US3791580A

US3791580A - Air pressurized actuated atomizer

Info

Publication number: US3791580A
Application number: US00218152A
Authority: US
Inventors: D Taccon; S Giovanni
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-01-17
Filing date: 1972-01-17
Publication date: 1974-02-12
Anticipated expiration: 1991-02-12

Abstract

This invention relates to guns or atomizers for spraying moulds with a lubricating liquid composition. There is the necessity of a fine adjustment of the liquid rate even to interception for cleaning the moulds with pressurized air only. A connector is attached to the end of the liquid feeding duct and the end of the pressurized air duct and is formed with a decompression chamber and a passage from the liquid feeding duct to the air pressurized duct is controlled by an adjustment screw up to total interception of the liquid rate. Such a screw may be actuated by the operator from the outside and cooperates with two annular sealing members acting as a brake against uncontrolled rotation of the adjustment screw and therefore of the adjusted rate of the liquid.

Description

United States Patent [1 1 Taccon [111 3,791,580 1451 Feb. 12, 1974 AIR PRESSURIZED ACTUATED ATOMIZER Danizzo Taccon, Via G. Di Vittario, 353 20099 Sesto S. Giovanni, Milan, Italy 1221 Filed: Jan. 17, 1972 21 Appl. No.: 218,152

Related US. Application Data [63] Continuation of Ser. No. 869,602, Oct. 27, I969,

[76] Inventor:

abandoned.

[52] US. Cl 239/414, 239/416.2, 239/434 [51 Int. Cl B05!) 7/04 [58] Field of Search 239/413, 414, 416.2, 426, 434, 239/527, 581, 407

[56] References Cited UNITED STATES PATENTS 1,304,293 5/1919 Foley 239/427.5

1,450,000 3/1923 Jockers 239/413 1,462,020 7/1923 Murray 239/416.2 1,587,736 6/1926 Schenck.... 239/434 X 2,380,827 7/1945 Downs 239/527 X 3,179,341 4/1965 Plos et al. 239/414 Johnson et al 239/414 Shashkov 239/413 X Primary Examiner-M. Henson Wood, Jr. Assistant Examiner-John J. Love A Attorney, Agent, or FirmEric H. Waters et al.

[ 5 7 ABSTRACT This invention relates to guns or atomizers for spraying moulds with a lubricating liquid composition. There is the necessity of a fine adjustment of the liquid rate'even to interception for cleaning the moulds with pressurized air only. A connector is attached to the end of the liquid feeding duct and the end of the pressurized air duct and is formed with a decompression chamber and a passage from the liquidfeeding duct to the air pressurized duct is controlled by an ad- .justment screw up to total interception of the liquid rate. Such a screw may be actuated by the operator from the outside and cooperates with two annular sealing'members acting as a brake against uncontrolled rotation of the adjustment screw and therefore of the adjusted rate of the liquid.

8 Claims, 3 Drawing Figures 1 AIR PRESSURIZED ACTUATED ATOMIZER CROSS RELATED APPLICATION This Application is a continuation of Ser. No. 869,602 filed Oct. 27, 196 9, and now abandoned.

BACKGROUND OF THE INVENTION In the art there are known a number of atomizers or atomizing guns utilizing a jet of pressurized air for spraying a liquid, the liquid to be sprayed being mixed with the air and expelled as a fine mist, for example against a mould to be cleaned or lubricated.

The atomizing nozzle is adjustable in order to give the possibility of adjusting the atomization rate. A problem arising from the use of such atomizers consists in the possibility of adjusting the rate of the liquid such as required by the operator in conformity with the different work stages as required by the treatment of a mould surface. In practice, liquid variation range from a maximum to a null is required.

An object of the invention is to provide an atomizer provided with means able to adjust the liquid rate with no addition of expense to the cost of manufacture.

SUMMARY OF THE INVENTION This object is attained by providing an atomizer of the kind comprising a support body, a liquid feeding duct and an air pressurized duct connected to the sup-. port body, a delivery valve for the pressurized air feeding duct and a delivery valve for the liquid feeding duct, a control lever pivotally mounted on the support body, and actuating in a depressed position both said valves, a pressurized air nozzle mounted at the end of the pressurized air duct, a connector member connecting the ends of the pressurized air duct and of the liquid duct and formed with a suction chamber, an atomizing nozzle connected to the said connector and fed through the said suction chamber, an adjustment screw formed with a head projecting from the connector to be actuated from the outside and controlling the size of the passage between the end of the liquid feeding duct and the suction chamber, whereby the atomizing nozzle may be fed with a variable liquid rate in dependence of the adjustment of the said adjusting screw. It has been found that a prolonged conical shaped end of the said adjustment screw cooperating with a complementary conical hole formed from the said connector improves the adjustment possibility of the liquid rate.

Other objects and advantages of the invention will become evident from the following description of a preferred exemplary embodiment of the invention as illustrated in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 3 is a bottom view according to the lines C D of FIG. 1.

This atomizer comprises a support body 7 to be connected with two unions ll, 12 the union 11 being in turn connected to a pressurizedair source (not shown) and the union 12 being connected to a reservoir (not shown) of the liquid to be sprayed, for example, against the surface of a mould.

As known in the art, there is provided a control lever pivoted to a pin 15 fixed to the support body 7 and able to depress two

stems

14, 13 actuating respectively a first valve (not shown) for the delivery of the liquid from the union 12 to the duct 4 and a second valve (not shown) for controlling the delivery of the pressurized air from the union 11 to theduct 5.

The

ducts

4 and 5 are bent and connect to a connector 8, combined, as known, with an atomizing nozzle 5, the spray of which has been shown at numeral 9. A transversal duct or passage 2 is formed in the connector, said passage connecting the two

ducts

5 and 4. As apparent from the drawing, the end of the duct 5 is associated with an air nozzle feeding the air into a chamber formed in the connector, so as to produce a very high velocity of the air.

The high velocity of the air causes a strong suction of the liquid from the duct 4 in the direction of the arrow in the transversal duct 2, towards the chamber 30. The liquid passage from the duct 2 to the chamber is,

I according to the invention, controlled by an adjustment screw 6 ending with a conical prolonged spindle 1, the latter cooperating with a complementary conical hole formed in the connector body. The arrangement is such that the adjustment screw may be moved to total interception of the passage of the liquid to the decompression chamber 30. An un'threaded cylindrical section of the adjustment screw cooperates with two elastic rings 60-60, these rings acting as sealing members and also as friction members for resisting the rotation of the adjustment screw.

It is pointed out that some treatment of the moulds requires a feed of pressurized air mixed with a minimal percentage of liquid, whereby this adjustment is of great importance. The adjustable nozzle 9 may be locked in the adjusted position by a stop nut 19. The prolonged conical spindle l of the adjustment screw 6 has given excellent results during practical tests. As seen in FIG. 2 the axis of the spindle is substantially in alignment with the end of duct 2.

What I claim is:

1. A mould cleaning and lubricating device comprising in combination a support body, a lubricating liquid feed duct, a pressurized air feed duct, said ducts being a both connected to the support body, a first delivery valve for the pressurized air feed duct and asecond delivery valve for the lubricating liquid feed duct, a single control lever pivotally mounted on the support body, and actuating in a depressed position both said first and second valves, an atomizing nozzle mounted at the end of the pressurized air feed duct, a connector body connecting the adjacent ends of the pressurized air duct and the lubricating liquid duct, said connector body having a decompression chamber, an atomizing head removably connected to the said connector body and fed through the said decompression chamber, a needle valve formed with a head projecting from the connec tor body for manual actuation from the outside to control the passage of lubricating-liquid between the end of the liquid feed duct and the said decompression chamber, by greater or lesser physical obstruction thereof, whereby the atomizing head may be fed with pressurized air only and with variable liquid rate in dependence of the adjustment of the said needle valve, said connector body having a hollow portion constituted by a conically tapered section extending in narrowing fashion from the inlet for lubricating liquid towards said decompression chamber, and a cylindrical section smoothly merging with the conically tapered section in continuation thereof and opening directly into the decompression chamber adjacent the atomizing nozzle, the needle valve including a frustum cone shaped terminal portion cooperating with said hollow portion formed in said connector body, the longitudinal axis of the hollow portion and the axis of the atomizing nozzle being perpendicular to one another.

2. A device as claimed in claim 1 wherein said needle valve has a central axis which is aligned with the edge of the atomizing nozzle.

3. A device as claimed in claim 2 wherein said cylindrical section of the hollow portion has a smaller length than the tapered section.

4. A device as claimed in claim 1 wherein said cylindrical section and conical section have the same diameter where they smoothly merge.

5. A device as claimed in claim 1 wherein said needle valve includes a smooth cylindrical portion received in said connector body, and two elastic annular members 4 on said smooth cylindrical portion and engaging said connector body to seal the needle valve in said connector body while resisting relative rotation therebetween.

6. A device as claimed in claim 1 wherein said atomizing head is threadably engaged in said connector body, and a stop nut on said atomizing head for locking the head in adjusted position.

7. A device as claimed in claim 1 wherein the length of the cylindrical portion of the connector body and the length of the cone shaped terminal portion is such that when said needle valve is engaged with the walls of the conically tapered section, the needle valve extends into the cylindrical section of said hollow portion over a substantial portion of the length of said cylindrical section.

8. A device as claimed in claim 1 wherein said air feed duct and liquid feed duct are rigid and formed with a right-angle bend between the support body and the connector body.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. v Dated February 1 2,

Danizzo Taccon Inventor(s) It is certifiedthat error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet insert [30] Foreign Application Priority Data Italy 24417A/68 I NOV. 30 1968 Signed and sealed this 24thday of September 1974.

(SEAL) Attest:

MCCOY M. GIBSON JR. C. MARS HALL DANN Attesting Officer Commissioner of Patents FORM PO-105O (30-691- USCOMMuDC 60376- 59 u.sv GOVERNMENT PRINTING UFFICE: 930

Claims

1. A mould cleaning and lubricating device comprising in combination a support body, a lubricating liquid feed duct, a pressurized air feed duct, said ducts being both connected to the support body, a first delivery valve for the pressurized air feed duct and a second delivery valve for the lubricating liquid feed duct, a single control lever pivotally mounted on the support body, and actuating in a depressed position both said first and second valves, an atomizing nozzle mounted at the end of the pressurized air feed duct, a connector body connecting the adjacent ends of the pressurized air duct and the lubricating liquid duct, said connector body having a decompression chamber, an atomizing head removably connected to the said connector body and fed through the said decompression chamber, a needle valve formed with a head projecting from the connector body for manual actuation from the outside to control the passage of lubricating liquid between the end of the liquid feed duct and the said decompression chamber, by greater or lesser physical obstruction thereof, whereby the atomizing head may be fed with pressurized air only and with variable liquid rate in dependence of the adjustment of the said needle valve, said connector body having a hollow portion constituted by a conically tapered section extending in narrowIng fashion from the inlet for lubricating liquid towards said decompression chamber, and a cylindrical section smoothly merging with the conically tapered section in continuation thereof and opening directly into the decompression chamber adjacent the atomizing nozzle, the needle valve including a frustum cone shaped terminal portion cooperating with said hollow portion formed in said connector body, the longitudinal axis of the hollow portion and the axis of the atomizing nozzle being perpendicular to one another.

5. A device as claimed in claim 1 wherein said needle valve includes a smooth cylindrical portion received in said connector body, and two elastic annular members on said smooth cylindrical portion and engaging said connector body to seal the needle valve in said connector body while resisting relative rotation therebetween.