Abstract:
An electricity supplying structure on motor vehicle sliding door, is provided, which includes: a sliding door; a guide rail provided on the sliding door; a slider to slidably engage the guide rail; and a wiring harness secured to the slider and extending to a vehicle body side; wherein a bent portion is formed on the wiring harness between the slider and the vehicle body side. The structure further includes a wiring harness supporting guide provided over the guide rail for hanging the wiring harness therefrom toward the slider and also a reel to pull the slider in a single direction. The guide rail is a plate having a slit for the slider. The structure further includes a coil member to be fitted on the whole bent portion of the wiring harness or the coil member may be arranged on each of both end portions of the bent portion. In the structure, the wiring harness is of a tough-rubber sheath cable, and one end of the bent portion of the wiring harness may be connected to a connector to be coupled with a mating connector secured to the vehicle body. Substituting for the wiring harness supporting guide the reel, the structure may include a pair of linking arms arranged on an upper side of the guide rail and linked to each other, one of the linking arms being connected to the slider and the other of the linking arms being connected to an end side of the guide rail, wherein the wiring harness is arranged on the linking arms. Thus, a structure, wherein a connecting position between the door side wiring harness and the body side wiring harness remains still when the sliding door is opened or closed, is realized.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to an electricity supplying structure on motor vehicle sliding door and more particularly, to an electricity supplying structure on motor vehicle sliding door wherein a sliding block to which a door side wiring harness is secured engages slidably a guide rail provided on a motor vehicle sliding door so that a connecting position between the door side wiring harness and the body side wiring harness remains still when the sliding door is opened or closed. 
     2. Description of the Related Art 
     Various means for connecting a door the wiring harness provided for auxiliary units such as a power window motor, a door locking unit, a speaker, and the like installed in a sliding door of a motor vehicle to a body side (i.e. an electricity supply side) wiring harness have been provided, conventionally. 
     FIG. 16 shows, for an example, a prior art electricity supplying structure on motor vehicle sliding door disclosed in Japanese U. M. Reg. Application Laid-open No. 4-124555. Referring to FIG. 16, auxiliary units  102  in the sliding door  101  are connected to a wiring harness  104  through a controller  103 , and the end of the wiring harness  104  is connected to a contact point  105  provided on the door front end portion. Another contact point  107  connected to a battery  109  through a wiring harness  108  is provided on the body  106 . The contact point  107  is connected to the contact point  105  through a movable contact point (not shown) provided for dustproofing and waterproofing. 
     With respect to the above structure, however, electric connection is made only when the sliding door  101  is closed, and accordingly the auxiliary units installed thereon can not operate in case that the sliding door  101  opens even a little. And, the movable contact point (not shown), which causes a double contact points, increases contact resistance, thereby lowering contact reliability. 
     Also, Japanese U. M. Reg. Application Laid-open No. 5-28893 discloses another electricity supplying structure on building door (not shown), wherein a pair of tubular arms are linked with a lining axis, one of the arms is fixed to a building door, the other of the arms is fixed to a building, and an electric wire is put through the arms. 
     The above structure, however, cannot be applied to a motor vehicle sliding door which moves two-dimensionally or three-dimensionally on opening or closing. 
     In order to solve the above problems, other electricity supplying structures on motor vehicle sliding door shown in FIGS. 17A,  17 B,  18 A, and  18 B are disclosed in Japanese Patent Application Laid-open No. 7-222274. 
     In the structure shown in FIGS. 17A and 17B, a supporting bar  113  is provided along a guide rail  112  attached to a portion of a vehicle body  117  relative to a sliding door  111 , and an electric wire (i.e. a wiring harness)  114  spirals on the supporting bar  113 . One end of the electric wire  114  is connected to a speaker  116  installed in the sliding door  111  by way of a hinge  115  and the other end of the electric wire  114  is connected to an audio set (not shown) installed on the vehicle body  117 . In a door-closed state of FIG. 17A the electric wire  114  extends along the supporting bar  113 , and in a door-opened state of FIG. 17B the electric wire  114  is compressed. 
     And, in the structure shown in FIGS. 18A and 18B, a reel  120  capable of winding and releasing an electric wire (i.e. a wiring harness)  119  during opening-closing movement of a sliding door  118  is provided on a vehicle body  121 . One end of the electric wire  119  is connected to a speaker  123  installed in the sliding door  119  by way of a hinge  122  and the other end of the electric wire  119  is connected to an audio set (not shown) installed on the vehicle body  121 . In a door-closed state of FIG. 18A the electric wire  119  extends from the reel  120 , and in a door-opened state of FIG. 18B the electric wire  119  is wound by the reel  120 . 
     With respect to the structure shown in FIGS. 17A and 17B, however, the spiral electric wire  114  requires a longer electric wire, which causes a higher electric loss. And, a wiring harness having electric wires with a larger diameter or having a larger number of electric wires, which has a poor bending property and requires a larger accommodation space, can not be applied to this method. 
