Curtain with spring wire turn brake

Abstract

This document describes a braking assembly for use in curtains including spring-balanced blackout blinds, such as spring-balanced motorized blinds. The braking assembly includes a wire braking spring forming multiple coils. These coils terminate in a foot assembly having feet and support portions. When a force (e.g., spring tension or spring release) is applied to the feet, the support portions support the feet. Because the feet are supported at each of their ends, the support portions significantly reduce the risk of the feet bending. Where the likelihood of foot bending is low, the braking spring can use a smaller wire diameter, which generates less resistance when the braking spring rotates in an actuated state. In the case of battery-powered blackout blinds, less resistance saves battery life.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 067,210, filed on August 18, 2020, the entire disclosure of which is incorporated herein by reference. Background Technology

[0003] Curtains can be installed in front of one or more windows, for example, to block sunlight from entering a space and / or provide privacy. Curtains can include, for example, roller blinds, Roman blinds, Venetian blinds, or valances. Roller blinds typically consist of flexible blackout fabric wound around a long, thin roller tube. Such roller blinds may include a weighted lower rod located at the lower end of the blackout fabric. The lower rod allows the blackout fabric to hang in front of one or more windows on which the roller blind is mounted. Typical curtains can be installed on a structure around the window, such as a window frame. Such curtains may include brackets located at opposite ends. The brackets can be configured to operably support the roller tube, allowing the flexible material to be raised and lowered. For example, the brackets can be configured to support the respective ends of the roller tube. The brackets can be attached to a structure, such as a wall, ceiling, window frame, or other structure. Summary of the Invention

[0004] This document describes a braking assembly for curtains employing an electric roller system. The electric roller system may include a roller for winding (and unwinding) a flexible member, such as blackout fabric. A housing may be disposed within the roller and hold a motor, logic controls for the motor, a drive shaft, and a braking assembly, the drive shaft for rotating a disc connected to the roller via a disc shaft. The motor may use AC or DC power. Power may be supplied by wires or a battery. The braking assembly includes: a spindle; an input member coupled to the drive shaft and rotatable about the spindle; an output member coupled to the disc shaft and rotatable about the spindle; and a braking spring disposed on the spindle. The braking spring described herein includes: a plurality of coils; a tang extending from the plurality of coils; and a support portion extending from the tang, wherein the braking assembly prevents the flexible member from unwinding when the motor is not actuated.

[0005] Another braking component for an electric hose reel system includes: a spindle; and a braking spring disposed on the spindle, the braking spring including a plurality of coils, a shank extending from the plurality of coils and a support portion extending from the shank, wherein in a first rotational position, a force is applied to the shank, thereby driving the spring back so that the plurality of coils are tightened on the spindle and preventing rotation between the plurality of coils and the spindle.

[0006] A braking spring for an electric hose reel system comprises a plurality of coils, each coil having a foot assembly at any end. Each foot assembly includes a radially extending foot and a support portion extending from the foot. The foot receives several forces acting on it to affect the tension of the plurality of coils. For example, a first force (e.g., a locking force) may act on the foot. For example, a second force (e.g., a driving force) may act on the foot. The foot is supported at two points by the stress generated by these forces applied to it. Attached Figure Description

[0007] Figure 1A This is a perspective view of an electric curtain system.

[0008] Figure 1B This is a perspective view of an exemplary motor drive assembly for an electric hose reel system, with a portion of the housing removed.

[0009] Figure 1C It is used for Figure 1B A perspective view of an exemplary brake spring of the drive component.

[0010] Figure 2 This is a perspective view of an exemplary brake spring disclosed herein.

[0011] Figure 3 This is a perspective view of the braking assembly used in the electric hose reel system disclosed in this article.

[0012] Figure 4 yes Figure 3 Exploded perspective view of the braking components.

[0013] Figure 5 This is a side elevation view of the braking assembly in its first rotating state as disclosed in this article.

[0014] Figure 6 It was cut through line 6-6. Figure 5 A cross-sectional view of the braking assembly.

[0015] Figure 7 This is a side elevation view of the braking assembly in its second rotational state as disclosed in this article.

[0016] Figure 8 It was cut through line 8-8. Figure 7 A cross-sectional view of the braking assembly.

[0017] Figures 9A to 9B This is a perspective view of an exemplary brake spring disclosed herein.

[0018] Figure 9C This is a plan view of an exemplary brake spring disclosed herein. Detailed Implementation

[0019] Motorized blinds (such as motorized roller systems or blackout blinds) may include a roller and a flexible member or material, such as window blackout fabric, attached to the roller. Driving the roller allows it to receive or release the flexible material in a wound manner. Motorized blinds may also include a drive assembly that can drive the roller (e.g., rotate the roller to cause the flexible material to wind onto and unwind from the roller).

[0020] As the flexible member is wound onto the roller, the material of the flexible member can form multiple layers (or "wounds"). A portion of the flexible member may be wound onto the roller, and another portion of the flexible member may hang from the roller (e.g., a drooping portion). When the drooping portion of the flexible member completely covers the window, the curtain (e.g., a blackout curtain) is said to be closed. When the drooping portion of the flexible member is wound to its maximum extent (e.g., completely wound onto the roller), the curtain (e.g., a blackout curtain) is said to be open. It is understood that there are multiple positions between open and closed, each position having an associated drooping portion of the flexible member having an associated weight due to an associated load generated by gravity.

[0021] Figure 1A A perspective view of an exemplary motorized blind (such as a motorized roller blind 1) is shown. The motorized roller blind 1 may include a covering material 2 (e.g., a flexible material, such as a blackout fabric) wound and received on a roller tube 3. The roller tube 3 may extend from a first end 3a to a second end 3b. A longitudinal axis 4 may extend from the first end 3a to the second end 3b of the roller tube 3. The roller tube 3 may be rotatably supported by a mounting bracket 5, which may be attached to a structure adjacent to the window that can be covered by the covering material 2 (e.g., a wall or ceiling). The roller tube 3 may be constructed of any suitable material, such as aluminum, stainless steel, or plastic.

[0022] The lower control rod 6 can be attached to the lower edge of the cover material 2 and is oriented parallel to the lower edge of the cover material. The lower control rod 6 can be configured to cause the cover material 2 to hang down. Rotation of the reel 3 about the longitudinal axis 4 can cause the cover material 2 to be wound onto or unwound from the reel to raise and lower the lower control rod 6.

[0023] The electric roller blind 1 may include a motor drive unit 7 and an idler wheel 8, each configured to be connected to one of the respective mounting brackets 5. The motor drive unit 7 may be located inside or coupled to a first end 3a of the roller tube 3, and the idler wheel 8 may be coupled to a second end 3b of the roller tube. The motor drive unit 7 may include a motor (not shown) and may be configured to hold the covering material 2 in any position between a fully closed and fully open position, the motor being configured to rotate the roller tube 3 to adjust the covering material 2 between the fully closed and fully open positions. The idler wheel 8 may be coupled to the roller tube 3 (e.g., at the second end 3b) to allow the roller tube to rotate relative to the mounting bracket 5 when the motor drive unit 7 rotates the roller tube. The motor of the motor drive unit 7 may be any suitable drive element, such as a DC motor, AC motor, or stepper motor. The electric roller blind 1 may include one or more batteries (not shown) configured to power the motor drive unit 7. Alternatively or additionally, the motor drive unit 7 may be configured to be connected to the electrical system of the building in which the electric roller blind 1 is installed. For example, the motorized roller blind 1 may include a cable configured to connect to an electrical system. The motor drive unit 7 may also include wireless communication circuitry for receiving wireless signals (e.g., RF signals), such as a radio frequency (RF) receiver or transceiver. The motor drive unit 7 may be configured to raise and lower the lower swing arm 6 in response to commands received via wireless signals to control the amount of daylight entering the space.

[0024] Turning Figure 1B The diagram shows a drive assembly 10 (also referred to herein as a motor drive unit), which may be disposed on a reel (not depicted for simplicity, but may be similar to...). Figure 1A The drive assembly 10 may include a housing 12 (also referred to herein as the motor drive unit housing). As shown, a portion of the housing 12 (e.g., the top portion here) has been removed. The drive assembly 10 may include a drive motor 14 and a gear assembly 16. The housing 12 may hold the drive motor 14 and the gear assembly 16. The drive assembly 10, and therefore the drive motor 14, may be configured to receive power from a direct current (DC) supply and / or an alternating current (AC) supply. Power may be supplied by wires (e.g., a power supply / power source connected to the outside of the motorized curtain) or by a power supply / power source integrated with the motorized curtain. For example, the integrated power supply may be one or more batteries that can be disposed within the roller tube. As another example or further example, the power supply / power source may be a photovoltaic power source, such as a solar cell.

[0025] The drive assembly 10 may also include an electronic drive unit 18 configured to control the operation of the drive motor 14. For example, the electronic drive unit 18 may receive commands (e.g., commands ultimately from a user wishing to change the position of the flexible material) via a remote control unit or other external system controller that causes the operation of the drive motor 14. For example, the electronic drive unit 18 may receive commands that cause it to control the operation of the drive motor 14 to move in the rotational direction that causes the motorized curtains to open. For example, the electronic drive unit 18 may receive commands that cause it to control the operation of the drive motor 14 to move in the rotational direction that causes the motorized curtains to close. A printed circuit board 20 may be provided for mounting the control circuitry (not depicted) of the electronic drive unit 18. The drive assembly 10 may also include a bearing housing 22 and a bearing spindle 24 disposed at a first end of the housing 12 of the drive assembly 10 to engage with the inner surface (not depicted) of a first end of the reel, and to allow the reel to rotate relative to the housing 12 of the drive assembly. The drive assembly 10 may also include a mechanism 25 that interfaces or connects the housing 12 of the drive assembly to a mounting bracket (not depicted). According to one example, the housing 12 may be fixed / not rotated relative to the mounting bracket.

[0026] The drive assembly 10 may also include a drive disk 26 disposed at a second end of the housing 12. The drive disk 26 may include multiple features (such as longitudinal grooves) to facilitate engagement between the outer surface of the drive disk 26 and the inner surface (not depicted) of the second end of the tubing when the drive assembly 10 is received within the tubing. The drive disk 26 may be fixedly connected to a disk shaft 28, which is rotatably supported relative to the housing 12 by a drive bearing 30. The disk shaft 28 may be operatively connected to a gear assembly 16 such that actuating the drive motor 14 rotates the gear assembly and thus actuates the drive shaft, thereby rotating the drive disk 26. The drive disk 26 then rotates the tubing, thus winding, for example, a flexible member onto and unwinding it from the tubing.

[0027] The drive assembly 10 may also include a braking assembly 32, which may be disposed within the housing 12 and receive the disc shaft 28. While a buffer spring may be used, for example, to balance the motorized blinds to reduce the force required to wind the flexible member, it is understood that the weight of the flexible member cannot always be perfectly balanced in all positions of the motorized blinds. Therefore, even spring-balanced motorized blinds may still require a braking assembly to hold the flexible member in a selected position. As will be discussed, the braking assembly 32 is engaged when the motor is not in use. The braking assembly 32 is disengaged when the motor is rotating the roller to, for example, a relatively closed position or a relatively open position of the blackout curtain.

[0028] Braking assembly 32 may include a brake input 34, a brake output 36, a brake spring 38, and a brake spindle 40 (also referred to herein as a spindle). A portion of the brake spindle 40 protrudes toward the drive disc 26 and is surrounded by the brake input 34, the brake output 36, and the brake spring 38. The brake spindle 40 may be held by the housing 12 and does not rotate relative to the housing, and is therefore also referred to herein as a non-rotating spindle. The gear cover 42 of the gear assembly 16 may be arranged adjacent to the brake spindle 40. A motor adapter 44 may be disposed between the motor 14 and the gear cover 42 and may connect the output of the motor to the gear assembly 16. In operation, the disc shaft 28 may pass through the braking assembly 32, which may be adapted to engage with the disc shaft to prevent relative rotation between the motor 14 and the drive disc 26 when the flexible member is not being wound / unwound (e.g., when a blackout curtain is not being used). It should be understood that the reel is subjected to a load (e.g., a gravitational load) due to the weight of the extended portion of the flexible member (not depicted) and the optional lower swing arm (if present). The engagement braking assembly 32 resists said load and prevents the flexible member from unfolding (e.g., when the blackout curtain is not in use).

[0029] Now for reference Figure 1C The brake spring 38 may be formed of wire (such as a section of wire) and may include multiple (e.g., two or more) turns or coils 38a. Both the diameter of the wire and the number of turns can affect the brake resistance. The brake spring 38 may terminate at each corresponding end of the bend 38b, thereby forming a shank 38c with a distal end 38d. The brake spring 38 may be mounted on the brake spindle 40. The brake spring 38 may have an inner diameter or inner diameter 38e defined by the innermost surface of the plurality of coils 38a. When the spring is in the relaxed state, the diameter 38e may be slightly smaller than that of the brake spindle 40. Figure 1B The brake input 34 and brake output 36 are each rotatable and adapted to engage at least one of the legs 38c of the brake spring 38. When the brake input 34 rotates in either direction, it pushes one or more of the legs 38c, thereby releasing the brake spring 38 (e.g., increasing the internal diameter defined by the plurality of coils 38a). The brake spring 38 then slides on a non-rotating spindle, thereby allowing the brake input 34 to drive the brake output 36.

[0030] When the brake input 34 is not rotating, gravity can generate a load / force on the flexible member, which, if left unchecked, can cause the flexible member to unfold and subsequently lower its position. In response, this load can cause the brake output 36 to push one or more of the lever feet 38c, thereby “reverse-driving” the brake spring 38. Reverse-driving the brake spring 38 reduces the internal diameter 38e defined by the plurality of coils 38a, and the brake spring 38 can be tightly clamped onto the brake spindle 40, thereby preventing rotation of the brake output 36 and thus preventing rotation of the disc shaft 28. Thus, the brake assembly 32 holds the flexible member in place.

[0031] One problem with the brake spring 38 is that the foot 38c may bend, for example, at the bend 38b. Each of the feet 38c is essentially a cantilever, which bears the full force when the brake spring 38 is driven back, which can, for example, cause the foot 38c to bend and thus cause the brake assembly to slip and the flexible member to move undesirably beyond the desired position. To compensate for and prevent the foot 38c from bending, a heavier spring wire can be used to form the brake spring 38. However, a heavier wire can cause the brake spring 38 to have significant resistance (e.g., against a non-rotating spindle) when the brake input 34 drives the brake output, because it is more difficult for the brake input to release the brake spring 38 (e.g., by increasing the internal diameter 38e defined by the multiple coils 38a) and therefore more difficult for the brake spring 38 to slide on the non-rotating spindle. As an example, this resistance can cause energy efficiency problems. For example, in the case of a battery-powered sunshade, when using a brake spring (such as... Figure 1C When the brake spring 38 is in operation, the operating friction between the brake spring 38 and the brake spindle 40 can consume the same amount of battery energy as the moving blackout curtain.

[0032] Therefore, there is a need to improve the braking assembly of motorized blinds (including battery-powered blackout blinds) that employ, for example, an electric roller system, improve the braking spring of the braking assembly, and reduce the brake resistance in the braking assembly of the motorized blinds.

[0033] Figure 2 A brake spring 46 is depicted. The brake spring 46 may comprise wire forming a plurality of coils 46a. The number of coils and the diameter of the wire may be determined based on the required resistance for the blackout curtain application (e.g., using equations E1 and E2 described herein to determine the required performance). The plurality of coils 46a may terminate at a first bend 46b, a foot 46c, a second bend 46d, a support portion 46e, and a tip 46f (collectively referred to as the foot assembly). Various shapes of the foot assembly are envisioned, such as... Figure 2 and Figures 3 to 8 The handle assembly can be described as roughly L-shaped.

[0034] The first bend 46b is configured such that the shank 46c extends radially from the plurality of coils 46a, which allows interaction with the input or output member, referencing Figures 3 to 8 This is described in detail. The brake spring 46 has an inner diameter or inner diameter 46g. The inner diameter or inner diameter 46g varies depending on whether the brake spring 46 is in the relaxed state or the reciprocating state.

[0035] As depicted, the foot assemblies are mirror images of each other and have substantially the same geometry. The relative circumferential position of the foot assemblies is determined by the length (e.g., number of turns) of the wire forming the brake spring 46. A second bend 46d, a support portion 46e, and a tip 46f are positioned behind the foot 46c. When force is applied to the foot, the support portion 46e supports the foot 46c. The support portion 46e may engage with an input member (such as, to be described as, input member 62 or input member 92). Because stress is distributed between the first bend and the support portion, the support portion 46e greatly reduces the risk of the foot 46c bending (or even breaking), for example, at the first bend 46b. Having the foot 46c supported by the support portion 46e allows the brake spring 46 to use a smaller wire diameter, which generates less resistance when the brake spring 46 rotates about its spindle in the actuated state.

[0036] Figure 3 and Figure 4 A braking assembly 50 suitable for use in motorized blinds, such as those associated with an electric roller shutter system, is depicted. As an example, the braking assembly 50 may, for example, replace... Figure 1B The braking component 32 of the drive assembly 10 is used within the drive assembly. For illustrative purposes only, the drive assembly 10 (…) Figure 1B The operation of the braking assembly 50 is described using the following description: The engagement of the braking assembly 50 resists the gravitational load / force associated with the drooping portion of the flexible member and prevents the flexible member from unfolding when the curtain is stationary (e.g., the motor is not actuated).

[0037] Braking assembly 50 includes a spindle 52. Braking spindle 52 may include a base 54, which may include auxiliary attachments within a drive assembly (such as the housing 12 of drive assembly 10). Figure 1B The base 54 of the braking assembly 50 can be securely attached to the housing 12 of the drive assembly 10 such that the brake spindle 52 does not rotate relative to the housing. In this way, the brake spindle 52 may also be referred to herein as a non-rotating spindle. The body 56 may extend from the base 54. The body 56 may be annular in shape. The body 56 may have a distal portion 58.

[0038] The distal portion 58 may also be annular or coaxial with the main body 56, or more thereof. The distal portion 58 may include a receiving spring 60 (the spring 60 may be substantially similar to...). Figure 2 The outer surface 58a of the brake spring 46. The distal portion 58 may also define a hole 58b that extends completely through the brake spindle 52. Multiple ribs 58c may be provided within the hole 58b. Figure 4 Three are shown, but there may be more or fewer than three. Ribs 58c may extend parallel to the axis defined by the hole 58b and may extend at least as long as, for example, the length of the distal portion 58. As another example, the plurality of ribs 58c may extend the entire length of the hole 58b (e.g., the length of the hole as represented by the length of the brake spindle 52). Drive shaft ( Figure 3 and Figure 4 (Not depicted) passes through hole 58b, but does not contact the plurality of ribs 58c, thereby allowing the drive shaft to rotate freely within the brake spindle.

[0039] The brake spring 60 may include a plurality of coils or turns of wire 60a. The brake spring may be disposed about a spindle 52 and positioned on a surface 58a of the body 56 of the spindle. The brake spring 60 may have an inner diameter or inner diameter 60g defined by the innermost surface of the plurality of coils 60a. When in a relaxed state, the diameter 60g may be slightly smaller than the diameter 58d of the distal portion 58 of the body 56 (e.g., the diameter 58d may extend to the surface 58a). In a first rotational state, as will be described, the brake spring 60 may be tensioned (e.g., driven back) and may engage tightly with the surface 58a of the distal portion 58, thereby preventing relative rotation between the brake spring 60 and the brake spindle 52. This, in turn, prevents rotation of the drive shaft and thus the reel, and thereby prevents flexible components such as those unwinding from the reel due to gravity. Therefore, the first rotational state of the brake spring 60 may be a non-rotational state relative to the surface 58a of the spindle 52.

[0040] In the second rotational state, as will be described, the brake spring 60 can be forcibly released (e.g., driven open, thereby increasing the inner diameter 60g of the brake spring), thus allowing relative rotation between the brake spring 60 and the spindle 52. However, since the diameter 60g can (e.g., still can) be slightly smaller than the diameter 58d of the distal portion 58 of the body 56, some associated resistance will exist. In this second rotational state, the motor 14 of the drive assembly 10 can drive / rotate the disc shaft 28 and thus drive / rotate the drive disc 26 and the roller tube, thereby driving the flexible member to a new position, causing the curtain to open or close further. Therefore, the second rotational state of the brake spring 60 can involve clockwise or counterclockwise rotation of the brake spring relative to the surface 58a of the spindle 52, and can be referred to as the driven state.

[0041] The braking spring 60 may include wire forming the plurality of coils 60a. The diameter (e.g., thickness) of the wire and the number of coils (e.g., turns) may be determined based on the desired application, for example using equation E1 (e.g., reducing the resistance of a blackout curtain at a constant speed) and equation E2 (raising the resistance of a blackout curtain):

[0042] Equation E1

[0043] Equation E2

[0044] in:

[0045] E = Elastic modulus of the brake spring

[0046] h = wire diameter

[0047] D = Outer diameter of the axial length (OD)

[0048] I = 1 / 4*π(h / 2) 4

[0049] Δ = Outer diameter of the spindle (OD) - Inner diameter of the spring (ID)

[0050] N = Number of turns

[0051] μ = coefficient of friction

[0052] For example, observation Figure 4 The outer diameter (OD) of the mandrel can be the diameter between the two furthest points of separation on surface 58a (e.g., diameter 58d). For example, the inner diameter of the spring can refer to the diameter 60g defined between the innermost surfaces of the plurality of coils 60a. The coefficient of friction can be between the mandrel material and the wire material.

[0053] The plurality of coils 60a may terminate at a radially first bend 60b. As depicted, the first bend 60b may be a vertical or 90-degree bend, but it is understood that the first bend may be a gradual curve or a series of curves. A foot 60c may extend from the first bend 60b. A second bend 60d may be provided at the end of the foot 60c, for example, after the foot. The second bend 60d may be opposite to the first bend 60b. As depicted, the second bend 60d may be a vertical or 90-degree bend, but it is understood that the second bend may be a gradual curve or a series of curves. A support portion 60e may be provided after the second bend 60d, and the support portion terminates at a tip 60f, which is the distal end of the brake spring 60 (see...). Figure 3 ).

[0054] When a force is applied to the foot, the support portion 60e can support the foot 60c. The force can be applied to a portion of the foot 60c or substantially all of the foot. Examples of forces acting on the foot 60c may include a first force applied to drive the plurality of coils 60a back, thereby causing the diameter 60g of the spring to contract and the coils to engage with the surface 58a of the spindle 52; and a second force applied to relax the plurality of coils, thereby causing the diameter 60g of the spring to expand and the coils to slide relative to the surface 58a of the spindle.

[0055] For reference Figure 1C As discussed in the brake spring 38, the handle (e.g., handle 38c) acts as a cantilever and is prone to bending, for example, at the bends forming the handle (e.g., bends 38b). A bent handle can cause the flexible component to slowly unfold to a fully closed position after being set to a certain position, which can be inconvenient for consumers. The support portion 60e greatly reduces the force on the handle 60c and thus prevents the handle 60c from bending, for example, at the first bend 60b, because the stress is distributed between the first bend and the support portion 60e. Furthermore, having the handle 60c supported by the support portion 60e allows the brake spring 60 to use a smaller wire diameter, which generates less resistance when the brake spring 60 rotates about its spindle in the driven state. Lower resistance requires less power from the motor, which improves battery life, a consideration / advantage of battery-powered blinds.

[0056] The first curved portion 60b, the foot 60c, the second curved portion 60d, the support portion 60e, and the tip 60f can be collectively referred to as the foot assembly. Although Figure 3 and Figure 4 Only one shank assembly is visible, but it should be understood that substantially similar arrangements may exist on the other ends of the plurality of coils 60a (e.g., see [reference]). Figure 2 In some embodiments, the foot assemblies may be mirror images of each other (e.g., one pointing in the opposite direction; for example, if one foot assembly points clockwise when viewed from the end (e.g., along the axis defined by the distal portion 58 of the spindle), the other foot assembly points counterclockwise). In some embodiments, the geometry of each of the foot assemblies is different. In any case, the relative circumferential position of the foot assemblies is determined by the length of the wire forming the brake spring 60 (e.g., the number of turns).

[0057] The braking assembly 50 may also include an input member 62. The input member 62 may include an annular base 64 defining a bore 64a. A coupling 66 may be disposed in the bore 64a. The coupling 66 may define a bore 66a adapted to engage with a drive shaft. Figure 3 and Figure 4(Not depicted) to rotate the input member 62 about an axis coaxial with the hole 66a. Movement is applied to the disk (e.g., such as) in the first rotational direction of the drive shaft and therefore the input member 62. Figure 1B The drive disc 26 engages with the reel so that the flexible member is wound around the reel and raised. In the opposite rotational direction of the drive shaft and therefore the input member 62, the flexible member unfolds from the reel and the drive shaft and is thus lowered. For clarity, the brake spring 60 is in an actuated state in both rotational directions of the input member 62, as will be described. The bore 66a may have features that engage with the drive shaft (e.g., spline), but other mechanisms may be used.

[0058] A body 68 may extend from the base 64 of the input member 62 in the direction of the brake spring 60 and the spindle 52. The body 68 may be annular in shape. The body 68 may have a first surface 68a. A mating surface 68b may be provided on the body 68 to engage with a portion of the output member 70, the mating surface being perpendicular to surface 68a. A sidewall 68c may extend from the body 68 in the direction of the brake spring 60 and the spindle 52. A recessed surface 68d may be adjacent to the sidewall 68c and recessed or gradually lowered relative to the sidewall 68c. The recessed surface 68d may receive a portion of the brake spring 60, such as a support portion 60e and a tip 60f. The recessed surface 68d may support the support portion 60e and the tip 60f of the brake spring 60, thereby reducing the stress exerted on the first bend 60b by the force acting on the foot 60c.

[0059] When the brake assembly 50 is in the second rotational state, the edge 68e of the body 68 may be adjacent to the recessed surface 68d to engage with a portion of the brake spring 60 (such as the foot 60c). The input member 62 may be symmetrical, for example, it may have similar features provided on the other side of the brake assembly 50 to engage with another foot assembly.

[0060] As an example, when the motor of the electric blind is actuated to raise or lower the flexible member, the drive shaft can rotate the input member 62. The rotation of the input member 62 causes the edge 68e to exert a force on the foot 60c, thereby driving the brake spring 60, causing the brake spring to enlarge and disengage from (or at least slide relative to) the surface 58a of the spindle 52 (e.g., the diameter 60g becomes larger), and allowing the drive shaft (and thus the disc, and consequently the coil and flexible material) to rotate freely relative to the spindle. The stress experienced by the first bend 60b of the brake spring 60 due to the force applied to the foot 60c can be partially offset by the support portion 60e, which engages with the recessed surface 68d of the input member 62.

[0061] The braking assembly 50 also includes an output member 70. In some embodiments, unlike the braking spring 60 and the input member 62, the output member 70 may be asymmetrical. However, having a symmetrical output member 70 may be advantageous, for example, for general compatibility with right-hand or left-hand configurations of the curtain.

[0062] The output member 70 includes an annular base 72 defining a hole 72a. The hole 72a is adapted to receive a disk shaft. Figure 3 and Figure 4 (not depicted in the text), the disk shaft is connected to a disk that engages with the reel (e.g., such as...). Figure 1B (Drive disc 26). A plurality of ribs 74 may extend radially from the base 72. Several of the plurality of ribs 74 also extend axially in the direction of the input member 62, the brake spring 60, and the spindle 52. The plurality of ribs 74 may not be identical; for example, the plurality of ribs may not all have the same length. When the brake assembly 50 is in a first rotational state, an engagement surface 74a may be provided on one of the plurality of ribs 74 to engage with the foot 60c of the brake spring 60. For example, the input member and the output member may engage with opposite sides of the foot 60c.

[0063] For example, when the motor of the electric blind is not actuated, a gravitational load is applied to the roller due to the weight of the unfolded (e.g., drooping) portion of the flexible member. This load is transmitted to the disc and then via the disc shaft to the output member 70. Rotation of the output member 70 causes the engagement surface 74a to exert a force on the foot 60c to drive the brake spring 60 back, thereby causing the brake spring to engage with the surface 58a of the spindle 52 (e.g., the diameter 60g becomes smaller), thus stopping the rotation of the brake spring, the output member, and the disc and thereby preventing the flexible member from unfolding. The stress experienced by the first bent portion 60b of the brake spring 60 due to the force applied to the foot 60c is partially offset by the support portion 60e, which engages with the recessed surface 68d of the input member 62.

[0064] The body 76 extends from the base 72 of the output member 70 in the direction of the input member 62, the brake spring 60, and the spindle 52. One or more of the plurality of ribs 74 are also attached to the body 76. A sidewall 76a extends axially from the body 76 in the direction of the input member 62, the brake spring 60, and the spindle 52. The sidewall 76a may be disposed between a portion of the plurality of ribs 74. A mating surface 76b may be disposed on the body 76 (e.g., on the side of the rib away from the sidewall 76a) to engage with the mating surface 68b of the input member 62. When driven by a motor in a first rotational direction, the input member 62 rotates (clockwise, as shown) such that the mating surface 68b contacts the mating surface 76b and thus causes the output member 70 to rotate, wherein the disk shaft applies the rotation of the output member to the disk, thereby winding or unwinding the flexible member according to the rotational direction of the motor.

[0065] exist Figure 3 As seen in the image, the sidewall 68c and recessed surface 68d of the input member 62 cover a portion of the plurality of coils 60a, a portion of the body 56 of the spindle 52, and the distal portion 58. The support portion 60e and tip 60f of the brake spring 60 engage with the recessed surface 68d. The sidewall 76a of the output member 70 covers another portion of the plurality of coils 60a, a portion of the body 56 of the spindle 52 and the distal portion 58, as well as the base 64 and surface 68a of the input member 62. Because the sidewall 68c and recessed surface 68d of the input member 62 and the sidewall 76a of the output member 70 cover most of the plurality of coils 60a, therefore... Figure 3 Only a portion of the brake spring 60's foot 60c, the second bend 60d, the support portion 60e, and the tip 60f can be seen.

[0066] In operation, as will be discussed, the brake assembly 50 is engaged when the motor is not in use. The brake assembly 50 is disengaged when the motor is rotating the roller to, for example, a relatively closed position or a relatively open position of the curtains. Although some resistance is associated with the brake assembly 50, this resistance is less than conventional amounts (such as, for example...). Figure 1C The spring can withstand less resistance (for example, because the spring with the support portion can use a smaller diameter wire), and therefore requires less energy to overcome. The braking assembly 50 is particularly suitable for battery-powered blinds (including spring-balanced motorized blinds (e.g., spring-balanced battery-powered blackout blinds)), such as battery-powered blackout blinds. The braking assembly 50 can be associated with extended battery life for battery-powered blinds.

