Automatic liquid soap supply apparatus

Abstract: An automatic liquid soap supply apparatus comprises a plurality of sub-units (10,11,12,40,41,42) each having a use detection circuit (20,21,22,50,51,52) for detecting the use of a liquid soap supply tap (2,3,4,31,32,33) and a pump driving circuit (23,24,25,56,57,58) connected with the use detection circuit, pumps (5,6,7) each disposed to each of the sub-units, connected to each of the pump driving circuits for supplying a liquid soap to each of the supply taps and a main unit (13,43) having a single power source circuit connected with each of the use detection circuits. As an alterative to individual pumps a single pump (38) may be connected with each of the pump driving circuits for supplying the liquid soap to each of the supply taps.

Description: The present invention concerns an automatic liquid soap supply apparatus for use in the automatic supply of liquid soap at a plurality of water supply taps. At a washing stand, for example, of a public lavatory, there are disposed a plurality of water discharging taps for supplying hand washing warmed water, as well as supply taps corresponding to the number of the water discharging taps for supplying a liquid soap. As a structure for supplying the liquid soap to each of the supply taps, an individual supply structure or a gravitational supply structure has been used generally. In the individual supply structure, reservoirs for storing liquid soap are disposed corresponding respectively to the supply taps and liquid soap is supplied from each of the reservoirs to each of the supply taps. However, in the individual supply structure, since the liquid soap has to be supplemented to each of the reservoirs, administration is complicated. In view of the above, in the gravitational structure, a single reservoir for storing a liquid soap is disposed above each of the supply taps, so that the liquid soap is distributed by the own weight of the soap in the reservoir to each of the supply taps. However, it is extremely difficult for a worker to supplement the liquid soap in the reservoir disposed above in this structure. A pressurized type automatic liquid soap supply apparatus as shown in Fig. 4 has been proposed in view of the difficulty in the gravitational structure. The apparatus comprises a single main reservoir 100 and a plurality of auxiliary reservoirs 104, 105 and 106 connected to the main reservoir 100 and corresponding to each of the supply taps 101, 102 and 103, in which each of the auxiliary reservoirs 104, 105 and 106 is connected by way of respective solenoid pumps 107, 108 and 109 to respective supply taps 101, 102 and 103. Further, touch switches 110, 111 and 112 are disposed in the vicinity of the supply taps 101, 102 and 103 respectively and each of the touch switches 110, 111 and 112 is connected to respective control circuits 113, 114 and 115, and respective control circuits 113, 114 and 115 are connected with the solenoid pumps 107, 108, 109. Each of the control circuits 113, 114 and 115 and the solenoid pumps 107, 108 and 109 are separately driven by a power source individually and when one (or a plurality of them) is supplied with electric power, each of the solenoid pumps 107 (108,109) is driven by respective control circuits 113 (114,115) upon contact of a user on the touch switch 110 (111,112), so that the liquid soap in each of the auxiliary reservoirs 104 (105, 106) is supplied being driven by each respective solenoid pump 107 (108,109) from each respective supply tap 101 (102,103). According to this apparatus, since each of the auxiliary reservoirs 104, 105 and 106 is always connected with the main reservoir 100, it may suffice to supplement the liquid soap only to the inside of the main reservoir 100 and since there is no requirement to dispose the main reservoir 100 at a high place, the operation for supplementing the liquid soap is facilitated. However, the existent automatic liquid soap supply apparatus as described above involves the following various problems. That is, in this apparatus, since each of the control circuits 113, 114 and 115 and each of the solenoid pumps 107, 108 and 109 disposed corresponding to each of the supply taps 101, 102 and 103 is separately driven by an individual power source, connection plugs 116, 117 and 118 have to be disposed by the number corresponding to that of the supply taps 101, 102 and 103 in a public lavatory. Accordingly, this makes the electrical wiring troublesome and makes it difficult to shorten the necessary time upon installation. In addition, warmed water from a discharge tap (not illustrated) used by a user often splashes from a washing stand 119, 120 or 121 and a great amount of water is used for cleaning. Accordingly, there may be a risk of electric discharge in the apparatus of this structure. Further, in a cold district or highly humid district or season, the device of the above-mentioned structure also causes a great risk of electric discharge in the lavatory. Accordingly, in the apparatus having the above-mentioned structure, leakage proof countermeasures have to be taken corresponding to each of the supply taps 101, 102 and 103. Moreover, in the existent