Dispensing pump made of plastic for paste-like materials

Dispensing pump made of plastic for dispensing paste-like materials from a paste container, the dispensing pump comprising:

• a dimensionally stable, upper housing part with an annular wall forming a stationary part;
• a dimensionally stable lower housing part, which is coaxial to said upper housing part and can be connected to the paste container;
• an elastic bellows acting as a pumping member, said elastic bellows being connectingly arranged between said upper housing part and said lower housing part, wherein said upper housing part is telescopically movably guided in said lower housing part, said bellows having an upper, cylindrical wall section which is sealingly in contact with said annular wall, a paste channel being located within said annular wall, said bellows having a lower end section sealingly in contact with a collar of a radial partition of the lower housing part;
• a hollow body inserted into said upper housing part, said hollow body having a closable discharge opening, said hollow body cooperating with said upper housing part to form a paste storage space, said paste storage space being located in the immediate vicinity of the discharge opening and being in connection with said paste channel, said hollow body being formed of a dimensionally stable plastic and having a front wall which extends at right angles to a discharge axis of the said discharge opening and forms a limiting side of the said paste storage space, a cylindrical attachment with a vent hole, said cylindrical attachment being concentric to said discharge axis of said discharge opening;
• and
• an additional hollow body made of an elastic plastic, which includes a diaphragm wall with a plug-like closing part attached to said cylindrical attachment by means of a cylindrical wall part made in one piece with said diaphragm wall, said plug-like closing member intersecting a longitudinal housing axis at an acute angle and being coaxial to a discharge opening, and said lower housing part being provided with a suction valve at said diaphragm wall.