| 摘要 |
A hammer drill, comprising
a motor (111),
an internal mechanism (113, 117) driven by the motor (111),
a housing (103) that houses the motor and the internal mechanism,
a hammer bit (119) disposed in one end of the housing and driven by the internal mechanism in the longitudinal direction of the hammer bit to perform a predetermined operation,
a handgrip (102) connected to the other end of the housing (103), and
a dynamic vibration reducer (151) including a weight (155) and an elastic element (157), the elastic element being disposed between the weight and the housing and adapted to apply a biasing force to the weight, wherein the weight reciprocates in the longitudinal direction of the tool bit against the biasing force of the elastic element, whereby the dynamic vibration reducer reduces vibration which is caused in the housing in the longitudinal direction of the tool bit in the working operation, and wherein the dynamic vibration reducer is disposed by utilizing an internal space (201) defined by the housing (103) by utilizing a space between the housing and the internal mechanism. |
