TW201839248A - Covering for an architectural opening having nested rollers - Google Patents

Abstract

A covering for an architectural covering is provided. The covering may include a rotatable outer roller, a rotatable inner roller, a first shade secured to the outer roller, and a second shade secured to the inner roller. The outer roller may define an elongated slot extending along a length of the outer roller and opening to an interior of the outer roller. The inner roller may be received within the outer roller and may define a central longitudinal axis. The first shade may be retractable onto and extendable from the outer roller. The second shade may extend through the elongated slot and may be retractable onto and extendable from the inner roller. The elongated slot may be substantially horizontally aligned with the central longitudinal axis of the inner roller when the first shade is in a fully extended position.

Description

Covering with nested rollers for a building opening

The invention relates generally to coverings for building openings, and more particularly to an apparatus and method for operating a covering with nested rollers for a building opening.

Over the years, coverings for building openings such as windows, doors, arches, and the like have taken many forms. Some covers include a retractable shade that is movable between an extended position and a retracted position. In the extended position, the shade of the cover can be positioned across the opening. In the retracted position, the shade of the cover may be positioned adjacent to one or more sides of the opening. Certain coverings allow light to pass through the material constructing the covering when in the fully extended position. In certain instances, even when the cover has operable blades that open and close to control the amount of light passing through the cover, a greater amount of darkening is desired. Additionally or alternatively, in some instances a user may desire a different pattern or appearance of the cover when in the fully extended position. Usually, these goals are achieved by positioning a separate roller behind the main roller for individual actuation by the user. These separate rollers used to supplement functions or appearance increase the size of the head rails, and may require the use of a second set of control ropes and operating mechanisms, thus increasing the size and weight of the cover structure.

An example of the invention may include a covering with nested rollers for a building opening. In some examples, the covering may include: a rotatable outer roller defining an elongated groove extending along a length of the outer roller and leading to an interior of the outer roller; a rotatable inner roller, which Received in the outer roller and defining a central longitudinal axis; a first shade that is fixed to the outer roller; the first shade is retractable to the outer roller and extends from the outer roller; and a first Two light-shielding objects are fixed to the inner roller, wherein the second light-shielding object extends through the extension groove and is retractable to the inner roller and extends from the inner roller. When the first shade is in a fully extended position, the elongated groove may be substantially horizontally aligned with the central longitudinal axis of the inner roller. In some examples, the inner roller and the outer roller are concentric about a central longitudinal axis of the inner roller. In some examples, the first shade and the second shade have the same width. In some examples, the width of the first shade is extended along the entire length of the outer roller, and the width of the second shade is extended along the entire length of the inner roller. In some examples, the slot is oriented orthogonally to an extending direction of the first shade. In some examples, the cover includes a bottom rail fixed to the second shade and engaging the outer roller when the second shade is in a fully retracted position. In some examples, the outer roller defines a longitudinal seat formed along the slot, and the bottom rail is received in the seat when the second shade is in the fully retracted position. In some examples, the covering includes a mounting system that supports the inner roller and the outer roller for rotational movement about the central longitudinal axis of the inner roller. In some examples, the cover includes an operating mechanism for selectively rotating the inner roller. In some examples, the outer roller includes a first casing and a second casing each having a longitudinally extending end edge, and the edges of the first casing and the second casing are spaced apart from each other along the periphery. Open to define the elongated groove. In some examples, the covering includes: a first sleeve locked into one end of the first casing and the second casing; and a second sleeve locked to the first casing And an opposite end of the second casing; wherein the first sleeve and the second sleeve maintain a constant width of the groove. In some examples, the covering includes a lock mechanism that is movable between a first position that restricts rotation of the outer roller and a second position that permits rotation of the outer roller. In some examples, the lock mechanism is moved from the first position to the second position immediately after the bottom rail is engaged with the lock mechanism. In some examples, the outer roller defines an elongated groove formed in the side wall, the lock mechanism includes a bearing, and in the first position of the lock mechanism, the bearing is received in the groove. In some examples, the lock mechanism includes a pin, and the lock mechanism is actuated immediately after the pin is engaged by the bottom rail to remove the bearing from the groove. In some examples, the bearing removably engages the outer surface of the outer roller in the second position. In some examples, the lock mechanism includes a locking member that pivots between the first position and the second position. In some examples, the lock mechanism includes a locking member that is axially translated between the first position and the second position. In some examples, the lock mechanism includes a rotatable shaft member positioned outside the outer roller and oriented substantially parallel to the central longitudinal axis of the inner roller. In some examples, the cover includes an end cap, the inner roller and the outer roller are rotatably coupled to the end cap, the lock mechanism includes a housing overhanging from the end cap, and the rotatable shaft member shaft The neck is supported to the shell. In some examples, the lock mechanism includes a gear mechanism coupling the rotation of the rotatable shaft and the outer roller. In some examples, the cover may include: a rotatable outer roller that defines an elongated groove; a first shade that is fixed to the outer roller and can be wound around the outer roller; a lock mechanism that Positioned on the outside of the outer roller and at least partially defining a bottom stop of the first shade; a rotatable inner roller received in the outer roller; a second shade that is fixed to the inner roller and Can be wound on the inner roller, the second shade is extendable and retractable through the elongation groove; and a non-rotatable shaft member extends inside the inner roller and at least partially defines the second shade A bottom stop. In some examples, the lock mechanism includes: a rotatable shaft member positioned outside the outer roller; and a locking member that translates axially along the rotatable shaft member. In some examples, the lock mechanism includes a pivotable locking member positioned outside the outer roller. An example of the invention may include a method of operating a covering for a building opening. In some examples, the method includes: unfolding a first shade from a periphery of an outer roller; and after the first shade reaches a fully extended position, it immediately positions itself on one of an inner roller in the outer roller A second shading object is unfolded at the periphery, wherein unfolding the second shading object includes extending the second shading object through one formed in the outer roller and positioned substantially horizontally aligned with a central longitudinal axis of the inner roller Extension groove. In some examples, the method includes: pivoting a locking member into locking engagement with the outer roller to lock rotation of the outer roller; rotating the inner roller relative to the outer roller to pass the second shade The extension groove formed in the outer roller is retracted to the inner roller; the locking member is pivoted at a fully retracted position of the inner roller to disengage from the locking engagement with the outer roller to allow the outer roller to rotate ; And rotating the outer roller by driving the inner roller to retract the first shade to the outer roller. In some examples, the method includes: axially moving a locking member outside the periphery of the outer roller during the extension of the first shade, after the first shade reaches the fully extended position Immediately rely on the locking member to restrict the rotation of the outer roller; during the extension of the second shade, axially move a nut positioned inside the inner roller; and after the second shade reaches a fully extended position Immediately, the rotation of the inner roller is restricted by the nut. The present invention is given to facilitate understanding, and those skilled in the art will understand that each of the various aspects and features of the present invention may be advantageously used alone in some instances, or in other instances Other aspects and features of the present invention are used in combination. Therefore, although the invention is presented in terms of examples, it should be understood that individual aspects of any one instance may be claimed individually or in combination with the aspects and features of that instance or any other instance. The invention is set forth in various levels of detail in this application and in this summary is by limitation, with or without the inclusion of elements, components, or the like, without the intended scope of the claimed subject matter. In some instances, details that are not necessary for understanding the invention or that make other details difficult to perceive may have been omitted. It should be understood that the claimed subject matter is not necessarily limited to the specific examples or configurations illustrated herein.

