One-way valve and door check apparatus
US8117716B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 5, 2007 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Oct 7, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87829
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A one-way valve having a conduit for allowing liquid to flow therein, a valve element provided in the conduit, a hole portion provided in the conduit on the upstream side of the valve element and configured to be brought into a closed state by being closed by the valve element, and a spring that urges the valve element in the direction to close the hole portion, in which the peripheral surface of the valve element is formed with a first surface and a second surface intersecting the direction of movement of the valve element and generating a component force in the direction to close the hole portion when an urging force of the spring is applied, the first surface and the second surface are formed so as to increase the component force in the direction to close the hole portion as the valve element approaches the hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.