Patent Publication Number: US-2020284283-A1

Title: Connecting device for cables

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application claims priority to Korean Patent Application No. 10-2019-0026696, filed Mar. 8, 2019, the entire contents of which is incorporated herein for all purposes by this reference. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     Disclosed herein relates to a connecting device. More specifically, the present invention relates to a connecting device for cables that is configured to connect the cables to each other. 
     Description of the Related Art 
     Unless otherwise indicated herein, contents described in any item of the this Related Art are not the prior art with respect to claims of the present application and the description in the item of the present Related Art is not necessarily admitted to be the prior art. 
     In recent years, by providing a function to fold seats to utilize space inside a vehicle, trunk space is expanded or space, which passengers may conveniently utilize for multiple purposes inside the vehicle, is provided. 
     In addition, the trunk space is increased due to a need for expanded space for camping or leisure equipment for passengers using the vehicle, and the space inside the vehicle is increased through seat folding. Further, sales volume of a type of the vehicle such as an SUV, which is superior in usage of space to a sedan, has increased. 
     Therefore, in order to expand the trunk space by conveniently folding the seats in a second or third row inside a vehicle, it is necessary to connect a cable extending from the folding unit of the seat and a switch portion disposed on a trunk side through a connecting device. 
     However, since a distance between the switch portion disposed on the trunk side and the seats in the second or third row is far, and a distance difference between the cable extending from the folding unit of the seat and the switch portion occurs depending on the type of the vehicle, there is a need for a connecting device that is capable of conveniently detaching from or attaching to a cable extending from the seat and elastically adjusts the length thereof. 
     In this regard, Korean Patent No. 10-1537975 discloses a binding structure of a release cable for a vehicle seat fixing element, and Korean Patent Application Publication No. 10-2016-0019620 discloses a cable connecting apparatus of a trunk lid latch for vehicles. 
     However, the structure of the existing cable connecting device does not disclose a structure for conveniently connecting the cables between the seats in the second or third row of the vehicle and switch portion of the trunk side disposed at a considerable distance from the seats. 
     The foregoing is intended merely to aid in the understanding of the background of the present invention, and is not intended to mean that the present invention falls within the purview of the related art that is already known to those skilled in the art. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made keeping in mind the above problems occurring in the related art, and the present invention is intended to provide a connecting device for cables, in which a connecting portion and a length adjusting portion for connecting the cables are provided to be separated from each other, and a cable of a seat side and the connecting portion are easily attached to and detached from each other. 
     In addition, the present invention is not limited to the technical problems as described above, and it is obvious that another technical task may be derived from the following description. 
     In order to achieve the above objective according to one aspect of the present invention, there is provided a connecting device for cables, the device connecting a first cable connected to a folding unit of a seat of a first direction side and a third cable connected to a switch portion at a second direction side opposite to the first direction and including: a connecting portion including a connecting unit provided therein to connect the first cable and one end of a second cable thereto and to be slidingly movable in the first or second direction; and a length adjusting portion provided on a second direction side of the connecting portion and configured to connect an opposite end of the second cable to the third cable to each other, wherein a latching-step provided on a connecting protrusion coupled to the first cable may be inserted into an inner side of the first direction side of the connecting unit and, after elastically deforming a latching-plate provided on an inner surface of the connecting unit, may be fixed to the latching-plate of being restored. 
     In addition, the connecting portion may further include a stopper provided to block a sliding movement of the connecting unit, by being inserted into space of the second direction side of the connecting unit when elastically moved by being pressed toward an inner side from an outer surface. 
     In addition, the latching-plate may be provided with a first inclined surface toward the first direction, the first, inclined surface having one end connected to the inner surface of the connecting unit and an opposite end obliquely extending toward both the inner side of the connecting unit and the second direction. 
     In addition, the latching-step may have one end configured to expand and extend toward the first direction from the outer side of the latching-step to provide a second inclined surface corresponding to the first inclined surface and an opposite end recessed toward an inner side from an outer side of the second inclined surface to provide a latching-surface toward the first direction, and when the second inclined surface moves toward the second direction and being moved by a predetermined distance while pushing out the first inclined surface, while elastically moving to an original position thereof, the opposite end of the latching-plate may be brought into close contact with the latching-surface. 
     In addition, the connecting portion may further include: a first casing having one end provided to surround the connecting unit and an opposite end provided to extend in a cylindrical shape toward the second direction; and second and third casings coupled to be slidingly movable with the first and second cables, respectively, and coupled to one end and an opposite end, respectively, of the first casing. 
     In addition, the length adjusting portion may include: moving unit coupled to the opposite end of the second cable and provided with an attaching unit at an outer side thereof; a fourth casing having one end including a part surrounding an outer surface of the moving unit and coupled to the moving unit in order to be slidingly movable therewith and an opposite end extending from the one end toward the second direction to be coupled to the third cable; and a hook blocking a sliding movement of the moving unit by being inserted between the fourth casing and the attaching unit so as to be coupled to both inner surfaces of the one end of the fourth casing and the attaching unit. 
     In addition, the length adjusting portion may further include a spring having one end coupled to the moving unit and an opposite end extending toward the second direction to be coupled to an inner surface of the opposite end of the fourth case. 
     According to one embodiment disclosed in the present specification, the connecting device for the cables is adjustable in length in a state of being connected to a switch portion used for folding a folding seat and has an advantage of being easily connected to the folding unit of the seat frame. 
     In addition, the connecting device for the cables is provided in a small cylindrical shape and has advantages such that the device is easy to install in a vehicle body frame, is easily moved for tension control of the cable, and is capable of quickly connecting to the cable of a seat frame side by a latching-step coupling method. 
     In addition, since effects of the present invention described above are naturally exerted by a configuration of described contents irrespective of whether or not an inventor recognizes the effects, the above-described effects are only some effects according to the contents described, and it should not be admitted that effects that an inventor comprehends or actually exist are all listed. 
     In addition, the effects of the present invention will be further understood by the entire description of the specification, and even if not described in explicit sentences, when there is an effect that those of ordinary skill in the art can recognize the effect through the present specification, such effect is to be seen as an effect described in this specification. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objectives, features, and other advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  shows a usage state diagram in a connecting device for cables according to an embodiment disclosed in the present specification; 
         FIG. 2  shows a perspective view of a connecting portion of  FIG. 1  and a sectional view taken along the line I-I′ of the perspective view; 
         FIG. 3  shows perspective views illustrating the connecting portion of  FIG. 1 ; 
         FIG. 4  shows a sectional view taken along the line of  FIG. 3 ; 
         FIG. 5  shows a sectional view taken along the line of  FIG. 3 ; 
         FIG. 6  shows perspective views illustrating a connector of a connecting unit provided in the connecting portion of  FIG. 1 ; 
         FIG. 7  shows perspective views illustrating a length adjusting portion of  FIG. 1 ; 
         FIG. 8  shows exploded perspective views illustrating a moving unit of the length adjusting portion of  FIG. 1 ; and 
         FIG. 9  shows sectional views each taken along the line IV-IV′ and V-V′ of  FIG. 7 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, with reference to the accompanying drawings, configuration, operation, and effect of connecting device for cables that is configured to connect the cables according to an exemplary embodiment will be examined. For reference, in the following drawings, each component is omitted or schematically illustrated for convenience and clarity, and the size of each component does not reflect the actual size. In addition, the same reference numerals throughout the specification refer to the same components, and reference numerals for the same components in the individual drawings will be omitted. 
       FIG. 1  shows a usage state diagram in a connecting device for cables according to an embodiment disclosed in the present specification. 
     As shown in  FIG. 1 , the connecting device  100  for the cables includes a second cable  20 , a connecting portion  200 , and a length adjusting portion  400 . 
     One end of the connecting device  100  for the cables is connected to a folding unit  1 , by being coupled to a seat frame  3  through a first cable  10 , to fold the seat frame  3  or to unfold the seat frame  3  for providing space where passengers may be seated. 
     An opposite end of the connecting device  100  for the cables is connected to a switch portion  2  through a third cable  30 , wherein the switch portion  2  is disposed on a trunk side of a vehicle and allows a third cable  30  connected thereto to be pulled toward a second direction  6  or to be pushed toward a first direction  5  opposite to the second direction  6 . 
     When a worker or a passenger who installs the connecting device  100  for the cables in the vehicle pulls the third cable toward the second direction  6  by operating the switch portion  2 , a part of the connecting device  100  for the cables moves in the direction  6 , thereby causing the folding unit  1  to operate by pulling the first cable  10  toward the second direction  6 . 
     In a state where the trunk space and space above the seat frame  3  are communicated with each other when the seat frame  3  is folded by operation of the folding unit  1 , in case that the folding unit  1  is configured to operate by driving of a motor, a worker or user may operate the switch portion  2  again to unfold the seat frame  3  upward, thereby providing a seating space in front of the seat frame  3 . 
     Accordingly, the worker or user may drive the switch portion  2  by a simple manipulation to move the third cable  30  connected to the first cable  10  toward the second direction  6  through the connecting device  100  for cables, thereby folding or unfolding the seat frame  3 . 
     In addition, since the connecting portion  200  and length adjusting portion  400  are provided on a third cable side by being separated from each other with the second cable  20  interposed therebetween, in a process of connecting the third cable  30  located on the trunk side and the length adjusting portion  400  to each other after working of connecting the connecting portion  200  to an end of the first cable  10 , the length of the connecting device  100  for the cables may be adjusted, thereby improving working convenience. 
     In addition, with an outer side of the connecting portion  200  being pressed in a process of being coupled to the end of the first cable  10 , the connecting portion  200  may restrict movement of a unit that is allowed to move in the first or second direction  5  or  6  inside the connecting portion  200 . Accordingly, the connecting portion  200  may have an advantage in that the unit of which movement is restricted is conveniently coupled to the connecting protrusion provided with a latching-step coupled to the end of the first cable  10 . 
     In the meantime,  FIG. 2  shows a perspective view of a connecting portion of  FIG. 1  and a sectional view taken along the line I-I′ of the perspective view,  FIG. 3  shows perspective views illustrating the connecting portion of  FIG. 1 ,  FIG. 4  shows a sectional view taken along the line II-If of  FIG. 3 ,  FIG. 5  shows a sectional view taken along the line of  FIG. 3 , and  FIG. 6  shows perspective views illustrating a connector of a connecting unit provided in the connecting portion of  FIG. 1 . 
     As shown in  FIGS. 2 to 6 , the connecting portion  200  includes a connecting protrusion  210 , a connecting unit  220 , a first casing  230 , a second casing  240 , and a third casing  260 . 
     One end of the connecting portion  200  is coupled to be detachable or attachable with the first cable  10  through the connecting protrusion  210  coupled to the end of the first cable  10 , and an opposite end of the connecting portion  200  extends toward the second direction  6  and is coupled to be detachable or attachable with the second cable  20 . 
     The connecting portion  200  is coupled to the connecting protrusion  210  in order to be slidingly movable toward the first or second direction  5  or  6  and with the protrusion  21  provided at one end of the second cable  20  in order to be slidingly movable in the first or second direction  5  or  6 . 
     The connecting protrusion  210  includes a latching-step  212 , wherein the latching-step  212  is provided with a second inclined surface  213  and a latching-surface  214 . 
     The connecting protrusion  210  is provided with the latching-step  212  at an outer side of one end thereof, and an opposite end of the connecting protrusion  210  is reducing and extending toward the first direction  5  in a step shape and is coupled to the first cable  10  in a shape surrounding the first cable  10 . 
     At one end corresponding to the outer surface of the second direction  6  of the latching-step  212 , the second inclined surface  213  expanding and extending toward the first direction  5  at the outside of the latching-step  212  is provided. In addition, at an opposite end of the latching-step  212 , a latching-surface  214  is provided, the latching-surface  214  being recessed toward the inner side corresponding to a center of the connecting protrusion  210  at the outside of the second inclined surface  213  and faces the first direction  5 . 
     With reference to  FIG. 4 , the first casing  230  includes latching-steps  232 ,  234 , and  235 , and stoppers  236  and  237 . 
     One end of the first casing  230  is provided in a cylindrical shape surrounding the connecting protrusion  210 , and an opposite end of the first casing  230  surrounds the connecting unit  220  disposed therein, extends toward the second direction  6  so as to surround the second cable  20 , and is coupled to be detachable or attachable with the third casing  260 . 
     A part of one end of the first casing  230  is inserted into the second casing  240 , whereby the one end of the first casing  230  is coupled to be detachable or attachable with the second casing  240 , and an opposite end of the first casing  230  is inserted into the inner side of the third casing  260 , thereby being coupled to be detachable or attachable with the third casing  260 . 
     In a state where the first to third casings  230 ,  240 , and  250  are each coupled to each corresponding adjacent casing, outer surfaces of the casings coupled to each other are coincided with each other and provided in a flat cylindrical shape. Accordingly, the space in the vehicle may be saved in a process of installing the coupled casings inside the vehicle. In addition, in a state where the coupled casings are installed inside the vehicle, sliding movement of the coupled casings may be smoothly performed, thereby having an advantage of conveniently installing the connecting device  100  for the cables. 
     The latching-step  232  is provided to protrude outward from the outer surface of the one end of the first casing  230  in a ring shape surrounding the outer surface of the one end of the first casing  230 . In addition, when the second casing  240  moves toward the direction  6 , the latching-step  232  is inserted into the coupling groove  242  provided on the inner surface of the second casing  240  while being elastically deformed, thereby being coupled to the second casing  240  by the latching-step. 
     Each of the latching-steps  234  and  235  is provided to protrude toward each of opposite sides from the outer surface of the opposite end of the first casing  230 , and an inclined surface of each of the latching-steps  234  and  235  is provided to extend toward the second direction  6  and the inner side of the first casing  230 . 
     Each of the latching-steps  234  and  235  is inserted into each of first and second holes  263  and  265  provided at each of latching-frames  262  and  264  provided at each of opposite sides of the third casing  260  by being inserted into an inner side positioned in the second direction  6  side of the third casing  260 , thereby being coupled to be detachable or attachable with the latching-frames  262  and  264 . 
     With reference to  FIG. 5 , one end of the stopper  236  is connected to the inner surface of the first casing  230  in the second direction  6  side of the outer side groove  236   a  that communicates the inner space and the outside of the first casing  230  with each other by penetrating through an upper part of the outer side of the first casing  230 , and an opposite end of the stopper  236  extends from the outer side groove  236   a  toward the first direction  5  and a part thereof is protruding upward. 
     When a worker or user pushes the opposite end of the stopper  236  toward the inner space of the first casing  230 , the opposite end of the stopper  236  moves to the inner side of the first casing  230 , and when the pressure applied to the stopper  236  is withdrawn, the opposite end of the stopper  236  moves to an original position thereof. 
     One end of the stopper  237  is connected to the inner surface of the first casing  230  in the second direction  6  side of the outer side groove  237   a  that communicates the inner space and the outside of the first casing  230  with each other by penetrating through a lower part of the outer side of the first casing  230 , and an opposite end of the stopper  237  extends from the outer side groove  237   a  toward the first direction  5  and a part thereof is protruding downward. 
     When a worker or user pushes the opposite end of the stopper  237  toward the inner space of the first casing  230 , the opposite end of the stopper  237  moves to the inner side of the first casing  230 , and when the pressure applied to the stopper  237  is withdrawn, the opposite end of the stopper  237  moves to an original position thereof. 
     With reference to  FIGS. 4 and 5 , one end of the second casing  240  is coupled to the first cable  10  in a shape surrounding an outer shell  11  covering the first cable  10 , and an opposite end of the second casing  240  expands toward the second direction  6  and extends in a cylindrical shape, wherein a first groove  241  recessed toward the first direction  5  is provided on the opposite end. 
     A connecting protrusion  210  is disposed on an inner surface corresponding to the inner side of the first groove  241  of the second casing  240  to be coupled to the first cable  10 . In addition, the connecting protrusion  210  is movable in the first or second direction  5  or  6  in a state of being coupled to the first cable  10  and may be detached from the first groove  241  by moving together with the first cable  10  in the second direction  6 . 
     That is, the outer shell  11  and the second casing  240  coupled to the outer shell  11  are provided to be slidingly movable toward the first or second direction  5  or  6  along the extending direction of the first cable  10 . 
     In addition, in the process of coupling the connecting protrusion  210  to the connecting unit  220  disposed inside the first casing  230 , the worker or user may move the second casing  240  and the outer shell  11  toward the first direction  5  to expose the connecting protrusion  210  to the outside and may conveniently couple the connecting protrusion  210  to the connecting unit  220  by moving toward the second direction  6 . 
     The outer surface of the second casing  240  surrounding the first cable  10  inclinedly expands toward the first cable  10  and the second direction  6  and provides a curved surface, thereby allowing the connecting portion  200  to be installed and conveniently moved in a narrow space of the vehicle. Accordingly, working convenience may be improved. 
     The third casing  260  includes the latching-frames  262  and  264 . 
     One end of the third casing  260  is coupled to the first casing  230  in a shape of latching-step while surrounding a part of the outer portion of the opposite end of the first casing  230 , and an opposite end of the third casing  260  is reduced toward the second direction  6  and extends by a predetermined distance. 
     The opposite end of the third casing  260  is coupled to the outer shell  22  surrounding the outer side of the second cable  20  at the second direction  6  side of the third casing  260  and may be slidingly movable along an extending direction of the second cable  20 . 
     The outer surface of the third casing  260  surrounding the second cable  20  inclinedly expands toward the second cable  20  and the first direction  5  and provides a curved surface, thereby allowing the connecting portion  200  to be installed and conveniently moved in a narrow space of the vehicle. Accordingly, working convenience may be improved. 
     With reference to  FIGS. 3 and 4 , one end of the latching-frame  262  is connected to one side rim of the third casing  260 , and an opposite end of the latching-frame  262  extends toward the first direction  5  in a plate shape whose cross section is curved in a semicircle shape toward one side. In addition, a rectangular first hole  263  penetrating the latching-frame  262  is provided in a center of the latching-frame  262 . 
     Similarly, one end of the latching-frame  264  is connected to an opposite side rim of the third casing  260 , and an opposite end of the latching-frame  264  extends toward the first direction  5  in a plate shape whose cross section is curved in a semicircle shape toward an opposite side. In addition, a rectangular second hole  265  penetrating the latching-frame  264  is provided in a center of the latching-frame  264 . 
     Therefore, when the third casing  260  moves toward the first direction  5 , the latching-steps  234  and  235  are each inserted into the first and second holes  263  and  265  each provided in the latching-frames  262  and  264 , and the third casing  260  is coupled to the first casing  230  by the latching-step. 
     In addition, in a state where each of the latching-steps  232 ,  234 , and  235  provided at one end and the opposite end of the first casing  230  is inserted correspondingly in each of the coupling groove  242 , the first hole  263 , and the second hole  265 , the outer surface of the opposite end of the second casing  240 , the outer surface of the first casing  230 , the outer surface of the latching-frames  262  and  264 , the outer surface of the latching-steps  234  and  235 , and the outer surface of the one end of third casing  260  are provided to be coincident with each other so that the outer surface of the connecting portion  200  is provided in a smooth cylindrical shape. 
     Since the connecting portion  200  is provided to have the outer surface in a smooth cylindrical shape, there is an advantage in that the working convenience is improved when the connecting portion  200  is installed by slidingly moved in a limited space inside the vehicle in the installation process. 
     With reference to  FIGS. 3 to 5 , the connecting unit  220  includes latching-plates  222 ,  223 , and  224  and a connector  226 . 
     One end of the connecting unit  220  is provided in a cylindrical shape having an inner space opened toward the first direction  5 . In addition, an opposite end of the connecting unit  220  extends by a predetermined distance toward the second direction  6 , thereby being coupled to a protrusion  21  provided at one end of the second cable  20  and is provided with an insertion groove  225  in a cylindrical shape opened to the first direction  5  and the top side. 
     The insertion groove  225  of the connecting unit  220  is provided to be communicated with an outside space corresponding to space above a center of the connecting unit  220  and is communicated with a cable hole  225   a  penetrating an upper part of the one end of the connecting unit  220 . Accordingly, the connecting protrusion  210  and the first cable  10  may be inserted into the inner side of the connecting unit  220  through the insertion groove  225  and the cable hole  225   a  at a position above the connecting unit  220 . 
     The connecting unit  220  is coupled to be slidingly movable toward the first or second direction  5  or  6  in the inner space of the first casing  230 . However, when the opposite end of each of the stoppers  236  and  237  moves to the inner space of the first casing  230 , the connecting unit  220  is brought into close contact with the opposite end of each of the stoppers  236  and  237  and the sliding movement thereof toward the second direction  6  is restricted. 
     When the opposite end of each of the stoppers  236  and  237  moves to an original position thereof, the connecting unit  220  may be slidingly moved toward the second direction  6  along the inner surface of each of the stoppers  236  and  237 . 
     In a state where the movement toward the second direction  6  of the connecting unit  220  is restricted because of the opposite end of each of the stoppers  236  and  237  being moved to the inner space of the first casing  230 , the connecting protrusion  210  is easily inserted into the insertion groove  225 . 
     In a process of inserting the connecting protrusion  210  into the insertion groove  225 , the latching-step  212  elastically deforms the latching-plates  222 ,  223 , and  224  provided on the inner surface of the connecting unit  220  and then moves by a predetermined distance. Thereafter, the latching-plates  222 ,  223 , and  224  being restored are brought into close contact with the latching-surface  214  to restrict the connecting protrusion  210  from moving in the first direction  5 . 
     Therefore, in a state where the movement of the connecting unit  220  is restricted because of the opposite end of each of the stoppers  236  and  237  being pressed, the worker or user may insert the connecting protrusion  210  into the insertion groove  225  and conveniently and firmly couple the protrusion  210  with the connecting unit  220 . 
     With reference to  FIG. 3 , one end of the latching-plate  222  is connected to an outer surface of the connecting unit  220  corresponding to the first direction  5  side of a flank surface hole  222   a  penetrating an upper part of one side of the connecting unit  220  in a rectangular shape. In addition, an opposite end of the latching-plate  222  obliquely extends toward both the inner side of the connecting unit  220  and the second direction  6  in a plate shape. 
     One end of the latching-plate  223  is connected to an inner surface of the connecting unit  220  corresponding to the first direction  5  side of a flank surface hole  222   a  penetrating an upper part of an opposite side of the connecting unit  220  in a rectangular shape. In addition, an opposite end of the latching-plate  223  obliquely extends toward both the inner side of the connecting unit  220  and the second direction  6  in a plate shape. 
     One end of the latching-plate  224  is connected to an inner surface of the connecting unit  220  corresponding to the first direction  5  side of a lower hole  224   a  penetrating a lower part of the connecting unit  220  in a rectangular shape. In addition, an opposite end of the latching-plate  224  obliquely extends toward both the inner side of the connecting unit  220  and the second direction  6  in a plate shape. 
     Therefore, with reference to  FIG. 5 , when the connecting protrusion  210  moves toward the second direction  6  and is inserted into the insertion groove  225 , the second inclined surface  213  of the latching-step  212  is brought into close contact with the inclined surface of the first direction  5  side of each of the latching-plates  222 ,  223 , and  224 , and elastically moves the opposite end of each of the latching-plates  222 ,  223 , and  224  toward the second direction  6 . 
     When the second inclined surface  213  of the latching-step  212  moves further by a predetermined distance in a state after elastically moving the inclined surface of the first direction  5  side of each of the latching-plates  222 ,  223 , and  224 , the opposite end of each of the latching-plates  222 ,  223 , and  224  is brought into close contact with the latching-surface  214  while moving to the original position thereof, and the connecting protrusion  210  is fastened to the connecting unit  220 . 
     On the other hand, after slidingly moving the second casing  240  toward the first direction  5  by separating the second casing  240  from the first casing  230  as a first process of separating the connecting protrusion  210  from the connecting unit  220 , the operator or user may move the connecting unit  220  to the outside of the first casing  230  by pulling the connecting protrusion  210  toward the first direction  5 . 
     In addition, in a state where the connecting unit  220  is detached from the first casing  230 , when the connecting protrusion  210  is moved upward after being moved toward the second direction  6  by a predetermined distance, the connecting protrusion  210  and the first cable  10  are separated from the connecting unit  220  through the insertion groove  225  and the cable hole  225   a.    
     With reference to  FIGS. 3 and 6 , the connector  226  includes latching-steps  227 ,  228 , and  229 . 
     One end of the connector  226  is provided to be detachable or attachable to the opposite end of the connecting unit  220  and is coupled to the protrusion  21  of the second cable  20  by being provided at the opposite end of the connecting unit  220 . 
     The one end of the connector  226  is provided in a cylindrical shape, and the opposite end of the connector  226  extends by a predetermined distance toward the second direction  6 , wherein a part of the outer surface of the opposite end expands and is connected to the outer surface of the connecting unit  220 . 
     The latching-step  227  is provided to inclinedly protrude toward one side from an upper part of the outer surface of the one side of the one end of the connector  226  and is inserted into and fastened to a side hole  227   a  penetrating through an outer surface of one side of the second direction  6  side of the connecting unit  220 . 
     The latching-step  228  is provided to inclinedly to protrude toward another side from an upper part of the outer surface of another side of the one end of the connector  226  and is inserted into and fastened to a side hole  226   a  penetrating through an outer surface of another side of the second direction  6  side of the connecting unit  220 . 
     The latching-step  229  is provided to inclinedly protrude toward a lower side from a lower part of the outer surface of the one end of the connector  226  and is inserted into and fastened to a side hole  229   a  penetrating through a lower outer surface of the second direction  6  of the connecting unit  220 . 
     Meantime,  FIG. 7  shows perspective views illustrating a length adjusting portion of  FIG. 1 ,  FIG. 8  shows exploded perspective views illustrating a moving unit of the length adjusting portion of  FIG. 1 , and  FIG. 9  shows sectional views each taken along the line IV-IV′ and V-V′ of  FIG. 7 . 
     As shown in  FIGS. 7 to 9 , the length adjusting portion  400  includes a moving unit  420 , a fourth casing  440 , and a hook  460 . 
     In a state of being separated from the connecting portion  200  with the second cable  20  interposed therebetween, one end of the length adjusting portion  400  is coupled to an opposite end of the second cable  20  so as to be slidingly movable toward the first or second direction  5  or  6 . 
     An opposite end of the length adjusting portion  400  extends by a predetermined distance toward the second direction  6 , thereby being coupled to the third cable  30  and may restrict the sliding movement of the second cable  20  through a hook  460  provided to be detachable or attachable. 
     The moving unit  420  includes an attaching unit  422 , a latching-step  424 , and elastic plates  426 ,  427 ,  428 , and  429 . 
     One end of the moving unit  420  is coupled to the opposite end of the second cable  20 , and an opposite end of the moving unit  420  extends in a cylindrical shape toward the second direction  6  and is provided to be slidingly movable toward the first or second direction  5  or  6  inside the length adjusting portion  400 . 
     The outer surface adjacent to the one end of the moving unit  420  is provided to extend outward to provide the latching-step  424 , and the outer surface of the central part of the moving unit  420  is provided with a threaded or ring-shaped protrusions surrounding the outer surface spaced apart from each other at uniform intervals along an extending direction of the moving unit  420 . 
     The opposite end of the moving unit  420  is provided with elastic plates  426 ,  427 ,  428 , and  429  in a state of being separated from each other, wherein each of the elastic plates extends in a plate shape toward the second direction  6  from a rim of the opposite end of the moving unit  420  and provided with a latching-step at an end thereof. 
     One end of each of the elastic plates  426 ,  427 ,  428 , and  429  is connected to the opposite end of the moving unit  420  to surround an inner space inside the mobile unit  420 , provided to be separated from each other with a predetermined space therebetween. In addition, an opposite end of each of the elastic plates  426 ,  427 ,  428 , and  429  extends in the plate form toward the second direction  6 . 
     A part of the opposite end of each of the elastic plates  426 ,  427 ,  428 , and  429  protrudes outward, thereby providing a latching-step providing an inclined surface extending toward both the second direction  6  and the inner side of the moving unit  420 . In addition, when inserted into a hole of the first direction  5  side of the fourth casing  440  to be described later, the inclined surface of each of the elastic plates is inserted into the fourth casing  440  while being elastically deformed. 
     One end of the fourth casing  440  is provided in a square plate shape having a hole provided at a center thereof, and an opposite end of the fourth casing  440  is provided in a plate shape such that each of parts of opposite flank surfaces of the fourth casing  440  extends toward the second direction  6  and then extends toward each other to be coupled to the third cable  30 . 
     Therefore, an inner space of the rectangular parallelepiped shape communicated with an outer space corresponding to the upper part and the lower part thereof is provided in the inside of the fourth casing  440 . In addition, the opposite end of the moving unit  420  is inserted into the inner space of the fourth casing  440  through the hole and coupled to the fourth casing  440  so as to be slidingly movable in the first or second directions  5  or  6 . 
     Each of mounting grooves  422   a  and  422   b  inclinedly recessed from each of opposite surfaces toward the inner upper portion of the fourth casing  440  is provided at an upper end of each of the opposite surfaces of one end of the fourth casing  440 . In addition, a part of each of outer portions of opposite bottom surfaces of the fourth casing  440  is recessed toward an upper side on a lower side of each of opposite flank surfaces of one end of the fourth casing  440  so that each of coupling grooves  423   a  and  423   b  in a rectangular parallelepiped shape is provided. 
     Specifically, when the moving unit  420  is inserted into the inner side of the fourth casing  440 , the inclined surface of the latching-step provided on the opposite end of each of the elastic plates  426 ,  427 ,  428 , and  429  is deformed inward while being brought into close contact with the inner surface of the fourth casing  440  located in the hole. In addition, when the moving unit  420  moves further toward the second direction  6 , the above-mentioned inclined surface of the latching-step moves to an original position thereof. 
     The outer surface on which the attaching unit  422  of the moving unit  420  is provided is slidingly movable toward the first or second direction  5  or  6  through the hole. In addition, when the latching-step  424  reaches the one end of the fourth casing  440 , the latching-step  424  is brought into close contact with the fourth casing  440  corresponding to a rim of the hole, thereby restricting the movement of the moving unit  420  toward the second direction  6 . 
     On the contrary, when the moving unit  420  moves in the first direction  5  by the vibration of the vehicle body or the external force, the latching-step of each of the elastic plates  426 ,  427 ,  428 , and  429  is brought into close contact with the inner surface of the one end of the fourth casing  440  corresponding to the rim of the hole, thereby preventing the moving unit  420  from being separated from the fourth casing  440 . 
     Therefore, when the hooks  460  are broken or not mounted, the latching-step of each of the elastic plates  426 ,  427 ,  428 , and  429  may prevent inoperability of the switch unit  2  from occurring due to detachment of the moving unit  420  from the fourth casing  440  or may prevent the moving unit  420  from being detached from the fourth casing  440 , thereby improving the working convenience. 
     In a state where the moving unit  420  is inserted into the fourth casing  440  through the hole, insertion spaces are provided between opposite inner surfaces of the fourth casing  440  and the attaching unit  442 . In addition, a part of the hook  460  is inserted into the insertion spaces and coupled to the attaching unit  422 . 
     The hook  460  includes a pressing unit  462  and fixing plates  464  and  466 . 
     The pressing unit  462  is divided into opposite sides of the hook  460  and extends from the center toward the lower side of the hook  460 , thereby being configured to be brought into close contact with the attaching unit  422  while surrounding a part of an upper side and opposite flank surfaces of the attaching unit  422  provided on the outer surface of the moving unit  420 . 
