US2203801A - Closure device for sealed cooling systems - Google Patents

Description

A. L. SWANK June, 1940.

CLOSURE DEVICE FOR SEALED COOLING SYSTEMS- 2 Sheets-Sheet 1 Filed Nov. 12-, 1936 INVENTOR. BY flew/w? 1..5WANK 2 Sheets-Sheet 2 A. L. $WANK CLOSURE DEVICE FOR SEALED COOLING SYSTEMS Filed Nov. 12, 1936 June 11, 1940.

INVENTOR. flmwu/e L. SWANK M gm ATTORNEY5 Patented June 11, 1940 vention to increase the efficiency and cooling ca-.

UNITED STATES PATENT OFFICE] CLOSURE FOR SEALED COOLING l a SYSTEMS Arthur L. Swank, Detroit, Mich; Nellie L. Swank, special administratrix of said Arthur L. Swank, deceased; assignor to Eaton Manufacturing Company, Cleveland, Ohio, a corporation of Ohio Application November 12, 1936, Serial No. 110,507

20 Claims. -(oi. 220-44) 1 This invention relates to closures for tank openings, and more particularly to an improved closure device for the radiator of an internal combustion engine cooling system.

It is' well understood in the art to which this invention relates-that internal combustion en-,

gines are generally provided with a radiator through which a cooling fluid is circulated, and that such a radiator usually has a filling opening near the top thereof and a vent or overflow passage for maintaining the pressure within the cooling system substantially balanced with the atmospheric pressure outside of the system. It is alsovwell known that water at sea level atmospheric pressure boils at approximately 212 F. and that every pound of pressure applied to it above sea level air pressure its boiling point will be raised approximately 3 F. In engine cooling systems which are open to the atmosphere 212 F. is generally considered to be the'limit of the cooling range, but this limit is considerably reduccd if the engine is operated at an altitude above sea level, and is still further reduced when an anti-freeze such as alcohol is addedto the liquid of the cooling system. This reduction in the cooling range, the loss of cooling fluid through the vent and overflow passage, and certain other disadvantages are overcome in radiators on which my improved closure device is used.

It is therefore an object o! the present inpacity of an engine cooling system by providing a closure device adapted to maintain pressure in the system wh'ereby the boiling temperature of the cooling liquid may be raised substantially above the limit prevailing:

Another object of my invention is to provide a closure device for the filling and vent openings of the radiator of an engine cooling system Still another object of my invention is to provide an improved closure device for the radiator of an engine cooling systemin which loss of fluid through the vent oroverflow passage of the radiator is substantially eliminated by novel balile.

means embodied in the closure device.

A further object of, my invention is to provide an improved closure device, of the type mentioned, having a filler neck with a sealing surface internally thereof and a cap adapted to be.

4 sealing surface by a spring element of the cap.

Still another object of my invention is to provide an improved closure device comprising neck and cap members and in which the neck member is provided with an internal sealing surface and a gasket seat adjacent its outer end, and the cap member is provided with a pair of spring elements one of which is a disk for pressing a gasket against the gasket seat and the other of which acts to press a depending hollow part against said internal gasket seat.

Yet another object of my invention is to provide an improved closure device for a sealed cooling system in which neck and cap members have locking elements adapted to cooperatewith each other for releasably connecting such members and in which bodily removal of the cap member is temporarily prevented while pressure within the sealed system is being safely released.

Another object of my invention is to provide an improved closure device for a sealed cooling systern in which cap and neck members cooperate to provide inner and outer seals and are releasably connected by cooperating cam and finger external locking cams adjacent its outer end and an-inturned integral annular surface at its inner end.

It is a further object of my invention to provide a novel filler neck having a gasket seat at its outer end and an internal sealing surface spaced axially therefrom and also having depending arcuate portions which form cams outwardly of the gasket seat and which have stops thereon for temporarily limiting disengagement of looking fingers along the cams.

Other objects and-advantages of the invention will be apparent from the following description when taken in conjunction with the accompanying sheets of drawings, in which Fig. 1 is a bottom plan view, on an enlarged scale, of a closure device embodying my invention. i v

Fig. 2 isa vertical sectional view, on an enlarged scale, taken through the closure device of another closure device of my invention and show ing the same applied to the radiator of an engine cooling system.

Fig. 6 is a vertical sectional view taken through another cap of my invention which is adapted to be used on the filler. neck of a radiator where a bafliing of the overflow passage is desired.

Fig. 7 is a partial vertical sectional view taken through a similar type of closure but illustrating another form of spring element.

Fig. 8 is a vertical sectional view taken throug still another closure device of my invention and showing the same applied to the radiator of an engine cooling system.

Fig. 9 is a partial plan view thereof.

Fig 10 is a plan view of the filler neck, and

Fig. 11 is a side elevation of the filler neck.

In the accompanying drawings, to which more detailed reference will presently be made, I have shown improved closure devices adapted to be applied to the radiators of engine cooling systems for producing a desired sealing or bafiling effect. Although the drawings illustrate several different forms of devices for the accomplishment of these purposes it will be understood, of course,

, that these are by way of example and that the seat or sealing surface. .tubular memb er'is provided with an outwardly and downwardly turned flange l9 forming an aninvention may be embodied in still other devices and forms of construction.

In Figs. 1 and 2 of the drawings I show my invention embodied in a form of closure device which may be used where sealed cooling is desired, that is to say, on a system in which the cooling fluid is maintained under pressure. This device includes a tubular filler neck l and a cap or closure l6 adapted to be detachably connected to the neck. -'Ihe closure device is here shown as mounted on the upper part of the radiator ll of an engine cooling system with the passage of the neck in register with an opening of the radiator wa l.

The neck |5 may comprise a tubular metal member, preferably though not necessarily of cylindrical cross section,v which is provided at or adjacent its inner end with an integral inturned flange |8 forming an annular internal gasket The outer end. of the nular gasket seat 20 extending around the neck opening and a pair of depending arcuate elements 2| outwardly of the gasket seat. These depending arcuate elements are provided along the lower edge thereof with sloping cam faces 23 and are spaced apart to provide reces'ses 24 therelbetween which afford access to the cam faces.

jacent the ends of each cam the de-pendi p" element 2| y be provided with lugs or stops 25 and 26. The stop 25 provides a shoulder 21 adjacent the highest part of the cam which is engaged by the locking fingers or lugs of the cap member when the latter is fully connected with the neck member. The stop 26 which is located adjacent the start of the cam presentsa shoulder which is engaged by the fingers or lugs to temporarily prevent bodily removal of the cap from the neck a for the accomplishment of a safety function in releasing the pressure of the radiator, aswill be vent disengagement of the locking fingers of the cap from the cams ofv the neck, the fingers will nevertheless pass thereover if an increased rotative force is applied to the cap.

'At a point intermediate the outer gasket seat 2|] and the internal flange l8, the wall of the neck is provided with a vent or overflow opening 30 which communicates with the neck passage. At this-poi-ntthe wallof the neck may be drawn or formed to providea short tubular projection 3| with which a vent and drain pipe 32 may be connected.

An annular sealing gasket or washer 33, formed of fiber or other suitable material, may be disposed in the neck in engagement with the flange l8 thereof. The gasket may be retained in place adjacent this flange by circumferentially spaced lugs 34 formed by partially shearing and displacing metal of the neckwall'radially iriward.

The cap |6, which is adapted to be applied 'to' locking lugs or fingers 39 which are of a size and shape to pass freely through the recesses 24 cf the neck and to cooperate with the cam surfaces 23 for releasably connecting the cap and neck members. In this instance I show the skirt as being provided with two locking fingers 39 to correspond in number with the recesses 24 oftthe filler neck. The cap may include a hollow bafiie member or valve housing 4| which extends in depending relation from the outer member 36 substantially centrally thereof and is adapted to enter the passage of the filler neck when the cap is applied thereto. The member 4| may be a sheet metal stamping of dome-like or inverted-cup form and,

. at its lower end, may be provided with a transouter member 36 by means of a spring element.

preferably in the form of a disk or diaphragm 44, which is retained in the annularskirt 38.

