Spray head for a pressurized container

Claim 2

In a spray head for a pressurized container, the head comprising a body part which has a recess and a pin extending from the bottom of the recess a distance substantially less than the depth of the recess and a cup-shaped nozzle insert which is inserted into the recess and pushed over the pin, the end of the pin and the adjoining bottom wall of the insert defining therebetween a swirl-chamber system, the improvement which comprises the outer surface of the insert and the wall of the recess forming a first pair of cooperating surfaces, the inner surface of the insert and the outer surface of the pin forming a second pair of cooperating surfaces, the two pairs of cooperating surfaces being arranged so that the insert is guided into parallelism with the pin axis by the first pair of cooperating surfaces before engagement of the second pair of cooperating surfaces, the inner surface of the insert having oblique directing surfaces for guiding the insert during insertion extending over at least a substantial part of the inner depth of the cup cavity of the insert, said directing surfaces defining a cup cavity which gradually converges inwardly toward the bottom wall from a width greater than the width of the pin to a width substantially equal to the width of the pin.

Claim 3

The improvement of claim 1 wherein the material of the insert is harder and less elastic than the material of the body part.

Claim 4

The improvement of claim 1 wherein the recess has a uniform width from its mouth to the bottom wall.

Claim 5

In a spray head for a pressurized container, the head comprising a body part which has a recess and a pin extending from the bottom of the recess and a cup-shaped nozzle insert which is inserted into the recess and pushed over the pin, the end of the pin and the adjoining bottom wall of the insert defining there-between a swirl-chamber system, the improvement which comprises the outer surface of the insert consisting entirely of a uniform cylinder a cylindrical recess, the wall of the recess and the outer surface of the insert forming a first pair of cooperating surfaces, the inner surface of the insert and the outer surface of the pin forming a second pair of cooperating surfaces, the two pairs of cooperating surfaces being arranged so that the insert is guided into parallelism with the pin axis by the first pair of cooperating surfaces before engagement of the second pair of cooperating surfaces, the inner surface of the insert having oblique directing surfaces for guiding the insert during insertion extending over at least a substantial part of the inner depth of the cup cavity of the insert, said directing surfaces defining a cup cavity which gradually converges inwardly toward the bottom wall from a width greater than the width of the pin to a width substantially equal to the width of the pin, and wherein the insertion of the insert is arrested entirely by the abutment of the pin with the bottom wall of the insert.

Claim 6

In a spray head for a pressurized container, the head comprising a body part which has a recess and a pin extending from the bottom of the recess and a cup-shaped nozzle insert which is inserted into the recess and pushed over the pin, the end of the pin and the adjoining bottom wall of the insert defining there-between a swirl-chamber system, the improvement which comprises the outer surface of the insert consisting entirely of a uniform cylinder a cylindrical recess, the wall of the recess and the outer surface of the insert forming a first pair of cooperating surfaces, the inner surface of the insert and the outer surface of the pin forming a second pair of cooperating surfaces, the two pairs of cooperating surfaces being arranged so that the insert is guided into parallelism with the pin axis by the first pair of cooperating surfaces before engagement of the second pair of cooperating surfaces, the inner surface of the insert having oblique directing surfaces for guiding the insert during insertion extending over at least a substantial part of the inner depth of the cup cavity of the insert, said directing surfaces defining a cup cavity which gradually converges inwardly toward the bottom wall from a width greater than the width of the pin to a width substantially equal to the width of the pin, and wherein the insertion of the insert is arrested entirely by the abutment of the pin with the bottom wall of the insert.

Claim 7

The improvement of claim 4, wherein the oblique directing surface terminates at one end at the bottom of the insert.

Claim 8

The improvement of claim 4, wherein the oblique directing surface is at an angle of less than 30* to the central axis of the insert.

Claim 9

The improvement of claim 4, wHerein the insert bears on its inner, lateral wall at least three ribs, the inwardly directed faces of which constitute together said oblique surface.