Abstract: An amplifier arrangement for amplifying an input signal to an output signal for delivering to a load is disclosed. The amplifier arrangement comprises a power splitter configured to receive the input signal and produce split input signals. The amplifier arrangement further comprises a first amplifier branch comprising multiple main amplifier circuits. Output signals of the multiple main amplifier circuits are combined to generate a first output signal. The amplifier arrangement further comprises a second amplifier branch comprising at least one auxiliary amplifier circuit. The at least one auxiliary amplifier circuit is configured to receive a split input signal from the power splitter and produce a second output signal. The amplifier arrangement further comprises a power combiner configured to receive the first and second output signals and produce the output signal for delivering to the load.
Abstract: A method for suppressing POP noise in an audio operation amplifier, comprising: connecting a first resistor and a second resistor in series at an output stage of the audio operation amplifier by turning on a first switch and a second switch; generating, with a ramp generator, a ramp voltage after an audio signal is input into the audio operation amplifier, wherein the ramp voltage varies from zero to a first value; generating, with an voltage generator, a second voltage, wherein a third switch is turned on and a fourth switch is turned off when the ramp voltage reaches the second value; short-circuiting the first and second resistors by turning off the first and second switches; and outputting, with the audio operation amplifier, an amplified audio signal.
Abstract: A form for creating a postcard having printing on both sides includes a front sheet and a back sheet, which are laminated using a pressure sensitive adhesive on a back surface of the front sheet. A fold line extends across the front sheet, while a tear line underlying the fold line extends across the back sheet. A gap in the adhesive preferably extends along the fold line. On one side of the fold line opposite to the direction of the gap, the inner surface of the back sheet has a release coating restricting the adhesion of the adhesive layer. After printing on the front surface of the front sheet, the section of the back sheet having this release coating is removed and discarded, and the front sheet is folded along the fold line, thereby providing a document having printing on both sides and a thickness sufficient for a postcard.
Abstract: An interconnecting post for mounting a microelectronic device such as an integral circuit chip is fabricated with generally uniform cross-section, by forming a first layer of positive photoresist on a substrate, soft-baking that first layer and exposing it for a short time with a wide-apertured mask or simply a UV blank flood exposure. Without developing the first layer, a second layer of positive resist is then applied over the first layer, soft-baked, and then exposed with a narrow-apertured mask. During the soft-baking of the second layer, some of its activator in the photoresist compound diffuses into the exposed portion of the first layer and modifies its solubility in such a way that, when the layers are subsequently developed, the developer partially undercuts the unexposed portion of the first layer to form in the photoresist an opening of generally uniform cross-section. This opening can then be filled by plating to produce a strong, integral interconnect post.
October 12, 1995
Date of Patent:
March 3, 1998
William T. Chou, Solomon I. Beilin, David A. Horine, David Kudzuma, Michael G. Lee, Larry Louis Moresco, Wen-chou Vincent Wang
Abstract: A system is disclosed for binding together sheet-like articles such as photos or documents. The system includes a back cover, a front cover and a spine member attached to one cover. Such spine member has an "edge-binding" medial portion and a cover-adhering strip. Such strip attaches to the other cover after the articles are placed between the covers for binding. The cover-adhering strip and the medial portion (both overlaid with a protective release liner removed just prior to strip use) are divided by a lateral cut into at least two portions. With one hand, a user of the system may securely hold the covers and articles aligned and using the other hand, remove the release liner and in sequence, fold over the slit-divided medial portion and the strip portion to contact the article edges and the other cover, respectively. The system adheres to and secures the articles and the covers together. A method for binding sheet-like articles is also disclosed.
Abstract: The present invention is a method of making a molded part having a sheet metal portion and at lease one fastener coupled to the sheet metal portion. The fastener has a body portion and an annular barrel portion which extends from the body portion. The body portion has a free open end and a bore extending therethrough in generally coaxial alignment with the opening in the barrel portion. The barrel portion free end is driven into the sheet metal to pierce the sheet metal and form a slug from the sheet metal. The barrel is also deformed radially outwardly in mechanical interlocking relation with the panel. The slug which is formed is wedged into the opening of the barrel portion to seal the barrel portion. The sheet metal and barrel portion can then be surrounded with molding material with the slug preventing the molding material from flowing into the bore.
