Dual cycle blender control means

Claim 2

A motorized device coupled to an alternating source of electrical power comprising a housing, a universal motor supported by said housing and control means comprising a plurality of field windings, rectifier means coupled to said source of electrical power, switch means comprising a first plurality of switches coupled to said windings for selectively connecting selected ones of said windings to said source of electrical power for conduction of alternating current through said selected windings and a second plurality of switches coupled to said windings for selectively connecting selected ones of said same windings to said rectifier means for conduction of direct current through said selected field windings and said rectifier means, said first and second plurality of switches being selectively actuatable so that current will flow through only one of said switches during operation of said device.

Claim 3

The motorized device of claim 1 wherein said motorized device is a blender comprising blending means coupled to said motor and further comprising range selection means comprising impedance means and means for selectively coupling said impedance means in series with said field windings in accordance with the desired speed operating range.

Claim 6

The method of claim 3 wherein the ratio of said increasing time period to said decreasing time period at blending speeds below said predetermined nominal blending speed is equal to the ratio of said decreasing time period to said increasing time period at blending speeds above said predetermined nominal blending speed.

Claim 7

The method of claim 4 wherein said ratio is approximately 315.

Claim 8

A blender coupled to a source of electrical power comprising a housing, a motor supported by said housing, blending means coupled to said motor, motor speed control means coupled to said motor and constructed to provide motor operation over a plurality of speed ranges and timing means selectively coupleable to said source of power for energization and to said motor speed control means, said timing means comprising means for intermittently deenergizing and energizing said motor in a manner such that the ratio of time that said motor is deenergized To the time that said motor is energized is different for at least two of said selected motor speed ranges.

Claim 9

A blender coupled to a source of electrical power comprising a housing, a motor supported by said housing, blending means coupled to said motor, motor speed control means coupled to said motor and constructed to provide motor operation over a plurality of speed ranges and timing means selectively coupleable to said source of power for energization and to said motor speed control means, said timing means comprising means for intermittently deenergizing and energizing said motor in a manner such that the ratio of time that said motor is deenergized To the time that said motor is energized is different for at least two of said selected motor speed ranges.

Claim 10

A blender as set forth in claim 6 having a high motor speed operating range and a low speed motor operating range wherein said timing means comprises a timing motor, camming means rotatably coupled to said timing motor, a moving contract coupled to said source of electrical power and operated by said camming means, a first stationary contact and a second stationary contact, said camming means being constructed to engage said moving contact and said first stationary contact for a first predetermined period of time and said moving contact and said stationary contact for a second predetermined period of time; said motor speed control means comprising speed range selection means comprising a plurality of contacts coupled to said motor for energizing said motor through said first stationary contact when said motor is being operated in said high motor speed operating range and through said second stationary contact when said motor is being operated in said low motor speed operating range.

Claim 11

A blender as set forth in claim 7 wherein said first predetermined period of time is longer than said second predetermined period of time.

Claim 12

A blender as set forth in claim 8 wherein said motor speed control means comprises a plurality of field windings, rectifier means coupled to said source of electrical power, switch means comprising a first plurality of switches coupled to said windings for selectively connecting selected ones of said windings to said source of electrical power for conduction of alternating current through said selected windings and a second plurality of switches coupled to said windings for selectively connecting selected ones of said same windings to said rectifier means for conduction of direct current through said selected field windings and said rectifier means, said first and said second plurality of the switches being selectively actuatable so that current will flow through only one of said switches during operation of said blender.

Claim 13

A blender as set forth in claim 9 wherein said speed range selection means comprises an impedance means and contact means for coupling said impedance means in series with said field windings when said blender is to be operated in said low motor speed operating range.