Product and method of making bellows
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United States of America Patent
Stats
-
Jun 29, 1982
Grant Date -
N/A
app pub date -
Apr 28, 1980
filing date -
Apr 28, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A product and method of making a bellows from thermoplastic sheet material including forming a plurality of substantially U-shaped gussets having inside and outside edges, heat-sealing the inside edges of the gussets in pairs, heat-sealing the outside edges of adjacent pairs in an accordion-like stack, and then heat-sealing the stack of sealed gussets between a folded cover member of thermoplastic sheet material having an air passage through the cover member for communication with an expansible air chamber formed by the cover member and the gussets.
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