JP4518238B2 - Liquid ejector - Google Patents

Description

  The present invention relates to a manual pump type liquid ejector that is used by being fixed to a mouth tube portion of a container.

  For example, Patent Document 1 shows an example of a manual pump type liquid discharger. The liquid ejector is used as a sprayer, bubble ejector, or liquid ejector that ejects liquid as it is by changing the structure of the nozzle, etc., but these basic structures are fitted to the mouth tube part of the container With the top wall of the mounted cylindrical body, the outward flange at the upper end of the cylinder hanging down in the container is sandwiched between the upper end surface of the mouth tube portion of the container, and the piston standing up from the cylinder A pressing head with a nozzle is fixed to the upper end, and with the piston and the pressing head biased upward by a spring, the piston is moved up and down with respect to the cylinder so that the liquid in the cylinder (inside the container) is discharged from the nozzle. It is made to discharge.

  Therefore, in the push-down operation of the piston, the compression of the spring in the cylinder that urges the piston upward, and the discharge of the liquid in the cylinder by the compression of the volume in the cylinder chamber are performed simultaneously. In the pressing operation of the head, a force is applied to the fingertip and the finger may become painful.

As a means for eliminating the above-mentioned drawbacks, Patent Document 2 describes a method of fixing a rubber plate having a thickness width that can be elastically compressed to the top surface of a pressing head.
JP-A-55-124564 Utility Model Registration No.25211139

  However, in Patent Document 2, as a method of fixing the rubber plate to the top surface, a means such as providing a short cylinder on the top surface and fitting the rubber plate or bonding the rubber plate to the top surface is described. However, there is a risk of the rubber plate slipping or falling off during use, and the rubber plate covers the entire top wall of the pressing head, so the appearance may be impaired. There is also a problem that a production cost is increased due to a process of attaching or bonding to the surface.

The present invention is intended to solve the above-described problems. A soft material such as a rubber plate, which is softer than the pressing head, is fixed to the top wall so as not to shift or drop off with high productivity. Therefore, an object is to provide a liquid ejector having excellent operability and appearance.

The present invention has been made to achieve the above object, and among the means for solving the problems of the present invention, the means of the first invention is:
A mounting cylinder that fits into the mouth tube portion of the container, a cylinder that is fixed inside the container by the mounting cylinder, a piston that is slidably fitted in the cylinder in the vertical direction, and an upper end portion of the piston In a liquid discharger having a topped cylindrical pressing head to be assembled, and a spring that biases the piston and the pressing head upward,
A soft plate piece made of a soft material softer than the pressing head is fixed to the upper surface of the top wall of the pressing head by insert molding.
A short cylinder piece is erected on the outer peripheral edge of the top wall of the pressing head, and the side wall of the soft plate piece is covered with the cylinder wall of the short cylinder piece.
It is in.

With the above configuration of the first invention , when a finger is placed on the soft plate piece fixed to the top wall and the pressing head is pressed down, the piston moves down against the elasticity of the spring, and the liquid in the cylinder passes through the nozzle. However, since it is a pressing operation by placing a finger on a soft plate piece made of a soft material, the soft touch prevents the pressing finger from becoming painful and makes the pressing operation smooth. be able to.

Also, since the soft plate piece is insert-molded on the top surface of the top wall, when the pressing head is injection-molded, the injected molten resin is pressed against the periphery of the soft plate piece, that is, the back surface and the side periphery. Since it is filled and cooled and solidified in a pressure-holding state, the soft plate piece can be securely fixed without requiring a separate process for fixing and without being displaced or dropped. Further, by configuring the short cylindrical piece so as to cover the side periphery of the soft plate piece, the soft plate piece can be completely fitted into the top wall, and the pressing head can The appearance can be experienced and a liquid ejector that is more excellent in appearance can be provided.

According to a second aspect of the present invention , in the first aspect of the invention, the soft plate piece is fixed in an undercut shape by insert molding.

With the above configuration of the second invention , the soft plate piece can be easily fixed in an undercut shape to the top surface of the top wall of the pressing head by insert molding, and the soft plate piece can be fixed more firmly. Can do.

Means of the third invention, the first invention, Oite the second inventions, it is opened above the center portion of the top wall of the depression head is in.

With the above configuration of the third aspect of the invention, the central portion of the top wall is opened, so that there is no support from below by the top wall at the opening, so the soft plate piece is more easily deformed when pressed, The soft feeling when pressing can be further strengthened, and an unprecedented comfortable operation feeling can be given.

Since the present invention has the above-described method and configuration, the following effects can be obtained.
In the first invention, since the pressing operation is performed by placing a finger on a soft plate piece made of a soft material, the soft touch prevents the pressing finger from becoming painful and smoothly presses down. Since the soft plate piece is insert-molded on the upper surface of the top wall, the injected molten resin is injected into the periphery of the soft plate piece, that is, the back surface and the back surface. Filling in the pressed state to the side periphery and further cooling and solidifying in the pressure-holding state, it is possible to securely fix the soft plate piece in a state without displacement or dropping without requiring a separate process for fixing. Further, by configuring the cylindrical wall of the short cylindrical piece standing on the outer peripheral edge of the top wall so as to cover the side periphery of the flexible plate piece, it is possible to make the soft plate piece fit into the top wall. Thus, the pressing head can have an external appearance with a sense of unity, and a liquid ejector that is superior in appearance can be provided.

In the second invention , the soft plate piece can be easily fixed in an undercut shape to the upper surface of the top wall of the pressing head by insert molding, and the soft plate piece should be fixed more firmly. Can do.

In the third invention, the soft plate piece is more easily deformed at the time of pressing, the soft feeling at the time of pressing with the finger can be further strengthened, and an unprecedented comfortable feeling of operation can be given.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 and FIG. 2 show an embodiment of the liquid ejector of the present invention, FIG. 1 is a half longitudinal sectional view, and FIG. 2 is a perspective view in a state of being fitted to a container.

  The main constituent members of the liquid ejector of the present embodiment are the fitting cylinder 12, the cylinder 21, the second cylinder 22, the stem 28, the pusher, and the fitting cylinder 12 a screwed into the mouth tube portion 11 a of the container 11. The lowering head 1.

  The fitting cylinder 12 has a top-like cylindrical fitting cylinder 12a having a top wall opened at the center, an outer cylinder piece 12b and an inner cylinder piece 12c erected coaxially from the top wall, The cylinder 21 is fixed in a state in which the flange 21 a at the upper end portion is sandwiched between the upper end surface of the mouth tube portion 11 a of the container 11 and the top wall of the fitting cylinder body 12 via the packing 13 and is placed in the container 11. Is retained. A cylindrical stem 28 is installed coaxially in the cylinder 21.

In this embodiment, a second cylinder 22 as a second cylinder is arranged at the upper end portion of the piston 23. The second cylinder 22 has a top-cylindrical shape and is vertically arranged on the inner cylinder piece 12c of the mounting cylinder 12. It is inserted so as to be slidable in the direction, and has a fitting cylinder 22a for fixing with a pressing head 1 to be described later and a fitting set on the top wall.

  In this embodiment, the piston 23 includes an inner member 23a and an outer member 23b, and the upper end portion is inserted into the second cylinder 22 and the lower portion is inserted into the cylinder 21 so as to be slidable in the vertical direction. The piston 23 is in an upwardly biased state by a coiled spring 26 that abuts the lower end surface. The spring 26 is held in a standing posture by a stem 28.

  The pressing head 1 is composed of a cylindrical body 2 with a top, has a nozzle 5 on the upper side wall, a hanging cylinder piece 3 is suspended from the lower surface of the top wall 4, and the above-described second cylinder 22 is assembled. Fixed. Further, the top surface of the top wall 4 has a gently concave shape so that the index finger can be easily applied, and a short cylindrical piece 4a is formed on the outer peripheral edge of the top wall 4 so that the soft plate piece 6 is just fitted into the top wall 4. It is fixed in a state, and the appearance is also excellent.

As a material for forming the soft plate piece 6 of the present invention, natural rubber, a soft synthetic resin, or the like is used. However, the shape needs to be maintained when insert molding is performed in injection molding. That is, since the press-down head 1 is usually manufactured by injection molding a general-purpose resin such as polypropylene, the shape needs to be maintained at the resin temperature of injection molding of these resins (temperature of about 200 to 280 ° C.). Yes, the shape needs to be formed in a three-dimensionally crosslinked state. Further, even a hard synthetic resin can be used by foaming or the like to make it porous.

  The function of the manual pump is demonstrated by the action of the above-described members such as the cylinder 21, the second cylinder 22, the piston 23, the spring 26, and the valve plug 24, the ball valve 25, the through hole 29, etc. shown in FIG. When a finger is placed on the soft plate piece 6 fixed to the wall 4 and the push-down head 1 is pushed down, the piston 23 descends via the second cylinder 22 against the elasticity of the spring 26, and the cylinder 21 and the first 2 The hollow portion (pressurized space) 27 in the cylinder 22 is compressed, and the liquid in the cylinder 21 and the second cylinder 22 is discharged through the nozzle 5, but the finger is applied to the soft plate piece 6 made of a soft material. Therefore, the soft touch can prevent the finger being pressed from becoming painful and can be a smooth pressing operation.

  The soft plate piece 6 is insert-molded on the top surface of the top wall, and when the pressing head 1 is injection-molded, the injected molten resin is caused by the back surface of the soft plate piece 6 and the short cylinder piece 4a. Since the entire surface of the side periphery is filled in a pressed state and further cooled and solidified in a pressure-holding state, it is possible to eliminate displacement or dropout during use.

  FIG. 3 is a longitudinal sectional view showing another example of the push-down head 1. The soft plate piece 6 is formed in an undercut shape by insert molding as a shape in which the enlarged diameter portion 8 is formed in the lower portion of the soft plate piece 6. This is an example of fixing to the wall 4, and the soft plate piece 6 can be more reliably prevented from shifting or falling off.

  FIG. 4 is a longitudinal sectional view showing still another example of the pressing head 1, which has an opening at the center of the top wall 4, and the soft plate 6 is supported from below by the top wall 4 in this opening. The feature is that it is not configured. Moreover, it is set as the structure which attached to the soft board piece 6 the knob 7 used in the attachment process to the metal mold | die surface at the time of insert molding.

  By adopting such a configuration, the soft plate piece 6 is more easily deformed when pressed, the soft feeling when pressed with a finger can be further strengthened, and an unprecedented comfortable operational feeling can be imparted. .

  The configuration related to the manual pump portion such as the cylinder and piston described in the present embodiment is for ejecting the content liquid particularly in the form of a spray, but this is a type of pushing down the push-down head with a finger. This is merely an example of a manual pump, and the effect of the soft plate piece of the present invention is generally exhibited in a liquid ejector having a manual pump of a type in which the push-down head is pushed down with a finger. The configuration relating to these manual pump portions is not limited to the present embodiment.

  The soft material can be securely fixed to the nose wall of the pressing head part at low cost without slipping or falling off, and it can be used in a wide range of applications such as cosmetics with a manual pump having a pressing head. .

It is a half vertical side view which shows one Example of the liquid discharger of this invention. It is a perspective view which shows the part of the pressing head of the liquid ejector shown in FIG. It is a vertical side view which shows the other example of the pressing head in FIG. It is a vertical side view which shows the further another example of the pressing head in FIG.

DESCRIPTION OF SYMBOLS 1; Pushdown head 2; Cylinder body 3; Dripping cylinder piece 4; Top wall 4a; Short cylinder piece 5; Nozzle 6; Soft plate piece 7; Mounting cylinder 12a; Mounting cylinder 12b; Outer cylinder piece 12c; Inner cylinder piece 13; Packing 21; Cylinder 21a; Flange 22; Second cylinder 22a; Stopper 25; ball valve 26; spring 27; hollow part (pressure space)
28; stem 29; through hole

Claims (3)

A mounting cylinder (12) fitted to the mouth tube (11a) of the container (11), a cylinder (21) fixed in the container (11) by the mounting cylinder (12), and the cylinder (21 ), A piston (23) that is slidably inserted in the vertical direction, a top-down cylindrical pressing head (1) that is assembled to the upper end of the piston (23), and the piston (23). In a liquid ejector having a spring (26) for urging the pressing head (1) upward, a short cylindrical piece (4a) is erected on the outer peripheral edge of the top wall (4) of the pressing head (1). The upper surface of the top wall (4) of the pressing head (1) and the inner peripheral surface of the cylindrical wall of the short cylinder piece (4a) are made of soft material softer than the pressing head (1). A liquid discharger characterized in that the plate piece (6) is fixed by insert molding.   The liquid ejector according to claim 1, wherein the soft plate piece (6) is fixed in an undercut shape by insert molding. 3. The liquid ejector according to claim 1, wherein a central portion of the top wall (4) of the pressing head (1) is opened.

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