Abstract: A circuit board guidance device is arranged to have a circuit board such as a PCI I/O board 205 inserted therein for connection into an electrical socket or connector 203 located on a system motherboard 201. The guidance device includes a guidance mechanism which translates an insertion force applied in one direction into a connecting force effective to move the circuit board in a second direction. The guidance device is effective to aid in locating the circuit board 205 above connector 203 on the system motherboard 201, and also to aid in forcing the desired electrical connection between corresponding connectors on the circuit board 205 and a system motherboard 201. The guidance device is also effective in aiding in the extraction of the circuit board from its connection to the motherboard connector 203. An I/O bracket 261 is implemented to provide EMI grounding to the system bulkhead.

Abstract: A thumbscrew apparatus for fastening a first device to a second device. In a first embodiment, the apparatus comprises a screw attached to the second device and a first cylinder screwed onto the screw for fastening the first device to the second device. The first cylinder has an outboard end with a one-way slot feature that allows a screwdriver to be used to loosen the first cylinder while inhibiting the use of the screwdriver to tighten the cylinder. In a second embodiment, the shaft of the screw has a first portion smaller in diameter than a second portion. The first portion also has a thread pitch smaller than that of the second portion. A second cylinder contained within the first cylinder is screwed onto the second portion of the shaft while the first cylinder is screwed onto the first portion. A pin is used to lock the first cylinder to the second cylinder such that both cylinders are turned at the same revolution.