     The inner surface of the pressing unit  462  is provided with threads or protrusions that engage with the threads or protrusions that may be provided in the attaching unit  422 , whereby the inner surface of the pressing unit  462  is firmly coupled to the attaching unit  422  while being brought into close contact with the attaching unit  422 . In addition, when the hook  460  is moved toward the upper side, the attaching unit  422  and the pressing unit  462  may be conveniently detached. 
     Threads or protrusions are provided on the outer flank surfaces of the pressing unit  462 , thereby being engaged with the threads or protrusions provided on the opposite inner surfaces of the fourth casing  440  that are brought into close contact with the outer flank surfaces of the pressing unit  462 . In addition, when the hook  460  is moved toward the upper side, the pressing unit  462  is easily separated from the opposite inner surfaces of the fourth casing  440 . 
     The fixing plate  466  extends toward the lower side in a separated state at one side of the pressing unit  462 , and a part of the lower end of the fixing plate  466  protrudes toward an opposite side of the pressing unit  462 , thereby being inserted into and fixed to the coupling groove  423   a  in a state where the pressing unit  462  is coupled to the moving unit  420 . 
     The fixing plate  466  extends toward the lower side in a separated state at one side of the pressing unit  462 , and a part of the lower end of the fixing plate  466  protrudes toward an opposite side of the pressing unit  462 , thereby being inserted into and fixed to the coupling groove  423   a  in a state where the pressing unit  462  is coupled to the moving unit  420 . 
     A part of the lower outer surface of the fixing plate  466  is inclined toward a lower outer side to form a handle, and the user may conveniently separate the fixing plate  466  from the coupling groove  423   a  by pulling the handle to the outer side. 
     The fixing plate  464  extends toward the lower side in a separated state at an opposite side of the pressing unit  462 , and a part of the lower end of the fixing plate  464  protrudes toward the one side of the pressing unit  462 , thereby being inserted into and fixed to the coupling groove  423   b  in a state where the pressing unit  462  is coupled to the moving unit  420 . 
     A part of the lower outer surface of the fixing plate  464  is inclined toward a lower outer side to form a handle, and the user may conveniently separate the fixing plate  464  from the coupling groove  423   b  by pulling the handle to the outer side. 
     Therefore, when the hook  460  is coupled to the moving unit  420  and the fourth casing  440 , by the inner surfaces of the coupling grooves  423   a  and  423   b  located at the first direction  5  side of the fourth casing  440 , movement of the fixing plates  464  and  466  in the second direction  6  is restricted, and the movement of the moving unit  420  in the second direction  6  is also restricted. 
     In addition, when the hook  460  is coupled to the moving unit  420  and the fourth casing  440 , since the surface of the pressing unit  462  of the first direction  5  side of the hook  460  is brought into close contact with the inner surface of the one end of the fourth casing  440  corresponding to the rim of the hole of the fourth casing  440  in the insertion space, movement of the hook  460  toward the first direction  5  is restricted. 
     Meanwhile, when the fixing plates  464  and  466  move away from the coupling grooves  423   a  and  423   b , respectively, and move upward, the fixing plates  464  and  466  may be inserted into the mounting grooves  422   a  and  422   b , respectively. In this case, the hook  460  is temporarily fixed to the upper side of the one end of the fourth casing  440 , thereby being prevented from being lost. In addition, when the position of the second cable  20  is adjusted by the movement of the moving unit  420 , the position of the moving unit  420  may be fixed by quickly moving the hook  460  toward the lower side. 
     One end of a spring  470  is coupled to the outer shell  22  surrounding the second cable  20  inside the moving unit  420  through the opposite end of the moving unit  420 , and an opposite end of the spring  470  is coupled to the inner surface of the opposite end of the fourth casing  440  gone by the opposite end of the moving unit  420 . 
     The elastic force of the spring  470  is provided to pull the moving unit  420  coupled to the spring  470  toward the second direction  6 . When the connecting protrusion  210  is coupled to the connecting unit  220 , the elastic force of the spring  470  automatically pulls the second cable  20  toward the second direction  6 , thereby maintaining the tension of the first and second cables  10  and  20  connected to the spring  470 . 
     Although the exemplary embodiments of the present invention have been described above with reference to the accompanying drawings, the configuration described in the embodiments and drawings described herein is only one of the most preferred embodiments of the present invention and does not represent all of the technical idea of the present invention. Accordingly, it is to be understood that there may be various equivalents and variations in place at the time of the present application. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description. Furthermore, the meaning and scope of the claims and all changes or modifications derived from an equivalent concept thereof should be construed as being included in the scope of the present invention.