Apparatus for sealing a door
US4891910A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1988 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Dec 30, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/0805
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for sealing a door of a chamber, the chamber being of the type wherein the door is urged into engagement with the chamber upon rotation of a locking wheel and having a seal positioned between the door and the chamber such that upon movement of the door toward the chamber the seal is compressed, comprises a motor for providing torque to the locking wheel for urging the door toward the chamber. A current source supplies current to the motor. A circuit monitors the current supplied to the motor to determine if a desired degree of pressure between the seal and the chamber has been achieved based on the amount of current drawn by the motor. The current source is responsive to the monitoring circuit so as to end the supply of current to the motor when the desired degree of pressure is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.