Abstract:
A fan control board and circuit having a central low voltage wiring center as well as a safety interlock for electric heater in which the interlock uses diodes to ensure proper fan operation in the event of miswiring of the heater sequencers. Another feature of the invention is a quick connect for a time delay of the circuit which permits easy insertion and removal thereof for replacement and/or cleaning.
Abstract:
A printed wiring board is mounted with an electronic component which is provided with grooves at the opposite sides thereof. The grooves are constructed so that the electronic component can be mounted on the printed wiring board in either the vertical or horizontal directions. Preferably, the grooves have a cross-shaped configuration, one extending vertically and one extending horizontally. The grooves may be formed on tongue pieces projecting from the electronic component body. The groove may be provided with a resilient piece. Another groove may be provided on the body so as to be capable of changing the direction of terminals.
Abstract:
A push-button switch wherein proper operation is always assured. The push-button switch includes an insulating case of an enclosure structure having a side wall from which a plurality of connecting terminals and a dummy terminal are exposed outside. The insulating case further has a first recess formed in a lower face thereof on the side of the dummy terminal which opposes to a printed circuit board to which the push-button switch is soldered, and a second recess formed in the first recess and located below the dummy terminal. A projected step portion is provided around the dummy terminal and has a side face having a sufficient height to prevent flux of cream solder from advancing to the location of the dummy terminal. Upon soldering, flux will be retained in the first and second recesses of the insulating case and between the projected portion and the side wall on which the stepped portion is provided and will not stick to any portion around the dummy terminal thereby to assure communication of air between the inside and the outside of the insulating case after soldering by way of a fine gap between the dummy terminal and the insulating case.
Abstract:
A backplane has several socket connectors arranged in parallel, side by side on a side that faces the module and at least one bus that comprises several bus lines. An outer row of contact pins that function as bus contact pins are always shorter than the contact pins of a middle rows of contacts. The bus contact pins of each socket connector of the backplane line up with auxiliary contact pins. The auxiliary contact pins belong to one bus and are electrically connected with a bus line. The bus contact pins of each socket connector are electrically connected to the corresponding auxiliary contact pins via contact means which can be moved with a handling means. Thus, the modules can be separated from a bus that extends beyond the modules without having to pull out the modules from their plug-in locations on a module carrier.
Abstract:
A circuit board, for an electronic timepiece, having a switching electrode formed on a narrow peripheral surface of the circuit board. The narrow peripheral surface has a pair of spaced indentations, and the switching electrode is comprised of a metallic layer disposed on the indentation surfaces and on the portion of the narrow peripheral surface between the indentations. The switching electrode is fabricated by forming a pair of spaced small holes through a circuit board base plate, and by forming a large hole having a diameter greater than a distance between the pair of small holes and positioned for intersecting the pair of small holes. A conductive layer is plated on the surfaces defining the pair of small holes and on that portion of the surface which defines the large hole that is between the pair of small holes. The final shape of the circuit board is then press cut from the circuit board base plate along a line of cutting which passes through the pair of small holes and the large hole so that the conductive layer is disposed on a portion of the narrow peripheral surface of the finished circuit board having a pair of indentations corresponding to the pair of small holes, and the conductive layer defines a switching electrode.
Abstract:
A circuit board, for an electronic timepiece, having a switching electrode formed on a narrow peripheral surface of the circuit board. The narrow peripheral surface has a pair of spaced indentations, and the switching electrode is comprised of a metallic layer disposed on the indentation surfaces and on the portion of the narrow peripheral surface between the indentations. The switching electrode is fabricated by forming a pair of spaced small holes through a circuit board base plate, and by forming a large hole having a diameter greater than a distance between the pair of small holes and positioned for intersecting the pair of small holes. A conductive layer is plated on the surfaces defining the pair of small holes and on that portion of the surface which defines the large hole that is between the pair of small holes. The final shape of the circuit board is then press cut from the circuit board base plate along a line of cutting which passes through the pair of small holes and the large hole so that the conductive layer is disposed on a portion of the narrow peripheral surface of the finished circuit board having a pair of indentations corresponding to the pair of small holes, and the conductive layer defines a switching electrode.
Abstract:
A switch assembly connectible to a circuit board comprisesA. an insulative strip containing first, second and third openings spaced apart in a row,B. two electrically conductive metallic prongs respectively extending through the strip via the first and third openings, andC. a fastener having a threaded shank extending into the strip via the second opening and having an electrically conductive head adapted to engage or disengage both prongs at one side of the strip depending on the extent of rotation of the shank relative to the strip.
Abstract:
Electrical conducting paths of a metallic composite, which includes an electrically conductive material and a refractory metal, are formed on an insulative base in a predetermined pattern.