Patent Publication Number: US-2023135103-A1

Title: Leading wire of release wheel of pull cord in a window blind

Description:
BACKGROUND OF THE INVENTION 
     a) Field of the Invention 
     The present invention relates to a leading wire of release wheel of pull cord in a window blind, which provides for the release wheel to define a winding angle to the pull cord in the beginning of winding the pull cord, so that the wound reel can be neatly ordered. 
     b) Description of the Prior Art 
     A window blind set  100  (as shown in  FIG.  1   ) includes a top rail  71 , and a bottom rail  72  disposed below and opposite to the top rail  71 . Slats  74  are connected between the top rail  71  and the bottom rail  72 , and a pull cord  11  is collected into a releasing unit  80  inside the top rail  71  after changing direction through a turning element  73 . The pull cord  11  is also operated by the power from the releasing unit  80 , and is collected and released to open and close the slats  74 . 
     As shown in  FIG.  1 - 1   , the releasing unit  80  is formed by an upper frame plate  81  and a lower frame plate  82 . A power switch wheel  83  and a pick-up wheel  84  are disposed between the upper frame plate  81   and the lower frame plate  82 . The power switch wheel  83  and the pick-up wheel  84  achieve feedback power through elasticity of a constant-pressure coil spring  85 , transmitting reaction to a release wheel  900  on each side thereof to reel the pull cord  11 . Energy from the release wheel  900  on each side connects the pull cord  11 , and links with the power switch wheel  83  and the pick-up wheel  84  to gnaw. 
     Referring to  FIG.  2   , the release wheel  900  is provided with a tread  301 , and an end of the tread  301  is coaxially combined with a spoke  302 . A coaxial gear  303  with linking power is disposed on the tread  301  of the release wheel  900 , and is opened inward with an entanglement hole  304  in an inscribable manner to position a thread end of the pull cord  11  in a hollow space of the wheel body, allowing the thread end to be fastened and fixed reversely. As the inner diameter of the entanglement hole  304  must be enlarged so that the pull cord  11  can pass through the entanglement hole  304  easily, a lower tangent point of the pull cord  11  is close to a lower tangent point of the entanglement hole  304  upon implementation. Therefore, a gap G will be formed between a side of the thread of the pull cord  11  and an inner surface of the spoke  302 . Due to the existence of the gap G, the reeling of a coil  102  of the pull cord  11  will be out of order, especially that there is a very large chance that a first coil  101  will enter into the gap G, which allows the subsequent winding to lose a precession angle that the winding is disorder. After winding by multiple turns, the order of winding is entangled, so that the pull cord  11  moves in non-uniform speed on the segment unit of slat  74  (as shown in  FIG.  1   ) or a speed difference is formed between the pull cord  11  on two sides to lose the levelness of the bottom rail  72 . 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to disclose a leading wire of release wheel of pull cord in a window blind. The leading wire provides for a window blind set with elastic feedback power for collecting, so that in the beginning that a provided spring motor acts on the release wheel of pull cord to reel the pull cord, the winding direction of the pull cord can be defined, allowing the wound reel to be neatly ordered. In addition, an intersected ring edge between a winding hub and an inner spoke side of the release wheel is provided with a winding definer, so that the direction of an initial reeling coil of winding can be defined in advance, thereby making the reel to be neatly ordered. 
     A second object of the present invention is to disclose a leading wire of release wheel of pull cord in a window blind, wherein a piercing hole penetrates two openings front-to-back along an inscribed tangent of winding hub, forming a pass in the middle. 
     A third object of the present invention is to disclose a leading wire of release wheel of pull cord in a window blind, wherein the exit of the piercing hole is oppositely connected with a helicoid slope of helicoid dike provided by a winding definer. 
     A fourth object of the present invention is to disclose a leading wire of release wheel of pull cord in a window blind. The maximum radial height of the winding definer is equal to or smaller than the line width of the pull cord, and the axial width of the winding definer is equal to or smaller than the line width of the pull cord. 
     A fifth object of the present invention is to disclose a leading wire of release wheel of pull cord in a window blind, wherein the winding definer and the release wheel are formed integrally with a plastic material. 
     To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    shows a front view of a conventional window blind set. 
         FIG.  1 - 1    shows a structural diagram of a power unit in the window blind set. 
