| 摘要 |
PROBLEM TO BE SOLVED: To provide technology further contributing to rationalization in regulating the internal pressure of a storing space for storing a driving mechanism in a work tool. SOLUTION: This work tool 101 includes: a work tool body 103; a tip tool 119; driving mechanisms 113, 114, 115 for driving the tip tool; a closed driving mechanism storing space 107a in which a lubricant is filled; a pressure regulating chamber 171 communicated only with the inside of the storing space 107a; and a pressure regulating chamber constituting wall member 173 forming the pressure regulating chamber and facing on the outside of the storing chamber. The pressure regulating chamber constituting wall member 173 moves toward the outside of the storing space with an increase in internal pressure of the storing space to increase the volume of the pressure regulating chamber, whereby the increase in internal pressure of the storing space is restrained. COPYRIGHT: (C)2007,JPO&INPIT
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