Device for feeding fluids

1. An apparatus for dispensing particulate matter from a supply bin to a coater for rapid prototyping, comprising a plough that has a width essentially equal to that of the supply bin and laterally moves at least partially in and out of the supply bin and pushes the particulate matter from the supply bin, through an aperture in the supply bin, to the coater and which when the plough is retracted, pushes the particulate matter out of the supply bin across its width and closes the aperture in the supply bin, whereby there is an adequate quantity of the particulate matter above the plough, further wherein the aperture is dimensioned such that when the plough is at a protracted position outwards of the supply bin the particulate matter is hindered from flowing out due to a seal formed by an angle of repose of the particulate matter at the aperture.

2. An apparatus according to claim 1 , wherein the aperture comprises a gate that can be adjusted in a direction perpendicular to a longitudinal axis of the aperture to change a size of the aperture.

3. An apparatus according to claim 1 , wherein at least one wall of the supply bin is shaped such that it slants inwards.

4. An apparatus according to claim 1 , wherein the supply bin comprises a vibrator.

5. An apparatus according to claim 1 , arranged with a pneumatic means to move the plough.

6. An apparatus according to claim 1 , wherein the supply bin comprises a level detector.

7. An apparatus according to claim 1 , wherein the supply bin is arranged above a metering device in the coater.

8. An apparatus according to claim 1 , wherein the aperture is dimensioned such that when the plough is at a protracted position outwards of the supply bin the particulate matter is hindered from flowing out due to a seal formed by an angle of repose of the particulate matter at the aperture and further wherein the aperture comprises a gate that is adjusted in a direction perpendicular to a longitudinal axis of the aperture to change a size of the aperture.

9. An apparatus according to claim 8 , wherein at least one wall of the supply bin is shaped such that it slants inwards.

10. An apparatus according to claim 8 , wherein the supply bin comprises a vibrator.

11. An apparatus according to claim 8 , wherein the supply bin comprises a level detector.

12. An apparatus for dispensing particulate matter from a supply bin to a coater for rapid prototyping, comprising a plough that has a width essentially equal to that of the supply bin and laterally moves at least partially in and out of the supply bin and pushes the particulate matter from the supply bin, through an aperture in the supply bin, to the coater and which when the plough is retracted, pushes the particulate matter out of the supply bin across its width and closes the aperture in the supply bin, whereby there is an adequate quantity of the particulate matter above the plough, wherein below the supply bin is a metering device in the coater, which is used for dispensing the particulate matter on to a surface to be coated.

13. A method of rapid prototyping a part by filling a coater with a predetermined amount of a particulate matter from a supply bin comprising the steps of:

a. providing a supply bin including a plough that is laterally movable at least partially in and out of the supply bin and which when the plough is fully retracted, closes an aperture in the supply bin;

b. providing a coater located below the supply bin at least when the coater is being filled;

c. providing a gate at the aperture that is adjusted in a direction perpendicular to a longitudinal axis of the aperture to change a size of the aperture;

d. adjusting the gate to set a predetermined amount of the particulate matter to flow out the aperture into the coater;

e. filling the supply bin with the particulate matter;

f. protracting the plough at least partially from the supply bin;

g. retracting the plough laterally into the supply bin, causing, via a pushing force of the plough, the predetermined amount of the particulate matter to flow out the aperture into the coater, thus filling the coater; and

h. repeating steps a-g to form a rapid prototype part.

14. The method of claim 13 , including the step of providing a vibrator with the supply bin and an optional step of vibrating the particulate matter to dislodge any particulate matter hung up in the supply bin.