JP3259076B2 - Synthetic resin bottle with handle and molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large synthetic resin bottle with a handle formed by biaxial stretch blow molding, and more particularly to a synthetic resin with a handle in which a separately formed handle and a bottle body are firmly assembled. The present invention relates to a bottle and a molding method.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 63-147429 discloses a large-sized synthetic resin bottle with a handle constituted by assembling a separately molded bottle body and a handle. There is a bottle.

In this prior art bottle, an arcuate recess is formed at the rear of the body of the bottle body, and a fitting projection is vertically provided in the center of the recess in an arc shape. A long groove is vertically formed by closing both ends on both left and right sides of the frame, and a frame as a handle is provided between the upper and lower ends of the front frame plate portion forming an arc, and a front frame of the frame is formed. Engagement ridges are attached to the left and right sides of the plate part, and the frame body is forcibly pressed from behind the concave part, thereby forcibly overcoming the engagement ridge against the long groove forming wall part, and The frame as a handle is assembled so as not to be detached.

[0004]

The prior art described above is
Although it is possible to achieve a firm assembling of the handle to the bottle main body, since assembling the handle to the bottle main body requires a strong working force, special equipment is required to assemble the handle to the bottle main body. There was a problem that the unit price was high.

Further, since the bottle body is a biaxially stretched blow-molded product, its wall thickness is thin. Therefore, when a strong working force is applied to assemble the handle to the bottle body, the acting force causes the bottle body to become loose. However, there is a problem that irregular deformation such as buckling deformation may occur, and a defective product may be generated when the handle is attached.

Since the bottle body is a biaxially stretched blow-molded product, its wall thickness is thin, and therefore, elastic deformation due to a load is apt to occur at the portion where the engagement with the handle is assembled. There has been a problem that the bending and assembling force of the engagement between the bottle main body and the handle is weakened due to the bending deformation, and the assembly of the handle to the bottle main body is released.

Further, the holding of the handle in the assembled state with respect to the bottle main body is achieved only by the engagement of the engaging ridge with the long groove. Since this is achieved by forcibly climbing over the wall, it is easy for rattling to occur when the handle is assembled to the bottle body, which may make handling of the bottle holding the handle unstable. There was a problem.

Further, the bottle body and the handle are formed separately, and the bottle body is a biaxially stretch blow-molded product, whereas the handle is an injection-molded product. There is a great difference in the molding dimensional accuracy of the joint part, which makes it difficult to make the engagement assembly between the bottle body and the handle without looseness, and the engagement of the bottle body side which is a biaxially stretch blow-molded product. Since the degree of protrusion of the mating portion cannot be sharpened, there is a problem that the engaging engagement of the handle with the bottle main body cannot always be stably and strongly achieved.

In view of the above, the present invention has been devised in order to solve the above-mentioned problems in the prior art, and it is intended to prevent the occurrence of the bending deformation displacement of the engagement-assembled portion on the bottle body side with respect to the handle when a load is applied. It is another technical object of the present invention to eliminate the problem and to strengthen the assembling force of the handle with respect to the bottle body, thereby stably and firmly assembling the handle with the bottle body.

[0010]

Means for solving the above-mentioned technical problem is that a vertical projection is provided on the bottom surface of a concave portion which is depressed at the rear portion of the body, and both side surfaces of the vertical projection are provided. A protrusion is formed on the bottom of the recess near the vertical protrusion, and a fitting edge is provided at the opening. Having a biaxially stretched blow-molded bottle body formed with a blind hole-shaped fitting hole portion having a reduced opening area, and a pair of parallel disposed having a tip end surface abutting against the bottom surface of the concave portion of the bottle body. A handle plate is integrally provided between the upper and lower ends of the assembled beam pieces, and an engaging projection that engages with an engagement groove of the bottle main body is protruded on opposing surfaces of both assembled beam pieces. bunch projecting from the engaging protrusion having a tip enlarged portion to the tip to be fitted into the fitting hole of the
Holding hands .

[0011] It is effective to provide a supporting projection projecting from the bottom surface of the concave portion of the bottle main body so as to be in contact with the outer surface of both assembled beam pieces of the assembled handle.

It is preferable that the enlarged end of the fitting projection of the handle has a fitting groove formed between the distal end surface of the handle and the engaging projection. It is preferable to form a notch in the mating piece to increase the groove width of the fitting groove formed between the engaging piece and the enlarged tip.

It is effective that substantially the entire surface of the assembled beam piece except for both ends of the front end face of the handle is straight and flat, and it is advantageous that the handle has a plane-symmetric structure vertically and horizontally. is there.

Means of the present invention for solving the above-mentioned technical problem is to provide a vertical projection on the bottom surface of a recess depressed at the rear of the body, and to form a vertical strip on both sides of the vertical projection. The bulging piece protrudes, an engaging groove is formed between the bulging piece and the bottom surface of the concave portion, and a fitting edge is provided in the opening at the bottom surface of the concave portion near the vertical protruding portion side to reduce the opening area. A handle plate is integrated between the upper and lower ends of a pair of assembled beam pieces that are arranged in parallel with a tip end surface that abuts against the bottom surface of the concave portion of the bottle body. An engaging projection that engages with the engagement groove of the bottle main body is provided on the opposing surface of the beam piece with both sets, and a front end bulging portion is provided at the front end face that fits into the fitting hole of the bottle main body. A method of forming a bottle with a handle, which is immovably assembled with a handle protruding a fitting projection having the same, a beam with a handle, a tip end face of the beam with the assembly, and a beam with a assembly In one piece The bottle main body is biaxially stretch-blow-molded using the provided engaging projection and the fitting projection protruding from the distal end surface and having an enlarged distal end portion as an insert material, so that the bulging piece of the bottle main body and Forming a fitting hole having a fitting edge.

[0015]

The handle is attached to the bottle body by means of a vertical projection provided on the bottom surface of the recess of the bottle body, a pair of assembling beam pieces of the handle being engaged with the engaging projection, and a bulging piece of the bottle body. In the state where it is locked to, engage with the engagement groove, hold it from both sides,
This is achieved and maintained by fitting the fitting protrusion into the fitting hole of the bottle body.

When the handle is assembled to the bottle body, the handle cannot be detached from the bottle body. This is achieved by the locking of the projection piece and the fitting of the fitting projection to the fitting hole of the bottle body. The fitting of the fitting projection to the fitting hole is performed by the engagement of the engagement projection. While maintaining the engagement with the engagement groove, the handle is prevented from being displaced and displaced with respect to the bottle main body in a state where the engagement protrusion is engaged with the engagement groove.

That is, when the fitting protrusion on the handle side is fitted in the fitting hole on the bottle body side, the engagement of the handle with the bottle body is weakened. It is difficult for the bottom of the concave portion provided with the vertical projection to bend in the direction of reducing the width of the vertical projection by the self-shape retention capability of the handle, and the engagement between the engagement projection and the engagement groove is reduced. The flexure deformation of the two-piece beam pieces of the handle, which maintains the engagement stably and also weakens the assembling of the handle with the bottle body, specifically, the two-piece beam pieces reduce the distance between them. By preventing the occurrence of bending deformation in the expanding direction, the engagement between the engagement protrusion and the engagement groove is stably maintained, and further, in a state where the engagement protrusion is engaged with the engagement groove, The displacement of the handle along the groove direction with respect to the bottle body is strongly prevented.

Further, since the fitting projection of the handle which fits into the fitting hole of the bottle body has an enlarged tip at its protruding tip, the fitting protruding piece is fitted in the fitting hole. The fitting edge of the fitting hole is fitted into the fitting groove formed between the enlarged portion, the front end surface, and the engaging projection, so that the fitting hole cannot be pulled out. Will be fitted. Since the fitting assembling of the fitting protruding piece into the fitting hole which cannot be disengaged is stably maintained by the engagement of the engaging protruding piece with the engaging groove over a predetermined length range, The surrounding trunk portion is not deformed illegally, and the fitting protrusion does not come out of the fitting hole.

The bottle body is biaxially stretch blow-molded using the assembled beam, the front end surface, the engagement projection, and the fitting projection having the enlarged tip portion as an insert material. The bulging piece, the engaging groove, the fitting hole, and the fitting edge, which are the assembled parts of the handle, are both assembled beam pieces, the tip surface,
The engaging projection, the fitting projection having the enlarged distal end at the tip, and the fitting groove are assembled with substantially no gap.

The assembly of the assembled portion of the bottle main body with respect to the handle is achieved by stretching the assembled portion of the bottle main body. Without excessive elastic deformation,
Therefore, when the handle is assembled to the bottle main body, mechanical irregular deformation such as buckling deformation does not occur in the bottle main body which is a biaxial stretch blow molded product.

Further, the assembled portion of the bottle main body is the bottle main body 2.
Since the assembling to the handle is achieved by the stretching deformation accompanying the axial stretching blow molding, the assembling is performed without considering the assembling of the handle after molding and the release from the biaxial stretching blow molding die apparatus. It is possible to set the degree of protrusion of the portion to such an extent that a sufficiently strong assembling force can be exhibited.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. The bottle body 1 which is a large-sized (2.5 to 4.0 liter) biaxially stretch blow-molded synthetic resin bottle,
A recess 3 is formed in the rear part of the upper half of the body 2, and a central portion of the recess 3 excluding the upper and lower ends is formed as an upright flat surface at the center of the recess bottom 4, and is relatively wide along the vertical direction. The protruding ridge-shaped vertical protrusion 5 is formed so as to protrude at a substantially constant height over the entire height range of the recess 3.

On both sides of the central portion along the height direction of the vertical protruding portion 5, protruding pieces 6 in the form of vertical protruding strips are protrudingly provided. Bulging piece 6 and concave bottom 4
An engagement groove 9 is formed at the opening edge of the recessed bottom surface 4 near the center portion along the height direction of the bulging piece 6 to reduce the opening diameter. Forming a fitting hole portion 8 in the shape of a small blind hole, and further, near the outer side of the fitting hole portion 8 on the bottom surface 4 of the concave portion, both assembled beam pieces 13 of the handle 11 assembled.
Of the bottle body 1 by projecting a support projection 10 in contact with the outer surface of the bottle 1, and by an engagement groove 8 including a bulging piece 6, a fitting hole 8 having a fitting edge 9, and the support projection 10. Of the handle 11 is assembled.

The support projection 10 is only required to abut the outer surfaces of both the assembled beam pieces 13 of the handle 11 assembled to the bottle main body 1, and its structure is simply continuous. It may be one that protrudes and protrudes in a shape (see FIG. 1), or one in which a plurality of protrusions are vertically arranged at intervals (see the left half of FIG. 2). 11 beam pieces 13 with both sets
Abuts against the outer surface of the bottle, the two assembled beam pieces 13 are deformed in a direction of increasing the distance between each other (the deformation of the assembled beam pieces 13 weakens the engagement assembling force of the handle 11 to the bottle body 1). Function) to prevent them from doing so.

A handle 11 (see FIGS. 4 to 8), which is a relatively hard synthetic resin injection-molded product, has a pair of bar-shaped assembled beam pieces 1 arranged in parallel with upper and lower ends curved backward.
A flat handle plate 12 is integrally provided between the upper and lower ends of the handle plate 3 in a bridging manner. The handle plate 12 is formed with a large number of concave portions for lightening.

The tip end surface 14 of the pair of beam pieces 13 abutting on the central portion of the concave bottom surface 4 has a linear flat surface like the central portion of the concave bottom surface 4, and extends in the height direction of the distal end surface 14. A fitting projection 16 having a tip extending portion 17 swelling up and down and inward at the tip is protrudingly provided at a center portion along the tip thereof. A protruding ridge-shaped engaging projection 15 is provided, and the front end face 14, the engaging projection 15 and the assembled beam 13 having the fitting projection 16 having the enlarged distal end 17 are provided on the handle 11 side. It constitutes the assembled part.

Assembling of the handle 11 to the bottle body 1 is achieved by biaxially stretch-blow molding the bottle body 1 using the assembled portion of the handle 11 as an insert material. Handle 1
As shown in FIG. 3, the assembled portion of the bottle body 1, that is, the bulging piece 6, the engagement groove 7, and the fitting edge are formed by biaxial stretch blow molding of the bottle body 1 using the assembled portion 1 as an insert material. The fitting hole 8 having the portion 9 and the support protrusion 10 are formed in such a manner that the assembling portion of the handle 11 is held substantially without gaps.

As is apparent from FIG. 3, the support projection 10 of the bottle body 1 is configured such that the assembled beam 13 in which the engagement projection 15 is engaged with the engagement groove 7 is interposed between the projection 13 and the vertical projection 5. In the state of being held, it comes into contact with the outer side surface of the assembled beam piece 13, so that the deformation displacement of both assembled beam pieces 13 to the outside is prevented, and the fitting projection 16
Of the assembly of the handle 11 with respect to the assembly of the bottle body 1 due to the fitting of the handle 11 into the fitting hole 8.
Strong reinforcement.

The fitting edge 9 of the fitting hole 8 of the bottle body 1 is fitted in a fitting groove 18 formed in the fitting protrusion 16 of the handle 11, and the fitting protrusion 16 is fitted. The handle 11 is strongly prevented from coming out of the hole 8 and the engaging projection 15 of the handle 11 is engaged with the engaging groove 7 of the bottle body 1, thereby achieving a strong assembly of the handle 11 to the bottle body 1. maintain.

The end surface 14 of the beam 13 with both sets of the handle 11
Since the same central portion as the one where the engaging projection 15 is provided is a linear flat surface, and the fitting projection 16 is located at the central portion of the distal end surface 14, the handle 11 is held. When the bottle is handled, the fitting hole 8
This prevents local deformation of the bottom surface 4 of the concave portion provided with the groove, thereby firmly and stably maintaining the fitting of the fitting protrusion 16 to the fitting hole 8.

As shown in FIGS. 7 and 8, a notch 1 is formed in the front end portion of the engaging projection 15 facing the enlarged front end portion 17.
9, the handle 11 of the bottle main body 1 is made of an insert material by increasing the groove width of the fitting groove 18 formed between the enlarged tip portion 17 and the engaging projection 15. At the time of the axial stretch blow molding, the formability of the stretch molding of the fitting edge portion 9 fitted into the fitting groove 18 can be improved.

As is apparent from the shape shown in the drawing, the handle 11 has a vertically symmetrical structure in the vertical and horizontal directions. Therefore, the handle 11 is used as an insert material in the biaxially stretch blow molding apparatus for the bottle body 1. When assembling, only the front and rear posture of the handle 11 is considered, and it is not necessary to consider the up and down posture. Therefore, the handle 11 can be easily handled during insert molding, and automation of bottle molding can be easily achieved.

[0033]

Since the present invention has the above-described structure, the following effects can be obtained. A handle is assembled to the bottle main body by the non-removable fit of the handle projection into the fitting hole of the bottle main body and the engagement of the handle projection with the engagement groove of the bottle main body. At the same time, the engagement between the engagement hole and the engagement protrusion is such that the engagement between the engagement groove and the engagement protrusion is stably maintained, and the engagement between the engagement groove and the engagement protrusion is opposite. Can stably maintain the fitting between the fitting hole and the fitting protruding piece, so that the handle can be assembled to the bottle main body strongly and stably. Can be achieved very safely and stably.

The assembled part on the bottle main body side and the assembled part on the handle side exert their assembling force in a direction to prevent bending deformation in a direction to weaken the assembling with each other. There is no need to provide a strong self-shape retention capability to the handle itself, which makes it possible to form the handle relatively thin, thereby reducing the amount of expensive synthetic resin material required to form one handle. be able to.

When the handle is assembled with an insert material, the handle is assembled to the bottle body at the same time as the biaxial stretching blow molding of the bottle body. There is no danger of rigid permanent deformation such as buckling deformation or improper deformation occurring at the assembly part of the bottle body for assembly with the handle. Can be achieved.

When the handle-attached portion is made of an insert material, the bottle-body-attached portion is formed with the handle-attached portion as a part of the molding die surface. Can be assembled with almost no gap, and a strong and stable assembly without rattling of the handle to the bottle body can be achieved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a bottle with a handle semi-vertically shown, showing one embodiment of the present invention.

FIG. 2 is an overall rear view of the bottle of the embodiment shown in FIG. 1 with the left half of the handle cut off.

FIG. 3 is an enlarged plan sectional view taken along the line AA in FIG. 1;

FIG. 4 is an overall rear view of the handle of the embodiment shown in FIG. 1;

5 is an overall side view of the handle shown in FIG.

FIG. 6 is an overall vertical sectional side view of the handle shown in FIG. 4;

FIG. 7 is an overall plan sectional view of the handle shown in FIG. 4 in which the upper half is another embodiment.

8 is a partial side view of another embodiment shown in the upper half of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Bottle main body 2; Body part 3; Concave part 4; Concave bottom surface 5; Vertical protrusion part 6; 12; handle plate 13; assembled beam 14; distal end face 15; engaging projection 16; fitting projection 17; tip bulging portion 18; fitting groove 19;

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-170930 (JP, A) JP-A-6-156502 (JP, A) JP-A-6-155557 (JP, A) 68838 (JP, U) Japanese Utility Model 63-147429 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 49/00-49/80 B65D 23/10

Claims (7)

(57) [Claims] 1. A recess (3) recessed in the rear of the trunk (2).
A vertical projection (5) protrudes from the bottom surface (4) of the concave portion, and a vertical strip-shaped bulging piece (6) protrudes from both sides of the vertical protruding part (5). An engagement groove (7) is formed between the concave bottom surface (4) and the concave bottom surface (4), and a fitting edge (9) is formed in the opening at the concave bottom surface (4) near the vertical protrusion (5). ) And a biaxially stretch blow-molded bottle body (1) having a blind hole-shaped fitting hole (8) with a reduced opening area, and a tip surface (14) contacting the concave bottom surface (4). ), A handle plate (12) is integrally provided between upper and lower ends of a pair of assembled beam pieces (13) arranged in parallel,
An engaging projection (15) that engages with the engagement groove (7) protrudes from an opposing surface of the paired beam (13), and the fitting hole (8) is formed in the distal end surface (14). (17)
A synthetic resin bottle with a handle, comprising: a handle (11) protruding from a fitting projection (16) having the following. 2. A handle (11) attached to the bottom surface (4) of the recess.
The supporting projection (1
2. The synthetic resin bottle with a handle according to claim 1, wherein 0) protrudes. 3. The method according to claim 1, wherein the enlarged tip portion (17) is formed with a fitting groove (18) between the tip end surface (14) and the engagement projection (15). Synthetic resin bottle with handle. 4. A fitting groove (15) formed between the engaging projection (15) and the enlarged tip (17) at a portion of the engagement projection (15) facing the enlarged tip (17). The synthetic resin bottle with a handle according to claim 1, wherein a notch (19) for increasing the groove width of the part (18) is formed. 5. The synthetic resin with handle according to claim 1, 2 or 3 or 4, wherein substantially the entirety of the assembled beam piece (13) except for both end portions of the tip end surface (14) is a straight flat surface. Bottle. 6. The handle according to claim 1, wherein the handle has a vertical and horizontal symmetrical structure.
A synthetic resin bottle with a handle according to item 1. 7. A vertical projection (5) protrudes from a concave bottom surface (4) of a concave portion (3) recessed in the rear portion of the body (2), and the vertical projection (5) is provided.
Vertically bulging pieces (6) protrude from both side surfaces of the fin, and an engagement groove (7) is formed between the bulging piece (6) and the concave bottom surface (4). At the bottom (4) of the recess near the protrusion (5),
A front end surface that comes into contact with the concave bottom surface (4) on the bottle body (1) in which a fitting edge (9) is provided in the opening to form a mating hole-shaped fitting hole (8) with a reduced opening area. (14) A handle plate (12) is integrally provided between upper and lower ends of a pair of assembled beam pieces (13) arranged in parallel with each other. An engaging projection piece (15) that engages with the engaging groove (7) is provided in a protruding manner, and an enlarged tip (17) is attached to the tip that fits into the fitting hole (8) on the tip face (14). Handle (11) with protruding fitting piece (16 )
Is a method of molding a bottle with a handle immovably assembled,
The assembling beam piece (13), the distal end face (14), the engaging projection piece (15), and the fitting projection piece (16) having the tip enlarged section (17) are used as insert materials. The bottle body (1) is biaxially stretch blow-molded to form the bulged piece (6) and the fitting edge.
A method for molding a synthetic resin bottle with a handle for molding a fitting hole (8) having (9).