Patent Publication Number: US-9896881-B2

Title: Fixing assembly for a shading body

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to a fixing assembly for a shading body and, more particularly, to a fixing assembly for connecting a shading body to an extendable rod of a curtain, shade, or blind for windows, doors or space division. 
     2. Description of the Related Art 
     Curtains, shades, or blinds are widely used in our daily life for adjusting the brightness of a space, protecting privacy, or preventing water from spraying everywhere. Conventionally, a curtain structure having a shading body made of cloth can be conveniently installed by penetrating an extendable rod through the shading body of the curtain structure, with two ends of the extendable rod abutting against two opposite steady surfaces facing each other. Alternatively, another conventional curtain structure is shown in  FIG. 1 . A curtain body  91  and a plurality of rings  92  arranged on a top edge of the curtain body  91  for an extendable rod  93  to extend through are provided. When installing the curtain body  91 , the user can extend the extendable rod  93  penetrating the rings  92  and can abut two ends of the extendable rod  93  against two opposite surfaces of a window frame, door frame, walls, pillars or cabinet, with the two opposite surfaces facing each other. 
     However, the extendable rod and installation manner described above cannot be used along with all types of curtains, blinds, and shades. For a shading body that is not made of cloth, or a shading body that is designed to be folded or rolled up vertically (e.g. a roller shade, Roman shade, Venetian shade or honeycomb shade), an elongated rail is needed for a top part of such shading body to couple with. In installation, the rail is usually fixed adjacent to a window or a door by a bracket or a fastening member, such as a screw, for hanging said shading body. This installation manner is inconvenient, and also leaves screw holes on walls once the curtain, blind, or shade is removed, which may result in a dispute between a tenant and the landlord, which in turn thus largely decreases the possibility of the tenant to choose such shading product. As a result, the types of curtains, blinds, and shades for tenants to choose are greatly limited. 
     SUMMARY OF THE INVENTION 
     It is therefore the objective of this invention to provide a fixing assembly for a shading body that can be assembled with all types of curtains, shades or blinds, with two ends of an extendable rod abutted against two opposite surfaces of a building facing each other. 
     A fixing assembly for a shading body of the present invention includes a fixing rail, an elastic fastener and an extendable rod. A slit is arranged at a top side of the fixing rail. The elastic fastener includes a rod-retaining section and two engaging sections. The rod-retaining section is arranged between the two engaging sections. The elastic fastener is engaged with the fixing rail by the two engaging sections. The rod-retaining section is received in the fixing rail and has two positioning portions. The extendable rod is inserted in the rod-retaining section of the elastic fastener through the slit. The two positioning portions abut against an outer periphery of the extendable rod. 
     In a form shown, the elastic fastener includes an arched portion. An opening is formed at a top end of the arched portion. The arched portion forms a receiving space by the opening for receiving the extendable rod. The two positioning portions are arranged at front and rear ends of the arched portion, respectively. 
     In the form shown, the elastic fastener includes two opposite edges respectively located at left and right sides thereof. Each of the two positioning portions includes two rod-limiting pieces. The two rod-limiting pieces of each of the two positioning portions are bent and respectively extend from the two edges of the elastic fastener toward the receiving space. In addition, top and bottom corners of each rod-limiting piece can be round corners. 
     In the form shown, each of the front and rear ends of the arched portion connects with an exterior coupling part. The exterior coupling part includes a lateral wall, a first covering portion and a second covering portion. The lateral wall is connected to the arched portion and extends toward the top side of the fixing rail. The first covering portion is connected to the lateral wall and extends toward a front side or a rear side of the fixing rail. The first covering portion covers a top face of the fixing rail. The second covering portion is connected to the first covering portion and extends downwards for covering a front face or a rear face of the fixing rail. 
     In the form shown, an engaging portion is arranged at the lateral wall of each exterior coupling part. The engaging portion abuts against an inner face of the top side of the fixing rail. 
     In the form shown, each engaging portion includes two rail-abutting pieces respectively connected to the two edges of the elastic fastener. The two rail-abutting pieces are bent and extend away from the receiving space. In addition, each rail-abutting piece can be tapered downwards to form an inclined edge. 
     In the form shown, a rail-coupling portion is arranged at the second covering portion of each exterior coupling part. The rail-covering portion extends through an outer surface of the fixing rail into a side groove of the fixing rail. 