[0067] In the first rotational state, the force of gravity acting on the flexible member tightens the brake spring 60, and the engagement surface 74a of the output member 70 applies force to the handle 60c to drive the brake spring back and engage it with the surface 58a of the spindle 52, thereby stopping the rotation of the brake spring, the output member, and the disk, and thus preventing the flexible member from unfolding. In the second rotational state, the motor acts on the drive shaft (e.g., clockwise or counterclockwise) to rotate the input member 62, causing the edge 68e to apply force to the handle 60c of the brake spring 60, thereby releasing the brake spring and allowing the brake spring, the output member 70 (through the engagement surface 68b contacting the engagement surface 76b), and the disk to rotate. Therefore, the motor can drive the flexible member to a new position, causing the curtain (e.g., flexible material) to open or close further.

[0068] Figure 5 and Figure 6The braking assembly 80 is depicted in a first rotational state, which may be referred to as a locked state. The braking assembly 80 may be... Figure 3 and Figure 4 An example of the braking assembly 50 is depicted. The braking assembly 80 can be installed in either end of the roller tube. For example, there are right-hand side or left-hand side configurations of the curtain (refer to the arrangement of the braking assembly 80 in the roller tube). A symmetrical design would be advantageous, for example, if installed on the right end of the roller tube, a different handle assembly would serve as the locking element, while if the braking assembly is installed on the left end of the roller tube, another handle assembly would serve as the locking element.

[0069] The braking assembly 80 includes a spindle 82. The spindle 82 includes a base 84 and a body 86 extending from the base 84. The body 86 may have a distal portion 88, which includes an outer surface 88a for receiving a brake spring 90. The distal portion 88 defines a bore 88b. A plurality of ribs 88c may be disposed within the bore 88b. Figure 6 (Three ribs are shown in the figure) and extend parallel to the axis defined by the hole.

[0070] A brake spring 90 is positioned on a surface 88a of the distal portion 88 of the spindle 82. In a first rotational state (as depicted), the brake spring 90 is tensioned and tightly engaged with surface 88a, thereby preventing relative rotation between the brake spring 90 and the spindle 82. The brake spring 90 may comprise wire forming a plurality of coils 90a. The number of coils and the diameter of the wire may be determined based on the curtain application (e.g., using equations E1 and E2 described herein to determine the desired performance). The plurality of coils 90a may terminate at a pair of foot assemblies (a first foot assembly and a second foot assembly), the first foot assembly including a first bend 90b, a foot 90c, a second bend 90d, a support portion 90e, and a tip 90f, and the second foot assembly including a first bend 90'b, a foot 90'c, a second bend 90'd, a support portion 90'e, and a tip 90'f. As depicted, the foot assemblies are mirror images of each other and have substantially the same geometry. The relative circumferential position of the foot assembly is determined by the length of the wire forming the brake spring 90 (e.g., the number of turns). Any description relating to 90b to 9f may also apply to 90'a to 90'f, but for ease of explanation, only the former will be discussed below.

[0071] Note that the second bend 90d, the support portion 90e, and the tip 90f are positioned after the foot 90c. When force is applied to the foot, the support portion 90e supports the foot 90c. Because the stress is distributed between the first bend and the support portion, the support portion 90e significantly reduces the bending of the foot 90c, for example, at the first bend 90b. According to another example, having the foot 90c supported by the support portion 90e allows the brake spring 90 to use a smaller wire diameter, which generates less resistance when the brake spring 90 rotates about its spindle in the driven state. Lower resistance requires less power from the motor, which improves battery life, a very important consideration for battery-powered blinds.

[0072] The braking assembly 80 also includes an input member 92. The input member 92 defines an aperture (not visible) that holds a coupling 96, which defines an aperture 96a adapted to engage with a drive shaft (not depicted). The drive shaft is adapted to be driven by a motor to rotate the input member 92; however, in the depicted first rotational state, the motor is not actuated. The input member 92 includes a body 98 having sidewalls 98c. A recessed surface 98d is adjacent to and gradually slopes down from the sidewalls 98c to receive a support portion 90e and a tip 90f of a brake spring 90. An edge 98e of the body 98 is adjacent to the recessed surface 98d to accommodate the brake assembly 80 in a second rotational state (…). Figure 8 When engaged with a portion of the brake spring 90 (such as the foot 90c), the input member 92 is symmetrical and therefore has a recessed surface 98'd and an edge 98'e, for example, to accommodate a second foot assembly, which includes a first bend 90'b, a foot 90'c, a second bend 90'd, a support portion 90'e, and a tip 90'f.

[0073] The braking assembly 80 also includes an output member 100. The output member 100 includes an annular base 102 that defines a hole adapted to receive a drive shaft (not depicted). Figure 5 and Figure 6 (Not shown in the image), the drive shaft can be coupled to a disc (such as drive disc 26) that engages with the reel (not depicted). A plurality of ribs 104 can extend radially from the base 102. Several of the plurality of ribs 104 can also extend axially in the direction of the input member 92, the brake spring 90, and the spindle 82. When the brake assembly 80 is in the first rotational state ( Figure 6 The engagement surface 104a may be provided on one of the plurality of ribs 104 to engage with the foot 90c of the brake spring 90.

[0074] The main body 106 extends from the base 102 in the direction of the input member 92, the brake spring 90, and the spindle 82. The plurality of ribs 104 are also attached to the main body 106. Sidewalls 106a extend axially from the main body 106 in the direction of the input member 92, the brake spring 90, and the spindle 82. Sidewalls 106a may be disposed between portions of the plurality of ribs 104. Engaging surfaces 106b may be disposed on the main body 106 to engage with engagement surfaces 98b of the main body 98 of the input member 92. Figure 5 ) join.

[0075] During operation, a gravitational load is applied to the reel due to the weight of the unwound (e.g., sagging) portion of the flexible member. This load is transmitted to the disk and subsequently via a drive shaft (such as disk shaft 28). Figure 1B The force is transmitted to the output member 100. Rotation of the output member 100 causes the engagement surface 104a to apply force to the foot 90c, driving the brake spring 90 back, thereby engaging the plurality of coils 90a with the surface 88a of the spindle 82, thus stopping the rotation of the brake spring, the output member, and the disc, and thereby preventing the flexible member from unfolding. The stress experienced by the first bend 90b of the brake spring 90 due to the force applied to the foot 90c is partially offset by the support portion 90e, which engages with the recessed surface 98d of the input member 92. Since the stress is distributed between the first bend and the support portion, the support portion 90e greatly reduces the force on the foot 90c and thus prevents the foot 90c from bending, for example, at the first bend 90b. The support portion 90e can slide along the recessed surface 98d.

