CN218457883U

CN218457883U - Double-end opening and closing curtain capable of switching between single opening and double opening

Info

Publication number: CN218457883U
Application number: CN202222013736.5U
Authority: CN
Inventors: 孙旭东; 杨恩丰; 万士强
Original assignee: Hangzhou Wistar Mechanical And Electric Technology Co ltd
Current assignee: Hangzhou Wistar Mechanical And Electric Technology Co ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2023-02-10
Anticipated expiration: 2032-07-29

Abstract

The utility model relates to a double-end just can carry out single division and two division switching's curtain that opens and shuts. It has solved current electric window curtain can not freely switch single two technical problem such as opening. The curtain rail comprises a curtain rail, wherein transmission box bodies with transmission assemblies are respectively arranged at two ends of the curtain rail, a synchronous belt body movably penetrating the curtain rail is arranged between the transmission assemblies, a driver connected with the transmission assemblies is arranged on at least one transmission box body, two sliding vehicle bodies are arranged in the curtain rail in a sliding manner, and the sliding vehicle bodies are respectively fixedly connected with the synchronous belt body through a sliding vehicle positioning mechanism so as to realize a double-opening mode; or one of the two scooter bodies is movably connected with the synchronous belt body through a double-opening single-opening switching mechanism so as to realize a single-opening mode. Has the advantages that: the installation coaster is singly opened the piece, makes the hold-in range can freely loosen with the coaster and takes off, just so can singly open and two divisions freely switch, has alleviateed the overstock stock of producer for the turnover speed of product, also satisfies user's multiple demand simultaneously.

Description

Double-end opening and closing curtain capable of switching between single opening and double opening

Technical Field

The utility model belongs to the technical field of electric window curtain equipment, concretely relates to double-end just can carry out the curtain that opens and shuts of singly opening and two divisions of switchings.

Background

The curtain is made of cloth, bamboo, reed, hemp, yarn, plastic, metal material, etc. and is hung on the window to shield or regulate indoor light. With the development of curtains, it has become an indispensable indoor decoration for a living room with perfect combination of functionality and decoration. In the traditional technology, the curtain is mostly opened and closed through manual operation, the curtain is troublesome to operate and control, and the use comfort of a user is poor. The intelligent control of curtains is an important component in the field of smart home, and in order to improve the comfort level of a user in using the curtains, electric curtains capable of electrically controlling the curtains to open and close have been introduced in the market. At present, all existing curtain needing to be opened and closed, such as an opening and closing curtain, a fantastic curtain or a Roman curtain and the like, cannot be freely switched between single opening and double opening, namely, a user needs to buy a single opening curtain or a double opening curtain when buying the curtain, a manufacturer needs to simultaneously stock 2 kinds of stocks, 1 kind of single opening curtain stocks and 1 kind of double opening curtain stocks, the stock overstock of the manufacturer is increased, and meanwhile, if the user suddenly and temporarily tries to change the opening and closing form of the curtain, the curtain needs to be bought again, and unnecessary waste is generated.

Disclosure of Invention

The utility model aims at the above problem, provide a double-end and can carry out the single division and two division switching's curtain that opens and shuts.

In order to achieve the above purpose, the utility model adopts the following technical proposal: a double-end opening curtain capable of switching between single opening and double opening comprises a curtain rail, wherein transmission boxes with transmission components are respectively arranged at two ends of the curtain rail, a synchronous belt body movably penetrating the curtain rail is arranged between the transmission components, a driver connected with the transmission components is arranged on at least one transmission box body, two trolley bodies are arranged in the curtain rail in a sliding mode, and the trolley bodies are fixedly connected with the synchronous belt body through trolley positioning mechanisms respectively so as to realize a double opening mode; or one of the two slide car bodies is fixedly connected with the synchronous belt body through the slide car positioning mechanism, and the other slide car body is movably connected with the synchronous belt body through the double-opening single-opening switching mechanism, so that the single-opening mode is realized. The opening and closing form of the curtain can be freely changed by a user by using the double-opening single-opening switching mechanism.

In the double-head retractable curtain capable of switching between single opening and double opening, the curtain rail is internally provided with two hanging wheels in a sliding manner, when the curtain rail is in a double opening mode, the two pulley bodies are respectively positioned between the two hanging wheels, and the hanging wheels are respectively arranged adjacent to the corresponding pulley bodies, or when the curtain rail is in a single opening mode, the two hanging wheels are both positioned in the two pulley bodies and are fixedly connected with the synchronous belt body and far away from one side of the rest pulley body.

In the double-head retractable curtain capable of switching between single opening and double opening, the two trolley bodies have the same shape and size or the trolley bodies have different shapes and sizes, and the lower ends of the hanging wheels are respectively provided with hanging holes extending to the outer side of the curtain rail.

In the double-end opening and closing curtain capable of switching between single opening and double opening, the pulley positioning mechanism comprises a synchronous belt positioning channel which is arranged at the upper end of the pulley body and is used for the synchronous belt body to pass through, and an upper pressing assembly capable of positioning the synchronous belt body in the synchronous belt positioning channel is arranged at the upper end of the pulley body; or, one side of the pulley body is provided with a side pressing component which can position the synchronous belt body in the synchronous belt positioning channel.

In foretell double-end just can carry out the curtain that opens and shuts that singly opens and two divisions switch, last compress tightly the subassembly uncovered including the coaster that forms in coaster body upper end, the uncovered joint of coaster have the coaster top cap, just uncovered and the coaster top cap between form above-mentioned hold-in range location passageway just hold-in range body joint between the uncovered and coaster top cap of coaster.

In foretell double-end just can carry out single division and two divisions of the curtain that opens and shuts that switch, the tight subassembly of side pressure including setting up the opening in coaster body upper end one side, be equipped with in coaster body one side and can be with opening confined coaster clamp plate, coaster clamp plate upper end extend to opening upper end inboard, and be equipped with in coaster clamp plate one side with synchronous area body assorted concave-convex structure, thereby coaster clamp plate lower extreme and coaster body detachable continuous make the coaster clamp plate be located the opening part and with the tight location of synchronous area body clamp. The synchronous belt passes through a synchronous belt positioning channel at the upper end of the pulley body and is compressed through the pulley pressing plate, the pulley pressing plate is provided with a tooth form corresponding to the synchronous belt, the synchronous belt can be compressed, and the pulley pressing plate is in a double-opening mode at the moment.

In foretell double-end just can carry out the curtain that opens and shuts that singly opens and two divisions switch, two divisions switching mechanism including the coaster installation department that forms in coaster body lower extreme one side and vertical downwardly extending set up, the coaster clamp plate be with the form of buckling that coaster body outside matches, just coaster clamp plate lower extreme extend to the positioning groove of coaster installation department one side in, keep away from coaster clamp plate one side at the coaster installation department and have thereby enable coaster clamp plate upper end break away from the coaster singly to open the subassembly that the opening made the synchronous belt body freely slide in the hold-in range constant head tank.

In foretell double-end just can carry out single division and two divisions of the curtain that opens and shuts that switch, coaster single division subassembly include single division bottom plate, single division bottom plate one side be equipped with two single division mounting panels that are located coaster installation department and keep away from coaster clamp plate one side respectively, single division bottom plate opposite side be equipped with and be located between two single division mounting panels and peg graft between coaster installation department and coaster clamp plate thereby make the coaster clamp plate break away from the single division separator of positioning groove, just single division mounting panel pass through positioning bolt and coaster installation department and link to each other. The single opening piece is inserted between the pulley body installation part and the pulley pressing plate, so that a gap is generated between the pulley body and the pulley pressing plate, the synchronous belt positioning channel at the upper end of the pulley body is in a loosening state, the synchronous belt can freely move in the synchronous belt, and the single opening mode is realized at the moment.

In foretell double-end just can carry out the curtain that opens and shuts that singly opens and two divisions switch, at least one in two smooth automobile bodies smooth automobile body lower extreme is equipped with the coaster arm that is crooked form, just coaster arm one end coaster arm mount pad has, coaster installation department and/or coaster clamp plate lower extreme peg graft and link to each other in coaster arm mount pad and through the fastener. After the pulley arm sleeve is removed, the screw is locked to fix the pulley body and the pulley pressing plate.

In the double-head opening and closing curtain capable of switching between single opening and double opening, the transmission assembly is a transmission belt wheel arranged in the transmission case body, the transmission belt wheel in one of the transmission case bodies is a driving belt wheel, the transmission belt wheel in the other transmission case body is a driven belt wheel, and the number of the drivers is one and the drivers are arranged on the transmission case body with the driving belt wheel; or the two transmission case bodies are provided with two driving belt wheels, and the two drivers are respectively arranged on each transmission case body. The specifications and the sizes of the two transmission boxes are the same, the installation directions of the motors can be selected by oneself, the drivers can be installed on the two transmission boxes, or only one driver can be installed according to the use requirements of users.

Compared with the prior art, the utility model has the advantages of:

1. the pulley single-opening assembly is switched to the single-opening mode in the double-opening mode, so that the synchronous belt can be freely loosened from the pulley, the pulley arm at the lower end of the pulley body is detached, the hanging wheel behind the pulley body is installed behind the other pulley body, the single-opening mode and the double-opening mode are switched conveniently and quickly, and various requirements of users are met.

2. The curtain uses the same track and the transmission case, and then is matched with two motors with different specifications, thereby saving the manufacturing cost of manufacturers, reducing the inventory and simplifying the package.

Drawings

Fig. 1 is a schematic diagram of the structure of the single open state in the present invention.

Fig. 2 is the structural schematic diagram of the double open state in the utility model.

Fig. 3 is a structural sectional view of the single open state of the present invention.

Fig. 4 is a structural sectional view of the double open state of the present invention.

Fig. 5 is a schematic structural view of the middle sliding vehicle body of the present invention.

Fig. 6 is a schematic structural view of another carriage body according to the present invention.

Fig. 7 is a schematic structural view of the middle pulley pressing plate of the present invention.

Fig. 8 is a schematic structural view of the middle pulley single-opening assembly of the present invention.

Fig. 9 is a schematic structural view of the transmission case of the present invention.

Fig. 10 is a partial enlarged view of a portion a in fig. 1 according to the present invention.

Fig. 11 is a partial enlarged view of the position B in fig. 2 according to the present invention.

In the figure: the curtain rail 1, the synchronous belt body 11, the synchronous belt positioning groove 111, the hanging wheel 12, the hanging hole 121, the transmission box body 2, the transmission assembly 21, the driver 22, the pulley body 3, the pulley pressing plate 31, the concave-convex structure 311, the pulley arm 32, the pulley arm mounting seat 321, the fastener 322, the pulley positioning mechanism 4, the synchronous belt positioning channel 41, the double-open single-open switching mechanism 5, the pulley mounting part 51, the positioning groove 511, the upper pressing assembly 6, the pulley opening 61, the pulley top cover 62, the side pressing assembly 7, the opening 71, the pulley single-open assembly 8, the single-open bottom plate 81, the single-open mounting plate 82, the positioning bolt 821 and the single-open separator 83.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-11, a double-ended retractable curtain capable of switching between single opening and double opening includes a curtain rail 1, wherein two ends of the curtain rail 1 are respectively provided with a transmission box 2 having a transmission component 21, a synchronous belt 11 movably disposed in the curtain rail 1 is disposed between the transmission components 21, at least one transmission box 2 is provided with a driver 22 connected with the transmission component 21, two carriage bodies 3 are slidably disposed in the curtain rail 1, and the carriage bodies 3 are respectively fixedly connected with the synchronous belt 11 through a carriage positioning mechanism 4 to realize a double opening mode; or, one of the two trolley bodies 3 is fixedly connected with the synchronous belt body 11 through the trolley positioning mechanism 4, and the other trolley body 3 is movably connected with the synchronous belt body 11 through the double-opening single-opening switching mechanism 5, so that the single-opening mode is realized. By using the double-open single-open switching mechanism 5, the user can freely change the open and close form of the curtain.

As shown in fig. 1 and fig. 2, two hanging wheels 12 are further slidably disposed in the curtain rail 1, when the curtain rail is in the double-open mode, the two pulley bodies 3 are respectively located between the two hanging wheels 12, and the hanging wheels 12 are respectively disposed adjacent to the corresponding pulley bodies 3, or, when the curtain rail is in the single-open mode, both the two hanging wheels 12 are located on the pulley body 3 fixedly connected to the synchronous belt 11 in the two pulley bodies 3 and on a side away from the remaining one pulley body 3.

