WO2011118551A1 - Synthetic resin pilfer-proof cap - Google Patents

Abstract

A synthetic resin pilfer-proof cap which enables whether the cap has been opened or not to be easily visually confirmed. The front end surface (22) of a flap (16) has formed thereon a sloped surface. In a view of an axial cross-section of a cap body (1) taken so as to include the center axis thereof, the inner angle (a) formed between the sloped surface and the inner surface (25) of the flap (16) in the radial direction is an obtuse angle greater than 90 degrees. When the cap is in a closed state, the flap (16) is in a state in which the flap (16) is in contact at the sloped surface thereof with a protrusion section (52) of the container mouth section (50) and is elastically deformed and pivoted outward in the radial direction about the base end section (16a) as the support point. When a band (3) descends after a bridge (2) is cut, the flap (16) pivots inward in the radial direction due to the elastic restoration force of the flap (16) and interferes with the protrusion section (52) to prevent the band (3) from ascending to the height at which the band (3) is located before the bridge (2) is cut.

Description

Synthetic pill fur proof cap

The present invention relates to an improvement of a synthetic resin pilfer proof cap configured to be attached to a container mouth for sealing and to be cut by opening.

Conventionally, as this type of cap, for example, as shown in FIG. 9, a cap main body 101 screwed into a container mouth portion 50 such as a PET bottle and the lower end of the cap main body 101 are connected via a bridge 102. A synthetic resin cap for PET bottles provided with the band 103 is known (for example, Patent Document 1 below). The band 103 is provided with a flap 116 extending obliquely upward from the lower part thereof. The flap 116 has an annular shape, and its tip is bent in a bellows shape. As shown in an enlarged view in FIG. 10, the flap 116 has an axial sectional view including the center line of the cap body 101. The angle (inner angle α) between the distal end surface 122 and the radially inner surface 125 of the flap 116 is 90 degrees or less than 90 degrees.

Then, the bridge 102 is cut by the flap 116 being locked to the bulging portion 52 (bead) of the container mouth portion 50 at the time of opening. When the bridge 102 is cut, the cap main body 101 and the band 103 are separated, and the cap main body 101 is detached from the container mouth portion 50, while the band 103 remains in the container mouth portion 50 as it is. Thus, since the bridge 102 is cut by opening, it is possible to determine whether the bridge 102 is unopened or unopened depending on whether or not the bridge 102 is cut. Tamper evidence function).

Incidentally, when the bridge 102 is cut, the band 103 is usually lowered to a predetermined position by its own weight as shown in FIG. Therefore, a gap is formed between the cap body 101 and the band 103, and it can be confirmed that the cap has been opened by looking at the gap. However, even if the bridge 102 is cut, the band 103 may not be lowered due to friction or the like. Further, even if the band 103 is lowered to a predetermined position, if the band 103 is intentionally pushed up, as shown in FIG. 12, the band 103 returns to the position before the bridge 102 is cut, that is, the position before opening, and that position. Sometimes stays at. In this way, when the band 103 is present at a position before opening or close to it even though it is already opened, there is almost no gap between the cap body 101 and the band 103. It looks as if it is unopened. That is, at first glance, it becomes difficult to distinguish whether it is already opened or not.

Japanese Patent No. 3256344

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a synthetic resin pilfer-proof cap that allows easy visual confirmation of the presence or absence of opening.

The present invention has been made to solve the above-mentioned problems, and the synthetic resin pill fur proof cap according to the present invention has an annular band connected to the lower end of the cap body attached to the container mouth portion via a bridge. A synthetic resin pilfer is formed such that a flap extending obliquely upward is formed on the inner peripheral surface of the band, and the flap is locked to the bulging portion of the container mouth portion when the cap is opened and the bridge is cut. In the proof cap, the front end surface of the flap is formed with an inclined surface portion having an obtuse angle of more than 90 degrees with respect to the inner surface in the radial direction of the flap in an axial sectional view including the center line of the cap body. In this state, the flap is in an elastically deformed state so as to abut against the bulging portion at the inclined surface portion and to rotate radially outward with the base end portion as a fulcrum. When the band is lowered, the flap is rotated radially inward by the elastic restoring force, and the band is raised to the height before cutting the bridge by the flap interfering with the bulging portion. Features.

In the synthetic resin pilfer proof cap with this structure, even if the band that has been lowered after opening is returned to its original position, the flap interferes with the bulging part of the container mouth and restricts the band from rising. To do. Therefore, the band cannot rise to the original height before opening, and a gap is always formed between the cap body and the band, and it is easily opened by looking at the gap. It can be confirmed that it is in a state.

In particular, it is preferable that the entire front end surface of the flap is the inclined surface portion, and the radially outer edge of the front end of the flap interferes with the bulging portion after the bridge is cut to restrict the rise of the band. By making the entire front end surface of the flap an inclined surface portion, the shape of the flap can be simplified, and the rise of the band can be reliably regulated by the radially outer edge of the front end of the flap.

The front end surface of the flap is divided into a radially inner region and a radially outer region having a larger inner angle than the radially inner region, and the radially outer region contacts the bulging portion as the inclined surface portion, It is preferable that the radially outer edge of the front end of the flap interferes with the bulging portion after the bridge is cut and restricts the rise of the band. By making the inner angle of the radially inner area of the flap relatively small, the flap can be securely locked to the bulging portion when opening, and the band rises by the radially outer edge of the tip of the flap. Can be reliably regulated.

As described above, since the rise of the band to the original height is restricted by the flap after opening, a gap is surely present between the cap body and the band after opening, and the gap is opened by the gap. It can be clearly shown that it has been plugged.

Sectional drawing which shows the synthetic resin pilfer-proof cap in one Embodiment of this invention. The principal part sectional drawing which is a use condition of the same cap, and shows a closure state. The principal part enlarged view of the cap. The principal part sectional drawing which is the use condition of the cap, and shows the state after opening. The principal part sectional drawing which is the use condition of the cap, and shows the state after opening. The principal part sectional drawing which is the use condition of the cap in other embodiment of this invention, Comprising: A plugged state is shown. It is a principal part enlarged view of the cap, (a) is a cross section in a radial direction inner edge, (b) is a cross section in a radial direction outer edge. The principal part sectional drawing which is the use condition of the cap, and shows the state after opening. The principal part sectional drawing which is a use condition of the conventional synthetic resin pilfer-proof caps, and shows a closed state. The principal part enlarged view of the cap. The principal part sectional drawing which is the use condition of the cap, and shows the state after opening. The principal part sectional drawing which is the use condition of the cap, and shows the state after opening.

Hereinafter, a synthetic resin pilfer-proof cap according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. The cap in the present embodiment includes a cap body 1 as shown in FIG. 1, and the cap body 1 is screwed into the container mouth portion 50 as shown in FIG. An annular band 3 is connected to the lower end of the cap body 1 via a plurality of bridges 2. The cap is a so-called two-piece cap, and a packing (not shown) is inserted inside the cap body 1 in order to seal the container opening 50. The cap body 1 and the band 3 are integrally formed by molding (compression molding, injection molding, etc.) from a synthetic resin, and the packing is formed separately from the synthetic resin by molding (compression molding, injection molding, etc.). It is inserted and held inside the cap body 1.

The cap body 1 is composed of a disc-shaped lid top plate 10 and a cylindrical peripheral wall 11 depending from the periphery of the lid top plate 10. The peripheral wall 11 includes a straight portion 12 having a substantially constant diameter, and a large-diameter portion 13 that is connected to the lower side of the straight portion 12. A vertical knurl 14 is formed on the outer peripheral surface of the straight portion 12 over the entire circumference and the entire height. Further, an internal thread portion 15 that is screwed with the external thread portion 51 on the outer peripheral surface of the container mouth portion 50 is formed on the inner peripheral surface of the peripheral wall 11.

The band 3 connected to the lower end of the cap main body 1 has an outer peripheral surface that is continuous with the outer peripheral surface of the large-diameter portion 13 of the cap main body 1 via a boundary line between the cap main body 1 and the band 3. ing. The outer peripheral surface of the band 3 has a larger diameter toward the lower side as a whole. The bridges 2 that connect the cap body 1 and the band 3 are formed at regular intervals in the circumferential direction. The bridges 2 are formed, for example, as follows. That is, a plurality of connecting piece portions 17 are formed at regular intervals in the circumferential direction from the inner peripheral surface of the peripheral wall 11 of the cap body 1 to the inner peripheral surface of the band 3, and on the outer peripheral surface of the portion corresponding to the connecting piece portion 17. The slit 18 is formed by a cutter or the like so as to leave a part of the connecting piece 17, and a part of the remaining connecting piece 17 is configured as the bridge 2. The slit 18 is a boundary line between the cap body 1 and the band 3.

And the flap 16 which latches to the bulging part 52 of the container mouth part 50 is formed in the inner peripheral surface of this band 3 so that the band 3 may remain in the container mouth part 50 at the time of opening. The flap 16 is folded inward from the lower part of the band 3 and extends obliquely upward. The flap 16 is elastically deformable so as to rotate outward in the radial direction (that is, in a direction approaching the inner peripheral surface of the band 3) with the base end portion 16a as a fulcrum by its retained elasticity. Since the flap 16 is formed in an annular shape, the distal end portion thereof can be expanded and contracted with the base end portion 16a as a fulcrum.

Further, the flap 16 is formed in a bellows shape in order to suppress bending at the time of opening. That is, the front end portion of the flap 16 is bent and formed in a dogleg shape toward the inner side in the radial direction, and the bent wall 20 bent in the dogleg shape is continuously formed in the circumferential direction to form a bellows shape. It has become. The bent wall 20 is composed of a pair of left and right triangular walls 20a and 20b located on both sides of a folding line 21 in the vertical direction with the radial inner surface 25 of the flap 16 as a mountain fold. , 20b taper downward. Therefore, the front end surface 22 of the flap 16 is formed by a continuous end surface of the triangular walls 20a and 20b, and has a radially inner bent portion 23 and a radially outer convex shape that bend in a radially convex shape. It is the shape which has the radial direction outer side bending part 24 bent in the shape of a circle alternately in the circumferential direction.

Further, the front end surface 22 of the flap 16 has an inner angle α of 90 degrees with the radially inner surface 25 of the flap 16 in the axial sectional view including the center line of the cap body 1 as shown in FIG. The inclined surface portion has an obtuse angle exceeding. The inner angle α is, for example, 100 to 130 degrees. FIG. 3 is a cross section on the fold line 21 which is the boundary between the both triangular walls 20a and 20b, but the same can be said in other places. The internal angle α between the two points is an axial sectional view including the center line of the cap body 1.

As described above, since the entire distal end surface 22 of the flap 16 is an inclined surface portion, the length from the proximal end portion 16 a to the distal end surface 22 of the flap 16 is determined by the radially inner bent portion 23 and the radially outer bent portion 24. The length from the proximal end portion 16a of the flap 16 to the radially outer bent portion 24 is longer than the length from the proximal end portion 16a of the flap 16 to the radially inner bent portion 23. That is, the length from the base end portion 16 a of the flap 16 to the distal end surface 22 is gradually increased from the radially inner bent portion 23 toward the radially outer bent portion 24.

The cap configured as described above is tightened and attached to the container mouth portion 50. In the process of attaching to the container mouth portion 50, the flap 16 elastically deforms radially outward (in the diameter increasing direction) with the base end portion 16a as a fulcrum and passes outside the bulging portion 52 of the container mouth portion 50. . When the attachment to the container mouth portion 50 is completed, as shown in FIG. 2, the flap 16 is automatically rotated radially inward by its own elastic restoring force, and the front end surface 22 (inclined surface portion) of the flap 16 is rotated. ) Abuts against the peripheral edge of the lower end of the bulging portion 52. In this attached state (closed state), the radially outer bent portion 24 or a portion close to the distal end surface 22 of the flap 16 contacts the bulging portion 52 and is lower than the bulging portion 52 of the container mouth portion 50. The flap 16 does not contact the outer peripheral surface 53 on the side. In the closed state, the front end surface 22 of the flap 16 is inclined downward toward the inside in the radial direction. Therefore, the radially outer edge 27 (the edge in the radially outer bent portion 24) at the tip of the flap 16 is located above the lower peripheral edge of the bulged portion 52 and radially outward. Further, the radially inner edge 26 at the tip of the flap 16 (the edge in the radially inner bent portion 23) does not contact the outer peripheral surface 53 below the bulging portion 52 of the container mouth portion 50, A predetermined gap is formed between them in the radial direction.

Furthermore, since the flap 16 tries to rotate further inward in the radial direction from the state of FIG. 2 by its own elastic restoring force, not only the contact state of the flap 16 with the bulging portion 52 is maintained, The flap 16 is urged downward by the reaction from the bulging portion 52 in combination with the slanting and abutting contact. That is, a biasing force is applied to the band 3 through the flap 16 in the closed state.

Then, when the cap body 1 is rotated at the time of opening the cap, the flap 16 is locked to the bulging portion 52 of the container mouth portion 50 so that the rise of the band 3 is prevented and the bridge 2 is cut. While the cap body 1 is detached from the container mouth part 50 together with the packing 4, the band 3 remains in the container mouth part 50 as it is. When the bridge 2 is cut, the band 3 falls downward due to its own weight as shown in FIG. 4 and comes into contact with the flange 54 located below the bulging portion 52 of the container mouth portion 50 and stops at that position. Further, since the urging force is applied downward to the flap 16 before the bridge 2 is cut, when the bridge 2 is cut, it is surely dropped downward by its own weight and the urging force. When the band 3 falls downward, the flap 16 automatically rotates radially inward by its elastic restoring force. By this turning operation, the radially inner edge 26 at the tip of the flap 16 abuts on the outer peripheral surface 53 below the bulging portion 52 of the container mouth portion 50. Further, the radially outer edge 27 at the tip of the flap 16 is located radially inward from the position before the bridge 2 is cut, and is located radially inward from the lower end peripheral edge of the bulging portion 52. Become.

Therefore, even if the band 3 is pushed up, the radially outer edge 27 at the tip of the flap 16 contacts the bulging portion 52 as shown in FIG. That is, since the radially outer edge 27 at the tip of the flap 16 is at a lower position than before opening, the band 3 cannot return to the original height before opening, and the cap body 1 is placed in the container mouth portion 50. Even if it is screwed back to the original position, a predetermined gap D is reliably formed between the band 3 and the band 3. Therefore, the gap D between the cap body 1 and the band 3 can be easily visually confirmed, and it can be easily determined that the cap has been opened.

In the present embodiment, since the entire front end surface 22 of the flap 16 is the inclined surface portion, the shape of the flap 16 is simple and its manufacturing management is easy. However, the entire front end surface 22 of the flap 16 is the inclined surface portion. The configuration is not limited to this, and it is only necessary that an inclined surface portion is provided on a part of the tip surface 22.

For example, as shown in FIGS. 6 and 7, the front end surface 22 of the flap 16 is divided into a radially inner region 30 and a radially outer region 31, and an inner angle α <b> 2 of the radially outer region 31 is divided into the radially inner region 30. The radially outer region 31 can also be an inclined surface portion, which is larger than the inner angle α1. In this case, for example, the inner angle α1 of the radially inner region 30 is set to 90 degrees, while the inner angle α2 of the radially outer region 31 is set to 110 to 130 degrees, for example, so that the radially outer region 31 is attached to the container mouth portion 50. It can comprise so that the lower end peripheral part of the bulging part 52 may contact | abut.

Even in this configuration, when the bridge 2 is cut by opening and the band 3 is lowered, the band 3 cannot be returned to the original height. That is, as shown in FIG. 8, the radially outer edge 27 at the tip of the flap 16 abuts against the bulging portion 52 and restricts further elevation of the band 3, and accordingly, between the cap body 1 and the band 3. The gap D is reliably formed. Further, even when the radially outer region 31 of the flap 16 is not locked by the bulging portion 52 when the plug is opened, the radially inner region 30 having the relatively small inner angle α1 is surely secured to the bulging portion 52. Therefore, the cutting failure of the bridge 2 can be prevented. The inner angle α1 of the radially inner region 30 may exceed 90 degrees as long as it is smaller than the inner angle α2 of the radially outer region 31.

In the above embodiment, the case where the radially outer edge 27 interferes with the bulging portion 52 has been described. However, the relatively outer portion of the tip of the flap 16 interferes with the bulging portion 52 and the band 3 is raised. You can regulate it.

In addition, although the case where the bent wall 20 is continuously formed in the circumferential direction on the flap 16 has been described, the bent wall 20 may be formed at intervals in the circumferential direction. Further, the flap 16 may be formed in pieces in the circumferential direction instead of being annular. For example, the fragmentary flaps 16 may be formed at intervals in the circumferential direction. In that case, you may form the bending wall 20 in the fragmentary flap 16, respectively.

Furthermore, although the case of a two-piece cap having a separate packing has been described, the present invention can also be applied to a one-piece cap in which an inner ring inserted into the container mouth portion 50 is projected from the lower surface of the lid top plate 10.

DESCRIPTION OF SYMBOLS 1 Cap main body 2 Bridge 3 Band 10 Cover top plate 11 Perimeter wall 12 Straight part 13 Large diameter part 14 Knurl 15 Female thread part 16 Flap 16a Base end part 17 Connection piece part 18 Slit 20 Bending wall 20a Triangular wall 20b Triangular wall 21 Bending line 22 Front end surface 23 Radially inner bent portion 24 Radially outer bent portion 25 Radially inner surface 26 Radially inner edge 27 Radially outer edge 30 Radially inner region 31 Radially outer region 50 Container port portion 51 Male screw portion 52 Swelled portion 53 Outer peripheral surface 54 Flange 101 Cap body 102 Bridge 103 Band 116 Flap 122 Tip surface 125 Radial inner surface α Interior angle α1 Interior angle α2 Interior angle D Gap

Claims (3)

An annular band is connected to the lower end of the cap body attached to the container mouth portion via a bridge, and a flap extending obliquely upward is formed on the inner peripheral surface of the band. In the synthetic resin pilfer proof cap configured to be locked to the protruding portion and the bridge cut,
The front end surface of the flap is formed with an inclined surface portion having an obtuse angle exceeding 90 degrees with respect to the inner surface in the radial direction of the flap in an axial cross-sectional view including the center line of the cap body. When the band is lowered after the bridge is cut, the flap is moved by the elastic restoring force, while being in contact with the bulging portion at the inclined surface portion and elastically deforming so as to rotate radially outward with the base end portion as a fulcrum. A synthetic resin pilfer-proof cap characterized in that the flap is restricted by rotating inward in the radial direction and raising the band to a height before cutting the bridge by the interference of the flap with the bulging portion. 2. The synthetic resin pilfer according to claim 1, wherein the entire front end surface of the flap is the inclined surface portion, and the radially outer edge of the front end of the flap interferes with the bulging portion after the bridge is cut to restrict the rise of the band. Proof cap. The front end surface of the flap is divided into a radially inner region and a radially outer region having a larger inner angle than the radially inner region, and the radially outer region contacts the bulging portion as the inclined surface portion. The synthetic resin pilfer-proof cap according to claim 1, wherein a radially outer edge of a distal end interferes with the bulging portion after the bridge is cut and restricts the rise of the band.

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