JPH0547113Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Industrial Application Field This invention relates to a container for dispensing low viscosity liquids. 2. Description of the Related Art A container shown in FIG. 4 is known as an example of this type of container. Figure 4 is an enlarged sectional view of the area around the mouth of the container, with the left half showing the state in use with the piston at its upper limit of movement, and the right half showing the state when not in use with the piston at its lower limit of movement. ing. In the figure, reference numeral 1 denotes a container, and a cylinder 5 with an open upper end is attached to the mouth portion 2 of the container 1 through a gasket 3 so as to hang down into the container 1 . A piston 7 is housed in a piston chamber 6 within the cylinder 5 so as to be movable up and down. A hollow piston rod 8 extending upward is disposed on the piston 7, and a nozzle member 10 in which a nozzle (not shown) is formed is fitted at the tip thereof. A male thread 11 is provided on the outer periphery of the lower part of the nozzle member 10, and this male thread 11 is screwed into a female thread 13 provided on the inner peripheral wall of a cap 12 that covers the upper end opening of the cylinder 5 and is attached to the mouth portion 2. . The nozzle member 10 is screwed together with the male thread 11 and the female thread 13.
The cap 12 is locked, and the piston 7 is brought into contact with the seal member 15 erected on the bottom surface of the cylinder 5, at its lower limit of movement. On the other hand, a spring 16 is interposed between the piston 7 and the bottom surface of the cylinder 5 to urge the piston 7 upward, and when the nozzle member 10 and the cap 12 are unlocked, the piston 7 is moved upward. The leg 17 of the piston rod 8 is at its upper limit of movement, in contact with the lower end of the inner circumferential wall of the cap 12. A small gap 18 is formed between the inner peripheral wall of the cap 12 and the outer peripheral wall of the piston rod 8. Also,
A vent hole 20 is bored in the side wall of the cylinder 5 to communicate the inside of the piston chamber 6 and the inside of the container 1, and to introduce outside air into the container 1 through the small gap 18 through the inside of the piston chamber 6 during use. Reference numeral 21 denotes a check valve made of a ball disposed at the bottom opening of the cylinder 5; 22 is a liquid passage pipe provided below the check valve 21 and connected to the bottom opening; the tip thereof is connected to the bottom of the container 1; has reached. 23 is a check valve made of a ball disposed in the upper opening of the piston rod 8, and 25 is a spring that always biases the check valve 23 in the closing direction. In the case of the container 1 as described above, when the nozzle member 10 is pressed down in the left half state where the piston 7 is at the upper limit of movement during use, the piston 7 moves downward against the spring 16, and the piston 7 moves downwardly against the spring 16. Chamber 6 is compressed. Due to this compression, the liquid in the piston chamber 6 is discharged to the outside from the nozzle of the nozzle member 10 through the piston rod 8 and the check valve 23 which is opened. Next, when the nozzle member 10 is stopped being pressed down, the piston 7 moves upward by the force of the spring 16 and the piston chamber 6
As the piston 7 moves upward, the liquid in the container 1 is sucked into the container 1 through the liquid passage pipe 22 and the check valve 21 which is opened. By repeatedly pressing down the nozzle member 10 in this manner, it becomes possible to discharge a predetermined amount of the liquid in the container 1 to the outside. Since outside air is introduced into the container 1 through the vent hole 20 during use, the pressure inside the container 1 does not decrease (decompression). Problems to be solved by the invention By the way, in the container 1, the ventilation hole 20
Since the vent hole 20 is always open, if the container 1 is turned sideways or upside down when not in use, for example, during transportation or when the pressure inside the container 1 increases due to temperature, etc., the liquid inside the container 1 will leak into the vent hole 20. The liquid flows into the piston chamber 6 from the nozzle member 10 and the cap 12 during use.
There was a problem in that when the locking of the piston 7 was released and the piston 7 moved upward, the piston 7 spouted out from the small gap 18 between the outer circumferential wall of the piston rod 8 and the inner circumferential wall of the cap 12. Therefore, this invention solves the conventional problems as described above, and prevents the liquid in the container 1 from flowing into the piston chamber 6 even if the container 1 is turned sideways or upside down when not in use, and the small gap 18 An object of the present invention is to provide a liquid dispensing container that can eliminate accidents caused by liquid spouting from the container. Means for Solving the Problems In order to achieve the above object, this invention
As shown in FIG. 3, there are protrusions 31 oriented in the axial direction on the outer surface of the side wall of the cylinder 5, which are located on both sides of the ventilation hole 20.
32 are provided at predetermined intervals, and the line X connecting the tips of these protrusions is at a height that slightly intersects the line Y forming the outer surface of the side wall of the cylinder 5 between the two protrusions, and A cylindrical check valve 35 made of a heat-shrinkable film is installed on the outer surface of the side wall of the cylinder 5 where the stripes 31 and 32 are provided, so that the vent hole 20 is opened when outside air is introduced, and the pressure inside the container 1 is increased at times other than when outside air is introduced. It is characterized in that the ventilation hole 20 is closably covered and mounted. Function: The check valve 35 closes the container 1 when outside air is not being introduced.
The vent hole 20 is closed by the internal pressure. Therefore, even if the container 1 is turned sideways or upside down during non-use when outside air is not introduced into the container 1, for example during transportation, the liquid in the container 1 will not flow into the cylinder 5 through the vent hole 20. In addition, since the check valve 35 opens the vent hole 20 when outside air is introduced, the pressure inside the container 1 does not drop. Embodiment FIGS. 1 to 3 show an embodiment of this invention. In this embodiment, the check valve 35 attached to the outer surface of the side wall of the cylinder 5 having the protrusions 31 and 32 is made of a heat-shrinkable film (thickness: 40 μm). PET film with a folded diameter of 48 mm and an inner diameter of 30.5 mm.
mm, width 20mm) in an atmosphere of approximately 150℃ (5
~10 seconds) to form a cylindrical shape. Table 1 shows the results of an experiment on the performance of the container 1 having this check valve 35 in comparison with the container without a check valve as described above.

[Table] In this experiment, the check valve 35 was attached to the outer surface of the side wall of the cylinder 5 of the container 1 containing 400 ml of low viscosity (30 cps) liquid as shown in Figures 1 to 3, and the container 1 was placed sideways. We conducted (1) a storage test at a temperature of 40°C, (2) a vibration test, and (3) a 2000km truck transportation test. As is clear from the experimental results, in the case of the container 1 having the check valve 35, the liquid in the container 1 does not flow into the piston chamber 6. Effects of the invention This invention has the above-mentioned configuration, and the check valve can prevent the liquid in the container from flowing into the cylinder from the vent hole when the container is not in use, when outside air is not introduced into the container. Accidents of liquid spouting out from the small gap formed between the cap and the piston during use can be eliminated. In addition, since the check valve is made of heat-shrinkable film, it can be mounted extremely easily by wrapping it around the outer surface of the side wall of the cylinder, which has protrusions, and applying heat. In addition to not requiring positioning in the circumferential direction, it also has excellent effects such as lower production costs.

[Brief explanation of the drawing]

Fig. 1 is a front view of a cylinder showing an embodiment of this invention, Fig. 2 is a partial cross-sectional view taken along the - line in Fig. 1, and Fig. 3 shows a line connecting the protrusions and the outer peripheral surface of the cylinder. FIG. 4 is a schematic diagram for explaining the relationship with the formed lines, and FIG. 4 is an enlarged longitudinal sectional side view of the mouth of a conventional container. 1... Container, 2... Mouth, 5... Cylinder, 6
... Piston chamber, 7 ... Piston, 8 ... Piston rod, 10 ... Nozzle member, 11, 13 ... Screw, 16, 25 ... Spring, 18 ... Small gap, 20
...Vent hole, 35...Check valve, 31, 32...Protrusion.

Claims (1)

[Claims for Utility Model Registration] A piston with a nozzle is housed in a cylinder attached to the mouth of the container so as to be movable up and down, and when the piston moves down and is not in use, it locks with the piston. A cap is attached to the mouth portion, which locks and releases the cap from the piston to form a small gap between the piston and the piston when the cap moves up and down, and communicates between the inside of the cylinder and the inside of the container through the side wall of the cylinder, and allows outside air to flow when the cap is in use. In a liquid dispensing container having a vent hole for introducing the liquid into the container through the inside of the cylinder from the small gap, protrusions facing in the axial direction are provided at predetermined intervals on the outer surface of the side wall of the cylinder on both sides of the vent hole. , the line connecting the tips of these protrusions is at a height that slightly intersects the line forming the outer surface of the side wall of the cylinder between the two protrusions, and heat is applied to the outer surface of the side wall of the cylinder with these protrusions. A cylindrical check valve made of a shrink film is installed so as to open the vent hole when outside air is introduced, and cover the vent hole so that it can be closed by the pressure inside the container at times other than when outside air is introduced. A liquid dispensing container characterized by: