(under subclass 147) Device including structure for moving the tool radially, structure for locking the tool in an extended (i.e., operatable) position and, including provision to release the locking means in response to the occurrence of an anticipated condition.
(1) Note. In most of the patents herein the tool or the tool-moving means is resiliently biased against the locking device by a spring adapted to move the tool out of operative position upon movement of the device.
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4, for locking structure similar to that found herein, but for interlocking one machine member and then releasing that member in response to the position of another machine element.
5+, for means for sensing condition and provision to terminate operation of a machine in response thereto.
