Apparatus for measuring restoring force necessary for raising folded portions of hard paper boxes
US4046001A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 27, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Jun 27, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0623
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring a restoring force necessary for raising folded portions of a hard paper box is disclosed. The apparatus comprises a base plate to which is attracted one folded portion of the hard paper box by means of vacuum, a hollow rotary wing to which is attracted another folded portion of the hard paper box by means of vacuum, means for rotating the hollow rotary wing together with said another folded portion around a ruled folded line edge formed between said one folded portion and said another folded portion, said one folded portion attracted to said base plate being kept stationary, and means for measuring difference between a force necessary for rotating said hollow rotary wing under no load condition and a force necessary for rotating said hollow rotary wing under a load condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.