JP6281029B1 - Synthetic resin caps and containers - Google Patents

Abstract

To provide a cap and container made of a synthetic resin capable of widening the locking margin of the locking piece with respect to the annular protrusion while preventing the reversal of the locking piece, and thus surely breaking the annular weakened portion at the time of opening. . A skirt wall (3) provided with a female screw (5) screwed to a male screw (M1) formed on the outer periphery of the container mouth (M), and an annular weakening portion (10) at the lower part of the skirt wall (3). A tamper-evidence band (9) connected through a ring-shaped projection (on the outer periphery of the container mouth (M) on the inner peripheral side of the tamper-evidence band (9)). M2) is provided with a plurality of locking pieces (11) which can be locked from below at intervals in the circumferential direction, and at least a part of the locking pieces (11) protrudes forward from the tip thereof (12 ) And the projecting portion (12) has the cap (1) attached to the container mouth portion (M) and the tip of the locking piece (11) faces upward. A protruding portion (14) that is close to the outer peripheral side and protrudes to the outer peripheral side of the locking piece (11). It is configured to.

Description

  The present invention relates to a synthetic resin cap that is attached to a mouth portion of a container that contains contents such as beverages, and a container including the same.

  As a cap attached to the mouth of a container for storing contents such as beverages, a cap that can be confirmed at a glance whether or not it is opened is widely used. An example of such a conventional cap is shown in FIGS. 9A and 9B (see Patent Document 1). This cap has a cap body 55 having a skirt wall 54 provided with a female screw 53 that is screwed into the male screw 52 of the container mouth M, and a tamper evidence band connected to the lower portion of the skirt wall 54 via an annular weakening portion 56. 57. On the inner peripheral side of the tamper evidence band 57, a plurality of locking pieces 59 that can be locked from below on annular projections 58 provided on the outer periphery of the container mouth M are provided at intervals in the circumferential direction. At the tip of the piece 59, there is provided a protrusion 60 positioned on the outer peripheral side of the annular protrusion 58 when the cap is attached to the container mouth M.

  If the projecting portion 60 is not provided on the cap, there is a risk that when the upper locking piece 59 is locked to the annular protrusion 58 during opening, the reaction force may cause the reverse to be reversed downward. When such inversion occurs, the locking of the locking piece 59 with respect to the annular protrusion 58 is released, the opening is completed without breaking the annular weakened portion 56, and the opening of the annular weakened portion 56 is determined based on whether or not it is broken. The presence or absence cannot be determined. That is, inversion of the locking piece 59 becomes a problem.

  In this regard, in the cap shown in FIGS. 9A and 9B, the inversion of the locking piece 59 at the time of opening is prevented by the protrusion 60 coming into contact with the annular protrusion 58.

Japanese Patent No. 6061357

  However, in the cap, the protruding portion 60 prevents the locking piece 59 from being inverted as described above, but by providing the protruding portion 60, the locking margin (locking) of the locking piece 59 with respect to the annular protrusion 58 is secured. (Area) will also be reduced. In particular, as described in Patent Document 1, if a gap is made to exist between the protruding portion 60 and the skirt wall 54 in a state where the cap is attached to the container mouth portion M, the locking allowance is narrow. This tendency becomes remarkable. When the locking piece 59 gets over the annular protrusion 58 during opening, the opening is completed without breaking the annular weakening portion 56 due to the lack of the locking allowance.

  The present invention has been made in consideration of the above-mentioned matters. The purpose of the present invention is to widen the locking margin of the locking piece with respect to the annular protrusion while preventing the locking piece from being reversed, and assuredly when opening. An object of the present invention is to provide a synthetic resin cap and container capable of breaking an annular weakened portion.

In order to achieve the above object, a synthetic resin cap according to the present invention comprises a skirt wall provided with a female screw that engages with a male screw formed on the outer periphery of a container mouth portion, and an annular weakening portion at a lower portion of the skirt wall. A tamper-evidence band connected via a hook, and a locking piece that can be locked from below on an annular protrusion provided on the outer periphery of the container mouth on the inner peripheral side of the tamper-evidence band Are provided at intervals in the circumferential direction, and at least a part of the locking piece has a protruding portion protruding forward from the tip thereof, and the cap is attached to the container mouth portion. In the state where the front end of the locking piece is directed upward, the locking piece is configured to have a protruding portion that is close to the outer peripheral side of the locking piece and protrudes to the outer peripheral side of the locking piece, and a base portion of the protruding portion At least A portion extends so as to be positioned closer to the base end side of the locking piece than the tip of the locking piece, and is connected to the locking piece, and the outer peripheral surface of the base portion of the protruding portion is closer to the lower side. The locking piece is approached and the entire base is integrated with the locking piece (Claim 1).

In the synthetic resin cap, the thickness of the protruding portion and the thickness of the protruding portion that does not protrude from the outer peripheral side of the locking piece may be substantially the same (claim 2).

  On the other hand, in order to achieve the above-mentioned object, the synthetic resin cap according to claim 1 or 2 is attached to the mouth of the container according to the present invention (claim 3).

  In the present invention, a cap and container made of a synthetic resin capable of widening the locking margin of the locking piece with respect to the annular protrusion while preventing the reversal of the locking piece, and thus reliably breaking the annular weakened portion when opening the cap. Is obtained.

  That is, in the synthetic resin cap of the invention according to each claim of the present application, by providing the protruding portion, the locking piece can be moved closer to the outer peripheral side. The locking allowance (area to be locked) can be increased effectively, and when the cap is attached to the container mouth, the locking piece is prevented from getting over the annular protrusion when opened, and the ring It is possible to reliably prevent the opening from being completed without breaking the weakened portion.

In the synthetic resin cap according to the first aspect of the present invention, when the protruding portion comes into contact with the annular protrusion from the outer peripheral side, the protruding portion can be prevented from falling to the outer peripheral side due to the reaction, and thus upward. It is also possible to prevent the locking piece projecting from falling greatly (falling down).

It is a perspective view showing roughly the composition of the synthetic resin cap concerning one embodiment of the present invention. It is a longitudinal cross-sectional view which shows schematically the structure of the container which concerns on one embodiment of this invention with which the said synthetic resin cap was mounted | worn with the opening | mouth part. It is a bottom view which shows the structure of the said synthetic resin cap roughly. (A) is explanatory drawing which represents simply the positional relationship of the latching piece and protrusion of the said synthetic resin cap, (B)-(F) is the positional relationship of the latching piece and protrusion which concerns on a modification. FIG. (A) And (B) is the front view and top view which show roughly the structure of the latching piece of the said synthetic resin cap, and a protrusion part. (A) And (B) is the front view and top view which show schematically the structure of the modification of the latching piece of the said synthetic resin cap, and a protrusion part. (A) And (B) is the front view and top view which show roughly the structure of the latching piece of the said synthetic resin cap, and the other modification of a protrusion part. (A) And (B) is the front view and top view which show schematically the structure of the other modification of the latching piece and protrusion part of the said synthetic resin caps. (A) And (B) is explanatory drawing which shows the structure of the conventional synthetic resin caps, and a principal part expanded longitudinal sectional view.

  Embodiments of the present invention will be described below with reference to the drawings.

  A synthetic resin cap (hereinafter referred to as “cap”) 1 shown in FIGS. 1 to 3 is used by being attached to a mouth M (see FIG. 2) of a container such as a plastic bottle, for example, and compression molding or injection. By molding, it is molded integrally with polyethylene. In addition, the raw material which forms the cap 1 is not specifically limited, Polypropylene etc. other than the polyethylene used by this embodiment are used suitably.

  As shown in FIGS. 1 to 3, the cap 1 has a substantially circular top wall 2 in a plan view and a substantially cylindrical skirt wall 3 extending downward from the outer peripheral portion of the top wall 2. Yes. Here, a knurled groove 4 is provided on the outer peripheral surface of the skirt wall 3, and a female screw 5 is provided on the inner peripheral surface. The female screw 5 can be coupled to a male screw M1 formed on the outer periphery of the container mouth.

  Then, when the cap 1 is rotated so that the female screw 5 of the skirt wall 3 is coupled to the male screw M1 of the container mouth part M and attached to the container mouth part M, the annular shape connected to the inner surface (lower surface) of the top wall 2 is provided. The middle leg (inner ring) 6, the annular rib 7 and the annular outer leg (outer ring) 8 are in close contact with the container mouth M, whereby the container mouth M is sealed (see FIG. 2). That is, in a state where the cap 1 is attached to the container mouth portion M, the middle foot 6 is inserted into the container mouth portion M and is in close contact with the inner peripheral surface of the container mouth portion M, and the annular rib 7 is connected to the container mouth portion M. The outer leg 8 is configured to be in close contact with the annular upper end surface, and to be in close contact with the outer peripheral surface of the container mouth portion M. In FIG. 2, in order to easily show the original shape of the midfoot 6, the midfoot 6 and the container mouth M are overlapped. However, in the actual wearing state, the midfoot 6 has a small outer diameter. In this way, it deforms (shrinks) and comes into contact with the inner peripheral surface of the container mouth M.

  The cap 1 is a pilfer-proof cap having a function of proving that it has not been opened (that has never been opened). When the unopened cap 1 attached to the container mouth M is opened (first time) When the cap 1 is rotated so that the coupling between the male screw M1 and the female screw 5 is released, the cap 1 is detached from the container mouth M, but the tamper evidence connected to the lower part of the skirt wall 3 A band (hereinafter simply referred to as “band”) 9 is configured to remain in the container mouth M.

  That is, the band 9 is connected to the lower part of the skirt wall 3 via an annular weakened portion 10 extending over the entire circumference of the skirt wall 3 (see FIGS. 1 and 2). The annular weakened portion 10 is connected to the skirt wall 3. And the band 9 so as to draw up and down, the skirt wall 3 and a slit 9 (perforated) extending intermittently in the circumferential direction of the band 9 and a bridge existing between adjacent slits. Breaks when pulled with a predetermined force.

  In addition, a plurality of locking pieces (flaps) 11 protruding inward are provided on the inner peripheral side of the band 9 (eight in this example) at intervals in the circumferential direction (see FIGS. 1 to 3). ). Each locking piece 11 is positioned substantially below an annular protrusion (bead portion) M2 formed below the male screw M1 on the outer periphery of the container mouth M in a state where the cap 1 is mounted on the container mouth M. Then, it is locked to the annular protrusion M2 by an opening operation (see FIG. 2). That is, the locking piece 11 is configured to be locked to the annular protrusion M2 from below, and when opened, the skirt wall 3 and the top wall 2 above the annular weakening portion 10 are detached from the container mouth M, The band 9 below the annular weakened portion 10 remains in the container mouth M, and the annular weakened portion 10 is broken accordingly.

  Here, the band 9 is integrally formed with the skirt wall 3 and the top wall 2, and the locking piece 11 provided on the band 9 protrudes downward when the cap 1 is formed, but the cap 1 to the container mouth M is projected downward. At the time of mounting, it is pushed up by the annular projection M2 and reversed, and as shown in FIG. 1 and FIG.

  By the way, if the locking piece 11 that protrudes upward is greatly collapsed at the time of opening, the locking piece 11 pressed by the annular protrusion M2 is likely to be re-inverted and protrude downward. The piece 11 does not lock well with the annular protrusion M2. Therefore, in the present embodiment, as shown in FIGS. 1 and 3, at least a part of the locking piece 11 is provided with a protruding portion 12 protruding forward, and a leading end portion of the adjacent locking piece 11. The interlocking portions 13 are connected to each other, and all the locking pieces 11 are connected in an annular shape.

  In the present embodiment configured as above, the fact that the locking piece 11 protruding upward greatly falls (falls down) means that the protrusion 12 contacts the outer peripheral surface of the container mouth M (annular protrusion M2). (See FIG. 2), and thereby, the locking piece 11 is locked to the annular protrusion M2 in a favorable manner. That is, the protrusion 12 is positioned on the outer peripheral side of the annular protrusion M2 in a state where the cap 1 is attached to the container mouth M.

  And in this embodiment, as shown in FIG. 3, the structure except the protrusion part 12 is the same, the protrusion part 12 is provided in each locking piece 11 arrange | positioned at equal intervals in the circumferential direction, and each protrusion part 12 is provided. Is biased.

  Specifically, each locking piece 11 forms a pair only with either one of the adjacent locking pieces 11, and the protrusion 12 provided on the locking piece 11 forming the pair is a pair of locking pieces. 11 is provided at a position facing each other, and is not provided at the opposite position. Specifically, in FIG. 3, when the total eight locking pieces 11 are named 11A to 11H for convenience, for example, there are locking pieces 11B and 11H on both sides of the locking piece 11A. A pair is formed only with the locking piece 11B, and no pair is formed with the locking piece 11H. The protrusions 12 of the locking pieces 11A and 11B are provided at positions facing each other, and the protrusions 12 are provided at positions opposite to the locking pieces 11A and 11B (positions separated from each other). Not.

  That is, the circumferential width of each protrusion 12 is narrower than the circumferential width of each locking piece 11A, 11B. In addition, it is preferable that the circumferential width of the protruding portion 12 is not less than one quarter and not more than two thirds of the circumferential width of the locking piece 11.

  FIG. 3 shows a pair of the locking pieces 11A and 11B, a pair of the locking pieces 11C and 11D, a pair of the locking pieces 11E and 11F, and a pair of the locking pieces 11G and 11H. And are provided.

  When the plurality of projecting portions 12 are intensively arranged as described above, a plurality of regions where the projecting portions 12 do not exist can be intensively provided on the circumference where each locking piece 11 is located. As shown to (A), compared with the case where the protrusion part 60 is provided in the right and left of each locking piece 59, and the case where one protrusion part 12 is provided in the center of each locking piece 11, the area | region where the protrusion part 12 does not exist. Can increase the degree of concentration. Accordingly, in the vicinity of each region where the protruding portion 12 does not exist, the locking margin (the area to be locked) of the locking piece 11 with respect to the annular protrusion M2 can be effectively expanded, and the cap 1 is placed in the container mouth M. In the mounted state, when the plug is opened, it is possible to prevent the locking piece 11 from getting over the annular protrusion M2, and thus it is possible to reliably prevent the opening from being completed without the annular weakened portion 10 being broken. .

  Then, from the viewpoint of increasing the locking allowance or securing a sufficient locking allowance, the central angle α (see FIG. 3) in a plan view of each region where the protruding portion 12 does not exist is 30 ° or more, preferably 45 ° or more. It is desirable that the protrusions 12 are arranged and configured so that

  Further, from the viewpoint of increasing the locking allowance or securing a sufficient locking allowance, if the number of the protruding portions 12 is simply reduced, the effect of preventing the locking pieces 11 from falling down by the protruding portions 12 will be diminished or impaired. In this embodiment, as described above, the protrusions 12 of the locking pieces 11 forming a pair are brought together, and the number of the protrusions 12 is not necessarily reduced. It can also be prevented that the prevention effect is diminished or impaired.

  Further, as shown in FIG. 2, the protruding portion 12 of the present embodiment has an outer peripheral side of the locking piece 1 when the cap 1 is attached to the container mouth M and the tip of the locking piece 11 faces upward. It is configured to have a protruding portion 14 that protrudes toward the outer periphery of the locking piece 11. In the lower circle of FIG. 2, an enlarged longitudinal sectional view of the locking piece 11 having the protrusion 12 is shown.

  The protruding portion 60 of the conventional cap shown in FIG. 9B is close to the outer peripheral side of the locking piece 59, and the protruding portion 12 of this embodiment shown in FIG. However, it is the protrusion part 12 of this embodiment which has the protrusion part 14 which can be brought closer to an outer peripheral side. And in connection with this, in the front-end | tip of the latching piece 11, the part located in the inner peripheral side rather than the protrusion part 12, ie, the latching margin (area to latch) of the latching piece 11 with respect to the cyclic | annular protrusion M2, is effective. Can be spread. Therefore, also from this point, in the state where the cap 1 is mounted on the container mouth portion M, the locking piece 11 is prevented from getting over the annular protrusion M2 when the cap is opened, and the annular weakened portion 10 is not broken. It is possible to reliably prevent the opening from being completed.

  Further, as shown in FIG. 2, at least a part of the base portion 14 a of the protruding portion 14 extends so as to be positioned closer to the proximal end side (lower side in FIG. 2) of the locking piece 11 than the distal end of the locking piece 11. And it is connected to the locking piece 11. And by having comprised the protrusion part 12 in this way, when the protrusion part 12 contacts from the outer peripheral side with respect to the cyclic | annular protrusion M2, it can prevent the protrusion part 12 falling to the outer peripheral side by the reaction. As a result, it is possible to prevent the locking piece 11 protruding upward from falling down (falling down).

  In addition, this invention is not limited to said embodiment at all, Of course, it can change and implement variously in the range which does not deviate from the summary of this invention. For example, the following modifications can be given.

  In the example of FIG. 3, the number of the locking pieces 11 is eight, but is not limited thereto. For example, the number of the locking pieces 11 may be 3 or more and 20 or less. Accordingly, the upper limit of the central angle α can be considered to be 120 ° or less, for example.

  Moreover, in the example of FIG. 3, since there are a total of eight locking pieces 11, that is, a plurality of locking pieces 11, four pairs of the locking pieces 11 can be provided. And the positional relationship of the locking piece 11 and the protrusion part 12 at this time can be represented simply like FIG. 4 (A). However, when there are a plurality of locking pieces 11 and there are six or more, it is not always necessary to create half of the pairs, in other words, all the locking pieces 11 are configured to create pairs. It is not necessary, and at least a part of them may form a pair. For example, a pair that is less than a half of the pair may be created. At this time, the protruding portion 12 may or may not be provided on the locking piece 11 that does not create a pair. When the protruding portion 12 is provided, the protruding portion 12 is provided at the center in the circumferential direction of the locking piece 11. Conceivable.

  Specifically, for example, when the number of the locking pieces 11 is 8, as shown in FIG. 4 (B), three pairs, which is one pair less than half (4 pairs), can be created. In the example of illustration, the protrusion part 12 is not provided in the two locking pieces 11 which do not produce a pair.

  As another example of the case where there are a plurality of locking pieces 11, as in the case where the number of the locking pieces 11 is six, as shown in FIG. As shown in FIG. 4F, two pairs may be used. In the example of FIG. 4 (F), the protrusions 12 are provided on the two locking pieces 11 that do not form a pair.

  Although not shown, when there are four locking pieces 11, from the viewpoint of preventing the locking pieces 11 from falling, there are two pairs (all (four) locking pieces 11 create a pair). Preferably). That is, it is preferable to always provide a plurality of pairs (two or more pairs).

  In addition, there may be an odd number of locking pieces 11. In this case, there are always locking pieces 11 that do not form a pair. In addition, the locking piece 11 that does not create a pair may or may not be provided with the protruding portion 12, and in the case of providing, the protruding portion 12 may be provided at the center in the circumferential direction of the locking piece 11. It is preferable that a plurality of pairs be provided. Therefore, the number of locking pieces 11 is not reduced to three or less.

  When the number of the locking pieces 11 is 5 or 7, as shown in FIGS. 4C and 4D, all the locking pieces 11 except for one locking piece 11 form a pair. It is preferable to do this. That is, FIG. 4C shows the case where the number of the locking pieces 11 is seven, and FIG. 4D shows the case where the number of the locking pieces 11 is five. Although not shown, when the number of the locking pieces 11 is nine or more, it is not always necessary to configure all the locking pieces 11 except for one locking piece 11 to form a pair. For example, three locking pieces You may comprise so that all the latching pieces 11 except 11 may form a pair.

  Although it is preferable to provide only one protruding portion 12 for each locking piece 11, a plurality of protruding portions 12 may be provided. However, also in this case, as described above, the projecting portion 12 has a central angle α (see FIG. 3) in a plan view of each region where the projecting portion 12 does not exist so as to be 30 ° or more, preferably 45 ° or more. It is desirable to arrange and configure.

  In the above embodiment, the two protruding portions 12 of the locking piece 11 forming the pair are separated, but the protruding portions 12 may be connected to each other.

  The method of providing the protrusions 12 is not limited to the above-described examples. For example, as shown in FIGS. 5A and 5B, the protrusions 12 may be provided at the center of the tip of each locking piece 11. .

  In the example of FIG. 2, when the cap 1 is attached to the container mouth M and the tip of the locking piece 11 faces upward, the thickness of the protruding portion 14 that protrudes to the outer peripheral side of the locking piece 11 and the protruding portion 14 are protruded. Although the thickness of the non-existing portion is substantially the same, the thickness ratio can be changed as appropriate.

  Further, as shown in FIGS. 5A and 5B, the protruding portion 14 that protrudes to the outer peripheral side of the locking piece 11 may be provided over the entire locking piece 11. The protruding portion 14 may be provided so as to partially or intermittently correspond to the piece 11, and the protruding portion 14 not only protrudes to the outer peripheral side with respect to the locking piece 11, but also in the circumferential direction or upward direction It may protrude.

  Specifically, for example, as shown in FIGS. 6A and 6B, the protruding portion 14 may be provided intermittently in the circumferential direction. In FIGS. 6A and 6B, the protruding portion 14 is provided in the circumferential direction so as to be divided into three regions. However, the number of the separating portions is not limited to three.

  Further, as shown in FIGS. 7A and 7B, the base portion 14a of the protruding portion 14 may be provided continuously in the circumferential direction, and the upper portion may be provided intermittently in the circumferential direction. Conversely, as shown in FIGS. 8A and 8B, the base portion 14a of the protruding portion 14 may be provided intermittently in the circumferential direction, and the portion above it may be provided continuously in the circumferential direction. 5A, FIG. 6A, FIG. 7A, and FIG. 8A, the cap 1 is attached to the container mouth portion M, and the leading end of the locking piece 11 faces straight up. FIG. 5 (B), FIG. 6 (B), FIG. 7 (B), and FIG. 8 (B) are respectively front views when the locking piece 11 and the protruding portion 12 are viewed from the outer peripheral side. It is a top view at the time.

  Furthermore, the vertical cross-sectional shape (outer peripheral shape) of the base portion 14a connected to the locking piece 11 can be variously modified, and the inclined shape shown in FIG. 2 (the radial width becomes narrower at a constant rate toward the lower side. Shape), stepped shape (shape in which the radial width gradually decreases toward the lower side), curved surface shape (shape in which the radial width decreases at a non-constant ratio toward the lower side), etc. It may be.

  Needless to say, the above modifications may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Cap 2 Top wall 3 Skirt wall 4 Knurled groove 5 Female screw 6 Middle foot 7 Annular rib 8 Outer foot 9 Tamper evidence band 10 Annular weakening part 11 Locking piece 12 Protruding part 13 Overhanging part 14a Base part 52 Male screw 53 Female thread 54 Skirt wall 55 Cap body 56 Annular weakened part 57 Tamper evidence band 58 Annular protrusion 59 Locking piece 60 Projection part M Container mouth part M1 Male thread M2 Annular protrusion α Center angle

Claims (3)

A cap provided with a skirt wall provided with an internal thread that engages with an external thread formed on the outer periphery of the container mouth portion, and a tamper evidence band connected to the lower portion of the skirt wall via an annular weakening portion,
On the inner peripheral side of the tamper evidence band, a plurality of locking pieces that can be locked from below on annular projections provided on the outer periphery of the container mouth portion are provided at intervals in the circumferential direction,
At least a part of the locking piece has a protruding portion that protrudes forward from its tip,
The projecting portion is close to the outer peripheral side of the locking piece and on the outer peripheral side of the locking piece when the cap is attached to the container mouth and the tip of the locking piece faces upward. Configured to have a protruding portion ,
At least a part of the base of the protruding portion extends so as to be positioned closer to the base end side of the locking piece than the tip of the locking piece, and is connected to the locking piece,
A synthetic resin cap characterized in that the outer peripheral surface of the base portion of the protruding portion approaches the locking piece as it goes downward, and the entire base portion is integrated with the locking piece . The synthetic resin cap according to claim 1 , wherein a thickness of the protruding portion is substantially the same as a thickness of a portion of the protruding portion that does not protrude to the outer peripheral side of the locking piece . A container having the synthetic resin cap according to claim 1 or 2 attached to a mouth.