US1760373A - Spray head - Google Patents

Description

M y 1930- J. E. PERRIN 1,760,373

SPRAY HEAD Filed March 14, 1927 Patented May 27, 1930 UNITED STATES PATENT OFFICE JAMES E. PERRIN, 0F TOLEDO, OHIO, ASSIGNOR TO THE DE VILBISS COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO SPRAY HEAD Application filed March 14, 1927.

This invention relates to spray-heads for use particularly in connection with spraying devices for applying materials in spray form to surfaces to be coated.

In devices of this character it is customary to discharge supplemental air jets against opposite sides of the main surface coating spray stream to effect a flattening and broadening thereof, or to create what is commonly referred to as a fan spray.

The object of this invention is the provision in a spray-head of this character of simple, eflicient and novel means for completely opening or closing the supplemental air discharge jets, or regulating the pressure of discharge of air therefrom, as conditions may require.

The invention is fully described in the following specification and one embodiment thereof. illustrated in the accompanying drawings, in which,

Figure 1 is a side elevation of a spray-head embodying the invention with a part in central longitudinal section. Fig. 2 is a front end elevation thereof, and Fig. Sis a section on the line 33 in Fig. 1.

Referring to the drawings, 1 designates the portion of a spray-gun body to which the s 'n'ay-head is attached and which with the spray-head, in the present instance, may be considered as the spray-head unit, inasmuch as it detachable as a unit from the spraygun body proper. The assembled connection with a spray-gun body of such a unit equipped with a diii'erent construct-ion of spray-head is illustrated in U. S. Letters Patent No. 1,613,588, dated January 1, 1927.

The body member 1 is provided at its forward end with an eniargement 2, which, in the present instance, is externally threaded to permit the engagement therewith of a union nut 8. The body 2 has an axially disposed bore or passage 4 therein for communicating through a nipple 5 and any suitable connection with a source'of supply of the material to be sprayed. The inner or material discharge nozzle 6 of the spray-head is threaded into the forward end of the body member bore 4 andhas its forward end reduced and terminating in a restricted discharge nipple Serial No. 175,140.

7 with its discharge passage in communication with the bore a, as well understood in the art.

The outer or air discharge nozzle 8 is of cup form having the cylindrical cavity or air space 9 in its rear side and having its forard side provided with a centrally disposed air discharge orifice 10 through which the nipple T centrally projects in spaced relation thereto. The union nut 3 engages the. rear end of the nozzle 8 and holds it seated, in the present instance, against a conical seating surface 11 of the body member enlargement 2 in a manner to permit a turning of the nozzle relative to the body member. The air chamber 9 of the nozzle 8 is in communica' tion with a source of air pressure supply through a passage 12 in the enlargement 2.

Provision is made between the forward ends of the nozzles 6 and 8 for the passage of air from the space 9 to the air discharge orilice 10. The nozzle 8 also has provision for the discharge of su 'oplemental air streams from the space 9 through two supplementai air passages 13 disposed at opposite sides of the nozzle axis. The outer ends of these passages are disposed to direct their streams of air into opposed flattening engagement with the main material. laden stream issuing from the central orifices of the two nozzles. The inner ends of the passages 13 open into an annular channel 14 provided in the inner side of the outer end wall of the nozzle 8, such channel being in communication with the air space 9.

A cylindrical or ring valve 15 is threaded in the nozzle 8 within the space 9 and has its forward end projecting into the channel 1 1 and adapted to seat against the bottom of such channel and close the communication between the air space 9 and supplemental air passages 13. The inner side of the annular portion of the valve 15, which projects into the channel lt, coacts with the inner wall 16 of said channel to regulate the flow of airbetween the space 9 and passages 13, the wall 16 being tapered for that purpose, so that as the valve is turned rearwardly the space between it and the wall 16 is gradually broadened. When the valve is seated, it may coact with the inner end portion of the wall 16 to completely close the communication between the space 9 and passages 13.

The inner nozzle 6 has a portion disposed within the air space 9 of the outer nozzle which is straight for a distance axially of the nozzles and is projected through an inturned flange 17 provided at the inner or rear end portion of the valve 15, so that the valve may have sliding movements lengthwise of the inner nozzle. The engagement. of the nozzle 6 and flange 17 of the valve is such, however, that they are prevented from having relative turning movements. For this purpose, the coacting surfaces of the two members may be hexagonal, as shown, or of any other suitable irregular form. Holes 18 may be provided through the valve flange 17 for the passage of air from one side to the other thereof.

It is apparent that a turning of the outer nozzle member 8 relative to the body member 1 and nozzle 6 will eiiect an axial adjustment of the valve 15 due to the threaded engagement of the valve with the nozzle 8 and the anchoring of the valve against turning relative to the inner nozzle. It is also apparent that either by reason of the pitch of the thread between the nozzle 8 and valve 15 or by reason of the incline of the wall 16 of the channel 14-, the nozzle 8 may be turned a considerable extent without any material change in the pressure of discharge of air from the supplen'iental passages 13. This is important in order that the nozzle 8 may be turned to vary the plane of flatten ing of the main spray stream within substantially a 360 adjustment without perceptibly or materially varying the pressure of discharge of the air streams from the supplemental passages.

I wish it understood that my invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of embodiment in difierent forms without departing from the spirit of the claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a spray-head of the class described, inner and outer nozzles mounted for rela tive rotary adjustment and the outer nozzle having supplemental air discharge passages, 11 valve between the nozzles for regulating the discharge of air from the supplemental passages and movable by a relative turning of the nozzles, to open or close said passages or to vary the discharge of air therefrom, the actuated movements of the valve being relative to both nozzles.

2. In a spray-head of the class described, inner and outer relatively rotatable nozzles, the outer nozzle having supplemental air discharge passages, a valve mounted within the outer nozzle in connection with both of said nozzles and operable to have axial movements to open or close the air passages and to regulate the discharge of air therefrom by a relative turning of the nozzles.

3. In a spray-head of the class described, an inner material discharge nozzle, an outer air discharge nozzle having air space therein adapted to have communication with a source of air pressure supply and having supplemental air discharge passages, a valve mounted within the outer nozzle and operable to have movements axially of the sprayhead to open or close said passages and to regulate the pressure of discharge of air therefrom by a relative turning of the nozzles 4. In a spray-head of the class described, inner and outer relatively rotatable nozzles forming an air space therebetween, adapted to have communication with a source of air pressure supply, the outer nozzle having supplemental air discharge passages, and a valve disposed in said air space for controlling the discharge of air from said passages, said valve being threaded to one of said nozzles and having sliding engagement with a stationary part of the spray-head, whereby a turning of the nozzle to which the valve is threaded will impart axial movement to the valve to regulate the discharge of air from said passages.

5. In a spray-head, an air discharge nozzle having supplemental air discharge passages, a valve threaded in said nozzle for relative rotary and axial movements and adapted by its axial movements to control the discharge of air from said passages, and stationary means with which the valve has axial sliding but non-rotatable movements when the outer nozzle is rotated.

6. In a spray-head of the class described,

' an outer air discharge nozzle having an air space therein adapted to have communication with a source of air pressure supply, an annular channel in the bottom of said space at the forward end of the nozzle, and supplemental air passages leading from said channel, one sidewall of said channel being tapered, a ring valve threaded in the nozzle and having a portion extending into said channel and cooperating with said tapered wall to regulate the pressure and quantity of air discharge from said passages when the valve and nozzle have relative axial adjustment by a relative turning thereof, and means within the valve permitting axial movements of the same but preventing rotation thereof.

7 In a spray-head of the class described, inner and outer nozzles cooperating to form an air space therebetween ada )ted to have communication with a source 0 air pressure supply, said nozzles being relatively rotatable and the outer nozzle having an annular channel in the forward end of said air space provided with a tapered sidewall and having supplemental air discharge passages leading from said channel, a valve mounted in said air space and cooperating with the tapered Wall of said channel to control the communi cation between said air space and passages when the valve is axially moved, said valve having engagement With said nozzles to cause an axial adjustment of the valve when the nozzles are relatively adjusted.

8. In a spray-head, an outer nozzle having an air space therein adapted to have communication with a source of air pressure supply and having supplemental air discharge passages from said space and a valve mounted Within said space for movements axially of the nozzle for controlling the discharge of air from said passages, said nozzle having a tapered sidewall coacting With the valve to permit greater or less volume of air to pass to the passages from said space when the valve is axially moved.

In testimony whereof I have hereunto signed my name to this specification.

JAMES E. PERRIN.

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