JP2000281101A - Screwing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain reliable locking and favorable rotational operability by rapidly increasing a sliding frictional resistance force at a position near a threadably coupling limit arranged in a screwing device for generating a necessary sliding frictional resistance force between a screw cap and a bottle mouth by means of the resilient contact of a locking protruding piece and preventing the occurrence of looseness of screwing. SOLUTION: Locking protruding pieces 4 are protrusively provided in such a manner that one of the protruding pieces 4 approaches one side of a thread 11 of a bottle mouth 10 and a screwing thread 3 of a screw cap 1, which are screwed on rach other, and that the other protruding piece 4 is resiliently contacted with the other side thereof. The protruding height of the portion of the locking protruding piece 4 which is resiliently contacted with the other side of the screwing thread 3 and the thread 11 at a position near a threadably coupling limit is made higher than that of the portion of the other locking protruding piece 4. By this method, a sliding frictional resistance force is greatly exhibited at the position near the threadably coupling limit, and the sliding frictional resistance force is arranged to be appropriate at other ranges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screwing device comprising a bottle mouth and a synthetic resin screw cap as an opening / closing cap which is screwed into the bottle mouth. .

[0002]

2. Description of the Related Art In a screwing device comprising a bottle mouth and a screw cap having a cylindrical shape with a top as an opening / closing cap which is screwed into the bottle mouth, a bottle mouth is provided. In order to prevent the screw cap, which is screwed and assembled to the screw tightening limit and seals the bottle, from being deteriorated due to natural loosening of the screw cap with respect to the mouth of the bottle, the peripheral wall of the screw cap is prevented. Is provided with a ridge-shaped loosening-preventing protruding piece having a projecting height lower than that of the screw thread, in parallel with the screw thread to be screwed into the bottle mouth, on the inner peripheral surface of the bottle.

[0003] In this screwing device, when the screw cap is screwed into the mouth of the bottle, the projecting end surface of the anti-loosening projection is formed on the projecting surface of the thread cut into the mouth of the bottle. Elastic contact, due to the sliding frictional resistance generated between the thread at the mouth of the bottle and the loosening protrusion of the screw cap due to this elastic contact,
The natural rotation of the screw cap in the unscrewing direction with respect to the bottle mouth is prevented from occurring, thereby preventing the loosening with the screwed combination.

[0004]

However, in the above-mentioned prior art, the sliding frictional resistance generated between the locking stopper of the screw cap and the thread of the bottle mouth is reduced by the frictional force of the screw cap. Since it increases in proportion to the amount of screwing into the mouth of the bottle, a large amount of operating force is required to tighten and assemble the screw cap to the limit of screwing. Had the problem of becoming extremely bad.

Accordingly, the present invention has been made to solve the above-mentioned problems in the prior art, and the sliding friction resistance force between the screw cap and the mouth of the bottle is determined by the elastic contact of the locking stopper. In the screwing device for preventing the natural loosening of the screwing of the screw cap to the bottle mouth by the sliding frictional resistance, the sliding frictional resistance obtained by the loosening stopper piece is used to reduce the sliding frictional resistance obtained by the bottle stopper. Although the screwing of the screw cap to the part gradually increases until it approaches the limit of the threaded set, it is a technical problem to rapidly increase the required size after approaching the limit of the threaded set. An object of the present invention is to improve the operability of connecting and detaching and to obtain a preferable feeling of use.

[0006]

Means for Solving the Problems Among the present invention for solving the above technical problems, the means according to the first aspect of the present invention comprises a screw formed on the outer peripheral surface of the mouth of the bottle, and a mouth of the bottle. A screw thread engraved on the inner peripheral surface of the peripheral wall of a synthetic resin capped cylindrical screw cap that is screwed into an external fitting from above, and in the vicinity of one of the screw thread and the screw thread. A screw cap screwed into the mouth of the bottle, and a slack-stopping protruding piece for elastically contacting the protruding end with the other surface. And the protrusion height of the anti-loosening protruding portion that starts to elastically contact one of the other protruding threads is set larger than the other anti-loosening protruding portion.

When the screw cap is screwed into the bottle mouth,
In the range up to the limit with the threaded set, only the anti-loosening protruding part having a small protruding height is in elastic contact with either the threaded thread or the thread, so the screw cap and the bottle mouth part No large frictional frictional force is generated between them, and the screw cap can be relatively lightly screwed and rotated with respect to the bottle mouth.

On the other hand, in the range after the screwing of the screw cap to the bottle mouth approaches the screwing assembly limit,
The anti-loosening protruding portion having a large protruding height also makes strong contact with either the thread or the thread, so a large sliding frictional resistance is generated between the screw cap and the mouth of the bottle. Although a relatively large screwing operation force is required, the screw cap which has been assembled to the bottle mouth to the limit with the screwing assembly causes a natural loosening in the screwing assembly state due to the large sliding frictional resistance. Therefore, a stable screwed state is maintained.

According to a second aspect of the present invention, in the first aspect of the present invention, a projection is provided in which the anti-loosening projection is provided in parallel with one of the thread of the screw cap and the thread of the bottle mouth. Structure,
It is a thing that added.

According to the second aspect of the present invention, since the anti-loosening projection has the same thread structure as the thread and the thread, it is easy to integrally form the thread and the thread. In addition, it is possible to easily carry out integral molding of the anti-loosening protruding piece on either the screw cap side or the bottle mouth side.

According to a third aspect of the present invention, in the first aspect of the present invention, the anti-loosening protruding piece is provided in the circumferential direction in the vicinity of one of the screw thread of the screw cap and the thread of the bottle mouth. , And a plurality of protrusion structures provided at intervals along the length.

According to the third aspect of the present invention, since the locking stopper has a plurality of separated protrusion structures, the sliding friction resistance exerted by each locking stopper can be relatively accurately measured. Can be set, thereby exhibiting a good and smooth opening and closing rotation operation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a first embodiment of the present invention, in which a screw cap 1 is integrally formed of a synthetic resin material into a topped cylindrical structure, and its peripheral wall 2 is formed.
The screw 11 provided on the outer peripheral surface of the bottle mouth 10
Thread 3 that is screwed into the thread, and anti-loosening protruding piece 4 having a low protruding height
Are formed in parallel.

When the screw cap 1 is screwed and assembled to the bottle opening 10, the protrusion 4 has a projecting height at which the projecting end face elastically contacts the outer peripheral surface of the thread 11 of the bottle opening 10. However, the protrusion height of the anti-loosening protruding piece 4 is set at the screwing of the screw cap 1 and the bottle opening 10 because the anti-loosening protruding piece 4 is provided on the screw cap 1 side. The screw cap 1 and the bottle mouth 1 correspond to the inner diameter R2 of the lower part of the anti-loosening projection 4 which elastically contacts the thread 11 from the beginning of the assembly.
The projection height of each part of the locking stopper projection 4 is set such that the inner diameter R1 of the upper part of the locking stopper projection 4 that elastically contacts the thread 11 for the first time becomes smaller when 0 is close to the threaded engagement limit. I have.

The inner diameter R1 of the upper part of the loosening protrusion 4
And the inner diameter R2 of the lower part may be a structure that changes gradually or a structure that changes stepwise at an appropriate place. It is sufficient that the upper part of the anti-loosening protrusion 4 elastically contacts the screw 11 in the screwing range near the limit with the screwing set 1.

The inner diameter R1 of the upper part of the anti-loosening protrusion 4 is
It is set to a value that generates a sliding frictional resistance that does not cause the screw cap 1 screwed into the bottle mouth 10 to be naturally loosened and rotated by the elastic contact of the anti-loosening projection 4 with the screw 11. And the inner diameter R2 of the lower part of the anti-loosening protrusion 4.
The anti-loosening protruding piece 4 elastically contacts the thread 11 with as small a force as possible, thereby generating a sliding friction resistance of an appropriately limited size.
The screw cap 1 can be screwed and rotated with respect to 0 without backlash.

FIGS. 3 and 4 show a second embodiment of the present invention, which is close to the thread 11 of the bottle opening 10 and has a central angle 135 from the threading start position A of the thread 11. FIG. The first loosening stopper piece 4 is located at the position B at the center angle 225 °.
, And a third anti-loosening projection 4 is provided at a position D at a central angle of 360 °.

The three locking stoppers 4 are located in the order of the first, second, and third locking stoppers 4 from above, and the third, second, and first locking stoppers 4 The projection height is set so as to increase in order.

[0019]

Since the present invention has the above-described structure, the following effects can be obtained. The slack stopper protrudes strongly against the thread of the bottle mouth in a range close to the screwing limit, including the sealed state of the screw cap with respect to the bottle mouth, and generates a large sliding frictional resistance. In a range other than near the end of the threaded engagement of the screw cap with respect to the bottle mouth, the screw cap is weakly elastically contacted with the thread of the bottle mouth and does not generate a large sliding frictional resistance. A joint rotation operation can be obtained, and a secure and strong seal can be ensured by the screw cap.

According to the second aspect of the present invention, the anti-loosening protrusion has the same thread structure as the screw thread and the screw, and has a configuration in which the protrusion height on the screw limit side is increased. Therefore, the screw can be formed by using the conventional screw forming technology as it is, and the implementation is easy.

According to the third aspect of the present invention, since the individual locking stoppers have a projection structure, the sliding friction resistance exerted by each locking stopper can be set accurately.
Thereby, a smooth and good screwing operation and a reliable loosening prevention operation can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view of a main part of a bottle cap according to an embodiment of the present invention in a state where a screw cap is assembled to a bottle mouth to a closed position.

FIG. 2 is an enlarged longitudinal sectional view of a main part of the embodiment shown in FIG. 1, showing a difference in inner diameter due to a difference in protrusion height between a portion near the screwing end of the anti-loosening protrusion and another portion. FIG.

FIG. 3 is an enlarged vertical sectional view of a main part of another embodiment of the present invention in a state where a screw cap is assembled to a bottle mouth to a closed position.

FIG. 4 is a plan view of a bottle mouth showing an arrangement of three anti-loosening protrusions of the embodiment shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Screw cap 2; Peripheral wall 3; Thread 4; Loosening protrusion 10; Bottle mouth 11; Thread A; Position B; Position C; Position D;

Claims (3)

[Claims] A screw (1) engraved on an outer peripheral surface of a bottle mouth (10).
1), and screwed into the bottle mouth portion (10) in an external fitting manner from above,
Peripheral wall (2) of synthetic resin topped cylindrical screw cap (1)
A thread (3) engraved on the inner peripheral surface, and the thread (3) and the thread (1
1) is provided integrally with the screw cap (1) in a state in which the screw cap (1) is screwed into the bottle opening (10), and the projection end is elastically contacted with the other surface. (4), and the projecting height of the anti-loosening protruding piece (4) that starts elastically contacting one of the screwing thread (3) and the screw (11) in the vicinity of the threaded assembling limit is set. A screwing device which is set to be larger than other slack-preventing projections (4). 2. The anti-loosening protruding piece (4) is connected to a thread (3) and a thread.
The screwing device according to claim 1, wherein the screwing device has a ridge structure provided in parallel with any one of (11). 3. The anti-loosening protruding piece (4) is screwed with a thread (3) and a thread.
The screwing device according to claim 1, wherein the screwing device has a plurality of protruding structures provided in the vicinity of any one of (11) at intervals along the circumferential direction.