JP2020037074A - Atomizer - Google Patents

Abstract

To provide an atomizer which has proper moldability, the weight of which is as light as possible, and which is excellent in workability.SOLUTION: An atomizer 20 according to the present invention comprises a tank 12 and a pump unit. In the atomizer 20, the tank 12, which is formed by blow molding, has an exterior wall surface provided with a recess 24 for a handgrip. The recesses 24 are formed on exterior wall surfaces 12a and 12b that are positioned in a parting direction of a molding tool. Both ends of the recess 24 are not opened on a side wall surface 12c where a parting line exists.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a sprayer for spraying liquid.

BACKGROUND ART A backpack type or a shoulder type sprayer for spraying a liquid is known (for example, Patent Document 1: JP-A-2006-87496).
As shown in FIGS. 6 and 7, the tank 12 in the backpack sprayer 10 has a height from a surface (rear surface) 12a in contact with the back of the worker to a front surface 12b in order to easily carry the back of the worker. Generally, the height of the side wall surface 12c) is low, and when viewed from the front side, the lower portion 12d is generally wide and both shoulders 12e are round and flat.

The tank 12 in the backpack type or shoulder type sprayer 10 is formed by blow molding. In this case, the molding die is designed so that the parting line is located on the side wall surface 12c of the tank 12 in order to make the cavity of the molding die shallow and facilitate die cutting.
A spout for pouring the liquid is formed in the upper part of the tank 12 in the sprayer 10, and a cap 14 for opening and closing the spout is provided. A handle 16 for carrying the tank 12 is formed on the cap 14.
In addition, recesses 18 for handling are formed on both side wall surfaces 12c of the tank 12 so that the tank 12 can be carried even with the cap 14 removed.

The recessed portion 18 for handling of the tank 12 is provided in the side wall surface 12c of the tank 12 at the position of the both shoulders 12e so as to extend in the lateral direction (the direction of mold splitting).
The concave portion 18 is provided on the side wall surface (the surface on which the parting line exists) 12c of the tank 12 in order to facilitate die removal during blow molding.
The reason why the concave portions 18 are provided on both shoulder portions (upper portion of the tank 12) 12e of the tank 12 is to enable the tank 12 containing the liquid to be carried in a stable state.

JP-A-2006-87496

However, when the recess 18 is provided on both shoulders 12 e of the side wall surface 12 c of the tank 12, there is a problem that the thickness of the upper and lower edges A and B of the recess 18 is reduced.
The reason why the thickness of the edges A and B is reduced is as follows.
That is, when the tank 12 is formed by blow molding, the cylindrical parison is positioned in the mold, air is blown into the mold, and the parison is pressed against the inner wall of the cavity of the mold by air pressure, and the parison is formed. It is formed into a predetermined shape by stretching the shape along the inner wall of the cavity.

  When the concave portion 18 is provided on the side wall surface (the surface where the parting line exists) 12c of the tank 12, it is easy to remove the mold, but the concave portion 18 is formed on the front surface and the rear surface of the tank 12 as clearly shown in FIG. It will open. That is, although the concave portion 18 is provided on the side wall surface 12b having a low height, both ends thereof are formed in the front and rear surfaces of the tank 12 and are long in the lateral direction.

  The formation of the concave portion 18 inevitably reduces the thickness of the concave portion 18 because the creepage distance of the mold with respect to the inner wall of the cavity becomes longer than that of other portions. However, since the bottom surface of the concave portion 18 is received by being brought into contact with the convex portion for forming the concave portion of the molding die, the thickness is secured to a required thickness. , The parison is stretched into the depression, so that the wall thickness at the edges A, B of the recess 18 is reduced.

  Also, since the concave portion 18 is a laterally long concave portion that opens on the front and rear surfaces of the tank 12, the corner portion of the concave portion 18 near the opening portion that opens on the front and rear surfaces of the tank 12 (in FIG. A and B), the distance from the center of the cylindrical parison is increased, the degree of extension of the parison is large, and the wall thickness at this corner is particularly thin.

For this reason, conventionally, the parison itself has been made thicker in consideration of the thinning of the edges A and B of the recess 18.
However, when the thickness of the parison is increased, not only is the moldability inferior, but also the thickness of other parts becomes unnecessarily thick, the overall weight increases, and the workability as a sprayer is poor.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a sprayer that has good moldability, is slightly lighter in weight, and is excellent in workability.

In order to achieve the above object, the present invention has the following configuration.
That is, in the sprayer according to the present invention, in the sprayer having a tank and a pump unit, the tank is formed by blow molding, and has a concave portion for handling on an outer wall surface, and the concave portion is formed in a mold split direction of a molding die. It is characterized in that it is formed on the outer wall surface that is located, and both ends are concave portions that do not open on the side wall surface where the parting line exists.

It is preferable that the outer wall surface located in the die-cutting direction around the concave portion be a flat surface.
The concave portions may be provided at two positions on a rear surface and a front surface, which are the outer wall surfaces located in a mold splitting direction of a molding die.

  ADVANTAGE OF THE INVENTION According to this invention, while forming the recessed part for a handle | tool in the outer wall surface located in the mold-parting direction of a shaping | molding die, both ends do not open to the side wall surface in which a parting line exists (it does not reach a side wall surface). Since the concave portion has a short length, the degree of elongation of the cylindrical parison around the convex portion of the mold for forming the concave portion during blow molding is reduced, and the edge of the concave portion (particularly, the corner portion thereof) is formed. ) Can be minimized. Therefore, it is not necessary to make the parison so thick as compared with the past, so that the formability is improved, and the necessary strength of the tank is secured, the weight can be reduced, and a sprayer with excellent workability is provided. it can.

It is a rear view of the sprayer concerning this Embodiment. It is a front view of the sprayer concerning this Embodiment. It is a right side view of the sprayer concerning this Embodiment. It is a left view of the nebulizer concerning this Embodiment. It is a partial sectional view of a sprayer concerning this embodiment. It is a front view of the conventional nebulizer. It is a left view of the conventional sprayer.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is a rear view of the sprayer 20 according to the present embodiment, FIG. 2 is a front view thereof, FIG. 3 is a right side view thereof, FIG. 4 is a left side view thereof, and FIG.
In the sprayer 20 according to the present embodiment, the same members as those in the conventional sprayer 10 shown in FIGS. 6 and 7 are denoted by the same reference numerals, and the description thereof may be omitted.

12 is a tank, 14 is a cap, and FIG. 16 is a handle.
12a is the back of the tank 12, 12b is the front of the tank 12, 12c is the side wall of the tank 12, 12d is the lower part of the tank 12, and 12e is the shoulder of the tank 12.
A storage box 22 stores a pump unit (not shown) and a battery (not shown). A hose (not shown) having a nozzle at the tip is connected to the pump unit.

The tank 12 is formed by blow molding as in the related art. The material of the tank 12 is not particularly limited, but high-density polyethylene or the like can be used.
The tank 12 has a low height (the height of the side wall surface 12c) from the surface (rear surface) 12a in contact with the back of the worker to the front surface 12b side so that the tank 12 can be easily carried on the back of the worker as in the related art. Also, when viewed from the front side, the lower portion 12d is formed to be wide and both shoulders 12e are formed in a round flat shape.

  The parting line (not shown) of the tank 12 is formed so as to be located on the side wall surface 12c of the tank 12 in order to make the cavity of a mold (not shown) for blow molding shallower to facilitate die cutting. The mold is designed.

In the present embodiment, a concave portion 24a for handling is provided in an upper portion of a back surface 12a which is an outer wall surface of the tank 12 which is located in a mold split direction. Further, a recess 24b for handling is provided in a lower portion of the front surface 12b which is the other outer wall surface of the tank 12 located in the mold splitting direction. Both recesses 24a and 24b are formed at both ends in recesses that do not open on the side wall surface 12c where the parting line (not shown) exists.
That is, each of the concave portions 24a and 24b has its lateral length shortened so that both ends do not reach the side wall surfaces 12c.

  Since the two concave portions 24a and 24b are provided on the front surface 12b and the rear surface 12a located in the mold dividing direction of the molding die, in order to enable die cutting, it is necessary to adopt a shape that does not generate an undercut portion in the mold dividing direction. Of course.

  The back surface 12a of the tank is formed as a whole so as to substantially follow the curvature of the back of the worker, but the portion around the concave portion 24a can be regarded as a substantially flat surface. Further, the periphery of the concave portion 24b on the front surface 12b can be regarded as a substantially flat surface.

  In the present embodiment, as described above, the recesses 24a and 24b are short lengths that do not open to the side wall surface 12c of the tank 12 (do not reach the side wall surface 12c). , 24b, the extent to which the cylindrical parison is stretched around the projections is small, and the thickness of the edges (particularly the corners) of the recesses 24a, 24b is minimized. Can be prevented. Therefore, in the present embodiment, it is not necessary to make the parison so thick as compared with the related art, so that the moldability is improved and the required strength of the tank 12 is secured, and the weight can be reduced. The nebulizer 20 excellent in workability can be provided.

  If the portions forming the recesses 24a and 24b are formed as flat surfaces of the back surface 12a and the front surface 12b, the conventional technology can be applied to a case where the shoulder 12e has a large curvature as in the related art. In comparison, since the parison elongates relatively evenly, it is possible to prevent the edges of the concave portions 24a and 24b from being partially thinned.

In the present embodiment, the concave portions 24 are provided at two positions. However, the concave portions 24 may be provided at only one position on the rear side (or the front side), which is the upper part of the tank 12. In this case, the other handle may be the lower surface of the tank 12.
Alternatively, the concave portion 24a may be provided on the tank 12 and the other concave portion 24b may be provided on the storage box 22 side.

12 tank 12a back surface 12b front surface 12c side wall surface 12d lower part 12e shoulder 14 cap 16 handle 20 sprayer 22 storage box 24a recess 24b recess

Claims (3)

In a sprayer having a tank and a pump unit,
The tank is formed by blow molding and has a concave portion for handling on an outer wall surface,
The sprayer, wherein the recess is formed on the outer wall surface located in the mold-parting direction of the molding die, and both ends are recesses that do not open on the side wall surface where the parting line exists.   The sprayer according to claim 1, wherein the outer wall surface located in the die-cutting direction around the concave portion is a flat surface.   The sprayer according to claim 1, wherein the concave portion is provided on a rear surface and a front surface, which are the outer wall surfaces located in a mold dividing direction of the forming die.

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