US3006560A

US3006560A - Spray gun

Info

Publication number: US3006560A
Application number: US773921A
Authority: US
Inventors: Rosenkranz Jules
Original assignee: LAFAYETTE BRASS Mfg CO Inc
Current assignee: LAFAYETTE BRASS Mfg CO Inc
Priority date: 1958-11-14
Filing date: 1958-11-14
Publication date: 1961-10-31
Anticipated expiration: 1978-10-31

Description

Oct. 31, 1961 J. Rosr-:NKRANZ SPRAY GUN 2 Sheets-Sheet 1 Filed NOV. 14, 1958 W l N v E N To R Jalfs asf/11112 ATTORNEYS Oct. 31, 1 961 J. RosENKRANz SPRAY GUN 2 Sheets-Sheet 2 Filed NOV. 14, 1958 ATTORNEYS United States Patent C) 3,006,560 SPRAY GUN Jules Rosenkranz, New York, N.Y., assigner to Lafayette Brass Mig. Co., Inc., a corporation of New York Filed Nov. 14, 1958, Ser. No. 773,921 1 Claim. (Cl. 239-456) This invention relates to the art of spray guns, more particularly of the adjustable type.

It is among the objects of the invention to provide a spray gun which may readily be fabricated at relatively low cost and has but few parts which are not likely to become deranged even after long use and which may readily be operated to provide a spray of desired characteristics and as readily shut oi.

According to the invention these objects are accomplished by the arrangement and combination of elements hereinafter described and more particularly recited in the claims.

In the accompanying drawings in which is shown one or more of various possible embodiments of the several features of the invention,

FIG. l is a side elevational View of the spray gun,

FIG. 2 is a front elevational view thereof,

FIG. 3 is an enlarged sectional view taken along line 3 3 of FIG. 2,

FIG. 4 is a sectional view taken along line 4 4 of FIG. 3,

FIG. 5 is a sectional view taken along line 5 5 of FIG. 3,

FIG. 6 is a sectional view taken along line 6 6 of FIG. 3,

FIG. 7 is a sectional View taken along line 7 7 of FIG. 3, and

FIG. 8 is an enlarged sectional view taken along line 8 8 of FIG. 3.

Referring now to the drawings, the spray gun is generally in the fonn of a pistol and has a barrel 11 and a hand grip 12 depending from one end thereof.

The barrel 11 has a bore 13 extending longitudinally therethrough which is of reduced diameter at its nose end 14 as at 15 dening an annular shoulder 16 on which an annular gasket 17 is seated, the extremity of said bore 13 between the outer end of said reduced diameter portion and the nose end 14 of the barrel 11 tapering outwardly as at 18. The rear end 19 of barrel 11 is of enlarged diameter as at 20 to dene an annular shoulder 21 on which is seated a metal washer 22, the latter supporting an annular gasket 23. The washer 22 and gasket 23 are securely retained in position by means of a threaded plug 24 screwed into the correspondingly threaded end 25 of said bore 13.

Slidably mounted in said bore 13 is an elongated stem 31 of reduced diameter at its nose end as at 32. The outer extremity of said reduced diameter portion 32 is outwardly tapered as at 33, said reduced diameter portion 32 normally extending through gasket 17 and the reduced portion 15 of bore 13 and the rear end of the stem extends through an axial bore 26 in plug 24. The stem adjacent its rear end is encompassed by an O-ring 27 seated in an annular recess in plug 24, to prevent leakage through the bore 26.

Aixed to stem 31 at the root end of the reduced portion 32 is a ow control valve 34 which, as is clearly shown in FIG. 3, is a substantially cup-shaped member, the rim 35 of which is adapted to seat against gasket 17 to effect a seal.

Aiiixed to the stem 31 between its ends is a stop 36, illustratively a split ring coacting with an annular groove in the stem 31. Encompassing the stem 31 and compressed between stop 36 and the washer 22 retained 3,096,560 Patented Oct. 31, 1961 ice against shoulder 21, is a coil spring 37 which normally urges the stem outwardly and retains the rim 35 of the valve 34 against gasket 17.

Means are provided to supply a fluid such as water under pressure to the bore 13 of barrel 11.

T0 this end, the grip 12 of the spray gun is substantially hollow as at 38 and has a washer 39 secured therein near its outer end on which an annular gasket 41 is seated, the portion of the grip outwardly of said gasket being internally threaded as at 42 to receive the correspondingly threaded end of a hose tting for example.

The upper portion of the hollow grip 12 is divided into two chambers 43 by an internal -vertical partition 44, comprising two spaced walls 45 (FIG. 4) extending substantially parallel to the side walls of the grip 12 and depending from the rear end of barrel 11. The side edges 46 of the walls 45 are secured to and preferably formed integral with the front and

rear walls

47, 48 of the grip as shown in FIG. 6 and the lower ends 49 of the walls 45 are connected by a wall 51.

The rear end 52 of wall 51 is connected to the rear wall 48 of the grip as shown in FIG. 3 and the front end 53 of wall 48 is connected to the front wall 47 of the grip and has an extension 55 which protrudes forwardly from the grip and is curved upwardly to dene a trigger guard, the portions of each of the front and rear walls of the grip 11 aligned with the space between the walls 45 having a

vertical slot

56, 57.

With the construction thus far described, the partition 44 defines a guide for a trigger assembly to be hereinafter described, and the interior of such partition 44 is completely isolated from the water in the hollow grip which may flow into the barrel through ports 61 therethrough in communication with chamber 43.

As shown in FIG. 3, the trigger assembly comprises a plate 62, the lower edge 63 of which rides on the wall 51 and the protruding portion 55 thereof. The front edge 64 of the plate has a concavity to simulate a trigger, and a projection 65 extending longitudinally from the upper edge of the front of the plate 62 rides in the bore 66 of a sleeve 67 desirably formed integral with the barrel 11 near its nose end and depending therefrom, the upper end of the curved portion of the strip 55 being connected to said sleeve.

Depending from the barrel 11 between the sleeve 67 and the grip 17 are parallel walls 68 (FIG. 8) which have transversely aligned vertical slots 69 through which extends a locking member 71. As shown in FIGS. 3, 6 and 8, the locking member comprises a rigid strip or detent, the ends of which extend beyond the associated walls and are bent at right angles as at 72. As shown in FIG. 8, the lower edge of the strip has a cutout 73 to provide clearance for the ratchet teeth 7-4 in the upper edge 75 of the plate 62, the strip being urged toward the upper edge 75 of the plate by means of a leaf spring 76 for example.

Means are provided to actuate the stem 31 upon movement of the trigger 62. To this end, as shown in FIG. 3, the rear end of the stem which protrudes beyond the plug 24 is externally threaded as at 77, and is engaged by the correspondingly threaded bore of a sleeve 78 which is secured to a knob 79. The sleeve 78 is rotatably mounted in a nger S1 rising from a member 82 extending longitudinally of plate 62.

To set up the unit for operation, a water hose, for example, is connected to the threaded end of grip 11. Althrough the water under pressure will flow through the hollow grip and ports 61 into the barrel 11, as the valve member 34 at the end of the stern 31 is retained against the gasket 17 by the coil spring 37, no water will be discharged from the nose end of the barrel.

Assuming that the spray gun is in the position shown in FIG. 3, with the locking member 71 in ratchet position so that its loweredge is urged against the ratchet teeth 74, but with the threaded end 77 of the stem only half way screwed into the sleeve 78, the trigger 62 may be pulled a desired amount. As a result, the ratchet teeth will move past the locking member 71 and the finger 81 will pull the stem 31 against the tension of coil spring 37. The trigger 62 is pulled until the spray has the desired characteristics and then released. By reason of the tension of coil spring 37 which reacts against Ythe trigger plate 62, the ratchet teeth 74 thereof will be -urged against the strip 71, so that the trigger and hence the stern 31 will remain in desired position.

Thereupon if a ne adjustment of the spray is desired, it is merely necessary to rotate the knob 79 in either direction to effect slight inward or outward movement of the stem.

To shut off the spray, it is merely necessary to push the strip 71 to release position in which the notch 73 is aligned with the ratchet teeth 7-4 in the trigger plate. As a result, the coil spring will move the stem 31 outwardly so that the valve member 34 will seat on gasket 17 to cut orf further ow.

With the construction above described, a neat compact spray gun is provided which may readily be adjusted to aord a desired spray.

As many changes could be made in the above construction, and many apparently Widely diierent embodiments of this invention could be made without departing from the scope of the claim, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

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

A spray gun comprising a barrel having a longitudinal bore, a pistol Vgrip at one end of the barrel, said pistol grip having a recess therethrough extending parallel to the length thereof, said grip having an inlet port and a passageway leading into the barrel and isolated from said recess, a stern slidably mounted in said barrel bore and movable longitudinally thereof, a valve seat at the nose end of the barrel, a valve member carried by the stem, means resiliently reacting against said stem normally to urge the valve member against said seat, a trigger assembly operatively connected to said stern to actuate the latter, said trigger assembly comprising a plate slidable in said recess and conformed at its forward edge to simulate a trigger, a trigger guard extending from said pistol grip to said barrel, said plate having a longitudinal projection at the upper portion of its front and rear edge, said rear projection being operatively connected to said stem for actuation of the latter, means to guide the Vfront projection of said plate, said barrel having a pair of walls depending therefrom and straddling the upper edge of said plate, said upper edge having a plurality of ratchet teeth formed thereon, said walls having a pairV of transversely aligned slots, a detent extending through said slots and slidably mounted with respect to said ratchet teeth, said detent having a recess at its lower edge adapted to provide clearance for said ratchet teeth, means resiliently urging said detent against said teeth to retain the stem in actuated position, -means to eiect movement of the detent clear of said teeth for release of the trigger assembly and said stem, and means to effect movement of said stem independently of said trigger assembly.

References Cited in the ijle of this patent UNITED STATES PATENTS 454,640 Farmer June 23,1891 654,009 Kittinger et al July 17, 1900 928,682 Mikorey et al July 20, 1909 1,385,160 Stokes July 19, 1921 1,631,167 Tereau June 7, 1927 1,825,864 Harter Oct. 6, 1931 2,064,794 Klauminger Dec. 15, 1936 2,448,159 Spreng Aug. 31, 1948 2,657,098 Strahman Oct. 27, 1953y 2,852,310 Francis Sept. 16, 1958 FOREIGN PATENTS 318,034 Italy Junel, 1934