The top portion of the dome-like member-4| engages the center section of the disk 44 and may be connected with this disk by means of a rivet 45 which permits rotation of the member relative to the disk. The member 4| is thus centered with respect to the axis of the cap and when the cap is applied to the neck there-is an intervening space 45 between this member and the wall of the neck with which space the overflow opening 30 communicates Between the spring disk 44 and the top wall 31 of the outer member 36 I may provide a second spring element 48 which is also preferably in the form of a disk. The resilient disk 48 is engaged substantially centrally thereof by the center section of the disk 44 and by the head of the rivet 45, but outwardly of this engagement it is spaced from the disk 44. The disks. and 48 may be corrugated, as shown in Fig. 2, and both are preferably bowed or dished away from the top wall 31 so aaoasoi in the annulanskirt 38 of the outer cap member and is adapted to be sealingly pressed by the resilient disk 44 against the gasket seat 26 of the neck when the cap is applied thereto. The resilient disk 48 is preferably somewhat stifier than the resilient disk 44 so that when the cap is applied to the filler neck and is drawn down by the action of the sloping cams 23, the disk 44-will deflect ahead of the disk 48. The initial rotation of the cap causes the disk 44 to yieldingly press the gasket 50. into sealing engagement with the v gasket seat 20, and further rotation of the cap causes the annular head 43 of the valve housing to engage the gasket 33 and upon deflection of the resilient disk 48 the bead is sealingly pressed against the gasket.

It will be noted that .the bottom plate '42 of the valve housing 4| is provided with a central opening 52 which communicates with the neck passage, and that the dome-shaped member of the valve housing is provided with one or more openings 53 connecting the interior of the valve housing with the intervening space 46. when the cap has been applied to the filler neck so that the inner and outer seals have been formed re-' sure in the radiator acting thereagainst.

spectively at the gaskets 33 and 56, it will be seen that fluid can flow into or out of the radiator, I] through the passage 30 only by traveling through the openings 52 and 53 of the valve housing.

on the plate 42 as a raised ridge extending around I the opening 58. The valve 56 is adapted to be opened by atmospheric pressure acting thereagainst through the opening 58 when a subatmospheric pressure exists in the radiator II.

The main valve 55 may be hacked or carried by a plate member 60 which is axially movable in and guided by the dome-like member 4|. If

desired, the plate member 66 may be provided with an annular rib 6] which engages the valve 55 substantially in line with the valve seat 51. The plate member 60 may also be provided with a depending extension 62 which engages in an opening of the valve 55 and centers the latter with respect to the axis of the cap;

For yieldingly pressing the main valve 55 against its seat 51 I provide a coiled compression spring 63 having one end thereof seating against a portion of the top wall of the dom'e-like member 4|, and its other end in engagement with a spring plate 64. This spring plate is positioned and guided by lugs 66 struck up from the valve plate 66 and may be provided substantially centrally thereof with a localized eo'nvex projection 66 which forms a. rocking connection between these two plates. The spring 63 pressesthe valve against its seat 51 but yields to permit a how of vapor or liquid from the radiator into the valve housing when the pressure in'the radiator exceeds a predetermined value, forexample tour pounds per square inch.

from pressing the valve 56 against its seat.

The auxiliary or vacuum-relief valve 56 may be supported adjacent the opening 58 and yieldingly pressed against the valve seat 59 by a spring 68. This spring may be in the form of an arm which is connected to the plate 42 by means of a rivet 69-, and which has an intermediate ring portion 1-8 surrounding the .openlng 52. The

valve 56 may be retained in aligned relation with the seat 58 by means of a rivet II having its stem extending through the valve and into the opening 58. The valve is of a size such that when its lateral shifting is limited by the rivet H engaging the edge of the opening 58 at any pointit. will always overlap the valve seat 59.. The valve 56 need not be directly connected with the spring arm 68 but, as shown in the drawings, may only be held against the valve seat 59 so that the stem of the rivet ll cannot'be withdrawn from the opening 58. If desired the arm 68 may be provided with a recess 12 in which the head of the rivet H engages to provide a rocking connection substantially centrally of the valve. At the point of connection of the arm 68 with the plate 42 the latter may be provided with a raised portion or shoulder 13 which holds the arm spaced from the plate so that dirt entering ,therebetween will not prevent the arm This valve is relativel' light in weight and the arm 68 need only be still enough to hold the valve against its seat when-the pressures on opposite sides of the valve are equalized,

If desired, a guard may be provided for the valve 56 and its actuating arm 68, in the'form of a disk 14 which overlies the valve and arm and is spaced from the bottom plate 42 of the valve housing. This guard may be supported plate 42 with an extension flange 15 around the opening 52 which is engaged by a central annular flange 16 of the guard.

In assembling the parts of the cap the resilient disk 44, and the resilient disk 48 carrying the valve housing 4|, are dropped into the annular skirt 38 and thereafter portions of the skirt are pressed inwardly at a plurality of points to form retaining lugs 18, as shown in Fig. 4. These lugs prevent the disks 44 and 48 from dropping out of the member 36 and when the cap is detached from the filler neck the disk 44 springs away from the disk 48 and engages these lugs. While the cap is detached from the neck the-engagement of the disk 48 against the top wall of the member 36 and the engagement of the disk 44 against the lugs I6 holds the various parts against rattling whilethe cap is being handled. If desired the depending skirt 38 of the outer memberv 36 may also be provided at diametrically opposed points with lateral projections 19 which afford a good hand grip on the cap for rotating the same on the flller neck. v From the description of my improved closure device as it has thus far progressed, it will be seen that when the device is connected to the radiator tank IT, as by brazing or welding of the internal annular 'neckflange thereto, a desired pressure condition can be maintained in the radiator and loss of cooling fluid and anti-freeze solution through the vent and overflow connection 32 will be substantially eliminated. By maintaining a pressure in the radiator the boiling temperature of the cooling fluid is raised and the cooling range and capacity of the radiator are considerably increased. Since the sealing of the radiator to maintain a pressure therein prefrom the valve housing by providing the bottom vents the escape of the cooling fluid in the form of liquid or vapor, it will be seen that the supply of cooling fluid will not become diminished dur ing operation of the engine and will require only occasional attention or replenishment.

The maintaining of the initial supplyof cooling fluid is an important advantage because it eliminates the undesirable effects of scale and sediment accumulations which frequently result from the replenishment of the supply of cooling fluid by impure water. The maintaining of a pressure in the radiator also results in another important advantage in that the thermostatic valve, which is now common in the cooling systems of internal combustion engines, can be set at a value considerably higher than the "usual 140 setting heretofore used without loss of alcohol or other anti-freeze which may be mixed with the cooling fluid and. for increasing the efiectiveness and capacity of car heaters operated from the cooling system.

The provision of means for temporarily preventing bodily removal of the cap from the neck during relative disconnecting movement constitutes a very important part of my invention because it furnishes a safety feature for the protection of persons operating or servicing vehicles having sealed cooling systems. This safety feature may be in the form of stops 26 located adjacent the starting ends of theiieams 23, and as I have already stated, these stops are engaged by the fingers 39 of'the cap when the latter is rotatedina direction to disengage the same from the neck. The engagement of the fingers with these stops temporarily prevents release of the fingers through the recesses 24 and prevents bodily removal of the cap from the filler neck until the fingers have been forcibly moved over thestops. When the cap has been rotated sufficiently from its fully applied position to bring the fingers 39 into engagement with the stops 26, the inner seal will be broken by the release of sealing pressure of the bead 43 against the gasket 33. The release of this inner seal allows vapor pressure in the radiator to pass into the intervening space 46 and tobe relieved through the dischargeopening 30. It will be understood, however, that when the inner seal is released by rotary movement of the fingers I 39 into engagement with the stops 26, the gasket 50 is still pressed against the gasket seat 20 by the resilient disk 44 so as to maintain the outer seal.

Under ordinary conditions of operation, the release of theinner seal results in the vapor pressure of the radiator l'l being released through the discharge opening 30 before the fingers 39 are forced over the stops 23 and the outer seal broken by bodily removal of the cap from the filler neck. If, however, there is a substantial pressure in the radiator H the release of the inner seal by rotation of the fingers 39 into engagement with the stops 2! allows the vapor pressure to enter the intervening space 46 and, acting against the relatively large area of the resilient disk .44, causes the seal between the gasket 50 and the seat 20 to be broken. This results in a flow of heated vapor and cooling fluid out between the filler neck and the skirt flange 38 of the cap and at once causes the outer member 36 to become very hot, such that the operator who is opening the closure device will quickly remove his hand from the cap. This heating of the cap warns the operator that a pressure condition exists in the radiator and that the fingers 39 should. not be forced over lugs 26 as is necessary for bodily removal of the the passage of the neck is not obstructed as it would be if the locking elements were located interiorly thereof. It will also be noted that in addition to forming a gasket seat for an inner seal the internal annular flange adjacent the innerend of the neck provides a means for readily connecting the neck with the top wall of the radiator I'l With this novel form of construction the filler neck can be of relatively small diameter and can be closed either by a cap of the type which will seal the radiator opening and overflow passage and afford sealed cooling, or by the conventional and less expensive type of cap which has been in general use heretofore and which seals only the outer end of the filler neck.

In Fig. 5 of the drawings I have shown another closure device for the radiatorof an eng'ine cooling system. This closure device is generally similar in construction to the device of Figs. 1 and 2 and functions in the same man.- ner to produce .a sealed cooling system. The only important difference between [the closure device of Fig. 5 and that of Fig. 2 is in the location and mounting of thevacuum-relief valve. In the closure device of Fig. 5 the vacuum-relief valve 8| is located on the main valve 82 and controls an opening 83 formed through the latter centrally thereof. The main valve 82 is normally urged towards its seat 84 by a coiled compression spring 85 and the auxiliary or vacuumrelief valve 8| is normally urged toward seating engagement with the lower face of the main valve by--means of atension spring 86. One end 8| and its other end is connected with a bridge member 81 which is carried by the main valve and disposed within the coiled spring 85.

For certain reasons it may be desirable to use a cap on the filler neck l5 of the radiator of such form that it'does not completely seal, but only baflles, the overflow passage. The use of a cap of this form may be found desirable for various reasons, for example, its simpler and less expensive construction or the reduced need for sealed-cooling operation of vehicles in portions of the country which are at a comparatively low altitude above sea level and where the boiling point of water is not materially less than 212 -F.

In Fig. 6 of the drawingsI show a cap of this type which can be applied to. the same filler neck as would be used for sealed cooling, and which will effectively seal the outer end of the neck and, at the same time, provide an effective baflle for the vent and overflow passage of the radiator. As shown in Fig. 6, this cap comprises a cup-like sheet metal shell or outer member having a transverse top wall and a depending annular marginal skirt 9|. The skirt is provided at two or more points around its lower edge with inturned locking lugs or fingers r92 adapted to cooperate with the external cams of the filler neck for releasably connecting thecap thereto. The cap is also provided with a-resillent disk 93 which is retained in the skirt of u if desired, also by additional lugs formed thereon similar to the lugs 19 of Fig. 4. The resilient 1 disk- 93 may be corrugated and is preferably bowed or dished away from the top wall of the outer member so that only its outer marginal edge engages the top wall of the cap adjacent the depending skirt 9| thereof. An annular sealing gasket 94 formed of suitable material is also retained in the marginal skirt 9| of the outer member and is adapted to be pressed against the outer end of the filler neck by the resilient disk 93 when the cap is applied to the neck and locked thereon. I

For baflling the vent and overflow passage 39 of the filler neck I5 I provide the cap with a hollow dome-like member 95 which extends in depending relation substantially centrally thereof and is carried by the resilient disk 93. The domelike hollow member 95 may .be. similar to or identical with the dome-like member H which forms the valve housing of the cap illustrated in Fig. 2, and may be disposed with the flat portion 99 of the top thereof in engagement with the central plate section 91 of the resilient disk 93. The member 95 may be connected with the. resilient. disk, as by means of the rivet 99. This rivet also serves to hold in place a cup-like bearing member 99 which is disposed between .the central plate section 91 of the resilient disk and the top wall of the outer member 99. The rivet preferably does not grip the members through which it extends; but permits the outer cap member and the disk-93 to rotate relative to the hollow baflle member 95. The lower end of the domeshaped baflle member 95 is preferably provided with a transverse plate I99 which is connected therewith by an annular bead II" and which has a central opening I92.

when the cap is applied to the filler neck I5 of the radiator I1 the gasket 94 seals the outer end of the neck and. the annular bead I9I sealingly engages the gasket 33 adjacent the inner end of the neck. The central opening I92 of the plate I99 connects the radiator with the hollow interior or chamber of the baffle member 95 and one or more openings I93 formed in the latter member connect the chamber thereof with the passage of the filler neck above the gasket 33. Thus if a pressure condition is 'created in the radiator I1 by the generation of vapor or by the expansion of the cooling liquid, vapor or liquid can pass through the opening I92 into the baffle chamber and then through the opening I93 to the discharge or overflow opening of the neck. Because of the baflled and circuitous passage thus provided it will be seen that fluid will not be readily splashed out of the radiator and lost through the overflow passage.

Instead of providing the bearing member 99 in the form of a separate part, it may be desirable to construct this hearing member as an integral part-I95 of the resilient disk 93, as illustrated in Fig. 7. I

In Figs. 8 to 11 inclusive I have shown another closure device adapted to be used on the radiator of a vehicle cooling system to produce a sealed- I .cooling effect. This closure device is generally bodily removal of the cap from the filler neckuntil after'the inner seal has been" released.

. A3 shown in Figs. 8, 10 and 11 the filler neck I93 of this closure device may have an internal annular flange I99 adjacent its inner end forming a seat for a sealing gasket H9 and providing an available means for connection with the tank of the radiator IH.- At its outer end the neck is provided with an outturned flange H2 which carries a pair of depending arcuate flange-like members H3. These depending members I I3 are provided at their lower edge with a camsurface H4 and are spaced apart to provide recesses or openings H5 in the flange H2 affording access to the cam surfaces.- The depending arcuate members H3 may also be provided with lugs H6 -whichform stops adjacent'the high ends of thecam surfaces.

The closure .cap itself may comprise outer and inner members H8 and H9 which are connected together and provide a valve chamber I29 therebetween. The outervmember is provided with a depending annular marginal skirt I2I which carries inturned locking lugs or flngers I22 for engagement with the cam surfaces H4 of the filler neck. The innermember H9 may be of substantially cup-like form and may be held with its open end against. the cap member H8 by means of screws I23 extending through an external flange or lip I24 of the cup.- Adjacent its upper end the cup-like inner member H9 has a wall portion I25 of a size and shape to snugly engage in and fill the passage of the neck I98 so as to provide a seal adjacent'the outer end of the neck when the cap is applied thereto. Inwardly of the sealing portion I25 thecup-hke member H9 is of reduced cross section so as to provide an intervening space I26 between the engage and press against the sealing gasket H9 to provide the inner seal. The'cap may be provided with a. pair of bowed acurately extending springs I3I which are retained in place by the screws I23 and which engage the flange I I2 at the outer end of the filler neck when the cap is and I33. The main valve I32 is contained in the chamber I29 of the cap and under the action of a coiled compression spring I34 normally closes the opening I35 of the transverse bottom wall I39. This coiled spring may be centered with respect to the axis of the opening I35 by engagement with a depending boss I34a of the outer member H8. The vacuum-relief valve I33 controls an opening I36 of the main valve and is normally held in position to close this opening by means of a tension spring I31.

As mentioned above, this closure device. also embodies a safety feature which temporarily prevents bodily removal of the cap from the neck opening until after the inner seal has been released. This feature consists in providing means for temporarily limiting the unlocking rotary movement of the cap and which may be in the form of a shoulder I98 and a notch I39a formed on each of the arcuate members I I3 of the filler neck. When the cap is being removed from the filler neck the rotary movement applied thereto moves the locking fingers I 22 away from the stops 1 l6 and into the notch |38a to engage the shoulder I38 whereupon the rotary movement is temporarily arrested. When the locking fingers I22 have engaged the shoulders I38 the inner seal at the gasket H0 will have been released and pressure in the radiator III will be relieved through the vent and overflow opening I28. While this is taking place the outer seal formed by the wall portion I25 will be maintained and will notbe broken until the operator disengages the fingers I22 from the shoulders I38 and rotates the cap further in a direction to disengage the fingers from the cam surfaces Ill.

I have already'mentioned certain important advantages which are obtained in a cooling system which is sealed or baliled by my improved closure device but, in addition, it will be understood that further advantages are attained in some cooling systems by the elimination of air being drawn into the cooling system on the suction side of the water pump and the presence of which tends to reduce the boiling temperature of the cooling fluid. It will also be seen that by maintaining a pressure in the radiator the sea level boiling temperature'may be raised, for example, to 227 F. where five pounds pressure is used, thus providing an additional cooling margin which greatly increases the efficiency and capacity of the cooling system even in hot summer weather.

While I have illustrated and described the closure devices of my invention in a somewhat de'- tailed manner it will be understood, of course, that I do not wish to be limited to the precise details of construction and arrangements of parts illustrated and described, but regard my invention as including such changes and modifications as do not involve a departure from the spirit of the invention and the scope of the appended claims.

'Having thus described my invention I claim:

-1. In a filler neck and closure combination for engine cooling systems, a receptacle, a neck having at one end an integral inturned flange and at its other end an outwardly and downwardly formed flange providing a sealing surface and cam portions adjacent thereto, a vent opening through a wall of said neck, a closure for said neck having a depending skirt with fingers adapt-' 2. In a closure device the combination of av tubular neck having locking elements adjacent its outer end and' an internal annular sealing surface spaced from said end, a cap having locking elements adapted for releasable engagement with the locking elements of the neck, a resilient disk retained in said cap, and a member carried by Sam disk and adapted to be yieldmgly messed tubular neck having axially spaced outer and inthereby against said sealing surface, said member having a pivotal connection with the disk substantially centrally thereof to permit rota- -tion of the cap and. disk relative to said member while the latter engages said sealing surface.

3. In a closure device the combination. of a filler .neck having locking means adjacent its outer end and an internal annular sealing surface axially inward fromsaid outer end, means providing a discharge connection leading from thejneck between said outer end and said internal sealing surface, a cap adapted to be applied to said neck and having locking means adapted to cooperate with the locking means of the neck,

a hollow member adapted to extend into the hollow member and operable to press the latter against said internal sealing surface.

4. In a closure device the combination of a filler neck having locking means adjacent its outer end and an internal annular sealing surface axially inward from said outer end, means providing a discharge connection leading from the neck between said outer end and said internal sealing surface, a cap adapted to be ap plied to said neck and having locking means adapted to cooperate with the locking means of the neck for releasably connecting the same upon relative movement therebetween, a hollow member adapted to extend into the neck and engage said sealing surface with a space between such memberand the wallof the neck, said member having an opening connecting the interior thereof with said space, a spring disk providing a connection between said hollow member and they cap and operable to press the hollow member against said sealing surface, and means effective during disengaging movement to temporarily prevent bodiLy-removal of the cap from the neck after disengagement of said hollow member from said sealing surface.

5. In an engine cooling system a receptacle, a filler neck for said receptacle having a sealing surface and cam sections adjacent its outer end and a second sealing surface adjacent its inner end, a vent passage, and a closure for said neck including pressure control valves and a part engageable with said second sealing surface, each cam section having two lift portions one to attach the closure to the neck and a second to effect a seal at said second sealing surface.

6. In an engine cooling system a receptacle, a filler neck for said receptacle provided with an inturned-bottom flange, a closure for said neck, a valve housing depending from said closure in the form of an open sheet metal cup, and a plate having an annular bead connecting the same to the openend of said valve housing, said plate adapted to cooperate in sealing relation with said neck flange and provided with a valve seating surface.

7. In a closure for cooling systems, a filler neck provided with an inturned bottom flange and an outwardly turned top flange, a cap adapted to be applied to the-neck, a valve housing depending from said cap, and two spring elements between said cap and valve housing, one to effect -a seal on the top neck flange and the second to effect a seal on the bottom neck flange.

8. In a closure device the combination of a pressed respectively against said outer and inner sealing surfaces when the cap is applied to the neck, said hollow part having an opening in r the lower portion thereof, and a spring-pressed relief-valve in said hollow part normally closing.

- said opening.

