Patent ID: 8522890
Filing Date: 2013-09-03
Classification: B25D

Abstract:
1. A power tool comprising: a housing defining therein a mechanism chamber, a lubricant being inserted in an interior of the mechanical chamber; an electric motor accommodated in the housing; a speed change mechanism disposed in the mechanism chamber and connected to the motor for converting a rotary motion of the motor; and a protrusion member protruding to the interior of the mechanism chamber from an exterior of the mechanism chamber, the protrusion member providing a communication passage that has one opening open at a leading end side of the protrusion member and another opening open to the exterior of the mechanical chamber, wherein the protrusion member includes a first passage forming member located on the leading end side of the protrusion member, wherein the first passage forming member is formed with a first passage open to the interior of the mechanism chamber through the one opening, the first passage being one part of the communication passage, and wherein the first passage forming member is made from a resilient material.