Adjustable dry pendant drop nipple assembly for sprinkler heads

B - Operations – Transporting – 05 – B

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B05B 15/08 (2006.01) A62C 37/10 (2006.01)

Patent

CA 1050388

Abstract An adjustable drop nipple is disclosed for installing fire protection sprinkler systems which comprise sprinkler head assemblies of the pendant, dry drop variety. The down- wardly extending length of a drop nipple having a sprinkler head thereon is adjusted to achieve a desired length by means of a threaded connection between the nipple and a collar that interconnects the nipple with a supply line for a fire extinguishing fluid such as water. Accordingly, the drop length of the nipple is adjusted by screwing it into or out of the collar. Leakage of fluid between the walls of the collar and the nipple is prevented by use of one or more O-ring seals. Advantages provided by the present drop nipple assembly include the ability to adjust the drop length from below the ceiling line, pressure testing of the system prior to installation of the ceiling, and adjustment of the drop length subsequent to pressure testing, after in- stallation of the ceiling, and under pressure. In another embodiment the downwardly extending length of a drop nipple having a sprinkler head thereon is adjusted by sliding the nipple axially in a collet having an externally tapered section that engages an intermally tapered section of a stationary collet holder. When a selected drop length has been established, the collet is compressed axially against the collet holder with tightening means whereby the nipple is firmly gripped by the collet so that axial sliding thereof is prevented, thereby maintaining the nipple at the selected drop length.

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