         FIG.  2    shows a schematic view of operation of a conventional release wheel. 
         FIG.  3    shows a three-dimensional view of an infrastructure of release wheel, according to the present invention. 
         FIG.  4    shows a side structural view of the release wheel having a piercing hole, according to the present invention. 
         FIG.  5    shows a three-dimensional structural view of the release wheel having a winding definer, according to the present invention. 
         FIG.  6    shows a side structural view of the release wheel having the winding definer, according to the present invention. 
         FIG.  7    shows a front view of the present invention, which is transfixed with a pull cord. 
         FIG.  8    shows a schematic view of a gesture in which the winding definer provides for winding the pull cord, according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A leading wire of release wheel of pull cord in a window blind provides for the release wheel to define the winding angle of pull cord in the beginning of winding the pull cord, allowing the wound reel to be neatly ordered. On the release wheel, an intersection between a winding hub and an inner spoke side is opened with a piercing hole along an inscribed tangent, so that an outlet cord at the piercing hole can be close to the inner spoke side. In addition, along a direction in which the cord is wound out on the inner spoke side, a winding definer is further disposed, so that the direction of an initial reeling coil of winding can be defined in advance, thereby making the reel to be neatly ordered. A release wheel is disposed, having a winding hub with a hollow part. Two ends of the winding hub are combined respectively with a spoke, forming a wheel body. Following the angle of an inscribed tangent on the winding hub, a piercing hole is opened to connect the front wheel surface and the rear wheel surface of the winding hub, allowing the initial reeling coil of winding to be close to the inner spoke side. 
     An intersected ring edge on the circumference at a corner between the winding hub and the inner spoke side is provided with a winding definer to define the wiring angle of the initial reeling coil after winding by one turn. 
     Furthermore, the winding definer is disposed on the intersected ring edge at the intersection between the winding hub and the inner spoke side, wherein corresponding to the direction at which the cord exits from the piercing hole, a helicoid dike with a helicoid slope is disposed oppositely. A tip of the helicoid slope is close to the inner spoke side, and a surface of the helicoid slope is a helical plane. 
     The maximum cross section of the winding definer is equal to or smaller than the line width of the pull cord to be used. 
     By the abovementioned basic structures, the initial reeling coil of the winding of the pull cord can be defined linearly at the wiring direction, and the subsequent reel can be wound orderly following the precession direction of the initial reeling coil. 
     The construction of the present invention and the features provided by the present invention are described by referring to following drawings. 
     First of all, as shown in  FIG.  3   , a release wheel  20  is disposed inside a spring motor set of window blind, providing a wheel body for releasing a pull cord. The release wheel  20  is provided with a winding hub  21 , an interior of the winding hub  21  is a hollow part  23 , at least an end of the winding hub  21  is combined with a spoke  24 , and a periphery of the spoke  24  is a linking structure  40 . On a circumference of the winding hub  21 , along an inscribed tangent L which is in tangent and parallel with a horizontal axis, a piercing hole  30 , having a front and rear opening, is opened. In addition, an annular edge on the intersection between the winding hub  21  and the spoke  24  is an intersected ring edge  27 . 
     A curved notch  33  is disposed in the direction of an exited cord at the piercing hole  30 , and an inner edge line  34  on a side is close to the inner spoke side  25  of the spoke  24 . 
     Referring to  FIG.  4   , at least an end of the winding hub  21  of the release wheel  20  is a spoke  24 , and an inner surface of the spoke  24  is an inner spoke side  25 ; whereas, on the winding hub  21 , along an inscribed tangent L, a piercing hole  30  is opened in an inscribed manner. The front and rear of the piercing hole  30  are penetrated with two openings  300 . 
     The provided piercing hole  30  is connected in an inscribed manner on the plane of the winding hub  21  along the inscribed tangent L, and a middle in the passage is opened with a pass  32 . Afront and rear part of the piercing hole  30  can be formed by two conical holes  31  which are connected back-to-back with each other coaxially, and as the middle is contracted inward due to the shape of hole, the pass  32  is formed. 
     Two sets of the piercing hole  30 , passing through a latitude X, are parallel and symmetric to each other. 
     The piercing hole  30  provides for transfixing the pull cord  11  and fixing a thread end. First, a tail end of the pull cord  11  passes through the piercing hole  30  from one opening  300 , and then the end that passes through the piercing hole  30  is tied up with a knot  110 . After pulling back the pull cord  11 , the knot  110  will be stopped unidirectionally as its diameter is larger than the pass  32 , which allows the pull cord  11  to be combined rapidly with the release wheel  20 . 
     Referring to  FIG.  5   , the release wheel  20  is provided with the piercing hole  30  on the intersected ring edge  27  between the winding hub  21  and the inner spoke side  25 . A winding definer  50  surrounds annularly the intersected ring edge  27  of two openings  300  of the piercing hole  30 , and is provided with a helicoid dike  51  corresponding to the direction at which the cord is spinning out of the openings  300  from the piercing hole  30 . An axial surface of the helicoid dike  51  is provided with a helicoid slope  52  which rises up helically. A wedge tip portion  55  of the helicoid slope  52  is close to the inner spoke side  25 , and the surface of helicoid slope  52  can be tilted outward on one side, or can be parallel to a corresponding radial line of a centerline S of the wheel body, such as a precession angle of square thread. 
     Referring to  FIG.  6   , the winding hub  21  provided by the release wheel  20  is transfixed linearly with the piercing hole  30  against an inscribed tangent L, a center of the piercing hole  30  is a pass  32  which provides for fastening and combining a knot  110  that is tied up at one end of the pull cord  11 . 
     There can be two symmetric piercing holes  30 , providing for two pull cords  11  to be combined in a different outlet direction. However, in an ordinary condition, only a single pull cord  11  is wound. 
     The intersected ring edge  27  of the winding hub  21  is annularly combined with the winding definer  50  which is integrally formed with the release wheel  20 . In principle, the height of the winding definer  50 , after subtracting the diameter of the winding hub  21  from the outer diameter of the winding definer  50 , is close to or smaller than the line width of the pull cord  11 . A segment on the two openings  300  of the winding definer  50  is an opposing section  53 , and corresponding to the exit direction of the openings  300 , the helicoid dike  51  with the helicoid slope  52  is disposed oppositely. A root part of the helicoid slope  52  is the wedge tip portion  55  which is disposed close to the inner spoke side  25 . 
     Referring to  FIG.  7    and  FIG.  8   , the release wheel  20  provides for transfixing and winding to the pull cord  11 . The pull cord  11  crosses over the curved notch  33  from a thread end  113  at an outlet of one opening  300  of the piercing hole  30 . An initial reeling coil  111  is wound to the axial helicoid slope  52  of the helicoid dike  51  provided by the winding definer  50  and is then defined by the helicoid slope  52 , forming a winding angle. When the initial reeling coil  111  is wound to a back end of the opening  300 , it can be also defined by the exclusion of the opposing section  53 . After that, the coil will be adjusted that it can be overlapped on a side (right side) next to the initial reeling coil  111  more accurately. Therefore, the formed reel  112  can be defined effectively and the winding can be neatly ordered. 
     For the subsequently wound reel  112  described above, a first turn will be squeezed leftward to a right side of the initial reeling coil  111 , and then the winding angle of the initial reeling coil  111  can be squeezed leftward. Thus, there is a lot of chance that the segment corresponding to an axial dike  54  can be attached onto the axial dike  54  of the helicoid dike  51 . The order of subsequent reel  112  is the same as the abovementioned condition, and in principle, each turn of the wound reel  112  can be wound in a same direction, thereby achieving an orderly winding. 
     The cross section of the helicoid dike  51  and the opposing section  53  is equal to or smaller than the cross section of the pull cord  11 . The helicoid slope  52  rises up helically, and the surface is a helical plane. 
     In the present invention, the piercing hole is transfixed at a location between the winding hub and the inner spoke side along an inscribed tangent or radially. A periphery on a side of the hole body is close to the inner spoke side; hence, the initial reeling coil of the pull cord can be close to the inner spoke side, and the reel can be wound orderly by the definition of the winding definer, after winding sequentially. Therefore, in the process that the release wheel rotates to collect the pull cord, it can prevent from causing a difference in the collection speed of the pull cord due to entanglement and jump, which allows the operation to be run smoothly. 
     It is of course to be understood that the embodiments described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.