A retractable blind system

Abstract

A retractable blind system includes a fabric with a first longitudinal fabric end and a second longitudinal fabric end, a fabric barrel connected to the first longitudinal fabric end and configured to store the fabric as a roll, a hem bar connected to the second longitudinal fabric end, a fabric barrel drive system configured to move the fabric between a first fabric retracted position and a plurality of different second fabric extended positions, and a hem bar locking mechanism configured to selectively engage and lock the hem bar in the plurality of different second fabric extended positions.

Description

[0001] A retractable blind system

[0002] Field

[0003] The technology relates to the field of window coverings, specifically retractable blind systems for controlling light and privacy in residential, commercial, and industrial settings.

[0004] Background

[0005] Roller blinds are a popular window covering solution used in residential, commercial, and industrial settings. They consist of a fabric material that is wound around a roller tube, also known as a fabric barrel, and can be extended or retracted to cover or uncover a window or other opening. The fabric is typically attached to a rigid bar, known as a hem bar or bottom bar, at its unrolled edge. The hem bar serves two main functions: it provides a means to exert uniform force along the width of the bottom of the blind fabric, and it helps to keep the bottom edge of the fabric flat.

[0006] The position of the hem bar along the travel of the blind is usually determined by the force exerted by gravity and / or a spring force, and the reactive force exerted by the tension within the fabric. In some applications, it is desirable to adjust the tension in the fabric independently of the position of the hem bar, for example, to accommodate various deployment levels without altering the fabric's appearance or functionality. However, traditional roller blind systems do not allow for such independent adjustment of fabric tension and hem bar position.

[0007] In addition, roller blinds may be used in outdoor applications or in environments where they are exposed to external forces, such as wind. In these situations, it is important to ensure that the hem bar remains in a set position despite the external forces that could otherwise move it.

[0008] Furthermore, achieving high fabric tension without relying on the weight of the hem bar or the strength of a spring can be problematic in situations where space constraints limit the size and weight of the hem bar or the spring, or where the desired aesthetic requires a tension that exceeds the capabilities of these components.

[0009] Some prior art systems as shown in US 9,909,364 have attempted to address the issue of locking the hem bar in a pre-defined fully deployed position using latching mechanisms. However, this may be problematic if the user only wants to partially deploy the blind.

[0010] Summary

[0011] According to a first aspect of the disclosure, a retractable blind system is provided. This system comprises a fabric having a first longitudinal fabric end and a second longitudinal fabric end. A fabric barrel is connected to the first longitudinal fabric end and is configured to store the fabric as a roll. A hem bar is connected to the second longitudinal fabric end. A fabric barrel drive system is configured to move the fabric between a first fabric retracted position and a plurality of different second fabric extended positions. A hem bar locking mechanism is configured to selectively engage and lock the hem bar in the plurality of different second fabric extended positions. This configuration allows for the hem bar to be locked in a plurality of different positions. This means that the tension of the fabric can be adjusted independent of the position of the hem bar.

[0012] Optionally in some examples, the hem bar locking mechanism comprises at least one locking assembly moveable between a locked position and a released position.

[0013] Optionally in some examples, the at least one locking assembly is a first locking assembly which comprises a first moveable locking gate positioned on a first lateral side of the fabric and a second locking assembly which comprises a second moveable locking gate positioned on a second lateral side of the fabric. This configuration ensures that the hem bar is locked in place on both sides of the fabric, providing stability and preventing the fabric from sagging or becoming misaligned.

[0014] Optionally in some examples, the first moveable locking gate comprises a plurality of first locking recesses and the second moveable locking gate comprises a plurality of second locking recesses. This feature allows for multiple locking positions, providing the user with a range of options for the position of the fabric.

[0015] Optionally in some examples, the hem bar comprises a first engagement element configured to engage with the first locking recess when the at least one locking assembly is in the locked position, and a second engagement element configured to engage with the second locking recess when the at least one locking assembly is in the locked position. This configuration ensures a secure engagement between the hem bar and the at least one locking assembly, preventing the hem bar from slipping or becoming dislodged.

[0016] Optionally in some examples, each of the first locking recess and the second locking recess comprises a chamfered edge. This feature facilitates smooth engagement and disengagement of the at least one locking assembly with the hem bar.

[0017] Optionally in some examples, the retractable blind system further comprises a locking actuator operatively coupled to the at least one locking assembly and configured to move the at least one locking assembly between the locked position and the released position. This feature provides the advantage of automating the locking and unlocking process, making the retractable blind system easier and more convenient to use.

[0018] Optionally in some examples, the retractable blind system further comprises a control unit connected to the locking actuator and configured to send a control signal to the locking actuator to move the at least one locking assembly between the locked position and the released position. This feature allows for remote control of the retractable blind system, providing the user with the ability to adjust the position of the fabric from a distance.

[0019] Optionally in some examples, the control unit is further configured to issue a control signal to the fabric barrel drive system to change the tension in the fabric when the hem bar locking mechanism is in the locked position. This feature allows for independent adjustment of the tension of the fabric, providing the user with the ability to control the amount of light passing through the fabric. Optionally in some examples, the retractable blind system further comprises a communication module configured to facilitate communication between the control unit and remote devices. This feature allows for integration with smart home systems, providing the user with the ability to control the retractable blind system from a variety of devices.

[0020] Optionally in some examples, the communication module is selected from the group consisting of a Wi-Fi module, a Bluetooth module, an RFID module, and a Zigbee module.

[0021] Optionally in some examples, the fabric comprises a variable aperture material configured to adjust the amount of light passing through the fabric in dependence of the tension applied to the fabric by the fabric barrel drive system. This feature provides the advantage of adjustable light control, allowing the user to control the amount of light entering the room.

[0022] Optionally in some examples, the fabric barrel drive system comprises a motor configured to rotate the fabric barrel to move the fabric between the first fabric retracted position and the plurality of different second fabric extended positions.

[0023] Optionally in some examples, the first locking assembly comprises a plurality of first moveable locking gates positioned on a first lateral side of the fabric and second locking assembly which comprises a plurality of second moveable locking gates positioned on a second lateral side of the fabric.

[0024] Optionally in some examples, the plurality of first moveable locking gates and the plurality of second moveable locking gates are each operatively connected to an actuator plate.

