(under subclass 420) Subject matter comprising terminating or tending to terminate the operation in response to a predetermined position of a tool.
(1) Note. This subclass is not intended to include, for original placement, a patent claiming an operation wherein a cam surface (on or linked to a tool) directly causes movement of a clutch element to disengage a tool from its drive. Such a patent lacks the teaching of an initiating means and will be placed on the basis of the woodworking structure and found in this subclass (427) only as a cross-reference.
