Swimming pool cleaner

Abstract

A swimming pool cleaner which is located inside a passage in a body of the cleaner, which includes a diaphragm with a first end anchored by means of a resilient ring to the body, and a second end, into which a pipe is inserted, which is directly engaged with the body.

1 . A swimming pool cleaner which includes a body through which is formed a passage with an inlet, an opposing outlet, and at least one stop formation, a diaphragm, with opposed first and second open ends, which is located in the passage, support structure at the first end of the diaphragm, and a pipe which is engaged with the second end of the diaphragm and which is movable from the inlet through the passage, thereby to bring at least one limiting formation on the pipe or diaphragm into abutment with the stop formation. 
     
     
         2 . A pool cleaner according to  claim 1  wherein the support structure is resiliently flexible, to a limited extent, in an axial direction of the passage, to compensate for a tendency of the diaphragm to vary in length between the first and second ends. 
     
     
         3 . A pool cleaner according to  claim 2  wherein the support structure is a ring which is separately formed from the diaphragm and which is engageable with the diaphragm in a first orientation in which the ring has a first resiliently flexible characteristic or in a second orientation in which the ring has a second resiliently flexible characteristic which differs from the first resiliently flexible characteristic. 
     
     
         4 . A pool cleaner according to  claim 1  which includes:
 (a) a plurality of the stop formations, or 
 (b) a plurality of the limiting formations, or 
 (c) a plurality of the stop formations and of the limiting formations. 
 
     
     
         5 . A pool cleaner according to  claim 1  which includes a plurality of the stop formations and the limiting formation, on the pipe or diaphragm, is resiliently deformable so that it can be moved successively to the respective stop formations. 
     
     
         6 . A pool cleaner according to  claim 5  wherein each stop formation is a shallow circular groove. 
     
     
         7 . A pool cleaner according to  claim 1  wherein the pipe and body include interengageable screw formations so that, by screwing the pipe relative to the body, an axially directed force in the diaphragm is varied. 
     
     
         8 . A pool cleaner according to  claim 1  wherein the at least one limiting formation is a groove on the diaphragm and the stop formation is a rib in the body which is engageable with the groove. 
     
     
         9 . A pool cleaner according to  claim 2 , which includes:
 (a) a plurality of the stop formations, or   (b) a plurality of the limiting formations, or   (c) a plurality of the stop formations and of the limiting formations.   
     
     
         10 . A pool cleaner according to  claim 2 , which includes a plurality of the stop formations and the limiting formation, on the pipe or diaphragm, is resiliently deformable so that it can be moved successively to the respective stop formations. 
     
     
         11 . A pool cleaner according to  claim 2 , wherein the pipe and body include interengageable screw formations so that, by screwing the pipe relative to the body, an axially directed force in the diaphragm is varied.