CN110902139A

CN110902139A - Safe and easily-opened twist cover

Info

Publication number: CN110902139A
Application number: CN201811089215.XA
Authority: CN
Inventors: 骆轶; 杨春香; 姚旭飞; 顾天一; 周云
Original assignee: YIWU CITY EASY-TO-OPEN CAP INDUSTRY Co
Current assignee: YIWU CITY EASY-TO-OPEN CAP INDUSTRY Co
Priority date: 2018-09-18
Filing date: 2018-09-18
Publication date: 2020-03-24

Abstract

The invention discloses a safe and easily-opened twist cap which comprises a cap top and a cylindrical cap wall formed by downward extending of the outer edge of the cap top, wherein two mutually-parallel convex rings surrounding the cap wall are arranged at the lower part of the cap wall, an annular groove is formed between the two convex rings, a plurality of strip-shaped notches are formed in the groove bottom of the annular groove along the circumferential direction of the cap wall, a bridge is formed by the cap wall between the adjacent notches, the bridge is in an obliquely-arranged equal-width structure, an upper acute angle is formed between the right side of the upper end of the bridge and the notch on the right side of the bridge, and a lower acute angle is formed between the left side of the lower end of the bridge and the. The invention effectively solves the problems that the twist cover in the prior art needs large opening force in the cover opening process and an operator is easy to be injured, greatly facilitates the opening of the twist cover, improves the safety of the opening process and has very high practical value.

Description

Safe and easily-opened twist cover

Technical Field

The invention relates to the technical field of packaging containers, in particular to a safe and easy-to-open twist-off cap.

Background

The bridge on the twist cover in the prior art is usually rectangular and is vertically connected with the anti-theft ring on the twist cover, when the cover body is rotated, the bridge is broken under the action of torsion (transverse shearing force) generated by rotation of the cover body, namely, the twist cover can be rotated to open only if the bridge is broken. The rectangular bridging structure is characterized in that the material is subjected to yield fracture after being subjected to larger transverse shearing force, the fracture point is basically in the middle of the bridging (see figure 12), the torsion required during twisting is larger, the torsion required for rotating the cover body after fracture is suddenly reduced, a hand holding the cover body is forced to rotate at an angle along with the cover body quickly because the force is not removed soon, therefore, the opening difficulty is increased, the bridging and the edge of a cut are basically exposed outside, a plurality of sharp fracture points are formed after the bridging is twisted off, and the hand stopping and rotating along with the cover body quickly is easily scratched by a theft-proof ring or a sharp object on a bottle body (note that the sharp object exists at the mold joint of some plastic bottle bodies except the sharp object on the theft-proof ring), and a great potential safety hazard exists. And on the other hand, in the process of screwing the cover to seal the cover, the cover is sleeved into the opening of the container, after a certain pressure is applied to the cover top, the thread forming cutter in the middle of the side edge of the cover and the sealing cutter at the position of the anti-theft ring at the lower part are rotated, the thread of the cover is formed according to the thread of the opening of the container, and the anti-theft ring of the cover is formed according to the neck structure of the anti-theft ring. In order to ensure the sealing performance of the cover after the cover is closed, a certain pressure is often applied to the top of the cover during the sealing, so that the sealing gasket and the container opening have certain interference to ensure the sealing, but the excessive pressure of the cover can cause the problems of container collapse, container anti-theft ring neck deformation and the like. The twist cover cannot restore to an original state after being opened and bridged to break so as to play a role in theft prevention, but in the practical process, the twist cover can be rotated at a certain angle firstly when being opened due to the fact that the container opening part cannot be completely consistent in forming, the anti-theft ring cannot be particularly attached to a convex ring of the container when being curled, the anti-theft ring and the twist cover move upwards for a small end distance together, the anti-theft ring can be clamped by the convex ring, and the bridge of the twist cover can be broken only by continuously rotating the twist cover; particularly, in a metal container, the cross section of a convex ring of which the neck of a container opening is used for limiting the upward movement of the anti-theft ring can only be formed into an arc-shaped structure, so that the anti-theft ring cannot be tightly attached to the anti-theft ring when being curled and sealed, and generally can rotate for a certain angle when the twist cover is opened, so that a potential safety hazard exists, namely, the twist cover rotates (or loosens) to a certain extent when being touched during certain product carrying and storing processes, namely, the compression amount of a sealing gasket is reduced before a bridge is not broken, and at the moment, the quality guarantee period of the product can be greatly shortened due to the poor sealing property.

Disclosure of Invention

The invention aims to provide a safe and easily-opened twist-off cover for solving the problems that the twist-off cover in the prior art needs large opening force in the opening process and an operator is easy to be injured, the required opening force is small, and the safety of the twist-off cover in the opening process can be greatly improved.

The invention also aims to solve the problems that the container is easy to collapse and the neck of the anti-theft ring of the container is easy to deform due to overlarge capping pressure in the capping process of the prior twist-off cap, and the problems that the container is easy to collapse and the neck of the anti-theft ring of the container is easy to deform due to overlarge capping pressure in the capping process can be greatly reduced.

The third purpose of the invention is to solve the problem that the prior twist-off cover is easy to have poor sealing performance, so that the quality guarantee period of the product is greatly shortened, and the twist-off cover is safe and easy to open and has the characteristics of simple structure, simple structure and good sealing performance.

The invention adopts a specific scheme for solving the technical problems that the twist-off cover which is safe and easy to open is used for sealing the opening part of a container, the twist-off cover comprises a cover top and a cylindrical cover wall formed by downwards extending the outer edge of the cover top, a sealing gasket is arranged on the lower surface of the cover top, two convex rings which are parallel to each other and surround the cover wall are arranged on the lower part of the cover wall, an annular groove is formed between the two convex rings, a plurality of strip-shaped cuts are arranged at the groove bottom of the annular groove along the circumferential direction of the cover wall, the cuts penetrate through the cover wall, the cover wall below the cuts forms an anti-theft ring, the cover wall between the adjacent cuts forms a bridge, the anti-theft ring is connected with the cover wall above the cuts through the bridge, the bridge is of an obliquely arranged equal-width structure, one end of the bridge, which is close to the cover top, is deviated to the right side, and an upper acute angle is formed between the right side of, and a lower acute angle is formed between the left side of the lower end of the bridging and the notch on the left side of the bridging. The bridge between the connecting cover body and the anti-theft ring is designed to be in inclined connection (the whole bridge is in a diamond shape), an upper acute angle is formed between the right side of the upper end of the bridge and the notch on the right side of the bridge, a lower acute angle is formed between the left side of the lower end of the bridge and the notch on the left side of the bridge, and stress concentration points are formed at the corners of the upper acute angle and the lower acute angle, so that the upper acute angle and the lower acute angle are easily torn at the. The anti-theft ring is clamped after rotating a small angle when the twist cover is opened, the cover body continues to rotate anticlockwise, the bridge is firstly pulled to the position vertical to the anti-theft ring, the upper part of the bridge is then inclined to the right and then is fractured, the bridge fracture needs a process, and the bridge fracture cannot be fractured suddenly like the bridge in the prior art. In addition, the bridge is formed into an inclined structure, only the bridge deforms when the bridge is straightened, the required torsion is small, the bridge starts to crack when the bridge is straightened due to the stress concentration point at the acute angle part of the bridge, and the bridge is completely cracked after the bridge is rotated, so that the bridge cracking process is also a gradual change process, the torsional force of the bridge is obviously smaller than that of the conventional scheme, and the buffer function is achieved. In addition, two convex rings which are parallel to each other and surround the cover wall are arranged between the lower part of the cover body and the anti-theft ring, an annular groove is formed between the two convex rings, and the cut for separating the anti-theft ring and the bridging between the adjacent cuts are arranged at the groove bottom of the annular groove, so that the cut and the bridging are both positioned at the concave part of the groove when the cover is turned and turned, the palm is not easily contacted with the palm of an operator, and the palm can be prevented from being injured by sharp after the anti-theft ring is broken (namely the bridging is broken). Therefore, the invention solves the problems that the twist cover in the prior art needs large opening force in the cover opening process and an operator is easy to be injured, greatly facilitates the opening of the twist cover and improves the safety of the twist cover in the opening process.

Preferably, the included angle between the central line of the bridge and the horizontal plane is 45-75 degrees; the bridge is provided with an upper pre-split opening at the connecting part of the upper acute angle, the upper pre-split opening extends along the circumferential direction of the cover wall, the opening of the upper pre-split opening is communicated with the notch, and the length of the upper pre-split opening in the circumferential direction of the cover wall is 10-20% of the width of the bridge. The pre-splitting opening is arranged at the connecting part of the bridge and the upper acute angle, so that the force required for tearing the upper part of the bridge when the cover rotates is smaller, and the cover can be opened more conveniently by twisting. Meanwhile, the pre-split is arranged at the connecting part of the bridge and the upper acute angle, so that the upper end of the bridge can be ensured to be firstly broken, the broken points of the bridge are consistent and neat, and the broken residual sections of the bridge are all left on one side of the anti-theft ring due to the fact that the upper end of the bridge is firstly broken, and the repeated use of the cover is facilitated.

Preferably, the bridge is formed with a lower pre-split at the connection with the lower acute angle, the lower pre-split extends along the circumferential direction of the cover wall and the opening of the lower pre-split is communicated with the notch, and the length of the lower pre-split in the circumferential direction of the cover wall is 50-70% of the length of the upper pre-split. The connecting portion setting of bridge and lower acute angle is split in advance down and can be so that the lid is opened more easily, and the length of split in advance is less than the length of split in advance down simultaneously, and the anti-theft ring one side has all been stayed to the remaining section after the bridge fracture, is favorable to the used repeatedly of lid.

The upper pre-splitting opening and the lower pre-splitting opening can be synchronously formed by improving the die structure when the notch is punched, and the appearance of the twist cover cannot be influenced because the upper pre-splitting opening and the lower pre-splitting opening are micro-cracks.

Preferably, an inner seal ring for abutting against an inner wall of the container mouth and an outer seal ring for abutting against an outer wall of the container mouth are integrally extended downward from an outer peripheral portion of the gasket, and a seal groove with a downward opening is formed between the inner seal ring and the outer seal ring. The twist cover is provided with an inner sealing ring and an outer sealing ring at the matching part of the periphery of the sealing gasket and the container opening, and a sealing groove for being sleeved in the container opening is formed between the two sealing rings, so that after the container opening enters the sealing groove, the inner side surface of the outer sealing ring (namely the outer side groove wall of the sealing groove) clings to the outer wall of the container opening to form outer sealing, the outer side surface of the inner sealing ring (namely the inner side groove wall of the sealing groove) clings to the inner wall of the container opening to form inner sealing, and the groove bottom of the sealing groove clings to the upper edge of the container opening to form upper sealing.

Preferably, the top surface of the sealing gasket vertically corresponding to the sealing groove is provided with a material containing groove, the bottom surface of the material containing groove is arc-shaped, the central line of the cross section of the material containing groove is superposed with the central line of the cross section of the sealing groove, the opening width of the material containing groove is 50-70% of the width of the sealing groove, and the depth of the material containing groove is 30-60% of the opening width of the material containing groove; when the container opening is covered by the twist-off cover which is safe and easy to open, the inner side surface of the outer sealing ring is tightly attached to the outer wall of the container opening, the outer side surface of the inner sealing ring is tightly attached to the inner wall of the container opening, the groove bottom of the sealing groove is tightly attached to the upper edge of the opening of the container, the cross-sectional area of the container groove is reduced, and the groove bottom of the container groove is tightly attached to. According to the invention, the material containing groove is arranged on the top surface of the sealing gasket above the sealing groove, the material containing groove is arranged on the surface, which is in contact with the cover body, of the sealing gasket, when the cover is turned over to seal the container opening, downward pressure is generated when the cover is covered, and the reaction force generated by interference of the sealing gasket is partially absorbed by the deformation of the material containing groove, so that the reaction force can not be completely acted on the container, the bearing pressure of the container is greatly reduced, the problems that the container is easily collapsed due to overlarge cover top pressure in the cover sealing process of the cover turned over in the prior art, the neck part of the anti-theft ring of the container is deformed and the like are solved, and the problems that the container is collapsed and the neck part of the anti-theft ring of.

Preferably, the height of the cross section of the inner sealing ring is greater than that of the cross section of the outer sealing ring (namely the length of the downward extension of the inner sealing ring is greater than that of the downward extension of the outer sealing ring), an interference ring is convexly arranged at the lower part of the outer side surface of the inner sealing ring, and the distance between the interference ring and the bottom of the sealing groove is greater than the axial moving distance of the cover top when the twist-off cover opening bridge is broken; the lower extreme of the lateral surface of interior sealing ring is equipped with direction arc limit, the last edge on direction arc limit is connected with the lower limb of interference ring. The interference ring is convexly arranged at the lower part of the outer side surface of the inner sealing ring, the interference ring is of an annular belt structure which is protruded on the outer side surface of the inner sealing ring, the interference ring can play a role of strengthening sealing when the outer side surface of the inner sealing ring is tightly attached to the inner wall of a container opening, and because the distance between the interference ring and the bottom of the sealing groove is greater than the axial moving distance of a cover top when the anti-theft ring is opened by twisting the cover and broken, namely, in the initial stage of the rotation opening of the twisting cover, when the twisting cover moves a certain distance in the axial direction but the anti-theft ring is not broken, the interference ring is always tightly attached to the inner wall of the container opening, so that the sealing between the inner sealing ring and the inner wall of the container opening before the anti-theft ring is broken is; the guide arc-shaped edge plays a guide role when the twist cover is matched with the container opening.

