| 摘要 |
In order to block a moving device while a hazard lasts and in order to prevent a hazardous supply of energy while movement of said device is enabled, using mechanically operated electrical switching means and a locking mechanism which is combined with the said switching means and whose blocking mechanism (as a receiver) is operated by an operating element, as a transmitter, as a function of the switched-on or switched-off state of the hazard source, a three-stage (three-step) switch being used as the switching means and being mechanically rigidly connected to an operating mechanism which can be pressed, against the pressure of a restoring spring (19), from a first switching stage (position I) into a second switching stage (position II) by manual operation, and into a third switching stage (position III) only by a solenoid (stepping magnet) (3). The operating mechanism mechanically locks the protection arrangement in the first two positions, and releases it in the third position. The three-stage switch interrupts the hazard source in the first position and drives the solenoid (3) in the second position, said solenoid (3) being energised (in the event of switching-off being confirmed) by a signalling switch (29) which is closed by the hazard source, and drawing the operating mechanism into the third position in which the connection circuit of the hazard source is interrupted and the operating mechanism is blocked for the release duration of the protection arrangement. <IMAGE>
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