| 摘要 |
The present application finds application in the technical field of the devices for hoisting and transporting loads and relates to a balanced actuator device for lifting and transporting apparatus comprises a bearing frame ( 3 ), means ( 4 ) for supporting an external load (L), substantially vertical guide means ( 5 ) associated with said frame ( 3 ) to guide said support means ( 4 ), drive means ( 6 ) operating on said support means ( 4 ) to move them along said guide means ( 5 ) by a predetermined stroke (c) between a lower end position (A) and a upper end position (B). The drive means ( 6 ) include at least one preloaded elastic actuator element ( 7 ) which is designed to exert a sufficient balancing force (F) on said support means ( 4 ) to hold the load (L) in an intermediate equilibrium position (C) between the upper (B) and lower (A) end positions thereby allowing minimization of the size of the drive means ( 6 ).
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