摘要:
A software implemented control mechanism is used in a test system for assigning unique pre-established electronic addresses which are to be written into the memory elements of printed circuit boards during the manufacture thereof. Each PCB is previously encoded with a scannable board serial number label, and the test system includes a processing unit and a memory configured for storing test software for testing PCBs. The control mechanism is incorporated into the test software which when installed into the test system configures the system's memory for assigning electronic addresses. The control mechanism includes first and second sets of tables containing entries which define the ranges of valid serial numbers and preallocated electronic addresses. A control element within the control mechanism invokes a number of offset computation subroutines which generates an offset value derived from the serial number read from the PCB being processed defining the relative position of the serial number as determined by entry values contained in the first set of tables. The control element provides the received offset value to a number of effective address subroutines which it invokes to select a valid unique electronic address value contained in the ranges of pre-established electronic addresses defined by the entry values contained in the second set of tables.
摘要:
A "U" shaped unitary bracket is arranged for mounting about a forward edge of a window sill utilizing an adhesive strip mounted to a bottom surface of a first plate extending beyond an underlying parallel second plate. Connector fasteners are orthogonally directed through the second plate for securement to a bottom surface of the window sill. A modification of the invention includes a window box structure mounted to a connecting web of the first and second plates, with the window box including a rear wall mounting a plurality of sockets in a parallel relationship relative to the second plate utilizing threaded extender rods arranged for projection and in engagement with a rearwardly oriented vertical wall surface to align the window sill box relative to the associated window. A further modification of the invention includes an irrigation conduit structure positioned in an adjustable relationship overlying the window box for the continuous directing of irrigation fluid into the window box structure.
摘要:
A method for achieving printed circuit (PC) board-level testability through electronic component-level design using available technological methods to effect a state of transparency during test, allowing precise verification and diagnosis on a component-by-component basis. Applicable to a greater variety of electronic products than other test methods, and not appreciably constraining functional design, this approach inherently avoids obstacles which prevent other techniques from fulfilling their objectives. This method is applicable to analog or digital electronic components and circuits and results in the ability to largely combine component level and board level test development efforts, a reduction in the need for exhaustive component testing prior to board assembly, the applicability of a single tester configuration to a number of product types, the ability to substitute a verified component for a suspect one without removal, and the ability to detect marginally operative components which have not yet affected board functionality. This method allows the production and stocking of a single set of compatible electronic components to be used in place of existing electronic components as well as allowing existing electronic designs to be converted to this test method by substituting compatible electronic components for all existing electronic components.
摘要:
Several important features and characteristics, particularly and pronouncedly environmental stress crack resistance (i.e., "ESCR") as well as other desirable physical properties of blends or intimate admixtures, known as "polyblends" and usually made by melt-blending, of various styrene polymers (i.e., "SP's"), notably homopolystyrene (i.e., "PS"), and thermoplastic elastomers (i.e., "TE's") are significantly and in emphasized measure enhanced by thorough incorporation in (and simultaneous or subsequent heat action-initiating and cross-link-effecting of) the styrene polymer-thermoplastic elastomer polyblend in low level concentration(s) of a thermally-activatable, organic peroxide in combination with any one (or even a mixture) of an optimizing cross-linking supplement provided in effectively reactive amounts of, for illustration, either a styrene (or the like alkenyl aromatic) monomer or a reagent that is reactive towards alkenes (such as certain dithiols, amino-derivatives, etc.) or certain decomposable-type reagents (such as hexachloroethene). Besides noteworthy improvement in ESCR, the tensile strength (including tensile yield--i.e., "T.sub.y " and tensile rupture--i.e., "T.sub.r "), elongation (i.e., "% Elong.") and practical toughness (as measured by Gardner Impact Strength values) are amongst the significant physical properties thus ameliorated in the styrene polymer-thermoplastic elastomer polyblends.
摘要:
A rectangular air inlet control plate is pivotably mounted in the air intake passage of a forced air furnace to control the air intake volume and, thereby, insure optimal combustion of the fuel in the furnace. The plate is adjustably counter-balanced to a closed position and is further adjusted to allow the optimum volume of air intake during operation of the forced air furnace. The rectangular shape of the plate provides for fast opening and closing of the air intake during startup and shutdown transients, since the actuation angle of the plate is reduced in proportion to its length. The plate is mounted in a funnel-shaped air intake structure to reduce the noise and allow a maximum volume of air to enter the intake. A windscreen is mounted on the funnel-shaped air intake in order to act as a turbulence breaker for the incoming air, and also to prevent ingestion of large debris into the air intake.
摘要:
There is disclosed a new and improved envelope processing machine. The machine includes a processing station arranged to present each envelope in an opened condition to an operator in one-by-one relation to facilitate the removal of contents from or the insertion of materials into the envelopes by the operator. A detecting means downstream from the processing station acts upon the envelopes one at a time for sensing a predetermined event corresponding to the suspected absence of complete removal of the contents from or complete insertion of materials into the envelopes. An illumination means actuable in response to the detecting means sensing the predetermined event is arranged to direct light through the envelopes to afford visual verification of the predetermined event by the operator.
摘要:
There is disclosed a new and improved envelope processing machine. The machine includes a supply hopper for retaining a quantity of envelopes to be processed, an envelope processing station, means for removing envelopes from the supply hopper and for transmitting the removed envelopes to the envelope processing station, and envelope opening means at the processing station including a pair of reciprocating envelope gripping means arranged to grip and separate opposite panels of an envelope to facilitate the removal of the contents therefrom. The envelope gripping means include bending means for bending the envelope panels inwardly as the envelope panels are separated for displacing the envelope contents from the envelope panels towards the center of the opened envelope. As a result, the envelope contents are disposed within the opened envelopes in a position which enables convenient grasping of the contents by an operator.
摘要:
A personal visibility mark may increase the visibility of a person in the water to operators of watercraft or the like and may be used in combination with a personal floatation device. The personal visibility mark may include a housing including at least one intake opening. The housing may be removeably coupled to a personal floatation device or may be an integral component of the personal floatation device. A pump may be disposed within the housing and may be fluidly coupled to the intake opening and at least one nozzle for expelling a stream of water from the nozzle to increase the visibility of a user. The stream of water may include an interrupted stream. The interrupted stream may be provided by modulating the power to the pump and/or providing a self-resonating nozzle.
摘要:
A method and apparatus allows adapting a standard flying prober system to manually or automatically determine the likelihood of error free probability of test point targets on Printed Circuit Assemblies (PCA's) which may have significant planarity irregularities. The method and apparatus provides a corrective function allowing error free probing of test target points on PCA's having planarity irregularities which otherwise make them impractical to test. The method and apparatus involves utilizing the camera system typically provided with a flying prober system and an auxiliary sighting system each having different optical axis angles, the use of which allows determination of height values.
摘要:
The disc brake cooling system for a vehicle with hydraulic brakes has a sealed circular cooling system employing a piston pump which produces a very rapid flow of brake fluid through the brake lines and calipers constantly during non-braking of the vehicle. After braking, the constant rapid flow of the fluid cools the temperature of the fluid, and hence of the brakes, over the course of the rapid circular motion through the system so as to prevent boiling of the fluid.