Patent US2208784A successfully refreshed from Google Patents.
US3762053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for testing the flatness of the surface of a lapping plate of a lapping machine
Assignee: NEW SPITFIRE Inc A CORP OF
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Filing: 1971-02-11
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Granted: 1973-10-02
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Expires: 1991-02-11
Abstract
Abstract A device for testing the flatness of the surface of a flat lapping plate of a lapping machine, the device including a probing device manipulated over the surface of the lapping plate and having a probing finger riding on and in engagement with a wire cable stretched taut over and above the surface of the lapping plate and supported upon the lapping plate at opposite corresponding portions thereof. The probing device has an indicator receptive to the flat condition of the surface of the lapping plate to indicate the minutest variation in the flatness of such plate.
Inventors
- 👤 L Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:54
CPC Classifications
G; G01; G01B; G01B5/00; G01B5/28; G01B5/285
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
231 words
A device for testing the flat surface of a lapping plate, comprising a. an elongated generally rectangularly shaped bar adapted to be freely positioned transversely above the surface of the lapping plate to be tested, b. means adjacent either end of said bar for supporting said bar in a transverse position above the top surface of the lapping plate, c. a cable supported by said bar and extending longitudinally about said bar in the form of a taut loop spaced from the longitudinal sides of said elongated bar, d. one of said means adjacent one end of said bar for supporting the same on the lap plate comprising a crossbar extending beneath and beyond the sides of said elongated bar, with another of said means adjacent the other end of said elongated bar comprising an adjustment screw movable vertically through said elongated bar transversely to its longitudinal length and adapted to position said other end of said elongated bar in the same horizontal plane as said one end of said elongated bar, and e. an indicator device freely movable longitudinally of said bar over the surface of the lapping plate to be tested and having a dial and a probe finger, with the probe finger in contact with said cable so as to transmit to the dial for registration thereon any degree of unevenness in the surface of the lapping plate.
Claim 2
Independent Claim
231 words
A device for testing the flat surface of a lapping plate, comprising a. an elongated generally rectangularly shaped bar adapted to be freely positioned transversely above the surface of the lapping plate to be tested, b. means adjacent either end of said bar for supporting said bar in a transverse position above the top surface of the lapping plate, c. a cable supported by said bar and extending longitudinally about said bar in the form of a taut loop spaced from the longitudinal sides of said elongated bar, d. one of said means adjacent one end of said bar for supporting the same on the lap plate comprising a crossbar extending beneath and beyond the sides of said elongated bar, with another of said means adjacent the other end of said elongated bar comprising an adjustment screw movable vertically through said elongated bar transversely to its longitudinal length and adapted to position said other end of said elongated bar in the same horizontal plane as said one end of said elongated bar, and e. an indicator device freely movable longitudinally of said bar over the surface of the lapping plate to be tested and having a dial and a probe finger, with the probe finger in contact with said cable so as to transmit to the dial for registration thereon any degree of unevenness in the surface of the lapping plate.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |