초록 ▼

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

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.

대표청구항 ▼

In a radiation-screening apparatus for inspecting sealed articles such as parcels and luggage, including a moveable shield selectively enclosing a monitoring duct, and drive means for moving said shield with respect to a fixed housing of said apparatus, the improvement comprising wherein: said drive

In a radiation-screening apparatus for inspecting sealed articles such as parcels and luggage, including a moveable shield selectively enclosing a monitoring duct, and drive means for moving said shield with respect to a fixed housing of said apparatus, the improvement comprising wherein: said drive means comprises: an electromagnetically operable linear motor means having a rail and a stator, one of said rail and stator being attached to the shield and the other being fixed in the housing; and motor control means connected to said linear motor means and to an electrical power supply, said control means including three proximity switches and an activator, said switches and activator being mounted to be moveable relative to each other, two of said switches comprising limit end switches terminating electrical power to drive said linear motor at opposite ends of travel of said shield and the third proximity switch comprising a braking switch reducing electrical power to said linear motor between opposite ends of travel of said shield.