Patent ID: 7311588
Filing Date: 2007-12-25
Classification: B24B

Abstract:
1. A water grinder comprising: a housing in which a rotary shaft is drivably disposed, an outer end of the rotary shaft protruding out from the housing for mounting a grinding tool at the outer end, the rotary shaft being formed with an internal axial passage; a water incoming flow way formed in the housing for the water to flow in, a chamber being formed in the housing and connected with a front end of the flow way, the chamber communicating with the passage of the rotary shaft; a valve rotatably disposed in the chamber corresponding to an inner end of the rotary shaft, a cavity being formed at a rear end of the valve, the cavity communicating with the front end of the water incoming flow way, at least one conducting hole being formed on a circumference of the valve to communicate with the cavity; a selection switch arranged on the circumference of the housing for a user to shift, the valve being connected with the selection switch, whereby when shifting the selection switch, the valve is driven and displaced; an external water discharging assembly disposed at a front end of the housing, the external water discharging assembly having at least one water outlet; and a water flow bypass, one end of the water flow bypass communicating with the external water discharging assembly, while the other end of the water flow bypass communicating with the chamber; whereby, by means of rotating the selection switch, the conducting hole of the valve being aligned with the passage of the rotary shaft or the water flow bypass, the water is discharged from the outer end of the rotary shaft or from the water outlet of the external water discharging assembly.