Drive for moveable shield in luggage screening apparatus
US4210811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1978 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Sep 22, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N23/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for inspecting or screening articles, such as closed luggage and parcels, having a moveable shield to enclose selectively a monitoring duct area in which the articles are placed for screening by X-ray or similar radiation. The shield moves in a fixed housing (which may in turn be mobile) on wheels. A linear drive motor has a stator fixed in the bottom of the housing. The shield carries a rail electromagnetically reactable directly with the stator. Proximity switches in the housing activated by a magnet on the shield control the travel of the shield. A switch located between the end of travel switches may be employed to vary the speed of the linear motor to provide quick, safe cycling of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.