Blender with crushed ice functionality

Abstract

Processing food items in a blender by operating the cutter assembly at a predetermined operating speed, reducing the operating speed of the cutter assembly t, and accelerating the operating speed of the cutter assembly in response to the items in the container having settled around the cutter assembly until the food items are suspended above the cutter assembly.

Claims

.[. 1. A cycle of operation for a blender comprising a motor, a container for holding items for processing, and a cutter assembly located within the container and operably coupled to the motor whereby the motor effects the rotation of the cutter assembly, the cycle comprising: automatically controlling a rotational speed of the cutter assembly to effect a pulsing of the speed of the cutter assembly wherein each pulse comprises: (A) a constant speed phase, where the operating speed of the cutter assembly is maintained at a predetermined operating speed, (B) a deceleration phase, where the speed of the cutter assembly is reduced from the operating speed to a predetermined settling speed indicative of the items in the container having settled around the cutter assembly, which is less than the operating speed and greater than zero, and (C) an acceleration phase, where the speed of the cutter assembly is increased from the settling speed to the operating speed. .].

.[. 2. The cycle according to claim 1, wherein steps A, B, and C are sequentially repeated until at least one of the cycle automatically ending and the user manually ending the cycle. .].

.[. 3. The cycle according to claim 1, wherein step A comprises maintaining the predetermined operating speed for a predetermined operating time period. .].

.[. 4. The cycle according to claim 3, wherein the predetermined operating speed is selected to comminute the items. .].

.[. 5. The cycle according to claim 4, wherein the predetermined operating time period is selected to maintain contact of the cutter assembly with the items during operation of the cutter assembly at the predetermined operating speed. .].

.[. 6. The cycle according to claim 1, wherein step B comprises continuously reducing the operating speed of the cutter assembly. .].

.[. 7. The cycle according to claim 1, wherein step B comprises terminating power to the motor to reduce the operating speed of the cutter assembly. .].

.[. 8. The cycle according to claim 7, wherein reducing the operating speed of the cutter assembly allows the items in the container to settle around the cutter assembly. .].

.[. 9. A method of processing food items in a blender, the blender comprising a motor, a container for holding items for processing, and a cutter assembly located within the container and operably coupled to the motor whereby the motor effects the movement of the cutter assembly, the method comprising: automatically controlling a rotational speed of the cutter assembly to effect a pulsing of the speed of the cutter assembly wherein each pulse comprises: (A) operating the cutter assembly in a constant speed phase, where the operating speed of the cutter assembly is maintained at a predetermined operating speed until at least some of the food items are suspended above the cutter assembly; (B) reducing the operating speed of the cutter assembly during a deceleration phase, where the speed of the cutter assembly is reduced from the operating speed to a predetermined settling speed to allow at least some of the food items to settle around the cutter assembly, wherein the settling speed is less than the operating speed and greater than zero; and (C) accelerating the operating speed of the cutter assembly during acceleration phase, where the speed of the cutter assembly is increased from the settling speed to the operating speed until the food items are suspended above the cutter assembly. .].

.[. 10. The method according to claim 9, wherein steps A, B, and C are sequentially repeated until at least one of the cycle automatically ending and the user manually ending the cycle. .].

.[. 11. The method according to claim 9, wherein step A comprises maintaining the predetermined operating speed for a predetermined operating time period. .].

.[. 12. The method according to claim 11, wherein the predetermined operating speed is selected to comminute the items. .].

.[. 13. The method according to claim 12, wherein the predetermined operating time period is selected to maintain contact of the cutter assembly with the items during operation of the cutter assembly at the predetermined operating speed. .].

.[. 14. The method according to claim 12, wherein the predetermined operating time period is selected to operate the cutter assembly until the food items are suspended above the cutter assembly. .].

.[. 15. The method according to claim 9, wherein step B comprises continuously reducing the operating speed of the cutter assembly. .].

.[. 16. The method according to claim 9, wherein step B comprises terminating power to the motor to reduce the operating speed of the cutter assembly. .].

