Abstract: A key switch apparatus includes a key top, a dome switch and an elastic member. The key top includes a pressing surface whose vertical and lateral lengths are different. The form of the dome switch changes with the key top being pressed. The elastic member is placed around the dome switch and adds a repulsive force against the pressing force by the key top. In addition, in the elastic member, at least a part of the two ends of the longitudinal direction of the pressing surface is missing, in the whole circumference around the dome switch.

Abstract: A power tool comprises an outer casing, a drive motor disposed in the casing for driving a tool member, a drive shaft extending from the drive motor, an electric element of operating the drive motor, a heat radiating block secured to the drive motor, a power control element secured to the heat radiating block for controlling a rotation number of the drive motor, and a mechanism for preventing a rotation of the drive motor in engagement of the heat radiating block with the outer casing. The rotation preventing mechanism comprises an engaging member integrally formed to the heat radiating block and a member formed to the casing to be engageable with the engaging member. The power tool further comprises a speed reduction mechanism connected to the drive motor for reducing the driving speed of the drive motor and a rotation transmitting mechanism operatively connected to the speed reduction mechanism for transmitting the rotation of the drive motor to the tool member.

Abstract: A power tool has a speed reduction gear mechanism including a plurality of stages of planetary gear arrangements, a slide gear member disposed in a tool body to be axially movable therein to change revolution speed of the speed reduction mechanism, and a movable member operatively connected to the slide gear member for moving the same, the movable member having a ring shape and being disposed on an outer side of the slide gear member whereby the slide gear member can be smoothly moved.

Abstract: A torque adjustment device is disclosed which enhances durability and in which it is easy to set a maximum torque and to perform fine adjustment while normally keeping constant a rotational force of a torque adjustment sleeve. A cylindrical clutch adjustment handle is rotatably mounted at an opening portion of a housing. A clutch case is received within the clutch adjustment handle. A plurality of slant surfaces which are different in height in the axial direction are formed in an inner circumferential portion of the clutch adjustment handle. A clutch plate is supported to the slant surfaces. Also, the clutch plate is displaceably mounted along an outer peripheral portion of the clutch case. Steel balls which are held by a clutch surface of an inwardly toothed gear are received in holes of the clutch case. A spring is interposed between an abutment plate in abutment with the steel balls and the clutch plate. A plurality of recesses are formed in a flanged portion of the clutch adjustment handle.

Abstract: A method of producing a brassinosteroid is disclosed, wherein crown gall cells capable of producing the brassinosteroid are cultured in a culture medium in the presence of a cultivation aid selected from auxins, sterols, squalene, casamino acid and mixtures thereof.