Closure lid with at least one circumferential recess in the outside of the side wall

Abstract

Cover (1) for a bore (B) which has an inner diameter (D B ), wherein the closure lid (1) is pot-shaped and has a bottom wall (1b) and a side wall (1s) formed thereon, wherein the side wall (1s) has a lower circumferential region (1su) and an upper circumferential region (1so), wherein a transition region (1sü) is arranged between the upper and the lower region (1su, 1so), characterized in that the outer diameter (D2) of the upper end (OE) of the lower region (1su) adjacent to the transition region (1sü) is smaller than the outer diameter (D1) of the lower end (UE) of the upper region (1so) adjacent to the transition region (1sü), wherein the outer diameter (D2) is larger than the inner diameter (D B ) of the bore (B), and that the side wall (1s) has at least one circumferential recess (20) on the outside of its upper region (1so).

Description

The present invention relates to a closure cap for a bore according to the preamble of claim 1A closure cover 1 of the generic type is known from DIN 443 and is shown in FIGS. 1 and 1 ain its original shape in which it has not yet been introduced in a clamping manner into the bore B. It has outwardly curved bottom wall 1b and a slightly conical side wall 1s formed thereon. The closure cover 1 is produced by deep drawing a sheet metal. The bottom wall 1 bis bent upwards at its outer edge 3 and merges seamlessly into the side wall 1 s, which can be conical (angle φ) or cylindrical. The closure cover known from DIN 443 is generally gripped by a suction gripper 10, 11 which engages the interior I of the closure cover 1 with its tip 13. The suction gripper 10 has a central channel 11 in which a negative pressure can be generated as soon as the tip 13 of the suction gripper 10 bears against the inner side I of the bottom wall 1 b. Due to the curved outer shape of the bottom wall 1 b, the closure cover 1 cannot rest on a support surface in a completely planar manner and thus possibly obliquely. This must also be taken into account in the dimensioning of the diameter of the tip 13 of the suction gripper 10, which is always introduced perpendicularly from above into the interior of the pot. In order that the suction gripper can also engage in obliquely lying closure covers without problems, the outer diameter of the suction gripper 10 is to be formed smaller than the inner diameter 1i of the closure cover 1. Due to the spherical tip 13 of the suction gripper 10 and the possibly inclined position of the closure cover 1, the closure cover can first be lifted obliquely by means of the suction gripper 10 and can accordingly be introduced obliquely into the bore. After being placed on the chamfer B f of the bore B, the closure cover 1 usually does not center itself completely relative to the suction gripper 10 when it is pressed further into the bore B, as a result of which the closure cover 1 is seated obliquely in the bore B when it is pressed further into the bore B. The sealing compound introduced into the bore B before the closure cover 1 is introduced is only insufficiently deposited on certain regions of the cover in the inclined position, as a result of which leaks can occur.A further closure cover is known from DE 27 44 501 A1, which has lateral edges for clawing in the wall comprising the bore to be closed.DE 10 2015 106 965 A1 discloses a pot-shaped closure cover for a bore, which closure cover has a lower region, an upper region and a transition region arranged between the two regions. The lower region has a smaller diameter and the upper region a larger diameter than a corresponding bore, so that the closure cap can first be loosely inserted into the bore with the lower region and then printed in. The closure cap is as a result arranged well centered in the bore.It is an object of the present invention to provide a closure cap in which a secure closing of the bore is guaranteed.This object is achieved according to the invention with a closure cover in which the side wall has a lower circumferential region and an upper circumferential region, wherein a transition region is arranged between the upper and the lower region, wherein the outer diameter of the upper end of the lower region adjoining the transition region is smaller than the outer diameter of the lower end of the upper region adjoining the transition region, wherein the outer diameter is larger than the inner diameter of the bore, and wherein the side wall has at least one circumferential depression, in particular in the form of a groove or groove, on its outer side in the upper region. The encircling depression serves for receiving sealing material, so that it can be distributed completely around the closure cover in a sufficiently large amount. The sealing material that has entered the encircling depression then acts in a manner that is more or less like a sealing ring that is inserted into the encircling depression and is placed against the inner wall of the bore around the entire circumference of the closure cover. The side wall of the closure cover is designed somewhat conically, so that the largest outer diameter of the closure cover not yet pressed into the bore is larger than the inner diameter of the bore. When the closing cover is pressed in, its side wall is pressed slightly inward and springs against the inner wall of the bore, so that the outer side of the side wall rests with a large surface area against the inner wall of the bore. The region of the outer side of the side wall in which the at least one encircling depression is arranged is thus also pressed with the sealing material against the inner wall of the bore. Because more sealing material can collect in the circumferential depression than is normally the case in the closure covers known from the prior art between their outer side of the side wall and the inner wall of the bore, a permanently sealing connection is produced between the closure cover and the inner wall of the bore.If two or more encircling depressions are provided on the outer side of the side wall, these should preferably be arranged parallel to one another. In this case, it should be ensured that there is sufficient distance between the adjacent depressions, so that the side wall still bears directly against the inner wall of the bore with a sufficiently large surface.The depression can have a concave, partially circular, semicircular, rectangular or triangular shape in cross section. It is likewise advantageous if the width of the depression is 5% to 25% of the height of the side wall, wherein the rounded transition region to the base of the closure cover is not included in the height of the side wall. Advantageously, the width of the depression can be 0.2 to 1 mm. In the number and width of the depressions, it must be ensured that a sufficiently large sealing surface is always present, so that the surface pressure of the closure cap pressed into the bore is large enough.The depth of the depression is advantageously 0.05 to 0.3 mm, particularly preferably 0.1 mm. The depth and width should be constant over the entire circumference of the closure cap.In order that the closure cover according to the invention is always pressed securely and straight into the bore, i.e. the bore axis and the axis of rotation of the closure cover are congruent or parallel to one another, it is advantageous if the side wall of the closure cover has a lower circumferential region, wherein a transition region is arranged between the upper and the lower region, and that the outer diameter of the upper end of the lower region adjoining the transition region is smaller than the outer diameter of the lower end of the upper region adjoining the transition region, wherein the outer diameter of the lower end of the upper region adjoining the transition region is larger than the inner diameter of the bore. This results in a support surface for the closure cap, with which the closure cap is placed on the edge of the bore and by means of which the closure cap is aligned such that its axis of rotation is parallel to the axis of the bore. A centering of the closure cover relative to the bore is advantageously obtained by the transition region. In this embodiment, the at least one encircling depression is arranged in the upper region. The outer diameter of the upper end of the lower region adjacent to the transition region is either less than or equal to the inner diameter of the bore. The transition region advantageously forms a, in particular collar-shaped, bearing surface with which the closure cap can be brought to bear on the bore edge. As a result, the closure cover can easily be introduced with its lower region into the bore and is aligned by the transition region. For the collar formation, the outer diameter of the transition region increases continuously and / or abruptly in sections starting from the upper end of the lower region in the direction of the upper region. Advantageously, the outer diameter can increase by 0.05 to 0.2 mm, preferably by 0.06 to 0.1 mm, particularly preferably by 0.07 to 0.09 mm in the transition region.It is furthermore advantageous if the axial length of the upper region is greater than the sum of the axial lengths of the lower region and the transition region by 1.5 to 3 times, preferably by 2 to 2.8 times.In all the above-described embodiments of the closure cover according to the invention, the closure cover can be produced by deep-drawing a flat sheet metal part.The closure cover according to the invention can be produced by means of the following advantageous method steps. The outer side of the transition region and / or of the lower region can be machined either by means of a material-removing method, in particular by means of grinding, turning or milling, in order to incorporate the outer diameter profile. However, it is likewise possible that, in order to form the transition region and / or the lower region, a ring-shaped depression, in particular in the form of a groove or groove, is stamped or milled into the initially flat round blank by means of a punch before the deep-drawing. During the subsequent deep drawing, the circumferential depression of the surface is completely or at least partially retained and then forms the transition region and / or the lower region.To form the circumferential depression, it is likewise possible, prior to the deep-drawing, to emboss at least one annular depression, in particular in the form of a groove or groove, by means of a punch into the initially flat round blank. If the finished closure cover is to have a plurality of circumferential depressions in its side wall for receiving sealing material, a plurality of concentric annular depressions are to be introduced, in particular stamped or milled, into the flat round blank, in particular simultaneously by means of a punch.It is of course possible that before deep drawing into the initially flat round blank, an annular depression can be introduced both for forming the transition region and for forming the at least one annular depression of the side wall, in particular simultaneously.Various possible embodiments of the closure cover according to the invention are explained in more detail below with reference to drawings.The following are shown: FIG. 1 : closure cover according to DIN 443; FIG. 1a: Insertion process of the closure cover according to FIG. 1 by means of a suction gripper; FIG. 2 a : closure cover according to the invention with a circumferential depression in the outer side of the side wall; FIGS. 2 band 2 c : closure covers according to the invention with two or three circumferential depressions in the outer side of their side wall, wherein the depressions are semicircular in cross section; FIGS. 3a to 3c : closure covers according to the invention with one to three circumferential depressions in the outer side of their side wall, the depressions being of approximately rectangular configuration in cross section; FIGS. 4a to 4c : closure covers according to the invention with one to three circumferential depressions in the outer side of their side wall, the depressions being formed in cross section as V-grooves; FIG. 5a: Round with a circular depression introduced into the surface, semicircular in cross section; FIG. 5 b : closure cover which has been produced by means of deep drawing from the round blank according to FIG. 5 a and corresponds to the closure cover according to FIG. 2 a; FIG. 6a: Round with a circular depression made in the surface and semicircular in cross section, for forming a circumferential depression or groove in the side wall of the fully deep-drawn closure cover and an additional circular coaxial depression for forming the transition region; FIG. 6 b : closure cover which has been produced from the round blank according to FIG. 6 a by means of deep drawing; FIG. 7a: Round with a circular depression introduced into the surface to form the transition region; FIG. 7 b : closure cover which has been produced from the round blank according to FIG. 7 a by means of deep drawing; FIG. 7 c : Enlarged detail of FIG. 7 b.FIG. 2 ashows a first possible embodiment of a closure cover 1 according to the invention with a circumferential depression 20 in the outer side A of the side wall 1 s. The closure cover 1 is a rotationally symmetrical part with the axis of rotation RA. The closure cover 1 has a bottom wall 1b, which is adjoined on the outside by a round transition region 3, which connects the bottom wall 1b to the side wall 1s. The side wall 1s or only its outer side A is inclined slightly outwards with its upper edge 4 by the angle φ, wherein the outer diameter of the upper edge 4 is larger than the inner diameter D B of the bore to be closed. When the closing cover 1 is introduced into the bore to be closed, the closing cover 1 is pressed into the bore, as a result of which the side wall 1 sis pressed inward. The height H 1s of the side wall 1 sis many times greater than the width H 20 of the circumferential depression 20. Due to the circumferential depression 20, the sealing material can be distributed around the entire circumference of the closure cover at least in the depression 20. However, since the side wall 1s springs inward, sealing material will also be distributed over the entire circumference between the outer side A and the inner wall of the bore on both sides of the depression 20. In cross section, the depression 20 is semicircular or concave. The depression 20 can either be embossed or milled out. The embossing can be effected e.g. simultaneously with the punching out of the round blank T to be subsequently deep-drawn, as is illustrated in FIG. 5 a. It is likewise possible for the flat round blank T to be deep-drawn to be first punched out and for the circular depression 200 to be subsequently milled in. Generally, however, embossing will be preferable because it is faster and less expensive.FIGS. 2 band 2 c show two further possible embodiments of the closure cover 1 according to the invention, wherein the closure cover 1 shown in FIG. 2 bhas two circumferential depressions 20 in the outer side of its side wall 1 sand the closure cover 1 shown in FIG. 2 chas three circumferential depressions 20. All depressions 20 are semicircular or concave in cross section and are arranged parallel to one another. By