Plastic cap
US4971213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1988 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Dec 21, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S215/01
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Disclosed is a plastic cap comprising a top plate and a skirt hanging down from the peripheral edge of the top plate, which are integrally formed of a plastic material, and a mechanism for clamping the cap to a vessel, which is arranged on the inner circumferential face of the skirt, wherein a receiving seat to be substantially exactly engaged with the top edge or peripheral edge of the vessel mouth and at least one sealing projection protruding from the receiving seat through a groove by a very small distance from the face of the receiving seat are arranged in an inner corner portion between the top plate and the skirt or in the vicinity thereof, and sealing is effected by the pressure generated by compression deformation of the sealing projection. In this plastic cap, plastic deformation of the sealed portion is prevented and a high durable sealing pressure is obtained. Accordingly, this plastic cap has an excellent pressure-resistant sealing property and an excellent venting property in combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.