Transverse vibration apparatus for grading wood panels
US4722223A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1986 |
| Grant date | Feb 2, 1988 |
| Priority date | — |
| Expiry date | May 6, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N3/303
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides an apparatus and method for establishing a measure of the modulus of elasticity of a wood panel. The apparatus comprises a support frame having a triangular array of panel support points provided thereon. A load cell, in combination with one support point, is interconnected to a frequency counter. This assembly is functional to determine the weight and vibration frequency of a dropped panel. A panel lifting assembly is provided to raise and drop the panel, thereby causing it to vibrate at its natural frequency. In a process aspect, the invention involves supporting the panel at three triangularly arranged support points, raising the panel at the apex end, and dropping the panel to cause it to vibrate at its resonant frequency, and computing a measure of stiffness from the measurements made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.