Patent US3668491A successfully refreshed from Google Patents.
US3668491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery powered liquidizer
Assignee: Dynamics Corp of America
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Filing: 1969-10-15
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Granted: 1972-06-06
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Expires: 1989-10-15
Abstract
Abstract A portable multi-speed liquidizer operable from low voltage alternating or direct current is speed-controlled by a push button switch assembly, which also serves to select the power source for the liquidizer motor. The maximum current switched by any one contact of the assembly is reduced during speed changes by automatically switching the lowest impedance motor field coil into the circuit immediately preceding and during each speed change.
Inventors
- 👤 Raymond F Kelley
- 👤 Roy L Swanke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:33
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/282
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
In a speed control for a fractional horsepower universal motor having at least two field coils of different impedances, the combination of: a first connection including a first switch having a movable conductor between two of the coils to connect the coils in series, a second connection between the two coils including a second switch having a movable conductor to shunt one of the coils and said first switch, a third connection between the two coils including a third switch having a movable conductor to shunt the other of the coils and said first switch, means comprising a plurality of push buttons for controlling said movable switch conductors to establish different interconnections between said field coils one of said push buttons closing said second and third switch conductors and opening said first switch conductor concurrently, and means for momentarily closing said second switch conductor while either one of the other switch conductors is being closed to reduce the maximum current being switched by said conductors.
Claim 2
Dependent Claim
165 words
In a speed control for a fractional horsepower universal motor having at least two field coils of different impedances, the combination of: a first connection including a first switch having a movable conductor between two of the coils to connect the coils in series, a second connection between the two coils including a second switch having a movable conductor to shunt one of the coils and said first switch, a third connection between the two coils including a third switch having a movable conductor to shunt the other of the coils and said first switch, means comprising a plurality of push buttons for controlling said movable switch conductors to establish different interconnections between said field coils one of said push buttons closing said second and third switch conductors and opening said first switch conductor concurrently, and means for momentarily closing said second switch conductor while either one of the other switch conductors is being closed to reduce the maximum current being switched by said conductors.
Claim 3
Dependent Claim
28 words
The combination called for in claim 1 in which one of the push buttons opens said second and third switch conductors and closes said first switch conductor concurrently.
Claim 4
Dependent Claim
33 words
The combination called for in claim 2 in which another push button of said switch control means controls said switch conductors to close the second switch while opening said first and third switChes.
Claim 5
Dependent Claim
33 words
The combination called for in claim 2 in which another push button of said switch control means controls said switch conductors to close the third switch while opening said first and second switches.
Claim 6
Dependent Claim
36 words
The speed control described in claim 1 wherein said permutating switch contacts are ra ted to carry only the current consumed by said coils, and said second connection shunts the field coil having the higher impedance.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |