초록 ▼

A manhole extender ring system 2 comprises an annular base member 4 having a flange 24 disposed therein, an annular insert member 32 slidably disposed within the base member 4 and supported by the flange 24, an annular ring member 44 having a ring top surface 46 slidably engaging the insert member 3

A manhole extender ring system 2 comprises an annular base member 4 having a flange 24 disposed therein, an annular insert member 32 slidably disposed within the base member 4 and supported by the flange 24, an annular ring member 44 having a ring top surface 46 slidably engaging the insert member 32 and supported by the base member 4 and a cover member 62 having a cover top surface substantially flush with the ring top surface 46 slidably disposed within the ring member 44 and supported by the insert member 32. The ring member 44 is removably mounted to the base member 4 by use of a variable, elongate stabilizer bracket 70 having a J-shaped end 78 and a C-shaped end 86. The J-shaped end 78 removably engages a shoulder 60 of the ring member 44 and the C-shaped end 86 removably engages the flange 24. Pins 98 may be disposed on the insert and ring top surfaces to removably engage receiving bores disposed on the insert and ring bottom surfaces when the insert and ring members are in a multiple stacked relationship.

대표청구항 ▼

[ What is claimed is:] [1.] A manhole extender ring system, comprising:a base member having a foot for engaging a manhole foundation, a rim surface and a base wall, the base wall having a wall inner surface and a flange depending from the wall inner surface, the flange having a flange upper surface;

[ What is claimed is:] [1.] A manhole extender ring system, comprising:a base member having a foot for engaging a manhole foundation, a rim surface and a base wall, the base wall having a wall inner surface and a flange depending from the wall inner surface, the flange having a flange upper surface;a vertically adjustable insert member removably received within the base member, the insert member having an insert top surface, an insert bottom surface and an insert wall, the insert wall having an insert outer surface adapted to slidably engage the wall inner surface of the base member, and the insert bottom surface adapted to be supported by the flange upper surface;a vertically adjustable ring member removably engaging the base member and the insert member, the ring member having a ring top surface adapted to be placed so as to be substantially flush with the surface of a roadway and a ring bottom surface adapted to removably engage the rim surface;a cover member removably engaging the insert member and the ring member, the cover member having a cover top surface adapted to be substantially flush with the ring top surface, a cover bottom surface supported by the insert top surface and a cover edge surface adapted to slidably engage the ring inner surface;the insert member having at least one outer channel on the insert outer surface;the ring member having a ring inner surface and a ring outer surface, at least one inner channel on the ring inner surface adjacent to and opposite the outer channel, at least one groove on the ring top surface adjacent the inner channel and defining a shoulder within the groove located inwardly from the ring outer surface and below the ring top surface; andan elongate stabilizer bracket disposed within the outer and inner channels having a J-shaped end removably engaging the shoulder and a C-shaped end removably engaging the flange.