Cross-reference to related applications This application is based on 35 U. S. C. § 119 (e) claims the benefit of US Provisional Application No. 61 / 834,080, filed on June 12, 2013 and titled "Covering for an Architectural Opening Having Nested Rollers", and this application also claims March 2014 Application No. 14 / 213,449 entitled "Covering For an Architectural Opening Having Nested Rollers" filed on the 14th, and this application further claims that the application filed on March 14, 2014 and titled "Covering For an Architectural Opening Having Nested Rollers "priority is U.S. Patent Application No. 14 / 212,387, which is based on 35 U. S. C. § 119 (e) advocates application No. 61/834 of June 12, 2013 and titled "Covering for an Architectural Opening Having Nested Rollers", Interests in US Provisional Application No. 080, These applications are hereby incorporated herein by reference in their entirety. The present invention provides a covering for a building opening. Generally speaking, The covering may include both a first shade and a second shade which are suspended from the same head rail by forming a pair of nested rollers of a pair of roller units. The first shade (in this configuration, the front shade) is engaged with an outer roller for retraction to the outer roller by being wound around and unfolded from the outer roller (if actuated by a user) Above and extending from it. The second shade (later the shade in this configuration) meshes with an inner roller positioned on the inside of the outer roller for being wound around the inner roller and unrolled from the inner roller (if Move) and retract onto and extend from it. The inner roller can be positioned inside the outer roller and the inner roller and the outer roller can form a roller unit together, As explained further below. When the first shade is in the fully extended position, the second shade can be extended and retracted as guided by a user. The operating unit that causes the rollers to rotate, if caused by the user, can be operated by, for example, a motor or a single control rope. The operation unit can engage the inner roller and control the rotation of the inner roller, This in turn can control the rotation of the outer tube. Referring to FIGS. 1 to 5, A retractable covering 10 is provided for a building opening. The retractable covering 10 may include a head rail 14, A first bottom rail 18, One second bottom rail 20, A first shade 22 and a second shade 24. The first shade 22 may extend between the head rail 14 and the first bottom rail 18. The second shade 24 may extend between the head rail 14 and the second bottom rail 20. The head rail 14 may include two opposite end caps 26a, 26b, Opposing end caps 26a, 26b may enclose the end of the head rail 14 to provide a finished appearance. The first bottom rail 18 may extend horizontally along one of the lower edges of the first shade 22 and may be used as a ballast to maintain the first shade 22 in a tensioned condition. The second bottom rail 20 may extend horizontally along a lower edge of one of the second shades 24 and may be used as a ballast to maintain the second shade 24 in a tensioned condition. The first shade 22 may include a vertically suspended front sheet 30 and a rear sheet 34 of a flexible material, such as a tulle, and a plurality of horizontally-extending flexible blades 38. Each of the blades 38 may be fixed along a horizontal attachment line, One of the front edges is attached to the front sheet 30 and one of the rear edges is attached to the back sheet 34. Sheet 30, 34 and blade 38 can form a plurality of elongated vertically aligned longitudinally extending units, It may be collectively referred to as a honeycomb panel. Sheet 30, 34 and / or blades 38 may be constructed of continuous material length or may be Overlapping or other suitable strips of material that are attached or joined together. The second shade 24 can be a single panel and can be side-to-side, Overlapping or other suitable strips of material that are attached or joined together. The first shade 22 and the second shade 24 may be constructed of substantially any type of material. For example, Shade 22, 24 Can be made of natural and / or synthetic materials (including fabrics, Polymer and / or other suitable materials). The fabric material may include woven fabric, Non-woven fabrics, Knitwear or other suitable fabric types. Shade 22, 24 may have any suitable level of light transmission. For example, The first shade 22 and the second shade 24 may be transparent, Translucent and / or opaque materials are constructed to provide a desired atmosphere or setting in an associated room. In some instances, The first shade 22 includes a transparent and / or translucent sheet 30, 34 and the translucent and / or opaque blades 38. In some instances, The second shade 24 is made of a single sheet of material with zero light transmittance, Usually called a blackout shade. The second light shield 24 may include a pattern or design so that when the second light shield 24 is extended behind the first light shield 22, The second light shield 24 forms an aesthetic appearance different from that of the first light shield 22 itself. Referring to FIGS. 1 to 6, The cover 10 may include a first shade 22 configured to The second light shield 24 or both raises or retracts to drive or operate the mechanism 40. The operating mechanism 40 may be controlled mechanically and / or electrically. The operating mechanism 40 may include a speed control device to control or adjust the shade 22, Extension or reduction of 24. In some instances, The operating mechanism 40 may include an operating element 42 (such as a ball chain, A rope or a rod) to allow the user to extend or retract the first shade 22 and / or the second shade 24. In order to make the shade 22, 24mobile, An operator can manipulate the operating element 42. For example, In order to make the shade 22, 24 is raised or retracted from an extended position, The operator can pull the operating element 40 in a downward direction. In order to make the shade 22, 24 extends or lowers from a retracted position, The operator can manipulate the operating element 42 to release a brake, This allows the shade 22, 24 Automatically lowered under the influence of gravity. In addition or another option, The operating mechanism 40 may include a mechanism configured to rotate the shutter 22 after receiving an extend or retract command. 24 extends or retracts one of the electric motors 44. The motor 44 may be hard-wired to a switch and / or operatively coupled to a receiver operable to communicate with a transmitter, such as a remote control unit 46, To allow a user to control the motor 44 and therefore the shade 22, Extension and withdrawal of 24. The motor 44 may include a gravity-reduced state to permit the shade 22, 24 is reduced by gravity without motor intervention, This reduces power consumption. Referring to Figure 6, The cover 10 may include a double roller unit 46 that may be disposed within the head rail 14. The double-roller unit 46 may include an inner roller 48 and an outer roller 50. The inner roller 48 can be positioned inside the outer roller 50, And wheel 48, 50 may be coaxially aligned around the same rotation axis 52. Wheel 48, 50 may be concentric around a central axis of the inner roller 48. Referring to FIG. 6 and FIG. 7, The inner roller 48 may be generally cylindrical in shape and may be formed as a tube. The second light-shielding object 24 may be A corresponding retaining feature or other suitable attachment member is attached to the inner roller 48 at a top edge. In some instances, A longitudinally extending recess 52 is formed in the peripheral wall of the inner roller 48 and can receive an adhesive bead configured to adhere the top edge of the second shade 24 to one of the inner rollers 48. The outer roller 50 may be generally cylindrical in shape and may surround the inner roller 48. The outer roller 50 may be formed of two pieces that are interlocked with each other. Referring to Figure 6, The outer roller 50 may include a first casing 54 and a second casing 56 nested together. Referring to FIG. 6 and FIGS. 8 to 11, The longitudinally extending edge portions 58 of the first casing 54 and the second casing 56, respectively 60 can overlap and interlock with each other. The first shade 22 may be A corresponding retaining feature or other suitable attachment member is attached to the outer roller 50 at a top edge. In some instances, A pair of channels 62 are formed in the peripheral wall of the outer roller 50 and configured to receive and fix the top edge of the first shade 22. Referring to FIGS. 8 to 11, The insert 64 may be positioned in one of the hems formed on each of the top edges and may be used to hold the top edges in the respective channels 62. Referring to Figure 7, The inner roller 48 and the outer roller 50 may extend substantially the entire distance between the right end cap 26a and the left end cap 26b. The inner roller 48 and the outer roller 50 may have the same or substantially the same length. The first shade 22 and the second shade 24 may have the same or substantially the same width, It can be equal to the rollers 48, 50 length. In some instances, The first shade 22 and the second shade 24 have equal widths matching the length of the inner roller 48 and the outer roller 50, This can eliminate the shade 22, The existence of a light gap between the edge of 24 and the side of the building opening. Referring to FIG. 6 and FIG. 7, By opposing end caps 26a, 26b supports the double roller unit 46 in a rotatable manner. The operating mechanism 40 may be anchored to the right end cap 26 a and may be actuated, for example, by the operating element 42 or the remote control unit 46. The operating mechanism 40 may be operatively associated with the inner roller 48 such that it rotates. The operating mechanism 40 may include an internal fitting 64 that can be received in the inner roller 48 and can tightly engage the wall of the inner roller 48. The internal fitting 64 can be driven to rotate by an operating mechanism 40, such as a motor 44, And therefore, the inner roller 48 can be driven to rotate. The operating mechanism 40 may include one of the planetary gear drives typically utilized in window covering applications. Continuing Figures 6 and 7, A restriction screw 66 can be positioned inside the inner roller 48 and can be fixed to the left end cap 26b so that the restriction screw 66 does not rotate. A restriction nut 68 can be threadedly engaged with the restriction screw 66 and can be rotatably keyed to the wall of the inner roller 48. The key structure allows the restriction nut 68 to move along the length of the inner roller 48. When the inner roller 48 rotates, The restriction nut 68 can be moved along the threaded restriction screw 66, A restriction stopper formed on the restriction screw 66 can be engaged to define the lowest extension position of the second shade 24 (see FIG. 5). In addition or another option, A top limit stop can be used on the limit screw 66 if desired. Referring to Figure 6, The right sleeve 70a and the left sleeve 70b may be axially aligned with the inner roller 48 and may be disposed adjacent to opposite ends of the inner roller 48. The right sleeve 70a can be rotatably mounted on the operation mechanism 40, In addition, the left sleeve 70b can be rotatably mounted on the limiting screw 66. Sleeve 70a, 70b can be locked into the end of the outer roller 50 to maintain the housing 54, An essential spatial relationship between 56. Sleeve 70a, 70b may each include a pair of axial protrusions 72a, 72b. One of the protrusions 72a can engage the first housing 54, And the other protruding portion 72 b can engage the second casing 56. When the sleeve 70a, When 70b meshes with the opposite end of the outer roller 50, Sleeve 70a, 70b and the outer roller 50 can rotate uniformly around the rotation axis 52 of the inner roller 48 and the outer roller 50. Referring to FIGS. 8 to 11, The first casing 54 and the second casing 56 of the outer roller 50 may each define a tightly receiving sleeve 70a, 70b axial projection 72a, One of 72b remains characteristic. The retaining feature may be formed as a spaced-apart shelf 74 extending inwardly from the outer roller 50 to an interior space defined by the outer roller 50. When the sleeve 70a, When 70b meshes with the end of the outer roller 50, Axial projection 72a, 72b can be tightly received between the shelf 74 and the peripheral wall of the outer roller 50 to prevent relative movement between the first casing 54 and the second casing 56. Continuing FIGS. 8 to 11, The first casing 54 and the second casing 56 may define a groove 76 extending along a length of the outer roller 50 and communicating with the interior of the outer roller 50. The slot 76 permits the passage of the second shade 24 during the extension and retraction of the second shade 24. When the first end portions 58 of the first casing 54 and the second casing 56 are respectively, When 60 interlocked together, Second longitudinally extending edge portions 78 of the first casing 54 and the second casing 56; 80 may be spaced apart from one another along the perimeter to define a slot 76. Opposite second edge portions 78 of the first casing 54 and the second casing 56, 80 can be spaced a sufficient distance from each other to allow the second shade 24 to pass, However, the bottom rail 20 of the second shade 24 is prevented from passing through. Sleeve 70a, 70b axial projection 72a, 72b can maintain the width of the slot 76 during operation of the cover 10. The slot 76 may be positioned on the outer roller 50 so that the first shade 22 is at its extension, The blades are in the open configuration above and adjacent to the rearmost portion of the channel 62 pair. With continued reference to FIGS. 8 to 11, The outer roller 50 may define a recessed seat 81 in one of the circumferential walls on both sides of the groove 76. The seat 81 may be formed as a recessed portion extending along the length of the groove 76. The seat 81 may include opposite edge portions 78, 80 forms a substantially vertically oriented base wall 84. The seat 81 may be configured to receive the second bottom rail 20 when the second shade 24 is in the fully retracted position (see FIG. 8). The base wall 84 may allow a relatively vertical tangent engagement and disengagement between the second bottom rail 20 and the outer roller 50. The groove 76 and the seat 81 can be positioned on the circumference of the outer roller 50 above the attachment point 62 of the sheet 34 behind the first shade 22, The positions of the slot 76 and the seat 81 may be referred to as 3 o'clock in FIGS. 9 to 11. When the second bottom rail 20 is pulled vertically upward into the seat 81 during retraction, The positioning of the seat 81 and the groove 76 near the farthest rear position on the circumference of the outer roller 50 together with the shape of the seat 81 allows the second bottom rail 20 to be securely received (see FIGS. 8 to 10). The shape of the seat 81 and its orientation on the outer roller 50 can promote the smooth and predictable disengagement of the second bottom rail 20 from the seat 81, To start the extension of the second shade 24. The shape and orientation of the seat 81 allows the bottom rail 20 to exit the seat 81 vertically, This uses the gravity on the relatively heavy bottom rail 20. The generally tangential orientation of the seat 81 on the outer roller 50 can help in this regard. The lower free edge of the slot 76 (defined by the edge portion 80 of the second housing 56 of the outer roller 50) may be curved or circular to allow the second shade 24 to extend and retract through the slot 76 to The two light-shielding objects 24 travel smoothly above the edge portion 80. The second bottom rail 20 may be an elongated member having a relatively high quality and defining a groove extending along its length to receive and retain a lower edge of the second shade 24. The lower edge of the second shade 24 can be retained in the groove of the bottom rail 20 by an insert 82 positioned in one of the folds formed in the lower edge of the second shade 24. A portion of the outline of the second bottom rail 20 may generally match the shape of the seat 81 formed in the outer roller 50 to conform to the second shade 24 when it is in the retracted position. Referring to FIGS. 7 to 11, The first shade 22 may be coupled to the outer roller 50 and may be wound on the outer roller 50. One of the upper edges of each of the front sheet 30 and the rear sheet 34 may be attached to the outer roller 50 at circumferentially spaced positions. The first shade 22 may be wound on the outer roller 50 or deployed from the rear side of one of the outer rollers 50, The rear side of the roller 50 is positioned between a front side of the roller 50 and a street side of an associated building opening (in FIGS. 8 to 11, The side of the roller 50 is tied to the right). usually, Rotation of the outer roller 50 in a first direction (counterclockwise in FIGS. 8 to 11) by retracting the first shade 22 around the outer roller 50 causes it to retract to a side adjacent to an opening of an associated building Or one of the sides (such as the top side), And the rotation of the outer roller 50 in a second opposite direction causes the first shade 22 to extend across the opening (such as to the bottom side). Still referring to FIGS. 7 to 11, The second shade 24 may be coupled to the inner roller 48 and may be wound on the inner roller 48. An upper edge of one of the second shades 24 may be attached to the inner roller 48, As discussed previously. The second light-shielding object 24 can be wound on the roller unit 46 or deployed from the rear side of one of the roller units 46, The rear side of the roller unit 46 is positioned between a front side of the roller unit 46 and a street side of an associated building opening (in FIGS. 8 to 11, The rear side of the roller unit 46 is tied to the right). usually, The rotation of the inner roller 48 in a first direction (counterclockwise in FIGS. 8 to 11) is retracted to the side adjacent to an opening of an associated building by winding the second shade 24 around the inner roller 48 Or one of the sides (such as the top side), And the rotation of the inner roller 48 in a second opposite direction causes the second shade 24 to extend across the opening (such as to the bottom side). The operation of the covering is explained below with reference to FIGS. 1 to 5 and 7 to 11. As shown in Figures 1 and 7, The first shade 22 and the second shade 24 are in a fully retracted position and are hidden inside the head rail 14. In this configuration (see Figure 7), The second shade 24 is completely wound on the inner roller 48 and the first shade 22 is completely wound on the outer roller 50. In some instances, The first bottom rail 18 engages a portion of the head rail 14 to define a top limiting stop. In order for the first shade 22 to extend from the head rail 14, The user can actuate the operating mechanism 40 to cause the inner roller 48 to rotate in an extending direction (clockwise in FIGS. 8 to 11), This causes the outer roller 50 to rotate in an extending direction (clockwise in FIGS. 8 to 11) at least in part due to a downward force applied to the first shade 22 by the weight of the first bottom rail 18. When the first shade 22 extends away from the rear of the outer roller 50, The outer roller 50 generally rotates in concert with the inner roller 48. The double roller unit 46 usually rotates in a direction in which the user controls the inner roller 48 to rotate. Referring to FIG. 2 and FIG. 8, The first shade 22 extends away from the rear of the outer roller 50 in a closed or folded configuration, The front sheet 30 and the rear sheet 34 are relatively close together and the blade 38 is substantially coplanar with one of the front sheet 30 and the rear sheet 34. The connected relationship extends vertically. Once the first shade 22 is substantially deployed from the outer roller 50, Continued rotation of the outer roller 50 in the extension direction causes the front sheet 30 and the rear sheet 34 to move substantially vertically relative to each other to shift the blade 38 from a closed position (Figures 2 and 8) to an open position (Figures 3 and 9). ). A rear portion of the first bottom rail 18 may be heavier than a front portion of the bottom rail 18 to facilitate the full opening of the blade 38. Referring to FIGS. 3 and 9, The cover 10 is shown having a first shade 22 in a fully extended position, The blades 38 have an open or expanded configuration. In this position, The front sheet 30 and the rear sheet 34 are horizontally spaced, With blades 38 extending substantially horizontally therebetween, In addition, the attachment points 62 of the front sheet 30 and the rear sheet 34 and the outer roller 50 may be disposed at the same height. In Figure 9, For example, The position of the attachment point 62 can be said to be at 4 and 8 o'clock, And placed at substantially the same level as each other. Rotation of the outer roller 50 from either direction shown in FIG. 9 causes the front sheet 30 and the rear sheet 34 to move toward each other and the blades 38 are reoriented to be more vertically aligned. When the first shade 22 is fully deployed from the outer roller 50, The slot 76 in the outer roller 50 is rotatably oriented in the head rail 14 so that the bottom rail 20 of the second shade 24 can be further rotated in the extending direction of the inner roller 48 and then exits the seat 81 vertically. When the tension in the second shade 24 decreases due to the continued rotation of the inner roller 48 in the extending direction, The substantially tangential orientation and substantially vertical positioning of the seat 81 and a relatively vertical base wall 84 (see FIGS. 10 and 11) allow the weight of the second bottom rail 20 to separate the bottom rail 20 from the outer roller 50. The operating mechanism 40 may include a brake system operatively coupled to one of the inner rollers 48 to restrict unwanted downward movement of the second shade 24 and therefore the first shade 22. To extend the second shade 24, The operation mechanism 40 is further actuated by the user to rotate the inner roller 48 in the extending direction. During the extension of the second shade 24 (see FIGS. 4 and 10), The outer roller 50 and the first shade 22 can be kept fixed due to the weight of the first shade 22 and the weight of the first bottom rail 18, Thus, the rotational position of the outer roller 50 is maintained without relying on a forced lock. In some instances, As discussed below, A positive lock can be used to prevent the outer roller 50 from rotating immediately after the first shade 22 is fully extended. As shown in Figures 10 and 11, During the extension of the second shade 24, The slot 76 defined in the outer roller 50 may be guided backwards and may be aligned substantially horizontally with the rotation axis 52 (see FIG. 6) of the inner roller 48 and the outer roller 50. In other words, The second shade 24 can be deployed behind the inner roller 48 and the outer roller 50. During the extension of the second shade 24, The inner roller 48 rotates relative to the outer roller 50, Among them, the fitting 64 and the limiting nut 68 support the respective ends of the inner roller 48. When the inner roller 48 rotates in the extension direction, The second shade 24 is released from the inner roller 48, This is because it extends through a slot 76 formed in the outer roller 50. The rotation of the inner roller 48 in the extension direction causes the restricting nut 68 to restrict the stopper along the restricting screw 66 toward the bottom. 5 and FIG. 11, The cover 10 is shown to have a first shade 22 and a second shade 24 both of which are in a fully extended position, The blades 38 have an open or expanded configuration. In this position, The front sheet 30 and the rear sheet 34 are horizontally spaced, There are blades 38 extending substantially horizontally therebetween. The second light-shielding object 24 may be a black light-shielding object and prohibit light from passing through the second light-shielding object 24 and thus the first light-shielding object 22. When the second shade 24 is fully extended (see FIGS. 5 and 11), The second light-shielding object 24 can be shifted backward from the first light-shielding object 22, However, it may extend in coexistence with the first shade 22 in length and width. To control the amount of light passing through the first shade 22, The second shade 24 can be retracted into the head rail 14 and wound on the inner roller 48 of the double roller unit 46. When the second shade 24 is in the fully extended position (lowest extension), The limiting nut 68 may be positioned on the limiting screw 66 (see FIG. 6) to engage with a lower limit stop formed on the limiting screw 66 to prevent further rotation of the inner roller 48. The limiting screw 66 may also include an upper limit stop to define the upper limit of the cover 10. Another option, When the first shade 22 is fully retracted, the bottom rail 18 of the first shade 22 can engage a part of the head rail 14 to serve as an upper limit stopper of the cover 10. At any point during the extension process, The user can stop the operation mechanism 40 or reverse the direction of the operation mechanism 40 to move the first shade 22 and the second shade 24 to a desired position. In the example including a motorized cover 10, Pre-programmed commands may be used to control the motor 44 and thus the positions of the first shade 22 and the second shade 24. These commands can instruct the motor 44 to move the first shade 22 and the second shade 24 to a predetermined shade position (such as a first position in which the first shade 22 and the second shade 24 are fully retracted, The first light-shielding object 22 is fully extended and the second light-shielding object 24 is fully retracted (a second position and the first light-shielding object 22 and the second light-shielding object 24 are fully extended a third position). These commands can be transmitted to the motor 44 via the remote control unit 46. Compared to the extended sequences such as those generally described above following Figures 8-11, The retraction of the first shade 22 and the second shade 24 can be performed in reverse order. In FIGS. 5 and 11, The first shade 22 and the second shade 24 are disposed in a fully extended position. When both the first shade 22 and the second shade 24 are in the fully extended position, The restriction nut 68 (see FIG. 6) can be engaged with a lower limit stopper that can be formed on the restriction screw 66. Actuation of the operating mechanism 40 from this position (such as by the operating element 42 and / or the motor 44) moves the limit nut 68 axially away from the lower limit stop and begins the retraction procedure of the cover 10. This retraction procedure generally involves actuating the operating mechanism 40 to first rotate the inner roller 48 in a retraction direction (counterclockwise in FIG. 11) to retract the second shade 24, And when the second shade 24 is fully retracted, Then, the outer roller 50 is rotated in a retracting direction (counterclockwise in FIG. 11) to retract the first shade 22 onto the outer roller 50. This sequence is further explained below. In order to retract the second light-shielding object 24 from the fully extended position of FIGS. 5 and 11, The user activates the operating mechanism 40 to cause the inner roller 48 to rotate in a retracted direction (counterclockwise in FIGS. 8 to 11), This in turn causes the second shade 24 to be wound on the inner roller 48 and rises along the rear surface of one of the sheets 34 behind the first shade 22 to raise the second bottom rail 20. During the retraction of the second shade 24, The inner roller 48 rotates relative to the outer roller 50, Among them, the fitting 64 and the limiting nut 68 support the respective ends of the inner roller 48. When the inner roller 48 rotates in the retracting direction, The second shade 24 is wound onto the inner roller 48, This is because it is pulled through a slot 76 formed in the outer roller 50. The rotation of the inner roller 48 in the retracting direction causes the restriction nut 68 to move along the restriction screw 66 toward the opposite end of the restriction screw 66. In addition, during the retraction of the second shade 24, The first shade 22 is kept fully extended due to the weight of the first bottom rail 18 and the weight of the portion of the first shade 22 suspended from the outer roller 50 to the outer roller 50 to prevent the outer roller 50 from rotating. Open position. This allows the user to move the second shade 24 between the fully extended position and the fully retracted position without affecting the position or orientation of the first shade 22. Referring to Figures 9 and 10 in reverse order, When the second shade 24 is further retracted into the outer roller 50, The second bottom rail 20 becomes firmly positioned in the seat 81. After the bottom rail 20 engages the seat 81 of the outer roller 50, The driving force of the operating mechanism 40 can be transferred to the outer roller 50 through the second light-shielding object 24 by turning. that is, The operating mechanism 40 can apply a rotating force to the inner roller 48, The rotating force can be applied to the outer roller 50 through the meshing of the bottom rail 20 in the seat 81 under the tension of the second shade 24. Referring to FIG. 8 and FIG. 9, When the second shade 24 is completely wound on the inner roller 48 and the second bottom rail 20 is received in the seat 81 of the outer roller 50, The outer roller 50 can be driven in the same retracted direction by the operation mechanism 40 rotating through the inner roller 48 in a retracted direction (counterclockwise in FIGS. 8 and 9). As such, When the bottom rail 20 is received in the seat 81 and a retracting force (counterclockwise in FIGS. 8 and 9) is applied to the inner roller 48 by the operating mechanism 40, The outer roller 50 is usually rotated together with the inner roller 48. Referring to Figure 8, When the outer roller 50 continues to rotate in the retracting direction, The first shade 22 is wound on the outer roller 50. The first shade 22 is under tension when it is wound around the outer roller 50 due to the weight of the hanging portion of the first shade 22 and the bottom rail 18. When the first shade 22 is fully retracted, The first bottom rail 18 can engage a portion of the head rail 14 (such as a butt face) to serve as a top limit stop for a dual roller unit 46. Expecting other mechanisms to define the top retracted position, A top limit stop is located on the limit screw 66 opposite the bottom limit stop. For example, A top limit stop may be formed on the limit screw 66 and positioned along the screw 66 so that the nut 68 immediately engages the top limit stop after the first shade 22 is fully retracted. As explained above, When the user activates a single operating element 42 or a motor 44 for causing the shade 22, In the case where both are retracted, the second shade 24 and then the first shade 22 are retracted from the fully extended position. The restriction screw 66 includes a sufficient length to allow the restriction nut 68 to restrict the stop from moving along the screw 66 from the bottom until the top retracted position is obtained. It is contemplated that the first shade 22 may be wound on the outer roller 50 or deployed from the front side of the outer roller 50. The accompanying modifications to the structure described in this article will be necessary to facilitate the implementation of the double-roller shade technology as applied to a face-down shade structure. The cover may include a lock mechanism that restricts rotation of the outer roller 50 when the first shade 22 is in the fully extended position, This ensures that the first shade 22 remains in the fully extended position and is substantially unaffected by the rotation of the inner roller 48 during the extension of the second shade 24. The lock mechanism may be movable between a first position that restricts rotation of the outer roller 50 and a second position that permits rotation of the outer roller 50 (such as pivoting, Panning or other suitable for moving). In one example, The lock mechanism includes a lock member positioned outside the outer roller 50, The locking member is translated longitudinally along an outer periphery of one of the outer rollers 50 and engages a stopper to restrict the rotation of the outer roller 50. In another example, The lock mechanism includes a lock member positioned outside the outer roller 50, The locking member is pivoted into engagement with the outer roller 50 to restrict the rotation of the outer roller 50. Referring to FIGS. 12 to 27, Providing a covering for a building opening, After the cover is completely extended, the cover uses a locking mechanism to forcibly lock the rotation of the outer roller. In addition to a lock mechanism and retaining clip, The coverings shown in FIGS. 12 to 27 also generally have the same features and operations as the coverings shown in FIGS. 1 to 11. therefore, The foregoing discussion of the features and operations of the coverings illustrated in FIGS. 1 to 11 should generally be considered applicable to the coverings illustrated in FIGS. 12 to 27, Except as described in the following discussion. The reference numbers used in Figures 12 to 27 generally correspond to the reference numbers used in Figures 1 to 11 to reflect similar parts and assemblies, Except that the reference number is increased by one hundred. Referring to Figure 12, Cover 110 includes an axially movable lock similar to the pivotally movable locking mechanism discussed below with reference to FIGS. 28 to 47 to restrict rotation of outer roller 50 when first shade 22 is in the fully extended position.