TWM244362U - Transmission mechanism of curtain - Google Patents

Description

M244362 ------- Creation instructions (1) [Technical skills This creation includes _ curtain brakes. The two-way table poles of curtain rods are closely connected as a whole, and the substantial benefits of simplicity and convenience are brought about by the action of rope. [Previous press, please refer to the hinge shaft and the first end of the curtain-drawing rope labor-saving rewinding device; a rotating shaft, two of the bearing bases, the rotating shaft generates a positive end, and the other end passes through forward and reverse rotation to help the However, under the application of Dong Ziji, 01. The driving domain] The drive structure of a curtain, the drive structure is a package and a winder, the curtain brake is directly placed and the tight end, and its pull The rope is set on one side, and it is combined with the curtain of the two sets of curtains to form a seamless gap with the next combination. It can also be used in combination with the curtain winder. The inner winding line is used as the lifting and retracting operator, so that the product can be used.] See the unfolding and winding device in Annex 1. The new structure includes a two-axis pivot system as a shaft pivot, and the rope is reversed to rotate the coil. The reel rotates the above-mentioned window. Although there are mechanisms such as: one, a long tube can be rotated; connected / rearwarded after the hole; the tension curtain of the retracting rope is installed slightly under the type 9 patent case shown Seat, Holes bifurcation body, the turn rotates, - a pull cord connected to the load at more revolutions along a vehicle aid. The missing part of the labor-saving wind curtain is inside the curtain rod. 02 1 'The two ends of the curtain rod are fixed to the two ends of the carriage by the driver', and the 'is smooth. Structure, using the pull rope to receive No. 2 "rope-saving, a first bottom surface, a light connection to the device that drives the bottom of the curtain to provide a deflection force to the drive mechanism to obtain the structure of the drive mechanism and its value Fourth, the creation description (2) the structure of the forward or reverse action mechanism connected to the ^ wheel, is set from the outside of the window 麄 # t and pull, f fold end, so its runner: Bu side pivot on the drive Turning up is more troublesome: and the drive mechanism has 2 See the curtain rod 2. The drive 4 = 丄, the prepared components are full in the installation steps: and ::: Cheng Zhuan Xuan type and the connection between the runner, It is the use of the load of group 1 ί 7 $. Because the transfer of thirsty wheels and thirsty rods = ... '4 mesh is limited to what can be applied, it cannot be carried longer and the window display form is also narrower. Baibi3 · For the above, the inner side of the rope winding pivot joint is placed on a longer auxiliary, and a joint is fixed at one end of the shaft. A convex post is set up to be plugged on a shaft of a cow, and the other end of the auxiliary component is equipped with a technical composition of the seat, and the shaft is pivoted on the bearing to cause the assembly operation to be difficult, and the cost is high, and It has many components. 4. Pairs of iron rolls 2: = ,. Therefore, when the rope is stretched for a long time & > & The surface of the shaft is formed as a smooth surface " Sliding on the shaft or jade 5 caused resistance and non-smoothness of the curtain winding operation due to $. Due to the difficult setting of the negative households η, p, it is very hot for the Hungarian Plain: the use of its auxiliary components is prone to elastic fatigue, resulting in curtain 棬 f > ° For the above 9 0 2 1 2 7 〇2 "Curtain Pulling rope for labor-saving rewinding • The second drive mechanism adopts the turning of the turbine and the vortex rod, so the necessary components must be installed in its winding setting (and in the shaft, not only * 7 drive mechanism has The curtains of suitable size are restricted, and their elastic load bearing is concentrated on the setting of the winding line. As a result, after the curtain is used for a period of time, the malaria auxiliary device is prone to elastic fatigue, which causes the curtain to be unpleasant.

