US1474665A - Double-acting air pump - Google Patents

Description

Nov. 20,1923

|. T. EASTMAN DOUBLE ACTING AIR PUMP Filed Jan. 5. 1922 2 Sheets-Sheet 1 .i N Enf NN Nov. 20, 1923 v l. T. EAsrMAN DOUBLE ACTING AIR PUMP `-\Fi1\ee1rlan. 5, 1922 2 sheets-sheet 2 I/v VEN Taf?.

inw

y 4o throughoutv d' the Patented Nov. 26, 1923;

ravine fr. EASTMAN. or Conv, WYOMING, Assieme or ONE-HALF 'ro' no MAmorf-runNnA-roms; MINNESOTA.' .d

. -L MM5@ y @PArFEiNTI ori-reel'g-j n DOUBLELCTING faire PUMP. y

.Implication med January's, 1922. Serin no. 5:5?{1201 To @ZZ whom t may concern:

Be itl known that "I, IRVING T. EASTMAN;

acitizen of theUnitedStates, residing at Cody, inthecounty ofParkand 4State of .5 lVyominO, have invented certain'new and useful Improvements 'in Double-ActingAir Pumps; and I Clo-hereby declare the folien#l ingto bea full, clear, Vand' exact descriptionofth'e inventioin such as Will enable 'others skilled inthe-art to v#.vhfieh"'it appertains to makey and use vthe "sam el.

This invention rela-teste man pimp aria v particularly-to a small portableair pump` adapted toA bel clamped toI aboard 'or-other member and foruse-fin'pumping-np automobile tires.

Y It is an object of this jinvention'to provide capacity and the air from the advancing` side' of thepiston inthe largerr cylinder being delivered tothe retreatingsidegrof the piston 4 in the smaller cylinder.`

. It is still another object of theiinvention to 4utilize the pistons and pistonvi'o'ds as yivell 3o asthe commoncrosshead Whiclractuates the rods7 as the connecting'means for delivering the air from one cylinder to another, thus doing' away YWith-the necessity ofseparate conduits or passages. Y

These and other objects of the invention Willpbe fully' setforthfin'the following def scription VIn`ade'- in connection with the ac--j companying" drawings in VWhichf lilrefrefer-l Y enceeharact`e'r'sreferA tov the 'same -gparts'l different vieivsb` and-v `in' which,v ,l Fig.V l is a vieWin Sidefelevation of the pump 'showing the same clamped in posi? Fig. 2 is 'alcen'tral verticaljsection ofthe cylindersl and cresshead andf Fig. 8 is-a "vertical 'section 'italien on the ma?, sperrige Re erringto th legof which is adapted' tcontaet; With one surfae fof a table {onboard-and *theother le Y Y Y .drawingsg the vdevice Y 50 comprisesfa Ushapedclampmeniberf1, one

4 thisfpassag'ek? -The-a n cate With chanibe vaarweg:einergeronan f and'V suitable handle '4. The upper .armbf 55 i the member l has'an upstanding-flug there` on and to 1 Which a'bifurcated arm ifis pivfoted' by a headed pivot pin G'heldin .position y bysuitablemeans, sueh asa split''keypasslr` ing throughthe end thereof. The arm'f is" 60 integrally. connected 'Withand disposed un-y der vthe cylinder head 5. 'Thiscylinder headf 5 is in 'the'sha'pe of'anl oblong plate 'with f circular ends,fone end bei-ngof'greater diam-i eter than `theother `and is` of substantially .65 the same outline :as the 'cylinder `head 7 disf` posed -at the 'otheriend of ltrhefpump[and shown in Fig.` 3. The:cylinder heads "'and 7 have shallow Vcylindrical recesses formed `therein into Vwhich lare n fittedl the cylinder" 70 barrelsv 8k Aand y9. The headsf `and 7.. are, clampedy together onthe barrels 8 and 9 by; spaced headed .boltslO passing-4 throughlugfsin the headl 7` and'threaded into yCoriesp'ond'- inglugs on'thehead'. The Ahead 5 isfprof` 75 vided With raisedboss'es 5b at vthe :centerso'fits circular portions which form stuffing"V` boxes rand are threaded tore'ceive the glands". l1 threaded thereinto. Th'ecylinder 8 is provided with a piston'lQ and the 'cy'li'ndei`l 9 180l is provided Withafpiston 13, Which pistons* are provided'with suitable pac'king'or pistonf rings to form a tight'fit with the cylinders.'

A piston rod 14: is secured to` the piston '12- by being soreived thereinand a piston 41jod85 l5 is similarly secured to the piston 13, these if piston rods passing out'at the frontfend 'of the :cylinders through the stufling glands 1l.

suitable 'packing material being compressed? 'in the boxes 5b about 'the' rodsby'thefsaid' 90 fi:

f ears 16a which leinbracela lever lZftojiw-liich theyffare pi-votally' Vsecured by a suitab'lydield pivot pin. Y The levcrw'ill be, lat itsfvuppei1 en'd,"-provided with suitablefhandleg noti i showin and;- visf 'icurved' 'inwardlysomewhat" 100 at' its lofwerend andv -pivotedbetivee paced]-- their seats by coiled springs 19, the springs abutting said balls at one end and at their other ends abutting screw plugs threaded into said valve chambers from the faces of the piston opposite the apertures above noted. It will thus be seen that the apertures communicating with chamber 12 are oppositely disposed and the valves controlling the same are, likewise, oppositely disposed. The piston rod 141 has a passage extending axially therethrough which is in Y communication with the passage '12a The crosshead 1G is also provided with a passage 1 6"A with which the passage in piston rod 14 communicates. A piston rod 15 is Aalso formed with an axial passage therethorugh communicating with the passage 1G" in the crosshead at one end and communicating at its other end with a chamber 13n formed in the piston 13. The piston 13 is also pro-v vided vwith oppositely disposed apertures in the face thereof communicating with the passage 13fL and these apertures are also controlled by spring pressed ballsy forming check valves, the springs being held in place by threaded plugs 20 having central apertures therethrough. The crossheads 5 and 7 are provided with slightly upstanding bosses opposite the lower ends of the cylinder 8 forming check valve chambers, the valves therein being also ol the springpressed ball type, the springs or' which are held in place by apertured and threaded plugs vdisposed on the inside of the chamt bers. These valves control apertures in the top of said bosses communicating with the atmosphere. The cylinder heads 5 and 7 are also provided with chambers or passages 5 and 7c terminating at the inside of said heads in threaded apertures and a suitably constructed conduit 21 is connected with these threaded apertures and is provided with a central discharge member 22 to which a flexible hose 23 may be connected. The passages 5c and 7C communicate with valve chambers 5d and 7Cl having apertures'communicating with the interior of the cylinder 9, these chambers being equipped with check valves in the form of spring-pressed balls, the springs being held in place by a threaded plug screwed into the outside of the cylinder head. Y

The operation of the pump is as follows:

The pistons 12 and 13 will be reciprocated i by oscillating movement of the handlel 17.

Assuming the pistons to be in the position shown in Fig. 2, when the saine move to the right, the Vair will be compressed between the right hand side of the piston 12 and the right hand end of the cylinder 8. This compressed air will open the lower check valve shown in piston 12 and the air will pass 'therethrough and through the passage through piston rod 14 through the passage 1Gb inthe crosshead, through the passage through the tube or hose 23. The return of any of this air will, ot' course, be prevented by the check valve in chamber L piston moves to the left on the return stroke, the air under pressure delivered at the left hand side oi the piston 13 will be prevented from vagain passing into the piston by the upper check valve of the piston and will open the valve inchamber 7d passing through the passage 7C into the discharge conduit 21 to be discharged' through the tube 23. This air will be prevented lfrom passing back into the. cylinder by the check valve in chamber 7 d. At the same time, the Apiston 12 will move to the left and the air compressed between this piston and the lefthand end of the cylinder and will open the upper valve in the piston and passV through the piston rod 14; to crosshead 16 .and piston As th e rod 15, will be delivered through vthe lower Y valve in the piston 13 and to the right hand or retreating side of the piston. Vith each stroke of the pump, therefore, the air compressed in the larger cylinder will be delivered to the small cylinder and the air pre? viously delivered tothe smaller cylinder will be discharged. at higher pressure. will be noted that there is .no inlet passage for air from the atmosphere to the'. high pressure cylinder 9. The air drawn into the pump will be taken at each stroke through the inlet valves in the ends oi the cylinder 8.

