US20010027654A1 - Icemaker assembly - Google Patents
Icemaker assembly Download PDFInfo
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- US20010027654A1 US20010027654A1 US09/873,991 US87399101A US2001027654A1 US 20010027654 A1 US20010027654 A1 US 20010027654A1 US 87399101 A US87399101 A US 87399101A US 2001027654 A1 US2001027654 A1 US 2001027654A1
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- Prior art keywords
- ice
- ice cube
- icemaker assembly
- assembly according
- icemaker
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
- F25C1/12—Producing ice by freezing water on cooled surfaces, e.g. to form slabs
- F25C1/125—Producing ice by freezing water on cooled surfaces, e.g. to form slabs on flexible surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
- F25C1/10—Producing ice by using rotating or otherwise moving moulds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C5/00—Working or handling ice
- F25C5/14—Apparatus for shaping or finishing ice pieces, e.g. ice presses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C5/00—Working or handling ice
- F25C5/18—Storing ice
- F25C5/182—Ice bins therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2400/00—Auxiliary features or devices for producing, working or handling ice
- F25C2400/10—Refrigerator units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2700/00—Sensing or detecting of parameters; Sensors therefor
- F25C2700/02—Level of ice
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C5/00—Working or handling ice
- F25C5/02—Apparatus for disintegrating, removing or harvesting ice
- F25C5/04—Apparatus for disintegrating, removing or harvesting ice without the use of saws
- F25C5/06—Apparatus for disintegrating, removing or harvesting ice without the use of saws by deforming bodies with which the ice is in contact, e.g. using inflatable members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/06—Refrigerators with a vertical mullion
Definitions
- This invention relates generally to an automatic icemaker, and more specifically to an improved icemaker having a conveyor assembly.
- a conventional automatic icemaker in a typical residential refrigerator has three major subsystems: an icemaker, a bucket with an auger and ice crusher, and a dispenser insert in the freezer door that allows the ice to be delivered to a cup without opening the door.
- the icemaker is usually a metal mold that makes between six to ten ice cubes at a time.
- the mold is filled with water at one end and the water evenly fills the ice cube sections through weirs (shallow parts of the dividers between each cube section) that connect the sections. Opening a valve on the water supply line for a predetermined period of time usually controls the amount of water.
- the temperature in the freezer compartment is usually between about ⁇ 10 F to about +10 F.
- the mold is cooled by conduction with the freezer air, and the rate of cooling is enhanced by convection of the freezer air, especially when the evaporator fan is operating.
- a temperature-sensing device in thermal contact with the ice cube mold generates temperature signals and a controller, monitoring the temperature signals indicates when the ice is ready to be removed from the mold.
- a motor in the icemaker drives a rake in an angular motion.
- the rake pushes against the cubes to force them out of the mold.
- a heater on the bottom of the mold is turned on to melt the interface between the ice and the metal mold. When the interface is sufficiently melted, the rake is able to push the cubes out of the mold. Because the rake pivots on a central axis, the cross-sectional shape of the mold typically is an arc of a circle to allow the ice to be pushed out.
- a feeler arm usually driven by the same motor as the rake, is raised from and lowered into the storage bucket. If the arm cannot reach its predetermined low travel set point, it is assumed that the ice bucket is full and the icemaker will not harvest until more ice has been removed from the bucket. If the feeler arm returns to its low travel set point, the ice making cycle repeats.
- the ice storage bucket holds and transports ice to the dispenser in either crushed or whole cube form. If a user requests ice at the dispenser a motor drives an auger that pushes the ice to the front of the bucket where a crusher is located. The position of a door, controlled by a solenoid, determines whether or not the cubes will go through the crusher or by-pass it and be delivered as whole cubes.
- the crusher has sets of stationary and rotating blades that break the cubes as the blades pass each other. The crushed or whole cubes then drop into the dispenser chute.
- the dispenser chute connects the interior of the freezer with the dispenser and usually has a door, activated by a solenoid, that opens when the user requests ice.
- the dispenser has switches that permit the user to select crushed or whole cubes, or water to be delivered to the glass.
- the dispenser may have a switch that senses the presence of a glass and starts the auger motor and opens the chute door.
- An icemaker assembly is disposed within a refrigerator having a freezer compartment, a fresh food compartment and respective freezer and fresh food door assemblies.
- the icemaker assembly comprises a conveyor assembly positioned within the freezer compartment having a flexible conveyor belt with a multiplicity of individual ice cube molds for creation of individual ice cubes.
- An ice cube storage bin is positioned below the conveyor assembly, for example in the freezer door, for storing the ice cubes and a fullness sensor is positioned for determining the fill level of ice cubes within the ice cube storage bin.
- FIG. 1 is a front perspective view of a side-by-side refrigerator with the access doors open;
- FIG. 2 is a part schematic side elevational view of a refrigerator including one embodiment of the instant invention
- FIG. 3 is a part schematic side elevational view of one embodiment of a flexible conveyor belt in accordance with one embodiment of the instant invention
- FIG. 4 is a part schematic view of another aspect of the instant invention.
- FIG. 5 is a part schematic view of another aspect of the instant invention.
- FIG. 6 is a flow chart showing one control scheme in accordance with one embodiment of the instant invention.
- FIG. 7 is a part schematic view of another aspect of the instant invention.
- FIG. 8 is a part schematic view of another aspect of the instant invention.
- FIG. 9 is a part schematic view of another aspect of the instant invention.
- FIG. 10 is a part schematic view of another aspect of the instant invention.
- FIG. 11 is a part schematic view of another aspect of the instant invention.
- FIG. 12 is a part schematic view of another aspect of the instant invention.
- FIG. 13 is a part schematic view of another aspect of the instant invention.
- FIG. 1 is a front perspective view of a side-by-side refrigerator 10 including a freezer compartment 12 and a fresh food compartment 14 . Freezer compartment 12 and fresh food compartment 14 are arranged side-by-side.
- a side-by-side refrigerator such as refrigerator 10 is commercially available from General Electric Company, Appliance Park, Louisville, Ky. 40225.
- Refrigerator 10 includes an outer case 16 and inner liners 18 and 20 .
- Outer case 16 normally is formed by folding a sheet of a suitable material, such as pre-painted steel, into an inverted U-shape to form the top and side walls of case 16 .
- the bottom wall of case 16 normally is formed separately and attached to the sidewalls and to a bottom frame that provides support for refrigerator 10 .
- Inner liners 18 and 20 are typically molded from a suitable plastic material to form freezer compartment 12 and fresh food compartment 14 , respectively.
- liners 18 and 20 may be formed by bending and welding a sheet of a suitable metal, such as steel.
- the illustrative embodiment includes two separate liners 18 and 20 as it is a relatively large capacity unit and separate liners add strength and are easier to maintain within manufacturing tolerances.
- a single liner is formed and a mullion spans between opposite sides of the liner to divide it into freezer compartment 12 and fresh Food compartment 14 .
- a breaker strip 22 extends between the case front flange and the outer front edges of liners 18 and 20 .
- Breaker strip 22 is formed from a suitable resilient material, such as an extruded acrylo-butadiene-styrene based material (commonly referred to as ABS).
- Mullion 24 is preferably formed of an extruded ABS material. It will be understood that in a refrigerator with a separate mullion dividing a unitary liner into a freezer and fresh food compartment, the front face member of that mullion corresponds to mullion 24 . Breaker strip 22 and mullion 24 form a front face, and extend completely around the inner peripheral edges of case 16 and vertically between liners 18 and 20 . Mullion 24 , insulation between compartments 12 and 14 , and the spaced wall of liners 18 and 20 separating compartments 12 and 14 , sometimes are collectively referred to as the center mullion wall.
- Shelves 26 and drawers 28 normally are provided in fresh food compartment 14 to support items being stored therein. Similarly, shelves 30 and wire baskets 32 or the like are provided in freezer compartment 12 .
- a freezer door 36 and a fresh food door 38 close the access openings to freezer and fresh food compartments 12 and 14 , respectively.
- Each door 36 , 38 is mounted by a top hinge 40 and a bottom hinge (not shown) to rotate about its outer vertical edge between an open position, as shown in FIG. 1, and a closed position closing the associated storage compartment.
- Freezer door 36 typically includes a plurality of storage shelves 42 and fresh food door 38 typically includes a plurality of storage shelves 44 and a butter storage bin 46 .
- an icemaker assembly 100 is disposed within freezer compartment 12 , as shown in FIG. 2.
- Icemaker assembly 100 includes a conveyor assembly 102 , a first motor 104 drivingly coupled to conveyor assembly 102 , a second motor 106 drivingly coupled to an ice crusher 108 and an auger mechanism 109 , a refill valve 110 positioned adjacent to conveyor assembly 102 , a first ice cube storage bin 112 , an optional second ice cube storage bin 114 , and a controller 116 electrically coupled to first motor 104 and second motor 106 .
- Conveyor assembly 102 is positioned within freezer compartment 12 , typically within a top portion 118 of freezer compartment 12 , defined by freezer liner 18 , freezer door 36 and a baffle 117 .
- Conveyor assembly 102 comprises at least a front roller 120 and a rear roller 122 and a continuous flexible conveyor belt 124 fitted in tension about front and rear rollers 120 , 122 .
- flexible conveyer belt 124 is made of a flexible polymer.
- flexible conveyer belt 124 is made from a thermoplastic elastomer, butyl rubber, chlorobutyl rubber, natural rubber, synthetic rubber, neoprene rubber, polyurethane, ethylene-propylene-diene modified, ethylene-propylene rubber, silicone rubber or the like. Silicone rubber is particularly preferred.
- a multiplicity of individual ice cube molds 126 are disposed within or upon conveyor belt 124 for creation of individual ice cubes 128 therein.
- ice cube molds 126 are molded directly into the material of flexible conveyor belt 124 .
- ice cube molds 126 are made of a rigid material and are fixedly attached to conveyor belt 124 .
- the rigid material can be, for example, polypropylene, polyethylene, nylon, ABS, or the like.
- Flexible conveyor belt 124 dimensions can vary depending upon the size of freezer compartment 12 and the desired ice cube 128 output for a respective freezer icemaker assembly 100 .
- a nominal linear length (l) of flexible conveyor belt 124 is in the range between about 12 inches to about 18 inches
- a nominal width (w) is in the range between about 3 inches to about 8 inches
- a nominal depth (d) is in the range between about 0.5 inches to about 1.5 inches, as shown in FIG. 3.
- the number of separate ice cube molds 126 is dependent upon the desired icemaking capacity, but a nominal number of individual ice cube molds 126 is in the range between about 20 to about 300 divided into a nominal number of rows (r) in the range between about 10 to about 30 and a nominal number of columns (c) in the range between about 2 to about 10.
- the dimensions of an individual ice cube mold 126 can vary depending on the size of ice cubes 128 desired but a nominal length (x) is in the range between about 0.75 inches to about 2 inches, and a nominal width (y) is in the range between about 0.5 inches to about 1.5 inches.
- a variety of cube shapes can be used, including any conventional shapes as well as ornamental shapes such as fish, penguins, scallops, hemispheres, or the like.
- First motor 104 (FIG. 2) is drivingly coupled to conveyor assembly 102 .
- first motor 104 drives rear roller 122 (or alternatively front roller 120 ) causing conveyor belt 124 to rotate rear-to-front.
- a portion of ice cube molds 126 face generally upward during ice cube 128 formation.
- conveyor belt 124 rotates forward over front roller 120
- a portion of ice cube molds 126 face generally downward and ice cubes 128 frozen within are gravity fed into first ice cube storage bin 112 .
- first ice cube storage bin 112 is disposed within freezer door 36 .
- First ice cube storage bin 112 can be molded directly into freezer door assembly 36 or first ice cube storage bin 112 can be fixedly attached to or removeably disposed within a portion of freezer door assembly 36 .
- a harvester bar 129 is positioned adjacent to front roller 120 so as to contact a portion of each respective ice cube 128 (as ice cube molds 126 rotate forward over front roller 120 ) and assist ice cubes 128 to eject from ice cube molds 126 .
- front roller 120 is aligned with a top portion 130 of first ice cube storage bin 112 (when freezer door 36 is in a closed position) such that ice cubes 128 frozen within conveyor belt 124 are gravity fed into first ice cube storage bin 112 as conveyor belt 124 rotates forward over front roller 120 .
- Refill valve 110 is positioned within freezer compartment 12 generally positioned above at least one and typically a row 132 of ice cube molds 126 .
- Refill valve 110 is actuated when a belt position sensor 133 (optical, mechanical, proximity switch or the like) generates a signal to controller 116 indicating that belt 124 is in the correct position for refill.
- belt position sensor 133 detects holes that are punched though a band that extends from the bottom web of conveyor belt 124 past a sidewall of a respective ice cube mold 126 .
- An IR LED positioned adjacent, typically above, the band emits light that reaches a photodiode positioned below the band only when a hole passes between the two optical devices.
- An electronic circuit determines whether the hole is present by processing the signal from the photodiode. If the hole is between the LED and the photodiode, the circuitry stops first motor 104 and commences a water dose.
- refill valve 110 is positioned within a machine or mechanical compartment (not shown).
- An outlet tubing 134 from refill valve 110 enters freezer compartment 12 from a rear wall of the liner 18 .
- a fill tube 136 connected to outlet tube 134 delivers water to a respective row 132 of ice cube molds 126 at a portion of belt 124 , typically adjacent to rear roller 122 .
- refill valve 110 is a doser mechanism 150 consisting of a rotary multiport valve 152 and a doser housing 154 , as shown in FIG. 4.
- Doser housing 154 consists of an enclosed volume of about 10-50 ml divided into a first section 156 and a second section 158 by a flexible diaphragm 160 .
- Tubing to rotary valve 152 connects ports on each section 156 , 158 of doser housing 154 .
- Tubing to the inlet also connects rotary valve 152 and outlet ports of a water filter 162 , an icemaker fill tube 164 , a water dispenser tube 166 and a water supply 168 .
- valve 152 simultaneously connects the port from water supply 168 (or alternatively water filter 162 outlet, if used) to first section 156 of doser housing 154 , and ice maker fill tube 164 to second section 158 of doser housing 154 .
- the pressure of water supply 168 pushes flexible diaphragm 160 displacing the water in second section 158 of doser housing 154 to fill tube 164 .
- rotary valve 152 is moved to connect water supply 168 (or alternatively water filter 162 outlet) to second section 158 of doser housing 154 , and simultaneously connect first section 156 of doser housing 154 with icemaker fill tube 164 .
- Water supply 168 pressure forces diaphragm 160 back across doser housing 154 displacing the water in first section 156 of doser housing 154 to fill tube 164 .
- Finally rotary valve 152 is moved to isolate water supply 168 from the system.
- Second motor 106 (FIG. 2) is positioned within freezer door 36 and is drivingly coupled to ice crusher 108 , which ice crusher 108 either crushes ice cubes 128 or delivers whole ice cubes 128 depending on the user selection.
- An end user by means of a push button 138 , or similar actuation device selectively controls second motor 106 .
- Second ice cube storage bin 114 is typically removably disposed within freezer door 36 .
- Second ice cube storage bin 114 is typically an optional supplemental storage bin as first ice cube storage bin 112 is the primary ice storage bin.
- Second ice cube storage bin 114 is typically disposed in a lower portion 140 of freezer door 36 , below first ice cube storage bin 112 and below ice crusher 108 .
- Second ice cube storage bin 114 is typically removable and as such, when removed, its space within door 36 can be used for storing other items.
- a detection sensor 147 is used.
- detection sensor 147 is a microswitch that is actuated by a special geometrical feature of second ice cube storage bin 114 , such as a pin or a tab.
- detection sensor 147 could be an inductive proximity sensor that detects a metal insert on second ice cube storage bin 114 , or an optical sensor that detects a reflecting surface adhered to second ice cube storage bin 114 , or the like.
- First motor 104 is energized when the fullness of ice cubes 128 in first ice cube storage bin 112 falls below a preset fill level and an ice-ready sensor 142 generates a signal to controller 116 that a respective row 132 of ice cubes 128 to be delivered is frozen. If a first fullness sensor 144 disposed within or about first ice cube storage bin 112 generates a signal to controller 116 that the level of ice cubes 128 within first ice cube storage bin 112 has dropped below a preset fill level, a cycle is initiated and first motor 104 advances conveyor belt 124 one full row 132 of ice cube molds 126 and refill valve 110 delivers water to a row of empty molds 126 .
- ice-ready sensor 142 is a temperature sensor such as a thermistor or a thermocouple in sliding contact with belt 124 adjacent front roller 120 where ice cubes 128 are delivered.
- a temperature sensor such as a thermistor or a thermocouple in sliding contact with belt 124 adjacent front roller 120 where ice cubes 128 are delivered.
- various algorithms can be used to determine ice readiness from a temperature sensor. Time and temperature can be integrated to provide a degree-minute set point beyond which it is known that the ice is frozen. Alternatively a temperature cutoff can be used below which it is known that the ice is frozen. This temperature cutoff will typically be about 15° F.
- Another ice-ready sensor 142 is based on capacitance.
- the capacitance sensor is positioned below belt 124 near front roller 120 .
- the sensor is part of a capacitance bridge circuit.
- An excitation frequency is applied to the bridge.
- the bridge is balanced such that when a respective ice cube mold 126 is empty the voltage across the bridge is nearly zero.
- the capacitance reading of ice-ready sensor 142 increases dramatically, because the dielectric constant of water is about 80 times that of air, causing the bridge to become unbalanced.
- the voltage signal sensed by controller 116 increases dramatically when water is in a respective ice cube mold 126 .
- the dielectric constant decreases to about 6 times that of air, reducing the imbalance of the bridge and decreasing the signal sent by ice-ready sensor 142 to controller 116 .
- the bridge can be balanced such that the output is nearly zero when water is present in the mold, in which case the bridge becomes more unbalanced when the water freezes, and a large output indicates that the ice is ready.
- a second fullness sensor 146 disposed within or about second ice cube storage bin 114 generates a signal to controller 116 that the level of ice cubes 128 within second ice cube storage bin 114 has dropped below a preset fill level, a cycle is initiated and controller 116 energizes second motor 106 to rotate auger mechanism 109 disposed within first ice cube storage bin 112 . Auger mechanism 109 advances ice cubes 128 into an ice chute 148 .
- Controller generates a signal to switch a diverter 149 to block ice chute from delivering ice cubes 128 to the dispenser and to allow passage of ice cubes 128 to second ice cube storage bin 114 and ice cubes 128 are delivered to second ice cube storage bin 114 .
- fullness sensors 144 , 146 are a weight determining means such as a microswitch. In another embodiment, fullness sensors 144 , 146 are an ultrasonic level detector.
- fullness sensors 144 , 146 comprise an ultrasonic transmitter (piezo driver) 175 , an ultrasonic receiver (piezo microphone) 177 and an electronic circuit capable of causing transmitter to emit a short burst 179 (approximately 100 microseconds long) of ultrasound and capable of measuring the time interval between short burst 179 and a return echo 181 received by receiver 177 , as shown in FIG. 5.
- This time interval is proportional to the distance between fullness sensor 144 , 146 and the top layer of ice cubes 128 and is therefore a measure of the fullness of ice cube storage bin 112 , 114 .
- fullness sensors 144 , 146 comprise an optical proximity switch that detects the fullness of ice cube storage bin 112 , 114 .
- the optical switch sends out light (usually IR) and detects the reflected light intensity with a photodiode. High intensity of reflected light indicates close proximity of ice or fullness. Pulse width modulation of the IR signal can be used to increase the sensitivity of the optical switch.
- the instant invention does not use solenoid valves and has no “feeler” to determine if ice cube storage bins 112 , 114 (FIG. 2) are full, thereby avoiding the two most frequent causes of service calls. Additionally, since ice cubes 128 are not partially melted for mold release and stored in buckets that are protected from defrost air, fusing of ice cubes 128 is less likely to occur.
- a system user presses push button 138 , a signal is generated and controller 116 energizes second motor 106 and ice cubes 128 are delivered by auger mechanism 109 from first ice cube storage bin 112 to a conventional ice dispenser.
- controller 116 energizes second motor 106 and ice cubes 128 are delivered by auger mechanism 109 from first ice cube storage bin 112 to a conventional ice dispenser.
- a system user can select either crushed ice or whole cubes to be delivered (or water in most systems).
- crusher 108 activates crusher 108 and sets of rotating and stationary blades break up the cubes as the blades pass each other, and the crushed ice is delivered to the system user.
- crusher 108 is bypassed and whole ice cubes 128 are delivered to the system user.
- FIG. 6 An exemplary control logic sequence 200 (starting at block 201 ) for icemaker assembly 100 is shown in FIG. 6. This control logic sequence is inputted into controller 116 (FIG. 2), for example, by programming into memory of an application specific integrated circuit (ASIC) or other programmable memory device.
- ASIC application specific integrated circuit
- controller 116 monitors signals generated from first fullness sensor 144 . Controller 116 compares the signals generated from first fullness sensor 144 with a preset fullness value.
- the control sequence advances to block 204 . If, however, the signals generated from first fullness sensor 144 are less than the preset value (indicating low ice), the control sequence advances to block 206 .
- controller 116 monitors signals generated from ice-ready sensor 142 . Controller 116 compares the signals generated from ice-ready sensor 142 with a preset sensor value.
- first motor 104 is turned on.
- conveyor belt 124 is rotated one full row 132 of ice cube molds 126 and one full row 132 of ice cubes 128 are delivered to first ice cube bin 112 .
- the control sequence then returns to block 201 and the sequence is initiated again.
- controller 116 monitors signals generated from second fullness sensor 146 . Controller 116 compares the signals generated from second fullness sensor 146 with a preset sensor value.
- the control sequence advances to block 210 and second motor 106 is turned on.
- auger mechanism 109 is rotated and ice cubes 128 are delivered from first ice cube storage bin 112 via delivery chute 148 to second ice cube storage bin 114 .
- the control sequence then returns to block 201 and the sequence is initiated again.
- control sequence advances to block 210 and second motor 106 remains off or if previously on, second motor 106 is turned off and the control sequence returns to block 201 .
- each ice cube mold 126 within a single row 132 of flexible conveyor belt 124 is connected to the adjacent ice cube molds with deep, narrow weirs 220 , as shown in FIGS. 7 and 8. Since weirs 220 can open up without excessively stretching the mold material, as flexible conveyor belt 124 travels over each roller 120 , 122 , (FIG. 2) deep, narrow weirs 220 substantially increase the compliance of flexible conveyor belt 124 and reduce the amount of stretching required. A side view of deep, narrow weirs 220 is shown in FIG. 8.
- weir 220 is typically in the range between about 0.3 inches to about 0.75 inches deep by about 0.06 inches to about 0.25 inches wide. To prevent regions of concentrated stress, bottom 222 of weir 220 is preferably a semi-circle.
- FIGS. 9 & 10 One embodiment of ice cube molds 126 with fanfold walls 230 is shown in FIGS. 9 & 10.
- ice cube molds 126 are made from highly elastic materials (such as silicone rubber) as molds 126 are deformed, after passing front roller 120 , in order to release frozen ice cubes 128 , molds 126 tend to bend inward on an opposite side in response to being bent outward on a pair of sides. This bending causes ice cubes 128 to be gripped instead of released.
- the material comprising walls 230 is cast with alternating blades 232 coming in from both sides so that the path of continuous material follows a serpentine path in the direction that mold walls 230 are to be stretched.
- the thickness of blades 232 can be varied. Wider blades 232 , in smaller numbers, will result in a greater fraction of the path being transverse to the direction of stretch, and therefore accommodating less stretch. A larger number of blades will result in the majority of the path being transverse to the direction of the stretch, so there is more material that can straighten out.
- circumferential ridges 300 are formed on front roller 120 located under the centers 301 of each column 302 of ice cubes 128 where ice cubes 128 are to be ejected, as shown in FIG. 11. While centers 301 of ice cube molds 126 are passing over ridges 300 , sides 304 of molds are constrained to roll at the smaller radius between ridges 300 . As a result, centers 301 of mold 126 are deflected with respect to sides 304 and ice cubes 128 (FIG. 2) are ejected.
- Ice cubes 128 tend to stick tightly to most materials, and in their hard-frozen state, they lend substantial rigidity to any mold they may be frozen to. This may make it difficult to eject ice cubes 128 in a hard-frozen state. Ice cubes in automatic icemakers are usually melted by a heating element so as to produce a thin film of liquid water between the ice cubes and the molds. This film makes it easy to dislodge the ice cubes from the molds.
- bases 306 of ice cube molds 126 are affixed to the conveyor belt 124 on rectangular regions that are rigid and planar in the regions where sides 304 of molds 126 contact belt 124 , and that are somewhat flexible in the region of center 301 of mold 126 .
- the regions of belt 124 between these rectangular regions are flexible.
- the molds are not connected to belt 124 at any other place except bases 306 .
- rows 302 of molds 126 pass around front roller 120 , a generally wedged shape region opens up between adjacent rows due to the fact that the tops of the molds are at a larger radius with respect to the roller shaft than the bases.
- base regions 306 in adjacent rows will naturally want to follow a polygonal shape rather than a circle, and in a preferred embodiment, such a shape is formed into the roller in the regions where the bases are rigid and the belt tension is adjusted to assure a tight fit between the polygon shape of the belt and that in the roller.
- the region of the roller that contacts the central region of the molds is left in its original cylindrical form.
- the roller regions beneath centers 301 of molds 126 have a larger radius than the radius at which mold 301 centers would travel in an unstrained condition, and they must deform in order to travel around the roller. This deformation will break the bond between ice cubes 128 and mold 126 and eject the ice cubes 128 .
- a stiffener can be incorporated either within the sides of the molds or along an outside surface. In one embodiment (not shown) external stiffeners are used which also serve to stiffen the edges of the bases of the molds (as discussed above).
- FIG. 12 A side view diagram of another roller shape is shown in FIG. 12.
- a preferred triangular roller shape 400 is shown.
- each side of triangle 400 is shown with a bump 402 in the middle of it.
- This is actually a row of bumps whose positions correspond to the centers of ice cube molds 126 in the row.
- Ice cube molds 126 molds have at least a flexible portion 404 corresponding to the places where bumps 402 contact them so that bumps 402 can protrude into molds 126 and eject ice cubes 128 therefrom.
- bumps 402 first contact molds 126 during the cycle that advances the row to a position where the bases are vertical.
- FIG. 12 is shown with a circular roller on the right (rear roller).
- the advantage of a circular roller is that the diameter can be varied continuously to exactly achieve a desired rate of motion of the belt. Regular polygons of any desired number of sides could also have been used, and each of these would provide a specific rate of motion.
- Belt can be made of more than one material.
- an inelastic material can be used as a bottom web 500 , which is bonded to elastic material that forms a lateral web 502 and a longitudinal vertical 504 web that form the sides of the ice cubes, as shown in FIG. 13.
- An advantage of a composite construction such as this is that inelastic bottom web 500 may be stronger with regards to roller-belt friction and may provide longer life for belt 124 .
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- Engineering & Computer Science (AREA)
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- Production, Working, Storing, Or Distribution Of Ice (AREA)
Abstract
An icemaker assembly is disposed within a refrigerator having a freezer compartment, a fresh food compartment and respective freezer and fresh food door assemblies. The icemaker assembly comprises a conveyor assembly positioned within the freezer compartment having a flexible conveyor belt with a multiplicity of individual ice cube molds for creation of individual ice cubes. An ice cube storage bin is positioned below the conveyor assembly for storing the ice cubes and a fullness sensor is positioned for determining the fill level of ice cubes within the ice cube storage bin.
Description
- This application claims priority of Provisional Applications entitled “Icemaker Assembly,” by Tiemann, Voorhees & Shapiro, Ser. No. 60/158,629; Ser. No. 60/158,630; Ser. No. 60/158,631; Ser. No. 60/158,633; Ser. No. 60/158,634; and Ser. No. 60/158,636, each filed Oct. 8, 1999, which Provisional Applications are herein incorporated by reference.
- This invention relates generally to an automatic icemaker, and more specifically to an improved icemaker having a conveyor assembly.
- A conventional automatic icemaker in a typical residential refrigerator has three major subsystems: an icemaker, a bucket with an auger and ice crusher, and a dispenser insert in the freezer door that allows the ice to be delivered to a cup without opening the door.
- The icemaker is usually a metal mold that makes between six to ten ice cubes at a time. The mold is filled with water at one end and the water evenly fills the ice cube sections through weirs (shallow parts of the dividers between each cube section) that connect the sections. Opening a valve on the water supply line for a predetermined period of time usually controls the amount of water. The temperature in the freezer compartment is usually between about −10 F to about +10 F. The mold is cooled by conduction with the freezer air, and the rate of cooling is enhanced by convection of the freezer air, especially when the evaporator fan is operating. A temperature-sensing device in thermal contact with the ice cube mold generates temperature signals and a controller, monitoring the temperature signals indicates when the ice is ready to be removed from the mold. When the ice cubes are ready, a motor in the icemaker drives a rake in an angular motion. The rake pushes against the cubes to force them out of the mold. A heater on the bottom of the mold is turned on to melt the interface between the ice and the metal mold. When the interface is sufficiently melted, the rake is able to push the cubes out of the mold. Because the rake pivots on a central axis, the cross-sectional shape of the mold typically is an arc of a circle to allow the ice to be pushed out.
- After the ice is harvested, a feeler arm, usually driven by the same motor as the rake, is raised from and lowered into the storage bucket. If the arm cannot reach its predetermined low travel set point, it is assumed that the ice bucket is full and the icemaker will not harvest until more ice has been removed from the bucket. If the feeler arm returns to its low travel set point, the ice making cycle repeats.
- The ice storage bucket holds and transports ice to the dispenser in either crushed or whole cube form. If a user requests ice at the dispenser a motor drives an auger that pushes the ice to the front of the bucket where a crusher is located. The position of a door, controlled by a solenoid, determines whether or not the cubes will go through the crusher or by-pass it and be delivered as whole cubes. The crusher has sets of stationary and rotating blades that break the cubes as the blades pass each other. The crushed or whole cubes then drop into the dispenser chute.
- The dispenser chute connects the interior of the freezer with the dispenser and usually has a door, activated by a solenoid, that opens when the user requests ice. The dispenser has switches that permit the user to select crushed or whole cubes, or water to be delivered to the glass. The dispenser may have a switch that senses the presence of a glass and starts the auger motor and opens the chute door.
- Occasionally, the ice cubes that are stored in the storage bucket fuse together in large clusters of cubes. These fused clusters are much more difficult for the crusher to break up, raising the crushing design requirements for the mechanism and occasionally causing damage. Additionally, the designs of most conventional icemaker systems use substantial portions of the freezer volume, typically 25%-30%.
- Accordingly, there is a need in the art for an improved icemaker assembly.
- An icemaker assembly is disposed within a refrigerator having a freezer compartment, a fresh food compartment and respective freezer and fresh food door assemblies. The icemaker assembly comprises a conveyor assembly positioned within the freezer compartment having a flexible conveyor belt with a multiplicity of individual ice cube molds for creation of individual ice cubes. An ice cube storage bin is positioned below the conveyor assembly, for example in the freezer door, for storing the ice cubes and a fullness sensor is positioned for determining the fill level of ice cubes within the ice cube storage bin.
- FIG. 1 is a front perspective view of a side-by-side refrigerator with the access doors open;
- FIG. 2 is a part schematic side elevational view of a refrigerator including one embodiment of the instant invention;
- FIG. 3 is a part schematic side elevational view of one embodiment of a flexible conveyor belt in accordance with one embodiment of the instant invention;
- FIG. 4 is a part schematic view of another aspect of the instant invention;
- FIG. 5 is a part schematic view of another aspect of the instant invention;
- FIG. 6 is a flow chart showing one control scheme in accordance with one embodiment of the instant invention;
- FIG. 7 is a part schematic view of another aspect of the instant invention;
- FIG. 8 is a part schematic view of another aspect of the instant invention;
- FIG. 9 is a part schematic view of another aspect of the instant invention;
- FIG. 10 is a part schematic view of another aspect of the instant invention;
- FIG. 11 is a part schematic view of another aspect of the instant invention;
- FIG. 12 is a part schematic view of another aspect of the instant invention; and
- FIG. 13 is a part schematic view of another aspect of the instant invention.
- FIG. 1 is a front perspective view of a side-by-
side refrigerator 10 including afreezer compartment 12 and afresh food compartment 14.Freezer compartment 12 andfresh food compartment 14 are arranged side-by-side. A side-by-side refrigerator such asrefrigerator 10 is commercially available from General Electric Company, Appliance Park, Louisville, Ky. 40225. -
Refrigerator 10 includes anouter case 16 andinner liners case 16 andliners liners Outer case 16 normally is formed by folding a sheet of a suitable material, such as pre-painted steel, into an inverted U-shape to form the top and side walls ofcase 16. The bottom wall ofcase 16 normally is formed separately and attached to the sidewalls and to a bottom frame that provides support forrefrigerator 10.Inner liners freezer compartment 12 andfresh food compartment 14, respectively. Alternatively,liners separate liners freezer compartment 12 andfresh Food compartment 14. - A
breaker strip 22 extends between the case front flange and the outer front edges ofliners Breaker strip 22 is formed from a suitable resilient material, such as an extruded acrylo-butadiene-styrene based material (commonly referred to as ABS). - The insulation in the space between
liners resilient material 24, which is commonly referred to as the mullion.Mullion 24 is preferably formed of an extruded ABS material. It will be understood that in a refrigerator with a separate mullion dividing a unitary liner into a freezer and fresh food compartment, the front face member of that mullion corresponds to mullion 24.Breaker strip 22 andmullion 24 form a front face, and extend completely around the inner peripheral edges ofcase 16 and vertically betweenliners Mullion 24, insulation betweencompartments liners compartments -
Shelves 26 anddrawers 28 normally are provided infresh food compartment 14 to support items being stored therein. Similarly,shelves 30 andwire baskets 32 or the like are provided infreezer compartment 12. - A
freezer door 36 and a fresh food door 38 close the access openings to freezer andfresh food compartments door 36, 38 is mounted by atop hinge 40 and a bottom hinge (not shown) to rotate about its outer vertical edge between an open position, as shown in FIG. 1, and a closed position closing the associated storage compartment.Freezer door 36 typically includes a plurality ofstorage shelves 42 and fresh food door 38 typically includes a plurality ofstorage shelves 44 and abutter storage bin 46. - In accordance with one embodiment of the instant invention, an icemaker assembly100 is disposed within
freezer compartment 12, as shown in FIG. 2. - Icemaker assembly100 includes a
conveyor assembly 102, afirst motor 104 drivingly coupled toconveyor assembly 102, asecond motor 106 drivingly coupled to anice crusher 108 and anauger mechanism 109, arefill valve 110 positioned adjacent toconveyor assembly 102, a first icecube storage bin 112, an optional second icecube storage bin 114, and acontroller 116 electrically coupled tofirst motor 104 andsecond motor 106. -
Conveyor assembly 102 is positioned withinfreezer compartment 12, typically within atop portion 118 offreezer compartment 12, defined byfreezer liner 18,freezer door 36 and abaffle 117.Conveyor assembly 102 comprises at least afront roller 120 and arear roller 122 and a continuousflexible conveyor belt 124 fitted in tension about front andrear rollers flexible conveyer belt 124 is made of a flexible polymer. In illustrative examplesflexible conveyer belt 124 is made from a thermoplastic elastomer, butyl rubber, chlorobutyl rubber, natural rubber, synthetic rubber, neoprene rubber, polyurethane, ethylene-propylene-diene modified, ethylene-propylene rubber, silicone rubber or the like. Silicone rubber is particularly preferred. - A multiplicity of individual
ice cube molds 126 are disposed within or uponconveyor belt 124 for creation ofindividual ice cubes 128 therein. Typically,ice cube molds 126 are molded directly into the material offlexible conveyor belt 124. In an alternative embodiment,ice cube molds 126 are made of a rigid material and are fixedly attached toconveyor belt 124. The rigid material can be, for example, polypropylene, polyethylene, nylon, ABS, or the like. -
Flexible conveyor belt 124 dimensions can vary depending upon the size offreezer compartment 12 and the desiredice cube 128 output for a respective freezer icemaker assembly 100. Typically, a nominal linear length (l) offlexible conveyor belt 124 is in the range between about 12 inches to about 18 inches, a nominal width (w) is in the range between about 3 inches to about 8 inches and a nominal depth (d) is in the range between about 0.5 inches to about 1.5 inches, as shown in FIG. 3. - As discussed above, the number of separate
