Patent Publication Number: US-7594283-B2

Title: Nozzle assembly for bidet

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a bidet, and more particularly, to a nozzle assembly for a bidet that can perform the washing operation by reciprocally operating different nozzles according to washing areas such as genital and anal areas. 
   2. Description of the Related Art 
   A bidet is generally installed on a seat of a toilet stool so that a person sits to wash his/her genital and anal areas using washing water sprayed from washing and bidet nozzles without using toilet paper. The bidet includes a washing nozzle for washing the anal area and a bidet nozzle for washing the genital area. 
   The washing and bidet nozzles are arranged side by side on an identical horizontal plane. Therefore, when a user pushes a wash button after stool, the bidet nozzle is projected forward to spray the washing water to the user&#39;s anal area. At this point, in order to accurately spray the washing water to the user&#39;s anal area, a nozzle cap rotates at a predetermined angle. When the washing operation is finished, the washing nozzle is returned to its initial position. 
   In addition, when the user pushes a bidet button, the bidet nozzle is projected forward and an angle of a nozzle cap is adjusted so that the washing water can be accurately sprayed on the genital area of the user. 
   A bidet having the washing and bidet nozzles arranged side by side on the identical horizontal plane is disclosed in Korean utility model No. 20-0262725 to the applicant of this invention. 
   In addition, the washing and bidet nozzles may be arranged side by side in a vertical direction. In this case, a volume occupied by the nozzles can be reduced as compared with a type where the washing and bidet nozzles are arranged side by side on the identical horizontal plane. An operation method of the nozzles arranged side by side in the vertical direction is disclosed in Korean utility Model No. 20-0243354. 
   Here, in the case of the nozzles arranged side by side on the identical plane, since the two nozzles are arranged on left and right sides, they cannot be located right under the genital and anal areas. That is, the nozzles are to be slightly deviated from a point located right under the genital and anal areas. 
   Accordingly, when the user pushes the washing or bidet button, the washing or bidet nozzle is projected forward, after which the nozzle cap on which an injection hole is formed rotates so that the injection hole is oriented to take good aim at the genital or anal area. Furthermore, even when the nozzle cap rotates by a predetermined angle, there may be frequent occasions that the injection hole cannot take good aim at the genital or anal area. As a result, the washing water may be sprayed to an undesired region of the user or to user&#39;s cloth, thereby making the user unpleasant. 
   In addition, in the case of the bidet where the nozzles are arranged side by side in a vertical direction, the nozzles are designed to be projected forward by water pressure. That is, when the user pushes the bidet or washing button after stool, a step motor rotates clockwise or counterclockwise. By the rotation of the step motor, a fluid passage adjust value rotates to allow the washing water to be introduced into a valve case. By pressure of the introduced washing water, the bidet or washing nozzle is advanced. 
   However, in this nozzle projecting method using the water pressure, the operation of the bidet or washing nozzle may not accurately realized when the pressure of the washing water introduced into the bidet is too low. That is, in order to allow the bidet and washing nozzle to be advanced to an accurate location, a water pressure higher than a predetermined level is required. However, the pressure of the washing water introduced into the bidet is lowered at a location where the water pressure is lower than the predetermined level. As a result, the bidet and washing nozzles cannot be fully advanced due to the low water pressure. As a result, the washing water is sprayed to an undesired portion of the user, thereby making the user unpleasant and deteriorating the washing efficiency. 
   SUMMARY OF THE INVENTION 
   Accordingly, the present invention is directed to a nozzle assembly for a bidet that substantially obviates one or more problems due to limitations and disadvantages of the related art. 
   An object of the present invention is to provide a nozzle assembly for a bidet, which can reduce a volume of the bidet by arranging bidet and washing nozzles side by side in a vertical direction and can accurately locate the bidet or washing nozzle to a desired location regardless of a pressure level of washing water introduced into the bidet by using a special nozzle operating device. 
   Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
   To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a nozzle assembly for a bidet, including: a washing nozzle; a bidet nozzle mounted under the washing nozzle; a driving motor driving the washing nozzle and/or the bidet nozzle; a gear train comprising a driving gear connected to the driving motor to transmit rotational force of the driving motor, a first nozzle gear reciprocating the washing nozzle by receiving the rotational force from the driving gear, and a second nozzle gear reciprocating the bidet nozzle by receiving the rotational force from the driving gear; and a nozzle case for receiving the washing and bidet nozzles and the gear train. 
   In another aspect of the present invention, there is provided a nozzle assembly for a bidet, including: washing and bidet nozzles that are arranged side by side in a vertical direction; rack wires connected to rear ends of the washing and bidet nozzles, respectively; a first nozzle gear having gear teeth engaged with the rack wire connected to the rear end of the washing nozzle; a second nozzle gear having gear teeth engaged with the rack wire connected to the rear end of the bidet nozzle; and a driving gear transmitting rotational force to the first nozzle gear and/or the second nozzle gear. 
   In a still another aspect of the present invention, there is provided a nozzle assembly for a bidet, including: a washing nozzle; a bidet nozzle mounted under the washing nozzle; a driving motor driving the washing nozzle and/or the bidet nozzle; a gear train comprising a driving gear connected to the driving motor to transmit rotational force of the driving motor, a driven gear engaged with the driving gear to receive the rotational force from the driving gear, a first nozzle gear integrally formed with the driven gear to reciprocate the washing nozzle, and a second nozzle gear reciprocating the bidet nozzle by receiving the rotational force from the driving gear; and a nozzle case for receiving the washing and bidet nozzles and the gear train. 
   In a still yet another aspect of the present invention, there is provided a nozzle assembly for a bidet, including: a washing nozzle on a side surface of which a washing key is projected; a bidet nozzle disposed under the washing nozzle, the bidet nozzle being provided at a side surface with a bidet key project; a driving gear connected to the driving motor to receive rotational force, the driving gear comprising an upper gear teeth-forming rib formed in a strip-shape disposed along a front frame and a lower gear teeth-forming rib formed in a strip-shape disposed along a front frame; a first nozzle gear reciprocating the bidet nozzle by receiving the rotational force from the driving gear; and a second nozzle gear reciprocating the washing nozzle by receiving the rotational force from the driving gear. 
   According to the present invention, since the bidet and washing nozzles are arranged side by side in a vertical direction, the volume of the bidet can be reduced. 
   Furthermore, since the bidet and washing nozzles are arranged side by side in a vertical direction, the washing and bidet nozzles can be accurately aligned with the anal and genital areas so that the washing water can be accurately sprayed to the anal and genital areas. 
   In addition, since the washing and bidet nozzle are designed to be advanced regardless of the water pressure, the operation reliability of the bidet can be improved. 
   It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings: 
       FIG. 1  is a perspective view of a bidet where a nozzle assembly of the present invention is applied; 
       FIG. 2  is a right perspective view of a nozzle assembly according to a first embodiment of the present invention; 
       FIG. 3  is a left perspective view of a nozzle assembly according to a first embodiment of the present invention; 
       FIG. 4  is a right perspective view of a nozzle assembly where a nozzle case is removed according to a first embodiment of the present invention; 
       FIG. 5  is a left perspective view of a nozzle assembly where a nozzle case is removed according to a first embodiment of the present invention; 
       FIG. 6  is an enlarge view of a gear unit of a nozzle assembly according to a first embodiment of the present invention; 
       FIG. 7  is a sectional view taken along line I-I′ of  FIG. 2 ; 
       FIG. 8  is a right side view of a nozzle assembly according to a second embodiment of the present invention; 
       FIG. 9  is a right side view of a gear train of a nozzle assembly according to a second embodiment of the present invention; 
       FIG. 10  is a front view of a driving gear of a nozzle assembly according to a second embodiment of the present invention; 
       FIG. 11  is a rear view of a driving gear depicted in  FIG. 10 ; 
       FIG. 12  is a right side view of a nozzle assembly according to a second embodiment of the present invention; 
       FIG. 13  is a left side view of a nozzle assembly according to a second embodiment of the present invention; 
       FIG. 14  is a view illustrate a state before washing and bidet nozzles of a nozzle assembly according to a second embodiment of the present invention are operated by being engaged with a driving gear; 
       FIG. 15  is a view illustrating a projecting process of a bidet nozzle of a nozzle assembly according to a second embodiment of the present invention; 
       FIG. 16  is a view illustrating a state of a washing nozzle when a bidet nozzle is projected; 
       FIG. 17  is a view illustrating a projecting process of a washing nozzle of a nozzle assembly according to a second embodiment of the present invention; and 
       FIG. 18  is a view illustrating a state of a bidet nozzle when a washing nozzle is projected. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. 
