초록 ▼

A manhole cover and frame assembly includes an outer frame having a support surface and a side wall that extends upward from the support surface and has a recessed portion. An inner frame is supportable on the support surface. The inner frame has a protrusion extending from the outer peripheral surf

A manhole cover and frame assembly includes an outer frame having a support surface and a side wall that extends upward from the support surface and has a recessed portion. An inner frame is supportable on the support surface. The inner frame has a protrusion extending from the outer peripheral surface. The inner frame also includes an adjustable joint for adjusting the inner frame in its peripheral dimensions to expand to engage the protrusion with the recessed portion, thereby preventing upward movement of the inner frame, and to contract to remove the protrusion from the recessed portion. The inner frame also includes a cover support surface. A manhole cover is supportable on the cover support surface.

대표청구항 ▼

A manhole frame assembly comprising an outer frame member and an inner frame member that can be received by said outer frame member, said outer frame member having a support surface and a side wall that extends upwardly from the support surface, said side wall having a recessed portion that is at le

A manhole frame assembly comprising an outer frame member and an inner frame member that can be received by said outer frame member, said outer frame member having a support surface and a side wall that extends upwardly from the support surface, said side wall having a recessed portion that is at least partially defined by an abutment surface that prevents upward movement of said inner frame member, said inner frame member being supportable on said support surface and including (a) at least one protrusion extending from an outer peripheral surface of said inner frame member, (b) at least one adjustable joint adapted to adjust said inner frame member in its peripheral dimensions to expand to move said protrusion into said recessed portion, whereby said protrusion contacts said abutment surface to prevent upward movement of said inner frame member, and to contract to remove said protrusion from said recessed portion, and (c) a cover support surface for supporting a manhole cover.