KR810000133B1 - Tabless container opening device and method and tools for forming the same - Google Patents

Abstract

This invention relates to an improved method and appts. for forming and construction for a digitally openable container end closure. There is provided a central panel(12) having at least one circular and relatively rigid opening panel(22) contoured to include an inwardly domed center portion(33) bounded by a rim(28) peripherally terminating in a fracturable web(24). The corners(74) and (80) are disposed in predetermined laterally spaced relation and define between the lateral extent of the fracturable web.

Description

Lid of metal container

1 is a plan view of the top lid of the present invention.

FIG. 2 is an enlarged cross-sectional view of the can top lid of FIG.

Fig. 3 is an illustration of an enlarged cross-sectional view of a can top lid of the present invention bonded onto a container and a web (Web) that starts to rupture by applying a finger to the outward convex napon portion.

FIG. 4 is a cross-sectional view of the third trickle illustrating a state in which the top lid of the can is opened. FIG.

5 is a view of the lid of the present invention constructed in another way.

6 is a cross-sectional view of the lid.

7 is a cross-sectional view of a container wall forming tool seat according to the present invention.

8 is a partially enlarged cross-sectional view of the FIG. 7 tool illustrating an intermediate process of forming a fragile web on the wall of the vessel.

9 is a cross-sectional view of the seventh flow diagram illustrating a state in which the positional movement of the mold is increased in the process of forming a web that is easy to be broken on the wall of the container.

10 is a partially enlarged cross-sectional view of a container wall currently employed by the principles of the present invention.

11 is a plan view of the top lid of the present invention molded in another way.

12 is an enlarged cross-sectional view of a can top lid taken along line 11-12.

13 is a cross-sectional view of a tool for forming a cut line in the container wall shown in FIG.

14 is a partially enlarged cross-sectional view of the tool.

15, 16 and 17 are partially enlarged cross-sectional views illustrating other types of tools that may be used in embodiments of the present invention as in FIG.

The present invention relates to a lid of a metal container, in particular a lid that has been improved for opening by hand, which satisfies today's demanding and competitively demanded commercial utility and performance standards and satisfies all social issues based on current legislation. will be.

The metallurgical container manufacturing industry and its increasing demand for metal sheeting have become one of the key factors in promoting the growth and economic power of the national economy. For example, about 40 billion cans are manufactured each year just to store and store drinks such as soda and beer. In the face of ever more sensitive price fluctuations over the past 75 years, commercial and competitive mutual benefits and metal containers have been applied in response to the ever-increasing demand for product integrity against government regulations and legal pressures. This has led to the development of increasingly stringent performance standards.

In recent years, consumer habits have changed, and the desire to have a metal container that can be opened directly by hand without the need for assistive devices has grown. lost.

In the field of beverage containers, although there are a large number of proposed methods when considering this and the accompanying adverse economic considerations, such demands have recently led to the production of lids that can be easily opened by pulling tabs that have become widespread in the industry. To some extent.

However, the widespread use of these caps means that the metal parts and manufacturing processes inevitably increase the cost of remanufacturing, as well as the removal of the tabs, which are so sharp that they are unfortunate and immediately discarded indiscriminately. The habit has caused serious social problems. In some cases, such indiscriminate tapping problems have led to the implementation or construction of such lid recipes that cause very large problems for canners. As mentioned above, hundreds of methods have been proposed using previous techniques, especially patented techniques, to achieve the goal of simply opening the can for a long time, including many ways to open the can lid with a finger without the aid. . Among these methods are as follows. In other words, the metal walls, which are easily broken, are made in the shape of cut lines or plates in the container wall and the lid to make holes for pressing or tearing them open.

These caps use a hard tool such as coins or forks to pierce the holes, tearing away the removed portions along the inscribed lines, and some making embossments so that they can be pressed and torn out there. Perforated lids, or a web that is easy to break perpendicular to the container wall.

Initially, the metal is moved along a sideline perpendicular to the surface of the vessel wall, which is initially immovable, so that the edges that form the edges of the removal wall portion overlap under the corresponding edge of the unremoved wall portion. It has also been proposed to form a tearing line in the form of a fragile web on the lid of the top of the container in such a way that the cross-sectional wall thickness is very thin.

This method applies a force to the outer surface of the web, which is the resistance to breaking of the tearing web of the bar, which may be caused by internal pressure, to indicate the part of the removal wall that is larger than the resistance to cutting when the lid is opened. It has been known that when metals are deformed at right angles to the metal tube surface according to this method, small cracks or accidental cuts may be caused in the fragile webs, especially for hard metals. Another method is to form a thin and weak part, in which a thin wall is formed at an angle of 45 ° between the mold surface and the circular edge of the mold part with respect to the transfer side of the mold part.

However, to the best of our knowledge, none of the above methods have met the rigorous and complementary correlated utility and performance standards for widespread use in containers such as beverages. It's been a long time since having a container lid with a removable portion that can be opened in without the need for a separate tool or holding tab. As pointed out above, we have developed a configurable method of fragile webs that is efficient and satisfactory to use because of the social problems caused during widespread use, despite the added waste of tapping. It has been urgently needed.

Herein, the present invention will be described in detail with reference to the conventional method.

One method presented a container having a pressurized tab defined by a U-shaped cut or groove through a material sealed with a sealing material. Pressing slightly against the face of the tab in the closed position completely removes friction at the edge of the tab against the edge of the cap, thereby opening the container.

Another method proposed a sealing member having a tongue or tab pressurized therein with an edge located coupled to a shoulder on the lid. Except for the connecting hinge, the metal is completely separated between the tab and the lid, and a suture overlay made of plastic-soaked paper or the like is coated on the inner surface of the lid. The encapsulant is formed annularly over the edge of the tab. The lid includes an inner rang or fixing portion for firmly securing the lid near the rim. For the lid of this method, the container component of the present invention has a fragile web of material instead of a separation line covered by the suture material and has a bent portion around the opening piece. This method does not suggest adjacent breakable webs or bent portions as claimed by the present invention.

Another method proposes a can with a lid with two gold indents pressed against the can's body. The inward pressing area is defined by gold over the entire area except the inner edges that form the hinge line. The lid is secured by one or more rips and an upwardly bulging portion arranged inside the tab. This method does not suggest a bent portion or a fragile web that lies substantially in line with the tip of the exposed edge in the web where the base of the bent portion is prone to breakage, as described in my claims. Since the bottom of the bent portion and the exposed edge of the bent portion in the container component of the present invention are in a straight line, tearing of the opening piece due to the overpressure in the container can be prevented. The carved gold of this method is a simple V-shape in the lid and is not aligned in the claims of the present invention.

Another method knocks out the lid with tabs defined by the notched gold 14. The tab has certain fixed members that allow the tab to be pressed into the can. The lid furthermore forms a raised portion that prevents the tab from accidentally entering inwardly, or a recess in which the thumb can be placed so that the thumb has little chance of slipping on the tab or being scratched by the edges around the tab. Has a lip. There is a raised portion that serves as a thumb guard and a safety protrusion on the lid. This method does not show the bent portion around the opening piece, nor does it indicate that it is in line with the base of the bent portion and the exposed edge of the fragile web.

The most important and salient feature of the present invention for another method is the raised bend around the opening piece. It is important to note that the raised bent portion is connected to the opening piece via a web that is susceptible to break out of the unilateral plane of the can tip so that the web is partially pressurized when the bent portion is pressurized by the finger. The lip does not expect the bent portion of the invention because the lip is located outward from the controllable wall portion or opening piece. Therefore, the tear line of this method does not connect the raised part of the lip to the removal wall part. Any bending of the lip does not cause it to break as in the container component of the present invention unless the pressure is partially applied to the tear line.

Another method represents a Push-in can lid with inscribed gold defining a tab that protrudes upwards. One sphere includes a lip that simultaneously forms a point at which the thumb can tilt while supporting the raised thumb from the can. Another embodiment exhibits an embossed groove for a tab that allows it to be rolled into the interior of the lid of the opening piece thereby removing the burr that is characteristic of the rupture opening lid. This method does not indicate that the bent or bent portion as claimed in the present invention is in line with the tip of the edge in the web that is susceptible to breakage.

Another method represents a can tip having a raised area of the channel portion around the tip and a tab attached to the raised area for rocking back and forth to destroy the notched gold. This method does not exhibit a relatively rigid opening piece with raised bent portions as the present invention includes.

No bending part is presented or suggested in any conventional method. The bent part is very important because it causes it to start breaking by a few pounds of finger force. The devices of the prior art are all opened by pressing the movable opening piece, and the device according to the invention is opened by pressing the raised bent portion near the opening piece. Pressing the second bent portion generates high local pressure in the web. In the conventional method, there is no suggestion that it is possible to open the container component by applying pressure near the opening piece rather than directly applying pressure to the opening piece. The container component according to the invention is thus completely different from the conventional methods.

In the present invention, the structure of the metal container which has a web which is easy to be destroyed as an important part in the boundary which separates the opening piece which can be opened in at least one inward opening on the substantially flat metal plate wall, and is separated from the adjacent container surface. Developed. In addition, the edge of the opening piece intersects at the first end with the inner end of the adjacent vessel wall described above, and the end of the adjacent container face is at the end of the opening piece at the second bend, which may be arranged essentially in line with the top of the opening edge. Intersecting with the part, the bent parts are arranged with a predetermined gap between them to limit the length of the reason between them, limiting the tendency of the fragile web and the swelling part extruded out from adjacent webs to the side Therefore, when the opening piece is pushed inward by hand, the mutual position of the bent portions is changed, so that the web is subjected to the force to start breaking and to be pushed into the container of the separated opening piece.

In addition, the present invention has an opening piece and a bent protrusion that can be opened into one or more intimately arranged at the boundary of a sufficiently pressed fragile web (Web) of the selected form. The molding method of metal bath base material was developed. It forms the first obtuse angled resurrection on the metal plate of the vessel wall in the first mold with flat horizontal and oblique salt and forms the second acute angled angle in the second mold with the flat horizontal and inclined surface and then the first against the metal plate. It is placed on the same side of the template and has a horizontal plane facing the same as the horizontal plane of the first template, and is formed by using the horizontal plane of the second template and the auxiliary template placed sideways. Move the first template in a straight line towards the second template, and approach the horizontal and inclined planes of the first template to the inclined and horizontal planes of the second, respectively, so that the edges of the two molds can be operated. The metal plate is angled at right angles, and the interaction between the bottom face of the two molds and the protruding surfaces pushes the resurrection aside to form the fragile web mentioned above and the bottom face of the first mold is almost identical to the bottom face of the second mold. Then, the mold stops moving, and the auxiliary mold moves in a straight line toward the second mold so that its bottom surface moves to a position where the bottom part of the second mold divides into a series, and the interaction of the aforementioned mold is formed.

Furthermore, in the present invention, a metal having an opening piece and a protruding protrusion that can be opened into one or more intimately arranged borders of a sufficiently pressurized fragile web of a selected shape. A device for forming a container component was developed. It is the same as the first form with the flat bottom and angular protrusions forming the first obtuse angled bend and the second form with the flat base and angular protrusions forming the second obtuse angled angle and the bottom of the first form. It consists of a base frame of the second mold and a side mold disposed laterally, having a bottom surface for forming a metal in a direction.

The first and sub-frames can be moved in a straight line relative to the second frame, i.e. the bottom and protrusion of the first frame correspond to the protrusions and bottom of the second frame, respectively, and the first and second edges of the two frames are placed next to each other. So that the bottom face of the first mold is almost coincident with the bottom face of the second mold, and the bottom face of the auxiliary mold is vertically divided in the direction of movement of the mold with the bottom of the second mold. When the metal plate is moved and closed, the metal plate bends almost at right angles by the action of the bottom faces of the first and second dies, and the part of the metal plate is pushed sideways within the movement range by the interaction of the bottom and protrusions of the first and second dies. And the interaction between the bottom of the second mold and the bottom of the auxiliary mold To bend as to form an easy part.

The advantage of the present invention is that it is commercially viable, satisfactory in performance standards, and satisfies current social problems based on various legal regulations. A more unique advantage is the reduction of metals and the amount used, allowing a simple tool to produce highly reliable container lids at very high production speeds in just a few process steps. Also, it can overcome the social problems caused by the current tab method because the point that can be opened by hand without using other aids and the lid opens into the container and the open lid becomes larger than the size of the opening. This is a big advantage.

The present invention will now be described in more detail with reference to the drawings.

As shown in FIG. 1 and FIG. 2, the upper lid 10 of the container has a flat middle lid plate 12, and a circumferential groove 14 is dug around the plate, and the wall is formed on the outside of the groove. A portion 16 stands, with a rim wing 18 extending out from the top of the wall, with a folded edge 20 at its end.

In this way, the lid of the can is rimmed and sealed in a container by a conventional overlapping bonding process.

To facilitate and clarify the understanding of the present invention, the expression “inward” and “outward” is used to describe the direction inside and outside of the cylindrical container with the raised lid which is the point of the present invention. use.

The can top lid 10 of the present invention has at least one, but preferably two, inwardly open openings bounded by a breakable web-shaped cutout line 24 formed behind the lid plate 12 (開口 片 22). The opening piece is pushed inward into the container to open a hole in the lid 10.

In the example illustrated in FIGS. 1 to 4, the fragile web 24 has a ＂C＂ shape, and there is a connecting metal piece between both ends of the web wire, so that the opening dog 22 serves as a hinge. Prevents complete separation from the upper lid (10).

The hinge 26 at the end of the web wire may be made to bend by shallow gold, and may not be so.

Even when the pressure inside the container becomes too high and the web 24 suddenly breaks, the opening 22 does not completely separate from the upper lid 10 because of the hinge 26.

The hinge 26 prevents it from falling into the container even after the opening piece 22 is opened.

Features of the container made according to the principles of the present invention are characterized by the end edge portion 28 of the opening piece 22 adjacent the web 24 and the end portion 30 of the middle lid plate 12 on the other side of the web having two ends. The opposite sides of the portions 28, 30 are shaped to be nearly coplanar.

As shown in FIGS. 1 through 4, the top surface of the end edge portion 28 of the at least one opening piece 22 is approximately coplanar with the bottom surface of the adjacent lid plate end located on the other side of the web. Another feature of the present invention is that the web 24, best shown in FIGS. 2 and 9, is adjacent and has a protrusion on the central lid plate 12. FIG. If the protrusion is bent or pressed by hand, it will facilitate the breakage of the web 24 as it constitutes a part of the bendable portion. That is, since the relative position of both parts of the web is changed, the metal of the folded part is pressed and fracture occurs.

The protrusions 32 are placed around the opening punch 22 of the can upper lid 10 or the protrusions 33 are formed inside the opening pieces 22.

The top lid of the can, depending on the purpose of use, for example, can be used in a canned or unfilled can, or in a can that can be opened automatically, depending on which case the adjoining sides of the web 24 The physical properties of the part and the bendable parts 32 and 33 may be made inside or outside the container. The can top lid 10 shown in Figs. 1 to 4 is used to seal a relatively high pressure container, and the end edge portion 28 of the opening piece 22 is the center of the other side of the web. Since it is positioned downward with respect to the adjacent portion 30 of the lid plate 12, the web has a greater bearing capacity against breakage by the internal pressure of the container than breakdown by external force applied to the opening piece 22. . This change in strength along the direction of the force is already undermined by the US patents punte 2,187,433 and Geiger 3,362,569, which is believed to be the result of overlapping portions on both sides of the perforation line.

The flexible part 32 is molded outward with respect to the surface of the curl 10 before being deformed, and when the opening piece 22 or its flexible part 32 is pressed by hand, the flexible part 32 is bent and the position thereof is selectively changed to provide a web 24. Makes it easy to destroy. As shown in FIG. 3, at least a portion of the center lid 12 is bent and moved by pressing the opening piece 22 protruding outward. At this time, it is not yet understood for sure, but it is believed that when the portion of the middle cover plate 12 is bent so much, both adjacent portions of the web are relatively changed in position so that the thin residual metal portions constituting the web are pressed and destroyed. . It is also believed that when the portion of the lid plate 12 is bent so that its position is changed, the thin residual metal portion constituting the web is also bent, further facilitating its destruction. As the opening piece 22 is pressed further, the web 24 around it continues to separate, and as shown in FIG. 4, the connection is finally opened inward, leaving only the hinge 26 portion. When both opening pieces 22 are open, one hole is used to pour or drink the contents of the container and the other hole is used to allow air to flow into the container.

5 and 6 illustrate lids configured differently according to the principles of the present invention, and are specifically for use in encapsulating a bottle or a food container in a vacuum, and the lid 34 is formed of the copper plate 36 and the protruding portion of the container. The circumferential wall 38 and the folded end 40 are engaged. The lid 34 also has a flexible button that rises up on the copper plate 36 and has two flammable webs 44 near the top of the button. The webs 44 are arched and concave toward the periphery of the lid and there is a connection plate 46 which does not weaken between the two webs. As shown in FIG. 6, the plate between the webs 44 protrudes outward compared to its adjacent both plates.

When opening the container sealed with this stopper 34, pressing the connecting plate 46 inwards will destroy at least one of the webs 44, so that the vacuum in the container is released and when the vacuum is released, the stopper is opened against the container. The stopper will be better off because it can be moved easily. It is thought that movement of the connecting plate 46 causes relative movement to both plates of the web 44 such that a thin bent portion of the web is forced to begin to break.

7 and 8 show a typical tool and method for forming a specially shaped web according to the present invention. These tools assist in shaping the annular upper mold 48 and the lower mold 50, the bendable portion 32, and the raised opening piece 22 between which metal plates are inserted to form the web. It consists of a mold 49 and tools 51 for shaping the raised rounded part that is optionally used.

The upper mold 48 has a flat horizontal bottom surface 52, an inner surface 53 for shaping an opening piece inclined upwardly from the horizontal bottom surface 52, and an angular flat inclined surface 54 for pushing out the metal plate. The inclined surface 54 constitutes approximately 54 ° outward from the horizontal plane. Limited deviation from this angle may be allowed.

The horizontal surface 52 and the inclined surface 54 of the mold 48 form fairly sharp edges 56 with each other to form equally sharp edges on the base wall 10 of the container. The edge 56 formed between the horizontal surface 52 and the inclined surface 54 of the mold preferably has a radius of 0.001 inch or less. However, a radius of up to 0.05 inches is allowed, as the mold for forming webs on aluminum alloy plates between 0.01 inches and 0.015 inches thick, often used for can lids, may wear out.

The lower mold 50 forms a flat horizontal bottom surface, i.e., about 45 ° with the downwardly sloping outer surface 59 and the horizontal surface 58 forming a bent portion 32 on the outer side of the top piece 58 and the opening piece. It consists of a flat inclined surface 60, which serves to push the metal plate, the horizontal surface 58 and the inclined surface 60 forms a fairly sharp edge 62, like the upper frame. The inclined surfaces 54, 60 that push the metal plates of the upper mold and the lower mold 48, 50 are, of course, able to deviate somewhat but are generally side by side. The tool 51 for shaping the dome rises upwards inside thereof, and there is a rounded resurrection 64 so that the opening piece 22 that protrudes therefrom is formed. The auxiliary mold 49 and the tool 51 for forming the dome are each part of the entire mold 48 and 50, but may be separated as shown for convenience of manufacture. However, in the practice of the present invention, it is good to move as one unit.

The tool 51 for shaping the dome is omitted in shaping the inwardly protruding opening piece 22 currently employed. The outer auxiliary mold 49 is disposed on the same side as the upper mold 48 with respect to the container wall 10 and has a horizontal surface 49a which faces the same direction as the horizontal bottom surface 52 of the upper mold 48. It is located sideways away from the horizontal plane 58 of the lower mold (50). Inserting the container wall 10 between the molds 48, 49, 50 and 51 if included and pressing the mold protrudes above the round face 64 of the inner tool 51 which firstly forms the dome. .

As the mold continues to be rolled, the one-sided surface 52 and the inclined surface 54 of the upper mold 48 are linearly moved toward the inclined surface 60 and the horizontal surface 58 of the lower mold 50, respectively. This is a side open position.

The wall of the container is bent at right angles to the original plane by the action of the horizontal planes 52, 58 of the die that sandwiched the vessel plate and pressed the upper die 48. When the horizontal planes 52, 58 are close to 34-23 of the vessel wall 10 thickness, the metal plate is pushed sideways between the inclined planes 54, 60 of the mold. At that moment the vessel wall is deformed around the corners 56, 62 of the mold.

As the molds 48 and 50 come closer, the metal plate is also pressed between the inclined surfaces 54 and 60 and pushed to the side of the web while the container wall 10 is bent almost perpendicular to the original surface.

The linear movement of the upper mold 48 toward the lower mold 50 continues until its horizontal plane 52 is approximately coplanar with the horizontal plane 58 of the lower mold 50.

It is believed that the metal sheet is so pushed sideways from the web that it plays an important role in preventing the web from cracking or breaking before it is fully formed.

Without this pushing action, the container board will be cut by the mold just as the metal plate is cut at the end of the mold before the mold is fully penetrated by the tooling. In the present invention, since the container plate is vertically deformed and the part is pushed to the side when the part is extended laterally, the container plate is not cracked or cut so that the cracked or grooved web is completely removed.

Experience to date has shown that more than about 300 cover plates can be produced every minute in a mold with little or no defects in the high-speed press process in which the present invention is practiced. When the metal plate is pushed to the side of the web, the surface area of the can lid plate is increased to form a bent portion next to the web. As explained above, this bendable portion 32 is believed to promote breakage of the fragile web.

In the tools shown in Figs. 7 to 9, the tool 51 for forming the auxiliary mold 49 and the inner dome controls the direction of the protrusion formed on the lid plate. That is, the bendable part 32 and the raised opening piece 22 protrude out from the original can lid plate. For other uses, can lids may be similarly used, if necessary, to form protrusions and bends on either side of the web that are prone to breakage or, if necessary, on the bottom, i.e., inward. After the tool 51 for forming the dome and the opening piece 22 are raised upwards, the web 24 is formed, the metal plate is pushed to the side, and the metal plate above the domed portion 64 is further raised so that it is shown in FIG. Molded together. The auxiliary mold 49 controls the shaping of the flexible powder 32 protruding outward. That is, the metal plate at the end of the web is restrained so that the metal plate is bent upwards and directed upwards to the bottom mold as shown in FIG. In order to form the bendable part 32, the auxiliary mold 49 is pushed so that its horizontal surface 49a and the horizontal surface 58 of the lower mold 50 are moved to the position where they vertically diverge from their direction of the mold.

When the special type web of the present invention is molded, when the metal plate is pushed to the side, a complex and inexplicable stress is formed in the web, which contributes to the shear force and interacts with the stress generated when the flexible gap is pressed in. It is thought to contribute to destruction. It is clear that this unexplained stress acts in the fragile web to facilitate the onset of failure.

In the present invention, the horizontal distance 거리 X ＂between the edges 56 and 62 depends on factors such as the hardness and thickness of the container plate of the alloy, the thickness of the angular webs of the inclined surfaces 54 and 60, and the remaining thickness. . The horizontal distance is preferably about 1/4 to 1/6 of the thickness of the container plate on which the web is to be molded. In some cases, it may be from 5% to 50% of the thickness of the container plate.

According to an embodiment of the present invention, when forming a web on a container lid plate made of a hard aluminum alloy plate having a thickness of 0.013 inch, the overlapping horizontal distance ＂X＂ of the inclined surfaces 54 and 60 is about 0, OO32 inch. It was the most efficient. In the above embodiment, a thin web about 0.004 inches thick was formed without cracking until the two horizontal planes 52, 58 of the mold were within 0.001 inches.

10 shows a metallic lid of the shape currently used by the principles of the present invention. It is a middle cover plate 12 having one or more round and relatively rigid opening pieces 22, which have a dome-shaped portion 33 inwardly with a rim plate 28 around them and the end being broken. It is bounded by an easy web 24. The edge plate 28 is edge plate 30 of the protruding portion 32 protruding out of the truncated cone which surrounds the opening piece 22 at its adjacent portion of the center lid plate 12 by the web 24. Connected with The upper surface 70 of the rim plate 28 intersects the inclined surface 72 at the inner end of the edge plate 30 of the generally flat and bent portion 32 at the cleft edge 74. The bottom surface 76 of the edge plate 30 is also substantially flat and forms almost the same surface as the top surface 70 of the edge plate 28, and the grain surface 78 at the end of the edge plate of the opening piece 22 and the second fine corner. Intersect at 80. The two edges 74 and 80 are spaced apart at the calculated intervals so that only the web extends laterally. By pressing the flexible part 32 of the container lid 10 by hand and pushing it inwards, the relative position of the edge plate 30 with respect to the edge plate 28 is changed, so as to press the fragile web 24 to Destruction begins and the separated opening piece is pushed inwardly with the container. And the periphery of the edge plate of the separated opening piece becomes larger than the size of the hole drilled in the lid. This hand pressure is preferably applied to the raised edge plate 30 of the lid 10 adjacent the web 24, preferably the bendable portion 32 as shown in FIG. When the bent portion 32 is pressed, the most magnetic substrate 30 moves with respect to the edge plate 28 of the fairly hard opening piece 22, so that the web 24 is pressed and starts to be destroyed. As pointed out above, when the opening piece 22 is relatively hard and can withstand bending and the flexible part 32 is pressed, the web breaks against the edge plate 30 with respect to the edge plate 28 of the opening piece 22. There is enough displacement to produce. The two side edges 74 and 80 limit the thickness of the web so that, even if the internal stresses are altered by handling or using everyday containers, they are above the lowest level to preserve their structural phenomena and are also caused by finger presses. It should be below the maximum that can prevent the destruction by displacement.

Although the mechanical interpretation of this structural action type is not yet clear, it is believed that complex unexplained stress is generated in the fragile web of special shape by the displacement of the metal plate during the forming process. Relative displacements of the pliable areas of the finger pressing inwardly cause more complex stress states on the web, and local breakdown of the web begins with partial interaction with the unexplained stresses in the forming process. It seems to be.

As a result of this, an opening method is improved and a cover plate and a molding method thereof are invented, which has a greater bearing capacity for cracking of the web. The metal plate is bent along the circumference of the web, almost at right angles to the face before deformation, and simultaneously pushed sideways. Since the metal plate is moved upside down at almost the same time as the vertical displacement, the metal plate can be avoided from being cut, so that the bent portion on the lid plate is molded, and the finger is displaced to displace the web.

The present invention relates to a container lid of a hard aluminum alloy plate of high hardness alloy with a thickness of 0.010 inch to 0.015 inch and a hardness of at least 1/4 or more preferably 3/4 or more of which is partially sugared to cure the protective film thereon. Particularly suitable for use as The yield strength of an aluminum alloy plate of 1/4 hardness is generally greater than 1/2 of the same alloy plate of full hardness and will be more than twice that of a fully quenched product.

It is believed that such a hard alloy plate is particularly suitable for use in the present invention, since a material of the hardness described above is required if the edge plate of the bendable portion with respect to the edge plate of the relatively hard opening piece is pressed with a finger to produce a predetermined displacement. . It is also believed that such hard aluminum alloy plates generate more stress when forming the peb and when the metal plate is relatively displaced as described above.

Experience has shown that the radius of the opening is about 1/8 inch to 3/4 inch. It is thought that the inclination of 5 ° to 15 ° C. with respect to can cause a proper toggle action and cause displacement of the magnetic field plate with respect to the edge of the opening piece necessary to cause the web to break.

FIG. 11 shows the present invention having a squeezable opening piece 112 bounded by one or more, preferably two, perforations 114, on a lid of a container of a rigid aluminum alloy or can lid of a material that is susceptible to bottle shape. Another construct of is shown. The opening piece 112 presses it into the inside of the container to puncture the lid plate. A perforation line 114 around the opening piece 112 is formed by bending the metal plate 114 at right angles to the original surface and pressing the metal plate in a narrow area along the line circumference. The cutting line 114 is a ＂c＂ type and the connecting piece 118 at the end where the line meets to play a hinge role to prevent the opening piece 112 from being completely separated from the upper lid plate 110.

The hinge 118 between the two ends of the perforation 114 weakens in shallow gold or similar, but in some cases it is not necessary to do so.

Referring to FIG. 12, the upper surface 116 of the opening piece 112 adjacent to the perforated line 114 is almost flush with the lower surface 117 of the portion adjacent to the protrusion outside the opening piece and is also prone to bend adjacent to the perforated line 114. The protrusion 124 is formed. As will be described later, the protrusion 124 encourages the opening piece 112 to be pressed into the can.

The pressable opening piece 112 is domed downward, as shown in FIG. The downwardly dome-shaped opening piece 112 provides the maximum strength against breakage of the cutting line 114 due to the high pressure inside the container 120, and also the cutting line 114 by the force applied to the outside of the can. This breakthrough provides maximum convenience.

The pressure inside the vessel 110 will first cause a compressive stress on the overlapping metal plate of the perforated line 114 around the inwardly domed opening piece 112 and the metal plate will withstand relatively high compressive stress. However, when an external force is applied to the perforated line 114 of the cover plate 110, various stresses including a few shear stresses are generated in the folded portion, and the combined stresses, especially the shear stresses, are relatively large in size. Destroy the perforations even when enemies

The protruding portion 124 adjacent to the perforated line 114 is bent downward by an external force, so that both plates of the perforated line move to substantially parallel sides to the cover plate, so that a shear force is generated in the remaining metal part of the perforated line.

13 and 14 illustrate another tool used to implement the present invention. These two spheres are vertically movable upper mold 128 and the lower mold 130 of the same type to form a cutting line therein by inserting a metal plate or a lid 132 therebetween.

The tool also has a tool for forming a vertically movable dome and an outer annular mold 134 for forming a protrusion next to the perforation line to determine the direction of the protrusion formed on the lid. While both templates 128 and 134 are shown to be disadvantageous, they may be integral.

