Method and apparatus for compressing a wood sample
US5190088A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Oct 15, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27H1/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A heated wood sample (46) having a water content exceeding 20 percent is compressed axially in the direction of the grain or fibres of the sample in a compression mould (10). Oppositely directed compressive forces are applied not only to the end surfaces of the sample, for example by means of a hydraulic cylinder (18), but also to side surface parts of the sample as frictional forces. The sample may be arranged within a compression chamber which is at least partly defined by longitudinally overlapping side wall parts (30, 37, 47, 48), which are mutually displaceable in the longitudinal direction of the chamber, and these side wall parts may be pressed into frictional engagement with the sample (46) for example by means of an inflatable bag or an inflatable hose section (32, 34), and means may be provided for mutually displacing the side wall parts so as to apply frictional compressive forces to the wood sample. The side wall parts or friction plates may engage with longitudinally spaced sections of the sample (46), if desired. However, if a substantially uniform compression along the length of the sample desired, the side wall parts are preferably arranged in parts (30, 37 and 47, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.