US3745392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the frequency of rotation of a vehicle wheel
Assignee: ZF International UK Ltd
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Filing: 1970-11-10
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Granted: 1973-07-10
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Expires: 1990-11-10
Abstract
Abstract A device for measuring the frequency of rotation of a vehicle wheel comprises a toothed wheel rotatable with the vehicle wheel, and an electromagnetic pick-up winding past which in use the teeth move to produce pulses in the winding. The toothed wheel is provided with a layer of non-magnetic material which covers the crown of each tooth, the pick-up winding moving over the layer of the non-magnetic material and being resiliently urged towards the toothed wheel so as not to be disengaged from the layer in use. The arrangement of the layer of non-magnetic material is such that the winding remains at a constant distance from the teeth as the winding moves over the layer.
Inventors
- 👤 L Phoenix
- 👤 D Walpole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:43
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; B; B60; B60G; B60G2204/00; B60G2204/10; B60G2204/11; B60G2204/115
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A device for measuring the frequency of rotation of a vehicle wheel comprising a toothed wheel rotatable with the vehicle wheel, an electro-magnetic pick-up winding, means mounting the pick-up winding adjacent the toothed wheel so that, in use, the teeth of said wheel move past the winding to produce pulses in the winding, a layer of non-magnetic material covering the crown of each tooth of said wheel, and resilient means urging the pickup winding towards the toothed wheel so that the pick-up winding is always engaged with said layer of non-magnetic material as the teeth of said wheel move past the winding, the arrangement of said layer being such that the winding remains at a constant distance from the teeth as the teeth move past the winding.
Claim 2
Independent Claim
127 words
A device for measuring the frequency of rotation of a vehicle wheel comprising a toothed wheel rotatable with the vehicle wheel, an electro-magnetic pick-up winding, means mounting the pick-up winding adjacent the toothed wheel so that, in use, the teeth of said wheel move past the winding to produce pulses in the winding, a layer of non-magnetic material covering the crown of each tooth of said wheel, and resilient means urging the pickup winding towards the toothed wheel so that the pick-up winding is always engaged with said layer of non-magnetic material as the teeth of said wheel move past the winding, the arrangement of said layer being such that the winding remains at a constant distance from the teeth as the teeth move past the winding.
Claim 3
Dependent Claim
36 words
A device as claimed in claim 1 wherein said layer of non-magnetic material is arranged to extend over the crowns of the teeth and the gaps between the teeth without filling said gaps between the teeth.
Claim 4
Dependent Claim
29 words
A device as claimed in claim 1 wherein said layer of non-magnetic material is arranged to cover the crowns of the teeth and fill the gaps between the teeth.
Claim 5
Dependent Claim
29 words
A device as claimed in claim 1 wherein said toothed wheel is an externally toothed wheel with said teeth being formed on the external cylindrical surface of the wheel.
Claim 6
Dependent Claim
29 words
A device as claimed in claim 1 wherein said toothed wheel is internally toothed and includes a peripheral flange in the internal surface of which said teeth are formed.
Claim 7
Dependent Claim
23 words
A device as claimed in claim 1 wherein said teeth are formed as an annular row on one lateral surface of the wheel.
Claim 8
Dependent Claim
17 words
A device as claimed in claim 1 wherein a non-magnetic synthetic resin moulding supports the pick-up winding.
Claim 9
Independent Claim
176 words
A device for measuring the frequency of rotation of a vehicle wheel comprising an annular casing, means for mounting the casing on a member which moves vertically with the vehicle wheel, a toothed wheel rotatably mounted in the casing, the toothed wheel being rotatable with the vehicle wheel in use, a layer of non-magnetic material covering the crown of each tooth of said toothed wheel, a non-magnetic synthetic resin moulding mounted in the casing, an electro-magnetic pick-up winding supported by said synthetic resin moulding, means mounting the pick-up winding adjacent the toothed wheel so that, in use, the teeth of said wheel move past the winding to produce pulses in the winding, and resilient means urging the moulding into engagement with said layer of non-magnetic material so that the moulding always engages said layer as the teeth of said wheel move past the pick-up winding in use, the arrangement of said layer of non-magnetic material being such that the winding remains at a constant distance from the teeth as the teeth move past the pick-up winding.
Claim 10
Independent Claim
176 words
A device for measuring the frequency of rotation of a vehicle wheel comprising an annular casing, means for mounting the casing on a member which moves vertically with the vehicle wheel, a toothed wheel rotatably mounted in the casing, the toothed wheel being rotatable with the vehicle wheel in use, a layer of non-magnetic material covering the crown of each tooth of said toothed wheel, a non-magnetic synthetic resin moulding mounted in the casing, an electro-magnetic pick-up winding supported by said synthetic resin moulding, means mounting the pick-up winding adjacent the toothed wheel so that, in use, the teeth of said wheel move past the winding to produce pulses in the winding, and resilient means urging the moulding into engagement with said layer of non-magnetic material so that the moulding always engages said layer as the teeth of said wheel move past the pick-up winding in use, the arrangement of said layer of non-magnetic material being such that the winding remains at a constant distance from the teeth as the teeth move past the pick-up winding.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |