JP2003095291A - Locking mechanism of cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cap from being loosened due to a shock. SOLUTION: A connection structure is provided, such that a cap thread part 4 is fastened in the engagement with a thread part 3 formed around the outer periphery of an opening in a vessel so as to fix the cap on the opening of the vessel. More specifically, a thread valley of the thread part 3 formed around the outer periphery of the opening is provided with convex parts 3a1 to 3a5 to which an end of the cap thread part 4 overrides so as to increase frictional resistance on completion of fastening of the cap, and the thread valley of the thread part 3 is provided with at least one groove 3c into which the cap thread part 4 is fitted between a protruding part 3b and a thread ridge after overriding the part 3b provided between thread valleys to be locked into the thread ridge on completion of fastening of the cap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap that is used for mounting on a mouth of a bottle and sealing the mouth, or a cap used for fixing and holding an ejector at the mouth of a container. It is intended to effectively prevent the liquid leakage due to the looseness.

[0002]

2. Description of the Related Art A cap of a type in which a threaded portion formed at a mouth portion of a container is engaged with a threaded portion suitable for the threaded portion, and a sealing packing is arranged in advance on an inner top surface of the cap. When the cap is tightened, the tip of the mouth of the container is brought into contact with the packing for sealing.

By the way, such a screw-in type cap is loosened when a shock is repeatedly applied to the cap itself or to the container body to which the cap is attached (transportation of goods, distribution process, etc.), which causes liquid leakage. May cause Especially, in the case where the trigger type ejector is attached to the cap, this tendency is often seen, and it is desired to develop a function capable of reliably preventing the cap from loosening.

As a prior document relating to this point, Japanese Unexamined Patent Publication No. 20
Reference is made to the technique disclosed in JP-A-00-335609. However, in general, this type of component member is usually molded from plastic. However, there are variations in molding dimensions and deformation of the molded product. If so, it is difficult to expect a stable anti-loosening effect.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cap that does not easily loosen when the cap itself or a container to which the cap is attached is impacted or an unexpected external force is applied. It is about to propose a locking mechanism.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a connecting structure in which a threaded portion of a cap is engaged with a threaded portion formed on the outer periphery of a mouth of a container and tightened to attach the cap to the mouth of the container. In the thread trough of the screw part formed on the outer periphery of the mouth,
At least one convex portion is provided to increase the friction resistance by the tip of the threaded portion of the cap riding up when the tightening of the cap is completed. Similarly, the tip of the threaded portion of the cap is also formed in the thread trough of the threaded portion when the tightening of the cap is completed. Is a locking mechanism for a cap, characterized in that it has at least one groove portion which fits over the convex portion provided between the thread troughs and fits into the thread.

It is preferable that each of the convex portion on which the tip of the screw portion of the cap rides up and the convex portion on which the tip of the screw portion of the cap rides over be provided with an inclined surface inclined from the outer peripheral surface of the mouth portion of the container toward the side wall of the screw portion. .

Hereinafter, the present invention will be described more specifically with reference to the drawings. 1 to 3 show a locking mechanism according to the present invention,
It is shown as an example when it is applied to a bottle type container suitable for filling contents such as detergent and mold remover, and the mouth of this container has a trigger type as shown in FIG. The cap with the ejector is attached.

1-3, 1 is a container body, 2 is a mouth portion integrally formed with the container body 1, and 3 is a screw portion formed on the outer periphery of the mouth portion 2.

The threaded portion 3 has a thread trough at which the cap is tightened.
When the fitting is completed, the tip of the screw part (thread) 4 of the cap
The convex portion 3a that rides up to increase the frictional resistance between them₁~
3a ₅And the convex portion 3 in which the screw portion 4 is provided between the screw roots.
There is a groove 3c that gets over b and fits into the thread.
It has been burned.

When the cap is engaged with the threaded portion 3 of the mouth 2 and tightened, the threaded portion 4 of the cap is shown in FIGS.
As shown by the phantom line in (c), the packing is provided by engaging through the thread troughs of the screw portion 3 (rotating without any resistance), and the tip of the mouth portion 2 provided on the top surface of the cap. By further tightening at the time of approaching or contacting P, the tip of the screw portion 4 of the cap rides on the convex portions 3a _{1 to} 3a ₅ as shown by the solid lines in FIGS. It will be fitted in 3c.

At this time, since the convex portions 3a _{1 to} 3a ₅ are in strong contact with the screw portion 4 of the cap, the frictional resistance between them is extremely high, while in the groove portion 3c, the screw portion 3 is formed.
The cap is held by the convex portion 3b, and the cap does not loosen easily.

Convex portion 3a₁~ 3a₅, The number of protrusions 3b installed is
There is no particular limitation. Also, the convex portion 3a₁~ 3a₅Protrusion of
Convex portion 3a₁Is made the largest, and the convex portion 3a_Two~
3a ₅, All have the same size, but the convex portion 3a
₁The tightening resistance of the cap is
You can achieve harmony.

The screw portion 4 of the cap has the convex portions 3a _{1 to} 3a ₅
And to facilitate reduced by capping the resistance when ride the protruding portion 3b (for preventing deformation of the cap) in each protrusion, the inclined surface c, it is desirable preferably provided with c ₁ to c ₅ (FIG. 5 (A)-(c)).

The cap locking mechanism according to the present invention comprises:
When the top surface (including the packing) of the cap approaches or contacts the tip of the mouth 2, the projections 3a _{1 to} 3a ₅ ride on the projections 3a _{1 to} 3a ₅ and the projections 3b fit into the groove 3c. There is almost no resistance at the time of tightening the cap until, for example, in the cap provided with the ejector, the screw portion 4 of the cap has the protrusions 3a _{1 to} 3a ₅ ,
The position of the ejector only needs to be adjusted immediately before riding on 3b, and the position of the ejector with respect to the container body 1 can be easily adjusted.

With respect to the locking mechanism having the structure shown in FIGS. 1 to 3 above, a cap equipped with a trigger type ejector is tightened to the mouth of the container with a torque of 215.7 N.cm, and then the ejector is ejected. When the container was rotated once in the direction to loosen the cap (co-rotating), the amount of displacement of the cap was investigated, and it was found that with the conventional locking mechanism with interspersed ribs, the cap was displaced about 12 mm. On the other hand, according to the present invention, it is about 3 mm (the amount of movement in the vertical direction is about 0.16 mm (the range in which liquid leakage can be allowed by the packing arranged on the top surface of the cap)), and the cap is very loose. It was confirmed to be small.

[0017]

According to the present invention, the cap attached to the mouth of the container does not easily loosen due to impact or the like during the process of carrying and distributing the container.

Further, since the screw portion of the cap rides on the convex portion provided on the outer periphery of the mouth immediately before the completion of tightening, the capping characteristic is stable and it is used for fixing and holding the ejector. The cap facilitates alignment of the ejector with respect to the container.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a locking mechanism according to the present invention.

FIG. 2 is a structural explanatory view of a locking mechanism according to the present invention.

FIG. 3 is a structural explanatory view of a locking mechanism according to the present invention.

FIG. 4 is a view showing a trigger type ejector.

5A to 5C are diagrams showing a screwed state of the cap.

[Explanation of symbols]

1 container body 2 mouth portion 3 threaded portion _3a 1 to 3 A screw portion c inclined surface ₅ projecting portion 3b projecting portion 3c groove 4 cap _c 1 to c ₅ inclined surface P packing

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Claims (2)

[Claims] 1. A connecting structure in which a threaded portion of a cap is engaged with a threaded portion formed on an outer periphery of a mouth of a container to tighten the cap, and the cap is attached to the mouth of the container, wherein the outer periphery of the mouth is formed. At least one convex portion is provided in the thread trough of the threaded portion to increase the friction resistance by the tip of the threaded portion of the cap riding up when the tightening of the cap is completed, and similarly, the thread trough of the threaded portion is tightened with the cap. A cap locking mechanism, characterized in that at the time of completion, the threaded portion of the cap is provided with at least one groove portion that fits over the convex portion provided between the thread troughs and fits into the thread. 2. A slack of a cap having a sloping surface on which the tip of the threaded portion of the cap rides up and a projection on which the tip of the threaded portion of the cap rides over have an inclined surface inclined from the outer periphery of the mouth of the container toward the side wall of the threaded portion Stop mechanism.