Adjustment structure of a rotary sprinkler

An adjustment structure of a rotary sprinkler, comprising a rotary seat, a plastic rotary tube body, a rubber pad, several adjustment ball valves and a plastic pressing cover, wherein the rotary seat includes a head portion and a tail portion connected with the head portion by two connecting rods, an adjustment member being disposed on the head portion and formed with a fitting hole on inner side and a water-incoming, head on outer side for connecting with a water pipe, the tail portion being formed with a fitting hole on inner side, the plastic rotary tube body having a close end and an open end, the close end of the rotary tube body being fitted into the fitting hole of the tail portion of the rotary seat, while the open end of the rotary tube body being fitted into the fitting hole of the head portion of the rotary seat, said adjustment structure being characterized in that:

• the rotary tube body is formed with an axial channel on outer wall, several water-outgoing holes being formed on a bottom of the axial channel;
• the rubber pad is rectangular and disposed with several concaves on upper surface, an orifice being disposed on a center of a bottom of each concave;
• each adjustment ball valve has a lower ball portion and an upper post portion, an upward tapered sprinkling hole extending from a center of a top face of the post portion to a bottom end of the ball portion;
• and
• the plastic pressing cover is formed with two leg portions at two ends and several through holes on a surface, each through hole having an inner arch periphery, whereby when assembled, the rubber pad is placed in the axial channel of the rotary tube body with the orifices of the concaves aligned with the water-outgoing holes of the axial channel and then the ball portions of the adjustment ball valves are placed in the concaves of the rubber pad with the post portions faced upward and then the leg portions of the plastic pressing cover are forcedly inserted into the axial channel of the rotary tube body with the pressing cover overlapped on the rubber pad, and the post portions of the adjustment ball valves are passed through the through holes of the pressing cover with the inner arch peripheries of the through holes abutting against a one-third section of the ball portions, and then the leg portions of the pressing cover are fused with two ends of the axial channel of the tube body by high frequency wave, the adjustment ball valves being easily freely respectively adjustable into different water-outgoing angles or into a sprinkling state or a water-sealed state so as to achieve a variety of sprinkling patterns.