NZ270539A - Spray head: support tube to nozzle cap seal provided by o-ring in support tube end flange periphery - Google Patents

Description

270539 •: ■/ ) :; ' >v Specification Fifed: £oS6lS/ofe\ - I I Pu! Hoa«on Date: 2..5..J.UN..139S-.

| F.O Journal No: Under th« provisions of Reo»- l*5*£Xi 33 (1) the Specification has bow an to trritwris No: Date: Divided out of Application 245060 Filed 9 November 1992 NEW ZEALAND Patents Act 1953 COMPLETE SPECIFICATION A SPRAY HEAD * P 1 * *' We, EXELL TRADING PTY. LIMITED an Australian company of Lot 4/ Meriden Avenue, Glenorie, New South Wales 2110, Australia do hereby declare the invention, for which we pray that a Patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement 270539 The present invention relates to spray heads having nozzles, and in particular, to a spray head which is used for a horticultural sprayer.

There are many known types of spray heads which can be used for horticultural sprays and the like. Different types of nozzles provide a different type of spray emanating therefrom. Most nozzles provide a spray having the shape of a cone whereby the water or liquid being sprayed forms the outside surface of the cone only. Most nozzles are adjustable to provide for finer or coarse droplets of spray as required.

Even though such described nozzles are used widely, one major disadvantage is that the spray only forms the outside periphery of a cone. Therefore when spraying the water or liquid, centre target area, is left almost dry.

One known type of spray head as described in EPA353984 by Yap Yeon Cheng, provides a spray which has an even distribution of droplets throughout the middle of the cone. This particular nozzle of this spray head uses an outer disc having a plurality of nozzle holes in order to produce the even type spray.

Disadvantages of this spray head are that it is complicated to manufacture, difficult to adjust the cone angle of the spray without wetting the fingers and the nozzle disc must be rotated numerous times to effect adjustment of the spray cone angle. Furthermore, there is insufficient sealing to prevent backflow of water. 270 It is an object of the present invention to provide a spray head which incorporates an improved seal.

According to one aspect of the invention there is provided spray head comprising a tubular body having an inlet 5 and an outlet, and a cap rotatably and slidably mounted on said body covering said body and having at least one spray forming nozzle therein, wherein said outlet has an end flange with an O-ring means located around the periphery of said flange, and said O-ring means co-operates with said cap to 10 provide a seal as the cap is moved relative to said body.

In order that the invention may be more readily understood and put into practical effect, reference will now be made to the accompanying drawings in which Fig 1 is a side view of the spray head of a first 15 embodiment of the invention, Fig 2 is a longitudinal cross-sectional view through the spray head of Fig 1, and Fig 3 is a longitudinal cross-sectional view of a double spray head of a second embodiment of the 20 invention.

The spray head 1 of the preferred embodiment as illustrated in the drawings includes a tubular body 2 with an inlet 4 and an outlet 8. A collar 3 is located at the inlet 4. A supply tube 5 forms a friction fit with the inside 25 surface of the collar 3, and abuts against a shoulder 24a located on the internal surface of the tubular body 2. The collar 3 has three annular ribs 6 located on the outside 27053 surface of the collar 3. The annular ribs 6 are provided for strength as well as providing support for a cap 7.

The cap 7 fits over the outlet 8 of the turbular body 2. The cap 7 has an end 9 with a number of apertures or spray 5 forming nozzles 11 positioned in front of the outlet 8. The outlet 8 has an end flange 14 with an O-ring 15 located around its outside surface. The O-ring 15 abuts against the internal surface of the cap 7 and provides a pressure seal.

The end 9 of the cap 7 of the first embodiment, as 10 illustrated in Pig 2 has four apertures or spray forming nozzles 11 located therein. Each nozzle 11 opens into a corresponding substantially circular depression 12 on the outside surface of the cap 7. The end 9 of the cap 7 has an annular rim 24 projecting from the outside surface thereof. A 15 further circular depression 13 is located on the inside surface of the cap 9 opposite to the outlet 8. Each nozzle 11 is connected to the circular depression 13 by a corresponding groove. The combination of the circular depression 13, the grooves, the nozzles 11, the circular depressions 12 and the 20 annular rim 24 provide for a spray which has a distribution of droplets in the form of a solid cone.

A cantilever protrusion 16 extends from the flange 14 of the tubular body 2 and is resiliently movable in a radial direction relative to the tubular body 2. The protrusion 16 25 has a button 17 located on the free end 18 of the protrusion 16. The button 17 protrudes outwardly in a radial direction.

The cap 7 has a shoulder 18a and a main sleeve 27053g portion 19. The shoulder 18a is located adjacent the O-ring 15. Located in the main sleeve portion 19 is a partial helical slot 20 within which the button 17 is located. The protrusion 16 is urged against the main sleeve portion 19 and the button 17 prevents the cap 7 being removed from the tubular body 2. To remove the cap 7 from the tubular body 2, the button is depressed thus allowing the cap 7 to be moved in an axial direction away from the button 17. This allows one cap 7 to be removed and a similar cap 7 (not illustrated) having differently sized nozzle apertures 11, to be positioned on the tubular body 2.

The engagement of the button 17 and the partial helical slot 20 converts rotational movement of the cap 7 into longitudinal movement thereof. This adjusts the distance between the spray forming nozzles 11 and the outlet 8 to adjust the cone angle of the spray. Because of the coarse pitch of the slot 20, the amount of rotation of the cap 7 required to effect adjustment of the spray cone angle is minimal.

As illustrated in Pig 1, the cap 7 has a scalloped flange 21 at its end closest the inlet 4. The internal surface 22 of the scalloped flange 21 rests on two of the annular ribs 6. This provides for a neat appearance as well as providing support for the cap 7.

A double headed spray head 30 is illustrated in Fig 3. The double headed spray head 30 includes two spray heads 1 as described above located on a bifurcated tube 32. The 27053 bifurcated tube 32 has a sleeve 33 which duplicates the shoulder 18 and sleeve portion 19. Thus the tube 32 is able to be fitted over the tubular body 2 in a similar manner as described above. In this case, the partial helical slot 20 on 5 the cap 7 is replaced by a circular hold 34 which receives the button 17. Thus, there is no relative rotation between the sleeve 33 and the tubular body 2.

The foregoing describes only two embodiments of the present invention, and modifications obvious to those skilled 10 in the art can be made thereto without departing from the scope of the present invention.

Claims (10)

270539 -7- WHATWE CLAIM IS:-

1. A spray head comprising a tubular body having an inlet and an outlet, and a cap rotatably and slidably mounted on said body covering said body and having at least one spray forming nozzle therein, wherein said outlet has an end flange with an O-ring means located around the periphery of said flange, and said O-ring means co-operates with said cap to provide a seal as the cap is moved relative to said body.

2. A spray head according to claim 1 and further including a protrusion fixed on said tubular body and resiliently movable in a radial direction relative to said tubular body and wherein, said cap has a partial helical slot therein into which protrusion is receivable such that engagement of said protrusion and slot converts rotational movement of said cap into longitudinal movement thereof to adjust the position of said spray forming nozzle(s) relative to said outlet, said cap being releasable from said tubular body by radial depression of said protrusion and disengagement thereof from said slot.

3. A spray head according to claim 1 or claim 2 wherein the or each said nozzle opens into a first corresponding substantially circular depression on an outside surface of said cap. * * - ^

4. A spray head according to claim 3 wherein a!<> second j r>y * 22 MAR I986 '/ o /f r. ■// 27053-9 corresponding circular depression is located on an inside surface of said cap opposite said outlet, each said nozzle being connected to the second corresponding circular depression by a corresponding aperture.

5. A spray head according to claim 4 wherein said outside surface of said cap comprises a substantially circular end surrounded by an annular rim.

6. A spray head according to claim 5 wherein said cap has four nozzles.

7. A spray head according to claim 2 wherein said protrusion comprises the free end of a cantilever which extends from said flange at the outlet end of said tubular body towards the inlet end of said tubular body.

8. A spray head according to claim 7 wherein said free end comprises a button located at said free end, said button projecting outwardly in a radial direction and being received in said slot.

9. A spray head according to claim 2 wherein said tubular body has at least one annular rib at its end nearest said inlet, said annular rib(s) supporting said cap.

10. A spray head according to claim 1 wherein said cap has a shoulder and a main sleeve portion, said shoulder co-_ 270539 operating with said O-ring. EXELL TRADING PTY LIMITED By their Attorney DON HOPKINS & ASSOCIATES ■ *.' f" ■, ...... D;;. / 22 MAR 1998 ^