US3650435A - Photoelectric controlled dispenser - Google Patents
Photoelectric controlled dispenser Download PDFInfo
- Publication number
- US3650435A US3650435A US25445A US3650435DA US3650435A US 3650435 A US3650435 A US 3650435A US 25445 A US25445 A US 25445A US 3650435D A US3650435D A US 3650435DA US 3650435 A US3650435 A US 3650435A
- Authority
- US
- United States
- Prior art keywords
- scr
- dispenser
- silicon
- current
- controlled rectifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/79—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar semiconductor switches with more than two PN-junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
- H03K17/73—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for dc voltages or currents
Definitions
- ABSTRACT A device for dispensing materials such as detergents without manual control. It is operated by blocking the passage of light to one of two photoelectric cells, as by a hand, which actuates an SCR circuit. The pump is turned off auto rnatically preferably by a pulse generating circuit which interrupts the SCR. The two photocells are connected in series and together function as a voltage divider, comparing ambient light to proximate light.
- This invention relates to automatic dispensers.
- it is a device useful for dispensing detergents, actuated by the interruption of the passage of light to a photoelectric cell.
- This type of automatic operation of the dispenser insures that no harmful micro-organisms will be spread by contact with handles, buttons, or other devices for the operation of the dispenser.
- Detergent dispensers requiring no manual contact for their operation are desirable in hospitals and similar places where highly sanitary conditions must be maintained.
- Horeczky disclosed a dispenser controlled by a photoelectric cell.
- the purpose of the dispenser is similar to applicants but the circuitry differs in several major respects.
- applicant uses a silicon-controlled rectifier; Horeczky employs an amplifier-type circuit responding to voltage changes induced by the photocell.
- Applicant's device applies current to a pump directly from the silicon-controlled rectifier, which is triggered by the photocell. Turnoff is accomplished by the interruption of the SCR anode current.
- Photocell l is employed to detect the strength of the ambient light, i.e., it is positioned so that it is exposed to the ordinary light of the room. It may be called the ambient photocell. Photocell 2 is positioned in such a way that the placement of hands under the dispenser nozzle in the normal manner to receive detergent therefrom will at least partially block the access of light to the photocell. No special light source is contemplated for this photocell, which may be called the proximity photocell. Optional resistor 3 may compensate for a difference in resistance characteristics between photocells land 2.
- the gate of silicon-controlled rectifier 4 is connected to a point between photocells l and 2, so that the photocells act as a voltage divider and current source for it.
- the pump motor 5, which operates the dispensing function of the device, is connected in series which the SCR 4.
- the circuit described to this point may be viewed as the sensing circuit, or a proximity switch.
- the sensing circuit comprises ambient and proximity photocells forming a variable voltage divider as a current source for the gate of an SCR, and means for dispensing material responsive to current flowing through the SCR.
- the motor may be turned off by conventional mechanical or other timing switches, such as a cam switch controlled by motor shaft rotation; however, we prefer to use a turnoff circuit which shunts the SCR circuit.
- a turnoff circuit which shunts the SCR circuit.
- Other types of turnoff circuits may occur to those skilled in the art. I intend to include within the scope of my invention the use of any device for halting the operation of the dispensing means once it has begun.
- capacitor 6 is used for filtering.
- Capacitor 7, together with its associated resistor comprises a time constant network controlling the oscillation of unijunction transistor 8.
- the oscillator output of unijunction transistor 8 controls the gate of silicon-controlled rectifier 9.
- a material dispenser comprising two photocells adapted to be connected in series across a DC power source and forming a variable voltage divider, a silicon-controlled rectifier responsive to current coming directly from said variable voltage divider, means responsive to current from said siliconcontrolled rectifier for dispensing material, and turnoff means for ceasing operation ofthe dispensing means.
- Dispenser of claim 1 in which the turnoff means comprise a capacitor-actuated unijunction transistor and a silicon-controlled rectifier responsive thereto.
Abstract
A device is disclosed for dispensing materials such as detergents without manual control. It is operated by blocking the passage of light to one of two photoelectric cells, as by a hand, which actuates an SCR circuit. The pump is turned off automatically preferably by a pulse generating circuit which interrupts the SCR. The two photocells are connected in series and together function as a voltage divider, comparing ambient light to proximate light.
Description
United States Patent Kleefeid 51 msmss [451 Mar M, 1972 PHOTOELECTRIC CONTROLLED DISPENSER Primary ExaminerStanley H. Tollberg Att0rneyWilliam L. Krayer [57] ABSTRACT A device is disclosed for dispensing materials such as detergents without manual control. It is operated by blocking the passage of light to one of two photoelectric cells, as by a hand, which actuates an SCR circuit. The pump is turned off auto rnatically preferably by a pulse generating circuit which interrupts the SCR. The two photocells are connected in series and together function as a voltage divider, comparing ambient light to proximate light.
3 Claims, 1 Drawing Figure SENS/N5 CIRCUIT PHOTOELECTRIC CONTROLLED DISPENSER BACKGROUND OF THE INVENTION This invention relates to automatic dispensers. In particular, it is a device useful for dispensing detergents, actuated by the interruption of the passage of light to a photoelectric cell. This type of automatic operation of the dispenser insures that no harmful micro-organisms will be spread by contact with handles, buttons, or other devices for the operation of the dispenser. Detergent dispensers requiring no manual contact for their operation are desirable in hospitals and similar places where highly sanitary conditions must be maintained.
ln U.S. Pat. No. 3,273,752, Horeczky disclosed a dispenser controlled by a photoelectric cell. The purpose of the dispenser is similar to applicants but the circuitry differs in several major respects. As will be seen in the description to follow, applicant uses a silicon-controlled rectifier; Horeczky employs an amplifier-type circuit responding to voltage changes induced by the photocell.
SUMMARY OF THE INVENTION Applicant's device applies current to a pump directly from the silicon-controlled rectifier, which is triggered by the photocell. Turnoff is accomplished by the interruption of the SCR anode current.
The invention will be more particularly described with reference to the attached diagrammatic drawing.
ln the drawing, it will be seen that the DC power source is connected to two photocells in series.
Photocell l is employed to detect the strength of the ambient light, i.e., it is positioned so that it is exposed to the ordinary light of the room. It may be called the ambient photocell. Photocell 2 is positioned in such a way that the placement of hands under the dispenser nozzle in the normal manner to receive detergent therefrom will at least partially block the access of light to the photocell. No special light source is contemplated for this photocell, which may be called the proximity photocell. Optional resistor 3 may compensate for a difference in resistance characteristics between photocells land 2.
The gate of silicon-controlled rectifier 4 is connected to a point between photocells l and 2, so that the photocells act as a voltage divider and current source for it. The pump motor 5, which operates the dispensing function of the device, is connected in series which the SCR 4.
The circuit described to this point may be viewed as the sensing circuit, or a proximity switch. When the resistance in proximity photocell 2 increased due to a decrease in light reaching it, a voltage caused thereby at the gate of the SCR 4 fires the SCR, permitting the flow of current through the anode of the SCR to the motor 5. It thus may be seen that the sensing circuit comprises ambient and proximity photocells forming a variable voltage divider as a current source for the gate of an SCR, and means for dispensing material responsive to current flowing through the SCR.
Once the SCR is fired, the motor may be turned off by conventional mechanical or other timing switches, such as a cam switch controlled by motor shaft rotation; however, we prefer to use a turnoff circuit which shunts the SCR circuit. Other types of turnoff circuits may occur to those skilled in the art. I intend to include within the scope of my invention the use of any device for halting the operation of the dispensing means once it has begun.
In the turnoff circuit, capacitor 6 is used for filtering. Capacitor 7, together with its associated resistor comprises a time constant network controlling the oscillation of unijunction transistor 8. The oscillator output of unijunction transistor 8 controls the gate of silicon-controlled rectifier 9. When the gate of SCR 9 is opened a. new current flow begins, shunting out the current to the motor and closing the gate of SCR 4. The gate of SCR 9 is then closed for lack of power, and
the deyice returns to its inactive state. I 4 I It will be seen that, so long as there is an insignificant difference in the two sides of the voltage divider formed by the photocells and the associated resistor 3, very little energy is consumed. My invention is thus especially adapted for use with batteries. It may be mounted on the wall near a sink in a hospital, for example, without the necessity of providing a power source by breaking into the wall. Relatively inexpensive, commercially available photocells in my circuit can detect the presence of a hand up to 2 feet away from the proximity photocell. The unit may operate on a 6 volt battery with average current requirements of less than I milliampere. It should be observed that my device employs no moving parts ahead of the motor, which derives its power directly from the SCR and without amplification.
I do not intend to be bound by the above specific illustration. My invention may be otherwise variously practiced and embodied within the scope of the following claims.
lclaim:
l. A material dispenser comprising two photocells adapted to be connected in series across a DC power source and forming a variable voltage divider, a silicon-controlled rectifier responsive to current coming directly from said variable voltage divider, means responsive to current from said siliconcontrolled rectifier for dispensing material, and turnoff means for ceasing operation ofthe dispensing means.
2. Dispenser of claim 1 in which the turnoff means comprise a capacitor-actuated unijunction transistor and a silicon-controlled rectifier responsive thereto.
3. Dispenser of claim 1 in which the means responsive to current from the siliconcontrolled rectifier is a pump.
Claims (3)
1. A material dispenser comprising two photocells adapted to be connected in series across a DC power source and forming a variable voltage divider, a silicon-controlled rectifier responsive to current coming directly from said variable voltage divider, means responsive to current from said silicon-controlled rectifier for dispensing material, and turnoff means for ceasing operation of the dispensing means.
2. Dispenser of claim 1 in which the turnoff means comprise a capacitor-actuated unijunction transistor and a silicon-controlled rectifier responsive thereto.
3. Dispenser of claim 1 in which the means responsive to current from the silicon-controlled rectifier is a pump.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2544570A | 1970-04-03 | 1970-04-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3650435A true US3650435A (en) | 1972-03-21 |
Family
ID=21826116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US25445A Expired - Lifetime US3650435A (en) | 1970-04-03 | 1970-04-03 | Photoelectric controlled dispenser |
Country Status (1)
Country | Link |
---|---|
US (1) | US3650435A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4967935A (en) * | 1989-05-15 | 1990-11-06 | Celest Salvatore A | Electronically controlled fluid dispenser |
US4977854A (en) * | 1988-09-12 | 1990-12-18 | Marrs Thomas L | Remote dispenser for fish attractant |
US5397028A (en) * | 1992-04-29 | 1995-03-14 | Jesadanont; Mongkol | Automatic fluid dispenser and method |
US5477984A (en) * | 1993-04-27 | 1995-12-26 | Saraya Co., Ltd. | Liquid jetting apparatus for jetting liquid toward a hand for disinfection thereof |
US5695091A (en) * | 1995-10-25 | 1997-12-09 | The Path-X Corporation | Automated dispenser for disinfectant with proximity sensor |
US6517009B2 (en) | 1997-12-25 | 2003-02-11 | Gotit Ltd. | Automatic spray dispenser |
US20080246599A1 (en) * | 2007-03-30 | 2008-10-09 | Toronto Rehabilitation Institute | Hand hygiene compliance system |
US20100117836A1 (en) * | 2007-03-30 | 2010-05-13 | Toronto Rehabilitation Institute | Hand hygiene compliance system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3273752A (en) * | 1965-02-11 | 1966-09-20 | Geza E Horeczky | Photo-electric controlled dispenser |
-
1970
- 1970-04-03 US US25445A patent/US3650435A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3273752A (en) * | 1965-02-11 | 1966-09-20 | Geza E Horeczky | Photo-electric controlled dispenser |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4977854A (en) * | 1988-09-12 | 1990-12-18 | Marrs Thomas L | Remote dispenser for fish attractant |
US4967935A (en) * | 1989-05-15 | 1990-11-06 | Celest Salvatore A | Electronically controlled fluid dispenser |
US5397028A (en) * | 1992-04-29 | 1995-03-14 | Jesadanont; Mongkol | Automatic fluid dispenser and method |
US5477984A (en) * | 1993-04-27 | 1995-12-26 | Saraya Co., Ltd. | Liquid jetting apparatus for jetting liquid toward a hand for disinfection thereof |
US5695091A (en) * | 1995-10-25 | 1997-12-09 | The Path-X Corporation | Automated dispenser for disinfectant with proximity sensor |
US6517009B2 (en) | 1997-12-25 | 2003-02-11 | Gotit Ltd. | Automatic spray dispenser |
US6540155B1 (en) | 1997-12-25 | 2003-04-01 | Gotit Ltd. | Automatic spray dispenser |
US20080246599A1 (en) * | 2007-03-30 | 2008-10-09 | Toronto Rehabilitation Institute | Hand hygiene compliance system |
US20100117836A1 (en) * | 2007-03-30 | 2010-05-13 | Toronto Rehabilitation Institute | Hand hygiene compliance system |
US7898407B2 (en) | 2007-03-30 | 2011-03-01 | Toronto Rehabilitation Institute | Hand hygiene compliance system |
US8237558B2 (en) | 2007-03-30 | 2012-08-07 | University Health Network | Hand hygiene compliance system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3650435A (en) | Photoelectric controlled dispenser | |
US4921150A (en) | Automatic dispensing apparatus having low power consumption | |
US20190171244A1 (en) | Hands-free dispensers with managed power consumption | |
US5187818A (en) | Flushing system for a water closet | |
CA2635169C (en) | Fluid dispenser having infrared user sensor | |
AU643985B2 (en) | Automatic flow-control device | |
US3589563A (en) | Long period battery-operated aerosol dispenser | |
US7325767B2 (en) | Microprocessor controlled hands-free paper towel dispenser | |
CN101663568B9 (en) | Electric soap dispenser | |
WO1994000645A1 (en) | Hands-free water flow control apparatus and method | |
US2813274A (en) | Automatic waste bowl flusher | |
US4338562A (en) | Load control circuit with timed interruption | |
US2738448A (en) | Electric eye for automatically operating flushing valve | |
IL100684A (en) | Device for dispensing predetermined dosages of flowable material | |
GB2100312A (en) | Cistern regulator | |
US3978352A (en) | Control circuit | |
KR920005983Y1 (en) | Device for washing toilet bowl | |
GB1529162A (en) | Solid state on-delay timer | |
KR930006769Y1 (en) | Solenoid valve control circuit for water saving | |
ATE23431T1 (en) | ELECTRICALLY ACTUABLE DISPENSING DEVICE. | |
JPS5454263A (en) | A.c. power regulator circuit | |
AU592135B2 (en) | Vapour sensor | |
KR950005595Y1 (en) | Automatic water closets | |
JPH0734389Y2 (en) | Automatic water washing device | |
SU568958A1 (en) | Speed-responsive relay |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CALGON CORPORATION ROUTE 60 & CAMPBELL S RUN ROAD, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE JULY 1, 1982;ASSIGNOR:CALGON CARBON CORPORATION (FORMERLY CALGON CORPORATION) A DE COR.;REEL/FRAME:004076/0929 Effective date: 19821214 |