WO2013116886A1

WO2013116886A1 - Bending tool having a safety device

Info

Publication number: WO2013116886A1
Application number: PCT/AT2013/050030
Authority: WO
Inventors: Thomas Denkmeier; Bernhard Fischereder; Alfred HASELBÖCK; Richard SCHRAMMEL
Original assignee: Trumpf Maschinen Austria Gmbh & Co. Kg.
Priority date: 2012-02-07
Filing date: 2013-02-06
Publication date: 2013-08-15
Also published as: EP2812134B1; AT511591B1; AT511591A4; EP2812134A1

Abstract

The invention relates to a bending tool (1) for inserting into a tool receptacle (13), comprising a tool body (3), a bolt element (6), which is adjustable therein, for securing the bending tool (1) in the tool receptacle (13), two actuating surfaces (8, 11) which are accessible from opposite lateral surfaces (9, 10) on the tool body (3) and are arranged on at least one actuating element (7) which is adjustable between a basic position (25) corresponding to the locking position (15) of the bolt element (6) and an actuating position (27) corresponding to the unlocking position (20) of the bolt element (6), and wherein an adjustment of the actuating element (7) is converted into a movement of the bolt element (6) by means of a coupling means (21). In this case, the coupling means (21) extends from the actuating element (7) to the bolt element (6) and comes into contact with a transmission surface (30) on the actuating element (7) and a contact surface (32) on the bolt element (6), and furthermore the coupling means (21) is guided in a displaceable manner in the tool body (3) between the actuating element (7) and the bolt element (6) in the spacing direction between the actuating element (7) and the bolt element (6).

Description

Bending tool with safety device

The invention relates to a bending tool according to the preamble of claim 1.

Performing different bending tasks on a bending machine in many cases requires a change between different bending tools, for which a release of the tool clamping in the tool holder is required. In the case of heavy bending tools, the tool change is usually carried out by threading or threading in the end face of a press beam or press table. With tools of low to medium weight, a tool change is often performed by removing and inserting down or up, which is faster and easier to perform. However, so that a bending tool can not fall unexpectedly and uncontrollably from the tool holder when releasing the clamping, safety devices are frequently provided in such bending tools, in which a locking element engaging positively in a recess in the tool holder must be actively unlocked.

Such a bending tool is known, for example, from document EP 0 494 714 A1. Therein, an arrangement for actuating the locking element is shown in Figure 8, in which two accessible from opposite side surfaces actuating elements are coupled via a rotary body and one of the actuating elements is coupled via a pivot lever element with the locking element. By arranged on opposite side surfaces actuating elements can be done in such a bending tool unlocking regardless of the orientation of the bending tool in the tool holder comfortably from the operator side in front of a bending press. The central axes of the actuating elements are relatively widely spaced from each other, since between the rotary body is still arranged. Such an embodiment of a safety device with a rotary body and a pivot lever element can not be used because of the large space requirement in bending tools with low bending edge length, although just as fast and comfortable changing process is sought in these bending tools with low weight. The object of the invention is to provide a bending tool with a safety device that can also be designed with small bending edge lengths and ensures a reliable unlocking function in the application. The object of the invention is achieved by a generic bending tool with the characterizing features of claim 1.

Due to the fact that the coupling means extends from the actuating element to the locking element and contacts a transfer surface on the actuating element and a contact surface on the locking element and at the same time the coupling means between the actuating element and locking element is mounted displaceably in the tool body substantially in the direction of the distance between the actuating element and the locking element, the number of For the movement coupling between actuator and locking element required components to only one coupling means minimized and thereby also the required installation space for the non-positive connection between the actuating element and locking element can be minimized, especially since the coupling means essentially performs only a linear movement.

An advantageous embodiment of the bending tool can consist in that the actuating surfaces are formed by two actuating elements mounted in the tool body and acting on the coupling means. A displacement of the one actuating surface in this case does not necessarily cause a corresponding movement of the second actuating surface on the opposite side surface, as would be the case with a single, rigidly connected actuator. The actuators can be structurally simpler and easier to produce in this case. Furthermore, the installation or removal of the actuating elements can be simpler.

A reliable transmission of motion between actuating movement and locking element is provided if the coupling means is formed by a coupling element contacting the transmission surface with a first control surface and contacting the contact surface with a second control surface. The coupling element as a largely rigid body, which contacts both actuator and locking element transmits the movements substantially free of play. Possibly contained within the coupling element minor elastic properties are to be kept so small that the forces required for the unlocking movement of the locking element can still be reliably transferred to this. The coupling element can be mounted displaceably in a corresponding recess or a separate bearing bush in the tool body.

A possible development may consist in that the actuating element from the basic position in two opposite to this oriented actuating positions is adjustable and it has two surfaces accessible from opposite side surfaces on the tool body sflächen. Further, if the transfer surface comprises two differently oriented transfer faces cooperating with two differently oriented control sub-faces on the coupling element, an unlocking of the locking element from both side faces with a similar actuation movement, e.g. by applying a compressive force, possible. An inventive bending tool, regardless of its installation position from the front of the machine, e.g. by means of a programmable handling s device for workpieces or even from the back of the machine by means of a programmable backgauge unlocked and changed in a row or usually standing on the machine front operator can unlock the bending tool regardless of the mounting position of the front. The differently oriented transmission surfaces cause different directions of movement of the actuating element are possible and either the same adjustment movement of the coupling element is effected in both directions of actuation or depending on the actuation direction, a different adjustment movement of the coupling element is effected.

The same advantageous effect can be achieved that in the tool body, as already described above, two actuating elements are mounted adjustable with opposite sides of the tool body accessible actuating surfaces having mutually differently oriented transmission surfaces, which cooperate with two mutually differently oriented control sub-surfaces on the coupling element , The two transmission surfaces correspond in their effect to the two transmission sub-surfaces of the embodiment described above. If the coupling element is adjustable from its basic position corresponding to the locking position of the Rie gelgelelement into two actuating positions oriented opposite thereto, and the second control surface comprises two control partial surfaces oriented differently with respect to one another, which interact with two differently oriented contact partial surfaces on the locking element, However, an alternate adjustment movement can still be converted into a movement of the locking element, which leads from the locking position to the unlocked position.

For the practical substitutability of the bending tool, a simple production and for favorable ratios and force relationships between the moving elements, it is advantageous if the adjustment of the coupling element is approximately perpendicular to the adjustment of the actuating element and the adjustment of the locking element. For the same reasons, it is also advantageous if the adjustment directions of the actuating element, coupling element and locking element lie in a common plane.

The bending tool may further be designed so that the transfer surface and / or at least one control surface, and / or the contact surface are at least partially formed as flat surfaces with a constant pitch or with a constant inclination angle relative to the respective adjustment direction, whereby the adjustable elements easy to finished are.

However, it may also be advantageous if the transfer surface and / or at least one control surface, and / or the contact surface is at least partially formed as convexly curved surfaces with variable pitch relative to the respective adjustment direction, whereby, for example, despite increasing counterforce of the return spring is a substantially constant Actuating force is effected. For this purpose, the transmission ratio decreases starting from the basic position during movement in the actuating position.

Favorable translation and force relationships between the adjustable elements of the safety device are given when the control surfaces on the coupling element in their effective portion in an inclination angle between 35 ° and 60 ° inclined to the adjustment direction of the coupling element.

The counterforce or bias of the return spring can be made relatively small when the cooperating with the contact surface on the locking element control surface of the

Coupling element in an inclination angle between 50 ° and 60 °, in particular by 55 ° with respect to its adjustment direction, whereby the return movement of the locking element is opposed in the locking position of the coupling element of lesser resistance.

If two transmission sub-surfaces on the actuating element or the transfer surfaces on two actuating elements and the control sub-surfaces on the coupling element and / or the contact part surfaces on the locking element cooperating control sub-surfaces are arranged symmetrically to the respective basic position of the considered upstream element results independent of the adjustment of the upstream element from the basic position always the same adjustment direction of the downstream element.

The contacting between the actuating element and the coupling element and / or between the coupling element and the locking element may further comprise a slotted guide, which is oriented differently to the adjustment directions of the respectively associated elements. The respective other element is coupled for example with a guide pin in the slotted guide.

In order to reduce the required actuating forces and wear due to reduced friction between the surfaces interacting during the movement transmission, it is advantageous for the transmission surface and / or the control surfaces and / or the contact surface to be provided with a friction-inhibiting layer.

The same advantageous effects can also be achieved in that the transmission surface and / or at least one of the control surfaces and / or the contact surface are formed by a rolling element mounted on the actuating element or on the coupling element or on the locking element. An alternative possibility of transferring the movement of the actuating element in a space-saving and yet reliable manner to the locking element consists in using as coupling means a substantially incompressible coupling fluid, which is enclosed in a fluid channel extending from the actuating elements to the locking element in the tool body, and further the transfer surfaces on the actuators and the

Contact surface on the locking element of sealed in the tool body guided piston sections are formed. The motion is transmitted by moving fluid volume between the actuating element and the locking element, wherein the fluid channel forms the guide for the coupling means displaceable therein in the form of the fluid, which contacts both the transmission surface on the two actuating elements and the contact surface on the locking element. The fluid channel connects, preferably in a straight line, the actuator directly to the locking element.

So that any leakage occurring on the locking element or the actuating elements can be compensated for in the use of the bending tool, it is possible for the fluid channel to be connected to a fluid reservoir via a valve arrangement, in particular a check valve.

In this case, the fluid reservoir can comprise a pressure-holding piston acted upon by a spring element, which feeds a quantity of coupling fluid corresponding to the leakage losses via the valve arrangement.

So that the securing of the bending tool in the tool holder takes place reliably in all states, it is advantageous if, in particular, the locking element is connected directly or indirectly with a return spring acting in the direction of the locking position. Furthermore, a return spring acting directly or indirectly on the actuating element and / or the coupling element is advantageous, so that these too are automatically moved in the direction of the basic position in the absence of an actuating force on the actuating element. A simple production of the bending tool is given when actuation element and / or coupling means and / or locking element are guided in circular cylindrical holes in the tool body and essentially a circular cylindrical body exhibit. In this case, the adjustable elements can be milled out of round material and accurately guided in the holes.

A change of a bending tool can be done with a gripping means of a handling device, if at least one actuating surface is accessible in a gripping recess on the tool body. As a result of the coupling of the handling device, the locking element is deactivated at the same time and no additional actuators are required for the unlocking.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Each shows in a highly schematically simplified representation:

Fig. 1 is an overall view of a possible embodiment of an inventive

Bending tool;

2 shows a partial section through an embodiment of a bending tool in the locking position.

3 shows a partial section through a further embodiment of a bending tool in FIG

Lock s position;

4 shows a partial section through a further embodiment of a bending tool in FIG

Lock s position;

5 shows a partial section through an embodiment of a bending tool with hydraulic movement transmission in the locking position.

6 shows a partial section through a bending tool according to FIG. 5 in the unlocked position; FIG.

7 shows a partial section through a further embodiment of a bending tool with hydraulic movement transmission in the locking position; 8 shows a contact point between a control surface on an actuating element and a coupling element with a friction-inhibiting layer; 9 shows a contact point between a control surface on an actuating element and a coupling element with a friction-inhibiting rolling element.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component designations, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position. Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

All statements on ranges of values in the description of the subject should be understood to include any and all sub-ranges thereof, e.g. the indication 1 to 10 should be understood to include all sub-ranges, starting from the lower limit 1 and the upper limit 10, i. all subregions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1 or 5.5 to 10.

Fig. 1 shows a view of a bending tool 1 for use on a bending machine, not shown, for which purpose this can be used in a mostly groove-shaped tool holder of a bending machine. The bending tool 1 is formed in the illustrated embodiment by a bending punch 2 with a short bending edge length, as it is often used on press brakes. However, the invention also extends to other embodiments of a bending tool, such as bending dies, bending dies, etc. The bending tool 1 comprises a Tool body 3 of which a base portion 4 is provided for insertion into a tool holder. The fixation of the bending tool 1 in the tool holder can be done by different fixing means, for example, based on non-positive or positive action. In the illustrated embodiment, a clamping groove 5 is formed on the base portion 4, in which a clamping jaws of the tool holder can engage positively. To prevent it falling out of the tool holder, the bending tool 1 comprises a locking element 6 that is adjustably arranged in a locking position with respect to the tool body 3, can positively engage the outwardly projecting portion in a recess in the tool holder, and thereby causes a positive locking of the bending tool 1 in the tool holder. A bending tool 1 can thereby be held in deactivation of the above-mentioned fixing means of the tool holder in the inserted position, without danger that it falls by its own weight from the tool holder.

The locking element 6 can be adjusted by means of an actuating element 7 from the illustrated locking position in which it protrudes outwardly relative to the tool body 3, in an unlocking position located within the tool body 3, wherein the actuating element 7 outside the tool holder on the tool body 3 and thus outside of the base portion 4 is accessible. The actuating element 7 has an actuating surface 8 and is adjustable from a basic position corresponding to the locking position of the locking element 6 into an actuating position corresponding to the unlocking position of the locking element 6. The actuating surface 8 is accessible in the illustrated embodiment of a side surface 9 on the tool body 3, on which also the locking element 6 is effective. On a second side surface 10, which is opposite to the first side surface 9, a further actuating surface 11 is accessible, which is formed either by the actuating element 7 or, as shown in Fig. 1, of its own further actuator 12. As with the bending tools known from the prior art and a bending tool according to the invention 1 with a locking element 6 that it does not need to be pushed laterally in the commonly used tool holders, but after releasing the tool clamping and unlocking of the locking element 6 by means of Betä- tigungselements 7 or by means of the further actuating element 12 in the working direction of the bending tool 1 can be removed from the tool holder.