ice cube molds 126 is dependent upon the desired icemaking capacity, but a nominal number of individualice cube molds 126 is in the range between about 20 to about 300 divided into a nominal number of rows (r) in the range between about 10 to about 30 and a nominal number of columns (c) in the range between about 2 to about 10. The dimensions of an individualice cube mold 126 can vary depending on the size ofice cubes 128 desired but a nominal length (x) is in the range between about 0.75 inches to about 2 inches, and a nominal width (y) is in the range between about 0.5 inches to about 1.5 inches. Also, a variety of cube shapes can be used, including any conventional shapes as well as ornamental shapes such as fish, penguins, scallops, hemispheres, or the like. - First motor104 (FIG. 2) is drivingly coupled to
conveyor assembly 102. When energized,first motor 104 drives rear roller 122 (or alternatively front roller 120) causingconveyor belt 124 to rotate rear-to-front. A portion ofice cube molds 126 face generally upward duringice cube 128 formation. Asconveyor belt 124 rotates forward overfront roller 120, a portion ofice cube molds 126 face generally downward andice cubes 128 frozen within are gravity fed into first icecube storage bin 112. In one embodiment, first icecube storage bin 112 is disposed withinfreezer door 36. First icecube storage bin 112 can be molded directly intofreezer door assembly 36 or first icecube storage bin 112 can be fixedly attached to or removeably disposed within a portion offreezer door assembly 36. Aharvester bar 129 is positioned adjacent tofront roller 120 so as to contact a portion of each respective ice cube 128 (asice cube molds 126 rotate forward over front roller 120) and assistice cubes 128 to eject fromice cube molds 126. - As shown best in FIG. 2, the position of
front roller 120 is aligned with a top portion 130 of first ice cube storage bin 112 (whenfreezer door 36 is in a closed position) such thatice cubes 128 frozen withinconveyor belt 124 are gravity fed into first icecube storage bin 112 asconveyor belt 124 rotates forward overfront roller 120. -
Refill valve 110 is positioned withinfreezer compartment 12 generally positioned above at least one and typically arow 132 ofice cube molds 126.Refill valve 110 is actuated when a belt position sensor 133 (optical, mechanical, proximity switch or the like) generates a signal tocontroller 116 indicating thatbelt 124 is in the correct position for refill. In one embodiment,belt position sensor 133 detects holes that are punched though a band that extends from the bottom web ofconveyor belt 124 past a sidewall of a respectiveice cube mold 126. An IR LED positioned adjacent, typically above, the band emits light that reaches a photodiode positioned below the band only when a hole passes between the two optical devices. An electronic circuit determines whether the hole is present by processing the signal from the photodiode. If the hole is between the LED and the photodiode, the circuitry stopsfirst motor 104 and commences a water dose. - Typically,
refill valve 110 is positioned within a machine or mechanical compartment (not shown). Anoutlet tubing 134 fromrefill valve 110 entersfreezer compartment 12 from a rear wall of theliner 18. Afill tube 136 connected tooutlet tube 134 delivers water to arespective row 132 ofice cube molds 126 at a portion ofbelt 124, typically adjacent torear roller 122. - In one embodiment,
refill valve 110 is adoser mechanism 150 consisting of arotary multiport valve 152 and adoser housing 154, as shown in FIG. 4.Doser housing 154 consists of an enclosed volume of about 10-50 ml divided into afirst section 156 and asecond section 158 by aflexible diaphragm 160. Tubing torotary valve 152 connects ports on eachsection doser housing 154. Tubing to the inlet also connectsrotary valve 152 and outlet ports of awater filter 162, anicemaker fill tube 164, awater dispenser tube 166 and awater supply 168. - During a fill cycle,
valve 152 simultaneously connects the port from water supply 168 (or alternativelywater filter 162 outlet, if used) tofirst section 156 ofdoser housing 154, and ice maker filltube 164 tosecond section 158 ofdoser housing 154. The pressure ofwater supply 168 pushesflexible diaphragm 160 displacing the water insecond section 158 ofdoser housing 154 to filltube 164. After an appropriate amount of time fordiaphragm 160 to fully transversesecond section 158,rotary valve 152 is moved to connect water supply 168 (or alternativelywater filter 162 outlet) tosecond section 158 ofdoser housing 154, and simultaneously connectfirst section 156 ofdoser housing 154 withicemaker fill tube 164.Water supply 168 pressure forces diaphragm 160 back acrossdoser housing 154 displacing the water infirst section 156 ofdoser housing 154 to filltube 164. Finallyrotary valve 152 is moved to isolatewater supply 168 from the system. - Second motor106 (FIG. 2) is positioned within
freezer door 36 and is drivingly coupled toice crusher 108, whichice crusher 108 either crushesice cubes 128 or deliverswhole ice cubes 128 depending on the user selection. An end user by means of apush button 138, or similar actuation device selectively controlssecond motor 106. - Second ice
cube storage bin 114 is typically removably disposed withinfreezer door 36. Second icecube storage bin 114 is typically an optional supplemental storage bin as first icecube storage bin 112 is the primary ice storage bin. Second icecube storage bin 114 is typically disposed in alower portion 140 offreezer door 36, below first icecube storage bin 112 and belowice crusher 108. - Second ice
cube storage bin 114 is typically removable and as such, when removed, its space withindoor 36 can be used for storing other items. To prevent the ice maker assembly 100 from sendingice cubes 128 to second icecube storage bin 114 when second icecube storage bin 114 is not in place, adetection sensor 147 is used. In one embodiment,detection sensor 147 is a microswitch that is actuated by a special geometrical feature of second icecube storage bin 114, such as a pin or a tab. Alternatively,detection sensor 147 could be an inductive proximity sensor that detects a metal insert on second icecube storage bin 114, or an optical sensor that detects a reflecting surface adhered to second icecube storage bin 114, or the like. -
First motor 104 is energized when the fullness ofice cubes 128 in first icecube storage bin 112 falls below a preset fill level and an ice-ready sensor 142 generates a signal tocontroller 116 that arespective row 132 ofice cubes 128 to be delivered is frozen. If afirst fullness sensor 144 disposed within or about first icecube storage bin 112 generates a signal tocontroller 116 that the level ofice cubes 128 within first icecube storage bin 112 has dropped below a preset fill level, a cycle is initiated andfirst motor 104 advancesconveyor belt 124 onefull row 132 ofice cube molds 126 and refillvalve 110 delivers water to a row ofempty molds 126. - In one embodiment, ice-
ready sensor 142 is a temperature sensor such as a thermistor or a thermocouple in sliding contact withbelt 124 adjacentfront roller 120 whereice cubes 128 are delivered. Depending on the design ofbelt 124 and the airflow ofrefrigerator 10 various algorithms can be used to determine ice readiness from a temperature sensor. Time and temperature can be integrated to provide a degree-minute set point beyond which it is known that the ice is frozen. Alternatively a temperature cutoff can be used below which it is known that the ice is frozen. This temperature cutoff will typically be about 15° F. - Another ice-
ready sensor 142 is based on capacitance. The capacitance sensor is positioned belowbelt 124 nearfront roller 120. The sensor is part of a capacitance bridge circuit. An excitation frequency is applied to the bridge. The bridge is balanced such that when a respectiveice cube mold 126 is empty the voltage across the bridge is nearly zero. When water is in a respectiveice cube mold 126, the capacitance reading of ice-ready sensor 142 increases dramatically, because the dielectric constant of water is about 80 times that of air, causing the bridge to become unbalanced. Thus the voltage signal sensed bycontroller 116 increases dramatically when water is in a respectiveice cube mold 126. As the water freezes, the dielectric constant decreases to about 6 times that of air, reducing the imbalance of the bridge and decreasing the signal sent by ice-ready sensor 142 tocontroller 116. Alternatively, the bridge can be balanced such that the output is nearly zero when water is present in the mold, in which case the bridge becomes more unbalanced when the water freezes, and a large output indicates that the ice is ready. - If a
second fullness sensor 146 disposed within or about second icecube storage bin 114 generates a signal tocontroller 116 that the level ofice cubes 128 within second icecube storage bin 114 has dropped below a preset fill level, a cycle is initiated andcontroller 116 energizessecond motor 106 to rotateauger mechanism 109 disposed within first icecube storage bin 112.Auger mechanism 109 advancesice cubes 128 into anice chute 148. Controller generates a signal to switch adiverter 149 to block ice chute from deliveringice cubes 128 to the dispenser and to allow passage ofice cubes 128 to second icecube storage bin 114 andice cubes 128 are delivered to second icecube storage bin 114. - In one embodiment,
fullness sensors fullness sensors - In a preferred embodiment,
fullness sensors short burst 179 and areturn echo 181 received byreceiver 177, as shown in FIG. 5. This time interval is proportional to the distance betweenfullness sensor ice cubes 128 and is therefore a measure of the fullness of icecube storage bin - In another embodiment,
fullness sensors cube storage bin - The instant invention does not use solenoid valves and has no “feeler” to determine if ice
cube storage bins 112, 114 (FIG. 2) are full, thereby avoiding the two most frequent causes of service calls. Additionally, sinceice cubes 128 are not partially melted for mold release and stored in buckets that are protected from defrost air, fusing ofice cubes 128 is less likely to occur. - In operation, if a system user presses push
button 138, a signal is generated andcontroller 116 energizessecond motor 106 andice cubes 128 are delivered byauger mechanism 109 from first icecube storage bin 112 to a conventional ice dispenser. As with most conventional delivery systems, a system user can select either crushed ice or whole cubes to be delivered (or water in most systems). If a user selects crushed ice,ice cubes 128 are fed from first icecube storage bin 112 tocrusher 108.Second motor 106 activatescrusher 108 and sets of rotating and stationary blades break up the cubes as the blades pass each other, and the crushed ice is delivered to the system user. If a user selects whole ice cubes,crusher 108 is bypassed andwhole ice cubes 128 are delivered to the system user. - An exemplary control logic sequence200 (starting at block 201) for icemaker assembly 100 is shown in FIG. 6. This control logic sequence is inputted into controller 116 (FIG. 2), for example, by programming into memory of an application specific integrated circuit (ASIC) or other programmable memory device.
