Patent ID: 6597572
Filing Date: 2003-07-22
Classification: B25F,H02J

Abstract:
A DC power source unit used as a power source of a power tool, comprising:a housing formed with an air inlet portion, an air outlet portion, and a battery pack insertion hole; means for defining a battery pack accommodating space for accommodating a battery pack inserted into the battery pack insertion hole, the inner space of the housing being divided into the battery pack accommodating space and a main space; a substrate; circuit components mounted on the substrate, disposed in the main space, and mutually connected together to generate charging power to be supplied to the battery pack and DC power to be supplied via an adapter to the power tool for driving, the battery pack being used as an alternative power source of the power tool and charged by the charging power when inserted into the battery pack insertion hole and accommodated in the battery pack insertion space; air flow generating means, disposed in the main space, for generating air flow to cool down the circuit components; and air flow maintaining means for maintaining the air flow at substantially constant regardless of whether or not the battery pack is accommodated in the battery pack accommodating space.