US3602596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roughness testing meters
Assignee: Barnes Engineering Co
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Filing: 1968-04-05
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Granted: 1971-08-31
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Expires: 1988-04-05
Abstract
Abstract A roughness meter for measuring r.m.s. roughness, especially in the range from about 1-5 Mu in., the meter providing a choice of at least two wavelength bands of illumination, at least one being in the infrared. The wavelength of illumination, or more precisely the reflected radiation, is preferably from 20-50 times the r.m.s. roughness. The radiation is reflected onto various curved surfaces, such as toroidal surfaces of ball bearing races. In every case a reflecting surface is used which causes the beam of radiation to strike all points of the surface at substantially normal incidence, and there is in the beam path no material which has a significant refractive index which is wavelength dependent. Air is preferred. Reflected light is detected and an electrical output is produced which is a measure of the r.m.s. reflectance. The reflecting surface may be a portion of an ellipsoid or a parabolaoid. In the first case the beam of radiation is focused at one of the conjugate foci of the ellipse and the bearing space is accurately positioned so that the center of its curvature is at the other conjugate focus. In the case of a parabola, of course, collimated light is used.
Inventors
- 👤 Robert W Astheimer
- 👤 Morris Weiss
- 👤 Philippe Villers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:30
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/30; G01B11/303
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
In a roughness testing meter for measuring the r.m.s. roughness of concave toroidal surfaces, which instrument comprises radiometric means capable of responding to radiation bands having minimum wavelengths of more than 10 times r.m.s. roughness, the illuminating means forming a beam along the axis of the revolution of the toroidal surface, and radiometric means positioned to receive reflected illumination from the illuminated toroidal surface said radiometric means producing an output which is a function or r.m.s. roughness, the improvement which comprises a. means for successively selecting at least two wavelength bands of reflected radiation to the radiometrIc means, at least one of these bands being in the infrared, b. a reflecting surface in the form of a surface of revolution about the axis of the illumination beam and the toroidal surface to be measured, said reflecting surface being positioned to reflect light onto the toroidal surface at approximately normal incidence, c. the instrument having an all-reflecting path for the illuminating beam to the toroidal surface, said path consisting of a medium which transmits infrared radiation and has a wavelength-independent refractive index approximating that of air.
Claim 2
Dependent Claim
185 words
In a roughness testing meter for measuring the r.m.s. roughness of concave toroidal surfaces, which instrument comprises radiometric means capable of responding to radiation bands having minimum wavelengths of more than 10 times r.m.s. roughness, the illuminating means forming a beam along the axis of the revolution of the toroidal surface, and radiometric means positioned to receive reflected illumination from the illuminated toroidal surface said radiometric means producing an output which is a function or r.m.s. roughness, the improvement which comprises a. means for successively selecting at least two wavelength bands of reflected radiation to the radiometrIc means, at least one of these bands being in the infrared, b. a reflecting surface in the form of a surface of revolution about the axis of the illumination beam and the toroidal surface to be measured, said reflecting surface being positioned to reflect light onto the toroidal surface at approximately normal incidence, c. the instrument having an all-reflecting path for the illuminating beam to the toroidal surface, said path consisting of a medium which transmits infrared radiation and has a wavelength-independent refractive index approximating that of air.
Claim 3
Dependent Claim
96 words
A meter according to claim 1 in which the path of the illumination beam to the toroidal surface is through air. A roughness meter according to claim 1 in which the reflecting surface of revolution is an ellipsoid and the toroidal surfaces have circular cross sections in a plane containing the axis of the torus, the illuminating beam and reflecting surface position being adjusted to image a small illuminating source onto the successive points of a circle concentric with the torus axis and being the locus of the centers of curvature of the concave toroidal surface.
Claim 4
Dependent Claim
72 words
A roughness tester according to claim 1 for measuring toroidal surfaces having circular curvature in the plane containing the torus axis, in which the reflecting surface of revolution is a parabolic surface of revolution, the illuminating means producing collimated light and the parabolic reflecting surface imaging a small light source onto a circle concentric with the torus axis which circle is the locus of the centers of curvature of the toroidal surface.
Claim 5
Dependent Claim
32 words
A roughness meter according to claim 1 in which each selected wavelength band of reflected light has a minimum wavelength of from 20 to 50 times r.m.s. roughness measured in this range.
Claim 6
Dependent Claim
31 words
A roughness meter according to claim 3 in which each selected wavelength band of reflected light has minimum wavelength of from 20 to 50 times r.m.s. roughness measured in this range.
Claim 7
Dependent Claim
32 words
A roughness meter according to claim 4 in which each selected wavelength band of reflected light has a minimum wavelength of from 20 to 50 times r.m.s. roughness measured in this range.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |