Adjustable manhole frame and method of construction and installation
OwnerEverett J. Prescottinventor
Life of this patent
Estimating the term…
Abstract
An adjustable cast iron or ductile iron manhole frame and method of construction utilizing a formed concrete base or a base of brick and cement mortar that supports both the frame and the pavement. The height and angle of the frame are determined by the method of construction which sets the height and angle of the formed concrete base. The frame is further adapted to receive and hold the manhole cover, and the frame includes an arched section to hold it securely to the concrete base or to filler material when in a raised position.
Claims19
A frame disposable in surmounting relation to a manhole cone to define a manhole opening at pavement level, the opening being closable by a manhole cover, the frame further being capable of adjustment relative to the cone and to the pavement level, comprising:
- a body member having a centrally disposed opening defined at least in part by an inner skirt portion which extends substantially about the periphery of the opening, the body member having a planar upper surface normally disposed horizontally when installed relative to the cone, that portion of the planar upper surface proximate to and surmounting the inner skirt portion being recessed into the body member about the perimeter of the opening to define a peripheral seat for receiving and supporting the edges of the manhole cover, the body member further having an outer skirt portion spaced from the inner skirt portion and extending downwardly from the planar upper surface and substantially about the outer perimeter of the body member, at least a portion of the lower surface of the body member between the inner and outer skirt portions being arcuate and defining an arch-like channel disposed between at least portions of the inner and outer skirt portions, innermost surfaces of the channel having a slope which is angled relative to a line taken perpendicularly to the planar upper surface of the body member to facilitate installation and adjustment of the height of the frame relative to the manhole cone.
A method for installing a frame in surmounting relation to a manhole cone to define a manhole opening at pavement level, comprising the steps of:
- disposing a form in the opening of the manhole cover;
- suspending the frame in place relative to and substantially about the outer perimeter of the form in spaced relation to the form;
- adjusting outer contours of the form to expand the form to contact the form with the frame and thus support the frame in place in surmounting relation to the cone;
- filling in spaces between upper portions of the cone and lower portions of the frame to support the frame relative to the cone;
- and,
- removing the form.
Apparatus for installing a frame in surmounting relation to a manhole cone having an opening, comprising:
- a form disposed within the opening of the manhole cone;
- means carried by the form for varying the effective size of the form;
- and,
- height adjustment means supported by the form for supporting the frame and for varying the height of at least portions of the frame relative to the cone, the form being expanded by the first-mentioned means on adjustment of the height of the frame relative to the cone to engage the form with the frame and support said frame, the height adjustment means thereby being replaced as the means for supporting the frame.
Dependencies are inferred from the claim text.