Patent US3906356A successfully refreshed from Google Patents.
US3906356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus using solenoid coils for detecting retilinear movement
Assignee: Shibaura Machine Co Ltd
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Filing: 1974-06-07
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Granted: 1975-09-16
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Expires: 1994-06-07
Abstract
Abstract In apparatus for detecting rectilinear movement of the type comprising a screw made of magnetic material and provided with a single screw thread and a detection coil including a bobbin slidably containing the screw and provided with double screw threads having a pitch of one half of the pitch of the single screw thread, a pair of solenoid coils wound in the valleys of the double screw threads, and lead conductors connected to the opposite ends of the solenoid coils the lead conductors of one solenoid coil being 180* apart from the lead conductors of the other solenoid coil, whereby the difference in the inductances of the pair of solenoid coils is detected for measuring the relative rectilinear movement between the screw and the detection coil, the inductances of the opposite ends of the solenoid coils are made smaller than the inductances of the intermediate portions.
Inventors
- 👤 Takao Manabe
- 👤 Satosi Kumamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:11
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/2006; G01D5/2013
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
In apparatus for detecting rectilinear movement of the type comprising a screw made of magnetic material and provided with a single screw thread of a predetermined pitch, and a detection coil, said detection coil including: (i) a bobbin slidably containing said screw and provided with double screw threads formed on its outer surface and having a pitch of one half of said predetermined pitch, (ii) a pair of solenoid coils wound in alternate valleys of said double screw threads, and (iii) lead conductors connected to the opposite ends of said solenoid coils, the lead conductors of one solenoid coil being 180* apart from the lead conductors at the other solenoid coil, whereby the difference in the inductances of said pair of solenoid coils is detected for measuring the relative rectilinear movement between said screw and said detection coil, the improvement wherein the inductances of the opposite ends of said solenoid coils are made smaller than the inductances of the intermediate portions of said solenoid coils.
Claim 2
Dependent Claim
165 words
In apparatus for detecting rectilinear movement of the type comprising a screw made of magnetic material and provided with a single screw thread of a predetermined pitch, and a detection coil, said detection coil including: (i) a bobbin slidably containing said screw and provided with double screw threads formed on its outer surface and having a pitch of one half of said predetermined pitch, (ii) a pair of solenoid coils wound in alternate valleys of said double screw threads, and (iii) lead conductors connected to the opposite ends of said solenoid coils, the lead conductors of one solenoid coil being 180* apart from the lead conductors at the other solenoid coil, whereby the difference in the inductances of said pair of solenoid coils is detected for measuring the relative rectilinear movement between said screw and said detection coil, the improvement wherein the inductances of the opposite ends of said solenoid coils are made smaller than the inductances of the intermediate portions of said solenoid coils.
Claim 3
Dependent Claim
117 words
The apparatus according to claim 1 wherein said detection coil is provided with first and second ends, each one of said solenoid coils comprises first and second coils electrically insulated from each other and connected in parallel, said first coil having ends, and said second coil having ends, one end of said first coil terminates a short distance from said first end of said detection coil, the other end of said first coil terminates at said second end of said detection coil, one end of said second coil terminates at said first end of said detection coil and the other end of said second coil terminates a short distance from said second end of said detection coil.
Claim 4
Dependent Claim
25 words
The apparatus according to claim 1 wherein said pair of solenoid coils are connected in an electric bridge circuit to act as two arms thereof.
References Cited (Backward Citations)
US2769969A
Cited
US3444542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |