Apparatus for measuring restoring force necessary for raising fo

Measuring and testing – Surface and cutting edge testing – Roughness

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73141R, 93 53SD, G01N 322, G01L 512, B31B 574

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active

040460010

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.

REFERENCES:
patent: 2646679 (1953-07-01), Buker
patent: 2782695 (1957-02-01), Meissner et al.
patent: 2949770 (1960-08-01), Kernan et al.
patent: 3449947 (1969-06-01), Ormond
patent: 3504530 (1970-04-01), McConnell
patent: 3840961 (1974-10-01), Brown
patent: 3905592 (1975-09-01), Spencer et al.

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