apparatus as described above, although the supplement for the liquid soap is simplified, since supply and stop of the power source to each of the control circuits 113, 114 and 115 and each of the solenoid pumps 107, 108 and 109 can be conducted only when the connection is made or released between each of the plugs 116, 117 and 118 and each of individual power sources, the operation efficiency, for example, upon cleaning is worsened. The present invention is proposed for solving the foregoing problems in the existent automatic liquid soap supply device as described above and it is an object thereof to supply an automatic liquid soap supply device capable of simplifying the electric wiring and shortening the construction time upon installation, with reduced risk of electric leakage and, further, enabling of rapid cleaning operation. According to the present invention, there is provided an automatic liquid soap supplying device comprising a plurality of liquid soap supply taps to eject liquid soap, a plurality of sub-units associated with the respective liquid soap supply taps, each sub-unit having a use detection circuit for detecting the use of a liquid soap supply tap and a pump driving circuit connected to and activated by said use detection circuit, a reservoir for storing the liquid soap to supply the liquid soap to the respective liquid soap supply taps, pumps associated with the respective sub-units each pump being connected to a respective pump driving circuit for supplying the liquid soap in the reservoir to a respective supply tap, characterised in that each sub-unit has a sensor for sensing presence of a hand located under the liquid soap supply tap and connected to the use detection circuit, and in that said automatic liquid soap supplying device further comprises a main unit having a single power source circuit connected with each of said use detection circuits so that each pump is driven to supply the liquid soap to the liquid soap supply tap when the sensor detects the hand and a level detection circuit for detecting a level of the liquid soap in the reservoir so that each pump is actuated when said sensor detects the hand while said level detection circuit detects a level in said reservoir higher than a predetermined level. In the automatic liquid soap supply apparatus according to preferred arrangements, when one or more of the supply taps disposed in plurality is used, a use detection circuit connected with the single power source circuit constituting the main unit and constituting each of the sub-units is actuated, a pump driving circuit is further actuated by the actuation of the use detection circuit, and the liquid soap is discharged from the supply tap under the driving of the respective pumps. Accordingly, with the automatic liquid soap supply apparatus of this constitution, since the respective use detection circuits and the pump driving circuits constituting the respective sub-units are connected to the single power source circuit, it may suffice to merely connect a connection terminal for the sub-unit with a connection terminal for the main unit upon installation of the apparatus in, e.g. a lavatory, which makes electric work extremely simple and rapid and can effectively avoid the risk of electric leakage. Further, since all of the use detection circuits and the pump driving circuits constituting the sub-units are turned off by merely turning the single power source to off, operation efficiency upon cleaning can be improved as well. In particular, by providing a level detection circuit for detecting the level of the liquid soap in the reservoir, a worker can rapidly supplement the liquid soap when the liquid soap in the reservoir lowers to a predetermined level. An embodiment of the invention will now be described by way of example, and with reference to the accompanying drawings, in which:- Fig. 1 is a schematic view illustrating the constitution of an automatic liquid soap supply apparatus according to the present invention; Fig. 2 is a block diagram for the automatic liquid soap supply apparatus shown in Fig. 1; Fig. 3 is a flow chart for the automatic liquid soap supply apparatus shown in Fig. 1; and Fig. 4 is a schematic view illustrating the constitution of an existent automatic liquid soap supply apparatus. An automatic liquid soap supply apparatus according to this embodiment mainly comprises, as shown in Fig. 1, a plurality of supply taps 2, 3 and 4 for supplying a liquid soap, pumps 5, 6 and 7 connected to the supply taps 2, 3 and 4 respectively, a reservoir 9 connected by way of a pipe 8 to the pumps 5, 6 and 7, for storing a liquid soap (or water soap) S, sub-units 10, 11 and 12 connected with the pumps 5, 6 and 7 respectively, and a main unit 13 connected with each of the sub-units 10, 11 and 12. In this embodiment, sensors 2a, 3a and 4a are disposed, respectively, to the supply taps 2, 3 and 4, for detecting the use of the supply taps 2, 3 and 4, and the sensors 2a, 3a and 4a are connected, respectively, to the sub-units 10, 11 and 12. In this embodiment, each of the pumps 5, 6 and 7 is adapted to actuate only for a predetermined period of time. Further, a level switch 14 is disposed in the reservoir 9 that stores the liquid soap (or water soap) S. Further, a level indication lamp 15 is connected with the main unit 13, and it is adapted to light-up upon detection of the level of the liquid soap S by the level switch 14 disposed in the reservoir 9 to be described later. As shown in Fig. 2, the main unit 13 comprises a power source circuit 17 connected with a plug 16, a level detection circuit 18 disposed in the reservoir 9 and connected with the level switch 14 and a control circuit 19 connected with the level detection circuit 18 and also with the power source circuit 17. Each of the sub-units 10, 11 and 12 is connected with respective sensors 2a, 3a and 4a disposed to each of the supply taps 2, 3 and 4, and comprises respective use detection circuits 20, 21 and 22 supplied with electric power from the control circuit 19 in the main unit 13 and respective pump driving circuits 23, 24 and 25 connected with respective pumps 5, 6 and 7 shown in Fig. 1. Description will be made to the operation of the automatic liquid soap supply device 1 having the constitution as described above with reference to the flow chart shown in Fig. 3. At first, when the device is connected with a power source by the plug 16, it is detected at step st1 as to whether the liquid soap S in the reservoir 9 is at a predetermined level or not. The detection is conducted by the level detection circuit 18 constituting the main unit 13 by way of the level switch 14 disposed in the reservoir 9. Then, if it is judged that the liquid soap is at a predetermined level by the level detection circuit 18, the flow goes to step st2. At the step st2, the level indication lamp 15 connected with the level detection circuit 18 is put off based on an output signal from the control circuit 19 connected with the level detection circuit 18 and the flow goes to step st3, step st4 and step st5. At each of the step st3, step st4 and step st5, the electric power from the power source circuit 17 is supplied by way of the control circuit 19 to each of the sub-units 10, 11 and 12 and then the flow goes to step st6, step st7 and step st8. At each of the step st6, step st7 and step st8, it is detected by each of the use detection circuits 20, 21 and 22 as to whether each of the supply taps 2, 3 and 4 is used or not. That is, when a user brings his hand closer to any one of the supply taps 2, 3 and 4 for using the same, the use detection circuit 20 (21,22) connected with the sensor 2a (3a,4a) detects the use of the supply tap 2 (3,4) by way of the corresponding sensor 2a (3a, 4a) and then the flow goes to step st9, step st10 and step st11, respectively. At the step st9, step st10 and step st11, the respective pump driving circuits 23, 24 and 25 connected with the respective use detection circuits 20, 21 and 22 drive the corresponding pumps 5, 6 and 7 for a predetermined period of time. Upon driving of the pump 5, 6 or 7, the liquid soap S in the reservoir 9 is supplied by way of the pipe 8 to supply tap 2, 3 or 4. Subsequently, the flow returns from the step 9, 10 and 11 to the step st1. If the use of the supply tap 2, 3 or 4 is not detected in each of the st6, step st7 and step st8, the flow returns again to the step st1. Then, when the liquid soap S in the reservoir 9 is gradually decreased while the operations from the step st1 to the step st9, step st10 and the step st11 are conducted continuously and the liquid soap S is supplied from each of the supply taps 2, 3 and 4 and, as a result, when the level switch 14 is actuated to detect that the liquid soap S is no more present by the level detection circuit 18, the flow goes from the step st1 to a step st12. At the step st12, the level indication lamp 15 connected with the control circuit 19, which receives a signal output from the level detection circuit 18, is lighted-up to inform that the liquid soap S in the reservoir 10 does not reach a predetermined level and the flow further goes to a step st13. At the step st13, power source supplied so far from the power source circuit 17 to each of the sub-units 10, 11 and 12 is stopped and the flow returns again to the step st1. In the automatic liquid soap supply apparatus 1 according to the embodiment as described above, each of the use detection circuits 20, 21 and 22 and each of the pump driving circuits 23, 24 and 25 constituting each of the sub-units 10, 11 and 12 are supplied with electric power respectively from the single power source circuit constituting the main unit 13 and actuated by the power source based on the detection signal from each of the sensors 2a, 3a and 4a. Accordingly, for the electric wiring on installing the apparatus 1 in a public lavatory or the like, it is not required to dispose power sources and plugs corresponding to each of the sub-units 10, 11 and 12 but it may suffice to merely connect the power source to the connection terminal for the main unit 13 or the sub-unit 10, 11 or 12. This can improve the operation efficiency and shorten the necessary time for construction. In addition, when a supply tap is additionally provided and a sub-unit is added the additional sub-unit requires no separate power source and, accordingly, it can be mounted extremely