FIELD: mining; protection of working tools and working member, on the whole, in mining beds of composite structures with possible loads of wide range in magnitude. SUBSTANCE: device has pump of variable capacity with control mechanism and distributor of working fluid supply. Mechanism controlling pump capacity is made in the form of hydraulic cylinder with spring in rod end and head end being communicated with pressure line. Rod of hydraulic cylinder is hinged with lever acting on washer which controls pump capacity. EFFECT: improved design. 1 dwg
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