As shown in fig. 2, the two carriage bodies 3 have the same shape and size or the carriage bodies 3 have different shapes and sizes, and the lower ends of the hanging wheels 12 respectively have hanging holes 121 extending to the outer side of the curtain rail 1.

Referring to C in fig. 2, in the single open mode, the carriage body 3 with the carriage single open is moved to one end, and then the hanging wheel 12 at the rear of the carriage body 3 with the carriage single open is placed at the rear of the other carriage body 3, so that the carriage can run to the bottom.

As shown in fig. 5, the pulley positioning mechanism 4 includes a synchronous belt positioning channel 41 disposed at the upper end of the pulley body 3 and through which the synchronous belt 11 passes, and an upper pressing assembly 6 capable of positioning the synchronous belt 11 in the synchronous belt positioning channel 41 is disposed at the upper end of the pulley body 3; alternatively, a side pressing unit 7 capable of positioning the timing belt body 11 in the timing belt positioning passage 41 is provided on one side of the pulley body 3.

Wherein, go up to compress tightly subassembly 6 including forming in the uncovered 61 of coaster of the coaster body 3 upper end, the uncovered 61 joint of coaster has coaster top cap 62, and forms above-mentioned hold-in range location passageway 41 and the synchronous belt body 11 joint between the uncovered 61 of coaster and coaster top cap 62 of coaster between the uncovered 61 of coaster and coaster top cap 62.

As shown in fig. 6, the side pressing assembly 7 includes an opening 71 disposed on one side of the upper end of the pulley body 3, a pulley pressing plate 31 capable of sealing the opening 71 is disposed on one side of the pulley body 3, the upper end of the pulley pressing plate 31 extends to the inner side of the upper end of the opening 71, a concave-convex structure 311 matched with the synchronous belt 11 is disposed on one side of the pulley pressing plate 31, and the lower end of the pulley pressing plate 31 is detachably connected with the pulley body 3 so that the pulley pressing plate 31 is positioned at the opening 71 to clamp and position the synchronous belt 11. The synchronous belt body 11 passes through the synchronous belt positioning channel 11 at the upper end of the pulley body 3 and is pressed tightly through the pulley pressing plate 31, the pulley pressing plate 31 is provided with a tooth form corresponding to the synchronous belt body 11, the synchronous belt body 11 can be pressed tightly, and the synchronous belt body is in a double-opening mode at the moment.

As shown in fig. 6 and 7, the double-open single-open switching mechanism 5 includes a pulley installation portion 51 formed on one side of the lower end of the pulley body 3 and vertically extending downward, the pulley pressing plate 31 is bent to match with the outer side of the pulley body 3, the lower end of the pulley pressing plate 31 extends into the positioning groove 511 on one side of the pulley installation portion 51, and a pulley single-open component 8 capable of separating the upper end of the pulley pressing plate 31 from the opening 71 to enable the synchronous belt 11 to freely slide in the synchronous belt positioning groove 111 is disposed on one side of the pulley installation portion 51 away from the pulley pressing plate 31.

Referring to fig. 3, 8 and 11, the pulley single-split assembly 8 includes a single-split base plate 81, two single-split mounting plates 82 located on one side of the pulley mounting portion 51 away from the pulley pressing plate 31 are respectively disposed on one side of the single-split base plate 81, a single-split spacer 83 located between the two single-split mounting plates 82 and inserted between the pulley mounting portion 51 and the pulley pressing plate 31 so as to separate the pulley pressing plate 31 from the positioning groove 511 is disposed on the other side of the single-split base plate 81, and the single-split mounting plates 82 are connected to the pulley mounting portion 51 through positioning bolts 821. The single opening piece is inserted between the pulley body mounting part 51 and the pulley pressing plate 31 to generate a gap between the pulley body 3 and the pulley pressing plate 31, so that the synchronous belt positioning channel 11 at the upper end of the pulley body 3 is in a loose state, the synchronous belt can freely move in the synchronous belt, and the single opening mode is realized at the moment.

Referring to fig. 4 and 10, at least one of the two carriage bodies 3 has a curved carriage arm 32 at a lower end thereof, and one end of the carriage arm 32 has a carriage arm mounting seat 321, and the lower ends of the carriage mounting portion 51 and/or the carriage press plate 31 are inserted into the carriage arm mounting seat 321 and connected to each other by a fastening member 322. After the pulley arm 32 is sleeved, the screw is locked to fix the pulley body 3 and the pulley pressing plate 31.

As shown in fig. 9, the transmission assembly 21 is a transmission belt pulley arranged in the transmission case 2, and the transmission belt pulley in one of the transmission case 2 of the two transmission cases 2 is a driving belt pulley, the transmission belt pulley in the other transmission case 2 is a driven belt pulley, and the number of the drivers 22 is one and is installed on the transmission case 2 having the driving belt pulley; alternatively, the two transmission cases 2 have driving pulleys, and the number of the drivers 22 is two and the drivers are respectively mounted on each transmission case 2. The two transmission case bodies 2 have the same specification and size, the installation direction of the driver 22 can be selected by self, the driver 22 can be installed on both the two transmission case bodies 2, or only one driver 22 can be installed according to the use requirement of a user.

The principle of the embodiment is as follows:

as shown in fig. 6 and 7, the synchronous belt 11 passes through the synchronous belt positioning channel 41 of the carriage body 3 and is pressed by the carriage pressing plate 31, the carriage pressing plate 31 has a tooth shape corresponding to the synchronous belt 11, which can press the synchronous belt 11, and then the carriage arm 32 is sleeved on and the carriage body 3 and the carriage pressing plate 31 are fixed by the fastening member 322. Then, as shown in fig. 1, the driver 22 is started, the two carriage bodies 3 close from both sides to the middle to close the curtain, and similarly, the two carriage bodies 3 close from the middle to both sides to open the curtain, thereby realizing a double-opening mode. Finally, as shown in fig. 2, one of the trolley bodies 3 is taken out of the lower trolley arm 32, the trolley unilaterally-opening assembly 8 is replaced, the trolley pressing plate 31 pressing the synchronous belt body 11 is loosened, the trolley body 3 can move freely without being controlled by the synchronous belt body 11, then the trolley body 3 is pushed aside, the hanging wheel 12 originally at the back of the trolley body 3 moves to the back of the other trolley body 3 (as shown at C in fig. 2), and thus the other trolley body 3 can run to the bottom, and the unilaterally-opening mode is realized.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms of the curtain rail 1, the timing belt body 11, the timing belt positioning groove 111, the hanging wheel 12, the hanging hole 121, the transmission case 2, the transmission assembly 21, the driver 22, the pulley body 3, the pulley pressing plate 31, the concave-convex structure 311, the pulley arm 32, the pulley arm mounting seat 321, the fastener 322, the pulley positioning mechanism 4, the timing belt positioning passage 41, the double-open single-open switching mechanism 5, the pulley mounting portion 51, the positioning groove 511, the upper pressing assembly 6, the pulley opening 61, the pulley top cover 62, the side pressing assembly 7, the opening 71, the pulley single-open assembly 8, the single-open bottom plate 81, the single-open mounting plate 82, the positioning bolt 821, the single-open spacer 83, etc., are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The double-end opening and closing curtain capable of achieving single opening and double opening switching comprises a curtain rail (1), wherein transmission boxes (2) with transmission assemblies (21) are respectively arranged at two ends of the curtain rail (1), a synchronous belt body (11) movably penetrating and arranged in the curtain rail (1) is arranged between the transmission assemblies (21), and a driver (22) connected with the transmission assemblies (21) is arranged on at least one transmission box body (2), and is characterized in that two pulley bodies (3) are arranged in the curtain rail (1) in a sliding manner, and the pulley bodies (3) are respectively fixedly connected with the synchronous belt body (11) through pulley positioning mechanisms (4) to achieve a double opening mode; or one of the two sliding vehicle bodies (3) is fixedly connected with the synchronous belt body (11) through the sliding vehicle positioning mechanism (4) and the rest sliding vehicle body (3) is movably connected with the synchronous belt body (11) through the double-opening single-opening switching mechanism (5) so as to realize the single-opening mode.

2. The curtain as claimed in claim 1, wherein the curtain rail (1) is further slidably provided with two hanging wheels (12), when in the double-open mode, the two sliding bodies (3) are respectively located between the two hanging wheels (12) and the hanging wheels (12) are respectively adjacent to the corresponding sliding bodies (3), or, when in the single-open mode, the two hanging wheels (12) are both located on the sliding body (3) of the two sliding bodies (3) fixedly connected to the synchronous belt body (11) and away from one side of the remaining sliding body (3).

