| 摘要 |
590938 An adjustable support for an access hatch frame or manhole frame. The support has an annular lower frame member with at least one upper interface surface and an annular upper frame member with at least one lower interface surface. The support has a number of height adjustable mounting points. The plane defined by the interface of the upper interface surface and the lower interface surface is not parallel to a plane defined by a lower surface of the lower frame member or a upper surface of the upper frame member. The lower interface surface and the upper interface surface are bevelled to aid location and engagement between the upper and lower frame members. Rotation of the upper frame member relative to the lower frame member about the planar interface varies the relative angle between the plane defined by the lower surface of the lower frame member and the plane defined by the upper surface of the upper frame member. A third frame member is mounted to the upper surface of the upper frame member via the height adjustable mount points.
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