Pool cleanig robot

Abstract

A pool cleaning robot adapted for climbing a sidewall of a pool and comprising a bottom and two side panels. The robot is adapted for moving in a direction substantially parallel to the side panels. At least one of the side panels comprises a freely-rotating roller located adjacent to the bottom of the robot.

1 . A pool cleaning robot adapted for climbing a sidewall of a pool, said robot comprising a bottom and two side panels, said robot being adapted for moving in a direction substantially parallel to said side panels, at least one of said side panels comprising a freely-rotating roller being located adjacent to the bottom of the robot. 
   
   
       2 . A pool cleaning robot according to  claim 1 , further comprising a weight imbalance. 
   
   
       3 . A pool cleaning robot according to  claim 1 , wherein at least the side panel on the heavier side of the robot comprises said roller. 
   
   
       4 . A pool cleaning robot according to  claim 1 , wherein said roller is a wheel. 
   
   
       5 . A pool cleaning robot comprising two side panels and a front end therebetween and being adapted for moving generally parallel to said side panels; said robot being adapted for moving in a first direction along the floor of a pool which is perpendicular to an expected sidewall of the pool, and capable of moving in a second direction along the floor of the pool which is oriented at an acute angle to said first direction; at least one of said side panels comprises at least one projection whose leading area is disposed remote from the robot at least in a direction which is perpendicular to the direction of movement of the robot, and projects beyond any other part of the robot in the first direction, at least when the front end of the robot faces in the second direction. 
   
   
       6 . A pool cleaning robot according to  claim 5 , said projection being formed to ensure that, when the robot approaches the wall in said second direction, said robot pivots thereabout in a direction such that a front end of the robot is brought parallel to the sidewall. 
   
   
       7 . A pool cleaning robot according to  claim 5 , wherein said at least one projection is located substantially adjacent to the front end of the robot. 
   
   
       8 . A pool cleaning robot according to  claim 5 , further comprising a weight imbalance. 
   
   
       9 . A pool cleaning robot according to  claim 8 , wherein at least the side panel on the lighter side of the robot comprises said projections. 
   
   
       10 . A pool cleaning robot according to  claim 5 , wherein said at least one projection is made of a high-friction elastomer material. 
   
   
       11 . A pool cleaning robot according to  claim 5 , wherein said at least one projection is formed integrally with said side panel. 
   
   
       12 . A pool cleaning robot according to  claim 5 , wherein said at least one projection is detachably attachable to said side panel. 
   
   
       13 . A filter unit for use with a pool cleaning robot, said filter unit comprising a bottom panel having at least one robot inlet, and a rigid frame having frame walls, one of said frame walls being a top wall, and all other frame walls being disposed substantially transverse to the bottom panel and extending between the top wall of the frame and the bottom panel; at least a part of one of said frame walls constituting a filter detachably secured to the frame; said frame and at least a portion of said bottom panel defining therebetween an enclosed volume in fluid communication with at least one of said robot inlets. 
   
   
       14 . A filter unit according to  claim 13 , wherein said robot inlet is formed within said portion of the bottom panel. 
   
   
       15 . A filter until according to  claim 13 , wherein said filter comprises a rigid filter screen. 
   
   
       16 . A filter unit according to  claim 13 , wherein said frame comprises at least one cleaning outlet. 
   
   
       17 . A filter unit according to  claim 16 , wherein said at least one cleaning outlet is adapted, when the filter unit is installed in a pool cleaning robot, to be blocked to exit therethrough of water.