Abstract: Disclosed herein is a method of machining and assembling members of a solenoid fuel pump to produce a magnetic gap length between an armature assembly which includes an armature member having first and second axially spaced end surfaces, and a radially outwardly extending surface forming a part of a housing member having an axis and including an axial bore defined by an inner surface having therein a magnetic gap defined, in part, by the radially outwardly extending surface which extends from the inner surface, and having a counterbore located in spaced axial relation from the radially outwardly extending surface and defined, in part, by an annular shoulder, which method comprises the steps of fabricating the housing member with the axis and including the axial bore defined by the inner surface having therein the magnetic gap defined, in part, by the surface extending radially outwardly from the inner surface, and the counterbore located in spaced outward axial relation from the radially outwardly extending s
Abstract: A method of making a printed circuit board and heat sink structure by initially providing the board with a heat conductive layer oh each of its two sides, the two conductive layers thermally interconnected by heat conductive material extending through holes in the board. An electronic component is mounted spaced apart from the conductive layer on one side of the board and is thermally connected to that layer by a thermally conductive viscous substance injected through a hole from the other side of the board. The viscous material flows in a reverse direction through other holes in the board. A heat sink is then attached by thermally conductive material to the conductive layer on the other side of the board. A method is also included of injecting a thermally conductive curable resin between an electronic component and a printed circuit board with a release agent between the component and the resin.
Abstract: A mounting portion (protruding portion provided with a through hole) of a magnetic head assembly is fitted into an insertion hole formed at the forward end of a carriage arm, and a thus-produced inlay portion is disposed between adjacent first members having a V-shaped slit. A second member is pushed into the V-shaped slit of each first member and the magnetic head assembly is pressed against the carriage arm by the expanding force of the slit portions of each first member which is produced in proportion to the amount of insertion of the second member, and the magnetic head assembly is held in a fixed state. In this state, a caulking ball is press-fitted into the through hole of the protruding portion with a caulking pin so as to caulk the inlay portion. The magnetic head assembly is pressed against the carriage arm perpendicularly thereto.
Abstract: The invention is a device for replacing the seat for an oil plug frequently found as part of an oil pan of an internal combustion engine to allow draining and includes a hollow cylinder having a shoulder for insertion through the existing seat to extent into the oil pan, an installation bolt is employed for compressing and expending the hollow cylinder outward to fixedly secure the hollow cylinder to the existing seat between the shoulder and expended cylinder and the cylinder being internally threaded adjacent the shoulder to accept a plug.
Abstract: A method for producing a bicycle brake arch and fork legs assembly. The method comprises the steps of first forming a low-tolerance brake arch and two low tolerance fork legs separately, and then bonding the brake arch with the two fork legs in high-precision alignment and orientation with a structural adhesive.
April 17, 1995
Date of Patent:
August 5, 1997
Answer Products, Inc.
Scott M. Boyer, Gerald M. Stewart, Mark Van Kampen, Kirk Allen
Abstract: A method for assembling a substantial barrier to the flow of liquid in a circumferentially-extending liquid conduit groove of a mold insert includes forming recesses or undercuts by undercutting the sidewalls of the liquid conduit groove, inserting a plate-like liquid dam within the liquid conduit groove, and clamping the dam in the liquid conduit groove by the use of a pair of locking screws or pins that extend through bores in the dam into engagement with inwardly-facing surfaces of the undercuts. The relationship between the inwardly-facing undercut surfaces and the locking members is preferably such that there is a progressively increasing interfering engagement of the locking members with the undercut surfaces resulting in increasing clamping pressures applied to the dam assemblies.
Abstract: A frame member of rectangular cross section with rounded corners is formed by expansion of a tubular blank within a die cavity having an inner portion of corresponding cross section and an outer transition portion which is of smoothly continuously curved cross sectional profile elongated substantially parallel to the larger dimension of the rectangular section. An outer portion of the tubular blank is deformed to correspond with the continuously curved cross sectional profile and is sealed by a resiliently compressible sealing element of corresponding profile through which fluid pressure is applied in order to expand the blank. By matching the profile of the transition portion to the rectangular inner portion, the transition portion can be made shorter and considerable savings of materials and resources can be achieved.
Abstract: A shield for use in connection with a workholding apparatus that has a base having a longitudinal slot and at least two jaw members operably supported on the base for selectively clamping a workpiece therebetween. The shield comprises a plate member adapted to be removably received on the base and configured to permit at least one jaw member to move relative thereto. The plate member may be sized to provide the workholding apparatus with a worksurface that is wider than the base, the plate member having an opening to permit movement of the jaw members such that it is completely covered by the cooperation of the jaw members and the plate to prevent debris from entering the longitudinal slot of the base. Alternately, the opening is provided with grooves for slidably guiding a telescoping cover plate which is attached to movable support members and is cooperated with the cover plate to completely cover the longitudinal slot during the clamping operation.
Abstract: A method of covering for a flower pot with a floral grouping disposed therein and extending a distance above an upper end of the flower pot wherein the flower pot has a lower end and an outer peripheral edge. The covering includes a sheet of material having an upper surface, a lower surface and an outer peripheral edge with a sheet extension connected to the outer peripheral edge of the sheet of material and extending a distance from the outer peripheral edge of the sheet of material. The sheet of material is formed about the flower pot to a position wherein the sheet of material extends about substantially the entire outer peripheral surface of the flower pot to provide a decorative covering and the sheet extension is formed about the floral grouping to a position wherein the sheet extension extends about a substantial portion of the floral grouping to provide a protective covering.
Abstract: A covering for a flower pot with a floral grouping disposed therein and extending a distance above an upper end of the flower pot wherein the flower pot has a lower end and an outer peripheral surface. The covering includes a sheet of material having an upper surface, a lower surface and an outer peripheral surface with a sheet extension connected to the outer peripheral surface of the sheet of material and extending a distance from the outer peripheral surface of the sheet of material. The sheet of material is formed about the flower pot to a position wherein the sheet of material extends about substantially the entire outer peripheral surface of the flower pot to provide a decorative covering and the sheet extension is formed about the floral grouping to a position wherein the sheet extension extends about a substantial portion of the floral grouping to provide a protective covering.
Abstract: An air driven diaphragm pump having two diaphragms joined by a common control shaft to reciprocate in opposed chambers for pumping material through check valve ported cavities. An actuator valve is associated with the central housing of the pump and includes a valve cylinder within which a valve piston reciprocates. The valve piston is caused to reciprocate by alternate venting of the ends of the cylinder. Enlarged air chamber passages are controlled by the control shaft to vent the ends of the valve cylinder. A cylindrical portion of the control shaft includes axial slots for venting alternate ends of the valve piston. Annular channels manifold air to and from the axial slots. The actuator housing is molded about the center bushing for the control shaft and includes inwardly extending portions. Annular passages are then machined in the bushing for sealing channels to receive O-rings. The O-rings extend to seal against the housing directly at the floor of the sealing channels.
Abstract: An apparatus is disclosed for supporting a group of sheet-like articles such as photos or documents for binding. The apparatus includes first and second holding members defining a first slot therebetween. This first slot has a first fixed dimension. The apparatus also includes a third holding member spaced from the second holding member and defining a second slot therebetween. The second slot has a second fixed dimension. The holding members preferably extend away from a base member. Additionally, the apparatus can include a back member extending across the holding members. The apparatus can be used to align the edges of the articles and support the articles for binding.
Abstract: A secondary connector block of the type that is used to reinforce a port through a thin wall so that a mating primary connector block which has a bolt hole offset to the side of a refrigerant line can be used to connect the line concentrically to the port. The secondary connector block consists of a completely cylindrical base with an intermediate annular groove circling its outer surface. The base can be turned on a lathe, since it is completely symmetrical about its axis. The base is first welded concentrically to the port, which is easily done, since no part of the base overhangs the surface of the wall. The side lobe which contains the bolt hole that aligns with the primary block is attached later by a pair of bendable legs that are formed around and into the groove. The legs may be wide enough to fit very tightly into the groove, in which case the side lobe is first turned to the orientation that aligns the bolt holes.
December 19, 1994
Date of Patent:
February 18, 1997
General Motors Corporation
Anh Le, Richard L. Marker, Richard J. Raterman
Abstract: The invention relates to a security document, in particular a bank note, identity card or the like, having a security element which is provided with characters, patterns, etc., visually readable at least in transmitted light and which is electrically conductive and bears additional substances for machine testing, and to a method for producing such a security element. The security element preferably consists of a transparent film strip that bears negative writing readily capable of visual checking and is additionally provided with electrically conductive and magnetic substances.
August 2, 1994
Date of Patent:
February 4, 1997
GAO Gesellschaft Fur Automation und Organisation mbH
Wittich Kaule, Michael Boehm, Walter Schneider, Theodor Burchard