DE102017010288B3 - Device, kit and method for covering a reduction in a component and component - Google Patents

Abstract

Device for covering a counterbore (20) in a component, comprising a sleeve (2) with an axial bore, wherein the sleeve (2) is formed in an upper end region for covering the counterbore (20) and in a lower end region a peripheral, has a downwardly tapered expanding surface, a screw (4) with a screw shaft (11) and a screw head (10), wherein the screw shaft (11) is inserted into a lower opening of the bore and an upper side of the screw head (10) one of the spreading surface opposite opposing surface forms, and a substantially annular expansion element which is arranged between the spreader surface and the counter surface and between these by screwing the screw (4) in the sleeve (2) is spreadable, wherein the bore is a through hole (8) and the screw shaft (11) has a tool engagement on the upper side.

Description

The present invention relates to a device, a kit and a method for covering a reduction in a component and a component with such a device.

In many technical areas, there is the problem that dirt, chips or other foreign matter penetrate into existing in a component reduction and can enforce them over time. This is particularly disadvantageous when a head of a screw or other element is arranged in the countersink, which is to remain accessible, or if the countersink itself is a tool engagement, such as a hexagon socket head screw, which should remain accessible. For example, machine parts are often fastened to each other with countersunk cylinder head bolts, with both the counterbore for the cylinder head bolt head and the cylinder head bolt tool engagement itself becoming clogged with debris or debris. If the screw is then to be loosened in order to be able to remove the component fastened therewith, then the corresponding countersinking or the tool engagement must first be cleaned. This is often done in practice by blowing compressed air into the sink, which involves an increased risk of contamination and injury due to the blown out dirt particles and chips. The handling of compressed air can be problematic for safety reasons. On the other hand, a complex manual cleaning of the reduction is required if no compressed air is available or should not be used for this purpose. Likewise, it may be desirable for optical reasons to avoid accumulation of dirt or other debris in a sinking of a component.

According to DE 10 2004 001 944 A1 are holes of a linear guide closed by caps, which are each pressed into a cylindrical extension of the hole.

Out EP 0 803 656 A1 an arrangement for closing holes in guide rails is known, wherein the holes are closable by sealing plugs which are inserted in the closed position each with its disc-shaped upper part and a concentric pin in an end portion of the bore. In this case, in the end portion of the bore an annular, at a circumferential location a continuous radial slot having clamping disc is arranged, in the bore of which a pin of the sealing plug is pressed.

According to DE 10 2014 113 034 A1 is a cup-shaped cover plate so dimensioned that it can be inserted centrally into the countersink bore of a cylinder head screw and this covers flush with the joining part. The insertion of the cap in the countersink hole is done with force in the direction of the screw axis, wherein the force over a spreader deforms the cap in such a way that its circumference permanently widened in the countersink hole. When removing the cover plate, the cap becomes unusable.

In EP 2 327 888 A1 is disclosed a cap having a convexly curved shape, which is convertible by snapping into a concavely curved shape and wherein a peripheral edge of the cap is designed so that in the concavely curved shape engagement or snagging with an inner edge of an opening is made possible. The cap is made of a magnetic material. To remove the cap, a magnet is attached to this to return the cap from the concave to the convex shape.

Out DE 10 2014 112 591 A1 For example, a connecting element is known that comprises a head with a cylindrical outer circumference and a tool engagement in the form of a hexagon socket inserted therein. Thus, the tool engagement is protected from contamination, a tool adapted to the circumferential geometry ram is inserted captive in the tool engagement, the top closes in a closed position with the top of the head and the tool engagement releases in an open position, the plunger against a spring force from the Locking position is displaced in the open position.

In US 2013/0108392 A1 For example, a fastener assembly for securing two structural components together is disclosed. The fastener assembly includes a first fastener having a disc-shaped head portion and a cylindrical shaft having a bore with an internal thread, and a second fastener formed by a screw that can be screwed into the bore. Out US 4,609,317 a fastening system for connecting two workpieces is known, having interconnected holes. In this case, a bolt is inserted into a shank of a sleeve which is inserted into a bore passing through the workpieces. According to DE 197 02 838 A1 For example, a fastener for fixing plates to a substructure has a nut-like part and a screw, the nut-like part having a stop collar and a tubular portion for engaging a threaded portion of the screw.

The known covering devices are not readily removable or be at Destruction requires a special removal tool, a considerable manufacturing effort, and / or requires a special modification of the component in which the countersinking is present.

It is an object of the present invention to provide a device, a kit and a method for covering a reduction in a component and a component with such a device, wherein the above-mentioned disadvantages are avoided as possible and wherein the device easily attachable, easily removable and reusable is as well as no modification of the component, which has to be covered lowering requires.

This object is achieved by a device according to claim 1 and by a kit according to claim 12, a method according to claim 13 and a component according to claim 14.

A device according to the invention is designed to cover a reduction in a component. The component may for example be a machine part, such as a machine part with a countersink for receiving the head of a cylinder head bolt, or a screw with a serving as a tool engagement depression, for example, a hexagon socket screw. In particular, the device is designed for insertion into an approximately cylindrical countersinking, for example a blind hole, and for covering the countersinking, wherein, for example, also a hexagonal recess is considered to be approximately cylindrical. It is understood that the device according to the invention can also be suitable for covering a through-bore in the component. The device is also referred to below as a cover.

The device according to the invention comprises a sleeve which is approximately rotationally symmetrical with respect to an axis. The sleeve has an axial, preferably central bore and may be formed, for example, in a hollow cylindrical section. The length of the sleeve measured in the axial direction may be smaller, equal to or greater than the outer diameter of the sleeve. In its upper end portion, the sleeve is designed to cover the reduction, for which, for example, the upper end face of the sleeve can form a transversely to the axis plan surface and / or the sleeve can be widened at its upper end in diameter, so that an opening of the reduction can be filled or covered to the surface of the component by the sleeve or the extension. By "top" is here referred to a first axial direction with respect to the sleeve and with "bottom" an opposite direction. With respect to the use of the counter covering device, the upward direction is the direction out of the component and the downward direction is the lowering of the component.

In its lower end region, the sleeve has a peripheral, downwardly tapering expansion surface. Preferably, the spreading surface forms a lower portion of the peripheral surface of the sleeve, in which the peripheral surface tapers obliquely down to the axis. In particular, the spreading surface radially surrounds a lower opening of the axial bore. The spreading surface may be approximately rotationally symmetrical to the axis of the sleeve, for example, conical.

Furthermore, the device according to the invention comprises a screw which has a screw shank and a screw head which attaches to the screw shank and is preferably formed integrally therewith. The screw shaft is inserted into the lower opening of the axial bore, in particular screwed into the bore from the lower end of the sleeve forth. For this purpose, the screw shaft may have an external thread, and the bore of the sleeve may be at least partially provided with an internal thread, wherein the external and the internal thread cooperate for screwing the screw. The side of the screw head which is directed towards the screw shaft and which, in this arrangement of the screw, is the top side of the screw head, forms a counter surface arranged opposite the spreading surface. The mating surface may be approximately plan or, for example, conically tapering upwards.

Furthermore, the device according to the invention comprises a substantially annular expansion element, which is arranged between the spreading surface and the counter surface. The expansion element may for example be formed as a closed ring, which is arranged and held approximately coaxially with the axis of the sleeve or of the screw shaft. In particular, it can be provided that the expansion element in an assembled state of the device, in which the screw shaft is partially screwed into the sleeve, rests against the spreading surface and on the counter surface. As a result, the expansion element can be held approximately coaxially between the expansion surface and the counter surface.

If the screw shaft is screwed into the bore of the sleeve, in particular screwed further into the hole from the mounting state, the expansion surface and the counter surface are moved toward each other, wherein the expansion element between the two counteracting surfaces is spread. The spreader is thus spread by screwing the screw into the sleeve, in particular it can by the Pushed counter surface over the slope of the spreader and thereby spread. In this case, an inner diameter of the substantially annular expansion element is increased approximately and thereby widened the expansion element and displaced radially outwards and thus increases the outer diameter of the expansion element. Alternatively or additionally, it may also be possible to reduce by the pressure between the spreading and counter surface an axial dimension of the expansion element and thereby to increase the outer diameter of the expansion element.

Characterized in that the expansion element is spread, the expansion element can create an inner wall of a countersink or a bore in a component, so that the device can be held in the depression or in the bore. The countersink or bore, on the inner wall of which the expansion element applies, may be the same countersink covered by the device, or another countersink or bore located within the former; In the following, such a reduction or bore arranged within the depression to be covered is referred to as a holding depression.

Characterized in that the spreading of the expansion element is controllable by screwing the screw into the sleeve, a simple use of the device for covering a reduction in a component can be made possible. By further screwing the screw into the sleeve, the force with which the expansion element bears against the inner wall of the counterbore or the counterbore can be increased and the device thereby held particularly firmly in the counterbore. Further, by unscrewing the screw from the bore a mutually away movement of the spreading and the mating surface can be achieved and thereby the spreading force are canceled again; this allows removal of the device from the sink, if the reduction is to be made accessible again, for example, to use a tool. Furthermore, a removal of the cover is possible without destroying them. Thus, in a simple and safe way, a protection against ingress of dirt or chips in the sink and also a simple disassembly and reuse of the cover allows.

Preferably, the device consists only of said three items, namely the sleeve, the screw and the expansion element.

The sleeve and the screw can be made of a metallic material, such as steel. In this case, a simple and cost-effective production of the sleeve and the screw, for example, with a lathes possible.

Preferably, the expansion element is elastic and consists for example of rubber or an elastically deformable plastic material. In a particularly preferred manner, the expansion element is designed as an O-ring, which may be available, for example, as a standard part. This makes it possible to ensure that the expansion element is no longer applied to the inner wall of the countersink or the counterbore, when the screw shaft has been unscrewed a bit out of the bore, for example, back to the assembled state; Thus, the removal of the device from the reduction can be facilitated. Furthermore, this can improve the reusability of the device for covering a reduction. In a particularly preferred manner, the spreader element has, at least on the outside, a surface which has a high static friction coefficient with the material of the component which has the countersink or the countersink. In this way, the holding force with which the cover can be kept in the reduction, can be further increased.

Advantageously, the sleeve has at its upper end a radially enlarged annular collar, preferably a disc which has a larger outer diameter than the sleeve and the upper side is planar. The disc is in particular designed to cover the reduction and has for this purpose a diameter which corresponds to the width of the opening of the reduction to be covered or is larger. Preferably, the disc is formed integrally with the sleeve. This allows a particularly safe and effective coverage of the reduction.

According to a preferred embodiment of the invention, the spreading surface and preferably also the counter surface are each approximately conically shaped, wherein half the cone angle of the spreading surface is smaller than half the cone angle of the counter surface. In particular, the spreading surface and the counter surface are each formed as a truncated cone of a straight circular cone. In this case, the spreading and the counter surface are arranged opposite each other with opposing bevel, ie, the apex of the expansion is directed downward and the counter surface upwards. Half of the cone angle is in each case the angle which the respective conical surface, viewed in a longitudinal section of the sleeve or the screw, forms with the axis of the sleeve or of the screw shank. The angle at which the spreading surface is inclined to the axis of the sleeve is thus smaller than the angle at which the counter surface is oblique to the axis of the screw shaft. The fact that the angle which the respective surface encloses with the axis is smaller in the spreading surface than in the counter surface, the spreading element is not only spread when screwing the screw into the sleeve, but at the same time relatively displaced towards the sleeve in the direction of the upper end of the sleeve. From the time at which the expansion element has contact with the inner wall of the counterbore or the counterbore and is held by friction in this, the sleeve is thus pulled down by further screwing the screw into the sleeve down and thus into the reduction. This allows a particularly simple and secure mounting of the cover in the reduction. In particular, when the sleeve has on the upper side a disc covering the reduction, the disc is used on the component and is therefore particularly tight and tight against the surface of the component. As a result, the penetration of dirt or chips can be avoided in the reduction particularly effective.

Preferably, the half cone angle of the spreading surface is about 45 ° and half the cone angle of the mating surface about 75 °. In this way, on the one hand, an effective spreading of the expansion element and on the other hand, a retraction of the sleeve in the reduction and a drawing of the disc to the surface of the component allows.

According to the invention, the bore of the sleeve is designed as an axial through-hole, which, in the event that the sleeve has a disk on the upper side, also passes through the disk; In this case, the disc is formed in particular annular. Furthermore, it is inventively provided that the screw shaft at its upper end, i. at the opposite end of the screw head, a tool engagement. This makes it possible to turn the screw from above the device. The device can thus be inserted into the countersink and then the screw with the tool can be rotated to hold the device for covering the countersink therein. Conversely, to loosen the device, the screw can be rotated in the reverse direction. As a result, the use of the device for covering the reduction is further facilitated.

Preferably, the tool engagement is a radial slot in the upper end face of the screw shaft. This makes it possible to turn the screw with a slot screwdriver. Since a radial slot is only slightly clogged with dirt or shavings and is also easier to clean than other tool interventions, the advantage can be achieved thereby that the tool engagement can always be made easily and safely accessible without, for example, using compressed air ,

Preferably, the internal thread of the bore and the cooperating external thread of the screw shaft are formed as a fine thread. As a result, a particularly sensitive spreading of the expansion element and the exercise of a high spreading force and thus a high holding force of the device in the reduction is possible. The inner and the outer thread can be formed as a right-hand thread or as a left-hand thread.

Preferably, the screwing depth of the screw is limited in the sleeve by a stop, which may be given for example by the fact that touch the spreading and the mating surface. In a particularly preferred manner, the stop is determined such that an upper side of the screw shaft, when the screw is screwed into the sleeve until it stops, is flush with the top of the sleeve or the upper-side disc of the sleeve or slightly opposite this. The top of the screw shaft may, as described above, have a tool engagement and be formed otherwise as an approximately planar end face of the screw shaft. This makes it possible that the cover has a substantially flat surface, and that the surface of the component is also largely flat with the cover inserted.

In a particularly preferred manner, the screwing depth of the screw is limited in the sleeve by a stop, wherein in the reachable end position, the outside of the expansion element is spread over an extension of the outer contour of the sleeve and / or the screw head. By tightening the screw in the sleeve as far as the stop, the device can thus be securely fixed in the depression to be covered or in a retaining recess arranged inside it. As a result, the use of the device according to the invention for covering a reduction is further facilitated. In a particularly preferred manner, the stop is determined such that both the top of the screw shaft is almost flush with the top of the sleeve or the disc, and at the same time the device is held firmly in the lowering or the counterbore to be covered.

Advantageously, the device comprises a ferromagnetic material, in particular the sleeve and / or the screw is made of one. In this way it is possible to remove the cover by attaching a magnet, such as a magnetic screwdriver, from the reduction after loosening the screw or turning back the screw in the assembled state. This further facilitates the use of the device.

In particular, the device for covering the hexagon socket of a hexagon socket screw is formed, preferably for a cylinder screw with hexagon socket DIN 4762 . DIN 912 . DIN 7987 or DIN 6912 , in a particularly advantageous manner for a hexagon socket screw with a wrench size from about 8 mm, and / or for covering a screw head countersink with a screw with cylinder head DIN 974-1 or DIN 974-2 , However, the device can also be designed to cover other tool engagements or screw head depressions with other types of screws, such as internal splines. In a particularly preferred manner, the material and the dimensions of the expansion element are selected such that the cover can be held in differently shaped reductions or holding reductions.

The invention also relates to a kit for covering a reduction in a component. According to the invention, the kit comprises a sleeve which is formed as described above, a screw which is formed as described above and can be screwed into the bore of the sleeve, and a substantially annular expansion element which can be pushed onto the screw shaft, so that it then when the screw shaft is screwed into the bore of the sleeve, can be held between the spreader and the counter surface. By screwing the screw with the expansion element in the sleeve can be made as described above device for covering a reduction in a component, and by further screwing the screw into the sleeve, the expansion element between the spreader and the counter surface can be spread, so that the Can be kept to cover the reduction in this or a retaining depression present therein.

Furthermore, the present invention relates to a method for covering a reduction in a component. According to the method of the invention, a sleeve, a screw and a spreading element, each of which is formed as described above, are provided. The sleeve, the screw and the expansion element are dimensioned for insertion into the countersink or in a present in the reduction lowering; in the case that the sleeve has a disc, the disc is formed with a diameter which is greater than or about equal to the diameter of the opening of the countersink to the surface of the component. Then, the spreader is placed on the screw shaft or on the spreading surface, for example, pushed from the upper end of the screw shaft on this or pushed from the lower end of the sleeve forth on the spreader or placed. The screw shaft is then screwed so far into the bore of the sleeve, that the screw is held on the sleeve and thus the spreader is held. In particular, the screw shaft is screwed so far into the bore that the expansion element at the same time bears against the spreading surface and the mating surface, but is not yet spread to any significant extent. The assembly prepared in this way is then inserted into the depression to be covered in such a way that the upper side of the sleeve or the disk of the sleeve lies in the opening of the countersink or protrudes outwardly beyond it. In particular, the disc can rest on the outer surface of the component surrounding the countersinking. The screw is now screwed further into the sleeve, in particular by turning with a screwdriver, which is inserted into the tool engagement of the screw shaft.

The expansion element is thereby spread outwards, abuts against the inner wall of the reduction or a lowering and is finally pressed with force against them. At the same time, depending on the configuration of the spreading surface and the opposing counter surface, the sleeve pulled into the reduction or the disc can be brought with force to bear against the surface of the component. As a result, a safe and effective coverage of the reduction can be made possible. By turning the screw in the reverse direction, the attachment of the cover in the countersink or the counterbore can be solved again and removed from the reduction. The device can in particular be used several times.

Furthermore, the invention relates to a component with a counterbore and a cover inserted into it, the cover being adapted to the counterbore and designed as described above. In particular, the outer diameter of the sleeve and the screw head is slightly less than the diameter of the counterbore or a counterbore present therein, and the outer diameter of a disc forming the upper end portion of the sleeve is greater than or approximately equal to the diameter of the opening of the counterbore to the surface of the component. The component may be, for example, a machine part which has a countersink for receiving the head of a cylinder head screw, or else a screw with a countersink serving as a tool engagement, for example a hexagon socket screw.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

• 1a bis 1c ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung in einem Montagezustand in einer Schnittansicht, einem Teilschnitt und einer Seitenansicht;
• 2 die Vorrichtung gemäß 1a bis 1c in einem Haltezustand;
• 3a und 3b die Einzelteile der Vorrichtung gemäß 1a bis 1c in einem Teilschnitt bzw. in einer Seitenansicht;
• 4 symbolisch drei verschiedene Verwendungsmöglichkeiten der Vorrichtung gemäß 1a bis 1c zum Abdecken einer Senkung.

Further aspects of the invention will become apparent from the following description of a preferred embodiment and the accompanying drawings. Show it:

• 1a to 1c an embodiment of a device according to the invention in an assembled state in a sectional view, a partial section and a side view;
• 2 the device according to 1a to 1c in a holding state;
• 3a and 3b the items of the device according to 1a to 1c in a partial section or in a side view;
• 4 symbolically three different uses of the device according to 1a to 1c to cover a subsidence.

As in 1a is shown in a sectional view, the device for covering a reduction, hereinafter referred to as cover 1 is referred to, according to the embodiment shown, a sleeve 2 , the top side a disc 3 has, with which it is integrally formed. The cover 1 also includes a screw 4 and an O-ring 5 which consists of an elastic material. The sleeve 2 is in an upper section 6 cylindrically formed, which merges down into an inclined surface which serves as a spreading surface. The inclined surface is conical and is hereinafter referred to as the first conical surface 7 designated. The sleeve 2 has an axial through hole 8th on that in an upper area with an internal thread 9 is provided; in a lower portion has the through hole 8th no thread on.

The screw 4 consists of a screw head 10 and a screw shaft 11 , where the screw head 10 on its upper side also has a conical inclined surface, here as a second conical surface 12 referred to as. The screw shaft 11 has an external thread 13 on, with the internal thread 9 the sleeve 2 interacts. The top 14 of the screw shaft 11 is planar and has a radial slot 15 on. The top 16 the disc 3 is also flat, as well as the underside of the disc 3 , Both at the upper opening of the through hole 8th as well as at the top 14 of the screw shaft 11 is each a circumferential chamfer 17 . 18 arranged (s. 1b) , At the bottom of the sleeve 2 goes the first conical surface 7 via a narrow radial annular surface, a chamfer or a radius in the lower opening of the through hole 8th over; This defines a clear stop and damage to the conical surfaces 7 . 12 when tightening the screw 4 be avoided against the attack.

The O-ring 5 , which serves as a spreading element, is on the screw shaft 11 deferred and lies between the first conical surface 7 and the second cone surface 12 , In the in the 1a to 1c shown mounting state is the screw 4 so far in the sleeve 2 screwed in, that the O-ring 5 straight at the first conical surface 7 and at the second cone surface 12 is present, but not yet spread to a significant extent. The outside of the O-ring 5 is therefore still within a cylindrical surface, through the cylindrical upper portion 6 the sleeve 2 and the outer contour of the screw head 10 is defined. The 1b and 1c show the cover 1 in the assembled state in a partially sectioned view or in a side view. In 1b is shown that the O-ring 5 the screw shaft 11 surrounds annularly.

The sleeve 2 is approximately rotationally symmetric with respect to an axis 19 formed, which is also the axis of symmetry of the first conical surface 7 is, with the first conical surface 7 with the axis 19 includes an angle α (s. 1a) , If the screw 4 inserted into the sleeve, the axis falls 19 with the axis of the screw shaft 11 together and is also the symmetry axis of the second conical surface 12 , wherein the second conical surface 12 with the axis 19 an angle β includes. The second conical surface 12 stands the first conical surface 7 directed opposite to the axis 19 , In the illustrated embodiment, the angle is α about 45 ° and the angle β about 75 °.

In 2 is the cover 1 shown in a holding state in which the cover is held in a countersink. Here is the screw 4 up to a stop in the sleeve 2 screwed. The stop is determined by the fact that the first conical surface 7 and the second conical surface 12 in a respective inner edge area touch (s. 1a) , As in 2 shown is the O-ring 5 through the converging conical surfaces 7 . 12 while spreading it so far that it passes over the cylindrical surface passing through the cylindrical upper section 6 the sleeve 2 and the outer contour of the screw head 10 is formed, protruding outward. At the same time is the O-ring 5 shifted in the holding state relative to the mounting state upwards, ie closer to the upper end of the sleeve 2 or closer to the disc 3 arranged.

The sleeve 2 and the screw head 10 are sized so that their respective outer diameter is slightly less than the inner diameter of an approximately cylindrical bore into which the sleeve 2 and the screw 4 be used. In the in 2 shown holding state is the O-ring 5 over the through the outer contours of the sleeve 2 and the screw head 10 formed cylindrical surface out spreads and therefore rests against the inner wall of a corresponding reduction. The conical surfaces 7 . 12 and the O-ring 5 are designed so that the O-ring 5 then, if the screw 4 until it stops in the sleeve 2 screwed in, with force pressed against the inner wall of the countersink, leaving the cover 1 firmly held in the sink. In addition, when tightening the screw 4 due to the displacement of the O-ring 5 up the sleeve 2 pulled into the sink and the disc 3 to an upper side of the component having the reduction to be covered, pressed. As in 2 is shown, when reaching the stop of the screwing closes the top 14 of the screw shaft 11 flush with the top 16 the disc 3 from.

In 3a and 3b are the items that make up the cover 1 exists, namely the sleeve 2 with the disc 3 , the screw 4 and the O-ring 5 , shown individually. In the 3a and 3b shown position exemplifies an arrangement in which the items during assembly of the cover 1 be brought before the screw 4 with her screw shaft 11 into the through hole 8th the sleeve 2 is screwed into it. In the in 1a to 1c shown assembly state is also the O-ring 5 on the screw shaft 11 held. In the assembled state, the cover 1 inserted into a sink and removed from this, while in the in 2 shown holding state the cover 1 is kept in subsidence.

In 4 exemplify three possible uses of coverage 1 shown for covering a reduction in a component, namely on the left an overlap of the reduction, in the middle of a flush to the surface of the component cover the reduction and right cover a tool engagement of a screw. Here is the cover 1 each shown in the holding state in which it is held firmly in the respective reduction.

In the left part of the 4 the cover to be covered is a section-wise cylindrical countersink 20 in a component that symbolically as a block 21 is shown. The reduction 20 is in its upper, cylindrical section 22 for receiving the head 23 a cylinder head screw 24 educated. With the cylinder head screw 24 is the block 21 on a base body 27 screwed. The cylinder head bolt 24 has one as Allen reduction 25 configured tool engagement on. In the hexagon socket 25 is the cover 1 according to 1a to 1c used. The diameter of the cylindrical upper section 6 and the axial length of the sleeve 2 , as well as the dimensions of the screw head 10 , are designed so that the cover 1 in the 1a to 1c illustrated mounting state in which the O-ring 5 is not spread significantly, in the hexagon socket 25 can be used until the disc 3 on the surface 26 of the block 21 rests. The diameter of the disc 3 is greater than the diameter of the upper cylindrical section 22 the lowering 20 ,

After the cover 1 in the assembled state in the lowering 20 has been used, how to 2 explains the screw 4 by means of a from above into the slot 15 of the screw shaft 11 tightened screwdriver and thereby the O-ring 5 spread and to the inner wall of the hexagon socket 25 pressed. Here is the cover 1 due to the different inclination of the conical surfaces 7 . 12 in the sink 20 pulled in and the disc 3 firmly against the surface 26 pulled and finally the cover 1 stuck in the sink 20 held. The hexagon socket lowering 25 thus serves as a lowering for holding the cover 1 in the sink 20 , When reaching the stop is also the top 14 of the screw shaft 11 flush with the top 16 the disc 3 , This can reduce the penetration of dirt or chips into the sink 20 as well as in the hexagon socket lowering 25 safely prevented.

To remove the cover 1 just have the screwdriver in the slot 15 be used; in the slot 15 Dirt or shavings do not settle or only to a small extent and can easily be removed if necessary. The screw 4 is then rotated in the opposite direction, so that the conical surfaces 7 . 12 to move away from each other (s. 1a to 2 ) and the elastic O-ring 5 retreats to a smaller external dimension. If the O-ring 5 no longer the inner wall of the hexagon socket 25 touched or at least no longer with force, the cover can 1 be easily removed, possibly with a magnetic tool. The cover 1 can be used multiple times.

In the middle part of the 4 is the reduction to be covered also a partially cylindrical countersink 20 in the block 21 into which a cylinder head bolt 24 is used, the lowering 20 and the cylinder head bolt 24 are formed as described above. Also the cover 1 is formed as described above, wherein in the middle representation of 4 however, the diameter of the disc 3 the inner diameter of the upper, cylindrical portion 22 the lowering 20 is equal to or slightly smaller. Next is the thickness of the disc 3 so measured that the top 16 the disc 3 flush with the surface 26 of the block 21 lies when the disc 3 with her bottom on the top of the head 23 the cylinder head screw 24 rests.

As previously described, the cover 1 in the assembled state in the hexagon socket counterbore 25 the cylinder head screw 24 used. In this case, the disc lies 3 on top of the head 23 the cylinder head screw 24 on. As also previously described, the screw 4 now turned from the top with a screwdriver until the O-ring 5 to the inner wall of the hexagon socket 25 is pressed. This will cause the disc 3 against the head 23 the cylinder head screw 24 pulled and the cover 1 stuck in the sink 20 held. Here, too, is the hexagon counterbore 25 the lowering for holding the cover 1 in the sink 20 , Upon reaching the stop form the top 16 the disc 3 and the top 14 of the screw shaft 11 a continuous plane surface with the surface 26 of the block 21 , To remove the cover 1 will the screw 4 as described above in the opposite direction until the cover 1 can be easily removed.

In the right part of the 4 the depression to be covered is the hexagon countersink 25 a cylinder head screw 24 formed as described above and in the illustrated example against the surface 26 of the block 21 screwed. The component that has the reduction to be covered, in this case, the cylinder head bolt 24 itself. Also the cover 1 is formed as described above, wherein in the right-hand illustration of 4 however, the diameter of the disc 3 the outer diameter of the head 23 the cylinder head screw 24 equal or slightly smaller.

For covering the hexagon counterbore 25 the cylinder head screw 24 as described above, the cover 1 in the assembled state in the hexagon socket counterbore 25 used, with the disc 3 on top of the head 23 the cylinder head screw 24 rests. As described above, the screw is 4 Turned from above with a screwdriver until the O-ring 5 to the inner wall of the hexagon socket 25 is pressed, causing the disc 3 against the top of the head 23 the cylinder head screw 24 pulled and the cover 1 firmly in the hexagon socket 25 is held. When reaching the stop is the top 14 of the screw shaft 11 flush with the top 16 the disc 3 , To remove the cover 1 will the screw 4 as in the uses described above by way of example, turned in the opposite direction, so that the cover 1 Finally, it can be easily removed.

For clarity, not all figures are shown in all figures. Reference numerals not explained to a figure have the same meaning as in the other figures.

LIST OF REFERENCE NUMBERS

1

cover

2

shell

3

disc

4

screw

5

O-ring

6

Upper section

7

First conical surface

8th

Through Hole

9

inner thread

10

screw head

11

screw shaft

12

Second conical surface

13

external thread

14

top

15

slot

16

top

17

chamfer

18

chamfer

19

axis

20

reduction

21

block

22

Cylindrical section

23

head

24

Cylinderhead screw

25

Allen reduction

26

surface

27

body

Claims (14)

Device for covering a counterbore (20) in a component, comprising a sleeve (2) with an axial bore, wherein the sleeve (2) is formed in an upper end region for covering the counterbore (20) and in a lower end region a peripheral, has a downwardly tapered expanding surface, a screw (4) with a screw shaft (11) and a screw head (10), wherein the screw shaft (11) is inserted into a lower opening of the bore and an upper side of the screw head (10) one of the spreading surface opposite opposing surface forms, and a substantially annular expansion element, which is arranged between the spreader surface and the counter surface and between them by screwing the screw (4) in the sleeve (2) is spreadable, wherein the bore is a through hole (8) and the screw shaft (11) has a tool engagement on the upper side. Device after Claim 1 , characterized in that the spreading element is elastic, in particular as an elastically deformable O-ring (5). Device after Claim 1 or 2 , characterized in that the sleeve (2) on the upper side a disc (3). Device according to one of the preceding claims, characterized in that the spreading surface and the counter surface are each approximately conically shaped and half the cone angle (a) of the spreading surface is smaller than half the cone angle (β) of the counter surface. Device after Claim 4 , characterized in that half the cone angle (a) of the spreading surface is about 45 ° and half the cone angle (β) of the mating surface about 75 °. Device according to one of the preceding claims, characterized in that the tool engagement is formed as a radial slot (15). Device according to one of the preceding claims, characterized in that an internal thread (9) of the bore and for screwing the screw (4) cooperating with this external thread (13) of the screw shaft (11) are formed as a fine thread. Device according to one of the preceding claims, characterized in that a screwing depth of the screw (4) is limited by a stop, so that an upper side (14) of the screw shaft (11) is arranged almost flush with the top of the sleeve (2). Device according to one of the preceding claims, characterized in that the expansion element over an outer contour of the sleeve (2) and / or the screw head (10) is spread out. Device according to one of the preceding claims, characterized in that the device comprises a magnetic material. Device according to one of the preceding claims, characterized in that the device is designed to cover the hexagon socket of a hexagon socket screw. Kit for covering a counterbore (20) in a component, comprising a sleeve (2) with an axial bore, wherein the sleeve (2) is formed in an upper end region for covering the counterbore (20) and in a lower end region a circumferential, has a downwardly tapering expansion surface, a screw (4) with a screw shaft (11) and a screw head (10), wherein the screw shaft (11) is screwed into a lower opening of the bore, so that an upper side of the screw head (10) a the spreading surface of the sleeve opposite mating surface can form, and a substantially annular expansion element, which can be arranged between the spreader and the mating surface, wherein the bore is a through hole (8) and the screw shaft (11) has a tool engagement on top. Method for covering a counterbore (20) in a component, wherein a kit according to Claim 12 is provided, the spreader is placed on the screw shaft (11) or on the spreader surface, the screw shaft (11) is screwed so far into the bore of the sleeve (2) that the screw (4) is held in the sleeve (2) in that the assembly resulting therefrom is inserted into the depression (20) to be covered or into a retaining depression provided in the latter, that the upper end region of the sleeve (2) covers the countersink (20), and the screw shank (11) continues into the sleeve ( 2) is screwed in until the expansion element rests against an inner wall of the counterbore (20) or the counterbore. Component with a counterbore (20) and a device for covering the counterbore (20) in this device according to one of Claims 1 to 11 ,

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