Pumps and Methods for Using the Same

Abstract

A simplified delivery pump for fluid substances may include a cup unit having an extended rod positioned inside the cup unit, a first end of the extended rod being inserted and held in a housing at the second end of the cup unit, and an intermediate portion of the rod having a cylindrical profile with a diameter which is less than the diameter of the cavity of this shaft within which the portion of the rod extends, and that this mobile stop valve for the cavity of the shaft includes a continuous flexible lip which protrudes out from a second end of the rod towards the outside of this cylindrical chamber, this lip sliding on contact and sealing the cylindrical surface of the cavity of the shaft itself.

1 . A simplified delivery pump for fluid substances taken from a container of these substances, including a cup unit limiting a cylindrical chamber in which a hollow shaft extends, a plate mounted on a first open end of the cup unit, this cup unit having a space at its second end which can be sealed closed by a one-way valve and a housing for the insertion of one end of a suction tube for taking the fluid substance from the container, a sliding piston sealing the surface of the cylindrical chamber, this piston being joined to this shaft and being positioned close to a first end of the shaft inside this chamber and protruding out towards the inner surface of the cup unit, the plate having both a hole for the passage through it and for guiding this shaft and at least one holding element with this piston, a flexible body which acts to push this piston towards this plate, a mobile stop valve for the shaft cavity, characterized by the fact that an extended rod is positioned inside the cup unit, a first end of the extended rod being inserted and held in a housing at the second end of the cup unit, and that an intermediate portion of the rod has a cylindrical profile with a diameter which is less than the diameter of the cavity of this shaft within which this portion of the rod extends, and that this mobile stop valve for the cavity of the shaft includes a continuous flexible lip which protrudes out from a second end of the rod towards the outside of this cylindrical chamber, this lip sliding on contact and sealing the cylindrical surface of the cavity of the shaft itself. 
   
   
       2 . A pump in accordance with  claim 1 , characterized by the fact that this lip defines an indentation at the second end of this rod. 
   
   
       3 . A pump in accordance with  claim 2 , characterized by the fact that a shaped element protrudes from the top of the shaft which can be inserted in this indentation defined by the lip when the shaft is totally lowered within the pump, this shaped element being substantially complementary to this indentation. 
   
   
       4 . A pump in accordance with  claim 1 , characterized by the fact that this one-way valve consists of a flexible discoidal unit which protrudes out from the surface of this rod close to the first end and a holding surface at the second internal end of the cup unit, this discoidal unit preventing the passage of the fluid under rest or supply conditions. 
   
   
       5 . A pump in accordance with  claim 4 , characterized by the fact that this holding surface is sharp. 
   
   
       6 . A pump in accordance with  claim 1 , characterized by the fact that this one-way valve is a ball valve positioned between this cup unit and the bottom of this rod. 
   
   
       7 . A pump in accordance with  claim 1 , characterized by the fact that a drive and supply button is anchored on the outside of the second end of this shaft, this flexible element being positioned between this button and this plate. 
   
   
       8 . A pump in accordance with  claim 1 , characterized by the fact that this flexible element is a spring. 
   
   
       9 . A pump in accordance with  claim 1 , characterized by the fact that this shaft has, at its second end, at least one protrusion inside the cavity of the shaft itself, this protrusion being located in a position which can interfere with this protruding lip in order to open this valve when the piston is pressed in one of its limit positions. 
   
   
       10 . A pump in accordance with  claim 1 , characterized by the fact that this shaft has, at its second end, at least one groove in the inner surface of the cavity of the shaft itself, this groove being located in a position to cooperate with this protruding lip in order to open this valve when the piston is pressed in one of its limit positions. 
   
   
       11 . A pump in accordance with  claim 1 , characterized by the fact that this cup unit has, at its second end, inside the chamber, at least one protrusion which can interfere with this sliding piston in order to compromise its seal when it is pressed in one of its limit positions. 
   
   
       12 . A pump in accordance with  claim 1 , characterized by the fact that this plate is made together with a ring nut to permit the mounting of this pump on this container. 
   
   
       13 . A pump in accordance with  claim 1 , characterized by the fact that this plate holding element is ring-shaped and acts as a holding stop for this piston when it is in a rest position. 
   
   
       14 . A pump in accordance with  claim 1 , characterized by the fact that this shaft cavity has, near its first end, a conical guide.