Water driven tool

Claim 1

A water driven hand tool, comprising: a water driven turbine, a turbine housing enclosing said turbine, a turbine shaft mounted for rotation in said housing, said turbine being mounted on said shaft for rotation therewith, a housing inlet connected to supply water under pressure to rotatably drive the turbine, a housing outlet to discharge said water from said housing after it has acted on said turbine, an external shaft connected to said turbine shaft to rotate therewith, tool means on the end of the external shaft to be rotated thereby, a valve in said inlet to open and close the inlet to the housing, and a by-pass pipe connected to said inlet and to said valve, said by-pass pipe having a discharge connected to said housing outlet downstream of said valve and said inlet, said valve in a first position being operable to supply water to said housing through said inlet and to shut off water to said by-pass pipe, said valve in a second position being operable to shut off water to said inlet to said housing and to discharge water through said by-pass pipe, said valve in a third position being operable to shut off water to said housing and said by-pass pipe, said outlet being connected to said by-pass pipe so that during normal operation of said turbine, when said valve is in said first position, said water discharges through said by-pass discharge.