US2010108721A1PendingUtilityA1

Dispensing device for liquids

42
Assignee: SYNGENTA CROP PROT INCPriority: Oct 2, 2006Filed: Oct 1, 2007Published: May 6, 2010
Est. expiryOct 2, 2026(~0.2 yrs left)· nominal 20-yr term from priority
Inventors:Klemenz Josef Andermatt
G01F 13/006G01F 15/001G01F 11/04
42
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Claims

Abstract

A dispensing device for dispensing a predetermined amount of liquid which is supplied to the device under pressure in which the amount of liquid dispensed by the device is determined by a timer which comprises a piston moving within a cylinder whose speed of movement from an open position, in which the flow to the outlet valve is open, to a closed position, in which the flow to the outlet valve is closed, is controlled by a damping mechanism, characterised in that the damping mechanism is a liquid which is pumped by the piston through an orifice, is claimed. The volume which is to be dispensed by the device can conveniently be adjusted by changing the size of said orifice. In a preferred embodiment the invention is suitable for dispensing a predetermined volume of liquid, preferably a solution of agricultural chemicals, for spot application of said chemicals.

Claims

exact text as granted — not AI-modified
1 . A device for dispensing a predetermined amount of liquid which is supplied to the device under pressure in which the amount of liquid dispensed by the device is determined by a timer which comprises a piston moving within a cylinder whose speed of movement from an open position, in which the flow to the outlet valve is open, to a closed position, in which the flow to the outlet valve is closed, is controlled by a damping mechanism, characterised in that the damping mechanism is a liquid which is pumped by the piston through an orifice. 
   
   
       2 . A device according to  claim 1  in which the damping mechanism is adjustable so as to vary the damping effect. 
   
   
       3 . A device according to  claim 2  in which the size of the orifice is adjustable so as to vary the damping effect. 
   
   
       4 . A device according to  claim 3  in which the size of the orifice is adjusted by means of a throttle valve. 
   
   
       5 . A device according to  claim 1  in which the piston is biased towards the closed position by a biasing means. 
   
   
       6 . A device according to  claim 5  in which the biasing means is a spring. 
   
   
       7 . A device according to  claim 5  in which the piston can be moved against the biasing means by liquid pressure so as to move it to the open position. 
   
   
       8 . A device according to  claim 7  in which the pressure is that of the liquid supplied to the device. 
   
   
       9 . A device according to an  claim 1  in which the liquid is an agricultural liquid. 
   
   
       10 . A device according to  claim 1  in which the device further comprises a filter. 
   
   
       11 . A device according to  claim 10  in which the filter is detachable. 
   
   
       12 . A device according to  claim 1  in which the device further comprises a lance. 
   
   
       13 . A device according to  claim 12  in which the lance has a control valve at the tip of the lance. 
   
   
       14 . A device according to  claim 1  in which the device is hand-held. 
   
   
       15 . A knapsack sprayer which comprises a device according to  claim 1 . 
   
   
       16 . A method of using a device according to  claim 1  to spray an agricultural liquid. 
   
   
       17 . A method of using a knapsack sprayer according to  claim 15  to spray an agricultural liquid.

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