     FIG. 1  shows a perspective view of a bidet where a nozzle assembly of the present invention can be employed. 
   Referring to  FIG. 1 , a bidet  100  employing the inventive nozzle assembly  200  includes a seat  110 , a cover  120  opening and closing an opening formed on a center of the seat  110 , and a component housing chamber  130  on which the seat  110  and the cover  120  are mounted and in which electric components are installed. That is, a nozzle assembly  200  for spraying washing water and a driving motor  300  for reciprocating nozzles of the nozzle assembly  200  are installed in the component-housing chamber  130 . A reversible motor may be used as the driving motor  300 . A synchronous motor, a direct current (DC) motor, a servo motor, and the like may be also used as the driving motor  300 . 
   The bidet  100  further includes a fluid control valve  160  for dispensing the washing water to one of bidet and washing nozzles of the nozzle assembly  200  and an air pump  150  connected to the fluid control valve  160  to inject air into the fluid control valve  160 . 
   The bidet  100  further includes a control panel  140  on which operational buttons controlling the operation of the bidet  100  are mounted. 
   The operation of the bidet  100  will be described hereinafter. 
   First, a user lifts the cover  120  upward and takes the seat  110 . After stool, when the user pushes a washing button, the washing nozzle is advanced from the nozzle assembly  200  and washing water is sprayed from an injection hole formed on a tip of the washing nozzle. When the washing operation is finished, the washing nozzle is returned to its initial position. 
   Meanwhile, when the user pushes a bidet button, the bidet nozzle is advanced from the nozzle assembly  200  and washing water is sprayed from an injection hole formed on a tip of the bidet nozzle. When the washing is finished, the bidet nozzle is returned to its initial position. 
     FIG. 2  shows a right perspective view of a nozzle assembly according to a first embodiment of the present invention. 
   Referring to  FIG. 2 , the inventive nozzle assembly  200  includes a washing nozzle  210  for washing an anal area of the user, a bidet nozzle  220  for washing an genital area of the user, and a nozzle case  230  receiving the washing and bidet nozzles  210  and  220 . The bidet nozzle  220  is disposed under the washing nozzle  210 . 
   The nozzle assembly  200  further includes a driving gear  240  connected to the driving motor  300 , a connecting gear  250  engaged with the driving gear  240 , and a driven gear  260  engaged with the connecting gear  250  to receive rotational force from the driving gear  240 . The driving gear  240  is provided with a penetrating hole  241  in which a rotational shaft of the driving motor  300  is inserted. The driving gear  240  will be described in more detail later. 
   The nozzle assembly  200  further includes a first nozzle gear  270  integrally mounted on a lower portion of the driven gear and engaged with an upper rack wire  214  reciprocating the washing nozzle  210  and a transmission gear  280  engaged with the driving gear  240 . The nozzle gear  270  is disposed facing the transmission gear  280 . However, the nozzle gear  270  may be axially coupled to the transmission gear  280  so that they can rotate together. 
   The washing nozzle  210  is provided at a rear-top with a rack wire-coupling end  213 . The upper rack wire  214  is provided at an end with an upper rack wire head  215 . The upper rack wire head  215  is coupled to the rack wire-coupling end  213  so that the washing nozzle can reciprocate by the movement of the upper rack wire  214 . 
   The nozzle case  230  is provided at an upper portion with a rack wire-coupling end guide groove  234  for guiding the reciprocating motion of the rack wire-coupling end  213 . A rear-lower portion of the nozzle case  230  is rounded. A upper rack wire guide groove  236  having a predetermined depth and width is formed along a frame defining the rear wall and rear-bottom of the nozzle case  230 . The upper rack wire  214  is located in the upper rack wire guide groove  236 . As the first nozzle gear  270  rotates, the upper rack wire  214  reciprocates along the upper rack wire guide groove  236 . 
   The nozzle case  230  is further provided at a lower end with a rack wire-coupling end guide groove  235  functioning as a passage of a reciprocation motion of a lower rack wire heat that will be described later. The nozzle case  230  is further provided at a front end with a washing water introducing tube  231  for introducing washing water for washing the washing and bidet nozzles  210  and  220 . 
     FIG. 3  shows a left perspective view of the nozzle assembly. 
   Referring to  FIG. 3 , the nozzle assembly further includes a second nozzle gear  290  integrally formed on an opposite side of the transmission gear  280  or axially coupled to the transmission gear  280  and a lower rack wire  224  engaged with the second nozzle gear  290 . The lower rack wire  224  reciprocates as the second nozzle gear  290  rotates. 
   There is provided a lower rack wire guide groove  237  for guiding the reciprocation motion of the lower rack wire  224 . The lower rack guide groove  237  having a predetermined width and depth is formed on an opposite side of the upper rack wire guide groove  236 . That is, the lower rack guide groove  237  is formed along a rounded frame of the rear lower end of the nozzle case  230 . 
   Meanwhile, as shown in the drawing, hose connection tubes  216  and  226  are respectively formed on rear portions of the washing and bidet nozzles  210  and  220 . The hose connection tubes are connected to the fluid passage control valve  160  so that the washing water can be selectively supplied to one of the washing and bidet nozzles  210  and  220 . 
   The operation of the nozzle assembly will be briefly described hereinafter with reference to  FIGS. 2 and 3 . 
   When the driving gear  240  connected to the driving motor  300  rotates, the connection gear  250  or the transmission gear  280  rotates. That is, when the connection gear  250  rotates in a state where it is engaged with the driving gear  240 , the washing nozzle  210  reciprocates. When the transmission gear  280  rotates in a state where it is engaged with the driving gear  240 , the bidet nozzle reciprocates. 
   When the washing or bidet nozzle  210  or  220  is returned to its initial position after the washing operation is finished, a forced washing operation is performed. For example, after the washing nozzle  210  is advanced and the washing operation for the user&#39;s anal area is finished, the washing nozzle  210  is returned into the nozzle case  230 . Then, the washing nozzle  210  is forcibly washed by the washing water introduced through the washing water introducing tube  231 . This operation is controlled by a microcomputer (not shown). 
     FIGS. 4 and 5  show respectively right and left perspective views of the nozzle assembly where the nozzle case is removed according to a first embodiment of the present invention; 
   Referring to  FIGS. 4 and 5 , as described above, the nozzle assembly  200  includes the washing and bidet nozzles  210  that are arranged side by side in the vertical direction. 
   A nozzle cap  211  provided with an injection hole  212  injecting the washing water is mounted on a front end of the washing nozzle  210 . Likewise, a nozzle cap  211  provided with an injection hole  222  is mounted on a front end of the bidet nozzle  220 . 
   In addition, the washing nozzle  210  is provided at a rear end with the rack wire-coupling end  213 . The rack wire-coupling end is provided at a middle of a side portion with a notch having a predetermined depth and width, thereby providing projections. The upper rack wire head  215  formed on the end of the upper rack wire  214  is coupled to the rack wire-coupling end  213 . That is, the upper rack wire head  215  is also provided at a middle of a side portion with a notch having a predetermined width and depth, thereby providing projections. Therefore, the projections and grooves of the upper rack wire head  215  and the rack wire-coupling ends  213  are engaged with each other. The rack wire  214  is a linear gear extending from the upper rack wire head  215  and provided at an inner circumference with gear teeth engaged with gear teeth of the first nozzle gear  270 . 
   The rack wire-coupling end is formed on a rear-bottom of the bidet nozzle gear  220 . Here, it is preferable that the rack wire-coupling ends  213  and  223  are integrally formed with the nozzles  210  and  220 , respectively, through an injection molding process. 