M244362

" II ㈡ 、 Creation of Creation (3) --- —__ Device "In the case of the technology disclosed, although its driving mechanism can be soiled, it can be combined with the next group of curtain rods to form a stuffing pan into the pan. When the two sets of curtains in the curtain rod are combined to form a seamless close-density type curtain, the application of the structure is still lacking to achieve the second state of practical benefits. However, for the products, please refer to the second disclosure: By. The improved structure of the hinges of the jalousie curtains. The new type No. 205 4 No. 1 factory system includes a body group, which consists of two shafts, coil springs, bushings and a body. B. The cover is composed of a winding rope seat group of the machine and the rotor seat. A rotor has a rotor to further control the lifting and lowering of the blinds. The body part group 4 〆 and the turning angle of the tooth blades are used for the rotation of the blinds described later. The structure of the tie belt directly connected with the shaft is improved, and the group implements lifting, collapsing, and one-way-type two: using mechanical rotation, the body group is installed on the curtain rod toward the angle η weaving seat ^ rod-end The side c is erected on the outside to combine the machine: sub ::: = when the window leaf and the space between the two sets of jalousie are merged; the gap is larger; for this reason, the creator of this book has " It is difficult to achieve 4 applications. There are many shortcomings in the application and the type of curtain. There are many innovators and innovative windows. Therefore, the R & D and design of the product has more powerful design space and wider width. ^ The transmission structure came out, so that 1 does not —______ ^ and has multifunctional use benefits M2443 62 4. Creation instructions, the service period can be [internally created curtains made of curtain rods curtain rods curtain rod connection as a curtain brake winding line for simple use] [there is a method [combined with the drawing to first design the curtain curtain side The second part is 11), and the component will be the second space (1 (111 (4) to achieve capacity). As the best substantial benefit of the transmission structure product that provides an actuator and a winding curtain, it is a compact iaA body. And the quality and effect of the construction of the structure is particularly clear, and the transfer of braking includes the convenience of the semi-ranking and the extension of the body at the same time, the benefit of the convenience. Style] creative design] and a kind of curtains, draw rope, It can be equipped with this window to control the lifting and collecting of the curtains. The reference numbers of the drawings can be seen together with the first moving structure (1 has:, to this), the body (1-accommodation space (not equipped with corresponding The (1 1) lock) is formed with a transmission structure with a joint hole (the transmission structure is such that the curtain brake is directly placed and closely set on one side, and is in contact with the next group or more. Curtain formation The combination and application of the seamless curtain cord winder, when the window curtain is used as the steering angle and the operator can be placed inside it to achieve the transmission structure of the product, the technical purpose and effect of the adopted technology are specifically implemented. For example, the details are as follows: ': i ί: picture shown' * The dynamic structure based on which the creation is based includes: installation of one of the curtain rods (2) hidden); the two bodies (1 1) correspond to 1 1 ) And the second accommodating space (work 13), can be screwed together to form a unit, and the first Qiao (1 mountain), this receiving work (2), and the pivot hole (1

$ 8 pages M244362 Fourth, the creation instructions (5) 1 1 2) have convex columns (1 1 1 3) on the opposite side of the vertical direction, and correspond to the receiving section (1 1 1) to the first accommodation space (1 1 1) One end of the pivot hole (1 1 1 2) of 1 1 1) is provided with a recessed hole (1 1 1 4), and the other end forms a recessed hole (1 1 1 5). The recessed hole (1 1 1 5) ) Is provided with a limiting slot (1 1 1 6), and the receiving portion (1 1 1 1) to the recessed hole (1 1 1 4) and the receiving portion (1 1 1 1) to the recessed hole (1 1 1 5) are formed between the rope receiving wheels (1 2) to accommodate the area therebetween; the outer side of the second accommodation space (1 1 1) corresponds to the first accommodation space (1 1 1) The center of the embedded hole (1 1 1 4) is provided with a perforation (1 1 1 7). A central shaft (1 2), the cross section of which is formed into a square shape, and one end of the central shaft (12) corresponds to the orientation of the embedded hole (1114) of the body (11) and the pivot hole (1 1 1 2). Each is provided with a pivot (1 2 1), (12 2), and the other end is extended with a section (1 2 3); a first drawstring sleeve (13), which has a square hollow shaft hole (1 3 1) In order to restrict the positioning for the central shaft (1 2) to pass through, the outer side of the first pull rope sleeve (1 2) is provided with one end of the bead chain pull rope, and the first pull rope sleeve (1 2) is a second pull rope sleeve (14) which is placed in the two bodies (1 1) correspondingly in the area between the receiving portion (1 1 1 1) and the inlay hole (1 1 1 4), and has a hollow The shaft hole (141) is for the central shaft (1 2) to pass through. The outside of the shaft hole (141) is provided with a bead chain pull rope at the other end, and the second pull rope sleeve (14) is provided at both ends. The socket sections (1 4 2) are respectively embedded in the pivot joints provided in the two bodies (1 1).

Page 9 M244362 IV. Creation instructions (6) The holes (1 1 1 2) and the recessed holes (1 1 1 5) are placed in the two bodies (1 1) correspondingly in the receiving section (1 1 1 1) The area between the recessed hole (1 1 1 5); a limit sleeve shaft (15) is a hollow shaft body, and two sides of one end each correspond to two bodies (1 1) and the recessed hole (1 1 1 5) The limiting channel (1 1 1 6) has a limiting protrusion (1 5 1) in the direction for the central shaft (1 2) to pass through, and the setting is located in the concave stage hole of the two bodies (1 1). (1 1 1 5); and the limiting sleeve shaft (1 5) is fitted with two torsion springs (1 5 2) to be positioned on it, and the two torsion springs (1 5 2) have protruding sections at both ends thereof. When staggered outwards, when one end is subjected to inward 0 pressure, it can generate energy until both ends recover and release the elastic force-a drive sleeve shaft (16), forming a notch (161) on one side, On the inside, two torsion springs (1 5) and a hollow accommodation portion (162) for receiving the two torsion springs (15) and the other end of the limit sleeve shaft (14) are formed in sequence. The rear side of this hollow accommodation portion (16 2) A through hole (1 6 3) is provided at the end. (1 6 3) has a square cross-section and is positioned in close cooperation with the central shaft (1 2); a rotating shaft (17) with a hollow portion (171) is provided for receiving the drive sleeve shaft (16); It is pivotally positioned, and one side of the hollow part (171) corresponds to the slot (1 6 1) of the driving sleeve shaft (1 6). The protruding resisting portion (1 7 2) is provided for the driving sleeve shaft (1 6). ) Is driven to rotate; a gear portion (173) extends from the other end of the rotating shaft (17); a planetary gear set (18) (as shown in the second figure), including a certain

Page 10 M244362 4. Creation instructions (7) Position cover (181), the positioning cover (181) has a middle hole (1811) and a middle hole (1811) for the shaft (1 7) gear part (173) to be embedded. There are pivot holes (1812) around, positioning cover (18 1) has embedded holes (1813) and recessed notches (1814) on the outer periphery, and a positioning seat (1 8 2), the positioning seat (1 8 2) corresponds to the positioning cover The azimuth between the pivot hole (1812) and the inlay hole (1813) of the (181) and the recessed notch (1 8 1 4) has a protruding post (1 8 2 1), a snap welding (1 822), and the positioning seat ( The other end of 182) has a paragraph part (1 8 2 3), and the paragraph part (1 8 2 3) has a square hole (1 8 2 4) for fixing one end of the necessary support shaft in the curtain brake (1) Connection and counting gear (183), the gear (183) is sleeved and pivotally connected to the projection (1821) of the positioning base (182); the positioning cover (1 8 1) is provided with a pivot hole (1 8) 2 2) and the embedded hole (1 813) to the concave notch (1814) and the positioning base (182) are pivotally provided with a number of gears (183), a protruding column (1821), and a clamp welding (182 2) to form a tight combination. It can be used to control the speed of the rope and the curtain system The reduction gear transmission of the supporting shaft force distance in the gear (1); and after the positioning cover (1 8 1) and the number gear (1 8 3) and the positioning base C 1 8 2), a set of covers can be matched. (1 8 4) The outer closed protection group is set on the two combined bodies, and the planetary gear set (1 8) can be composed of one or more consecutive connections according to the length of the curtain rod (2); A roller (1 9) is provided with a post (1 1 1 3) pivotally connected to a body (1 1), and a single pull rope can be used to run along the end

M244362 IV. Creation instructions (8) Above the first drawstring wheel (1 2), below the travelling roller (1 9), and drawn from below the roller (1 9) along the second drawstring wheel (1 3), A single pull rope is distinguished by two ends, which is convenient for a pull implement. A guide base (1 0) is provided with a perforation (101) and is provided with a protruding post (1113) located on a body (1 1) of the body. The wheels (1 2) and the second pull rope sleeve (1 3) are provided with ramps (1 0 2), so that the pull rope can be guided out of the curtain rod (2) and on the guide seat (1 0). ) Has a recessed portion (1 0 3) toward the outside of the curtain rod (2); further, please refer to the fourth, fifth, and sixth figures, and the body (1 1), Central shaft (1 2), first rope-sleeve-wheel (1 2), second rope-sleeve sleeve (1 3), limit sleeve shaft (1 4), torsion spring (15), drive sleeve shaft ( 16) Curtain brake (1) composed of rotating shaft (17), planetary gear set (1 8), roller (1 9), guide seat (1 0), etc., can be hidden into the curtain rod (2) On the inner side of one end, the required pull rope is provided with a roller (1 9), which is divided into two ends by the positions of the first pull rope sleeve (12) and the second pull rope sleeve (1 3) and along the guide. The ramps (102) on both sides of the seat (10) pass out of the curtain rod (2). The curtain rod (2) is provided with a through hole (repair 21) corresponding to the azimuth of the guide base (1 0). The through hole (21) is a closed cover provided with a cover plate (22), and the cover plate (2) 2 2) The perforation (1 0 1), ramp (102) and recess (103) corresponding to the guide seat (1 0) are provided with through holes (2 2 1) and protruding sections (2 2 2), stages Holes (2 2 3),

Page 12 M244362, Creative Instructions (9) Locking the brake (1) of the components of the stage hole (2 and the guide seat (construction receiving section (1 1 1 8)) as the steering angle author, In addition, if the device (1) can be hidden in the curtain rod) and fit into a frame rod (2), the curtain rod of the size 23) can be inserted into 0 by a screw element (224) from now on. The convex column (1 1 3) on the half-shaped body (1 1) is provided with a hole (1 1 3) inside the work (the work is integrated, that is, the curtain of the curtain, which is one of the drive structure of the curtain), and by The curtain brakes (i) each have a streamlined combination relationship, which enables the pulling rope to control the curtain and the lifting and retracting of its inner winding line as a shortcut and a toilet brake to the practical benefits of the use of the product. As shown in the figure and the eighth figure, according to the different widths of the curtain rods (2) of the entire group of curtain brakes, and directly in Y2 alone, it can also be based on larger curtain rods (2 seats (3)). Used as a second covering and hidden in the curtain so that the curtain brake (1) can be applied to various specifications (2) to achieve real effectiveness and convenience For practical functions, a coil of wire ^ ^^^, Γ (4) [as shown in the ninth to twelfth pictures], the coiled line (4) is composed of: the holder (4 1, domain (J The receiving seat (41) has an accommodation area .. ,,,, One end of the Izakaya area (411) has a pivot hole (4 丄 11), and another mountain, .., 0, and form a recessed groove. (4112), recessed groove (..._ recessed rails (4113) are provided on both sides, and recessed rails (41 form a notch (4114)), which are at the upper right of the recessed groove (411), and in the accommodation area ( 411) There is a bottom section (4: [16) ·

Page 13 M244362 M244362

), With hollow holes (4 holes (4 2 3), 2 on both sides) to form a slider (4 2 41) lacking grooves (411 IV, creation instructions (10), a slide seat (4 2 (422) and long) The recessed groove (4 1 1 4) corresponds to the receiving seat ((4 2 5); the surface-shaped groove of the four-ring (4 reel shaft (4 3)) (432), and the perforation (43 3) 21) at one end of the reel has a concave ring corresponding to the seat (4 1 4), the slider (4 2 4) is provided with a convex #), and one end corresponds to the sliding In the seat (4 2), 22) forms a convex ring (431), which can be used for neat winding of the rope. ^ (4 3) Inside is provided with a rope green and an outer shaft cylinder (44). Dangu 1 The outer side of the shaft " 3) is covered with: covering: hollow coil drum (44) of the earth winding rope, one end corresponding to the receiving seat: ^ 4 4 1), and the outer 11) has a pivot joint (4 42 ) One end of the pivot hole (41) pivot hole (4111) is embedded in the pivot, ^ two ends and the seat (41 (41) bottom support section (41 16). The end is abutted against the seat by The above is provided by the receiving seat (41), the hollow shaft (4 3), the outer shaft cylinder (4 4 = ^ 4 2), and the winding reel (4). The arrangement of the neatly rolled and neatly structured rope makes the rope not a very good function setting during the operation of the curtains, and the smooth and convenient use of the winder (4) can be achieved. Based on the curtain brake and the transmission mechanism of this creation, the curtain is composed of curtain brake (i) wire and is composed of curtains, so that it is installed at the combination end of the curtain rod (2) and the simplified component— New curtain rod M244362, creation instruction (U) 2) can be closely connected, so that the connection of the curtain gaps of the two or more groups can be integrated, and the shape of each component is not strictly matched with the curtain roll. The combination of the device, the use of a pull rope, and the use of the 'and the film as the steering angle and can be hidden inside the roll of green, you _ & pieces to control the curtain ^ ^ a convenient and convenient lifting and retracting operator '俾 Make the curtain's transmission structure achieve substantial benefits in use.

In summary, 'This creative embodiment can indeed achieve the expected use effect, and the specific structure disclosed has not only been seen in similar products, nor has it been disclosed before the application. It has fully complied with the provisions of the Patent Law. In accordance with the law, the application for a new type of patent was submitted in accordance with the law, and I begged to examine it and grant the patent.

-Page 15 M244362 Brief description of the drawings [Schematic description of the first, second, third, fourth, fifth, sixth, seventh, seventh, seventh, seventh, tenth, tenth, and tenth illustrations. The original diagram of the curtain brake is a three-dimensional exploded view of the planetary gear, and the three-dimensional appearance of the curtain brake is exploded. The curtain brake made by the side view sectional view of the curtain brake, the front sectional view of the curtain brake, the rear view of the curtain brake, and the structure of the curtain brake and the large curtain rod. Schematic diagram of the appearance of the thread reel of the drawing: a cross-sectional view of the front end of the thread reel of the creation: a bottom cross-sectional view of the thread reel of the creation [refer to the annex] Annex 1: an application [refer to the drawing <this (1) (11) ( 112 (111 II: Application number] Creative part &gt; Curtain body) Second capacity 1) Accepting department number 90212702 Announcement copy number 90 2 0 54 1 1 Announcement photocopy actuator (2) curtain rod (111) of the first space accommodating space (113) holes (1112) pivot hole

Page 16 M244362 Brief description of the diagram (1 1 1 3) Post (1 1 1 4) Back hole (1 1 1 5) Recessed hole (1 1 1 6) Limit channel (1 1 1 7) Perforation (1 1 1 8) Hole (1 2) Central shaft (1 2 1) Pivot (1 2 2) Pivot (1 2 3) Section section (1 3) First drawstring sleeve (1 3 1) Hollow shaft hole (1 4) Second pull rope sleeve (1 4 1) Socket section (1 5) Limit sleeve shaft (1 5 1) Limit protrusion (1 5 2) Torsion spring (1 6 1) Notch (1 6 2) Hollow receiving part (1 6 3) Through hole (1 7) Rotating shaft (1 7 1) Hollow part (1 7 2) Protruding resisting part (1 7 3) Gear part (1 8) Planet Gear set (1 8 1) Positioning cover (1 8 1 1) Middle hole (1 8 1 2) Pivot hole (1 8 1 3) Desire hole (1 8 1 4) Concave notch (1 8 2) Positioning seat ( 1 8 2 1) Stud (1 8 2 2) Clamp (1 8 2 3) Paragraph (1 8 2 4) Square hole (1 8 3) Gear (1 8 4) Cover (1 9) Roller ( 1 0) Guide base (1 0 1) Perforation (1 0 2) Ramp (1 0 3) Recess (2 1) Through hole (2 2) Cover plate (2 2 1) Through hole (2 2 2) protruding section (2 2 3) stage hole (2 2 4) screw element M244362 simple illustration of the diagram (3) frame base (41) receiving base (4 1 1 1) pivot hole (4 1 1 3) Concave track (4 1 1 5) Perforated (42) Slide (422) Concave ring (424) Slider (43) Winding hollow shaft (4 3 2) Continuous groove (44) Outer shaft barrel (442 ) Pivot N) / 2 4 6 NM / \ J / ΝΪ / Niy N) / IX IX IX IX IX 00 LO IX 00 IX xly IX IX IX IX oo 00A- 44444444444 Γ \ Γν Γν Γν / IV / IV / IV r \ ^ cv / l \ The reel receiving area is recessed, the slot is the bottom of the slot, the bottom is the hollow hole, the elongated hole is a convex part, the convex ring is a perforated container.

Page 18

Claims (1)

M244362 Fifth, the window formed by the patent application has the opposite position: the pivoting stage is formed on the opposite side of the screw, and the stage is the second stage. The second stage contains the transmission structure of the perforated curtain. This bearing has a protruding end with a limiting channel for pulling the outside counterpart. It is installed hidden in the window side. It includes a curtain system, in which the curtain brake is in half and the second one will be installed in two. One of the outer side holes has a space between the two; and the two are positioned as parts, and are opposite to the holes. In addition, the first volume of the rope wheel includes a body separately provided with a pivot. Connected to the first end, the receiving portion accommodates the screw holes of each segment of the housing space actuator. The first side corresponds to the corresponding side of the recessed stage hole of the pivot space and the receiver area hole, and the corresponding side of the coil reel. The first enemy of the hole and the accommodation formed into the inset has the first capacity. The accommodation space hole can be a vertical hole of the receiving part, and the concave part is concave; One end of a central shaft extending, square cross-sectional shape is formed, and to be fitted to the central axis of the body bore, and among the pivoting hole extending pivot bearing are each provided with a passage portion; A first drawstring sleeve has a square hollow shaft hole for restricting the positioning for the central shaft to penetrate through. The outer side of the first drawstring sleeve is provided with a bead chain drawstring end therebetween, and the The first rope puller is placed in the area between the two bodies corresponding to the receiving portion to the recessed hole. A second rope puller has a hollow shaft hole for the central shaft to pass through. The other end of the bead-chain pull rope is set in between, and the two ends of the second pull rope sleeve are provided with socket sections, which are respectively inserted into the pivot holes provided in the two bodies. Page 19 M244362 V. Patent application scope A roller is provided with a post position pivotally connected to one of its bodies, so that one end of the drawstring runs along the top of the first drawstring sleeve and runs along the bottom of the roller. It leads out from the upper part of the second pulling rope sleeve, so that the pulling rope is divided into two ends, which is convenient for pulling the implement; a guide seat is installed to set the position of the convex post on one of the body and is provided with a perforation. The sides are provided with ramps corresponding to the directions of the first and second rope sheaves, so that the ropes are guided to the outside of the curtain rod, and the guide seat has a recessed portion toward the outside of the curtain rod; and, a The thread reel includes: a receiving seat, the receiving seat has an accommodating area, one end of the accommodating area has a pivot hole, and the other end forms a recessed groove; recessed tracks are provided on both sides of the recessed groove, A notch is formed at the upper end of the road, and a perforation is formed in the recessed groove, and a bottom rest section is provided on the accommodation area; a slide seat, which has a hollow ring and an elongated hole in the hollow hole, and the two sides correspond to the receiving recess. The slider is formed into the groove, and the slider is provided with a convex portion corresponding to the direction of the lack of the receiving seat. ; A coiled hollow shaft, one end of which corresponds to the concave ring of the hollow hole of the slide seat to form a convex ring. The surface of the coiled shaft is formed with a continuous groove for neat winding of the rope, and a cord is provided on the inside of the spool. A perforation pierced at one end; an outer shaft cylinder having a container that can cover the outside of a hollow shaft that has been wound with a cord, and a pivot hole at one end of the outer shaft cylinder corresponding to one of the receiving seats has a pivot connection Part, so that one end is pivoted with the pivot hole of the receiving seat, and the other end abuts on the bottom section of the receiving seat; it is composed of the above-mentioned components and is hidden inside one end of the curtain rod, Page 21 M244362 5. The scope of the patent application requires a roller to be self-pivoted, and is divided into two ends by the positions of the first and exhausted sets of wheels, along the sides of the guide seat, 2 and the outside of the 2nd pole, and the curtains correspond to The azimuth of the guide seat is provided with a penetrating: slope 2 out of the window: closed-the cover plate is provided as a closed cover 'the corresponding guide seat d on the cover plate;-the screwing element passes through and is guided = will = to the stage hole According to this, the curtain brake can be pulled two ;: two to: lock '-body as the steering angle and can be used to control the curtains, so as to achieve the product using J ff convenient lifting Put the operation 2. If you ask, the patent scope is 22nd profit. The curtain brake can be described in accordance with the transmission structure of the curtain, in which the cover of the frame seat is hidden in different widths of I, which can be matched with a curtain rod suitable for various specifications to dry the curtain.