Abstract: A cooling apparatus for cooling a plurality of electronic devices each having a large heating value and a small area, capable of effectively cooling the semiconductor chips with the use of a single cooler, comprises a plurality of thermal conductors mounted on the electronic devices and formed with thermal conductive fins, a housing formed with fins fitted with the fins of the thermal conductors, and a cooling device mounted on the housing, for removing heat from the electronic devices, wherein the housing is formed therein with a plane heat-pipe.

Abstract: A fastener structure for fastening a first member and a second member using a taper implant having a threaded hole therein. The taper implant has a frusto-conical outer surface, a projecting portion connected to a larger diameter end and a threaded hole passing therethrough. The first member has a wall portion with a tapered hole extending therethrough and a counterbored portion adjacent a larger diameter end to receive the projection portion of the taper implant. The taper implant is inserted into the hole of the first member and held therein by frictional contact. The second member has a wall portion with a hole therethrough. The second member is positioned in contact with the first member and the two members are fastened together by inserting a male screw through the hole of the second member and threading the male screw into engagement with the threaded hole of the taper implant.

Abstract: A taper implant of the invention comprises a taper portion having an outer surface being frustconical in shape, a flange portion formed at an outermost end of the taper portion on the larger-diameter side to project outward with respect to the taper portion and having a flat surface lying perpendicularly to the axial direction of the taper portion, and female threads serving as a fit portion extending in the axial direction of said taper portion. A hole taper portion and a hole step portion are drilled at the same time to bore a hole in one of members to be fastened, and the taper implant is driven into the hole, thereby providing a screw-fastening structure for the fastened members. The taper implant ensuring good working efficiency is achieved.

Abstract: A method of fastening a first member and a second member using a taper implant having a threaded hole therein includes providing a taper implant having a frusto-conical outer surface, a projecting portion connected to a larger diameter end and a threaded hole passing therethrough and providing a first member having a wall portion with a tapered hole extending therethrough and having a counterbored portion adjacent a larger diameter end to receive the projection portion of the taper implant. The taper implant is inserted into the hole of the first member and held therein by frictional contact. A second member is provided having a wall portion with a hole therethrough. The second member is positioned in contact with the first member and the two members are fastened together by inserting a male screw through the hole of the second member and threading the male screw into engagement with the threaded hole of the taper implant.

Abstract: A method of fixing a taper implant to a receiving member includes providing a taper implant having a frusto-conical outer surface, a projecting portion connected to a larger diameter end and a smaller diameter end. A receiving member is provided which has a wall portion with a passing-through hole therein with at least a portion of the passing-through hole being tapered to form a frusto-conical shape whereby the taper portion has a larger diameter end and a smaller diameter end and the passing through hole has a cylindrical counterbored portion adjacent to the larger diameter end in which the projecting portion of the taper implant is received. A taper rate of the taper portion of the passing through hole is the same as a taper rate of the taper portion of the taper implant.

Abstract: A taper implant includes a taper portion having an outer surface frust-conical in shape. A flange portion is formed at an outermost end of the taper portion on the larger-diameter side to project outwardly with respect to the taper portion and having a flat surface situated perpendicularly to the axial direction of the taper portion, and female threads serving as a fit portion extending in the axial direction of the taper portion. A hole taper portion and a hole step portion are drilled at the same time to bore a hole in one of the members to be fastened, and the taper implant is driven into the hole, thereby providing a screw fastening structure for the fastened members.

Abstract: A taper implant of the invention comprises a taper portion having an outer surface being frustconical in shape, a flange portion formed at an outermost end of the taper portion on the larger-diameter side to project outward with respect to the taper portion and having a flat surface lying perpendicularly to the axial direction of the taper portion, and female threads serving as a fit portion extending in the axial direction of said taper portion. A hole taper portion and a hole step portion are drilled at the same time to bore a hole in one of members to be fastened, and the taper implant is driven into the hole, thereby providing a screw-fastening structure for the fastened members. The taper implant ensuring good working efficiency is achieved.

Abstract: A taper implant of the invention comprises a taper portion having an outer surface being frustconical in shape, a flange portion formed at an outermost end of the taper portion on the larger-diameter side to project outward with respect to the taper portion and having a flat surface lying perpendicularly to the axial direction of the taper portion, and female threads serving as a fit portion extending in the axial direction of said taper portion. A hole taper portion and a hole step portion are drilled at the same time to bore a hole in one of members to be fastened, and the taper implant is driven into the hole, thereby providing a screw-fastening structure for the fastened members. The taper implant ensuring good working efficiency is achieved.

Abstract: A taper implant of the invention comprises a taper portion having an outer surface being frustconical in shape, a flange portion formed at an outermost end of the taper portion on the larger-diameter side to project outward with respect to the taper portion and having a flat surface lying perpendicularly to the axial direction of the taper portion, and female threads serving as a fit portion extending in the axial direction of said taper portion. A hole taper portion and a hole step portion are drilled at the same time to bore a hole in one of members to be fastened, and the taper implant is driven into the hole, thereby providing a screw-fastening structure for the fastened members. The taper implant ensuring good working efficiency is achieved.

Abstract: A balance adjustment method of an end mill for increasing the accuracy of the machined surface and also for lengthening the tool lifetime, in which mass unbalance between an end gash part of a primary cutting edge and an end gash part of a secondary cutting edge of the end mill having asymmetric cutting parts is balanced by decreasing an end gash angle, an end gash part, a clearance angle or a corner of tooth face of the secondary cutting edge.