     And, with respect to the structure shown in FIGS. 18A and 18B, however, a complicated mechanism for preventing the electric wire  119  from twisting is required. And also, a wiring harness having electric wires with a larger diameter or having a larger number of electric wires, which has a poor bending property and requires a larger accommodation space, can not be applied to this method. Further, with respect to the structures shown in FIGS. 17A,  17 B,  18 A, and  18 B, since the electric wires  114 , 119  are bent and extended iteratively, conductors of the electric wires  114 , 119  are likely to be damaged. 
     SUMMARY OF THE INVENTION 
     In view of the foregoing, an object of the present invention is to provide an electricity supplying structure on motor vehicle sliding door which can solve the above-described problems, wherein a slider, to which a door side wiring harness is secured, engages slidably a guide rail provided on a motor vehicle sliding door so that a connecting position between the door side wiring harness and the body side wiring harness remains still when the sliding door is opened or closed. 
     In order to achieve the above-described object, as a first aspect of the present invention, an electricity supplying structure on motor vehicle sliding door in accordance with the present invention includes: a sliding door; a guide rail provided on the sliding door; a slider to slidably engage the guide rail; and a wiring harness secured to the slider and extending to a vehicle body side; wherein a bent portion is formed on the wiring harness between the slider and the vehicle body side. 
     As a second aspect of the present invention, in the structure with the above first aspect, the electricity supplying structure further includes a wiring harness supporting guide provided over the guide rail for hanging the wiring harness from the wiring harness supporting guide toward the slider. 
     As a third aspect of the present invention, in the structure with the above second aspect, the electricity supplying structure further includes a reel to pull the slider in a single direction. 
     As a fourth aspect of the present invention, an electricity supplying structure on motor vehicle sliding door in accordance with the present invention includes: a sliding door; a guide rail provided on the sliding door; a slider to slidably engage the guide rail; a pair of linking arms being linked to each other, one end of the linking arms being connected to the slider and the other end of the linking arms being connected to the sliding door; and a wiring harness arranged by way of the pair of linking arms to the slider and extending to a vehicle body, wherein a bent portion is formed on the wiring harness between the slider and the vehicle body. 
     As a fifth aspect of the present invention, in the structure with the above fourth aspect, the pair of linking arms are arranged on an upper side of the guide rail. 
     As a sixth aspect of the present invention, in the structure with any one of the above aspects, the guide rail is a plate having a slit and the slider has a supporting axis to slide in the slit. 
     As a seventh aspect of the present invention, in the structure with either one of the above fourth and fifth aspects, the one of the pair of linking arms is connected to the slider by means of an axis portion and the axis portion engages the slit of the guide rail. 
     As an eighth aspect of the present invention, in the structure with any one of the above aspects, the electricity supplying structure further includes a coil member to be fitted on the bent portion of the wiring harness. 
     As a ninth aspect of the present invention, in the structure with the above eighth aspect, the coil member is arranged on each of both end portions of the bent portion. 
     As a tenth aspect of the present invention, in the structure with any one of the above aspects, the wiring harness is of a tough-rubber sheath cable. 
     As an eleventh aspect of the present invention, in the structure with any one of the above aspects, one end of the bent portion of the wiring harness is connected to a connector to be coupled with a mating connector secured to the vehicle body side. 
     According to the above-described structure of the present invention, the following advantages are provided. 
     (1) Since the slider remains substantially still relative to the vehicle body when the sliding door is opened or closed and simultaneously since the bent portion is provided on the wiring harness between the slider and the vehicle body, the wiring harness can smoothly respond to three-dimensional opening-closing movement of the sliding door, thereby preventing extension and shrinkage of the wiring harness and consequently preventing damage of the wiring harness. And, since length of the wiring harness can be shorter, an electric loss can be less. 
     (2) Since the structure of hanging the wiring harness from the wiring harness supporting guide to the slide is simple, a required space in the door thickness direction can be small, thereby enabling the present structure to be applied to the sliding door of a thin type. 
     (3) Since the slider is pulled by the reel and simultaneously receives resilience of the bent portion of the wiring harness, the slider can more securely remains substantially still relative to the vehicle body when the sliding door is opened or closed and also during a run of the vehicle, thereby preventing the wiring harness from swinging, slackening, wearing, making a noise, or the like, while realizing a simple structure. 
     (4) Since a pair of linking arms help the slider slide, the slider can smoothly move for remain itself still relative to the vehicle body, thereby protecting the bent portion of the wiring harness, while realizing a simple structure. And, since the wiring harness is supported by the linking arms, the wiring harness is prevented from hanging down and tangling when the sliding door is opened or closed, thereby protecting the wiring harness from wear due to contact and friction. Also, since the wiring harness bends integrally with the linking arms when the sliding door is opened or closed, the wiring harness can be bent smoothly. 
     (5) Since the linking arms are likely to open each other due to their own weight, the slider can be smoothly and securely shifted to the rear end side of the guide rail. 
     (6) Since the guide rail is a plate, the sliding door can be thin, and since the supporting axis of the slider slides in the slit, the slider can smoothly and securely move. 
     (7) The axis portion of one of the linking arms enables the one of the linking arms to smoothly pivot on the slider and also enables the slider to smoothly and securely slide along the guide rail. 
     (8) Since coil member is put around the bent portion of the wiring harness, the bent portion is protected from wear or the like, is kept in a smoothly bent shape, and is prevented from being folded or from winding caused by movement of the slider. 
     (9) Since the coil member is arranged on each of both end portions of the bent portion, the corresponding portions of the bent portion can be protected from wear or the like and simultaneously form-retaining effect of the bent portion can be improved. 
     (10) Since the tough-rubber sheath cable used as the wiring harness enables the wiring harness to have a completely circular cross-section, the wiring harness should have a uniform bending property in all directions, thereby facilitating arranging work thereof and enabling the wiring harness to have a larger number of electric wires for auxiliary units therein. And, the tough-rubber sheath cable has a good form-retaining property suitable for the bent portion and also can facilitate end-treating work thereof such as cutting, peeling, and pressure-welding to a terminal. 
    
    
     The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view showing a first embodiment of an electricity supplying structure on motor vehicle sliding door in accordance with the present invention; 
     FIG. 2 is a perspective view showing an embodiment of a bent portion of a wiring harness; 
     FIG. 3 is a perspective view showing another embodiment of a bent portion of a wiring harness; 
     FIG. 4 is a cross-sectional view showing a tough-rubber sheath cable as an embodiment of a wiring harness; 
     FIG. 5 is a front view of a sliding door in a closed state; 
     FIG. 6 is a front view of the sliding door in an opened state; 
     FIG. 7 is a plan view of the sliding door in the closed state; 
     FIG. 8 is a plan view of the sliding door on the way to open; 
     FIG. 9 is a plan view of the sliding door in the opened state; 
     FIG. 10 is a perspective view showing a second embodiment of an electricity supplying structure on motor vehicle sliding door in accordance with the present invention; 
     FIG. 11 is a side view, partly in section, showing an assembled state of linking 
     FIG. 12 is a front view showing a working state of the linking arms on a guide rail; 
     FIG. 13 is a plan view, partly in section, showing a setting state of the linking arms; 
     FIG. 14 is a perspective view showing an embodiment of a bent portion of a wiring harness; 
     FIG. 15 is a perspective view showing another embodiment of a bent portion of a wiring harness; 
     FIG. 16 is a perspective view showing a prior art electricity supplying structure on motor vehicle sliding door; 
     FIG. 17A is a longitudinal-sectional view showing another prior art electricity supplying structure on motor vehicle sliding door in a door-closed state; 
     FIG. 17B is a longitudinal-sectional view showing another prior art electricity supplying structure on motor vehicle sliding door in a door-opened state; 
     FIG. 18A is a longitudinal-sectional view showing still another prior art electricity supplying structure on motor vehicle sliding door in a door-closed state; and 
     FIG. 18B is a longitudinal-sectional view showing still another prior art electricity supplying structure on motor vehicle sliding door in a door-opened state. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. 
     FIGS. 1-9 show a first embodiment of an electricity supplying structure (or mechanism) on motor vehicle sliding door in accordance with the present invention. 
     As shown in FIG. 1, a sliding door  1  is provided with a horizontal guide rail  3  on a lower portion of an inner panel  2 , and a guide rail  3  is engaged with a sliding block (i.e. a slider)  4  slidably. And, the sliding block  4  is pulled by a reel  5  rearward, namely in a door-opening direction. A middle portion of a door side wiring harness  6  is fixed to the sliding block  4 . One of the wiring harness  6  is supported by a guide roller (i.e. a guide portion)  7  and the other is connected to a body side wiring harness  9  by means of connectors  10 , 11  on a body  8  side (i.e. a battery side), while bending in a substantially U-shape. In the description a vehicle running-direction is defined as “front”. 
     The guide rail  3 , the sliding block  4 , the reel  5 , and the guide roller  7  constitute an electricity supplying mechanism A on motor vehicle sliding door of the present embodiment. The reel  5  is fixed to the inner panel  2  at the rearward of the guide rail  3 , and the guide roller  7  is rotatable secured to the inner panel  2  in the vertically middle portion thereof. The connectors  10 , 11  of the door side and body side wiring harnesses  6 , 9  are fixed inside a vertical wall  13  of a step portion  12  of the body  8 . The sliding door  1  slidably engages a rail  15  (FIG. 7) provided on the body  8  by means of a hinge roller  14  at the lower end of the sliding door  1 . 
     The guide rail  3  is formed with a slit  17  in the vertical middle of a straight plate portion  16 , and the plate portion  16  is provided with secured portions  18 - 20  at the both ends and in the horizontal middle thereof. Each of the secured portions  18 - 20  is fixed to the inner panel  2  with a ring spacer  21  and a bolt  22 , which spacer  21  makes a gap  23  between the inner panel  2  and the guide rail  3 . And, the slit  17  of the guide rail  3  is engaged with a supporting axis  24  of the sliding block  4 , that is, a flange portion (not shown) formed at the end of the supporting axis  24  is positioned in the gap  23  at the back of the guide rail  3 . For example, the supporting axis  24  is provided with a bearing (not shown) on the periphery so that the sliding block  4  can smoothly move along the slit  17 . 
     The reel  5  has a spring means (not shown) to wind a wire  26  inside a reel assembly  25  so that the wire  26  extending from a nozzle  27  is pulled all the time. The end of the wire  26  is connected to the rear end of the sliding block  4  for pulling the sliding block  4  rearward all the time. The reel  5  is provided for easier slide of the sliding block  4  rearward when the sliding door  1  is closed. Tensile force due to the reel  5  is in a range of at least straightening the door side wiring harness  6 . 
     The guide roller (i.e. a wiring harness supporting guide)  7  consists of an axis portion  28  fixed to the inner panel  2  above the guide rail  3  and a roller  29  being rotatable around the axis portion  28  by means of, for example, a bearing and having a groove  30  with a semicircular cross-section for the door side wiring harness  6 . A guide shaft (not shown) (i.e. another wiring harness supporting guide) having the similar groove may substitute for the rotatable guide roller  7 . 
     The door side wiring harness  6  swings due to a movement of the sliding block  4  in a state of hanging down from the guide roller  7 . A front end portion of the wiring harness  6  horizontally shortly extends forward from the guide roller  7  and is connected to a connector  31  which is coupled with a mating connector connected to a wiring harness for auxiliary units (not shown) such as a power window motor, a door locking unit, a speaker, and the like mounted inside the sliding door. The connector  31  is fixed to the inner panel  2 . 
     A lower portion of the wiring harness  6 , that is, a bent portion  38  formed in a substantially U-shape between the sliding block  4  to the body  8  side, bends forward and is connected to a connector  10  which is coupled with a mating connector  11  connected to the body side wiring harness  9  as an electricity supplying line. The body side wiring harness  9  extends forward to a battery side along an inside of a wall of the step  12 . For example, the connector  10  is of male type and having a female terminal (not shown) inside a connector housing of synthetic resin, and the connector  11  is of female type and having a male terminal (not shown) inside a connector housing. 
     As shown in FIG. 2, the sliding block  4  is formed in rectangle and has a step portion  32  in the horizontal middle thereof. The door side wiring harness  6  projects forward from the step portion  32  and bends substantially downward. The rear half portion of the sliding block  4  is formed thick as a thick portion  33  to which a pressing plate  34  is secured for putting the wiring harness  6  therebetween. The pressing plate  34  is formed with an arched portion  35  bulging outward and bending by approximately 90 degrees, and the thick portion  33  is provided with a groove  36  relative to the arched portion  35 . And, the pressing plate  34  is secured to the thick portion  33  with small screws  37 , and the wiring harness  6  is put between the groove  36  and the arched portion  35 . 
     A coil spring (i.e. a coil member)  39  is put around the bent portion  38  of the door side wiring harness  6 . The coil spring  39  protects the bent portion  38  against wear or the like, keeps the bent portion  38  in a smoothly bent shape, and prevents the bent portion  38  from being folded or from winding caused by movement of the sliding block  4  thereby to prevent a breakage of the bent portion  38 . 
     Both ends of the coil spring  39  push the step portion  32  of the sliding block  4  and an end plane  10   a  of the connector  10 , respectively, due to its spring force without parting from the step portion  32  and the end plane  10   a . The both ends of the coil spring  39  may be secured to the sliding block  4  and the connector  10  by an engaging means (not shown). The coil spring  39  with an inner diameter not larger than an outer diameter of the wiring harness  6  may be fitted on the periphery of the wiring harness  6 . 
     As shown in FIG. 3, coil springs (i.e. as a coil member)  40 , 41  may partially be provided at a sliding block  4  side and a connector  10  side of the bent portion  38 . That is, the ends of the coil springs  40 , 41  are secured to the step portion  32  of the sliding block  4  and the end plane  10   a  of the connector  10 . Similarly to the embodiment shown in FIG. 2, the coil springs  40 , 41  may be fitted on the periphery of the bent portion  38 . Since the both end portions of the bent portion  38  are supported by the coil springs  40 , 41 , the bent portion  38  are kept in a U-shape against movement of the sliding block  4 , thereby getting similar effects as of the embodiment shown in FIG.  2 . 
     As shown in FIG. 4, the wiring harness  6  is of a tough-rubber sheath cable in the present embodiment. The tough-rubber sheath cable, as defined in C3327 of Japanese Industrial Standard for example, consists of a plurality of such electric wires as shown with  42 , 43 , an insulator  44  such as a foamed polyethylene filling the space, and a vinyl insulating sheath  45 . 
     Since the tough-rubber sheath cable enables the wiring harness  6  to have a completely circular cross-section, the wiring harness  6  should have a uniform bending property in all directions, thereby facilitating arranging work thereof from the guide roller  7  (FIG. 1) to the connector  10  through the sliding block  4 . This wiring harness  6  also has a good form-retaining property suitable for the bent portion  38 , and also facilitates end-treating work thereof such as cutting, peeling, and pressure-welding to a terminal. 
     As shown in FIG. 5, in a closed state of the sliding door  1  the sliding block  4  is pulled by the wire  26  of the reel  5  and is positioned at the rear end portion of the guide rail  3 . And, the door side wiring harness  6  raises forwardly aslant from the sliding block  4  and extends to the connector  31  by way of the guide roller  7 . The supporting axis  24  (FIG. 1) of the sliding block  4  is positioned at the rear end, or near thereof, of the slit  17  of the guide rail  3 . Since the sliding block  4  is pulled by the reel  5 , movement of the sliding block  4  is prevented during a run of the vehicle, thereby preventing the door side wiring harness  6  from swinging, slackening, wearing, making a noise, or the like caused by the slack. 
