| 摘要 |
In a support for holding and positioning a utility load in space having a base (10) and an elongated supporting arm (12) which between its longitudinal ends is swingably supported on the base (10) for swinging moment about a vertical first axis (24) and about a horizontal second axis (30) which intersects the vertical first axis (24), the supporting arm (12) carrying on one side of the second axis the utility load and on the other side of the second axis carrying a counterweight compensating for the utility load, the utility load being arranged on a first connector arm (14) which is pivotally supported at one end of the supporting arm (12) for moment about a third axis (36), the counterweight (18) being arranged on a second connector arm which is swingably supported on the other end of the supporting arm (12) for movement about a fourth axis (38), the third and fourth axis being parallel to one another, the spacing (Ln) between the engagement point (N) of the utility load and the first connector arm (14) and the third axis (38) being equal to the spacing between the third axis (38) and the vertical axis (24), the spacing (Lg) measured in the longitudinal direction of the second connector arm (16) between the center of gravity (G) of the counterweight (18) and the fourth axis (38) being equal to the spacing between a fourth axis (38) and the vertical first axis (24), and the two connector arms (14, 16) being so coupled with one another by a coupling means that in any pivoted position they are directed antiparallel to one another. |
