Spring barrel pumps

Abstract

Spring barrel pump characterized by the fact that the bores ( 2 ) in which the pistons ( 4 ) move are provided by way of the spring barrel ( 1 ) diametrically to its axis (XX).

1 . Spring barrel pump of the type in which the pistons ( 4 ) move into bores ( 2   a ,  2   b ) provided through said spring barrel ( 10 ), diametrically to its axis (XX), by moving away under the effect of the centrifugal force and by drawing closer by resting on an eccentric ring ( 5 ), characterized by the fact that said bores ( 2   a ,  2   b ) communicate: on the one hand, with the supply duct ( 8 ) by means of ducts ( 6   a ,  6   b ) emptying into a chamber ( 7 ) that is located behind the spring barrel ( 1 ) into which said duct ( 8 ) empties; on the other hand, with the conveyor duct ( 13 ) by means of a collector ( 9 ), applied against the rear surface ( 11 ) of the spring barrel ( 1 ) by a spring ( 10 ), whereby this collector ( 9 ) is equipped with a cup ( 12 ) that communicates with said conveyor duct ( 13 ); whereby said collector ( 9 ) is eccentric relative to the axis (XX) of the spring barrel ( 1 ), such that each of the ducts ( 6   a ,  6 b) empties into the chamber ( 7 ) during a half-turn and into the cup ( 12 ) during a half-turn. 
   
   
       2 . Pump according to  claim 1 , wherein the collector ( 9 ) is balanced hydrostatically so as to be kept—by pressure—resting against the rear surface ( 11 ) of the spring barrel ( 1 ). 
   
   
       3 . Pump according to  claim 1 , wherein the pump is a variable-capacity pump.