Abstract: The present invention is an apparatus and method for an improved actuator arm assembly in a disc drive. The improvement arises by casting a steel sleeve into the actuator arm to define a pivot bore. A steel bearing and shaft assembly cooperates with the pivot bore to enable the actuator arm to rotate about the shaft. This all steel arrangement minimizes the bearing preload necessary to create a stable actuator arm assembly having a minimum amount of friction in the bearing system.

Abstract: An alumina substrate has a front surface with a semiconductor gas sensor main body attached thereon for specific detection of a surface exposed gas, and has a rear surface formed with a glass layer and a gold paste layer as superposed on the surface, and bonded to a gold plating layer on a frame by parallel gap welding. The gold paste layer is welded to the gold plating layer with the heat of welding. The glass layer prevents transmission of thermal impact of die bonding to the substrate.

Abstract: A pneumatic power tool that includes fluid conveying passageways formed by casting grooves in the tool exterior and then molding an elastomeric material over the grooves to enclose the passageways.

Abstract: A piston is formed in two parts. The main part is formed by gravity die casting from aluminum or aluminum alloy and a second part of the piston is formed by a squeeze casting process to produce a material which is stronger and more resistant than the gravity die cast aluminum or aluminum alloy. At least one piston ring groove is formed in the second part. The two parts are then electron beam welded together to form the complete piston. The squeeze cast portion may be reinforced with whiskers or fibres to further improve its properties. This method of construction has the benefit that only the minimum amount of the piston is formed by the more expensive and time-consuming squeeze casting process so that parts of the piston which do not require the improved properties given by squeeze casting are simply gravity die cast. This is of particular benefit in large diesel pistons.

Abstract: A cylinder unit of a cylinder-piston-combustion engine comprises a cylinder housing and a lining unit inserted into the cylinder housing. The lining unit consists of a cylindrical liner sleeve and a terminal wall and encloses a combustion space. The terminal wall is integral with the liner sleeve. The lining unit is manufactured by a non-cutting manufacturing method like cold impact forming, hot impact forming, deep drawing, tube reshaping, press molding or injection molding.

Abstract: The reinforcement of the crown of a piston of aluminum or aluminum alloy for an internal combustion engine comprises the preparation of a reinforcement member (10, 13) which is provided with apertures (11, 14), or reentrants. The reinforcement member is placed in a crown-forming part (18) of a piston die in a squeeze casting apparatus and the piston is squeeze cast. The molten metal penetrates the apertures, or enters the reentrants, and these are so shaped that when the molten metal has solidified, keys are formed which connect securely the reinforcement member to the aluminum or aluminum alloy. Further reinforcement members can then be readily brazed or welded to the first reinforcement member.

Abstract: An improved method of manufacturing a swash plate assembly for use in a compressor, fluid motor or similar device in which a plurality of pistons are connected, by means of connecting rods, to a swash plate which drives (or is driven by) the pistons. A plurality of piston and rod assemblies are made by casting the piston around one end of a connecting rod which is formed with a ball at both ends, thus providing a ball-socket connection therebetween. The pistons are finish machined. A die-insert is utilized to locate the ball and rod prior to casting, and is thereafter moved along the rod to contact the other ball end. This insert thus serves to locate the rod section with the affixed piston in a mating socket of a swash plate die. The swash plate is cast about a plurality of such piston bearing rods to a carefully toleranced dimension. The swash plate end of the assembly is then finish machined.

Abstract: Techniques for forming one piece connecting rods for coupling a piston and crankshaft to convert between reciprocating and rotary motion as might be used in an internal combustion engine or piston-type compressor are disclosed wherein the connecting rod is formed of a lightweight material such as aluminum, which material is of an inadequate hardness to form a roller bearing race. The rod includes an elongated arm portion having enlarged annular portions at opposite ends thereof and with one of those annular portions having an inner surface for receiving, in a press fit manner, a hardened steel liner to provide an outer bearing race. Rollers are then interposed between this outer race and an eccentric portion of a crankshaft while the other enlarged annular portion receives a roller bearing assembly for connection to a piston wrist pin.

Abstract: A carburetor is disclosed as being formed by die casting and in the process employing two opposed juxtaposed casting cores to form the induction passage and main venturi therein with the result that a flashing of die case metal occurs as between the opposed juxtaposed cores generally transversely of the induction passage generally at the location of the throat of the venturi; after casting the carburetor, the carburetor is placed onto fixture means and a cutting and forming punch or tool is moved relative to the carburetor as to both cut through the said flashing and also seat against the metal of the upstream portion of the venturi in order to assure uniformity of contour thereof especially with respect to the venturi throat as cut and sized by the tool.

Abstract: A method of processing the end and joint portion of a decorative molding comprising a synthetic resin base having laminated thereon a layer of metal foil is disclosed. In accordance with the invention areas of reduced thickness are formed in the moldings to be joined such that a substantially level joint can be formed without using a separate joining member.

Abstract: A fastener adapted to be affixed to a hard wall, such as a concrete wall, has a base through which at least one hole extends. A bushing is releasably held in the hole at one end thereof, and extends outwardly, and a pointed pin is held in the center hole of the bushing. The bushing guides the pin into the wall, upon impact. The hole in the base and the bushing may be provided with flanges to inhibit their relative separation. A hinged cover may be provided on the base, to cover the bushings and pins when the fastener is affixed to a wall. In one method for making the fastener, a plurality of bushings are die cast with interconnecting gates, and the interconnected bushings are employed to serve as part of the die for die casting the base, whereby the gates become imbedded in the base to form a frangible means for holding the bushings in the base.