(under subclass 58) Device wherein the impulse or signal which brings about or initiates the stoppage is entirely a product of the will of an operative.
(1) Note. This subclass excludes means for halting a machine part solely by the application of braking force, or the interposition of blocking means, in a yieldable drive train. Examples of such excluded subject matter may be found in the patents of subclass 593.
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57, for manually actuated device which disturbs cyclic operation, rather than starts of stop a cyclic cutting operation.
571, for disconnecting means between tool and tool actuator, as for changing a machine set-up, and subclasses 572+, indented thereunder, for means capable of connecting or
disconnecting a tool, or tool and its support, to or from an actuating element while the latter is in motion (i.e., "gag" or "gag block"), and see (4) Note under subclass 58, above.