     In the form shown, a part of the second covering portion of the exterior coupling part bends toward the arched portion to form the rail-coupling portion. 
     In another form shown, each of the front and rear ends of the arched portion connects with an elastic piece. An engaging portion is formed by a distal end of each elastic piece away from the arched portion. The engaging portion abuts against an inner face of the top side of the fixing rail. A portion of each elastic piece bends toward the receiving space to form the positioning portion between two ends of each elastic piece. 
     In the other form shown, each of the front and rear ends of the arched portion connects to an exterior coupling part. The exterior coupling part includes a lateral wall, a first covering portion and a second covering portion. The lateral wall is connected to the arched portion and extends toward the top side of the fixing rail. The first covering portion is connected to the lateral wall and extends toward a front side or a rear side of the fixing rail. The first covering portion covers a top face of the fixing rail. The second covering portion is connected to the first covering portion and extends downwards for covering a front face or a rear face of the fixing rail. 
     In a third form shown, each of the front and rear ends of the arched portion connects to a side-abutting piece. The side-abutting piece extends toward the front side or the rear side of the fixing rail to form an abutting portion. The abutting portion abuts against an inner surface of a bottom side of the fixing rail. The arched portion is located between the engaging portion and the abutting portion. 
     In a fourth form shown, the rod-retaining section of the elastic fastener includes an arched portion. An opening is formed at a top end of the arched portion. The arched portion forms the two positioning portions respectively at two edges thereof adjacent to the opening and a receiving space with the opening for receiving the extendable rod. 
     In the fourth form shown, each engaging section includes a first abutting part, a second abutting part and a third abutting part. The first abutting part connects to the arched portion and extends toward a front side or a rear side of the fixing rail. The second abutting part connects to the first abutting part. A distal end of the second abutting part away from the first abutting part abuts against an inner surface of the top side of the fixing rail. The third abutting part connects to the positioning portion and is bent and extends toward the top side of the fixing rail. An engaging portion is formed by a distal end of the third abutting part away from the positioning portion. The engaging portion abuts against the inner surface of the top side of the fixing rail. 
     In the fourth form shown, the first abutting parts of the two engaging sections extend from a bottom end of the arched portion. The first abutting parts of the two engaging sections connect to each other and abut against an inner surface of a bottom side of the fixing rail. 
     In the fourth form shown, each engaging section further includes a supporting piece arranged between the first abutting part and the third abutting part. Two ends of the supporting piece respectively connect to the arched portion and the second abutting part. 
     In the form shown, the extendable rod includes an outer tube, an inner tube and a sleeve. An end portion of the inner tube is received in the outer tube. The sleeve is fit around the inner tube. 
     According to the above, the fixing assembly for a shading body of the present invention can be assembled with all types of curtains, shades and blinds, and can be installed between two opposite surfaces facing each other of a building by the extendable rod. The installation manner is convenient, and will not leave screw holes on walls once the curtain, blind, or shade is removed. Therefore, such a fixing assembly for a shading body is suitable for a tenant. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will become more fully understood from the detailed description given hereinafter and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein: 
         FIG. 1  is a side view of a conventional fixing assembly for a shading body. 
         FIG. 2  is a perspective and exploded view of a fixing assembly for a shading body according to a first embodiment of the present invention. 
         FIG. 3  is a perspective view of the fixing assembly for the shading body according to the first embodiment of the present invention, with the fixing assembly engaging with a shading body. 
         FIG. 4  is a side, cross sectional view of the fixing assembly for the shading body according to the first embodiment of the present invention which is sectioned at an outer tube thereof. 
         FIG. 5  is a perspective view of an elastic fastener according to the first embodiment of the present invention. 
         FIG. 6  is a partial, exploded view of the fixing assembly for the shading body according to the first embodiment of the present invention, with the fixing assembly engaging with a shading body. 
         FIG. 7  is a cross sectional side view of the fixing assembly for the shading body according to the first embodiment of the present invention which is sectioned at the outer tube overlapping an inner tube. 
         FIG. 8  is a perspective and exploded view of a fixing assembly for a shading body according to a second embodiment of the present invention. 
         FIG. 9  is a perspective view of an elastic fastener according to the second embodiment of the present invention. 
         FIG. 10  is a partial, exploded view of the fixing assembly for the shading body according to the second embodiment of the present invention, with the fixing assembly engaging with a shading body. 
         FIG. 11  is a cross sectional side view of the fixing assembly for the shading body according to the second embodiment of the present invention which is sectioned at the outer tube overlapping an inner tube. 
         FIG. 12  is a perspective and exploded view of a fixing assembly for a shading body according to a third embodiment of the present invention. 
         FIG. 13  is a perspective view of an elastic fastener according to the third embodiment of the present invention. 
         FIG. 14  is a partial, exploded view of the fixing assembly for the shading body according to the third embodiment of the present invention, with the fixing assembly engaging with a shading body. 
         FIG. 15  is a cross sectional side view of the fixing assembly for the shading body according to the third embodiment of the present invention which is sectioned at the outer tube overlapping an inner tube. 
         FIG. 16  is a perspective and exploded view of a fixing assembly for a shading body according to a fourth embodiment of the present invention. 
         FIG. 17  is a perspective view of an elastic fastener according to the fourth embodiment of the present invention. 
         FIG. 18  is a partial, exploded view of the fixing assembly for the shading body according to the four embodiment of the present invention, with the fixing assembly engaging with a shading body. 
         FIG. 19  is a cross sectional side view of the fixing assembly for the shading body according to the four embodiment of the present invention which is sectioned at the outer tube overlapping an inner tube. 
     
    
    
     In the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the terms “first”, “second”, “third”, “fourth”, “inner”, “outer”, “top”, “bottom”, “front”, “rear”, “right”, “left” and similar terms are used hereinafter, it should be understood that these terms have reference only to the structure shown in the drawings as it would appear to a person viewing the drawings, and are utilized only to facilitate describing the invention. 
     DETAILED DESCRIPTION OF THE INVENTION 
     Please refer to  FIG. 2 , which shows a fixing assembly for a shading body according to a first embodiment of the present invention. The fixing assembly for the shading body includes a fixing rail  1 , at least one elastic fastener  2  and an extendable rod  3 . The fixing rail  1  is coupled with the extendable rod  3  by the elastic fastener  2 . 
     The terms “left”, “right”, “top”, “bottom”, “front” and “rear” used hereinafter in this specification refer to the orientation of the figures, and are relative to an exit where the fixing assembly for shading body is installed on, such as a door or window. Namely, “left” and “right” directions are relative to an axial direction of the extendable rod  3  shown in the figures. “Front” and “rear” are relative to a radial direction of the extendable rod  3  shown in the figures, which are horizontal directions when the extendable rod  3  is positioned. “Top” and “bottom” are relative to another radial direction of the extendable rod  3  shown in the figures, which are vertical directions when the extendable rod  3  is fixed. 
     Please refer to  FIGS. 2 and 3 , the fixing rail  1  is hollow and includes a bottom side for a shading body “C” to couple with. The shading body “C” can be a cloth curtain, beaded curtain, roller shade, Roman shade, Venetian shade or honeycomb shade. As shown in  FIG. 3 , the shading body “C” in this embodiment is a honeycomb shade, but is not thus limited. A slit  11  is formed at a top side of the fixing rail  1 , such that an interior space of the fixing rail  1  intercommunicates with an exterior space out of the fixing rail  1  via the slit  11 . As such, the extendable rod  3  can be inserted into the fixing rail  1  through the slit  11 . 
     The elastic fastener  2  can be in any structure that is capable of engaging with the fixing rail  1  and the extendable rod  3 . As shown in  FIG. 4 , the elastic fastener  2  substantially includes a rod-retaining section  2   a  and two engaging sections  2   b  (separated by the dotted line shown in the figures). The rod-retaining section  2   a  is arranged between the two engaging sections  2   b . The elastic fastener  2  is engaged with the fixing rail  1  by the engaging sections  2   b , such that the rod-retaining section  2   a  is received in the fixing rail  1 . In addition, the extendable rod  3  can be engaged with the rod-retaining section  2   a.    
     Please refer to  FIG. 2 , the rod-retaining section  2   a  of the elastic fastener  2  can be inserted into the fixing rail  1  through the slit  11 . Alternatively, the rod-retaining section  2   a  can be inserted into the fixing rail  1  from either end of the fixing rail  1  (as described in another embodiment). 
     Please refer to  FIGS. 4 and 5 , the elastic fastener  2  includes an arched portion  21  arranged at a middle part thereof, with an opening formed at a top end of the arched portion  21 . As such, the arched portion  21  forms a receiving space “S” with the opening for receiving the extendable rod  3 . The elastic fastener  2  further includes two positioning portions  22  respectively arranged at front and rear ends of the arched portion  21  for engaging with and steadily positioning the extendable rod  3  received in the receiving space “S.” Each positioning portion  22  includes two rod-limiting pieces  221 . In this embodiment, the elastic fastener  2  has two opposite edges  2   c  respectively located at left and right sides thereof. The two rod-limiting pieces  221  are bent and respectively extend from the two edges  2   c  toward the receiving space “S.” 
     According to the arrangement described above, the arched portion  21  and the two positioning portions  22  jointly form the rod-retaining section  2   a  of the elastic fastener  2 . When placing the extendable rod  3  into the receiving space “S,” the extendable rod  3  applies a force to the two positioning portions  22 , such that the rod-retaining section  2   a  is expanded and deforms elastically. The rod-retaining section  2   a  returns to its original shape after the extendable rod  3  passes through the two positioning portions  22  and is steadily received in the receiving space “S.” Thus, the rod-retaining section  2   a  is securely engaged with an outer periphery of the extendable rod  3  by the two positioning portions  22 . Preferably, top and bottom corners of each rod-limiting piece  221  are round corners, so that the extendable rod  3  can be smoothly inserted into the receiving space “S” due to said round top corners. On the other hand, with the round bottom corners, high tension which occurred between the rod-limiting pieces  221  and the extendable rod  3  is prevented. 
     Each of the front and rear ends of the arched portion  21  connects with an exterior coupling part  23 . Each exterior coupling part  23  includes a lateral wall  231 , a first covering portion  232  and a second covering portion  233 . The lateral wall  231  is connected to the arched portion  21  and extends toward the top side of the fixing rail  1 . The first covering portion  232  is connected to the lateral wall  231  and extends toward the front side or the rear side of the fixing rail  1 , with the first covering portions  232  of the two exterior coupling parts  23  extending backwards to each other. In addition, the first covering portion  232  covers a top face of the fixing rail  1 . The second covering portion  233  is connected to the first covering portion  232  and extends downwards for covering a front face or a rear face of the fixing rail  1 . Besides, the elastic fastener  2  can further include an engaging portion  24 , a rail-coupling portion  25 , or both on each exterior coupling part  23 . The engaging portion  24  is arranged at an end of the exterior coupling part  23  connecting to the rod-retaining section  2   a , and the rail-coupling portion  25  is arranged at a distal end of the exterior coupling part  23  away from the rod-retaining section  2   a . Accordingly, the elastic fastener  2  can be securely engaged with the fixing rail  1  by the engaging portion  24  abutting against an inner face of the top side of the fixing rail  1 , or by the rail-coupling portion  25  extended through an outer surface of the fixing rail  1  into a side groove  12  of the fixing rail  1 . 
     In this embodiment, the engaging portion  24  is arranged on the lateral wall  231  of the exterior coupling part  23 . Each engaging portion  24  has two rail-abutting pieces  241  respectively connected to the two edges  2   c . The two rail-abutting pieces  241  are bent and extend away from the receiving space “S.” The rail-coupling portion  25  can be formed by a part of the second covering portion  233  of the exterior coupling part  23 , which bends toward the arched portion  21 . 
     As described above, the engaging section  2   b  of the elastic fastener  2  can be formed by the exterior coupling part  23  and the engaging portion  24 . When inserting the rod-retaining section  2   a  of the elastic fastener  2  into the fixing rail  1 , the two engaging sections  2   b  deform elastically when the two engaging portions  24  pass through the slit  11 . The two engaging sections  2   b  return to their original shape when the two engaging portions  24  are already received in the fixing rail  1 , such that the two positioning portions  24  are able to steadily abut against the inner face of the top side of the fixing rail  1 . In this way, the elastic fastener  2  is able to securely engage with the fixing rail  1 . Preferably, each rail-abutting piece  241  is tapered downwards, forming an inclined edge  2411 . Due to the arrangement of the inclined edge  2411 , the elastic fastener  2  along with the rail-abutting piece  241  can be smoothly inserted into the fixing rail  1 . 
     Otherwise, the engaging section  2   b  of the elastic fastener  2  can be formed by the exterior coupling part  23  and the rail-coupling portion  25 . When the two exterior coupling parts  23  move downwards along the front and rear faces of the fixing rail  1 , the elastic fastener  2  having the rail-coupling portions  25  is expanded and deforms elastically. When each rail-coupling portion  25  arrives the respective side groove  12 , said elastic fastener  2  returns to its original shape, with the rail-coupling portions  25  extending into the side grooves  12 . As a result, the elastic fastener  2  securely engages with the fixing rail  1 . In the case that the elastic fastener  2  has the engaging portions  24  and rail-coupling portions  25  at the same time, the engagement between the elastic fastener  2  and the fixing rail  1  is further enhanced. 
     Please refer to  FIG. 2 , which shows that the extendable rod  3  includes an outer tube  31  and at least an inner tube  32 . An end portion of the inner tube  32  is received in the outer tube  31 . An entire length of the extendable rod  3  can be varied by adjusting an overlapping length of the inner tube  32  with the outer tube  31 . Thus, the requirement of different lengths can be satisfied. According to this arrangement, two ends of the extendable rod  3  can securely abut against two opposite surfaces of a window frame, door frame, walls, pillars or cabinet, with the two opposite surfaces facing each other. In this embodiment, the extendable rod  3  includes only a single inner tube  32  that is received in the outer tube  31  and is able to move axially relative to the outer tube  32 . However, it is not taken as a limited sense. 
     Please refer to  FIGS. 2 and 4 , the extendable rod  3  is received in the rod-retaining section  2   a  of the elastic fastener  2 , and both of the two positioning portions  22  abut against the outer periphery of the extendable rod  3 . It is understood that since the outer tube  31  has an outer diameter larger than that of the inner tube  32 , the elastic fastener  2  capable of engaging with the outer tube  31  may not be suitable for the inner tube  32  to engage with. Accordingly, the size of the elastic fastener  2 , especially that of the arched portion  21 , should correspond to the size of the respective tube. Alternatively, as shown in  FIGS. 6 and 7 , a sleeve  33  can be fit around the inner tube  32  in a position where the elastic fastener  2  engages, with an outer diameter of the sleeve  33  equal to that of the outer tube  31 . Hence, all the elastic fasteners  2  can be in the same size, which can surely avoid errors due to selecting an improper-sized elastic fastener  2  and avoid the re-assembly processes resulting from the errors. Thus, convenient assembly and improved efficiency are achieved. 
     Please refer to  FIGS. 2 and 3 . When the fixing assembly for the shading body of the present invention is in use, the user can adjust the entire length of the extendable rod  3 , to abut the two ends of the extendable rod  3  against two opposite surfaces of a window frame, door frame, walls, pillars or cabinet, with the two opposite surfaces facing each other. Referring to  FIG. 4 , the user can engage an appropriate amount of elastic fasteners  2  with the fixing rail  1  by inserting the rod-retaining section  2   a  of each elastic fastener  2  into the fixing rail  1  through the slit  11 . As such, the two engaging portions  24  of the two engaging sections  2   b  are securely engaged with the inner face of the top side of the fixing rail  1 , and the two rail-coupling portions  25  extend into the aligned side grooves  12 . Thus, the elastic fastener  2  is securely engaged with the fixing rail  1 . 
     Please refer to  FIG. 3 . Next, the user can push the fixing rail  1  along with the elastic fasteners  2  upwards from a bottom side of the extendable rod  3 , to insert the extendable rod  3  into the fixing rail  1  through the slit  11 . The extendable rod  3  is therefore received in the receiving space “S.” As such, the two positioning portions  22  of the elastic fastener  2  securely engage with the outer periphery of the extendable rod  3 . In this way, the shading body “C” coupled with the fixing rail  1  can be hung in a position by the extendable rod  3 , such as a window frame, door frame, walls, pillars or a cabinet. Moreover, since the extendable rod  3  is covered by the fixing rail  1 , the appearance of the fixing assembly for the shading body is simple. 
     Please refer to  FIG. 8 , which shows a fixing assembly for the shading body according to a second embodiment of the present invention. The second embodiment of the present invention is similar to the first embodiment, and the major difference therebetween lies in the structure of an elastic fastener  4  replacing the elastic fastener  2  of the first embodiment as well as the way to insert the elastic fastener  4  into the fixing rail  1 , from a left end or a right end of the fixing rail  1 . 
     Please refer to  FIGS. 10 and 11 , the elastic fastener  4  of this embodiment includes a rod-retaining section  4   a  and two engaging sections  4   b . The rod-retaining section  4   a  is arranged between the two engaging sections  4   b . The elastic fastener  4  is engaged with the fixing rail  1  by the engaging sections  4   b , such that the rod-retaining section  4   a  is received in the fixing rail  1 . In addition, the extendable rod  3  can be engaged with the rod-retaining section  4   a.    
     Please refer to  FIGS. 9 and 11 . Specifically, the elastic fastener  4  includes an arched portion  41  arranged at a middle part thereof, with an opening formed at a top end of the arched portion  41 . As such, the arched portion  41  forms a receiving space “S” with the opening for receiving the extendable rod  3 . Each of the front and rear ends of the arched portion  41  connects with at least one elastic piece  42 . An engaging portion  421  is formed by a distal end of the elastic piece  42  that is away from the arched portion  41 . The engaging portion  421  abuts against the inner face of the top side of the fixing rail  1 . A portion of the elastic piece  42  bends toward the receiving space “S,” forming a positioning portion  422  between two ends of the elastic piece  42 . Furthermore, each of the front and rear ends of the arched portion  41  connects to at least one exterior coupling part  43 . Each exterior coupling part  43  includes a lateral wall  431 , a first covering portion  432  and a second covering portion  433 . The lateral wall  431  is connected to the arched portion  41  and extends toward the top side of the fixing rail  1 . The first covering portion  432  is connected to the lateral wall  431 . The first covering portion  432  extends toward the front side of the fixing rail  1  if connecting with the lateral wall  431  extending from the front end of the arched portion  41 . Otherwise, the first covering portion  432  extends toward the rear side of the fixing rail  1  if connecting with the lateral wall  431  extending from the rear end of the arched portion  41 . In addition, the first covering portion  432  covers the top face of the fixing rail  1 . The second covering portion  433  is connected to the first covering portion  432  and extends downwards for covering the front face or the rear face of the fixing rail  1 . In this embodiment, each of the front and rear ends of the arched portion  41  connects with a single elastic piece  42  and a single exterior coupling part  43 , and the elastic piece  42  is arranged at a center of the exterior coupling part  43 . 
     According to the above, the rod-retaining section  4   a  of the elastic fastener  4  can be formed by the arched portion  41  and the positioning portion  422  of each elastic piece  42 . In addition, the engaging section  4   b  of the elastic fastener  4  can be formed by the exterior coupling part  43  and the engaging portion  421  of the elastic piece  42 . 
     Please refer to  FIGS. 10 and 11 . When assembling the fixing assembly of the shading body of this embodiment, the user can insert the elastic fastener  4  into the fixing rail  1  from the left end or the right end thereof, with the rod-retaining section  4   a  of the elastic fastener  4  received in the fixing rail  1 . Each engaging section  4   b  of the elastic fastener  4  covers the top face of the fixing rail  1  by the first covering portion  432 , and covers the front face or the rear face of the fixing rail  1  by the second covering portion  433  extended downwards. Meanwhile, the engaging portions  421  of the two elastic pieces  42  abut with the inner face of the top side of the fixing rail  1 . As such, the elastic fastener  4  can be securely engaged with the fixing rail  1  by the two elastic pieces  42  and the respective exterior coupling parts  43 . 
     Moreover, when the fixing rail  1  along with the elastic fasteners  4  are pushed upwards from the bottom side of the extendable rod  3 , the extendable rod  3  is able to be inserted into the fixing rail  1  through the slit  11 . During this process, the extendable rod  3  applies a force to the positioning portions  422  of the two elastic pieces  42 , such that the two elastic pieces  42  are expanded and deform elastically. The two elastic pieces  42  return to their original shape after the extendable rod  3  is received in the receiving space “S,” such that the positioning portions  422  of the two elastic pieces  42  can be steadily abutted against the outer periphery of the extendable rod  3 . 
     Please refer to  FIG. 12 , which shows a fixing assembly for shading body according to a third embodiment of the present invention. The third embodiment of the present invention is similar to the second embodiment, and the major difference therebetween lies in the structure of an elastic fastener  5  replacing the elastic fastener  4  of the second embodiment as well as that the elastic fastener  5  is completely received in the fixing rail  1 . In this arrangement, the elastic fastener  5  is not presented on the appearance of the fixing assembly for the shading body when it is assembled, such that the appearance of the fixing assembly for the shading body is simple. 
