201022093 六、發明說明： 【發明所屬之技術領域】 本發明係指一種呈現具有一自由上緣及設計成摩擦地安 置且轴向地保持在由界定在該罐之一上方開口内之一座内 部之一周邊側壁之類型的金屬蓋，在其中央區域該蓋可選 擇性地具有一用以接收一通常係一透明塑膠材料的輔助蓋 之檢查開口。 【先前技術】 以上提到類型之金屬蓋係眾所周知的。其係以一單件式 金屬薄片所形成及包括一通常圓盤形的底壁，合併一側壁 之該底壁的周邊邊緣向上突出，以便可移除地壓入配合及 轴向地保持在一界定在一罐之一上方開口内之座内部。該 座可藉由一懸垂管狀突出物界定，該突出物被高位地合併 至一具有一圓形或多邊形橫截面之一罐之上壁之中央開 Ο 〇 以上提到類型之金屬蓋在美國專利第2 〇74 23丨號、第 3,347,4〇8號、巴西專利第8002622-2號、第8002618-4號及 亦在巴西專利第9408643-5號及第601221-2號中被描述及績 示’求後兩個專利属於本發明專利申請之同一申請者。 在此等先前技術結構中，蓋結構僅包括底壁及一周邊側 壁’界定在罐之上方開口内的在座内之蓋之軸向保持力經 常藉由至少提供在上方開口内的蓋側壁及座之部件之一之 接合構件實現，以便與其他該等部件協作。 在以上引用類型之結構中，即使當蓋之底壁呈現一拉長 141728.doc -4- 201022093 或&出的中間部分時’正如在巴西專利第76〇122ι·2號及 美國專利第3,347,4-8號中揭示的方案中所教示，當閉合力 被施加時，需要對蓋結構採取一定的小心處理，因為該閉 合力可能會永久性地破壞該蓋，而使得該罐無法得到一緊 密且牢固的關閉。 以上提到的結構缺陷係由於以下事實，即該蓋結構不呈 現保證在具有一外環形凹口之金屬蓋内之通常的周邊強201022093 6. INSTRUCTIONS OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention is directed to a device having a free upper edge and designed to be frictionally disposed and axially retained within a seat defined by an opening in one of the cans. A metal cover of the type of a peripheral side wall, in the central portion thereof, the cover optionally has an inspection opening for receiving an auxiliary cover of a generally transparent plastic material. [Prior Art] Metal caps of the type mentioned above are well known. Formed by a one-piece foil and comprising a generally disc-shaped bottom wall, the peripheral edge of the bottom wall incorporating a side wall projects upwardly for removably press fit and axial retention Defining the interior of the seat within the opening above one of the cans. The seat may be defined by a depending tubular projection which is joined in a high position to a central opening of a tank having a circular or polygonal cross section. The metal cover of the above mentioned type is in the U.S. patent. No. 2, No. 4, No. 23, No. 3, 347, No. 8, No. 8, No. 8002622-2, No. 8002618-4, and also in Brazilian Patent Nos. 9408643-5 and No. 601221-2 The latter two patents belong to the same applicant of the present patent application. In such prior art structures, the cover structure includes only the bottom wall and a peripheral side wall. The axial retention of the cover in the seat defined in the upper opening of the can is often provided by at least the cover side wall and seat provided in the upper opening. The engagement members of one of the components are implemented to cooperate with other such components. In the structure of the above-referenced type, even when the bottom wall of the cover exhibits an elongated portion of 141728.doc -4- 201022093 or & the middle portion is as in the Brazilian Patent No. 76〇122ι. 2 and the US Patent No. 3,347 As taught in the solution disclosed in No. 4-8, when the closing force is applied, it is necessary to take some care to the cover structure, because the closing force may permanently damage the cover, so that the can cannot obtain a Tight and firm closure. The structural defects mentioned above are due to the fact that the cover structure does not appear to guarantee a strong peripheral strength in a metal cover having an outer annular recess.
度，該等金屬蓋通常有-具有―實質上梯形及倒轉形狀的 橫截面’ $了摩擦地岐在-具有—互補性橫截面之凹口 之内部，該橫截面界定-結合至一罐本體之環形向上壁之 座，諸如在已知#十年的結構中及其在19〇4年纟張的美國 專利第795,126號中被揭示及繪示β 為了增加已知蓋之結構強度，其僅呈現底壁及—經形成 以安置及軸向保持在罐之—上開口之周邊側壁，提出一建 設性的方案’其在同一申請者之巴西專利申請案第 _5458韻中被揭示及^，根據該中請案，蓋之底壁 包括-周邊環狀部分及一中間部分，該兩個部分藉由一具 有大致呈-倒㈣之環狀肋條部分互連。此先前的結構提 供以-預定之金屬薄片厚度所形成之蓋具有一增加的結構 強度’克服此等已知蓋之缺陷，且不需要增加金屬薄片厚 度。正如在巴西專利第_5458_G號提出@，在底壁内之 環狀肋條部分之規定導致該蓋之—更高的結構強度。 然而’即使在蓋之底壁内合併該環狀肋條部分，對於蓋 之足夠的及牢®的操作行為所需的結構強度仍然需要該 141728.doc 201022093 金屬薄片具有某一最小厚度。 【發明内容】 作為關於先前技術以上揭示之一功能，本發明以其目的 之—係提供一種上述類型之金屬蓋，該蓋在底壁具有環狀 肋條部分且具有可允許該等蓋被結構在具有一減少的厚度 之金屬薄片内之範圍之增加的強度，而不會使該結構強度 減弱至低於用以允許以通常程序來關閉或打開蓋所預期或 所要之結構強度值，且不會產生使該蓋失效的塑性變形之 風險。 此及本發明之其他目的藉由提供一種該類型之金屬蓋被 獲得，該金屬蓋使其底壁包括一鄰近蓋之側壁之周邊環狀 部分、一中間部分及一具有大致呈一倒。形之環狀肋條部 刀，該環狀肋條部分之橫向支腳被低位地及分別地合併至 周邊環狀部分之鄰近邊緣及底壁之中間部分。 根據本發明，底壁之中間部分包括一環形面板及一藉由 軸向階狀部分連接的中央面板，一該環形面板之外周緣 被。併至該環狀肋條部分之鄰近支_，該#向階狀部分由 種材料組成，该材料從該鄰近的環形面板部分及從該中 央面板部分塑性變形。 μ 隨著在以上—般地界定的結構，除了中間部分及罐之底 壁之周邊環狀部分藉由該環狀肋條部分被相互 外，中間内5八 〜f貫 B °为在其徑向地中間區域内合併轴向階部，該軸 向階。p界疋合併至底壁及與該蓋之側帛間 構元件。 尺夕的結 141728.doc 201022093 輔助轴向階部之提供以及額外的環狀肋條部分之提供給 予该蓋一實質上大於由以上提到的先前技術結構實現的結 構強度之結構強度，其允許獲得具有足夠結構強度及以一 較】厚度之金屬薄片形成之蓋，亦即，具有較少的材料消 • 耗。 ，此外，本發明之蓋物件的結構係可被製成使得底壁之中 間。p刀之中央面板呈現一界定一座之檢查開口，該座用於 安置及轴向地保持一係一透明塑膠材料的辅助蓋。 ® 【實施方式】 本發明將在以下參考所附圖式而以本發明之蓋的可能結 構之實例之方式被描述。 正如在所附圖式中繪示的，本發明之蓋被施加於一罐 10，該罐僅藉由其側壁11之上部分來示意性地繪示，且該 蓋通常藉由一雙接合12而附接於該罐之上部邊緣，以及一 環形上壁13之一周邊邊緣在其中間區域被提供一開口 14以 φ 為了其邊緣結合一懸垂管狀突出物15,該突出物15界定一 用於固定該罐之蓋之座部「S」。 在圖式之圖1例示的先前技術結構及本發明申請案之申 請者之巴西專利第9408643-5號之物件中，懸垂管狀突出 物15具有一向開口 14之内部、及向懸垂管狀突出物。之上 面及對著懸垂管狀突出物15彎曲之較低端部分，為了形成 一連續的管狀肋條16,其通常具有一圓形，正如在先前技 術專利中描述的。 然而，應瞭解的係罐10之環形上壁13之懸垂管狀突出物 141728.doc 201022093 15之結構可具有不同的結構配置，正如在以上提到的先前 技術文件中繪示及討論的，沒有該等結構的修飾而改變本 發明之結構及功能目的。 正如在之前已經提到的，本發明之蓋2 〇係形成於一單件 式金屬薄片中，包括一通常以一呈平坦圓盤形式之底壁21 及其南位地及周邊地合併一具有一自由上緣22a之侧壁22 及其經設計成摩擦地安置及轴向地保持在座部「s」内 郤’該座係藉由提供在環形上壁13内之開口 μ之懸垂管狀 突出物15予以界定。 在圖式所繪示的例示性結構中，蓋2〇使其側壁22具有一 連續的周邊凹口 22b，在其内部係密封地安置及軸向地保 持有懸垂管狀突出物15之連續的管狀肋條16。 在繪示的結構中，懸垂管狀突出物15之連續的管狀肋條 16及蓋20之側壁22之連續的周邊凹口 22b皆呈現_至少部 分圓形或互補性的輪廓，使得該等部件之相互安裝不僅提 升在罐10之開口 14内之蓋20之軸向保持，還提升在此摩擦 固定區域内之一密封效果。然而，應瞭解的係，連續的管 狀肋條16及連續的周邊凹口 22b可呈現不同於在圖式中所 緣示的管狀圓形之組態，正如能在本發明描述之開始之引 用的先前技術文件中觀察到的。 仍然根據在圖式中所繪示的實施例，蓋2〇使其自由上緣 22a向外地、向下地變曲且抵於該侧壁22，以界定一位於 罐10之環形上壁i3上之管狀上部肋條22c，在包圍開口 u 的區域内。因此，應瞭解的係，蓋2〇之側壁22之自由上緣 141728.doc 201022093 22a此呈現不同的結構形式，正如在之前引用的先前技術 文件中繪示#，不需要該等蓋20之㈣壁22之上部區域之形 式及配置的修飾而改變本文提出的本發明之功能特性。 根據本發明，蓋20之底壁21包括一鄰近側壁22之周邊環 * 狀#刀23，一中間部分24及一呈現一具有大致呈一倒ϋ形 、 狀之橫截面的環狀肋條部分25，該底壁之橫向支腳被低位 地及各自地結合至周邊環狀部分23之鄰近邊緣及底壁21之 中間部分24。 # 環狀肋條邛刀25與蓋20之剩餘部分共同地被衝壓，以較 佳地從周邊環狀部分23及從底壁21之中間部分24向上突 出，裱狀肋條部分25以一適當的距離與該側壁22保持隔 開，以在將該蓋安裝於罐10之開口 14後，可對該蓋2〇之邊 緣區域提供必需的結構強度，以抵抗被施加在蓋2〇上的壓 力。 仍然根據較佳的實施例，底壁21之中間部分24係相對於 φ 一含有該底壁21之周邊環狀部分23之平面設置於一較高的 平面内。此結構的配置允許底壁21之中間部分24與環狀肋 條部分25共同地操作，以在堆疊該等蓋在一自動封罐機之 一蓋供給裝置後，界定安置構件以放置一蓋在另一個上， 或在該等蓋被雙接合至罐1〇之侧壁丨丨前，允許該等蓋2〇被 自動地安裝在各自的環形上壁13内。 環狀肋條部分25被進一步架構及製訂尺寸，其方式係以 被設置成低於一含有蓋20之側壁22之自由上緣22a之平面 Ps來達成’此蓋部件之相對尺寸係基於在上述引用且討論 14I728.doc -9- 201022093 之巴西專利0405458-0中的堆疊特性而被製成。 根據本發明，底壁21之中間部分24包括一通常平坦狀的 環形面板24a，該面板24a具有一被合併至環狀肋條部分乃 之鄰近橫向支腳之外部周邊邊緣及一内部周邊邊緣，該内 部周邊邊緣藉由一軸向階狀部分24c結合至一中央面板24b 之一外部周邊邊緣，該中央面板通常亦係平坦的及後者設 置在一稍微咼於該環形面板24a之平面的平面内。 為了使具有轴向階狀部分24c之蓋20能由一具有與用於 製造圖1中所界定的蓋之所需的尺寸相同的尺寸及具有環 狀肋條部分25之金屬薄片坯料形成，轴向階狀部分24c係 由一從該鄰近的環形面板部分24a及從該中央面板部分24b 被塑性變形之材料組成。 軸向階狀部分24c之提供對蓋2〇(尤其係其底壁2丨）之結構 強度增加一充分的程度，以允許可縮減該蓋之金屬薄片之 通常厚度，而不會使蓋之結構強度達到藉由該蓋對罐之正 確且牛固的關閉及打開操作所無法接收或有害的程度。 在圖2及3繪示的實施例中，中央面板24b被完全地關閉 且無任何開口，該中央面板24b具有一相當於大約兩倍環 形面板24a之徑向寬度rl之半徑r。 轴向階狀部分24c之高度應該僅足夠產生增加蓋2〇之結 構強度之理想的效果，通常具有一近似等於用於形成蓋2〇 之金屬薄片之厚度的值，使得用於形成蓋之材料在蓋之衝 壓操作過程中完全從該鄰近的環形面板部分24a及從該中 央面板部分24b塑性變形而成的材料產生。 141728.doc 201022093 在圖4、5及6繪示的第二實施例中，蓋2〇之中間部分24 之中央面板部分24b結合複數個徑向延伸部24d ’且與該中 央面板部分24b共面的及其延伸直至該環狀肋條部分乃之 鄰近橫向支腳被結合。在繪示的實施例中，徑向延伸部 24d在數目上係四個，但可在此數目或多或少地改變。然 而，理想的係該等徑向延伸部24d相等地及有角度地相互 間隔。進一步可衝壓蓋2〇,以允許中央面板部分24b之徑Degrees, the metal caps typically have a cross-section having a "substantially trapezoidal and inverted shape". The frictional mantle is inside the notch having a complementary cross section, the cross section defining-bonding to a can body The seat of the ring-shaped upper wall is disclosed and illustrated in U.S. Patent No. 795,126, the disclosure of which is hereby incorporated by reference in its entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire Presenting a bottom wall and a peripheral wall formed to be placed and axially held in the upper opening of the can, and a constructive solution is proposed, which is disclosed in the same applicant's Brazilian Patent Application No. 5458. According to the present application, the bottom wall of the cover includes a peripheral annular portion and an intermediate portion interconnected by a portion having an annular rib portion having a substantially inverted (four) shape. This prior structure provides that the cover formed with a predetermined thickness of the foil has an increased structural strength' to overcome the drawbacks of such known covers and without the need to increase the thickness of the foil. As proposed in the Brazilian Patent No. 5458_G, the provision of the annular rib portion in the bottom wall results in a higher structural strength of the cover. However, even if the annular rib portion is incorporated in the bottom wall of the cover, the structural strength required for sufficient and secure operation of the cover still requires the 141728.doc 201022093 foil to have a certain minimum thickness. SUMMARY OF THE INVENTION As a function of one of the prior art disclosed above, the present invention is directed to a metal cover of the above type having an annular rib portion on the bottom wall and having a structure that allows the cover to be The increased strength of the range within the foil having a reduced thickness without compromising the strength of the structure below the structural strength values expected or desired to allow the lid to be closed or opened in the usual procedure, and not There is a risk of plastic deformation that would invalidate the cover. This and other objects of the present invention are obtained by providing a metal cover of the type having a bottom wall including a peripheral annular portion adjacent the side wall of the cover, a middle portion and a substantially inverted portion. The annular rib portion of the annular rib portion is joined to the intermediate portion of the adjacent edge and the bottom wall of the peripheral annular portion in a low position and separately. According to the invention, the intermediate portion of the bottom wall includes an annular panel and a central panel joined by axially stepped portions, a peripheral edge of the annular panel being received. And adjacent to the annular rib portion, the #-step portion is composed of a material that is plastically deformed from the adjacent annular panel portion and from the central panel portion. μ With the above-defined structure, except for the intermediate portion and the peripheral annular portion of the bottom wall of the can by the annular rib portion being external to each other, the middle portion is in the radial direction The axial section is merged in the intermediate portion of the ground, the axial step. The p boundary is merged into the bottom wall and the side interfacial components of the cover. The knot of the rule 141728.doc 201022093 The provision of the auxiliary axial step and the provision of the additional annular rib portion give the cover a structural strength substantially greater than the structural strength achieved by the prior art structure mentioned above, which allows to obtain A cover having sufficient structural strength and formed by a relatively thin metal foil, i.e., having less material consumption. Further, the structure of the cover member of the present invention can be made such that the bottom wall is intermediate. The central panel of the p-knife presents an inspection opening defining a seat for holding and axially retaining an auxiliary cover of a series of transparent plastic materials. ® [Embodiment] The present invention will be described below with reference to the accompanying drawings in an example of a possible structure of the cover of the present invention. As illustrated in the drawings, the cover of the present invention is applied to a can 10 which is schematically depicted only by the upper portion of its side wall 11, and which is typically joined by a pair of 12 Attached to the upper edge of the can, and a peripheral edge of an annular upper wall 13 is provided with an opening 14 at its intermediate portion for φ to engage an overhanging tubular projection 15 for its edge, the projection 15 defining a Fix the seat "S" of the lid of the can. In the prior art structure illustrated in Fig. 1 of the drawings and in the article of the Brazilian Patent No. 9408643-5, the applicant of the present application, the overhanging tubular projection 15 has an interior of the opening 14 and a depending tubular projection. The upper end and the lower end portion opposite the curved tubular projection 15 are curved to form a continuous tubular rib 16 which generally has a circular shape as described in the prior art patent. However, it should be understood that the structure of the overhanging tubular projections 141728.doc 201022093 15 of the annular upper wall 13 of the canister 10 can have different structural configurations, as illustrated and discussed in the prior art documents mentioned above, without this Modifications of the structure alter the structure and function of the invention. As already mentioned before, the cover 2 of the present invention is formed in a one-piece metal foil, comprising a bottom wall 21, usually in the form of a flat disk, and a combination of the south and the periphery. The side wall 22 of a free upper edge 22a and its overhanging tubular projection which is designed to be frictionally disposed and axially retained within the seat "s" but which is provided by the opening μ provided in the annular upper wall 13 15 is defined. In the exemplary configuration illustrated in the drawings, the cover 2 has its side wall 22 having a continuous peripheral recess 22b, a tubular tubular member disposed therein and axially retaining a continuous tubular shape of the depending tubular projection 15. Ribs 16. In the illustrated construction, the continuous tubular ribs 16 of the depending tubular projections 15 and the continuous peripheral recesses 22b of the side walls 22 of the cover 20 all exhibit an at least partially circular or complementary contour such that the components are mutually The mounting not only enhances the axial retention of the cover 20 within the opening 14 of the can 10, but also enhances one of the sealing effects in this frictional fastening region. However, it should be understood that the continuous tubular ribs 16 and the continuous peripheral recesses 22b may exhibit a configuration other than the tubular circular shape shown in the drawings, as previously described at the beginning of the description of the present invention. Observed in the technical documentation. Still according to the embodiment illustrated in the drawings, the cover 2 has its free upper edge 22a deflected outwardly and downwardly against the side wall 22 to define an annular upper wall i3 of the can 10 The tubular upper rib 22c is in the region surrounding the opening u. Therefore, it should be understood that the free upper edge 141728.doc 201022093 22a of the side wall 22 of the cover 2 is presented in a different structural form, as indicated in the prior art document cited above, without the need for the cover 20 (four) Modifications in the form and configuration of the upper portion of wall 22 alter the functional characteristics of the invention presented herein. In accordance with the present invention, the bottom wall 21 of the cover 20 includes a peripheral ring-shaped knife 23 adjacent the side wall 22, an intermediate portion 24 and an annular rib portion 25 having a generally inverted cross-sectional shape. The lateral legs of the bottom wall are joined to the adjacent edges of the peripheral annular portion 23 and the intermediate portion 24 of the bottom wall 21 in a low position and respectively. The annular rib trowel 25 is stamped together with the remainder of the cover 20 to preferably project upwardly from the peripheral annular portion 23 and from the intermediate portion 24 of the bottom wall 21, the ribbed portion 25 being at an appropriate distance The side wall 22 is spaced apart to provide the necessary structural strength to the edge region of the lid 2 after the lid is mounted to the opening 14 of the can 10 to resist the pressure exerted on the lid 2 . Still in accordance with a preferred embodiment, the intermediate portion 24 of the bottom wall 21 is disposed in a relatively high plane relative to the plane of the φ-containing peripheral annular portion 23 of the bottom wall 21. The configuration of this structure allows the intermediate portion 24 of the bottom wall 21 to operate in conjunction with the annular rib portion 25 to define a seating member to place a cover upon stacking the lids after a cover supply device of one of the automatic can sealing machines One, or before the covers are double joined to the side walls of the can 1 , allow the covers 2 to be automatically mounted within the respective annular upper walls 13 . The annular rib portion 25 is further constructed and dimensioned in such a manner as to be disposed below a plane Ps containing the free upper edge 22a of the side wall 22 of the cover 20 to achieve the relative dimensions of the cover member based on the above reference It is also made to discuss the stacking characteristics of Brazilian Patent No. 0405458-0 of 14 I728.doc -9- 201022093. In accordance with the present invention, the intermediate portion 24 of the bottom wall 21 includes a generally flat annular panel 24a having an outer peripheral edge and an inner peripheral edge that are joined to the annular rib portion adjacent the lateral legs. The inner peripheral edge is joined to an outer peripheral edge of a central panel 24b by an axial stepped portion 24c which is also generally flat and which is disposed in a plane slightly offset from the plane of the annular panel 24a. In order to enable the cover 20 having the axial stepped portion 24c to be formed from a sheet metal blank having the same dimensions as the one used to fabricate the cover defined in Fig. 1 and having an annular rib portion 25, the axial direction The stepped portion 24c is composed of a material that is plastically deformed from the adjacent annular panel portion 24a and from the central panel portion 24b. The provision of the axial stepped portion 24c increases the structural strength of the cover 2 (especially the bottom wall 2 thereof) to a sufficient extent to allow the usual thickness of the metal foil of the cover to be reduced without the structure of the cover The strength is such that it is unacceptable or detrimental by the correct and sturdy closure and opening operation of the lid to the can. In the embodiment illustrated in Figures 2 and 3, the central panel 24b is completely closed and has no openings, and the central panel 24b has a radius r corresponding to approximately the radial width rl of the annular panel 24a. The height of the axial stepped portion 24c should only be sufficient to produce the desired effect of increasing the structural strength of the cover 2, typically having a value approximately equal to the thickness of the metal foil used to form the cover 2, such that the material used to form the cover Material is produced entirely from the adjacent annular panel portion 24a and the material from which the central panel portion 24b is plastically deformed during the stamping operation of the cover. 141728.doc 201022093 In the second embodiment illustrated in Figures 4, 5 and 6, the central panel portion 24b of the intermediate portion 24 of the cover 2 is joined to a plurality of radially extending portions 24d' and coplanar with the central panel portion 24b. And extending until the annular rib portion is joined adjacent to the lateral legs. In the illustrated embodiment, the radial extensions 24d are four in number, but may vary more or less in this number. However, it is desirable that the radial extensions 24d are equally and angularly spaced from one another. Further stamping the cover 2 to allow the diameter of the central panel portion 24b
向延伸部24d被設置在一稍微轴向位移於該中央面板部分 24b之平面的平面内。 在圖7及8繪示的實施例中，中央面板部分24b具有一徑 向地與軸向階狀部分24c間隔的檢查開口26，其界定一用 於固定及轴向保持-辅助蓋30之-周邊側壁31係一透明塑 膝材料之座，該檢查開σ26包括—懸垂裙㈣，該裙㈣ 形成以結合一内部圓周肋條28’該肋條28被固定在提供在 該輔助蓋30之周邊側壁31内之—對應的圓周凹口加。檢 查開口26及輔助蓋3G之結構能符合應料蓋20之相同的行 保持所涉及部件之尺寸成比例地適合輔助蓋30之最小The extension portion 24d is disposed in a plane that is slightly axially displaced from the plane of the center panel portion 24b. In the embodiment illustrated in Figures 7 and 8, the central panel portion 24b has an inspection opening 26 radially spaced from the axial stepped portion 24c defining a fixed and axial retention-auxiliary cover 30 - The peripheral side wall 31 is a seat of a transparent plastic knee material, and the inspection opening σ26 includes a hanging skirt (four) formed to incorporate an inner circumferential rib 28' which is fixed to the peripheral side wall 31 provided on the auxiliary cover 30. Inside - the corresponding circumferential notch is added. The structure of the inspection opening 26 and the auxiliary cover 3G can conform to the same row of the material cover 20, and the size of the components involved is proportionally adapted to the minimum of the auxiliary cover 30.
直徑。應瞭解的係中I 、面板2 4 b之徑向延伸部2 4 d在此情形 〒亦係環形的，亦可担# 耳了 k供在圖7及8繪示的實施例中。 在圖式繪示的實施例 21夕一… 周邊環狀部分23及蓋2〇之底壁 21之中間部分24係呈平㈣@。 儘管僅在本文中繪示一 姓 ^ —、息之結構形式以及一座社 構，然而應瞭解的係， 座>·、。 明說明書之請求項巾A切在不偏離附本發 中界疋的結構概念下做出變更。 14] 728.doc 201022093 【圖式簡單說明】 圖1顯示一罐之上部區域之一部分徑向截面圖，在其中 卸料端開口被固定在一根據已知先前技術方案之一結構的 蓋中； 圖2顯示一在圖i繪示的類型之一蓋之俯視平面圖，但結 合根據本發明之一第一實施例之軸向階部； 圖3顯示蓋之一部分徑向截面圖，當安裝在一罐之卸料 端開口時，該圖係沿圖2中的線ΙΙΙ ΙΠ所截取； , 圖4顯示-在圖2繪示的類型之一蓋之俯視平面圖，但結 合根據本發明之-第二實施例之中央面板之徑向延伸部、 圖5及6顯示當安|在一罐之卸料端開口時該蓋之部分押 向截面圖，該等圖分別沿圖4中之線V-V及⑽所截取， 圖7顯示-本發明之蓋之—第三實施例之俯視平面圖 請示當安裝在-罐之卸料端開口時蓋之一及 截面圖’㈣係沿圖7中之物π.ν戦截取。 4 【主要元件符號說明】 10 罐 11 側壁 12 雙接合 13 環形上壁 14 開口 15 管狀突出物 16 管狀肋條 20 蓋 141728.doc 201022093 21 底壁 22 側壁 22a 自由上緣 22b 周邊凹口 . 22c 管狀上部肋條 23 周邊環狀部分 24 中間部分 24a 環狀面板 ® 24b 中央面板 24c 軸向階狀部分 24d 徑向延伸部 25 環狀肋條部分 26 檢查開口 27 邊緣 28 内部圓周支撐 30 輔助蓋 31 周邊側壁 33 圓周凹口 Ps 平面 ' S 座部 RL 徑向寬度 R 半徑 141728.doc 13·diameter. It should be understood that the radial extensions 4 4 d of the I, panel 2 4 b are also annular in this case, and can also be used in the embodiments illustrated in Figures 7 and 8. In the embodiment shown in the drawings, the peripheral portion 22 and the intermediate portion 24 of the bottom wall 21 of the cover 2 are flat (four)@. Although only a surname ^ -, a structural form of interest, and a community are shown in this article, the system should be understood, the seat > The request item A of the specification is changed without departing from the structural concept of the boundary. 14] doc. 201022093 [Simplified illustration of the drawings] Figure 1 shows a partial radial cross-sectional view of a can upper region in which the discharge end opening is fixed in a cover according to one of the known prior art solutions; Figure 2 shows a top plan view of a cover of the type illustrated in Figure i, but in conjunction with an axial step according to a first embodiment of the present invention; Figure 3 shows a radial section of a portion of the cover, when mounted in a When the discharge end of the can is opened, the figure is taken along the line 图 in FIG. 2; FIG. 4 shows a top plan view of one of the types shown in FIG. 2, but in combination with the second according to the present invention. The radial extension of the central panel of the embodiment, FIGS. 5 and 6 show a partial oblique cross-sectional view of the cover when the discharge end of the can is opened, the figures are along the lines VV and (10) of FIG. 4, respectively. Figure 7 shows a top plan view of the third embodiment of the present invention. The cover and the sectional view '(4) are attached to the object π.ν in Fig. 7 when installed at the discharge end of the can.戦 Intercept. 4 [Main component symbol description] 10 can 11 side wall 12 double joint 13 annular upper wall 14 opening 15 tubular protrusion 16 tubular rib 20 cover 141728.doc 201022093 21 bottom wall 22 side wall 22a free upper edge 22b peripheral notch. 22c tubular upper part Rib 23 peripheral annular portion 24 intermediate portion 24a annular panel® 24b central panel 24c axial stepped portion 24d radial extension 25 annular rib portion 26 inspection opening 27 edge 28 inner circumferential support 30 auxiliary cover 31 peripheral side wall 33 circumference Notch Ps Plane 'S Seat RL Radial Width R Radius 141728.doc 13·