US3630495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixer unit
Assignee: Individual
•
Filing: 1970-11-12
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Granted: 1971-12-28
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Expires: 1990-11-12
Abstract
Abstract A variable speed mixer compensates for variations in the viscosity of a material being mixed. An electric motor drives a differential with two outputs. One output is connected to a mixer shaft and another to a variable impedance. The variable impedance varies the speed of the mixer shaft in response to the load on the shaft, thereby maintaining the torque applied to the shaft at a constant level and controlling the differential to provide a constant load on the electric motor.
Inventors
- 👤 Walter N Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:05
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/20; B01F35/21; B01F35/212; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2506
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
145 words
In a variable speed mixer for mixing variable viscosity material, which mixer includes a mixer shaft with attached turbine blades which in use are immersed in the material to be mixed, and which mixer further includes means for automatically compensating mixer shaft speed for viscosity variations of the material, the improvement comprising: an electrical motor operating at a constant speed, differential means having an input connected to be driven at said constant speed by said motor, a first differential output connected to drive said mixer shaft, and a second differential output, and variable impedance means operatively connected to said second output of said differential means for varying the speed of the mixer shaft in response to the load on the mixer shaft, thereby maintaining the torque applied to said mixer shaft constant and controlling the differential means to provide a constant load on said mOtor.
Claim 2
Dependent Claim
145 words
In a variable speed mixer for mixing variable viscosity material, which mixer includes a mixer shaft with attached turbine blades which in use are immersed in the material to be mixed, and which mixer further includes means for automatically compensating mixer shaft speed for viscosity variations of the material, the improvement comprising: an electrical motor operating at a constant speed, differential means having an input connected to be driven at said constant speed by said motor, a first differential output connected to drive said mixer shaft, and a second differential output, and variable impedance means operatively connected to said second output of said differential means for varying the speed of the mixer shaft in response to the load on the mixer shaft, thereby maintaining the torque applied to said mixer shaft constant and controlling the differential means to provide a constant load on said mOtor.
Claim 3
Dependent Claim
79 words
The improvement of claim 1 wherein the differential means comprises meshing sun and planetary gears with a rotatable ring gear means meshing with said planetary gears, said sun and planetary gears connected between said motor and said mixer shaft, and said ring gear means connected to said variable impedance means for controlling the rate of rotation of the planetary gears about the sun gear and in turn the speed of said mixer shaft as a function of said viscosity.
Claim 4
Dependent Claim
35 words
The improvement of claim 2 wherein said sun gear is driven by said motor, and said planetary gears are rotatably spindled to a plate, said mixer shaft being connected to receive motion from said plate.
Claim 5
Dependent Claim
49 words
The improvement of claim 2 wherein said variable impedance means comprises a first hydraulic pump having a driving input connected to be driven by said ring gear means, a fluid input, and a fluid output with valve means for variably retarding said pump and thereby said ring gear means.
Claim 6
Dependent Claim
33 words
The improvement of claim 4 wherein said valve means includes a throttling valve for controlling the speed of the mixer shaft and a relief valve for controlling the maximum retardation of said pump.
Claim 7
Dependent Claim
24 words
The improvement of claim 5 wherein said throttle valve and said relief valve are connected in parallel to said fluid output of said pump.
Claim 8
Dependent Claim
45 words
The improvement of claim 4 further comprising a second hydraulic pump for supplying fluid under pressure to said fluid input of said first pump to facilitate initial rotary movement of said ring gear in response to increased loading of said mixer shaft via said blades.
Claim 9
Dependent Claim
48 words
The improvement of claim 1 wherein said variable impedance means comprises a first hydraulic pump having a driving input connected to be driven by said second output, a fluid input, and a fluid output with valve means for variably retarding said pump and thereby said ring gear means.
Claim 10
Dependent Claim
33 words
The improvement of claim 8 wherein said valve means includes a throttling valve for controlling the speed of the mixer shaft and a relief valve for controlling the maximum retardation of said pump.
Claim 11
Dependent Claim
24 words
The improvement of claim 9 wherein said throttle valve and said relief valve are connected in parallel to said fluid output of said pump.
Claim 12
Dependent Claim
44 words
The improvement of claim 8 further comprising a second hydraulic pump for supplying fluid under pressure to said fluid input of said first pump to facilitate initial movement of said second output in response to increased loading of said mixer shaft via said blades.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |