Patent US3582769A successfully refreshed from Google Patents.
US3582769A
Expired / Lapsed
US
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Device for the noncontact gauging the displacement of objects moved in a straight line
Assignee: US Philips Corp
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Filing: 1970-02-24
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Granted: 1971-06-01
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Expires: 1990-02-24
Abstract
Abstract A device for noncontact gauging the linear displacement of an object includes a member having linearly spaced magnetic marks thereon whose centers lie along a straight line. A rotatable disc has uniformly spaced magnetic strips formed as involutes, the common evolute of which is a circle. The disc and member are relatively disposed such that the circle tangentially contacts a plane passing through the straight line connecting the centers of said marks. Measuring means is provided to determine the markstrip-coincidence and thus provide a frequency signal with a phase related to a relative displacement.
Inventors
- 👤 Klaus Brandenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:37
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
174 words
A device for determining without contact incremental position variation of objects moved in a straight line comprising a member for attachment to said objects having thereon a plurality of spaced reference marks positioned linearly thereon and uniformly dividing said member into lengths of measurement, a disc having strips formed in an annular shaped band on the outer edge of the disc, said strips being involutes the common evolute of which is the inner circumference of the band, said disc being positioned adjacent said member and mounted for rotation relative to said member such that the inner circumference of said band tangentially contacts a plane passing through a straight line connecting the centers of said spaced reference marks, means to rotate the disc and move the strips relative to the reference marks, and means mounted adjacent said disc and member and responsive to the position of said reference marks relative to said strips to produce a signal the phase of which changes upon movement of said member, whose movement represents position variations of said object.
Claim 2
Independent Claim
174 words
A device for determining without contact incremental position variation of objects moved in a straight line comprising a member for attachment to said objects having thereon a plurality of spaced reference marks positioned linearly thereon and uniformly dividing said member into lengths of measurement, a disc having strips formed in an annular shaped band on the outer edge of the disc, said strips being involutes the common evolute of which is the inner circumference of the band, said disc being positioned adjacent said member and mounted for rotation relative to said member such that the inner circumference of said band tangentially contacts a plane passing through a straight line connecting the centers of said spaced reference marks, means to rotate the disc and move the strips relative to the reference marks, and means mounted adjacent said disc and member and responsive to the position of said reference marks relative to said strips to produce a signal the phase of which changes upon movement of said member, whose movement represents position variations of said object.
Claim 3
Dependent Claim
38 words
A device as claimed in claim 1 wherein the strips are magnetically conductive and form when coincident with said reference marks a magnetic path, and said signal-producing means is a coil and magnet positioned in said magnet path.
Claim 4
Dependent Claim
28 words
A device as claimed in claim 2 wherein the member has two parallel rows of equidistant reference marks arranged symmetrically with respect to the center of the disc.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |