USRE14789E - Fluid-pump - Google Patents

Description

c. A. ANDERSON.

FLUID PUMP.

APPLICATION FILED JUNE 14, I9I9.

w. r 4 1m m 2 Reissued Jan. 13, 1920.

N Ill/m Char-84 62. Qndenmn C. A. ANDERSON.

FLU|D PUMP. APPLICATION FILED IUNE 14. 19m.

Reissued m. 13, 1920.

' UNITED STATES PATENT OFFICE.

CHARLES A. ANDERSON, OF CHICAGO, ILLINOIS, ASS'IGNQR, IBY DIRECT AND MESNE ASSIGNMENTS, TO G. E. SUNDSTROM, OF CHICAGO, ILLINOIS.

FLUID-PUMP.

filed June 14, 1919.

To all whom it may concern:

Be it known that I, CHARLEs A. ANDER- SON, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Fluid- Pumps, of which the following is a specification.

tures of the invention is to provide improved construction and arrangement which dispenses with special valves, particularly check valves, and to do all valving by means of the pump piston. Another feature is the improved simple connection between the piston and the crank shaft which will cause combined reciprocatory and oscillatory movement of the piston in the cylinder in order that air passageways or channels in a the piston may cooperate with inlet and out- I permitting let ports to efiiciently control the in-flow of air, the arrangement involving the reciprocation of the piston at right angles to the crank shaft. Another feature of my invention is the utilization of the crank case for compression and the utilization of such compressed air in the cylinder together with the compression caused in the cylinder by the piston. Another feature involves arrangement for preventing the escape of lubricating oil from the cylinder into the air delivery pipe. Another feature resides in back-flow of compressed air into the cylinder to expand therein to effect cool ing before the piston operation to compress air in the cylinder and discharge it therefrom, and another feature resides in the simplicity of the pump and the most eflicient op eration with a minimum number of parts.

Another important feature of the invention resides in improved mechanism for readily connecting the pump in driving relation with the engine or another driving source.

The various features of the invention are Specification of Reissued Letters Patent. Reissued Jan, 13, 1920,

Original No. 1,267,040, dated May 21, 1918, Serial No. 54,294, filed October 6, 1915.

Application for reissue Serial No. 304,357. 1

clearly illustrated on the accompanying drawings in which- Figure 1 is a front elevational view of the pump with part of the cylinder broken away.

Fig. 2 is a side view, from plane 2-2, Fig. 1,

Fig. 3 is a horizontal sectional view on plane 33, Fig. 1,

Fig. .4 is a side view from the left of Fig. 1, with the crank case cover removed, an

Fig. 5 is a complete vertical sectional view with the piston in its lower position.

An integral casting C- provides the. sup porting base .10, the crank case 11, the crank shaft bearing sleeve 12, and the cylinder 13.

J ournaled in the sleeve 12 is the crank shaft 14, whose inner end has the crank arm 15 terminating in the main bearing section 16, which together with the detachable bearing cap 17 forms a socket 18 for receiving the ball 19 on the end of the horizontal limb a of the L-shaped connecting rod 20 whose vertical limb b at its upper end is pivoted to the wrist pin 22 which extends diametrally through the inverted cup-shaped piston 23; As shown, the wrist pin 22 is at right angles to the crank shaft, andthis arrangement together with the L-shaped connecting rod and its ball and socket connection with the crank arm causes combined longitudinal reciprocation and axial oscillation of the piston when the crankshaft is rotated, the outer end of the crank shaft carrying a gear pinion 24 adapted for meshing engagement with a suitable driving gear 25 connected with the vehicle engine or other driving source. i

, The pump shown has the diametrally opposite air inletand outlet ports 26 and 27 respectively, a suitable delivery pipe or hose being in practice connected with the outlet port. On the air intake side the piston has the air inlet passageway or channel 28 cut in its face and communicating with the upper end of the cylinder. As the combined reciprocatoryand oscillatory movement of the piston causes each point thereon to describe an ellipse the air passageway 28 is so curved and of such length that just after the piston begins its downward movement toward, the crank case, the lower end,

of the channel comes into communication with the intake port 26, and remains in communication with the port until the piston nears the lower extremity of its movement, whereupon such communication is interrupted; thus as the piston travels downwardly toward the crank case air will flow through the port 26 and channel 28 into the cylinder to be compressed during upstroke of the piston, the axial rotation of the piston when at the lower part of its stroke shifting the channel 28 away from and closing t e intake port 26, which remains closed until just after the piston reaches the upper extremity of itsmovement and begins its downward movement.

At the air outlet side of the pump the piston has the short channel 29 cut in its face, its upper end being connected with the duct 30 which extends through the piston body to the top of the piston to communicate with the cylinder. This passagewa 29 also extends elliptically in order that t e channel will remain in communication throughout its length with the outlet port 27 as the piston travels. The relative arrangements of the assageways 28 and 29--30 is such that w en the inlet passageway 28 ap- I proaches registration with the intake port 26 at the beginning of the down-stroke, the passageway 29 will leave the outlet port 27, and the passageway 29 will remain away from the outlet port until the piston has traveled clear down and upwardly a distance and effected some compression in the cylinder, the upper end of the channel then registering with the outlet port to permit the compressed air to escape through the channels 30 and 20 and the outlet port such escape continuing until the piston reaches the top of its stroke and terminating just before the air inlet channel 28 again comes into re 'stration with the intake port 26. The re ative positions of the piston channels and cylinder ports for the up-position of the'piston are clearly shown in Figs. 1, 2 and 3, the piston being ready to rotate in the direction of the arrow and to move downwardly. Immediately upon rotating the channel 28 comes into registration with the air intake port and the outlet channel moves away from the outlet port and then during downward movement of the piston the channel 29 will be covered by the cylinder wall and the channel 28 will remain in communication with the intake port for the passage of air from atmosphere to the cylinder above the piston. In Fig. 5, the piston is shown in its lowest position, the upper end of the channel v28 having been carried just beyond the intake port to close it against air inlet, and then during upward movement of the piston both inlet and outlet channels will be closed by the cylinder walls until the piston has traveled upwardly a distance,'and then 29and the outlet port. Just before the piston reaches the top the channel 29 will again leave the outlet port 27 and then when the piston starts to move downwardly the channel 28 will again come into registration with the intake port 26 to admit another charge of air from atmosphere into the cylinder.

I also provide for com ressing air in the crank case and utilizing the compressed air. The crank case-is closed to the exterior and therefore when the piston is traveling downwardly air will be compressed therein. In order to permit flow of this compressed air into the cylinder above the piston, either one or both of the piston channels may connect with the crank case at the lower end of the piston stroke, such connection being arranged to take place just after the closing of the inlet port 26. In Fig. 4 (dotted lines) and in Fig. 5 (full lines) the piston is shown in its lower position and it will be noted that the lower ends of channels 28 and 29 are open to the crank case. Compressed air can therefore flow from the crank case into the cylinder above the piston to equalize the ressure, and augment the volume of air in t e cylinder, and then the compressed air in the cylinder will be'further compressed when the piston is forced upwardly, this additional pressure from the crank case adding greatly to the capacity and efliciency of the pump. When the piston travels upwardly the air in the crank case will be expanded but atmospheric pressure is restored therein through the port 31 and the groove or passageway 32 cut in the piston surface, this groove being of a length to come into communication with the port 31 as the piston nears the upper extremity of its movement. The groove or channel 32 also extends in elliptical direction in order to keep communication with the port 31 as the piston turns, and the movement of the piston at the upper end of its stroke being practically a turning one, the channel will be disconnected from the port before the piston starts on its downward movement, and then the air in the crank case under atmospheric pressure'will be compressed during downstroke of the piston to be released into the cylinder above the piston through the channels 28 and 29 when the piston reaches its lower position.

The air channels on the pistonare made of sufficient width to prevent clogging thereno chance for the proper valving to fail.

In the lower part of the crank case'there is Ereferably a charge of grease or oil 0 of su cient depth so that the crank arm and the end of the piston rod may splash therein to throw the oil about so as to lubricate the piston, and cylinder engaging surfaces and the bearings of the piston rod with the piston and crank. The grease or oil in the crank case also diminishes the air space and increases the compression therein. In. the casting C I preferably leave the opening 33 at the crank case end and provide cover 34 therefor, this'enabling inspection of the interior of the pump, and a smaller opening 35 can be provided in the cover for the charging of oil in the crank case and a plug 36 can be used to close the opening.

