US1944920A - Pressure-cup for spray appliances - Google Patents

Description

Jan. 30, 1934. BR M 1,944,920

PRESSURE CUP FOR SPRAY APPLIANCES Filed Aug. 26, 1931 Iq van far.

Patented Jan. 30, 1934 STATES PRESSURE-CUP FOR SPRAY APILIANCES Svcnd Bramsen, Chicago, Ill., assignor to Binks Manufacturing Company, Chicago, 111., a corporation of Delaware Application August 26, 1931. Serial No. 559,449

5 Claims.

10 sheet metal, while permitting the use of a thicker walled upper receptacle portion; and which will enable these two receptacle portions to be easily assembled in rigid and hermetically sealed rela- Y tion to each other without the use of solder or e the like. In another aspect, my invention aims to provide a two-part receptacle construction of the above characteristics, which will enable the user to effect a rotation of the cover with respect to the receptacle without straining or loosening the joint between the two portions of the receptacleeven when a severe rotational strain is required for loosening or tightening the cover.

Furthermore, my invention aims to provide an expeditious and inexpensive method of manufacturing such containers.

When so called spray guns are used for spray jobs requiring only small total quantities of paint or other coating material-as for example, in touching up parts of a surface which have .been inadequately coated by a spray of liquid supplied from a distant tankit is customary to mount a so called touch-up spray gun directly on a liquid container which can be supported along with the spray gun by the hand of the user.

For this purpose, the ordinary types of sheet metal receptacle have been only partially satisfactory, because of the dificulty of securing the needed tight seal between the cover and the receptacle while still permitting this cover to be easily attached and detached. This objection has been all the more serious when the general arrangement of such a spray gun and paint container assembly also demands the providing of a number of passages in the cover for the air and the liquid coating material, and when a part of the spray gun affords a leverage for exerting strong rotational strains on the container during the attaching or detaching of the cover.

' To reduce the seriousness of these objections, it has heretofore been customary to employ receptacles made of glass. But the glass receptacle for this purpose needs to have a rather thick wall to avoid undue losses by breakage, thereby adding undesirably to the weight which the user must manipulate during the spraying operation. Moreover, the shrinkage of the glass during the cooling (after it is moulded) is irregular, so that it is more difiicult to secure the desired tight joint to a cover than it would be with die-cast metal for which the extent of shrinkage can be much more exactly controlled. On the other hand, a receptacle made of a single die casting would be far too heavy to be suited for the above mentioned purpose.

With these limitations in mind, my present invention aims to provide a relatively cheap, strong and light screw-cap container in which both the cover and the upper portion of the receptacle can be accurately moulded die-castings, in which a cup-shaped drawn body of thin metal can readily be attached and sealed to the lower end of this upper receptacle portion, and in which this upper portion is also designed so that the rotational strain during the attaching and detaching of the cover will not fall on the said cupshaped drawn body portion.

Still further and also more detailed objects oi my invention will appear from the following specification and from the accompanying drawing, in which Fig. l is a central and vertical section through a pressure-cup type of paint container embodying my invention, including portions of a spray gun mounted on this container, parts of the spray gun being shown in side elevation.

Fig. 2 is a side elevation of approximately the upper half of the receptacle of the container, as it appears when the cover is detached.

Fig. 3 is an enlarged vertical section taken diametrically of the said receptacle through one side of the latter, along the line 33 of Fig. 2, showing the joint between the cup-shaped drawn metal bottom section of the receptacle and the cast metal upper section.

Figs. 4 and 5 are fragmentary sections similar to Fig. 3, showing two consecutive positions of adjacent portions of the two receptacle sections during their assembly.

In the illustrated embodiment, the cover is of cast metal and comprises a cover top 8 having an upright and central paint supply duct integral with it, and also having an integral and interiorly threaded flange 13 depending from its outer edge, the said duct including a portion 9 extending upwardly from the cover and a downwardly extending portion 10. Coupled to the lower end of the duct portion 10 is a liquid inlet pipe 11 which reaches to the lower portion of the interior of the hereafter described. receptacle section of the container. The cover also has integral with it a radially projecting arm 5, shown as integral with the handle 6 of a spray-gun which has the usual valve-operating trigger '7 depending in front of this handle.

The threads 14 of the cover flange 13 interflt with threads 20 on the neck 19 of th cast upper section of the receptacle, which section has a downwardly flaring portion 17 below the said neck and an interiorly cylindrical skirt 22 depending from the lower end of the said flaring portion. The skirt 22 has adjacent to its juncture with the said flaring portion an exterior ribbing or knurling 23; and the part of the skirt below this knurled portion is formed (as shown in Fig. 3) to present a lower end portion having a downwardly and inwardly tapering frustroconical exterior surface 26, the part between this surface 26 and the knurling 23 being contracted in diameter to form a peripheral groove which presents an upwardly facing annular shoulder 29 at the top of the tapering surface 28, the bottom of which groove is a thin cylindrical skirt portion 28 extending upwardly from this shoulder.

The bottom section of the receptacle, which preferably is drawn from sheet aluminum (or from a light alloy in sheet form) is in the form of cup having a bottom 24, which desirably is bowed upward in section, and a tubular riser wall 25, which riser wall desirably has the bore of all except its upper portion of a diameter closely approaching (but not larger than) the eX- terior diameter of the extreme lower end of the skirt on the cast upper receptacle section.

The mouth end portion 27 of the cup-like bottom section is initially flared out in irustro-conical fashion with the taper of its bore at a smaller angle than that of the exterior lower skirt surface 26 of the upper receptacle section, and with the bore of the flaring receptacle portion somewhat smaller in diameter at its upper end than the outside diameter of the cast skirt at the level of the annular horizontal shoulder 29.

With the receptacle sections thus proportioned, the tapering lower end of the cast skirt will enter the flaring sheet metal mouth portion 2'? only for part of the length of the latter when the skirt is slipped into the mouth of the sheet metal cup, as shown in Fig. 4, thereby presenting the said annular shoulder 29 considerably above the mouth end of the cup. After the cast receptacle portion has thus been set manually into this cup mouth, the cast upper section is pressed downwardly to such an extent as to present the mouth end of the cup portion somewhat above the said annular shoulder 29, (as shown in Fig. 5), during which pressing the flaring mouth portion 2'? of the cup is expanded so that its taper conforms to that of the exterior lower skirt end portion 26.

Then, while the two receptacle sections are held in the relative positions shown in Fig. 5, the part of the cup riser wall which projects above the said shoulder 29 on the cast receptacle portion is spun radially inward of the receptacle to form an inturned flange 30 overhanging the said shoulder, as shown in Figs. 1 and 5. Since the expanding of the flaring cup wall portion 27 is effected by the skirt portion which this wall portion is to house, these receptacle parts then conform snugly to each other, so as to afford a tight seal, and the sealing is further augmented by the inturned flange 30 which also prevents any possible vertical slipping or sliding of the lower sheet metal cup section with respect to the cast metal upper section. Indeed, the joint which can readily be secured in this manner (without the use of solder, cement or other auxiliary sealing means) is so tight that the resulting container readily withstands high differences in pressure between its interior and its exterior, since the resiliency of the sheet metal of the lower section continually tends to contract the flaring portion 27 in diameter.

This firm and tightly sealing gripping of the cast skirt by the cover also will resist manual eiforts at rotating the cast receptacle section with respect to the sheet metal cup section by directly grasping one of these parts with each hand. However, if the liquid contents of the container include sticky portions, these may tend to gather at the threaded connection of the cover to the neck of the receptacle, particularly if the container has been tipped or upset and in case the usual gasket 15 between the cover top and mouth end of the receptacle has deteriorated.

When this has happened and the user presses against the spray gun handle 6 to secure an added leverage for unscrewing the cover, the above described seal between the two receptacle portions might be loosened if the sheet metal cup portion was the receptacle part which the user gripped while unscrewing the cover, thereby causing a leakage of compressed air and possibly also a spilling of liquid.

To guard against this, I provide the cast receptacle section with none-slip surface formations, such as a vertical ribbing or knurling 23 of adequate depth and vertical height to make this much more easily gripped than the metal cup part. I also desirably have the exterior diameter of this knurled portion larger than that or" the riser wall 25 of the cup-as shown by the dotted line 32 in Fig. 2so that no portion of the hand of the user will be apt to bear against this cup wall 25 when this hand grips the knurled projecting ring of the container. Such a knurled or other non-slip bead formation can easily be provided by thickening the corresponding part of the cast upper section, while still providing the skirt of this section with a simple cylindrical bore closely approximating the bore of the riser wall 25 of the cup-like bottom section, thereby providing a general smooth interior for the entire receptacle.

