Abstract: A personal computer chassis including a bottom element, front and back walls, and a side wall. The front wall is mounted to a front end of the bottom element, and the back wall is mounted to the back end of the bottom element. The side wall is hinged to a first side end of the bottom element. When the side wall is in a closed position, it is capable of engaging with the front wall and the back wall. The side wall may help the chassis maintain an EMI shield for the computer. The side wall may be configured to allow opening and closing without the use of a tool. Moreover, the side wall may optionally remain attached to the bottom element when opened such that the side wall can not readily be lost or misplaced. The hinged side wall may include reinforcement members extending generally perpendicularly outward from its edges, for improving the structural integrity of the chassis in the closed position. The disclosure further shows a computer chassis having a back wall defining an access opening.

Abstract: The present invention is an apparatus for detecting fault conditions, such as missing or improper hardware, in the operation of a fastener press. It includes a workpiece die that is aligned with and cooperates with a punch assembly in the insertion of the fasteners into holes in the workpiece. The die has a linear displacement member mounted for reciprocal movement in response to the operation of the punch assembly. The position of the linear displacement member, which represents whether or not a fault condition exists, is detected and an alarm indication is generated when there is a fault.