail (<NUM>); and
wherein the transmission unit comprises a driving wheel (<NUM>), a driven wheel (<NUM>) and a conveyor belt (<NUM>), the driving wheel (<NUM>) and the driven wheel (<NUM>) are respectively located at two opposite ends of the telescopic curtain guide rail, the conveyor belt (<NUM>) is wound on the driving wheel (<NUM>) and the driven wheel (<NUM>),
characterized in that
the telescopic curtain guide rail comprises a guide sleeve (<NUM>) and said guide sleeve (<NUM>) is a hollow tubular structure with openings at both ends, and the guide sleeve (<NUM>) is sleeved outside a connection between the outer rail (<NUM>) and the inner rail (<NUM>);
and in that the transmission unit further comprises a first fixed pulley (<NUM>) and a second fixed pulley (<NUM>), and the driving wheel (<NUM>) is connected with a motor;
the first fixed pulley (<NUM>) is located at one of an inner end of the inner rail (<NUM>) and an inner end of the outer rail (<NUM>), and the second fixed pulley (<NUM>) is located at the other one of the inner end of the inner rail (<NUM>) and the inner end of the outer rail (<NUM>);
the driving wheel (<NUM>) and the first fixed pulley (<NUM>) are respectively disposed on two ends of the inner rail (<NUM>) one of which is the inner end of the inner rail (<NUM>), or respectively disposed on two ends of the outer rail (<NUM>) one of which is the inner end of the outer rail (<NUM>); and
the conveyor belt (<NUM>) is wound on the driving wheel (<NUM>), the driven wheel (<NUM>), the second fixed pulley (<NUM>) and the first fixed pulley (<NUM>);
a distance between the driven wheel (<NUM>) and the driving wheel (<NUM>) is decreased while a distance between the first fixed pulley (<NUM>) and the second fixed pulley (<NUM>) is increased, when the inner rail (<NUM>) moves towards the outer rail (<NUM>); or, the distance between the driven wheel (<NUM>) and the driving wheel (<NUM>) is increased while the distance between the first fixed pulley (<NUM>) and the second fixed pulley (<NUM>) is decreased, when the inner rail (<NUM>) moves away from the outer rail (<NUM>).