US1691097A - Spraying apparatus - Google Patents

Description

N0v.`13, 192s.

G. c. WATERS, JR

SPRAYING APPARATUS Filed April 8, 1927 Patented Nov. 13, 1928.

GiLBERT o. WATERS,

PAT-,ENT cleric.is. i

n., or aoCHEs'rEp, YORK, essleNoR To Tiri: E. C. BROWN COMPANY, F menester; NWYOR! eeelieriir 0i NEW roast SPRAYKING APPAMTUS.

Application sied A- pfu s,

The present invention relatesto spraying apparatus in which a pump is `projected into a liquid holding reservoir or container vfor use in building up pressure therein for eject- `ing the liquid therefrom in the form ofa ,Sprayand has for oneobject yto provide an improved apparatus of this class which will be comp aratively inexpensive to manufacture, convenient to operate and efficient in service. Aurther object of the invent-ion is to provide an improved spraying device embodying a liquid holding reservoir and pump therein so constructed as to avoid unseating voi the check valve betweenthe pump and reservoir after completion ot the pumping operations', a condition heretofore arising due to the counter pressure of the air between the piston and valve upon extending the piston beyond its normal pumping stroke.

To these and other ends'the invention resides in certain improvements and combinations of parts; all as will hereinafter more Vitully describech the novelV vvfeatures being pointedou't in Kthe claimsat the end ofthe specification.V

In the drawings Figurelis a sidevieivoi a spraying apparatus embodying one form ofthe invention; i Figure 2v is an enlarged fragmentary sec tion showing the container pump cylinder therein;V A Y Figure 8 is a fragmentary section through the lower end otthepump showing the piston at theinner end otitspumping'stroke;

Figure 4 is an enlarged horizontal section taken Von line dft-Poil FigureQi and Figure is a. section taken online a-a of s Figure 2.

Similar reference numerals throughout the several views indicate the same parts.

The present invention contemplates im# V proved means* for overcoming certain objiectionable veatures heretofore experienced With apparatus ot the present type wherein it has been found thatiliquid from the container Will leal( into the pump cylinder and 4 spread to the outside of the container when the apparatus is set aside or not in use, due l to unseating of the check valve Abetween the container and pump by the counter pressure of air trapped in the lower end .of the eylin! der when the piston is moved to Vits lowest or extended position. i

l kReterring to-thefdravvings, the reservoir or container for the liquid tov be sprayed is 1927. serial No. 182,087,

indicated 10 and is provided with a nipple or threaded portion 11 With which is to be connected the outlet pipe or conduit and noz- Zle not shownl Which may be `of any Well Y known type. i `The topor end Wall 12 of the container is provided with an upstanding lthreaded collar 13 secured tothe container in any desiredmanner. The pump cylinder liis projected within thecontainer through vsaidcollar and is provided with an annular shoulder 15 which is supported by the collar through the medium ofa gasket 16. Fitting over and closing the outer end of the pump cylinder is a cap or closure 17 which is threaded upon the collar and screwed downto clamp the cylinder in position thereon. The cap is provided with an aperture 18 through which is adapted to reciprocate a piston rod 19 which is suitably connected with the pump piston 2O disposed Within the cylinder. 1 The rod projects through the vcap and Ahas an extended portion 21 terminating ina suitable handle 22. It will be understood thatthe portions 119 and 21 of the vrod may be constructed asone member if preferred, valthough they are shown inthe present instance `as`- 'adapted to'project through a pair of opp@ sitely arranged key hole slots in the cap 17. The lugs are adapted to be passed bodily through the enlarged port-ions of the slots and are arrangedfto interloeltivith the cap when rotated into the narroiv portions ot'said slots by the turning ot' the rod, the locking .position of the parts being indicatedin Figures 2 and 4. Thus the rod and piston are made adjustablebv rotation from the locking position shown in Figure el to a posit-ion in which the lugs 24 are shifted into registry with the enlarged portions of theareuate slots 25 oi thefcap 17." In the last named position the rod is free to be moved longitudinally ofthe cylinderl to permitwithdrawal of the lugs from said slots, after Which 'thevrod'niayybe rotatedto any positiondesired in which the lugs will, upon reciprocation of the rod. co- Y operate with the cvlinder cap to limit the in- Ward kstroke .ot the piston to the position shown in Figure 3 during the pumping opwith a reduced extension 26 havingan airv discharge passage 27 controlled bya check valve 2S which may be of any suitable type,

-ni'cferabl a ball valvev as shown whichr is normallyy held in Clos-ed positionby rthe pressure of the 'liquid in the container ybut which may also be spring closed if desired.` rlhe valve is limited in itsoutward or opening movement by any suitable means such as the open-ended nut '2 threaded Kupon' the cylf inder extension 26 as shown in- Figure 3.

. Ordinarily in a pump of this kind, after building up pressure in the container by l pumping air therein, a certain amount'of air is trapped between the piston and che-ck valve when the pumping opera-tions are completed and t-hel piston is moved to its extended position as shown in Figure 2', in winch it is locked by cooperation ofthe lugs 2d with the cap 17.. The counter-pressure of the trapped air under these ciroun'istances will, for a lim-k ited period of time at least, causes tl e valve to unseat and in some cases fluttering of the valve may takeplace which is of course, objectionable. The opening ofthe valve by the trappedair permits a certain amount of the liquid to lnd its way past the pistonintor the cylinder fromwhence it escapesthrough valve into the container.

` pass,

the cylinder head to the outside of the'container where it spreads over the latter, which is of course objectionable as will be understood.: To odset this objection-I provide a by-pass 30 adjacent the inner Vend of the cylinder at a point opposite the piston when the latter is in the extended locking position shown in Figure .2.k Normally, duringthe pumping operations the 'lugs' 2li,through engagement with the outer face of the closure 17,serve to limit the stroke of the piston so that it is not projected to a point oppositek the by-pass Therefore the air compressed by the piston is forced through the Vcheck However, when the piston is extended to a point opposite the bythe trapped air is allowed to escape through the latter so that the valve is held seated by the pressure of the liqui-dwithin the container, or if preferred, by a light spring notv shown which may be utilizedin addition to the pressure of the liquid.

The by-pass is preferably provided by striking outwardly'ja portion of the wall of the` cylinder at the desired point as indicated at j 3l in Figures 3 and but 'may be otherwiseV formed if preferred. l l l While I prefer `toprovide. locking means for the piston and its operating rod as described above, it will be apparent that the co-.

operating means between the rod and cylinder which limits the stroke of the piston may not necessarily be in the form of a locking device since, after relieving the trapped pressure in the bottom of the cylinder, the principal object in providing the locking means `k j is to prevent the piston and rod from being accidentally displacedl as might happen, for example, should vthe container be inverted or turned upside down.

I claim'fas my invention:

n l. In an apparatus of the class described, the combination of a liquid holding container, a pump `extendingtherein for pumping air thereto vcomprising a piston and a cylinder for the same having a valve adapted to check the flow of liquid from thecontainer .to the cylinder., operating means for cylinder to limit inward movement of the piston to a predetermined point during the pumping operations and beingadjustable to permit the piston to have an extended movement inwardly of said point and ahy-pass for relieving the pressure of air trapped within the cylinder as a result of said extended movement. j Y

2. In `an apparatus of the class'described, the combination of a liquid holding container, a pump extending therein for pumping air thereto, said Lpump comprising a piston and a cylinder therefor having a valve fork checking the flow of liquid from the tank to the cylinder, an adjustable operating rod for the piston projecting through the outer end wall of the cylinder, means upon the rod adapted in one position of adjustment thereof to engage said wall whereby to limit inward ymovement ofthe piston and adapted in an extended position of the piston to project through said wall for locking engagement with thev inner face thereof and a by-pass forrelieving. pressure in the cylinlderjwhenthe piston is moved to said extended f position.

3. In a spraying device, the combination of a reservoir adapted to containa liquid, a pump cylinder extending into the reservoir, a piston and piston rod adjustable to relatively `different positions withinthe cylinder, means upon the rod adapted forcooperation with the cylinder in one adjusted position to ,limit the stroke of the piston and in another to permit` the piston to have an, extended movementbeyond the pumping stroke,r a bypass for relieving the pressure yof air trapped within the cylinder as a result of said ex-4 tended movement and a' check valve at the dischargev end of the cylinder.v

4. In a spraying device, the combination of a reservoir adapted to contain a liquid, a pump cylinder extending into the reservoir and having a piston therein, a piston rod and handle thereon-for operating the piston. a check valve adjacent the discharge end of the cylinder, means for limiting the' pumping the piston ,arranged to cooperate with-the stroke of the piston including lockingimeans for the latter dependentupon an extended l'novement of the piston beyond the pumping stroke and a hy-pasSfor relieving the pressure of air trapped Within the cylinder as a. result of the extended movement of the piston therein.

5. In a spraying device, the combination of a liquid holding container, a pump extending therein for pumping air thereto comprising a piston and a Cylinder for the same having a valve adapted to Cheek the flow ol liquid from the container to the cylinder, operating means for the piston and a bypass adjacent the inner end of the cylinder for relieving the pressure therein When the piston is moved to a point opposite said lay-pass.

GILBERT C. VATERS, JR.

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