Patent Grant
12005546
This application is the national stage application under 35 U.S.C. § 371 of International Application No. PCT/EP2019/052112 filed on 29 Jan. 2019, which claims priority to DE 102018000670.1 filed 29 Jan. 2018, and DE 202018000435.9 filed 29 Jan. 2018 the entire disclosures of which are incorporated herein by reference in their entireties.
The invention relates to a sliding ring for a grinding device with a grinding element and a hood covering the grinding element, wherein the sliding ring is intended to be attached to the side of the hood facing a surface to be machined. The invention further relates to such a grinding device and a method for producing such a sliding ring.
Grinding devices have a grinding element with grinding material on at least one surface, wherein the grinding element is movably arranged in a head of the grinding device. The grinding element is often referred to as a wear plate, grinding plate or grinding shoe and can perform rotating or eccentric movements. So-called drywall grinders are used in particular in the construction industry, but also in the private sector, wherein the head is swivel-mounted on a bracket. In order to reduce the emission of dust, the head of many grinding devices is equipped with a hood or cover, which has a connection for a suction device, so that the grinding dust produced can be sucked out from inside the hood by means of the suction device during operation of the grinding device. The suction device can also be used to generate a vacuum, which causes the head to adhere to a surface to be ground. This is particularly advantageous when working on ceilings or large wall surfaces where the user of the grinder no longer has to bear the entire weight of the grinder due to the adhesion.
Such a grinder is known for example from DE 20 2005 011 659 U1. In order to achieve a good tightness of the hood with respect to the environment and at the same time an easy sliding of the grinding device over the surface to be machined, the grinding device described herein has a sliding ring which is attached to the edge of the hood facing the surface to be machined and then slid over the surface to be machined and largely or completely closes the gap between the hood and the surface to be machined. The hood, and thus also the sliding ring, and the grinding element can be adjusted relative to one another, so that the front edge of the sliding ring and the front of the grinding element can be brought into an aligned position. The sliding ring is made of a slidable, solid and rigid material so that it remains dimensionally stable when working with the grinder. As a result, however, the tightness of the hood can no longer be guaranteed in the event of unevenness in the surface to be ground, such that the negative pressure and the resulting holding force of the grinding device on the surface to be machined is reduced. This often leads to the grinder falling off the surface to be machined.
From DE 20 2015 000 409 U1, a grinding device of a similar design is known, but which has an elastic sealing profile that extends around the entire circumference of the hood. The sealing profile is preferably designed as a silicone lip. This ensures that the hood is sealed even on an uneven surface. However, the sealing or silicone rings described here have only insufficient sliding properties. In order to make it possible for the suction hood to slide on the surface to be machined or to avoid it being suctioned tightly, the vacuum in the suction hood must not be too high. However, this negative pressure is insufficient to bring about a holding force which, particularly when working overhead, not only partially, but completely holds the weight of the head of the grinding machine on the surface to be ground.
Conventional sealing and sliding rings for suction hoods do not have high sliding properties in connection with a sufficiently pronounced elasticity to ensure a constant airtight seal of the suction hood on uneven surfaces to be ground. However, this tight seal is necessary so that grinding devices with extraction hoods reliably hold their own weight on the surface to be machined even when working on uneven surfaces, in order to make the user's work significantly easier.
It is therefore an object of the present invention to provide a sliding ring and a grinding device with such a sliding ring, wherein the disadvantages of the prior art can be avoided or reduced. In addition, a method for producing such a sliding ring is to be provided.
This object is achieved by a sliding ring, a grinding device and a method for producing the sliding ring according to the independent claims. Advantageous further developments and preferred embodiments can be found in the dependent claims and the description below.
The sliding ring according to the invention for a grinding device with a grinding element and a hood covering the grinding element, also called a drive plate cover, drive plate housing or grinding head cover, can be attached to the side of the hood facing a surface to be machined. The sliding ring has a sliding surface provided for sliding on the surface to be machined. The sliding ring has at least one elastic component and a sliding component, the sliding surface being arranged on the sliding component and the elastic component being arranged on the side of the sliding component opposite the sliding surface. The sliding component guarantees the sliding of the sliding ring or the grinding device over the surface to be machined, despite the forces acting on the sliding ring and sealing the sliding ring due to the negative pressure. This is achieved through favorable friction values, i.e. the static and sliding friction coefficients, of the sliding component. The elastic component is elastically deformable and is used to adapt the seal ring to the existing unevenness of the surface to be machined. In the case of assembly, i.e. when the sliding ring is mounted on the hood, the sliding component is arranged at least on the side of the sliding ring facing the surface to be machined.
The advantage of the sliding ring according to the invention is its pronounced lubricity in connection with its property of reliably sealing the hood against the entry of undesired false air. A relatively constant negative pressure can thereby be ensured in the interior of the suction hood, which in turn brings about a stable holding force which then reliably holds the grinding device or its head against the surface to be ground.
The elastic component as well as the sliding component are preferably in combination (i.e. together) locally elastically deformable, so that the shape of the seal ring adapts itself locally and flexibly to the surface to be machined. This ensures that the hood is watertight even on a surface that is not completely level, so that a stable suction effect can be guaranteed that is large enough at all times to allow the weight of the grinder to be applied to the surface to be machined, e.g. on the ceiling of a room. Thanks to the improved sealing of the hood, lower reserves of the suction forces generated by the suction device during operation of the grinding machine are also required. As a result, the sliding ring is pressed less strongly against the surface to be ground, which results in significantly better sliding behavior, i.e. the user of the grinding device has to apply less force to move the grinding device back and forth on the surface to be machined. In addition, due to the stabilization of the suction effect, a lower degree of concentration on the part of the user of the grinding device and less control effort for controlling external air are necessary than in prior art.
The elastic component preferably has an elastically deformable material, such as rubber, an elastomer or foam, in particular and preferably a foam made of rubber-elastic material, preferably plastic, and in particular and preferably consists of an elastically deformable material, such as rubber, an elastomer or foam, in particular and preferably a foam made of rubber-elastic material, preferably plastic, or contains one or more resilient component(s), which may for example be made of plastic or metal.
In a preferred embodiment, the elastic component and/or the sliding component or an assembly formed from the elastic component and a sliding component directly adjacent to the elastic component has a compression hardness of less than 120 kPa, particularly preferably less than 100 kPa and particularly preferably less than 80 kPa. In a preferred embodiment, the elastic component and/or the sliding component or an assembly formed from the elastic component and a sliding component directly adjacent to the elastic component has an elastic component of less than 11,000 MPa, particularly preferably less than 10,000 MPa and particularly preferably less than 9,000 MPa.
In a particular embodiment, the sliding ring furthermore has a hard component. This can serve as an abutment for the elastic component if it is elastically deformed. When mounted, the hard component is arranged on the side of the sliding ring facing the hood, i.e. on the side of the elastic component facing away from the surface to be machined.
If the sliding ring has no hard component, part of the hood can serve as an abutment for the elastic component.
In one embodiment, the elastic component is enclosed by the sliding component or the sliding component and the hard component only on part of its outside, i.e. along its circumference in a cross section through the sliding ring. This means that the sliding component is arranged, for example, only when mounted on the surface of the elastic component opposite the surface to be machined, but not on the side of the elastic component. It is also possible to arrange the sliding component on the surface of the elastic component opposite the surface to be machined and on a partial region of the side surfaces of the elastic component, with the two partial regions respectively adjoining the surface of the elastic component opposite the surface to be machined.
Preferably, however, the elastic component is completely enclosed by the sliding component or the sliding component and the hard component. Since the sliding component or the sliding component and the hard component thus form a closed space inside or between them, the elastic component can, in addition to the above-mentioned embodiments, also be a gas, a liquid, a gel or a large number of solid particles or a combination of both. However, the elastic component particularly preferably has no gas.
The sliding component is preferably a region of the surface of the elastic component that is changed compared to the base material of the elastic component, or a coating of the elastic component with a lubricious material or a lubricious film, or is characterized by a plurality of small, and in each case non-deformable, elements made of a lubricious material. A modified surface area, a coating or an embodiment using a plurality of non-deformable elements is only possible with a fixed version of the elastic component using an elastically deformable material or a resilient component, while the implementation of the sliding component as a sliding film can be implemented at any time. The lubricious film within the meaning of the application comprises both films consisting entirely of a sliding material and films whose surface facing the surface to be machined (the sliding surface) is coated with a lubricious material.
Lubricious materials that can be used to form the sliding component or parts of the sliding component are, for example, polyethylene (PE), particularly preferably ultra-high molecular weight polyethylene (PE-UHMW) or polytetrafluoroethylene (PTFE), polyolefin, graphite, polypropylene (PP) or polyamide (PA).
A modified surface area of the elastic component can be, for example, the outer coating formed in the manufacturing process of a polyethylene foam used as the elastic component.
In a preferred embodiment, the sliding component is made of a different material than the elastic component.
The sliding surface of the sliding component particularly preferably has a dynamic friction coefficient of less than 0.5, particularly preferably less than 0.4, particularly preferably less than 0.35, particularly preferably less than or equal to 0.3. The sliding surface of the sliding component particularly preferably has a dynamic friction coefficient of more than 0.05, particularly preferably of more than 0.1, particularly preferably of more than or equal to 0.15. The dynamic coefficient of friction is particularly preferably determined according to the test standard ISO (IEC) 7148-2 or according to the test standard ASTM D 3702. The dynamic coefficient of friction is particularly preferably determined using pin-disc testing equipment with a test setup based on the requirements of ISO 7148-2. For this purpose, a pin with a diameter of 6 mm made of the material to be tested is pressed at 3 MPa onto a rotating C35 steel disc, with a diameter of 160 mm, and a roughness of Ra=0.7-0.9 μm. The disc runs at a speed of 0.33 m/s over a distance of 28,000 meters. The dynamic sliding friction coefficient is determined from the average values of three test specimens between 10 and 28 km running distance.
In a preferred embodiment, the sliding component has a thickness of less than 1 mm, particularly preferably less than 0.5 mm, particularly preferably less than 0.35 mm, particularly preferably less than 0.1 mm, particularly preferably less than 0.05 mm. The sliding component can be, for example, a PTFE coating on the elastic component with a layer thickness of 0.01 to 0.04 mm. The sliding component can, for example, also be made of PE and have a layer thickness of 0.1 to 0.3 mm.
In a particularly preferred embodiment, the sliding ring has a hard component, which is a ring made of a rigid plastic, while the elastic component is an annular layer made of a polyurethane foam and the sliding component is a polyethylene film, wherein the hard component and the sliding component completely or partially enclose the elastic component.
The sliding ring preferably has a component which can form part of a releasable connection of the sliding ring to a hood of a grinding device. This ensures the interchangeability of the sliding ring, which is required, for example, due to wear of the sliding component or the elastic component, or the replacement of the sliding ring according to the invention by other components, for example a brush ring, in applications in which the other component is more suitable. Such components are, for example, snap hooks, Velcro fasteners, detachable adhesive connections, magnetic, clamping, screw or plug connections or the corresponding counterparts to those components if they are arranged in the hood of the grinding device. For example, the sliding ring can have undercuts in the hard component for latching snap hooks, which are formed on the hood. In order to connect the sliding ring to the hood, the sliding ring component interacts with the corresponding components or elements of the hood of the grinding device.
In a further preferred embodiment, openings are arranged in the hard component for the passage of air into the interior of the sliding ring and thus, in the assembled state, into the interior of a hood of a grinding device. False air openings and/or control valves for regulating the supply of false air in the hood of the grinding device can thus be at least partially saved. The openings are preferably evenly distributed over the circumference of the sliding ring.
The sliding ring preferably forms a continuous ring. In another preferred embodiment, the sliding ring has at least two ring segments that are independent of one another or releasably connected to one another. For example, a ring segment can represent a quarter of the ring circumference of the sliding ring, while a second ring segment represents three quarters of the ring circumference. This embodiment enables, particularly in the case of a similarly divided hood of a grinding device, the grinding of the surface to be machined close to the edge, for example, in the edge regions or corners of a ceiling where the ceiling abuts a side wall, or in areas in which the ceiling or elements protruding from a wall, for example, stucco decorations, are arranged.
The sliding surface of the sliding ring according to the invention is particularly preferably ring-shaped. The sliding surface can be made circular. However, other ring-shaped geometries for the sliding surface are also conceivable, for example triangular or elliptical rings.
In a preferred embodiment, the sliding surface is flat or crowned.
In a preferred embodiment, the thickness of the sliding component of the sliding ring measured in the direction normal to the sliding surface is smaller than the thickness of the elastic component measured in the same direction. The thickness of the elastic component of the sliding ring measured in the direction normal to the sliding surface is particularly preferably more than a factor of 2, particularly preferably more than a factor 5, particularly preferably more than a factor 10, particularly preferably more than a factor 15, particularly preferably more than a factor of 20, particularly preferably more than a factor of 25, particularly preferably more than a factor of 30 thicker than the thickness of the sliding component measured in the same direction.
The sliding ring according to the invention is preferably used on a grinding device which has a grinding element and a hood covering the grinding element, the sliding ring being arranged on the side of the hood facing a surface to be machined. A grinding device is understood to mean any form of grinding or polishing device in which a cutting tool element is covered with a hood and which is guided over a surface to be machined, a negative pressure being generated in the hood, which brings about a stable holding force which the grinder or its head then reliably holds the surface to be machined.
A grinding device according to the invention has a grinding element, a hood covering the grinding element and a sliding ring according to the invention arranged on the side of the hood facing a surface to be machined. In addition, a connection for a suction device is formed in the hood, the suction device being suitable for extracting air and grinding dust from the interior of the hood during operation of the grinding device.
The hood preferably has a first region which contains a part of the circumference of the side facing a surface to be machined and can be detached from other regions of the hood, the sliding ring having at least two ring segments which are independent of one another or releasably connected to one another, as described above. A ring segment of the sliding ring is arranged on the first area of the hood, wherein the length of the first area of the hood and the length of the ring segment of the sliding ring arranged on the first area are the same. This makes it particularly easy to grind the surface to be machined close to the edge.
The method according to the invention for producing an embodiment of the sliding ring according to the invention, in which the sliding component is a film, has the steps described below. First, a slidable film is inserted into a mold, the mold having an interior, the edge of which is at least partially covered by the film after it has been inserted. In a special embodiment, a ring or a segment of a ring made of a rigid material is also inserted. Then, an elastic material or a starting material made of an elastic material is inserted into the interior of the mold and—in the special embodiment—in an intermediate space between the film and the ring or the segment of a ring or introduced between the film and the ring or the segment of a ring through one or more openings in the mold and/or the film and/or—in the special embodiment—in the ring or the segment of a ring. The elastic material can be, for example, a gas, a liquid, a gel or solid particles, particularly preferably a plurality of solid particles or a combination thereof. In this case, the film or—in the special embodiment—the film and the ring or the segment of a ring form a complete or partial covering of the elastic material. Furthermore, the elastic material can be rubber or foam, in which case a liquid or gaseous starting material of the rubber or foam is introduced, which is subsequently treated thermally or otherwise, so that the elastic material is formed inside the mold or in the space between the film and the ring or segment of a ring. If the elastic material is, for example, foam, the starting material is a foamable material which is foamed during or after its introduction, thereby producing a foam (foam-like material). In the case of a slightly leaking elastic material, the film and the rigid plastic carrier can be connected to the elastic component before filling, for example by welding or gluing. Here again one or more openings can be closed with a material in such a way that the elastic material is prevented from escaping from the sliding ring even under pressure. However, this step can also be omitted if the elastic material is a solid material which does not emerge through one or more of the openings even under pressure. Thus, there is a composite component made of the slidable film and the elastic material or—in the special embodiment—from the ring or the segment of a ring, the slidable film and the elastic material arranged between them. Finally, areas of the film that protrude beyond the sliding ring can be optionally removed.
If the sliding ring is manufactured as a whole using this method, the sliding ring can then be removed using a separating step, such as cutting, sawing or laser cutting, and can then still be divided into several ring segments. Of course, this is only possible for sliding rings in which the elastic component consists of a solid material. In the case of other materials, such as gases, liquids, gels or solid particles or combinations thereof, the ring segments are produced separately using the described method and then assembled to form the sliding ring.
A ring or a segment of a ring made of a rigid plastic is preferably used, while the film consists of polyethylene and the starting material of the elastic material contains polyurethane and a blowing agent.
The invention is further clarified below using exemplary embodiments and figures. The dimensions of the individual elements and their relationship to one another are not reproduced to scale, but only schematically. The same reference numbers designate corresponding components of the same type.
The sliding ring 1 consists of a hard component 10, an elastic component 11, which cannot be seen in the illustration in
The ring 101 is essentially uniform over its entire course, but has special features at some points, which will be discussed in more detail below.
In the example shown, six hood elements 102 are arranged along the circumferential line of the ring 101. Of course, the number of hood elements can also be larger, for example eight, or smaller. These extend the second section 101b upwards, i.e. towards the hood, and are used to cover openings formed in the inner wall of the hood to separate a section formed in the inner wall of the hood from adjacent sections of the inner wall of the hood towards the interspace by means of a hook. In this way, the hood elements 102 are always arranged at the points on the ring 101 where an undercut 103 is also formed in each case to accommodate the hook formed in the inner wall of the hood in the second area 101b of the ring. Thus the undercuts 103 form means for the detachable connection of the seal ring 1 to a hood of a grinder, corresponding to the means located on the hood of the grinder, the aforementioned hooks.
In addition, reinforcing ribs 104 are formed on the upper side of the first region 101a, which serve to increase the rigidity of the first region 101a when pressure forces are applied to the underside of the sliding ring 1. The reinforcing ribs 104 are formed in one piece with the ring 101 in the exemplary embodiment shown. Of course, the number of reinforcing ribs can also be larger or smaller.
In the ring 101, eight openings 105 to the outside air inlet are furthermore formed, which extend from an outer side of the second region 101b and the upper side of the first region 101a to an inner side of the ring 101 and, in the case shown, are cuboidal. Of course, the number of openings to the outside air inlet can also be larger or smaller. Through these openings 105, air flows into the interior of the hood during operation of the grinding device, so that the dust produced during grinding can be extracted by means of a suction device. In areas of the ring 101 in which the openings 105 for the external air intake are formed, the second bearing surface 101d for the outer wall of the hood is interrupted and therefore not present, as shown in
In the second region 101b, four notches 106 are also formed, which serve to receive connecting walls of the hood, which connect the inner wall and the outer wall of the hood and improve the rigidity of the hood, in the assembled state of the sliding ring 1. In the case of a divisible hood, in which a part of the hood, for example a grinding head tip, can be removed from the rest of the hood, the connecting walls serve as end walls, which separate the space between the inner wall of the hood and the outer wall of the hood against the environment when the seal ring 1 is mounted, thus providing dust protection. With a larger number of notches 106, the number of possibilities for mounting the sliding ring 1 in the hood increases, so that the assembly requires less concentration by the operator. For example, in the case of 16 notches 106, there are theoretically eight possible positions in which the sliding ring 1 can be mounted, the sliding ring being rotated by 45° between the individual positions.
Furthermore, two openings 107 and 108 are formed in the first region 101a of the ring 101. These serve to introduce an elastic material or a starting material for an elastic material, which forms the elastic component 11 of the sliding ring, in the method according to the invention for producing the sliding ring or the escape of excess elastic material or starting material during the production process. Of course, the number of these openings can also be larger or smaller.
In addition, twelve vent holes 109 are formed in the ring 101. Some of them are arranged in the openings 105 to the outside air inlet, others outside these openings 105. The vent holes 109 are used for the escape of gas from the elastic material when it is formed or when it is compressed and the entry of gas into the elastic material when it decompresses again after a compression process.
The elements mentioned, i.e. the hood elements 102, the undercuts 103, the reinforcing ribs 104, the openings 105 to the outside air inlet, the notches 106 and the ventilation holes 109, are arranged in the illustrated exemplary embodiment in a manner that is evenly distributed over the circumference of the sliding ring 1, but can in other exemplary embodiments also be unevenly distributed.
The elastic component 11, which can be seen in
In other exemplary embodiments, if the elastic component 11 consists of other materials, such as, for example, a gas, a liquid, a gel or loose solid particles, there are no openings in the hard component 10 from which the material of the elastic component could possibly escape under pressure, or are closed again after filling the material of the elastic component.
The sliding component 12 in the illustrated embodiment consists of a film 121 made of polyethylene. In the area of the reference line of reference numeral 121 in
Details of the hard component 10 are explained below with reference to
The first region 101a has a width b1, measured from the inner side facing a grinding element (grinding plate) of the grinding device to an outer side of the sliding ring, and a height h1. In addition,
The opening 105 to the outside air inlet runs obliquely from the top of the first region 101a to the inner side of the ring 101 and is cuboid. In this case, the opening 105 has a height h3, which is measured perpendicularly between an upper side of the opening 105 and a lower side of the opening 105 and thus not along they direction, and a depth, measured in a direction that runs perpendicular to the plane of the drawing. The vent hole 109 is formed in the illustrated case with a circular cross section and extends from the top of the first area 101a to the bottom of the first area 101a.
The hood element 102 shown in
The reinforcing rib 104 is essentially triangular and has a height h5 and a width b5 and a thickness, measured in a direction perpendicular to the plane of the drawing, wherein the reinforcing rib is thicker on its side facing the second region 101b than on its outside. Between the reinforcing rib 104 and the vertical part of the second section 101b, there is a second bearing surface 101d and a gap 110, which widens slightly towards the top.
Exemplary dimensions of the individual elements of the sliding ring 1 shown in
The grinding device 2 contains a hood 30 which surrounds and covers the grinding element 20. A connection 31 for a connection to a suction device (not shown) is provided on the hood 30, air and grinding dust being sucked out of the interior of the hood 30 via the suction device and at the same time a negative pressure is generated inside the hood 30, as a result of which the grinding device 2 adheres to the surface to be machined. The grinding device also has a motor 40, which drives the grinding element 20 via a gear 50. With a holding device 60, the grinding device 2 can be held manually and moved over the surface to be machined. At the connection 31 for the connection to a suction device, a hose 70 is attached, which can be connected to a suction device, through which air and grinding dust are removed from the hood 30 and into a suction device.
The first area 35 of the hood 30 has a fastening element 37, for example a hook, which is inserted into a corresponding element of the second area 36 of the hood 30, for example a snap-in recess with a snap-in bridge, and is firmly connected to it, but can be releasable. In addition, the first section 35 of the hood 30 has several positioning elements 38, such as protruding lugs, which correspond to corresponding elements of the second section 36 of the hood 30 and ensure the correct positioning of the first section 35 in relation to the second section 36 during assembly.
The sliding ring 1 and the hood 30 are otherwise of the same design as the first embodiment 1 of the sliding ring described with reference to
The edge region 39 can be formed in one piece with the other regions of the hood 30″, in particular with the lateral region 301, or can be firmly and permanently connected to them. However, it is also possible for the edge area 39 to be detachably connected to the other areas of the hood. For this purpose, the hood can, for example, be designed similarly to the hood 30, which is described with reference to
Since the edge region 39 serves as an abutment for the elastic component 11 of the sliding ring 1″ when it is elastically deformed, reinforcing ribs similar to the reinforcing ribs 104 described with reference to the first embodiment 1 and the second embodiment 1′ of the sliding ring can be arranged in the edge region 39. In addition, at least one opening 302 for the external air inlet can be formed in the hood 30″, as is shown in
The third embodiment 1″ of the sliding ring shown in
In other embodiments of the sliding ring according to the invention, the connecting component is not part of the sliding ring, but is only connected to the sliding ring on the one hand and the edge region 39 of the hood 30″ on the other hand when the sliding ring is mounted on the hood 30″.
Of course, the hood 30″ and the sliding ring 1″ can also be supplied in a split form similar to that shown in
The number, arrangement and configuration of the various elements of the sliding ring according to the invention and the hood of the grinding device according to the invention are not limited to the illustrated embodiments. Some or all of the elements shown can be combined with one another or provided individually, as long as they are not mutually exclusive.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2018 000 670.1 | Jan 2018 | DE | national |
| 20 2018 000 435.9 | Jan 2018 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2019/052112 | 1/29/2019 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/145559 | 8/1/2019 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 5653561 | May | Aug 1997 | A |
| 8622788 | Eto | Jan 2014 | B2 |
| 20120184192 | Kawamata et al. | Jul 2012 | A1 |
| 20130196573 | Fukushima | Aug 2013 | A1 |
| 20160213216 | Laessig | Jul 2016 | A1 |
| Number | Date | Country |
|---|---|---|
| 101985208 | Mar 2011 | CN |
| 877080 | Sep 1961 | DE |
| 4322284 | Jan 1995 | DE |
| 4322284 | Jan 1995 | DE |
| 202005011659 | Nov 2005 | DE |
| 202005011659 | Dec 2005 | DE |
| 102009044554 | Apr 2011 | DE |
| 202015000409 | Mar 2015 | DE |
| 1925399 | May 2008 | EP |
| 877080 | Sep 1961 | GB |
| 2006007403 | Jan 2006 | JP |
| 2008033377 | Mar 2008 | WO |
| WO-2008033377 | Mar 2008 | WO |
| 2010087072 | Aug 2010 | WO |
| Entry |
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| Translation of DE4322284.pdf (Year: 2023). |
| International Search Report under International Patent Application No. PCT/EP2019/052112, dated May 7, 2019. |
| Number | Date | Country | |
|---|---|---|---|
| 20210016418 A1 | Jan 2021 | US |
