초록 ▼

A manhole frame assembly for supporting a member that can obstruct an access opening when the level of a construction material around the opening is raised, includes an outer frame member having a support surface and a side wall extending from the support surface. The side wall is constructed and ar

A manhole frame assembly for supporting a member that can obstruct an access opening when the level of a construction material around the opening is raised, includes an outer frame member having a support surface and a side wall extending from the support surface. The side wall is constructed and arranged with an upper surface that is substantially flush with an original level of the construction material. An inner frame member can be received on the support surface and includes a surface for supporting a member for obstructing the access opening. The side wall includes an abutment device for preventing upward movement of the inner frame member when the original level of construction material around the outer frame member is raised. A portion of the inner frame member is movable in a direction transverse to a direction of a length of the access opening. Other features of the invention are directed to a method of fastening the inner frame to the outer frame and an apparatus for fastening the obstructing member to a manhole frame structure.

대표청구항 ▼

[ What is claimed is:] [1.] A manhole frame assembly for supporting a member that can obstruct an access opening when an upper surface of construction material around the opening is raised, said manhole frame assembly comprising:an outer frame member disposed around the access opening having a suppo

[ What is claimed is:] [1.] A manhole frame assembly for supporting a member that can obstruct an access opening when an upper surface of construction material around the opening is raised, said manhole frame assembly comprising:an outer frame member disposed around the access opening having a support surface and a side wall extending from said support surface, said side wall being constructed and arranged with an upper surface that is substantially flush with an original level of the construction material;an inner frame member that can be supported on said support surface, said inner frame member comprising a surface for supporting the member for obstructing the access opening;said side wall comprising abutment means for preventing upward movement of said inner frame member when the original level of construction material around said outer frame member is raised, wherein a portion of said inner frame member is movable in a direction transverse to a direction of a length of the access opening.