Patent · US Expired

Apparatus for pulling open tube sections to form base squares in the production of cross-bottom sacks

US4371367A · kind A · utility

2Cited by

4References

17Claims

0Family size

Assignee

Windmöller & Hölscher KG · DE

Inventors

Fritz Achelpohl · Lengerich, DE
Werner Decker · Ladbergen, DE

Key dates

Filing date	Jul 24, 1980
Grant date	Feb 1, 1983
Priority date	—
Expiry date	Jul 24, 2000

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB31B2160/10
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

An apparatus for opening and folding the end of a flattened tubular sheet to define the rectangular base of a bag or sack to be made from the sheet comprises a table having a slot through which the flattened sheet projects, the projection being formed into a bag base by suckers locating the projection in a pre-opened condition and grippers which engage opposed margins of the projection, one of the grippers being fixed and the other being secured to a pivotable arm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.