As the result of the above described provisions, even an inexperienced and clumsy user can screw the cover upon the receptacle with ample firmness for compressing the sealing gasket 15, and likewise can unscrew the cover, without straining the connection between the two sections of the receptacle or affecting the tightness of the seal between these sections.

At the same time, the lightness of the meta which can be used for all container sections (particularly when the cup section is of aluminum, while the cast part and the cover are both die castings of an aluminum alloy) allows me to secure these advantages without making the assembly so heavy as to the the user. Sov also, since the needed paint duct, handle and other parts required for various constructions of so called paint-cup spray outfits can be die-cast integral with the cover; and, since accurately fi ting threads can be cheaply secured in die castings, my container construction also lends to low costs of manufacture.

However, while I have heretofore described my invention in an embodiment having spray gun parts integral with the cover, I do not wish to be limited to such a combination or to the puritself pose for which my container is employed. 'Nor do I wish to be limited to the details of construction, arrangement and manufacture above disclosed, since many changes might obviously be made without departing either from the spirit of my invention or from the appended claims.

I claim as my invention:

1. A receptacle of the class described, comprising an upper tubular section the lower portion of which has a downwardly and inwardly tapering frustro-conical outer face, the said upper section also having an upwardly flaring annular shoulder extending radially inward from the upper end of the said tapering face; and a cuplike bottom section having a flaring mouth portion in gripping and in tight fitting relation to the said tapering face portion of the upper section, the extreme upper end of the said mouth portion of the bottom section being turned inwardly to form an annular flange overhanging and engaging the said shoulder.

2. A receptacle of the class described, consisting of a single-piece upper tubular section the lower portion of which has a downwardly and inwardly tapering frustro-conical outer face, the upper section also having an annular groove above and adjacent to the upper end of the said tapering face; and a single-piece cup-like bottom section having its extreme upper end turned inwardly to present a flange entering the said groove, and having adjacent to the said flange a flaring portion tightly gripping the said tapering face of the upper section.

3. A receptacle of the class described, comprising a tubular upper section the lower portion of which has a downwardly and inwardly tapering frustro-conical outer face, the upper section also having an annular groove above and adjacent to the upper end of the said tapering face; and a single-piece cup-like bottom section having its extreme upper end turned inwardly to present a flange entering the said groove, and having adjacent to the said flange a flaring portion tightly gripping the said tapering face of the upper section; the upper section having an exteriorly knurled annular bead above and adjacent to the said groove and of larger exterior diameter than the upper portion of the bottom section.

4. In a container of the class described, a receptacle comprising an upper tubular section having a downwardly and inwardly tapering outer face portion at its lower edge portion, and a cuplike bottom section formed with an outwardly flaring upper portion tightly gripping the said tapering face portion of the upper section to provide a hermetically sealed joint between the two sections; the upper section being of rigid material, the bottom section being of relatively thinner and resilient material, and the said outwardly flaring portion of the bottom section being under radial tension; the upper section having a peripheral groove adjacent to the upper end of its said tapering portion, and the bottom section having at its upper end an inwardly directed flange extending into the said groove and engaging the lower wall of the groove.

5. A receptacle of the class described, comprising as its sole constituents a single-piece upper section of rigid material including a skirt having intermediate its height a generally cylindrical and vertically ribbed portion of greater exterior diameter than other parts of the skirt, the lower end of the skirt having a downwardly and inwardly tapered outer face, and the skirt having an upwardly facing annular shoulder at the top of said tapered face; anda cup-like bottom section formed of resilient sheet metal and having an upwardly flaring mouth portion housing and gripping the tapered face of the top section by radial tension, the bottom section having its extreme upper portion overhanging and engaging the said shoulder, the said flaring mouth portion of the bottom section being of smaller exterior diameter than the ribbed portion of the skirt of the upper section, so as to permit a tight grasping of the said ribbed portion by the hand of a user without having the said hand engage the said mouth portion of the bottom section.

SVEND BRAMSEN.

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