[0076] Figure 7 and Figure 8 The braking assembly 80 in a second rotational state is depicted; the braking assembly has been previously described and uses the same reference numerals. This second rotational state may be referred to as the driven state. The motor has driven the drive shaft to rotate the input member 92 (e.g., in…). Figure 8 (Clockwise rotation). This causes the edge 98e of the input member 92 to apply force to the foot 90c of the brake spring 90, thereby releasing the brake spring (e.g., the inner diameter of the plurality of coils 90a increases in response to the force). The plurality of coils 90a slide relative to the surface 88a of the spindle 82, allowing the brake spring 90, the output member 100, and the disk (not depicted) to rotate. Thus, the motor can drive the flexible member to a new position, causing the curtain to open or close further. The recessed surface 98d supports the support portion 90e of the brake spring 90, thereby reducing the stress on the first bend 90b caused by the force acting on the foot 90c.

[0077] Figure 9AA brake spring 110 according to another embodiment is depicted, which can be used in a brake assembly similar to the brake assembly described herein. The brake spring 110 may include wire forming a plurality of coils 110a. The number of coils and the diameter of the wire may be determined based on the curtain application (e.g., using equations E1 and E2 described herein to determine the desired performance). The plurality of coils 110a may terminate at a pair of foot assemblies, each foot assembly including a first bend 110b, a foot 110c, and a second bend 110d. The first bend 110b is configured such that the foot 110c extends radially from the plurality of coils 110a. In this embodiment, the foot 110c may interact only with the output member. A support portion 110e and a tip 110f are disposed after the second bend 110d. The support portion 110e includes two straight portions divided by the bend. The portion of the support portion 110e in the radial direction of the plurality of coils 110a (e.g., the portion parallel to the shank 110c) may be connected to the input member (such as, in... Figure 8 The tip 110f may engage with an input member 92 at its edge 98e, for example, it may engage only with the input member. The tip 110f may engage with an input member having features similar to the recessed portion (e.g., in...). Figure 8 (at the recessed portion 98e of the input member 92), or preferably, directly engageable with the mandrel (such as the surface 58a of the distal portion 58 of the mandrel 52). Figure 3 The brake spring 110 may have an inner diameter or inner diameter 110g defined by the innermost surface of the plurality of coils 110a. When in the relaxed state, the diameter 110g may be slightly smaller than the mandrel to which it engages (e.g., the surface 58a of the distal portion 58 of the mandrel 52). Figure 3 The diameter of )).

[0078] As depicted, the foot assemblies are mirror images of each other and have substantially the same geometry. The relative circumferential position of the foot assemblies is determined by the length of the wire forming the brake spring 110 (e.g., the number of turns). The second bend 110d, the support portion 110e, and the tip 110f are positioned behind the foot 110c. When a first force (e.g., a locking force applied by the output member, such as in…) is applied… Figure 6 When a second force (e.g., a driving force applied by the input member, such as at the foot) acts on the foot, the support portion 110e and the tip 110f support the foot 110c. Figure 8When the first bend 110b acts on the support portion, it supports the support portion 110e. The stress generated by the force acting on the radial member (e.g., the foot 110c or the support portion 110e) to affect the plurality of coils 110a is reduced because the stress is distributed between two points. For example, the stress is distributed between the first bend 110b and the tip 110f. Having two support points allows the brake spring 110 to use a smaller wire diameter, which generates less resistance when the brake spring 110 rotates about the spindle in the driven state. Figure 9A The handle assembly can be described as roughly U-shaped.

[0079] Figure 9B A brake spring 120 according to another embodiment is depicted, which can be used in a brake assembly similar to the brake assembly described herein. The brake spring 120 may include wire forming a plurality of coils 120a. The number of coils and the diameter of the wire may be determined based on the curtain application (e.g., using equations E1 and E2 described herein to determine the desired performance). The plurality of coils 120a may terminate at a pair of foot assemblies, each foot assembly including a first bend 120b, a foot 120c, and a second bend 120d. The first bend 120b is configured such that the foot 120c extends radially from the plurality of coils 120a. In this embodiment, the foot 120c may interact only with the output member. A support portion 120e and a tip 120f are disposed after the second bend 120d. The support portion 120e includes three straight portions divided by the pair of bends. The portion of the support portion 120e in the radial direction of the plurality of coils 120a (e.g., parallel to the shank 120c) may be connected to the input member (such as, in... Figure 8 The portion of the support portion 120e adjacent to the plurality of coils 120a may engage with an input member having features similar to the recessed portion (e.g., at the edge 98e of the input member 92), for example, it may engage only with the input member. Figure 8 (at the recessed portion 98e of the input member 92), or can be directly engaged with the mandrel (such as the surface 58a of the distal portion 58 of the mandrel 52). Figure 3 The tip 130f can engage with an input member having features similar to the recessed portion. The brake spring 120 may have an inner diameter or inner diameter 120g defined by the innermost surface of the plurality of coils 120a. When in the relaxed state, the diameter 120g may be slightly smaller than the mandrel it engages with (e.g., the surface 58a of the distal portion 58 of the mandrel 52). Figure 3 The diameter of )).

[0080] As depicted, the foot assemblies are mirror images of each other and have substantially the same geometry. The relative circumferential position of the foot assemblies is determined by the length of the wire forming the brake spring 120 (e.g., the number of turns). A second bend 120d, a support portion 120e, and a tip 120f are disposed behind the foot 120c. When a first force (e.g., a locking force) is applied to the foot, the support portion 120e supports the foot 120c. When a second force (e.g., a driving force) is applied to the radial portion of the support portion, the first bend 120b supports the support portion 120e. The stress generated by the force acting on the radial members (e.g., the foot 120c or the support portion 120e) (e.g., affecting the plurality of coils 120a) is reduced because the stress is distributed between two points. For example, the stress is distributed between the first bend 120b and the portion of the support portion 120e adjacent to the plurality of coils 120a. Having two support points allows the brake spring 120 to use a smaller wire diameter, which generates less resistance when the brake spring rotates around the spindle in the driven state. Figure 9C The handle assembly can be described as approximately Ω-shaped.

[0081] Figure 9C A plan view of a brake spring 130 according to another embodiment is depicted, which can be used in a brake assembly similar to the brake assembly described herein. The brake spring 130 may include wire forming a plurality of coils 130a. The number of coils and the diameter of the wire may be determined based on the curtain application (e.g., using equations E1 and E2 described herein to determine the desired performance). The plurality of coils 130a may terminate at a pair of foot assemblies, each foot assembly including a first bend 130b, a foot 130c, and a second bend 130d. In this embodiment, the foot 130c may be shaped like a ring. The foot 130c may engage with an output member on a first side and with an input member on a second (e.g., opposite) side. A support portion 130e and a tip 130f are disposed after the second bend 130d. The support portion 130e may engage with a mandrel (e.g., the same surface of the mandrel that may engage with the plurality of coils). The brake spring 130 may have an inner diameter or inner diameter 130g defined by the innermost surface of the plurality of coils 130a. When in the relaxed state, the diameter 130g may be slightly smaller than the mandrel it engages with (e.g., the surface 58a of the distal portion 58 of the mandrel 52). Figure 3 The diameter of )).

[0082] As depicted, the foot assemblies are mirror images of each other and have substantially the same geometry. The relative circumferential position of the foot assemblies is determined by the length of the wire forming the brake spring 130 (e.g., the number of turns). A second bend 130d, a support portion 130e, and a tip 130f are positioned behind the foot 130c. The support portion 130e supports the foot 130c when a first force (e.g., a locking force) or a second force (e.g., a driving force) is applied to the foot. The stress generated by the force acting on the foot 130c (e.g., affecting the plurality of coils 130a) is reduced because the stress is distributed between two points. For example, the stress is distributed between the first bend 130b and the support portion 130e. Having two support points allows the brake spring 130 to use a smaller wire diameter, which generates less resistance when the brake spring rotates about its spindle in the driven state. Figure 9C The shank assembly can be described as roughly O-shaped.

[0083] The foregoing detailed description has been disclosed with reference to specific embodiments. However, this disclosure is not intended to be exhaustive or limited to the precise forms disclosed. Those skilled in the art will understand that changes can be made to the embodiments described above without departing from the broad inventive concept of the described embodiments. Therefore, this disclosure is intended to cover modifications within the spirit and scope of this disclosure as defined in the appended claims.

Claims

1. A braking assembly for a curtain including an electric roller system, the braking assembly comprising: spindle; as well as A brake spring, the brake spring being disposed on the spindle, the brake spring comprising a plurality of stacked coils and a first foot assembly extending from an end of a first coil on a first side of the plurality of coils, the first foot assembly having in sequence: a first bend; a foot having a first end and a second end, the first end being adjacent to the end of the first coil and the first bend being located at the first end; a second bend at the second end of the foot; and a support portion; And a tip, wherein a first bend is bent in a first direction such that a shank extends radially from a first coil, and a second bend is bent in a second direction opposite to the first direction such that a support portion is coplanar with the first coil and extends from the second bend.

2. The braking assembly of claim 1, wherein in the first rotational position, a first force is applied to the lever foot, thereby driving the braking spring back so that the plurality of coils are tightened on the spindle and rotation between the plurality of coils and the spindle is prevented.

3. The braking assembly of claim 2, further comprising an output member, wherein the first force is gravity.

4. The braking assembly of claim 2, wherein in the second rotational position, a second force is applied to the foot to overcome the first force, thereby causing the plurality of coils to disengage from the spindle and allowing rotation between the plurality of coils and the spindle.

5. The braking assembly of claim 4, further comprising an input member, wherein the second force is power from a motor.

6. The braking assembly of claim 5, wherein in both the first rotational position and the second rotational position, the support portion engages with the input member.

7. The braking assembly of claim 2, wherein the braking spring further comprises a second foot assembly extending from the second coil at the distal end of the second coil on the second side of the plurality of coils opposite to the first side; the second foot assembly is a mirror image of the first foot assembly, the second foot assembly and the first foot assembly each pointing in opposite directions, and a support portion of the second foot assembly being coplanar with the second coil and extending from the foot of the second foot assembly.

8. A curtain, said curtain comprising: A coil for winding a flexible component; as well as A drive assembly is disposed in the reel tube, the drive assembly including a motor, an electronic drive unit, a drive shaft and a braking assembly, the drive shaft rotating a disc connected to the reel tube via a disc shaft; The braking assembly includes: spindle; An input component, which is connected to the drive shaft and is rotatable about the spindle; An output component, which is connected to the disk shaft and is rotatable about the spindle; A brake spring, wherein the brake spring is disposed on the spindle, the brake spring comprising: Multiple coils stacked together; A first handle assembly extends from the end of a first coil on the first side of the brake spring of the plurality of coils. The first handle assembly sequentially includes: a first bend; a handle having a first end and a second end, the first end being adjacent to the end of the first coil and the first bend being located at the first end of the handle; a second bend at the second end of the handle; a support portion; and a tip, wherein the first bend is bent in a first direction such that the handle extends radially from the first coil, and the second bend is bent in a second direction opposite to the first direction such that the support portion is coplanar with the first coil and extends from the second bend to reduce stress on the handle; When the motor is not actuated, the braking assembly prevents the flexible member from unfolding.

9. The curtain of claim 8, wherein the motor is battery powered.

10. The curtain of claim 8, wherein when the motor is not actuated, a first force is applied to the handle in a first rotational position, thereby driving the brake spring back so that the plurality of coils are tightened on the spindle and preventing rotation between the plurality of coils and the spindle.

11. The curtain of claim 10, wherein the first force is the gravity exerted by the drooping portion of the flexible member.

12. The curtain of claim 10, wherein in the second rotational position, a second force is applied to the foot of the curtain to overcome the first force, thereby causing the plurality of coils to loosen on the mandrel and allowing rotation between the plurality of coils and the mandrel.

13. The curtain as claimed in claim 12, wherein the second force is a power source.

14. The curtain of claim 12, wherein in both the first rotational position and the second rotational position, the support portion engages with the input member.

15. The curtain of claim 8, wherein the braking spring further comprises a second handle assembly extending from the second coil at the distal end of the second coil on a second side of the plurality of coils opposite to the first side of the braking spring; the second handle assembly is a mirror image of the first handle assembly, the second handle assembly and the first handle assembly each pointing in opposite directions, and a support portion of the second handle assembly being coplanar with the second coil and extending from the handle of the second handle assembly.

Images