In a heat exchanger for exchanging heat between a fluid, such as a refrigerant, and air, an object is to increase the surface areas of the fins while suppressing an increase in draft resistance, so as to attain the improvement of performance. To this end, corrugated sheet fins (70) are used as the fins of a heat exchanger (60). The fins (70) are shaped in corrugated form, and the direction of their edge lines is orthogonal to the leading edge and trailing edge. In the heat exchanger (60), a plurality of corrugated sheet fins (70) are disposed at a fixed pitch axially of heat transmission pipes (61).

Heat exchanger, and air conditioner

A personal sound system comprising a garment adapted to substantially cover a person's upper torso, a first pocket for removably supporting a first speaker on the garment in the vicinity of a person's left shoulder, a second pocket for removably supporting a second speaker on the garment in the vicinity of the person's right shoulder, a third pocket for removably supporting an electrical signal producing device on the garment and an elongated flap extended from the third pocket to the second pocket and through that portion of the garment encircling the person's neck and to the first pocket for removably supporting flexible wires on the garment, which wires are adapted to interconnect speakers located in the first and second pockets, and an electrical signal producing device located in the third pocket, while permitting those wires to be readily removed from the garment when the garment is to be cleaned. Preferably, the flap is located on the interior surface of the jacket. In the alternative, the flap may be replaced by an elongated pocket located on the exterior surface of the garment which pocket is closable by an elongated zipper.

Personal sound system

In accordance with the present invention, multilayer printed circuit boards are provided, the structure of which comprises a plurality of layers (a)-(c) as follows, so as to achieve the desired multiplicity of layers: (a) a bottom circuit layer; (b) a via interconnect layer; and (c) a top circuit layer. In another aspect, the present invention is directed to a multilayer printed circuit board with an attached component or die, the structure of which comprises: (a) a single or multilayer printed circuit board substrate; (b) a via interconnect layer which has electrically conductive adhesive compositions patterned into suitable dielectric materials, where the suitable dielectric materials provide adhesion between the printed circuit board and a component or die while the electrically conductive adhesive compositions provide the electrical interconnection and adhesion between connecting pads of the printed circuit board substrate and the attached component or die; and (c) an area array component package or bare die which is attached to the printed circuit board layer with the use of said suitable patterned dielectric materials.

Vertically interconnected electronic assemblies and compositions useful therefor

A shaft-mounted rotor assembly for an electric motor and method of manufacturing the same wherein arcuate permanent magnets are positioned in angularly related adjacent positions to surround the outer periphery of a shaft-mountable rotor core, and a plastic molded sleeve encapsulates the exposed outer peripheral surfaces of the magnets to secure them in fast position on the core.

Dynamoelectric machine rotor assembly with improved magnet retention stucture

An apparatus for forming a frame member for an automobile from a tube blank applies internal hydraulic pressure to the blank, tangent bends and preforms the internally pressurized blank into a preformed tube having a desired horizontal profile configuration, then forms the preformed tube into a finally formed frame member having a desired vertical profile configuration and a desired, varying cross-sectional configuration by placing the preformed tube in a stuffing ledge apparatus having a lower die with an upwardly facing ledge and vertically extending, punch engaging surfaces and a punch having a downwardly facing ledge and vertically extending, die engaging surfaces, internally pressurizing the tube, and then ramming the punch downwardly to form the tube into the finally formed frame member, the ledges and vertically extending surfaces substantially completely enclosing a portion of the tube before and while the punch and die come together to form the tube into the finally formed frame member. The forming components in each apparatus are submerged in an aqueous bath, allowing the blank and tube to automatically fill themselves, thereby facilitating sealing and pressurizing of the tube.

Apparatus and method for forming a tubular frame member

A method for jointing two pipes such as an aluminum pipe and a copper pipe by friction welding. The aluminum pipe is inserted into a bore of a ring made of a heat resistant material, the bore having a straight section and a tapered section continuous from the straight section. The copper pipe has a tapered end peripheral surface. The copper pipe is pressed at its tapered end, in a rotating state, against the end of the aluminum pipe so as to expand the latter. As a result, an ironing is effected on the aluminum pipe by the straight section of the bore of the ring, such that the aluminum pipe overlies the straight section of the copper pipe in close contact with the latter. Consequently, the tapered surface of the copper pipe is friction welded to corresponding portion of the aluminum pipe while the latter is being backed up by the tapered section of the bore of the ring.

Method of jointing pipes by friction welding

A rotor for an electric motor including an iron core having collar portions at both end portions thereof, and a magnet placed on the outer periphery of said iron core The magnet is held at both end portions thereof between the collar portions

Rotor for electric motor

A method for pressure bonding metal members by utilizing eutectic reaction comprising the steps of bringing two metal members of dissimilar metals to be bonded into contact with each other under a predetermined contacting pressure P1 lower than the plastic deformation pressures of the metals of the two members and heating the contacting surfaces of the two members to a temperature lower than melting point temperatures of the metals and not lower than the eutectic temperature thereof to produce a liquid of eutectic composition by eutectic reaction between the surfaces of the two members to be bonded, applying an upset pressure P2 higher than the contacting pressure P1 to the surfaces to be bonded to squeeze out the liquid from the contacting surfaces of the two members to outside, and cooling the bonded surfaces of the two members. When the members to be joined by pressure bonding are of the same metal, an insert comprising an element undergoing eutectic reaction with the metal of the two members is interposed between the surfaces of the two members to be bonded.

Method for pressure bonding metal members by utilizing eutectic reaction

A fluid pressure reducing device having a core provided with a peripheral spiral groove and a pipe receiving the core. The portion of the pipe receiving the core is radially contracted so that the ridges of the spiral groove of the core intrude into the inner peripheral surface of the pipe, thereby to form a spiral passage between the pipe and the core. The pressure of a fluid is reduced as the latter flows through the spiral passage. This fluid pressure reducing device is easy to produce and permits an easy fine adjustment of the flow resistance.

Method of producing a fluid pressure reducing device

A fin-and-tube type heat exchanger is disclosed in which the height of each raised, slotted louver from a fin base portion continuously changes in a direction crossing at right angles both the direction of the air flow and the direction of lamination of fins, and two or three kinds of such louver pairs, each consisting of louvers symmetric with each other with respect to the fin base portion, are arranged regularly.

Izumi Ochiai

Papers

Method of jointing pipes by friction welding

Rotor for electric motor

Method for pressure bonding metal members by utilizing eutectic reaction

Method of producing a fluid pressure reducing device

Fin and tube type heat exchanger