Pump dispenser with threshold actuation and restoring spring

Device (G) for dispensing liquids (1), especially medicinal liquids from a mouthpiece aperture (2), the device comprising a piston-cylinder device operative as a pump, and threshold means;

• wherein the mouthpiece aperture is connected to a supply of liquid, by manual actuation of the piston-cylinder device (4) which allows the manual actuation only after an overload threshold has been exceeded, there being a restoring spring force assigned to the overload threshold;
• and
• the piston-cylinder device defines a pump chamber, and said spring force is provided by a spring disposed outside the pump chamber for returning a pump piston of the piston-cylinder device to its position relative to a pump cylinder of the piston-cylinder device upon completion of the manual actuation;
• and
• said threshold means operatively interconnects between said piston and said cylinder to establish said overload threshold;
• the device further comprises a liquid reservoir with a riser, and an insert (11) on a rear side of the mouthpiece aperture, the rear side being upstream of the mouthpiece aperture with respect to a direction of flow of liquid through the aperture;
• and channels (47) located on a top side of the mouthpiece aperture and extending transversely of a direction of fluid flow, the top side being downstream of the mouthpiece aperture;
• the pump piston (6), which is connected by means of the riser (26) to the liquid reservoir (18) and is configured as an intake passage (22), is configured as a component which is fixed relative to the liquid reservoir (18), the pump cylinder (5), which is spring-loaded in the restoring direction, has at its free end the mouthpiece aperture (2), on the rear side of which is located the insert (11) for deflecting a jet of liquid several times by means of the transverse channels;
• and
• the insert (11) comprises a foot plate (55) which forms a valve body.

Device (G) for dispensing liquids (1), especially medicinal liquids, from a mouthpiece aperture (2), the device comprising a piston-cylinder device operative as a pump, and threshold means;

• wherein the mouthpiece aperture is connected to a supply of liquid, by manual actuation of the piston-cylinder device (4) which allows the manual actuation only after an overload threshold has been exceeded, there being a restoring spring force assigned to the overload threshold;
• and
• the piston-cylinder device defines a pump chamber, and said spring force is provided by a spring disposed outside the pump chamber for returning a pump piston of the piston-cylinder device to its position relative to a pump cylinder of the piston-cylinder device upon completion of the manual actuation;
• and
• said threshold means operatively interconnects between said piston and said cylinder to establish said overload threshold;
• the device further comprises a liquid reservoir with a riser, and an insert (11) on a rear side of the mouthpiece aperture, the rear side being upstream of the mouthpiece aperture with respect to a direction of flow of liquid through the aperture;
• and channels (47) located on a top side of the mouthpiece aperture and extending transversely of a direction of fluid flow, the top side being downstream of the mouthpiece aperture;
• the pump piston (6), which is connected by means of the riser (26) to the liquid reservoir (18) and is configured as an intake passage (22), is configured as a component which is fixed relative to the liquid reservoir (18), the pump cylinder (5), which is spring-loaded in the restoring direction, has at its free end the mouthpiece aperture (2), on the rear side of which is located the insert (11) for deflecting a jet of liquid several times by means of the transverse channels;
• the device further comprises an actuating device, and a pressure balance path (35) located between the liquid reservoir (18) and the actuating device of the device (G);
• and
• a second piston (62) mounted to a shaft of the pump piston (6) for movement therewith, and a cylinder-side annular space (64) serving as a second chamber for receiving the second piston;
• wherein the second piston (62), via a rear surface thereof and the cylinder-side annular space (64), connects to the pressure balance path (35), by way of a shaft (36) and a radial passage (37), a top surface of the second piston being manually displaced into the region of an air-passage opening (67) leading to the interior of a cap of the dispensing device.

A delivery device for the delivery of an atomised spray of a metered volume of liquid, in particular liquid containing medicament, comprising:

• a reservoir for holding liquid;
• and a manually-actuated pump assembly comprising first and second body parts one of which includes a delivery orifice and one of a piston or a cylinder, and the other of which body parts includes the other of a piston or a cylinder, the piston being slideably disposed within the cylinder and the piston and the cylinder together defining a pump chamber for containing the metered volume of liquid to be atomized, the pump chamber having an inlet communicatable with the reservoir and an outlet communicatable with the delivery orifice;
• wherein the first and the second body parts are relatively movable between a first position in which the pump chamber has a first volume and a second position in which the pump chamber has a second volume smaller than the first volume, such that on actuation of the pump assembly in moving the first and the second body parts from the first position to the second position, the metered volume of liquid in the pump chamber is atomised through the delivery orifice;
• and wherein the first and the second body parts include inter-engaging elements which provide a mechanical resistance of a predetermined threshold to actuation of the pump assembly, and a return spring is disposed outside the pump chamber for returning the first and the second body parts to the first position.