US2462980A - Fluid pump - Google Patents

Description

March 1, 1949. Q s. w. LlTT 2,462,980 7 FLUID PUMP Filed Oct. 19, 1945 I Fl H 9 H 3| 7 I 20 l9 n u p L S a p55 1': 4 INVENTOR. g F SEYMOUR w. Lnr

2 i3 ATTORNEY Patented Mar. 1, 1949 U N I TED" This invention relates generally- *tofluid displacement mechanisms, andmore particularly to manually operated portablepumps of-the-;re--

ciprocating plunger type such as are-used -for inflating pneumatic tires and a wide variety of pneumatic'articles and devices.

An objector this invention is to providea pump of-the above described character whose barrel or cylinder is provided at itslower end with a pivot-- ally mounted foot piece on which the operator steps to anchor thebarrel to a supporting surface againstshi fting thereon during operation of the pump, and has its plunger rod provided with a handle-mounted thereon for rocking movement, so that-should downward pumping strokes be impartedto the plunger indirections non-parallel to the axis -of the barrel the-handle will tilt on the rod rather than react'rigidlytherethrough to cause binding of the-rod in the upper end of the barrel thus greatly increasing'the efliciency of the pump bythe-lessened frictional resistance to motion-of-the rod, and reducing wear on--theworking parts of the pump soas-to'prolong'its useful-life.

It is another object of-this invention to provide 'an elongated barrel or cylinder -B "composed of a pump Whose movably mounted handle, in addi--- tion to precluding binding ofthe plunger rod-in the-end of the barrel through whichtherod' projects, is movable to a non-use'position wherein itslengthis substantially parallel to the length" 0 of the rod, so thatwith the 'foot piece 'swungabout a the barrel to lie along the length of-the latter;- thepump will present a slender, compact parcel free of lateral projections, for convenient storage in a toolbox .orcompartment of: an automobile It "is a further object of'this inventionto pro-'- vide; a pump from whose barrehthe air being pumped is discharged into a flexible hose securedto thelower. end of the barrel and provided: with 1 a detachable connector adaptedto: co-act with 40 the movably mounted handle when in its non-use I position, .toconfine the handle against movement, l and with the hose maintained substantiallyparallel with and alongside of the barrelso that the aforestated slender parcel free of pronounced lateral projections willzbe maintained.

It 's'ls a still further. object 1 of this invention 1 to provide; a pump having. a lubricating i washer I mounted onthe plunger rod for wiping movement; against, the wall.- of the barrel inoneidirection by-- the. pump plunger, ywith-ira ibufier spring being mounted on ltheaplunger rod with-sufiicient-securitysto travel with therod-and move the'washer 1 therewithtto xeifect wiplng movem-ent-ioithe-ban rah-wall initheioppositedirectioniby the washetttfi 2 whereby to render the washercapable of--lubrieating the barrel wall withmaximum-efficiency: With these and. other objects in view; the invention resides in" the wcombinations, arrange-- ments and functional relationships-of elements as set forth in the following specification andparticularly pointedout in the appended" claims.

In-Ithe accompanying drawing;

Figure 1 is a View showing in sideelevation; one

a form of pump embodying-this invention;

Figure 2 is a longitudinal sectional viewtaken generally=on the line'22 of-Figure 1, and withthe handle in non-use position Figure--3 is a view-of-the-pump in side'elevation,

5. and showing the handle-in working position Figure 4 is an enlarged detail sectional view takenpn-thelinet-A of Figure-2; and

Figure s is a reduceds'ca-le view of the pump in side elevation and showing diagrammatically full and brokenlines, the movement of the handle which-*takes-place under certain conditions of operation-.---

Referring" specifically to the drawing, A the .in-v

g vention, in its illustrated embodiment comprises an open endedtube" l0 threaded at its lower end at ,and screwed into a base fitting [2 having a flat bottom l3adapted to'rest on. a. support.- The base fitting 12y hasyan air, discharge port l 4 com? "municating ,with'the lowerend of the tube 10, and hastsecured thereto by. a nipple [5, one end of a length ,of,iieiribleflhoseT l6 whose other end hasra suitable connector I'lffor attachment to the valve, stemlnot shown) of a pneumatic articleordevice V to1 be}inf l ated. m

The ,uppernend. of the, tube 1 0 is threaded ine;

ternally at 18, and has screwed thereinto a ,cap 19 having an air induction port 10., and a central opening 2|, through,Whichslidably works .a rereceive a nut,25 which clamps a plungerrP on the stud;against;, uclflshoulder;

Thejplunger, P is composed ofsa flexible cupped disk; 26:" confined between metalrwashers 21: and

2 8,1 and: adapted to hmefiuidsealing engagement with the-wall of the-=barrel=during the downt stroke'of-the plunger so-as-to pump air inadvance of-theplunger into the hose l6; andzto permit air drawn into the barrel by-the plunger through the induction-port Zllgduringsuch downstroke, topass between the disk zit-and the barrel walk during 5% the following i upstroke ofthe plungergas is the ciprocableplunger rod,22, the lower end of which isereduced in diameter to providean ,annularu shoulder 23 and a stud 24;externally threaded to H 3 usual cycle of operation in a single-acting pump of this type.

A handle H in the form of a bar shaped to fit the hands, is provided medially between its ends with a laterally projecting portion 30 bifurcated to define spaced lugs 3| between which the upper end of the plunger rod 22 is received for pivotal mounting of the handle on the rod by means of a pin 32. The handle can thus be swung on the rod about the axis of the pin 32 to occupy working positions at an angle. to the rod as shown in Figures 3 and 4, or a non-use position parallel to the rod at one side thereof as shown in Figure 2. In its non-use position, the rod is received in a longitudinal recess 33 formed in one side of the rod from one end thereof to the space between the pivot lugs 3|, so as to bring the handle as close as possible to the rod and thus contribute to the slender parcel which is formed by the pump for storage.

Movement of the handle H from its non -use position,'is limited to a predetermined tilted position beycndthe transverse or right angular position shown in Figure .3, by a stop shoulder 35 on the handle which is adapted to strike the rod 22. A spring clip 3% of generally U-shape in plan, has its bight portion 31 constricted about the air hose l6 adjacent the endof the latter, so as to be permanently mounted on the hose.

The spring arms 38 of the clip 36 have divergin portions 39 adapted to receive the plunger rod freely therebetween, and have converging portions 40 adapted to engage oppositely projecting shoulders 4| on the handle H when the clip is snapped over the handle in the non-use position of the latter as shown in Figure 4, by spreading the arms 38 under the camming action of the diverging free end portions 42 of the arms with the handle. With the clip 36 applied to the handle, the latter will be releasably retained in its non-use position in proximity to the cap l9 of the barrel B, and will support the flexible hose l6 in a position close to and substantially parallel with the barrel.

A foot piece F preferably constructed of a length of wire bent into generally U-form, has trunnions 45 on the free ends of its arms 46, received in diametric openings in the base fitting |2 to mountthe foot piece for pivotal movement to occupy the active position shown in Figures 3 and wherein the handle projects laterally from the barrel, or an inactive position shown in Figures 1 and 2 wherein the barrel is received between the arms 46 of the foot piece. The closed end portion 41 of the arms 46 is laterally bent to forma stop for the foot to prevent slippin of thejlatter from the foot piece during use of the pump.

Mounted on the plunger rod 22 is a lubricating washer 50 of felt or other suitable material, which is adapted to be moved upwardly by the plunger P during the upstroke of the latter, to wipe lubricant along the internal surface of the barrel. A coil buffer spring 5| which is tapered longitudinally,

is mounted on the rod 22 between the washer 50 and the upper end of the rod, and has its .larger end bearing against the washer. The smaller end of thespring 5| embraces the rod 22 with sufiicient security for the spring to travel with the rod and thus assure that during the downstroke of the plunger, the spring will move the washer downwardly to reversely wipe the barrel surface, thus rendering the washer capable of efficiently spreading lubricant over such surface in the operation of the invention which is as follows: W V

With parts of the pump in the position shown in Figure 2, the pump forms a long, slender and compact parcel free of such lateral projections as might interfere with storage and removal of the pump from a restricted space. To

use the pump, it is only necessary that the clip 36 be released from the handle H to free the latter for adjustment from its non-use position to its working position, and to enable the connector H to be applied to the valve stem of the article or device to be inflated.

