US2281142A - Portable pumping apparatus - Google Patents

Description

April 28, 1942. w, b v s PORTABLE PUMPING APPARATUS Filed Aug. 9, 1939 4 Sheets-Sheet 1 A ia 2a, 1942. P g, w 'bAw 2,281,142

PORTABLE PUMPING APPARATUS Filed Aug. 9, 1939 4 Sheets-Sheet 2 April 1942. vrs. w. DAVIS PORTABLE PUMPING APPARATUS Figed Aug. 9, 1939 4 Sheets-Sheet 3 I: d g 5 Q 2 \Z\ #2 I 6 2 m4 2 mi j 2 v.2: a {Q WEN Z M Q a 9 a W 5 2% 1 J m mw w w fl a W. .M

PORTABLE PUMPING APPARATUS 4 Sheets-Sheet 4 Filed Aug. 9, 1959 @7665? Jazz Patented Apr. 28, 1942 3 UNITED STATES PATENT OFFICE PORTABLE PUMPING APPARATUS Ernest W. Davis, Oak Park, 111.,

assignor to Stewart-Warner Corporation, Chicago, 111., a corporation of Virginia 3 Claims.

My invention relates generally to portable pumping apparatus such as may be used for insecticide Sprayers, oiling systems and similar devices for supplying relatively small quantities of liquid to a plurality of distributed points.

It is an object of my invention to provide an improved combination pumping mechanism and reservoir which is adapted to be manually carried, and which may be conveniently operated manually to discharge a liquid, using a hose or nozzle for directing the liquid to the point to which it is to be supplied.

A further object is to provide an improved pump and reservoir assembly which may be carried by means of a shoulder strap, and which may be carried for long periods of time without unduly tiring the workman.

A further object is to provide a pump and reservoir assembly which is conformed to fit partially around the body of the workman so that its center of gravity is spaced close to the body of the workman.

Other objects will appear from the following description, reference being had to the accompanying drawings, in which:

Figure 1 is a perspective view of the apparatus of my invention showing the manner in which it is carried by a workman;

Figure 2 is a plan view of the reservoir and pump assembly;

Figure 3 is a side eievation of the pump and reservoir assembly;

Figure 4 is a longitudinal sectional view of the flow control valve;

Figure 5 is a view similar to Figure l showing the valve in open position;

Figure 6 is a fragmentary sectional view of the discharge pipe and nozzle;

Figure 7 is a sectional View of the pumping mechanism;

Figure 8 is a sectional view of the reservoir and pumping mechanism in the form in which it is used for pumping lubricant; and

Figure 9 is a central vertical sectional view of the lubricant pump which is shown in Figure 8.

Referring to Fig.1, the portable liquid pumping apparatus of my invention comprises generally a reservoir 10 which has a shoulder strap l2 by means of which it may be supported. A pump I4 is mounted on the reservoir in position for convenient manual operation by the workman, and is adapted to supply a liquid under pressure through a flexible discharge conduit I6 which leads to a control valve 18. A pipe extension 29 terminating in a nozzle 22 is secured to the outlet end of the control valve l8.

Referring now more particularly to the more specific features of the invention, it will be noted from Fig. 2 that the reservoir I9 is of generally arcuate or segment shaped, having rounded ends and having an internal curvature corresponding generally to the curve of the hips of the human body. It is preferably made of light sheet metal having a bottom 24, a top 26 and a unitary sheet 28 forming the side wall. The bottom wall 24 is preferably crimped over the lower edge of the side wall 8, while the top 28 is provided with a downwardly extending flange fitting over the upper edge of the side wall, and may be secured to the side wall by soldering or welding.

A pair of apertured lugs 30, 3| are welded to the side wall 28 and top 23 of the container, the lug 36] at the forward end of the reservoir and the lug 3! at a point adjacent the rearward end of the reservoir, as best shown in Fig. 2. These lugs serve as attachments for harness snaps 32 attached to the'ends of the adjustable belt I2.

From Fig. 2 it will be noted that the center of gravity lies close to the inner curved surface of the reservoir. By virtue of this fact, the weight of the reservoir and its contents does not tend to unbalance the workman and make him lean appreciably to one side in order to counterbalance the weight of the reservoir and its contents. As a result, the workman may carry a relatively large supply of the liquid in the reservoir for long periods of time without tiring when the apparatus is worn in the manner shown in Fig. l; with the strap l2 over the right shoulder, and with the concave inner side wall of the reservoir fitting about the hips of the wearer.

In this position, the handle 34 is conveniently located for the operation of the pump [4 by means of the left hand, leaving the right hand free for the manipulation of the control valve The details of the pumping mechanism are best shown in Fig. '7, the pump comprising a pipe cylinder 36 which is secured in a sleeve 38, the latter being crimped to a plate 49 which in turn is secured to the top 26 by screws 42, a gasket 44 being interposed between the plate iil and the top 26 to seal this joint.

A piston composed of a metallic head 46 and a pair of cup washers 48 is secured to the reduced end portion 50 of a piston rod 52, the upper end of which projects through a cap nut 54 threaded over the upper end of the cylinder 36 and having a gooseneck portion 56 which extends horizontally and has a handle 34 secured thereto. Upward movement of the piston rod 52 is limited by a compression coil spring 60 surrounding the piston rod, while downward movement of the piston is limited by the engagement of the gooseneck portion 56 with the cap nut 54.

A foot valve 62 is confined within a valve body 64 threaded to the lower end of the cylinder 36, a stop 66 being clamped between the valve body and the end of the cylinder 36 to limit upward movement of the ball check valve 62.

A tube 68 is secured to the valve body 64 by a suitable coupling 16, and has its other end suitably coupled to a discharge valve body 12 which is secured in the plate 46 and has a seat for a spring pressed ball check valve 1E. A pressure bell composed of a drawn shell 16, the lower end of which is closed by a cap 18, is threaded in the discharge valve body 12. The flexible hose I6 is secured to a nipple 8Q threaded in the valve body 12 and has its other end secured to the control valve I8.

As best shown in Figs. 4 and 5, the control valve comprises an inlet pipe 82 to which is secured a nut 82. A handle 86 is provided with a relatively large opening through which the pipe 82 passes and is clamped between the nut 84 and a valve body 88 which is slidable with respect to the pipe 82 and is normally moved to its rightmost position (Fig. 4) by a coil spring 96 which is compressed between a head 92 threaded upon and closing the end of the pipe 82 and the inwardly flanged end 9 3 of the valve body 66, a washer 96 and gasket 98 being interposed between the flange 94 and the spring 90 so as to form a liquid tight sliding seal. The head 62 has passageways I66 formed in its external surface for the passage of liquid which may flow into the valve body 86 through ports I62 formed in the pipe 82. The head 92 is also provided with a conical valve projection I64 engageable with a seat formed in a valve bushing 66. The discharge tube 26 is secured in the bushing I66 by soldering or other suitable means and at its outer end carries a spraying nozzle 22.

As shown in Fig. 5, when the handle 86 is moved toward the valve body 83, it presses the body 88 to the left, against the tension of the spring 96, and moves the valve seat bushing I66 away from the c nical Valve projection I06, thus permitting flow of liquid to the pipe extension 20.

The nozzle 22 comprises a cup shaped element I68 which is soldered or otherwise secured to the end of the discharge tube 26, and has secured over the open end thereof a screen III! and disc I I2 conformed to impart a rotary swirling motion to the liquid and a disc H4 which has a small central aperture, and is held spaced from the disc I I2 by a gasket I Hi made of rubber or other suitable material.

In the normal use of the apparatus, the operator will reciprocate the piston rod 52 from time to time, thereby forcing the insecticide solution or other liquid contained in the reservoir I6 outwardly past the discharge check valve 14 into the pressure bell 16, 18, until the operator notes by the magnitude of the force required to operate the pump that a sufficiently high pressure has been built up in the pressure bell. Thereafter insecticide may be sprayed upon bushes, trees, or the like, by opening the control valve, whereupon the solution in the pressure bell will be forced outwardly under the pressure of the entrapped air compressed in the pressure bell. The

operator may thus continue spraying until the contents of the reservoir II] are exhausted, whereupon he may refill the same by unscrewing the filler cap H8.

It will be noted that even though the reservoir I6 is of relatively large sizeof three gallons or more capacityits weight when filled is so distributed that the user may easily carry it without discomfort.

Upon completion of a spraying operation, the residual pressure in the pressure bell may be released by inserting the nozzle in the filler opening, and then opening the control valve I8.

The reservoir it, with suitable slight modification, may be conveniently used as a pressure supply unit for filling oil cups. Such modification is shown in Figs. 8 and 9, wherein the reservoir, similar in most respects to that previously described, is provided with a filler nipple I 20 which is Welded or soldered in the top 26 of the reservoir and has a downwardly extending skirt portion I22 which prevents the reservoir from being filled to a height greater than the level of the lower end of the skirt portion. The nipple I26 is provided with a threaded closure cap I24, a gasket I26 being provided so that the filler nipple may be sealed after the reservoir has been filled with oil.

The pump, as best shown in Fig. 9, comprises a cylinder I28 which is welded to a washer I36, the latter being secured to the top 26 of the reservoir by cap screws I32, a gasket I 34 being provided to seal this connection. It will be understood that the pump, instead of pumping the liquid as in the construction above described, is utilized to pump air into the reservoir, thereby maintaining all of the oil therein under pressure. The pump thus comprises a piston rod I36 having a gooseneck portion I38 to which a handle I46 is secured, the'piston rod having a cup leather M2 secured at its lower end between a face plate I44 and a backing plate M6. The cup leather piston operates as the inlet valve of the pump in the manner of the common bicycle pump. The piston is, however, provided with a safety valve to prevent the production of excessive pressures within the reservoir Ill, this safety valve comprising a disc M8 which is normally held in the position shown in Fig. 9 by a compression coil spring I59, the upper end of which abuts against a washer I52 held in position by a transverse pin it extending through the piston rod I36. The disc M6 is thus normally held by the spring I56 in a position closing one or more passageways I56 formed by registering apertures in the cup leather I42 and its face and backing plates IN, I 66. The lower end of the cylinder I28 is closed by an outlet valve body I58 which is provided with a valve I60 having an insert I62 of suitable soft material engaging a valve seat I64, the valve I66 being resiliently pressed against the valve seat I64 by a compression coil spring I66. The valve I66 is guided for rectilinear movement by a pin I68 carried by a bushing I16 threaded in the lower end of the valve body I58. The valve body has suitable ports I12 for the escape of the compressed air into the reservoir.

As best shown in Fig. 8, the oil is discharged from the reservoir through a tube I14 which is carried by an elbow fitting I16 secured in the top 26, the lower end of the tube I14 being adjacent the bottom 24 of the reservoir.

A flexible discharge hose I18 is suitably secured to the elbow I16 and has a control valve I se-.

cured to its opposite end. The control valve I80 may be of any suitable construction in which the valve is operated by means of a trigger I82. Rigdily secured to the control valve IE is a discharge extension pipe I M into which the pipe I86 is telescoped, a packing nut I88 being provided to prevent escape of lubricant between the pipe I86 and the pipe I84 and to hold these two pipes in any relative position to which they may be adjusted.

The pipe I86 terminates in a nozzle I90 which is shaped suitably for insertion in the filling Openings of various types of oil cups customarily used for the lubrication of machinery. Inasmuch as some of these oil cups are provided with spring operated caps closing the filling openings, the nozzle I90 is provided with a finger I92 which is conformed to engage the edge of such spring caps and raise them to permit the simultaneous insertion of the nozzle ISO in the filling opening of z the oil cup. Inasmuch as many oil cups are not provided with such filler caps, the finger I92 is hinged to a Washer I94 clamped between the nozzle I96 and extension pipe I88, so that when it is not desired to utilize the finger I92, it may be swung to the position in which it is shown in dotted lines in Fig. 8.

Since, in the construction shown in Figs. 8 and 9, the reservoir as a whole constitutes the air bell for storing air under pressure, the operator need pump air into the reservoir at but relatively infrequent intervals, so that under ordinary circumstances, both of his hands will be free for the manipulation of the nozzle and control valve. The pipe extensions I84 and I86 may, of course, be made as long as desirable, so that the lubricator may be very conveniently used for the filling of oil cups located on line shaft bearings suspended from the ceiling of a shop, or for the lubrication of relatively large machines having oil cups located in high and relatively inaccessible places. By the use of this apparatus, the machine oiler need not climb upon ladders or parts of the machine in order to fill the oil cups, and the hazards of filling the oil cups while the machine is in operation are greatly reduced.

By virtue of the provision of the safety valve disc I48, the application of excessive air pressure to the reservoir is prevented. Since this safety valve is located in the air pump, there is no possibility that lubricant might escape with the air, as would be the case if an ordinary safety valve were secured to the top of the reservoir in the usual manner.

While I have shown and described particular forms of my invention, it will be apparent to those skilled in the art that numerous variations and modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details set forth, but desire to avail myself of all changes within the scope of my invention, and to include all such similar and equivalent constructions whereby substantially the results of my invention may be obtained by substantially the same means.

I claim:

1. In a portable apparatus for supplying liquid under pressure, the combination of an elongated curved closed container having a cylindrically concave side wall shaped to conform generally to the contour of the hips of the person carrying it, and when filled with a liquid having a center of gravity close to said side, a' strap detachably secured to the opposite ends of said container at distances spaced from said concave side wall and adapted to pass over the shoulder of the person carrying the apparatus, a pump secured to said container and having the cylinder thereof located partially within and extending through the top of said container, a gooseneck shaped pump actuating rod extending through said cylinder and having a horizontally extending handle portion, which, in its lowermost position, lies close to the top of said container, a conduit connected to said pump to receive the discharge thereof, and manually operable valve means for controlling the flow of liquid through said conduit under the pressure developed by said pump.

2. In a portable liquid pumping apparatus, the combination of a container having an opening in the top thereof, a mounting plate secured over said opening to close the latter, a pump cylinder projecting through said mounting plate, a supporting sleeve secured to said mounting plate and attached to said pump cylinder, a pressure bell secured to said mounting plate, a discharge conduit for said pump extending through said mounting plate and communicating with said pressure bell, and a gooseneck shaped piston rod having a horizontal handle portion which, in its lowermost position, lies closely adjacent the top of said container.

3. In a portable apparatus for supplying liquid under pressure, the combination of an elongated curved closed container having a side shaped to conform generally to the contour of the hips of a person carrying it, and when filled with a liquid having a center of gravity located close to said side, a strap secured to the opposite ends of said container and adapted to pass over the shoulder of the person carrying the apparatus, a vertical pump cylinder secured in said container near one of its ends, a piston, a piston rod extending through the top of said cylinder, a horizontally extending handle at the extremity of said piston rod, a pressure bell located adjacent the upper end of said pump cylinder and extending upwardly from the top of said container, and a discharge conduit for said pump, a portion of said discharge conduit being in communication with said pressure bell.

ERNEST W. DAVIS.

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