Sealing cover with an anti-unscrew safety device

Abstract

The invention relates to a sealing cover ( 11 ) for openings radiators in vehicles. Said cover comprises an outer part ( 10 ) which is provided with a sealing element ( 13 ) which can be connected to a container pipe, and a grip element ( 12 ) which is rotationally maintained in relation thereto, and a rotational-prevention device which comprises a coupling insert ( 80 ) which is rotationally fixed with the handling element ( 12 ) and which can be axially engaged or disengaged in the sealing element ( 13 ) for detachably rotationally fixing the sealing and the grip element. The aim of the invention is to produce a sealing cover which can only be unscrewed by a specialist and not an amateur when the anti-unscrew safety device is activated. As a result, an axial displacement of the grip element ( 12 ) is possible in at least a central area in relation to the sealing element ( 13 ) when the coupling insert ( 80 ) is disengaged and the grip element ( 13 ) is simultaneously rotated, a rotating a sealing connection ( 95 ) in an axially sealing and radially active manner occurring on a peripheral area.

1 . A sealing cap ( 11 ) for openings of containers, particularly motor vehicle radiators, having an outer cap part ( 10 ), which has a closure element ( 13 ) that can be connected to a container pipe and a grip element ( 12 ) that is retained rotatably relative to it; having a rotation preventer, which is provided with a coupling insert ( 80 ) that is axially engageable with and disengageable from the closure element ( 13 ) and is held in a manner fixed against relative rotation in the grip element ( 12 ), for releasable rotationally fixed connection of the closure element and grip element; and having a valve assembly ( 15 ), which has a valve body ( 17 ) that can be moved axially back and forth, for opening and closing flow connections between the container interior and the container exterior as a function of predetermined values of the internal container pressure, characterized by an axial mobility of the grip element ( 12 ), at least in its central area, relative to the closure element ( 13 ) whenever, upon simultaneous rotation of the grip element ( 13 ), with the coupling insert ( 80 ) disengaged, an axially engaging and radially acting rotationally fixed connection ( 95 ) is made possible on a circumferential region.  
     
     
         2 . The sealing cap of  claim 1 , characterized in that the grip element ( 12 ) has an inward-pointing axial annular attachment ( 76 ), which on a circumferential region has a lug ( 78 ) protruding from the face end, and that the closure element ( 13 ), on a circumferential region of a radial ring, has an axial indentation ( 97 ), which can be engaged by the lug ( 78 ).  
     
     
         3 . The sealing cap of  claim 2 , characterized in that the closure lug ( 78 ) and the axial closure recess ( 97 ) have oblique faces ( 79 ,  99 ) contacting one another in the direction of the opening motion.  
     
     
         4 . The sealing cap of at least one of claims  1 - 3 , characterized in that the grip element ( 12 ) is kept spaced apart from the closure element ( 13 ) by an axially acting compression spring ( 73 ), and the grip element ( 12 ) is axially held on the pressure element ( 13 ) in the direction of action of the compression spring ( 73 ).  
     
     
         5 . The sealing cap of at least one of one of the foregoing claims, characterized in that an engagement motion of the disengaged coupling insert ( 80 ) is associated with the axial motion of the grip element ( 12 ) relative to the closure element ( 13 ).  
     
     
         6 . The sealing cap of  claim 5 , characterized in that the disengaged coupling insert ( 80 ) rests on a stationary stop ( 28 ) radially inside the rotationally fixed connection.  
     
     
         7 . The sealing cap of  claim 5  or  6 , characterized in that the coupling insert ( 80 ) is engageable only over an axial partial region.  
     
     
         8 . The sealing cap of at least one of claims  5 - 7 , characterized in that the elements of the coupling insert that axially engage the inside of one another or engage side by side in the engagement motion of the coupling insert ( 80 ) are provided, on their ends oriented toward one another, with oblique faces acting in the direction of the opening motion.  
     
     
         9 . The sealing cap of at least one of one of the foregoing claims, characterized in that the axial disengagement and engagement motion of the coupling insert ( 80 ) is derived from the pressure-dependent axial motion of the valve body ( 17 ) of the valve assembly ( 15 ).  
     
     
         10 . The sealing cap of  claim 9 , characterized in that the coupling insert ( 80 ) is seated on the valve body ( 17 ).  
     
     
         11 . The sealing cap of at least one of one of the foregoing claims, characterized in that the coupling insert ( 80 ) on its outer circumference and the closure element ( 13 ) on its inner circumference are provided with an axially extending set of teeth ( 86 ,  88 , respectively).  
     
     
         12 . The sealing cap of at least one of one of the foregoing claims, characterized in that the coupling element ( 80 ) is subjected to a compression spring ( 81 ), which is braced on the inside of the grip element ( 12 ).  
     
     
         13 . The sealing cap of  claim 12 , characterized in that the compression spring ( 81 ) is disposed radially inside the coupling element ( 82 ) of the coupling insert ( 80 ) and the closure element ( 13 ).