Abstract: An apparatus holds a feeler gage. The apparatus includes a shaft having an end to which the feeler gage is attached. A fixture aligns the shaft with an opening into which the feeler gage is inserted. The opening may be a gap of a connector. A portion of the shaft is a measuring section having a plurality of markers. The markers are stripes, grooves, or lands on a portion of the shaft. The fixture comprises a channel, sleeve or bearing that guides the shaft onto the fixture. The fixture includes a ridge for insertion of the fixture onto a track. The fixture may have an alignment arm that engages a side surface of the connector. The fixture has a latch that attaches the fixture to the track. The latch of the fixture comprises two substantially parallel elongate members separated by a distance approximately equal to a width of the track.

Abstract: A rotatable latch is provided for securing an object to a holder and for preventing unintended removal of the object. In a preferred embodiment, the rotatable latch has at least two actuators flexibly mounted to a body. Each actuator has a hooked portion which engages a portion of the holder. A lever portion may be provided for releasing the hooked portion. The hooked portion is rotated about a pivot point to release the object from the holder. Rotation occurs when actuators are released through use of at least two lever portions. To prevent accidental removal of the object, the second actuator cannot be released until the first actuator has been released. The latch requires at least two actions, pressing the levers in succession, to release the object. The invention is applicable, for example, to circuit packs for electronic circuit boards.

Abstract: An inexpensive cable is utilized to permit multiple identical shelves in a bay of interface units to be wired for a plurality of signals by utilizing conventional twenty-five pin wiring. Hand-wired dedicated cables normally used for routing alarm signals are avoided. Printed wiring backplanes are utilized for connecting the common signals together and for permitting appropriate connections for the plurality of individual signals to be connected to the appropriate interface units positioned in the bay. The backplanes have an identical pattern so that the interface units can be used interchangeably.

Abstract: A fuse for interfacing electrical current with electronic components and for shielding the electronic components from potentially damaging electrostatic discharge. The fuse includes a fuse body having an edge and first and second electrical contacts. A fuse indicator is connected to one electrical contact and a fuse element extends between the indicator and the other contact for providing a conduit for operating current to reach the interfaced electronic components. A window is disposed on the edge of the fuse body and positioned over the fuse indicator. Sealant is disposed between the window edge and the fuse body edge to prevent the accumulation of air therebetween and, thereby, preventing such accumulated air from functioning as a transmission medium through which an electrostatic discharge can travel and reach the electronic components.