JPS6310305B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manual dispenser that sucks up liquid into a cylinder by sliding a piston and discharges it under pressure.

Generally, in this type of dispenser, by sucking up liquid into the cylinder, the liquid level of the container to which the dispenser is attached falls. The drop in the liquid level creates a negative pressure inside the container, and if left as it is, the negative pressure will make it impossible to suck up the liquid. For this reason, manual dispensers have been provided that introduce air from the atmosphere into the container in response to the pushing stroke of the piston, thereby preventing negative pressure. For example, according to Japanese Patent Publication No. 53-4921, an actuating rod is moved together with the piston, and when the piston is pushed in, the actuating rod presses against the packing to open the vent hole. Also, Jikko 52-
In No. 11686, a ventilation cylinder and a ventilation piston are provided to prevent negative pressure, and when the ventilation piston is pushed in, the atmosphere flows into the container through the ventilation cylinder. However, such a configuration is complicated and difficult to mold, and has the disadvantage that the actuating rod and the ventilation piston are exposed, which is aesthetically undesirable. In addition to the first flared skirt-shaped seal piece formed on the inner end of the piston, a second flared skirt-shaped seal piece is provided on the piston to prevent negative pressure, and a negative pressure is applied to the cylinder wall. Dispensers provided with prevention holes are known.
Here, the second seal piece expands in the same direction as the first seal piece to ensure a sealed state with the inner wall of the piston. However, by pushing the piston, the second seal piece moves above the negative pressure prevention hole and releases the seal, allowing air from the atmosphere to flow into the container through the negative pressure prevention hole. There is. This configuration is simple and aesthetically pleasing.

However, in known arrangements, when the piston is in the depressed position, the interior of the container is in communication with the atmosphere.
Therefore, if the container tilts or falls when the piston is pushed in, there is a risk that the liquid inside the container will leak into the atmosphere. Furthermore, even if it does not leak, the odor of the liquid will be diffused into the atmosphere. Conventional dispensers do not take this into consideration, and do not provide anything that prevents negative pressure from forming while preventing communication between the inside of the container and the atmosphere.

This invention was made in view of this point, and aims to provide a manual dispenser that prevents negative pressure from building up even though the inside of the container is isolated from the atmosphere.

To achieve this objective, according to the invention:
The piston further includes a third flared skirt-shaped sealing piece that expands in the opposite direction to the second flared skirt-shaped sealing piece, and an air trapping space is defined between the second and third sealing pieces and the inner wall of the cylinder. stipulated. The air trapping space communicates with the atmosphere at the protruding position of the piston by releasing the sealing state of the third seal piece. Further, the sealing state of the second seal piece is released, and when the piston is in the pushed position, the air trapping space communicates with the inside of the container via the negative pressure prevention hole.
In such a configuration, when the piston is in the extended position, air enters the air-trapping space and is trapped there between the extended and pushed-in positions (intermediate position), and when the piston moves to the pushed-in position, negative pressure It flows into the container through the prevention hole. In this way, negative pressure inside the container is prevented. Further, when the piston is in the protruding position, the second seal piece contacts the inner wall of the cylinder, and when the piston is in the pushed-in position, the third seal piece contacts the inner wall of the cylinder to maintain a sealed state. Therefore, no matter what position the piston is in, the liquid in the container cannot flow out through the space between the second and third seal pieces and the inner wall of the cylinder, and leakage can be completely prevented.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in Figure 1, manual dispenser 1
0 includes a cylinder 12, a piston 14 slidably housed within the cylinder, and a head 16 attached to the outer end of the piston. The outer end 18 of the cylinder 12 is open and a liquid inlet hole 22 is formed at the inner end 20. And at least one
For example, four negative pressure prevention holes 24 are formed in the cylinder wall. In addition, in the embodiment, the cylinder 12
Although it is arranged upright, it goes without saying that it may be arranged horizontally or inclined. primary valve 26,
For example, a ball valve is disposed at the inner end of the cylinder 20 to open and close the liquid inlet hole 22 . Further, a suction pipe 30 for guiding the liquid in the container 28 to the liquid inflow hole 22 is fitted into an extension of the inner end 20 of the cylinder.

As can be seen in FIG. 1, the piston 14 is disposed within the cylinder 12 via the outer end 18 of the cylinder and has a hollow cylindrical shape with an axial liquid outlet passage 32 therein. When the piston 14 is in the pushed-in position (lowered position in the embodiment), a valve holder 34 that presses the primary valve 26 against the valve seat extends in the axial direction at the center of the piston. A secondary valve 38, for example a ball valve, which opens and closes the liquid outflow path 32 and defines a pressurized chamber 36 between it and the primary valve 26 is disposed within the liquid outflow path 32 of the piston. Furthermore, piston 1
4 are flared skirt-shaped seal pieces 4 in the order of first, second, and third in the direction away from the primary valve 26.
1, 42, and 43 are integrally provided on the outer wall. Among these seal pieces, the first and second seal pieces 4
1 and 42 are expanded in the direction of the primary valve, and the third seal piece is expanded in the opposite direction, that is, in the direction away from the primary valve. A compression coil spring 44 is disposed between the first seal piece 41 and the inner end 20 of the cylinder, and the piston 14 is moved in the projecting direction (upward in the embodiment).
biased toward Also, the second and third seal pieces 4
2, 43 is an air trapping space 4 between the inner wall of the cylinder
6. This air trapping space 46 communicates with the atmosphere when the piston 14 is in the protruding position (raised position) shown in FIG. 1 by releasing the sealing state of the third seal piece 43. On the other hand,
By releasing the sealing state of the second seal piece 42, when the piston 14 is in the pushed-in position, that is, the lowered position (see FIG. 3),
communicates with the inside of the container via the negative pressure prevention hole 24. Between these positions (intermediate positions), the air trapping space 46 is sealed, as shown in FIG.

Since the air trapping space 46 is formed as described above, when the piston 14 is pressed down from the raised position, the piston slides within the cylinder 12 with air being sealed in the air trapping space. Then, when the piston is pushed down to the lowered position, the air in the air trapping space 46 flows into the container through the negative pressure prevention hole 24. By allowing air to flow in this way, negative pressure inside the container is prevented. It goes without saying that the air trapping space 46 is formed in a size that can contain an amount of air sufficient to prevent negative pressure, that is, an amount of air corresponding to at least one stroke of liquid outflow. In such a configuration, not only the intermediate position shown in FIG. 2 but also the lowered position shown in FIG. 3,
Even in the raised position shown in FIG. 1, at least one of the seal pieces 42 and 43 maintains a sealed state. In other words, the inside of the container does not communicate with the atmosphere.
Therefore, even if the dispenser 10 is tilted or knocked down together with the container 28, the liquid will not leak out and its odor will not be diffused.

Note that the configuration for releasing the sealed state of the seal pieces 42 and 43 is not limited to the one shown in the drawings, and may be other configurations, such as a configuration in which a protrusion is provided on the inner wall of the cylinder and the seal piece is partially deformed by the protrusion. good. Furthermore, the pushed-in position of the piston 14 (in the embodiment, the lowered position) cannot be specified because the piston is not always pushed to a certain position. Furthermore, the air in the air entrapment space 46 is absorbed into the container 28 by the time the piston 14 reaches the pushed-in position and begins to eject.
It is sufficient that the piston flows into the interior of the piston, and the piston may flow before the piston reaches the push-in position. In other words, the sealing state of the seal piece 42 may be released before the piston is pushed into the position. Therefore, the negative pressure prevention hole 24
is formed to have a certain size in the axial direction of the piston. On the other hand, although the protruding position of the piston 14 is determined by a stopper, which will be described later, it is easy to see that the sealing state of the third seal piece 43 is released as long as it is near the protruding position of the piston. be understood. Therefore, in this specification, the pushed-in position and extended position of the piston in relation to the function of the air trapping space are used as concepts that include not only the most pushed-in position and the most extended position of the piston, but also positions in the vicinity thereof. .

As shown in FIG. 1, cylinder 12 is attached to container 28 by attachment means 48, such as a screw cap. A stopper 50 for preventing the attachment means 48 from falling off is attached to the cylinder 12. This stopper 50 determines the protruding position (raised position) of the piston 14 by abutting the stepped portion 52 of the piston on the lower surface of its base. Also, in at least one embodiment, four communicating holes 54 and four engaging protrusions 56 are formed in the base and inner wall of the stopper, respectively.

A channel 58 communicating with the liquid outlet channel 32 of the piston
As can be seen from FIG.
It is fitted into the piston 14. An engagement protrusion 60 corresponding to the engagement protrusion 56 of the stopper is formed on the outer wall of the head. Engagement protrusions 56, 60
After pushing the head 16 and lowering the piston 14 to the lowered position, by rotating the head, the upper surface of the engagement protrusion 60 comes into contact with the lower surface of the engagement protrusion 56, and the head and piston are moved to the depressed position. can be locked to In addition, the number, shape, and
The position is determined appropriately, and what is important is that a predetermined lock is obtained. By locking the head and piston in the pushed-in position during transportation before use or when not in use, the dispenser 10
can be made more compact by lowering its overall height. Note that reference numeral 62 indicates packing.

As described above, according to the manual dispenser according to the present invention, an air trapping space is defined between the second and third flared skirt-shaped seal pieces of the piston and the inner wall of the cylinder. This air trapping space can communicate with the atmosphere at the protruding position of the piston by releasing the sealing state of the third seal piece. Further, the air trapping space can communicate with the interior of the container through the negative pressure prevention hole of the cylinder when the second seal piece is released from the sealed state and the piston is pushed in. With such a configuration, air at least corresponding to the amount of liquid flowing out can be caused to flow into the container for each stroke, and negative pressure inside the container can be prevented. Furthermore, both the second and third seal pieces maintain a sealed state at the intermediate position, and either one maintains the sealed state at the protruding position or the pushed-in position. Therefore, leakage of liquid in the container and diffusion of odors can be prevented.

In addition, the dispenser can be equipped with a spinner at the tip of the flow path and, if necessary, a foaming means.
Needless to say, it can also be used as a sprayer or foamer. The dispenser may also be configured such that the cylinder is arranged horizontally and the piston cooperates with the trigger.

The above embodiments are for illustrating this invention, and are not intended to limit this invention in any way, and any modifications, modifications, etc. Needless to say, it is included in

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a manual dispenser according to the present invention, and FIGS. 2 and 3 are partial vertical cross-sections of the manual dispenser showing the state of the captured space at the intermediate position and the pushed-in position of the piston, respectively. be. 10...Manual dispenser, 12...Cylinder, 14...Piston, 16...Head, 24
... Negative pressure prevention hole, 26 ... Primary valve, 38 ... Secondary valve, 41, 42, 43 ... Flare skirt-shaped seal piece, 46 ... Air trapping space.

Claims (1)

[Claims] 1. A cylinder that has an open end, the other end with a liquid inflow hole formed therein, and a negative pressure prevention hole formed in the wall, and is attached to a container by an appropriate attachment means, and a primary valve that opens and closes the liquid inflow hole of the cylinder. The outer wall is provided with flared skirt-shaped seal pieces in the order of first, second, and third in the direction away from the primary valve, and an axial liquid outflow passage is provided inside, and the cylinder is connected to the cylinder through the open end of the cylinder. A piston that is slidably received in the piston, a head that is attached to the outer end of the piston and has a flow path that communicates with the liquid outflow path of the piston, and a primary valve that opens and closes the liquid outflow path of the piston. a secondary valve that defines a pressurizing chamber, and the first and second seal pieces of the piston are arranged in the direction of the primary valve, and
The seal pieces expand in the opposite direction to define an air trapping space between the second and third seal pieces and the cylinder inner wall, and the sealing state of the third seal piece is released and the piston is at the protruding position. A manual dispenser in which an air trapping space can be communicated with the atmosphere through a negative pressure prevention hole in a pushed-in position when the sealing state of a second seal piece is released.