Abstract:
A light fixture includes multiple sets of light-producing devices, such as bulbs. A first set of bulbs is illuminated. When one or more bulbs in the first set of bulbs fails, the failure is detected, and a second set of bulbs is illuminated: If a number of good bulbs remaining falls below a predetermined threshold, the light fixture provides a notification that a bulb change is required. The notification may include visual, audio, or electronic notification. By providing multiple sets of bulbs and a controller to detect a bulb failure and automatically switch to a different set of bulbs, the light fixture and method of the preferred embodiments provide high-reliability lighting that automatically compensates when a bulb burns out.
Abstract:
An assembly for replacing the top sigma sections in a tail drive of an armored face conveyor is described. The assembly joins the sigmas to the top deck in a single unit, providing more robust mounting support. The assembly may also include one or more mounting pins, as well as one or more access doors. The assembly requires no welding to the tail drive.
Abstract:
A computer system and method inhibit interruption of a user that is actively using the computer system. A user is actively using the computer system if the user has provided defined input within a time period specified in a “do not disturb” specification. For example, if the time period in the “do not disturb” specification is set to ten seconds, a user will not be interrupted by a potential interrupting event if the user has, for example, pressed a keyboard key or clicked a mouse key within ten seconds of the potential interrupting event. In this manner a user that is actively using a computer system will not be interrupted by potential interrupting events. In a first embodiment, the do not disturb mechanism is defined globally in the operating system. In a second embodiment, each software application may include a “do not disturb” specification.