     Please refer to  FIGS. 14 and 15 , the elastic fastener  5  of this embodiment includes a rod-retaining section  5   a  and two engaging sections  5   b , with the rod-retaining section  5   a  arranged between the two engaging sections  5   b . The elastic fastener  5  is received in the fixing rail  1  and engages with the fixing rail  1  by the two engaging sections  5   b . In addition, the elastic fastener  5  engages with the extendable rod  3  by the rod-retaining section  5   a.    
     Please refer to  FIGS. 13 and 15 . Specifically, the elastic fastener  5  includes an arched portion  51  arranged at a middle part thereof, with an opening formed at a top end of the arched portion  51 . As such, the arched portion  51  forms a receiving space “S” with the opening for receiving the extendable rod  3 . Each of the front and rear ends of the arched portion  51  connects to at least one elastic piece  52 . An engaging portion  521  is formed by a distal end of the elastic piece  52  that is away from the arched portion  51 . The engaging portion  521  abuts against the inner face of the top side of the fixing rail  1 . A portion of the elastic piece  52  bends toward the receiving space “S,” forming a positioning portion  522  between two ends of the elastic piece  52 . Furthermore, each of the front and rear ends of the arched portion  51  connects to at least a side-abutting piece  53 . The side-abutting piece  53  extends toward the front side of the fixing rail  1  if connecting with the front end of the arched portion  51 , forming an abutting portion  531 . Otherwise, the side-abutting piece  53  extends toward the rear side of the fixing rail  1  if connecting with the rear end of the arched portion  51 , forming the abutting portion  531 . The abutting portion  531  abuts against an inner surface of the bottom side of the fixing rail  1 . In a top-to-bottom direction, the arched portion  51  is located between the engaging portion  521  and the abutting portion  531 , so that the arched portion  51  is spaced from the inner surface of the bottom side of the fixing rail  1 . In this embodiment, each of the front and rear ends of the arched portion  51  connects with two elastic pieces  52 , and the two elastic pieces  52  at either one of said ends of the arched portion  51  are respectively located adjacent to left and right edges of the elastic fastener  5 , such that the side-abutting piece  53  is located between the two elastic pieces  52 . 
     According to the arrangement described above, the rod-retaining section  5   a  of the elastic fastener  5  can be formed by the arched portion  51  and the positioning portion  522  of each elastic piece  52 . In addition, the engaging section  5   b  of the elastic fastener  5  can be formed by the side-abutting piece  53  and the engaging portions  521  of the elastic pieces  52 . 
     Please refer to  FIGS. 14 and 15 . When assembling the fixing assembly of the shading body of this embodiment, the user can insert the elastic fastener  5  into the fixing rail  1  from the left end or the right end thereof, such that the receiving space “S” and the strip  11  of the fixing rail  1  are aligned and intercommunicate with each other. The elastic fastener  5  abuts against the inner surface of the top side of the fixing rail  1  by the engaging portion  521  of each elastic piece  52 , and abuts against the inner surface of the bottom side of the fixing rail  1  by the abutting portion  531  of each side-abutting piece  53 . As such, the elastic fastener  5  securely engages with the fixing rail  1  and is located at a predetermined position in the fixing rail  1 . 
     Moreover, when the fixing rail  1  along with the elastic fasteners  5  is pushed upwards from the bottom side of the extendable rod  3 , the extendable rod  3  is able to be inserted into the fixing rail  1  through the slit  11 . During this process, the extendable rod  3  applies a force to the positioning portion  522  of each elastic piece  52 , such that each elastic piece  52  is expanded and deforms elastically. The elastic pieces  52  return to their original shape when the extendable rod  3  is already received in the receiving space “S,” such that the positioning portions  522  of the elastic piece  52  can jointly abut against the outer periphery of the extendable rod  3 , thus steadily positioning the extendable rod  3 . 
     Please refer to  FIG. 16 , which shows a fixing assembly for a shading body according to a fourth embodiment of the present invention. The fourth embodiment of the present invention is similar to the third embodiment, and the major difference therebetween lies in the structure of an elastic fastener  6  replacing the elastic fastener  5  of the third embodiment. 
     Please refer to  FIGS. 17 and 19 , the elastic fastener  6  of this embodiment includes a rod-retaining section  6   a  and two engaging sections  6   b . The rod-retaining section  6   a  is arranged between the two engaging sections  6   b . The elastic fastener  6  is received in the fixing rail  1  and engages with the fixing rail  1  by the two engaging sections  6   b . In addition, the elastic fastener  6  engages with the extendable rod  3  by the rod-retaining section  6   a.    