Preferably, an annular tapered wall with a small upper part and a large lower part is formed on the cover wall close to the cover top, the upper section of the tapered wall is tightly attached to the outer sealing ring to form an outer sealing ring squeezing part, when the cover is unscrewed to seal the container opening, the pressure of the outer sealing ring on the outer wall of the container opening is greater than the pressure of the inner sealing ring on the inner wall of the container opening, and the vertex angle of the tapered wall is 20-40 degrees. The invention forms an annular tapered wall with a small upper part and a big lower part on the cover wall close to the cover top, namely the upper section of the twist cover is of a structure with the small upper part and the big lower part, the cross section of the cover wall of the section is inclined, the outer sealing ring is extruded by the tapered wall to form an extruding part, the inner side surface of the outer sealing ring is tightly attached to the outer wall of the container opening after being extruded by the extruding part, and the pressure of the outer sealing ring to the outer wall of the container opening is greater than that of the inner sealing ring to the inner wall of the container opening, thus ensuring the sealing of the outer sealing ring to the container opening, solving the problem of poor sealing performance of the traditional process in the form of pressing the container opening by the cover top and a single-side (inner side) sealing ring, simultaneously, because the extruding part of the invention is of the tapered structure with the small upper part and the big lower part, the twist cover is easy to come out from the container opening when the twist cover is opened, and avoiding the problem that the twist cover is difficult to open due to the large, the opening of the twist cover is facilitated on the premise of ensuring sealing. The top angle is an included angle between conical walls on two sides of the cover top, the top angle is too small, the lateral extrusion force of the outer sealing ring to the container opening is too large, and the opening force of the twist cover is easily caused to be too large; if the vertex angle is too large, the pressure of the outer sealing ring on the container opening is too small, and although the opening is easy, the sealing performance is poor.

Preferably, the inner side surface of the inner sealing ring and the lower surface of the sealing gasket (i.e. the bottom surface of the sealing gasket which is close to the inner sealing ring and does not extend downwards) are in transition connection through a compression-resistant cambered surface, and the radius of the compression-resistant cambered surface is 0.7-1.3 times of the height of the cross section of the inner sealing ring. The compression-resistant cambered surface is arranged between the inner side surface of the inner sealing ring and the lower surface of the sealing gasket, so that the compression resistance of the inner sealing ring can be obviously improved, and the sealing effect of the interference ring on the inner wall of the container opening is strengthened.

Preferably, a decompression groove extending along the sealing groove is arranged on one side, close to the inner sealing ring, of the groove bottom of the sealing groove, the opening width of the decompression groove is 10% -25% of the width of the groove bottom of the sealing groove, and the depth of the decompression groove is 15% -30% of the width of the groove bottom of the sealing groove; the center line of the cross section of the pressure reducing groove is parallel to the center line of the cross section of the sealing groove, the inner side groove wall of the pressure reducing groove and the inner side groove wall at the groove bottom of the sealing groove are on the same cylindrical surface (namely the inner side groove wall of the pressure reducing groove is formed by extending the inner side groove wall of the sealing groove close to the groove bottom), and the groove bottom of the pressure reducing groove is arc-shaped. The function of the pressure reducing groove is to properly reduce the resistance of the inner sealing ring entering the container opening, and avoid the serious damage to the sealing performance of the container caused by the excessive pressure of the sealing gasket on the opening part of the container due to the excessive resistance when the container opening is covered by the twist-off cover which is safe and easy to open caused by the existence of the interference ring and the pressure-resistant cambered surface. Although the resistance of the opening of the safe and easily opened twist-off cap sealing container can be reduced by reducing the compression-resistant cambered surface, the influence on the sealing performance of the interference ring is large, the pressure reduction groove can reduce the influence to the minimum degree, and meanwhile, the wrinkle at the interference ring is avoided, so that the method is an ideal technical scheme; on the other hand, the size of the cross section of the pressure reducing groove has a great influence on the sealing performance, and the oversize pressure reducing groove not only influences the sealing of the top end of the container mouth, but also reduces the sealing performance of the interference ring, so that the pressure reducing groove needs to be controlled within a reasonable range.

Preferably, the upper part of the cover wall is provided with a plurality of internal pressure release openings punched inwards along the circumferential direction of the cover wall, and the cover wall at the lower side edge of the internal pressure release openings is bent inwards to form an inwards inclined plane structure. The internal pressure release port is used for releasing gas or liquid in the container in time when the pressure in the container is overlarge, so that the serious result caused by direct flying of a twist cover due to overlarge pressure in the container is avoided.

The invention has the beneficial effects that: 1. the problem of prior art turn round the lid open the lid in-process required opening force big and the operator is injured easily is solved, improve greatly and turn round the lid and open in-process security. 2. The problems that in the prior art, the container is easily collapsed and the neck of the anti-theft ring of the container is deformed due to overlarge capping pressure during capping of the twist-off cap are solved, and the problems that the container is collapsed and the neck of the anti-theft ring of the container is deformed during capping of the twist-off cap are greatly reduced. 3. The problem of prior art twist to open the lid and appear the leakproofness variation easily, lead to the product shelf life to shorten greatly is solved.

Drawings

FIG. 1 is a schematic view of one construction of the twist-off cap of the present invention;

FIG. 2 is an enlarged view of a portion of the twist-off cover bridge of the present invention;

FIG. 3 is another enlarged view of a portion of the twist-off cover bridge of the present invention;

FIG. 4 is a partial structural cross-sectional view of the twist-off cap of the present invention;

FIG. 5 is a cross-sectional view of another alternate construction of the twist-off cap of the present invention;

FIG. 6 is a partial cross-sectional view of the twist-off cap of the present invention closing the mouth of a container;

FIG. 7 is a cross-sectional view of another alternate construction of the twist-off cap of the present invention for capping the mouth of a container;

FIG. 8 is a schematic view of the invention in a stressed state during twisting of the lid to close the mouth of the container;

FIG. 9 is an enlarged view of a portion of the twist-off lid bridge fracturing process of the present invention;

FIG. 10 is an enlarged view of a portion of the twist-off lid bridge fracturing process of the present invention;

FIG. 11 is an enlarged view of a portion of the twist-off lid bridge of the present invention at break;

fig. 12 is a partially enlarged view of a related art twist-off lid bridge at the time of fracture.

In the figure: 1. the anti-theft cap comprises a cap top, 2 parts of a cap wall, 3 parts of a sealing gasket, 4 parts of a convex ring, 5 parts of an annular groove, 6 parts of a notch, 7 parts of an anti-theft ring, 8 parts of a bridge, 9 parts of an upper acute angle, 10 parts of an upper pre-split, 11 parts of a lower acute angle, 12 parts of a lower pre-split, 13 parts of a container opening, 14 parts of an inner sealing ring, 15 parts of an outer sealing ring, 16 parts of a sealing groove, 17 parts of a material containing groove, 18 parts of an interference ring, 19 parts of a guide arc-shaped edge, 20 parts of a conical wall, 21 parts of an extrusion part, 22 parts of a compression-resistant.

Detailed Description

The following further describes embodiments of the present invention by way of examples, with reference to the accompanying drawings.

Example 1

In embodiment 1 shown in fig. 1, a safe and easily openable twist-off cap is used for sealing a container mouth, and the twist-off cap comprises a cap top 1 and a cylindrical cap wall 2 formed by downward extending of the outer edge of the cap top, a sealing gasket 3 is arranged on the lower surface of the cap top, an inner sealing ring 14 for abutting against the inner wall of a container mouth 13 and an outer sealing ring 15 for abutting against the outer wall of the container mouth are integrally extended downwards from the outer peripheral part of the sealing gasket, and a sealing groove 16 with a downward opening is formed between the inner sealing ring and the outer sealing ring. The anti-theft cover is characterized in that two convex rings 4 which are parallel to each other and surround the cover wall are arranged at the lower part of the cover wall, an annular groove 5 is formed between the two convex rings, a plurality of strip-shaped notches 6 are formed in the groove bottom of the annular groove along the circumferential direction of the cover wall, the notches penetrate through the cover wall, an anti-theft ring 7 is formed on the cover wall below each notch, a bridge 8 is formed on the cover wall between every two adjacent notches, the anti-theft ring is connected with the cover wall above each notch through the bridge, the bridge is of an obliquely arranged equal-width structure, one end, close to the cover top, of the bridge is taken as a reference, one end, connected with the anti-theft ring, of the bridge is deviated towards the right side (see figure 2), an upper acute angle 9 is formed between the right side of the upper end of the bridge and the notch; the upper part of the cover wall is provided with a plurality of internal pressure release openings 24 which are punched inwards along the circumferential direction of the cover wall, and the cover wall at the lower side of the internal pressure release openings is bent inwards to form an inwards inclined plane structure.

Example 2

In embodiment 2 shown in fig. 3, the bridge is formed with an upper pre-split opening 10 at the connection part of the upper acute angle, the upper pre-split opening extends along the circumferential direction of the cover wall and the opening of the upper pre-split opening is communicated with the cut, and the length of the upper pre-split opening in the circumferential direction of the cover wall is 15% of the width of the bridge; the bridge is formed with a lower pre-split 12 at the junction with the lower acute angle, the lower pre-split extending in the circumferential direction of the lid wall and having its opening communicating with the cut, the length of the lower pre-split in the circumferential direction of the lid wall being 70% of the length of the upper pre-split, the rest being the same as in embodiment 1.

Example 3

In embodiment 3 shown in fig. 4, the top surface of the sealing gasket corresponding to the upper and lower parts of the sealing groove is provided with a material accommodating groove 17, the bottom surface of the material accommodating groove is arc-shaped, the center line of the cross section of the material accommodating groove coincides with the center line of the cross section of the sealing groove, the opening width of the material accommodating groove is 60% of the width of the sealing groove, and the depth of the material accommodating groove is 45% of the opening width of the material accommodating groove; the lower end of the outer side surface of the inner sealing ring is provided with a guide arc-shaped edge 19, and the upper edge of the guide arc-shaped edge is connected with the lower edge of the interference ring. In this embodiment, the height of the cross section of the inner seal ring is greater than that of the cross section of the outer seal ring, an interference ring 18 (the left part of the dotted line in the drawing) is convexly arranged at the lower part of the outer side surface of the inner seal ring, the distance between the interference ring and the groove bottom of the seal groove is greater than the axial moving distance of the cap top when the twist-off cap opening bridge is broken, and the rest is the same as that in embodiment 1 or embodiment 2.

Example 4

In embodiment 4 shown in fig. 5, an annular tapered wall 20 with a small top and a large bottom is formed on the cap wall close to the cap top, the upper section of the tapered wall is tightly attached to the outer sealing ring to form an outer sealing ring pressing part 21, when the cap is unscrewed to seal the container opening, the pressure of the outer sealing ring on the outer wall of the container opening is greater than the pressure of the inner sealing ring on the inner wall of the container opening, and the vertex angle of the tapered wall is 30 degrees. The inner side surface of the inner sealing ring is in transitional connection with the lower surface of the sealing gasket through a compression-resistant arc surface 22, and the radius of the compression-resistant arc surface is 1.1 times of the height of the cross section of the inner sealing ring. A decompression groove 23 extending along the sealing groove is arranged on one side, close to the inner sealing ring, of the groove bottom of the sealing groove, the opening width of the decompression groove is 18% of the width of the groove bottom of the sealing groove, and the depth of the decompression groove is 23% of the width of the groove bottom of the sealing groove; the center line of the cross section of the pressure reducing groove is parallel to the center line of the cross section of the sealing groove, the inner side groove wall of the pressure reducing groove and the inner side groove wall at the groove bottom of the sealing groove are on the same cylindrical surface, and the groove bottom of the pressure reducing groove is arc-shaped. When the cover is turned over to seal the container opening, the inner side face of the outer sealing ring is tightly attached to the outer wall of the container opening, the outer side face of the inner sealing ring is tightly attached to the inner wall of the container opening, the groove bottom of the sealing groove is tightly attached to the upper edge of the opening of the container, the cross sectional area of the material containing groove is reduced, the groove bottom of the material containing groove is tightly attached to the lower surface of the cover top (see figure 7), and the rest is the same as that in embodiment.

The bridge connecting the cover body and the anti-theft ring is designed to be in inclined connection (a diamond structure), the inclined direction is that the upper part is towards the left, the lower part is towards the right, the anti-theft ring is clamped after rotating for a small angle when the twist cover is opened, the cover body continues to rotate anticlockwise, the upper pre-split at the upper end is firstly torn after the bridge is straightened, the length of the split is lengthened (shown in figure 9), the cover body continues to rotate anticlockwise, the upper end of the bridge is inclined towards the right, the length of the upper pre-split is further lengthened (shown in figure 10) until the upper end of the bridge is completely broken, the cuts at two sides of the bridge are communicated, and the broken residual sections. The bridge breaking process is a gradual change process, and the twisting-off force of the bridge breaking process is obviously smaller than that of the conventional scheme, so that the bridge breaking process has a buffering function. Secondly, two convex rings which are parallel to each other and surround the cover wall are arranged between the lower part of the cover body and the anti-theft ring, an annular groove is formed between the two convex rings, and the cut for separating the anti-theft ring and the bridging between the adjacent cuts are arranged at the groove bottom of the annular groove, so that the cut and the bridging are both positioned at the concave part of the groove and are not easy to contact with the palm of an operator when the cover is turned and twisted, the palm and the sharp prick after the anti-theft ring is broken (namely the bridging is broken) can be avoided, and the safety of the twisted cover in the opening process is improved. In addition, the safe and easily-opened twist-off cover is provided with an inner sealing ring and an outer sealing ring at the container mouth matching part at the periphery of the sealing gasket, a sealing groove for being sleeved in the container mouth is formed between the two sealing rings, so that after the container mouth enters the sealing groove, the inner side surface of the outer sealing ring clings to the outer wall of the container mouth to form outer sealing, the outer side surface of the inner sealing ring clings to the inner wall of the container mouth to form inner sealing, and the groove bottom of the sealing groove clings to the upper edge of the container mouth to form upper sealing (see figure 7, the overlapping part in the figure is the compression part of the sealing gasket in actual matching), so that the. The top surface of the sealing gasket above the sealing groove is provided with a material containing groove which is arranged on the contact surface of the sealing gasket and the cover body, when the cover is turned over to cover the container opening, downward pressure F1 is generated when the cover is covered, and reaction force F2 (shown in figure 8) generated by interference of the sealing gasket is generated, and part of the reaction force can be absorbed by the material containing groove in a deformed way, so that the reaction force can not be completely acted on the container, the bearing pressure of the container is greatly reduced, and the problems of container collapse, container anti-theft ring neck deformation and the like caused in the cover closing process of the cover are greatly reduced. Meanwhile, the interference ring is convexly arranged at the lower part of the outer side surface of the inner sealing ring, the interference ring is of an annular belt structure protruding on the outer side surface of the inner sealing ring, the interference ring can play a role of strengthening sealing when the outer side surface of the inner sealing ring is tightly attached to the inner wall of the container opening, because the distance between the interference ring and the bottom of the sealing groove is larger than the axial moving distance of the cover top when the anti-theft ring is opened by twisting the cover and broken, namely, in the initial stage of the rotation opening of the twisting cover, when the twisting cover moves a certain distance in the axial direction but the anti-theft ring is not broken, the interference ring is always tightly attached to the inner wall of the container opening (see fig. 6, the state shown in fig. 6 is the leakage critical state of the container), the sealing between the inner sealing ring and the inner wall of the container opening before the anti-theft.

In addition to the above embodiments, the technical features or technical data of the present invention may be reselected and combined to form new embodiments within the scope of the claims and the specification of the present invention, which are all realized by those skilled in the art without creative efforts, and thus, the embodiments of the present invention not described in detail should be regarded as specific embodiments of the present invention and are within the protection scope of the present invention.

Claims

1. A safe and easy-to-open twist-off cap for sealing the mouth of a container, characterized in that the twist-off cap comprises a cap top (1) and a cylindrical cap wall (2) formed by extending the outer edge of the cap top downwards, the lower surface of the cover top is provided with a sealing gasket (3), the lower part of the cover wall is provided with two convex rings (4) which are parallel to each other and surround the cover wall, an annular groove (5) is formed between the two convex rings, the groove bottom of the annular groove is provided with a plurality of strip-shaped notches (6) along the circumferential direction of the cover wall, the cut penetrates through the cover wall, the cover wall below the cut forms an anti-theft ring (7), the cover wall between the adjacent cuts forms a bridge (8), the anti-theft ring is connected with the cover wall above the notch through a bridge which is an obliquely arranged equal-width structure, taking one end of the bridge close to the cover top as a reference, and enabling one end of the bridge connected with the anti-theft ring to deviate towards the right side; an upper acute angle (9) is formed between the right side of the upper end of the bridge and the cut on the right side of the bridge, and a lower acute angle (11) is formed between the left side of the lower end of the bridge and the cut on the left side of the bridge.

2. The safe and easy-to-open twist cap as claimed in claim 1, wherein the angle between the center line of the bridge and the horizontal plane is 45 to 75 degrees; the bridge is provided with an upper pre-splitting opening (10) at the connecting part of the upper acute angle, the upper pre-splitting opening extends along the circumferential direction of the cover wall, the opening of the upper pre-splitting opening is communicated with the notch, and the length of the upper pre-splitting opening in the circumferential direction of the cover wall is 10-20% of the width of the bridge.

3. A secure easy open twist-off cap according to claim 2, characterized in that the bridge bridges in connection with the lower acute angle are formed with a lower pre-split (12) extending in the circumferential direction of the cap wall and having its opening communicating with the cut, the length of the lower pre-split in the circumferential direction of the cap wall being 50-70% of the length of the upper pre-split.

4. The safe and easy-to-open twist-off cap according to claim 1, characterized in that an inner sealing ring (14) for abutting against the inner wall of the container opening (13) and an outer sealing ring (15) for abutting against the outer wall of the container opening are integrally extended downward from the outer peripheral portion of the sealing gasket, and a sealing groove (16) with a downward opening is formed between the inner sealing ring and the outer sealing ring.

5. The safe and easy-to-open twist-off cap as claimed in claim 4, wherein the top surface of the sealing gasket corresponding to the upper and lower parts of the sealing groove is provided with a material containing groove (17), the bottom surface of the material containing groove is arc-shaped, the center line of the cross section of the material containing groove coincides with the center line of the cross section of the sealing groove, the opening width of the material containing groove is 50% to 70% of the width of the sealing groove, and the depth of the material containing groove is 30% to 60% of the opening width of the material containing groove; when the container opening is covered by the twist-off cover which is safe and easy to open, the inner side surface of the outer sealing ring is tightly attached to the outer wall of the container opening, the outer side surface of the inner sealing ring is tightly attached to the inner wall of the container opening, the groove bottom of the sealing groove is tightly attached to the upper edge of the opening of the container, the cross-sectional area of the container groove is reduced, and the groove bottom of the container groove is tightly attached to.

6. The safe and easy-to-open twist-off cap as claimed in claim 4, wherein the height of the cross section of the inner sealing ring is greater than that of the cross section of the outer sealing ring, an interference ring (18) is convexly arranged at the lower part of the outer side surface of the inner sealing ring, and the distance between the interference ring and the groove bottom of the sealing groove is greater than the axial moving distance of the cap top when the opening bridge of the twist-off cap is broken; the lower extreme of the lateral surface of interior sealing ring is equipped with direction arc limit (19), the last edge on direction arc limit is connected with the lower limb of interference ring.

7. The twist-on cap of claim 1, wherein the cap wall near the cap top is formed with an annular tapered wall (20) with a small top and a large bottom, the upper section of the tapered wall clings to the outer sealing ring to form an outer sealing ring pressing part (21), when the twist-on cap is used for sealing the container opening, the pressure of the outer sealing ring on the outer wall of the container opening is greater than that of the inner sealing ring on the inner wall of the container opening, and the vertex angle of the tapered wall is 20-40 degrees.

8. The safe and easy-to-open twist cap as claimed in claim 7, wherein the inner side surface of the inner seal ring is transitionally connected with the lower surface of the seal gasket by a compression-resistant arc surface (22) having a radius 0.7 to 1.3 times the height of the cross section of the inner seal ring.

9. The safe and easy-to-open twist-off cap according to claim 8, wherein a decompression groove (23) is provided on the groove bottom of the sealing groove on a side close to the inner sealing ring, extending along the sealing groove, and has an opening width of 10% to 25% of the groove bottom width of the sealing groove and a depth of 15% to 30% of the groove bottom width of the sealing groove; the center line of the cross section of the pressure reducing groove is parallel to the center line of the cross section of the sealing groove, the inner side groove wall of the pressure reducing groove and the inner side groove wall at the groove bottom of the sealing groove are on the same cylindrical surface, and the groove bottom of the pressure reducing groove is arc-shaped.

10. A safe and easy-to-open twist-off cap as set forth in claim 1, wherein the upper portion of the cap wall is provided with a plurality of inwardly punched internal pressure relief openings (24) along the circumferential direction of the cap wall, and the cap wall at the lower side of the internal pressure relief openings is bent inwardly to form an inwardly inclined ramp structure.