Drive for moveable shield in luggage screening apparatus

Details Drive for moveable shield in luggage screening apparatus Drive for moveable shield in luggage screening apparatus

1978-09-22

1980-07-01

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250360, 318135, G01K 2300

Patent

active

042108110

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.

REFERENCES:
patent: 3135880 (1964-06-01), Olson et al.
patent: 3678278 (1972-07-01), Pell
patent: 3852600 (1974-12-01), Faulkner et al.
patent: 3891907 (1975-06-01), Lenzkes et al.
patent: 4020346 (1977-04-01), Dennis

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