[0025] Optionally in some examples, the plurality of first moveable locking gates and the plurality of second moveable locking gates are pivotable between the locked position and the released position wherein the pivot axes of the plurality of first moveable locking gates and the plurality of second moveable locking gates is perpendicular to a fabric longitudinal axis and a rotational axis of the fabric barrel. Optionally in some examples, the hem bar is arranged to engage and move the at least one locking assembly from the locked position to the released position when the hem bar moves in a direction away from the first fabric retracted position.

[0026] According to a second aspect of the disclosure, a method of locking a hem bar in a retractable blind system is provided. The method comprises moving the fabric mounted on a fabric barrel from a first fabric retracted position to a plurality of different second fabric extended positions and engaging the hem bar locking mechanism to lock the hem bar in the plurality of different second fabric extended positions.

[0027] Optionally in some examples, the method comprises adjusting a tension of the fabric by rotating the fabric barrel whilst the hem bar is locked in the second fabric extended position, and modifying the opacity of the fabric in dependence of adjusting the tension of the fabric whilst the hem bar is locked in the second fabric extended position.

[0028] Brief Description of the Drawings

[0029] Examples are described in more detail below with reference to the appended drawings. Figure 1 is a front view of the retractable blind system according to some examples;

[0030] Figure 2 provides a close-up front view of the retractable blind system according to some examples;

[0031] Figure 3 presents a close-up perspective view of the retractable blind system according to some examples;

[0032] Figure 4 is a schematic view of the retractable blind system according to some examples;

[0033] Figure 5a shows a schematic plan close-up view of the hem bar locking mechanism using a linear actuator in a locked position according to some examples;

[0034] Figure 5b shows a schematic plan close-up view of the hem bar locking mechanism using a linear actuator in a released position according to some examples;

[0035] Figure 6a shows a schematic plan close-up view of the hem bar locking mechanism using a locking motor in a locked position according to some examples;

[0036] Figure 6b shows a schematic plan close-up view of the hem bar locking mechanism using a locking motor in a released position according to some examples, Figures 7a and 7b show a cross-sectional side view of a hem bar locking mechanism respectively in an unlocked position and a locked position according to some examples;

[0037] Figures 8a and 8b show another cross-sectional side view of a hem bar locking mechanism with a plurality of locking positions according to some examples, and Figures 9a and 9b show a cut away perspective view of a hem bar locking mechanism as shown in Figures 7a and 7b respectively.

[0038] Detailed Description

[0039] Figure 1 illustrates a retractable blind system 100. The retractable blind system 100 is designed to control the amount of light entering a room by adjusting the position and tension of a fabric 102. The retractable blind system 100 includes several components that work together to provide a user with the ability to easily and precisely control the position and tension of the fabric 102. These components include a fabric barrel 134, a hem bar 164, a fabric barrel drive system 106, and a hem bar locking mechanism 110. Specifically, these components allow for the hem bar 164 to be locked in a plurality of different positions. This means that the tension of the fabric 102 can be adjusted independent of the position of the hem bar 164. This will be discussed in more detail below.

[0040] The retractable blind system 100 is designed to be mounted within a window or door frame, or any other suitable location. The retractable blind system 100 may be mounted indoors or alternatively outdoors. In some examples the retractable blind system 100 is arranged to be mounted on a vertical surface e.g. parallel with the plane of a window or a wall. In other examples the retractable blind system 100 is arranged to be mounted on a horizontal surface or a surface inclined to a horizontal or vertical surface. The retractable blind system 100 is configured to move the fabric 102 between a first fabric retracted position 130 and a plurality of different second fabric extended positions 132. The movement of the fabric 102 is controlled by the fabric barrel drive system 106, which is operatively connected to the fabric barrel 134. The fabric barrel 134 is configured to store the fabric 102 as a roll, allowing the fabric 102 to be easily extended and retracted. The hem bar 164 is connected to the second longitudinal fabric end 122 of the fabric 102. The hem bar 164 provides a means to exert uniform force along the width of the bottom of the fabric 102, keeping the bottom edge of the fabric flat. The hem bar 164 is selectively engaged and locked in a plurality of different second fabric extended positions 132 by the hem bar locking mechanism 110. This allows the user to precisely control the position of the fabric 102.

[0041] In some implementations, the fabric 102 is optionally made from a variable aperture material. This material is designed to uniformly stretch in the direction of the fabric longitudinal axis 142 of the fabric 102. The variable aperture material can adjust the amount of light passing through the fabric 102 in dependence of the tension applied to the fabric 102 by the fabric barrel drive system 106. This allows the user to not only control the position of the fabric 102, but also the amount of light that is allowed to pass through the fabric 102. In other examples, the fabric 102 is not a variable aperture material. In this case the fabric 102 does not change the amount of light passing through the fabric 102 in dependence of the tension applied to the fabric 102. For example, the fabric 102 can optionally be made from any flexible or rollable material, including but not limited to polyester, cotton, linen, acrylic, fibreglass, and vinyl.

[0042] The fabric 102 as shown in Figure 1 has a first longitudinal fabric end 124 and a second longitudinal fabric end 122. The first longitudinal fabric end 124 is connected to the fabric barrel 134, allowing the fabric 102 to be stored as a roll on the fabric barrel 134. The second longitudinal fabric end 122 is connected to the hem bar 164, allowing the hem bar 164 to exert a uniform force along the width of the bottom of the fabric 102.

[0043] The fabric 102 also has a first lateral side 126 and a second lateral side 128. The first lateral side 126 and the second lateral side 128 refer to the sides of the fabric 102. The fabric 102 is moveable between a first fabric retracted position 130 and a plurality of different second fabric extended positions 132. The first fabric retracted position 130 can be a retracted position, an intermediate position, or an extended position of the fabric 102. The second fabric extended position 132 can be fully extended or partially extended from the first fabric retracted position 130. The fabric 102 is moveable to a plurality of different second fabric extended positions 132. The second fabric extended position 132 is a subsequent position of the fabric 102 after the fabric 102 has been moved by the fabric barrel drive system 106 from the first fabric retracted position 130. The second fabric extended position 132 is remote from the first fabric retracted position 130. The fabric longitudinal axis 142 is perpendicular to the rotational axis 136 and is parallel to the direction the fabric 102 moves when the fabric 102 moves between the first fabric retracted position 130 and the second fabric extended position 132.