With the pump occupying a vertical position as'shown in Figure 3, one foot of the operator is placed on the foot piece F so that the length of the foot extends transversely with respect to the length of the foot piece, to thus prevent lateral shifting of the lower end of the barrel B. 'By the provision of the laterally upward projecting end portion 4! of the foot piece, the foot of the operator will be confined against slipping ofl of'the free end of the foot piece, to thereby provide a more .secure anchorage for the lower end of the barrel on a supporting surface.

With the handle grasped in both hands of the operator, pumping of air through the barrel B will be effected by vertical reciprocating movement imparted to the handle to correspondingly actuate the plunger P. Should the barrel swing about the axis of the trunnions 45 of the foot piece F during this pumping operation, as is the tendency when pumping against an opposing pressure, the manual force exerted vertically downward upon the handle H will be in a direction non-paralleI or at an angle to the axis of the barrel B. Were the handle H rigidly secured to the upper end of the plunger rod 22 in the manner of pumps of the type heretofore proposed, the resulting lateral or horizontal component of the vertical force exerted at an angle to the barrel axis, reacts adversely upon the rod to produce a binding tendency thereof in the opening 2| of the barrel cap l9, thus setting up a resistance to pumping movement of the plunger, and hence reducing the efiiciency of the pump, as well as increasing the wear on its working parts.-

However, by freely pivoting the handle H at 32 in accordance with the illustrated embodiment of this invention, the handle will be free to rock or tilt and thus yield relatively to the pump rod, with the result that should the barrel B be occupying a tilted position to one side or the other of the perpendicular as shown in full .and broken lines, respectively, in Figure 5, the adverse reaction of the rod 22 in the opening 2| will bereduced to a minimum, -so that the tendency of the rod to bind inthe opening will be correspondingly reduced, thus freeing the rod for its pumping stroke with but negligible frictional resistance from the barrel. Therefore it will be manifest that the, pump can be operated with less manual effort to displace fluid with higher efficiency and less wear upon working parts, all with a mechanism of simple, rugged construction.

I. claim:

1. A pump of the class described comprising: a barrel; a plunger'in the barrel; a rod connected to the plunger and projecting from one end of the barrel; an elongated handle; means pivotally mounting said handle intermediate its ends on said rod to occupy working positions wherein the handle projects on opposite sides of the rod, and a non-use position wherein the handle is disposed'substantially parallel to the rod at one side thereof; aflexlble air :hose connected to the barrel remotely from said one end thereof and adapted to conduct pumped air from the barrel; and a generally U-shaped spring clip carried by said hose and providing spaced portions between which said rod is received with such portions in latching engagement with said handle to confine the latter in non-use position and support the hose extended at the side of the barrel.

2. A pump of the class described comprising: a barrel; a plunger in the barrel; a rod connected to the plunger and projecting from one end of the barrel; an elongated handle having a laterally projecting bifurcated portion medially between its ends providing spaced lugs between which the outer end of said rod is received; a pin supported by said lugs and passing through the rod to pivot-ally mount said handle on the rod; said handle having oppositely disposed shoulders; a flexible air hose connected to the barrel; and a generally U-shaped spring clip carried by said hose and defining portions adapted to receive said rod therebetween and to be snapped about said handle in engagement with said shoulders thereof when the handle occupies a nonuse position substantially parallel with the rod at one side thereof.

SEYMOUR W. LITT.

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

UNITED STATES PATENTS Number Name Date 785,154 Cordeau Mar. 21, 1905 882,874 Dism-ond Mar. 24, 1908 1,025,221 Virtue May 7, 1912 1,108,903 Hancock Sept. 1, 1914 1,112,202 Estes Sept. 29, 1914 1,240,855 Jones Sept. 25, 1917 1,300,821 Curtis Apr. 15, 1919 1,301,802 Anderson Apr. 29, 1919 1,388,784 Youngblood Aug. 23, 1921 1,526,309 Hof Feb. 10, 1925 1,608,723 Cole Nov. 30, 1926 1,625,099 Rudolph Apr. 19, 1927 1,737,534 Davis Nov. 26, 1929 1,880,732 Bolens Oct. 4, 1932 FOREIGN PATENTS Number Country Date 23,711 France 1921 (AdditiOn to No. 519,493)

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