COMPRESSED AIR SELECTOR

Abstract: A compressed air selector is made up of a circular crown (20), having a plurality of peripheral holes (21), and a tube (10), received within said crown (20), which rotates around the latter's axis, said tube (10) being foreseen with an air input (12) positioned in correspondence ot its axis of rotation.

Description: "COMPRESSED AIR SELECTOR" The present invention refers to a compressed air selector which is used each time it is necessary to feed air to control devices of a plurality of consumptions for instance to a series of receptacles containing liquids which have to be subsequently channelled to tanks which have to be filled. The solution provided up to now foresee a set of electrovalves, one for each consumption, which ccmplicate the circuit making it also very expensive. The aim of the present invention is to carry out a compressed air selector which allows the feeding of air in succession to a great number of consumers with a minimal cost and the highest safety. Said aim has been achieved by foreseeing a compressed air selector made up of a circular crown provided with holes along its periphery and of a tube received within said crown and rotating around the axis of the latter, said tube having the air input located in correspondence with its axis of rotation. The tube is preferably foreseen with an axially perforated head, free to slide within said tube and pushed by a spring against the crown, a seal being provided between the tube and the head. The head surface is moreover so shaped as to follow the circular profile of said crown. Finally it is foreseen that the peripheral holes are sufficiently spaced amoung them, so that a block position for the compressed air can be created between one and the other. The invention will be now better illustrated with the help of an exemplary embodiment shown in the enclosed drawings, wherein Fig. 1 is a top view of the proposed selecting device; Fig. 2 is an exploded view taken along line 2-2 of Fig. 1; and Fig. 3 is a view similar to that of Fig. 2, but with all the pieces assembled. With reference to the drawings it will be noted that the proposed selector is made up of a circular crown, shown in its whole by 20, and by a tube 10. The circular crown is peripherically provided with holes 21 which are spaced from one another at a distance equal to four or five times the diameter of the axial hole 18. The crown 20 is provided with a central hole 22. A shaft 11 axially perforated at 12, is made integral to the tube 10 which rotates concentrically to the crown, said tube 10 being provided with a jut-shaped centering means 25 which is received inside hole 22. The tube 10 will then be able to rotate within the crown 20 each time the shaft 11 is rotated, for instance by a stepped motor which acts on the end 26 of the shaft 11. The axial hole 12 continues perpendicularly to the shaft axis in such a way that the air which passes through hole 12 can then pass through tube 10 and in particular through an axial hole 13. The tube 10 is closed axially, so that only the air coming fram hole 12 can enter. The hole 13 becomes broader at its free end forming a wider hole 14 apt to receive the head 15 provided with a seat 15a for a gasket 16 and an axial hole 18. The head is pushed against the crown internal wall 23 by a spring 17. Between the hole 14 and the head 15, a bushing 19 can be provided. The selector works as follows : the compressed air supplied into hole 12 reaches hole 13 of tube 10, passes through the axial hole 18 of head 15 and arrives then to one of the crown holes 21 if head 15 is positioned in correspondence to it. The selector can instead function as a closing element, in the case the tube 10 and the corresponding head 15 is positioned between a hole 21 and another.

Claims: CLAIMS 1. A compressed air selector characterized in that it is made up of a circular crown (20), having a plurality of peripheral holes (21), and by a tube (10), received within said crown (20), which rotates around the latter's axis, said tube (10) being foreseen with an air input (12) positioned in correspondence of its axis of rotation. 2. A selector according to claim 1, characterized in that the tube (10) is foreseen in output with a head (15) pushed by a spring (17) and free to slide within the tube (10). 3. A selector according to claim 2, characterized in that the head (15) surface has a cylindrical shape. 4. A selector according to claim 3, characterized in that the radius of the head (15) is equal or slightly less for a few tenths of millimeters than the internal radius of the crown (20). 5. A selector according to claim 1, characterized in that the peripheral holes (21) are spaced in such a way that between two adjacent holes (21) there is a solid space sufficient to form a hermetic closing position (pneumatic block).

Inventors: CHINELLO PALMIRO, CHINELLO, PALMIRO
Applicants: FINBIOMEDICA SRL, FINBIOMEDICA S.R.L.
Application year: 1986
Main classification: F15B13
IPC codes: F15B13, F16K11