.Iadd.17. A cycle of operation for a blender comprising a motor, a container for holding items for processing, a cutter assembly located within the container and operably coupled to the motor whereby the motor effects the rotation of the cutter assembly, and a sensor for monitoring a speed of the cutter assembly, the cycle comprising: automatically controlling a rotational speed of the cutter assembly to effect a sequencing of the speed of the cutter assembly based on monitoring the speed of the cutter assembly with the sensor, wherein each sequence comprises: (A) a constant speed phase, where the operating speed of the cutter assembly is maintained at a predetermined operating speed, (B) a deceleration phase, where the speed of the cutter assembly is reduced from the operating speed to a predetermined settling speed indicative of the items in the container having settled around the cutter assembly, which is less than the operating speed and greater than zero, and (C) an acceleration phase, where the speed of the cutter assembly is increased from the settling speed to the operating speed in response to the sensor sensing that the speed of the cutter assembly has reduced to the predetermined settling speed..Iaddend.

.Iadd.18. The cycle according to claim 17, wherein steps A, B, and C are sequentially repeated until at least one of the cycle automatically ending and the user manually ending the cycle..Iaddend.

.Iadd.19. The cycle according to claim 17, wherein step A comprises maintaining the predetermined operating speed for a predetermined operating time period..Iaddend.

.Iadd.20. The cycle according to claim 19, wherein the predetermined operating speed is selected to comminute the items..Iaddend.

.Iadd.21. The cycle according to claim 20, wherein the predetermined operating time period is selected to maintain contact of the cutter assembly with the items during operation of the cutter assembly at the predetermined operating speed..Iaddend.

.Iadd.22. The cycle according to claim 17, wherein step B comprises continuously reducing the operating speed of the cutter assembly..Iaddend.

.Iadd.23. The cycle according to claim 17, wherein step B comprises terminating power to the motor to reduce the operating speed of the cutter assembly..Iaddend.

.Iadd.24. The cycle according to claim 23, wherein reducing the operating speed of the cutter assembly allows the items in the container to settle around the cutter assembly..Iaddend.

.Iadd.25. A method of processing food items in a blender, the blender comprising a motor, a container for holding items for processing, a cutter assembly located within the container and operably coupled to the motor whereby the motor effects the movement of the cutter assembly, and a sensor for monitoring a speed of the cutter assembly, the method comprising: automatically controlling a rotational speed of the cutter assembly to effect a sequencing of the speed of the cutter assembly based on monitoring the speed of the cutter assembly with the sensor, wherein each sequence comprises: (A) operating the cutter assembly in a constant speed phase, where the operating speed of the cutter assembly is maintained at a predetermined operating speed until at least some of the food items are suspended above the cutter assembly; (B) reducing the operating speed of the cutter assembly during a deceleration phase, where the speed of the cutter assembly is reduced from the operating speed to a predetermined settling speed to allow at least some of the food items to settle around the cutter assembly, wherein the settling speed is less than the operating speed and greater than zero; and (C) in response to the sensor sensing that the speed of the cutter assembly has reduced to the predetermined settling speed, accelerating the operating speed of the cutter assembly during an acceleration phase, where the speed of the cutter assembly is increased from the settling speed to the operating speed until the food items are suspended above the cutter assembly..Iaddend.

.Iadd.26. The method according to claim 25, wherein steps A, B, and C are sequentially repeated until at least one of the cycle automatically ending and the user manually ending the cycle..Iaddend.

.Iadd.27. The method according to claim 25, wherein step A comprises maintaining the predetermined operating speed for a predetermined operating time period..Iaddend.

.Iadd.28. The method according to claim 27, wherein the predetermined operating speed is selected to comminute the items..Iaddend.

.Iadd.29. The method according to claim 28, wherein the predetermined operating time period is selected to maintain contact of the cutter assembly with the items during operation of the cutter assembly at the predetermined operating speed..Iaddend.

.Iadd.30. The method according to claim 28, wherein the predetermined operating time period is selected to operate the cutter assembly until the food items are suspended above the cutter assembly..Iaddend.

.Iadd.31. The method according to claim 25, wherein step B comprises continuously reducing the operating speed of the cutter assembly..Iaddend.

.Iadd.32. The method according to claim 25, wherein step B comprises terminating power to the motor to reduce the operating speed of the cutter assembly..Iaddend.

.Iadd.33. The cycle according to claim 17, wherein the deceleration phase comprises reducing the operating speed of the cutter assembly based on properties of the items in the blender..Iaddend.

.Iadd.34. The cycle according to claim 17, wherein the sensor is a current sensor, a Hall effect sensor, or an optical sensor..Iaddend.

.Iadd.35. The cycle according to claim 17, wherein the sensor senses that the speed of the cutter assembly has reduced from the operating speed to the predetermined settling speed and sends a proportional signal to a processor that causes a switch to apply voltage to the motor for accelerating the operating speed of the cutter assembly..Iaddend.

.Iadd.36. The cycle according to claim 23, wherein the acceleration phase comprises resupplying power to the motor in response to the sensor sensing that the speed of the cutter assembly has reduced to the predetermined settling speed..Iaddend.

.Iadd.37. The cycle according to claim 17, wherein at least one sequence comprises accelerating the speed of the cutter assembly to the operating speed in response to a determination that a predefined duration of deceleration has expired prior to the speed of the cutter assembly reducing to the predetermined settling speed..Iaddend.

.Iadd.38. The cycle according to claim 17, wherein a duration of the deceleration phase is based on properties of the items in the blender..Iaddend.

.Iadd.39. The method according to claim 25, wherein step B comprises reducing the operating speed of the cutter assembly based on properties of the food items in the blender..Iaddend.

.Iadd.40. The method according to claim 25, wherein the sensor is a current sensor, a Hall effect sensor, or an optical sensor..Iaddend.

.Iadd.41. The method according to claim 25, wherein the sensor senses that the speed of the cutter assembly has reduced from the operating speed to the predetermined settling speed and sends a proportional signal to a processor that causes a switch to apply voltage to the motor for accelerating the operating speed of the cutter assembly..Iaddend.

.Iadd.42. The method according to claim 32, wherein step C comprises resupplying power to the motor in response to the sensor sensing that the speed of the cutter assembly has reduced to the predetermined settling speed..Iaddend.

.Iadd.43. The method according to claim 25, wherein at least one sequence comprises accelerating the speed of the cutter assembly to the operating speed in response to a determination that a predefined duration of deceleration has expired prior to the speed of the cutter assembly reducing to the predetermined settling speed..Iaddend.

.Iadd.44. The method according to claim 25, wherein a duration of the deceleration phase is based on properties of the items in the blender..Iaddend.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of an embodiment of a blender according to the invention comprising a container and a motor-driven cutter assembly for processing food items.

(2) FIG. 2 is a schematic view of a control system for the blender illustrated in FIG. 1.

(3) FIG. 3 is a perspective partial view of the blender illustrated in FIG. 1 showing food items in a settled condition in the container.

(4) FIG. 4 is a perspective partial view of the blender illustrated in FIG. 1 showing food items in a suspended condition in the container.

(5) FIG. 5 is a graphical representation of the speed of the motor for a no-load condition of food items in the container.

(6) FIG. 6 is a graphical representation of the speed of the motor for a loading condition of food items in the container.

DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

(7) Referring now to FIG. 1, an embodiment of the invention is illustrated comprising a blender 10. The blender 10 has standard elements common in the art, as disclosed in U.S. Pat. No. 6,092,922, which is incorporated fully herein by reference. These common elements will not be described in detail except as necessary for a full understanding of the invention.

(8) The blender 10 comprises an open-top container 12 and a base 14. The container 12 comprises an upwardly-extending perimeter wall 22 from which extends a handle 20 to assist a user in maneuvering the container 12 during use. A lid 18 closes the top of the container 12. The perimeter wall 22 transitions to a downwardly-extending annular skirt 24. Separating the perimeter wall 22 and the annular skirt 24 is a bottom wall (not shown) generally orthogonal to the axis of the perimeter wall 22 and the annular skirt 24

(9) The container 12 defines a chamber 16 adapted to hold a food item (FIG. 3). A food processing assembly, e.g. a rotating cutter assembly 32, for processing food items in the chamber 16 is mounted in an aperture in a bottom wall of the container 12 so that a first blade portion of the cutter assembly 32 extends into the chamber 16 and a second drive shaft portion of the cutter assembly 32 extends through the bottom wall of the container 12 into the interior of the annular skirt 24. The cutter assembly 32 comprises a plurality of mixing blades to facilitate mixing, liquefying, chopping, processing, etc., of food items as the cutter assembly 32 rotates. The drive shaft portion is rotatably mounted in the bottom wall of the container 12 and is adapted for coupling with an output shaft of a drive motor (not shown) housed in the base 14.

(10) The base 14 comprises a base housing 26 having a control panel 28. The base housing 26 transitions upwardly to a container pedestal 30 adapted for cooperative registry with the skirt 24 when the container 12 is seated on the base 14. A motor 54 (FIG. 2) is located within the base housing 26. The motor 54 is operably coupled to the cutter assembly 32 for driving the cutter assembly 32. This can be accomplished by the motor 54 having an output shaft that is coupled to the cutter assembly 32. Seating of the container 12 on the container pedestal 30 will couple the output shaft of the drive motor 54 with the drive shaft portion of the cutter assembly 32.

(11) The control panel 28 can comprise an array of switches 34, lights 36, and a display panel 38 to enable a user to select an operational parameter, such as an on and off switch 48, speed, or time, select a processing function, such as chopping, liquefying, or crushing, and/or monitor a parameter, such as a selected function, time, or speed. The control panel 28 can also comprise a switch 40 for selecting an ice crushing function according to the invention, as described more fully hereinafter.

(12) The switches 34, 40, 48 can comprise toggle switches, push-button switches, membrane or tactile switches, and the like. The lights 36 can comprise incandescent bulbs, LEDs, and the like.

(13) FIG. 2 illustrates in schematic form a control system 50 for the ice crushing function. The control system comprises a microprocessor 52 operably coupled with a well-known triac switch 56 for controlling the on and off states of the motor 54. The motor 54 is supplied with power from a suitable power supply 60. The speed of the motor 54 is monitored through a suitable, well-known sensor, such as a Hall effect sensor coupled with the motor 54 for determining the motor shaft speed in RPM. Alternatively, the speed of the motor 54 can be monitored through a well-known current sensor coupled with the motor power input, an optical sensor coupled with the motor shaft, or some other motor performance feedback device.

(14) The processor 52 is adapted with a preprogrammed cycle for controlling the motor 54 through the triac switch 56 to provide a pulsed on/off operation of the motor 54, as hereinafter described.

(15) FIG. 3 illustrates the condition of the contents of the container 12 when the motor 54 is in the off state. For illustrative purposes, the contents are assumed to comprise a liquid fraction 42 and solid particles 44, such as ice cubes. In the off state, the solid particles 44 will accumulate at the bottom of the chamber 16 around the cutter assembly 32 into a settled condition. Thus, when the motor 54 is triggered into the on state, the comminuting effect of the cutter assembly 32 on the solid particles 44 will be optimized.

(16) FIG. 4 illustrates the condition of the contents of the container 12 when the motor 54 is in the on state, i.e. during a predetermined operating time period. In this condition, the solid particles 44 are suspended in the liquid fraction 42, which is characterized by a vortex 46 caused by the spinning of the cutter assembly 32. The vortex 46 causes the solid particles 44 to migrate away from the cutter assembly 32 and, depending in part on the relative proportion of the liquid fraction 42, to be urged against the perimeter wall 22, in a suspended condition. At some time after the initiation of the on state, the solid particles 44 will have migrated away from the cutter assembly 32, which will no longer comminute the solid particles 44. This time is equivalent to the predetermined operating time period.

(17) FIG. 5 illustrates a no-load curve 70 for this process in which there are no contents in the container 12, or a relatively small quantity and/or loose consistency of the contents. For illustrative purposes in FIGS. 5 and 6, 6000 RPM represents a predetermined operating speed, and 1120 RPM represents a speed at which solid particles have accumulated into the settled condition, i.e. a predetermined settling speed. 0.5 second represents the predetermined operating time period, and 4 seconds represents a predetermined deceleration time period during which solid particles have accumulated into the settled condition.

(18) Upon the operation of the crush ice switch 40, the motor 54 will be accelerated 72 from the off state to the predetermined operating speed, such as 6000 RPM, and maintained at this speed for the predetermined operating time period, such as 0.5 second 74. Upon the expiration of the predetermined operating time period, power to the motor 54 will be terminated by the triac switch 56 under the control of the processor 52 to deactivate the motor 54 to the off state, and the motor 54 will be allowed to decelerate 76 toward the predetermined settling speed, such as 1120 RPM. Since the rotation of the cutter assembly 32 will be relatively unimpeded by the contents of the container 12, the motor speed may not reach the predetermined settling speed within the predetermined deceleration time period of 4 seconds. Upon the expiration of the predetermined deceleration time period, the triac switch 56 will deliver power to return the motor 54 to the on state, the motor 54 will re-accelerate 78 to the predetermined operating speed, and will be maintained at this speed 80 for the predetermined operating time period. Upon the expiration of the predetermined operating time period, the motor 54 will again be returned to the off state by the triac switch 56 under the control of the processor 52, and allowed to decelerate 82 toward the predetermined settling speed, or, if the crush ice switch 40 has been actuated, toward a speed of 0 RPM. The on/off sequence is repeated until the user activates the crush ice switch 40 or the on/off switch 48 to terminate the operation.

(19) At some point in the process, deceleration of the motor to the predetermined settling speed may occur prior to the expiration of the predetermined deceleration time period, as described above. In such a case, power will be restored to the motor 54 upon the motor reaching the predetermined settling speed, and the motor 54 will again accelerate to the predetermined operating speed, to repeat the on/off process. This condition is illustrated in FIG. 6.

(20) FIG. 6 illustrates a load curve at 90 for the process in which the contents of the container 12 are of a consistency that enables the motor RPM to decelerate to a speed of 1120 RPM in less than 4 seconds after termination of power to the motor 54. Thus, upon the operation of the crush ice switch 40, the motor 54 will be accelerated 92 from the off state to a predetermined operating speed of 6000 RPM, and maintained at this speed for a predetermined operating time period of 0.5 second 94. Upon the expiration of the predetermined 0.5 second, the motor 54 will be deactivated to the off state, and allowed to decelerate 96 toward the predetermined settling speed of 1120 RPM. Since the rotation of the cutter assembly 32 will be relatively impeded by the contents of the container 12, the motor speed will rotate at a speed in excess of 1120 RPM after 4 seconds has expired. Upon reaching 1120 RPM, the motor 54 will be returned to the on state, will reaccelerate 98 to 6000 RPM, and will be maintained at this speed 100 for 0.5 second. Again, upon the expiration of 0.5 second, the motor 54 will be deactivated to the off state, and allowed to decelerate 102 toward 1120 RPM. The process of acceleration 104, maintenance of the 6000 RPM speed 106, and deceleration 108 toward the 1120 RPM speed will be maintained until the crush ice switch 40 or the on/off switch 48 is actuated to terminate the process.

(21) The predetermined operating speed, predetermined settling speed, predetermined operating time period, and predetermined deceleration time period are functions of the blender motor size, the cutter assembly configuration, the container size and configuration, the properties such as hardness and viscosity of the items to be processed in the blender, and the like, and are selected to optimize the effectiveness of the pulsing process. Thus, these speeds and time periods will vary for different blenders, and must be determined empirically for a particular blender. The description following will be based upon a blender having a predetermined operating speed of 6000 RPM, a predetermined settling speed of 1120 RPM, a predetermined operating time period of 0.5 seconds, and a predetermined deceleration time period of 4 seconds.

(22) When the motor 54 is returned to the off state, the solid particles 44 will migrate to the bottom of the chamber 16, to accumulate around the cutter assembly 32 in the settled condition. The maximum time period for this migration of solid particles 44 into the settled condition is equivalent to the predetermined deceleration time period. However, depending on the properties of the solid particles 44, the cutter assembly 32, the motor 54, the container 12, and other properties of the blender 10, the settled condition may be reached prior to the expiration of the predetermined deceleration time period, as indicated by the slowing of the motor 54 to the predetermined settling speed. In either case, the motor 54 will be triggered into the on state when the solid particles 44 are in the settled condition, thereby optimizing the comminuting effect of the cutter assembly 32 on the solid particles 44.

(23) The feedback sensor can indicate in a well-known manner whether one of two conditions has occurred, i.e. whether the motor speed has dropped below 1120 RPM, or whether voltage to the motor has been removed for 4 consecutive seconds.

(24) As ingredients (such as ice) settle within the chamber 16, the load on the cutter assembly 32 will cause the motor speed to drop-off relatively rapidly. The feedback sensor 58 will sense this drop off, and will generate a proportional signal to the processor 52, which will cause triac switch 56 to apply voltage to the motor 54 for repeating the cycle. As ingredients in the chamber 16 are comminuted and mixed, the load on the cutter assembly will drop and will trend back to the no-load condition. To end the cycling, the consumer can either switch the blender to the off state, or actuate a speed switch, at which time the blender will exit the crush ice function to operate at the selected speed.

(25) The on time, the on speed, and the RPM threshold have been selected in order to optimize crush ice performance and simulate a person crushing ice by cycling a pulse button. It has been found that a user will typically hold the pulse button only for a short period of time (e.g. 0.5 sec) and at a speed that will crush ice (i.e. 6000 RPM). The user will then release the pulse switch to allow the ingredients to settle back down to the bottom of the chamber 16 to start the process over.

(26) Rather than a fixed period of time between on pulses, the off time is variable, and based on the contents of the blender. The heavier the load, the quicker the contents will settle, the quicker the cutters will slow down, and the quicker the contents will be ready to be processed again.

(27) The motor 54 and cutter assembly 32 speed does not return all the way to 0 RPM before repeating the process, in part, because the additional time to reach 0 RPM and reaccelerate from 0 RPM to the preselected operating speed does not improve comminuting performance and only slows the entire process. 1120 RPM represents for a particular blender configuration a cutter assembly speed that slows significantly enough to allow the contents to reach the settled condition to be processed again.

(28) The 0.5 sec predetermined operating time period and the 6000 RPM predetermined operating speed represent an optimization of the pulsing feature. During a pulsing operation, the crushing of ice, or any other ingredients, is primarily effective only during the beginning of the cycle. After the initial acceleration of the cutter assembly, the ingredients are tossed away from the cutter assembly and are no longer effectively comminuted and blended. 0.5 second represents a time period during which the comminuting action of the cutter assembly is optimized.

(29) The predetermined operating speed has a similar effect. If the speed is too high, the contents are thrown away from the cutter assembly too quickly, resulting in poor comminuting and blending performance. If the speed is too low, insufficient work is performed on the contents, also resulting in poor comminuting and blending performance. 6000 RPM represents a predetermined operating speed for which the comminuting action of the cutter assembly is optimized.

(30) The blender described herein provides a variable cycling of a crush ice pulsing pattern, which is different than the repeating time-based pulsing pattern of conventional blenders. The variable pulsing process better simulates how a user manually achieves the comminuting and blending effect when operating the on/off switch on a blender. If a user is crushing ice cubes or other solid food items by cycling a conventional pulse switch or on/off switch, they will rely on visual feedback from observing the blending operation to adjust their operation pattern. A user manually operating the pulse or on/off switch will observe the ingredients and, after sending a quick pulse to comminute the ingredients, will observe the ingredients settle back down around the cutter assembly, indicating the need for the next quick pulse. As the ingredients become processed the pulsing pattern will quicken, with shorter off times between the quick pulses. With the use of speed feedback between the motor/cutter assembly and the blender control system the blender can sense when the cutter assembly is slowing down, an indication that the ingredients are settling. Once a predetermined degree of settling has been reached, as indicated by the rotation speed of the motor/cutter assembly, the preprogrammed routine can control the next pulse burst to the motor. The speed and duration of the on time can be optimized for the intended blender based on container design, capacity, motor power, and cutter assembly configuration.

(31) While the invention has been specifically described in connection with certain specific embodiments thereof, it is to be understood that this is by way of illustration and not of limitation. Reasonable variation and modification are possible within the scope of the forgoing disclosure and drawings without departing from the spirit of the invention which is defined in the appended claims.