14 shows an enlarged view of the molds 129, 130, and 134 of the forming process, the upper mold 128 has a lower horizontal surface 136 and an inner surface inclined upward by about 15 ° from the horizontal surface 136. An inclined surface 140 inclined upwards from 138 and the horizontal surface 136 and a vertical surface 142 extending upward from the outer end of the inclined surface 140 and protruding outward from the top of the vertical surface 142 There is a door with one horizontal plane 144. The lower mold 130 has an upper horizontal surface 146 and an outer surface 148 tilted downward from the horizontal surface 146 and an inclined surface 150 tilted about 45 ° downward from the horizontal surface 146 and the ends of the sloped surface 150. Is a vertical plane 152 extending downwardly and a horizontal plane 154 projecting lightly below the vertical plane.

Since the inclined surfaces 140 and 150 of the two molds 128 and 130 are generally parallel to each other and overlap each other in the horizontal direction, when the mold is closed, a narrow area of the metal plate 132 sandwiched therebetween is compressed and pushed to the side. Preferably, the metal plate 132 is pushed to the side to form 45 ° with respect to the original surface of the metal plate, and the overlapping amount of the two inclined surfaces 140 and 150 in the horizontal direction is 1/6 to 1/4 of the thickness of the metal plate 132. It is good enough.

The molds 128, 130 illustrated in the figure are so, and the non-planar surfaces 136, 144 of the upper mold 128 facing the two horizontal planes 146, 154 of the lower mold 130 are almost metal plates 132. When the mold is closed because it is spaced up and down by the thickness, the bands highlighted on the metal plate are formed between the part for forming the perforations of the two molds and the two for forming the grooves. As long as the metal plate caught between the protrusion 156 of the bar-shaped mold 134 and the inclined surface 140 of the upper mold 128 is hardly constrained and can be pushed, the exact spacing of these opposing mold surfaces is dependent on the original function of the mold. I do not think it will affect.

Here, the vertical lengths of the two inclined surfaces 140 and 150 of the two molds 128 and 130 are about half the thickness of the metal plate to form the perforated line, respectively. Thus, limiting the height of the inclined surfaces 140 and 150 to about half the thickness of the metal plate removes the bond to the metal plate between the inclined surface 140 and the protrusion 156 to minimize the stress generated in the metal plate when forming the cut line. Therefore, it is thought that the shaping | molding of a tear line is made easy to the metal plate of commercially acceptable thickness.

In addition, the outer mold 134 has a protrusion 156 to form a groove in the adjacent portion of the cut line formed by the upper mold 128 and the lower mold 130. The protruding portion 156 may be a slug or other shape as shown in FIG. 14, and presses the metal plate together with the mold 130 below. Although not readily known, when the metal plate is pressed between the protruding portion 156 and the outer surface 148 of the lower mold 130, the metal plate is pressed in advance to form a cutout line in the metal plate 132. It is thought that the stress generated by 130 is suppressed.

The vertical height of the protrusion 156 from the underside 158 of the outer molds 134 is preferably about 1/4 to 3/4 of the thickness of the metal plate 132. In addition, the radius of the protrusion 156 is set to be 0.005 inches, 0.0075 inches, 0.010 inches, etc. to form the cut line on the aluminum alloy plate having a large hardness of 0.012 inches. The distance between the protrusion 156 and the cut line to be formed may be one to three times the thickness of the metal plate 132.

Operation of the molds 128, 130, 134 for forming the perforations on the lid plate or the metal plate according to the present invention is to insert the metal plate 132 between the molds as shown in Figure 13 and two molds (128, 134) 읖 to press the lower mold 130 at a time to deform the metal plate sandwiched between.

The two horizontal planes 136, 146 of the upper and lower dies 128, 130 bend the metal plate 132 therebetween at substantially right angles to thin the portion. When the two horizontal surfaces 136, 146 of the mold are engaged within about two thirds to three quarters of the thickness of the metal plate 132, the metal plates begin to push sideways from between the two inclined surfaces 140, 150 of the mold.

This lateral push of the formed tear line occurs almost simultaneously with the completion of the perpendicular displacement, thereby preventing the metal plate from being cut between the molds. When the ratio of the side of the metal plate is pushed at the right angle and the ratio of the right side of the metal plate is less likely to be cut by the right angle displacement.

The protruding portion 156 of the outer mold 134 makes the adjacent portion of the cutting line piercing to form the cutting line while being cut to the metal plate 132. The groove of the metal plate is pressed between the protrusion 156 and the mold surface 148 so that the metal plate of the portion is pressed and pushed to the side of the protrusion.

The mill is directed towards the cut line where about half of the amount is molded. This push of the metal plate toward the perforated line is thought to suppress the stress in the perforated line that may cause the break of the perforated line in the process of forming the perforated line or accident.

In order to make a groove around the perforation line, the two horizontal planes 136 and 146 of the two molds 128 and 130 have to be shredded to a position where they are almost the same plane, so that even a metal plate thinner than the process standard thickness is formed between the molds without thinning . Without this grooving action, undesired cracks or grooves are likely to form in the cutout portion formed when the two upper and lower horizontal surfaces are closed to form the same plane.

In Fig. 14, only one side of the perforated line is provided with a groove, but such a groove may be made on both sides of the perforated line or may be made on the opposite side of the case of Fig.

In addition, instead of the outer mold 134, the protrusion 156 for forming the groove may be included in the lower mold 130, and the cross-sectional shape of the groove may also be varied. A perforation line is formed in the metal plate 132 by the upper and lower molds 128 and 130. The vertical plane 142 and the upper horizontal plane 14 of the upper mold 128 and the vertical plane 152 and the lower horizontal plane 154 of the lower mold 130 are formed. The ups and downs between the two sides move the metal plate on both sides of the ups and downs to provide a place for the metal plate to move. This also minimizes the stress on the metal plate when the cutout is molded. The mold for bending the front metal plate at right angles and pushing it to the side also has side surfaces similar to the two inclined surfaces 140 and 150 of the two molds 128 and 130, but they are at an inclination of about 15 ° and are larger than the thickness of the metal plate to be cut off. Stretched out. The ups and downs of the molds 128 and 130 of the present invention are thought to reduce the amount of movement of the metal plate due to the molds, thereby reducing the stress generated in the cut line.

Due to this reduced stress of the metal plate it can be formed quite thinly so that the tear line can be broken very well.

The pressable opening pieces formed by the action of the molds 128, 130, and 134 form a dome shape inward.

When the perforations are molded, the metal plate in that portion becomes thinner, so that the surface area of the metal plate is increased, and the increased surface area is defined by the perforation line, so that the increased surface area is pushed back to form an inwardly curved dome in the opening piece. As mentioned earlier, these inwardly domed shapes are suitable for use in vessels with pressures above atmospheric pressure. This is because these molds are strong against attempting to break the tear line by the internal pressure of the vessel and are very well destroyed by the external force applied to the vessel.

Of course, for other applications, you can do the dome shape.

15 and 16 illustrate a template of another method that can be used to form a cutout on a metal plate or other susceptible material. The grooved form illustrated in FIGS. 13 and 14 is preferably used as illustrated in FIGS. 15 and 16. The molds 160, 162 illustrated in FIG. 15 also have faces 163, 164, 165, 166 similar to those of the FIG. 13 mold and faces 167, 168 tilted about 10 ° relative to the vertical plane and the upper mold. 160 has a face 169 having an angle of about 45 ° with respect to the horizontal plane. Surface 169 is well above surface 163, allowing the metal to curl well between the perforated line and the groove.

Forms 170 and 172 illustrated in FIG. 16 have curved surfaces 174 and 176 curved from horizontal planes 178 and 180.

In order to shape the tear line of the present invention, other various forms of mold may also be used.

For example, the corners 182 and 184 of the 16th mold 170 and 172 or the corners of the mold illustrated in FIGS. 14 and 15 may be slightly rounded.

FIG. 17 illustrates another tool having up and down molds 186 and 168 and another mold 190 for forming a cutout line in a metal plate. The flat lower face 194 of the mold 190 is parallel to the face 192 of the mold 188 below. The mold faces 192 and 194 are tilted about 15 ° with respect to the original horizontal metal plate 188 so that the metal plate formed therebetween also forms such an angle. The upper mold 186 and the outer mold 190 may appear to be separated, but they may be integrated. In the state in which the molds 186, 188 and 190 are closed, the spacing between the mold surfaces 192 and 194 may be similar to the thickness of the metal plate. However, the two molds 188 and 190 may be closed to the extent that the metal plate is pressed between the mold faces 192 and 194. In addition, near the cut line to be molded, the mold faces 192 and 194 are further adjacent to each other so that the metal plate sandwiched therebetween is pressed and pushed toward the cut line when the mold is closed. Since the stress generated in the metal waves is suppressed by the action of pressing and pushing the metal plate in this way, it is considered that a perforated line can be formed on the metal plate.

Although only a few examples of the embodiments of the present invention have been shown and described, it will be appreciated that variations of the container lid, the molding method thereof and the molding apparatus of the present invention will be possible without departing from the principles and claims of the present invention. . For example, the molds used to groove or crimp metal sheets do not have to move integrally with the tool for forming the perforations. Instead, the grooved mold may be placed on the face of the lid metal plate to move the mold forming the tear line. In addition, the present invention may be used to mold various shapes of perforations to lids or can lids or various kinds of sheet materials that are easily deformed.

Claims (1)

An opening piece having at least one part which is hard enough in comparison with the inflexible bent and the bent part adjacent thereto, protruding out from and surrounding the container component adjacent to the web, as shown in the figures and described above in the text, When the inward pressure is applied with a finger, the relative position between the inner economic edge and the peripheral edge changes, so that the web is subjected to a force to start breaking, so that the bent portion changes the position of the separated opening inward. Internal economic edges and ends of the wall with one or more openable opening pieces and the adjacent wall portions of the exposed edges, with the main part defining a separation position of the opening piece from the portion adjacent to the wall by a fragile web. This includes the intersecting top face A metal thin plate container having a peripheral edge portion of the opening piece.

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