9. In a closure device the combination of a tubular neck having axially spaced outer and inner annular sealing surfaces, a cap adapted to be releasably connected with the neck and having a disk part and a hollow part adapted to be pressed respectively against said, outer and inner sealing surfaces when the cap-is applied to the neck, said hollow part having an opening in the lower portion thereof, a spring-pressed reliefvalve in said hollow part normally closing said opening, and means providing a second springpressed relief-valve adapted to open in the opposite direction. 1

10. In a closure device, a filler neck comprising a tubular member having an out-turned flange providing an annular sealing surface and having arcuate portions depending outwardly of said sealing surface, said depending arcuate portions having cam elements thereon and being spaced apart to provide recesses affording access to the cam elements, said arcuate portions also having stops thereon adjacent one end of the cam elements and surmountable stops adjacent the other end of the cam elements.

11. In a closure device the combination of a tubular neck having axially spaced outer and inner annular sealing surfaces, a cap adapted to be releasably connected with the neck and having a disk part and a hollow part adapted to be pressed respectively against said outer and inner sealing surfaces when the cap is applied to the neck, said hollow part being mounted for swiveling movement relative to the cap and having an opening in the lower portion thereof, and a spring-pressed relief-valve in said hollow part normally closing said opening.

12. In a closed pressure system, a vented filler spout, a pressure operated valve closing the spout on one side 01' the vent, a removable cap closing the spout on the other side of the vent, means joining the valve to the cap for removal as a unit. therewith and a detachable connection between the spout and cap comprising camming abutments on the spout and cap, respectively. engageable upon relative rotation of the cap and a safety stop on one of said abutments for engagement with the other abutment to position the parts with the spout closed by the cap and opened by the valve.

13 In a device of the character described, a spout cap, a cage seating a pressure operated valve and being adapted for seating engagement 'most seat when the cap is rotated beyond said stop, a pressure relief valve within said cage and a pressure sealing member carried by the cap and engaging the outermost seal in all relative interengaged positions 01' the cap and spout.

15. In a pressure system, a filler spout, a removable cap therefor, interengaging camming abutments on the spout and cap, respectively, to draw the cap downwardly upon relative rotation, a stop associated with the camming abutments near the outer limit of reverse relative rotation, an overflow pipe leading from the spout below the cap, an overflow closure device carried by the cap for seating on the spout below the overflow pipe when the cap is drawn down and unseating when n the cap is reversely rotated to a position wherein the stop resists cap removal.

16. In a closed cooling system for engines, a filler spout having an overflow pipe associated therewith, a spout closure cap, a bayonet type connection between the cap and spout including a camming member having a pair of spaced seats and a locking member engageable with either seat to retain the cap on the spout, and an overflow pipe valve adapted to be closed when said locking member is in engagement with one of said seats and to be opened when the locking member engages the other seat.

17. Radiator filler and closure structure, including a vented filler spout having an internal seat, a removable closure cap rotatable on the spout to and from closed position, a valve cage adapted to engage said internal seat to seal the spout, a pressure actuated valve operatively housed within saidcage and swivel means connecting the cage and cap for relative movement during cap rotation.

, 18. In a pressure cooling system, a valve cage assembly comprising a cupped casing, a valve seating spring enclosed within the casing in bearing engagement with the base of the casing, an outwardly opening valve acting against said spring, an inwardly opening valve seated over an opening in the first mentioned valve, a spring seating the inwardly opening valve, and a closure plate for the open end of the casing to retain the valves and springs therein and to seat the first mentioned valve and the last mentioned spring.

19. In a device of the character described, a filler spout having a vent and spaced'seats on opposite sides of the vent, a closure assembly including a valve seating cage to engage one of said seats, a flexible diaphragm for peripheral engagement with the other seat, means detachably securing the assembly on the spout and having spaced stations for selective engagement, at one of which the cage is seated and at the other of which the cage is unseated without complete detachmentof said means from the spout and means out of engagement with the diaphragm at the first mentioned station but abutting the diaphragm to unseat the same at the next mentioned station.

20. In a closure device for an engine cooling system, a cap member, a hollow valve cage de pending from said cap member and provided with a seat, and a spring seated valve structure housed in said cage and movable relative thereto for the relief of pressure, said valve structure comprising a sealing portion engageable with said seat and portions extending laterally beyond the sealing portion for guiding engagement with the cage.

ARTHUR L. SWANK.

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