Joint for connecting sprinklers to underground water pipes

Details Joint for connecting sprinklers to underground water pipes Joint for connecting sprinklers to underground water pipes

1991-07-03

1992-08-25

Arola, Dave W.

Pipe joints or couplings

Frangible element

Score line or groove

285177, 285298, 239203, F16L 3500

Patent

active

051412551

ABSTRACT:
Disclosed is a joint for connecting sprinklers to underground water pipes which is used to raise the head of sprinklers above the lawn by its double shelled inner and outer pipes engaged with each other by their male and female threads depending on the rise of the ground surface by supplying rich soil to the lawn, improved by providing a non-threaded portion to the end of female thread on the inside of an outer pipe so that male thread on the outside of an inner pipe can disengage from the female thread when the joint is lengthened up to its maximum length and/or improved by providing a plurality of stepped male threads to the end of the inner pipe with the smallest diametered one at the top and the largest diametered one at the base and providing an annular groove to the foot of each thread.

REFERENCES:
patent: 1123746 (1915-01-01), Howard
patent: 1142225 (1915-06-01), August
patent: 1492520 (1924-04-01), Meyer
patent: 2989323 (1961-06-01), Bass
patent: 3083914 (1963-04-01), Smith et al.
patent: 4099670 (1978-07-01), Cole et al.
patent: 4173989 (1979-11-01), Prest

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