| 摘要 |
A hammer is provided which enables the orientation of a tool or bit mounted within a spindle of the hammer to be rotated to the required orientation. The hammer comprises a housing part having an aperture therein in which a spindle that is mounted so that the spindle extends out of the housing through the aperture. The spindle is capable of being rotated about its axis to any of a plurality of orientations, so as to alter the orientation of a tool or bit mounted therein. A locking ring is located around the spindle which locking ring can be moved axially along the spindle into and out of engagement with the housing part, so that when the locking ring engages the housing, it prevents the spindle from rotating with respect to the housing. A grip ring is located around the spindle and can be rotated about the axis of the spindle from a first position in which it prevents disengagement of the locking ring from the housing. When the grip ring is rotated about the axis of the spindle to a second position, the locking ring is disengaged from the housing, thereby to allow the spindle to rotate with respect to the housing to a different orientation.
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