| 摘要 |
<p>A switching device operable between different set-pointscomprising a rotary control handle adapted to switch between set-points, a sliding element adapted for protraction from a restingposition to an elevated position to lock the control handle at anyset-point and retraction from the elevated position to the restingposition to unlock the control handle, a locking member comprisinga shaft and a recess, said shaft is movable in response to theprotraction and retraction of the sliding element and respectivelyinto and out the recess so as to correspondingly lock and unlockthe control handle, and means for selectively disabling theprotraction of the sliding element at a designated set-point in anormal course of operation and selectively enabling theprotraction when required.Figure 4c</p> |