- At block202 (FIG. 6),
controller 116 monitors signals generated fromfirst fullness sensor 144.Controller 116 compares the signals generated fromfirst fullness sensor 144 with a preset fullness value. - If the signals generated from
first fullness sensor 144 are greater than or equal to the preset fullness value, the control sequence advances to block 204. If, however, the signals generated fromfirst fullness sensor 144 are less than the preset value (indicating low ice), the control sequence advances to block 206. - At
block 206,controller 116 monitors signals generated from ice-ready sensor 142.Controller 116 compares the signals generated from ice-ready sensor 142 with a preset sensor value. - If the signals generated from ice-
ready sensor 142 are outside the preset range,ice cubes 128 are not frozen. The control sequence advances to block 208 andfirst motor 104 remains off, or if previously on,first motor 104 is turned off and the control sequence returns to startingblock 201. - If, however, the signals generated from ice-
ready sensor 142 are greater than or equal to the preset value,ice cubes 128 are frozen. The control sequence advances to block 208 andfirst motor 104 is turned on. Whenfirst motor 104 is energized,conveyor belt 124 is rotated onefull row 132 ofice cube molds 126 and onefull row 132 ofice cubes 128 are delivered to firstice cube bin 112. The control sequence then returns to block 201 and the sequence is initiated again. - At
block 204,controller 116 monitors signals generated fromsecond fullness sensor 146.Controller 116 compares the signals generated fromsecond fullness sensor 146 with a preset sensor value. - If the signals generated from
second fullness sensor 146 are lower than the preset value (indicating low ice), the control sequence advances to block 210 andsecond motor 106 is turned on. Whensecond motor 106 is energized,auger mechanism 109 is rotated andice cubes 128 are delivered from first icecube storage bin 112 viadelivery chute 148 to second icecube storage bin 114. The control sequence then returns to block 201 and the sequence is initiated again. - If, however, the signals generated from
second fullness sensor 146 are greater than or equal to the preset value, the control sequence advances to block 210 andsecond motor 106 remains off or if previously on,second motor 106 is turned off and the control sequence returns to block 201. -
Ice cube molds 126 disposed withinconveyor belt 124 must stretch by a large factor asmolds 126 travel over eachroller ice cube mold 126 within asingle row 132 offlexible conveyor belt 124 is connected to the adjacent ice cube molds with deep,narrow weirs 220, as shown in FIGS. 7 and 8. Sinceweirs 220 can open up without excessively stretching the mold material, asflexible conveyor belt 124 travels over eachroller narrow weirs 220 substantially increase the compliance offlexible conveyor belt 124 and reduce the amount of stretching required. A side view of deep,narrow weirs 220 is shown in FIG. 8. For anice cube 128 roughly one inch on each side,weir 220 is typically in the range between about 0.3 inches to about 0.75 inches deep by about 0.06 inches to about 0.25 inches wide. To prevent regions of concentrated stress,bottom 222 ofweir 220 is preferably a semi-circle. - One embodiment of
ice cube molds 126 withfanfold walls 230 is shown in FIGS. 9 & 10. Whenice cube molds 126 are made from highly elastic materials (such as silicone rubber) asmolds 126 are deformed, after passingfront roller 120, in order to releasefrozen ice cubes 128,molds 126 tend to bend inward on an opposite side in response to being bent outward on a pair of sides. This bending causesice cubes 128 to be gripped instead of released. - Accordingly, in this embodiment the
material comprising walls 230 is cast with alternatingblades 232 coming in from both sides so that the path of continuous material follows a serpentine path in the direction thatmold walls 230 are to be stretched. Depending on the amount of stretch desired, the thickness ofblades 232 can be varied.Wider blades 232, in smaller numbers, will result in a greater fraction of the path being transverse to the direction of stretch, and therefore accommodating less stretch. A larger number of blades will result in the majority of the path being transverse to the direction of the stretch, so there is more material that can straighten out. In the case ofconveyor belt 124, the requirement of stretching arises from the need to go aroundrollers molds 126 is greater than what is needed at the bottom. This permits an economical design in which the depth of the zigzag varies linearly from top to bottom. - Occasionally,
ice cubes 128 cling to the molds and lend rigidity tomolds 126 resulting in ice cubes 128 (FIG. 2) not being released. In accordance with another embodiment of the instant invention,circumferential ridges 300 are formed onfront roller 120 located under thecenters 301 of eachcolumn 302 ofice cubes 128 whereice cubes 128 are to be ejected, as shown in FIG. 11. Whilecenters 301 ofice cube molds 126 are passing overridges 300,sides 304 of molds are constrained to roll at the smaller radius betweenridges 300. As a result, centers 301 ofmold 126 are deflected with respect tosides 304 and ice cubes 128 (FIG. 2) are ejected. -
Ice cubes 128 tend to stick tightly to most materials, and in their hard-frozen state, they lend substantial rigidity to any mold they may be frozen to. This may make it difficult to ejectice cubes 128 in a hard-frozen state. Ice cubes in automatic icemakers are usually melted by a heating element so as to produce a thin film of liquid water between the ice cubes and the molds. This film makes it easy to dislodge the ice cubes from the molds. - In this embodiment,
bases 306 ofice cube molds 126 are affixed to theconveyor belt 124 on rectangular regions that are rigid and planar in the regions wheresides 304 ofmolds 126contact belt 124, and that are somewhat flexible in the region ofcenter 301 ofmold 126. The regions ofbelt 124 between these rectangular regions are flexible. The molds are not connected to belt 124 at any other place exceptbases 306. Thus, whenrows 302 ofmolds 126 pass aroundfront roller 120, a generally wedged shape region opens up between adjacent rows due to the fact that the tops of the molds are at a larger radius with respect to the roller shaft than the bases. Due to the rigidity and the planarity of the regions wheresides 304 of the bases are attached to belt 124 and the flexibility ofbelt 124 between these regions,base regions 306 in adjacent rows will naturally want to follow a polygonal shape rather than a circle, and in a preferred embodiment, such a shape is formed into the roller in the regions where the bases are rigid and the belt tension is adjusted to assure a tight fit between the polygon shape of the belt and that in the roller. - In this same embodiment, the region of the roller that contacts the central region of the molds is left in its original cylindrical form. In this embodiment, there are
circumferential ridges 300 disposed onroller 120 in the regions beneathcenters 301 ofmolds 126. In both embodiments, the roller regions beneathcenters 301 ofmolds 126 have a larger radius than the radius at whichmold 301 centers would travel in an unstrained condition, and they must deform in order to travel around the roller. This deformation will break the bond betweenice cubes 128 andmold 126 and eject theice cubes 128. - It should be noted that in order to fracture the bond between the ice cube and its mold, shear must be propagated all the way up the sides of the mold. This will happen if the sides of the mold are sufficiently rigid, but if they are too flexible the deformation induced at the base may not propagate all the way to the top. In this case a stiffener can be incorporated either within the sides of the molds or along an outside surface. In one embodiment (not shown) external stiffeners are used which also serve to stiffen the edges of the bases of the molds (as discussed above).
- A side view diagram of another roller shape is shown in FIG. 12. Here a preferred
triangular roller shape 400 is shown. Note that each side oftriangle 400 is shown with abump 402 in the middle of it. This is actually a row of bumps whose positions correspond to the centers ofice cube molds 126 in the row.Ice cube molds 126 molds have at least aflexible portion 404 corresponding to the places wherebumps 402 contact them so thatbumps 402 can protrude intomolds 126 and ejectice cubes 128 therefrom. As a row ofmolds 126 advances to the front, bumps 402first contact molds 126 during the cycle that advances the row to a position where the bases are vertical. - FIG. 12 is shown with a circular roller on the right (rear roller). The advantage of a circular roller is that the diameter can be varied continuously to exactly achieve a desired rate of motion of the belt. Regular polygons of any desired number of sides could also have been used, and each of these would provide a specific rate of motion.
- Belt can be made of more than one material. For example, an inelastic material can be used as a
bottom web 500, which is bonded to elastic material that forms alateral web 502 and a longitudinal vertical 504 web that form the sides of the ice cubes, as shown in FIG. 13. An advantage of a composite construction such as this is thatinelastic bottom web 500 may be stronger with regards to roller-belt friction and may provide longer life forbelt 124. - While the invention has been described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed herein, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (92)
1. An icemaker assembly disposed within a freezer assembly, said icemaker assembly comprising
a conveyor assembly positioned within a freezer compartment of said freezer assembly, having at least a front roller and a rear roller and a continuous flexible conveyor belt fitted in tension about said front and rear rollers, said conveyor belt having a multiplicity of individual ice cube molds for creation of individual cubes therein; and
at least one ice cube storage bin positioned below said conveyor assembly for storage of said ice cubes.
2. An icemaker assembly in accordance with wherein said freezer assembly is a refrigerator having a freezer compartment and a fresh food compartment.
claim 1
3. An icemaker assembly in accordance with wherein said refrigerator is a side-by-side refrigerator.
claim 1
4. An icemaker assembly in accordance with , wherein said continuous flexible conveyor belt is made from the group consisting of thermoplastic elastomer, butyl rubber, chlorobutyl rubber, natural rubber, synthetic rubber, neoprene rubber, polyurethane, ethylene-propylene-diene modified, ethylene-propylene rubber, and silicone rubber.
claim 1
5. An icemaker assembly in accordance with , wherein said continuous flexible conveyor belt has a length in the range between about 12 in. to about 18 in.
claim 1
6. An icemaker assembly in accordance with , wherein said continuous flexible conveyor belt has a width in the range between about 3 in. to about 8 in.
claim 1
7. An icemaker assembly in accordance with , wherein said continuous flexible conveyor belt has between about 20 individual ice cube molds to about 300 individual ice cube molds.
claim 1
8. An icemaker assembly in accordance with , wherein said continuous flexible conveyor belt has between about 10 individual rows of ice cube molds and about 30 individual rows of ice cube molds.
claim 1
9. An icemaker assembly in accordance with , wherein said ice cube molds are made of a rigid material and are attached to said flexible conveyor belt.
claim 1
10. An icemaker assembly in accordance with , wherein said rigid material is selected from the group consisting of polypropylene, polyethylene, nylon, and ABS.
claim 1
11. An icemaker assembly in accordance with wherein said continuous flexible conveyor belt has between about 2 individual columns of ice cube molds and about 10 individual columns of ice cube molds.
claim 1
12. An icemaker assembly in accordance with further comprising a first motor drivingly coupled to at least one of said front or rear rollers, wherein said first motor is selectively energizable to drive said rollers and rotate said belt.
claim 1
13. An icemaker assembly in accordance with wherein the fullness of said ice cubes in said ice cube storage bin is detected by a fullness sensor.
claim 1
14. An icemaker assembly in accordance with wherein said fullness sensor is a weight determining means.
claim 13
15. An icemaker assembly in accordance with wherein said weight determining means is a microswitch.
claim 14
16. An icemaker assembly in accordance with wherein said fullness sensor is an ultrasonic level detector.
claim 13
17. An icemaker assembly in accordance with wherein each ice cube mold within a single row of flexible conveyor belt is connected to each adjacent ice cube molds with a deep-narrow weir.
claim 1
18. An icemaker assembly in accordance with wherein said flexible conveyor belt includes fanfold wells having alternating blades such that a path of continuous material follows a serpentine path in the direction that said ice cube molds are to be stretched.
claim 1
19. An icemaker assembly in accordance with further comprising a harvester bar disposed adjacent said front roller for harvesting ice cubes from said ice cube molds as said molds advance over said front roller.
claim 1
20. An icemaker assembly in accordance with further comprising a refill valve disposed within said freezer compartment and positioned above at least one of said ice cube molds.
claim 1
21. An icemaker assembly in accordance with further comprising a second motor positioned within said freezer door that is drivingly coupled to an ice crusher, which ice crusher either selectively crushes ice cubes or delivers whole ice cubes.
claim 1
22. An icemaker assembly in accordance with wherein said second motor is energized via an actuation device.
claim 1
23. An icemaker assembly in accordance with wherein said at least one ice cube storage bin is positioned within a freezer door of said freezer compartment.
claim 1
24. An icemaker assembly in accordance with wherein said storage bin is a molded plastic bin permanently disposed within said freezer door.
claim 23
25. An icemaker assembly in accordance with wherein said storage bin is a party ice container removably disposed within said freezer door.
claim 23
26. An ice cube conveyor assembly in accordance with wherein said ice cube conveyor assembly is positioned in a top portion of said freezer compartment.
claim 1
27. An ice cube conveyor assembly in accordance with wherein said ice cube conveyor assembly is disposed within a conveyor housing.
claim 26
28. An icemaker assembly disposed within a freezer compartment, having a freezer door assembly, said icemaker assembly comprising:
a conveyor assembly positioned within said freezer compartment having at least a front roller and a rear roller and a continuous flexible conveyor belt fitted in tension about said front and rear rollers, said belt having a multiplicity of individual ice cube molds for creation of individual ice cubes therein;
a first ice cube storage bin disposed within an upper portion of said freezer door assembly adjacent said front roller of said conveyor assembly, wherein said first ice cube storage bin is alignable with said conveyor assembly to receive ice cubes therefrom;
a first motor drivingly coupled to said conveyor assembly for advancing said conveyor belt;
a controller electronically coupled to said first motor; and
a second ice cube storage bin removably disposed within a lower portion of said freezer door assembly, wherein said second ice cube storage bin variably communicates with said first ice cube storage bin to receive ice cubes therefrom.
29. An icemaker assembly according to further comprising a refill valve electronically coupled to said controller to fill respective molds with water.
claim 28
30. An icemaker assembly according to further comprising a second motor, positioned within a freezer door, which second motor is drivingly coupled to an ice crusher, which ice crusher selectively crushes ice cubes or delivers whole ice cubes.
claim 28
31. An icemaker assembly according to wherein said controller generates a signal to energize said first motor when a fullness sensor is activated in relation to said first ice cube storage bin.
claim 28
32. An icemaker assembly according to wherein said flexible conveyer belt is made of a flexible polymer.
claim 28
33. An icemaker assembly according to wherein said flexible polymer is selected from the group consisting of thermoplastic elastomer, butyl rubber, chlorobutyl rubber, natural rubber, synthetic rubber, neoprene rubber, polyurethane, ethylene-propylene-diene modified, ethylene-propylene rubber, and silicone rubber.
claim 32
34. An icemaker assembly according to wherein said ice cube molds are molded directly into the material of said flexible conveyor belt.
claim 28
35. An icemaker assembly according to wherein said ice cube molds are made of a rigid material and are fixedly attached to said conveyor belt.
claim 48
36. An icemaker assembly according to wherein said rigid material can is selected from the group consisting of polypropylene, polyethylene, nylon, and ABS.
claim 35
37. An icemaker assembly according to wherein a nominal linear length (l) of said flexible conveyor belt is in the range between about 12 inches to about 18 inches.
claim 28
38. An icemaker assembly according to wherein a nominal width (w) of said flexible conveyor belt is in the range between about 3 inches to about 8 inches.
claim 28
39. An icemaker assembly according to wherein a nominal depth (d) of said flexible conveyor belt is in the range between about 0.5 inches to about 1.5 inches.
claim 28
40. An icemaker assembly according to wherein a nominal number of said individual ice cube molds is in the range between about 20 to about 300.
claim 28
41. An icemaker assembly according to wherein a nominal number of rows (r) of said ice cube molds is in the range between about 10 to about 30.
claim 28
42. An icemaker assembly according to wherein a nominal number of columns (c) of said ice cube molds in the range between about 2 to about 10.
claim 28
43. An icemaker assembly according to wherein the dimensions of an individual ice cube mold include a nominal length (x) in the range between about 0.75 inches to about 2 inches and a nominal width (y) is in the range between about 0.5 inches to about 1.5 inches.
claim 28
44. An icemaker assembly according to wherein said ice cube molds comprise a variety of ornamental cube shapes.
claim 28
45. An icemaker assembly according to wherein said ornamental cube shapes include fish, penguins, scallops, and hemispheres.
claim 44
46. An icemaker assembly according to wherein said first ice cube storage bin is molded directly into said freezer door assembly.
claim 28
47. An icemaker assembly according to wherein said first ice cube storage bin is fixedly attached to said freezer door assembly.
claim 28
48. An icemaker assembly according to wherein said first ice cube storage bin is removeably disposed within a portion of said freezer door assembly.
claim 28
49. An icemaker assembly according to further comprising a harvester bar positioned adjacent to said front roller so as to contact a portion of each respective ice cube as said ice cube molds rotate forward over said front roller to assist ice cubes to eject from said ice cube molds.
claim 28
50. An icemaker assembly according to wherein said refill valve is positioned within said freezer compartment generally positioned above at least one row of said ice cube molds.
