AU609744B2 - Hollow container of biaxially oriented synthetic resin engaged with base cap on bottom and method of engaging the cap with the container - Google Patents

Description

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COMMONWEALTH of AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION (Original) FOR OFFICE USE Class Int. Class Application Number: Lodged: Complete Specification Lodged: Accepted: Published: 609744 Priority: Related Art: c c

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This, dorneflt coW.14i1 s7e ilmatln isl rnadc unr~er~ ni hA--- Name of Applicant: c S Address of Applicant:

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c, Actual Inventor -a YOSHINO KOGYOSHO CO., LTD.

No. 3-2-6, Ojima, Koto-Ku, Tokyo,

JAPAN.

YATARO YOSHINO MAMORU OSHIDA KATSUJI MITANI Address for Service: DAVIES COLLISON, Patent Attorneys, 1 Little Collins Street, Melbourne,3000.

Complete specification for the invention entitled: "HOLLOW CONTAINER OF BIAXIALLY ORIENTED SYNTHETIC RESIN ENGAGED WITH BASE CAP ON BOTTOM AND METHOD OF ENGAGING THE CAP WITH *THE CONTAINER" The following statement is a full description of this invention, including the best method of performing it known to us 1 I

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i i container to readily perform the internal cleaning and eliminating the sanitary inconvenience in case of recovering and reusing the solution.

-2- OF THE INVENTION 0*0 0 BACKGROUND OF THE INVENTION This invention relates to a hollow container Cos of biaxially orientated synthetic resin.engaged with 5 a base cap on n the bottom of the container a a method of engaging the cap with the bottom of the case, the biaxial orientation of the bottom wall part f t container.

15 Containers of biaxially orientated synthetic esin are known. When the bottom of this container 1 fo0 is disposed horizontally with respect to the axis of 0 the container body as is used ordinarily in this case, the biaxial orientation of the bottom wall part of the container becomes difficult in the blow-molding step. It is prrferred in order to effectively biaxially orientate the bottom wall part of the container to swell the bottom wall part downwardly in a spherical shape. However, the container causes, if the bottom of the container is formed in a spherical shape, a difficulty of disabling to erect and stationarily standing the container since the bottom is spherical. To eliminate this difficulty, a base cap is engaged and disposed as a trestle for erecting and steadily standing the container to the bottom of the container. When an air vent is not provided at the Vi -1 3- -3 3 66 c- 4 cr C C 66 4' 666661C 6 4' 64' 4 4' 4 SCt 6 4' 66 6 6 66 cap, high pressure air remains between the cap and the bottom of the container due to the introduction of the bottom into the cap in case of engaging the bottom of the container within the cap, thereby causing the cap to be readily removed from the container due to the operation of the high pressure air thus produced.

For this purpose, an adequate number of air vent holes are formed at the cap. When the container with the cap is, for example, submerged, after liquid is filled in the container, in chilled water to cool the filled liquid by a consumer, the chilled water is fed through the vent holes into the space between the bottom of the container and the cap, whereby water is dropped from the vent holes after the container is raised from the chilled water and cannot be dried from the water for a long period of time.

In case of engaging the container body with the base cap, the bottom of the container is mechanically press-fitted into the cap. In this case, since the pressfitting step is performed for a short time, the air in the cap loses its escaping space due to the depression of the bottom of the container into the cap, thereby frequently causing the cap to be incompletely engaged with the container.

Accordingly, an object of the present invention is to provide a method of engaging a hollow container of biaxially orientated synthetic resin with a base cap which alleviates one or more of the problems mentioned above.

20 In accordance with the present invention there is provided a method of engaging a hollow container of biaxially oriented synthetic resin at the bottom portion swelled downwardly in a spherical shape with a base cap having an elastically deformable peripheral wall extending upwardly from the peripheral edge of the bottom wall thereof comprising the steps of: 25 holding said container at a predetermined position on said base cap, moving said base cap towards the container, disposing a rod between the peripheral wall of said base cap and the bottom portion of said container, when engaging said base cap with the container, so as to provide a vent passage to enable the release of air pressure between said base cap and the bottom portion of said container, engaging said base cap with the bottom portion of said container, and removing said rod between the bottom portion of said container and the 1 16C ***see 0 6 6666 4' 66 64' 4 4' 4'D *8608 0046 4' 4 'S AQ T0 013OdbwsDpI3,yoshinole3 -4peripheral wall of said base cap when the bottom portion of said container is urged to the bottom wall of said base cap.

Preferred embodiments of the invention will hereinafter be described with reference to the accompanying drawings in which: Figure 1 is a fragmentary sectional view showing a first embodiment of a hollow container of biaxially orientatcd synthetic resin engaged with a base cap at the bottom of the container; Figure 2 is a fragmentary sectional view similarly showing a second embodiment of a hollow container; Figure 3 is an explanatory view of a first embodiment of the method of engaging the bottom of the container with the base cap; Figure 4 is a plan view showing the shape of the base cap in Figure 3; Figures 5 to 9 are explanatory views showing an embodiment of a method 15 of engaging according to the present invention, wherein Figure 5 is a view showing c c C V IF C 0

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91 dbwspc.o3,yoshinojM,4 7 1 2 3 4 6 7 8 C c C C C C 21 22 S 23 24 26 27 28 29 S the state that the container, the base cap and the air vent rod are disposed; Fig. 6 is a view showing the state that the air vent rod is operated; Fig. 7 is a view showing the operating state of the air vent rod and the adhered state of the container with the cap, Fig. 8 is a view showing the state that the rod is pulled, and Fig. 9 is a view showing the state that the engagement of the container with the cap is completed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The hollow container of biaxially oriented synthetic resin engaged with a base cap and a method of engaging the hollow container with the base cap of the present invention will n )w be described in more detail with reference to the accompanying drawings.

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Fig. 1 shows a first embodiment of tiej hollow container of biaxially oriented synthetic resin engaged with a base cap,- t the n.p.rr ±z*n Reference numeral 1 designates a synthetic resin container molded by a biaxial orientation, the bottom of which is formed in a regular circle in cross section and which is swelled downwardly in a spherical shape.

Reference numeral 3 depicts a base cap engaged with the bottom portion 2 of the container 1, which cap has a function as a trestle for supporting the container 1 in an erected state. The cap 3 is formed by standing an elastically deformable peripheral wall 5 integrally from the peripheral edge of a bottom wall 4 for supporting the lower surface of the bottom portion 2 of 5 i: ii

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6; 1 the container 1 in such a manner that the inner upper 2 surface of the peripheral wall 5 is watertightly engaged 3 with the outer surface of the peripheral wall part of 4 the bottom portion 2 of the lower body of the container 1.

In the embodiment described above, the peripheral 6 wall of the cap 3 is elastically deformable, and a 7 temporary air vent hole can be accordingly formed 8 between the cap and the peripheral wall of the bottom L portion of the container by elastically deforming the II peripheral wall of the cap even without any air vent o I| I' hole at the cap when the bottom portion is engaged within the cap. Since the temporary air vent hole can i' be further eliminated by the elastic recovery of the 14 peripheral wall 5 of the cap 3, it does not take a plently of time to dry chilled water filled in the cap 9 9, 'b even when the container with the cap is submerged in the chilled water as the case that the vent holes are LS. perforated at the cap. In addition, the cap can protect ii I the bottom 2 of the container 1 and can erect and 0 4 a steadily stand the container having a spherical bottom

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31 portion.

22 Fig. 2 shows a second embodiment of tt-Fihollow 33 container of biaxially oriented synthetic resin engaging 24 a bottom. portion of the container with a base cap, An..nr t e .P.en .v -i F.1 The lower end 36 portion 6 of the body of the container 1 is formed with 37 a step 7 which is recessed inside, and the bottom 38 portion 2 of the container 1 is swelled downwardly in a 39 spherical shape from the step 7.

A base cap 3 is engaged with the outer surface of 6- -k

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T 0' 1 the bottom 2 of the container 1. The cap 3 is formed 2 with a peripheral wall 5 elastically deformably erected 3 from the peripheral edge of the bottom wall 4 in the 4 same manner as the first embodiment, and an outward flange 8 is formed at the upper end of the wall 5. The 6 flange 8 has a width equal to the step 7. A projected 7 strip 9 concentric with the wall 5 is circumferentially 8 formed at the bottom wall of the cap 3.

I. In the embodiment described above, the outward j1, flange 8 is formed at the upper end of the peripheral wall i of the base cap. Thus, even if the peripheral wall is elastically deformably formed in a thin wall., the end on c r 30o ,t the peripheral wall can hardly deform, and the bottom 14 portion of the container can be accordingly readily fSe o engaged with the cap, and since outer diameter of the flange is substantially equal to that of the lower end 17 of the container body, the flange and the lower end of i the body becomes the same plane, so that the flange does 19 not become obstacle.

Since the peripheral wall of the cap is formed of 21 elastically deformable synthetic resin material, the 22 peripheral wall can be, even if the bottom portion of 23 the container is slightly increased in diameter due to 24 dimensional error, elongated, with the result that the bottom portion can be effectively engaged with the cap.

26 A method of engaging the bottom portion of the 27 container with the base cap will now be described in 28 more detail.

29 Referring now to Figs. 3 and 4, a base cap 3 is stood at the peripheral wall 5 thereof from the container 1 i 7 .1 i; 1 2 3 4 6 7 8 Scc t C 14 ,17. t t o c 20 00 0 21 22 23 24 26 27 28 S29 within the cap 3, the upper cross sectional shape of the peripheral wall of the cap 3 is pressed inwardly at both right and left sides to form an elliptical shape, the lower surface of the bottom portion 2 of the container 1 is contacted with the upper end of the short diameter portion of the peripheral wall of the base cap 3, the container 1 is pressed down as it is, and the peripheral wall of the cap is deformed in this manner, thereby engaging the bottom portion 2 of the container 1 with the cap 3.

In this manner, the inner surface of the long diameter portion of the peripheral wall of the cap is approached from the state to be -isolated from the outer peripheral surface of the bottom portion of the container to the bottom portion at the long diameter portion as the bottom portion enters into the cap, and when the bottom portion is completely engaged within the cap, the long diameter portion is intimately contacted with the outer peripheral surface of the bottom portion.

Accordingly, an air exhaust hole is formed between the long diameter portion and the outer peripheral surface of the bottom portion of the container, and the air exhaust hole is eliminated by the engagement of the bottom portion within the cap. Thus, even if the bottom portion of the container is engaged within the cap in a short time, high pressure air is not allowed to remain in the cap, but the engagement of the bottom portion of the container with the cap can be perfected.

The peripheral wall, of the base cap may be temporarily formed in an elliptical shape by initially 8

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1 forming it in a regular circular sh.pe in cross section 2 and then pressing both right and left sides in case of 3 engaging the bottom portion of the container wihin the 4 cap.

In the mentod of the above embodiment, the bottom 6 portion of the container is engaged within the cap after 7 the cap is deformed in the elliptical shape of crossa 8 section. However, the cap is, on the contrary, formed .9,90 in a regular circular shape in cross section, both right S9 and left sides of the bottom portion of the container i may be pressed inwardly against the elasticity of the S012 bottom portion in an elliptical shape of cross section, 01f8 and the bottom portion may be engaged within the cap.

14 In this case, when the depression of both the right and ro left sides of the bottom portion of the container is °"Fg simultaneously released upon engagement of the bottom ?r l~2 i portion within the cap, the bottom portion is recovered, and the outer peripheral surface can be intimately contacted with the cap.

o .I According to the above described method,ef te 21 inve ti even if the bottom portion of the 22 container is pressed into and engaged within the cap in 23 ij a short time, the air in the cap does not lose its 24 escaping space, the engagement of the bottom portion within the cap does not accordingly become incomplete, 26 and no hole is formed for exhausting the air at the cap.

27 Therefore, even when the container with the base cap 28 filled with liquid is submerged in chilled water and is 29 cooled, the water filled in the cap does not continuously drop.

9 1 Figs. 5 to 9 show t=h*-ottg preferred embodiments J 2 of ;et method of engaging the bottom portion of a 3 container with a base cap according to the present 4 invention.

As shown in Fig. 5, a container 1 is held at a 6 predetermined position, a base cap 3 on which a hot melt 7 11 is coated on the bottom wall 4 thereof is placed on a 8 lifting jig 10 which is disposed directly under the 9 container 1, and a retaining jig 13 which is mounted at icc the end of a piston rod of a depressing cylinder 12 is disposed to operate a depressing force to the container 1.

C C C The jig 10 is raised by a lifting rod 14 from this C C rCI 3 state to rise the cap 3 toward the container 3, and the 14 jig 13 is simultaneously lowered to contact it with the upper end of the container, thereby holding the Fc 1 ]C container so as not to upwardly displace even if the

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17 lifting force is applied to the container.

18 The cap 3 thus upwardly displaced toward the 19 container 1 is intimately engaged at the opening of the -0J peripheral wall 5 of the cap 3 with the lower end

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S'21 portion 6 of the body of the container 1, whereby the 22 hot melt 11 is urged to the bottom portion 14 of the 23 container 1 as shown in Fig. 7 while the assembling 24 attitude of the cap 3 with the container 1 is maintained adequately.

26 When the bottom portion 16 of the container 1 is 27 further urged to the cap 3, the cap 3 is associated with 28 the container 1 in the state that a sufficiently fine 29 air vent rod 15 is disposed between the cap 3 and the container 1, the rod 15 is pulled between the wall 5 and 10 1 1 2 3 4 6 7 8 V IC 1 4" c t ,11 It t 14 6 St t t 21 22 23 24 26 27 28 29 the container 1 at the position where the bottom wall 4 of the cap 3 coated with the hot melt 11 is urged to the bottom portion 16 of the container.

More particularly, the space formed between the container 1 and the cap 3 is not hermetically sealed since the rod 15 is disposed between the peripheral wall 5 of the cap 3 and the container 1, the space is hermetically sealed after the bottom wall 4 coated with the hot melt 11 is urged to the bottom portion 16 of the container and the rod 15 is then pulled from between the container 1 and the wall Since the rod 15 is pulled at the timing when the bottom wall 4 coated with the hot. melt 11 is urged to the bottom portion 16 of the container, the volume formed between the container 1 and the cap 3 may be increased, but may not be decreased, and the pressure higher than the atmospheric pressure will hot accordingly be produced in the space thus sealed.

The steps of the method of engaging the bottom portion of the container with the base cap of the embodiment according to the present invehtion will now be described in more detail with reference to the accompanying drawings. In Fig. 5, the container 1 is mounted between the jig 13 mounted on the cylinder 12 and the jig 14, and the cap 3 coated with the hot melt 11 is placed on the bottom wall 4 on the jig An air vent rod 15 is forwardly and reversely tlescopically disposed in the vicinity of the container 1 in a telescopic cylinder 17.

When the container 1 and the cap 3 are completely xel.. 11 1 2 4 6 7 8 c c i r C CG 14 .,*ci S1C a 9: 21 22 23 26 27 28 29 set in the state as shown in Fig. 5, the cylinder 17 is first operated as shown in Fig. 6 to forwardly move the rod 15, and when the cap is engaged with the container 1, the rod 15 is disposed between the peripheral wall of the cap 3 and the container 1.

When the rod 15 is completely forwarded, the cylinder 12 and the rod 14 are operated to prevent the ypward displacement of the container 1 by the jig 13, the jig 10 is simultaneously raised to engage the cap 3 with the lower end including the bottom portion 16 of the container 1, the jig 10 is raised until the bottom wall 4 ccated with the hot melt 11 is urged to the bottom portion 16 of the contai-ner 1 as shown in Fig. 6, and is stopped at this position.

This upward movement of the jig 10 may be set by increasing the lifting force acted on the jig 12 through the container 1 to the set value, or may be performed by the projecting distance of the rod 14.

When the jig 10 reaches the upper limit so that the bottom wall 4 coated with the hot melt 11 is urged to the bottom portion 16 of the container, the cylinder 17 is operated in the direction opposite to the above operation as shown in Fig. 8, the rod 15 is retarded, and is removed from between the container 1 and the peripheral wall The peripheral wall 5 which has been elastically deformed as shown in Fig. 7 up to that time due to the removal of the rod 15 from between the container 1 and the peripheral wall 5 is elastically recovered to intimately contact the inner peripheral surface of the 12 1 opening with the lower end portion of the body of the 2 container 1, thereby hermetically sealing the space 3 formed between the container 1 and the cap 3.

4 When the rod 15 is removed from between the container 1 and the peripheral wall 5, the cylinder 12 6 and the 14 are operated in the direction reverse to the 7 previous operation as shown in Fig. 9, the jig 13 and.the 8 jig 10 are retarded and reset, thereby completing the 9 engagement of the cap 3 with the container 1.

T Cd In the above description of steps of the method of i1 the present invention, the timing of pulling the rod 1 C ,,ALC is set at the time of operating the urging force of the jig 10. However, this timing of revoming the rod 15 is 14 not limited only to the above-mentioned time. For 4,1.5 example, the timing of removing the rod 15 may be any time after the bottom wall 4 coated with the hot melt 17 11 is urged to the bottom portion 16 of the container 1 18 and the container 1 is adhered to the cap 3 with the hot 19 melt 11.

cS Cc t In the state that the bottom wall 4 coated with the '21 hot melt 11 by the jig 10 is urged to the bottom 22 portion 16 of the container, the volume of the space 23 formed between the container 1 and the cap 3 becomes the 24 minimum value since the urging force is acted to the cap 3 to slightly elastically deform the cap and the 26 introducing distance of the lower portion of the 27 container into the cap 3 becomes larger than that in the 28 case that the container is not lifted by the jig 29 Accordingly, when the rod 15 is removed to seal the space between the container 1 and the cap 3 at the time 13 1 that the urging f,-'ce of the cap by the jig 10 is 2 operated, the cap 3 is slightly elastically recovered as 3 the ligting force of the jig 10 is released, thereby 4 causing the volume of the space sealed between the container 1 and the cap 3 to be slightly increased to 6 generate negative pressure in the space.

7 The negative pressure generated between the 8 contaniner 1 and the cap 3 is very small, but the negative pressure creates a force for urging the cap 3 and particularly the bottom wall 4 of the cap 3 to the bottom portion 16 of the container 1, thereby causing 12 the hot melt 11 to be solidified. Thus, the bottom wall

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4 can be held in the state urged to the bottom portion 14 16 of the container while the bottom portion 16 is 15 bonded fixedly to the bottom wall 4. Accordingly, the *6 bottom portion 16 may be preferably fixedly bonded with 1Z the hot melt 11 to the bottom wall 4.

.18 According to the method of engaging the base cap 19 with the container of this embodiment as described 0 20 above, the space sealed between the container 1 and the S21f cap 3 may be formed without producing the pressure 22 larger than the atmospheric pressure, thereby preferably 23 performing the fixed bonding of the cap 3 to the 24 container 1 with the hot melt 11 and preventing the deterioration in the engagement of the cap 3 with the 26 container 1.

27 Further, since the space formed between the 28 container 1 and the cap 3 is completely sealed, I 29 cleansing solution or dusts are not entirely introduced into this apce, thereby allowing the shape of the 14

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4% 1 2 3 4 6 7 8 9 I L, 1o 14 .0 17 r 14 26 27 28 29 *6 21 22 23 container to readily perform the internal cleaning and eliminating the sanitary inconvenience in case of recovering and reusing the solution.

Moreover, since the rod 15 may have a thickness of the degree to form a gap, through which the air may pass between the container 1 and the peripheral wall 5 as shown in Fig 7, the engaging attitude of the body of the container 1 will not become defective in the engagement of the cap 3 with the container 1 even if the rod 15 is disposed between the container 1 and the peripheral wall 5, but the container can be engaged with the cap while the stable mutual attitude is maintained.

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Claims (6)

1. A method of engaging a hollow container of biaxially oriented synthetic resin at the bottom portion swelled downwardly in a spherical shape with a base cap having an elastically deformable peripheral wall extending upwardly from the peripheral edge of the bottom wall thereof comprising the steps of: holding said container at a predetermined position on said base cap, moving said base cap towards the container, disposing a rod between the peripheral wall of said base cap and the bottom portion of said container, when engaging said base cap with the container, so as to S c provide a vent passage to enable the release of air pressure between said base cap and the bottom portion of said container, engaging said base cap with the bottom portion of said container, and 6 6*removing said rod between the bottom portion of said container and the I 15 peripheral wall of said base cap when the bottom portion of said container is urged to the bottom wall of said base cap. t CI

2. The method according to claim 1, wherein said base cap has no air vent holes. Se

3. The method according to claim 1, wherein a hot melt for fixedly bonding the bottom of said container is coated on the bottom wall of said base cap.

4. The method according to claim 1, wherein said base cap is raised toward Z, 25 the bottom portion of said container by a lifting jig. The method according to claim 1, wherein said container is held by a retaining jig so as not to be displaced upwards even if an upwardly urging force is applied to the container by the rise of said base cap.

T v 61 30,dbwspe.l3,yoshinope,16 -I--r I 17

6. A method of engaging a hollow container with a base cap substantially as hereinbefore described with reference to the accompanying drawings. DATED this 30th day of January, 1991. YOSHINO KOGYOSHO CO., LTD. By its Patent Attorneys DAVIES COLLISON C- C C C C CC C C C 00 CIt 0 C 00CC 0 C 00 0 0 000000 000000 0 0 00 0* 00 0 0 A~f 910130,dbwspc.013,yoshinojspe17