Precision electromechanical measuring device
US4622751A · kind A · utility
Inventor
Key dates
| Filing date | Jul 16, 1985 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Jul 16, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S33/13
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A precision electromechanical measuring device utilizes a strain gauge or pressure transducer to sense changes of position in a workpiece contacting finger. The finger is pivotable about a relatively stiff pivot to different positions, enabling the instrument's use as a center finder for circular bores and pins or for verifying the flatness and perpendicularity of a disc or plate to the axis of rotation of a spindle. A housing of the device supports a rotatable shank extending from one end for engagement in a chuck, mandrel or collet associated with a spindle of a machine, and also supports pivotal apparatus including the finger extending out the other end of the housing. Brushes conduct a variable signal from the strain gauge in the housing to the exterior, where the signal is fed to an ammeter. In use as a center finder, the device is fixed in a chuck or mandrel, with a workpiece approximately alligned with the center of rotation of the mandrel, the finger is engaged against the interior of a bore or the exterior of a pin of the workpiece, and the machine spindle is power-rotated to sweep the finger around the bore or pin. Variations in the reading of the ammeter indicate eccentr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.