Dispensing – With discharge assistant – With movable nozzle interconnected therewith
Reexamination Certificate
2003-03-03
2004-11-16
Derakshani, Philippe (Department: 3754)
Dispensing
With discharge assistant
With movable nozzle interconnected therewith
Reexamination Certificate
active
06817491
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a discharge container which receives a liquid such as a drug solution or the like, and discharges the liquid on the basis of a pump operation.
BACKGROUND ART
A pump portion
41
used for a conventional discharge container for discharging a liquid such as a drug solution or the like is provided, as shown in
FIG. 10A
, with a cylinder
42
filled with a drug solution
2
, a piston provided within the cylinder
42
so as to freely oscillate and urged upward by a spring
43
, and an outflow valve
45
formed by a flexible member, brought into contact with an outer peripheral portion of the piston
44
and oscillating within the cylinder
42
together with the piston
44
. Further, the cylinder
42
is provided in a bottom portion with an inflow port
46
flowing the liquid into the cylinder
42
from a container (not shown) receiving the liquid, and a check ball
47
corresponding to an inflow valve passing the liquid flowed within the cylinder
42
and shutting the liquid supplied from the above. In the discharge container having the pump portion
41
in, accordance with the conventional art, when a user presses down the piston
44
, the piston
44
and the outflow valve
45
are integrally pressed downward as shown in
FIG. 10B
, whereby a pressure is applied to the liquid within the cylinder
42
. Since the check ball
47
provided in the bottom portion of the cylinder
42
shuts the liquid from the supplied from the above, the pressure is applied to the liquid within the cylinder
42
. As mentioned above, when the pressure is applied to the liquid within the cylinder
42
, the outflow valve
45
in an outer peripheral portion of the piston
44
is bent, whereby the liquid is flowed out upward from a gap between the outflow valve
45
and the piston
44
.
Further, when the user takes off a hand from the piston
44
, the piston
44
is pressed upward by the spring
43
. At this time, the piston
44
and the outflow valve
45
are brought into contact with each other, whereby the outflow valve
45
is closed, so that the drug solution is sucked from the inflow port
46
via the check ball
47
so as to be charged within the cylinder
42
.
In the conventional discharge container mentioned above, a state that the liquid is discharged is changed in correspondence to a speed at which the user presses the piston
44
. For example, when the speed at which the piston
44
is pressed is high, the liquid is energetically discharged, however, when the speed at which the piston
44
is pressed is low, the liquid is discharged only little by little. Accordingly, for example, in the case that the discharge container is used as a spray for atomizing the drug solution in a vapor form, the drug solution is discharged in a vapor form if the speed at which the piston
44
is pressed is high, however, the drug solution is discharged in a liquid ball form not in a vapor form if the speed at which the piston
44
is pressed is low. In the case that the discharge container is used as the spray for applying the drug solution as mentioned above, since a diameter of an applied drop of the drug solution is changed in correspondence to a pressing way of the piston
44
, there is a risk that a result of effect due to the drug application is changed.
Further, in the conventional discharge container mentioned above, since generally the discharge port for discharging the liquid and the piston
44
are integrally formed, the discharge port is pressed down when the piston
44
is pressed down. Accordingly, in the conventional discharge container, when discharging the liquid, the discharge port discharges the solution while moving down. Accordingly, even in the case that it is necessary for the user to discharge the liquid to an accurate position, the discharge port moves, so that it is hard to discharge to the accurate position.
An object of the present invention is to improve a discharge container, and further in order to solve the problem mentioned above, a detail object is to provide a discharge container which can discharge a liquid such as a drug solution or the like in a stable state.
DISCLOSURE OF THE INVENTION
In order to achieve the object mentioned above, in accordance with a first aspect of the present invention, there is provided a discharge container for discharging a liquid received within a container to an external portion on the basis of a pump operation, having the following features. At first, the discharge container is provided with a cylinder within which a liquid is charged, a first piston slidably provided within the cylinder and urged in a backward moving direction by a first spring, a second piston slidably provided within the cylinder and backward moving while compressing a second spring when the liquid within the cylinder is pressed by the first piston, an inflow port for flowing the liquid from the inner portion of the container to an inner portion of the cylinder, an inflow valve provided between the inflow port and the container, passing the liquid flowing into the cylinder and shutting an outflow of the liquid from the inner portion of the cylinder, an outflow port for flowing the liquid to the external portion from the inner portion of the cylinder, and a liquid passage connecting the outflow port to the discharge port.
Further, the cylinder has a small diameter portion having a small inner diameter, a large diameter portion having a large inner diameter and a step portion corresponding to a boundary therebetween, the first piston is provided within the small diameter portion, the second piston is provided within the large diameter portion so as to oppose to the first piston, the outflow port is formed near a front end portion of the first piston so as to direct to a sliding surface with the cylinder, the liquid passage is connected to the discharge port through the first piston, the inflow port is provided so as to pass through the second piston, the first piston is urged in a direction moving apart from the second piston by the first spring, the second piston is urged by the second spring so as to be brought into contact with the step portion.
Further, while the first piston moves at a predetermined stroke, the outflow port is closed, and the second piston moves backward while pressing and compressing the second spring by the liquid existing between the first piston and the second piston.
On the other hand, when the first piston moves over the predetermined stroke, the outflow port is opened, the second piston is pressed back to the second spring and the liquid within the cylinder is discharged to the external portion via the outflow port, the liquid passage and the discharge port due to an urging force of the second spring.
In the discharge container in accordance with the first aspect of the present invention, in the case that the first piston is pressed by the user, since the outflow port is closed until the predetermined stroke, the pressure is applied to the liquid received between the first piston and the second piston, the second spring is compressed and the second piston moves backward. Further, when the first piston is pressed over the predetermined stroke, the outflow port is opened, so that the liquid to which the pressure is applied from the second spring flows out from the outflow port, and the liquid is discharged to the external portion via the liquid passage and the discharge port.
As mentioned above, in the discharge container in accordance with the first aspect of the present invention, the liquid within the cylinder is urged by the second spring so as to be discharged. Therefore, in accordance with the discharge container of the present invention, since the pressure applied to the liquid at a time of discharging the liquid becomes uniform, it is possible to always discharge in a stable state. Accordingly, even in the case that the discharge container in accordance with the present invention is used in the spray for spraying the drug solution, since the state of the sprayed drug solution is stable, a diameter of
Derakshani Philippe
Kabushiki Kaisha Top
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