Patent ID: 7090032
Filing Date: 2006-08-15
Classification: B25B

Abstract:
1. An electric power tool comprising: a housing in which a motor having a drive shaft is disposed, said housing being composed of a pair of half portions that are to be assembled into a united body; an inner case for receiving a planetary gear train having an input side and an output shaft, said input side of the planetary gear train being connected to the drive shaft of the motor to transmit power of the motor to the output shaft at reduced speed, said inner case being received in the housing; and a hammer case for receiving a hammer unit having an input side and an output shaft, said input side of the hammer unit being connected to the output shaft of the planetary gear train to convert rotational motion of the output shaft of the planetary gear train into an intermittent striking power outputted from the output shaft of the hammer unit, said inner case being received in said hammer case, wherein: said inner case has on an outer peripheral surface thereof at least one recess; said hammer case has at least one elongated hole that is aligned with said at least one recess of the inner case; and each of said half portions has bosses through which fastening members pass to fasten the half portions into said united body, at least one of said bosses being engageable with said at least one elongated hole of the hammer case, which is aligned with said at least one recess of the inner case.