Abstract: An apparatus for inspecting various articles in connection with the present invention comprises a structure for operating a retractable door which includes a shaft member, a flexible door member carried by and windable on the shaft member, a motor structure for driving the shaft member, and a gear train mechanically linking the motor and shaft member. The gear train includes a drive gear and a driven gear with the driven gear being connected to the shaft member and the drive gear being connected to and driven by the motor. The drive gear and driven gear both comprise gear teeth about only a portion of the respective circumferences. A switch member for controlling the motor is provided, and an actuating control structure is provided with respect to the drive gear for controlling the switch member.

Abstract: An X-ray optical system for examining articles, comprising a source of X-rays directed in a generally downward first direction, fluorescent screen means for converting the X-rays to a light image, such screen means being disposed below said X-ray source, means for receiving the article between the X-ray source and the fluorescent screen means such that X-rays passing through the article reach the screen means to generate thereat a light image of the article, a first light reflecting means disposed generally below the fluorescent screen means so as to receive the light image from the fluorescent screen means, such light image being directed generally in the first direction, second light reflecting means disposed opposite and obliquely to the first light reflecting means, so as to receive the light image reflected from the first light reflecting means and to redirect the light image in a generally upward second direction, and means for viewing the light image, such viewing means being disposed above the second