US2561280A - Oscillating piston meter - Google Patents

Description

July 17, 1951 E KAMPF 2,561,280 7 OSCILLATING PISTON METER Filed Dec 2'7, 1946 INVENTOR za rrq E H f ATTORNEY Patented July 17, 1 951 OSCILLATING PISTON METER Harry E. Kampf, Manhasset, N. Y., assignor to Neptune, Meter Company, a corporation of New Jersey Application December 2'7, 1946, Serial No. "718,669

'7 Claims. 1

This invention relates to fluid meters of the oscillating piston type. The invention more particularly relates to an improvement in the means cooperating with the oscillating piston for preventing leakage of the fluid by the operating parts from the inlet to the outlet of the meter. Oscillating piston meters conventionally are constructed with a casing providing a cylindrical chamber and a pair of cover plates constituting walls of the casing transverse to the axis of the cylindrical chamber. In order to provide for the typical oscillating movement of the piston in such meters, means are provided for confining a piston of cylindrical form to move so that its axis revolves about the axis of the cylindrical chamber, an edge portion of the cylindrical piston being also confined to move substantially in a rectilinear path inwardly and outwardly toward and away from the axis of the cylindrical chamber to produce the concomitant oscillating movement of the piston. In many conventional designs the means for confining the piston to revolve about the axis of the cylindrical chamber takes the form of a body concentric with the cylindrical chamber and providing a cylindrical surface with which a roller or pin carried by the piston engages, A significant feature of such oscillating piston meters also is that a partition is inserted between the inlet opening and the outlet opening of the meter which conventionally extends from the cylindrical wall of the casing toward the axis and ordinarily abuts a transverse wall between the two openings, as well as abutting the central body which provides the cylindrical guide surface, to provide fluid-tight joints with these casing walls and with the body to prevent leakage of the fluid by the partition from the inlet opening to the outlet opening.

In many conventional designs, such as that shown in the patent to C. S. Hazard, No. 1,961,688, June 5, 1934, a slot is cut in the periphery of the cylindrical piston and extends toward the axis thereof in the web of this piston to provide for cooperation of the piston with the partition wall to secure the requisite sliding movement of the piston inwardly and outwardly along the wall. The form of the slot and the provision of auxiliary devices in some designs are intended to limit so far as possible leakage past the partition wall. When the parts of such a meter are accurately made a high degree of accuracy of measurement is obtainable because of the peculiar form of the slot which provides for the oscillating movement by virtue of the combined movement of revolution about the axis of the chamber and of translation along the partition wall. To secure the desired limitation of leakage, however, skill and care are required to produce the requisite fit of the parts. Neverigleless, because of the oscillating movement of the piston, the edges of the slot at the portions thereof which are intended to engage the faces of the partition must be spaced somewhat so as to provide a certain amount of play. Because of the reciprocating action of the piston within the casing this play introduces a certain amount of slap when reversal of the movement of the piston takes place transversely of the partition, bringing one or the other edge of the slot adjacent the periphery of the piston cylinder suddenly into contact with the corresponding face of the partition.

In order to reduce the leakage in an oscillatingpiston meter of this type it has been proposed heretofore, as shown in the patent to Nash, No. 300,628, June 1'1, 1884, to provide a tongue or blade in slidable edge-to-edge contact with the partition, this tongue being pivotally connected to the piston so that as the peripheral portion of the piston moves along the partition the blade will move in a direction generally parallel to the partition inwardly and outwardly toward and away from the axis of the cylindrical casing. In this device of the prior art, however, although its purpose is to secure a leakage resisting contact of the sliding surfaces no provision has been made to prevent the slap above referred to due to the play of the piston with respect to the partition. In this device reliance is placed, as in that of the patent to Hazard, No, 1,961,688 upon the engagement of the edges of the slot at the periphery of the piston with the face of the partition to provide the guiding movement of the piston inwardly and outwardly as the axis thereof revolves about the axis of the cylindrical casing.

It is an object of the invention to provide an improved means for guiding the oscillating piston of an oscillating piston meter.

It is another object of the invention to provide guiding means for the oscillating piston which will greatly reduce or substantially eliminate the slap of the piston upon reversal of the movement thereof.

It is another object of the invention to provide for the elimination of slap concomitantly with improving the resistance to leakage of the fluid by the operating parts between the inlet and outlet openings of the meter.

It is a still further object of the invention to provide an improved guiding means for an oscillating piston meter capable of being manufactured at relatively low cost and requiring only ordinary manufacturing accuracy.

It is an additional object of the invention to provide such improved means for guiding the piston and for resisting leakage in an oscillating meter which is otherwise constructed in conventional form.

It is a feature of the invention that means are provided associated with a blade or tongue slidable in relation to the partition and in relation to the casing for preventing slap and insuring rectilinear movement of a portion of the piston adjacent the circumference thereof along the partition. The invention utilizes a blade pivotally connected to a piston and oscillatable with respect thereto on an axis fixed in relation to the piston, the blade being arranged in edge-toedge relation to the partition and for movement substantially in the plane thereof. This blade slidably engages in leakage resisting contact the partition as well as a wall of the cylindrical casing transverse to the axis thereof. It also engages the cylindrical wall in such leakage resisting contact. In accordance with the preferred embodiment of the invention the blade may be connected to a pivot member of cylindrical form fitting in a cylindrical recess in the piston adjacentthe periphery thereof, the axis of this cylindrical recess being parallel to the axis Of the cylindrical piston. Leakage of the fluid between the cylindrical .pivot member substantially is prevented by properly fitting the pivot member to the recess for pivotal movement therein.

In order to provide for rectilinear movement of the pivot member and the pivotal axis there-- of along the partition, guide shoes are provided connected to the pivotal member or forming a part thereof and adapted for sliding engagement withthe faces of thepartition. These guide shoes preferably are fixed in relation both to the blade and to the cylindrical pivot member, or all these parts may be of unitary form, so that oscillating movement of the piston on said pivotal axis may take place relative to said pivot member, said blade-and said shoes. Thus, the piston may oscillate-with respect to thepivot member and to the guide shoes and to the blade as these parts and the piston move together inwardly and outwardly along the partition. As the partition and the parts engaging this partition may be formed with plane surfaces and these parts may be readily fitted together with the plane surfaces in contact with each other, the cylindrical surfaces fitting in contact with each other, as above described,such sliding and oscillating movements Of the pistonare accomplished without slap and without detrimental leakage of the fluid by the partition and by the cylindrical pivot member and the piston. The fit of the parts in sliding and oscillating relation, however, need not be of *greater' accuracy than is requisite for the manufacture of the conventional meter. Moreover, the construction is such that the parts which are utilized for the improvement of the invention may be thus manufactured so as to be interchangeable and if wear occurs replacement may be easily and simply made to maintain the fit and the accuracy of the meter.

Other objects and features of the invention will appear from the description of the drawings to follow.

Fig. 1 shows a plan view of the operating parts withinthe casing of an oscillating meter with a portion of the. piston broken away and with one cover of the casing removed;

Fig. 2 shows a section on line 2-2 of Fig.2;

Fig. '3 shows theblade and guide shoes of the invention with relation to the partition of an oscillating meter;

Fig. .4'show's a horizontal section of an oscillating r'ne'te'r embodying a modification of the invention;

Fig. is a section on line 5-5 of Fig.4;

Fig. 6 shows'a mcdifiedform of the blade and guid'e'means of the invention.

In Figs. 1 and 2 is. shown the assembly I of the operating parts of an oscillating meter having'a'cylindrical casing 3 and'covers 5 and 1 providing walls transversely of the axis of and fast'enedby suitable means to the cylindrical "casing 3. This fastening may be accomplished by machining or otherwise forming the covers 5 and 1 with shouldered flanges 9 and H to fit to the casing 3 in fluidtight contact. The cover 5 is provided in the conventional manner with a port l3 separated from a second port l5 by a portion I! of the wall of the cover 5. The ports I3 and I5 provide the inlet and outlet openings for the fluid introduced into the chamber formed by the casing 3 and by the covers 5 and l, which fluid in its movement from the inlet port to the outlet port impels the cylindrical piston IE] to move with its axis revolving about the axis of the cylindrical casing 3 while being guided adjacent the periphery of the piston by means, as hereinafter described, to move preferably radially inwardly toward and outwardly from the axis of the cylindrical casing 3 to secure the characteristic oscillating movement of the piston to accomplish the requisite uncovering and covering of the inlet and outlet ports.

As shown in Fig. 2 a body 2| is fastened to the cover 5 by means of screws 23 tapped into the wall of the body 2|. The body 2| preferably is of cylindrical form providing an exterior cylindrical surface 25 and an interior cylindrical surface 2? concentric therewith. The coincident axes of the cylindrical surfaces 25 and 2'! preferably coincide also with the axis of the cylindrical casing 3. The cover 5 and the face of the body 2| adjacent thereto are finished to provide for fluid-tight contact of the .body 2| with the cover 5. The annular face 29 of the body 2| opposite to the cover 5 is formed transversely of and preferably perpendicular to the common axis of the casing 3 and of the body 2| and is spaced from the inner surface 3| of the cover 1, this surface 3| preferably also being formed perpendicular to the common axis. The piston is is provided with a web 33 having parallel surfaces perpendicular to the axis of the piston and in leakage resisting contact with the annular surface 29 of the body 2| and the inner surface 3| of the cover The piston is formed with a wall 35 surrounding a hollow space and providing concentric cylindrical " surfaces 47 and 49. The annular surface 3'! of piston l9 bears against the inner face of the cover 5 which is formed perpendicular to the axis of the casing 3.

Fastened in web '33 of the piston |9 concentric with the axis of this piston in a conventional manner is a stud- 2f projecting axially outwardly to provide for engagement with the registering device of the meter. Fastened in the end wall of the body .21 and in the cover 5 is a pin 43 with its axis coinciding with the axis of the casing 3. This pin :33 supports a roller 85 rotatable thereon and of such diameter with respect to the diameter of the stud M as to be continuously in contact with the stud 4| as the piston is revolves about the axis of the casing 3 and of the pin A 3. The diameters of the external cylindrical surface ll and of the internal cylindrical surface d9 provided by the wall 35 of the piston I!) are such that the inner surface 69 bears upon the outer surface '25 of the body 2| as the outer surface ll of the piston bears upon the inner surface of the cylindrical casing 15 to provide leakage resistingcontact of these surfaces as the piston revolv'es about the axis of the casing 3. The stud ll, being in contact both with the roller and the inner surface '27 of the body 2|, maintains the contact of the surfaces El and A9 of the piston respectively with the'casing 3 and the body 2| as above mentioned for all positions of the piston IS. The elements of the fluid meter having an oscillating piston thus far described are of generally conventional form.

The meter of the invention also is provided with a partition 5| which in the embodiment of Figs. 1 and 2 is fitted in a conventional manner in fluid tight engagement with a slot or recess 53 in the exterior surface of the body 2|. This partition 5| also engages the portion ll of the cover 5,-being fitted fluid-tight in the slot 55.formedin this portion IT. The partition 5| at the edge thereof opposite to the recess 53 also engages a slot 5'! in the casing wall 3 in fluid-tight engagement therewith. The edge 59 of the partition 5| opposite to the recess 55 is parallel to and spaced from the inner surface 3| of the cover 1 preferably a distance equal to the thickness of the web 33 of the piston between the surface 3| of the cover 1 and the annularsurface 29 of the body 2| in order that the inner surface 32 of the web 33' of the piston may slidably move in leakage resisting contact with this upper edge 59 of the partition 5| as this inner surface of the web 33 slidably moVes in contact with the annular surface 29 of the body 2| in the movement of the piston inwardly and outwardly with respect to the axis of the casing.

To provide against leakage of the fluid between the inlet port and the outlet port past the partition 5| while at the same time accommodating for the inward and outward movement of the piston which produces the requisite oscillation thereof, a blade 6|, which may be of the same thickness as the partition 5| and of the same depth as the thickness of the web 33 of the piston, is supported for slidable movement radially with respect to the casing 3 inwardly and outwardly along the partition with one edge of the blade in contact with the edge surface 59 of the partition and the other edge of the blade in contact with the inner surface 3| of the cover I. This blade is pivotally supported in the piston on an axis adjacent the circumferential surface 41 thereof. In the embodiment of Figs. 1 and 2 a cylindrical pivot member 63 is rotatably fitted into a cylindrical recess 65 formed in the wall 35 of the piston with the axis of the cylindrical recess parallel to the axis of the piston. The pivot member 63 is fastened to or formed as part of the blade 6| so that this blade and pivot member as a unit may pivotally move in the cylindrical recess relative to the piston l9. It will be apparent, therefore, that as the piston moves to revolve its axis about the axis of the cylindrical casing 3 the piston also may oscillate with respect to the cylindrical pivot member 53 and the blade 6| if this blade is confined to move along the length of the partition 5| and thereby to move the pivotal axis of the blade and the portion of the piston in which the axis is positioned radially inwardly and outwardly toward and away from the axis of the cylindrical casing to secure the characteristic action of the oscillating piston meter.

In order to secure the requisite radial movement of the pivotal axis or axis of oscillation of the piston along the partition 5| the pivotal member 63 15 provided with guide shoes or legs 61 which extend transversely of the blade 6| and provide contact surfaces in the shoes 6! slidably engaging the faces of the partition 5|. In the particular embodiment of Figs. 1 and 2 the legs 61 are shown as extensions of the cylindrical pivot member 63 providing therebetween a slot containing the axis of the pivotal member and extending from the free ends of these legs toward and to meet the surface of the blade 6| which makes contact with the surface 59 of the partition 5|. The inner end of this slot is formed as a continuation of this contact surface of the blade 6| so as to maintain the leakage resisting contact of the blade and of the pivotal member 63 with the upper surface 59 of the partition in all positions of the blade and pivotal member along the partition. In the particular embodiment of Figs. 1 and 2 also the blade 5| passes through a slot 69 formed in the casing 3 to provide leakage resisting contact of the blade 5| with this casing wall. The blade 6| is of such length as to extend into the slot 69 to afford such contact with the casing wall when the pivot member 63 is in the position at the end of its movement adjacent the cylindrical body 2|. When this pivotal member is at theopposite end of its movement it will be apparent the blade.

willzproject outwardly of. the casing 3. The parts shown in Figs. 1 and 2 ordinarily are con,- tained within an exterior meter body which may be suitably designed to provide room for the projection of the blade 6|. 1

In order to accommodate the oscillating move,- ment of the piston IS with respect to the cylindrical pivot member 63 and the-shoes B'Iextending therefrom and to avoid interfering with the full movement of the inner surface 49 of the piston I9 into contact with the exterior surface 25 of the body 2| as the piston reaches the end of its movement inwardly along the partition,

the cylindrical surfaces of the pivot member 63 and of the shoes 61 are truncated as shown at H in Fig. 3. Similarly, these cylindrical surfacesare truncated at 12 and 13 as shown in Fig. 3 at either side of the blade 6| in order to. avoidinterference with the full movement of the exterior surface 4'! of the piston l9 into contact with the inner surface of the cylindrical casing.

3 when the piston moves outwardly along the partition 5|. This truncation of the pivot member 53 and the shoes 61 in this particular embodiment is necessary because the diameter of the pivot member and of the shoes is greater than the thickness of the wall 35 of the piston. Such provision may be necessary inaccommodating the device of the invention to oscillating meters of conventional construction in which the thickness of the cylinder walls 35 is not sufficientto accommodate a pivot member having a diameter large enough to provide a good bearing surface in the cylindrical recess 65 for the cylindrical member 63 and, as well, to provide substantial thickness for the legs or shoes 61 and adequate fiat bearing surfaces in these shoesfor contact with the faces of the partition 5|.

In the embodiment of the invention illustrated in Figs. 4, 5 and 6 the construction is generally similar to that of Figs. 1 and 2, like parts carrying like reference numerals. bodiment, however, the piston I9 is formed with the wall 35 thereof of greater thickness than that of the embodiment of Figs. 1 and 2, this. thickness in this particular embodiment being substantially equal to the diameter of the pivot member 15 of cylindrical form which is pivotally supported in a cylindrical recess 11 formed in the wall 35 of the piston l9. In the embodiment of Figs. 4, 5 and 6 the partition 5| extends from the recess 53 in the central body 2| through the wall of casing 3 without making contact with this wall. The outer end of the partition 5| is fitted in a recess 19 provided in the wall of a bulge 8| In this em- 2,5131 ,aeo

formedupon the exterior of the casing 3.. The

partition 5|, as in the embodiment :of. Figs- 1.

and 2, engages a recesstE in the .portion ill of the cover 5; this cover having a portion B3 extending outwardly to. cover. the chamber enclosed by thewall of. the bulge 8!. The cover I also has aportionst which extends outwardly to cover this chamber oppositelyto the: portion 33- of the cover a.

The embodiment ofFigs. 4 and 5 utilizesa combined blade and guide memberfll, Fig. 6,.in which the blade may be formed integrally with .thepi-vot.

member 15 and withguide shoes 89 extending downwardly from the blade .88 for thefull length.

of the blade outwardly from the pivot member 1'5. Between the shoes 89 thereis 'providedsa slot 91 extending fully through the member 81 parallel to the blade 88 and inthe plane of the.

axis of the pivot member 15. Theinner faces. of the shoes 89 are spaced .apartby thisslotso as to bear in contactwith the faces'ofithe partition5l for the full extent of the length. of the blade 88 to guide the guide member and'the blade and the pivotimemberfor.movementin the'plane of the partition 5|. The length of the .partition 51 and the extent of the bulge 8| outwardly from "the casing 3 are such thatwhen the piston is moved to the position in which the pivotal member 15 is adjacent the wall of the casing 3 the end. of the blade 88 and the end edges of thei-sho'es. 89 project almost to but do. not reach the; wall of the bulge 81. blade 88 and of the shoes89 along the partition also is such that the end edges of these members do. not pass within the casing 3 when the piston moves inwardly of the casing and the pivotalmember I5 is'adjacent the cylindrical body 21. It will be apparent that the blade 88 and the pivotal axis of the pivot member 15 are guided for rectilinear movement along the partition 51. Asthis axis is positioned in the wall 35 of the pieton Hi this portion of the wall 35' is given rectilinear movement inwardly and outwardly of the axis of the casing 3 between the extreme positions of the piston. The shoes 89 being of substantial extent lengthwise of the partition to insure the rectilinear .m'ovement of the axis of. the pivotal member 75 also insure the correct" kinematic action of theyperipheral portion of the piston to secure the requisite oscillation thereof as-the axis of the piston revolves about theaxis of the cylindrical casing 3 without play or lost.

motion between the cooperating parts.

In order to accommodate :for the oscillating movement of the piston relative to the guide member 81' the wall 35 of the-piston is relieved slightlyat. both the inner cylindrical surface and the outer cylindrical surface thereof, as shown in Fig.

4- adjacent' the. surface of the. cylindrical. recess H. It will be understood that only such relief is necessary as to prevent engagement of the edge of the piston wall with the partition '5l I or with the. outer surface of .theshoesv 89 as the piston oscillates in. its movement within the. casing '3.

It will be understood that the upper surface 93. of the blade 8-8, Figs. 5 and 6, moves in. sliding.v

leakage resisting contact with the under face of the cover I in the same manner as described'inconnection with Figs. 1 and 2, the under surface 950i this blade similarly making contact with the upper edge surface 59 of the partition 51.

The. wall 3, as shown in Fig. 4-, provides an open-' ing' 91 for passage therethrough of the member.

81. The edges of the wallat the opening-91 are formed to bear. against shoes 89 to provide. leakage resisting contact therewith. It will be understood, since the shoes:

89 cooperating with thexpartition '51 serve to guide the .pivot'inember 15; that is, theaxis thereof which iswpositioned in thewa'll '35 of the piston-19 inwardly and outwardly in theplane of the partition, that is; radially of the. casing, that. the wall 3 of the casing is not required tov serve.

forguiding the blade :as is the case in'the embodiment of Figs 1 and 2. The contact of theshoes 89 with the edges of the casing wall 3 serves merely to prevent leakage of the fluid into the chamber of the bulge 8| where it may pass-around the-edge of'thepartition. While-in the preferred embodiment this contact may be. accomplished by fitting of :the surfaces of the shoes. which ordinarily would be made of metal, to the-metallic wallv of the casing,,-within.the

1 :scope of the invention, if desired, other means for preventing leakage between the shoes and the casing maybe adopted.

The operation of thefi uid meter of the invention isqgenerally the same as that of conventional mete-rs. The 'iluid entering through one of the ports, for example the port it, fills thechamber at the left of the piston in Fig. :1 and'at the .left of partition 5! and of the blade ill cooperating therewith in the position of the piston as shownin this figure. As the outlet port 15' is uncovered by the piston the fluid in thechamber formed within the casing at the right of the piston and at the right of the partition 51 and of the blade BI be discharged. through the opening t5. The pressure attire left of the piston is effective to move the oscillating piston, that is, the'axis ofthe stud 4lin the counterclockwise direction about the axis of the casing and of thepin l3. Thus, in Fig. 1 the pivotal member 63 and the peripheral portion of the piston have started to move outwardly along the partition and such movement will continue until the outer circumference of the-piston substantially is tangent to the inner cylindrioal'surface of the wall 3 of the casing adjacent the partition.

When the piston has reached this uppermost positionxin Fig. lithe inletjport l3 communicates.

with the space within the piston and the inner surface of the wall 35 bears upon the 'outerzsurface of thebodyfil toprevent passage of the'fiuid.

to the outlet port 5.5. The fluid pressure acting at the inside of the piston between the wall 35 thereof and the-body 21 will causethe piston to pivet'on-the pivotal'member 6-3 swinging towardthe left in Fig. -l., the stud l-l continuing to movecounterclockwise about the axis of the pin 4.3.

This pressure "continues .to act as .the piston :is.

moved-downwardly until the port l3 again is .uncovered at the'outer side of the piston. Theepress sure of the fluid then is brought upon-the outside ofithe piston .to continue the movement. The port l5; then becomes uncovered at the 'insideof the piston for discharge ofthe fluidwithin the piston through this outlet port. The-fluid at the. outside ofithev piston previously admitted through the port is discharged-through the part I 5 as the pistoncontinues-'itsmovement through the position shown .in-l ifl. 'luntil :the piston again :is

in upper tangent position.

it will apparent from the above description that the invention provides simple :means -forpre venting leakage past the partition, utilizing preferably devices which maybe-machined by ordinary methods to --cylindr ical and plane surfaces for securing the-leakage resistingcontact ofsuh the. .outer faces of the surfaces where relative movement therebetween secure the proper fit of the surface of the blade BI and the edge surface 59. Not only is the essential resistance to leakage thus secured but the undesirable and in many cases detrimental action which results in slap of the piston upon reversal thereof is avoided by virtue of the improved oscillating axis guiding means of the invention.

Within the scope of the invention the form and construction of this unitary element which provides the pivot, the leakage preventing blade and the guide shoes may be varied while retaining the essential features of securing rectilinear move- -ment of the pivotal axis along the partition, that is the movement of the axis of oscillation of the piston for correct kinematic action thereof within the casing, concomitantly with providing against leakage of the fluid by the partition from .the inlet of the meter to the outlet thereof. The

unitary element of the invention is adapted'to be made of different materials suitable to the purpose for which the meter is designed and for low cost of manufacture with accuracy consistent with the accuracy of the conventional parts of the oscillatingpiston meter to which the invention is applicable. All such variations and modifications of the invention are intended to be within the scope of the claims appended hereto.

The term oscillating piston as used in the claims designates a member supported within a casingfor revolution of a central point thereof about an axis of revolution, a point adjacent the periphery of the member being confined concomitantly to move in reciprocating movement inwardly toward and outwardly away from the axis of revolution.

I claim:

1. In a fluid meter, the combination with a casing providing a chamber having a cylindrical wall and a wall transversely of said cylindrical wall, a cylindrical oscillating piston within said chamber, means for confining said piston for movement of the axis thereof about the axis of the cylindrical chamber while maintaining said axes parallel and the circumference of the piston in contact With said cylindrical wall of the casing, said casing having in said wall thereof transverse to the axis of the cylindrical chamber a fluid inlet opening and a fluid outlet opening spaced ciroumferentially about the axis of said cylindrical chamber, and a partition extending from said cylindrical wall of said chamber toward the axis thereof and abutting said transverse wall and cooperating with said confining means and said transverse wall to provide substantially fluid tight joints therewith, of a bladesupported for movement thereof substantially in the plane of said partition inwardly and outwardly toward and away from the axis of said cylindrical chamber, said blade cooperating with said partition and with a transverse Wall of said casing to provide leakage-resisting contact therewith, a pivot member rigidly connected to said blade for engaging said piston adjacent the circumference thereof for pivotal movement of said piston with respect to said blade, and means rigidly connected to said blade adjacent the pivotal axis of said 10 pivot member'and engaging said partition for guiding said pivotal axis and said piston to move inwardly and outwardly along said partition as the axis of the cylinder of said piston is moved about the axis of said cylindrical chamber.

2. In a fluid meter, the combination with a casing providing a chamber having a cylindrical wall and a wall transversely of said cylindrical wall, a cylindrical oscillating piston within said chamber, a body Within said chamber providing a cylindrical surface concentric with the axis of said cylindrical. chamber, means carried by said piston and engaging said cylindrical surface of said body for confining said piston for circular movementof the axis thereof about and in parallel relation to the axis of said cylindrical chamber and with the circumference of the piston in contact with said cylindrical wall of the casing, said casing having in said wall thereof transverse to the axis of the cylindrical chamber a fluid inlet opening and a fluid outlet opening spaced circumferentially about the axis of said cylindrical chamber, and a partition extending from said cylindrical wall of said chamber toward'the axis thereof and abutting said body and said transverse wall between said inlet and said outlet openings and cooperating with said body and said walls to provide substantially fluid tight joints therewith, of a pivot member pivotally engaging said piston upon a pivotal axis fixed in relation to and adjacent the circumference of said piston an parallel to the axis of the cylinder thereof, guiding shoes rigidly connected to said pivot member at either side of the pivotal axis thereof and adapted for sliding engagement with th faces of said partition to provide for movement of said pivot member and of said piston along said partition'toward and away from the axis of said chamber upon movement of the axis of the cylinder of said piston about the axis of said cylindrical chamber, and a blade rigidly connected to said pivot member with the plane of the blade substantially in the plane of said partition and in edge-toedge relation thereto for movement of said blade with said pivot member and said guiding shoes along said partition, said blade coopcrating with said partition and said. casing to provide lealrage-resisting contacts therewith to prevent leakage of fluid by said partition from said inlet opening to said outlet opening.

3. In a fluid meter, the combination with a casing providing a chamber having a cylindrical wall and closing Walls transversely of said cylindrical wall, a cylindrical oscillating piston within said chamber, a body within said chamber providing a cylindrical surface concentricwith the .axis of said cylindrical chamber, means carried face of said body for confining said piston for circular movement of the axis thereof about and in parallel relation to the axis of said cylindrical chamber and with the circumference of the piston in contact with said cylindrical wall of the casing, said casing having in a wall thereof transverse to the axis of the cylindrical chamber a fluid inlet opening and a fluid outlet opening positioned adjacent said cylindrical wall of said casing and spaced circumferentially about the axis of said cylindrical chamber, and a partition extending from said cylindrical wall of said chamber toward the axis thereof and abutting said body and said transverse wall between said inlet and outlet openings of said wall and cooperating with said body and said cylindrical casing wall and said transverse wall to provide substantially fluid .tight joints therewith, said-cylindrical oscillating piston having a web transverse-to the side of said pivotal axis thereof extending in the direction from said web toward said transverse wall of said casing in which said inlet and said outlet openings are formed and adapted for sliding engagement with the faces of said partition to provide for movement of said pivot member andv of said, piston along said partition toward and away from the axis of said chamber concomitantly with oscillating movement of said piston relative to said pivot member upon movement of the axis of the cylinder of said piston about the axis of said cylindrical chamber, and a blade rigidly connected to said pivot member with the plane of the blade substantially in the plane of said partition in edge-to-edge sliding relation thereto and in'leakage-resisting contact therewith for movement thereof along said partition together with said pivot member and said piston,

said blade also engaging in sliding relation and in leakage-resisting contact both the transverse wall of said casing opposite to that in which said openings are formed and the cylindrical wall of said casing substantially to'prevent leakage of the fluid by said partition from said inlet opening to said outlet opening.

