US2508597A - Spraying equipment - Google Patents

Description

May 23, 1950 W. P. DALRYMPLE 'SPRAYING EQUIPMENT 5 Sheets-Sheet 1 Filed July 19, 1946 IIIIA IIIIII INVENTOR. WILLIAM P. DALRYMPLE v ubrngys May 23, 1950 w. P. DALRYMPLE 2,508,597

SPRAYING EQUIPMENT 3 Sheets-Sheet 2 Filed July 19, 1946 WINNIE f5 INVENTOR. WILLIAM P. DALILYMPLE a l/lor'zw s May 23, 1950 w. P. DALRYMPLE 2,508,597

SPRAYING EQUIPMENT Filed July 19, 1946 3 Sheets-Sheet s INVENTOR. WILLIAM P. DALRYMPLE BY M/ eow, L74 Liorngys Patented May 23, 1950 UNITED STATES PATENT OFFICE SPRAYING EQUIPMENT William P. Dalrymple, Rochester, N, Y., assignor to American Brake Shoe Company, New York, N. Y., a corporation of Delaware Application July 19, 1946, Serial No. 684,727

4 Claims. 1

This invention pertains to spraying equipment and more particularly to means by which containers for material to be sprayed may be assembled in operative relation with spray guns and the like.

It has been customary in the art to which this invention pertains to mount spray guns such as are used, for example, in spraying paint and like coating materials, on the cover of a container for such coating material so that the spray gun and the container may be handled and manipulated as a unit. Containers of this type are necessarily small and require frequent refilling and they must be changed whenever another color or type of material is to be sprayed. Hence, for efificient operation it is essential that some means be provided for quickly and conveniently mounting the container on the spray gun or detaching it therefrom. At the same time it is necessary that a liquid-tight connection be maintained between the cover and the container and that air-tight connections be established and maintained in the supply line.

In the past various types of cam and spring arrangements have been employed to connect spray guns and containers of the type referred to above and some of these have had certain merit but so far as I am aware all have been deficient in certain respects. Some of them have been complicated in structure, some difficult to manipulate. and some have been unsatisfactory because of leakage, loose connections, or awkward arrangements of operating parts. Still others have been bulky and unwieldy whereas it is desirable that apparatus of the type under consideration be compact, light in weight, and assembled in such manner as to afford convenient access to all parts without having elements which interfere with the normal handling of the gun in spraying operations.

An object of the present invention, therefore, is to overcome all the deficiencies mentioned ove. by o rran ing the vari us parts f the assembly that the paint container and the spray gun are tightly and firmly connected by means of simple and compact elements which may be readily and quickly disconnected.

A further object of my invention is to reduce the number of parts required to assemble the container in working relation with the spray gun by combining in single elements functions which formerly required separate mechanical parts. Another object is to combine cam n s r n e ent n. such a m nner that a gh connection between the container and its coveris main- 2 tained constantly regardless of wear or deformation of certain sealing elements, the cam and spring elements being arranged so. as to provide firm attaching force or complete release of pressure for disassembly.

Still another object is to arrange means for manipulating locking cam elements so that such means will be readily accessible but will not project so as to interfere with the convenient handling of the equipment during spraying operations.

Other and further objects of the present invention will be apparent from the following description and claims are illustrated in the accompanying drawings which, by way of illustration, show preferred embodiments and. the principle thereof and what I now consider to be the best mode in which I have contemplated applying that principle. Other embodiments of the invention embodying the same or equivalent principle may be used and structural changes'may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings,

Fig. 1 is an elevational view of a container and connecting means for attaching such container to a spray gun;

Fig. 2 is a side view of the structure shown in Fig. 1;

Fig. 3 is an enlarged view of the structure 01 Figs. 1 and 2, on a somewhat larger scale, certain parts being shown in section;

Fig. 4 is a horizontal sectional view taken substantially on the line 44, Fig. 1;

Fig. 5 is an edge view of one of the cam elements which is employed in locking and releasing the assembly;

Fig. 6 is a bottom plan view of the cam element shown in Fig. 5, this view being taken on the line 6-6 of said figure;

Fig. 7 is a fragmentary elevational view or certain elements, parts being broken away and other parts being shown in section;

Fig. 8 is a vertical sectional View of the hollow sleeve or core member which serves to secure most of the other parts of my invention together;

Fig. 9 is a view similar to Fig. 1 showing a modification; and

Fig. 10 is a perspective view of the bail shown in Fig. 9.

Referring first to Fig. 1 there is illustrated an assembly omprisi g he elem n s of m invention by which a container may be secured deachab y to a p a p a at ch as a s ra These parts merge one into another and the upper cylindrical portion terminates in head or rim I5.

The cylindrical top portion [4 of the container is preferably provided with a pair of lugs I6 for attaching a carrying strap or bail member I'I. These lugs are secured to the cylindrical portion a rolled I4 at points diametrically opposite from each other and near the rolled bead or rim I5 by any 7 suitable means, such as rivets I8 having large heads inside the container wall and stems projecting through the studs. The lugs I6 are 'formed with projecting stud portions I9 which are adapted to be received in openings 2| in the ends of the bailmember I'I. As shown in Fig. 2, these openings may be hook'shaped to permit insertion of the studs Hi from the side edge of the bail but, if desired, they may be merely round holes." ZIn the latter case the bail is attached by springing its ends apart far enough to place them over the studs and subsequently allowing the ends to spring back toward each other so they will remain inen'gagement with the studs. The strap or bail member I! preferably'comprises a fiat metalstrip of suitable thickness having a rather wide horizontal middle portion 22, sloping and somewhat tapered shoulder porstions' 23, and narrower end portions 24 which extenddownwardly and substantially parallel to each other; The end portions '24 contain the openings 2| mentioned above. Attached to the underside of the wide middle portion of bail'I'I is an upper cam member 25 :which will be more 'fully described below. The member 25 comprises a flat plate or flange portion 26 which is secured rigidly to the bail member I! as byrivets 21 which extend through the horizontal middle portion 22 of the bail. The cam member 25 is provided centrally thereof with an'an'gu1ar,'for example hexagonal, opening 28 and the bail portion 22 is provided with a similar and aligned opening 29 for a purpose to -bedescribed presently.

For closing the container a lid or cover 3| is provided comprising a generally disc shaped plate having a; somewhat raised annular margin --32 terminating in a downturned flange or rim -33. "Adjacent the inner boundary of the raised marginal portion 32 a gasket retaining ring 34 is "secured to the bottom face of the cover. This :ring may be secured in any suitable manner, as by riveting or soldering"or welding. Ring 34 :has a plane in'ner portion in' contact with the cover and a downwardly sloping outer flange portion 35 which "cooperates with the downturned rim 33'to retain a resilient gasket 36 of rubber or like material. The exposed under face of the gasket is adapted to be pressed into sealing relation with the rolled rim I5 when the cover is in place on the container and when pressure is applied thereto by means to be described hereinbelow. V p,

The center of the cov er 3| is formed with a conical depression 3'! and an opening 38 at the l bottoin' of such depression'through whichattaching means for a spray gun are secured as will 4 be described hereinbelow. The cover is provided also with a raised embossure 39 disposed between the depressed portion 31 and the raised annular part 32. This embossure is provided with a small opening 40 to permit inlet of air to the container as its contents are drawn out by the spray gun.

A hollow sleeve 4| is provided for connecting the cover 3| and Various other parts of the assembly together and to a spray gun. This sleeve also serves as part of a conduit for the paint or other coating material. As best shown in Fig. 8 this sleeve is generally cylindrical in shape, but it has an enlarged hexagonal or other angular shaped portion 42 toward its upper end which is of a size and shape to fit freely and slidably in the openings 28 and 29 but to prevent rotation of the sleeve with respect to such openings. The lower part of the sleeve 4| is threaded externally, as at 43, to receive an upper nut 44 which rests in the conical depression 31 on the top face of the cover. Another nut 45 is provided for clamping the cover against the upper nut 44, thetwo nuts being provided with conical surfaces com- 'plementary to the surfaces of the conical depression 31. A third nut 46 is provided for clamping the upper end of a tube 41 against the lower end of the hollow sleeve 4|. The nut 46 is restricted at its lower portion, Fig. 3, and the upper :end of tube 41 is flared outwardly to be retained in nut 46 so that anefiective seal may be established and maintained between the tube and the sleeve; A tight connection is essential since the tube v4'! extends to the bottom, or very near the bottom of the container and draws the material to be sprayed by suction when the spray gun is operated.

'For a short distance below the angular portion 42 the sleeve 4| is of somewhat larger diameter than the lower portion thereof.

thereof which is adapted to engage the split ring 53. This nut is threaded internally as shown at 56 to receive a coupling member of a spray gun not shown. The split ring serves as an abutment so that tightening of the nut 54 may draw the coupling member of the spray gun into sealing relationship with the upper end of the sleeve 4|.

The upper part of the sleeve or housing 5|,

mentioned above, comprises a rotatable cam .member which is adapted to cooperate with the relatively fixed cam member 25 mentioned above.

This rotatable member comprises sloping cam surfaces 51 on its upper face which are adapted 'to cooperate with complementary cam surfaces 58 on the fixed cam 25. Rotation of the movable cam, and the housing 5| which is preferably integral therewith, in one direction causes the member 5| and associated parts to move downwardly with respect to the bail. Rotation in the other direction permits upward movement of member 5|. A lever 60 is provided for rotating the member 5| in either direction and it comprises a finger-piece preferably grooved as indicated at 60A to prevent slipping of the thumb or finger when the lever is operated.

The member 5| comprising the downwardly extending sleeve portion 6|, is enlarged internally to receive a spring 62 in the annular space between the sleeve 4| and the portion 6| The upper end of the spring is adapted to abut against the washer 5|] which is inserted in the enlarged sleeve portion 6| and which abuts against the shoulder 49 as mentioned above. When the parts are assembled, the lower end of spring 62 abuts against the upper surface of the nut 44. The spring 62 is rather strong and when the cam member 5| is rotated, as by lever 60, to force said cam member downwardly, the spring is compressed and applies considerable pressure to the lid or cover 3| through the intermediary of nut 44, thus compressing the gasket 36 into sealing relation with the rolled rim l5. When the cam is rotated to release position, the shoulder 49 limits upward movement of spring as but the spring is fully free when in the full release position so that the end portions or arms 24 of the bail I! may be readily detached from the studs l9, permitting separation of the cam and the spray gun from the container for refilling or replacement of the container.

From the foregoing it will be apparent that the parts are so arranged that by engagement of bail member I! with lugs I9 and subsequent rotation of the lever 60 the container cover and spray gun may be quickly connected to a container filled with paint or the like. Containers may be quickly removed and exchanged or refilled and reconnected by releasing the cam and disconnecting the bail.

Referring to Fig. 4, when the lever 6|] is in the locking position, indicated in this figure as the full line position, it underlies the bail H and is out of the way. It does not project in any manner so as to interfere with the operation of the spray gun which would be secured above the bail and directed to the right as the parts are shown in this figure. By the use of the thumb or finger the operator may rotate the lever 60 counterclockwise to the dotted line position of Fig. 4 when it is desired to releasev the gun and cover from the container. This operation unloads the compressed spring 62 and makes disconnection of the bail from the studs l9 simple and easy. If desired, appropriate stop means, not shown, may be provided on the lid or on thebail to limit rotation of the lever 60 between the two positions shown in Fig. 4. Also, the cam elements are preferably so formed that in either position there is a tendency for the parts to remain in place. This condition may be obtained by so designing the cooperating cam faces that the parts in contact in the full closed or release positions are either perfectly fiat and perpendicular to the axis of the sleeve 4 I, or are formed with slight convex and concave mating surfaces which tend, under the influence of the spring 62, to retain their set positions. This construction prevents the parts from moving out of closed position, for example, under the influence of the spring 62.

Assuming that it has become necessary to replace a container on the spray gun, the lever 60 is rotated to the release position shown in dotted lines in Fig. 4 thus removing the compression load on spring 62. As shown in Fig. 7, this operation completely frees the cover from engagement with the rolled edge |5 of the container rim, and the bail member H can be easily unhooked from engagement with the studs l9. After the container is refilled or exchanged the openings 2| of the bail H are engaged on studs l9 and the rotatable cam member 5| is turned to the locking position, shown in full lines, Fig. 4. This places the spring 62 under full compression and moves the sleeve 4| which carries the cover 3| downwardly with respect to the bail Cover 3| is thereby tightly pressed against the rolled rim 5 of the container, the gasket 3% being compressed sufiiciently to provide an effective seal. The air vent 4|! permits escape of air during such compression. Whether the gasket is new or is worn and indented, the action of spring 62 is such as to establish and maintain a tight connection between the cover and the container, thus preventing leakage. The vent 4 is so small that leakage therethrough would not be substantial even if the container should be tipped or inverted. This vent is nevertheless essential to the proper functioning of the spray gun since coating material is forced into the gun by atmospheric pressure due to the establishment of a partial vacuum by aspiration at the gun nozzle, as is well understood in the art.

It will be apparent that my invention comprises a compact and handy assembly for connecting containers to spray guns, a number of parts which were used in prior art assemblies having been eliminated. It will be noted that the cam elements 25 and 5| are utilized to place a strong compression load on the spring 62 for maintaining connections and sealing pressure.

The upper nut 54 which secures the assembly to the spray gun serves to prevent the sleeve 4| from sliding out of the bail I! when the parts are disconnected from the container. If desired, however, the nut 54 may be removed from the sleeve 4| by picking the split washer 53 out of groove 52. This can be done by removing or partly removing the three lower nuts 44, 45 and 46 from sleeve 4! and sliding the sleeve 4| upwardly through nut 54 until the split washer 53 is exposed above the upper surface of the nut 54.

In Figs. 9 and 10 I have shown a modification wherein the cam element 25 of Figs. 5 and 6 is eliminated by forming cam elements in the bail. The modified bail is shown at HA and it comprises a central horizontal part 22A, sloping shoulders 23A, and downturned terminal portions 24A provided with hook elements 2|A, substantially identical with parts 2|, 22, 23 and 24 of the first form described above in connection with Figs. 1, 2 and 3.

The central horizontal portion 22A is provided with an angular opening, preferably but not necessarily hexagonal as shown in the drawings, as indicated at 28A. This performs the same function as the angular openings 28 and 29 in the bail and cam members and 25 as described above and shown in Figs. 6 and 7, the opening being designed to receive the angular portion 42 of the sleeve member 4| and permit free axial movement thereof while constraining it against rotation.

The metal of the bail member HA is upset around opening 23A to form cam elements 58A which are identical in purpose and similar in surface contour to the cam surfaces 58 of Figs. 5 and 6. The cam elements 58A are formed in any suitable manner, preferably by pressing or forging, terminal portions 55A being out free from the horizontal portions 24A of the bail to provide the necessary displacement.

As will be obvious, the cam elements 58A cooperate with the cam surfaces 5'? carried by the rotatable lever 66 in the same manner as cam elements 55 of the stationary cam member 25, Figs. 5 and 6. The modification just described eliminates the cam member 25 and thus simplifies the construction to that extent. The bail member HA and the sleeve member 4|, may, if desired be made slightly short'erthan the modifica non of Figs. [1It'o 8 when the form shown in Figs. 9 and 10 is employed. For some purposes the lat 'ter construction is preferred as it replaces what is normally a cast cam element with a forged portion of-the bail which is preferably'of steel or like strong and durable material.

Thus, while I have illustrated and described the preferred embodiments of my invention, it

ing a longitudinal passage therethrough and having an externally threaded lower end portion and having anQannular retaining groove in its external surface near its upper end, said stem also'having an enlarged head portion of polygonal external cross section thereon spaced downwardly from said groove and having a downwardly facing shoulder spaced downwardly from said head portion, a paint cup cover having a central opening through which said screw threaded lower portion of said stem is extended, upper and lower clamping nuts threaded on said screw threaded portion and engaging upper and lower faces of said cover to clamp the same in 7 position on said stem, a coiled compression spring surrounding said stem above said upper nut and having its lower end engaging said upper nut, an operating member including a hub rotatively surroundingsaid stem and said spring below said polygonal head and having an inwardly extending flange with a lower face engaging the upper end of said spring and an upper face disposed for abutment with said downwardly facing shoulder to limit upward movement of said hub, said operating member having an actuating handle extended radially from said lhub, a generally U-shaped attaching bail havingdownwardly extending anchoring arms and a transverse top bar element, a cam element rigidly related to said top element and projecting downwardly therefrom, said top element being apertured to slidably receive said polygonal head portion of said stem, and one of said elements having surfaces for engagement with said head to hold said bail against rotation relative to said stem, an upper attaching nut rotatably disposed on said upper end of said'stem and having an internal retaining ring engaging said groove to hold said upper attaching nut against upward displacement on said stem, and cam follower means on said hub of said operating member operable upon rotation of said hub in a cover mounting operation to force said external cross sectional form, a paint cup cover l havingia central opening through which said on said screw threaded portion and engaging upper and lower faces of said cover to clamp the same in position on said stem, a coiled compression spring surrounding said stem above said upper clamping nut and having its lower end engaging said upper nut; an operating member including a hub rotatively surrounding said stem below said polygonal head and having a downwardly facing shoulder engaging the upperend of said spring, said operating member having a handle extended radially from said hub, a generally U-shaped attaching bail having downwardly extending anchoring arms and a transverse top bar element, a cam element rigidly related to said top element and projecting downwardly therefrom, said top element being apertured to slid-ably receive said polygonal head portion of said stem, and one of said elements having surfaces for engagement with said headto hold said bail against rotation relative to said stem, an upper attaching nut rotatably disposed'on said upper end of said stem and having an internal retaining ring engaging said groove to hold said upper attaching nut against upward displacement on said stem, and cam follower means on said hub of said operating member operable upon rotation of said hub in a cover mounting operation to compress said spring against said upper clamping nut while pressing said bail upwardly toward said upper attaching nut.

3. In a detachablepaint cup cover mechanism for use with apparatus for spraying paint and like materials, an elongated mounting stem having a longitudinal passage therethrough and having an externally threaded lower end portion and having an annular retaining groove in its external surface near its upper end, said stem also having an enlarged head portion thereon spaced downwardly from said groove and of polygonal external cross sectional form, a paint cup cover having a central opening through which said screw threaded lower portion of said stem is extended, means including at least one nut on said lower screw threaded portion and securing said cover in a fixed longitudinal position on said stem, a ,coiled compression spring surrounding said stem above said cover and operatively related at its lower end to said cover for applying downward force to said cover, an operating member including a hub rotatatively surrounding said stem below said polygonal head and having a downwardly facing shoulder engaging the up per end of said springsaid operating member having a handle extended radially from said hub, a generally U-shaped attaching bail having downwardly extending'anchoring arms and a transverse top bar element, said top element having an aperture therein complemental to said head to slidably receive said polygonal head portion of said stem to hold 'said bail against rotation relative to said stem, an upper attaching nut rotatably disposed on said upper end of said stem and having'an internal retaining ring engaging said groove to hold said upper attaching nut against upward displacement on said stem, and cooperating cam means on said hub and said top portion operable upon rotation of said hub in a cover mounting operation to compress said spring against'said upper'clamping nut while pressing said bail upwardly toward said upper attaching nut.

V 4.In a detachable paint cup cover mechanism for use with apparatus for spraying paint and like materials, an elongated mounting stem having a longitudinal passage therethrough and having an externally threaded lower end portion and having an enlarged head portion thereon spaced downwardly from said upper end and of polygonal external cross sectional form, a paint cup cover having a central opening through which said screw threaded lower portion of said stem is extended, upper and lower clamping nuts threaded on said screw threaded portion and engaging upper and lower faces of said cover to clamp the same in position on said stem, a coiled compression spring surrounding said stem above said upper nut and having its lower end engaging said upper nut, an operating member including a hub rotatatively surrounding said stem below said polygonal head and having a downwardly facing shoulder engaging the upper end of said spring, said operating member having a handle extended radially from said hub, a generally U-shaped attaching bail having downwardly extending anchoring arms and a transverse top bar element, a, cam element rigidly related to said top element and projecting downwardly therefrom, said top element being apertured to slidably receive said polygonal head portion of said stem, and one of said elements having surfaces for engagement with said head to hold said bail against rotation relative to said stem, an upper attaching nut secured on said upper end of said stem so as to be held against upward displacement on said stem, and cam follower means on said hub of said operating member operable upon rotation of said hub in a cover mounting operation to compress said spring against said upper clamping nut while pressing said bail upwardly toward said upper attaching nut.

WILLIAM P. DALRYMPLE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 16,960 Hersleb May 15, 1928 261,808 Carlton July 25, 1882 1,109,828 Goff Sept. 8, 1914 2,178,964 Hulse Nov. 7, 1939 FOREIGN PATENTS Number Country Date 306,830 Great Britain Feb. 25, 1929

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