EP0760789A1

EP0760789A1 - Closure cap which can be fixed onto a container neck

Info

Publication number: EP0760789A1
Application number: EP95923217A
Authority: EP
Inventors: Heinrich Reutter
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-06-01
Filing date: 1995-05-31
Publication date: 1997-03-12
Anticipated expiration: 2015-05-31
Also published as: ES2121626T3; CA2191607A1; EP0760789B1; WO1995032904A1; US6378717B1; ATE170151T1; BR9507812A

Abstract

A closure cap which can screw onto the fixed neck of a cooling system expansion tank. The closure cap is provided with a screw cap and a threaded section in which a combination pressure-vacuum valve is mounted concentrically and in such a way that it can rotate in relation to the screw cap. The valve is provided with a sealing element which comes into tight contact with the fixed neck when the closure is screwed. To endure that the closure cap can be unscrewed only when the excess heat in the cooling system has been completely dissipated, it is proposed that the closure cap when screwed onto the fixed neck would be prevented from unscrewing means of a temperature-dependent control element.

Description

Title: Closing lid that can be attached to a container neck

description

The present invention relates to a preferably screwable or pluggable and rotatable closure cap to be fastened to a stationary connection piece, for example a motor vehicle radiator, a compensating container for cooling or heating systems or the like, according to the preamble of claim 1.

Such caps are used, for example, in motor vehicle cooling systems, either directly as a radiator cap or as a closure of the expansion tank. The closure cover can either be screwed on by means of a thread or can be attached and rotated by means of a bayonet element. In the case of motor vehicle cooling systems, there is a problem with regard to the closure caps in that the pressure is also generally high due to the high temperature in the cooling system. Even if the temperature in the cooling system is not too high when the engine is switched off after switching off the engine, a certain post-heating effect can result in a temperature and thus an increase in pressure in the cooling system. If the cap on the cooling system is immediately removed, there is an acute risk of scalding for the user concerned. This danger exists in particular in the case of screw-on sealing caps, since the user is not encouraged to unscrew or unscrew the unscrewing in the last phase when unscrewing the sealing cap, in order to balance the pressure with the outside air and, above all, to wait. When a closure cap is screwed onto the cooling system, a vent connection is opened to the outside, but this cannot be done as quickly as the user can possibly unscrew the closure cap completely. The same applies to the use of a cover provided with a bayonet lock.

It is therefore an object of the present invention to provide a closure cover of the type mentioned at the outset which cannot be removed when the cooling systems are still under temperature, but only when the excess temperature has been completely eliminated and which is nevertheless constructed to save space.

To achieve this object, the features specified in claim 1 are provided in a closure lid of the type mentioned.

The measures according to the invention create a sealing cover which cannot be removed when there is still a critical high temperature in the cooling system (or in the heating system). This in any case prevents injuries due to high temperature and the resulting overpressure in the stationary connection piece when the closure cover is opened may occur. The temperature-dependent control element is accommodated in a space-saving manner with the coupling element.

According to one embodiment, it is possible to provide the temperature-dependent element between the cap and valve or cap and socket, so that the cap is then locked against rotation with respect to the stationary socket.

A preferred embodiment of the present invention is, however, implemented according to the features of claim 3. It is thereby achieved that the cap turns empty in relation to the engagement part in the event of overtemperature, so that even with force it is not possible to detach the closure cover from the stationary connection piece.

Preferred embodiment variants result from the features of one or more of the further claims.

Further details of the invention can be found in the following description, in which the invention is described and explained in more detail with reference to the exemplary embodiments illustrated in the drawing. Show it:

Figure 1A left and right of

Longitudinal section of the center line in different planes through a closure cap screwed onto a stationary connection piece of a container with a temperature-dependent

Unscrew protection according to a first embodiment of the present invention, Figure 1B in partially broken

1 shows a plan view of a temperature-dependent control element used for the screw-off protection in the closure cover according to FIG. 1A,

2A and 2B corresponding to Figs. 1A and 1B

Representations of the closure cover and associated temperature-dependent control element, but according to a second exemplary embodiment of the present invention,

3A and 3B corresponding to Figs. 1A and 1B

Representations of the closure cover and associated temperature-dependent control element, but according to a third embodiment of the present invention

4 and 5 each show a representation corresponding to FIG. 1A, but according to a fourth and fifth exemplary embodiment of the present invention,

6 and 7 each show a representation corresponding to FIG. 1A, but according to a sixth and seventh exemplary embodiment of the present invention,

8 and 9 each show a representation corresponding to FIG. 1A, but according to an eighth and ninth Embodiment of the present invention, and

10 and 11 each show a representation corresponding to FIG. 1A, but according to a tenth and eleventh embodiment of the present invention.

The closure cover 10, 10 ', 10 ", 110, 110', 210, 210 ', 310, 310', 410 and 410 'shown in the drawing according to eleven exemplary embodiments, which on the fixed connection piece 11 of an expansion tank (not shown) Motor vehicle cooler system is screwed on, has a screw cap 14, 14 ', 14 ", 114, 114', 214, 214 ', 314, 314', 414, 414 'an external thread part 21, 21', 21", 121, 121 ' , 221, 221 ', 321, 321', 421, 421 'and a valve 15, 15', 15 ", 115, 115 ', 215, 215', 315, 315 ', 415, 415'. In these exemplary embodiments, the connector 11 of the expansion tank has two concentric parts, namely on the outside an internal thread part 13, which is not indicated in FIGS. 2A and 3A, and which has the

External thread part 21, 21 ', 21 ", 121, 121', 221, 221 ', 321, 321', 421, 421 'of the closure cover 10, 10', 10", 110, 110 ', 210, 210', 310, 310 ', 410 and 410', and an internal neck 16 into which the valve 15, 15 ', 15 ", 115, 115', 215, 215 ', 315, 315', 415, 415 'of the closure cover 10, 10 ', 10 ", 110, 110', 210, 210 ', 310, 310', 410 and 410 '. It goes without saying that it is also possible to provide the closure cover 10, 10 ', 10 ", 110, 110', 210, 210 ', 310, 310', 410 or 410 'with an internal thread and / or to form it in this way that it can be screwed directly onto the stationary connection piece of a motor vehicle radiator. Essential on the closure cover 10, 10 'according to the invention, 10 ", 110, 110 ', 210, 210', 310, 310 ', 410 or 410' is that it is equipped with a temperature-dependent unscrew protection 20, 20 ', 20", 120, 120', 220, 220 ', 320 , 320 ', 420 and 420' is provided, which ensures that the closure cover 10, 10 ', 10 ", 110, 110', 210, 210 ', 310, 310', 410 and 410 'from the respective fixed nozzle 11 can only be detached or unscrewed when the expansion tank or the motor vehicle radiator or the like has dropped to normal or ambient temperature.

In all exemplary embodiments, the screw cap 14, 14 ', 14 ", 114, 114', 214, 214 ', 314, 314', 414, 414 'of the closure cover 10, 10', 10", 110, 110 ', 210, 210 ', 310, 310', 410 and 410 'are provided with a cover plate 22 over which, for example, a grip strip 23 extends diagonally. The screw cap 14, 14 ', 14 ", 114, 114', 214, 214 ', 314, 314', 414, 414 'is hollow, and in the region of the grip strip 23 the cylindrical cavity 24, which is cylindrical per se, is extended by rectangular depressions 25 .

In the exemplary embodiments according to FIGS. 1 to 9, the screw cap 14, 14 ', 14 ", 114, 114', 214, 214 ', 314, 314', 414, 414 'and the external thread part or connector 21, 21' , 21 ", 121, 121 ', 221, 221', 321, 321 ', 421, 421' of the closure cover 10, 10 ', 10", 110, 110', 210, 210 ', 310, 310', 410 resp 410 'separate components and connected to one another in such a way that they are axially immovable relative to one another, but can be moved in the circumferential direction, and are each combined to form a one-piece component in the exemplary embodiments according to Figures 10 and 11. In the former case, the external threaded connector is provided with a provided on the inside projecting annular collar 31 which engages in a retaining ring 32 which is L-shaped in cross section and interrupted in the area of the depressions 25 and which is integrally formed on the underside of the cover plate 22. This makes the Male thread connector held on the underside of the screw cap.

Inside the screw cap 14, 14 ', 14 ", 114, 114', 214, 214 ', 314, 314', 414, 414 'or the external threaded connector 21, 21', 21", 121, 121 ', 221, 221 ', 321, 321', 421, 421 'and concentric to the latter is a valve housing 17 of the valve on the screw cap 14, 14', 14 ", 114, 114 ', 214, 214', 314, 314 ', 414, 414 The relative rotatability between the valve housing 17 and the screw cap 14, 14 ', 14 ", 114, 114', 214, 214 ', 314, 314', 414, 414 'is rotatable relative to the latter and held substantially immovable in the axial direction achieved in a similar way as the relative rotatability between the screw cap and the external threaded connector. The valve is designed in a manner which is not to be described in detail because it is known per se as a combined overpressure / vacuum valve which, when the closure cover 10, 10 ', 10 ", 110, 110', 210, 210 'is screwed onto the fixed socket 11, , 310, 310 ', 410 or 410' opens when excessive pressure or negative pressure occurs and thus protects the cooling system. The valve housing 17 is provided on a front part 28 with an annular groove 26 into which an O-ring 27 is inserted which, when the cap 10, 10 ', 10 ", 110, 110', 210, 210 ', 310, 310', 410 or 410 'is completely screwed on, lies sealingly against the smooth inner surface 18 of the neck 16 of the compensating container.

In the first exemplary embodiment in FIGS. 1A and IB, a compression spring 36 is provided in the center of the cavity 24 of the screw cap 14 and is supported at one end on the raised part of the cover plate 22 in the region of the handle strip 23. The other end of the compression spring 36 faces a temperature-dependent control element in the form of an elongated, narrow bimetal plate or strip 37 and an elongated control plate 38 movable in the axial direction of the closure cover 10 against the action of the compression spring 36. The bimetallic strip 37 and the control plate 38 extend over a substantial part of the length of the grip strip 23. The control plate 38 is flat at its central region 39 formed and provided at its other outer end regions 41 (only one of which is visible in FIG. 1A) with an offset 42, the free end 43 of which can engage in the collar 31 for the rotationally fixed connection. The bimetallic strip 37 is arranged on the upper side of the control plate 38 facing the compression spring 36. The central region 44 of the bimetallic plate 37 lies between the other end of the compression spring 36 and the central region 39 of the control plate 38. In this central region, the bimetallic strip 37 can be firmly connected to the control plate 38 or can only rest loosely on it. As can be seen from FIG. 1B, the central region 44 of the bimetallic strip 37, which, like the control plate 38, extends across the grip strip 23 or the two depressions 25, is provided with a rectangular recess 46 for the rotationally fixed connection to the screw cap 14 . The same applies to the control plate 38 in a manner not shown. The bimetal strip 37 is shaped in the state of normal temperature (ambient temperature) such that its outer free ends 45 are located in a plane above the central region 39 or 44 of the control plate 38 or bimetal strip 37. The outer free ends 45 of the concave bimetallic strip 37 are held in slots 47 of the screw cap 14 so as to be longitudinally movable.

If the closure cap 10 is in the state screwed onto the socket 11 of the expansion tank 12, as is partially shown in FIG. 1A, a preselected critical excess temperature in the socket 11 or expansion tank exposed, this excess temperature is transferred to the temperature-dependent control element, ie the bimetallic strip 37, so that it deforms from its concave shape into a flat, straight shape under the influence of this excess temperature. This means that the central region 44 of the bimetallic plate 37 moves against the action of the compression spring 36 and thus relieves the pressure on the control plate 38 from the pressure of the compression spring 36. If the bimetal strip 37 and the control plate 38 are connected to one another in the central region 39, 44, the control plate 38 is raised by the bimetal strip 37. This means that the free ends 43 of the offset 42 of the control plate 38 come free from the upper, for example toothed, ring surfaces of the ring collar 38. In other words, the external thread connector 21 and the screw cap 14 can be rotated relative to one another, ie the external thread connector 21 is no longer carried along by the screw cap 14 when it is turned; the screw cap 14 turns hollow.

If the bimetal strip 37 and the control plate 38 are not connected to one another in the axial direction, the control plate 38 is only relieved of pressure when the bimetal strip 37 deforms when an overtemperature occurs. In this case, it is expedient to provide the connection between the free ends 43 of the offset 42 of the control plate 38 and the upper surface of the collar 31 of the external thread connector 21 by means of a toothed ratchet connection, so that when the control plate 38 is relieved of pressure and when the screw cap 14 is rotated, the latter becomes itself can move with its outer free ends over the toothed surface of the collar 31.

The second exemplary embodiment of the present invention shown in FIGS. 2A and 2B differentiates 1A and IB in the following: The compression spring 36 and control plate 38 have the same shape as in the first embodiment, but the compression spring 36 is supported with its other end directly on the control plate 38. A circular bimetal plate 37 '(see FIG. 2B) is arranged on the underside of the control plate 38. The central region 44 'of the bimetallic plate 37' bears against the underside of the control plate 38, while the outer edge 51 of the bimetallic plate 37 'is held in an annular groove 52 on the upper side of the valve housing 17.

At ambient temperature, the bimetallic plate 37 'is shaped and arranged such that, under the pressure of the compression spring 36, the control plate 38 can engage with its outer ends 41 of its offset 42 in the top of the collar 31 of the external thread connector 21'. If excess temperature occurs, the bimetallic plate 37 'deforms such that its central region 44' moves in the axial direction counter to the action of the compression spring 36 and thereby raises the control plate 38, so that its outer ends 41 from the collar 31 'of the external thread connector 21 'get out. When the screw cap 14 'is rotated, the external threaded connector 21' cannot therefore be rotated as well.

In the third exemplary embodiment of the present invention shown in FIGS. 3A and 3B, there is no separate control element, but the function of the control element 38 of the two above-described exemplary embodiments is taken over by the free ends 61 of a temperature-dependent control element which has the shape of a bimetal plate 37 " Elongated bimetallic plate 37 "has two arms 56 and 57 which are integrally connected to one another and which near their connection area are provided with recesses 58, 59, with which they are held in a respective projection 60 on the inside of the screw cap 14 ″. The free ends 61 of the bimetallic plate arms 56, 57 are provided with a toothing 63 which fits into a corresponding one Teeth 64 on the top of the collar 31 of the external thread connector 21 "can engage.

As can be seen in FIG. 3A, the two bimetallic plate arms 56, 57 are shaped at normal temperature in such a way that their arms 56, 57 bulge downwards relative to the central connection area, that is to say the bimetallic plate 37 "is convex Expansion tank, the bimetallic plate 37 ″ deforms into an approximately straight plane, which means that the free ends 61 move upward in a pivoting or deforming manner. As a result, the teeth 63, 64 of the bimetallic plate arms 56, 57 and the collar 31 "are free from one another. Rotation of the external threaded connector 21" when the screw cap 14 "is turned is therefore no longer possible; the screw cap 14" turns hollow.

In the last-mentioned third exemplary embodiment of the present invention, it is also possible to make the bimetallic plate 37 "cruciform if the screw cap 14" is provided with a cruciform four-armed handle bar instead of an elongated two-armed arm.

In the fourth exemplary embodiment of the present invention shown in FIG. 4, the temperature-dependent unscrewing protection 120 is in the form of one or more temperature-dependent control elements which are arranged uniformly distributed over the circumference of the screw cap 114 one or more bimetal strips or plates 137 are formed. The bimetal strip or plate 137 is clamped in a recess 148 in the screw cap 114 on the inside at both ends or on the edge side. The bimetallic strip 137 or the bimetallic plate is fitted in the center between the one or more clamping receptacles 149 with a control element designed as a control cam 138, which is directed towards the externally threaded part 121. The external thread part 121 has a number of axial bores 153 corresponding to the number of bimetallic strips or plates 137 or the number of control cams 138, into which the or one of the control cams 138 can dip, so that a positive connection between screw cap 114 and external thread part 121 is produced. At normal temperature in the container neck 11, the bimetallic strip or plate 137 has the position shown in FIG. 4, in which a rotary connection is made between the screw cap 114 and the external thread part 121. If the temperature in the connecting piece 11 is too high, the bimetallic strip or plate 137 deflects into the position shown in dashed lines, in which the control cam 138 comes out of the axial bore 153 and thus releases the positive-locking rotary connection. The screw cap 114 now rotates hollow with respect to the external thread part 121.

In the fifth exemplary embodiment of the present invention shown in FIG. 5, the closure cover 110 'on the inside of the screw cap 114' has a temperature-dependent unscrew protection 120 'with a temperature-dependent control element in the form of a bimetallic element 137'. The bimetal element 137 'is fastened approximately centrally to the underside of the screw cap 114' and has one or more arms 154 'which are arranged uniformly distributed over the circumference and whose free end cooperates with an axially extending control cam 138'. The control cam 138 'can engage with its front end 155' facing the external thread part 121 'in an axial bore 153' of the screw cap 114 ', while its rear end 156' engaging in an axial recess 158 'of the screw cap 114' on a back pressure spring 159 'supports. At normal temperature, there is a positive, rotationally fixed connection between the screw cap 114 'and the external thread part 121' in that the front end 155 'of the control cam 138' engages in the axial bore 153 'under the action of the back pressure spring 159'. At a correspondingly high temperature, the bimetallic arm 154 'of the bimetallic element 137' deflects against the action of the back pressure spring 159, so that the front end 155 'of the control cam 138' is released from the axial bore 153 '. The screw cap 114 'rotates hollow with respect to the external thread part 121'.

In the exemplary embodiments of the present invention illustrated in FIGS. 6 to 11, the temperature-dependent control element of the temperature-dependent unscrew protection 220, 220 ', 320, 320', 420 or 420 'of the closure cover 210, 210', 310, 310 ', 410 or 410 'is formed by a memory spring 237, 237', 337, 337 ', 437 and 437'.

In the sixth exemplary embodiment of the present invention shown in FIG. 6, a control pin 238 is arranged in an axial recess 258 which is accessible from the inside of the screw cap 214, around whose rear end 256 a return pressure spring 259 and around its front end 255 the memory spring 237 is arranged. The back pressure spring 259 is supported between the bottom of the axial recess 258 and a collar 257 of the control pin 238, while the Memory spring 237 is supported between the collar 257 and a front abutment 254. At normal temperature, the front end 255 of the control cam 238 is pressed under the action of the back pressure spring 259 into an axial bore 253 in the external thread part 221, so that a rotationally positive connection between the screw cap 214 and the external thread part 221 is formed. At a corresponding predetermined high temperature, the memory spring 237 expands and presses the control cam 238 into the axial recess 258 in the screw cap 214 against the action of the back pressure spring 259, so that the front end 255 of the control cam 238 is released from the axial bore 253 in the external thread part 221. The screw cap 214 rotates hollow with respect to the external thread part 221. It goes without saying that such a temperature-dependent control element in the form of the memory spring 237 can also be present at a number of points, preferably evenly distributed over the circumference, instead of at one point on the circumference of the closure cover 210.

In the seventh exemplary embodiment of the present invention shown in FIG. 7, the back pressure spring 259 'and the memory spring 237' are accommodated at different locations, namely in the screw cap 214 'or in the external thread part 221'. While the back pressure spring 259 'acts on a control pin or cam 238', the memory spring 237 'presses on a counter pin 265', which in turn presses its front end 266 'against the front end 255' of the control cam 238 '. Depending on the temperature prevailing in the connecting piece 11, either the front end 266 'of the counter bolt 265' or the front end 255 'of the control cam 238' is located in the axial bore 253 'of the external thread part 221'. In the case shown in FIG. 7, there is idling between the screw cap 214 'and the external thread part at a given inappropriately high temperature 221 'given that the memory spring 237' with its force predetermined by the high temperature pushes the control cam 238 'against the action of the back pressure spring 259'. The memory spring 237 'with the mating pin 265' is held in a receiving housing 267 'arranged at the edge in the external thread part 221'. It goes without saying that here too, instead of a temperature-dependent control element, a plurality of such temperature-dependent control elements can be provided distributed over the circumference at a specific point on the circumference of the closure cover 210.

In the eighth exemplary embodiment of the present invention, shown in FIG. 8, of a closure cover 310, the temperature-dependent control element designed as a memory spring 337 is arranged axially within the valve 315. In a pot-like part 371 of the valve 315 arranged above a valve inner seal 365, a collar 357 of a connecting bolt 373 can be moved axially, the connecting bolt 373 between its collar 357 and the base of the pot-like part 371 being acted upon by the memory spring 337 and one covering the pot-like part Penetration 372 penetrates. The horizontal connecting leg of a control element 338 bent into a U-shape rests on the end of the axial bolt 373 projecting above the bushing 372 and is acted upon by a back pressure spring 359 which is supported at the other end on the inner surface 24 of the screw cap 314. Lateral legs 375 of the control element 338 projecting from the external thread part 321 lie with their finger-like ends 376 opposite an axial bore 353 in the external thread part 321 and engage at normal temperature in the socket 11 for the rotationally fixed connection of the screw cap 314 and the external thread part 321. At a predetermined high temperature value, the memory spring 337 expands against the action of the back pressure spring 359, so that the axial Bolt 373 presses the control element 338 against the action of the back pressure spring 359 upwards towards the inner surface 24 of the screw cap 314 and thus the finger-like ends 376 of the control element 338 come out of the axial bores 353. The screw cap 314 now turns hollow with respect to the external thread part 321. It goes without saying that the control element 338 also has more than two lateral legs 375, that is to say can be star-shaped or cross-shaped, for example.

In the ninth exemplary embodiment of the present invention of a closure cover 310 ′ shown in FIG. 9, the memory spring 337 ′ is seen from the screw cap 314 ′ beyond the valve inner seal 365 ′. For this purpose, the axial connecting pin 373 'penetrates the seal 365', so that the collar 357 'of the pin 373' is held axially movable within the cup-shaped seal 365 '. A shell-shaped sealing sleeve 366 ', on which the sleeve 366' is supported indirectly, is provided for the passage of the bolt 373 'through the seal 365'. The operation of this ninth embodiment corresponds to that of the eighth embodiment.

In the tenth exemplary embodiment of the present invention of a closure lid 410 shown in FIG. 10, the temperature-dependent control element 437 of the temperature-dependent unscrewing lock 420 is introduced into the socket 11 of the container in question, which means that, at a predetermined high temperature value, a blockage, that is to say a rotationally fixed connection between the screw cap 414 and the nozzle 11 of the container is reached. The temperature-dependent control element is also formed here by a memory spring 437, which, as in the exemplary embodiment in FIG. 6, together with a Back pressure spring 459 surrounds an inner or outer end 455, 456 of a control bolt 438. The lower or inner spring in FIG. 10 is the memory spring 437, which is supported at one end at the base of an axial recess 458 in the socket 11 and at the other end at a collar 457 of the control cam 438. In contrast, the back pressure spring 459 is supported at one end on the collar 457 and at the other end on a ring insert 460 of the axial recess 458. The screw cap 414 has an axial blind hole or recess 453 which is accessible from the inside and into which the tip of the front end 455 of the control bolt 438 can engage for the rotationally fixed connection and thus blocking of the screw cap 414. This happens at high temperature, in which the memory spring 437 expands against the action of the back pressure spring 459 and thereby pushes the control pin 438 into the axial blind hole 453. Here, too, it is possible to provide several control elements distributed over the circumference of the nozzle 11 instead of the one temperature-dependent control element.

The eleventh embodiment of the present invention, shown in FIG. 11, of a closure cap 410 corresponds essentially to the embodiment of FIG. 10, with the exception that the memory spring 437 'and also the back pressure spring 459' in the nozzle 11 continue downward or inward towards the water surface of the concerned container are relocated. This only requires an extension of the control pin 438 '.

In the illustrated embodiments of the closure cover 10, 10 ', 10 ", 110, 110', 210, 210 ', 310, 310', 410 and 410 ', it is thus either achieved that when a predetermined excessively high temperature occurs within the connection piece 11 or reservoir of External threaded connector can no longer be moved by the screw cap, namely that by deforming the temperature-dependent control element, the control plate or the temperature-dependent control element itself is released from the non-rotatable connection with the external threaded connector of the closure cover, or a rotationally locked locking between the screw cap and the container connector is achieved. At normal temperature, the temperature-dependent control element returns to its initial position, so that in the former case the non-rotatable connection between the screw cap and the external threaded connector is reached again and in the second case the locking is released.

In another embodiment of the present invention, which is not shown in the drawing, the temperature-dependent control element is not provided between the screw cap and the external threaded connector, but between the screw cap and the valve housing. The external thread connector is integral with the screw cap and the valve housing is arranged within the expansion tank connector 11 in a rotationally fixed manner but movable in the axial direction. The function is as follows: At ambient temperature, the valve housing can be rotated relatively with respect to the screw cap or the external threaded connector, the valve being taken along in the axial direction when the closure cap is unscrewed. If, on the other hand, an excess temperature occurs when the closure cap is screwed on, the temperature-dependent control element brings about a rotationally fixed connection or locking between the screw cap and the valve housing, which is itself held in the connecting piece 11 in a rotationally fixed manner. This means that the screw cap cannot be turned. Although certain types of bimetallic or memory springs have been shown and described in the foregoing, it goes without saying that other shapes, such as flat, spiral, straight or the like, are also possible for both the bimetal spring and the memory spring.

The measures according to the invention can also be implemented with a closure cover which is connected in the manner of a bayonet lock to a connecting piece. The engagement part described as a threaded part is designed as a plug-turn part, while the screw cap is designed as a plug-in and turn cap.

It goes without saying that such a sealing cover can be used not only on components of cooler or cooling systems but also on components of heating systems.

Claims

1. On a stationary nozzle (11), for example. A motor vehicle cooler, an expansion tank of cooling or heating systems or the like. To be fastened, preferably screwable or push-fit and rotatable closure cover (10, 110, 210, 310, 410), with a Screw or plug and twist cap (14, 114, 214, 314, 414) and a rotatable engagement part (21, 121, 221, 321, 421), within which a valve (15 ) is arranged concentrically and rotatably with respect to the cap, the valve (15) having a sealing element (27), which comes into sealing connection with the stationary connecting piece (11) when the closing cover is applied, characterized in that the closing cover (10, 110, 210, 310, 410) in the state applied to the stationary connection piece (11) by means of a temperature-dependent control element (37, 137, 237, 337, 437) can be secured against removal, preferably unscrewing or twisting, whereby mi By means of the temperature-dependent control element, a coupling part (38, 61, 138, 238, 338, 439) is essentially axially movable.

2. Closure cap according to claim 1, characterized in that the valve (15) in the fixed connection piece (11) is held non-rotatably and that a non-rotatable connection between the cap (14) and valve (15) can be reached at excess temperature with the temperature-dependent control element.

3. Cap according to claim 1, characterized in that the engagement part (21, 121, 221, 321) is rotatably held relative to the cap (14, 114, 214, 214) and that with the aid of the temperature-dependent control element (37, 137, 237, 337) a rotationally fixed coupling can be achieved at normal temperature.

4. Cap according to claim 1, characterized in that the engagement part (421) with the cap (414) is in one piece and that with the help of the temperature-dependent control element (437) a rotationally fixed coupling of the cap and nozzle (11) can be reached at excess temperature.

5. Cap according to at least one of the preceding claims, characterized in that the temperature-dependent control element is a bimetal element (37, 137).

6. Cap according to at least one of claims 1 to 4, characterized in that the temperature-dependent control element is a memory spring (237, 337, 437).

7. Cap according to at least one of claims 1, 3, 5 or 6, characterized in that as a control element in the cap (14) a control plate (38) is rotatably held in the circumferential direction and movable in the axial direction that at least one end of the control plate (38) can be connected to the engagement part (21) in a rotationally fixed manner and that the temperature-dependent control element (37) engages on the control plate (38).

8. Cap according to claim 7, characterized in that the control plate (38) against the action of a compression spring (36) from temperature-dependent control element (37) is movable.

9. Cap according to one of claims 5 to 8, characterized in that a cranked end of the control plate (38) faces the engaging part (21) and engages a bimetallic element (37) on its area facing away from it.

10. Cap according to claim 9, characterized in that the bimetallic element is a bimetallic strip (37), the outer free end is clamped in the cap (14) and the inner region (44) rests on the control plate (38).

11. Cap according to claim 10, characterized in that the bimetallic strip (37) is connected to the control plate (38).

12. Cap according to claim 9, characterized in that the bimetallic element is a bimetallic disc (37 '), the peripheral edge (51) is clamped in an upper region (44') of the valve (15) and the central region on the underside of the control plate (38 ') is present.

13. Cap according to at least one of claims 1, 3 or 4, characterized in that a bimetallic element (37 ") is rotatably held in at least one area in the cap (14") and at least one other area facing away from it as a coupling part (61 ) is designed for rotationally fixed engagement with the engagement part (21 ").

14. Cap according to claim 13, characterized in that the bimetallic element (37 ") over the circumference of the cap (10") has arms (56, 57) arranged uniformly distributed.

15. Cap according to claim 13 or 14, characterized in that the rotationally fixed engagement between the bimetallic element (37 ") and the upper free end of the engaging part (21") is carried out by an interlocking toothing (63, 64).

16. Closure cover according to one of claims 3 and 5, characterized in that the bimetallic element (137, 137 ') is provided with a control cam (138, 138') as a coupling part.

17. Closure cover according to claim 16, characterized in that the control cam (138) is arranged centrally on the bimetallic element (137) and the bimetallic element is clamped at both ends or on the peripheral edge in the cap (114).

18. Cap according to claim 16, characterized in that the control cam (138 ') is arranged at a free end of the bimetallic element (137').

19. Cap according to at least one of claims 16 to 18, characterized in that the control cam (138, 138 ') cooperates with an axial recess (153, 153') in the external thread part (121, 121 ').

20. Closure cover according to one of claims 3 or 4 and 6, characterized in that the memory spring (237, 337, 437) cooperates with an axial control cam or bolt (138, 238, 438).

21. A closure cap according to claim 20, characterized in that one or more memory springs (137, 237), 437) with control cams or bolts (138, 238, 438) acted on by return pressure springs (159, 259, 459) at an eccentric area of the Closure cover (110, 220, 420) is or are.

22. A closure cap according to claim 20 or 21, characterized in that both memory spring (237, 437) and back pressure spring (259, 459) in the cap (214) or in the socket (11) are housed.

23. Closure cover according to claim 20 or 21, characterized in that the memory spring (237 ') and back pressure spring (259') are accommodated separately from one another in the cap (214 ') or in the external thread part (221').

24. Cap according to claim 22, characterized in that the memory spring (437, 437 ') is arranged near or in the region of the liquid surface in the container or container neck (11).

25. Cap according to one of claims 3 and 6, characterized in that the memory spring (337, 337 ') is arranged in the center and cooperates with a U-shaped control plate (338, 338').

26. Closure cover according to claim 25, characterized in that the memory spring (337, 337 ') is arranged within the valve (15) and engages on the control plate (338, 338 ') via a connecting bolt (373, 373').

27. Versσhlußdeckel according to at least one of claims 20 to 26, characterized in that the control cam (138, 238) or axial control finger (376) of the control plate (338) cooperates with an axial recess (253, 353) in the external thread part.