HYDRAULIC PRESSING DEVICE Russian patent published in 2014 - IPC B25F5/00 B25B27/00 

FIELD: machine building.

SUBSTANCE: device includes a movable element that is moved by means of a hydraulic piston of a hydraulic cylinder relative to a fixed element. Return of the hydraulic piston to initial position is performed with a return spring. Return motion occurs depending on the pre-determined pressure as a result of actuation of a check valve. Besides, a control valve is provided, which in addition to the check valve, when in an open state, opens a drain of the hydraulic device and has an ingress side and a drain side. In accordance with one version of design, the control valve is loaded with pressure of a back flowing hydraulic agent on the ingress and the drain side at opening of the check valve. Besides, pressure on the ingress side is lower as a result of throttling. As per the second version of design, the device includes a hydraulic pump, from which a hydraulic agent flow passes to the control valve and directly to the check valve.

EFFECT: possible control of hydraulic piston movement depending on certain pressing conditions.

10 cl, 6 dwg