Capillary bore straightness inspection
US4690556A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1985 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Jul 30, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/306
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for checking straightness of an elongated generally cylindrical bore, such as a capillary bore, includes directing a collimated light beam through the bore, with the bore skewed slightly with respect to the beam. This causes a wall of the bore to reflect some of the beam light, forming generally an off-axis ring of reflected light beyond the end of the bore, in addition to an on-axis spot of un-reflected light. Variation in the off-axis reflected light ring pattern by scatter of reflected light indicates non-straightness of the reflecting bore wall. Variation of the light in the ring is determined by measuring equipment. The cylindrical bore may be rotated sequentially through a plurality of positions, such as four positions, to check the entire circumference of the bore. The degree of bore non-straightness may be quantitatively measured electronically or mechanically. The methods of the invention may be used to check straightness of bores that are tapered or not tapered and to check diameter and out-of-roundness of bores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.