providing more than one depression 20 on the outer side A of the side wall 1 s, the ratio of depression surface area to the non-depressed outer side A increases. The distance AB between the depressions 20 running parallel around the circumference should not be selected to be too small so that there remains still sufficient pressing surface on which the sealing material can be deposited on the outside and can be sealingly clamped between the outer side A and the inner wall of the bore.FIGS. 3 ato 3 c show three further possible embodiments of the closure cover 1 according to the invention with one to three circumferential depressions 20 in the outer side A of its side wall 1 s, wherein the depressions 20 are of approximately rectangular configuration in cross section.FIGS. 4 ato 4 c show three further possible embodiments of the closure cover 1 according to the invention with one to three circumferential depressions 20 in the outer side A of its side wall 1 s, wherein the depressions 20 are formed in cross section as V-grooves.It is of course possible for more than one encircling depression 20 to be provided on the outer side A, it being possible for the depressions 20 to have mutually different cross-sectional shapes, such as, for example, a) semicircular and V grooves or b) V grooves and rectangular, etc.FIG. 5 ashows a cross-sectional representation through the round blank T, which after deep drawing forms the outer side A with the upper flat side and the inner side I of the closure lid 1 with the lower flat side. The upper flat side A has a circular depression 200 which forms the depression 20 after the deep drawing. By selecting the cross-sectional shape of the depression 200, the cross-sectional shape of the depression 20 in the outer side A of the side wall 1 sis also determined. The cross-sectional shape of the depression 200 shown in FIG. 5 ais semicircular, as a result of which the depression 20 will likewise be semicircular or at least concave after the deep drawing.FIG. 5 bshows the finished closure cover 1, which has been produced from the round blank T according to FIG. 5 aby means of deep drawing and corresponds to the closure cover according to FIG. 2 a.FIG. 6 ashows a round blank T with a circular, semicircular cross-section, depression 200 made in the surface A for forming a circumferential depression or groove 20 in the side wall 1 sof the fully deep-drawn closure cover and an additional circular coaxial depression 100 for forming the transition region 1 sl, as is shown in FIG. 6 b. The transition region 1 sü serves for the parallel alignment of the axis of rotation RA of the closing cap 1 and the bore axis during the insertion and pressing-in of the closing cap into a borehole. It corresponds to the transition region of the closure cover 1, as is illustrated and described in FIGS. 7a to 7e. FIG. 6 bshows the fully deep-drawn closure cover 1.It is of course also possible, however, for the transition region 1 sü to be worked into the surface of the deep-drawn closure cover by means of a milling or grinding process in a closure cover, as is illustrated in FIGS. 2 ato 4 c.FIG. 7 ashows a round blank T with only one circular depression 100 made in the surface A and semicircular in cross section for forming the transition region 1 su, as is shown in FIG. 7 b. The lid 1 according to this embodiment does not have an annular recess 20 on the outside of the side wall 1 s.FIG. 7 bshows a cross-sectional representation through the closure cover 1, which has a bottom wall 1 band a side wall 1 sformed onto it, which are connected to one another by the bent connecting regions 3. The bottom wall 1b forms with its outer side a support surface A.The side wall is divided into three regions lying one above the other, wherein the lower region 1suis connected above the connecting region 3. At the top of the upper edge OE of the lower region 1su, the transition region 1 suis adjacent, the upper edge of which is adjacent to the upper region 1 so.FIG. 7c shows an enlarged detail in the region of the transition region 1sü of the closure cover. The outer diameter D2 of the upper edge OE of the lower region 1su of the side wall 1s of the closure cap 1 is smaller than or equal to the inner diameter D B of the bore B. The outer diameter D1 of the lower edge UE of the upper region 1so of the side wall 1s of the closure cap 1 is larger than the inner diameter D B of the bore B, so that the transition region 1sü forms a bearing surface for bearing on the edge of the bore B. The height H u of the lower portion 1suplus the height Hüis smaller than the height H o of the upper portion 1so. The ratio of H o / ( H u+ H ü) can be 1 to 3, preferably 2.5. The heights H o and H u can also be referred to as axial lengths of the regions 1su, 1so, since the closure cover 1 is rotationally symmetrical. The height H ü of the transition region is significantly smaller than the height H u. in comparison with the heights H o and H u and is in particular smaller by a factor of 2 to 5.The thickness of the side wall 1 smay be formed differently in the individual regions 1 su, 1 su, 1 so.