锁 机构 186. The axially movable locking mechanism 186 may include a housing 187, The journal is supported to a rotatable shaft member 188 of the housing 187 and a nut 189 which is threadedly engaged with the shaft member 188 and can travel axially along the shaft member 188. Although the axially movable locking mechanism 186 is shown together with the left end cap 126b, However, the lock mechanism 186 may be used in conjunction with the right end cap 126a. Refer to Figure 12, Figure 16 and Figure 18, The housing 187 can overhang from the left end cap 126b and extend away from the left end cap 126b along one outer periphery of the outer roller 150 toward the right end cap 126a. One end 187a of the housing 187 can be removably connected to the left end cap 126b by a fastener 190, And one of the opposite free ends 187b of the casing 187 can be positioned laterally outward from the outer roller 150. The housing 187 may be laterally separated from the periphery of the outer roller 150 by a sufficient distance so as not to interfere with the first shade (not shown) wrapped around the outer roller 150 or deployed from the outer roller 150. The casing 187 may be laterally separated from the periphery of the outer roller 150 by a uniform distance. Refer to Figure 16, Figure 18, Figure 21 and Figure 26, Opposite end portions 187a of the casing 187, 187b may include an axially extending collar 191 and a mating flange 192 extending outwardly from the collar 191. The collar 191 may include an inner wall 193 (see FIGS. 22 and 26) defining a shaft member aperture 194 that receives a journal portion 195 of the rotatable shaft member 188, The journal portion 195 abuts against the inner wall 193 in a rotatable manner. The inner wall 193 of the collar 191 may also define that the shaft member 188 may be permitted to rotate during the axial insertion of the shaft member 188 into the housing 187 or removal of the shaft member 188 from the housing 187. The stopper 197) passes through one of the key holes 196. The docking flanges 192 may each define a configuration to receive the connection of the housing 187 to a respective end cap 126a, 126b one fastener 190 one fastener aperture (see Figure 12, Figure 14, Figure 16, (Figures 18 and 22). End portion 187a of the casing 187, 187b may be mirror images of each other to facilitate the interconnection of the housing 187 to the left end cap 126b or the right end cap 126a. Continue to refer to Figure 12, Figure 16, Figure 18, Figure 21 and Figure 26, The housing 187 may include an end portion 187a, 187b interconnects one of the middle portions 187c. The middle portion 187c may extend longitudinally in a laterally spaced relationship along one outer periphery of one of the outer rollers 150. The middle portion 187c of the case 187 may include opposite end portions 187a, The distance between 187b is a base 198 and a guide rail 199. The base 198 of the housing 187 may define a portion close to the end portion 187a, The stopper receiving aperture 200 of 187b allows the passage of the stopper of the shaft 188 during the rotation of the shaft 188 relative to the housing 187, As a result, the lateral profile of the casing 187 is reduced. The base 198 of the casing 187 may also be included in the end portion 187a, One stiffener 201 extending longitudinally between 187b, The stiffening rib 201 stiffens the casing 187 and reduces lateral displacement or buckling of the middle portion 187c of the casing 187. As shown in Figure 27, The stiffening rib 201 may include at least one laterally extending buttress 202 further increasing the stiffness of the longitudinally extending rib 201. Refer to Figure 12, Figure 16 to Figure 19, Figure 23 and Figure 26, The shaft member 188 of the axially movable locking mechanism 186 can be offset from a rotation shaft 152 of one of the inner rollers 148, But parallel or substantially parallel to the rotation axis 152. The shaft member 188 may be positioned outside the outer roller 150 and extend longitudinally along an outer periphery of the outer roller 150 in a spaced relationship. The shaft member 188 may include a journal portion 195 rotatably received within a collar 191 of the housing 187. The journal portion 195 of the shaft member 188 may include a recessed circumferential region that reduces the contact area (and thus friction) between the bearing surface 193 of the collar 191 and the journal portion 195 of the shaft member 188. The shaft member 188 may include a threaded portion 203 between the journal portion 195 of the shaft member 188 and extending between the collars 191 of the housing 187. A stopper 197 may be formed on the shaft member 188 near the end of the threaded portion 203 of the shaft member 188. The stopper 197 may extend radially outward from the shaft member 188 and may be axially aligned with the aperture 200 formed in the base 198 of the housing 187 (see FIG. 21) so that during rotation of the shaft member 188 relative to the housing 187 The stopper 197 enters and exits the aperture 200 in a rotatable manner. A gear 204 may be non-rotatably attached to one end of the shaft member 188 and may define a central cavity for laterally positioning the gear (and thus the shaft member 188) relative to the end cap 126b. Refer to Figure 12, Figure 16, Figure 18 and Figures 24 to 27, The nut 189 of the axially movable locking mechanism 186 is positioned at least partially within the housing 187 and travels axially along the shaft member 188 within the middle portion 187c of the housing 187. The nut 189 is keyed to the housing 187 such that when the shaft member 188 rotates, the nut 189 translates along the shaft member 188 instead of rotating about the shaft member 188. The nut 189 includes a body 205 that extends only partially around the shaft 188 and may be referred to as a half nut 189. In an alternative design, The nut 189 may extend around the entire circumference of the shaft member 188. 24 and 25, The nut 189 includes an internal thread 206 that is one of the external threads that protrudes inward from the main body 205 and engages the threaded portion 203 of the shaft member 188 in a threaded manner. To maintain the engagement of the threads and limit the rotation of the nut 189 about the shaft 188, The nut 189 may include two longitudinally extending wings 207 protruding radially outward from the body of the nut 189. The wings 207 may include axially extending fins 208, The axially extending fins 208 slidingly contact the opposite surface of the base 198 of the housing 187 (see FIG. 27) and guide the nut 189 axially along the middle portion 187c of the housing 187 while reducing the contact area between the nut 189 and the housing 187 (And therefore friction). One of the wings 207 may define a longitudinally extending slot 208 that at least partially receives one of the guide rails 199. As shown in Figure 27, The portions of the wings 207 that define the slot 208 may slidably abut different sides of the guide rail 199. As such, The wings 207 of the nut 189 can substantially prevent the nut 189 from rotating about the shaft 188, This facilitates translation of the nut 189 along the shaft 188 during rotation of the shaft 188 relative to the housing 187. For lateral stiffening wings 207, The nut 189 may include one laterally extending rib 209 positioned outwardly from the internal thread 206 and extending between the wings 207. In an alternative design, The nut 189 and the housing 187 may include various other corresponding keyed structures such that the nut 189 travels axially along the shaft 188 as the shaft 188 rotates relative to the housing 187. As explained, Rotation of the shaft member 188 relative to the housing 187 generally causes the nut 189 to move or translate axially along the shaft member 188. To limit the axial range of the nut 189, The shaft member 188 may include a stopper 197 extending outward from a periphery of the shaft member 188. Based on contact with nut 189, The stopper 197 generally restricts or restricts the translation of the nut 189 relative to the shaft 188, Thereby, further rotation of the shaft member 188 relative to the housing 187 is restricted or restricted. To ensure a strong engagement between the nut 189 and a respective stop 197, The nut 189 may include a longitudinally extending abutment wall 211 that interacts with the stopper of the shaft member 188 when the nut 189 reaches a desired stop position corresponding to one of the fully extended one of the first shades 22. As shown in Figure 24, The docking wall 211 may be formed at one end of the internal thread 206 of the nut 189. In addition or another option, The body 205 of the nut 189 (which may resemble an axially extending sleeve) may abut the mating flange 192 of the housing 187 to stop the nut 189 from moving along the shaft 188. The body 205 of the nut 189 may be radially separated from an outer periphery of the shaft member 188 by a sufficient distance to allow the shaft member stopper 197 to pass through an annular space defined between the shaft member 188 and the body 205. The shaft member 188 and the nut 189 may include two stoppers 197 and an abutment wall 211, respectively, to promote the interoperability between the lock mechanism 186 and the right end cap 126a or the left end cap 126b. This provides a robust design that can adapt to one of the left and right assemblies. Referring to FIGS. 15 to 17, The axially movable locking mechanism 186 may include a gear mechanism or gear train 213 positioned outside the inner roller 148 and the outer roller 150. The gear mechanism or gear train 213 may include a first gear 215 that is non-rotatably coupled to one of the outer rollers 150, Non-rotatably coupled to a second gear 204 of the shaft member 188 and an idle gear 217 meshing with the first gear 215 and the second gear 204. The idle gear 217 can be rotatably supported on a mounting plate 219, The mounting plate 219 includes a locator pin 221 that projects axially from the mounting plate 219 (see FIG. 17) toward the associated end cap 126. The locator pin 221 may be received in the end cap 126 to restrict rotation of the mounting plate 219 relative to the end cap 126. May depend on the size of the shade parts, Weight or other characteristics change the gear mechanism 213. In one example, The gear mechanism 213 provides a three-to-one gear ratio between the first gear 215 and the second gear 204. that is, For each rotation of the outer roller 150, The shaft 188 completes three turns. In one example, The external threads of the shaft member 188 have sixteen threads per inch (or a pitch of 1/16 of an inch). usually, The length of the threaded portion 203 of the shaft member 188 relative to the operating range of the nut 189 may be too large so that the shaft member 188 can adapt to many different shade lengths. therefore, In some instances, The nut 189 interacts with only one of the stops 197 on the rotatable shaft 188 during operation and provides the other stop so that the lock mechanism 186 can interact with either the right end cap 126a or the left end cap 126b use together. Referring to Figure 15, The gear mechanism 213 is illustrated as being associated with the left end cap 126b. External gear 204, 215, 217 is rotatably supported by a short thick shaft member protruding axially from the left end cap 126b. The idle gear 217 is positioned forward from the first gear 215, And the second gear 204 is positioned forward from the idle gear 217, All three gears 215, 204, 217 is located adjacent to the end cap in the same plane. The idle gear 217 is positioned upward from the first gear 215, And the second gear 204 is positioned upward from the idle gear 217. The first gear 215 and the idle gear 217 can be received in one side 223 protruding axially from the end cap 126b. Referring to Figure 13, An exploded view of a portion of the head rail assembly is provided (except for the right-side components that are substantially the same as those shown and discussed with respect to FIGS. 6-11). These components include a left end cap 126b, One of the non-rotatable restriction screws 166 attached to the left end cap 126b, A left sleeve 170b, which is mounted on one of the bearing surfaces of the restriction screw 166 and rotates relative to the bearing surface. A part of the limiting screw 166 (including the limiting nut 168) is received inside, and an inner roller 148 is mounted on a boss 167 of the left sleeve 170b and the right sleeve 170a. An outer roller 150, which is one of the inner rollers 148, and an axially movable lock mechanism 186 attached to the left end cap 126b are received inside. Refer to Figure 13, Figure 14, Figure 19 and Figure 20, The outer roller 150 may include a split housing design. Specifically, The outer roller 150 may include a first casing 154 and a second casing 156. In order to fix the first housing 154 and the second housing 156 together and maintain a desired spatial relationship relative to one of the other, Each of the first casing 154 and the second casing 156 of the outer roller 150 can tightly receive one of the axial projections 172a of the left sleeve 170b and the right sleeve 170a, 172b (see Figure 14, (Figures 18 and 19). Axial protrusion 172a, 172b can couple the outer roller 150 to the sleeve 170a, 170b to make the outer roller 150 and the sleeve 170a, 170b rotates uniformly around one rotation shaft 152 of the outer roller 150. The first gear 215 may be non-rotatably fixed to the left sleeve 170b with respect to the axial protrusion 172a, One of the opposite sides of 172b, This ensures that the first gear 215 rotates in unison with the outer roller 150. To further fix the first casing 154 and the second casing 156 together, Housing 154, 156 can be clamped together by at least one retaining clip 225 (Figures 12 to 13 show two retaining clips, (Although more or fewer clips may be used as desired to securely snap the housing together). As shown in Figure 20, The retaining clip 225 can be elastically snapped around the interlocking area 227 of the first casing 154 and the second casing 156. Referring to Figure 20, An end portion 158 of the first casing 154 and an end portion 160 of the second casing 156 may overlap each other and extend to a lip portion 233 at least partially extended in the longitudinal direction. Corresponding longitudinally extending receiving channel defined by 235 231. The lip 233 of the first casing 154 can be positioned inside the longitudinally extending edge 237 of one end of the second casing 156, The lip 235 of the second casing 156 can be positioned outside the longitudinally extending edge 239 of one end of the first casing 154 (though this configuration can be reversed). The retaining clips 225 may surround the outer detents 241, 241 formed in the interlocking areas of the first case 154 and the second case 156, respectively. 243 elastically buckles to clamp the first housing 154 and the second housing 156 together. 14 and 19, The split housing design of the outer roller 150 defines a longitudinally extending groove 176 that allows the second shade 24 to pass through during the extension and retraction of the second shade 24. When the edge portion 158 of the first case 154 and the edge portion 160 of the second case 156 are interlocked together, The opposite or second longitudinally extending end edge portions 178 of the first casing 154 and the second casing 156, 180 are spaced apart from one another along the perimeter and define longitudinally extending slots 176. Opposite second end edge portions 158 of the first casing 154 and the second casing 156, 160 can be spaced a sufficient distance from each other to allow the second shade 24 to pass, However, the bottom rail 20 of the second shade 24 is prevented from passing through. The function of the outer roller 150 is substantially the same as that discussed with respect to FIGS. 6 to 11 and therefore will not be repeated here for brevity. During the operation of the covering, When the outer roller 150 extends the first shade 22 across the building opening, The first gear 215 drives the idler gear 217, This in turn drives the second gear 204, This causes the nut 189 to traverse axially along the shaft member 188 toward a bottom end position. Once the nut 189 reaches the bottom end position (which can be defined by a stopper 197 on the shaft 188), The nut 189 restricts further rotation of the shaft 188 along the extending direction of the first shade 22, This in turn prohibits further rotation of the outer roller 150 in the extending direction. In a case where the outer roller 150 is restricted from further rotation in the extending direction and the first shade 22 is deployed from the periphery of the outer roller 150, The second shade 24 can be unrolled from the inner roller 148, It passes through a slot 176 in the outer roller 150 and extends across the building opening. When the inner roller 148 rotates during the extension of the second shade 24, The inner restriction nut 168 rotates in unison with the inner roller 148 and travels axially along the restriction screw 166 toward a bottom end stop formed on the non-rotatable restriction screw 166. The internal limit nut 168 typically contacts the bottom end stop to define one of the bottom rollers of the dual roller unit 146 when the second shade 24 is fully extended across the building opening. During the retraction of the covering from a fully extended position, The inner roller 148 pulls the second shade 24 through the housing 154 of the outer roller 150, Opposite longitudinally extending edge portions of 156, 178, A slot 176 defined between 180 and the second shade 24 is wound around a periphery of the inner roller 148 until the bottom rail 20 of the second shade 24 is seated against an outer periphery of the outer roller 150. During the retraction of the second shade 24, The weight of the bottom rail 18 of the first shade 22 is a sleeve 170a, 170b is maintained in a fixed condition and therefore the inner roller 148 is relative to the sleeve 170a, 170b and the outer roller 150 rotate. Once seated, The bottom rail 20 of the second shade 24 is about to transfer the rotation torque from the inner roller 148 to the outer roller 150, As a result, the outer roller 150 is rotated in a retracted direction and the first shade 22 is wound around a periphery of the outer roller 150. The inner roller 148 and the outer roller 150 continue to rotate in a retracted direction until the bottom rail 18 of the first shade 22 contacts one of the top limiting stops that can be associated with one or both of the end caps 126, The cover is now retracted into a fully retracted position. During the rotation of the inner roller 148 in the retracting direction, The inner restricting nut 168 moves away from the bottom stopper of the second shade 24 along the non-rotatable restricting screw 166 in the inner roller 148. During the rotation of the outer roller 150 in the retracting direction, The outer nut 189 moves away from the bottom stopper of the first shade 22 along the rotatable shaft 188. Referring to FIGS. 28 to 47, A covering is provided for a building opening including a pivotable lock mechanism. In addition to the pivotable lock mechanism and the multi-piece outer roller, The coverings shown in FIGS. 28 to 47 also generally have the same features and operations as the coverings shown in FIGS. 6 to 27. therefore, The foregoing discussion of the features and operation of the coverings illustrated in FIGS. 6 to 27 should generally be considered applicable to the coverings illustrated in FIGS. 28 to 47, Except as described in the following discussion. The reference numbers used in Figures 28 to 47 generally correspond to the reference numbers used in Figures 12 to 27 to reflect similar parts and assemblies, Except that the reference number is increased by one hundred. Referring to FIGS. 28 to 34, The inner roller 248 has a generally cylindrical shape, And, a holding member for fixing the top edge of the second shade 24 to one of them is formed. As mentioned above, The inner roller 248 is positioned inside the outer roller 250 to define a double roller unit, And in this example the scroll wheel 248, Both of 250 are coextensive around the same rotation axis 252. An upper edge of one of the second shades 24 is attached to the inner roller 248, And a lower edge of one of the second shades 24 is received in a groove formed in the second bottom rail 220, And an insert 282 is retained in the groove by positioning one of the folds formed on a bottom edge of the second shade 24. Other attachment structures may be used to attach the bottom rail 220 to the second shade 24. Continuing FIGS. 28 to 34, The second bottom rail 220 is an elongate member of relatively high quality and defining a slot extending along its length to receive and retain (as described above) a bottom edge of the second shade 24. The second bottom rail 220 has a substantially triangular cross section, One part of it substantially matches the shape of the seat 281 formed on the outer roller 250 to conform to the second shade 24 when it is in the retracted position. The actuator edge 247 is defined at one end of the second rail 220, And engaging the lock mechanism 286 to disengage the lock mechanism 286 from the outer roller 250, As explained in more detail below. In this example, the outer roller 250 is generally cylindrical, Several features are defined in its circumferential wall. The outer roller 250 defines a longitudinal central axis 252 around which the outer roller 250 rotates and the inner roller 248 is also positioned coextensively therewith. Forming a pair of channels 262 to receive and fix the top edge of the first shade 22, Wherein the inserts 264 are respectively positioned in one of the folds formed on each of the top edges, The insert 264 is used to hold the top edge in the respective channel 262. An anchor groove 245 is formed along the length of the outer roller 250 for receiving a roller lock bearing. As explained below. A groove 276 is formed along the length of the outer roller 250 and communicates with the inside of the outer roller 250, which may be referred to as a tube. A recessed seat 281 is formed on either side of the groove 276. The second shade 24 extends through the groove 276 and retracts, And when in the fully retracted position, The second bottom rail 220 is received in the seat 281 and nested therein for at least one of many purposes, As explained below. The slot 276 is positioned on the outer roller 250 so as to be above the two channels 262 and adjacent to the rearmost portions of the two channels 262 when the first shade 22 is in its extended position and the blades are open. Refer to Figure 28, Figure 29, Figure 46 and Figure 47, The double roller unit is rotatably supported between the right end cap 226a and the left end cap 226b, And the operation mechanism 240 is operatively associated with the inner roller tube 248 so as to rotate it. The operating mechanism 240 is anchored to the right end cap 226a and is actuated by the operating element 242 as described above in one example. In one example, Operating mechanism 240 may include one of the planetary gear drives typically utilized in window covering applications. The operating mechanism 240 may include one of the internal accessories 264 actuated by the operating mechanism 240. Fitting 264 is sized to be received in inner roller 248, The inner wall of the inner roller 248 is tightly engaged. When the accessory is driven by the operation mechanism 240, the inner roller 248 is driven to rotate by the inner accessory 264. The open right end of the outer roller 250 receives a right end roller cap 270a, The right end roller cap 270a includes a central aperture having an axially extending collar rotatably receiving an axial bearing surface formed on a housing of the operating mechanism 240. When the outer roller 250 rotates, the bearing surface supports the right end roller cap 270a when it rotates. The inner roller 248 is rotatably received on the collar. The collar rotatably supports the right end of the inner tube 248 when it is driven to rotate by the operating mechanism 240. As shown in Figure 46, The right end 248a of the inner roller 248 and the right end 250a of the outer roller 250 can be aligned with each other. And a right edge 24a of one of the second shades 24 may be connected to the rollers 248, Right end of 250 248a, 250a aligned. As shown in Figure 47, The left end 248b of the inner roller 248 and the left end 250b of the outer roller 250 can be aligned with each other. In addition, a left edge 24b of one of the second shades 24 may be connected to the rollers 248, Left end of 250 248b, 250b aligned. The first shade 22 can be wound on the outer roller 250, And the edge of the first shade 22 can be connected with the roller 248, The end of 250 and the edge of the second shade 24 are aligned. Wheel 248, 250 end and shade 22, The alignment of the edges of 24 can reduce or eliminate the light gap between the edge of the shade and the corresponding side of the building opening. When the second shade 24 is fully retracted onto the inner roller 248 and the second end rail 220 is received in the seat 281 of the outer tube 250, the outer roller 250 is driven to rotate by the inner roller 248. In this situation, When the inner roller 248 rotates, The second shade 24 tightens the second end rail 220, This in turn applies a force to the outer roller 250 at the interface between the second end rail 220 and the seat 281. This causes the outer roller 250 to rotate together with the inner roller 248. The outer roller 250 does not rotate with the inner roller 248, Unless the second shade 24 is fully retracted around the inner roller 248. As mentioned above, The operating mechanism 240 can be actuated by an operating element 242 to extend or retract the first shade 22 and the second shade 24 (as desired by the user). Many types of mechanisms for immediately causing the inner roller tube 248 to rotate after actuating the operating element 242 are acceptable. Continuing Figure 28 and Figure 29, A restriction screw 266 is positioned inside the inner roller 248, And it is operatively fixed to the left end cap 226b by a screw. The restriction screw 266 does not rotate. A restriction nut 268 is engaged with the restriction screw 266 in a threaded manner. And is rotatably keyed to the inside of the inner roller 248, The key structure allows the nut 268 to be restricted from moving along the length of the inner roller 248. When the inner roller 248 rotates, The restriction nut 268 moves along the threaded restriction shaft 266, And the engagement restricts the stopper by defining one of the bottommost extended positions of the second shade 24 (see FIG. 5). In this example, The retracted position of the first shade 22 is defined by the first shade 22 being completely wound on the outer roller 250. In some instances, The first bottom rail 18 engages a portion of the head rail 14 to define this position. Another option is or Although one of the top limit stops on the limit screw 266 is not used in this example, However, a top limit stop can be used on the limit screw 266 if desired. As shown in Figure 28, The left end cap 226b best seen in FIGS. 29 and 47 supports the inner roller 248 and the outer roller 250 in a rotatable manner. Refer to Figure 28, Figure 29 and Figure 40, A pivot bracket 249 is attached to the inside surface of the left end cap 226b and defines an annular boss 251 positioned in the center and a post 253 extending toward the right end cap 226a, The post 253 serves as a shaft on which the wheel lock 255 is pivotably mounted. The annular boss 251 on the pivot bracket 249 is rotatably received in the central aperture of the left outer roller cap 270b, The left outer roller cap 270b itself is received in the open left end of the outer roller 250. A collar extends axially from the central aperture around the cap 270b, And it is used as a bearing surface for relative rotation between the outer roller 250 and the left end bracket. The open left end of the inner roller 248 is rotatably received on the outer surface of the collar, This outer surface serves as a bearing surface for the rotation of the roller 248 relative to the collar, The rotation is selectively controlled by the operation mechanism 240. As shown in Figure 28, Figure 29, The roller lock 255 shown in FIGS. 38 and 39 is pivotably attached to a post 253 (see FIGS. 40 and 41) on the pivot bracket 249, And it is fixed to it by a fastener 257 (see FIG. 41). The roller lock 255 is pivotable relative to the pivot bracket 249 about an axis defined by the post 253. A spring member 259 (see FIG. 43) is positioned around the post 253 of the pivot bracket 249, The spring 259 has two legs, One of them engages the roller lock 255 to bias the roller lock 255 to mesh with the outer surface of the outer roller 250, And the other leg is operatively engaged with a part of the left end cap 226b. Referring to FIG. 38 and FIG. 39, The roller lock 255 includes a frame plate 261 having a central body 263 extending from an upper leg 265 and a lower leg 267 therefrom, 265 per leg, 267 lies in the same plane as the central body 263. The upper leg 265 and the lower leg 267 extend to each other at approximately a right angle, And it is expected that the relative positioning may be adjusted according to the geometry of the specific usage. The end of the lower leg 267 includes a pin 269 extending orthogonally from the plate 261 toward the opposite end cap, The pin 269 has a cylindrical shape and is relatively short. For example, The pin 269 does not extend far enough to interfere with the rotation of the roller 250. The length and shape of the pin 269 facilitates the moving engagement between the pin 269 and the actuator edge 247 on the second end rail 220, As explained below. With continued reference to FIG. 38 and FIG. 39, An end of the upper leg 265 rotatably supports a relatively long cylindrical bearing 271 extending orthogonally from the upper leg 265 toward the opposite end cap 226a. The bearing 271 is rotatably supported at the opposite end thereof by an arm 273 extending at an angle from the center plate 261. The arm 273 only supports the distal end of the bearing 271 from a top side, It does not extend much beyond the center of the bearing 271. This configuration makes the lower portion of the bearing 271 unobstructed along its length and can be received in the anchor groove 245 formed in the outer roller 250, And engage the outer surface of the outer roller 250 and ride along its surface, As explained further below. The operation of an example of the covering is explained below mainly with reference to FIGS. 30 to 34. As shown in Figure 30, Both the first shade 22 and the second shade 24 are in an extended position, And the blade 38 is in an open configuration. Referring briefly to Figure 30, The first shade 22 may be coupled to the outer roller 250 and may be wound on the outer roller 42. An upper edge of each of the front sheet 30 and the rear sheet 34 may be coupled to an inward guide, The gland or rib 275 extends longitudinally. The gland 275 may define an inner cavity 262 opened through a periphery of the outer roller 250. The shade 22 may be wound on the roller 250 or deployed from the rear side of one of the rollers 250, The rear side of the roller 250 is positioned between a front side of the roller 250 and a street side of an associated building opening (in FIG. 30, The side is to the right behind the wheel). usually, Rotation of the roller 250 in a first direction (counterclockwise in FIG. 30) retracts the shutter 22 to one or more sides adjacent to an opening of an associated building by winding the shutter 22 around the outer roller 250 ( Such as the top side) and the rotation of the roller 250 in a second opposite direction can cause the shade 22 to extend across the opening (such as to the bottom side). The first light-shielding object 22 is maintained in this open position by positioning the mesh points 262 of the rear sheet 30 and front-side sheet 30 and the outer roller 250 of the first light-shielding object 22 at the same height. For example, In Figure 30, The locations of these attachment points 262 may be referred to as being at 4 and 8 o'clock, This places the attachment points close to each other at the same level. If the outer roller 250 is rotated in any direction from that shown in FIG. 30, The front sheet 30 and the rear sheet 34 will then move towards the other and the blades 38 will be reoriented to be more vertically aligned. At this position where the first shade 22 and the second shade 24 are both at the fully extended position, The limiting nut 268 (see generally FIGS. 28 and 29) engages the lower limit. Actuation of the operating mechanism 240 from this position (such as by the operating element 242) begins to retract the second shade 24 into the head rail 14. The operating mechanism 240 first rotates the inner roller 248 counterclockwise in one of FIG. 30 to retract the second shade 24, And when the second shade 24 is fully retracted, The outer roller 250 is then actuated to retract the first shade 22 onto the outer roller 250. This sequence is further explained herein and below. As mentioned above, And still referring to FIG. 30, The inner roller 248 is positioned within the outer roller 250 to define a double roller unit 246. The outer roller 250 defines a rotating shaft 252 defined by a portion (such as from 9 to 2 o'clock) of the outer roller 250 having a circular shape. The inner roller 248 is positioned so as to co-extend with the outer roller 250 or is concentric about the same axis 252 as the outer roller 250. During the retraction of the second shade 24, The inner roller 248 rotates relative to the outer roller 250, The opposite collars in the left roller end cap 270b and the right roller end cap 270a support the respective ends of the inner roller 248. The outer roller 250 is held in a fixed rotation position relative to the inner roller 248 by a roller lock 255. The roller lock 255 is oriented such that the bearing 271 is biased by the spring 259 to be received in the anchor groove 245 (see FIGS. 28 to 30). This position of the bearing 271 prohibits the rotation of the outer roller 250. When the inner roller 248 rotates in the retracting direction, The second shade 24 is wound onto the inner roller 248, This is because it is pulled through a slot 276 formed in the outer roller 250. This retraction rotation moves the restriction nut 268 along the restriction screw 266 toward the opposite end of the restriction screw 266. The slot 276 through which the second shade 24 extends and the seat 281 for receiving the second end rail 220 are positioned on the circumference of the outer roller 250 above the attachment point 262 of the sheet 34 behind the first shade 22. This may be referred to as 3 o'clock in FIG. 30. The slot 276 is defined by opposing free edges formed in the seat 281. The seat 281 is a recess formed along the length of the groove 276, It also includes two outer edges that define the boundary of the seat 281 on the circumference of the outer roller 250. The shape of the recesses as oriented in FIG. 30 is slightly angled as a whole, One of the substantially vertically oriented base walls 284 allows a relatively vertical tangent engagement and disengagement between the second bottom rail 220 and the outer roller 250. When the second bottom rail 220 is pulled vertically upward into the seat 281 during retraction, The position of the seat 281 and the groove 276 near the farthest rear position on the circumference of the outer roller 250 together with the shape of the seat 281 allows the second bottom rail 220 to be securely received (see FIGS. 31 and 32). The shape of the seat 281 and its orientation on the outer roller 250 promote a smooth and predictable disengagement of the second bottom rail 220 from the seat 281 to begin the extension of the second shade 24 (from the position shown in FIG. 32). The shape and orientation of the seat 281 allows the bottom rail 220 to exit the seat 281 vertically, This uses the gravity on the relatively heavy bottom rail 220. The general tangential orientation of the seat 281 on the outer roller 250 helps in this regard. Referring to Figure 35, The upper wall 277a extends downward and radially inward from the top edge of the recess to a lip 277b, The lip 277b extends directly down to an upper free edge 277c. This part of the seat 281 is the deepest (as measured from the circumference toward the center of the outer roller). The lower wall 279a extends at a shallow angle upward and inward from the bottom edge of the recess, And transition to a lip 279b that defines a free edge 279c below the groove 276. The lower wall 279a is relatively vertical, And in combination with the upper lip 277b, it remains so flat. The lower free edge 279c of the slot 276 is curved or rounded to allow the second shade 24 to smoothly move above this feature when the second shade 24 is retracted onto the inner roller 248. The stable engagement of the second bottom rail 220 in the seat 281 facilitates the consistent actuation of the roller lock 255 to disengage the bearing 271 from the anchor groove 245. Referring to Figure 31, When the second shade 24 is almost completely wound around the inner roller 248, The bottom rail 220 of the second shade 24 engages the roller lock 255 to disengage the roller lock 255 from the outside of the outer roller 250. The second bottom rail 220 is shown in dotted lines in FIGS. 31 and 35. At this position, An actuator edge 247 extending axially from an end of the second bottom rail 220 contacts a pin 269 formed on the lower leg 267 of the roller lock 255. When the second bottom rail 220 is pulled into the seat 281 by retracting the second shade 24, The actuator edge 247 moves the pin 269 relative to the pivot axis of the post 253. The pin 269 moves radially inward relative to the inner roller 248, And it moves circumferentially relative to the pivot axis of the roller lock 255. The movement of the roller lock 255 around the post 253 moves the upper arm 265, At this point, the upward movement of the bearing 271 and the disengagement with the anchor groove 245, This allows the outer roller 250 to rotate freely (see Figure 32, Figure 36 and Figure 43). As shown in Figures 42 and 43, The actuator edge 247 extends away from the end of the second bottom rail 220 adjacent to the roller lock 255. Referring to FIG. 44 and FIG. 45, The edge 247 is a thin curved element that conforms to the curved shape of the bottom side of the second bottom rail 220 in this example. The edge 247 is curved along a dimension consistent with the bottom side of the second bottom rail 220, It extends axially away from the second bottom rail 220. As best seen in Figure 43, The edge 247 extends sufficiently to engage a distance of the pin 269 on the roller lock 255 without contacting the center plate 261 of the roller lock 255. The inner concave surface of the fin 247 engages the circular outer surface of the pin 269. When the second bottom rail 220 is further retracted, The pin 269 and the fin 247 maintain a sliding engagement. This further movement of the second end rail 220 causes the roller lock 255 to further pivot about the pivot axis of the post 253 and thus moves the roller lock bearing 271 away from the anchor groove 245. 32 and FIG. 36, When the second shade 24 is further retracted into the outer roller 250, The bottom rail 220 becomes firmly positioned in the seat 281 and the fins 247 move the pin 269 inward by a sufficient amount to completely remove the bearing 271 from the anchor groove 245, This allows the outer roller 250 to rotate freely. Further actuation of the operating mechanism 240 applies the rotational movement of the inner roller 248 to the outer roller 250 through the meshing of the bottom rail 220 in the seat 281 under the tension of the second shade 24. This engagement causes the outer roller 250 to rotate along with the rotation of the inner roller 248. When the outer roller 250 starts to rotate in the retracting direction, The actuator edge 247 on the second bottom rail 220 is disengaged from the pin 269 on the roller lock 255. Referring to FIG. 33 and FIG. 37, After being released, the roller lock 255 is immediately biased by the spring 259 so that the bearing 271 contacts the outer surface of the outer roller 250 at a circumferential position spaced apart from the anchor groove 245. Referring to Figure 34, When the outer roller 250 continues to rotate in the retracting direction, The first shade 22 is wound on the outer roller 250, Thereby, the anchor groove 245 is covered. When the roller lock bearing 271 is near the anchor groove 245 (when the outer roller 250 continues to rotate), The roller lock bearing 271 passes over the groove 245 by riding on the first shade 22 across the groove 245. The first shade 22 is under tension when it is wound around the outer roller 250, Therefore, the span of the shade 22 extending above the groove 245 is relatively tightened. When only a single winding of the first shade 22 is positioned above the anchor groove 245, the bearing 271 may be slightly pressed into the anchor groove 245, But after another complete rotation, the bearing 271 rides over the surface of the first shade 22 wound on the outer roller 250 without interference from the anchor groove 245. When the first shade 22 continues to retract, It is wound on the outer roller 250 multiple times, And the roller lock bearing 271 continues to ride on the outer surface of the shade 22. When the first bottom rail 18 contacts one of the abutting surfaces on the head rail housing, the double roller unit 246 reaches the top retracted position, For example. Expecting other mechanisms to define the top retracted position, A top limit stop is included that is positioned on the limit screw 266 as opposed to the bottom limit stop. As explained above, The user can actuate an operating element (manual or automatic) for the shade 22, In the case where both are retracted, the second light-shielding object 24 and the first light-shielding object 22 are retracted from the fully extended position. The restriction screw 266 is of sufficient length to allow the restriction nut 268 to restrict the movement of the stopper from the bottom until the top retracted position is obtained. The extension of the first shade 22 and the second shade 24, if desired, is done in the reverse order as described above, such as generally followed by FIGS. 34-30. This allows the user to choose whether to extend only the first shade 22 or also the second shade 24 (between fully retracted and fully extended). During the extension of the first shade 22, The user activates the operating mechanism 240 to cause the inner roller 248 to rotate in an extending direction (clockwise in FIGS. 34 to 30), This in turn causes the outer roller 250 to rotate in an extending direction. In this example, The double roller unit 246 rotates in a direction in which the user controls the inner roller 248 to rotate. When the first shade 22 extends away from the rear of the outer roller 250, The roller lock bearing 271 rides on the outer surface of the outer roller 250 until the first shade 22 extends almost completely. at this time, The outer surface of the outer roller 250 is exposed. When the outer roller 250 continues to rotate, The roller lock bearing 271 rides on the outer surface of the outer roller 250 until it meets the anchor groove 245. The bearing 271 is biased downward by the spring 259 to be positioned in the groove 245 and prohibits the rotation of the outer roller 250 and allows the inner roller 248 to continue to rotate (if desired by the user). Because the roller lock 255 is biased in one direction against the outer surface of the outer roller 250, The bearing 271 therefore moves into the anchor groove 245 without further advancement. At this time, the first light-shielding object 22 is at its most extended position across the opening. It is contemplated that in these examples, the roller lock 255 may be biased by a member other than a spring 259. For example, The top arm 273 of the roller lock 255 may be weighted so that the roller lock 255 automatically pivots as desired under the weight of the top arm 273. In the case of using a spring 259, It can be tied to a wire spring, Coil spring, Elastic material springs (such as rubber, Rubber and / or plastic) or the like. When the bearing 271 of the roller lock 255 is seated in the anchor groove 245, The slot 276 in the outer roller 250 is rotatably oriented in the head rail 14 so that when the tension in the second light shield 24 is reduced by the operating system 240, the bottom rail 220 of the second light shield 24 can exit vertically. Block 281. The substantially tangential orientation and substantially vertical positioning of the seat 281 and a relatively vertical base wall 284 allows the weight of the second bottom rail 220 to be released from the seat 281 when the tension in the second shade 24 is released in the retracted position. 220 is effective. however, If the user does not intend to extend the second shade 24, Then, the second shade 24 can be kept retracted. The operating mechanism 240 may include a brake system to restrict the unwanted downward movement of the second shade 24 or the first shade 22. To extend the second shade 24, The operating system 240 is further actuated to a level desired by the user. When the user extends the second shade 24 to the lowest position (maximum extension), The limiting nut 268 is positioned on the limiting screw 266 to mesh with the lower limit stop. Therefore, a single limit screw 266 can be used to define the upper limit of the retracted first shade 22 attached to the outer roller 250, The lower limit of the extended second shade 24 attached to the inner roller 248 is defined. It is expected that the first shade 22 of FIGS. 30 to 34 (which may be the same as or different from the first shade shown in FIGS. 1 to 5) may be wound on the outer roller 250 or deployed from the front side of the outer roller 250. The accompanying modifications to the structure described in this article will be necessary to facilitate the implementation of the double-roller shade technology as applied to a front-down shade structure. It is also expected that The right end of the head rail can be combined with the right end cap 226a to adopt the roller lock mechanism and the accompanying components necessary for its operation. Together with a roller lock mechanism on the left end of the head rail or itself. In addition, The second bottom rail 220 may have a consistent moving edge 247 on either end thereof. The foregoing description has wide applications. Although the examples provided illustrate a silhouette type shade and a black barrier type shade, However, it should be understood that the concepts disclosed in this article are equally applicable to many types of shades. therefore, The discussion of any embodiment is intended to be illustrative only and not intended to suggest that the scope of the invention encompassing the scope of the patent application is limited to these examples. In other words, Although illustrative embodiments of the invention have been described in detail herein, It should be understood, These inventive concepts can be embodied and adopted differently, And the scope of the attached patent application is intended to be understood to include such variations, Except where limited by prior art. The foregoing discussion has been presented for purposes of illustration and description, and is intended to limit the invention to one or more of the forms disclosed herein. For example, For the purpose of simplifying the invention, one or more aspects, Various features of the invention are grouped together in an embodiment or configuration. however, It should be understood that Combination of certain aspects of the invention in embodiments or configurations, Various features of the embodiment or configuration. In addition, The following patent application scope is hereby incorporated into this embodiment by this reference, Each of these claims is independently a separate embodiment of the present invention. As used in this article, the phrase "at least one", "One or more" and "and / or" are open-ended expressions that are operationally both conjunctions and disjunctive conjunctions. The term "a" or "an" as used herein refers to one or more of its entities. As such, The term "a (an or an)", "One or more" and "at least one" are used interchangeably herein. All directional references (e.g., Near end, remote, Upper, Lower part, up, down, left, right, Sideways, Vertical, Front part, rear, top, bottom, Above, below, vertical, Level, Radial, Axial, (Clockwise and counterclockwise) are used only for identification purposes to help the reader understand the present invention, And does not form (specifically) as to the position of the invention, Restrictions on targeting or use. Unless otherwise instructed, Otherwise connect the reference (for example, Attach, coupling, Connections and joints) are to be interpreted broadly and may include intermediate parts between a set of elements and relative movement between elements. As such, The connection reference does not necessarily infer that the two components are directly connected and in a fixed relationship to each other. Identify references (for example, main, secondary, the first, second, third, Fourth class) is not intended to imply importance or priority, It is used to distinguish features from each other. The drawings are for illustration purposes only and the dimensions, position, The order and relative size can vary.

10‧‧‧ retractable cover / cover / motorized cover

14‧‧‧Head rail

18‧‧‧ the first bottom rail / bottom rail

20‧‧‧Second bottom rail / bottom rail / relative bottom rail

22‧‧‧first shade

24‧‧‧Second shade

24a‧‧‧Right edge

24b‧‧‧Left edge

26a‧‧‧End Cap / Right End Cap

26b‧‧‧End Cap / Left End Cap

30‧‧‧ front sheet / sheet

34‧‧‧back sheet / sheet

38‧‧‧ Horizontally extending vertical spaced flexible blades / blades

40‧‧‧Drive or operating mechanism / operating mechanism / operating element

42‧‧‧Operating elements

44‧‧‧ Electric motor / motor

46‧‧‧Remote Control Unit / Double Roller Unit / Roller Unit

48‧‧‧Inner roller / roller

50‧‧‧Outer roller / roller

52‧‧‧Rotary shaft / longitudinal extension recess

54‧‧‧First case / case

56‧‧‧Second shell / shell

58‧‧‧ Longitudinal extended edge portion / first end portion / end portion

60‧‧‧ Longitudinal extended edge portion / first end portion

62‧‧‧passage / attachment point

64‧‧‧Inserts / Internal Accessories / Accessories

66‧‧‧Restriction Screw / Thread Restriction Screw / Screw

68‧‧‧limit nut / nut

70a‧‧‧Right casing / casing

70b‧‧‧Left casing / Sleeve

72a‧‧‧ protrusion / axial protrusion

72b‧‧‧ protrusion / axial protrusion

74‧‧‧shelf

76‧‧‧slot

78‧‧‧Second longitudinally extending edge portion / second edge portion / edge portion

80‧‧‧Second longitudinally extending edge portion / second edge portion / edge portion

81‧‧‧ seat / recessed seat

82‧‧‧ Insert

84‧‧‧ generally vertically oriented basement wall / basement wall / relative vertical basement wall

110‧‧‧ Cover

126a‧‧‧Right end cap / end cap

126b‧‧‧Left end cap / end cap

146‧‧‧Double roller unit

148‧‧‧Inner roller

150‧‧‧ outer roller

152‧‧‧rotation axis

154‧‧‧First case / case

156‧‧‧Second shell / shell

158‧‧‧end portion / edge portion / second end edge portion

160‧‧‧end portion / edge portion / second end edge portion

166‧‧‧ Non-rotatable restriction screw / restriction screw

167‧‧‧Boss

168‧‧‧Limiting nut / internal limiting nut

170a‧‧‧Right casing / casing

170b‧‧‧Left casing / casing

172a‧‧‧ axial protrusion

172b‧‧‧ axial protrusion

176‧‧‧longitudinal extension groove / slot

178‧‧‧End edge part / edge part

180‧‧‧End edge part / edge part

186‧‧‧Axially movable lock mechanism / lock mechanism

187‧‧‧shell

187a‧‧‧end / end section

187b‧‧‧Free end / end part

187c‧‧‧Middle

188‧‧‧rotatable shaft / shaft

189‧‧‧nut / half nut / external nut

190‧‧‧Fastener

191‧‧‧Axial extension collar / collar

192‧‧‧ Butt flange

193‧‧‧Inner wall / bearing surface

194‧‧‧ Pore of shaft

195‧‧‧ journal

196‧‧‧Keyhole

197‧‧‧Stopper / Stopper that extends outwards / Shaft stopper

198‧‧‧ substrate

199‧‧‧rail

200‧‧‧ Pore / Stopper Receiving Pore

201‧‧‧Stiffeners / longitudinal extension ribs

202‧‧‧ Horizontally extending buttress

203‧‧‧Threaded part

204‧‧‧Gear / Second Gear / External Gear

205‧‧‧Subject

206‧‧‧Internal thread

207‧‧‧longitudinal extension wing

208‧‧‧ axially extending fins / grooves

209‧‧‧ horizontally extending rib

211‧‧‧longitudinal extension butt wall / butt wall

213‧‧‧Gear mechanism / gear train

215‧‧‧first gear / external gear / gear

217‧‧‧Idle gear / external gear / gear

219‧‧‧Mounting plate

220‧‧‧Second bottom rail / bottom rail / second rail / second end rail / relatively heavy bottom rail

221‧‧‧Positioner pin

223‧‧‧side

225‧‧‧Clamp

226a‧‧‧Right end cap / end cap

226b‧‧‧Left end cap

227‧‧‧Interlocking Zone

229‧‧‧Receiving channel

231‧‧‧Receiving channel

233‧‧‧Lip / Lip

235‧‧‧Lip / Lip

237‧‧‧End longitudinally extending edge

239‧‧‧End longitudinally extending edge

240‧‧‧Operating mechanism / operating system

241‧‧‧External detent

242‧‧‧Operating elements

243‧‧‧External detent

245‧‧‧anchor groove / groove

246‧‧‧Double Roller Unit

247‧‧‧Actuator side / side / fin

248‧‧‧Inner roller / roller / inner roller tube / inner tube

248a‧‧‧Right end

248b‧‧‧left end

249‧‧‧Pivot bracket

250‧‧‧Outer roller / roller / outer tube

250a‧‧‧ right end

250b‧‧‧left end

251‧‧‧ Centrally located annular boss

252‧‧‧rotation axis / longitudinal center axis / axis

253‧‧‧columns

255‧‧‧roller lock

257‧‧‧Fastener

259‧‧‧Spring / Spring Parts

261‧‧‧frame board / board / center board

262‧‧‧channel / internal cavity / engagement point / attachment point

263‧‧‧center body

264‧‧‧Internal Accessories / Accessories / Inserts

265‧‧‧Upper leg / outrigger / upper arm

266‧‧‧Restriction Screw / Thread Restriction Shaft

267‧‧‧Lower Outrigger / Outrigger

268‧‧‧limiting nut

269‧‧‧pin

270a‧‧‧Right end roller cap

270b‧‧‧Left outer roller cap / cap

271‧‧‧ Relatively long cylindrical bearing / bearing / roller lock bearing

273‧‧‧arm / top arm

275‧‧‧ Gland / Rib

276‧‧‧slot

277a‧‧‧upper wall

277b‧‧‧lip / upper lip

277c‧‧‧Upper free edge

279a‧‧‧lower wall

279b‧‧‧lip

279c‧‧‧Lower free edge

281‧‧‧ seat / recessed seat

284‧‧‧ generally vertically oriented basement wall / relatively vertical basement wall

286‧‧‧lock mechanism

7-7‧‧‧line

8-8‧‧‧line

9-9‧‧‧line

10-10‧‧‧line

11-11‧‧‧line

14-14‧‧‧line

27-27‧‧‧line

30-30‧‧‧line

31-31‧‧‧line

34-34‧‧‧line

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate examples of the invention and, together with the general description given above and the detailed description given below, serve to explain the principles of the invention. FIG. 1 is an isometric view of a cover in which a first shade and a second shade are in a fully retracted position according to some examples of the present invention. FIG. 2 is an isometric view of the covering of FIG. 1 with a first shade in a partially extended position and a second shade in a fully retracted position according to some examples of the present invention. FIG. 3 is an isometric view of the covering of FIG. 1 with a first shade in a fully extended position and a second shade in a fully retracted position according to some examples of the present invention. FIG. 4 is an isometric view of the covering of FIG. 1 with a first shade in a fully extended position and a second shade in a partially extended position according to some examples of the present invention. FIG. 5 is an isometric view of one of the coverings of FIG. 1 with a first shade and a second shade in a fully extended position according to some examples of the present invention. Figure 6 is an exploded isometric view of a head rail assembly of a cover according to one of some examples of the present invention. The head rail cover and the first and second shades are not shown for clarity. FIG. 7 is a longitudinal sectional view of a covering having the head rail assembly of FIG. 6 taken along line 7-7 of FIG. 1 according to some examples of the present invention. 8 is a cross-sectional view of a cover having a head rail assembly of FIG. 6 taken along line 8-8 of FIG. 2 according to some examples of the present invention. FIG. 9 is a cross-sectional view of a covering having a head rail assembly of FIG. 6 taken along line 9-9 of FIG. 3 according to some examples of the present invention. 10 is a cross-sectional view of a covering having a head rail assembly of FIG. 6 taken along line 10-10 of FIG. 4 according to some examples of the present invention. 11 is a cross-sectional view of a covering having a head rail assembly of FIG. 6 taken along line 11-11 of FIG. 5 according to some examples of the present invention. FIG. 12 is an isometric view of a head rail assembly of a cover according to some examples of the present invention. The head rail cover is not shown for clarity. 13 is an exploded isometric view of one of the head rail assemblies of FIG. 12 according to some examples of the present invention. FIG. 14 is a cross-sectional view of one of the head rail assemblies of FIG. 12 taken along line 14-14 of FIG. 12 according to some examples of the present invention. Fig. 15 is a side elevation view of one of some of the head rail assemblies of Fig. 12 according to some examples of the present invention, showing three of the end caps rotatably supported on one of the covers Interlocking gears. 16 is an isometric view of a lock mechanism of the head rail assembly of FIG. 12 according to some examples of the present invention. Fig. 17 is a side elevation view of one of the lock mechanisms of Fig. 16 according to some examples of the present invention. Fig. 18 is another isometric view of the lock mechanism of Fig. 16 according to some examples of the present invention. 19 is a side elevation view of one of the dual roller units attached to the lock mechanism of FIG. 16 according to some examples of the present invention. 20 is a detailed view of a locking interface between a first housing and a second housing of an outer roller of the double roller unit of FIG. 19 according to some examples of the present invention. 21 is a front elevation view of one of the housings of the lock mechanism of FIG. 16 according to some examples of the present invention. Fig. 22 is a side elevation view of one of the cases of Fig. 21 according to some examples of the present invention. Fig. 23 is a shaft member of the lock mechanism of Fig. 16 according to some examples of the present invention. Fig. 24 is an isometric view of a nut of one of the lock mechanisms of Fig. 16 according to some examples of the present invention. Fig. 25 is another isometric view of the nut of Fig. 24 according to some examples of the present invention. FIG. 26 is a front elevation view of one of the shaft member of FIG. 23 rotatably supported in the housing of FIG. 21 and the nut of FIG. 24 screwed to the shaft member according to some examples of the present invention. The housing and nut are shown in longitudinal section. FIG. 27 is a cross-sectional view of one of the housing, nut, and shaft member of FIG. 26 taken along line 27-27 of FIG. 26 according to some examples of the present invention. FIG. 28 is an isometric exploded view of a head rail assembly of a cover according to some examples of the present invention. The head rail cover and the second shade are not shown for clarity. Fig. 29 is another isometric exploded view of the head rail assembly of Fig. 28 according to some examples of the present invention. 30 is a cross-sectional view of a covering having the head rail assembly of FIG. 28 taken along line 30-30 of FIG. 5 according to some examples of the present invention. FIG. 31 is a cross-sectional view of a covering having the head rail assembly of FIG. 28 taken along line 31-31 of FIG. 3 according to some examples of the present invention. FIG. 32 is a cross-sectional view of a covering of FIG. 31 according to some examples of the present invention, in which a bottom rail is seated against an outer roller and a locking mechanism is disengaged from the outer roller. FIG. 33 is a cross-sectional view of one of the covers of FIG. 32 in which the outer roller is rotated counterclockwise relative to the position of the outer roller in FIG. 32 according to some examples of the present invention. 34 is a cross-sectional view of a covering having the head rail assembly of FIG. 28 taken along line 34-34 of FIG. 4 according to some examples of the present invention. FIG. 35 is a cross-sectional view of one of the covers of FIG. 31 according to some examples of the present invention, with the inner roller and the second shade removed for clarity. FIG. 36 is a cross-sectional view of one of the covers of FIG. 32 according to some examples of the present invention, with the inner roller and the second shade removed for clarity. FIG. 37 is a cross-sectional view of one of the covers of FIG. 33 with the inner roller and the second shade removed for clarity, according to some examples of the present invention. Fig. 38 is an isometric view of a locking mechanism of the head rail assembly of Fig. 28 according to some examples of the present invention. Fig. 39 is another isometric view of the lock mechanism of Fig. 38 according to some examples of the present invention. FIG. 40 is an isometric view of a bracket of the head rail assembly of FIG. 28 according to some examples of the present invention. FIG. 41 is an isometric view of one of the locking mechanisms of FIG. 38 rotatably mounted to the bracket of FIG. 40 according to some examples of the present invention. FIG. 42 is an isometric view of a fragment of some of the head rail assemblies of FIG. 28 according to some examples of the present invention and illustrates the interface between the lock mechanism of FIG. 38 and a bottom rail of the cover. FIG. 43 is an isometric view of a fragment of some of the head rail assemblies of FIG. 28 according to some examples of the present invention and illustrates the interface of the locking mechanism of FIG. 38 and a bottom rail of the cover. 44 is a fragmentary view of one end of the bottom rail of FIGS. 42 and 43 according to some examples of the present invention. FIG. 45 is an isometric view of one of the actuator sides of the bottom rail of FIG. 44 according to some examples of the present invention. 46 is a longitudinal cross-sectional view of one end of a cover having the head rail assembly of FIG. 28 taken along line 7-7 of FIG. 1 according to some examples of the present invention. 47 is a longitudinal cross-sectional view of the other end of a cover having the head rail assembly of FIG. 28 taken along line 7-7 of FIG. 1 according to some examples of the present invention.

