| 摘要 |
There is provided a disappearing sprinkler device connectable to a water supply line. The sprinkler device comprises a housing (2) of an elongated cross-section open at its top, and a pair of telescoping, tubular members (8,10). The first member (8) is stationary and the second member (10) is upwardly extendable by application of water pressure and downwardly retractable when the water pressure is reduced to below a given threshold. The housing is provided with a cover plate (18) which is fixedly attached to the sprinkler (16). The device also comprises a cam-like member (26) co-acting with guide means (22) to such effect that when the water pressure is reduced to below a given threshold the upwardly extended second member carrying the sprinkler is retracted. The rotary sprinkler, prior to its complete re-entry into the housing and regardless of its angular position at the instant the water pressure was reduced, is automatically oriented to assume an angular position of alignment with the elongated cross-section of the housing so that, upon further retraction, it will freely enter the housing. |
