Control unit for operating a clamping nut

Abstract

Operating part (100; 200; 400) for actuating a clamping nut (20), wherein the operating part (100; 200; 400) has a terminal, annular receiving area for gripping the clamping nut (20), and wherein the terminal, annular receiving area comprises a plurality of grooves (101) running from the outside to the inside and lugs (102) located between the grooves, wherein the side flanks of the lugs (102) delimited by the grooves (101) are each provided with an undercut profile, characterized in that the terminal, annular receiving area has a centering edge (150; 250) which projects beyond the plane of the base surface of the grooves (101).

Description

Control unit for operating a clamping nut

[0001] The present invention relates to an operating part for actuating a clamping nut according to the preamble of claim 1. Furthermore, the invention relates to a clamping system which comprises at least one such operating part. State of the art

[0002] Clamping nuts are used, for example, to clamp collets, which are used to clamp tool shanks in the tool holder of a machine tool. Particularly in confined spaces and narrow access to the clamping nut, special precautions must be taken to ensure that the necessary force for clamping can be exerted. Conventionally, clamping is achieved using a wrench, which is equipped, for example, with pins that engage in hole-shaped recesses in the clamping nut, so that the clamping nut can be tightened using the wrench. The German utility model DE 296 08 677 U1, for example, describes a clamping nut with slot-shaped recesses for the engagement of the pins of a wrench.

[0003] To prevent the wrench from slipping, European patent application EP 1 052 047 A2 describes a clamping nut that provides groove-shaped recesses for engagement with the pins arranged on a clamping wrench. The grooves are designed with a dovetail-shaped cross-section, preventing the wrench from slipping due to the wrench pins, which have a complementary profile, engaging in the undercut of the grooves.

[0004] The German utility model DE 201 19 008 U1 also proposes a clamping system in which the grooves arranged on the face of the clamping nut have a dovetail-shaped cross-section. The inner edges of the grooves run radially, so that the grooves taper evenly toward the center of the clamping nut. The system also includes a wrench with a wrench head featuring appropriately shaped lugs for engaging the grooves of the clamping nut. This system is intended to prevent the wrench from tipping and slipping out, and the associated risk of breakage and slipping, when operating the clamping nut.

[0005] Other undercut shapes for comparable clamping nuts have also been described. For example, German patent application DE 103 02 529 A1 discloses a comparable clamping nut in which the grooves feature an S-shaped undercut profile. While the undercut profile of the grooves can achieve a certain degree of stabilization of the nut on the wrench, it cannot completely prevent the nut from slipping out of the wrench sideways.

[0006] German patent application DE 10 2009 006 520 A1 describes a clamping system with a clamping nut and a wrench, wherein the clamping nut has recesses on its front side designed to accommodate projections of the wrench. The recesses are arranged either on the outer edge or on the inner edge of the clamping nut, with the opposite edge, i.e. the inner edge or the outer edge, being closed. This allows the projections of the wrench to engage either from the outside or from the inside and be inserted into the recesses of the clamping nut. The recesses of the clamping nut are provided with at least one undercut for the projections of the wrench to engage behind or under. This ensures slip-free engagement of the wrench. In particular, the undercut prevents the clamping nut from falling out of the wrench.

[0007] In addition to a conventional wrench with an elongated basic shape and a wrench head equipped with appropriate geometries for engaging the structures of the clamping nut, other wrench shapes or, in general, other operating elements can also be used to tighten and loosen such clamping nuts. Sockets, especially torque sockets, play an important role in this context.

[0008] A socket generally describes a tool part that creates a connection between a wrench, such as a ratchet wrench, and the respective nut, bolt, or other threaded fastener. On one side of the socket, a receptacle for connecting to the wrench, such as an external hexagon or an internal square, is formed. On the other side of the socket, a geometry is provided that is adapted to the shape of the nut, bolt, or other threaded fastener to be gripped.

[0009] The aforementioned DE 10 2009 006 520 A1 also discloses a socket with an external hexagon at one end. The other end features the aforementioned projections, which are designed to engage the correspondingly shaped recesses in the clamping nut.

[0010] Another frequently useful tool for clamping nuts is the so-called driver, which also features an external hexagon, for example, and a geometry on the other side for gripping the clamping nut. Compared to a socket, a driver is generally shorter.

[0011] The system described in DE 10 2009 006 520 A1 provides a satisfactory solution for many applications, allowing user-friendly and safe operation of a clamping system. However, there is always a need for alternative systems.

[0012] Against this background, the invention aims to provide an operating unit for working with a clamping nut. The operating unit should be simple in design, yet still allow slip-free and secure insertion and tightening of a clamping nut with minimal effort. Disclosure of the invention

[0013] This object is achieved by an operating element for actuating a clamping nut, as described in claim 1. The object is further achieved by a clamping system, as defined in the further, subordinate claim. Preferred embodiments of the operating element are defined in the subclaims.

[0014] The control unit is primarily characterized by the fact that it has no external and / or internal thread. It is designed for operation or working with a clamping nut, whereby the clamping nut itself can be used to clamp a collet, which can be used to clamp tool shanks in the tool holder of a machine tool.

[0015] The clamping nut itself is usually ring-shaped and has an external or internal thread. The thread generally serves to screw the clamping nut into a machine tool spindle or tool holder. Furthermore, the clamping nut can be conventionally provided with an internal cone for centered gripping of a collet.

[0016] The operating part according to the invention has a terminal, annular receiving area for gripping the clamping nut. For this purpose, the terminal receiving area has a plurality of grooves that run from the outside to the inside. Lugs are formed between the grooves. The side flanks of the lugs that are bordered by the grooves or run from the outside to the inside are each provided with an undercut profile.

[0017] The clamping nut to be gripped has, on the side facing the operating element, a plurality of lugs with grooves between them. The side flanks of the grooves, running from the outside to the inside, are provided with a profile that allows the lugs of the operating element to engage in the grooves and hook the operating element into place.

[0018] Preferably, the operating part for the clamping nut according to the invention is a hollow cylindrical operating part.

[0019] A key aspect of the invention is that the annular receiving area of the operating part according to the invention has a centering rim that projects beyond the plane of the base surface of the grooves. This centering rim significantly improves the stability of the connection between the clamping nut and the respective operating part compared to conventional systems. The centering rim facilitates and stabilizes gripping of the clamping nut, preventing the clamping nut from slipping or falling off the operating part.

[0020] The centering edge can be arranged in the inner region of the terminal, annular receiving area or in the outer region of the terminal, annular receiving area. In particularly preferred embodiments, the centering edge is arranged in the inner region of the terminal, annular receiving area.

[0021] Preferably, the profile of the side flanks of the noses of the operating part is adapted to the profile of the grooves or noses of the clamping nut in such a way that a positive engagement is achieved. These profiles are preferably complementary. This allows the connection between the operating part and the clamping nut to be designed to be particularly slip-resistant, thus reliably preventing the clamping nut from falling off the operating part. Furthermore, the positive engagement enables particularly efficient torque transmission when tightening or loosening the clamping nut.

[0022] However, it is also possible that the profile of the side flanks of the noses of the operating part is not optimally adapted to the profile of the grooves or the side flanks of the noses of the clamping nut. Even in this case, the centering edge provided according to the invention ensures that the clamping nut can be reliably gripped by the operating part.

[0023] In particularly preferred embodiments of the operating element according to the invention, the undercut profile of the side flanks of the noses of the operating element is a rectangular profile. Particularly advantageously, in these embodiments, the clamping nut is also equipped with a corresponding rectangular profile in the side flanks of its noses. However, other undercut profiles in the side flanks of the noses of the operating element (and the clamping nut) are also possible, for example, S-profiles or other types.

[0024] In particularly preferred embodiments, 3-8 lugs, preferably six, are provided in the terminal, annular receiving area of the operating part. The lugs are preferably evenly distributed around the circumference of the operating part. It may be preferable for the side flanks of the lugs of the operating part to extend radially inward, so that both the lugs and the grooves taper inward.

[0025] Particularly preferably, the control unit is constructed in at least two parts. In these embodiments, the control unit according to the invention comprises (i) a base body comprising the terminal, annular receiving area with the grooves and the noses, and (ii) a hollow cylindrical centering ring forming the centering edge.

[0026] In the case of the centering rim in the inner area, the centering ring extends into the interior of the base body. In the case of the centering rim in the outer area, the centering ring extends along the outer circumference of the base body.

[0027] This design of the operating element according to the invention allows for particularly advantageous manufacturing of the operating element. The base body can expediently be made of a hardened material, for example, hardened steel. Sufficient material hardness is advantageous because the base body, and in particular the annular receiving area with the lugs, can be subjected to considerable loads during torque transmission during tightening or loosening of the clamping nut. The centering ring, on the other hand, is subjected to less significant loads, so the use of a hardened material for the centering ring is of secondary importance.

[0028] Furthermore, it is preferred if the operating element, and in particular the base body, is coated or otherwise treated to protect against corrosion. For example, galvanization of the steel used for the base body can be provided.

[0029] In particularly preferred embodiments, the centering ring is made of stainless steel. Stainless steel is corrosion-resistant and durable, making it a highly suitable material for the centering ring. Furthermore, the centering ring can be manufactured from stainless steel with particularly high precision and accuracy. It is also possible for the entire control element to be made of stainless steel. However, particularly for cost reasons, it may be advantageous to manufacture the base body from hardened steel and the centering ring from stainless steel.

[0030] In other embodiments, the centering ring can be made of other steel or non-ferrous metal or plastic, for example.

[0031] In preferred embodiments of the operating element according to the invention, the centering ring can be pressed into a snug fit on an inner, annularly extending shoulder of the base body. This design allows for simple yet highly precise production of the operating element with the centering rim arranged on the inside. In a similar manner, a snug fit can also be used for attaching an outer centering rim.

[0032] However, it is also possible for the operating part according to the invention to be manufactured as a one-piece piece, in which the centering edge is directly integrated into the base body.

[0033] The base body of the control element according to the invention, with or without an integrated centering ring, can be manufactured, for example, as a cast part, in particular as an investment casting. The structures of the base body in the area of the lugs and grooves of the receiving area can be produced, for example, by lost-wax or die-casting processes or, preferably, by computer-aided machining processes, for example on CNC machines. Furthermore, it is possible, for example, to produce the control element with or without an integrated centering ring using 3D printing.

[0034] In particularly preferred embodiments of the operating part according to the invention, the operating part is characterized in that the outer end of the centering edge is located below the plane of the outer surfaces of the noses, i.e., the outer surfaces of the noses in the axial direction. This means that the noses are slightly longer than the height of the centering edge. This design of the operating part is based on the fact that a collet chuck usually has a certain undersize clamping. The reduced height of the centering edge and the resulting clearance prevent the front of the collet chuck from striking the operating part directly and thus becoming blocked when the clamping nut is tightened.

[0035] Depending on the dimensions of the clamping system, the outer edge of the centering edge can be set back, for example, between 0.5 and 1.0 mm relative to the plane of the outer surfaces of the lugs. In a commercially available clamping system, the centering edge of the operating part can preferably be 0.4 to 0.6 mm, particularly preferably 0.5 mm, shorter than the height of the lugs.

[0036] In particularly preferred embodiments of the operating part according to the invention, the end of the operating part opposite the receiving area with the lugs is provided with an external hexagon or square, or, for example, an internal square. The area with the external hexagon or square, or the internal square, serves in particular as an engagement area for an operating tool, for example, a torque wrench.

[0037] In particularly preferred embodiments, the operating part according to the invention is designed as a socket, with a shaft of varying length being provided between the receiving area with the lugs and the centering edge on one side and the area for engagement of an operating tool on the other side. The length of the socket or the length of the shaft is preferably adapted to the respective use of the socket. In particular, the length of the socket depends on the length of the tool shaft, which is to be clamped into a collet using the operating part.

[0038] Depending on the length of the socket, it may be advantageous to design the socket with weight-reducing features. In particular, three, four, or more elongated holes can be provided in the socket shaft. In addition to the associated weight reduction, the elongated holes also have the advantage of allowing the tool shaft, which runs inside the socket, to be visible to the operator during the clamping process.

[0039] As a further weight-reducing measure, one or more millings can be made, particularly on the shaft of the operating part, for example as a circumferential tapered ring, which reduces the wall thickness and thus the weight of the socket.

[0040] In particularly preferred embodiments, the socket is designed as a torque socket. In this embodiment, the socket is intended to establish the connection with a torque wrench. By preventing the torque socket from slipping off the clamping nut due to the centering edge provided according to the invention, particularly safe working with the torque socket is possible. Furthermore, the torque socket ensures a certain distance between the operator and any sharp-edged tools of the machine tool, thus also reducing the risk of injury to the operator.

[0041] In further preferred embodiments, the socket is designed as a multi-part socket, in particular as a modular socket. The multi-part socket comprises a base holder and a replaceable part (operating element), wherein the replaceable part comprises the terminal, annular receiving area and the centering edge according to the above description.

[0042] Preferably, the replaceable part (operating element) is connected to the base holder by means of a union thread connection, in particular by means of a cam-union thread connection. The cam-union thread connection allows for a particularly stable connection between the two elements.

[0043] The replaceable part (operating element) with the terminal, annular receiving area and the centering rim is subject to a certain amount of wear. This multi-part socket design allows only the replaceable part, i.e., the wearing part, to be replaced when necessary. This has the advantage for the user that the entire socket does not have to be replaced. This design therefore represents a very cost-effective solution for the user.

[0044] Furthermore, the basic holder can be designed in such a way that the entire range of clamping nuts of different sizes can be operated with two or three basic holder sizes together with, if necessary, several different interchangeable parts (operating elements).

[0045] In other embodiments of the operating unit, the operating unit is a screwing aid. The screwing aid differs from the socket in particular in that the screwing aid does not have a pronounced shank and is therefore generally shorter than a socket. Using the screwing aid can make placing the clamping nut on the collet considerably easier, as the space for handling in the area of the collet is often tight and difficult to reach with the hands. After screwing in the clamping nut with the help of the screwing aid, you can switch to the torque socket so that the clamping nut can be tightened effectively and without injury.

[0046] As further embodiments of the operating part according to the invention, for example, extensions or plug-in sleeves can be designed accordingly with the above-described receiving area with grooves, noses and a centering edge.

[0047] The invention further comprises a clamping system for working with a collet or for clamping tool shanks using a collet. The system comprises at least one clamping nut and at least one operating element as described above. The operating element is preferably designed as a socket or as a screwing aid. The system preferably comprises both at least one socket and at least one screwing aid. Preferably, several sockets of different lengths are included in the system.

[0048] Furthermore, the system may optionally include one or more conventional wrenches equipped with corresponding lugs or projections on a part-circular wrench head for engaging the corresponding structures of the clamping nut. With such a wrench, the clamping nut can be manually tightened or loosened as needed.

[0049] Further features and advantages of the invention will become apparent from the following description of exemplary embodiments in conjunction with the drawings. The individual features can be implemented individually or in combination with one another. Short description of the drawings

[0050] In the drawings shows: Fig. 1 Oblique view of a clamping system with collet, clamping nut and operating part according to the invention; Fig. 2 Operating part according to the invention in an embodiment as a screwing aid with an internally arranged centering edge - oblique view from below (A), longitudinal section (B), top view from below (C); Fig. 3 Clamping nut - oblique view from above (A), longitudinal section (B), top view (C); Fig. 4 Operating part according to the invention in an embodiment as a socket - oblique view from below (A), longitudinal section (B), top view from below (C), top view (D); Fig. 5 Control element according to the invention in an embodiment as a screwing aid in various configurations A - D, each in longitudinal section (right) and in plan view from below (left); Fig. 6 different undercut profile shapes of the noses (A - I) of the operating part according to the invention; Fig. 7 keys in top view from below (A) and in longitudinal section (B); Fig. 8 shows an operating part according to the invention in an embodiment as a modular socket with a base holder and a replaceable part in an oblique view of the two parts in assembled form (A) and in separated form (B) as well as a sectional view of the replaceable part in isolated form (C); and Fig. 9 Operating part according to the invention in an embodiment as a screwing aid with an externally arranged centering edge - oblique view from below (A), longitudinal section (B), top view from below (C). Embodiments of the invention

[0051] Fig. 1 shows a clamping system with a collet 10 for clamping a tool shank 11, a clamping nut 20, and an operating element 100 according to the invention. The operating element 100 is designed in the form of a screwing aid. On the side facing the clamping nut 20, the operating element 100 is provided with a plurality of lugs 102. The lugs 102 each have an undercut profile on their side flanks running from the outside to the inside. The lugs 102 of the operating element 100 are provided for positive engagement in corresponding grooves 21 of the clamping nut 20, so that the operating element 100 can engage in the clamping nut 20 and efficient torque transmission is possible.

[0052] Out of Fig. 2 shows further details of the control element 100 according to the invention. The oblique view from below shown in partial figure A reveals the six lugs 102 in the lower annular receiving area of the control element 100. Six grooves 101 extend between the lugs 102. The respective side flanks of the lugs 102, running from the outside to the inside, have an undercut profile, in this case a rectangular profile.

[0053] An external hexagon 110 is formed on the side of the operating part 100 opposite the receiving area. The operating part 100 can be operated using a corresponding wrench via the external hexagon 110. Alternatively, the operating part 100, particularly in this embodiment as a screwing aid, can also be grasped by hand in the area of the external hexagon 110.

[0054] As an essential feature of the invention, the operating element 100 is equipped with an inner centering rim 150. The centering rim 150 projects beyond the plane of the base surface of the grooves 101. The centering rim 150 prevents the operating element 100 from slipping sideways and / or tilting when being positioned and gripped by the clamping nut. The centering rim 150 therefore significantly simplifies and stabilizes the positioning and connection of the operating element 100 to the clamping nut. Compared to conventional clamping systems, the operating element 100 according to the invention can improve the handling of the system and reduce the risk of injury to the operator.

[0055] Part B of the Fig. Figure 2 shows a longitudinal section through the operating part 100. The two-part design with the centering ring 151 pressed into the interior of the hollow cylindrical operating part 100 by means of a tight fit can be seen. The pressed-in centering ring 151 forms the centering edge 150. The centering edge 150 projects beyond the plane of the base surface of the grooves 101. The height of the centering edge 150 is slightly lower than the height of the lugs 102.

[0056] The Fig. C the Fig. 2 shows a top view of the underside of the operating part 100 with the lugs 102, the grooves 101 therebetween and the inner centering edge 150.

[0057] To illustrate the clamping system as a whole, the Fig. 3 a clamping nut 20. Partial figure A shows an oblique view from above. The annular clamping nut 20 is generally provided with an external thread (not shown here) or with an internal thread. On its upper side, the clamping nut 20 is provided with a plurality of lugs 22 and grooves 21 located therebetween. The lugs 22 have an undercut profile on their respective side flanks. In this exemplary embodiment, an undercut rectangular profile is formed on the side flanks of the lugs 22 or on the side flanks of the grooves 21.

[0058] In part B of the Fig. 3 shows the conical area 25 formed inside the clamping nut 20, which is intended for the precise insertion of a collet. The top view in part C of the Fig. 3 shows the arrangement of the lugs 22, which are evenly distributed over the circumference of the annular clamping nut 20.

[0059] Fig. Figure 4 shows the operating part 200 according to the invention in a further, particularly preferred embodiment as a socket. Partial figure A shows an oblique view from below and partial figure B a longitudinal section. The lower receiving area with the lugs 102 and the grooves 101 located therebetween as well as the inner centering edge 150 and the centering ring 151 corresponds to the Fig. 2 shown receiving area of the control unit 100 shown there in the form of a screwing aid.

[0060] Even in this embodiment of the operating unit 200 as a socket, the centering rim 150 prevents a clamping nut from slipping off the socket. The centering rim 150 therefore facilitates handling of the system and reduces the risk of injury.

[0061] Even with the Fig. The operating part 200 shown in Figure 4, in the form of a socket, has an external hexagon 110 formed in the upper area of the operating part. In this case, the external hexagon 110 serves in particular for connection to a torque wrench for tightening and loosening a clamping nut.

[0062] Between the area with the external hexagon 110 and the receiving area with the lugs 102, the operating part 200 has a shaft 210. The shaft 210 has several elongated holes 211 (four elongated holes) that allow the operator to see the tool shaft located inside the socket when clamping the collet.

[0063] Furthermore, the elongated holes 211 achieve a reduction in material, which reduces the weight of the operating part 200.

[0064] As a further measure, in particular for weight reduction, a circumferential taper 212 is provided in this embodiment, which is associated with a reduction in the wall thickness of the hollow cylindrical operating part 200.

[0065] The Fig. C the Fig. Figure 4 shows a view from below, in which the lugs 102, the intermediate grooves 101 and the centering edge 150 can be seen. Fig. D the Fig. 4 shows a top view of the control panel, showing the area with the external hexagon 110.

[0066] The sub-figures A - D of the Fig. 5 show various exemplary embodiments of the lugs 102 and the grooves 101 located therebetween in the operating part 100 according to the invention. The embodiment of the operating part shown here is a screwing aid. In a corresponding manner, the operating part can be used as a socket, in particular as a torque socket as in Fig. 4. A sectional view is shown on the right, showing the centering ring 151 pressed into the interior of the operating part 100. The edge of the centering ring 151, which protrudes above the plane of the base surface of the grooves 101 on the side of the lugs 102, forms the centering edge 150.

[0067] The sub-figures A - I of the Fig. 6 show various possible undercut profiles in the side flanks of the lugs 102 of the operating part 100, 200 according to the invention. The respective undercut profile extends perpendicular to the radial alignment of the side flanks of the lugs 102.

[0068] For example, the Fig. C the Fig. 6 the particularly preferred rectangular profile. Part B of the Fig. 6 shows the dovetail profile known from the prior art and the partial figure A of the Fig. 6 shows the S-profile known from the state of the art.

[0069] The noses of the respective clamping nuts are also preferably provided with the corresponding profile to achieve optimal form fit. However, certain deviations in the respective profiles may be tolerable under certain circumstances.

[0070] Fig. Figure 7 shows a view from below (partial figure A) and a longitudinal section view (partial figure B) of a wrench 300 with which a clamping nut of the clamping system can be loosened or tightened by hand. The wrench has a handle 310 and a wrench head 320. The wrench head 320 is formed by a part-circular collar on which several lugs 302 are located as projections. In this exemplary embodiment, there are five lugs that are evenly distributed over the circumference of the part-circular collar. The lugs 302 are preferably formed with a corresponding undercut profile like the lugs of the respective clamping nut and / or like the lugs of the respective operating part according to the invention.

[0071] Fig. Figure 8 shows a multi-part (modular) socket 400, which is formed by a base holder 420 and a replaceable part (operating element) 410. The replaceable part 410 comprises a terminal, annular receiving area with a plurality of lugs 102 and grooves 101 therebetween, as well as an inner centering edge 150 according to the above description. The function of the modular socket 400 is similar to the socket 200, which is shown in FIG. Fig. 4. The corresponding elements of the modular socket 400 are provided with the same reference numerals.

[0072] The main advantage of the modular socket 400 is that the interchangeable part 410 can be replaced, for example, in the event of wear, without having to replace the entire socket. Furthermore, the modular socket 400 can be designed so that different sizes of clamping nuts can be accommodated by corresponding sizes of the interchangeable part 410. Furthermore, different sizes of the base holder 420 can be provided, so that all requirements can be covered cost-effectively with such a modular system.