[0044] The first fabric retracted position 130 refers to the initial position of the fabric 102 in the retractable blind system 100. In this position, the fabric 102 is typically rolled up on the fabric barrel 134, with the hem bar 164 positioned near the top of the window or door frame. However, in the context of the fabric 102 and the arrangement as shown in Figure 1 , the first fabric retracted position 130 can be a retracted position, an intermediate position, or an extended position of the fabric 102, depending on the specific configuration of the retractable blind system 100. The fabric 102 is moveable from the first fabric retracted position 130 to a plurality of different second fabric extended positions 132 by the fabric barrel drive system 106.

[0045] The second fabric extended position 132 refers to the subsequent position of the fabric 102 after the fabric 102 has been moved by the fabric barrel drive system 106 from the first fabric retracted position 130. The second fabric extended position 132 can be fully extended or partially extended from the first fabric retracted position 130, depending on the specific configuration of the retractable blind system 100 and the user's preferences. The fabric 102 is moveable to a plurality of different second fabric extended positions 132, allowing the user to precisely control the amount of light entering the room. The second fabric extended position 132 is remote from the first fabric retracted position 130, with the fabric 102 unrolled from the fabric barrel 134 and the hem bar 164 positioned at a lower point in the window or door frame. The second fabric extended positions 132 can be any distance from the first fabric retracted position 130. Furthermore, there can be any number of second fabric extended positions 132 between a fully retracted position and a fully deployed position. In some examples as described below, the plurality of second fabric extended positions 132 are a plurality of discrete, separate positions in which the hem bar 164 is fixed. In some other examples, as also described below, the plurality of second fabric extended positions 132 can be a continuous range of different second fabric extended positions 132.

[0046] The fabric longitudinal axis 142 is a line that runs parallel to the direction in which the fabric 102 moves when it is moved between the first fabric retracted position 130 and the second fabric extended position 132 as shown in Figure 1. The fabric longitudinal axis 142 is also perpendicular to the rotational axis 136 of the fabric barrel 134. When the tension in the fabric 102 is adjusted by the fabric barrel drive system 106, the variable aperture material uniformly stretches in the direction of the fabric longitudinal axis 142. This uniform stretching allows the variable aperture material to adjust the amount of light passing through the fabric 102 in dependence of the tension applied to the fabric 102 by the fabric barrel drive system 106.

[0047] The hem bar locking mechanism 110 is an integrated component of the retractable blind system 100. The hem bar locking mechanism 110 interacts directly with the hem bar 164 to selectively engage and lock the hem bar 164 in a plurality of different second fabric extended positions 132. This allows the user to precisely control the position of the fabric 102.

[0048] The hem bar locking mechanism 110 includes at least one locking assembly 172 that is moveable between a locked position and a released position. In the locked position, the at least one locking assembly 172 engages with the hem bar 164 to lock the hem bar 164 in one of the different second fabric extended positions 132. In the released position, the at least one locking assembly 172 is disengaged from the hem bar 164, allowing the fabric 102 to be moved between the first fabric retracted position 130 and the second fabric extended position 132.

[0049] The at least one locking assembly 172 in some examples can comprise one or more parts for catching, gripping or fixing the hem bar 164. In some examples, the at least one locking assembly 172 comprises a first locking assembly 172 and a second locking assembly 186 respectively on the first lateral side 126 and a second lateral side 128. However, in other less preferred examples, there may be one locking assembly 172 on only the first lateral side 126 or a second lateral side 128. In other examples, the locking assembly 172 can lock the hem bar 164 in a central position of the hem bar 164.

[0050] The different examples of the locking assembly 172 are shown and discussed below with respect to the arrangements as shown in Figures 5a, 5b, 6a, 6b.

[0051] The hem bar locking mechanism 110 also includes a locking actuator 112 that is operatively coupled to the at least one locking assembly 172. The locking actuator 112 is configured to move each of the first locking assembly 172 and the second locking assembly 186 between the locked position and the released position. The locking actuator 112 is connected to a control unit 104, which sends a control signal to the locking actuator 112 to move the first and second locking assembly 172, 186 between the locked position and the released position. This allows the user to easily and precisely control the position of the fabric 102. The locking actuator 112 will be described in more detail below. Whilst the examples discussed in reference to the Figures show the locking actuator 112, in some examples the locking actuator 112 is optional and not needed. Indeed, the hem bar locking mechanism 110 can be manually actuated with a tool or e.g. a hand crank. This can be alternative or in addition to the locking actuator 112. For example, the hem bar locking mechanism 110 can be manually operated if the locking actuator 112 fails.

[0052] In the arrangement as shown in Figure 1 , the first locking assembly 172 comprises the first moveable locking gate 158 and is positioned on the first lateral side 126 of the fabric 102. The first moveable locking gate 158 is designed to engage with the first engagement element 166 of the hem bar 164 when the first locking assembly 172 is in the locked position. This engagement locks the hem bar 164 in one of the different second fabric extended positions 132.

[0053] The first moveable locking gate 158 includes a plurality of first locking recesses 162. Each of these first locking recesses 162 is designed to retain the first engagement element 166 of the hem bar 164 in a predetermined second fabric extended position 132. This allows the user to precisely control the position of the fabric 102 in a plurality of discrete second fabric extended positions 132. The first moveable locking gate 158 is pivotally mounted on a first locking assembly pivot axis 160. This allows the first moveable locking gate 158 to pivot between the locked position and the released position. The first locking assembly pivot axis 160 is designed to be robust and durable to withstand the forces applied by the locking actuator 112 and the engagement and disengagement of the first moveable locking gate 158 with the first engagement element 166 of the hem bar 164.

[0054] Whilst the first moveable locking gate 158 is described as pivoting between the locked and the release positions, in other examples, the first locking assembly 172 is configured to slide between the locked and the release positions. For example, the first and second hem bar gripping plate slide between the locked and release positions as described in more detail below.

[0055] The second moveable locking gate 174 is positioned on the second lateral side 128 of the fabric 102. The second moveable locking gate 174 is designed to engage with the second engagement element 176 of the hem bar 164 when the second locking assembly 186 is in the locked position. This engagement locks the hem bar 164 in one of the plurality of different second fabric extended positions 132.

[0056] Similar to the first moveable locking gate 158, the second moveable locking gate 174 also includes a plurality of second locking recesses 180. Likewise, each of these second locking recesses 180 is designed to retain the second engagement element 176 of the hem bar 164 in a predetermined second fabric extended position 132. This allows the user to precisely control the position of the fabric 102.

[0057] The second moveable locking gate 174 is also pivotally mounted on a second locking assembly pivot axis 178. This allows the second moveable locking gate 174 to pivot between the locked position and the released position.

[0058] In some examples, the second locking recesses 180 and the first locking recesses 162 are arranged in pairs of a first locking recess 162 and a second locking recess 180 which are arranged at the same distance from the fabric barrel 134. This means that the first locking recess 162 and a second locking recess 180 define a second fabric extended position 132 which is horizontal. The actuation of the hem bar locking mechanism 110 is discussed in more detail with respect to Figures 5a, 5b, 5c and 5d below.

[0059] In an alternative example, instead of a first and second moveable locking gate 158, 174, the hem bar locking mechanism 110 comprises different mechanisms for fixing the hem bar 164. In some configurations, the hem bar locking mechanism 110 includes a first hem bar gripping plate (not shown) positioned on the first lateral side 126 of the fabric 102. The first hem bar gripping plate is part of a friction grip assembly that is designed to engage with the hem bar 164 when the friction grip assembly is in the locked position. The friction grip assembly exerts a frictional force between the first hem bar gripping plate and the hem bar 164, locking the hem bar 164 in place with the fabric 102 in a plurality of different second fabric extended positions 132. The first hem bar gripping plate may squeeze the hem bar 164 against a reciprocal first hem bar gripping plate or against a surface e.g. a wall or window frame.

[0060] Similarly, the hem bar locking mechanism 110 includes a second hem bar gripping plate (not shown) positioned on the second lateral side 128 of the fabric 102. The second hem bar gripping plate is part of a friction grip assembly that is designed to engage with the hem bar 164 when the friction grip assembly is in the locked position, similar to the first hem bar gripping plate.

[0061] In some alternative examples, the hem bar locking mechanism 110 includes a first hem bar locking bolt (not shown). The first hem bar locking bolt is positioned on the first lateral side 126 of the hem bar 164. The first hem bar locking bolt is part of a hem bar locking bolt assembly that is designed to engage with the hem bar 164 when the hem bar locking bolt assembly is in the locked position. The hem bar locking bolt assembly locks the hem bar 164 in place with the fabric 102 in a plurality of different second fabric extended positions 132 by engaging reciprocal recesses in a frame of the retractable blind system 100.

[0062] Similarly, the hem bar locking mechanism 110 includes a second hem bar locking bolt (not shown) positioned on the second lateral side 128 of the hem bar 164. The second hem bar locking bolt is the same as the first hem bar locking bolt. The headbox 144 as shown in Figure 1 houses several other components of the retractable blind system 100, including the fabric barrel 134 and the fabric barrel drive system 106. The headbox 144 is typically mounted at the top of the window or door frame, or any other suitable location.

[0063] The headbox 144 is designed to be robust and durable to protect the components housed within it from damage. The headbox 144 also provides a neat and tidy appearance for the retractable blind system 100, concealing the fabric barrel 134 and the fabric barrel drive system 106 when the fabric 102 is in the first fabric retracted position 130. The headbox 144 may also include features to facilitate the installation and maintenance of the retractable blind system 100, such as access panels or removable covers.

[0064] The fabric barrel 134 is housed within the headbox 144. The fabric barrel 134 is designed to store the fabric 102 as a roll, allowing the fabric 102 to be easily extended and retracted. The fabric barrel 134 is connected to the first longitudinal fabric end 124 of the fabric 102 and is configured to rotate about the rotational axis 136, allowing the fabric 102 to be moved between the first fabric retracted position 130 and the second fabric extended position 132.

[0065] The fabric barrel 134 comprises a barrel shaft 138 and rotates about the rotational axis 136 and allows the fabric 102 to be rolled and unrolled on the fabric barrel 134. The barrel shaft 138 is mounted in bearing 140 within the headbox 144.

[0066] In some examples, the fabric barrel 134 includes a return spring mounted within the fabric 102. The return spring provides a restoring force to the fabric barrel 134, helping to maintain the tension in the fabric 102 and ensuring that the fabric 102 is smoothly and evenly rolled and unrolled on the fabric barrel 134.

[0067] The hem bar 164 is connected to the second longitudinal fabric end 122 of the fabric 102. The hem bar 164 provides a means to exert uniform force along the width of the bottom of the fabric 102, keeping the bottom edge of the fabric flat. As mentioned above, the hem bar 164 is selectively engaged and locked in a plurality of different second fabric extended positions 132 by the hem bar locking mechanism 110. This allows the user to precisely control the position of the fabric 102.

[0068] The hem bar 164 includes a first engagement element 166 and a second engagement element 176. These engagement elements are designed to engage with the first locking recess 162 and the second locking recess 180 of the first moveable locking gate 158 and the second moveable locking gate 174, respectively, when the first and second locking assemblies 172, 186 are in the locked position. This engagement locks the hem bar 164 in one of the plurality of different second fabric extended positions 132. In some examples, as shown in Figures 2 and 3, the first engagement element 166 and the second engagement element 176 are a laterally projecting peg. The laterally projecting pegs are rounded to aid engagement with the first locking recesses 162 and the second locking recesses 180. However, in other examples, the first engagement element 166 and the second engagement element 176 can be any other suitable features such as a hook, eyelet, pin, etc.

[0069] The hem bar 164 is made from a rigid material, such as steel, aluminium, plastic, wood, or a composite material. This ensures that the hem bar 164 maintains its shape and function under various tensions. The hem bar 164 is also designed to be robust and durable to withstand the forces applied by the fabric barrel drive system 106 and the engagement and disengagement with the hem bar locking mechanism 110.

[0070] Turning to Figure 2 and Figure 3, the hem bar locking mechanism 110 will be discussed in more detail. Figure 2 shows a close-up front view of the retractable blind system 100 on the first lateral side 126. Figure 3 presents a close-up perspective view of the retractable blind system 100 on the second lateral side 128 of the retractable blind system 100.

[0071] Figure 2 shows a detailed view of the chamfered edge 184 of the first locking recess 162 and the second locking recess 180. The chamfered edge 184 is a feature of the first locking recess 162 and the second locking recess 180 that facilitates smooth engagement and disengagement of the first locking recess 162 and the second locking recess 180 with the first engagement element 166 and the second engagement element 176 of the hem bar 164, respectively. Figure 4 is a schematic view of the retractable blind system 100 having a control unit 104. The control unit 104 is a component of the retractable blind system 100 that is responsible for controlling the operation of the retractable blind system 100. Whilst the control unit 104 is part of the retractable blind system 100, in some examples the control unit 104 is not part of the retractable blind system 100. In this case, the retractable blind system 100 receives control instructions from an external control unit.

[0072] The control unit 104 is a component of the retractable blind system 100 that is responsible for controlling the operation of the retractable blind system 100. The control unit 104 is connected to the locking actuator 112 and the fabric barrel drive system 106 and is configured to send control signals to these components to control the movement of the fabric 102 and the operation of the hem bar locking mechanism 110.

[0073] The control unit 104 includes a processor 114 and a memory 116. The processor 114 is responsible for executing instructions stored in the memory 116 to control the operation of the retractable blind system 100. The memory 116 is responsible for storing instructions and data used by the processor 114.

[0074] The control unit 104 also includes a hem bar locking sensor 118. The hem bar locking sensor 118 is connected to the control unit 104 and is configured to detect the position of the hem bar locking mechanism 110 within the retractable blind system 100. This allows the control unit 104 to determine whether the hem bar 164 is locked in one of the second fabric extended positions 132.

[0075] The control unit 104 further includes a communication module 120. The communication module 120 is configured to facilitate communication between the control unit 104 and remote devices. This allows the user to control the operation of the retractable blind system 100 remotely, for example, using a smartphone app or a remote control. The processor 114 is a component of the control unit 104. The processor 114 is responsible for executing instructions stored in the memory 116 to control the operation of the retractable blind system 100. The processor 114 is designed to be robust and reliable, capable of executing instructions quickly and accurately to ensure smooth and precise operation of the retractable blind system 100.

[0076] The memory 116 is a component of the control unit 104. The memory 116 is responsible for storing instructions and data used by the processor 114. The memory 116 can store a variety of data, including instructions for controlling the operation of the retractable blind system 100, data representing the current state of the retractable blind system 100, and data representing user preferences for the operation of the retractable blind system 100.

[0077] The memory 116 is designed to be robust and reliable, capable of storing and retrieving data quickly and accurately. The memory 116 is also designed to retain data even when the power to the control unit 104 is turned off, ensuring that the state of the retractable blind system 100 and user preferences are preserved between uses of the retractable blind system 100.

[0078] The communication module 120 is optionally a component of the control unit 104. The communication module 120 is configured to facilitate communication between the control unit 104 and remote devices. This allows the user to control the operation of the retractable blind system 100 remotely, for example, using a smartphone app or a remote control.

[0079] The communication module 120 can support a variety of communication protocols, including Wi-Fi, Bluetooth, RFID, and Zigbee. This allows the communication module 120 to communicate with a wide range of remote devices, providing the user with flexibility in controlling the operation of the retractable blind system 100.

[0080] The fabric barrel drive system 106 is a component of the retractable blind system 100 that is responsible for moving the fabric 102 between the first fabric retracted position 130 and the second fabric extended position 132. The fabric barrel drive system 106 is operatively connected to the fabric barrel 134 and is configured to rotate the fabric barrel 134 to move the fabric 102.

[0081] The fabric barrel drive system 106 includes a motor 108. The motor 108 is responsible for providing the mechanical power to rotate the fabric barrel 134. The motor 108 is designed to be robust and reliable, capable of providing a consistent and smooth rotation of the fabric barrel 134 to ensure smooth and precise movement of the fabric 102.

[0082] The locking actuator 112 is a component of the hem bar locking mechanism 110. The locking actuator 112 is operatively coupled to the at least one locking assembly 172 and is configured to move the at least one locking assembly 172 between the locked position and the released position. The locking actuator 112 is connected to the control unit 104, which sends a control signal to the locking actuator 112 to move the locking assembly 172 between the locked position and the released position. In some examples, there is a single locking actuator 112 arranged to actuate the first locking assembly 172 e.g. the first moveable locking gate 158 and the second locking assembly 186 e.g. the second moveable locking gate 174. In this way, the locking actuator 112 is arranged to move both the first moveable locking gate 158 and the second moveable locking gate 174 at the same time. In some other examples, there are a plurality of locking actuators 112. For example, as shown in Figure 1 there is a first locking actuator 112 operatively coupled to the first locking assembly 172 and the first moveable locking gate 158 and a second locking actuator 112 operatively coupled to the second locking assembly 186 and the second moveable locking gate 174. In other examples, each locking assembly 172, 186 may be operatively coupled with a plurality of locking actuators 112.

[0083] In some implementations as shown in Figures 6a and 6b, the locking actuator 112 includes a locking motor 148. The locking motor 148 is responsible for providing the mechanical power to move the first and second locking assembly 172, 186 between the locked position and the released position. The locking motor 148 is designed to be robust and reliable, capable of providing a consistent and smooth movement of the first and second locking assembly 172, 186 to ensure smooth and precise operation of the hem bar locking mechanism 110. The locking motor 148 is also designed to work in conjunction with the control unit 104. The control unit 104 sends control signals to the locking motor 148 to control the movement of the at least one locking assembly 172. This allows the user to precisely control the position of the hem bar 164.

[0084] In some implementations, the at least one locking actuator 112 alternatively includes a locking linear actuator 170. The locking linear actuator 170 is responsible for providing the mechanical power to move the at least one locking assembly 172 between the locked position and the released position. The locking linear actuator 170 is designed to be robust and reliable, capable of providing a consistent and smooth movement of the at least one locking assembly 172 to ensure smooth and precise operation of the hem bar locking mechanism 110.

[0085] The locking linear actuator 170 is also designed to work in conjunction with the control unit 104. The control unit 104 sends control signals to the locking linear actuator 170 to control the movement of the at least one locking assembly 172. This allows the user to precisely control the position of the hem bar 164.

[0086] The hem bar locking mechanism 110 will now be described in more detail with respect to Figures 5a, 5b, 6a and 6b. Figure 5a shows a schematic plan close-up view of the hem bar locking mechanism 110 using a locking linear actuator 170 in a locked position. Figure 5b shows a schematic plan close-up view of the hem bar locking mechanism 110 using a locking linear actuator 170 in a released position.

[0087] Figure 6a shows a schematic plan close-up view of the hem bar locking mechanism 110 using a locking motor 148 in a locked position. Figure 6b shows a schematic plan close-up view of the hem bar locking mechanism 110 using a locking motor 148 in a released position.

