JP4827038B2 - Cap unit - Google Patents

Description

  The present invention relates to a cap unit attached to a can mouth such as a petroleum can or a paint can, and is particularly suitable for a cap unit in which a synthetic resin packing is accommodated in a cap with an elastic stopper piece.

  As a conventional cap unit, as shown in Japanese Utility Model Laid-Open No. 61-69056 (Patent Document 1), a metal elastic member having an upper wall that can be moved in and out and a side wall formed by a large number of elastic locking pieces. Some caps with a retaining piece accommodate a synthetic resin packing in which a packing body, a peripheral edge portion and a packing collar portion are integrally formed by injection molding.

  When the cap unit is capped, the lower end of the elastic anchoring piece of the cap with the elastic anchoring piece is placed in direct contact with the upper end arc portion of the can mouth, and the upper surface of the cap unit is pressed to be elastic. After the lower end of the stopper piece is lowered while spreading along the upper end arc part of the can mouth, the lower end of the elastic stopper piece enters the side wall recess of the can mouth and is locked.

  However, according to the cap unit of Patent Document 1, the lower end of the elastic hooking piece of the cap with the elastic hooking piece is placed in direct contact with the upper arc portion of the can mouth at the time of capping. For this reason, when the center of the can mouth and the center of the cap unit are placed largely deviated from each other, the lower end of the elastic stopper piece is brought into contact with a portion where the inclination angle of the upper end arc portion of the can mouth is gentle. As a result, the force pressed from the upper surface of the cap unit acts as a force for bending the elastic tacking piece, which may cause a claw breaking phenomenon of the elastic tacking piece. Further, the cap unit of Patent Document 1 may damage the surface of the can mouth, the finger, or the like with the sharp lower end of the metal elastic locking piece.

Therefore, what is disclosed in Japanese Patent Application Laid-Open No. 2004-323106 (Patent Document 2) has been devised. In this patent document 2, the packing body and the outer periphery of the packing body are removed from the outer periphery of the packing body by injection molding in a cap with a metal elastic fastening piece having a top wall that can be moved in and out and a side wall formed by a number of elastic fastening pieces. A cap unit containing a synthetic resin packing formed integrally with a circumferentially extending peripheral part for a can mouth abutting and a packing collar part extending outward from the outer periphery of the peripheral edge part, and extending downward from the packing collar part Then, a packing guide portion locked to the lower end of the elastic locking piece is provided. The packing guide portion includes a hanging portion extending downward from the packing collar portion, an outer portion extending outward from the lower end of the hanging portion, and an outer locking portion extending upward from the outer portion, The hanging portion, the outer portion, and the outer locking portion are locked so as to cover the lower end of the elastic locking piece.
Japanese Utility Model Publication No. 61-69056 JP 2004-323106 A

  The cap unit of Patent Document 2 is used so that the cap with the elastic stopper piece is closed and is attached to the can mouth to keep the inside of the can airtight. However, since the packing is made of synthetic resin, When you open and remove the cap with elastic stopper piece from the can mouth, the packing may remain in the can mouth. In this case, after removing the packing from the can mouth and taking out the contents, the packing is returned to the cap with the elastic stopper piece in the opened state, the cap with the elastic stopper piece is closed, and the cap unit is formed again. Fit in the can mouth. When closing the cap with the elastic locking piece, the outer locking portion of the packing guide portion enters the lower end inside the elastic locking piece, and the packing guide portion cannot be mounted so as to cover the lower end of the elastic locking piece. Therefore, there is a possibility that the function of the packing guide portion cannot be sufficiently exhibited.

  The object of the present invention is to prevent the claw breakage of the elastic tacking piece when capping to the can mouth, and to prevent the can mouth and fingers from being damaged by the lower end of the elastic tacking piece, and again the cap unit It is to provide a cap unit that can reliably cover the lower end of the elastic locking piece with the packing guide portion.

In order to achieve the above-mentioned object, the present invention provides a cap with a metal elastic locking piece having a retractable upper wall and a side wall formed of a large number of elastic locking pieces, a packing body, and an outer periphery of the packing body. Synthetic resin integrally formed by injection molding with a peripheral edge portion for contact with the can mouth extending outward, a packing collar portion extending outward from the outer periphery of the peripheral edge portion, and a packing guide portion extending downward from the packing collar portion A packing made of synthetic resin and a sealing member made of a synthetic resin containing the elastic stopper piece cap. The packing guide portion extends downward from the packing flange portion, and extends outward from the lower end of the hanging portion. An outer locking portion extending upward from the outer portion, and the packing body, the peripheral edge portion, and the packing collar portion are each provided with a cap with an elastic retaining piece. While being housed within, in the packing guide portion, the hanging portion, the outer portion and the outer locking portion by Ri Na locked so as to cover the lower end of the elastic鉤止piece, the sealing member in the cap unit Ru provided with a circular annular upper wall and a cylindrical side wall which is integrally molded by injection molding, provided with a packing protrusion extending outwardly from the outer locking portion of the packing guide, the outer diameter of the packing protrusion A side wall main body that is larger than the inner diameter of the lower end of the elastic locking piece in an open state, and the side wall of the sealing member extends substantially vertically from the upper wall of the sealing member; a convex portion which the inner protruding circumferentially of the lower end portion of the side wall main body portion, be provided with a protection wall covering the distal end portion of the packing guide protrusion from the lower surface of the lower end portion of the side wall main body portion protrudes downward A.

  According to such a cap unit of the present invention, the claw breakage phenomenon of the elastic tacking piece when capping to the can mouth can be prevented, and the can mouth, fingers, etc. due to the lower end of the elastic tacking piece can be prevented from being damaged. When the cap unit is made again, the packing guide portion can reliably cover the lower end of the elastic locking piece.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  First, the overall configuration of the cap unit 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of a cap unit according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the cap unit shown in FIG.

  As shown in FIG. 1, the cap unit 1 is configured by housing a synthetic resin packing 10 in a cap 40 with a metal elastic stopper piece such as tinplate. In this embodiment, the elastic tacking piece cap 40 is further accommodated in the sealing member 20, and the cap unit 1 is constituted by the elastic tacking piece cap 40, the packing 10 and the sealing member 20.

  As shown in FIG. 2, the cap unit 1 is used so as to be attached to the can mouth 30 and keep airtight in the can. A can mouth 30 forming a part of a 4 liter can or an 18 liter can has an upper end arc portion 31 that forms an inlet / outlet for contents and a side wall recess 32 that locks the lower end of the elastic tacking piece 42. Configured.

  As shown in FIG. 1 and FIG. 2, the metal elastic cap with cap 40 has an upper wall 41 that can be moved in and out and an elastic pawl 42 that can be opened and closed. A plurality of elastic locking pieces 42 are provided at equal intervals.

  As shown in FIGS. 1 and 2, the synthetic resin packing 10 such as polyethylene having elasticity has a packing body 11, a peripheral edge portion 12, a packing collar portion 13, a packing guide portion 14, and a packing protrusion portion 15 that are integrally injected. Molding.

  Next, the packing 10 will be described with reference to FIGS. 3 is a front view of the packing used in the cap unit of FIG. 1, FIG. 4 is a plan view of the packing of FIG. 3, and FIG. 5 is a cross-sectional view taken along line AA of FIG.

  The packing body 11 is configured by forming a ring-shaped protrusion 11b at the center of the flat portion 11a. The ring-shaped protruding portion 11b supplements the strength of the thin flat portion 11a, and has sufficient strength as the packing body 11. In particular, since the ring-shaped protruding portion 11b protrudes with substantially the same thickness as the flat portion 11a, the material cost can be reduced as compared with the case where only the upper surface protrudes and the pressure in the can increases. Thus, the outer inclined portion of the ring-shaped protruding portion 11b acts to push the outer peripheral portion of the flat portion 11a outward. By this flat portion 11a pushed outward, the conical expansion portion 12a is strongly pushed by the can mouth 30, and has a function of enhancing the airtight function against an increase in can internal pressure.

  The peripheral portion 12 includes a conical widening portion 12a, an inner protruding ridge portion 12b, an outer protruding ridge portion 12c, a thick portion 12d, and an outer standing portion 12e.

  The conical expansion part 12a continuously extends from the outermost peripheral part of the flat part 11a to the outer periphery over the entire periphery, and is in contact with the can mouth 30 in the mounted state. That is, the outer surface of the conical expanded portion 12 a is in contact with the upper end arc portion 31 of the can mouth 30 obliquely.

  The inner protruding peak portion 12b is formed continuously from the upper end portion of the conical expansion portion 12a, and is formed so as to protrude upward over the entire circumference. The inner protruding ridge portion 12b is not in contact with the upper wall 41 of the elastic locking piece cap 40 in a normal mounting state, and a strong force is applied from above the elastic locking piece cap 40 to form the elastic locking piece. When the cap 40 sinks, the action of contacting the upper wall 41 and sinking is mitigated.

  The outer protruding ridge 12c is continuously formed outward from the outer peripheral side surface of the inner protruding ridge 12b, and is formed to protrude upward over the entire periphery. The outer protruding peak 12c is brought into contact with the upper wall 41 of the elastic locking piece cap 40 in the mounted state.

  The thick portion 12d is formed continuously from the lower surface of the outer protruding ridge portion 12b and the lower surface of the outer protruding ridge portion 12c, and forms a thick portion extending downward over the entire circumference. The thick portion 12d has a gap with the conical widening portion 12a, and is not in contact with the upper end arc portion 31 of the can mouth 30 in a normal mounting state. When a strong impact force is applied, it can contact the upper end arc portion 31 and receive the impact force, thereby keeping the airtightness.

  The outer standing part 12e is formed continuously outward from the lower surface of the outer peripheral part of the thick part 12d, and comes into contact with the upper arc part 31 of the can mouth 30 in the mounted state. The conical expanded portion 12a and the outer vertical portion 12e are opposed to the upper end arc portion 31 in an inverted V shape, and are in contact with each other at two locations inside and outside the upper end arc portion 31 so as to maintain airtightness. . Further, the outer projecting mountain portion 12 c and the outer standing lower portion 12 e are in contact with the upper wall 41 and the upper end arc portion 31 so as to keep the airtightness between the upper wall 41 and the upper end arc portion 31.

  The packing collar portion 13 is formed to continuously extend from the outer peripheral side surface of the thick portion 12d of the peripheral edge portion 12 in an arc shape outward and downward. The outer diameter of the packing collar 13 is set to be slightly larger than the maximum inner diameter in a state where the elastic retaining piece 42 is expanded. As shown in FIG. 1, the packing collar 13 is deformed inward in a state in which the packing collar 13 is attached to the cap 40 with the elastic retaining piece, and acts to push the thick part 12 d inward. As a result, the thick portion 12d having a gap with the conical expanded portion 12a is deformed inward and presses the outer standing portion 12e inward so as to maintain airtightness with the upper arc portion 31. Function.

  The packing guide portion 14 extends downward from the packing collar 13 and is locked to the lower end of the elastic tacking piece 42. Thereby, it is possible to prevent the can mouth 30 or the finger from being damaged by the lower end of the elastic tacking piece 42. The packing guide portion 14 includes a hanging portion 14a extending downward from the packing collar portion 13, an outer portion 14b extending outward from the lower end of the hanging portion 14a, and an outer locking portion 14c extending upward from the outer portion 14b. It is prepared for. The packing 10 is attached to the elastic hooking piece cap 40 so as to cover the lower end of the elastic hooking piece 42 by the hanging part 14a, the outer part 14b, and the outer locking part 14c. Thereby, it is possible to more reliably prevent the packing guide portion 14 from being securely locked to the elastic tacking piece 42 and damaging the can mouth 30 or the finger by the lower end of the elastic tacking piece 42.

  The hanging portion 14 a is formed so as to be gradually thinner than the thickness of the packing collar portion 13. As a result, the drooping portion 14a is deformed so as to be surely along the inner surface of the elastic tacking piece 42, and is thinly interposed between the elastic tacking piece 42 and the side wall recess 32 at the time of mounting. It is possible to apply the packing 10 of the present embodiment without changing the shapes, dimensions, and the like of the cap 40 with elastic stopper pieces and the can mouth 30.

  As shown in FIG. 1, the outer portion 14 b forms an inclined surface that is lowered downward in a state where it is locked to the elastic locking piece 42, and the lower surface 14 b is attached to the upper end arc portion 31 of the can mouth 30. The parts are brought into contact with each other at an inclination, and the function of guiding the packing guide part 14 (in other words, the elastic tacking piece 42) along the arc surface of the upper end arc part 31 is exhibited. This guide function and the elasticity of the packing guide portion 14 itself can prevent the elastic tacking piece 42 from breaking. The inclined surface of the outer portion 14b may be formed in an arc shape.

  The outer locking portion 14 c is locked to the outer surface of the lower end of the elastic tacking piece 42 and functions to prevent the packing guide portion 14 from coming off the elastic tacking piece 42. The outer portion 14b and the outer locking portion 14c are set to have a thickness and dimensions so as not to hinder the mounting of the sealing member 20.

  The packing protrusion 15 includes an outer protrusion 15a that extends outward from the outer locking portion 14c of the packing guide portion 14, and an upper protrusion 15b that protrudes upward from the outer peripheral end of the outer protrusion 15a. It is prepared for. The height dimension (thickness dimension) of the outward protruding portion 15a is the same as the height dimension of the outer locking portion 14c, and the upper surface of the outer locking portion 14c and the upper surface of the outward protruding portion 15a are continuous. Form the same surface. The outer diameter of the packing protrusion 15 is larger than the inner diameter of the lower end of the elastic tacking piece 42 in a state where the elastic tacking piece 42 is open.

  The packing guide part 14 and the packing protrusion part 15 are formed with a number of grooves 16 over the entire circumference. With this groove 16, the packing guide portion 14 can be easily attached to the lower end of the elastic locking piece 42. The intervals between the grooves 16 are formed larger than the intervals between the gaps forming the elastic locking pieces 42. As a result, the lower end of the elastic locking piece 42 can be reliably covered and protected.

  As shown in FIGS. 1 and 2, the packing 10 includes a packing main body 11, a peripheral edge portion 12, a packing collar portion 13, and a hanging portion 14 a of the packing guide portion 14 that are accommodated in an elastic tacking piece cap 40. 14 is formed as a cap unit with the elastic locking piece cap 40 so that the outer portion 14b, the outer locking portion 14c, and the packing protruding portion 15 are exposed to the outside of the elastic locking piece cap 40.

  The synthetic resin sealing member 20 is manufactured by injection molding using a material having elasticity such as polyethylene, and an annular upper wall 21 and a cylindrical side wall 22 are integrally formed.

  The upper wall 21 of the sealing member 20 has a circular space 21a at the center, and a ring-shaped knob 21b is formed along the circular space 21a. The side wall 22 of the sealing member 20 includes a side wall main body portion 22a, a convex portion 22b, and a protective wall 22c.

  The side wall main body portion 22a extends from the upper wall 21 so as to fall almost vertically. The convex portion 22b is formed to project inwardly on the inner periphery of the lower end portion of the side wall main body portion 22a. The protective wall 22 c is formed so as to protrude downward from the lower surface of the lower end portion of the side wall main body portion 22 a and cover the upper protruding portion 15 b that is the tip portion of the packing protruding portion 15.

  The height dimension of the cap unit 1 including the sealing member 20 is set to be substantially the same as the height dimension of the cap unit that has been widely used conventionally. In other words, the lower end of the convex portion 22b of this embodiment is slightly higher than the lower end of the conventional convex portion, and the lower end of the protective wall 22c of this embodiment is the same as the lower end of the conventional convex portion. Thereby, the cap unit supply machine which has been widely used for the cap unit 1 of the present embodiment can be used.

  Next, a method for manufacturing the cap unit 1 and a method for capping the cap unit 1 into the can mouth 30 will be described.

  First, the packing 10 is inserted into the cap 40 with the elastic locking piece in the expanded state, and the cap 40 with the elastic locking piece is closed. The closed cap 40 with the elastic locking piece is inserted into the sealing member 20 using the elasticity of the convex portion 22b to form the cap unit 1 shown in FIG. Thus, the cap unit 1 is formed in order to facilitate the transportation and supply operation to the can mouth.

  After filling the can with contents such as oil and paint, the cap unit 1 is automatically supplied up to the top of the can mouth 30 by the cap unit supply device. At this time, since the packing guide portion 14 is formed with a thin wall, the cap unit 1 can be automatically supplied without substantially changing the existing cap unit supply device.

  Next, the cap unit 1 is lowered by the capping device and placed on the can mouth 30. At this time, it is desirable to place the center of the can 30 and the center of the cap unit 1 as closely as possible, but the center axis of the placed cap unit 1 and the upper end arc portion 31 of the can 30. There is a case where the center axis of the lens is greatly deviated.

  Further, the capping device is lowered and the upper surface of the cap unit 1 (specifically, the upper surface of the upper wall 21 of the sealing member 20) is pressed to lower the cap unit 1. At this time, since the packing guide portion 14 operates so as to contact the upper end arc portion 31 and have a guide function, the cap unit 1 can be lowered smoothly. When the cap unit 1 is further lowered, the lower end of the elastic retaining piece 42 is lowered while being expanded along the inclined surface of the upper end arc portion 31 to the upper end arc portion 31 via the packing guide portion 14, and is moved to the side wall recess 32. The capping is completed by being locked. Thus, since the elastic tacking piece 42 is mounted without capping the upper end arc portion 31 directly at the time of capping, the can mouth 30 is not damaged at the lower end of the elastic tacking piece 42.

  At the time of this capping, even when the center of the can mouth 30 and the center of the cap unit 1 are greatly decentered, the lower end of the outer portion 14b is in contact with the can mouth 30 so that the eccentric dimension is reduced. Thereby, it can prevent that the latching | locking part 42b of the elastic locking piece 42 bends inside.

  According to the cap unit 1 of the present embodiment, the claw breaking phenomenon of the elastic tacking piece 42 at the time of capping to the can mouth 30 can be prevented, and the can mouth 30 or the finger by the lower end of the elastic tacking piece 42 can be damaged. Can be prevented.

  The cap unit 1 is used so as to be attached to the can mouth 30 in a state in which the cap 40 with the elastic tacking piece is closed so as to keep the inside of the can airtight. However, since the packing 10 is made of synthetic resin, the cap unit 1 is used. When the cap 40 with elastic tacking piece is opened and removed from the can mouth 30, the packing 10 may remain in the can mouth. In this case, the packing 10 can be easily removed from the can mouth 30 by pinching the packing protrusion 15. Then, after taking out the contents, the packing 10 is returned into the opened cap 40 with the elastic tacking piece, the cap 40 with the elastic tacking piece is closed, and the cap unit 1 is formed again, and is fitted into the can mouth 30. However, when closing the cap 40 with the elastic locking piece, the lower end of the elastic locking piece 42 is guided to the upper surface of the outward protruding portion 15 a of the packing protruding portion 15, and the outer locking portion 14 c of the packing guide portion 14. To the top surface of the outer portion 14b. This prevents the outer locking portion 14 c from entering the lower end inside the elastic locking piece 42, and reliably covers the lower end of the elastic locking piece 42 with the packing guide portion 14 when the cap unit 1 is used again. be able to.

It is sectional drawing of the cap unit of one Example of this invention. It is sectional drawing of the state which mounted | wore the can mouth with the cap unit of FIG. It is a front view of the packing used for the cap unit of FIG. It is a top view of the packing of FIG. It is AA sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cap unit, 10 ... Packing, 11 ... Packing main body, 11a ... Flat part, 11b ... Ring-shaped protrusion part, 12 ... Peripheral part, 12a ... Conical expansion part, 12b ... Inner protrusion peak part, 12c ... Outer protrusion 12d ... thick wall portion, 12e ... outer standing lower part, 13 ... packing collar, 14 ... packing guide part, 14a ... drooping part, 14b ... outer part, 14c ... outer locking part, 15 ... packing protrusion Part, 16 ... groove, 20 ... sealing member, 21 ... upper wall, 22 ... side wall, 30 ... can mouth, 31 ... upper end arc part, 32 ... side wall concave part, 40 ... cap with elastic stopper piece, 41 ... upper wall, 42. Elastic locking piece.

Claims (1)

A cap with a metal elastic locking piece having an upper and lower wall and a side wall formed of a large number of elastic locking pieces;
Injecting a packing body, a peripheral part for contact with a can opening extending outward from the outer periphery of the packing body, a packing hook part extending outward from the outer periphery of the peripheral part, and a packing guide part extending downward from the packing hook part Synthetic resin packing integrally formed by molding ,
A synthetic resin sealing member that houses the elastic locking piece cap ;
The packing guide portion includes a hanging portion that extends downward from the packing collar, an outer portion that extends outward from the lower end of the hanging portion, and an outer locking portion that extends upward from the outer portion,
In the packing, the packing main body, the peripheral edge portion, and the packing collar portion are accommodated in the cap with the elastic tacking piece, and the drooping portion, the outer portion, and the outer engagement in the packing guide portion Ri Na locked so as to cover the lower end of the elastic鉤止piece by section,
In the closure member is a cap unit Ru provided with a circular annular upper wall and a cylindrical side wall which is integrally molded by injection molding,
A packing protrusion extending outwardly from the outer locking portion of the packing guide ;
The outer diameter of the packing protrusion is larger than the inner diameter of the lower end of the elastic locking piece in the state where the elastic locking piece is open,
The side wall of the sealing member includes a side wall main body portion extending so as to fall substantially vertically from the upper wall of the sealing member, a convex portion projecting to the inner periphery of the lower end portion of the side wall main body portion, and the side wall main body portion. A cap unit comprising: a protective wall that protrudes downward from the lower surface of the lower end portion and covers the tip of the packing guide protrusion .

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