US1550972A - Measured-quantity-control device - Google Patents

Description

' Aug. 25, 1925. 1,550,972

. w. u.. LAUDAN MEASURED QUANTITY CONTROL DEVICE Filed July 31. 1924 2g .My l.

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Patented Aug. 25, 1925. I

UNITED STATES' issuers PATENT OFFICE.

WILLIAM L. LAUDAN, 0F STERLING, COLORADO.

MEASURED-QANTITY-CONTROL DEVICE.

Application filed July 31, 1924. Serial No. 729,380.

To all whom 'zit may concern:

Be it known that I, WILLIAM L. LAUDAN, a citizen of the United States, residing at Sterling, county of Logan, and State o-f Colorado, have invented cert-ain new and useful Improvements in Measured-Quantity Control Devices; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to a predetermined-- quantity control device or pump, which is operated by the varying pressure within a chamber, and which delivers liquid in measured quantities to any desired place.

It is the object of this invention to produce a simple device that can be connected to the explosion chamber of an internal combustion engine or to the cylinder of an air compressor, which will function as a pump for transferring a liquid or other fluid from one container to another.

Another object of this invention is to produce a device that shall be adapted to transfer lubricating oil from an oil cup to the inside of an engine or air pump cylinder in Such a manner that oil willenter constantly in measured quantities, ,thereby assuring constant lubrication.

Many attempts have been made to properly lubricate the cylinders of air compressors. With the exception of some complicated force feed mechanism, however, no satisfactory lubricating device for air compressors has been discovered.

My invention can be most clearly de scribed and will be most readily understood when reference is had to the accompanying drawing, in which the preferred embodiment thereof is illustrated, and in which:

Fig. 1 is a diagrammatic, sectional View showing my `improved pump attached to an internal combustion engine or air pump cylinder;

Fig. 2 is a view showing the device connected to an air pump or engine for delivering lubricating oil to the same;

Fig. 3 shows my device applied to an oil cu gig. 4 shows an oil cup provided with a slightly modified form of my invention; and

Fig. 5 is a section taken on line 5 5, Fig. 2.

Numeral 1 designates a cylinder and 2 the reciprocating piston, whichl is operatively associated therewith. A pipe 3 is connected with the cylinder and extends to the pump s. This pump consists of a body member 5 having two spaced, preferably parallel openings 6. These openings have their ends 7 of somewhat larger diameter at the point where the opening 6 connects with the openings 7. Annular shoulders 8 are formed, which are preferably chamfered or inclined so as to form valve seats. The upper enlarged chamber 7 on one side is connected to the lower enlarged chamber 7 on the other side by a channel 9. Seated within each opening 6 is a double ended valve having valve portions 10 connected by a stem 11. The valve portions l0 are adapted to cooperate with the seats 8, but the stems l1 are of such length that only one valve .can seat at a time. The stems are also of` smaller diameter than the openings G so that liquid can flow through the opening while the stem is in place. In order to permit `the valves to be assembled in the manner shown, the stems are made in two parts and threadedly connected. Plugs 12 are threaded into three of the chambers 7. The plugs in the upper chambers have adjusting screws 13 associated therewith. These screws engage a cup 14, against which the upper end of the spring 15 abuts. Vhen it is desired 4to increase the tension of the springs, the screws 13 are turned inwardly. This compresses the spr' g so that it requires greater force to unseat the valve. ik pipe 16 leads to the supply 17 and a second pipe 18 leads to the reservoir 19.

It is evident that if the piston 2 moves downwardly there will be a diminution of pressure within the cylinder. When the difference in the pressure within the cylinder and that of the circumambient air becomes sufliciently great, it will raise the valve 10 on the left of the pump (Fig. 1) and permit liquid to flow upwardly into the upper chamber 7. As the suction and the flow of liquid increases, the valve will close against the lower seat, which, of course, stops the flow. -When the piston returns, it will compress the fluid in the cylinder, but before any compression takes place, the pressure will approach atmospheric. At some point between the condition of suction and compression within the cylinder, the spring 15 moves the valve to `the position shown in the drawing. Vhen the pressure becomes sufficiently great the fluid or liquid will unseat the valve on the right (Fig. 1) and enter the pipe 18. As the pressure within the cylinder changes from below the above atmospheric, the above operation will be repeated, with the result that a liquid will be transferred from 17 to 19. It is evident that until there has been sufficient oil raised from the supply 17 to till the passage 9 and associated chambers 7 that pressure should not be admitted, since it will only cause air to enter the pipe 1S. At the same time, it the liquid should enter the pump faster than it can leave it, the liquid would soon accumulate and enter the pipe B. To prevent this, I have provided a 'float chamber 20 directly above the pump 4l..

This chamber contains a float 2l., which controls two valves 22 and 23. Then the iioat chamber is empty, the valve 23 is closed, but when it is full the valve 22 is closed, while at some intern'iediate point both valves are open. The float operates to prevent air under pressure 'from entering the pump until the latter has been completely filled and the liquid has risen suliiciently in the float chamber to raise the float. It', for any reason, more liquid should be sucked into the pump than can leave, then the {ioat will finally rise sufliciently to close valve 22, which will effectively prevent more liquid 'from entering until the level in the iioat chamber has fallen. The ioat will therefore serve to keep the pump full ot' liquid at all times and to prevent liquid from entering the cylinder. Although I have shown the valve in the righthand opening 6 as a double one, this is not absolutely necessary, as the lower valve portion may be dispensed with without changing the operation to any great extent. It the riglrthand valve is single instead of double, there will be very little danger of liquid accumulating in the pump.