[0088] Figures 5a and 5b provide a detailed view of the linear actuator assembly 184. The linear actuator assembly 184 is configured to move the at least one locking assembly 172 between the locked position and the released position. The linear actuator assembly 184 includes a locking linkage 168 that is coupled between the linear actuator assembly 184 and the first moveable locking gate 158 and the second moveable locking gate 174. In some examples, the locking linear actuator 170 is a solenoid, a pneumatic piston, a hydraulic piston or any other suitable mechanism for generating linear motion.

[0089] Figure 5a provides a detailed view of the at least one locking assembly 172 in the locked position. In the locked position, the first moveable locking gate 158 and the second moveable locking gate 174 are engaged with the first engagement element 166 and the second engagement element 176 of the hem bar 164, respectively. This prevents the fabric 102 from being moved and keeps the fabric 102 in the second fabric extended position 132.

[0090] Figure 5b provides a detailed view of the at least one locking assembly 172 in the released position. In the released position, the first moveable locking gate 158 and the second moveable locking gate 174 are disengaged from the first engagement element 166 and the second engagement element 176 of the hem bar 164, respectively. This allows the fabric 102 to be moved between the first fabric retracted position 130 and the second fabric extended position 132. The locking assembly 172 is moved between the locked position and the released position by the locking actuator 112, which is operatively coupled to the locking assembly 172 and is controlled by the control unit 104.

[0091] Figure 6a provides a detailed view of the locking motor assembly 146. The locking motor assembly 146 provides the same functionality as the linear actuator assembly 184 as shown in Figures 5a and 5b. The locking motor assembly 146 is a component of the locking actuator 112 and is configured to move the locking assembly 172 between the locked position and the released position. The locking motor assembly 146 includes a locking motor 148, a drive shaft 152, and a gearbox 150.

[0092] The locking motor 148 is arranged to provide the mechanical power to move the locking assembly 172 between the locked position and the released position. The drive shaft 152 is connected to the locking motor 148 and is designed to transmit the mechanical power from the locking motor 148 to the gearbox 150. The gearbox 150 is coupled between the drive shaft 152 and the first moveable locking gate 158 and the second moveable locking gate 174 and is designed to convert the rotational motion of the drive shaft 152 into the linear motion required to move the locking assembly 172. The gearbox 150 is coupled between the drive shaft 152 and the first moveable locking gate 158 and the second moveable locking gate 174. The gearbox 150 is designed to convert the rotational motion of the drive shaft 152 into the linear motion required to move the locking assembly 172.

[0093] The gearbox 150 includes a worm gear 154 mounted on the drive shaft 152 and a locking gear 156 mounted on the locking assembly 172. The worm gear 154 and the locking gear 156 are designed to engage with each other to convert the rotational motion of the drive shaft 152 into the linear motion of the locking assembly 172.

[0094] Figure 6b provides a detailed view of the locking assembly 172 in the released position. The locking motor assembly 146 provides the same functionality as the linear actuator assembly 184 as shown in Figures 5a and 5b. In the released position, the first moveable locking gate 158 and the second moveable locking gate 174 are disengaged from the first engagement element 166.

[0095] Operation of the retractable blind system 100 will now be discussed. The fabric 102 is moved from the first fabric retracted position 130 to one of a plurality of different second fabric extended positions 132 by the fabric barrel drive system 106. The fabric barrel drive system 106 rotates the fabric barrel 134 to unroll the fabric 102 and move it to the desired second fabric extended position 132.

[0096] The transition from the first fabric retracted position 130 to the second fabric extended position 132 is controlled by the control unit 104. The control unit 104 sends control signals to the fabric barrel drive system 106 to control the rotation of the fabric barrel 134 and the movement of the fabric 102. This allows the user to precisely control the position of the fabric 102.

[0097] The hem bar locking mechanism 110 is engaged to lock the hem bar 164 in one of the second fabric extended positions 132. The hem bar locking mechanism 110 includes a locking assembly 172 that is moved between the locked position and the released position by the locking actuator 112. In the locked position, the locking assembly 172 engages with the hem bar 164 to lock the hem bar 164 in the desired second fabric extended position 132.

[0098] The engagement of the hem bar locking mechanism 110 is controlled by the control unit 104. The control unit 104 sends a control signal to the locking actuator 112 to move the locking assembly 172 to the locked position. This allows the user to precisely control the position of the hem bar 164.

[0099] The tension of the fabric 102 is adjusted by rotating the fabric barrel 134. The fabric barrel 134 is rotated by the fabric barrel drive system 106, which is operatively connected to the fabric barrel 134. The fabric barrel drive system 106 is controlled by the control unit 104, which sends control signals to the fabric barrel drive system 106 to control the rotation of the fabric barrel 134 and the tension of the fabric 102.

[0100] The adjustment of the tension of the fabric 102 is performed while the hem bar 164 is locked in the second fabric extended position 132. This allows the user to adjust the tension of the fabric 102 without affecting the position of the hem bar 164. The adjustment of the tension of the fabric 102 can be used to control the amount of light passing through the fabric 102, as the fabric 102 is made from a variable aperture material that adjusts the amount of light passing through the fabric 102 in dependence of the tension applied to the fabric 102 by the fabric barrel drive system 106.

[0101] The modification of the opacity of the fabric 102 is controlled by the control unit 104. The control unit 104 sends control signals to the fabric barrel drive system 106 to control the rotation of the fabric barrel 134 and the tension of the fabric 102. This allows the user to precisely control the opacity of the fabric 102.

[0102] Another example of the retractable blind system 100 will now be discussed in reference to figures 7a, 7b, 8a, 8b, 9a and 9b. Figures 7a and 7b show a cross-sectional side view of a hem bar locking mechanism 110 respectively in an unlocked position and a locked position. Figures 8a and 8b show another cross-sectional side view of a hem bar locking mechanism 110 having a locking assembly 172. The locking assembly 172 comprises a plurality of locking gates 200 according to some examples. Figures 9a and 9b show a cut away perspective view of a hem bar locking mechanism 110 as shown in Figures 7a and 7b respectively.

[0103] The functionality of the locking mechanism 110 as shown in Figures 7a, 7b, 8a, 8b, 9a, and 9b is generally the same in principle as previously discussed in reference to the previous Figures. That is the locking mechanism 110 is moveable between a locked position and a released position such that the hem bar 164 can be selectively engaged and locked in the plurality of different second fabric extended positions 132.

[0104] The arrangement as shown in Figures 7a, 7b, 8a, 8b, 9a and 9b shows a first lateral side 126 for the purposes of clarity. The locking mechanism 110 is mounted on the first lateral side 126 and the second lateral side 128, similar to that previously discussed. The first lateral side 126 comprises a lateral housing 216 in which the first locking assembly 172 is mounted and the hem bar 164 is arranged to move in. The lateral housing 216 may be recessed into a wall of the building in order to hide the edge of the retractable blind system 100. The second lateral side 128 comprises a similar lateral housing 216, although not shown in the figures.

[0105] The hem bar 164 is engaged and locked by the locking mechanism 110 with a set 200 of first moveable locking gates 158 on the first lateral side 126 and a set 200 of second moveable locking gates 174 on the second lateral side 128. The set 200 of the first moveable locking gates 158 are pivotable about a pivot 204 aligned along a pivot axis 202. The pivot axis 202 is fixed with respect to the lateral housing 216. The pivot axis 202 is perpendicular to the fabric longitudinal axis 142 and the rotational axis 136 of the fabric barrel 134. This is in contrast to the arrangement as shown in e.g. Figures 2 and 3 wherein the first moveable locking gate 158 and the second moveable locking gate 174 are rotatable about an axis which is parallel to the fabric longitudinal axis 142. The set 200 of the second moveable locking gates 174 are the same as the set 200 of the first moveable locking gates 158 and will not be discussed in detail for the purpose of brevity. The first moveable locking gate 158 comprises a “U” cross-sectional shape with a first gate arm 222 and a second gate arm (not shown). The first gate arm 222 and the second gate arm are pivotally mounted to the walls of the lateral housing 216. A barrier plate 224 extends between the first gate arm 222 and the second gate arm. The barrier plate 224 is configured to intersect the path of the hem bar 164 when in the locked position and prevent movement of the hem bar 164 in a direction towards the fabric barrel 134.

[0106] Each first moveable locking gate 158 comprises a locking carriage 206 and connected thereto via a locking spring 208. The locking carriage 206 is slidable in a direction parallel with the fabric longitudinal axis 142. The locking carriage 206 is operatively coupled to an actuator plate 210. The locking carriage 206 is fixed with respect to the actuator plate 210 such that the locking carriage 206 moves when the actuator plate 210 moves. The actuator plate 210 is riveted to the locking carriage 206, but any suitable fastening can be used to fix the actuator plate 210 to the locking carriage 206 e.g. welding, adhesive or screw fastenings etc. The actuator plate 210 is coupled to an actuator e.g. a locking linear actuator 170 or a locking motor 148 as discussed previously. The actuator plate 210 is slidable with respect to the lateral housing 216 within a housing slot 226. The housing slot 226 constrains the movement of the actuator plate 210 with respect to the lateral housing 216 such that the actuator plate 210 moves in a direction parallel with the longitudinal axis of the lateral housing 216. Since the first moveable locking gate 158 is connected to the locking carriage 206 and a locking spring 208, this means that if one of the first moveable locking gates 158 is jammed, it will not prevent the actuator plate 210 from moving and still allow other first moveable locking gates 158 actuating.

[0107] The locking carriage 206 and the first moveable locking gate 158 is in a released position as shown in Figure 7a, 8a, and 9a. When the locking carriage 206 moves in a direction as shown in Figure 7a, the locking carriage 206 engages a cam surface 212. The locking carriage 206 is moveable by a distance 214 as shown in Figure 7a. This causes the first moveable locking gate 158 to pivot and move into the locking position as shown in Figure 7b. When the first moveable locking gate 158 is in the locked position, the hem bar 164 is prevented from being retracted towards the fabric barrel 134. Similarly the first moveable locking gate 158 is shown in the released position in Figures 8a and 9a. The first moveable locking gate 158 is also shown in the locked position in Figures 8b and 9b.

[0108] When the locking carriage 206 moves in a direction opposite to that shown in Figure 7a, the locking carriage 206 causes the first moveable locking gate 158 to snap back to the released position as shown in Figure 7a. The locking carriage 206 is connected to the first moveable locking gate 158 via a locking spring 208 between a first pin 218 fixed to the locking carriage 206 and a second pin 220 fixed to the first moveable locking gate 158. This means that movement of the locking carriage 206 causes the first moveable locking gate 158 to move.

[0109] Whilst Figures 7a and 7b show a single first moveable locking gate 158, the locking mechanism 110 comprises a plurality of locking assemblies 172 e.g. a set 200 of first moveable locking gates 158 as shown in Figures 8a and 8b. The first moveable locking gates 158 as shown in Figure 8a and 8b are each coupled to the actuator plate 210. The set 200 of the first moveable locking gates 158 are operatively coupled to the actuator plate 206 in a similar way as described in reference to Figures 7a and 7b. Accordingly, when the actuator plate 210 moves in a direction parallel with the fabric longitudinal axis 142, the actuator plate 210 causes each of the first moveable locking gate 158 in the locking mechanism 110 to move between the locked and released position. This means that the actuator plate 210 can simultaneously actuate all the first moveable locking gates 158 at the same time. The same functionality is applicable to the set 200 of second moveable locking gates 174.

[0110] The actuator plate 210 is planar and allows a compact arrangement without projecting into the path of the hem bar 164. The actuator plate 210 can be any suitable rigid element to transmit movement from the actuator 170 to the locking carriage 206 e.g. a rod etc.

[0111] The set 200 of the first moveable locking gates 158 prevent movement of the hem bar 164 in a direction towards the fabric barrel 134. Each first moveable locking gate 158 defines a different second fabric extended position 132. This means that the set 200 of the first moveable locking gates 158 selectively engage and lock the hem bar 164 in the plurality of different second fabric extended positions 132. In some examples, the first moveable locking gates 158 do not prevent movement of the hem bar 164 in a direction away from the fabric barrel 134. In this case, the hem bar 164 engages the cam surface 212 of the first moveable locking gate 158 as the hem bar 164 extends in a direction away from the fabric barrel 164 along the fabric longitudinal axis 142. When the hem bar 164 engages barrier plate 224 when moving in a direction away from fabric barrel 134, the cam surface 212 pushes against the locking carriage 206. This causes the locking carriage 206 to move and causes the first moveable locking gate 158 from the locked position into the release position. The first moveable locking gate 158 can then move out of the path of the hem bar 164. The movement of the cam surface 212 against the locking carriage 206 causes the actuator plate 210 to move and the locking mechanism 110 moves into the released position. This means that the hem bar 164 can be extended away from the fabric barrel 134 along the fabric longitudinal axis 142 even if the first moveable locking gate 158 is in the locked position. Accordingly, the fabric 102 can be extended to another second fabric extended position 132 even when the locking mechanism 110 is in the locked position.

[0112] The terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises," "comprising," "includes," and / or "including" when used herein specify the presence of stated features, integers, actions, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, actions, steps, operations, elements, components, and / or groups thereof.

[0113] It will be understood that, although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0114] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe a relationship of one element to another element as illustrated in the Figures. It will be understood that these terms and those discussed above are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

[0115] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealised or overly formal sense unless expressly so defined herein.

[0116] It is to be understood that the present disclosure is not limited to the aspects described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the present disclosure and appended claims. In the drawings and specification, there have been disclosed aspects for purposes of illustration only and not for purposes of limitation, the scope of the disclosure being set forth in the following claims.

Claims

1. Claims1 . A retractable blind system (100) comprising: a fabric (102) having a first longitudinal fabric end (124) and a second longitudinal fabric end (122); a fabric barrel (134) connected to the first longitudinal fabric end (124) and configured to store the fabric (102) as a roll; a hem bar (164) connected to the second longitudinal fabric end (122); a fabric barrel drive system (106) configured to move the fabric (102) between a first fabric retracted position (130) and a plurality of different second fabric extended positions (132); and a hem bar locking mechanism (110) configured to selectively engage and lock the hem bar (164) in the plurality of different second fabric extended positions (132).

2. The retractable blind system (100) according to claim 1 , wherein the hem bar locking mechanism (110) comprises at least one locking assembly (172, 186) moveable between a locked position and a released position.

3. The retractable blind system (100) according to claim 2, wherein the at least one locking assembly (172) is a first locking assembly (172) which comprises a first moveable locking gate (158) positioned on a first lateral side (126) of the fabric (102) and second locking assembly (186) which comprises a second moveable locking gate (174) positioned on a second lateral side (128) of the fabric (102).

4. The retractable blind system (100) according to claim 3, wherein the first moveable locking gate (158) comprises a plurality of first locking recesses (162) and the second moveable locking gate (174) comprises a plurality of second locking recesses (180).

5. The retractable blind system (100) according to claim 4, wherein the hem bar (164) comprises a first engagement element (166) configured to engage with the first locking recess (162) when the at least one locking assembly (172) is in the locked position, and a second engagement element (176) configured to engage with the second locking recess (180) when the at least one locking assembly (172) is in the locked position.

6. The retractable blind system (100) according to any of claims 4 or 5 wherein each of the first locking recess (162) and the second locking recess (180) comprises a chamfered edge (184).

7. The retractable blind system (100) according to any one of claims 2 to 5, further comprising a locking actuator (112) operatively coupled to the at least one locking assembly (172) and configured to move the at least one locking assembly (172) between the locked position and the released position.

8. The retractable blind system (100) according to claim 7, further comprising a control unit (104) connected to the locking actuator (112) and configured to send a control signal to the locking actuator (112) to move the at least one locking assembly (172) between the locked position and the released position.

9. The retractable blind system (100) according to claim 8, wherein the control unit (104) is further configured to issue a control signal to the fabric barrel drive system (106) to change the tension in the fabric (102) when the hem bar locking mechanism (110) is in the locked position.

10. The retractable blind system (100) according to any one of claims 8 to 9, further comprising a communication module (120) configured to facilitate communication between the control unit (104) and remote devices.

11. The retractable blind system (100) according to claim 10, wherein the communication module (120) is selected from the group consisting of a WiFi module, a Bluetooth module, an RFID module, and a Zigbee module.

12. The retractable blind system (100) according to any one of the preceding claims, wherein the fabric (102) comprises a variable aperture material configured to adjust the amount of light passing through the fabric (102) in dependence of the tension applied to the fabric (102) by the fabric barrel drive system (106).

13. The retractable blind system (100) according to any one of the preceding claims, wherein the fabric barrel drive system (106) comprises a motor (108) configured torotate the fabric barrel (134) to move the fabric (102) between the first fabric retracted position (130) and the plurality of different second fabric extended positions (132).

14. The retractable blind system (100) according to any of claims 3 to 13 wherein the first locking assembly (172) comprises a plurality of first moveable locking gates (158) positioned on a first lateral side (126) of the fabric (102) and second locking assembly (186) which comprises a plurality of second moveable locking gates (174) positioned on a second lateral side (128) of the fabric (102).

15. The retractable blind system (100) according to claim 14 wherein the plurality of first moveable locking gates and the plurality of second moveable locking gates (174) are each operatively connected to an actuator plate (210).

16. The retractable blind system (100) according to claims 14 or 15 wherein the plurality of first moveable locking gates (158) and the plurality of second moveable locking gates (174) are pivotable between the locked position and the released position wherein the pivot axes (202) of the plurality of first moveable locking gates (154) and the plurality of second moveable locking gates (174) is perpendicular to a fabric longitudinal axis (142) and a rotational axis (136) of the fabric barrel (134).

17. The retractable blind system (100) according any preceding claim wherein the hem bar (164) is arranged to engage and move the at least one locking assembly (172, 186) from the locked position to the released position when the hem bar (164) moves in a direction away from the first fabric retracted position (130).

18. A method of locking a hem bar (164) in a retractable blind system (100) according to any one of claims 1 to 17, the method comprising: moving the fabric (102) mounted on a fabric barrel (134) from a first fabric retracted position (130) to a plurality of different second fabric extended positions (132); and engaging the hem bar locking mechanism (110) to lock the hem bar (164) in the plurality of different second fabric extended positions (132).

19. The method according to claim 18 wherein the method comprises:adjusting a tension of the fabric (102) by rotating the fabric barrel (134) whilst the hem bar (164) is locked in the second fabric extended position (132); and modifying the opacity of the fabric (102) in dependence of adjusting the tension of the fabric (102) whilst the hem bar (164) is locked in the second fabric extended position (132).

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