4. In a fluid meter the combination as defined in" claim 3 in which said cylindrical piston is formed with a peripheral wall providing a cylindrical exterior surface for contact with said cylindrical casing wall and an internal cylindrical surface for engaging the cylindrical surface of said body, said cylindrical pivot member being of greater diameter than the thickness of said peripheral wall of said piston and being truncated to provide a surface extending generally parallel to the axis thereof to prevent substantial interference with the contact of the cylindrical wall surfaces of the piston respectively with the cylindrical wall surfaces of the casing and of the cylindrical body within the chamber provided by the casing.

5. In a fluid meter the combination as defined in claim 2' in which said guiding shoes extend from said blade in face-to-face relation with said partition at either side thereof for a substantial part of the length of said blade, the outer faces of said guiding shoes being adapted to cooperate with the cylindrical casing wall to provide leakage resisting contact therewith.

6. In a fluid meter, the combination with a casing having a peripheral wall and having inlet and outlet openings for the fluid flowing therethrough, an oscillating piston within said casing adapted to revolve about an axis of revolution concomitantly with oscillation thereof, and means including a partition between said inlet and said outlet openings extending in the direction from said peripheral wall of said casing toward said axis of revolution and cooperating with said cas ing to prevent leakage of fluid past said partition from said inlet opening to said outlet opening, of a unitary member providing a blade adapted to move along said partition inwardly and outwardly with respect to said axis of revolution and to prevent leakage past said cylindrical portion and said partition in the movement;- of said unitary member and said blade along said partition, the parts of said cylindrical portion of said unitary member at either side of said slot being adapted slidably to engage the faces of said partition for guiding-said unitary member. along saidpartition, said oscillating piston being formed with aperipheral wallextending about, said axis ofrevolution of said piston and being provided with a cylindrical recess adjacent said peripheral, wall having the axis thereof parallel to said. axis of revolution of said piston, said recess being adaptedt'o receive said, cylindrical portion of said unitary member to provide for-pivotal movement of said piston with respect to said unitary member, where-by in the revolution of said piston about said axis of revolution within the casing. theaxis of said recess and the peripheral portion of said piston adjacent thereto are guided to move inwardly andoutwardly along said partition conconiitantly with oscillation of said piston upon saidaxis of said recess.

7.. In a fluid meter, the, combination as defined in claim 3 inwhich said cylindrical piston is formed with a peripheral wall providing a cylindrical exterior surface for contact with'said cylindrical casing wall and a concentric interior cylindrical surface for engaging the cylindrical surface of said body, said cylindrical pivot member providing a cylindrical bearing surf-ace in contact with cooperating cylindrical surfaces of said recess of substantial extentwhich are formed in said peripheral wall of said piston at opposite sides of the pivotal axis of said pivot member to provide for the pivotal movement of said piston withrespect to said pivot member, saidperipheral wall having a thickness relative to the diameter of said cylindrical pivotmember and the axis of saidpivotmember being located in said peripheral wall so as to preventcontact ofsaid cylindri'cai pivot member with said casing wall and with said cylindrical body surface in the movement of said piston and, said blade along said partition, said peripheral wall adjacent said' contacting bearing surfaces of said cylindrical pivot member and said recess being relieved to provide for said' pivotal movement of saidv peripheral wall relative to said blade.

HARRY E. KAMPF.

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

UNITED STATES PATENTS Number Name Date 380,628 Nash June 17, 1884 1,631,687 McLane Dec, 16, 1913 1,856,850 Mardcn May 3, 1932 2,455,628 Ulrich Dec. 7-, 19 .8 2,462,063 Berg-man Feb. 22, 1949

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