Abstract:
A vehicle seat device includes a lower rail fixed on a vehicle floor, a seat supporting member slidably supported on the lower rail and possessing a flat portion at its front upper part and a flange extending inwardly at its rear part, and a seat cushion frame having horizontal flat portions. The horizontal flat portions are set on and spot-welded to the flat portion and the flange.

Description:
This application is based on and claims priority under 35 U.S.C. §119 with respect to Japanese Application No. 10(1998)-261803 filed on Sep. 16, 1998, the entire content of which is incorporated herein by reference. 
     FIELD OF THE INVENTION 
     The present invention generally relates to a vehicle seat. More particularly, the present invention pertains to a vehicle seat provided with a fixture mechanism for fixing between seat supporting members and seat frames. 
     BACKGROUND OF THE INVENTION 
     Unexamined Published Japanese Patent Application (Kokai) No. Hei 6-55961 discloses a seat device that includes a pair of lower rails fixed on a vehicle floor, a pair of upper rails which slide on the lower rails, and lower frames which are fixed with a seat cushion frame (or pan) and which are also fixed to the upper rails by bolts. On the seat assembly line, a floor side member unit which includes a lower rail and an upper rail are fixed by bolts with a seat side member which includes a lower arm. 
     In this known type of seat device, overlapping portions exist between the floor side member unit and the seat side member for purposes of effecting the bolt fixing. This inevitably increases the seat width dimensions. Also, the bolt fixing process adds time to the assembly process, and the parts management associated with the bolt and nut fixation brings about increased costs. 
     In light of the foregoing, a need exists for a seat device that is not susceptible to the same disadvantages and drawbacks as other known seat devices. 
     SUMMARY OF THE INVENTION 
     In light of the above, the present invention provides a vehicle seat device that includes a lower rail fixed on a vehicle floor, a seat supporting member slidably supported on the lower rail and possessing a flat portion at its front upper part and a flange extending inwardly at its rear part, and a seat cushion frame having horizontal flat portions. The horizontal flat portions are set on and spot-welded to the flat portion and the flange. 
     According to another aspect of the invention, a seat device mounted in a vehicle includes a lower rail fixed on a vehicle floor, a seat supporting member slidably supported on the lower rail and possessing a flange extending towards one side of the seat supporting member, and a seat cushion frame having a horizontal flat portion. The horizontal flat portion of the seat supporting member is set on and welded to the flange. 
     In accordance with a further aspect of the invention, a seat device mounted in a vehicle includes a lower rail fixed on a vehicle floor, a seat supporting member slidably supported on the lower rail and possessing a flange extending towards an outer side of the seat supporting member, with the flange being provided with a skirt portion possessing clips. A seat cushion frame is fixed to the seat supporting member and a seat pad is positioned on the seat cushion. The seat cushion cover is provided with elements that engage the clips on the skirt of the flange. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     The foregoing and additional features of the present invention will become more apparent from the following detailed description considered with reference to the accompanying drawing figures in which like elements are designated by like reference numerals and wherein: 
     FIG. 1 is a perspective view of a part of seat frame in accordance with the present invention; 
     FIG. 2 is an exploded perspective view showing the seat frame according to the present invention; and 
     FIG. 3 is a cross-sectional view of a part of the seat device in accordance with the present invention taken along the section line III—III in FIG.  1 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As shown in FIG. 1, the seat device  1  according to the present invention includes a pair of oppositely positioned lower rails  2 , a pair of oppositely positioned upper rails  3  which each slide on a respective one of the lower rails  2 , a pair of lower arms  4  each fixed to a respective one of the upper rails  3  by bolts or rivets, and a seat cushion frame (or pan)  5  welded to the pair of lower arms  4 . The figures illustrate only one of the lower rails and only one of the upper rails located on one side of the seat cushion frame. It is to be understood however that the other lower rail and upper rail are located on the opposite side of the seat cushion frame. 
     A seat supporting member is constituted by a combination of the upper rail  3  and the lower arm  4  located on one side of the seat cushion frame. In this embodiment, the upper rail  3  is separate from and fixed to the lower arm  4 . However, the upper rail  3  and the lower rail  4  can be made as one part and can be formed by pressing one plate. The seat supporting member may be dealt with as one part in the manufacturing and assembly process. 
     As shown in FIGS. 1 and 2, each of the lower arms  4  which forms part of the respective seat supporting member is provided with a flange  6  extending generally about the peripheral edge and towards the outward side of the seat. The front upper portion of the flange  6  has a horizontally flat part  7 , while the front lower portion of the flange  6  possesses a skirt portion  9  that extends downward. As shown in FIGS. 2 and 3, a pair of clips  10  is formed on the skirt portion  9 . 
     An L-shaped bracket  11  is fixed on the inner surface of each lower arm  4  at the rear portion of the lower arm  4 . As shown in FIG. 1, the brackets  11  serve a dual purpose. In one respect, the brackets  11  connect the lower arm  4  to the respective upper rail  3  near the rear portion of the lower arm  4  and the upper rail  3 . In addition, the brackets  11  provide a horizontal surface or flange  12  on which is set the seat cushion frame (or pan)  5 . Of course, the flange  12  could be formed as a part of the lower arm to eliminate the bracket  11 . 
     The opposite side portions of the seat cushion frame (or pan)  5  have a pair of horizontal flat portions  13 ,  13  on which the flat portion  7  of the lower arm  4  and the flange  12  of the bracket  11  are set. The horizontal flat portions  13 ,  13  on each side of the seat cushion frame (or pan)  5  may be spaced apart from one another or may be formed as an elongated flat portion. 
     During assembly, the guide rails  2 ,  3 , the bracket  11 , and the lower arm  4  on each side are assembled as one part. After setting the flat portions  13 ,  13  of the seat cushion frame  5  (or pan) on the flat portions  7  of the lower arms  4  and on the flanges  12  of the brackets  11 , spot-welding is performed at these contact portions. The flanges  6  and the flat portions  13 ,  13  protrude to the outer side of the seat, thus facilitating the spot-welding process. 
     As shown FIG. 3, a seat pad  14  is set on the seat cushion frame  5 , and hooks disposed along the edge of the cover  15  are engaged with the clips  10  on the skirt portion  9 . The seat assembly process is thus completed. 
     In the above described embodiment of the present invention, the seat supporting members are formed by the fixed combination of the upper rail  3  and the lower arm  4 . However, the upper rail  3  and the lower arm  4  on each side may be connected by a pivot pin at their front or rear ends. In such an alternative, the flange  12  may be formed on the lower arm  4 , with the bracket  11  being eliminated. 
     The principles, preferred embodiments and mode of operation of the present invention have been described in the foregoing specification. However, the invention which is intended to be protected is not to be construed as limited to the particular embodiments described. Further, the embodiments described herein are to be regarded as illustrative rather than restrictive. Variations and changes may be made by others, and equivalents employed, without departing from the spirit of the present invention. Accordingly, it is expressly intended that all such variations, changes and equivalents which fall within the spirit and scope of the invention be embraced thereby.