Manufacturing manhole cover frames

Details Manufacturing manhole cover frames Manufacturing manhole cover frames

B - Operations, Transporting

28

B

25/60

B28B 7/18 (2006.01) B22C 9/22 (2006.01) E02D 29/14 (2006.01)

Patent

CA 1169235

ABSTRACT Manufacturing Manhole Cover Frames A manhole cover frame is moulded in one piece of a hardenable material such as concrete which is poured into a jig and is actually moulded against those surfaces of a manhole cover with which it is to interfit in use. When the frame is matched to the cover used to mould it, there results a perfect fit between the two. The surfaces of the cover which are to seat against the frame are machined prior to use of the cover in the moulding process, so that a closely mated interface is obtained between the cover and the frame. Alternatively. the cover surfaces are not machined but are coated with a low-frictional material.

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