     As described above, the bent portion  38  (FIG. 1) of the wiring harness  6  extends from the sliding block  4  to the body side, which bent portion  38  is connected to the connector  10  mounted to the step portion  12  of the body  8 . In FIG. 5, reference numerals  46  and  47  indicate a window glass and an opening lever, respectively. 
     As shown in FIG. 6, since the bent portion  38  of the wiring harness  6  is connected to the body  8 , the sliding block  4  is positioned at the front end of the guide rail  3  in an opened state of the sliding door  1 . Actually, the sliding block  4  remains the same position as of closed state of the sliding door  1  in FIG. 5, while the sliding door  1  has shifted rearward. The wire  26  of the reel  5  is extended and pulls the sliding block  4  rearward and, however, the sliding block  4  remains still due to a suitable stiffness of the bent portion  38  of the wiring harness  6 . 
     As shown in FIG. 6, the reel  5  makes the sliding block  4  smoothly slide rearward on closing the sliding door  1  in an arrow D 1  direction. When the sliding door  1  is closed or opened, though the wiring harness  6  swings between the guide roller  7  and the sliding block  4 , the guide roller  7  supports the swinging wiring harness  6  naturally and a bending movement of the wiring harness  6  over the guide roller  7  can be smoothly done. Since the wiring harness  6  swings and slackens, a slackening absorption mechanism (not shown) to pull a swing portion  48  (FIG. 5) forward or rearward may be provided. 
     As shown in FIG. 7, the sliding door  1  is positioned, in the closed state thereof, with the outer surface thereof being in the same plane as of the body  8 . The hinge roller  14  at a lower end side of the sliding door  1  is positioned at the front end of a slant portion  15   a  of the rail  15 . The bent portion  38  of the door side wiring harness  6  (FIG. 1) is located at the rear end of the sliding door  1  in a substantially U-shape. 
     As shown in FIG. 8, on the way to the opened state of the sliding door  1 , the sliding door  1  projects outward due to the bent rail  15 . The sliding block  4  (FIG. 6) is also on the way on the guide rail  3  (FIG. 6) of the sliding door  1  and the bent portion  38  of the wiring harness  6  (FIG. 1) bends in a widely opened U-shape. The hinge roller  14  shifts from the slant portion  15   a  of the rail  15  to its straight portion  15   b.    
     As shown in FIG. 9, the sliding door  1  is positioned, in the opened state thereof, parallel to the outer surface of the body  8 , and the hinge roller  14  is positioned at a rear end side of the straight portion  15   b  of the rail  15 . The sliding block  4  (FIG. 6) is located at the front end side of the sliding door  1 , and the bent portion  38  of the wiring harness  6  (FIG. 1) is pulled rearward a little. 
     According to the present embodiment, since the bent portion  38  is formed on the door side wiring harness  6  (i.e. the tough-rubber sheath cable), the door side wiring harness  6  can smoothly respond to three-dimensional opening-closing movement of the sliding door  1 . And, since the structure of hanging the door side wiring harness  6  from the sliding door  1  and applying the sliding block  4  along with the reel  5  is simple, a required space in the door thickness direction can be small, thereby enabling the present structure to be applied to the sliding door  1  of a thin type. Also, since the tough-rubber sheath cable is used as the door side wiring harness  6 , arranging work and end-treating work thereof such as cutting, peeling, and pressure-welding to a terminal can be easy. 
     Further, since the door side wiring harness  6  is secured by the pressing plate  34  with use of the small screw  37  to the sliding block  4 , the wiring harness  6  can be attached or detached easily. And, since the bent portion  38  of the door side wiring harness  6  is bent in a U-shape between the sliding block  4  and the body side, a bending movement of the wiring harness  6  can be smoothly done when the sliding door  1  is opened or closed and simultaneously extension and shrinkage do not arise on the wiring harness  6 , thereby preventing damage of the wiring harness  6 . In particular, since the coil springs  39 - 41  are fitted on the bent portion  38 , the bent portion  38  can be protected and simultaneously form-retaining of the bent portion  38  can be done, whereby an absorbing effect for extension and shrinkage of the wiring harness  6  can be improved and also the sliding block  4  can be located at a predetermined position on the guide rail  3  of the sliding door  1  when the sliding door  1  is opened or closed, thereby preventing such unnecessary movement of the swing portion  48  of the wiring harness  6  as a flutter or the like. Besides, since the reel  5  restrains unnecessary movement of the sliding block  4  when the sliding door  1  is opened or closed, the sliding block  4  can be located at a predetermined position on the guide rail  3  during the opening or closing operation of the sliding door  1 , thereby bringing about the similar effects as described above. 
     Next, FIGS. 10-15 show a second embodiment of an electricity supplying structure (or mechanism) on motor vehicle sliding door in accordance with the present invention. 
     As shown in FIG. 10, an electricity supplying mechanism B on motor vehicle sliding door of the present embodiment does not have the reel  5  (FIG. 1) and is provided with a pair of linking arms  52 , 53  on a guide rail  51 . And, a door side wiring harness  54  is arranged along the linking arms  52 , 53 . 
     Similarly to the previous embodiment, the guide rail  51  is horizontally arranged at the lower portion of the inner panel  2  of the sliding door  1  and a slit  55  of the guide rail  51  is slidably engaged with a sliding block (i.e. a slider)  56 . The sliding block  56  is pivotally connected with one end portion of the first linking arm  52  by means of an axis portion  57  (FIG.  11 ). One end portion of the second linking arm  53  is pivotally connected to the front end of the guide rail  51  by means of an axis portion  58  (FIG.  11 ), and the other end portion of the first linking arm  52  and the other end portion of the second linking arm  53  is linked with a linking axis  59 . The linking arms  52 , 53  stand in a reversed-V state. The other structure is substantially the same as of the first embodiment. That is, the electricity supplying mechanism B on motor vehicle sliding door has the guide rail  51 , the sliding block  56 , and the linking arms  52 , 53 . 
     Similarly to the previous embodiment, the guide rail  51  is formed with the slit  55  in the vertical middle of a straight plate portion  60 , and the plate portion  60  is provided with secured portions  62 - 64  at the both ends and in the horizontal middle thereof. Each of the secured portions  62 - 64  is fixed to the inner panel  2  with a ring spacer  65  and a bolt  66 , which spacer  65  makes a gap  67  between the inner panel  2  and the guide rail  51 . 
     And, the slit  55  of the guide rail  51  is engaged with a supporting axis  68  of the sliding block  56 , that is, a flange portion  69  (FIG. 13) formed at the end of the supporting axis  68  is positioned in the gap  67  at the back of the guide rail  51 . The supporting axis  68  is provided with a bearing  70  (FIG. 13) on the periphery so that the sliding block  56  can smoothly move along the slit  55 . 
     And, the one end portion of the first linking arm  52  is connected to a front half portion (i.e. a thin portion)  72  of the sliding block  56  by means of an axis portion  71  (FIGS.  12 , 13 ) at the back of the guide rail  51 . The one end portion of the first linking arm  52  is located in the gap  67  and slides on the back of the guide rail  51  along with the sliding block  56 . 
     The other end portions of the respective first and second linking arms  52 , 53  lap each other and are linked with the axis portion  59 . One end portion of the second linking arm  53  is pivotally connected to the back of a secured portion  62  at an front end side of the guide rail  51  by means of an axis portion  73 . The one end portion of the second linking arm  53  is also located in the gap  67 . The link structure of the linking arms  52 , 53  will be described later. 
     In FIG. 10, the door side wiring harness  54  is arranged from the sliding block  56  along the first linking arm  52  and the second linking arm  53  substantially in a reversed-V state, is bent upward from a lower end side of the second linking arm  53  in a U-shape, and is connected to a wiring harness (not shown), by means of a connector, connected with auxiliary units installed inside the sliding door  1 . The wiring harness  54  is secured to the linking arms  52 , 53  by a securing means (not shown). The linking arms  52 , 53  are provided, for example, with pluralities of securing holes  74  for securing the wiring harness  54 . The wiring harness  54  has a little extra over the axis portion  59 . 
     On movement of the sliding block  56  the linking arms  52 , 53  with the wiring harness  54  are opened or closed. The linking arms  52 , 53  prevent the wiring harness  54  from hanging down and tangling. Also, the linking arms  52 , 53  work similarly to the reel S (FIG. 1) of the previous embodiment in terms of helping the movement of the sliding block  56 . 
     The linking arms  52 , 53  shall be arranged over the guide rail  51  and be in a reversed-V state, whereby the linking arms  52 , 53  are likely to open each other due to their own weight, thereby facilitating the sliding block  67  to move rearward. Force for moving the sliding block  56  rearward due to the weight of the linking arms  52 , 53  gradually increases as increasing angle of the linking arms  52 , 53 , and when the sliding door  1  is fully opened, the sliding block  56  can be securely shifted to the rear end side of the guide rail  51 . 
     As shown in FIG. 12, in a fully opened state of the sliding door  1  (FIG. 10) the linking arms  52 , 53  vertical stand as shown with a solid line, and in a fully closed state thereof the linking arms  52 , 53  open each other as shown with a chain line. If the linking arms  52 , 53  are arranged in a thoroughly horizontal line in the fully closed state of the sliding door  1 , the linking arms  52 , 53  do not return to the reversed-V state and this would lock the sliding door  1  (FIG.  10 ). Therefore, the linking arms  52 , 53  shall be bent a little in the fully closed state of the sliding door  1 . Since the linking arms  52 , 53  are pushing the sliding block  56  rearward in the fully closed state of the sliding door  1 , movement of the sliding block  56  is prevented during a run of the vehicle, thereby preventing the door side wiring harness  54  (FIG. 10) from slackening, wearing, making a noise, or the like caused by the slack. 
     When the linking arms  52 , 53  change from their closed state to their opened state, the axis portion  59  of the linking arms  52 , 53  moves in an arc. The opening-closing movement of the linking arms  52 , 53  is due to relative movement of the sliding block  56  against the guide rail  51  though the sliding block  56  remains almost still due to the bent portion  75  of the wiring harness  54  (FIG.  10 ). 
     As described above, one end portion of the first linking arm  52  is connected to the thin portion  72  of the sliding block  56  by means of the axis portion  71 , and one end portion of the second linking arm  53  is pivotally connected to the secured portion  62  at the front end side of the guide rail  51  by means of the axis portion  73 . The secured portion  62  projects above the slit  55 , and the axis portion  73  is positioned above the front end of the slit  55 . The axis portion  71  of the first linking arm  52  is put through the slit  55  and the second linking arm  52  is formed a little shorter than the first liking arm  52 , so that the first linking arm  52  is capable of easily opening or closing. The guide rail  51  is provided with bolting holes  76 - 78  on the secured portions  62 - 64 , respectively, which secured portion  64  is positioned between the secured portions  62 , 63 . 
     As shown in FIG. 13, there exists the gap  67  due to the spacer  65  between the guide rail  51  and the inner panel  2  of the sliding door  1 . In the gap  67  the end portions of the first linking arm  52  and the second linking arm  53  are located. The sliding block  56  slidably engages the slit  55  of the guide rail  51  by means of such a bolt as the supporting axis  68 . The supporting axis  68  is fitted with a bearing  70  so that the supporting axis  68  is capable of sliding smoothly in the slit  55 , and the supporting axis  68  is provided with a flange portion  69  at the end thereof so that axial movement of the supporting axis  68  is restricted. 
     And, the axis portion  71  is put through the thin portion  72  of the sliding block  56 , the slit  55  of the guide rail  51 , and one end portion of the first linking arm  52 , and the axis portion  71  is provided with flange portions  79 , 80  at the both ends thereof. The axis portion  71  is fitted with two bearings  81  for respective portions relative to the slit  55  and to the end portion of the first linking arm  52  so that the axis portion  71  is capable of sliding smoothly in the slit  55  and so that the first linking arm  52  is capable of smoothly pivoting on the axis portion  71 . The sliding block  56  slides stable in the slit  55  with the supporting axis  68  and the axis portion  71 . 
     And, the axis portion  59  is put through the other end portions of the respective first and second linking arms  52 , 53 , and the axis portion  59  is provided with flange portions  82 , 83  at the both ends thereof. The axis portion  59  is fitted with a bearing  84  so that the linking arms  52 , 53  are capable of smoothly pivoting on the axis portion  59 . 
     And, the one end portion of the second linking arm  53  is connected to the back of the secured portion  62  with a spacer  85 , and the axis portion  73 , i.e. a bolt, is put through the end portion and the spacer  85 . The axis portion  73  is fitted with a bearing  86  for respective portions relative to the slit  55  and to the end portion of the first linking arm  52  so that the axis portion  71  is capable of sliding smoothly in the slit  55  and so that the first linking arm  52  is capable of smoothly pivoting on the axis portion  71 . The sliding block  56  slides stable in the slit  55  with the supporting axis  68  and the axis portion  71 . The axis portion  73  is fitted with a bearing  86  so that the second linking arm  53  is capable of smoothly pivoting on the axis portion  73 . The axis portion  73  is screwed into the inner panel  2  through the flange portion  87 . 
     In FIG. 10, a lower portion of the wiring harness  54 , that is, a bent portion  75  formed in a substantially U-shape between the sliding block  56  to the body  8  side, bends forward and is connected to a connector  88  which is coupled with a mating connector  11  connected to the body side wiring harness  9  as an electricity supplying line. The body side wiring harness  9  extends forward to a battery side along an inside of a wall of the step  12 . 
     As shown in FIG. 14, the sliding block  56  is formed in rectangle and has a step portion  89  in the horizontal middle thereof. A bent portion  75  of the door side wiring harness  54  projects forward from the step portion  89  over the flange portion  80  of the axis portion  71  of the first linking arm  52  and bends substantially downward. Similarly to the previous embodiment, the rear half portion of the sliding block  56  is formed thick as a thick portion  90  to which a pressing plate  91  is secured for putting the wiring harness  54  therebetween. The pressing plate  91  is formed with an arched portion  92  bulging outward and bending by approximately 90 degrees, and the thick portion  90  is provided with a groove  93  relative to the arched portion  92 . And, the pressing plate  91  is secured to the thick portion  90  with small screws  94 , and the wiring harness  54  is put between the groove  93  and the arched portion  92 . 
     Also, similarly to the previous embodiment, a coil spring (i.e. a coil member)  95  is put around the bent portion  75  of the door side wiring harness  54 . The coil spring  95  protects the bent portion  75  against wear or the like, keeps the bent portion  75  in a smoothly bent shape, and prevents the bent portion  75  from being folded or from winding due to a movement of the sliding block  56  thereby to prevent a breakage of the bent portion  75 . Both ends of the coil spring  95  push the step portion  89  of the sliding block  56  and an end plane  88   a  of the connector  88 , respectively, due to its spring force without parting from the step portion  89  and the end plane  88   a.    
     As shown in FIG. 15, coil springs (i.e. as a coil member)  96 , 97  may partially be provided at a sliding block  56  side and a connector  88  side of the bent portion  75 . That is, the ends of the coil springs  96 , 97  are secured to the step portion  89  of the sliding block  56  and the end plane  88   a  of the connector  88 . Similarly to the embodiment shown in FIG. 14, the coil springs  96 , 97  may be fitted on the periphery of the bent portion  75 . Since the both end portions of the bent portion  75  are supported by the coil springs  96 , 97 , the bent portion  75  are kept in a U-shape against movement of the sliding block  56 . 
     Similarly to the previous embodiment (shown in FIG.  4 ), the wiring harness  54  is of a tough-rubber sheath cable. Since the tough-rubber sheath cable enables the wiring harness  54  to have a completely circular cross-section, the wiring harness  54  should have a uniform bending property in all directions, thereby facilitating arranging work thereof onto the linking arms  52 , 53  and continuously to the connector  88  through the sliding block  56 . This wiring harness  54  also has a good form-retaining property suitable for the bent portion  75 , and also facilitates end-treating work thereof such as cutting, peeling, and pressure-welding to a terminal. 
     Referring to FIG. 10, the connectors  88 , 11  of the door side and body side wiring harnesses  54 , 9  are fixed inside a vertical wall  13  of a step portion  12  of the body  8 . The sliding door  1  slidably engages a rail  15  (FIG. 7) provided on the body  8  by means of a hinge roller  14  at the lower end of the sliding door  1 . Similarly to the previous embodiment, since the bent portion  75  of the wiring harness  54  is connected to the body  8 , the sliding block  56  is positioned at the front end of the guide rail  51  in the opened state of the sliding door  1 . Actually, the sliding block  56  remains the same position as of closed state of the sliding door  1 , while the sliding door  1  has shifted rearward. 
     The action shown in FIGS. 7-9 in the first embodiment is applicable to the present embodiment by replacing a reference numeral  38  with a numeral  75 . That is, as shown in FIG. 7, the sliding door  1  is positioned, in the closed state thereof, with the outer surface thereof being in the same plane as of the body  8 . The hinge roller  14  at a lower end side of the sliding door  1  is positioned at the front end of a slant portion  15   a  of the rail  15 . The bent portion  75  of the door side wiring harness  54  (FIG. 10) is located at the rear end of the sliding door  1  in a substantially U-shape. 
     As shown in FIG. 8, on the way to the opened state of the sliding door  1 , the sliding door  1  projects outward due to the bent rail  15 . The sliding block  56  (FIG. 10) is also on the way on the guide rail  51  (FIG. 10) of the sliding door  1  and the bent portion  75  of the wiring harness  54  (FIG. 10) bends in a widely opened U-shape. The hinge roller  14  shifts from the slant portion  15   a  of the rail  15  to its straight portion  15   b.    
     As shown in FIG. 9, the sliding door  1  is positioned, in the opened state thereof, parallel to the outer surface of the body  8 , and the hinge roller  14  is positioned at a rear end side of the straight portion  15 b of the rail  15 . The sliding block  56  (FIG. 10) is located at the front end side of the sliding door  1 , and the bent portion  75  of the wiring harness  54  (FIG. 10) is pulled rearward a little. 
     According to the present embodiment, since the structure with the sliding block  56  and the linking arms  52 , 53  fitted with the wiring harness  54  is simple, a required space in the door thickness direction can be small, thereby enabling the present structure to be applied to the sliding door  1  of a thin type. And, since the wiring harness  54  is supported by a pair of linking arms  52 , 53 , the wiring harness  54  is prevented from hanging down and tangling when the sliding door  1  is opened or closed, thereby protecting the wiring harness  54  from wear due to contact and friction with the inner panel  2 . Also, since the sliding block  56  securely shifts to the predetermined position, when the sliding door  1  is closed, due to the weight of the linking arms  52 , 53 , the bent portion  75  of the wiring harness  54  can be prevented from being forcibly pulled, thereby also preventing the connector  88  from being forcibly pulled. 
     Further, similarly to the previous embodiment, since the bent portion  75  is formed on the door side wiring harness  54 , the door side wiring harness  54  can smoothly respond to three-dimensional opening-closing movement of the sliding door  1 , and since the tough-rubber sheath cable is used as the door side wiring harness  54 , arranging work and end-treating work thereof such as cutting, peeling, and pressure-welding to a terminal can be easy. 
     Still further, also similarly to the previous embodiment, the wiring harness  54  can be attached or detached easily by means of the pressing plate  91  of the sliding block  56 , a bending movement of the wiring harness  54  can be smoothly done and simultaneously extension and shrinkage do not arise on the wiring harness  54  by means of the bent portion  75 , and the bent portion  75  can be protected and simultaneously form-retaining of the bent portion  75  can be done by means of the coil springs  95 - 97 . 
     In the above embodiments, though the guide rail  3 , 51  with the sliding block  4 , 56  are provided on the sliding door  1 , a guide rail with a sliding block may be provided on the body side. 
     Although the present invention has been fully described by way of examples with reference to the accompanying drawings, it is to be noted that various changes and modifications will be apparent to those skilled in the art. Therefore, unless otherwise such changes and modifications depart from the scope of the present invention, they should be construed as being included therein.