FIELD: mining.
SUBSTANCE: group of inventions relates to mining and can be used in a downhole actuator. Downhole actuator (30) comprises tubular housing (34), which includes profile (42) of stepped movement on its inner surface and sleeve (46) of stepped movement, mounted within housing (34). Sleeve (46) of stepped movement includes a catching device comprising first and second axially spaced catching elements (52, 54), interacting with profile (42) of stepped movement of casing (34) for successive catching by control object (48), passing through central channel (50) of the sleeve (46) of stepped movement for moving sleeve (46) of stepped movement on one discrete step of movement through housing (34) towards the actuation site.
EFFECT: technical result is higher reliability of the actuator.
22 cl, 47 dwg
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