JP2006213353A - Cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap capable of suppressing breakage of a bridge in a hemming process. <P>SOLUTION: The cap 10 comprises a top plate part 11 and a peripheral wall part 12 which is substantially suspended from a peripheral edge of the top plate part 11. An easily breakable part 17 having a plurality of peripherally extending slit parts 17a in the peripheral direction via a bridge 17b is provided on the peripheral wall part 12. A first bead part 16a is continuously provided on an upper end of the easily breakable part 17, and a second bead part 16b is continuously provided on a lower end of the easily breakable part 17. The first and second bead parts 16a and 16b have bead swollen parts 16c and 16d which are swollen outwardly in the radial direction and extending in the peripheral direction. At least one of the first and second bead swollen parts 16c and 16d is formed intermittently so as to avoid the position corresponding to the bridge 17b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cap that is screwed onto a cap portion of a bottle can.

  2. Description of the Related Art Conventionally, as a container for filling and sealing beverages for sale, for example, as shown in Patent Document 1 below, a bottle can with a cap in which a cap is screwed onto a base portion of a bottle can has been adopted. As shown in FIG. 3, a cap provided for this kind of bottled can with a cap is generally provided with a top plate portion 11 and a peripheral wall portion 112 substantially hanging from the peripheral edge portion of the top plate portion 11. The peripheral wall portion 112 is provided with an easily breakable portion 117 in which a plurality of slit portions 17a extending in the circumferential direction are formed in the circumferential direction via bridges 117b.

  Further, a first bead portion 116 a is connected to the upper end of the easy break portion 117, and a second bead portion 116 b is connected to the lower end of the easy break portion 117. Each of the first and second bead portions 116a and 116b is configured by bead bulge portions 116a and 116b that bulge outward in the radial direction and extend over the entire circumference in the circumferential direction. The bead bulging portion 116a of the first bead portion 116a is referred to as a “first bead bulging portion 116a” and the bead bulging portion of the second bead portion 116b. 116b is referred to as “second bead bulging portion 116b”).

  In general, this type of cap 100 is formed by punching a rolled material made of an aluminum alloy or the like to form a cup-shaped cap body, and then using a cap-forming tool, It is formed by performing a molding process over the circumference.

After the cap 100 configured as described above is arranged in the cap portion of the bottle can, the peripheral portion of the top plate portion 11 is pressed downward in the can axis direction to form a step portion (step portion forming step). Then, in a state where this pressing is maintained, the outer peripheral surface of the female screw formation scheduled portion 15 is pressed radially inward along the male screw portion of the base portion to form the female screw portion (female screw). Part forming step), and the open end portion (flare) 18 of the peripheral wall portion 112 is radially inward so as to be wound around the bulging portion that is connected to the lower end in the can axis direction of the male screw portion and bulges radially outward. By pressing toward the direction (hem winding process), it is screwed onto the bottle can base.
JP 2003-072798 A

  By the way, in the conventional cap 100, as described above, the first and second bead portions 116a and 116b are connected to each other via the bridge 117b. Therefore, as shown in FIG. Both end portions in the axial direction of 100 are curved or inclined so as to constitute respective end portions on the bridge 117b side of the first and second bead portions 116a and 116b having convex curved surfaces. Therefore, the following problems have occurred.

  That is, when the skirt winding process is performed in a state where the peripheral edge of the top plate portion 11 is pressed downward in the can axis direction due to the shape variation of the bulging portion in the bottle can base portion, the peripheral wall portion 112 Depending on the position in the circumferential direction, there may be a portion that is pulled in the can axis direction and a portion that is compressed. Of these, the bridge 117b located particularly in the portion to be compressed has not only the compressive load in the can axis direction, but also the first bead portion 116a side as shown in FIG. In some cases, the bending moment M with the end portion of the bridge as a fulcrum may also act, and the bridge 117b may easily break during the skirt winding process.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a cap capable of suppressing the breakage of the bridge during the skirt winding process.

  In order to solve such problems and achieve the above object, the cap of the present invention includes a top plate portion and a peripheral wall portion substantially hanging from the peripheral edge portion of the top plate portion, and the peripheral wall The portion is provided with an easily breakable portion in which a plurality of slit portions extending in the circumferential direction are formed in the circumferential direction via a bridge, and a first bead portion is continuously provided at an upper end of the easily breakable portion, and the easy breakage A second bead portion is continuously provided at a lower end of the portion, and each of the first and second bead portions is a cap provided with a bead bulging portion that bulges radially outward and extends in the circumferential direction, At least one of the bead bulging portions of the first and second bead portions is intermittently formed so as to avoid a position corresponding to the bridge.

  According to the present invention, at least one of the bead bulging portions of the first and second bead portions is intermittently formed so as to avoid a position corresponding to the bridge. It is possible to minimize the inclination angle of the bridge with respect to. Thereby, in the case where the portion where the compressive load in the can axis direction acts on the open end portion of the peripheral wall portion when the skirt winding process is performed in a state where the peripheral portion of the top plate portion is pressed downward in the can axis direction, However, it becomes possible to suppress the bending moment generated in the bridge located in this portion to a minimum, and it is possible to suppress the bridge from being broken during the skirt winding process.

Here, the amount of bulging outward in the radial direction of the bead bulge portion in the first bead portion is larger than the bead bulge portion in the second bead portion, and at least the bead bulge in the first bead portion. The part is preferably formed intermittently so as to avoid a position corresponding to the bridge.
In this case, since at least the bead bulging portion of the first bead portion is intermittently formed so as to avoid the position corresponding to the bridge, it is ensured that the inclination angle of the bridge is minimized. Can be realized. Moreover, since the bulge amount of the bead bulge portion in the first bead portion is increased, in the female screw portion forming step, the outer peripheral surface of the peripheral wall portion is opened from the top plate portion side to the peripheral wall portion. It is possible to avoid the threading roller that moves toward the end side and presses radially inward over the first bead portion to break the bridge.

  According to this invention, it is possible to prevent the bridge from being broken during the tail winding process.

  1 and 2 show an embodiment of the present invention. The cap 10 of the present embodiment is formed of, for example, an aluminum alloy or the like. As shown in FIG. 1, the top plate portion 11, the peripheral wall portion 12 substantially hanging from the peripheral edge portion of the top plate portion 11, and the top plate A liner 19 disposed inside the portion 11 is provided.

  A plurality of recesses that are recessed radially inward are formed in the peripheral wall portion 12 at intervals in the circumferential direction, and a knurled portion 13 that constitutes the upper end portion of the peripheral wall portion 12, A groove 14 continuously provided at the lower end (open end side of the peripheral wall portion 12) and having a diameter smaller than that of the knurled portion 13, a smooth surface having a diameter larger than that of the groove 14 and continuous with the lower end of the groove 14; The female thread formation scheduled portion 15, the first bead portion 16 a that is connected to the lower end of the female screw formation planned portion 15 and bulges outward in the radial direction, and the lower end of the first bead portion 16 a, A slit portion 17a extending in the circumferential direction is provided with a plurality of easily breakable portions 17 formed in the circumferential direction via a bridge 17b, and a second portion bulging outward in the radial direction while being connected to the lower end of the easily breakable portion 17 Below the bead portion 16b and the second bead portion 16b To be provided continuously, and flare 18 is a smooth surface forming the open end of the peripheral wall portion 12 is provided.

  Here, the slit portion 17a of the present embodiment is a concave portion having a rectangular shape in a side view in which two long sides extend in the circumferential direction, and a circumferential wall on the long side located on the top plate portion 11 side. A cut (slit) penetrating in the thickness direction of the portion 12 is provided. The first and second bead portions 16a and 16b are formed on the inner peripheral surface of the peripheral wall portion of the cup-shaped cap body formed by punching the rolled material, etc. It is formed by pressing outward in the radial direction.

  As shown in FIG. 1, the first and second bead portions 16a and 16b of the present embodiment respectively include bead bulge portions 16c and 16d that bulge outward in the radial direction and extend in the circumferential direction. (Hereinafter, the bead bulging portion 16c of the first bead portion 16a is referred to as "first bead bulging portion 16c", and the bead bulging portion 16d of the second bead portion 16b is referred to as "second bead bulging portion 16d"). . Further, at least one of the first and second bead bulging portions 16c and 16d is intermittently formed so as to avoid a position corresponding to the bridge 17b.

In the present embodiment, the amount of bulging outward of the first bead bulging portion 16c in the radial direction is larger than that of the second bead bulging portion 16d. Further, both the first and second bead bulging portions 16c and 16d are intermittently formed. That is, the first and second bead portions 16a and 16b are each formed with a plurality of first and second bead bulging portions 16c and 16d in the circumferential direction via the unprocessed portions 16e and 16f having smooth surfaces. It is configured.
As described above, the internal thread formation scheduled portion 15, the unprocessed portion 16e of the first bead portion 16a, the bridge 17b, the unprocessed portion 16f of the second bead portion 16b, and the flare 18 are smoothly connected without any step. Thus, the bridge 17b is configured to extend substantially parallel to the direction in which the axis of the cap 10 extends.

As shown in FIG. 2, the cap 10 configured in this manner is arranged so that the lower surface of the liner 19 comes into contact with the opening end surface (upper end surface) of the bottle can base 21, and then the peripheral edge of the top plate 11. When the portion is pressed downward in the can axis direction to form the stepped portion 11a, the lower surface of the liner 19 is brought into close contact with the curled portion 21a of the bottle can base 21 (stepped portion forming step). And in the state which maintained the said press, it is screwed together with the external thread part 21b by pressing the outer peripheral surface of the internal thread formation plan part 15 toward radial inner direction so that the external thread part 21b of the nozzle | cap | die part 21 may be followed. An outer peripheral surface of the flare 18 is formed along the bulging portion 21c that is formed continuously with the lower end in the can axis direction of the bottle can male screw portion 21 and bulges radially outward. Is pressed inward in the radial direction to cause the flare 18 to be caught in the bulging portion 21c (hem winding process).
The bottle can 22 with a cap is obtained by the above.

  When opening such a bottle can 22 with a cap, the cap 10 is rotated around the can axis in a direction in which the female screw portion 15a is loosened with respect to the bottle can male screw portion 21b. 10 is moved upward in the can axis direction with respect to the bottle can base 21. At this time, since the flare 18 is caught in the bulging portion 21c, the movement of the flare 18 side of the cap 10 is prevented, and the bridge 17b is broken at the initial stage of the movement, so that the easily breakable portion The cap upper part on the top plate part 11 side than 17 is removed from the base part 21, and the cap lower part on the flare 18 side than the breakable part 17 remains in the base part 21.

  As described above, according to the cap 10 according to the present embodiment, both the first and second bead bulging portions 16c and 16d are formed intermittently so as to avoid the position corresponding to the bridge 17b. Therefore, the inclination angle of the bridge 17b with respect to the axis of the cap 10 can be minimized. Thereby, when the skirt winding process is performed in a state where the peripheral edge of the top plate portion 11 is pressed downward in the can axis direction, a portion in which a compressive load in the can axis direction acts on the open end portion (flare 18) of the peripheral wall portion 12 Even in the case of the occurrence of the bending, it is possible to minimize the bending moment generated in the bridge 17b located in this portion, and it is possible to prevent the bridge 17b from being broken during the tail winding process.

  In particular, in the present embodiment, since the bulge amount of the first bead bulge portion 16c is larger than that of the second bead bulge portion 16d, the outer peripheral surface of the female screw formation scheduled portion 15 is formed in the female screw portion formation step. The threading roller that presses radially inward while moving from the top plate portion 11 side to the flare 18 side of the peripheral wall portion 12 avoids getting over the first bead portion 16a and breaking the bridge 17b. It becomes possible to do.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the first and second bead bulging portions 16c and 16d are both intermittently formed. However, only one of the first and second bead bulging portions 16c and 16d may be intermittently formed. . In this case, it is desirable that the first bead bulging portion 16c having a large bulging amount is intermittently formed.

Further, the slit portion 17a of the embodiment is a concave portion having a rectangular shape in a side view in which two long sides extend in the circumferential direction, and a peripheral wall portion on the long side located on the top plate portion 11 side. 12 cuts (slits) penetrating in the thickness direction are made, but the cuts may be made in the long side located on the flare 18 side.
Further, in the above-described embodiment, the bulge amount is larger in the first bead bulge portion 16c than in the second bead bulge portion 16d, but may be the same, or the second bead bulge portion 16d may be the same. You may make the direction larger than the 1st bead bulging part 16c.

  Provided is a cap capable of suppressing breakage of a bridge during a skirt winding process.

It is a half sectional view of a cap shown as one embodiment concerning the present invention. It is the schematic which shows the bottle can with a cap which screwed the cap shown in FIG. 1 on the nozzle | cap | die part of a bottle can. It is a half sectional view of a cap shown as a conventional example according to the present invention. FIG. 4 is a cross-sectional view of the cap shown in FIG. 3 taken along line XX.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cap 11 Top plate part 12 Peripheral wall part 16a 1st bead part 16b 2nd bead part 16c 1st bead bulging part 16d 2nd bead bulging part 17 Easy breakable part 17a Slit part 17b Bridge

Claims (2)

A top plate part and a peripheral wall part substantially hanging from the peripheral part of the top plate part are provided, and a plurality of slit parts extending in the peripheral direction are formed in the peripheral wall part in the peripheral direction via a bridge. An easy portion is provided, and a first bead portion is continuously provided at the upper end of the easily breakable portion, and a second bead portion is continuously provided at the lower end of the easily breakable portion, and the first and second bead portions are Each of the caps swells radially outward and has a bead bulge extending in the circumferential direction,
At least one of the bead bulging portions of the first and second bead portions is intermittently formed so as to avoid a position corresponding to the bridge. The cap according to claim 1, wherein
The bulge amount of the bead bulge portion in the first bead portion in the radially outward direction is larger than the bead bulge portion in the second bead portion, and at least the bead bulge portion in the first bead portion is A cap formed intermittently so as to avoid a position corresponding to the bridge.

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