JP4465953B2 - Structure with cap assembly - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cap assembly structure that prevents natural loosening of a synthetic resin cap.
[0002]
[Prior art]
The cap assembly structure is used in a wide range of fields, as represented by screw caps and bayonet cam caps. In particular, in the case of a cap made of synthetic resin, it can be manufactured inexpensively and easily, and has high sealing performance. It is used in large quantities due to its ability to obtain functions.
[0003]
Synthetic resin caps exhibit the above-mentioned advantages, but when the state of being attached to the mouth tube portion of the casing continues and vibration is applied, the cap is elastically deformed to a part of the cap that is elastically deformed by the attaching force. As a result, the assembly force is reduced and the sealing performance is deteriorated. In addition, there is a problem in that the assembly to the mouth tube portion of the housing is loosened due to vibration during transportation. To do.
[0004]
As a conventional technique for preventing the occurrence of this inconvenience, the cap body is mounted on both the case tube portion and the cap body of the housing to the limit where the rotational assembly is attached, and is overcome from the opening rotational direction side. A locking piece to be locked is provided. By locking the locking pieces together, the cap body is forcibly prevented from rotating in the opening direction with respect to the casing mouth tube portion, so that the cap body is naturally loosened. There is something to prevent (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-270538
[Problems to be solved by the invention]
However, in the above-described prior art, high molding dimensional accuracy is required because of the positional relationship between the limit position where the rotating assembly is attached to the casing mouth tube portion of the cap body and the installation position of both locking pieces. As a result, there is a problem that the molding apparatus becomes expensive and the molding operation takes time.
[0007]
In addition, at the beginning of assembly, even if the locking pieces can be accurately locked at the rotational assembly limit position, the rotational assembly may occur due to a decrease in elasticity or partial permanent deformation over time. There is a problem that the limit position is changed, and there is a case where a sufficient seal cannot be achieved at the rotational position where both the locking pieces are locked.
[0008]
Furthermore, since it is necessary to get over both locking pieces each time the cap body is attached to or detached from the housing mouth tube, a large operating force is required for the attaching / detaching operation, or the resistance change generated during the attaching / detaching operation is large. There is a problem that it is difficult to obtain a good feeling of use such as a bad feeling of use.
[0009]
Therefore, the present invention was devised to solve the above-described problems in the prior art, and a portion between the natural tightening operations immediately before the rotational assembly limit of the cap body to the casing mouth tube portion. The purpose of this technology is to prevent the cap body from sagging and to prevent the cap body from loosening. With the simple structure, the purpose of this is to provide a reliable loosening prevention effect without deteriorating the sealing effect with normal mounting operations. And
[0010]
[Means for Solving the Problems]
Among the aspects of the present invention for solving the above technical problem, the means according to the first aspect of the present invention is a mechanism in which the lower surface of the locking projection protruding from the outer peripheral surface of the mouth tube portion of the housing is inclined at a constant lead angle. A steep slope,
Projecting a plurality of spire-shaped biting protrusions on the flat upper surface, which is the upper surface of the locking protrusion,
Protruding a locking protrusion for locking the upper surface from below to the locking slope of the locking protrusion on the inner peripheral surface of the cylindrical wall of the cap-shaped synthetic resin cap body,
Suspending elastically deformable short cylindrical elastic contact pieces on the lower surface of the top wall provided with the sealing function part of the cap body;
In the rotation assembly limit of the cap body with respect to the mouth tube portion of the housing, the biting protrusion and the elastic contact piece are configured to be in press contact with each other,
It is in.
[0011]
In the state where the cap body is assembled to the position where the pivot assembly is attached to the housing mouth tube portion, that is, the seal function portion is assembled to the position where the seal function is exerted, the elastic contact piece of the cap body bites into the housing. Since the contact piece is pressed from above with respect to the piece, the biting protrusion is assembled with the upper end of the spire shaped elastically deforming the lower end of the elastic contact piece into the biting shape with respect to the elastic contact piece. It will be attached.
[0012]
Due to the bite-like assembly of the biting projection piece against the elastic contact piece, a strong resistance force is generated between the housing and the cap body against the displacement in the lateral direction, that is, the rotational direction, This resistance force reliably prevents the occurrence of natural loosening with a rotating assembly with respect to the housing of the cap body.
[0013]
The pressing contact between the biting projecting piece and the elastic contact piece is performed by a natural tightening operation for achieving the sealing by the sealing function portion immediately before the rotational assembly limit of the cap body, particularly the rotational assembly limit for the housing. Since it is inevitably obtained, it does not require a particularly strong operating force or a special operation, and a feeling of use without a sense of incongruity can be obtained.
[0014]
The biting protrusion and the elastic contact piece only need to face each other in the vertical direction, and alignment along the rotation direction is not required at all, so that high molding dimensional accuracy is not required.
[0016]
Furthermore , since the elastic contact piece is cylindrical, when it comes into pressure contact with the biting cylinder piece, it does not deform in the diameter-expanding direction without being paranoid, and the pressure contact with the biting protrusion piece is reliably achieved. The bite-like assembly with the projecting piece becomes more reliable and strong.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The casing 1 is a blow molded product made of a synthetic resin, and the cylindrical mouth tube portion 3 is attached to the upper end of the bottomed oval cylindrical body portion 2 through an elliptical arc-shaped upper shoulder portion. It consists of standing upright.
[0018]
On the outer peripheral surface of the mouth tube portion 3, a lower surface is inclined at a constant lead angle to form a locking slope 5, and a plurality of steeple-shaped biting protrusions 7 project from a flat, flat upper surface 6. The projecting projection 4 is protruded forward and backward, and naturally the height of the flat upper surface 6 is such that the tip (upper end) of the biting projection 7 is higher than the upper end surface of the mouthpiece 3. It is set at a position that does not protrude.
[0019]
As can be seen from FIG. 3, each biting protrusion 7 has a short ridge shape along the mold opening direction of the blow split mold of the casing 1, so that a good release property can be obtained. I have to.
[0020]
Reference numeral 8 denotes a neck ring.
[0021]
The cap body 9 made of synthetic resin has a top cylindrical shape composed of a top wall 10 and a cylindrical wall 13, and is tightly fitted to the lower end of the top wall 10 at the opening end of the mouth tube portion 3. A thin short cylindrical elastic contact piece 12 is provided on the outside of the short cylindrical sealing function portion 11 that achieves sealing of the cylindrical portion 3, and the locking projection 4 is provided on the inner peripheral surface of the cylindrical wall 13. A pair of protrusion-shaped locking protrusions 14 that are locked to the locking slope 5 from below and inclined at a lead angle equal to that of the locking slope 5 are provided to project forward and backward. The bayonet cam structure is constituted by the locking projection piece 14.
[0022]
The combination of the locking protrusion 4 and the locking protrusion 14 is not limited to the bayonet cam structure, and may be a screwed structure by a combination of a screw and a screw.
[0023]
The elastic contact piece 12 faces the biting protrusion 7 from above in a state where the cap body 9 is assembled to the mouth tube portion 3 so as to be fitted, the cap body 9 faces the mouth tube portion 3, and the seal function portion 11 The biting protrusion 7 is pressed and brought into contact with the biting protrusion 7 at the limit position where the rotating assembly is tightly fitted into the opening end of the mouth tube portion 3, and the biting protrusion 7 is assembled in a biting manner.
[0024]
Further, each biting protrusion 7 has a long ridge shape in the mold opening direction and is in a posture crossing the ring-shaped flat upper surface 6, so that the wide end surface is opposed to the rotation direction. As a result, a stronger resistance is exerted against the natural rotation of the cap body 9.
[0025]
In addition, the sealing function part 11 is not limited to the short cylindrical piece structure which closely fits in the opening end of the mouth tube part 3, but closely elastically contacts the upper end surface of the mouth tube part 3 as shown in FIG. In addition, a projecting strip structure may be used, or as shown in FIG.
[0026]
【The invention's effect】
Since the present invention has the above-described configuration, the following effects can be obtained.
According to the first aspect of the present invention, a plurality of biting protrusions of the casing mouth tube portion and elastic contact pieces of the cap body are bite-like assembled by rotating assembly of the cap body with respect to the casing mouth tube portion. Therefore, in order to obtain this loosening prevention force, there is no fixed mutual rotational positional relationship between the housing and the cap body. The allowable range of the molding dimensional accuracy and the molding dimensional accuracy of the biting protrusion and the elastic contact piece itself is large, so that the molding is easy and the cost required for the molding can be reduced.
[0027]
The biting deformation between the biting protrusion and the elastic contact piece occurs at the same time as or just before the seal is achieved by the sealing function part. You can get a feeling of use without.
[0028]
The biting deformation between the biting protrusion and the elastic contact piece is a state in which the cap body is assembled to the limit to the limit of the rotating assembly, that is, the sealing of the casing mouth tube portion by the sealing function portion is achieved. As a result, the loosening prevention action is always exerted in a state where the seal is achieved, and the sealing of the housing by the cap body is reliably and stably maintained.
[0029]
It is possible to reliably generate the biting deformation due to the biting protrusion of the elastic contact piece, and thereby it is possible to stably obtain the strong loosening prevention force stably.
[Brief description of the drawings]
FIG. 1 is an overall front view of a housing showing an embodiment of the present invention.
2 is an overall side view of the housing shown in FIG. 1. FIG.
3 is an overall plan view of the housing shown in FIG. 1. FIG.
4 is an overall longitudinal side view of the cap body assembled to the housing shown in FIG. 1; FIG.
FIG. 5 is an overall side view in a closed state showing an embodiment of the present invention.
6 is an enlarged vertical side view of the main part of FIG. 5. FIG.
FIG. 7 is an enlarged longitudinal sectional side view of a main part, showing another embodiment of the seal function part.
FIG. 8 is an enlarged longitudinal sectional side view showing a main part of still another embodiment of the sealing function unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1; Housing 2; Body part 3; Mouth part 4; Locking protrusion 5; Locking slope 6; Flat upper surface 7; Biting protrusion 8; Neck ring 9; Cap body 10; 12; Elastic contact piece 13; Tube wall 14; Locking protrusion

Claims (1)

The lower surface of the locking projection (4) protruding from the outer peripheral surface of the mouth tube (3) of the casing (1) is a locking slope (5) inclined at a constant lead angle, and the locking projection ( 4) A plurality of spire-shaped biting protrusions (7) are provided on the flat upper surface (6), which is the upper surface of 4), and the inside of the cylindrical wall (13) of the cap-shaped synthetic resin cap body (9) On the peripheral surface, a locking protrusion (14) for locking the upper surface of the locking inclined surface (5) from below is provided, and a top wall provided with a sealing function part (11) of the cap body (9) ( 10) an elastically deformable short cylindrical elastic contact piece (12) is suspended from the bottom surface of the cap body (9) with respect to the mouth tube portion (3). A structure with a cap assembly in which (7) and the elastic contact piece (12) are in press contact with each other.

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