| 摘要 |
A control switch proximate a support handle of a power driven machine provides for emergency deenergization of the machine without releasing the operator's grip on the support handle. The apparatus of this invention includes a control member (60) which moves from an at rest position along a selected direction (78) and against a first biasing force (70), (36) by motion of the operator's finger and further to an emergency off position by further motion of the operator's finger. A first biasing force (36), (70) continually urges the control member (60) to the at rest position. An activating means such as sliding contact switch (54), (56) and (66) is responsive to movement of the control member (60), and is connected to the driving source of the machine such that the driving source is in a nonoperating condition when the control member is in the at rest position and is in operating condition when the control member is moved to the energizing position. A second biasing force (84), (40) is provided which is stronger or in addition to and requires more force than the first biasing force to resist further motion. A deactivating means such as a normally closed emergency off switch (58) is responsive to further movement of the control member (60) to the emergency off position and will deenergize the machine such that a panic tightening of the operator's grip results in the machine being brought to a stop.
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