Power tool and compact power feed trimmer head

An accessory mounting device for a power tool is disclosed wherein a reference axis forms an axis of rotation of the accessory mounting device, the accessory mounting device comprising: a housing forming an interior volume, the housing comprising a ramped surface in the interior volume at which a bearing is positioned; a first plate forming a channel at which the bearing is positioned at the ramped surface to urge the first plate along the reference axis; and a second plate configured to urge the spool in a direction of the reference axis, where the bearing is configured to selectively urge the first plate to the second plate when a centrifugal force threshold is exceeded, and where the second plate is allowed to rotate about the reference axis when separated from the first plate. 披露了一种用于动力工具的附件安装装置，其中，参考轴线形成该附件安装装置的旋转轴线，该附件安装装置包括：形成内部容积的壳体，该壳体包括在该内部容积中的成斜坡表面，轴承定位在该成斜坡表面处；第一板，该第一板形成通道，在该通道处，该轴承定位在该成斜坡表面处，以沿着该参考轴线推动该第一板；以及第二板，该第二板被配置成沿着该参考轴线的方向推动线轴，其中，该轴承被配置成当超过离心力阈值时选择性地将该第一板推动到该第二板，并且其中，该第二板在与该第一板分开时被允许围绕该参考