초록 ▼

A pop-up rotary sprinkler with adjustable arc limits has a memory arc mechanism separate from its arc adjustment and head reversing mechanisms for automatically returning the head to oscillation between its pre-set sector limits should its head be twisted or held against normal rotation by a vandal.

A pop-up rotary sprinkler with adjustable arc limits has a memory arc mechanism separate from its arc adjustment and head reversing mechanisms for automatically returning the head to oscillation between its pre-set sector limits should its head be twisted or held against normal rotation by a vandal. The sprinkler may optionally include a throttling valve for substantially reducing the flow of water from the nozzle in the head until the head has rotated back within its pre-set arc limits. The amount of water that would otherwise be sprayed onto walkways and highways, for example, is greatly reduced, thereby eliminating safety hazards.

대표청구항 ▼

[ I claim:] [1.] A sprinkler, comprising:a housing having an outlet end;a head including a nozzle for ejecting a stream of water;means for mounting the head at the outlet end of the housing for angular rotation about a vertical axis;means mounted in the housing for driving the head about the axis;me

[ I claim:] [1.] A sprinkler, comprising:a housing having an outlet end;a head including a nozzle for ejecting a stream of water;means for mounting the head at the outlet end of the housing for angular rotation about a vertical axis;means mounted in the housing for driving the head about the axis;means mounted in the housing for pre-setting at least one of a pair of end limits of rotation of the head;means for causing the rotation of the head to reverse a direction of rotation thereof when a rotational position of the head reaches each of the end limits so that the stream of water will travel through a predefined angular sector; andmemory arc means separate from the reversing means for causing the head to return to rotation between the ends limits after the head has been forced outside the end limits.