Manhole cover riser assembly
AssigneeAmerican Highway Products, Ltd.
InventorRaymond Fier
Life of this patent
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Abstract
A riser assembly for supporting a manhole cover is placed within a manhole frame for raising the height of the manhole cover to pavement level. The riser assembly includes a circular frame formed of a metal bar and has a locking ring attached thereto which extends vertically downwardly from the frame. A plurality of outwardly projecting tabs are formed in the locking ring and are adapted to engage the manhole frame to prevent upward movement of the riser. An expansion device expands the frame and locking ring outwardly whereby the locking ring abuttingly engages a vertical surface of the manhole frame to assist in locking the riser assembly to the manhole frame.
Claims19
A manhole assembly including:
- a manhole frame adapted to be located below a pavement surface, said frame having an inner conical surface and an annular horizontal surface extending inwardly from said conical surface and terminating in an annular generally vertical surface;
- a riser assembly including an annular riser frame having a lower surface for supporting the riser frame on the horizontal surface of the manhole frame, and an annular locking ring extending downwardly from the riser frame and along the vertical surface of the manhole frame;
- and
- said riser frame and locking ring being expandable outwardly to force the locking ring into abutting engagement with the vertical surface of the manhole frame to secure said riser assembly within the manhole frame.
The manhole assembly defined in claim 15 wherein a conical flange extends upwardly from the riser frame to form a seat for a manhole cover.
The manhole assembly defined in claim 15 wherein the riser frame and locking ring are formed with aligned gaps;
- and in which an expansion device is located within the gap of the riser frame for expanding the locking ring into abutting engagement with the vertical surface of the manhole frame.
The manhole assembly defined in claim 15 wherein the riser frame has a generally rectangular cross-sectional configuration;
- and the locking ring is an elongated thinner member than said riser frame.
A riser assembly for supporting a cover in an elevated position within an opening of a frame located below a surface, said riser assembly comprising an annular bar having a generally horizontally extending surface for supporting the cover thereon, and a one piece locking ring extending downwardly from the bar, said locking ring being formed with a plurality of projections formed integrally with and extending outwardly from said ring for engagement with the frame to retard upward movement of the bar and locking ring within the frame.
A manhole assembly including:
- a manhole frame having a downwardly extending inner conical surface and an annular horizontal surface extending inwardly from said conical surface and terminating in a generally annular vertical surface;
- a riser assembly including an annular riser frame having a lower surface for supporting the riser frame on the horizontal surface of the manhole frame and an annular metallic locking ring extending downwardly from the riser frame and along the vertical surface of the manhole frame;
- and
- said locking ring includes a plurality of locking projections formed integrally therewith to form a one-piece member with said locking projections protecting upwardly outwardly at an acute angle from said ring and having an upper end extending inwardly toward the ring and engageable with the manhole frame when placed thereon to restrict upward movement of the riser frame.
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Dependencies are inferred from the claim text.