Vhen my device is to be used for supplying a lubricant to a cylinder, a somewhat simpler device than that described may be employed. This simpliied device is shown in Fig. 2, in which the pump is indicated by numeral 4A. The part 5 may be a cylindrical bar provided with a central axial opening 6A having enlarged chambers 7A at its ends. The pump has only a single double ended valve member, which is constructed and which functions exactly like the one shown on the right of the pump in Fig. 1. The parts have been designated with the same numerals as corresponding parts in Fig. 1, each numeral having an A attached to indicate that they represent specifically different parts.

When the portion 2 reciprocates, it produces a suction on its downward stroke. This causes oil to iow from the supply 17. Only a limited amount of this oil will pass the valve on each stroke, as the valve seats against the lower valve seat a short interval ot time after it opens. The length of time the passage past the valve is open depends somewhat upon the length of the valve and the tension of the spring 15, one or both of which must be altered until the desired results are obtained.

ln Fig. 3 l have shown my improved pump incorporated into an oil cup, which has a cup portion 2st having an internally threaded downwardly projecting nipple 25 that is connected to the cylinder 1 by means ot a pipe 2G. The cup has a cover 2T provided with an opening 28. Within the cup .l place my improved control device consisting of a body member 29, which has a tubular threaded end 3() that is threaded into the nipple 25. The opening 31 is connei-ted by means ot a transverse opening with the enlarged chamber 33, which is connected by an opening 34 with a second enlarged chamber 35. The shoulders at the ends oi the opening 34; are provided with beveled valve seats 36, which cooperate with a double ended valve constructed like those previously described. A screen 37 closes the end ot' the chamber 35 and prevents dirt from entering. The action of this device is exactly the same as explained in connection with Fig. 2.

ln Fig. 4 l show a slight modiiication. In my control device is incorporated the part :38 that conne-cts the nipple 25 with the cylinder. Member 38 is constructed almost exactly like that shown in Fig. 2 and dit ters from it principally in this, that the spring 39 is under tension instead of under compression. The upper end of the spring is connected to a threaded pin 40 that passes through a support 41 that. is threadedly secured to the end of member 38. A nut 4:2 cooperates with the pin 40. This device operates in precisely the same way as those shown in Figs. 1 and 2 and differs merely in this, that the spring is under tension instead of under compression.

Although I have described the above invention as being particularly adapted for use in connection with the lubrication ot air compressors and have employed language that might imply that there mustbe a variation in pressure which changes from above to below atmospheric, I want it understood that my device may be used in connection with steam engines both of the condensing and uncondensing type, as the only requirement is that the pressure in the supply reservoir 17 shall be greater than the minimum pressure in the cylinder so that oil Will flow upwardly through the check valve opening on the left (Fig. l).

It the supply reservoir is subjected to pressure, the tension ot the spring will have to be suliicient to hold the valve seated in spite of the same.

It will be apparent from the above description that I have invented a simple device that is especially well adapted to 1ubricate the cylinders of air compressors and other machines where there is a chamber which is subjected alternately to pressures above and below atmospheric. When my device is constructed in the manner shown in Fig. l, it can be used for a variety of purposes, but is especially well adapted tor use in connection with internal combustion engines for circulating oil and can be substituted Jfor the ordinary oil pump. In connection with automobile engines having a splash Voiling system, my device can-readily be applied for the purpose oit' producing a positive circulation of oil, which will prevent damage in case the gravity circulation shall become inoperative for any reason.

l/Vhen constructed as shown in Figs. 3 and 4l the oil cups may be attached directly to an engine cylinder as readily as any simple oil cup and will provide positive constant lubrication.

Having now described my invention, what I claim as new is:

1. A pump tor transferring liquid, comprising, in combination, a body member having two spaced openings having portions thereof of different diameters, a pair of spaced valve seats formed in said openings at the point where the diameters change, a valve member for each of said openings, said valve members being each provided with two spaced valve portions adapted to cooperate with said valve seats, said valve being of such length that it can contact with only one valve seat at a time, resilient means associated with each valve member for normally holding a valve portion against one of said valve seats, and means for connecting the enlarged portion of each of said openings containing respectively the normally open and the normally seated valve, with a chamber having a pressure variation from belo-w to above atmospheric.

2. A pump for transferring liquid, comprising, in combination, a body member having two spaced openings having portions thereof of different diameters, a pair of spaced valve seats formed in said openings at the point where the diameters change, a valve member for each of said openings, said valve members being each provided with two spaced valve portions adapted to cooperate with said valve seats, said valve being of such length that it can contact with only one valve seat at a time, resilient means associated with each valve member for normally holding a valve portion against one of said valve seats, and means tor connecting the enlarged portion of each of said openings containing respectively the normally open and the normally seated valve, with a chamber having a pressure variation from below to above atmospheric, said means comprising a float valve adapted to close one of two openings.

In testimony whereof I atlix my signature.

WILLIAM L. LAUDAN.`

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