Abstract: A radio controlled, battery-operated model toy having an electric motor, a battery device for supplying energy to the electric motor, a radio control receiver, and a servo mechanism operated by the output of the receiver, wherein a voltage responsive automatic circuit breaker which opens the electric circuit of the electric motor in response to a voltage drop in the battery device and holds the circuit in the open stage is provided between the battery device and the electric motor, and a voltage regulator/noise filter is provided between the battery device and the radio control receiver.

Abstract: An electric sharpener is disclosed, wherein its sharpener section is driven by a motor powered from a self-contained battery in an arrangement that said motor and a reduction means for transmitting the revolving force of said motor to said sharpener section are housed in an inner case movable relative to an outer case in the lengthwise direction and the electrical connection between said self-contained battery and said motor is controlled by moving said inner case in said lengthwise direction with a pencil inserted into said sharpener section.

Abstract: A cooling device suitable for a miniature motor is disclosed which uses a combined fan and gear comprising a gear portion integrally formed with a fan portion in order to make the motor shaft as short as possible to minimize the vibration of the shaft.

Abstract: A cell adapter is disclosed which comprises a hollow cylindrical body having an interior space for the insertion of a cell thereinto and having an exterior diametral size agreeing with the size of the cell receiving space of a cell powered electric appliance in which the cell is to be placed. The hollow cylindrical body can be formed as an monoblock molding unit, that is integral unit, and has resilient holding portions at its top for elastically holding the cell inserted into said interior space.

Abstract: A disclosure is made of an electric motor assembly in which a motor casing containing a motor and a battery casing housing one or more batteries are coupled in a manner so that a motor energizing circuit is turned on or off by relative rotational displacement between said two casings and the motor is fixed within said motor case by means of a terminal or contact strip. Further disclosed are raised ridges or grooves provided on said battery casing as means of supporting the whole assembly of said electric driving device, a method of immovably fixing said battery casing where said motor casing is made free for rotational displacement, a method of facilitating rotational displacement of said battery casing where said motor casing is immovably fixed, and also a switching mechanism.

Abstract: An electric motor casing is formed with a T-shaped groove. A mounting member comprises a first flange portion to fit in the T-shaped groove of the motor casing and second and third flange portions parallel to the first flange portion for attachment to a model airplane or the like. A beam portion connects the first, second and third flange portions. The second and third flange portions are disposed on the opposite sides respectively of the first flange portion along the longitudinal axis of the mounting member. A wall portion is perpendicular to and connects the first and second flange portions. The end of the beam portion connected to the third flange portion is enlarged to spread the sides of the T-shaped groove during mounting of the motor casing.

Abstract: A portable charger, together with its accessory devices, is disclosed which has incorporated a circuit such that when the cell to be charged is mounted thereon, a discharge circuit will be closed to clear the residual charge in the cell to be charged and then, by pressing a push button manually, the cell will be charged.

Abstract: A battery cassette with a longitudinal separator positioned between two rows of battery cells, supply terminal sockets mounted in spaces between the connected cells and end plates at the terminal faces of the cassette, all these elements being enveloped in a thermo-contractive synthetic resinous film.

Abstract: There is described a charger and related devices, the charger being capable of charging batteries uniformly to a predetermined level by adjusting the residual electric amounts in the respective batteries to a uniform level prior to the charging operation, thereby avoiding overcharging of a particular battery or batteries. The charger ensures that a number of batteries be charged in a uniform electric amount or up to a predetermined level to preclude inverse charging of an undercharged battery or batteries which occurs when a number of differently charged batteries are used in series.

Abstract: An electric hand tool is disclosed which uses nickel-cadmium type cells to energize a small motor driving the tool. The speed of the motor is reduced by means of an epicyclic gear, requiring no increase in the diameter of the hand tool.