Nec Corporation

Nobuyuki Yanagi

Hiroshi Ueda

Akira Sakai

Taneaki Chiba

Akiyo Iizuka

Masato Yamauchi

A screwdriver has a plurality of driver pins or different kinds where the shapes of the point portions are different from one another, and connecting shafts connected to the driver pins through universal joints, respectively. The driver pins are provided with spline grooves. Actuating shafts are also connected to the connecting shafts through universal joints, respectively. These members are housed within a cover and are guided upward and downward through the interior walls of the cover. The respective actuating shafts are upwardly energized by springs. Only one of the second shafts is selected and pushed down against the energizing means by a solid cam. The cover is provided with a single hole at a bottom end of the cover, and the single hole allows only one of the driver pins to pass through. The surfaces of the single hole are provided with a spline which is engageable with the longitudinal spline grooves of each of the driver pins.

Screwdriver having plural kinds of driver pins

Cooling air compulsorily introduced from an air inflow hole 18 into a duct 10 by means of a fan 5 is compressed within the duct 10 and enters a duct 13 from an air outflow hole 11 through an air inflow hole 12 to be injected into a package 23 from an air outflow hole 14 through an air inflow hole 15. Subsequently, it flows along both surfaces of a printed circuit board 21, during which it exchanges heat with the heat evolving portion of the printed circuit board 21 to flow out from an air outflow hole 16 into the container body 1. From the interior of a container body 1, air flows out through an air outflow hole 17 to the exterior. The printed circuit board 21 can be cooled efficiently with a small air flow rate and an excellent performance of electromagnetic shielding can be achieved.

Case for shielding electronic circuit members from electromagnetic waves

Control unit for an electronic computer

Growing community of inventors

Tokyo, Japan

Nobuyuki Yanagi