Patent GB-1002541-A (GB)
Title: Apparatus for the spraying of viscous materials
IPC: B05B15/68
Filed: 1964-02-10
Abstract: 1,002,541. Delivering measured quantities of semi-liquid material. A SCHEFENACKER, [trading as REITTER & SCHEFENACKER KOMM-GES.]. Feb. 10, 1964 [Feb. 9, 1963], No. 5439/64. Heading B8N. [Also in Divisions B2 and F1] Apparatus for spraying viscous material, such as mould-separating or lubrication means in pressure casting machines, comprises at least one dosing spray head 1 having means 20, 21, 27 and 24, 25, 26 for adjusting the quantity dispensed of the viscous material and an atomizing stream respectively, and movable into and out of the spraying position for the repeated issuing of a constant measured amount of spray medium. The dosing spray head includes a piston 8 movable in a cylinder 13 and connected to a valve member 19 slidable in a second cylinder 14, the valve member being coupled to a hollow piston 9 movable in the cylinder 14; a nozzle outlet 17 on the piston 9 is controlled by means of a tapered closure member on the valve 19. An inlet pipe 11 for compressed air leads into the cylinder 13, the air escaping from the cylinder via an annular outlet 18 surrounding the nozzle 17; an inlet pipe 12 is provided for the viscous material which passes into the cylinder via a port 46. The grease is fed into the piston 9 from a cylinder 4 which is carried by a base 6 and which may be raised and lowered, in order to bring the spray head into its spraying position, by means of hollow piston-rod 28 connected to a piston movable in a cylinder 5; the hollow piston-rod is connected, via a valve 33 mounted on a flexible pipe 31 with the upper end of the grease cylinder 4. In operation, as applied to spraying the two halves 54, 55 of a mould in a pressure casting installation, upon actuating a valve 41 in a compressed air feed pipe 42, air is fed, via a pipe 39, to act on the piston attached to the hollow rod 28, thereby moving the base and grease cylinder downwardly to bring the spray head in position. Air is simultaneously fed, via a port 29 in the rod 28, and port 36 in the pipe 31 to the upper end of the grease cylinder 4. The grease is then fed via the inlet 12 and port 46 into the cylinder 14 where, via a port 15, it flows into the piston 9. When the base reaches the position shown in Fig. 4, a collar 34 secured to the pipe 31 contacts an abutment 35 and thereby lifts the valve 33 from its seat and so allows air to flow through a port 37 in the base and, via a flexible pipe 7 and inlet 11, into the cylinder 13. The air then acts on the piston 8 so that; due to an adjustable abutment collar 20 on the valve 19 contacting the piston 9, the latter is raised and causes the grease therein to be forced through the nozzle 17, the grease being atomized by air simultaneously flowing through the annular outlet 18. The duration of the spraying is determined by the position of a screwed member adapted to co-operate with a fixed abutment 24 on the valve 19; the amount of grease dispensed is determined by the position of the collar 20 on a screwed end 21 of the valve 19. As shown in Fig. 4, more than one spray head may be attached to the base 6 and the valve 41 may be actuated either manually or by a solenoid. In a modification, two grease cylinders may be used.