simply. Furthermore, in the apparatus 1, since each of the sub-units 10, 11 and 12 has no individual power source, a risk of causing electric leakage from such individual power source can effectively be prevented in a public lavatory using a great amount of warmed water. Further, in the automatic liquid soap supply device according to this embodiment, since the level switch 14, the level indication circuit 18 and the level indication lamp 15 are disposed and the switch for the level switch 14 is turned ON when the liquid soap S in the reservoir 9 is decreased to less than a certain level and the level indication lamp is lighted-up by way of the level detection circuit 18 and the control circuit 19, it can be judged simply if as to whether it is necessary to supplement the liquid soap S or not. The automatic liquid soap supply apparatus 1 described above comprises a level switch for detecting the level detection in a tank that stores the liquid soap and a level detection circuit for detecting the on-state of the level switch as the constituent factors. Further, although the automatic liquid soap supply apparatus 1 described above comprises three supply taps and three sub-units corresponding thereto as an illustrated embodiment, the number of the supply taps and the sub-units is not restricted only thereto. As apparent from the description of the embodiment of the present invention described above, in the automatic liquid soap supply apparatus according to the present invention, when one or more of supply taps disposed in plurality is used, the use detection circuit connected with the single power source constituting the main unit and constituting each of the sub-units is actuated and, further, the pump driving circuit and the liquid soap is discharged from the supply tap by the driving of the pump. Accordingly, in the automatic liquid soap supply apparatus having the constitution as described above, since the use detection circuit and the pump driving circuit constituting each of the sub-units are connected with the single power source circuit, it may suffice to merely connect a connection terminal for the sub-unit with a connection terminal for the main unit, in a case where the device is installed in a lavatory or the like, and the installation work can be conducted extremely simply and rapidly. In addition, the size of the sub-unit can be reduced and the danger of electric leakage can also be avoided effectively. Furthermore, since all of the operations for the use detection circuits and the pump driving circuits constituting the sub-unit are turned off by merely turning off the single power source, the operation efficiency can be improved also during cleaning. In addition, the liquid soap in the reservoir can be observed easily by the level detection circuit to further improve the operation efficiency.

Claims: An automatic liquid soap supplying device (1) comprising a plurality of liquid soap supply taps (2,3,4) to eject liquid soap (S), a plurality of sub-units (10,11,12) associated with the respective liquid soap supply taps (2,3,4), each sub-unit (10,11,12) having a use detection circuit (20,21,22) for detecting the use of a liquid soap supply tap and a pump driving circuit (23,24,25) connected to and activated by said use detection circuit (20,21,22), a reservoir (9) for storing the liquid soap (S) to supply the liquid soap (S) to the respective liquid soap supply taps (2,3,4), pumps (5,6,7) associated with the respective sub-units (10,11,12) each pump (5,6,7) being connected to a respective pump driving circuit (23,24,25) for supplying the liquid soap (S) in the reservoir (9) to a respective supply tap(2,3,4), characterised in that each sub-unit (10,11, 12) has a sensor (2a,3a,4a) for sensing presence of a hand located under the liquid soap supply tap (2,3,4) and connected to the use detection circuit, and in that said automatic liquid soap supplying device (1) further comprises a main unit (13) having a single power source circuit (17) connected with each of said use detection circuits (20,21,22) so that each pump (5,6,7) is driven to supply the liquid soap (S) to the liquid soap supply tap (2,3,4) when the sensor (2a,3a,4a) detects the hand and a level detection circuit (18) for detecting a level of the liquid soap (S) in the reservoir (9) so that each pump (5,6,7) is actuated when said sensor (2a,3a,4a) detects the hand while said level detection circuit (18) detects a level in said reservoir (9) higher than a predetermined level. Apparatus as claimed in claim 1, wherein a detection signal is inputted from a level sensor (14) disposed in the reservoir (9) to the level detection circuit (18). Apparatus as claimed in claim 1 or 2, wherein an indication lamp which is lighted-up when a level is below a predetermined value is provided. Apparatus as defined in any preceding claim, wherein a detection signal is inputted to the use detection circuit (20,21,22) from the sensor (2a,3a,4a) when the hand put below the supply tap (2,3,4) is detected.

Inventors: SAITOH SHIRO C O INAX CORPORAT, SAITOH, SHIRO, C/O INAX CORPORATION
Applicants: INAX CORP, INAX CORPORATION
Application year: 1992
Main classification: A47K5
IPC codes: A47K5