“Hydraulic Cushion” Type Overload Protection Devices Usable in Mechanical Presses. A Patent Study

Mechanical Crank Presses with a Modified Law of Motion of the Slide. A Patent Study

“…Outstanding is also the presence of two wedge mechanisms for two adjustments: adjustment in the vertical plane of the axis of joint 9 (joint D of Figure 14a), the translation of the wedge in the horizontal plane being achieved by a screw-nut mechanism, and the adjustment of the position of slide 1, the position of wedge 2 in the horizontal plane being ensured by hydraulic piston 15. Piston 15 can also have the role of "hydraulic cushion" protection system against force overload [14].…”

“…Patent DE 19913710 [17] provides the possibility of translating joint O7 in the horizontal plane perpendicular to the direction of motion of the slide, by means of either an eccentric mechanism, Figure 20a, or a hydraulic piston, Figure 20b. In this latter case piston 52 can also or only play the role of a "hydraulic cushion" type protection system against force overload [14]. a) b) Fig.…”

Influence of Hydraulic Domain on Vibration Control and Overload Prediction of High‐Speed Punching Press: Multidomain Modelling and Experiment

“…In this paper, the function of the relief valve of the hydraulic system is to make the pressure of the rodless chamber of the hydraulic cylinder remain constant. Under the overload loading, the relief valve unloads, part of the high-pressure liquid in rodless chamber flows back to the tank; therefore, the piston rod returns back a certain distance, so as to ensure the die would not be destroyed by the overload loading [16].…”