     Please refer to  FIGS. 17 and 19 . Specifically, the rod-retaining section  6   a  of the elastic fastener  6  includes an arched portion  61 , with an opening formed at a top end of the arched portion  61 . The arched portion  61  forms two positioning portions  611  respectively at two edges thereof adjacent to the opening, and a receiving space “S” with the opening for receiving the extendable rod  3 . 
     Each engaging section  6   b  includes a first abutting part  62 , a second abutting part  63  and a third abutting part  64 . The first abutting part  62  connects to the arched portion  61  and extends toward the front side or the rear side of the fixing rail  1 , with the first abutting parts  62  of the two engaging sections  6   b  extending backwards to each other. The second abutting part  63  connects to the first abutting part  62  and extends toward the top side of the fixing rail  1 , such that a distal end of the second abutting part  63  away from the first abutting part  62  abuts against the inner surface of the top side of the fixing rail  1 . The third abutting part  64  connects to the positioning portion  611 , and is bent and extends toward the top side of the fixing rail  1 . An engaging portion  641  is formed by a distal end of the third abutting part  64  away from the positioning portion  611 , and abuts against the inner surface of the top side of the fixing rail  1 . The first abutting parts  62  of the two engaging sections  6   b  can extend from a bottom end of the arched portion  61 , with the first abutting parts  62  of the two engaging sections  6   b  connecting to each other. As such, the structural strength of the elastic fastener  6  is enhanced. 
     Furthermore, each engaging section  6   b  can further include a supporting piece  65  arranged between the first abutting part  62  and the third abutting part  64 , and the supporting piece  65  is adjacent to the first abutting part  62 . Two ends of the supporting piece  65  connect to the arched portion  61  and the second abutting part  63 , respectively. As such, the two supporting pieces  65  are able to further enhance the structural strength of the elastic fastener  6  without affecting the elasticity of the positioning portion  611  of the arched portion  61 . 
     According to the above, the rod-retaining section  6   a  of the elastic fastener  6  can be formed by the arched portion  61 , and the engaging section  6   b  of the elastic fastener  6  can be formed by the first abutting part  62 , the second abutting part  63  and the third abutting part  64 . 
     Please refer to  FIGS. 18 and 19 . When assembling the fixing assembly for the shading body of this embodiment, the user can insert the elastic fastener  6  into the fixing rail  1  from the left end or the right end thereof, such that the receiving space “S” and the strip  11  of the fixing rail  1  are aligned and intercommunicate with each other. The elastic fastener  6  abuts against the inner surface of the bottom side of the fixing rail  1  by the first abutting part  62 , and the distal end of the second abutting part  63  extends upwards to abut against the inner surface of the top side of the fixing rail  1 . Meanwhile, the engaging portion  641  of the third abutting part  64  also abuts against the inner surface of the top side of the fixing rail  1 , such that the elastic fastener  6  securely engages with the fixing rail  1  and is located at a predetermined position in the fixing rail  1 . 
     Moreover, when the fixing rail  1  along with the elastic fasteners  6  are pushed upwards from the bottom side of the extendable rod  3 , the extendable rod  3  is able to be inserted into the fixing rail  1  through the slit  11 . During this process, the extendable rod  3  applies a force to the two positioning portions  611  of the arched portion  61 , such that a portion of the third abutting part  64  connected to the arched portion  61  is expanded and deforms elastically. The portion of the third abutting part  64  returns to its original shape after the extendable rod  3  passes through the two positioning portions  611 , such that the two positioning portions  611  of the arched portion  61  are able to steadily abut against the outer periphery of the extendable rod  3 . 
     As a conclusion, the fixing assembly for the shading body of the present invention can be assembled with all types of curtains, shades and blinds, and can be installed between two opposite surfaces facing each other of a building by the extendable rod. The installation manner is convenient, and will not leave screw holes on walls once the curtain, blind, or shade is removed. Therefore, such a fixing assembly for a shading body is suitable for a tenant. 
     Although the invention has been described in detail with reference to its presently preferable embodiments, it will be understood by one of ordinary skill in the art that various modifications can be made without departing from the spirit and the scope of the invention, as set forth in the appended claims.