Frangible coupling for barrel sections of a fire hydrant

Details Frangible coupling for barrel sections of a fire hydrant Frangible coupling for barrel sections of a fire hydrant

1986-06-03

1988-01-05

Arola, Dave W.

Pipe joints or couplings

Frangible element

Score line or groove

403 2, F16L 3500

Patent

active

047171782

ABSTRACT:
A flangible ring, for securing together the adjacent flanged ends of the upper and lower barrel sections of a fire hydrant, has two weakening grooves therein instead of the usual one. One of the grooves is conventional and located in one face of the ring just inside the circular array of bolt holes in the ring. The other weakening groove is formed in the other face of the ring and is of greater mean diameter but of smaller, width and depth than the first groove. Preferably the sides of the other groove are straight in radial section, disposed at an angle of the order of 60.degree. to the face of the ring and an extension of the inner side thereof intersects the intersection of the bottom of the larger groove with a side thereof.

REFERENCES:
patent: 1684572 (1928-09-01), Boosey
patent: 2017600 (1935-10-01), Lofton
patent: 2020365 (1935-11-01), Lofton
patent: 3331397 (1967-07-01), Mueller et al.
patent: 3738390 (1973-06-01), Luckenbill

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