US3557660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed sensing and controlling apparatus
Assignee: ZF International UK Ltd
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Filing: 1968-10-30
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Granted: 1971-01-26
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Expires: 1988-10-30
Abstract
Abstract Apparatus for sensing and controlling the speed of a rotating part comprising means for providing a pulsating fluid pressure related to the speed of the part, two devices to which the pulsating pressure is applied, said devices being capable of vibrating at different resonant frequencies, two passage means communicating with a common supply means of the fluid at a steady pressure, the passage means having outlets controlled by the positions of the two devices respectively to vary the pressure in said passage means, and control means whereby the speed of the part can be varied in accordance with the difference in pressure in the passage means respectively, equality of pressures in the two passage means being possible when the devices are vibrating with their amplitudes equal.
Inventors
- 👤 Kenneth Percival Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:40
CPC Classifications
G; G05; G05D; G05D13/00; F; F15; F15C; F15C1/00; F15C1/002; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065; Y10T137/2071
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
Apparatus for sensing and controlling the speed of a rotating part comprising, in combination, means for providing a fluid pressure pulsating at a rate related to the speed of the part, two devices to which the pulsating pressure is applied, said two devices being capable of vibrating under the influence of the pressure pulses and being designed to resonate at different frequencies, two passage means, a common supply means for supplying fluid under steady pressure to both said passage means, said passage means having outlets arranged to be controlled by the positions of said two devices respectively, to vary the pressure in passage means respectively, and control means whereby the speed of the part can be varied in accordance with any difference in pressure in said passage means respectively, the arrangement in use being such that there will only be equality of pressures in said two passage means when the two devices are vibrating with their amplitudes equal.
Claim 2
Dependent Claim
158 words
Apparatus for sensing and controlling the speed of a rotating part comprising, in combination, means for providing a fluid pressure pulsating at a rate related to the speed of the part, two devices to which the pulsating pressure is applied, said two devices being capable of vibrating under the influence of the pressure pulses and being designed to resonate at different frequencies, two passage means, a common supply means for supplying fluid under steady pressure to both said passage means, said passage means having outlets arranged to be controlled by the positions of said two devices respectively, to vary the pressure in passage means respectively, and control means whereby the speed of the part can be varied in accordance with any difference in pressure in said passage means respectively, the arrangement in use being such that there will only be equality of pressures in said two passage means when the two devices are vibrating with their amplitudes equal.
Claim 3
Dependent Claim
72 words
Apparatus as claimed in claim 1 in which the means for providing a pulsating fluid pressure comprises a source of fluid at steady pressure, a body defining a passage through which the fluid passes, said passage being divided into two separated portions, a disc carried by the rotating part, and the disc having a passage which, at one angular position, affords communication between the separated portions of the passage in the body.
Claim 4
Dependent Claim
37 words
Apparatus as claimed in claim 1 in which the devices comprIse reeds at which the pulsating fluid is directed in use, the reeds being designed so that their resonant frequencies differ but are in the same range.
Claim 5
Dependent Claim
24 words
Apparatus as claimed in claim 3 in which the passage means terminate in respective nozzles which are disposed adjacent to the reed ends respectively.
Claim 6
Dependent Claim
27 words
Apparatus as claimed in claim 1 in which the control means is a piston and cylinder unit, opposite ends of which communicate with the passage means respectively.
Claim 7
Dependent Claim
38 words
Apparatus as claimed in claim 1 in which the devices comprise L-shaped hollow reeds to the interior of which the pulsating pressure is applied, the reeds carrying respective knives which control the outlets of the passage means respectively.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |