Applicator utilizing high speed non-contact extrusion valve
US4962871A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Jul 24, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65C9/2217
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An airless, solenoid-operated applicator having a high speed non-contact extrusion valve, wherein the time required for opening and closing the plunger assembly of the valve, as well as for the applicator to recycle, is minimized by concentrating an electromagnetic field on pole pieces made of magnetically soft material. The electromagnetic field is generated by a coil having windings with a length substantially equal to the distance between their inner and outer diameter. Further, the dynamic pole has a length relative to the length of the windings since the plunger assembly is spring-loaded within the static pole instead of the dynamic pole. An annealing process may also be performed on the pole pieces, as well as various magnetically conductive and corrosion resistant coatings or platings applied thereto, in order to further enhance the susceptibility of the pole pieces to magnetism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.