Air extractor pump for waterbeds

Abstract

The invention relates to an air extractor pump for waterbeds comprising a piston ( 1 ) held with longitudinal slideability in a cylinder ( 4 ), wherein the piston ( 1 ) and the cylinder ( 4 ) each are equipped at their back ends as seen in insertion direction ( 3′ ) with a valve flap ( 9, 17 ) closeably covering a through-bore ( 33 ) each, wherein the front end of the piston ( 1 ) as seen in insertion direction ( 3 ′) is equipped with a discharge bore ( 5 ), and wherein at the back end of the cylinder ( 4 ) as seen in insertion direction ( 3′ ), a thread ( 32 ) is provided wherewith it can be screwed onto a correlated screw neck ( 12 ) of a filler neck ( 10 ) of a waterbed, wherein the valve flaps ( 9, 17 ) are attached in the area of separately constructed valve cases ( 15, 16 ), wherein the piston-side valve case ( 16 ), as well as the cylinder-side valve case ( 15 ) are each equipped with a plug-in piece ( 19, 24 ) engaging with the plug-in receptacles ( 29, 30 ) of the piston ( 1 ) or the cylinder ( 4 ), respectively, in a correlated, sealed snap-in connection. The object is to create an air extractor pump functioning with operational reliability, which can be assembled free from adhesive and manufactured at lower cost and with greater functional reliability.

1 . An air extractor pump for waterbeds comprising a piston ( 1 ) held with longitudinal slideability in a cylinder ( 4 ), wherein the piston ( 1 ) and the cylinder ( 4 ) each are equipped at their back ends as seen in insertion direction ( 3 ′) with a valve flap ( 9 ,  17 ) closeably covering one through-bore ( 33 ) each, wherein the front end of the piston ( 1 ) as seen in insertion direction ( 3 ′) is equipped with a discharge bore ( 5 ), and wherein at the back end of the cylinder ( 4 ) as seen in insertion direction ( 3 ′), a thread ( 32 ) is provided wherewith it can be screwed onto a correlated screw neck ( 12 ) of a filler neck ( 10 ) of a waterbed, wherein the valve flaps ( 9 ,  17 ) are attached in the area of separately constructed valve cases ( 15 ,  16 ), and wherein the piston-side valve case ( 16 ) as well as the cylinder-side valve case ( 15 ) each are equipped with a plug-in piece ( 19 ,  24 ) engaging with the plug-in receptacles ( 29 ,  30 ) of the piston ( 1 ) or the cylinder ( 4 ), respectively, in a correlated, sealed snap-in connection. 
   
   
       2 . An air extractor pump according to  claim 1 , wherein the cylinder-side valve case ( 15 ) is equipped with a radially exterior plug-in piece ( 24 ) comprising several parallel, circumferential, circular bulges ( 41 ), said circular bulges ( 41 ) snapping sealingly into the correlated plug-in receptacle ( 30 ) on the interior of the cylinder ( 4 ). 
   
   
       3 . An air extractor pump according to  claim 2 , wherein the piston-side valve case ( 16 ) is equipped with a radially exterior plug-in piece ( 19 ) comprising several circumferential, parallel, and equidistant ribs, said ribs snapping sealingly into the correlated plug-in receptacle ( 29 ) on the interior of the piston ( 1 ). 
   
   
       4 . An air extractor pump according to  claim 3 , wherein the cylinder-side valve case ( 15 ) and/or the piston-side valve case ( 16 ) are held in the cylinder ( 4 ) and/or the piston ( 1 ), respectively, and protected from twisting by means of a twist protection ( 27 ,  40 ). 
   
   
       5 . An air extractor pump according to  claim 4 , wherein the twist protection ( 27 ,  40 ) between cylinder-side valve case ( 15 ) and cylinder ( 4 ) is achieved by constructing radially inward-pointing ridges ( 31 ) in the cylinder ( 4 ), said ridges ( 31 ) working in conjunction with correlated, longitudinally extending longitudinal grooves ( 40 ) on the external circumference of the valve case ( 15 ), thereby affixing the same and protecting it from twisting. 
   
   
       6 . An air extractor pump according to  claim 1 , wherein the respective valve flap ( 9 ,  17 ) is snapped into a correlated slit ( 23 ) in the bottom surface ( 18 ) of the respective valve case ( 15 ,  16 ) by means of ribs ( 22 ) in the manner of a snap-in connection. 
   
   
       7 . An air extractor pump according to  claim 1 , wherein the thread ( 32 ) to be screwed onto the screw neck ( 12 ) of the filler neck ( 10 ) of the waterbed is disposed as internal thread in the cylinder-side valve case ( 15 ). 
   
   
       8 . An air extractor pump according to  claim 7 , wherein the cylinder-side valve case ( 15 ) is equipped in the area of the internal thread ( 32 ) with a radially internal and axially outward-extended circular collar ( 25 ) radially supporting the screw neck ( 12 ) of the filler neck ( 10 ) while the said screw neck ( 12 ) is screwed on. 
   
   
       9 . An air extractor pump according to  claim 6 , wherein the valve cases ( 15 ,  16 ) are manufactured in an injection molding procedure.