Method and apparatus for making and manipulating inner tubes for use in dry cells or the like
US4642083A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1985 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Jul 12, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31C1/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Discrete sheets of separator material for use in dry cells are introduced tangentially into an annular clearance between the cylindrical internal surface of an outer tool and the cylindrical peripheral surface of an inner tool, and the inner tool is rotated about its axis while one or more spring-biased rollers urge the sheet in the clearance against its peripheral surface so that the sheet is converted into an inner tube which tends to expand radially and is introduced into an outer tube in response to axial shifting of the inner tool. A shoulder between the inner tool and a support for the inner tool pushes one end face of the inner tube from the clearance, and the inner tube is free to expand radially into contact with the internal surface of the respective outer tube in response to complete expulsion from the outer tool. The inner tool is then rotated in a direction to expand the inner tube prior to extraction of the inner tool from the outer tube, and the inner tube is held against extraction from the outer tube with the inner tool by the adjacent end face of the outer tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.