US4093853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotational speed transducers
Assignee: Associated Engineering Ltd
•
Filing: 1977-02-22
•
Granted: 1978-06-06
•
Expires: 1997-02-22
Abstract
Abstract A rotational speed transducer comprises a member which is mounted to rotate at a speed related to a rotational speed input. A lamp and a photocell are mounted in relation to the rotatable member such that light from the lamp is only reflected by the rotatable member toward the photocell each time a reflector portion or portions of the rotatable member comes into a particular position or positions with respect to the lamp so as to provide an electrical output, from the photocell, which is a measure of the rotational speed input. The reflector portions may be portions of a disc which constitutes the rotatable member.
Inventors
- 👤 Norman Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:59
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/486; G01P1/00; G01P1/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
A rotational speed transducer comprising: rotatable means; means mounting said rotatable means such that it can rotate at a speed related to a rotational speed input; said rotatable means having a plurality of light reflector portions; means mounting said plurality of reflector portions at an angle to the axis of rotation of said rotatable means; lamp means for emitting light; photocell means for receiving light from said lamp means and providing an electrical output in response thereto; and means mounting said lamp means and said photocell means in relation to said rotatable means whereby to reflect light emitted by said lamp means from a first reflector portion to a second reflector portion and from said latter portion to said photocell means each time said first reflector portion comes into a given relation with said lamp means, as said rotatable means rotates, thereby to provide from said photocell means an electrical output which is a measure of the rotational speed input.
Claim 2
Dependent Claim
160 words
A rotational speed transducer comprising: rotatable means; means mounting said rotatable means such that it can rotate at a speed related to a rotational speed input; said rotatable means having a plurality of light reflector portions; means mounting said plurality of reflector portions at an angle to the axis of rotation of said rotatable means; lamp means for emitting light; photocell means for receiving light from said lamp means and providing an electrical output in response thereto; and means mounting said lamp means and said photocell means in relation to said rotatable means whereby to reflect light emitted by said lamp means from a first reflector portion to a second reflector portion and from said latter portion to said photocell means each time said first reflector portion comes into a given relation with said lamp means, as said rotatable means rotates, thereby to provide from said photocell means an electrical output which is a measure of the rotational speed input.
Claim 3
Dependent Claim
47 words
A transducer as claimed in claim 1, wherein said reflector portions are mounted at substantially 45° to said axis of rotation of said rotatable means, and said lamp means and photocell means have their optical axes substantially parallel to one another and to said axis of rotation.
References Cited (Backward Citations)
US3231807A
Cited
GB1097528A
Cited
US3846701A
Cited
US3811056A
Cited
FR2245950A1
Cited
US3942112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |