JPH0613100Y2 - Anti-rattle mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rattling prevention mechanism which is formed on a bottle mouth tube made of synthetic resin and which prevents rattling of a screw assembly with a cap. It is a thing.

[Prior Art] As a means for preventing rattling between a bottle and a cap screw-assembled with the bottle, in addition to the main screw on the inner peripheral surface of the cap, small screws are formed above the main screw at regular intervals. , A technique has been developed to prevent rattling by sandwiching the screw thread formed on the outer peripheral surface of the bottle mouth cylinder from the upper and lower directions by the main screw and the machine screw (for example, the applicant previously proposed Filed in Japanese Patent Application No. Sho 61-203749).

FIG. 5 is a rattling prevention mechanism manufactured using the technical idea of Japanese Utility Model Application No. 61-203749, and FIG. 6 is an enlarged plan view of the main part thereof. In this mechanism, a screw groove 2 into which a cap machine screw is fitted is provided immediately above a thread 1 with which the main screw of the cap is screwed. That is, when the cap is assembled, the main screw engages with the thread 1, the machine screw fits into the thread groove 2, the main screw is located below the thread 1, and the machine screw is located above the thread 1. By abutting, the rattling of the cap and the bottle mouth tube 4 is prevented.

[Problems to be solved by the device]

However, the problem with this conventional technique is that the main screw fits into the thread groove 2 into which the machine screw should fit, and the assembly of the cap and the mouth tube 4 may not be achieved successfully. If the bottle and the cap have elasticity such as synthetic resin, the main screw can be elastically deformed to be fitted into the thread groove 2, and at the same time, the machine screw is also elastically deformed and the thread groove 2 can be inserted. This is because it is possible to ride on the upper surface of the bank portion 5 immediately above. The fact that the cap and the mouth tube 4 achieve such an assembly not only damages the main screw, the machine screw, the thread 1, etc., but also the cap and the mouth tube 4 are assembled at a fixed position by the alignment mechanism 6. In the case of the attached structure, the alignment cannot be achieved, which is a fatal defect.

The present invention was devised in view of these problems, in which the main screw does not fit into the thread groove 2 and therefore does not damage the main screw, machine screw, thread 1, etc., and further has a positioning function. Then, it aims at providing the rattling prevention mechanism which has a function which always achieves alignment correctly.

[Means for Solving the Problems]

Therefore, a cap having a main screw on the inner peripheral surface thereof and a small screw formed at a constant interval from the main screw is attached to the bottle mouth tube 4 by screwing. The thread 1 and the screw groove 2 into which the small screw is fitted and assembled are formed.

Then, a weir piece 3 having a height at which the cap main screw cannot penetrate is formed at the upper end portion of the spiral groove 2.

[Action]

When the cap is put on the bottle mouth cylinder 4 for screwing and assembling, and pressing force is applied downward while rotating the cap in the screwing direction, the main screw and the screw thread 1 start to screw and The screw fits into the thread groove 2. By further continuing the rotation of the cap from this state, the screwing of the cap and the mouth tube 4 is completed.

In the present invention, since the weir piece 3 having a height such that the main screw of the cap cannot enter is provided at the upper end portion of the spiral groove 2, for example, when the cap is put on the mouth tube 4 and rotation is started, Even if the main screw is located directly above the screw groove 2, the weir piece 3 prevents the main screw from being fitted into the screw groove 2, and the main screw does not fit into the screw groove 2 as in the conventional case.

Further, when the main screw and the thread 1 are screwed together, the machine screw is smaller than the main screw and has a low height, so that the weir piece 3 can be relatively easily overcome and can be fitted into the screw groove 2. .

〔Example〕

One embodiment is shown in FIGS. 1 to 4. This is a bottle made of synthetic resin, and has a positioning mechanism 6 at the lower end of the mouth tube 4.

Two spiral grooves 2 are formed on both the front and rear surfaces of the bottle mouth cylinder 4, and the spiral groove 2 formed at a constant interval with the screw 1 is formed immediately above the spiral grooves 2. The width of the spiral groove 2 is set to be smaller than that of the cap main screw and slightly larger than that of the machine screw.

The height of the weir piece 3 formed at the upper end portion of the screw groove 2 is set to be equal to the height of the thread 1 and the bank portion 5, and the bank portion 5
The screw 1 and the screw 1 are connected in a plane. Of course, the height of the weir piece 3 may be such that the main screw cannot penetrate, and may be slightly lower than the bank portion 5 and the screw 1. That is, the main screw cannot be overridden, but the machine screw must be set to a height at which it can be relatively overridden without great resistance.

[Effect of device]

As described above, in the present invention, since the weir piece 3 is provided at the upper end portion of the thread groove 2, the main screw of the cap does not enter the thread groove 2 and is securely assembled with the thread 1. As a result, damage to the main screw, thread 1, machine screw, etc. can be prevented, and when assembling the cap and mouthpiece 4 having a positioning function, the assembly is always performed at the correct position. Can be achieved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an enlarged front view of an essential part thereof, FIG. 4 is a plan view thereof, and FIG. The front view and FIG. 6 are enlarged plan views of the relevant part. Explanation of reference numerals 1: Thread, 2: Spiral groove, 3: Weir piece, 4: Cylinder, 5: Bank part, 6: Positioning mechanism.

Claims (1)

[Scope of utility model registration request] 1. A rattling prevention cap formed on a bottle mouth barrel (4) to which a cap having a main screw on the inner peripheral surface thereof and a machine screw formed at a constant distance from the main screw is formed. Mechanism (1) in which the main screw of the cap is attached to the screw (1)
And a thread groove (2) into which the machine screw is fitted, and the thread groove.
A rattling prevention mechanism comprising a weir piece (3) formed at an upper end portion of (2) and having a height such that the cap main screw cannot enter.