JP2559201Y2 - Liquid ejector press down head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a depression head of a pump type liquid ejector. In the present invention, the term "liquid ejector" includes not only a liquid ejecting apparatus as it is, but also an ejector ejecting atomized or foamed liquid.

[0002]

2. Description of the Related Art A cylindrical piston is fitted into a cylinder with a suction valve vertically provided in a container body, and a press-down head with a nozzle is fitted to the upper end of a stem rising from the cylindrical piston. There is known a liquid ejector provided so that the liquid in the container is sucked into the cylinder by being moved up and down and is ejected from the nozzle of the pushing head. The actuator composed of the lowering head is urged upward by a spring provided in the cylinder, so that the actuator becomes bulky in the case of the container packaging with the ejector. Therefore, in order to wrap the actuator in a state where it is pushed down to the lower limit, a female screw cylinder is fixed to the upper end of the cylinder, and the lower part of the stem fitting cylinder vertically suspended from the lower surface of the top wall of the pushing down head is reduced in outer diameter. The small outer diameter portion is formed as a male screw cylinder, and the male screw cylinder is screwed to the female screw cylinder for packaging.

[0003]

As shown in FIGS. 4 and 5, the lowering head 20 of the conventional liquid ejector has a small outer diameter at the lower part of the stem fitting tube 23 and a male screw tube at the lower outer diameter portion. The screw is screwed into the male screw cylinder fitted to the upper end of the cylinder as 24, but the upper part of the stem fitting cylinder above the male screw cylinder has a large outer diameter and faces downward at the lower end surface so that the tightening does not loosen due to vibration during transportation. A step is formed so that the lower end surface thereof is pressed against the upper surface of the female screw cylinder during tightening so that the above-described loosening does not occur due to the frictional engagement.

However, when formed in such a manner, when the press-down head 20 is injection-molded with a synthetic resin material, the large-diameter portion 23a of the stem fitting cylinder becomes thick, so that it is required to be formed in the injection molding die. This has the disadvantage that the cooling time of the molten resin material becomes longer and therefore the molding cycle decreases, and if the male screw cylinder of the press-down head is not tightened with an appropriate force, if the tightening is too strong, If it was difficult to unscrew or loosen the screw, it would be difficult to unscrew due to vibration during transportation.

The present invention can improve the molding cycle of the synthetic resin press-down head, and at the same time, even if it is strongly tightened at the time of tightening the male screw cylinder at the lower part of the stem fitting cylinder, the screw-down of the press-down head is not so difficult. It is provided so that a state can be obtained.

[0006]

A liquid ejector having a lower portion of a stem fitting tube 23 hanging down from a lower surface of a top wall having an outer diameter smaller than the outer diameter of the tube, and having the small outer diameter portion as a male screw tube 24. In the synthetic resin press-down head 20, the cylindrical portion above the male screw cylinder 24 has substantially the same outer diameter as the thread diameter of the male screw cylinder, and a plurality of vertical ribs 25 are provided on the outer peripheral surface of the cylindrical portion at substantially equal intervals. did.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a liquid ejector will be briefly described with reference to FIG. 3. Reference numeral 1 denotes a cylinder which is vertically installed in a container body, has a suction valve 2 at its bottom, and a suction pipe
Is installed vertically. An outward flange 5 is provided at the upper end of the cylinder to be engaged with the upper end surface of the mouth and neck of the container via the packing 4, and a fitting cylinder 6 stands up from the inner periphery of the flange.

The lower portion of the actuator 10 is fitted into the cylinder 1. The actuator raises a stem 12 from a cylindrical piston 11 fitted into a cylinder, and a nozzle is provided at an upper end of the stem.
The press-down head 20 with 22 is fitted. A discharge valve 14 is provided at the upper end of the stem. The actuator is biased upward by a spring 15, and in the illustrated example, the actuator 10 is pressed down against the bias, and a stem fitting tube 23 vertically suspended from the top wall 21 of the push-down head. Male screw cylinder 24 formed at the bottom of
It is screwed into a female screw cylinder 7 fitted to a fitting cylinder 6 rising from the upper end of the cylinder. Reference numeral 8 denotes a guide rod that is inserted into the stem 12 and stands upright.

In the above liquid ejector, in the present invention, a stem fitting cylinder 23 hanging down from the lower surface of the top wall 21 of the press-down head 20 is provided.
The upper cylindrical portion of the male screw cylinder has substantially the same outer diameter as the thread diameter of the male screw cylinder 24, and a plurality of vertical ribs 25 are provided on the outer peripheral surface of the cylindrical portion at substantially equal intervals. The number of the vertical ribs may be about eight as shown.

[0010]

[Effects of the Invention] The present invention has the above-mentioned structure, and the upper part of the male screw cylinder 24 formed by the lower part of the stem fitting cylinder 23 of the press-down head 20 has substantially the same outer diameter as the thread diameter of the male screw cylinder, and Since a plurality of vertical ribs 25 are provided at substantially equal intervals on the outer peripheral surface of the cylindrical portion, the cylindrical portion above the male screw cylinder 24 becomes thick as in the conventional case, so that during injection molding with a synthetic resin material, In the above, the solidification cooling of the molten synthetic resin material forming the thick portion does not require time, and the cooling can be accelerated by thinning the cylindrical portion, so that the molding cycle can be improved. I can do it. When the press-down head 20 is tightened to the female screw cylinder 7 of the liquid ejector, only the lower end face of each of the vertical ribs 25 comes into pressure contact with the upper end face of the female screw pipe. However, the tightening force is reduced by the elastic deformation of the vertical rib, and when the consumer unscrews the press-down head, it is not difficult to unscrew it.

[Brief description of the drawings]

FIG. 1 is a perspective view of a head of the present invention.

FIG. 2 is a bottom view of the head.

FIG. 3 is a half sectional view showing a state where the head is attached to a liquid ejector.

FIG. 4 is a perspective view of a conventional head.

FIG. 5 is a bottom view of a conventional head.

[Explanation of symbols]

 20 Push-down head 23 Stem fitting tube 24 Male screw tube 25 Vertical rib

Claims (1)

(57) [Scope of request for utility model registration] 1. A liquid ejector made of synthetic resin, wherein a lower portion of a stem fitting tube 23 hanging down from a lower surface of a top wall has an outer diameter smaller than an outer diameter of the tube, and the small outer diameter portion has a male screw tube 24. Press-down head 20
In the liquid ejection, the cylindrical portion above the male screw cylinder 24 has substantially the same outer diameter as the thread diameter of the male screw cylinder, and a plurality of vertical ribs 25 are provided on the outer peripheral surface of the cylindrical portion at substantially equal intervals. Vessel head.