Claims

Closure cover (1) for a bore (B) which has an inner diameter (D B) wherein the closure cover (1) is of pot-shaped design and has a base wall (1b) and a side wall (1s) integrally formed thereon, wherein the side wall (1s) has a lower encircling region (1su) and an upper encircling region (1so), wherein a transition region (1sü) is arranged between the upper and the lower region (1su, 1so), characterized in that, the outer diameter (D2) of the upper end (OE) of the lower region (1su) adjoining the transition region (1sü) is smaller than the outer diameter (D1) of the lower end (UE) of the upper region (1so) adjoining the transition region (1sü), wherein the outer diameter (D2) is larger than the inner diameter (D B) of the bore (B), and the side wall (1s) has at least one circumferential depression (20) on its outer side of its upper region (1so).Closure cover (1) according to Claim 1, characterized in that the encircling depression (20) has the shape of a groove or groove.Closure cover (1) according to Claim 1 or 2, characterized in that the side wall (1s) has on its outer side at least two encircling depressions (20) which are arranged parallel and at a distance (AB) from one another.Closure cover (1) according to one of the preceding claims, characterized in that the depression (20) has a concave, partially circular, semicircular, rectangular or triangular shape in cross section.Closure cover (1) according to one of the preceding claims, characterized in that the width (H 20) of the depression (20) is 5-25% of the height (H 1s) of the side wall (1s).Closure cover (1) according to one of the preceding claims, characterized in that the depression (20) is 0.2 to 1 mm wide.Closure cover (1) according to one of the preceding claims, characterized in that the depth (T20) of the depression (20) is 0.05 to 0.3 mm.Closure cover (1) according to one of the preceding claims, characterized in that the depression (20) is of constant depth around the entire circumference of the closure cover (1).Closure cover (1) according to one of the preceding claims, characterized in that the width (H 20) of the depression (20) is constant around the entire circumference of the closure cover (1).Closure cap (1) according to Claim 1, characterized in that the outer diameter (D1) is less than or equal to the inner diameter (D B) of the bore.Closure cap (1) according to one of the preceding claims, characterized in that the maximum outer diameter (D1max) of the lower region is smaller than the inner diameter (D B) of the bore (B).Closure cover (1) according to one of the preceding claims, characterized in that the transition region (1sü) forms a bearing surface (A1), with which the closure cover (1) can be brought to bear on the bore edge (Br).Closure cover (1) according to one of the preceding claims, characterized in that the outer diameter (Da) in the transition region (1sü) increases continuously and / or abruptly in sections in the direction of the upper region (1so) starting from the upper end (OE) of the lower region (1su).Closure cover (1) according to one of the preceding claims, characterized in that the outer diameter (D1) is greater than the outer diameter (D2) by 0.05 to 0.2 mm.Closure cover (1) according to one of the preceding claims, characterized in that a connecting region (V) connects the bottom wall (1b) to the lower region (1su) of the side wall (1s).Closure cover (1) according to one of the preceding claims, characterized in that the outer wall (1soa) of the upper region (1so) is formed conically (angle φ) and / or in that the outer wall (1sua) of the lower region (1su) is formed conically or cylindrically.Closure cap (1) according to one of the preceding claims, characterized in that the axial length (Lo) of the upper region (1so) is 1.5 to 3 times greater than the sum of the axial lengths (Lu, Lü) of the lower region (1su) and the transition region (1sü).Closure cover (1) according to one of the preceding claims, characterized in that the closure cover (1) is a deep-drawn part.Method for producing a closure cover (1) according to one of the preceding claims, characterized in that the closure cover (1) is produced from a sheet metal by means of deep-drawing.Method according to claim 19, characterised in that at least the outer side of the transition region (1 su) and / or of the lower region (1 su) is processed by means of a material-removing method for incorporating the outer diameter profile.Method according to claim 19, characterised in that, in order to form the transition region (1 su) and / or the lower region (1 su), a ring-shaped depression (100) is impressed or milled into the initially flat round blank (T) by means of a punch before the deep drawing.Method according to one of Claims 19 to 21, characterized in that, in order to form a depression (20), at least one annular depression (200) is stamped or milled by means of a punch into the initially flat round blank (T) before the deep-drawing.Method according to claim 22, characterised in that a plurality of depressions (200) are introduced, impressed or milled concentrically into the flat round blank (T).Method according to claim 23, characterised in that the plurality of depressions (200) are introduced simultaneously by means of a punch.Method according to one of the preceding claims, characterized in that, before the deep drawing, an annular depression (100) and an annular depression (200) are introduced, stamped or milled or ground into the initially flat round blank (T).

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