CLAMPING AND / OR BRAKE DEVICE FOR HUMID ENVIRONMENTS

Description

TECHNICAL FIELD

[0001] The invention relates to an annular elastic element and a component for a pneumatic clamping and / or braking device and a pneumatic clamping and / or braking device, each with such an annular elastic element. BACKGROUND OF THE INVENTION

[0002] In the manufacture of tools or machine parts, processing machines, in particular work spindles or other machine tools, are used which process material from a workpiece using tools attached to a shaft, in particular to give it the desired shape. The shaft can be a rotational axis or pivoting axis of such a machine. Furthermore, rotating or pivoting tables are used with a shaft to place tools or workpieces in the appropriate processing position or to move workpieces at appropriate speeds. A high speed of the shaft is one of the prerequisites for precise and efficient processing. Emergency or safety systems therefore have the task of stopping the shaft or holding it in a fixed position and thus fixing it in the event of a malfunction or failure of the system, such as a power failure or cable break.

[0003] Common machining centers are equipped with electromagnetic, hydraulic, or pneumatic clamping and / or braking devices. These devices feature a friction lining that can be frictionally connected to the shaft via force transmission. This allows the shaft to be clamped at varying speeds.

[0004] In hydraulic clamping devices, a chamber is pressurized with hydraulic oil, clamping the rotating shaft or disc. Passive hydraulic clamps are also known. However, such hydraulic clamps have long response times, or short response times require considerable effort. Furthermore, the hydraulic material, especially hydraulic valves and hydraulic pipes, is expensive and requires longer assembly times. The hydraulic oil also requires additional effort to maintain cleanliness in the area surrounding a hydraulic clamp.

[0005] In pneumatic clamping and / or braking devices, elastic elements, in particular spring plates, are usually pressurized with compressed air and can overcome some of the disadvantages of hydraulic clamping devices mentioned above.

[0006] EP 1 629 939 A1 discloses: A braking device for frequently braking a moving part, in particular a shaft of a rotary table of a machine tool, comprises a prestressed annular spring plate element. A sealing plate is arranged on the front and rear sides. In cooperation with seals and the surrounding housing, two chambers are defined on either side of the spring element. By increasing the pressure in the chamber on the concave side of the spring element, the spring element can be subjected to a deformation force equal to or greater than its tension, so that its effect on the brake plate is compensated and the brake is thus released. In contrast, the pressure in the other chamber supports the action of the spring and thus the action of the brake.

[0007] CN 203412996 U discloses a pneumatic clamp and relates to a clamp for braking a motor. The pneumatic clamp consists of two shells and two bellows, the two shells being of equal size and symmetrical to each other; the bellows being of equal size, symmetrical to each other, are closed to be arranged in the two shells, and are fastened by screws; an inner cavity is formed between the two bellows; an outer cavity is formed between the shells and the bellows; an outer side surface of each shell is processed into a reference surface.

[0008] EP 1585 616 B1 and EP 1 651 881 B1 describe pneumatic clamping devices with two annular spring plates that are inserted into a housing of the clamping device and form a pressure chamber therein that can be pressurized with compressed air or vented to change the bending of the spring plates and thereby switch between a closed state of the clamping devices, in which an object to be clamped, such as a rotating shaft, is clamped, and an open state of the clamping devices, in which the object is free. However, practice has shown that such clamps fail in humid environments or cannot operate smoothly. BRIEF DESCRIPTION OF THE INVENTION

[0009] Based on the prior art mentioned at the outset, the object of the invention is to provide means that enable a pneumatic clamping and / or braking device to be operated reliably in humid environments.

[0010] The invention solves this problem with an annular elastic element having the features of patent claim 1, with a component having the features of patent claim 13 and with a clamping and / or braking device having the features of patent claim 15. Preferred embodiments are described in the dependent claims, in the description and in the figures.

[0011] According to the solution according to the invention, an annular elastic element for a clamping and / or braking device is provided, the element comprising: an annular spring plate, wherein the annular spring plate has a first annular side surface and a second annular side surface; a first sealing element, wherein the first sealing element is arranged on the first side surface of the spring plate; a second sealing element, wherein the second sealing element is arranged on the second side surface of the spring plate, and wherein the second sealing element forms an inner projection in a region of an inner edge of the annular spring plate and forms an outer projection in a region of an outer edge of the annular spring plate, wherein the first sealing element forms a first projection.

[0012] According to the solution according to the invention, a component for a clamping and / or braking device is further provided, the component comprising: the annular elastic element according to the invention; and a housing part, wherein the housing part has an annular recess for clamping the annular elastic element, and wherein the housing part has an inner surface defined by the recess; wherein, when the elastic element is clamped in the recess with the first side surface facing the inner surface, the first projection of the first sealing element is designed to make contact with a first portion of the inner surface of the housing part.

[0013] According to the solution according to the invention, a clamping and / or braking device for clamping and / or braking an object to be clamped and / or braked is further provided, the device comprising: a first elastic element according to the invention and a second elastic element according to the invention; a housing comprising a first housing part with an inner surface and a second housing part with an inner surface, wherein the housing parts are arranged and fastened to one another in such a way that the inner surfaces of the housing parts together delimit an interior space within the housing; one or more clamping elements, wherein each clamping element has a clamping surface;a spring arranged in the interior space comprising the first elastic element and the second elastic element, wherein the elastic elements are arranged within the interior space in such a way that a first pressure chamber is formed in the interior space between the elastic elements and the inner surfaces of the housing parts, wherein the first pressure chamber can be vented and can be subjected to overpressure from a pressure medium that can be supplied to the housing, wherein the first elastic element is clamped in the interior space with its first side surface facing the inner surface of the first housing part, and wherein the second elastic element is clamped in the interior space with its first side surface facing the inner surface of the second housing part;wherein the spring is designed such that, when the first pressure chamber is vented or vented or the first pressure chamber is subjected to overpressure, a bending of at least one of the spring plates of the elastic elements can be changed, and the device thereby changes between an open state, in which an object to be clamped is spaced from the one or more clamping surfaces, and a closed state, in which at least one of the one or more clamping surfaces transmits a clamping and / or braking force to the object; and wherein the first projection of the first sealing element of at least one of the elastic elements is designed to make contact with a first portion of the inner surface of one of the housing parts, in order to at least inhibit a flow connection between a region of the first pressure chamber and a transition between the housing parts.

[0014] The long-standing problem of the failure-prone operation of clamping and / or braking devices in humid environments has been overcome by this invention. The invention is based on the following findings of the inventors.

[0015] When the device is operated under the influence of liquid media, particularly in the area of ​​the clamping surface, there is a possibility of the liquid medium penetrating the housing of the device. As a consequence of this possibility, the medium penetrates into the first pressure chamber during operation, which leads to a backflow in the first pressure chamber. The penetration of the liquid medium leads to component failure due to leaks (e.g. rubber coating damage), contamination in the device and deterioration of the device's response times. The inventors have recognized that the penetration of the liquid medium is primarily due to small gaps that exist at the transition between the housing parts, in particular between the two clamping elements or clamping surfaces of the housing parts, of the device. During the opening process, for example, a second pressure chamber is expanded by, for example, pressurizing the second pressure chamber with compressed air.At the same time, the first pressure chamber vents. The movement of the elastic element (e.g., rubberized spring plate) displaces the air from the first pressure chamber, creating a suction effect through the first pressure chamber. As a result of the liquid medium penetrating the first pressure chamber, a small, permanent leak usually develops, including to the second pressure chamber, resulting in a constant flow of the liquid medium as long as the second pressure chamber is expanded. This effect further intensifies the suction effect and leads to accelerated failure or premature malfunction of the device.

[0016] Against this background, the inventors recognized that attaching a sealing element with a projection on the side of the elastic element facing the first pressure chamber interrupts this suction effect or inhibits it to such an extent that the above-described failures or malfunctions of the device can no longer occur. In particular, these means can inhibit the fluidic connection between the first pressure chamber and the transition between the housing parts or clamping elements without impairing the opening and closing function of the device or its dynamics.In the elastic element according to the invention, a second sealing element is arranged on the second side surface of the annular spring plate, and the second sealing element has an inner projection in a region of an inner edge of the annular spring plate of the elastic element and an outer projection in the region of an outer edge of the annular spring plate. These two projections on the inner and outer edges of the spring plate typically serve to rest on an opposite second elastic element or an inner wall of a housing to form the second pressure chamber there. Each of these two projections can therefore preferably have a bearing surface.According to the above findings of the inventors, the elastic element according to the invention has on the other (first) side surface of the spring plate, which can therefore face the first pressure chamber, a first sealing element which forms a first projection which is consequently suitable for projecting into the first pressure chamber and there at least for inhibiting the fluidic connection of the first pressure chamber with the transition of the housing parts.

[0017] The first projection is preferably formed between the inner and outer edges of the annular spring plate, with the first projection particularly preferably being formed in a region of the inner or outer edge of the annular spring plate in order to be close to the above-described gaps between the clamping elements, depending on whether the clamping action is directed inward or outward. The first projection is preferably mounted on the first side surface of the annular spring plate in such a way that it is suitable for being mounted in the region of the transition between the housing parts or the clamping elements and for projecting into the first pressure chamber.

[0018] According to a preferred aspect of the elastic element, the first sealing element further comprises - preferably on the first side surface, preferably in a region of the edge of the annular spring plate which is opposite the edge on which the first projection is arranged - a second projection which serves as a further interruption or inhibition of the fluidic connection of the first pressure chamber with the transitions of the housing parts or clamping elements.

[0019] According to a preferred aspect of the elastic element, the first and / or the second sealing element are vulcanized on the spring plate and are thus particularly well fixed there.

[0020] Preferably, the first and / or the second projection each have a surface that is rounded at least in sections in order to establish a contact in an arbitrarily shaped inner wall of the housing, which can cause the inhibition or interruption of the fluidic connection described above.

[0021] According to a preferred aspect of the component or device, the housing part has an indentation or depression in the inner surface of the housing part, wherein the indentation or depression is preferably complementary in shape to the surface of the first or second projection contacting it, so that the contact described above is particularly effective (sealing).

[0022] The inventors have recognized that both the first projection and the second, optional projection of the first sealing element are also suitable for inhibiting or even preventing the escape of pressure medium (especially gases) that may be present in the first pressure chamber. This enables the clamp to be used in a vacuum or clean room in addition to humid environments.

[0023] In order to reduce or prevent the escape of the pressure medium (especially gases) into the environment even more effectively, the inventors have developed a series of further optional means for use of the clamp in a vacuum or clean room, which can be used individually or in combination with the means described above for use in a humid environment in order to ensure even more reliable use of the clamp in a vacuum or clean room and thus to create a universally applicable clamp.

[0024] For example, the inner projection and / or outer projection of the second sealing element preferably each has a surface that is at least partially flat and can serve as a particularly sealing support surface, for example against a housing wall or another elastic element. This reinforces the sealing of the clamp or its second pressure chamber in order to inhibit or prevent the pressure medium from escaping from the second pressure chamber into the environment. The flat surfaces increase the resistance to the permeability of a pressure medium (especially gases) when the second pressure chamber is pressurized with the pressure medium. The flat surfaces reduce or prevent the overflow of a medium between the first pressure chamber and the second pressure chamber.

[0025] Alternatively or in addition to the flat surfaces, the inner and / or outer projection of the second sealing element can each form, at least in sections, a preferably radially extending bulge (or protrusion or outwardly directed curvature) in order to achieve particularly good sealing for use in a vacuum environment or in a clean room. The bulge can be created by applying additional (elastic) material of the sealing element compared to the rest of the projection. These bulges can fill an interior space within a housing part, for example in the region of a transition between the housing parts, and can be brought into sealing contact with an inner wall (e.g. a slope or long bevel) of the housing part. The bulge is preferably adjacent or contiguous to the flat surface. The flat surface preferably merges into the bulge.Preferably, the bulge of the outer projection of the second sealing element extends radially outward, preferably radially outward beyond the outer edge of the spring plate. Preferably, the bulge of the inner projection of the second sealing element extends radially inward, preferably radially inward beyond the inner edge of the spring plate.

[0026] The bulges are particularly advantageous for sealing the first pressure chamber against a gap at the junction of adjacent housing parts. The bulges ensure that little or no medium flows in or out over the edge of the housing during operation of the first pressure chamber.

[0027] The flat surfaces also support the displacement of the bulges against the inner wall of the housing parts, thus supporting the effects of the bulges described above. This support is particularly pronounced when, as described, the flat surface is adjacent to or contiguous with the corresponding bulge and / or merges into it. The flat surfaces and the associated bulges thus form a combination of features that interact synergistically, but can also exist individually.

[0028] With regard to use in a vacuum or clean room, the elastic material used for the elastic element can be a suitable material that preferably has little or no release of material into the vacuum (high media resistance), is suitable for high temperatures and / or has low gas permeability.

[0029] For use in humid environments or in a vacuum or clean room, a suitable material, preferably steel, can be used for the housing parts, which is preferably not susceptible to corrosion in order to avoid the release of rust into the vacuum or clean room.

[0030] To further contribute to particularly good sealing for use in a vacuum environment or in a clean room, the elastic element according to the invention can have a first connection seal for a first connection for supplying the first pressure chamber with a pressure medium, wherein the first connection seal seals the first connection. Preferably, an edge of the first connection seal can at least partially and preferably completely surround a first connection opening and can be in the form of an O-ring.

[0031] In order to further contribute to particularly good sealing for use in a vacuum environment or in a clean room, the elastic element according to the invention can have a second connection seal for a second connection for pressurizing the second pressure chamber with a pressure medium, wherein the second connection seal seals the second connection. Preferably, an edge of the second connection seal can at least partially and preferably completely surround a second connection opening and can be in the form of an O-ring. Particularly preferably, the edge can form a connection projection of the second connection seal, which at least partially forms a rear grip on the edge of the second connection opening. The housing part can be engaged behind by the rear grip of the connection projection of the elastic element.The recessed design of the second connection seal reinforces the seal to the outside and reduces the risk of the second connection seal lifting from the housing's flat surface, especially when applying pressure to the first pressure chamber. Furthermore, the recessed design eliminates the need for sealant (adhesive) at this location. Such a sealant could have a negative impact on the vacuum or clean room.

[0032] To further contribute to particularly good sealing for use in a vacuum environment or in a clean room, the housing part of a component or device according to the invention can have a preferably circular groove or notch for receiving an O-ring. The groove or notch with O-ring supports the previously described function of the bulge and the first connection seal in that no fluids flow in or out over the housing edge during operation of the first pressure chamber. In addition, the sealing compound (adhesive) between the housing halves, which is undesirable for use in a vacuum and in a clean room, can be eliminated.

[0033] Using the means described here, individually and in combination, terminals can be provided that can be operated reliably in humid environments and can also optionally be operated in a vacuum or in a clean room without negatively affecting the dynamics of opening and closing the terminal.

[0034] If this brief description of the invention describes features that are not listed in the patent claims, these features do not represent essential features in the sense that these features must necessarily be included in the patent claims to describe the invention, but these features are particularly prominent preferred implementations of the claimed invention, can be combined with any of the patent claims and can also be combined with each other as desired. BRIEF DESCRIPTION OF THE CHARACTERS

[0035] Figure 1Ashows a schematic cross-section through an inwardly directed, passive pneumatic clamping and / or braking device according to the invention in the closed state. Figure 1B shows a schematic cross section through an outwardly directed, passive pneumatic clamping and / or braking device according to the invention in the closed state. Figure 2A shows a schematic cross section through an inwardly directed, passive pneumatic clamping and / or braking device according to the invention in the open state. Figure 2B shows a schematic cross section through an outwardly directed, passive pneumatic clamping and / or braking device according to the invention in the open state. Figure 3A shows a schematic cross section through an inwardly directed, active pneumatic clamping and / or braking device according to the invention in the open state. Figure 3Bshows a schematic cross section through an outwardly directed, active pneumatic clamping and / or braking device according to the invention in the open state. Figure 4A shows a schematic cross-section through an inwardly directed, active pneumatic clamping and / or braking device according to the invention in the closed state. Figure 4B shows a schematic cross section through an outwardly directed, active pneumatic clamping and / or braking device according to the invention in the closed state. Figure 5A shows a cross-section through a pneumatic clamping and / or braking device according to the invention in three-dimensional representation. Figures 5B to 5D show a variant of one from Figure 5A removed housing part. Figures 6A to 6C show an embodiment of the elastic element according to the invention. Figure 7 shows a section through a variant of a housing part of a component or device according to the invention. Figure 8shows a cross-section through a device according to the invention, taken perpendicular to the clamping plane. Figure 9 shows a plan view of an elastic element according to the invention. Figure 10 shows a plan view of a variant of a housing part of a component or device according to the invention. Figure 11 shows a section in the area of ​​the second connection seal of a cross-section taken perpendicular to the clamping plane of an embodiment of a device according to the invention corresponding to the position of the Figures 9 and 10 indicated sections XI through the elastic element and the housing part. Figure 12 shows a section in the area of ​​the first connection seal of a cross-section taken perpendicular to the clamping plane of an embodiment of a device according to the invention corresponding to the position of the Figures 9 and 10 indicated sections XII through the elastic element and the housing part.

[0036] Components shown in several figures have the same reference symbols. DETAILED DESCRIPTION

[0037] The invention relates to an annular elastic element and a component for a pneumatic clamping and / or braking device and a pneumatic clamping and / or braking device, each with such an annular elastic element.

[0038] Whenever this document refers to the device "clamp" or "clamping device", the "clamping force" or the process of "clamping", then the device "brake" or "braking device" or the "braking force" or the process of "braking" are equally included.

[0039] The Figures 1Ato +5A and 8 show schematic cross sections through such a clamping device 10 according to the invention with a housing 3 which comprises two housing parts 3a, 3b, and with a spring 1 arranged in the housing 3, which spring comprises at least two annular elastic elements 1a, 1b according to the invention.

[0040] The clamping device 10 according to the invention comprises the following: a first elastic element 1a according to the invention and a second elastic element 1b according to the invention; a housing 3 comprising a first housing part 3a with an inner surface and a second housing part 3b with an inner surface, wherein the housing parts 3a, 3b are arranged and fastened to one another in such a way that the inner surfaces of the housing parts 3a, 3b together delimit an interior space 13 within the housing 3; one or more clamping elements 8, wherein each clamping element 8 has a clamping surface 7;a spring 1 arranged in the interior space 13, comprising the first elastic element 1a and the second elastic element 1a, wherein the elastic elements 1a, 1b are arranged within the interior space 13 in such a way that a first pressure chamber 4 is formed in the interior space 13 between the elastic elements 1a, 1b and the inner surfaces of the housing parts 3a, 3b, wherein the first pressure chamber 4 can be vented and can be subjected to overpressure from a pressure medium that can be supplied to the housing 3, wherein the first elastic element 1a is clamped in the interior space 13 with its first side surface facing the inner surface of the first housing part 3a, and wherein the second elastic element 1b is clamped in the interior space 13 with its first side surface facing the inner surface of the second housing part 3b;wherein the spring 1 is designed such that when the first pressure chamber 4 is vented or vented or the first pressure chamber 4 is subjected to excess pressure, a bending of at least one of the spring plates of the elastic elements 1a, 1b is variable and as a result the device 10 changes between an open state in which an object 5 to be clamped is spaced from the one or more clamping surfaces 7, and a closed state in which at least one of the one or more clamping surfaces 7 transmits a clamping and / or braking force to the object 5. The device 10 according to the invention further comprises the means mentioned at the outset which allow reliable operation of the device in a humid environment. These means are described in connection with the; Figures 6 to 12 explained in more detail.

[0041] The Figures 1A, 1B , 4A and 4BEach of these clamping devices 10 shows a closed state, with the clamping surface 7 of the clamping element 8 touching the periphery of the object 5. The clamping element 8 is also referred to as a clamping lip. The clamping element 8 can be formed integrally with the remaining parts of the housing part 3a, 3b or can be a component of the housing part 3a, 3b that is structurally separate from the remaining parts.

[0042] The clamping force or effect of the clamping surface 7 on the object 5 to be clamped takes place in a clamping plane which is spanned by two vectors, each of which forms a radius of the annular elastic elements 1a, 1b or annular recess 11 (cf. Fig. 5A). The axis 9 can pass through the center of the ring of the components described here as annular and can therefore be referred to as the main axis of the clamping device 10, which can run perpendicular to the clamping plane. When reference is made in this document to "inner" and "outer" projection, edge, or end, the inner edge, projection, or end is closer to the axis 9 than the corresponding outer edge, projection, or end. The same can also apply to other components.

[0043] The clamping device 10 can be designed rotationally symmetrical about this main axis 9. The main axis 9 can run approximately or exactly centrally through an opening of the clamping device 10 (opening 14 in Fig. 5B ). In the Figures 1A , 4Athe object 5 to be clamped, for example a rotatable shaft of a machine or a table, is placed within the opening 14 and the clamping force of the clamping device is therefore directed radially inwards towards the main axis 9 (perpendicular to the main axis 9) within the clamping plane. Figures 1B , 4B the object 5 to be clamped is placed outside the clamping device 10 and the clamping force of the clamping device is therefore directed radially outwards away from the main axis 9 (perpendicular to the main axis 9) within the clamping plane.

[0044] In Fig. 1A , 2A , 3A , 4A The clamping element 8 is located between spring 1 and opening 14 or main axis 9. In Fig. 1B , 2B , 3B , 4B however, the object 5 to be clamped at least partially surrounds the clamping device 10, so that the clamping element 8 is located between the object 5 and the opening 14 or main axis 9. In Fig. 1B ,2B , 3B , 4B Instead of the object 5 to be clamped, a component which at least partially fills the opening 14 and through which the main axis 9 extends can be introduced into the opening 14.

[0045] In Figures 1A to 5A The spring 1 is between two contact surfaces (101 and 102 in Fig. 5C and 5D ) is clamped within the housing 3 of the clamping devices 10 and extends between the two contact surfaces. In the pressure-free initial state of the device 10 in the Figures 1A to 2Bthe spring 1 can be slightly bent in order to be firmly fixed in the housing 3 in this state and the same can apply to any other state of the device 10, whereby the degree of bending of the spring 1 depends on the state of the device 10. If the device 10 is in a state in which the spring 1 is bent (e.g. more bent than in the pressure-free initial state, such as in the open state), venting an inner pressure chamber 2 of the spring 1 and ventilating an outer pressure chamber 4 can lead to at least partial relaxation of the spring 1 while the spring 1 presses against the radial contact surfaces, the distance between which increases slightly, so that the housing 3 is elastically deformed in the region of the clamping element 8 or the clamping surface 7 and the clamping surface 7 therefore touches the object 5 and is pressed against the object 5 with a (predefined) clamping force in order to clamp the object 5.The object 5 is clamped and the clamping device 10 is in the closed state, as in . Figures 1A and 1B shown. In the closed state of the device 10, the spring 1 can still be slightly bent even after partial relaxation in order to be firmly fixed in the housing 3 in this state.

[0046] The clamping element 8 can be an elastic element, such as a spring fork, which, in the pressure-free initial state of the device 10, is brought from an initial position in which the elastic element is relaxed into a tensioned position by the spring force of the (slightly) bent spring 1, for example by bending the spring fork 8, until an equilibrium is established in the pressure-free initial state between a restoring force of the elastic element 8 and the spring force of the spring 1. In this equilibrium, the clamping surface 7 can press against the object 5.

[0047] By additionally applying compressed air (e.g. 4 bar or 6 bar) to the outer pressure chamber 4 in the closed state, there is the option of increasing the clamping force by a predetermined value. This is described in the Figures 1A, 1B indicated by the optional additional compressed air pump (booster) 6 and the hatching (compressed air) in the outer pressure chamber 4. The outer pressure chamber 4 can be connected via an opening in the housing 3 to an air connection I (also referred to as "close") to which the compressed air pump 6 can be connected.

[0048] This makes it possible, for example, to control the device 10 in such a way that a change occurs between a braked movement of the acted-upon object 5 (in the pressureless state) and a complete clamping of the object (with sufficient pressure application).

[0049] Even if two pressure chambers 2, 4 are shown and described here as examples, the clamping device 10 can also be operated with a single pressure chamber, which can be, for example, the inner pressure chamber 2 or the outer pressure chamber 4.

[0050] Figures 2A and 2B show the clamping devices 10 from the Figures 1A and 1B in each case in the open state in which the clamping surface 7 does not touch the circumference of the object 5 or is spaced from the circumference of the object 5. The inner pressure chamber 2 can be connected via an opening in the housing 3 to an air connection 11 (also referred to as "Open"), to which a compressed air pump 6 can be connected.

[0051] By applying compressed air (for example 4 bar or 6 bar) to the inner pressure chamber 2 by the compressed air pump 6 and venting the outer pressure chamber 4, the spring 1 is, compared to the closed state of Fig. 1A, 1B, more strongly (convexly) bent or tensioned, resulting in a radial shortening of the spring 1 or the distance between the two contact surfaces. The clamping surface 7 lifts off the object 5 to release the clamping. The object 5 is freely movable (e.g., rotatable about axis 9 or linearly movable along axis 9) and the clamping device 10 is opened.

[0052] The device 10 can be switched back and forth between the closed state and the open state.

[0053] Such pneumatic clamps 10 have a number of advantages over hydraulic clamps.

[0054] By using the combination of elastic components, here a spring 1 with elastic elements 1a, 1b, and compressed air, for example, very short reaction times are achieved when switching between the open and closed state and also a secure clamping of the object 5 is ensured. The spring 1 can preferably be designed in the shape of a plate, as in Fig. 5 shown in more detail, wherein two superimposed elastic elements 1a, 1b form the spring 1 and the inner pressure chamber 2 of the spring 1 between the plates 1a, 1b. The plates 1a, 1b can also be annular, as in Fig. 5shown, and can optionally additionally have radial slots so that a change in the inner diameter is possible with particularly low forces. The elastic elements 1a, 1b can be coated with rubber, at least in the area of ​​the slots, in order to create the tightness required for the compressed air. The elastic elements 1a, 1b are generally designed to be pressure-resistant and elastically bendable and are arranged in the housing 3 of the clamping device 10 in such a way that the inner pressure chamber 2 is formed between the elastic elements 1a, 1b within the spring 1 and the outer pressure chamber 4 is formed between each elastic element 1a, 1b and the housing 3 or the housing parts 3a, 3b of the clamping device 10. Figure 5 shows a three-dimensional view of a clamping device 10 similar to Figures 1A and 2A .

[0055] By venting or applying compressed air to the outer pressure chamber 4 and venting the inner pressure chamber 2, as in Fig. 1A As shown, the spring 1 is at least partially relaxed and exerts a clamping force on the object 5 to be clamped, in particular on the circumference of a shaft 5. In the event of a power or pressure failure, the object 5 is clamped or the shaft 5 is immediately brought to a standstill, thus providing a safety clamp. Depending on their size, such pneumatic clamps 10 can achieve holding torques of several 100 Nm and up to several 1000 Nm, which can be increased by additionally pressurizing the outer pressure chamber 4 with compressed air, as in Fig. 1Aby a pressure pump 6 (booster). Here, compressed air of a few bar (for example, 4 bar or 6 bar) is sufficient to provide several times the holding torque achieved without a booster. This takes advantage of the fact that slight transverse bending of the plates 1a, 1b (perpendicular to their longitudinal axis) when switching between the open and closed state of the clamp 10 generates large spring forces, which can be used to clamp or release preloaded clamping devices 10. This enables secure clamping and release even of rapidly rotating machine shafts 5.

[0056] Pneumatic clamps also require lower costs and assembly effort than hydraulic clamps, and the use of compressed air eliminates any additional effort required to maintain cleanliness within the system. Such pneumatic clamps also allow for compact dimensions, as minimal transverse deflection and minimal (changes in) longitudinal expansion of the spring, and thus small pressure chamber volumes, are sufficient to generate the required clamping forces.

[0057] In pneumatic clamps, a distinction is made between passive clamping devices 10, as in Fig. 1A to 2B shown, and active clamping devices 10, as in Fig. 3A to 4B shown.

[0058] In the initial, pressure-free state, spring 1 can be bent to varying degrees (transversely) and thus radially shortened to varying degrees. The interior of housing 3 can be adapted to the bending of elastic elements 1a, 1b or define it. A corresponding stop surface for elastic elements 1a, 1b can be formed, for example, by an inner housing wall. The inner housing wall can be designed to complement (e.g., concave) a bending (e.g., convex) of elastic elements 1a, 1b.

[0059] In passive clamping devices 10, the spring 1 is generally slightly elastically bent (e.g. convex) or pre-tensioned in the pressure-free initial state and the clamping devices 10 can be closed ( Fig. 1A, 1B ). The clamping device 10 is only opened by the application of force from the inside by applying compressed air to the inner pressure chamber 2 ( Fig. 2A, 2B). In the initial pressure-free state, the spring 1 is usually slightly bent, so that in the event of a clamping action or in the event of a pressure drop, the spring force generated by the energy stored in the spring 1 is transferred to the object 5 to be clamped as a clamping force in order to clamp the object 5.

[0060] With active clamping devices 10, in the pressureless initial state ( Fig. 3A, 3B ) the spring 1 is curved more strongly, in particular more convexly, transversely outwards than in passive clamping devices, so that the distance between the two radial contact surfaces is shortened and the clamping device 10 is opened. No clamping force is exerted on the object 5 via the clamping surface 7. The object is free because the clamping surface 7 does not touch the object 5 or is spaced from the object 5.

[0061] Due to plastic deformation of the elastic elements 1a, 1b, the spring 1, with the same housing 3, can be more transversely curved outwards in the depressurized initial state and thus more radially shortened than with passive clamping devices. This smaller radial expansion of the elastic elements 1a, 1b in the depressurized initial state can lead to an open state of the clamping device 10 in the depressurized initial state. Even with plastic deformation, the elastic elements 1a, 1b are elastically bent and press against the contact surfaces so that the spring is fixed in the housing. The interior of the housing or the recesses can absorb the greater curvature caused by plastic deformation in the initial state.

[0062] The clamping force must now be actively induced from the outside, as in Fig. 4A and 4Bshown to transfer the clamp into the closed state. Here, compressed air is introduced into the external pressure chamber 4 by a compressed air pump 6, thus pressurizing the spring 1 from the outside in such a way that the spring 1 is actively relaxed, the curvature of the spring 1 is reduced, the distance between the two contact surfaces increases, and the housing 3 is elastically deformed in the area of ​​the clamping element 8 or the clamping surface 7, so that the clamping surface 7 touches the object 5 and exerts a clamping force on the object 5, thereby clamping the object 5. The active clamping device 10 is then in the closed state.

[0063] Depending on the area of ​​application and the prescribed safety regulations, an active or passive clamping system 10 is used. If a safety clamp is primarily desired, a passive clamping device is generally used. With such pneumatic passive clamping systems, it is possible to generate a predetermined clamping force even in a depressurized state when the device is appropriately mounted in an overall device, which clamping force is applied to the object 5 to be clamped. By applying overpressure or negative pressure, the forces transmitted to this object can be increased, reduced, or completely eliminated, which opens up a wide variety of applications. If, on the other hand, the clamping device is primarily intended to carry out a deliberate work process, such as a tool change, an active clamping device is generally used.

[0064] As in Figure 5AAs shown, the housing 3 of the clamping devices 10 according to the invention comprises two housing parts 3a, 3b, which are fastened to one another by fastening means, such as screws, and are mounted such that, in the mounted state, the two housing parts 3a, 3b define the interior space 13 between the housing parts 3a, 3b within the housing 3, in which the spring 1, together with its inventive annular elastic elements 1a, 1b, are arranged. The housing parts 3a, 3b each define a recess 11, which is also annular and which serves to receive the annular elastic elements 1a, 1b, as in Figures 5A to 5D shown. At least a part of the first contact surface 101 of the housing part can run (substantially) perpendicular to the radial direction R of the annular recess 11 and / or a part of the second contact surface 102 of the housing part can run (substantially perpendicular) to the radial direction R of the annular recess 11.

[0065] Through the center of the housing 3 extends an opening 14 (Fig. 5B) into which the object 5 to be clamped, such as a shaft, can be inserted. The housing can extend up to 360° around this opening and at least partially encloses the object 5 in at least one plane, which is referred to as the clamping plane. The central main axis 9 of the clamping devices runs centrally through the opening 14 and perpendicular to the clamping plane. In clamping devices according to Fig. 1A , 2A , 3A , 4A , 5A the main axis 9 runs centrally through the shaft along its longitudinal axis.

[0066] Along the circumference of the housing 3 or the opening 14 is one or more of the clamping surfaces 7 which, in the event of elastic deformation of the housing 3 in the region of the clamping element 8 or the clamping surface 7, exert the clamping force on the outer circumference of the object 5 and can thereby clamp the object 5. For effective opening and closing of the clamping device 10 with respect to the object 5 to be clamped, without risk of damage to the object 5, a symmetrical distribution of the clamping force along the clamping surface 7 or along the circumference of the object 5 is desirable. A non-symmetrical distribution of the clamping force can lead to damage to the object 5. Preferably, one or both contact surfaces 101, 102 are circular within the clamping plane. Preferably, the clamping surface 7 is circular within the clamping plane. The clamping element 8 can be annular.All ring-shaped or circular components described herein can, individually or in combination, have as their center point the intersection point of the main axis 9 with the clamping plane (e.g. center point of the opening 14).

[0067] Figure 5B shows an embodiment of the component according to the invention. The component comprises the annular elastic element 1a according to the invention and a housing part (here the upper housing part 3a made of Fig. 5A ), wherein the housing part 3a has an annular recess 11 for clamping the annular elastic element 1a, and wherein the housing part 3a has an inner surface defined by the recess 11 (cf. 105 in Fig. 7 ).

[0068] The annular recess 11 preferably defines an annular opening 12 in the housing part, wherein the annular opening is formed between a first annular edge 12a of the housing part and a second annular edge 12b of the housing part. The elastic element 1a can be clamped between the first annular edge 12a and the second annular edge 12b.

[0069] If the elastic element 1a is in contact with the first side surface (cf. 16c in Fig. 6C ) facing the inner surface through the opening 12 into the recess 11 and is clamped in the recess 11, the first pressure chamber 4 is formed between the inner surface and the elastic element 1a. The elastic element according to the invention has the means mentioned above, which allow a reliable use of the component in a humid environment. These means are described in connection with the Figures 6 to 12 explained in more detail.

[0070] As in the Figures 5C and 5DAs shown, the illustrated elastic element 1a of the spring 1 extends from a first contact surface 101 within the housing part 3a to a second contact surface 102 within the housing part 3a and can contact it. The first contact surface 101 is arranged radially further outward from the center of the opening 14 than the second contact surface 102.

[0071] Figure 5C shows the section of the Figure 5B illustrated housing part 3a in which the upper plate 1a of the spring 1 meets the first contact surface 101 and is preferably in contact with it. Figure 5D shows the section of the Figure 5Billustrated housing part 3a in which the upper plate 1a of the spring 1 meets the second contact surface 102 and is preferably in contact with it. However, it is also possible for one or more further components to be located radially between the elastic element 1a and one or more of the contact surfaces 101, 102, via which the elastic element 1a exerts its spring force on the contact surfaces 101, 102.

[0072] As in Figures 5B, 5DAs can be seen, the elastic element 1a is clamped in the recess 11 between the inner sides of the housing part 3a. Each of the plates of the spring 1 is inserted in the direction of the main axis 9 of the clamping devices 10 through the opening 12 into the recess 11 of the respective housing part during assembly along the inner surfaces of the housing part 3a until the respective plate abuts a stop 112, 122 at the end of each of the two contact surfaces 101, 102 and therefore cannot be inserted further into the recess 11. Since the expansion of the elastic element 1a in the clamping plane or in the radial direction of the annular recess can be greater than the expansion of the interior defined by the housing part, the plate 1a can be bent or prestressed in the pressure-free initial state.

[0073] In the drawings of the Figures 6A to 6Cembodiments of the means of the elastic element according to the invention for use in humid environments and the optional means for use in vacuum or clean room are presented in more detail.

[0074] Figure 6Ashows an annular elastic element 1a, 1b according to the invention for a clamping and / or braking device 10, the element 1a, 1b comprising: an annular spring plate 16, wherein the annular spring plate 16 has a first annular side surface 16c and a second annular side surface 16d; a first sealing element 17, wherein the first sealing element 17 is arranged on the first side surface 16c of the spring plate 16; a second sealing element 15, wherein the second sealing element 15 is arranged on the second side surface 16d of the spring plate 16, and wherein the second sealing element 15 forms an inner projection 15a in a region of an inner edge 16a of the annular spring plate 16 and an outer projection 15b in a region of an outer edge 16b of the annular spring plate 16, wherein the first sealing element 17 forms a first projection 17a.

[0075] The Figures 6B and 6Cshow that the first projection 17a is formed between the inner 16a and outer edge 16b of the annular spring plate 16; here, for example, the first projection 17a is formed in a region of the inner 16a or outer 16b edge of the annular spring plate 16.

[0076] Figures 6A and 6B further show that the first sealing element 17, preferably in a region of the outer edge 16b of the annular spring plate 16, forms an optional second projection 17b on the first side surface 16c.

[0077] Each of the projections 15a, 15b, 17a, 17b of the first and / or second sealing element 15, 17 can be annular, at least in sections, and extend annularly around the axis 9. Each of the projections 15a, 15b, 17a, 17b of the first and / or second sealing element 15, 17 can be fixed to the spring plate 16, preferably vulcanized, or can be arranged detachably from the spring plate 16, preferably as an O-ring.

[0078] Figures 6A and 6C also show that a longitudinal axis of the first projection 17a of the first sealing element 17 is (substantially) perpendicular to the first side surface 16c of the spring plate 16.

[0079] As in Figures 6B and 6C As shown, the inner projection 15a and / or outer projection 15b of the second sealing element 15 each has an at least partially flat surface 15e, 15f, which serves as a bearing surface, for example, against an (inner) housing wall or another elastic element in order to delimit and seal the second pressure chamber 2. These figures also show that the inner and / or outer projection 15a, 15b of the second sealing element 15 each forms, at least in sections, a radially extending bulge 15c, 15d.

[0080] Preferably, the bulge 15d of the outer projection 15b of the second sealing element 15 extends as shown in Figure 6Bshown, radially outward, preferably radially outward beyond the outer edge 16a of the spring plate 16. Preferably, the bulge 15d is adjacent or contiguous to the flat surface 15f. Preferably, the flat surface 15f merges into the bulge 15d.

[0081] Preferably, the bulge 15c of the inner projection 15a of the second sealing element 15 extends as shown in Figure 6C shown, radially inward, preferably radially inward beyond the inner edge 16a of the spring plate 16. Preferably, the bulge 15c is adjacent or contiguous to the flat surface 15e. Preferably, the flat surface 15e merges into the bulge 15c.

[0082] The first sealing element 17 and / or the second sealing element 15 may individually or both be made of an elastic material, preferably rubber or another suitable material, which is fixed (e.g. vulcanized) on the spring plate 16.

[0083] Figure 7 shows a housing part 3a, 3b of a component or device according to the invention, wherein the housing part 3a, 3b is an advantageous further development of the housing part 3a from Figure 5B In addition to the inner surface 105, the recess 11, the first contact surface 101, and the second contact surface 102, the housing part also has advantageous and preferred adaptations.

[0084] When the elastic element 1a, 1b is clamped in the recess 11 with the first side surface 16c facing the inner surface 105, the first projection 17a of the first sealing element 17 will establish a preferably sealing contact with a first portion of the inner surface 105 of the housing part 3a, 3b. The first portion may comprise an indentation or depression 106 of the housing part 3a, 3b. Preferably, the surface shapes of the first projection 17a and the first portion 106 are at least partially complementary in order to establish a particularly effective sealing contact.

[0085] When the elastic element 1a, 1b is clamped in the recess 11 with the first side surface 16c facing the inner surface 105, the second projection 17b of the first sealing element 17 will establish a preferably sealing contact with another section of the inner surface 105 of the housing part 3a, 3b. This other section can have an indentation or depression 107 of the housing part 3a, 3b. Preferably, the surface shapes of the second projection 17b and the section 107 are at least partially complementary in order to establish a particularly effective sealing contact. Each of the two projections 17a, 17b inhibits or completely prevents a fluidic connection between the first pressure chamber 4 and the surroundings of the housing, particularly in the region of the transition between two adjacent housing parts 3a, 3b.

[0086] The housing part 3a, 3b can comprise an annular recess 11 for clamping the annular elastic element 1a, 1b, wherein the recess 11 forms a first annular edge 12a and a second annular edge 12b of an annular opening 12 of the housing part 3a, 3b, wherein the annular recess 11 defines an inner surface 105 of the housing part 3a, 3b between the first annular edge 12a and the second annular edge 12b, wherein the inner surface 105 forms a first bevel 103 (or long chamfer) in the region of the first annular edge 12 and the inner surface 105 forms a second bevel 104 (or long chamfer) in the region of the second annular edge 12b, wherein the bevels 103, 104 are aligned such that the annular opening 12 enlarged towards the first and second edges 12a, 12b.

[0087] The inner surface 105 can form a first contact surface 101 and a second contact surface 102, which are designed to clamp the spring plate 16 of the elastic element 1a, 1b according to the invention therebetween, wherein the first bevel 103 is arranged between the first contact surface 101 and the first annular edge 12a, and wherein the second bevel 104 is arranged between the second contact surface 102 and the second annular edge 12b. When the elastic element 1a, 1b is clamped in the recess 11 with the first side surface 16c facing the inner surface 105, the bulges 15c, 15d are brought into preferably sealing contact with the bevels 103, 104.

[0088] As in Figure 7As shown, the first contact surface 101 can form a first bevel 103 (or called a long chamfer) or can merge into this and / or the second contact surface 102 can form a second bevel 104 (or called a long chamfer) or can merge into this, wherein the bevels 103, 104 are each preferably aligned such that the annular opening 12 or the recess 11 increases in size towards the first and second edges 12a, 12b (cf. Fig. 7 and 5B ). Each of these bevels 103, 104 largely prevents a force that would bend the clamping element 8 from being transmitted from the second sealing element 15 to the clamping element 8. Instead, the spring plate 16, or the inner edge 16a, primarily transmits the force for clamping or braking the object 5 to the clamping element 8 and the clamping surface 7. This protects the second sealing element 15 and makes the process of opening and closing the device more reliable.

[0089] To ensure additional, preferred tightness for use in a humid environment and / or in a vacuum environment or in a clean room, bulges 15c, 15d are provided, which fill the space at the bevels and come into contact with bevels 103, 104. Bulges 15c, 15d are advantageous for the tightness of the first pressure chamber 4 against the gap at the transition of the clamping elements 8 of adjacent housing parts 3a, 3b. The bulges at the housing edge with bevels 103, 104 are advantageous in that little or no medium flows in or out over the housing edge during operation of the first pressure chamber 4.

[0090] The flat surfaces 15e, 15f increase, on the one hand, the resistance to the permeability of a pressure medium (especially gases) when the second pressure chamber 2 is pressurized with the pressure medium. The flat surfaces 15e, 15f reduce or prevent the overflow of a medium between the first pressure chamber 4 and the second pressure chamber 2. The flat surfaces 15f and 15e also support the displacement of the bulges 15c, 15d against the bevels 103, 104 on the housing and thus the effects of the bulges described above. This support is particularly pronounced when, as in connection with the Figures 6B and 6CAs described, the flat surface 15e or 15f is adjacent to the associated bulge 15c or 15d and / or merges into it. The flat surfaces and the associated bulges thus form a combination of features that interact synergistically, but can also exist individually. For the purposes of vacuum operation, each of the sealing elements 17a and 17b is to be regarded as an additional barrier and supports the tightness of the first pressure chamber 4 against the environment.

[0091] The housing part 3a, 3b can have a preferably circular groove or notch 110 for receiving an O-ring. The groove or notch 110 can preferably completely encircle the housing part 3a, 3b along the circumference of the housing part in the region of the first annular edge 12a, or between an outer edge 100b of the housing part and the first contact surface 101 or the recess 11. Alternatively or additionally, the groove or notch 110 can preferably completely encircle the housing part 3a, 3b along the circumference of the housing part in the region of the second annular edge 12b, or between an inner edge 100a of the housing part and the second contact surface 102 or the recess 11.

[0092] Preferably, the housing part is made of a low-corrosive material. Figure 8 shows a clamping and / or braking device 10 according to the invention. In Figure 8is an example of a device 10 with an inwardly directed clamping effect as in the Figures 1A , 2A and 5A shown.

[0093] In Figure 8 The first projection 17a of the first sealing element 17 of at least one of the elastic elements 1a, 1b establishes a preferably sealing contact with a first portion (e.g., 106) of the inner surface 105 of one of the housing parts 3a, 3b, in order to at least inhibit a flow connection between a region of the first pressure chamber 4 and a transition between the housing parts 3a, 3b. The contact can be at least partially sealing against a medium, preferably a fluid or liquid, which penetrates from outside the device 10 through the gap at the transition between the housing parts 3a, 3b or clamping elements 8 into the housing 3.

[0094] The area of ​​the first pressure chamber 4 is in Figure 8between the first projection 17a of the first sealing element 17 of the at least one elastic element 1a, 1b and the outer edge 16b of the spring plate 16 of the at least one elastic element 1a, 1b, or the second projection 17b of the first sealing element 17 of the at least one elastic element.

[0095] The optional second projection 17b of the first sealing element 17 of at least one of the elastic elements 1a, 1b establishes contact with a second section (e.g. 107) of the inner surface 105 of the housing part 3a, 3b, wherein the second section of the inner surface 105 preferably lies between the first contact surface 101 and the second contact surface 102 of the housing part 3a, 3b. This projection can also reduce the fluidic connection of the first pressure chamber 4 with the area outside the clamping element 8. The inner surface 105 can have one or more indentations or depressions 106, 107, wherein the indentation or depression 106, 107 is preferably complementary in shape to the surface of the projection 17a, 17b contacting it.

[0096] From the overview of the Figures 6, 7 and 8It can be seen that the first contact surface 101 of each housing part 3a, 3b forms the first bevel 103 and the second contact surface 102 of each housing part 3a, 3b forms the second bevel 104, wherein the bulge 15c of the inner projection 15a of the second sealing element 15 of the first elastic element touches the second bevel 104 of the second contact surface 102 of the housing part 3a, 3b, and wherein the bulge 15d of the outer projection 15b of the second sealing element 15 of the first elastic element touches the first bevel 103 of the first contact surface 101 of the housing part 3a, 3b.

[0097] The first elastic element 1a and the second elastic element 1b are in Figure 8are clamped in the interior space 13 in such a way that the flat surfaces 15e of the inner projections 15a of the second sealing element 15 of the elastic elements 1a, 1b touch each other and / or the flat surfaces 15f of the outer projections 15b of the second sealing elements of the elastic elements 1a, 1b touch each other, in order to delimit the second pressure chamber 2 and to seal it, in particular during its application with pressure medium.

[0098] Figure 9 shows an embodiment of the elastic element 1a, 1b according to the invention with a first connection seal 30 and / or a second connection seal 20.

[0099] The annular spring plate 16 may be disposed between a portion of the second connection seal 20 and a portion of the first connection seal 30. The first connection seal 30 and the second connection seal 20 may be disposed on opposite portions of the inner edge 16a or outer edge 16b of the annular spring plate 16.

[0100] The first connection seal 30 and / or the second connection seal 20 can each be made of an elastic material, preferably rubber.

[0101] The first connection seal 30 can be offset at least in sections radially inwardly or outwardly relative to the inner edge 16a and / or outer edge 16b (cf. Fig. 9) of the spring plate 16 of the elastic element 1a, 1b. The first connection seal 30 can be part of the first sealing element 17 and / or the second sealing element 15. The first connection seal 30 can extend radially over the inner edge 16a or the outer edge 16b (cf. Fig. 9 ) protrude beyond.

[0102] The second connection seal 20 can be offset at least in sections radially inwards or outwards relative to the inner edge 16a and / or outer edge 16b (cf. Fig. 9 ) of the spring plate 16 of the elastic element 1a, 1b. The second connection seal 20 can be part of the first sealing element 17 and / or the second sealing element 15. The second connection seal 20 can extend radially over the inner edge 16a or the outer edge 16b (cf. Fig. 9 ) protrude beyond.

[0103] The Figures 11 and 12each show a section of the cross-section of the device 10 according to the invention. The left half and the right half of the Figures 11 and 12 each show a cross section of the elastic element 1a, 1b according to the invention according to Figure 9 installed in the housing part 3a, 3b according to Figure 10 . In this case, the elastic element 1a, 1b is clamped in the recess 11 between the inner edge 100a (or clamping element 8 with clamping surface 7) and the outer edge 100b of the housing part 3a, 3b in such a way that the first connection seal 30 comes into contact with the area of ​​the housing part 3a, 3b for the first connection I and the second connection seal 20 comes into contact with the area of ​​the housing part 3a, 3b for the connection II. This is carried out twice, so that two components according to the invention are prepared, which are then fastened together, as in the Figures 11 and 12 shown.

[0104] The Figure 11The section of the cross-section of the device 10 shown corresponds in its position to the Figures 9 and 10 indicated sections XI through the elastic element 1a, 1b and the housing part 3a, 3b in the region of the second connection seal 20. The second connection seal 20 has an edge along a second connection opening, wherein the edge serves to seal the second connection II of the clamping and / or braking device 10 for pressurizing the second pressure chamber 2 of the clamping and / or braking device 10 with a pressure medium. The second connection seal 20 forms a connection projection 21 along the edge of the second connection opening, which connection projection encircles the second connection opening at least partially and preferably completely.

[0105] The connection projection 21 of the second connection seal 20 forms a recess 22, at least in sections, on the edge of the second connection opening to reinforce the seal, particularly against the escape of pressure medium into the environment. The recess 22 of the second connection seal 20 reduces the risk of the second connection seal 20 lifting off the housing's flat surface, especially when pressurizing the first pressure chamber 4. In addition, the recess 22 avoids the use of sealing compound (adhesive) at this point. Such a sealing compound could have a negative impact on the vacuum or clean room.

[0106] The second connection seal 20 may form part of the inner or outer projection 15a, 15b of the second sealing element 15. The part of the projection of the second sealing element 15 formed by the second connection seal 20 may be arranged on a side of the second connection opening 20 that faces away from and / or is opposite a side of the second connection opening 20 on which the connection projection 21 is formed by the second connection seal 20.

[0107] The Figure 12 The section of the cross-section of the device 10 shown corresponds in its position to the Figures 9 and 10indicated sections XII through the elastic element 1a, 1b and the housing part 3a, 3b in the region of the first connection seal 30. The first connection seal 30 has an edge of a first connection opening, wherein the edge serves to seal the first connection I of the clamping and / or braking device 10 for pressurizing the first pressure chamber 4 of the clamping and / or braking device 10 with a pressure medium. The edge of the first connection seal 30 surrounds the first connection opening at least partially and preferably completely.

[0108] The first connection seal 30 can comprise an O-ring that surrounds the first connection opening. The bulge 15d of the projection 15b with the bevel 103, together with the first connection seal 30 at connection I, ensure that no fluids flow in or out over the housing edge when the first pressure chamber 4 is pressurized. In addition, this eliminates the need for unwanted sealing compounds (adhesives) between the housing halves. Such a sealing compound could have a negative impact on the vacuum or clean room.

[0109] Using the means described here, individually and in combination, terminals can be provided that can be operated reliably in humid environments and can also optionally be operated in a vacuum or in a clean room without negatively affecting the dynamics of opening and closing the terminal.

[0110] The description and figures describe preferred embodiments of the invention claimed by the appended claims. The optional features disclosed in the above description, claims, and drawings may be used both individually and in any combination to implement the invention claimed herein in its various forms according to the appended claims.

[0111] Several embodiments of the invention have been described.

Claims

1. An annular elastic element (1a, 1b) for a clamping and / or braking device (10), the element (1a, 1b) comprising: an annular spring plate (16), the annular spring plate (16) having a first annular side surface (16c) and a second annular side surface (16d); a first sealing element (17), the first sealing element (17) being arranged on the first side surface (16c) of the spring plate (16); and a second sealing element (15), the second sealing element (15) being arranged on the second side surface (16d) of the spring plate (16); characterized in that the second sealing element (15) forms an inner protrusion (15a) in a region of an inner edge (16a) of the annular spring plate (16) and forms an outer protrusion (15b) in a region of an outer edge (16b) of the annular spring plate (16), and in that the first sealing element (17) forms a first protrusion (17a).

2. The elastic element (1a, 1b) according to claim 1, characterized in that the first protrusion (17a) is formed between the inner and outer edges of the annular spring plate (16), preferably wherein the first protrusion (17a) is formed in a region of the inner (16a) or outer (16b) edge of the annular spring plate (16).

3. The elastic element (1a, 1b) according to any one of the preceding claims, characterized in that the first sealing element (17) further forms a second protrusion (17b), preferably between the inner and outer edges of the annular spring plate (16), particularly preferably in a region of the outer edge (16b) of the annular spring plate (16) on the first side surface (16c).

4. The elastic element (1a, 1b) according to any one of the preceding claims, characterized in that each of the protrusions of the first and / or second sealing element (15, 17) is annular at least in sections.

5. The elastic element (1a, 1b) according to any one of the preceding claims, characterized in that the first protrusion (17a) and / or the second protrusion (17b) of the first sealing element (17) has a surface that is rounded at least in sections.

6. The elastic element (1a, 1b) according to any one of the preceding claims, characterized in that a longitudinal axis of the first protrusion (17a) of the first sealing element (17) runs substantially perpendicular to the first side surface (16c) of the spring plate (16).

7. The elastic element (1a, 1b) according to any one of the preceding claims, characterized in that the inner and / or outer protrusion (15a, 15b) of the second sealing element (15) each has a surface that is planar at least in sections, which is preferably a bearing surface for sealing a pressure chamber (2).

8. The elastic element (1a, 1b) according to any one of the preceding claims, characterized in that the inner and / or outer protrusion (15a, 15b) of the second sealing element (15) each forms a bulge (15c, 15d) at least in sections.

9. The elastic element (1a, 1b) according to claim 8, characterized in that the bulge (15c) of the inner protrusion (15a) of the second sealing element (15) extends radially inwards, preferably radially inwards beyond the inner edge (16a) of the spring plate (16), and / or that the bulge (15d) of the outer protrusion (15b) of the second sealing element (15) extends radially outwards, preferably beyond the outer edge (16b) of the spring plate (16).

10. The elastic element (1a, 1b) according to claim 8 or 9, characterized in that the bulge (15c) of the inner protrusion (15a) is neighboring or adjacent to the planar surface (15e) of the inner protrusion (15a) and / or the bulge (15d) of the outer protrusion (15b) is neighboring or adjacent to the planar surface (15f) of the outer protrusion (15b).

11. The elastic element (1a, 1b) according to any one of the preceding claims, characterized in that the elastic element (1a, 1b) further comprises: a first port seal (30), which defines an edge of a first port opening of the first port seal (30), wherein the edge is suitable for sealing a first port (I) of the clamping and / or braking device (10) for applying a pressure medium to a first pressure chamber (4) of the clamping and / or braking device (10), preferably wherein the edge of the first port seal (30) at least partially and preferably completely surrounds the first port opening.

12. The elastic element (1a, 1b) according to any one of the preceding claims, characterized in that the elastic element (1a, 1b) further comprises: a second port seal (20), which defines an edge of a second port opening of the second port seal (20), wherein the edge is suitable for sealing a second port (II) of the clamping and / or braking device (10) for applying a pressure medium to a second pressure chamber (2) of the clamping and / or braking device (10), preferably wherein the second port seal (20) forms a port protrusion (21) along the edge of the second port opening, which at least partially and preferably completely surrounds the second port opening, wherein the port protrusion (21) of the second port seal (20) forms a rear grip (22) at least in sections on the edge of the second port opening.

13. A component for a clamping and / or braking device (10), the component comprising: the annular elastic element (1a, 1b) according to any one of the preceding claims; and a housing part (3a, 3b), wherein the housing part (3a, 3b) has an annular recess (11) for clamping the annular elastic element (1a, 1b), and wherein the housing part (3a, 3b) has an inner surface (105) defined by the recess (11); wherein, when the elastic element (1a, 1b) is clamped in the recess (11) with the first side surface (16c) facing the inner surface (105), the first protrusion (17a) of the first sealing element (17) is designed to make contact with a first section of the inner surface (105) of the housing part (3a, 3b).

14. The component according to claim 13, wherein the elastic element (1a, 1b) is clampable between a first contact surface (101) of the housing part and a second contact surface (102) of the housing part, and wherein the first section of the inner surface (105) lies between the first contact surface (101) and the second contact surface (102), preferably wherein the first contact surface (101) forms a first slope (103) and the second contact surface (102) forms a second slope (104), wherein the slopes (103, 104) are aligned such that the annular opening increases towards the first and second edges (12a, 12b).

15. A clamping and / or braking device (10) for clamping and / or braking an object to be clamped and / or braked, comprising: a first elastic element (1a) according to any one of the preceding claims and a second elastic element (1b) according to any one of the preceding claims; a housing (3) comprising a first housing part (3a) with an inner surface (105) and a second housing part (3b) with an inner surface (105), wherein the housing parts are arranged with respect to one another and fastened to one another such that the inner surfaces (105) of the housing parts (3a, 3b) together delimit an interior space within the housing (3); one or more clamping elements (8), each clamping element having a clamping surface (7); a spring (1), arranged in the interior space, comprising the first elastic element (1a, 1b) and the second elastic element (1a, 1b), wherein the elastic elements are arranged within the interior space such that a first pressure space (4) is formed in the interior space between the elastic elements (1a, 1b) and the inner surfaces (105) of the housing parts, wherein the first pressure space (4) can be deaerated and can be subjected to overpressure of a pressure medium that can be supplied to the housing, wherein the first elastic element (1a, 1b) is clamped in the interior space with the first side surface (16c) thereof facing the inner surface (105) of the first housing part (3a), and wherein the second elastic element (1a, 1b) is clamped in the interior space with the first side surface (16c) thereof facing the inner surface (105) of the second housing part (3b); wherein the spring (1) is designed such that, when the first pressure space (4) is aerated or deaerated or the first pressure space (4) is subjected to overpressure, a bending of at least one of the spring plates (16) of the elastic elements (1a, 1b) can be changed and thereby the device (10) changes between an open state, in which an object (5) to be clamped is spaced apart from the one or more clamping surfaces (7), and a closed state, in which at least one of the one or more clamping surfaces (7) transmits a clamping and / or braking force to the object (5); and wherein the first protrusion (17a) of the first sealing element (17) of at least one of the elastic elements (1a, 1b) is configured to make contact with a first section of the inner surface (105) of one of the housing parts (3a, 3b) in order thereby to at least inhibit a flow connection between a region of the first pressure space (4) and a transition between the housing parts (3a, 3b).

16. The device (10) according to claim 15, characterized in that the contact is at least partially sealing with respect to a medium, preferably a fluid or a liquid, which has entered the housing or the first pressure space (4) from the surroundings of the device through the transition of the housing parts, preferably in the region of the at least one clamping surface (7).

17. The device (10) according to claim 15 or 16, characterized in that the region of the first pressure space (4) is arranged between the first protrusion (17a) of the first sealing element (17) of the at least one elastic element and the inner or outer edge of the spring plate (16) of the at least one elastic element, or the second protrusion (17b) of the first sealing element (17) of the at least one elastic element.

18. The device (10) according to one of claims 15 to 17, characterized in that the first housing part is gripped behind by the rear grip (22) of the port protrusion (21) of the first elastic element and / or the second housing part is gripped behind by the rear grip (22) of the port protrusion (21) of the second elastic element.

19. The clamping and / or braking device (10) according to any one of the preceding claims, wherein the first elastic element (1a, 1b) is clamped between a first contact surface (101) of the first housing part and a second contact surface (102) of the first housing part, and wherein the first section of the inner surface (105) lies between the first contact surface (101) of the first housing part and the second contact surface (102) of the first housing part, and / or wherein the second elastic element (1a, 1b) is clamped between a first contact surface (101) of the second housing part and a second contact surface (102) of the second housing part, and wherein the first section of the inner surface (105) lies between the first contact surface (101) of the second housing part and the second contact surface (102) of the second housing part.

20. The clamping and / or braking device (10) according to claim 19, characterized in that the first contact surface (101) of the first housing part forms a first slope (103) and the second contact surface (102) of the first housing part forms a second slope (104), wherein the bulge (15c, 15d) of the inner protrusion (15a) of the second sealing element (15) of the first elastic element contacts the second slope of the second contact surface (102) of the first housing part, and wherein the bulge (15c, 15d) of the outer protrusion (15b) of the second sealing element (15) of the first elastic element contacts the first slope of the first contact surface (101) of the first housing part, and / or the first contact surface (101) of the second housing part forms a first slope (103) and the second contact surface (102) of the second housing part forms a second slope (104), wherein the bulge (15c, 15d) of the inner protrusion (15a) of the second sealing element (15) of the second elastic element contacts the second slope of the second contact surface (102) of the second housing part, and wherein the bulge (15c, 15d) of the outer protrusion (15b) of the second sealing element (15) of the second elastic element contacts the first slope of the first contact surface (101) of the second housing part.

21. The clamping and / or braking device (10) according to any one of the preceding claims, characterized in that the first elastic element (1a, 1b) and the second elastic element (1a, 1b) are clamped in the interior space such that the planar surfaces (15e, 15f) of the inner protrusions (15a) of the second sealing element (15) of the elastic elements contact each other and / or the planar surfaces (15e, 15f) of the outer protrusions (15b) of the second sealing elements of the elastic elements contact each other, preferably so as to delimit the second pressure chamber (2).

22. The clamping and / or braking device (10) according to any one of the preceding claims, characterized in that the second protrusion (17b) of the first sealing element (17) of at least one of the elastic elements is configured to make contact with a second section of the inner surface (105) of the housing part, preferably wherein the second section of the inner surface (105) lies between the first contact surface (101) and the second contact surface (102).

23. The clamping and / or braking device (10) according to any one of the preceding claims, characterized in that the first and / or second section is each an indentation or depression (106, 107) in the inner surface (105), preferably wherein the indentation or depression (106, 107) is complementary in shape to the surface of the protrusion contacting it.

24. The clamping and / or braking device (10) according to any one of the preceding claims, characterized in that each of the housing parts comprises a, preferably circular, rill or groove (110), wherein two contacting O-rings are received in the rills or grooves (110) between the housing parts, preferably wherein the rill or groove (110) of each housing part preferably completely surrounds along the circumference of the housing part between an outer edge (100b) of the housing part and the recess (11) or the first contact surface (101).