Abstract:
A storage apparatus for a seat of a vehicle, in which the seat is stored in a storage space formed therebelow, so that it is possible to secure a wider luggage space as compare with the related art and reduce unit cost without using a separate slide rail. In addition, the storage apparatus variously uses the space of a back seat when shifted between a passenger space (seating mode) and a luggage space (luggage mode) of the multi-functional back seat, which is vertically movable and foldable.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims under 35 U.S.C. §119(a) the benefit of priority to Korean Patent Application No. 10-2013-0021589 filed Feb. 27, 2013, the entire contents of which are incorporated herein by reference. 
       TECHNICAL FIELD 
       [0002]    The present disclosure relates to a storage apparatus for a seat of a vehicle which secures both a luggage space and a boarding space simultaneously. 
       BACKGROUND 
       [0003]    A demand for more space in a vehicle for passenger seats and lodging has been increasing. For example, increasing leisure activities for people to spend more time driving has increased a demand for more boarding space or for luggage space in a vehicle. Accordingly, there has been an increasing demand for a multi-purpose vehicle (MPV: 6 to 11 passenger vehicle), which can carry more equipment for various kinds of activities. 
         [0004]    Particularly, an 11 or more passenger vehicle having an arrangement of four-row seats or more has several seat functions in order to obtain more luggage space. 
         [0005]    In order to obtain as much as possible of luggage space in the vehicle, there have been proposed several types of accommodation portions on a floor, thereby accommodating a seat in the accommodation portion. 
         [0006]    U.S. Pat. No. 6,997,498 discloses a seat apparatus for a vehicle, which inserts a seat into a concavely formed accommodation portion, using an X-type link or damper. 
         [0007]    U.S. Pat. No. 7,328,930 discloses a seat for a vehicle, which is mounted to be foldable on a floor by two links. 
         [0008]    As a representative type of MPVs, a seat structure has been disclosed in which an accommodation portion  1  can be separated from the seating position  3  of a seat  2  as shown in  FIG. 1 . 
         [0009]    There has also been disclosed a seat structure in which, as shown in  FIG. 2 , a fourth row seat  6  can be moved to a third row seat as close as possible, using a slide rail mounted on a floor, by rotating and tipping up a front end portion of a seat cushion  5  in the direction of the seat back  6 . 
         [0010]    As described above, a vehicle having an arrangement of three or four-row seats implements various seat functions in order to achieve more space. However, a vehicle having an arrangement of four-row seats further has one more row of seats than that of three-row seats. Therefore, there are some difficulties in achieving sufficient space. 
       SUMMARY 
       [0011]    The present disclosure provides a storage apparatus for a seat of a vehicle, in which the seat is stored in a storage space defined therebelow. Therefore, it is possible to achieve more space as compared to the related art, reduce unit cost by eliminating a separate slide rail, and use the back seat space by shifting between a passenger space (seating mode) and a luggage space (luggage mode) of the multi-functional back seat which is vertically movable and foldable. 
         [0012]    In an aspect of the present disclosure, a storage apparatus for a seat of a vehicle includes a plurality of links supporting the seat including a seat back and a seat cushion, and mounted on the floor in a hinge structure so as to be foldable and adjustable. An elastic member returns the seat to an original position thereof by adjusting the storage state of the seat, wherein the seat is stored inside a storage space recessed into the floor in a luggage mode or returned to the original position in a seating mode. 
         [0013]    In an exemplary embodiment, the links may include a front upper link and a front lower link, mounted to a front of the seat cushion in the hinge structure so as to be foldable and adjustable. A rear link is rotatably mounted to a rear of the seat cushion, and a main link is rotatably mounted between the front upper link and the seat back in the hinge structure. A guide link is connected between the main link and the rear link in the hinge structure. 
         [0014]    In another exemplary embodiment, the main link may guide the front upper and front lower links to be folded inside the storage space when the seat back is folded and the seat cushion is lowered. 
         [0015]    In still another exemplary embodiment, the guide link may maintain the interval between the main link and the rear link by simultaneously rotating together with the main link and the rear link when the seat back is folded and the seat cushion is lowered. Further, the guide link may evenly transfer the weight of the seat to the main link and rear link. 
         [0016]    In yet another exemplary embodiment, the front upper link, the front lower link, the main link, the rear link and the guide link may move together, and each link may constantly move in one direction. 
         [0017]    In still yet another exemplary embodiment, the storage apparatus may include a recliner mounted to the seat back and maintain an adjusted or folded state of the seat back by locking the seat back. A striker is fixed to a bottom of the storage space. A cushion locking latch is mounted to a seat cushion frame in the hinge structure and maintains the storage state of the seat in such a manner that the cushion locking latch is latched to the striker. 
         [0018]    In a further exemplary embodiment, the storage apparatus may include an operation strap manually releasing a locking state of the seat back, and a recliner releasing lever to release the locking of the recliner. A back recliner release lever assembly is mounted to the seat back and is connected to the recliner release lever through a back recliner release cable, so as to release the locking of the recliner. A cushion locking release lever assembly is mounted to the seat cushion and is connected to the cushion locking latch through a cushion locking release cable, so as to release the locking of the cushion locking latch. A connection cable connects the back recliner release lever assembly, and the cushion locking release lever assembly, thereby simultaneously releasing the locking of the recliner and the locking of the cushion locking latch when the operation strap is operated. 
         [0019]    The back recliner release lever assembly may include a seat back rotation lever having one end portion mounted to the seat back and the other end portion rotated by being linked with the operation strap. A fixing projection disposed around one end portion of the seat back rotation lever is connected to the back recliner release cable and the connection cable, so as to simultaneously operate the back recliner release cable and the connection cable when rotating in one direction. 
         [0020]    The cushion locking release assembly may include a seat cushion rotation lever rotatably mounted to the seat cushion in the hinge structure. A fixing projection disposed at an edge of the seat cushion rotation lever is connected to the cushion locking release cable and the connection cable, so as to simultaneously operate the cushion locking release cable and the connection cable when rotating in one direction. The seat back rotation lever and the seat cushion rotation lever are linked with each other through the connection cable. 
         [0021]    The elastic means may include a torsion spring mounted between the links, so as to return the seat to the original state by adjusting the links in the folding state by means of an elastic recovery force thereof. A spiral spring is mounted at a lower end of the seat back, so as to return the seat to the original state by adjusting the seat back in the folding state by means of an elastic recovery force thereof. 
         [0022]    The storage apparatus may include a rear mounting bracket mounted to the rear link in the hinge structure, having guide pins respectively deposed at both side lower ends thereof. Seat attaches are mounted at the rear of the storage space while being spaced apart in the width direction of the vehicle, and guide groove portions are respectively disposed at both side lower ends thereof. The rear mounting bracket is first assembled to the seat attaches by latching the guide pins to guide groove portions when the seat is assembled, thereby facilitating the assembling of the seat. 
         [0023]    The seat may include a mounting bracket fixing frame fixed and attached to an upper-end portion of the rear mounting bracket using an irregularity structure. The mounting bracket fixing frame may prevent the rear mounting bracket from rotating about the rear link, thereby preventing the degradation of workability caused by vehicle body interference when assembling the seat. 
         [0024]    The upper-end portion of the rear mounting bracket and an irregularity portion of the mounting bracket fixing frame may be vertically bolted to each other, so that a mounting aperture is easily recognized. 
         [0025]    Advantages of the storage apparatus for the seat of the vehicle are described as follows. 
         [0026]    1. Modification of link structure 
         [0027]    1) The guide link connects the main link and the rear link to prevent stress concentration caused by coupling between the existing guide link and the back side bracket, thereby improving the hardness of the back side bracket. 
         [0028]    2) One of the existing two side covers is removed by modifying the link structure, thereby preventing the external appearance of the link from being exposed with one side cover and obtaining an aesthetic appearance benefit of the link. 
         [0029]    2. Improvement of assembling method of rear mounting 
         [0030]    1) The seat attaches are manufactured separately from the seat and fixed at three places of the rear of the storage space. The seat attaches are spaced apart from one another in a width direction of the vehicle before the rear link of the seat is assembled to the storage space, thereby improving assembling performance and workability. 
         [0031]    Further, upper and lower sides of an attach main body are bolted together based on the ninth hinge of the rear link. Therefore, it is possible to prevent stress concentration caused by a vertical rotation moment when the rear link rotates in the vertical direction, thereby enhancing the hardness of the seat attach. 
         [0032]    2) The mounting bracket fixing frame prevents the rear mounting bracket from rotating in the front-back direction about the ninth hinge of the rear link, thereby improving the assembling performance of the seat. 
         [0033]    3) The guide pin of the rear mounting bracket is assembled to the U-shaped guide groove portion disposed at both sides of the seat attach. The rear mounting bracket is fastened to the seat attach, thereby facilitating the assembling between the rear mounting bracket and the seat attach. 
         [0034]    4) The protruding plate used in the seat attach prevents the seat from drooping downward when the seat is assembled and prevents the seat from rotating backward, thereby improving assembling performance. 
         [0035]    5) The rear mounting bracket is fastened with a vertical bolt to easily recognize a mounting aperture. 
         [0036]    3. The cushion locking latches are respectively used on both sides of the seat cushion frame to prevent the locking of the seat from being released from the floor, which may be caused by irregular driving, vehicle collision, etc., thereby preventing an accident. 
         [0037]    4. The locking between the back recliner and the cushion locking latch are simultaneously released using the operation straps and connection cables, thereby decreasing the number of various cables and components. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0038]    The above and other features of the present disclosure will now be described in detail with reference to certain exemplary embodiments thereof illustrated the accompanying drawings which are given hereinbelow by way of illustration only, and thus are not limitative of the present disclosure. 
           [0039]      FIG. 1  is a view showing an example of a seat storage apparatus according to a related art. 
           [0040]      FIG. 2  is a side view showing a structure in which seats are closely adhered using a slide rail according to a related art. 
           [0041]      FIG. 3  is a side view of a storage apparatus for a seat in a seating mode according to an embodiment of the present disclosure. 
           [0042]      FIG. 4  is a side view of the storage apparatus for the seat in a luggage mode according to the embodiment of the present disclosure. 
           [0043]      FIG. 5  is a side view showing a shifting state from the luggage mode to the seating mode according to the present disclosure. 
           [0044]      FIG. 6  is a bottom perspective view of the seat in the luggage mode according to the present disclosure. 
           [0045]      FIGS. 7A and 7B  are enlarged views of portion A of  FIG. 6 , which are perspective views showing a configuration and operating state of a cushion locking latch. 
           [0046]      FIG. 8  is an enlarged view of portion B of  FIG. 6 , which is a perspective view showing an operating state of a recliner release lever. 
           [0047]      FIG. 9  is a perspective view of the seat in the seating mode according to the present disclosure. 
           [0048]      FIG. 10  is a front view of  FIG. 9 . 
           [0049]      FIG. 11  is a view showing an operating state of a back recliner release lever assembly according to the present disclosure. 
           [0050]      FIG. 12  is a view showing an operating state of a cushion locking release lever assembly according to the present disclosure. 
           [0051]      FIG. 13  is a view showing a shifting state from the seating mode to the luggage mode according to the present disclosure. 
           [0052]      FIGS. 14 and 14A  to  14 E are views showing an operating state of links in the shift from the seating mode to the luggage mode according to the present disclosure. 
           [0053]      FIG. 15  is a view showing a shifting state from the luggage mode to the seating mode according to the present disclosure. 
           [0054]      FIG. 16  is a view showing the effect that the hardness of a back side bracket is enhanced according to the modified structure of a guide link according to the present disclosure. 
           [0055]      FIG. 17  is a view showing a state in which an exposed external appearance of the guide link is removed when the structure of the guide link is modified according to the present disclosure. 
           [0056]      FIG. 18  is a perspective view shown a state in which seat attaches are mounted according to the present disclosure. 
           [0057]      FIG. 19  is a view showing the effect that the stress concentration of the seat attaches is prevented according to the present disclosure. 
           [0058]      FIG. 20  is a view showing a state in which a rear link and a rear mounting are assembled according to the present disclosure. 
           [0059]      FIG. 21  is a perspective view showing a state in which the rear link is assembled according to the present disclosure. 
           [0060]      FIG. 22  is a view showing a state in which the rotation of the seat is prevented when the seat is assembled according to the present disclosure. 
           [0061]      FIG. 23  is a perspective view showing a state in which a rear mounting aperture is used in a vertical assembling method according to the present disclosure. 
       
    
    
       [0062]    It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various preferred features illustrative of the basic principles of the disclosure. The specific design features of the present disclosure as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. 
         [0063]    In the figures, reference numbers refer to the same or equivalent parts of the present disclosure throughout the several figures of the drawing. 
       DETAILED DESCRIPTION 
       [0064]    Hereinafter reference will now be made in detail to various embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings and described below. While the disclosure will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the disclosure to those exemplary embodiments. On the contrary, the disclosure is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the disclosure as defined by the appended claims. 
         [0065]      FIG. 3  is a side view of a storage apparatus for a seat  10  in a seating mode according to an embodiment of the present disclosure.  FIG. 4  is a side view of the storage apparatus for the seat  10  in a luggage mode according to the embodiment of the present disclosure. 
         [0066]    According to the present disclosure, a storage apparatus for a seat of a vehicle enables the space of a back seat  10  in a multi-purpose vehicle (MPV) to be widely used as a luggage storage space by freely shifting the seat  10  to be in a seating mode or luggage mode as a passenger desires. 
         [0067]    In the storage apparatus according to the present disclosure, the space of the back seat  10  in the MPV is used as a luggage storage space. Particularly, the storage apparatus can be applied to a four-row seat in an 11 passenger vehicle, and the like. 
         [0068]    The seating mode refers to a mode in which a seat back  11  and a seat cushion  12  are adjusted so that passengers can sit on the back seat  10 . The luggage mode refers to a mode in which the seat back  11  and the seat cushion  12  are folded and stored in a storage space  13  provided in the floor. 
         [0069]    The storage apparatus according to the present disclosure freely shifts the seat  10  between the seating mode and the luggage mode with a plurality of links  14  on the bottom surface of the seat  10 . 
         [0070]    The seat  10  includes the seat cushion  12  and the seat back  11 . The seat back  11  is foldable or adjustable by rotating in the front-back direction from the seat cushion  12  by a back hinge  15 . 
         [0071]    The back hinge  15  is disposed at a portion where the lower-end portion of the seat back  11  is connected to the rear-end portion of the seat cushion  12 . A recliner  16  as a locking means is mounted inside the back hinge  15  to maintain the seat back  11  in a folded state or adjusted state. 
         [0072]    The link  14  is connected in a hinge structure between the seat  10  and the bottom surface (or rear surface) of the storage space  13 , so as to freely shift the seat  10  between the luggage mode and the seating mode and to support the seat  10 . 
         [0073]    The links  14  include front upper link  17  and front lower link  18  supporting the front of the seat cushion  12 . A rear link  21  supports the rear of the seat cushion  12 . A main link  19  is connected between the front upper link  17  and the seat back  11 , and a guide link  20  is connected between the main link  19  and the rear link  21 . 
         [0074]    Connection portions between the links  14  are connected by hinges. A first hinge  22  is disposed at a portion where the upper-end portion of the front upper link  17  is connected to the front-end portion of the seat cushion  12 . A second hinge  23  is disposed at a portion where a lower portion of the front upper link  17  is connected to the front end portion of the main link  19 . A third hinge  24  is disposed at a portion where the lower-end portion of the front upper link  17  is connected to the upper-end portion of the front lower link  18 , and a fourth hinge  25  is disposed at a connection portion between the lower-end portion of the front lower link  18  and a bottom front of the storage space  13 . A fifth hinge  26  is disposed at a portion where a middle portion of the main link  19  is connected to the front-end portion of the guide link  20 . A sixth hinge  27  is disposed at a portion where the rear-end portion of the guide link  20  is connected to the rear-end portion of the rear link  21 , and a seventh hinge  28  is disposed at a portion where the rear-end portion of the main link  19  is connected to a lower-end side bracket of the seat back  11 . An eighth hinge  29  is positioned at a portion where the rear-end portion of the seat cushion  12  is connected to the upper-end portion of the rear link  21  (in the seating mode), and a ninth hinge  30  is disposed at a connection portion between the lower-end portion of the rear link  21  and a rear upper-end portion of the storage space  13 . 
         [0075]    The links  14  operated systematically at the same time when shifting between the seating mode and luggage mode of the seat  10 . 
         [0076]    Referring to  FIG. 4 , when the seat back  11  is folded forward in the luggage mode, the main link  19  connected to a lower end (a back side lower bracket  31 ) of the seat back  11  is pulled backward and downward. The front upper link  17  and the guide link  20 , respectively connected to the front and rear sides of the main link  19  rotate downward in the storage space  13 . Simultaneously, the front lower link  18  connected to the lower end of the front upper link  17  rotates downward in the storage space  13 . The lower-end portion of the seat cushion  12  and the rear link  21  connected to the rear end of the guide link  20  rotate downward inside of the storage space  13 , so that the seat back  11  and the seat cushion  12  are folded and inserted inside of the storage space  13 . 
         [0077]    The links  14  are operate in the reverse in the seating mode, so that the seat back  11  is adjusted while the seat back  11  and the seat cushion  12  are ascending. 
         [0078]      FIG. 5  is a side view showing a shifting state from the luggage mode to the seating mode according to the present disclosure. The present disclosure provides an elastic means such as a spring, which is a power source for shifting from luggage mode to seating mode. 
         [0079]    A torsion spring  32  is mounted to the third hinge  24  through which the front upper and lower links  17  and  18  are connected to each other, and a spiral spring  33  is mounted to the back hinge  15  of the seat back  11 . 
         [0080]    The torsion spring  32  is coil wound in a spiral direction while maintaining the same diameter in the axis direction thereof. Both end portions of the coil are respectively fixed to the front upper and lower links  17  and  18  to adjust the front upper and lower links  17  and  18  that are folded by the elastic recovery force of the torsion spring  32  when shifting from the luggage mode to the seating mode. 
         [0081]    The spiral spring  33  is coil wound in a spiral direction while the diameter is gradually increased in the same plane. Both end portions of the coil are respectively fixed to the back hinge  15  and a seat cushion frame  35  to adjust the folded seat back  11  by the elastic recovery force of the spiral spring  33  when shifting from the luggage mode to the seating mode. 
         [0082]      FIG. 6  is a bottom perspective view of the seat  10  in the luggage mode according to the present disclosure.  FIGS. 7A and 7B  are enlarged views of portion A of  FIG. 6 , which are perspective views showing a configuration and operating state of a cushion locking latch  36 .  FIG. 8  is an enlarged view of portion B of  FIG. 6 , which is a perspective view showing an operating state of a recliner release lever  45 . 
         [0083]    In the present disclosure, a locking means maintains the seat  10  in the luggage mode to prevent the locking of the seat  10  from being released from the floor due to irregular driving, vehicle collision, etc. The locking means may comprise a cushion locking means for locking the seat cushion  12  and a back locking means for locking the seat back  11 . 
         [0084]    The cushion locking means includes a cushion locking latch  36  mounted to the seat cushion frame  35  and a striker  38  fixed to a front mounting frame  37 . The front mounting frame  37  is fixed to the bottom surface of the storage space  13 , and the striker  38  is formed in a ‘U’ shape. The striker  38  protrudes inner side direction of the storage space  13  from a side surface of the front mounting frame  37 . 
         [0085]    The cushion locking latch  36  has a planar structure, and the upper-end portion of the latch  36  is coupled to the seat cushion frame  35  in the hinge structure. Thus, the cushion locking latch  36  can rotate in the front-back direction from the seat cushion frame  35  while lowering downward together with the seat cushion frame  35 . 
         [0086]    The latch  36  has a latching groove  39  on the front side of the flate plate latch  36 . Thus, the latch  36  can be latched to the striker  38  through the latching groove  39 . 
         [0087]    The front portion of the latch  36  is elastically supported by a return spring  40  fixed to the seat cushion frame  35 . The return spring  40  returns the latch  36  to the original position of the latch  36  when the interference between the latch  36  and the striker  38  is released after the lower-end portion of the latch  36  is rotated. 
         [0088]    The lower-end portion of the latch  36  has a circular shape. Thus, when the seat cushion frame  35  is lowered in the luggage mode, the latch  36  is interfered with the rear-end portion of the striker  38  while moving downward so that the lower-end portion of the latch  36  is rotated backward. 
         [0089]    The operating state of the latch  36  will be described. When the seat cushion frame  35  is lowered and stored inside the storage space  13  in the case of shifting from the seating mode to the luggage mode, the lower-end portion of the latch  36  rotates backward due to the interference between the lower-end portion of the latch  36  and the rear-end portion of the striker  38 . 
         [0090]    If the interference between the striker  38  and the latch  36  is released by the rotation of the latch  36 , the latch  36  further lowered and simultaneously returns to the original position by the elastic recovery force of the return spring  40 . The rear-end portion of the striker  38  is latched to the latching groove  39  of the latch  36 , so that the latch  36  and the striker  38  are locked, thereby maintaining the folding state of the front lower link  18  and the storage state of the seat cushion  12 . 
         [0091]    The cushion locking means is applied to both sides of the seat cushion  12 , so that it is possible to prevent the locking of the seat cushion  12  from being released at one side when the cushion locking means is applied to only one side of the seat cushion  12 . 
         [0092]    The back locking means locks the recliner  16  mounted to the back hinge  15 , and thus, the folding state of the seat back  11  can be locked by the recliner  16 . 
         [0093]      FIG. 9  is a perspective view of the seat  10  in the seating mode according to the present disclosure.  FIG. 10  is a front view of  FIG. 9 .  FIG. 11  is a view showing an operating state of a back recliner release lever assembly  46  according to the present disclosure.  FIG. 12  is a view showing an operating state of a cushion locking release lever assembly  47  according to the present disclosure. 
         [0094]    The present disclosure provides a locking release means for releasing the cushion locking means and the back locking means. 
         [0095]    The locking release means includes an operation strap  41  mounted to the seat back  11  so as to be vertically movable, various kinds of cables for releasing the back locking means and the cushion locking means, and a release lever assembly for simultaneously operating the various kinds of cables. 
         [0096]    The operation strap  41  has a shape obtained by turning over a ‘U’ formed vertically long. The operation strap  41  is disposed outside of the seat back  11  so as to be vertically movable. Thus, a passenger can manually manipulate the operation strap  41 . 
         [0097]    The various kinds of cables include: back recliner release right and left cables  42  for releasing the back locking means, cushion locking release right and left cables  43  for releasing the cushion locking means, and connection cables  44  for simultaneously operating the back locking means and the cushion locking means by connecting the back locking means and the cushion locking means to each other. 
         [0098]    The back recliner release right and left cables  42  are respectively connected to recliner release levers  45  mounted to the left and right sides of the seat back  11  so that the recliner  16  is released. 
         [0099]    That is, one end portion of the recliner release lever  45  is hinge-coupled to the back hinge  15 , and the other end portion of the recliner release lever  45  is connected to the back recliner release cable  42 . Thus, if the recliner release lever  45  is rotated upward by the back recliner release cable  42 , the recliner  16  can be released. 
         [0100]    The cushion locking release right and left cable  43  are connected to rear portions of the cushion locking latch  36  that is mounted at the left and right sides of the seat cushion frame  35 . Therefore, locking between the striker  38  and the latch  36  can be released as the latch  36  is pulled backward. 
         [0101]    The release lever assembly includes a back recliner release lever assembly  46  connected to the back recliner release cable  42 , and a cushion locking release lever assembly  47  connected to the cushion locking release cable  43 . 
         [0102]    The back recliner release lever assembly  46  includes a seat back bracket  48  mounted to the seat back frame  34  and a seat back rotation lever  49  rotatably mounted to the seat back bracket  48  in the hinge structure. 
         [0103]    The seat back bracket  48  has projections protruding in three directions while being spaced apart from one another in the circumferential direction, and the end portion of a protection cover of the back recliner release cable  42  is fixed by the projection. Thus, the seat back bracket  48  extracts and inserts the end portion of the back recliner release cable  42  in the straight line direction from each projection. 
         [0104]    One end portion of the seat back rotation lever  49  is rotatably coupled to the central portion of the seat back bracket  48  in the hinge structure. The other end portion of the seat back rotation lever  49  is connected to the lower-end portion of the operation strap  41  to rotate the seat back rotation lever  49  in the vertical direction. 
         [0105]    Three J-shaped fixing projections  50  protrude around the one end portion of the seat back rotation lever  49  while being spaced apart from one another. The end portions of the back recliner release right and left cables  42  and the end portions of the connection cables  44  are fixed one to one. Each cable is rotated and extracted in the same direction to release locking of the back recliner. 
         [0106]    The return spring  40  such as the torsion spring  32  is mounted to a rotation hinge mounted at the central portion of the seat back bracket  48 . Both end portions of the torsion spring  32  are respectively fixed to the seat back bracket  48  and the seat back rotation lever  49 . Thus, when the rotational force of the seat back rotation lever  49  is released, the seat back rotation lever  49  returns to the original position by the elastic recovery force of the return spring  40 . 
         [0107]    The cushion locking release lever assembly  47  includes a seat cushion bracket  52  mounted to the seat cushion frame  35  and a seat cushion rotation lever  53  rotatably mounted to the seat cushion bracket  52  in the hinge structure. 
         [0108]    The seat cushion bracket  52  has projections protruding in three directions while being spaced apart from one another in the circumferential direction, and the end portion of a protection cover of the cushion locking release cable  43  is fixed by the projection. Thus, the seat cushion bracket  48  can extract and insert the end portion of the back recliner release cable  42  in the straight line direction from each projection. 
         [0109]    The central portion of the seat cushion rotation lever  53  is rotatably coupled to the central portion of the seat cushion bracket  52  in the hinge structure. J-shaped fixing projections  50  are disposed at upper and lower edge portions of the seat cushion rotation lever  53 . 
         [0110]    The cushion locking release right and left cables  43  are respectively connected to the fixing projections disposed at the upper and lower edge portions of the seat cushion rotation lever  53 , and the connection cable  44  is coupled to the cable fixing projection  55  disposed at the lower edge portion of the seat cushion rotation lever  53 . Thus, when the seat cushion rotation lever  53  rotates in one direction by the connection cable  44 , the cushion locking release right and left cables  43  and the connection cable  44  can be rotated and extracted in the same direction, thereby releasing the cushion locking means. 
         [0111]    The return spring  40  such as the torsion spring  32  is mounted to a rotation hinge mounted at the central portion of the seat cushion bracket  52 , and both end portions of the torsion spring  32  are respectively fixed to the seat cushion bracket  52  and the seat cushion rotation lever  53 . Thus, if the rotary force of the seat cushion rotation lever  53  is released, the seat cushion rotation lever  53  can return to the original position by the elastic recovery force of the return spring  40 . 
         [0112]    The connection cable  44  simultaneously operates the seat back rotation lever  49  and the seat cushion rotation lever  53  by connecting the seat back rotation lever  49  and the seat cushion rotation lever  53 . 
         [0113]    Hereinafter, an operating state of the storage apparatus for each mode according to the present disclosure will be described in detail. 
         [0114]      FIG. 13  is a view showing a shifting state from the seating mode to the luggage mode according to the present disclosure. 
         [0115]    1. Luggage Mode 
         [0116]    The locking state of the recliner  16  is released by upwardly moving the operation strap  41  mounted to the seat back  11 . 
         [0117]    When the operation strap  41  moves upward, the fixing projection  50  disposed at the right end portion of the seat back rotation lever  49  rotates as the seat back rotation lever  49  connected to the lower-end portion of the operation strap  41  rotates. 
         [0118]    The one end portions of the back recliner release right and left cables  42  respectively connected to the rotated fixing projections  50  are extracted, and the other end portions of the extracted back recliner release right and left cables  42  are pulled. Thus, the locking state of the recliner  16  is released by rotating the recliner release lever  45 . 
         [0119]    Subsequently, as the locking state of the recliner  16  is released, the seat  10  can be stored in the storage space  13  by folding the seat back  11  forward until the seat back  11  becomes horizontally leveled to the seat cushion  12 . 
         [0120]    The operating state of the links  14  where the seat back  11  and the seat cushion  12  are completely inserted into the storage space  13  will be described in detail hereinbelow. 
         [0121]      FIGS. 14 and 14   a  to  14   e  are views showing a shifting state of the links  14  from the seating mode to the luggage mode according to present disclosure. 
         [0122]    The front upper link  17 , the front lower link  18 , the main link  19 , the guide link  20 , and the rear link  21  move in one direction together to improve the ability of the seat  10  to simultaneously secure wide luggage and seat spaces. 
         [0123]    For example, the front upper and front lower links  17  and  18  support the front-end portion of the seat cushion frame  35 , which are adjustably and foldably connected, so that it is possible to shift between the seating mode and the luggage mode. 
         [0124]    Referring to  FIG. 14   a , when shifting from the seating mode to the luggage mode, the upper-end portion of the seat cushion  12  diagonally rotates as the front upper link  17  is completely adjusted (seat standard state). The slope of the front upper link  17  is then reversed after the horizontal state of the front upper link  17  is adjusted. The upper-end portion of the seat cushion  12  is slightly, diagonally disposed in the opposite direction in the storage state of the seat  10 . In this case, the front upper link  17  is entirely moved downward. 
         [0125]    Referring to  FIG. 14   b , when shifting from the seating mode to the luggage mode, the upper-end portion of the seat cushion  12  downwardly rotates about the fourth hinge  25  as the front lower link  18  is completely adjusted (seat standard state). The upper-end portion of the seat cushion  12  is diagonally disposed toward the horizontal state in the storage state of the seat  10 . In this case, the front lower link  18  is moved downward. 
         [0126]    The main link  19  connects the front upper link  17  and the seat back frame  35 . When shifting from the seating mode to the luggage mode, the seat back  11  can be folded by backwardly pulling the front upper link  17 , and simultaneously folding the front upper and front lower links  17  and  18 . 
         [0127]    Referring to  FIG. 14   c , when shifting from the seating mode to the luggage mode, the front-end and rear-end portions of the main link  19  harmoniously move from the 4 to 5 o&#39;clock direction. 
         [0128]    The guide link  20  connects the main and rear links  19  and  21 , constantly maintains the interval between the main and rear links  19  and  21  when shifting from the seating mode to the luggage mode, and uniformly transfers the weight of the seat  10  to the main and rear links  19  and  21 , thereby improving the durability of the links  14 . 
         [0129]    Referring to  FIG. 14   d , when shifting from the seating mode to the luggage mode, the guide link  20  is in an almost horizontal state at the standard position of the seat  10 . The front-end portion of the guide link  20  further rotates than that of the rear-end portion of the guide link  20 . In the storage state of the seat  10 , the front-end portion of the guide link  20  is disposed on the bottom of the storage space  13 , and the rear-end portion of the guide link  20  is disposed on the rear of the storage space  13 . In this case, the guide link  20  moves from the lower direction to the rear lower direction. 
         [0130]    The rear link  21  supports the weight of the seat cushion frame  35  by connecting the rear-end portion of the seat cushion frame  35  and the rear of the storage space  13  and lowers the seat cushion frame  35 . 
         [0131]    Referring to  FIG. 14   e , when shifting from the seating mode to the luggage mode, the upper-end portion of the rear link  21  is positioned at an outer upper portion of the storage space  13  from the standard position of the seat  10 . However, the upper-end portion of the rear link  21  is positioned on the bottom of the storage space  13  from the storage position of the seat  10 . The front-end portion of the rear link  21  moves downwardly about the ninth hinge  30 . 
         [0132]    As such, all of the links  14  constantly move in the lower direction, so that the seat  10  can uniformly and lightly manipulate when shifting from the seating mode to the luggage mode of the seat. 
         [0133]    When the seat  10  is stored in the storage space  13  and pressed until the seat back  11  is in the horizontal state, the folding state of the seat back  11  can be maintained by the cushion locking latch  36  and the recliner  16 . 
         [0134]      FIG. 15  is a view showing a shifting state from the luggage mode to the seating mode according to the present disclosure. 
         [0135]    2. Seating Mode 
         [0136]    The locking state between the recliner  16  and the cushion locking latch  36  is released by moving the operation strap  41  of the seat back  11  in the front direction. 
         [0137]    When the operation strap  41  is moved forward in the front direction, the seat back rotation lever  49  rotates at a predetermined angle, and the fixing projections  50  of the seat back rotation lever  49  rotate. Thus, the back recliner release right and left cables  42  and the connection cables  44 , coupled to the respective fixing projections  50 , are extracted to a predetermined length by the rotation angle of the fixing projections  50 . 
         [0138]    Subsequently, when the back recliner release right and left cables  42  are pulled, the recliner release lever  45  angularly rotates, thereby releasing the recliner  16 . 
         [0139]    When the connection cables  44  are pulled, the fixing projections  50  of the seat cushion rotation lever  53  mounted to the seat cushion frame  35  rotate in one direction. Thus, the cushion locking release right and left cables  43  coupled to the respective fixing projections  50  are extracted by the rotation angle of the fixing projections  50 . 
         [0140]    Subsequently, if the cushion locking release right and left cables  43  are pulled, the cushion locking latches  36  respectively mounted to the left and right sides of the seat cushion frame  35  angularly rotate backward, thereby releasing the locking state of the latch  36 . 
         [0141]    When the locking of the latch  36  is released, the front upper and front lower links  17  and  18  are adjusted to remain unfolded by the elastic recovery force of the torsion spring  32  mounted therebetween. 
         [0142]    If the recliner  16  is released, the seat back Ills adjusted to rotate backward from the seat cushion  12  by the elastic recovery force of the spiral spring  33 . 
         [0143]    As the main link  19 , the guide link  20 , and the rear link  21  move upward through the adjustment operation of the front upper and lower links  17  and  18 , the seat cushion  12  and the seat back  11  are simultaneously adjusted for a passenger to sit on the seat  10 . 
         [0144]    1. Improvement Effect in Modification of Link Structure 
         [0145]      FIG. 16  is a view showing the effect that the hardness of a back side bracket  57  is enhanced by the modified structure of the guide link  20  according to the present disclosure.  FIG. 17  is a view showing a state in which an exposed external appearance of the guide link is removed when the structure of the guide link  20  is modified according to the present disclosure. 
         [0146]    1) The guide link  20  connects the main link  19  and the rear link  19 . The connection portion of the guide link  20  can be removed from the back side bracket  57 , thereby enhancing the hardness of the back side bracket  57  by avoiding stress concentration ( FIG. 16 ). 
         [0147]    2) One of side covers  58  is removed by assembling the guide link  20  to the main link  19 , so that only one side cover  58  can be used. Further, the aesthetic improvement of the link can be obtained by removing the exposure of the external appearance of the link ( FIG. 17 ). 
         [0148]    2. Improvement of Assembling Method of Rear Mounting 
         [0149]    The assembling method of rear mounting of the seat  10  can be improved using seat attaches  59  and a rear mounting bracket  63 . 
         [0150]    1) Configuration and Effect of Seat Attaches  59  and Rear Mounting Bracket  63   
         [0151]      FIG. 18  is a perspective view of a state in which the seat attaches  59  are mounted according to the present disclosure.  FIG. 19  is a view showing the effect that the stress concentration of the seat attaches  59  prevents according to the present disclosure. 
         [0152]    As shown in  FIG. 18 , the seat attaches  59  are manufactured separately from the seat  10  and fixed at three locations of the rear side in the storage space  13 . The seat attaches  59  are spaced apart from one another in a width direction of the vehicle before the rear link  21  of the seat  10  is assembled to the of the storage space  13 , thereby improving assembling performance and workability. 
         [0153]    The rear mounting bracket  63  is hinge-coupled to the rear-end portion of the rear link  21 . The rear mounting bracket  63  has a turned-over ‘U’ shape. 
         [0154]    The rear-end portion of the rear link  21  is coupled to the rear mounting bracket  63  by the ninth hinge  30  at both upper portions of the rear mounting bracket  63 , and a guide pin protrudes from the rear mounting bracket  63  in the side direction at both lower portions of the rear mounting bracket  63 . 
         [0155]    The seat attach  59  includes an attach main body  60  attached to the rear of the storage space  13 . A protruding plate  61  fixes the mounting bracket, which is horizontally protruded forward from the middle in the vertical length direction of the attach main body  60 . A guide groove  62  protrudes forward in a ‘U’ shape on the left and right side at lower ends of the attach main body  60 . 
         [0156]    Referring to  FIG. 19 , upper and lower sides of the attach main body  60  are respectively assembled by bolts, based on the ninth hinge  30  of the rear link  21 , thus avoiding stress concentration caused by the vertical rotation moment when the rear link  21  is rotated in the vertical direction and enhancing the hardness of the seat attach  59 . 
         [0157]    2) Improvement of Assembling Performance of Seat  10  Using Fixed-Type Rear Mounting Bracket  63   
         [0158]      FIG. 20  is a view showing a state in which the rear link  21  and the rear mounting are assembled according to the present disclosure. A mounting bracket fixing frame  64  prevents the rear mounting bracket  63  from rotating in the front-back direction about the ninth hinge  30  of the rear link  21 , thereby improving the assembling performance of the seat  10 . 
         [0159]    More specifically, the mounting bracket fixing frame  64  is horizontally fixed to the bottom of the storage space  13  by connecting both end portions of the mounting bracket fixing frame  64  to the front mounting frame  37 . The mounting bracket fixing frame  64  has an irregular portion  65  formed in a ‘U’ shape having end portions protruding downward while being spaced apart from each other at a predetermined interval with the central portion interposed therebetween. The irregular portion  65  is connected to the top surface of the rear mounting bracket  63  by a fastening means through welding etc., to prevent the rear mounting bracket  63  from rotating. 
