JP4697632B2 - Pinch grip type bottle container - Google Patents

Description

  The present invention relates to a pinch grip type bottle type container in which a grip function part is integrally formed by forming recesses oppositely on both side wall portions of a body part of a large synthetic resin bottle type container with a grip (handle) function part. Is.

As a prior art of a large plastic bottle container with a grip function part, in addition to a bottle container in which a separately formed handle is attached to the container body, Patent Document 1 discloses a finger on both side walls of the body. A pinch grip type bottle-shaped container is described in which a concave portion for contact is formed, and a small concave portion in which each finger is engaged with the concave portion is formed, and the grip portion including the back region of the trunk portion is used.
Japanese Patent Laid-Open No. 2003-165518

  The pinch grip type bottle container described above has reduced manufacturing costs, simplified the manufacturing process, and saved resources of resin materials compared to a bottle container that has a separately molded handle attached to the container body. There are many advantages in terms of conversion.

Further, in the above-mentioned pinch grip type bottle-type container, for example, for the purpose of storing alcoholic beverages, a large-sized casing container having a size of about 2.7 liters has been put into practical use, and a further large size is being studied. Further, it is necessary to further reduce the thickness from the viewpoint of resource saving and cost reduction.
However, in such a pinch grip type bottle-type container, when the container is accidentally dropped, the internal pressure abruptly rises due to the impact, and the concave portion or small concave portion formed for finger contact as described above, etc. There is a problem that a so-called buckling occurs in which the wall is reversely deformed to the outside so as not to be restored in the vicinity of the concave portion.
Such a problem is a more serious problem due to the increase in size and thickness of the container, and an effective countermeasure for preventing buckling is required.

  Therefore, the present invention was created to solve the above-described problems in the prior art, and in particular, it is a technical problem to prevent buckling due to a drop impact. It is an object of the present invention to provide a pinch grip type bottle container that can be used with heart.

  The basic idea of the present invention is to use a back wall portion that is easy to bulge and deform because of a flat shape with a large area, compared to a concave portion formed in a grip portion or the like. The shape is capable of bulging deformation that can be expected to increase in capacity, and absorbs a sudden increase in internal pressure due to a drop impact to prevent buckling at the concave portion described above.

Of the present invention, the means of the first invention is:
A pinch grip made of synthetic resin, which is formed with a concave part for finger contact facing each of both side wall parts of the body part, and a grip part is formed by both the concave parts and the back wall part between the two concave parts. In the bottle type container,
The back wall portion has a shape in which a step is formed along the circumferential direction by bending the wall, and the back wall portion is configured to bulge and deform toward the outside in a recoverable manner with respect to the pressure increase in the container.

In the first aspect of the invention , the back wall portion is formed into a shape in which a step is formed along the circumferential direction by bending the wall, so that the surface length along the circumferential direction in the back wall portion is increased by the step. The circumferential length of the body portion can be increased while increasing the length and maintaining the cross-sectional area substantially constant. When the pressure inside the container rises, a tensile force (so-called hoop stress) acts in the circumferential direction, and a bent portion of the wall (hereinafter referred to as a bent portion) is extended at this stepped portion. The function of relieving an increase in internal pressure by deformation of the above (hereinafter referred to as a pressure absorption function) is exhibited.

  Here, the pressure rises suddenly due to a drop impact, but the back wall portion is usually large in area and has a shape close to a flat surface so that it can be easily gripped. Compared to the other concave portions, the back wall portion first bulges and deforms first in comparison with the portion that is easily bulged and deformed. And by fully exhibiting the pressure absorption function by this bulging deformation, the reverse deformation of other concave portions can be effectively prevented.

Then, after the fall, when the action of the force due to the impact is settled for a while, the original shape is naturally restored by the elastic restoring force acting on the extended bent portion.
Note that the number of steps to be formed, arrangement position, lengthwise dimension, step depth dimension, bending angle, etc. are determined in consideration of the bulging deformation mode, volume increase necessary for pressure absorption, etc. It is a design matter that can be.

2nd invention adds the formation of a several level | step difference to the structure of 1st invention in the left-right symmetric position of a back wall part.

In this second invention , by forming a plurality of steps at symmetrical positions of the back wall portion, the back wall portion can be bulged and deformed evenly on the left and right sides, and the bulging deformation and its restoration The deformation can be achieved more effectively and smoothly.

According to a third aspect of the invention , in the configuration of the first or second aspect of the invention , the flat cross-sectional shape of the back wall portion is a gently curved shape that protrudes outward, and the wall is bent inward from the curved wall surface. Is added.

In the third aspect of the invention , the flat cross-sectional shape of the back wall portion is made to be a gently curved shape that protrudes outward, that is, the back wall portion is originally bulged, so that Due to the increase in pressure due to impact, a tensile force related to the hoop stress acts instantaneously in the circumferential direction of the back wall portion, and the bent portion formed by bending the wall inward from the curved wall surface by this tensile force smoothly The pressure absorption function can be exhibited more effectively.

4th invention adds the formation of a level | step difference over the substantially whole height range of a back wall part to the structure of 1st , 2nd, or 3rd invention .

In this 4th invention , the pressurization absorption function by a level | step difference can be exhibited over substantially full height of a back wall part, and the pressurization absorption function can be exhibited more efficiently.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the first invention, when the pressure inside the container rises, a tensile force acts on the back wall portion in the circumferential direction, and the bent portion of the step is extended. Is effectively demonstrated.
In addition, when the action of the force due to the impact is settled after a while after dropping, the original shape is naturally restored by the elastic restoring force acting on the extended bent portion.

In the second invention , the back wall portion can be bulged and deformed equally in the left and right directions, and the bulging deformation and its restoring deformation can be achieved more effectively and smoothly.

In the third invention , since the back wall portion is originally formed in a bulging shape, a tensile force related to hoop stress acts instantaneously in the circumferential direction of the back wall portion at the time of a drop impact, and this tension is applied. The bent portion formed by bending the wall from the curved wall surface by force can be smoothly extended, and the pressure absorption function can be exhibited more effectively.

In the fourth invention , the pressure absorption function due to the step can be exhibited over substantially the entire height of the back wall portion, and the pressure absorption function can be exhibited more efficiently.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 5).
The pinch grip type bottle container shown in the figure is a large, biaxially stretched blow molded product made of polyethylene terephthalate (hereinafter referred to as PET) resin. A thread is engraved on the outer peripheral surface of the bottom end of the cylindrical body 1 with a bottom 14 that performs a seating function at the lower end via a tapered cylindrical shoulder 15 that has a diameter reduced upward. It has a structure in which the provided cylindrical mouth tube portion 17 is continuously provided.

  The trunk portion 1 having reinforcing circumferential ribs 13 provided at both upper and lower end portions, which are the boundary portion between the bottom portion 14 and the shoulder portion 15, has a posture in which the side wall portions 2 are slightly opposed to the upper side and the rear side portion from the side. A pair of vertically long recesses 3 are formed in a recessed manner, and both the recesses 3 and the back wall portion 10 positioned between the both recesses 3 form a grip portion 12 having the recesses 3 as finger contact recesses.

In addition, each recess 3 is provided with three reinforcing ribs 8 (see FIG. 2) extending in an arch shape. The three reinforcing ribs 8 divide the inside of the recess 3 into four small recesses 3a. Thus, the fingertip of each finger is stably positioned in any one of the small recesses 3a, and the mechanical strength of the recesses 3 is increased.
Anti-slip protrusions 7 are formed on the side surfaces 4 of the recesses, and small protrusions 9 are formed on the bottom surfaces 5 of the small recesses 3a in order to improve the releasability of the blow-molded bottle container from the blow mold.

Next, the back wall portion 10 located between the concave portions 3 is formed so as to be depressed over substantially the entire height range of the trunk portion 1 with its periphery surrounded by a ridgeline (see FIG. 2). . Then, a step 22 is formed along the circumferential direction by bending the wall in a total of four locations symmetrically across the entire height range of the back wall portion 10.
In addition, the horizontal rib 11 etc. can also be formed in the back wall part 10 like this embodiment example (refer FIG. 3), but the level | step difference 22 is formed intermittently up and down of this horizontal rib 11 part. The formation mode of the step 22 can be various variations in consideration of the pressure absorption function.

  FIG. 5 is a plan sectional view of the back wall portion 10 (in the range of BL-BR in FIG. 3) taken along the line BB in FIG. 3. As can be seen from FIG. The flat cross-sectional shape of 10 has a gently curved shape that protrudes outward as a whole, and a step 22 is formed by bending the wall inward from the curved wall surface 21 indicated by the two-dot chain line. ing.

As a whole, the back wall portion 10 is formed into a gentle curved shape as described above in a flat cross section, that is, an original bulging shape, and the wall is further bent to form the step 22 as described above. As a result of the increase in pressure caused by the above, a tensile force related to the hoop stress acts instantaneously in the circumferential direction of the curved wall surface 21, and the bent portion 23 of the wall forming the step 22 is extended by this tensile force. It is deformed toward the shape of the arcuate bulging surface 24 indicated by a two-dot chain line. As a result, the cross-sectional area is increased, the volume of the container is increased correspondingly, and the pressure absorption function is exhibited.
Further, after the fall, when the action of the force due to the impact is settled, the bent portion 23 in the extended state naturally returns to the original shape by an elastic restoring force.

  Here, since the pressure absorption function in the back wall portion 10 is instantly exhibited, the reverse deformation in the vicinity of the concave portion 3 or the small concave portion 3a of the grip portion 12 can be suppressed.

  As mentioned above, although embodiment of this invention was described using the embodiment, this invention is not limited to this Example. The detailed shape or material of the pinch grip type bottle-type container in this embodiment is merely an example. For example, in addition to the PET resin, other synthetic resins such as a polypropylene resin can be used as the material, and the detailed configuration thereof can be used as various variations as long as the concept and scope of the present invention are not exceeded. It can be applied to large containers.

  Further, the back wall portion does not necessarily have to be in the entire height range of the trunk portion, and the flat cross-sectional shape thereof may be a flat surface shape, or may be a gently curved shape having a concave inside. For example, depending on the application, it may be necessary to exert a reduced pressure absorption function on the back wall portion. In such a case, the reduced pressure absorption function as well as the ease of gripping and the pressure absorption function related to the impact of dropping are included. The flat cross-sectional shape of the back wall portion can be set while considering the above.

  In addition, the number of steps to be formed, the arrangement position, the length dimension, the depth dimension of the step, the bending angle, etc. are determined in consideration of the form of bulging deformation, the volume increase necessary for pressure absorption, etc. It is a design matter that can be.

  As described above, the pinch grip type bottle-type container of the present invention can effectively prevent buckling due to a drop impact even if it is large and thin. A wide range of applications can be expected.

1 is an overall front view showing an embodiment of the present invention. It is a whole side view of the embodiment shown in FIG. FIG. 2 is an overall rear view of the exemplary embodiment shown in FIG. It is the whole plane sectional view which looked at the cutting arrow along the AA line in FIG. FIG. 4 is a plan sectional view of a back wall section taken along line BB in FIG. 3.

DESCRIPTION OF SYMBOLS 1; Body part 2; Side wall part 3; Concave 3a; Small recessed part 4; Concave side surface 5; Concave bottom face 7; Anti-slip protrusion 8; Reinforcement rib 9; Small protrusion 10; Back wall part 11; Part 13; reinforcing peripheral rib 14; bottom 15; shoulder 16; panel wall part 17; mouth tube part 21; curved surface 22;

Claims (2)

Each of the side wall portions (2) of the body portion (1) is formed with a finger rest recess (3) facing each other, and the back wall between the recesses (3) and the recesses (3). In the pinch grip type bottle-shaped container made of synthetic resin that forms the grip portion (12) with the portion (10),
The flat cross-sectional shape of the back wall portion (10) is a gently curved shape convex outward.
Bending a wall inward from the curved wall surface to form a plurality of steps (22) along the circumferential direction at symmetrical positions of the back wall portion (10);
A pinch grip type bottle-type container in which the back wall portion (10) is configured to bulge and deform outwardly in a recoverable manner against pressure increase in the container due to a drop impact . Pinch-grip bottle-shaped container according to claim 1, wherein substantially formed over the entire height range of the step (22) a back wall portion (10).

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