   Meanwhile, the rack wire-coupling end  223  is inserted into a groove formed on a top of the lower rack wire head  225 . The lower rack wire  224  is provided at an inner circumference with gear teeth engaged with outer gear teeth of the second nozzle gear  290 . 
     FIG. 6  shows an enlarge view of a gear unit of a nozzle assembly according to a first embodiment of the present invention. 
   Referring to  FIG. 6 , the bidet nozzle is designed to reciprocate by the rotation of gear connected to the driving motor  300 . 
   The driving gear  240  axially connected to the driving motor  300  is provided at a center with the penetrating hole  241  in which the rotational shaft of the driving motor  300  is inserted. The driving gear  240  is divided into upper and lower halves. The upper half is provided with upper gear teeth  242  and the lower half is provided with lower gear teeth  243 . 
   The upper and lower gear teeth  242  and  243  are partly formed on an outer circumference of the driving gear  240 . A start point  244  of the upper gear teeth  242  is distant from a star point  246  of the lower gear teeth  243  by a predetermined distance C. A length (a) from the start point  244  to an ending point  245  of the upper gear teeth  242  is almost identical to a length of the lower gear teeth  243 . 
   The upper gear teeth  242  are engaged with gear teeth of the connection gear  250  and the lower gear teeth  243  are engaged with gear teeth of the transmission gear  280 . While the upper gear teeth  242  rotates in a state where they are engaged with the gear teeth of the connection gear  250 , the transmission gear  280  is disengaged from the lower gear  243 . Accordingly, the transmission gear  280  is not rotated. 
   On the contrary, while the transmission gear  280  rotates in a state where it is engaged with the lower gear teeth  243 , the connection gear  250  is not rotated. 
   The operation of the connection gear  250  according to the rotation of the gears will be described hereinafter. 
   When the user pushes the washing button, the driving motor  300  rotates counterclockwise, thereby rotating the driving gear  240  counterclockwise. When the driving gear  240  rotates, the upper gear teeth  242  are engaged with the connection gear  250 . That is, gear teeth formed on the start point  244  of the upper gear teeth  242  are engaged with the gear teeth of the connection gear  250  to rotate the connection gear  250 . 
   Meanwhile, the connection gear  250  rotates clockwise and the driven gear  260  engaged with the connection gear  250  rotates counterclockwise. The first nozzle gear  270  integrally connected to a lower end of the driven gear  260  rotates counterclockwise. As the first nozzle gear  270  rotates counterclockwise, the upper rack wire  214  engaged with the first nozzle gear  270  is advanced. As a result, the washing nozzle  210  is projected forward. 
   At this point, the gears are designed such that the washing nozzle  210  can be maxim ally projected the moment the ending point  245  of the upper gear teeth is engaged with the gear teeth of the connection gear  250  or the moment the ending point  245  of the upper gear teeth is disengaged from the gear teeth of the connection gear  250 . 
   Meanwhile, in a state where the projection of the washing nozzle  210  is maxim ally projected, the washing water is sprayed through the injection hole  212 . After the washing operation is finished, the driving more  300  rotates in a reverse direction. 
   As the driving motor  300  rotates in the reverse direction, the driving gear  240  rotates clockwise until the start point  244  of the upper gear teeth is disengaged from the gear tooth of the connection gear  250 , thereby returning the washing nozzle  210  to the initial position. 
   Here,  FIG. 6  shows gear teeth when the washing nozzle  210  is completely inserted into the nozzle case  230 . According to features of the upper and lower gear teeth  242  and  243 , the moment the start portion of the upper gear teeth  242  is disengaged from the connection gear  250 , the start point  246  of the lower gear teeth  243  starts engaging the gear teeth of the transmission gear  280 . 
   Describing in more detail, in a state where the washing nozzle  210  is completely returned to the initial position, when the driving gear  240  starts rotating clockwise, the lower gear teeth  243  are engaged with the gear teeth of the transmission gear  280 . The transmission gear  280  rotates counterclockwise and the second nozzle gear  290  integrally connected on the opposite side of the transmission gear  280  rotates counterclockwise. The lower rack wire  224  engaged with the gear teeth of the second nozzle gear  290  is advanced forward along the lower rack wire guide groove  237 . As a result, the bidet nozzle  220  having a bottom connected to the lower rack wire  224  is advanced forward. The transmission gear  280  rotates until the moment the ending point (not shown) of the lower gear teeth is engaged with or disengaged from the gear tooth of the transmission gear  280 . 
   Here, while the transmission gear  280  rotates, the connection gear  250  is not rotated. 
     FIG. 7  shows a sectional view taken along line I-I′ of  FIG. 2 . 
   Referring to  FIG. 7 , as described above, the nozzle assembly  200  of the present invention includes the nozzle case  230 , the washing and bidet nozzles  210  and  220  received in the nozzle case  230 , and side covers  232  sealing the both sides of the nozzle case  230 . The nozzle case  230  and the side covers  232  are coupled to each other by a plurality of fastening members such as bolts or screws. 
   The washing water introducing tube  231  is formed penetrating the side cover  232 . The washing water introducing tube  231  communicates with a washing water chamber  233  formed on an inner front portion of the nozzle case  230 . In order to allow the washing water introduced into the washing water chamber  233  through the washing water introducing tube  231  to wash the nozzle cap  211  of the washing nozzle  210 , there is provided an upper fluid passage  238  communicating with the washing nozzle  210 . In order to allow the washing water introduced into the washing water chamber  233  through the washing water introducing tube  231  to wash the nozzle cap  221  of the bidet nozzle  220 , there is provided a lower fluid passage  239  communicating with bidet nozzle  210 . 
   Generally, the forced washing process for the nozzle caps is performed before one of the washing and bidet nozzles is operated after the other of the washing and bidet nozzles is operated. Accordingly, when one the washing and bidet nozzles is returned after being operated, the washing water is introduced into the washing chamber  233  through the washing water introducing tube  231  and directed along one of the upper and lower fluid passages  238  and  239  to wash one of the washing and bidet nozzles  210  and  220 . 
     FIG. 8  shows a right side view of a nozzle assembly according to a second embodiment of the present invention and  FIG. 9  shows a right side view of a gear train of a nozzle assembly according to a second embodiment of the present invention. 
   Referring first to  FIG. 8 , in this embodiment, the connection gear  250  connecting the driving gear  240  to the driven gear  260  is omitted and a position sensor detecting a position of the driving gear  240  is further provided. 
   That is, according to a feature of a nozzle assembly of this embodiment, a structure for preventing the washing and bidet nozzles  210  and  220  from being simultaneously projected forward. This will be described later. 
   The components identical to those described in the first embodiment will not be described in this embodiment. 
   A nozzle assembly of this embodiment includes a nozzle case  230 , nozzle case cover  238  attached on both sides of the nozzle case  230 , and a position sensor  500  disposed on an outer surface of the nozzle case cover  230  to detect the position of the driving gear  240 . 
   A magnet  400  is attached on an outer circumference of the driving gear  240  to allow the position sensor  500  to detect the position of the driving gear  240 . As shown in the drawing, the position sensor  50  is installed close to the magnet  400  so that it can accurately detect the position of the magnet  400  when the driving gear  240  rotates. The position detecting means of the driving gear  240  is not limited to the position sensor  500  and the magnet  400 . A variety of means can be used to detect the position of the driving gear  240 . 
   Referring to  FIG. 9 , the gear train of the nozzle assembly of this embodiment includes the driving gear  240  axially connected to the driving motor  300 , a driven gear  260  engaged with the driving gear  240 , a first nozzle gear  270  integrally formed on a lower portion of the driven gear  260 , a transmission gear engaged with the driving gear  240 , and a second nozzle gear  290  integrally formed on a rear surface of the transmission gear  280 . 
   According to another feature of this embodiment, rotational force of the driving gear  240  is directly transmitted to the driven gear  260  without passing through the connection gear  250 . As a result, the rotational direction of the driven gear  260  is opposite to that of the driving gear  240 . 
     FIGS. 10 and 11  show front and rear views of the driving gear of the nozzle assembly according to a second embodiment of the present invention, respectively. 
   Referring to  FIGS. 10 and 11 , the magnet  400  having a predetermined size is mounted on a front frame of the driving gear  240  so that the position sensor  500  can detect the position of the driving gear  240 . 
   The driving gear  240  is provided an upper gear teeth-forming rib  247  for forming gear teeth  242  on the front frame and a lower gear teeth-forming rib  248  for forming gear teeth  243  on a rear frame. 
   A key groove  249   a  having a predetermined width is formed inside the lower gear teeth-forming rib  240 . The lower gear teeth-forming rib  240  is not formed in an endless circle, having spaced first and second ends. A space defined between the first and second ends of the lower gear teeth-forming rib  240  functions as a withdraw opening  249  through which a washing or bidet key that will be described later will be withdrawn. 
   Describing in more detail with reference to  FIG. 9 , the upper gear teeth  242  are partly formed on a lower portion of the upper gear teeth-forming rib  247  while the lower gear teeth  243  are partly formed on an upper portion of the upper gear teeth-forming rib  248 . The upper gear teeth  242  are engaged with the gear teeth of the driven gear  260  and the lower gear teeth  243  are engaged with the gear teeth of the transmission gear  280 . As a result, in a state where the washing and bidet nozzles  210  and  220  are inserted into the nozzle case  230 , when the driving gear  240  rotates counterclockwise, the driven gear  260  rotates clockwise. The first nozzle gear  270  integrally connected to the lower portion of the driven gear  260  rotates clockwise, thereby moving the upper rack wire  214  wound around the frame of the first nozzle gear  270  to allow the bidet nozzle  220  to be advanced forward. 
   Meanwhile, when the driving gear  240  rotates clockwise, the transmission and second nozzle gears  280  and  290  rotate counterclockwise. The lower rack wire  224  wound around the second nozzle gear  290  rotates to allow the washing nozzle  210  to be advanced forward. 
   The advancing of the nozzles according to the rotation of the driving gear  240  will be described more in detail hereinafter. 
     FIG. 12  shows a right side view of a nozzle assembly according to a second embodiment of the present invention and  FIG. 13  shows a left side view of a nozzle assembly according to a second embodiment of the present invention. 
   Referring first to  FIG. 12 , as described above, the gear train and rack wire guide structure of the nozzle assembly of this embodiment are different from those of the first embodiment. 
   According to the nozzle assembly of this embodiment, the upper rack wire  214  wound around the outer circumference of the first nozzle gear  270  is connected to the bidet nozzle  220 . That is, a rack wire-coupling end  223  formed on a portion of the outer circumference of the bidet nozzle  220  is coupled to an upper rack wire head  215  formed on a lower end of the upper nozzle. 
   The upper end of the upper rack wire  214  reciprocates in an upper rack wire guide groove  236  formed on an upper portion of an insertion portion in which the washing nozzle  210  is inserted. The lower end of the upper rack wire  214  reciprocates in a lower rack wire guide groove  234  formed on a lower portion of the insertion portion in which the bidet nozzle  220  is inserted. 
   The washing key guide groove  235  having a predetermine length is formed on a middle portion of the nozzle case  230  between the bidet nozzle  220  and the washing nozzle  210 . The washing key  217  reciprocates in the washing key guide groove  235 . 
   In addition, another rack wire-coupling end guide groove  234  is further formed on the nozzle case  230  under the washing key guide groove  235  so that the rack wire-coupling key  217  formed on a side surface of the bidet nozzle  220  can reciprocate in the rack wire-coupling end guide groove  234 . 
   Describing in more detail, the washing nozzle  210  is provided at an upper-outer circumference with the rack wire-coupling end  213  and at a side surface with the washing key  217  while the bidet nozzle  220  mounted under the washing nozzle  210  is provided with a bidet key  227  integrally extending from a top of the rack wire-coupling end  223 . 
