Abstract: A brush system for an electric motor is adapted to electrically connect a commutator with at least one field terminal of the motor. The system is provided in a housing of the motor and is accessible via an opening in the housing. In this system, at least one electrically conductive brush is held in contact with the commutator by an electrically conductive brush box, which has an electrically conductive connecting tab depending therefrom. The connecting tab is adapted to be connected to the field terminal. Also included is a frame which is configured and adapted to fixedly receive the brush box. A through hole is provided on the frame for allowing the connector tab to extend through the frame and connect to the field terminal. Further, an access door is configured and adapted to be latched to the opening in the housing by a latch device attached to the access door.

Abstract: A controller controls the running speed of a variable speed motor of the type which runs at a speed related to the duty cycle of a pulse width modulated drive voltage applied to it and to the load being applied. The controller includes a setting switch for setting the motor running speed and a device for measuring the load being applied to the motor. Also included is a data storage for storing data representing a plurality of different pulse width modulation duty cycles for driving the motor at various desired motor running speeds and with various loads being applied to the motor. A processor is operatively connected to the setting switch, the load measuring device and the data storage for generating signals representing a particular duty cycle corresponding to a desired running speed setting and applied load to result in the desired motor speed. The processor generates these signals at a predetermined time interval to reach and maintain the desired motor speed.

Abstract: An assembly of fasteners for use in a power fastener driving tool includes a number of fasteners having elongated shanks held in spaced apart relation by a pair of strips of frangible plastic material. Each strip includes a series of sleeves holding shanks of the fasteners and a series of spacer segments integrally joining the sleeves. The strip closer to the fastener heads is weaker than the strip closer to the fastener points. As an end fastener is driven from the assembly, the sleeve of the weaker strip associated with the next fastener to be driven is permitted to fracture, while the sleeve of the stronger strip remains intact.