Envelopes – wrappers – and paperboard boxes – File folder or file envelope – Hanging type
Patent
1976-11-17
1978-09-05
Garbe, Stephen P.
Envelopes, wrappers, and paperboard boxes
File folder or file envelope
Hanging type
229 65, B65D 3114, B65D 3330
Patent
active
041113543
ABSTRACT:
A valve bag for bulk materials has a filler valve inserted in an end closure section and consisting of a tube of flexible material which passes through the end closure section and a wire spring attached to the tube and bearing against the end closure section for folding over the tube to pinch off the tube and thereby close the valve automatically after the bag has been filled. Preferably, the valve bag when empty is folded so as to hold the spring in its stressed condition with the filler valve open. The spring may be shaped as an S, Z or 8.
REFERENCES:
patent: 810318 (1906-01-01), Bates
patent: 2444891 (1948-07-01), Johnsson
patent: 2572686 (1951-10-01), Andre
patent: 3894682 (1975-07-01), Harmsen
Anker-Schiffarts-Gesellschaft mbH & Co. KG
Garbe Stephen P.
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