As the pump operates oil may tend to accumulate in the outlet channel 29 and flow through the port 27 into the delivery pipe and to the tire or other device to be inflated, will soon become greater than the pressure in the cylinder when the channel 29 first comes into register with the outlet port 27 and there will therefore be a sudden and rapid flow of air into the cylinder and this in-rush of air will carry with it any oil in the delivery pipe, port 27, or the piston outlet channels so that when the pressure in the cylinder does overcome that in the device to be inflated the air will flow through the passageways which have been cleaned of oil or other accumulations. Furthermore, the sudden rush of air into the cylinder from the device to be inflated will by its expansion have cooling effect on the cylinder walls and piston. The exterior of the cylinder walls may. also be corrugated or flanged as shown to give extensive radiating and cooling surfaces.

n Figs. 1 and 5 the mechanism for controlling the coupling of the pump with a driving source is illustrated. Surrounding the crank shaft bearing sleeve 12 is the hub 37 from which extends the handle or lever 38. The outer end of the hub 37 extends beyond the. sleeve 12 and encircles the inner hub 39 on the pinion 24 and this hub has the peripheral groove or run-way 40 for clutch balls 41 retained in pockets 42 in the hub 37, a sleeve 43 surrounding the hub 37 and engaging over the pockets 42 to confine the balls therein and in the run-way 40. The bearing sleeve 12 has also the diagonally extending peripheral groove or run-way 44 for a ball 45 in the pocket 46 in hub 37 and a spring clip 47 secured by a screw 48 engaging over the pocket 46 to lock the ball 45 therein, and this screw preferably extends through the sleeve 43 and into the hub 37 to hold the sleeve in place on the hub. The pinion 24 is locked against rotation on the crank shaft by the key 49v and is normally out of the plane of its driving wheel '25. \Vhen it is desired to use thepump the lever 38 is swung laterally in the direction of the arrow (Fig. 2) and the ball 45 travels through the diagonal run-way 44, the hub- 37 will be shifted outwardly along the crank shaft and the pinion 24 is shifted along the pockets for more efliciently receiving the ball to yieldingly lock the hub 37 in its in and out positions on the bearing sleeve 12.

In order to prevent inward longitudinal movement of the crank shaft a ring 50 encircles the shaft in the peripheral groove 51 and is confinedin the groove adjacent the outer end of the sleeve 12, by the under-cut end 52 of the pinion hub 39. In order to lubricate the crank shaft bearing surfaces a channel 53 is cut through the shaft and is open to the crank case so that oil will be splashed thereinto and delivered to the bearing surfaces when the pump operates. By regulating the amount of oil or grease in the'crank case the compression space in the crank case can be made as desired. The greater the amount of oil or grease theless the compression space and the greater the compression.

By loosening screw 48 and withdrawing the plate 47from the pocket 46 the ball 45 can be removed and then the hub 37 together with the pinion 24 can be removed. Withdrawal of the screw 48 will also release the sleeve 43'and this sleeve can then be readily rotated to bring the hole 54 there in successively into registration with the ball pockets 42 in order that the balls may be withdrawn whereupon the pinion can be disconnected from the hub 37.

The bottom of the crank case may be integral with the casting C but preferably a removable bottom 55 is provided. With this removable bottom and the removable cover 34 it will be very easy to get at the piston rod and its crank and piston connections.

1 do not of course desire to be limited to the exact constructions, arrangements and operations shown and described as modifications are no doubt possible which would still come within the scope of the invention.

I claim: a

1. In a fluid pump, the combination of a cylinder, a piston,'a crank shaft, connections therebetween. for effecting reciprocation and oscillation of the piston, inlet and outlet ports for said cylinder, air passageways in to regulate the flow of the fluid, a crank case to the outside on a predetermined outward movement of the piston.

2. In a fluid pump, the combination of a cylinder, a crank shaft at right angles therewith, a. piston within the cylinder, a wrist pin on the piston at right angles with the crank shaftwhen the piston is at the ends of its longitudinal reciprocation in the cylinder, a, crank arm on said crank shaft, and an L-shaped connecting rod pivoted at one end on said wrist pin and pivoted at its other end to the crank arm, said connecting rod effecting combined longitudinal reciprocation and rotary oscillation of said piston when the crank shaft is turned. a

