Method of making a preformed semirigid plastic hose wrapped with a wire spiral
US4342612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1979 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Jul 31, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S138/07
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides a hose that withstands a vacuum which is considered to be approximately two to three times greater than the vacuum withstood by the best known previously available pliable convoluted semirigid plastic hoses of comparable designs. To fabricate the hose, a bobbin of wire stock is unwound, with the wire preferably being pulled off the end of the bobbin. The wire is then looped around a spool to form it into a spiral or coil having a preset diameter which is proportionately smaller than the diameter of a preformed, semirigid convoluted plastic hose. While the pulled wire is still substantially extended, it is taken up by being rolled upon the plastic hose, thereby snapping the preset formed wire spiral into the spiral convolutions formed in the surface of the hose. If desired, the spiral or coil might be pulled off the end of the samller diameter spool to impart a twist thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.