Air vent control apparatus
BACKGROUND OF THE INVENTION 
     This invention relates to an air vent control apparatus, and more particularly to an air vent control apparatus in which a connecting member is provided for simultaneously moving a plurality of horizontal swing louvers. 
     An ordinary air conditioner is shown in FIGS. 6 and 7. An air intake opening 1 is formed at the upper portion of a front surface while a discharge opening 2 is formed at the lower portion of the front surface. Behind the front surface are mounted a heat exchanger (not shown) in which refrigerant being in a state of low pressure and temperature and thus suitable to be evaporated is flowed, and a fan (not shown) for circulating the indoor air. Further, behind the discharge opening 2 are provided vertical swing louvers 3 and horizontal swing louvers 4. 
     In the air conditioner, as the fan rotates, the indoor air is drawn through the intaking opening 1 and the temperature of the indoor air is lowered while passing the heat exchanger. Further, the cool air is discharged through the discharge opening 2, thus cooling the indoors. At this time, the air flow with respect to the vertical or the horizontal direction is controlled by corresponding swing louvers 3,4. 
     Next, the conventional air vent apparatus, shown in FIG. 7, comprises an upper 5 and a lower plate 6 defining the discharge opening 2, a hinge pin 4a protruded at the rear of the upper portion of respective horizontal swing louvers 4, a bushing 7 fitted on the hinge pin 4a, an opening 5a formed in the upper plate 5 for receiving the bushing 7, and a pin 4b protruded at the front of the upper portion of respective horizontal swing louvers 4. The air vent apparatus further comprises a connecting bar 8 for linking together a plurality of pins 4b and for controlling simultaneously those pins 4b, and an auxiliary connecting bar 9 fitted into a slot 4c formed at the upper portion of the horizontal swing louvers 4. 
     In the conventional air vent control apparatus, the hinge pin 4a is preliminarily inserted into the opening 5a, and the bushing 7 is force-fitted into the opening 5a so as to frictionally grip the hinge pin 4a. Next, a plurality of pins 4b of one set of louvers 4 are linked with each other by the connecting bar 8, and the auxiliary connecting bar 9 is fitted through the slot 4c formed in a louver 4 of that set of horizontal swing louvers 4 and also through the slot 4c&#39; formed in a louver 4&#39; of a neighboring set of horizontal swing louvers 4&#39;. That creates the simultaneous swinging of the two sets of louvers 4,4&#39;. 
     That is, in the air vent control apparatus, when one swing louver 4 is horizontally moved, a plurality of louvers 4,4&#39; of a plurality of sets of are simultaneously moved in a horizontal swing direction by the connecting bar 8 and the auxiliary connecting bar 9. The direction of air flow can thus be changed. 
     However, because the connecting bar 8 and the auxiliary connecting bar 9 are exposed to the air flow of the air discharge opening 2, the outflowing air is hindered by the connecting bar 8, 9 located in the outflowing air opening 2. That produces the problem that the air flow noise is increased and the volume of air flow is reduced due to the obstructing bars 9. 
     Further, due to irregularities on the contacting surfaces of the pins on the louvers, the openings on the upper plates and the bushing 7, a smooth fit may not be established. Accordingly, the louver may be set to a position offset from the intended position. Such an offset contributes to the noise problem. Additionally, the louvers may swing about its axis in an unsmooth manner. 
     Furthermore, amount of assembly time necessary for inserting pins 4a and 4b of each of the louvers into openings in the upper plate 5 and connecting bar 8, respectively, is significantly long. Thus, productivity is not optimized. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide an air vent control apparatus which solves the above problems. 
     Another object of the present invention is to provide an air vent control apparatus in which the connecting members for simultaneously moving respective horizontal swing louvers are no exposed in the air flow to avoid interference with the outflowing air. 
     Another object of the present invention is to provide an air vent control apparatus in which respective horizontal swing louvers are detachably assembled with a minimal tolerance, thereby reducing the operational noise of a fan. 
     Another object of the present invention is to provide an air vent control apparatus in which the assembly between pins formed in respective louvers and a connecting member for fastening the pins is improved by simplifying the connecting structures for the benefit of a smoother rotation of the horizontal swing louvers and reducing the assembly time. 
     According to the present invention, the air vent control apparatus comprises a plurality of horizontal swing louvers, hinge pins formed on respective louvers for hingedly swinging said louvers, a supporting member for rotatably supporting the hinge pins, and a connecting member for integrally connecting a plurality of hinge pins. 
     Further, the pins are supported in openings defined cooperatively by detachable fitting components. 
     Further, the connecting member is encircled by a fixing member to be shielded from the flow of the discharging air. 
     Furthermore, the air vent control apparatus further comprises a directional setting means for controlling the direction of the outflowing air. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a vertical sectional view of an indoor unit of an air conditioner having an air vent control apparatus according to the present invention; 
     FIG. 2 is a perspective exploded view of the air vent control apparatus of FIG. 1; 
     FIG. 3 is a perspective view of the upper plate of the air vent control apparatus of FIG. 2; 
     FIG. 4 is a vertical sectional view of the air vent control apparatus of FIG. 2; 
     FIG. 5 is a view taken along line 5--5 of FIG. 4; 
     FIG. 6 is a front view of a conventional air conditioner; and 
     FIG. 7 is a perspective exploded view of the air vent control apparatus according to the prior art. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In FIG. 1, an indoor unit of an air conditioner comprises an air intaking opening 10 and an air discharging opening 11 which are disposed above and below a heat exchanger 15, respectively, at fan 16 a front portion of the unit A is rotatably mounted behind and to the rear of the heat exchanger 15. The indoor unit further comprises a horizontal swing louver 20 and a vertical swing louver 19 which are hingedly mounted at the discharge opening 11 for controlling the air flow direction, and a guide plate 17 encircling the rear portion of the fan 16 for guiding the heat-exchanged air toward the discharge opening 11. The heat exchanger 15 is bent to form upper and lower portions, and an air cleaner 18a is placed on the upper portion of the heat exchanger 15. At the rear surface of the intaking opening 10 is installed a filter 18 for collecting dust. 
     The discharging opening 11, as shown in FIG.2, comprises an upper plate 12 and a lower plate 13. Behind the upper plate 12 is provided a fixing member 14 for guiding the discharging air flow when rotating the fan 16, and for reducing the noise. A condensed water collecting portion 12c is formed on the upper surface of the upper plate 12 adjacent to the lower end of the heat exchanger 15. The water collecting portion 12c is for collecting the condensed water generated during the heat exchange cycle. 
     Further, the vertical swing louver 19 is provided at the outlet or front portion of the discharging opening 11, while the horizontal swing louver 20 is provided at the inlet, or rear portion of the discharging opening 11 as shown in FIG. 1. The vertical swing louver 19 is hingedly mounted along the longitudinal direction of the discharging opening 11, that is, a direction perpendicular to the plane of the paper in FIG. 1. Preferably, two vertical swing louvers 19 are employed to adapt the vertical width of the discharging opening 11. Pin 19P protrudes from each end of the vertical swing louvers 19, and the pins 19P are inserted into respective side walls of the discharging opening 11 for forming axes enabling the vertical swing louvers 19 to be swing vertically. 
     Further, a plurality of the horizontal swing louvers 20 are pivotedly mounted about axes oriented perpendicularly to the longitudinal direction of the discharging opening 11, that is, axes extending from the upper left to the lower right in FIG. 1. A plurality of openings 13a are formed in the lower plate 13, while at a lower end of each horizontal swing louver 20 is formed a lower pin 22 for being pivotedly mounted in the opening 13a. At the upper end of each horizontal swing louver 20 an upper pin 21 protrudes coaxilly to the lower pin 22. In the upper plate 12 and the fixing member 14 detachedly assembled with the upper plate 12 are formed respective pin support recesses 12a, 14a for rotatably supporting the each upper pin 21. 
     Also, a connecting member 30 for connecting each upper pin 21 is provided to simultaneously move a set of the horizontal swing louvers 20. The connecting member 30 comprises protruded bars 31 projecting from respective upper pins and toward the fixing member 14, and a connecting bar 32 united with the protruded bars 31. The connecting bar 32 is joined to the protruded base 31 by non-rigid connections defined by respective reduced-thickness portions 33 which provide flexibility to enable the protrusions 31 to move relative to the bar 32 when the horizontal swing louvers 20 are swung around an axis defined by the upper pin 21 and the lower pin 22. When that occurs, the bar connecting 32 is horizontally moved forward or backward in the innerside space 14c of the fixing member 14. 
     At the rear surface of the upper plate 12 are provided a plurality of circular necks 12b having a predetermined radius and encompassing the pin supporting recess 12a as shown in FIG. 3. There is a neck 12b for each of the horizontal swing louvers 20. At the upper portion of the horizontal swing louvers 20 are formed pins 23 for being releasably engageable with grooves 12d formed in a convex surface of the respective necks 12b as shown in FIG. 4 and 5. The convex surface is coaxial with the axis of the respective hinge pin as can be seen in FIG. 5. At the upper left portion of the horizontal swing louver 20 is formed a manual handle 20a for swinging the louvers 20 and enable a lateral tip 23T of the pin 23 to be inserted under tension with selective grooves 12d of the neck 12b. 
     A space 24 is provided at each pin 23. The space 24 is needed for providing simultaneous movement of a set of the horizontal swing louvers 20. One end of an auxiliary connecting member 24a (FIG. 2) is coupled with the pin 23 of one louver of a set of the horizontal swing louvers 20 and is disposed in the space 24 of that louver. The other end of the auxiliary connecting member 24a is coupled with the pin 23&#39; of a louver of a neighboring set of the horizontal swing louvers 20&#39; and is disposed in the space 24&#39; of that louver. Thus, the manual movement of the set of the horizontal swing louvers 20 is transferred to the neighboring set of the horizontal swing louvers 20&#39;. 
     Alternatively, the number 24a could be longitudinally reciprocated by a motor, to swing every horizontal swing louver 20 simultaneously. 
     The air vent control apparatus built as described above is assembled as follows. First, the lower pins 22 of respective horizontal swing louvers 20 are fitted into respective openings 13a of the lower plate 13. Thereafter, with each connecting member 32 connected to a set of pins 21 and disposed within the innerside space 14c of the fixing bar 14, the circumferential rear portion, i.e. the right hand portion of FIG. 2, of each pin 21 is contacted by the surface of the pin supporting recesses 14a. The circumferential front portion, i.e. the left hand portion of FIG. 2, of each pin 21 is contacted by the surface of the pin supporting recesses 12a formed in the upper plate 12. Meanwhile, a protrusion (not shown) and a recess (not shown) can be respectively provided on the fixing member 14 and the upper plate 12 to help interconnect the fixing member 14 and the upper plate 12. To complete the assembly of the apparatus, the vertical swing louvers 19 are inserted into both side walls. 
     In the air vent control apparatus assembled as described above, when the fan 16 rotates, the indoor air is drawn toward the heat exchanger 15 through the intaking opening 10. The air passes through the heat exchanger 15 in which a low temperature and pressure refrigerant gas circulates and the temperature of the air is reduced. 
     When the direction of the air flow is intended to be changed, the vertical swing louvers 19 or the horizontal swing louvers 20 are adjusted in a desired direction. The horizontal swing louvers 20 are swung by the handle 20a about the axis defined by the upper 21 and the lower pin 22. Because respective upper pins 21 of a set of louvers are connected with the connecting bar 32, all swing louvers of that set are simultaneously moved in the same direction when one swing louver is swung. Furthermore, since the connecting bar 32 is connected to the protrusion bars 31 of the pins 21 by the flexible portions 33, the connecting bar 32 is moved forward or backward along the horizontal direction of the innerside space 14c of the fixing member 14 when the protrusion rotate about their own axes. The connecting member 32 disposed in the innerside space 14c does not interfere with air flow. Meanwhile, since the pins 23 are inserted under tension within the grooves 12d of respective necks 12b as shown FIG. 5 during successive swings of the horizontal swing louvers 20, adjusted state is maintained unless an external force is provided after the adjusting process. 
     According to the structure of the air vent control apparatus, the connecting member is not exposed to the discharge air flow because the connecting member is encircled by the upper plate and the fixing member. Thus, the velocity of discharged air cannot be reduced by connecting member. Further, no noise is generated since the discharged air does not blow against an obstacle such as the connecting member, etc. Thus, the noise generated when discharging the air is reduced. Furthermore, since the lower pins of the horizontal swing louvers are slidingly fitted into the openings of the lower plate, and the upper pins are slidingly fitted into the pin supporting recesses formed by the upper plate and the fixing member, it is not necessary to forcedly fit the pins. Hence, an accurate horizontal swing is achieved without the generation of assembly error. Consequently, a simple assembly process is achieved, and the time of the assembly is reduced, thereby increasing manufacturing productivity.