Packing bag having drawstrings
US5265962A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1993 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Jan 22, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D33/28
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A packing bag comprises a flat main body made of a synthetic resin film or sheet, sleeves formed around a top end of the main body and each divided into upper and lower chambers, and drawstrings each inserted in the respective chambers of each sleeve. A plurality of engaging portions in the form of knurled indentations are formed between the upper and lower chambers and below the lower chambers so that an increased friction and a reduced stiffness are imparted to the sleeve, in such manner that after the top end portions are gathered by pulling the drawstrings in opposite directions, the increased friction and reduced stiffness prevent the top end from opening unintentionally due to a possible resilient restoration of its ungathered state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.