ACTUATOR

• Main Author: CARLSSON, Ingemar
• Format: Patent
• Language: English; French; German
• Published: 19.08.2015
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; ENGINEERING ELEMENTS AND UNITS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; THERMAL INSULATION IN GENERAL; WEAPONS

An actuator ( 1) for the lifting of loads, especially within the theatre and event business or within sporting events, comprising a hydraulic cylinder (2) with a cylinder body (3), a slidable piston inside the cylinder body, as well as a pressure accumulator (5) arranged to deliver a controllable hydraulic pressure to the hydraulic cylinder (2) to influence the piston inside the cylinder body (3). The actuator comprises a screw mechanism with a screw and a nut arranged to interact with the piston and thereby control the position of the piston inside the cylinder body (3). The screw mechanism has a static non-self-locking construction that comprises a roller or ball screw. The actuator (1) comprises an electric motor (8) or a hydraulic motor both for driving the screw and the piston interacting with the screw when lifting the load and for positioning the screw and the piston interacting with the screw in case of a loss of hydraulic pressure from the pressure accumulator (5) during ongoing lifting of the load.