3. In a fluid pump, the combination of a cylinder, a piston, a crank shaft, a connectlon between said piston and crank shaft adapted upon rotation of the crank shaft to effect combined longitudinal reciprocation and rotary oscillation of said piston, air inlet and outlet ports for said cylinder and air passageways cut in said piston for cooperating with said ports to control the inflow and outflow of air, a closed crank case whereby air will be compressed in said case during in-stroke of the piston, means connecting said crank case with the cylinder at the end of the in-stroke of the piston whereby air compressed in the crank case may flow into the cylinder, the air in said crank case being expanded during out-stroke of the piston, an atmosphere vent hole for said crank case, said vent hole being closed during the greater part of the movement of said piston, and a channel cut in said piston for cooperating with said vent hole after a period of outward movement of said piston to connect the crank case with atmosphere. 4. In a fluid pump, the combination of a cylinder, a piston within said cylinder and crank shaft at right angles to said piston, said cylinder having an inlet at one side and an outlet at the other side and said piston having channels cut in its face to cooperate with said inlet and outlet, a crank arm on said crank shaft, and a connection between said piston and crank arm adapted upon rotation of said crank shaft to effect combined reciprocation and oscillation of said piston durlng which movement said piston channels cooperate with the inlet and outlet to control the flow to and from said cylinder.

5. In a device of the class described, the combination of a casing and piston forming a plurality of compression chambers, means operable to eflect a relative composite recip rocal and rotary movement to the piston for enlarging and diminishing said chambers,

' ton, a port control ed by the and ports controlled by such composite movement tointroduce and compress a charge in one chamber and transfer and further compresssaid charge in the other chamber and exhaust same fromthe latter chamber.

6. In a device of the class described, the combination of a casing and piston forming a plurality of'compression chambers therethereafter supplement said charge by an auxiliary charge expressed from the other chamber and thereafter compress and expel the combined charge from the first men:

tioned chamber.

7. In a device of the class described, the combination of a cylinder and crank case, a piston in the cylinder providing pressure chambers in the cylinder and crank case, a crank in the crank case connected with the piston to simultaneously reciprocate and oscillate the piston, and thereby enlarge and diminish the pressure chambers in the cylin der and crank case, and ports in the wall of the cylinder controlled by the combined reciprocation and oscillation of the piston so as to admit preliminary charges in both the crank case and cylinder chambers, compress and transfer the charge in the crank case chamber to the cylinder chamber, and compress and discharge the combined charge from the cylinder chamber.

8. In a device of the class described, the combination of a casin comprising a crank case chamber and a cyllnder chamber, a piston therebetween, means in the crank case connected with the piston for simultaneously reciprocatin and oscillating the pispiston so as to temporarily. open when the iston is projected outwardly in the cylin er and admit a charge to the crank case and close as the piston begins moving inwardly toward the crank case, so as to compress the charge in the crank case, an inlet port controlled by the piston and adapted to open as the piston moves inwardly toward the crank case and admit a charge into the cylinder chamher and close thereafter to permit compression of the charge in the cylinder chamber,

a by-pass controlled by the piston so as to transfer the compressed charge in the crank case chamber to the cylinder chamber after the closing of the inlet port to the cylinder chamber and previous to the operation of the piston for compressing the charge in the cylinder chamber, and an exhaust port controlled by the piston for exhausting the combined charge from the cylinder chamber during compression.

tively long period of inlet communication 9. In a device of the class described, the

combination of a casing having a crank case chamber anda cylinder chamber, a piston therebetween, means in the crank case connected with the piston for imparting combined reciprocatory and oscillatory movement to the piston, an inlet to the crank case for admittin a charge so as to be compressed thereln by the piston, an outlet from the cylinder chamber for exhausting a charge compressed therein, and a by-pass controlled by the combined reciprocatory and oscillatory movement of the piston to communicate the compressed charge from the crank case chamber to the cylinder chamber previous to compression in the cylinder 0 amber.

10 In a device of the class described, the combination of a casing'having a crank case chamber and a cylinder chamber, a piston therebetween, means in the crank case connected with the piston for reciprocating and oscillating the piston, and inlet and outlet ports controlled by the reciprocation and oscillation of the lston to afford a comparawith the cylinder chamber during the intake stroke, and to afford a comparatively short period of outlet communication from the cylinder chamber as the piston nears the end of the compression stroke.

11. Ina device of the class described, the combination of a casing comprising a crank case chamber and a cylinder chamber, a piston therebetween, a rotatable crank in the crank case, an angular connecting rod having one arm connected with the piston "and the other arm extending laterally from CHARLES A. ANDERSON.

Images