초록 ▼

A dispenser for flowable media is provided, which operates in user-independent manner with respect to the pressure buildup and dosage quantity. On pressing on an operating head (35) a piston rod (29) is forced into a pump cylinder. As the pump chamber ( 52) is sealed by means of a delivery valve (51

A dispenser for flowable media is provided, which operates in user-independent manner with respect to the pressure buildup and dosage quantity. On pressing on an operating head (35) a piston rod (29) is forced into a pump cylinder. As the pump chamber ( 52) is sealed by means of a delivery valve (51), which operates in path-dependent manner as a slide valve, under the action of a spring (42) pressing on the piston collar (43), a pressure builds up in the pump chamber (52), which is released following a predetermined length of travel on opening the delivery valve. A relatively constant pressure can be obtained over the entire discharge phase through the pretension of spring (42).

대표청구항 ▼

What is claimed is: 1. A dispenser for discharge of flowable media comprising: a pump having a pump cylinder, said pump cylinder having a pump inlet with an intake valve; a piston with a piston rod being operable in an operating direction, said piston having: a delivery piston element having a spri

What is claimed is: 1. A dispenser for discharge of flowable media comprising: a pump having a pump cylinder, said pump cylinder having a pump inlet with an intake valve; a piston with a piston rod being operable in an operating direction, said piston having: a delivery piston element having a spring element to form a spring loaded delivery piston element; and a pump outlet including a delivery valve, said delivery valve being a path-control valve, and an outlet channel, said spring element being loaded in response to movement of the piston rod in the operating direction, said media being discharged in response to the opening of the delivery valve, the discharge being effected by the action of the spring loaded delivery piston element; whereby the discharge of said media being effected after said path controlled opening of the delivery valve without the need of moving the piston rod further in the operating direction. 2. A dispenser according to claim 1, wherein the delivery piston element is an annular piston collar, which is sealingly guided on the piston rod and in the pump cylinder. 3. A dispenser according to claim 2, wherein the piston rod is constructed from two telescoped hollow bodies, one hollow body having an outer circumference forming a path for the delivery piston element and the other hollow body containing a support for the spring element. 4. A dispenser according to claim 1 and further including a return spring element for loading the piston counter to the operating direction. 5. A dispenser according to claim 4, wherein at least one of said spring element and said return spring element is pretensioned. 6. A dispenser according to claim 1, wherein the piston rod comprises a displacement piston guided in the delivery piston element. 7. A dispenser according to claim 1, wherein the piston rod has a ventilation valve for a medium-containing container, the ventilation valve having a sealing surface for cooperating with an opening in a casing surface of the pump cylinder for providing a connection for the outside air, via the ventilation valve, to the container. 8. A dispenser according to claim 1, wherein the outlet channel passes through the piston rod. 9. A dispenser according to claim 1, wherein the piston rod has an end section located in the operating direction with a stop step, said stop step having a stop projection engaging behind a sealing lip of the delivery piston element. 10. A dispenser for discharge of flowable media comprising: a pump having a pump cylinder, said pump cylinder having a pump inlet with an intake valve; a piston with a hollow piston rod being operable in an operating direction, said piston having: a delivery piston element having a spring element to form a spring loaded delivery piston element; and a pump outlet including a delivery valve, the delivery valve being a path-control valve, the delivery valve having a ram-shaped valve body engaging the hollow piston rod, said delivery valve being provided with a valve channel and a valve control edge, said hollow piston rod forming an associated counter-control edge, and an outlet channel; said spring element being loaded in response to movement of the piston rod in the operating direction, said media being discharged in response to the opening of the delivery valve, the discharge being effected by the action of the spring loaded delivery piston element; whereby the discharge of said media being effected after said path controlled opening of the delivery valve without the need of moving the piston rod further in the operating direction. 11. A dispenser for discharge of flowable media comprising: a pump having a pump cylinder, said pump cylinder having a pump inlet with an intake valve; a piston with a piston rod being operable in an operating direction, said piston having: a delivery piston element having a spring element to form a spring loaded delivery piston element; and a pump outlet including a delivery valve, said delivery valve being a path-control valve having a valve body, and an outlet channel; said spring element being loaded in response to movement of the piston rod in the operating direction, said media being discharged in response to the opening of the delivery valve, the discharge being effected by the action of the spring loaded delivery piston element; whereby the discharge of said media being effected after said path controlled opening of the delivery valve without the need of moving the piston rod further in the operating direction; said dispenser further including: a casing portion; a return spring and a cage; the casing portion receiving the valve body, the diameter of said casing portion being smaller than the diameter of the pump cylinder, the return spring surrounding the valve body, and further having a cage containing the intake valve and having a base section, the base section being surrounded by the return spring. 12. A dispenser for discharge of flowable media comprising: a pump having a pump cylinder, said pump cylinder having an intake valve; a piston with a piston rod being operable in an operating direction, said piston having: a delivery piston element having a spring element to form a spring loaded delivery piston element; and a pump outlet including a delivery valve, said delivery valve being a path-control valve, and an outlet channel, said spring element being loaded in response to movement of the piston rod in the operating direction, said media being discharged in response to the opening of the delivery valve, the discharge being effected by the action of the spring loaded delivery piston element, whereby the discharge of said media being effected after said path controlled opening of the delivery valve without the need of moving the piston rod further in the operating direction; wherein the delivery piston element is an annular piston collar sealingly guided on the piston rod and in the pump cylinder, said dispenser further including a return spring element for loading the piston counter to the operating direction; and the piston rod has a ventilation valve for a medium-containing container, said ventilation valve having a sealing surface for cooperating with an opening of a casing surface of the pump cylinder for providing a connection for the outside air, via the ventilation valve, to the container.