FIELD: electricity.
SUBSTANCE: frontal unit (3) for an instrument holder (1) comprises a manual valve (5) arranged on the front panel of front unit control, pre-stressed and movable, mainly in parallel to the front panel of control for opening of a hole (9) providing access in order to set two or more positions of the instrument holder (1) connection. According to the invention, the front unit (3) comprises a handle (4) for actuation of the main switch (20) of the instrument holder (1). In the front unit (3) there is a locking device (8) for mutual blocking of the manual valve (5) and the main switch (20).
EFFECT: simplified design with preservation of safety.
15 cl, 9 dwg
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