JP2013177183A - Hinge cap made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinge cap made of synthetic resin including a structure preventing deterioration of airtightness or fitting strength caused by abnormal deformation of rolling or the like during forming in a fitting protruding part circularly projecting in an inner circumferential surface lower part and engaging with a cap body in regard to an upper lid of a hinge cap provided with a cutout recessed part facilitating bending deformation of a hinge in an outer circumferential surface.SOLUTION: A hinge C connecting a cap body A and an upper lid B attached to a container includes a center hinge part 30 connecting an upper end edge of the cap body and a lower end edge of the upper lid in a circumferential center part; and both side hinge parts 31 provided in both sides of the center hinge part, and carrying out connection in a vertically separated position via cutout recessed parts 32 reduced in diameter from the upper end edge and the lower end edge. A slope 36 slanted toward the lower end edge such that a width in a radial direction of the cutout recessed part is broadened to form a draft is provided in an outer circumferential recessed face 35 forming an outer circumferential surface in the cutout recessed part of a side circumferential wall of the upper lid.

Description

  The present invention relates to a hinge cap including a cap main body attached to a container and an upper lid connected to the cap main body via a hinge, and in particular, it is excellent in moldability and can provide stable fitting strength and confidentiality. The present invention relates to a resin hinge cap.

A synthetic resin hinge cap in which a cap body and an upper lid are connected by a hinge is usually molded integrally by injection molding or the like.
The hinge that connects the cap body and the upper lid over a predetermined circumferential range of the outer peripheral edge includes a central hinge portion that connects the upper edge of the cap body and the lower edge of the upper lid at the center of the range, and both sides of the central hinge portion. It has been conventionally known that the two upper hinges are connected to each other at positions spaced apart from the upper and lower edges of the upper and lower edges (see, for example, Patent Document 1).
The hinge part 20 and the elastic plate 21 described in Patent Document 1 correspond to the central hinge part and the double-sided hinge parts, respectively, referred to herein.

JP 2011-246173 A

A notch recess that facilitates bending deformation of both side hinge portions may be provided on the outer peripheral surfaces of the cap body and the upper lid corresponding to the both side hinge portions.
As shown in FIG. 5, the notch recess 32a forms an outer peripheral concave surface 35a having a reduced diameter up to a connecting portion between the upper end edge 6a of the cap body and at least the both-side hinges separated from the lower end edge 25a of the upper lid by a predetermined height. doing.
The outer peripheral concave surface 35a normally forms a vertical wall surface with a reduced diameter width d constant in the vertical direction.

However, when an upper lid having such a notch recess 32a is integrally formed with the cap body, an upper mold having a hanging portion having a shape corresponding to the notch recess 32a is used as a mold, and after molding, The hinge cap formed by releasing the mold is cut off, but the inner peripheral side of the upper lid is formed with an annular fitting bulging portion 24a that protrudes inward to engage with the cap body. At this time, the fitting bulging portion 24a sandwiched between the hanging portion and the upper die is dragged up by the upper die as shown in FIG. There was a case.
As described above, when the fitting bulge portion 24a turns up and deforms abnormally, the airtightness is lowered at this portion, the contents leak, the fitting strength becomes weak, and an inadvertent opening occurs. There was a problem that occurred.

  An object of the present invention is to solve the above problems, and in a synthetic resin hinge cap in which a cap body and an upper lid are connected by a hinge, the fitting protrudes in an annular manner at the lower inner peripheral surface of the upper lid and engages with the cap body It is an object of the present invention to provide a synthetic resin hinge cap having a structure in which the bulging portion does not cause abnormal deformation such as curling at the time of molding and the airtightness and fitting strength are not lowered.

  In order to solve the above problems, the present invention provides a synthetic resin hinge cap comprising a cap body attached to a container as a synthetic resin hinge cap and an upper lid connected to the cap body via a hinge. The top lid is composed of a top wall and a side wall suspended from the periphery of the top wall, and an annular fitting bulge that protrudes inward and engages with the cap body is provided at the lower part of the inner peripheral surface of the side wall. The hinge is connected over a predetermined range in the circumferential direction near the edge where the cap body and the upper lid overlap each other at the outer periphery, and the upper end edge of the cap body and the lower end edge of the upper lid at the center of the predetermined range A central hinge part that is connected to each other, and both side hinge parts that are provided on both sides of the central hinge part and are connected to each other at positions spaced vertically from each other through a notch recess having a diameter reduced from the upper edge and the lower edge. Cutting the side wall On the outer concave surface forming the outer peripheral surface of the recess away, to adopt a configuration, wherein the inclined surface which is inclined is arranged such that the diameter direction of the width of the notched recess widens towards the lower edge.

  As a specific embodiment of the synthetic resin hinge cap, the inclined surface is provided from the height position above the upper base of the fitting bulge to the lower edge of the upper lid. To do.

The synthetic resin hinge cap of the present invention has an inclined surface that is inclined so that a reduced diameter width of the cutout recess is widened toward an outer peripheral concave surface that forms an outer peripheral surface of the cutout recess of the hinge portion of the upper lid toward the lower end edge of the side peripheral wall. When the mold is released from the mold after molding, as the upper mold with the notch recess is raised and separated, the inclined surface plays the role of a falling slope, and the molded hinge cap Since there is a space between the outer peripheral concave surface and the upper mold, and the upper lid can be released while being deformed, the fitting bulging portion of the inner peripheral surface of the upper lid is turned up and abnormally deformed. And stable airtightness and fitting strength can be obtained.
Further, in the embodiment in which the inclined surface is provided from the height position above the upper base portion of the fitting bulge portion to the lower end edge of the upper lid, the mold is released at the height portion where the fitting bulge portion is provided. A space is sometimes generated between the inclined surface and the side wall of the upper lid is deformed so as to escape outward, and abnormal deformation due to turning up of the fitting bulging portion can be reliably prevented.

It is a cross-sectional side view which shows the cover state of the hinge cap which is an Example of this invention. It is a figure which shows the open state of the hinge cap which is an Example of this invention, (a) is a top view, (b) is a cross-sectional side view. It is a partial sectional view of Drawing 2 (a), (a) is an AA sectional view, (b) is a BB sectional view, and (c) is a CC sectional view. (A) is YY sectional drawing of Fig.2 (a), (b) is the same sectional drawing of the hinge cap which is a modification. It is sectional drawing of the same position as the YY cross section of Fig.2 (a) in a prior art.

  Next, the synthetic resin hinge cap of the present invention will be described with reference to the drawings showing examples.

1 and 2, A is a cap body attached to the mouth 1 of the container, B is an upper lid, and is connected to the cap body A via a hinge C.
The cap main body A is attached to the mouth 1 of the container by screws 2.

The upper wall 3 of the cap body A covers the mouth portion 1 of the container from above, and an outer cylinder 4 having a screw 2 on the inner periphery is suspended from the periphery.
At the upper end of the outer peripheral edge of the outer cylinder 4, a step portion 5 having an upper end edge 6 that overlaps the upper lid B and an engaging wall 7 that stands upright on the inner peripheral edge of the upper end edge 6 is provided. An annular lid engaging portion 8 that engages with a fitting bulging portion 24 of the upper lid B, which will be described later, protrudes outward and is continuous with the upper portion of the upper wall 3.

A pouring tube 9 is erected in the center of the upper wall 3, and the pouring tube 9 is formed from a lower base tube 10 and a constricted portion 11 that transitions to an upper mouth tube portion 12 having a diameter smaller than that of the base tube 10. Become.
An inner cylinder 14 that is fitted to the inner periphery of the mouth 1 of the container is suspended from the lower surface of the upper wall 3, and the inner peripheral surface of the inner cylinder 14 communicates with the spout 13 of the dispensing cylinder 9.
A sealing plate 15 for sealing the contents until the container is used is attached to the spout 13.

The upper lid B includes a top wall 20 and a side peripheral wall 21 extending from the periphery of the top wall 20, and a tip fitting portion 23 is fitted to the base tube 10 of the extraction tube 9 on the lower surface of the top wall 20. A sealing cylinder 22 is provided (hereinafter, the vertical direction when showing the portion of the upper lid B is always described in the vertical direction when the lid is closed).
An annular fitting bulging portion 24 that engages with the lid engaging portion 8 of the cap body A is provided at the lower portion of the inner peripheral surface of the side peripheral wall 21 so as to protrude inward.
As shown in FIG. 1, when the lid is closed, the fitting bulging portion 24 of the upper lid B gets over the lid engaging portion 8 of the cap main body A, and the upper surface of the fitting bulging portion 24 and the lid are engaged. An annular sealing surface is formed with the lower surface of the joint 8.

  A lower end edge 25 that overlaps with the upper end edge 6 of the cap body A is formed at the lower end portion of the side peripheral wall 21 of the upper lid B. A hinge C is connected to one of the outer peripheral edges of the lower end edge 25. A knob 26 is provided on the other side of the opposite side.

As shown in FIGS. 2 and 3, the hinge C connects the cap body A and the upper lid B over a predetermined range in the circumferential direction, and the upper end edge 6 of the cap body A and the upper lid at the center of the predetermined range. The center hinge part 30 which connects the lower end edge 25 of B with an outer periphery, and the both-side hinge part 31 provided in the both sides of the center hinge part 30 are comprised.
The both-side hinge portions 31 are connected to the outer cylinder 4 and the side peripheral wall 21 at positions separated vertically from the upper end edge 6 of the cap main body A and the lower end edge 25 of the upper lid B through the notch recesses 32 each having a reduced diameter. .
Thus, a predetermined open state can be maintained by providing the central hinge part 30 and the both-side hinge parts 31 having different connection parts.

As shown by an imaginary line (two-dot chain line) in FIG. 4, the central hinge portion 30 is thick at the connecting portion between the upper end edge 6 of the cap body A and the lower end edge 25 of the upper lid B, and is separated from both connecting portions. It is thin toward the intermediate part 33.
As shown in FIG. 3 (a), the both-side hinge portions 31 are respectively connected to the upper end edges 6 of the cap body A and the upper lid B from the both-side end positions T1 of the central hinge portion 30 toward the both-side end positions T2 of the both-side hinge portions 31. Are connected so as to be separated from the lower edge 25 of the upper lid B, and thick reinforcing end portions 34 are formed at both ends.
In the present embodiment, the central hinge portion 30 and the side hinge portions 31 are integrally connected at the T1 position. However, like the hinge portion 20 and the elastic plate 21 described in Patent Document 1 previously mentioned as the prior art document. The central hinge portion 30 and the side hinge portions 31 may be separated from each other at the T1 position instead of being integrated.

Further, as shown in FIGS. 3B, 3C, and 4A, the both-side hinge portion 31 is connected to the cap body A and the upper lid B at the bottom of the notch recess 32, and the upper lid The outer circumferential concave surface 35 that forms the outer circumferential surface of the side circumferential wall 21 in the B cutout recess 32 has a radial width of the cutout recess 32 toward the lower end edge 25, and the lower end edge than d at the bottom of the cutout recess 32. D1 at 25 is larger, and an inclined surface 36 that is inclined so as to spread toward the lower edge 25 is provided.
FIG. 4B shows a modified example of the present embodiment, in which the inclined surface 36 starts from the middle of the outer peripheral concave surface 35 and is formed so that the width of the cutout concave portion 32 extends to D2 at the lower end edge 25. .
The height from the lower end edge 25 of the starting point 37 of the inclined surface 36 of this modified embodiment is set to a height H higher than the height h of the upper root portion 27 of the fitting bulge portion 24.

Next, usage modes and operational effects of this embodiment will be described.
As described above, the synthetic resin hinge cap in which the cap body A and the upper lid B are connected by the hinge C as in the present invention is usually integrally formed by injection molding or the like.
The hinge cap of this embodiment is molded by injecting a synthetic resin into a cavity formed by a die by pressing the upper die and the lower die from above and below with the lid opened as shown in FIG. To do.

  In order to form the notch recess 32 on the outer peripheral surface of the side peripheral wall 21 of the upper lid B, it is necessary to provide a hanging portion that matches the shape of the notch recess 32 in the upper mold. As shown to (a), the radial width of the notch recess 32 toward the lower end edge 25 on the outer peripheral concave surface 35 of the notch recess 32 of the upper lid B is changed from d at the bottom of the notch recess 32 to the lower end edge 25. Since the inclined surface 36 that is inclined so as to spread to D1 is provided, an inclined surface that coincides with the inclined surface is also formed on the hanging portion of the mold.

When the synthetic resin is injected and filled into the cavity of the mold and the cooling process is completed, when the molded hinge cap is released from the mold, the upper mold having the notch recess 32 is raised and separated. As a result, the inclined surface of the hanging portion plays a role of a drop gradient, and a space is created between the inclined surface 36 of the outer peripheral concave surface 35 and the inclined surface of the hanging portion of the upper mold.
At the same time, the fitting bulging portion 24 provided at the inner peripheral lower portion of the side peripheral wall 21 of the upper lid B protrudes inward, so that the upper mold corresponding to the shape of the fitting bulging portion 24 rises. Accordingly, the fitting bulging portion 24 of the molded hinge cap is pressed by the upper mold, but the outer peripheral side of the side peripheral wall 21 corresponds to the inclined surface 36 between the upper mold. Since the space to be generated is generated, the side peripheral wall 21 is deformed outward, and the pressing force to the fitting bulging portion 24 can be reduced.

For this reason, the hinge cap according to the present embodiment, like the related art hinge cap having the notch recess 32a having no inclined surface as shown in FIG. 100 does not occur.
In this embodiment, as shown in FIG. 4A, the inclined surface 36 starts from the bottom of the notch recess 32 and the entire outer peripheral concave surface 35 is the inclined surface 26, but FIG. If the starting point 37 of the inclined surface 36 is at a position higher than the upper root portion 27 of the fitting bulging portion 24 as in the modified embodiment shown in FIG. The same effect as the example can be expected.

  As described above, the hinge cap of the present embodiment does not cause abnormal deformation such as turn-up in the fitting bulge portion 24 corresponding to the portion where the notch recess 32 is present. Therefore, stable airtightness and fitting strength can be obtained without causing the contents to leak and the fitting strength to weaken and unintentional opening of the lid to occur.

In this embodiment, the hinge cap is molded by injection molding. However, the present invention is not limited to injection molding, and any synthetic resin hinge cap molded using a mold can be applied.
Further, the shape of the hinge cap is not limited to the cap main body A or the like that is attached by the screw 2 as in the present embodiment and includes the extraction cylinder 9 having the constricted portion 11, and an appropriate shape can be adopted. .

  The synthetic resin hinge cap of the present invention has stable airtightness and fitting strength without causing abnormal deformation such as turning over at the fitting bulging portion of the upper lid that engages with the cap body, The present invention can be widely applied to containers that must be surely prevented from leaking, and is particularly suitable as a hinge cap for containers that contain liquid contents.

A Cap body B Top lid C Hinge 1 Container mouth 2 Screw 3 Upper wall 4 Outer cylinder 5 Step part 6, 6a Upper edge 7 Engagement wall 8 Lid engaging part 9 Outlet cylinder 10 Base cylinder 11 Constricted part 12 Mouth cylinder Part 13 Outlet 14 Inner cylinder 15 Seal plate 20 Top wall 21 Side peripheral wall 22 Sealing cylinder 23 Tip fitting part 24, 24a Fitting bulging part 25, 25a Lower edge 26 Picking part 27 Upper root part 30 Central hinge part 31 Both sides Hinge part 32, 32a Notch concave part 33 Intermediate part 34 Reinforcement end part 35, 35a Peripheral concave surface 36 Inclined surface 37 Starting point 100 Who

Claims (2)

In a synthetic resin hinge cap consisting of a cap body attached to the container and an upper lid connected to the cap body via a hinge,
The top lid is composed of a top wall and a side wall suspended from the periphery of the top wall, and an annular fitting bulge that protrudes inward and engages with the cap body is provided at the lower part of the inner peripheral surface of the side wall. And
The hinge connects the cap body and the upper lid over a predetermined range in the circumferential direction near the edge where the outer periphery of the cap body and the upper lid overlap each other, and connects the upper end edge of the cap body and the lower end edge of the upper lid at the center of the predetermined range. A central hinge part, and both side hinge parts provided on both sides of the central hinge part, and connected at positions spaced apart from each other up and down through a notch recess reduced in diameter from the upper edge and the lower edge;
The outer peripheral concave surface that forms the outer peripheral surface of the notched concave portion of the side peripheral wall of the upper lid is provided with an inclined surface that is inclined toward the lower end edge so that the radial width of the notched concave portion is widened. Synthetic resin hinge cap.   2. The synthetic resin hinge cap according to claim 1, wherein the inclined surface is provided from a height position above an upper base portion of the fitting bulge portion to a lower end edge of the upper lid.

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