From the above description it will be seen llO that applicant has provided an exceedingly y simple and useful pump. By passing the air` through the piston rods in the crosshead the structure is greatly simplified and many parts eliminated. Thecylinders will voscillate about the piston 6 as the pump is oscil-V lated and the tire or other member to which the air is to be delivered will. soon be charged withair at a high pressure. The device is exceedingly compact, inexpensive to manu facture and can be quickly assembled.v The parts can also be readily taken apart,'if for any reason this becomes necessary. The pump can be quickly and easily clamped upon the running boardA of an automobile,

on a table, or other suitable support. Y

It will, of course, be understood that various changes may be made in the form, details and arrangement of the parts without departing v:trointhe scope of applicants invention, which, generally stated, consists in the matter shown and described and set l forth iii the appended claims.`

fwliat is claimed is: l. An air pump comprising high and low v .pressure cylinders, a piston in each cylinder,

l 2. The structure set forth in claim l, said low pressure cylinder having valve-equipped inlet openings at .each end and the high` Y pressure cylinder having valve-equipped discharge openings on each end.

3. An air pump comprising two parallel cylinders of `different diameters, a piston for each cylinder and a piston rod connected with each piston, a cros'shead connected to said iodsl for simultaneously moving the same, -said pistons having oppositely facing valve-equipped openings in the faces' thereof communicating with chambers therein, and the chambers in said pistons in the respective pistons conmiunica'ting with axial passages formed in the piston rods, said crosshead having a chamber therethrough communicating with the passages in the piston rods whereby when the pistons are reciprocated, air will be delivered from the advancing side of the larger piston to the retreating side of the smaller piston.

4. The structure set forth in claim 3, said larger cylinder being closed except for valve-equipped openings at each end communicating with the atmosphere and said smaller cylinder being closed except for valve-equipped discharge passages at each end thereof, and ya common discharge conduit communicating with said passages.

5. AV portable hand-operated double-acting compound pump comprising two parallel cylinders of different diameters, a piston in the larger cylinder having a chamber therein and inwardly opening valves in each face controlling communication with said chamber, a piston in the smaller cylinder having al chamber therein, and outwardly opening valves controlling communication with the chamber therein, hollow pistonrods connected, respectively, to said pistons and 7'. A double-acting air pump having high communicating with the chambers the-rein, a crosshead connected to" and adapted` to opeiate' said rods and pistons and having -a passage therethroughV communicating* with the passages through said rods, air inlet means inthe larger cylinder and discharge means in saidsm'aller cylinder.-

Yas

6. A compounddouble-acting pump Yhaving high and low pressure cylinders, pistons having ,chambers therein in said cylinders and hollow piston rods connectedy to said pistons and connnunicating with the chambers therein, means having a passage therein connecting said rods andthe passages `therethrough, one of said pistons having an" inwardly opening valvein each face'controlling communication with the chamber therein and the other piston having an out-v wardly opening valve in each face,jsaid valves controlling communication with' the chambers in said piston.

and low pressure cylinders relatively rigidly mounted for oscillating movement', apiston for each cylinder, a rod connected toeach piston'having a longitudinal passage therethrough and projecting from said cylinders at one end, a cross head connectingV said rods and having a passage connecting the passages therein, Van oscillating lever pivvoted to said crosshead, and means in said pistons whereby air is passed 4into' and .through said piston rods at each movementv of said lever in either direction.

8. The structure set forth in'cla-im 6, the high pressure cylinder having outwardly opening valves in the end s thereof andthe low pressure cylinder having inwardly open-v ing valves in the ends thereof.

9.V A double-acting compound pump having high and lowpressure cylinders,` a piston in each cylinder having a chamber therein, each piston having check valves in both faces thereof controlling communicaf tion with the chamber therein, the valves in one piston working oppositely to the valves in the other, hollow piston rods connected to said pistons andV communicating vwith the chambersftherein and communicating with cach other, inlet means in the high pressure Y pressure cylinder. y ln testimony whereof I affix my signature'. Y l ravine r. EASTMAN. lVitnes-ses: 4 s

J. FGUNsuL, F. F. MoGriiE.V

cvlinder' and discharge means in the p low` jVV y c f Y x10 .K

Images