Water Supply for a Hand-Held Power Tool

Abstract

A water supplying device of a hand-held power tool has a water-conveying line and a valve arrangement arranged in the line for controlling the water flow through the line. The valve arrangement has a control valve with a valve body adjustable across a positioning travel. The opening cross-section of the control valve, as a function of the positioning travel, has a progressive characteristic line. An arrangement for actuating the water supplying device has an actuator that is separate from additional control elements of the power tool.

1 . A water supplying device of a hand-held power tool, the device comprising: 
 a water-conveying line;    a valve arrangement arranged in the line for controlling a water flow through the line;    the valve arrangement comprising a control valve with a valve body adjustable across a positioning travel;    wherein an opening cross-section of the control valve, as a function of the positioning travel, has a progressive characteristic line.    
   
   
       2 . The device according to  claim 1 , wherein the progressive characteristic line comprises two at least approximately linearly extending portions.  
   
   
       3 . The device according to  claim 2 , wherein the two at least approximately linearly extending portions are angled progressively relative to one another.  
   
   
       4 . The device according to  claim 1 , wherein the valve body is configured to have an opening action away from a rest position of the valve body which opening action is neutral relative to an admission pressure of the water pressure at a supply side of the control valve.  
   
   
       5 . The device according to  claim 1 , wherein the control valve acts as a shut-off valve.  
   
   
       6 . The device according to  claim 1 , wherein the valve arrangement comprises a shut-off valve that is connected flow-conductingly in series to the control valve and is arranged upstream of the control valve.  
   
   
       7 . The device according to  claim 6 , wherein the shut-off valve is a solenoid valve.  
   
   
       8 . The device according to  claim 6 , wherein the shut-off valve is a mechanical valve with pneumatic control.  
   
   
       9 . The device according to  claim 8 , wherein the pneumatic control employs a pneumatic signal that is an operating signal of a drive motor of the power tool, wherein the operating signal is a crankcase pressure of the drive motor.  
   
   
       10 . An arrangement for actuating a water supplying device of a hand-held power tool, the water supplying device comprising a water-conveying line; a valve arrangement arranged in the line for controlling a water flow through the line; wherein the valve arrangement comprises a control valve with a valve body adjustable across a positioning travel; wherein an opening cross-section of the control valve, as a function of the positioning travel, has a progressive characteristic line; the arrangement comprising: 
 an actuator acting on the valve arrangement, wherein the actuator is configured separate from additional control elements of the power tool.    
   
   
       11 . The arrangement according to  claim 10 , wherein the actuator comprises an actuating element that actuates the control valve and further comprises an on/off switch that actuates the shut-off valve and is separate from the actuating element.  
   
   
       12 . The arrangement according to  claim 10 , wherein the actuator comprises a rotatable setting roller.  
   
   
       13 . The arrangement according to  claim 10 , wherein the actuator comprises an actuating slide.  
   
   
       14 . The arrangement according to  claim 13 , wherein the actuating slide is pivotably guided in a groove.  
   
   
       15 . The arrangement according to  claim 10 , wherein the actuator comprises a pivotable setting lever connected to an axle stub that projects at least partially outwardly and defines an axis of rotation of the setting lever.  
   
   
       16 . The arrangement according to  claim 10 , wherein the actuator has an actuating knob that can be pushed in an axial direction of the actuating knob.  
   
   
       17 . The arrangement according to  claim 16 , wherein the actuator comprises an on/off switch that is a pushbutton switchable between two switching positions for actuating the shut-off valve, wherein the actuating knob is part of the on/off switch.  
   
   
       18 . The arrangement according to  claim 10 , wherein the actuator is a pivot lever arranged on a handle of the power tool and projecting from a surface of the handle.  
   
   
       19 . The arrangement according to  claim 18 , wherein the pivot lever is arranged on a bottom side of the handle and projects from the bottom side.  
   
   
       20 . The arrangement according to  claim 10 , wherein the actuator has an on/off switch for actuating the shut-off valve, wherein switching of the on/off switch is coupled to an operating readiness or an operation of the power tool.  
   
   
       21 . The arrangement according to  claim 20 , wherein the on/off switch is switched by the weight of the power tool.  
   
   
       22 . The arrangement according to  claim 20 , wherein the shut-off valve is a pneumatic valve and the on/off switch is realized by pressure loading the pneumatic valve by a pressure generated by a drive motor of the power tool.  
   
   
       23 . The arrangement according to  claim 20 , wherein the on/off switch is switched by a part of the power tool that is moved upon operation of the power tool.