3. The curtain as claimed in claim 2, wherein the two carriages (3) have the same shape and size or the carriages (3) have different shapes and sizes, and the hanging wheel (12) has a hanging hole (121) at its lower end extending to the outer side of the curtain rail (1).

4. The curtain capable of opening and closing with double heads and capable of switching between single opening and double opening according to claim 1, 2 or 3, wherein the pulley positioning mechanism (4) comprises a synchronous belt positioning channel (41) arranged at the upper end of the pulley body (3) and for the synchronous belt body (11) to pass through, and the upper end of the pulley body (3) is provided with an upper pressing assembly (6) capable of positioning the synchronous belt body (11) in the synchronous belt positioning channel (41); or, one side of the pulley body (3) is provided with a side pressing component (7) which can position the synchronous belt body (11) in the synchronous belt positioning channel (41).

5. The curtain that opens and shuts that just can carry out single division and two divisions of switching of claim 4, characterized in that, last compress tightly subassembly (6) including form the pulley uncovered (61) of coaster body (3) upper end, pulley uncovered (61) joint have a pulley top cap (62), and pulley uncovered (61) and pulley top cap (62) between form above-mentioned hold-in range location passageway (41) and the hold-in range body (11) joint between pulley uncovered (61) and pulley top cap (62).

6. The curtain that opens and shuts that just can carry out single division and two divisions of switching of claim 4, characterized in that, side pressure subassembly (7) including set up opening (71) in coaster body (3) upper end one side, be equipped with on coaster body (3) one side and can be with opening (71) confined coaster clamp plate (31), coaster clamp plate (31) upper end extend to opening (71) upper end inboard, and be equipped with unsmooth structure (311) with synchronous area body (11) assorted on coaster clamp plate (31) one side, coaster clamp plate (31) lower extreme and coaster body (3) detachable linking thereby make coaster clamp plate (31) be located opening (71) department and press from both sides tight location with synchronous area body (11).

7. The curtain that opens and shuts that the double-end just can carry out single division and two divisions of switching according to claim 6, characterized in that, two divisions of switching mechanism (5) including form in coaster body (3) lower extreme one side and vertical downwardly extending setting coaster installation department (51), coaster clamp plate (31) be with coaster body (3) outside assorted bending form, and coaster clamp plate (31) lower extreme extend to in the positioning groove (511) of coaster installation department (51) one side, keep away from coaster clamp plate (31) one side at coaster installation department (51) and have the pulley single division subassembly (8) that can make coaster clamp plate (31) upper end break away from opening (71) thereby make the synchronous belt body (11) freely slide in synchronous belt constant head tank (111).

8. The double-end curtain that opens and shuts that just can carry out single division and two divisions of switchings of claim 7, characterized in that coaster single division subassembly (8) include single division bottom plate (81), single division bottom plate (81) one side be equipped with two single division mounting panels (82) that are located coaster installation department (51) and keep away from coaster clamp plate (31) one side respectively, single division bottom plate (81) other side be equipped with and be located between two single division mounting panels (82) and peg graft between coaster installation department (51) and coaster clamp plate (31) thereby make coaster clamp plate (31) break away from single division (83) of positioning groove (511), just single division mounting panel (82) link to each other through positioning bolt (821) and coaster installation department (51).

9. The curtain that opens and shuts that just can singly open and can two divisions of switches according to claim 7, characterized by, at least one smooth automobile body (3) lower extreme in two smooth automobile bodies (3) is equipped with the coaster arm (32) that is curved form, just coaster arm (32) one end coaster arm mount pad (321) have, coaster installation department (51) and/or coaster clamp plate (31) lower extreme peg graft in coaster arm mount pad (321) and link to each other through fastener (322).

10. The curtain of claim 1, wherein the driving component (21) is a driving pulley disposed in the transmission housing (2), and the driving pulley in one of the transmission housings (2) is a driving pulley, the driving pulley in the other transmission housing (2) is a driven pulley, and the number of the drivers (22) is one and is mounted on the transmission housing (2) having the driving pulley; or the transmission belt wheels in the two transmission case bodies (2) are driving belt wheels, and the number of the drivers (22) is two and the drivers are respectively arranged on the transmission case bodies (2).