Abstract: An assembly comprises a resistor plate for a rotating rectifier assembly (RRA). A shaft bore is defined through the resistor plate for passage of a shaft of an electrical machine, and the resistor plate defines a main annular body around the shaft bore. A first protrusion extends radially outward from the main annular body, so that a first pin bore extends through the first protrusion. At least one contact band is seated in a the pin bore of the resistor plate for mounting a direct current (DC) pin to the resistor plate.

Abstract: A head-mounted display may include a display system and an optical system in a housing. The display system may have displays that produce images. Positioners may be used to move the displays relative to the eye positions of a user's eyes. An adjustable optical system may include tunable lenses such as tunable cylindrical liquid crystal lenses. The displays may be viewed through the lenses when the user's eyes are at the eye positions. A sensor may be incorporated into the head-mounted display to measure refractive errors in the user's eyes. The sensor may include waveguides and volume holograms, and a camera for gathering light that has reflected from the retinas of the user's eyes. Viewing comfort may be enhanced by adjusting display positions relative to the eye positions and/or by adjusting lens settings based on the content being presented on the display and/or measured refractive errors.

Abstract: An impact tool having a front lubrication assembly. The front lubrication assembly includes a lubrication port, a lubrication passage and at least one lubrication channel that directs a lubricant injected from a front end of the impact tool directly into an impact assembly of the impact tool. The lubrication passage extends through an anvil assembly of the impact tool, along an axis of rotation of the impact drive mechanism. The at least one lubrication channel extends away from the lubrication passage and delivers the lubricant to at the impact mechanism. The front lubrication assembly is accessed on a front end of the impact tool. The anvil assembly may be a split anvil assembly having an external anvil portion and an external anvil portion.

Abstract: The present invention relates to a method for producing an abrasive. The abrasive is embedded into silazane resin that has been coated onto a work surface. The abrasive may include abrasive particles such as diamond or cubic boric nitride and may additionally include silazane resin which is then embedded in the silazane resin coating.

Abstract: Apparatus and method are provided for making rf contact between the ground plane surface of a microwave-monolithic-integrated-circuit chip and a test fixture. The test fixture includes a chip support with a planar surface, a chip stop with a wedging surface, a clamp-release lever with a wedging surface, and a spring. The conductive ground plane surface of a MMIC chip is pressed against a planar surface with a contacting force that is a function of a clamping force that is applied to one of the wedging surfaces, and that is a function of angles of the wedging surfaces. Heat applied to the MMIC chip cooperates with the contacting force to provide a suitable rf connection between the ground plane surface of the chip and the planar surface of the test fixture.

Abstract: A spreader bracket for positioning concrete forms for concrete foundations, particularly the stem wall of a housing foundation. The spreader bracket is fabricated in the fashion of a strut to elevationally support and space an inner form member from an outer form member, the strut being fastened to the outer form member and its associated stake bracing to permit the inner form member to be properly supported above a slab bed, and to be easily removed after initial set of the concrete pour with minimal damage to the slab and stem wall.

Abstract: A protractor consisting of a flat base having two straight edges and a degree scale, a measuring arm mounted on the base for rotation about a pivot point and having straight edges for cooperating with the straight edges of the base to form angles corresponding to angles to be measured, an indicator arm mounted on the measuring arm for rotation about the pivot point, and having an indicator mark, and locking means for fixing the indicator arm in plurality of predetermined positions on the measuring arm so that, in each position, the angle indicated by the mark on the scale coincides with the angle formed between one of the straight edges of the base and one of the straight edges of the measuring arm.