   Referring to  FIG. 13 , the lower rack wire is wound around the outer circumference of the second nozzle gear  290 . The lower rack wire guide groove  237  guiding the movement of the lower rack wire  224  is formed on a left side of the nozzle case  230 . That is, the lower rack wire guide groove  237  extends from the upper end of the nozzle case  230  along the frame of the nozzle case  230 . The lower rack wire  224  inserted in the lower rack wire guide groove  237  is provided at an upper end with the lower rack wire head  225 . The lower rack wire head  225  is coupled to the rack wire-coupling end  213  formed on the top of the washing nozzle  210 . Accordingly, the washing nozzle  210  is advanced or inserted according to the rotational direction of the second nozzle gear  290 . The washing key  217  reciprocating along the washing key guide groove  235  is formed to cross the rack wire-coupling end  213  at right angles. 
     FIG. 14  illustrates a state before the washing and bidet nozzles of the nozzle assembly according to a second embodiment of the present invention are operated by being engaged with the driving gear. 
   Referring to  FIG. 14 , the washing key  217  formed on the outer circumference of the washing nozzle  210  and the bidet key  227  formed on the outer circumference of the bidet nozzle  220  are inserted in a key groove formed on the rear surface of the driving gear  240 . The keys  217  and  227  are advanced or inserted through the key withdraw opening  249  defined between the opposite ends of the upper gear teeth-forming rib  240 . When one of the washing and bidet keys  217  and  227  is advanced through the key withdraw opening  249 , the other is fixed by being hooked on an inner circumference of the lower gear teeth-forming rib  248 . 
   Accordingly, even when a washing water supply hose connected, to the nozzles  210  and  220  twines, the advancement of one of the nozzles is not affected by the other. This will be described in more detail hereinafter. 
     FIG. 15  illustrates an advancing process of the bidet nozzle of the nozzle assembly according to a second embodiment of the present invention and  FIG. 16  illustrates a state of the washing nozzle when the bidet nozzle is projected. 
   Referring to  FIGS. 15 and 16 , when the first nozzle gear  270  rotates clockwise, the lower end of the upper rack wire  214  is advanced forward the nozzle case  230 , thereby allowing the bidet nozzle  220  to be advanced forward. 
   Describing in more detail, when the driving gear  240  connected to the driving motor  300  rotates counterclockwise, the connection gear  260  rotates clockwise. The first nozzle gear  270  integrally formed with the connection gear  260  rotates clockwise. By the clockwise rotation of the first nozzle gear  270 , the upper rack wire  214  moves. The bidet key  227  formed on the side surface of the bidet nozzle  220  is advanced forward through the key withdraw opening  290  formed on the rear surface of the driving gear  240 . 
   At this point, as shown in  FIG. 16 , the washing key  217  formed on the side surface of the washing nozzle  210  is hooked on the inner circumference of the lower gear teeth-forming rib  248 . Accordingly, when the driving gear  240  in a neutral state rotates in an arrow direction, the washing key  217  is caught on the key groove  249   a.    
   Accordingly, the washing nozzle  210  is not affected by the advancing of the bidet nozzle  220  but maintained in its insertion state. 
     FIG. 17  illustrates a projecting process of the washing nozzle of the nozzle assembly according to a second embodiment of the present invention and  FIG. 16  illustrates a state of the bidet nozzle when the washing nozzle is advanced. 
   Referring to  FIGS. 17 and 18 , when the driving gear  240  rotates clockwise, the transmission gear  280  engaged with the driving gear  240  rotates counterclockwise and the second nozzle gear integrally formed with the transmission gear  280  rotates counterclockwise, thereby moving the lower rack wire  224  wound around the outer circumference of the second nozzle gear  290 . 
   Since the lower rack wire head  225  formed on the upper end of the lower rack wire  224  is coupled to the rack wire-coupling end  213  formed on the top of the washing nozzle  210 , the upper end of the lower rack wire  224  is advanced forward to allow the washing nozzle  210  to be advanced forward. 
   The washing key  217  formed on the side surface of the washing nozzle  210  is advanced forward through the key withdraw opening  249  formed on the rear surface of the driving gear  240 . On the contrary, the bidet key  227  formed on the side surface of the bidet nozzle  220  is, as shown in  FIG. 18 , is hooked on the inner circumference of the lower gear teeth-forming rib  248 . 
   By the above-described structure, the advancing of one of the washing and bidet nozzles is not affected by the other. 
   It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.