JPH02282060A - Preventive structure of bottle cap from loosening and molding thereof - Google Patents

Abstract

PURPOSE:To obtain a fastening force not to loosen against vibrations and shock by forming the surface of a bottle opening on the fine uneven face at the place where a buffer member coated at the top face of the bottle contacts the inner face of the cap top. CONSTITUTION:A cap body 5 is made of synthetic resin such as polyolefin resin and the like at the outer periphery of a bottle opening 1 and a male-screw is formed to fit to a female-screw provided on the inside face of the cap body. The surface of the bottle opening 1 having screw threads 2 is formed on a fine uneven face 7 at the place where a buffer member 4 coated at the top face of the bottle contacts the inner face of the cap body. When the cap is fastened so that the inner face of the top plate 5a contacts the buffer member 4 coated on the top face of the bottle opening 1 and stops, side face 2a under the screw thread 2 of the male-screw is pressed together with the side face 6a above the screw thread 6 of the female to increase a compressive stress generated in the axial direction of the bottle opening of respective buffer member 4, the side face under of the screw thread 2 and the side face 6a above the screw thread 6 and the fastening force by means of the friction due to the coarse face 7. In this way, the cap is not loosened by a little impulse and vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a structure for preventing loosening of a lid of a bottle mouth and a method for forming the same, and relates to a male screw portion provided on the outer circumferential surface of the bottle mouth and a structure for preventing loosening of the lid of the bottle mouth. The present invention relates to a structure for preventing loosening of a lid of a bottle opening, which prevents the lid from loosening when screwing together and tightening a female screw portion provided on a surface, and a method for forming the same.

(Prior art) Traditionally, the d-integrated type, in which a female threaded part formed on the inner circumferential surface of the glass bottle is screwed into a male threaded part of the mouth of a glass bottle, has been mainly used because it is inexpensive and easy to mold. They are often made from synthetic resins such as polyolefin resins. However, even if this type of lid is tightened with sufficient torque, it will loosen when subjected to vibrations or shocks due to the friction coefficient inherent in the synthetic resin.
Especially if the content is milky lotion, etc., if the content adheres to the area around the bottle mouth, the content will reduce the frictional resistance between the lid and the bottle mouth, causing the lid itself to slip and completely disappear. This has the disadvantage that a proper tightening condition cannot be obtained.

Also, for example, a protrusion may be provided on the lower side of the thread of the male thread provided on the outer peripheral surface of the glass bottle mouth so that when the lid is fastened, the top surface of the bottle mouth comes into contact with the inner surface of the top plate of the lid. A device has been proposed in which the tightening force between the bottle opening and the lid is increased by the projection pressing against the upper surface of the thread of the female thread of the lid. The threads of the bottle are elastically deformed, creating a gap between the threads of the lid and the bottle protrusion at the front and back of the lid tightening side, reducing the friction surface between the lid and the mouth of the bottle, providing sufficient tightening force. I couldn't do that.

(Problems to be Solved by the Invention) Therefore, the present invention was created in order to solve the problem of the sloping that existed in the past. It is an object of the present invention to provide a structure for preventing loosening of a lid at a bottle opening and a method for forming the same, which can obtain sufficient tightening force to prevent loosening against vibrations, shocks, etc.

(Means for Solving the Problems) Therefore, as a first means, the present invention provides a glass bottle opening having a male screw portion formed on the outer peripheral surface, and a female screw portion formed on the inner peripheral surface. When tightening the synthetic resin lid, a strong frictional force is generated on the side of the lid thread at the position where the buffer member coated on the top surface of the bottle mouth contacts the inner surface of the top plate of the lid. By forming the surface of the bottle mouth including the screw thread into a rough surface with fine irregularities, as a second means, the inner periphery of the glass bottle mouth with a male thread formed on the outer peripheral surface is When tightening a synthetic resin lid with a female thread formed on its surface, the female screw part of the lid is tightened at a position where the buffer member coated on the top surface of the bottle mouth comes into contact with the inner surface of the top plate of the lid. A protrusion that presses the lower side of the screw thread of the male screw part of the bottle opening is formed on the lower side of the screw thread of the bottle mouth part, and this protrusion is designed to follow the deformed shape of the screw thread of the lid that is elastically deformed by the pressure by the protruding end of the protrusion. The protruding end is formed into a shape with a gentle slope in the front and back on the lid tightening side, and the surface of the bottle opening including the threads and protrusions is formed into a rough surface with fine irregularities. As a third means of forming the structure for preventing loosening of the lid of the bottle opening, a mold for forming the glass bottle opening is provided with a recess for forming the glass bottle opening including a screw thread. At the same time, a rough surface with minute irregularities is formed by an appropriate means on the entire inner surface of the mold where the bottle mouth is to be formed. The above objective was achieved by forming the surface to be rough.

(Function) Therefore, in the invention of the slanted top, the glass bottle mouth part 1 has a male screw part formed on the outer peripheral surface, and the synthetic resin lid has a female screw part formed on the inner peripheral surface. When the body 5 is screwed together and tightened until the inner surface of the top plate 5a of the lid body 5 comes into contact with the top surface of the bottle mouth part 1 and stops, the screw thread of the male screw part of the bottle mouth part 1 will be tightened. 2 lower surface 2a and the upper surface 6a of the thread 6 of the female threaded portion of the lid body 5 are in pressure contact with each other, and the buffer member 4 coated on the top surface of the bottle opening 1 and the lower surface 2a of the thread 2 and the upper surface of the thread 6 6a
The tightening force increases due to the compressive stress generated in the axial direction of the bottle neck 1 and the frictional force due to the finely uneven rough surface 7 formed on the surface of the thread 2 of the bottle neck 1. It does not loosen even when subjected to shock or vibration.

In addition, a glass bottle mouth part 1 with a male screw part formed on the outer peripheral surface.
Then, a synthetic resin lid 5 having a female thread formed on the inner circumferential surface is screwed together, so that the inner surface of the top plate 5a of the lid 5 contacts the top surface of the bottle opening 1 with the covered buffer member 4. Tighten until it stops.
The lower surface 2a of the thread 2 of the male threaded portion of the bottle mouth portion 1 and the upper surface 6a of the thread 6 of the female threaded portion of the lid body 5 are in pressure contact with each other, and the lower surface 2a of the thread 2 and the upper surface 6a of the thread 6 are in contact with each other. Due to the compressive stress generated in the axial direction of the mouth part 1, the lower surface 2a of the thread 2 of the bottle mouth part 1
The upper surface 6a of the screw thread 6 of the lid body 5 is pressed and elastically deformed by the protruding end 3a of the protrusion 3 formed in is in close contact with the protrusion 3 on which the inclined portion 3b is formed, and
The frictional force is further increased by the finely uneven rough surface 7 formed on the surface of the screw thread 2 of the bottle opening 1 including the protrusion 3, and the frictional force is further increased to compete with the pressing force of the protrusion 3, resulting in an even greater tightening force. Therefore, it will not loosen even when subjected to shock or vibration.

As a molding method for the structure for preventing loosening of the lid 5 of the bottle spout 1, a glass bottle spout forming mold 8 for molding the glass bottle spout 1 provided with the screw thread 2 is formed, and this mold is A finely uneven rough surface 9 is formed on the entire surface of the concave portion of the mold 8 for forming the bottle mouth 1 by an appropriate means, and the mouth of the glass bottle is formed using this mold 8, including the screw threads 2. Bottle mouth part 1
Since the front opening is formed into a rough surface, there is no need for two processes: the process of molding the bottle and the process of forming the surface of the bottle mouth part 1 into the rough surface 7, and the molding process using the bottle mouth mold 8 can be performed simultaneously. , the surface of the bottle opening 1 including the threads 2 is formed into a rough surface 7.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

Reference numeral 1 shown in the figure is a glass bottle opening, and the outer circumferential surface of the bottle opening 1 is threaded into a female thread provided on the inner circumferential surface of a lid 5 made of synthetic resin such as polyolefin resin. A matching male thread is formed.

When the lid body 5 is fastened to the bottle mouth part 1, as shown in FIG. In order to generate a strong frictional force on the side surface of the screw thread 6 of the lid body 5 at the position where it contacts, the surface of the bottle mouth portion 1 including the screw thread 2 is formed into a rough surface 7 with fine irregularities.

The rough surface 7 provided on the surface of the bottle mouth 1 including the screw threads 2 is formed by physical processing such as sandblasting on the surface of the shaped bottle mouth 1, without any particular limitation on the method of forming it. The mold 8 can be formed by forming a rough surface part 9 on the inner surface of the mold 8 for molding the mouth of the glass bottle, as described later.
When molded using this method, no separate process is required and the molding can be performed at low cost.

In addition, the reference numeral 4 shown in FIG. 2 is a buffer member made of synthetic resin that is coated on the top surface of the bottle opening 1, and is attached to the inner surface of the top plate 5a of the lid 5 when the lid 5 is tightened. This prevents damage to the inner surface of the top plate 5a due to contact with the top surface of the bottle opening 1, increases the compressive stress between the lid body 5 and the top plate 5a, and serves as an inner stopper.

By the way, as shown in FIGS. 3 to 6, the surface of the bottle opening 1 including the screw thread 2 is formed into a rough surface 7 with fine irregularities as described above, and the lid 5 is fastened to the bottle opening 1. When putting on the bottle, at a position where the buffer member 4 coated on the top surface of the bottle mouth part 1 contacts the inner surface of the top plate 5a of the lid body 5, the screw thread 2 of the male threaded part of the bottle mouth part 1 and the lower surface 2a of the lid body The upper surface 6a of the thread 6 of the female thread 5 is pressed against each other, and the compressive stress generated in the axial direction of the bottle opening between the lower surface 2a of the thread 2 and the upper surface 6a of the thread 6 causes the lid 5 to A protrusion 3 that presses the upper surface 6a of the thread 6 of the female thread part
is formed on the lower surface 2a of the thread 2 of the male threaded part of the bottle mouth 1,
As shown in FIG. 5, the protrusion 3 is shaped to follow the deformed shape of the upper surface 6a of the thread 6 of the female screw portion of the cover body 5, which is elastically deformed by the pressure of the protruding end 3a of the protrusion 3. 5 Gentle slope 3 before and after the protruding end 3a on the tightening side
b can also be formed into an angular shape.

Moreover, this protrusion 3 has a protruding end 3 as shown in FIG.
It may be formed in a substantially horizontal shape so that the number a is two or more.

The number and location of these protrusions 3 can be freely set as appropriate, and one or several protrusions are provided on the lower surface 2a of the thread 2 of the male threaded portion of the bottle mouth 1.

On the other hand, the method for forming the rough surface 7 provided on the surface of the bottle mouth 1 including the screw threads 2 involves first forming a glass bottle mouth with a recess for forming the glass bottle mouth 1 including the screw threads 2. As shown in FIG. 7, a finely uneven rough surface 9 is formed on the entire inner surface of the mold 8 where the bottle opening 1 is to be formed, by an appropriate means. And next, this mold 8
The surface of the bottle mouth 1 including the threads 2a is formed into a rough surface 7 by molding the mouth of a glass bottle.

In addition, in the case of a bottle in which a protrusion 3 is formed on the lower surface 2a of the thread 2 of the male threaded part of the bottle mouth part 1 as shown in FIG. A mold 8 for molding the mouth of a glass bottle is formed, which is provided with four parts for molding the protrusion 3 having a gentle slope in the front and rear directions in the tightening direction of the lid 5 of the protruding end 3a. While molding the bottle opening 1 of the mold 8, as shown in FIG. In molding, screw +1. +
2a and the protrusion 3, the surface of the bottle opening 1 is formed into a rough surface 7.

At this time, in any case, the means for forming the rough surface part 9 on the opening surface of the mold 8 for forming the bottle mouth part 1 can be selected from appropriate means such as sandblasting, chemical corrosion, etc.

(Effects of the Invention) Therefore, the present invention provides four screws to fasten the synthetic resin lid 5, which has a female thread on the inner circumference, to the glass bottle opening 1, which has a male thread on the outer circumference. When doing so, the screw threads 2 are tightened in order to generate a strong frictional force on the side surface of the threads 6 of the lid 5 at a position where the buffer member 4 coated on the top surface of the bottle opening 1 comes into contact with the inner surface of the top plate of the lid 5. Since the surface of the bottle opening 1 is formed into a rough surface with fine irregularities, the glass bottle opening has a male threaded part on the outer circumferential surface and a female threaded part on the inner circumferential surface. Resin lid body 5
When the lid body 5 is screwed together and tightened until the inner surface of the lid 5 contacts the buffer member 4 covered with the top surface of the bottle mouth part 1 and stops, the thread 2 of the male thread part of the bottle mouth part 1 is tightened. The lower surface 2a and the upper surface 6a of the thread 6 of the female threaded portion of the lid body 5 are in pressure contact with each other,
Compressive stress generated in the axial direction of the bottle mouth part 1 between the buffer member 4 coated on the top surface of the bottle mouth part 1, the lower surface 2a of the thread 2, and the upper surface 6a of the thread 6, and the screw thread of the bottle mouth part 1. The tightening force increases due to the frictional force caused by the finely uneven rough surface 7 formed on the surface of 2, and it can withstand slight shocks and vibrations without damaging the threads 6 of the lid 5 made of synthetic resin. No slack will occur even if the

In addition, the surface of the bottle spout 1 including the threads 2 is formed into a finely uneven rough surface 7, and the inner peripheral surface of the glass bottle spout 1 having the external thread formed on the outer peripheral surface is When tightening the synthetic resin lid 5 having a female threaded portion formed therein, the lid 5 is tightened at a position where the buffer member 4 coated on the top surface of the bottle opening 1 comes into contact with the inner surface of the top plate of the lid 5. 5 Push the protrusion 3 that presses the top surface 6a of the thread 6 of the female thread into the bottle mouth part 1 The thread 2 of the male thread 2 of the bottom surface 2
a, and the protrusion 3 is formed in the front and rear directions of the protruding end 3a on the tightening side of the cover 5 in order to follow the deformed shape of the thread 6 of the cover 5 which is elastically deformed by the pressure of the protruding end 3a of the protrusion 3. By adopting a structure formed into a shape having a gentle slope 3b, the synthetic resin lid 5 is screwed onto the glass bottle mouth 1, so that the inner surface of the top plate 5a of the lid 5 is aligned with the bottle mouth 1. When tightened until it comes into contact with the buffer member 4 coated on the top surface and stops, the lower surface 2a of the thread 2 of the male threaded portion of the bottle opening 1 and the upper surface 6a of the thread 6 of the female threaded portion of the lid body 5 are mutually connected. Pressure weld, screw thread 2
The compressive stress generated in the axial direction of the bottle opening 1 on the lower surface 2a and the screw thread 6 on the upper surface 6a causes the screw thread 2 of the bottle mouth 1 on the lower surface 2
The upper surface 6a of the screw thread 6 of the lid body 5 is pressed by the protruding end 3a of the protrusion 3 formed in the upper end 3a and is elastically deformed. Therefore, as shown in FIGS. 5 and 6, the screw of the lid 5 is attached to the protrusion 3, which has a gentle slope 3b in the front and back on the tightening side of the lid 5 of the protruding end 3a so as to follow the deformed shape. 1[16] Since the upper surface 6a is brought into close contact with each other, a gap is created before and after the lid tightening side of the protrusion 3, and the friction surface between the lid 5 and the bottle opening 1 is not reduced. Due to the pressing force of Even if the tightening force increases further, the contents such as milky lotion adheres to the bottle opening 1, or the lid body 5 is subjected to strong shocks or vibrations, the lid 5
It is possible to reliably prevent the lid 5 of the bottle opening 1 from slipping without causing any loosening.

In addition, without changing the manufacturing process of the bottle mouth part 1 or changing the structure of the lid body 5, it is possible to increase the number of threads on the male screw part of the bottle mouth part 1 or change the lead angle. By doing so, the function of preventing loosening of the lid body 5 is increased, and it is possible to securely tighten the lid body 5 without causing liquid leakage or the like.

As a method for molding the structure for preventing loosening of the lid 5 of the bottle spout 1, a mold 8 for molding the glass bottle spout 1 is formed, which is provided with four parts for molding the glass bottle spout 1, including the screw threads 2. At the same time, a finely uneven rough surface 9 is formed by an appropriate means on the entire surface of the mold 8 with the concave portion for forming the bottle mouth 1, and when the glass bottle mouth is formed by this mold 8, the screw threads 2 are included. By adopting a method of forming the surface of the bottle opening 1 into a rough surface 7,
There is no need for two processes: the step of molding the bottle and the step of forming the surface of the bottle mouth 1 into the rough surface 7, and the surface of the bottle mouth 1 including the threads 2 is simultaneously formed in the molding process using the bottle mold 8. is formed on the rough surface 7, the loosening prevention structure of the lid 5 of the bottle opening 1 can be easily molded without going through a complicated manufacturing process. If so, it can be mass-produced at extremely low cost.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; Fig. 1 is a front view of the mouth of a bottle with a roughened surface, and Fig. 2 shows a bottle with a roughened surface when the lid is tightened. Front view of the mouth, 3rd
The figure is a front view of the bottle mouth with a rough surface formed by forming protrusions on the lower side of the thread, Figure 4 is a side view of the bottle mouth with the lid tightened, and Figure 5 is the lid. FIG. 6 is an enlarged front view of the screw thread showing the pressure contact state of the thread between the body and the mouth of the bottle, FIG. 6 is an enlarged front view of the thread in another embodiment, FIG. 7 is a cross-sectional view of the mold, and FIG. FIG. 3 is a cross-sectional view of a mold for molding protrusions. 1...Bottle mouth, 2...Threaded thread, 2a...Bottom side,
3...Protrusion, 3a...Protruding end, 3b...Slope part,
4... Buffer member, 5... Lid body, 5a... Top plate, 6
...Screw thread, 6a...Top surface, 7...Rough surface, 8.
...Mold, 9...Rough surface part. Figure @ 7 Figure 4 Figure @ 2 Figure @ 8 Figure

Claims (1)

[Claims] 1. A glass bottle mouth portion with a male screw portion formed on the outer peripheral surface,
When tightening a synthetic resin lid with a female thread formed on its inner circumferential surface, the lid screw thread should A structure for preventing the lid from loosening at the mouth of a bottle, characterized in that the surface of the mouth of the bottle, including the threads, is formed into a rough surface with minute irregularities in order to generate strong frictional force on the side surface. 2. The glass bottle mouth part has a male screw part formed on the outer circumferential surface,
When tightening a synthetic resin lid with a female thread formed on its inner circumferential surface, the female lid A protrusion that presses the upper surface of the thread of the threaded portion is formed on the lower surface of the thread of the male threaded portion of the bottle opening, and this protrusion is shaped into a deformed shape of the thread of the lid body that is elastically deformed by pressure from the protruding end of the protrusion. 2. The structure for preventing loosening of a lid of a bottle opening according to claim 1, wherein the structure is formed to have a gentle slope in the front and back on the lid tightening side of the projecting end. 3. Forming a glass bottle mouth molding mold provided with a recess for molding a glass bottle mouth including a screw thread,
A finely uneven rough surface is formed on the entire surface of the concave portion of this mold where the bottle mouth is formed, using an appropriate means, and when the glass bottle mouth is formed using this mold, the bottle mouth surface including the screw threads is roughened. A method for forming a structure for preventing loosening of a lid at a bottle opening, the method comprising: