Lawn sprinkler with replaceable sprinkler assembly

Claim 1

A lawn sprinkler which may be disassembled for replacement of the sprinkler assembly to accommodate changes in surrounding soil or grass level, comprising: a sprinkler body having a substantially cylindrical shape, the upper end thereof being opened, an inlet at the bottom end thereof for receiving water into said sprinkler body from an underground supply of water under pressure, and a closure member removably connected to the upper end of said sprinkler body and including a central passageway, a sprinkler assembly mounted for movement relative to said sprinkler body between a retracted position and an extended position including a longitudinally extending pipe for the passage of water therethrough, said pipe being arranged to slidably extend through said central passageway so that the upper end is outside of said sprinkler body, a sprinkler head removably connected to the upper end of said pipe, a base member connected to the lower end of said pipe and responsive to water received under pressure through said inlet to actuate said sprinkler assembly from said retracted position to said extended position, whereby water is forced through said pipe and is dispersed by said sprinkler head, a coil spring mounted on said pipe and operatively connected thereto to be compressed when said sprinkler assembly is actuated to said extended position, and to be expanded for urging said sprinkler assembly from said extended position to said retracted position upon the discontinuation of water pressure, and said sprinkler assembly and coil spring being so constructed that they are slidably removable as a unit and in a single operation from the upper end of said sprinkler body for replacement thereof with different length pipes to accommodate changes in surrounding soil or grass level requiring only the removal of said closure member from the upper end of said sprinkler body which is accomplished manually and without any tools while said sprinkler body remains connected to said underground water supply.