claim 29
51. An icemaker assembly according to wherein said refill valve is actuated when a belt position sensor generates a signal to said controller indicating that said conveyor belt is in the correct position for refill.
claim 29
52. An icemaker assembly according to wherein said belt position sensor detects holes that are punched though a band that extends from a bottom web of said conveyor belt past a sidewall of a respective ice cube mold.
claim 51
53. An icemaker assembly according to wherein an IR light emitting diode positioned adjacent said band emits light that reaches a photodiode positioned below said band only when a hole passes therebetween.
claim 52
54. An icemaker assembly according to wherein said controller determines whether said hole is present by processing a signal from said photodiode and if said hole is between said light emitting diode and said photodiode said controller stops said first motor and commences a water dose.
claim 53
55. An icemaker assembly according to wherein said refill valve is a doser mechanism consisting of a rotary multiport valve and a doser housing.
claim 29
56. An icemaker assembly according to wherein said doser housing consists of an enclosed volume of about 10-50 ml divided into a first section and a second section by a flexible diaphragm.
claim 55
57. An icemaker assembly according to wherein tubing connects said rotary valve and an icemaker fill tube, a water dispenser tube and a water supply.
claim 56
58. An icemaker assembly according to wherein said valve simultaneously connects said water supply to said first section of said doser housing and said ice maker fill tube to said second section of said doser housing during a refill and the pressure of said water supply pushes said flexible diaphragm displacing the water in said second section of said doser housing to said fill tube and after an appropriate amount of time for said diaphragm to fully transverse said second section said rotary valve is moved to connect said water supply to said second section of said doser housing and simultaneously connect said first section of said doser housing with said icemaker fill tube wherein said water supply pressure forces said diaphragm back across said doser housing displacing the water in said first section of said doser housing to said fill tube.
claim 57
59. An icemaker assembly according to wherein said second ice cube storage bin is disposed in a lower portion of said freezer door below said first ice cube storage bin.
claim 28
60. An icemaker assembly according to further comprising a detection sensor is coupled to said second ice cube storage bin to prevent said ice maker assembly from sending ice cubes to said second ice cube storage bin when second ice cube storage bin is not in place.
claim 28
61. An icemaker assembly according to wherein said detection sensor is a microswitch that is actuated by a special geometrical feature of said second ice cube storage bin.
claim 60
62. An icemaker assembly according to wherein said special geometrical feature of said second ice cube storage is a pin or a tab.
claim 61
63. An icemaker assembly according to wherein said detection sensor is an inductive proximity sensor that detects a metal insert on said second ice cube storage bin.
claim 60
64. An icemaker assembly according to wherein said detection sensor is an optical sensor that detects a reflecting surface adhered to said second ice cube storage bin.
claim 60
65. An icemaker assembly according to further comprising, a first fullness sensor disposed within or about said first ice cube storage bin that generates a signal to said controller that the level of ice cubes within second ice cube storage bin has dropped below a preset fill level initiating a cycle and said controller energizes said first motor.
claim 28
66. An icemaker assembly according to wherein said first motor is energized when the fullness of ice cubes in said first ice cube storage bin falls below a preset fill level and an ice-ready sensor generates a signal to said controller that a respective row of ice cubes to be delivered is frozen and a cycle is initiated and said first motor advances said conveyor belt one full row of said ice cube molds and said refill valve delivers water to a row of said empty molds.
claim 65
67. An icemaker assembly according to wherein said ice-ready sensor is a temperature sensor in sliding contact with said belt and is positioned adjacent said front roller where ice cubes are delivered.
claim 66
68. An icemaker assembly according to wherein said temperature sensor is a thermistor or a thermocouple.
claim 67
69. An icemaker assembly according to wherein time and temperature are integrated to provide a degree-minute set point beyond which it is known that the ice is frozen.
claim 66
70. An icemaker assembly according to wherein a temperature cutoff is used below which it is known that the ice is frozen
claim 66
71. An icemaker assembly according to wherein said temperature cutoff is about 15° F.
claim 70
72. An icemaker assembly according to wherein said ice-ready sensor is a capacitance sensor positioned below said belt near said front roller so as to form part of a capacitance bridge circuit.
claim 66
73. An icemaker assembly according to wherein an excitation frequency is applied to said capacitance bridge and said bridge is balanced such that when a respective ice cube mold is empty the voltage across said bridge is nearly zero and when water is in a respective ice cube mold the capacitance reading of said ice-ready sensor increases dramatically, because the dielectric constant of water is about 80 times that of air, causing the bridge to become unbalanced. and as water freezes, the dielectric constant decreases to about 6 times that of air, reducing the imbalance of the bridge and decreasing the signal sent by said ice-ready sensor to said controller.
claim 72
74. An icemaker assembly according to wherein said fullness sensor is a weight determining means.
claim 65
75. An icemaker assembly according to wherein said weight determining means is a microswitch.
claim 74
76. An icemaker assembly according to wherein said fullness sensor is an ultrasonic level detector.
claim 65
77. An icemaker assembly according to wherein said ultrasonic level detector comprises an ultrasonic transmitter, an ultrasonic receiver and an electronic circuit capable of causing said transmitter to emit a short burst of ultrasound and capable of measuring the time interval between said short burst and a return echo received by receiver wherein this time interval is proportional to the distance between said fullness sensor and a top layer of ice cubes.
claim 76
78. An icemaker assembly according to wherein said fullness sensor comprises an optical proximity switch that detects the fullness of said second ice cube storage bin when said optical switch sends out light and detects a reflected light intensity with a photodiode such that high intensity of reflected light indicates close proximity of ice or fullness.
claim 65
79. An icemaker assembly according to further comprising a second fullness sensor disposed within or about said second ice cube storage bin that generates a signal to said controller that the level of ice cubes within second ice cube storage bin has dropped below a preset fill level initiating a cycle and said controller energizes said second motor to rotate auger mechanism disposed within said first ice cube storage bin.
claim 48
80. An icemaker assembly according to wherein said controller generates a signal to switch a diverter to block ice chute from delivering ice cubes to a dispenser and to allow passage of ice cubes to said second ice cube storage bin.
claim 79
81. An icemaker assembly according to wherein said fullness sensor is a weight determining means.
claim 79
82. An icemaker assembly according to wherein said weight determining means is a microswitch.
claim 81
83. An icemaker assembly according to wherein said fullness sensor is an ultrasonic level detector.
claim 79
84. An icemaker assembly according to wherein said ultrasonic level detector comprises an ultrasonic transmitter, an ultrasonic receiver and an electronic circuit capable of causing said transmitter to emit a short burst of ultrasound and capable of measuring the time interval between said short burst and a return echo received by receiver wherein this time interval is proportional to the distance between said fullness sensor and a top layer of ice cubes.
claim 83
85. An icemaker assembly according to wherein said fullness sensor comprises an optical proximity switch that detects the fullness of said second ice cube storage bin when said optical switch sends out light and detects a reflected light intensity with a photodiode such that high intensity of reflected light indicates close proximity of ice or fullness.
claim 83
86. An icemaker assembly comprising:
a conveyor assembly;
a first motor drivingly coupled to said conveyor assembly;
a second motor drivingly coupled to an ice crusher and an auger mechanism;
a refill valve positioned adjacent to conveyor assembly;
a first ice cube storage bin,
a removable second ice cube storage bin, and
a controller electrically coupled to said first motor and said second motor.
87. An icemaker assembly according to wherein said conveyor assembly comprises at least a front roller and a rear roller and a continuous flexible conveyor belt fitted in tension about said front and rear rollers, said conveyor belt having a multiplicity of individual ice cube molds for creation of individual cubes therein.
claim 86
88. An icemaker assembly according to , further comprising a belt position sensor that generates a signal to said controller indicating that said conveyor belt is in a correct refill position.
claim 86
89. An icemaker assembly according to , further comprising a first fullness sensor disposed within or about first ice cube storage bin that generates a signal to controller when the level of ice cubes within first ice cube storage bin falls below a preset level.
claim 86
90. An icemaker assembly according to , further comprising a second fullness sensor disposed within or about second ice cube storage bin that generates a signal to controller when the level of ice cubes within second ice cube storage bin falls below a preset level.
claim 86
91. An icemaker assembly according to , further comprising an ice ready sensor that generates a signal to controller that a respective row of ice cubes is frozen.
claim 86
92. An icemaker assembly comprising:
a means for conveying ice;
a first motor means drivingly coupled to said means for conveying;
a second motor means drivingly coupled to an ice crushing means and an auger means;
a means for refilling is positioned adjacent to said means for conveying;
a first means for storing ice,
a removable second means for storing ice, and
a means for controlling coupled to said first motor means and said second motor means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/873,991 US6438976B2 (en) | 1999-10-08 | 2001-06-04 | Icemaker assembly |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
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US15862999P | 1999-10-08 | 1999-10-08 | |
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US15863399P | 1999-10-08 | 1999-10-08 | |
US09/617,935 US7426838B1 (en) | 1999-10-08 | 2000-08-17 | Icemaker assembly |
US09/873,991 US6438976B2 (en) | 1999-10-08 | 2001-06-04 | Icemaker assembly |
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US09/617,935 Division US7426838B1 (en) | 1999-10-08 | 2000-08-17 | Icemaker assembly |
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