US4459523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor speed control
Assignee: Delaware Capital Formation Inc
•
Filing: 1983-03-11
•
Granted: 1984-07-10
•
Expires: 2003-03-11
Abstract
Abstract A motor speed control is disclosed herein. The speed control includes a photoelectric array and a control member situated within a housing. The photoelectric array provides a discreet, regulated voltage in accordance with the position of the control member, and a control circuit sets the motor speed based upon the level of the regulated voltage.
Inventors
- 👤 Alfred J. Evans
- 👤 Melvin L. Harrod
- 👤 Raymond H. Misner, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:12
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A speed control for a motor, operable at a speed within a speed range, comprising, in combination: a housing; a control member adapted to move with respect to said housing, said control member including a substantially non-transparent flag; a voltage source; photoelectric means, within said housing and interconnected to said voltage source, for providing a regulated voltage in accordance with the position of said control member, said photoelectric means including a series of light-emitting diodes connected to said voltage source and a series of corresponding phototransistors, said light-emitting diodes providing a continuous light pattern to control the conductive state of said corresponding phototransistors, said substantially non-transparent flag being between said light-emitting diodes and said corresponding phototransistors so as to controllably interrupt said continuous light pattern, said regulated voltage being a series of discreet voltage levels in accordance with the conductive state of said series of corresponding phototransistors; and control means, interconnecting said motor and said photoelectric means, for setting said speed of said motor in accordance with said regulated voltage.
Claim 2
Dependent Claim
170 words
A speed control for a motor, operable at a speed within a speed range, comprising, in combination: a housing; a control member adapted to move with respect to said housing, said control member including a substantially non-transparent flag; a voltage source; photoelectric means, within said housing and interconnected to said voltage source, for providing a regulated voltage in accordance with the position of said control member, said photoelectric means including a series of light-emitting diodes connected to said voltage source and a series of corresponding phototransistors, said light-emitting diodes providing a continuous light pattern to control the conductive state of said corresponding phototransistors, said substantially non-transparent flag being between said light-emitting diodes and said corresponding phototransistors so as to controllably interrupt said continuous light pattern, said regulated voltage being a series of discreet voltage levels in accordance with the conductive state of said series of corresponding phototransistors; and control means, interconnecting said motor and said photoelectric means, for setting said speed of said motor in accordance with said regulated voltage.
Claim 3
Dependent Claim
25 words
A speed control as claimed in claim 1 wherein said variable voltage means further includes a resistance network interconnected to said series of corresponding phototransistors.
Claim 4
Dependent Claim
17 words
A speed control as claimed in claim 1 wherein said control member is slideable within said housing.
Claim 5
Dependent Claim
33 words
A speed control as claimed in claim 3 wherein said control member includes a control rod extending beyond said housing, said substantially non-transparent flag being secured to said control rod within said housing.
Claim 6
Dependent Claim
18 words
A speed control as claimed in claim 1 wherein said control member rotates with respect to said housing.
Claim 7
Dependent Claim
37 words
A speed control as claimed in claim 5 wherein said control member includes a rotatable control rod extending beyond said housing, said substantially non-transparent flag being substantially disc-shaped and affixed to said control rod within said housing.
References Cited (Backward Citations)
GB921262A
Cited
US3659187A
Cited
US3859617A
Cited
US3961177A
Cited
DE2920891A1
Cited
GB2078367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |