Manhole

Details Manhole Manhole

1982-03-11

1985-02-19

Friedman, Carl D.

Static structures (e.g., buildings)

With entrance for persons or objects in horizontal or...

404 25, E02D 2914

Patent

active

044996950

ABSTRACT:
A manhole cover plug (1A) contains three helical ribs (5A) whose profile, in transverse cross-section, has two lateral quarter-circular parts (11A, 12A). These lateral parts cooperate with helical grooves of the frame with a quarter-circular profile of a greater radius.

REFERENCES:
patent: 4015373 (1977-04-01), Boissier

Affiliated with

Also associated with

Rating

Manhole does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Manhole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manhole will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-606161