Claims (36)

A covering for a building opening, comprising: an outer roller having a first end, a second end, a ring-shaped outer surface extending between the first end and the second end, A central longitudinal axis and an elongated groove formed through the annular outer surface, the elongated groove extending from the first end to the second end of the outer roller; an inner roller having a central longitudinal axis, And accommodated in the outer roller; a first shade which is adapted to be wound around the outer roller, the first shade being retractable between the retracted position and an extended position on the outer roller A second light-shielding object adapted to be wound on the inner roller, the second light-shielding object extending through the elongation slot and between a retracted position and an extended position; Retracted on the inner roller and extendable from the inner roller; wherein, when the first light-shielding object is in the extended position, the first light-shielding object passes along a central longitudinal axis passing through the inner roller and the outer roller The central longitudinal axis extends on a plane. As in the covering of claim 1, wherein the second shade is offset axially rearward from the centers of the first shade and the inner and outer rollers, and is in length and width from the first shade Extending together. As in the covering of claim 1, wherein when the elongated groove is positioned to extend the second shade, the elongated groove is aligned substantially horizontally with a rotating shaft system of the inner and outer rollers so that the second shade To the extended position between the first shade and the opening of the building. The covering according to claim 3, wherein the first shade includes: a front sheet, a rear sheet, and a blade extending between the front and rear sheets. The covering of claim 4, wherein the second shade is positioned between the rear sheet of the first shade and the opening of the building. As in the covering of claim 1, wherein when the first shade is in the extended position, the elongated groove is positioned near a farthest rear position on the annular outer surface of the outer roller. As the cover of claim 1, wherein the first shade is coupled to the outer roller at an attachment point; and when the first shade is in the extended position, the extension groove is positioned in the first Above the attachment point of the shading object and on the ring-shaped outer surface of the outer roller between the first shading object and the building opening. A covering for a building opening, comprising: an outer roller having a first end, a second end, a ring-shaped outer surface extending between the first end and the second end, A central longitudinal axis and an elongated groove formed through the annular outer surface, the elongated groove extending from the first end to the second end of the outer roller; an inner roller having a central longitudinal axis, And accommodated in the outer roller; a first shade which is adapted to be wound around the outer roller, the first shade being retractable between the retracted position and an extended position on the outer roller The first shade is movable between an open configuration and a closed configuration; a second shade is adapted to be wound on the inner roller, the first shade is Two shades extend through the elongated slot and can be retracted on the inner roller between a retracted position and an extended position and can extend from the inner roller; wherein, when the first shade is in the extended position And in this closed configuration, it is allowed to penetrate through the cover A first level of light transmission; when the first shade is in the extended position and in the open configuration, a second level of light passing through the cover may be allowed to transmit, the second position The quasi-light transmission is greater than the first-level light transmission; and when the second shade is in the extended position, a third-level light transmission through the cover is allowed, the third level The light transmission is smaller than the light transmission of the first and second levels. As in the covering of claim 8, wherein the inner roller and the outer roller are rotated around a single rotation axis; and when the extension groove is positioned to extend the second shade, the extension groove and the inner and outer rollers The rotating shaft system is aligned substantially horizontally. The covering according to claim 8, wherein when the first shade is in the extended position, the extension groove is positioned near a farthest rear position on the annular outer surface of the outer roller. If the covering of claim 8, wherein the first shade includes a front sheet, a rear sheet, and a blade extending between the front sheet and the rear sheet, the front and back sheets of the first shade are The blade is made of a transparent material, and the blade is made of an opaque material. The covering as claimed in claim 11, wherein the second shade is made of a single sheet of material having zero light transmittance. As in the covering of claim 11, wherein: in the closed configuration, the blade extends perpendicularly to one of the front sheet and the rear sheet in a co-planar, connected relationship to block penetration from the front sheet and the Light from the rear sheet; and in the open configuration, the blade extends horizontally so that light passes through the front sheet and the rear sheet. As in the covering of claim 11, wherein: the front and rear sheets of the first shade are attached to the outer roller at a ring-shaped spacing point on the opposite side of the outer roller; and the second shade A rear side of the inner roller and the outer roller between the first shade and the building opening extends through the elongated slot in the outer roller to move into the extended position. As in the covering of claim 11, wherein the front and rear sheets are attached to the outer roller at the same height, and when the first shade is in the extended position, the front and rear sheets are flush with each other. The covering according to claim 8, wherein the second shade is offset backward from the first shade and extends with the first shade in a length and a width. A covering for a building opening, comprising: an outer roller having a first end, a second end, a ring-shaped outer surface extending between the first end and the second end, A central longitudinal axis and an elongated groove formed through the annular outer surface, the elongated groove extending from the first end to the second end of the outer roller; an inner roller having a central longitudinal axis, And accommodated in the outer roller; a first shade which is adapted to be wound around the outer roller, the first shade being retractable between the retracted position and an extended position on the outer roller And can extend from the outer roller; a second shade is adapted to be wound on the inner roller, the second shade extends through the extension slot and can be between a retracted position and an extended position Retractable on the inner roller and extending from the inner roller; and wherein the outer roller and the inner roller are coaxially aligned with a rotation axis and concentric with the central longitudinal axis of the inner roller. As in the covering of claim 17, wherein the first shade is movable between a closed configuration and an open configuration, so that: when the first shade is in the extended position and in the closed configuration The first light-shielding object transmits a first-level light through the cover; when the first light-shielding object is in the extended position and in the open configuration, the first light-shielding object makes a second position Light transmission through the cover, the light transmission at the second level is greater than the light transmission at the first level; and when the first light shield is in the extended position and in the open configuration, and The second light-shielding object is in the extended position, and a third level of light transmitted through the cover may be allowed to transmit. The third level of light transmission is smaller than the first and second levels of light. transmission. If the covering of claim 18, wherein the first shade includes a front sheet, a back sheet, and a leaf extending between the front sheet and the back sheet, the front and back sheets of the first shade are The blade is made of a transparent material, and the blade is made of an opaque material. The covering of claim 18, wherein the second shade is made of a single sheet of material having zero light transmittance. The covering of claim 18, wherein: in the closed configuration, the blade extends perpendicularly to one of the front sheet and the rear sheet in a connected relationship to prevent penetration from the front sheet and the Light from the rear sheet; and in the open configuration, the blade extends horizontally so that light passes through the front sheet and the rear sheet. If the covering of claim 18, wherein: the front and rear sheets of the first shade are attached to the outer roller at a ring-shaped spaced point on the opposite side of the outer roller; and the second shade It is configured to pass through the elongated groove from a rear side of the inner and outer rollers to move into the extended position. The covering of claim 22, wherein the second shade is offset rearward from the first shade and extends along the length and width of the first shade. As in the covering of claim 22, wherein the front and rear sheets are attached to the outer roller at the same height, and when the first shade is in the extended position, the front and rear sheets are flush with each other. The covering of claim 22, wherein when the elongated groove is positioned to extend the second shade, the elongated groove is aligned substantially horizontally with the rotation axis of the inner roller and the outer roller. The covering according to claim 17, wherein the second shade is offset backward from the first shade and extends in coexistence with the first shade in length and width. If the covering of claim 26, wherein the inner roller comprises a first end and a second end, the first end and the second end of the inner roller are respectively the first end and the second end of the outer roller The ends are substantially aligned, so that a length of the inner roller is substantially the same as a length of the outer roller, and a width of the first shade is substantially the same as a width of the second shade. The covering of claim 17, further comprising a bottom rail coupled to the second shade, wherein when the first shade is in the extended position, the bottom rail of the second shade is lowered vertically A seat formed in the outer roller is released. If the covering of claim 17 further comprises a speed control device to control or adjust the extension or reduction speed of the first and second shades. The covering of claim 17, wherein when the first shade is in the extended position, the elongated groove is positioned near a farthest rear position on the annular outer surface of the outer roller. As in the covering of claim 17, wherein the first shade is coupled to the outer roller at an attachment point; and when the first shade is in the extended position, the extension groove is positioned in the first The ring-shaped outer surface of the outer roller above the attachment point of the shade. For example, the covering of claim 17 further includes an operating mechanism for selectively rotating the first shade, wherein when the first shade is rotated to the extended position, the second shade is affected by a gravity Without further input from the operating mechanism, the operator extends from the retracted position to the extended position of the second shade. A covering for a building opening, comprising: a rotatable outer roller; a first shade that is fixed to the outer roller and can be wound around the outer roller; a rotatable shaft member positioned on the outer roller The outer roller at least partially defines a bottom stopper of the first shade; a rotatable inner roller is received in the outer roller; a second shade is fixed to the inner roller and can be wound On the inner roller; and a non-rotatable shaft member extending inside the inner roller and at least partially defining a bottom stopper of the second shade. A method for operating a covering for a building opening, comprising: unfolding a first shade from a periphery of an outer roller; and after the first shade reaches a fully extended position, it immediately positions itself on the A second light-shielding object is deployed around a periphery of an inner roller of the outer roller; wherein the second light-shielding object is extended to extend through the second light-shielding object formed in the outer roller and positioned with a center of the inner roller The longitudinal axis is aligned substantially horizontally with one of the elongated slots. The method of claim 34, further comprising: pivoting a locking member into locking engagement with the outer roller to lock rotation of the outer roller; rotating the inner roller relative to the outer roller to allow the second shade to pass through Retracting to the inner roller through the elongated groove formed in the outer roller; pivoting the locking member out of the locked engagement with the outer roller at a fully retracted position of the inner roller to allow the outer roller Rotating; and rotating the outer roller by driving the inner roller to retract the first shade to the outer roller. The method of claim 34, further comprising: axially moving a locking member outside the periphery of the outer roller during the extension of the first shade, when the first shade reaches the fully extended position Then the rotation of the outer roller is restricted by the locking member immediately; during the extension of the second shade, an nut positioned in the inner roller is axially traversed; and when the second shade reaches a fully extended position Then, the rotation of the inner roller is restricted by the nut.