[0073] The interchangeable part 410 is connected to the base holder 420 via a cam-threaded connection 425. Partial figure A shows the multi-part socket 400 in assembled form. Partial figure B shows the base holder 420 and the interchangeable part 410 in separated form, with the cam 426 for the cam-threaded connection 425 visible.

[0074] The Fig. C the Fig. Figure 8 shows a sectional view of the replaceable part (operating element) 410. This illustration shows the centering ring 151 arranged inside the part 410. The centering ring 151 forms the centering edge 150.

[0075] Fig. 9 shows in a similar way how Fig. 2 shows an embodiment of the operating part 100 as a screwing aid. In contrast to the embodiment of Fig. 2 with an inner centering edge, the embodiment of the Fig. 9 has an outer centering edge 250. The outer centering edge 250 is formed in this embodiment by an externally mounted, hollow cylindrical centering ring 251. Otherwise, the Fig. 9 shown screwing aid of the screwing aid of the Fig. 2 and reference is made to the comments on Fig.2. An externally seated centering edge 250 can also be used in the other embodiments explained above as an alternative to an internally seated centering edge. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 296 08 677 U1

[0002] EP 1 052 047 A2

[0003] DE 201 19 008 U1

[0004] DE 103 02 529 A1

[0005] DE 10 2009 006 520 A1 [0006, 0009, 0011]

Claims

[1] Operating part (100; 200; 400) for actuating a clamping nut (20), wherein the operating part (100; 200; 400) has a terminal, annular receiving area for gripping the clamping nut (20) and wherein the terminal, annular receiving area comprises a plurality of grooves (101) which run from the outside to the inside and lugs (102) located between the grooves, wherein the side flanks of the lugs (102) delimited by the grooves (101) are each provided with an undercut profile, characterized by that the terminal, annular receiving area has a centering edge (150; 250) which projects beyond the plane of the base surface of the grooves (101). [2] Control unit according to claim 1, characterized by that the centering edge (150) is arranged in the inner region of the terminal, annular receiving region. [3] Control unit according to claim 1, characterized bythat the centering edge (250) is arranged in the outer region of the terminal, annular receiving region. [4] Control unit according to one of claims 1 to 3, characterized by that the undercut profile of the side flanks of the noses (102) is a rectangular profile. [5] Control unit according to one of the preceding claims, characterized by that the control unit (100; 200; 400) is constructed in at least two parts and (i) comprises a base body having the terminal, annular receiving area with the grooves (101) and the lugs (102), and (ii) comprises a hollow cylindrical centering ring (151; 251) which forms the centering edge (150; 250) and which extends into the interior of the base body or extends on the outer circumference of the base body. [6] Control unit according to claim 5, characterized by that the centering ring (151; 251) is made of stainless steel. [7] Control unit according to claim 5 or claim 6, characterized by that the centering ring (151) is pressed into a tight fit on an inner, annularly extending shoulder of the base body. [8] Control unit according to one of the preceding claims, characterized by that the outer end of the centering edge (150; 250) is located below the plane of the outer surfaces of the noses (102). [9] Control unit according to one of the preceding claims, characterized by that the end of the operating part opposite the receiving area is provided with an external hexagon (110) or an internal square. [10] Control unit according to one of the preceding claims, characterized by that the operating part (200; 400) is a socket. [11] Control unit according to claim 10, characterized by that the socket is a torque socket. [12] Control unit according to claim 10 or claim 11, characterized bythat the socket is a multi-part socket (400) which comprises a base holder (420) and an exchangeable part (410) with the terminal, annular receiving area and the centering edge (150; 250) according to one of claims 1 to 9. [13] Control unit according to claim 12, characterized by that the replaceable part (410) is connected to the base holder (420) by means of a union thread connection (425). [14] Control unit according to one of claims 1 to 9, characterized by that the operating part (100) is a screwing aid. [15] Clamping system for working with a collet chuck (10), comprising at least one clamping nut (20) and at least one operating part (100; 200, 400) according to one of claims 1 to 14, in particular at least one screwing aid and / or at least one socket, and optionally at least one key (300) for manually actuating the clamping nut.

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