         [0160]    If the rear mounting bracket  63  has a rotatable structure, the workability and assembling performance of the seat  10  is decreased due to the interference of the rear mounting bracket  63  with the vehicle body (storage space  13 ) when the seat  10  is assembled. Accordingly, the assembling performance of the seat  10  can be improved by preventing the rotation of the rear mounting bracket  63 . 
         [0161]    3) Improvement of Assembling Performance of Seat  10  Using Guide Shape of Seat Attach  59   
         [0162]      FIG. 21  is a perspective view showing a state in which the rear link  21  is assembled according to the present disclosure. The assembling performance of the seat  10  can be improved using the U-shaped guide groove portion  62  disposed at both sides of the seat attach  59 . 
         [0163]    For example, the rear link  21  is coupled to the upper rear end of the storage space  13  by the ninth hinge  30 . In this case, the seat attach  59  is assembled in a state in which the rear mounting bracket  63  is coupled to the rear-end portion of the rear link  21  by the ninth hinge  30 . The rear mounting bracket  63  is first assembled to the seat attach  59  and then fastened to the seat attach  59  using a bolt. 
         [0164]    More specifically, when a guide pin  66  protruding sideward from both lower ends of the rear mounting bracket  63  is latched to the U-shaped guide groove portion  62  formed at both the sides of the seat attach  59 , i.e., when the rear mounting bracket  63  is first assembled to the seat attach  59 , the rear mounting bracket  63  can be easily assembled to the seat attach  59  without lifting a back portion of the seat  10 . 
         [0165]    4) Application of Seat Attach  59  to Prevent Seat  10  from Drooping Downward After Seat  10  is Assembled 
         [0166]      FIG. 22  is a view showing a state in which the rotation of the seat  10  is prevented when the seat  10  is assembled according to the present disclosure. The protruding plate  61  protrudes on the attach main body  60  of the seat attach  59  outward, having a bolt aperture so that the rear mounting bracket  63  is bolted to the seat attach  59 . 
         [0167]    The rear mounting bracket  63  has a turned-over ‘U’ shape. The rear mounting bracket  63  is mounted on the protruding plate  61  of the seat attach  59  so as to be latched to the protruding plate  61  by inserting the protruding plate  61  of the seat attach  59  into the rear mounting bracket  63  through an opening positioned at the lower end of the rear mounting bracket  63 . 
         [0168]    The rear mounting bracket  63  is supported by the protruding plate  61  of the seat attach  59 , thus preventing the seat  10  from drooping downward. 
         [0169]    5) Easy Recognition of Bolt Aperture in Assembling of Back Portion of Seat  10  After Seat  10  is Assembled 
         [0170]      FIG. 23  is a perspective view showing a state in which a rear mounting aperture is used in a vertical assembling method according to the present disclosure. A bolt aperture is formed at an upper-end portion of the rear mounting bracket  63 . The bolt aperture formed in the irregular portion  65  of the mounting bracket fixing frame, which is  64  coupled to the upper-end portion of the rear mounting bracket  63 , has the same size as the bolt aperture of the rear mounting bracket  63 . 
         [0171]    The assembling method of the rear mounting bracket  63  will be described. The rear mounting bracket  63  is bolt-fastened to the seat attach  59  where the rear mounting bracket  63  and the mounting bracket fixing frame  64  are disposed on the protruding plate  61 . The bolt aperture of the rear mounting bracket  63  corresponds to the bolt aperture formed in the protruding plate  61  of the seat attach  59 , thereby completing the assembling. 
         [0172]    The assembling method is a vertical assembling method. The bolt aperture can be easily recognized when the rear mounting bracket  63  is assembled, thereby improving workability. 
         [0173]    3. Application of Cushion Locking Latches  36   
         [0174]    The cushion locking latches  36  are respectively applied to both sides of the seat cushion frame  35  to prevent the seat  10  from being released from the floor caused by irregular driving, vehicle collision, etc., thereby preventing an accident. 
         [0175]    In a case where the cushion locking latch  36  is applied to only one side of the seat cushion frame  35 , stress concentration occurs in one latch  36  by irregular driving, etc., thereby damaging the cushion locking latch  36 . The cushion locking latches  35  may be respectively applied to both sides of the seat cushion frame  35 . 
         [0176]    Further, the various kinds of release cables connected to the cushion locking latch  36  are firmly attached to the seat cushion frame  35  without drooping. Thus, the cables are not exposed to the outside. 
         [0177]    4. Decrease in Number of the Various Cables and Components by Using Recliner  16  and the Operation Strap  41  for Releasing Cushion Locking Latch  36   
         [0178]    The back recliner release lever assembly  46  for releasing the locking of the recliner  16  is mounted to the seat back frame  34 , and the cushion locking release lever assembly  47  for releasing the cushion locking latch  36  is mounted to the seat cushion frame  35 . Thus, the operation strap  41  is connected to the back recliner release lever assembly  46 , and the connection cable  44  is connected between the back recliner release lever assembly  46  and the cushion locking release lever assembly  47 . Therefore, the back recliner release lever assembly  46  and the cushion locking release lever assembly  47  are simultaneously operated by moving only one operation strap. Accordingly, the locking of the seat  10  can be easily released, and the number of various release cables and components can be decreased. 
         [0179]    The disclosure has been described in detail with reference to exemplary embodiments thereof. However, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the appended claims and their equivalents.