The coupling according to the invention between actuating element 7 and locking element 6 or between the actuating elements 7, 12 and the locking element 6 is shown in FIGS. 2 to 8 in various possible embodiments.

Fig. 2 shows a partial section through a possible embodiment of a bending tool 1, which is inserted in a tool recess 13 of an adjustable or fixed press beam 14. Fig. 2 shows that the locking element 6 is in a locking position 15 in which a Verriegelungsforts atz 16 on the locking element 6 positively engages in a recess 17 within the tool holder 13, whereby the bending tool 1 is not in the direction of arrow 18 from the tool holder 13th can be removed or can not fall out of it due to its own weight. With the locking element 6 in the locking position 15, the bending tool 1 can only be displaced in the longitudinal direction of the groove-shaped tool holder 13 and, for example, be threaded laterally at the ends of the pressing beam 14. Since this is a time-consuming measure, especially in the case of composite tool sets, the locking element 6, as already described with reference to FIG. 1, can be displaced in dash-dotted direction 19, which extends transversely to the direction of arrow 18 of the tool holder, into an unlocking position 20 indicated by dashed lines adjust, in which the locking element 6 lies entirely in the tool body 3 and the locking projection 16 with respect to the outer surface, for example, the side surface 9, does not protrude. In the illustrated embodiment, the adjustment direction 19 of the locking element 6 extends at right angles transversely to the vertical inner side of the tool holder 13 and the locking element 6 is guided in corresponding guide surfaces in the tool base 3. The adjustability of the locking element 6 and also of the actuating element 7 is preferably provided in the rectilinear direction, but it is also an adjustability in the form of a pivoting movement possible. The locking element 6 is coupled to the actuating element 7 by means of a coupling means 21 in the form of a coupling element 19 which extends in the tool body 3 from the actuating element 7 to the locking element 6. The coupling element 22 is mounted rectilinearly adjustable in the tool body 3, including in the tool body 3 a recess is provided with corresponding guide surfaces. The adjustment direction 23 of the coupling element 22 extends transversely to the adjustment direction 19 of the locking element 6, in the illustrated embodiment, at right angles thereto. The coupling element 22 serves to mutually transmit adjusting movements of the actuating element 7 and of the locking element 6, and a defined adjustment position of the locking element 6 can be assigned to a defined adjusting position of the actuating element 7. The lock s position 15 of the locking element 6 shown in FIG. 2 accordingly corresponds to a basic position 24 of the coupling element 22 shown in full lines and a basic position 25 of the actuating element 7 likewise shown in full lines or corresponds to the unlocking position 20 of the locking element indicated by dashed lines 6 with an actuating position 26 of the coupling element 22 and also indicated by dashed lines actuating position 27 of the actuating element 7. The actuator 7 is adjustable in the tool body 3 along an adjustment 28 which is transverse to the adjustment 23 of the coupling element 22, and in particular oriented at right angles thereto is.

The unique, mutual association of the positions of actuating element 7 and locking element 6 takes place in that the coupling element 22 with a first control surface 29 contacted a transfer surface 30 on the actuating element 7 and a second control surface 31 of the coupling element 22 contacts a contact surface 32 on the locking element 6. The transfer surface 30 is in the illustrated embodiment by an approximately V-shaped

Recess formed in the actuating element 7, in which an approximately wedge-shaped end portion of the coupling element 22 engages, which forms the first control surface 29.

As shown in FIG. 2, the locking element 6 is connected to a return spring 33, which presses with a biasing force on the locking element 6 in the direction of the locking position 15.

If the locking extension 16 is not blocked by a stationary obstacle, for example the tool holder 13 next to the recess 17, this restoring force is transmitted via the contact surface 32 and the second control surface 31 to the coupling element 22, and from there in succession via its first control surface 29 transferred to the transfer surface 30 of the actuating element 7. If the locking element 6 or the actuating element 7 is not blocked by a corresponding opposing force, the locking element 6 is displaced into the locking position 15, the coupling element 22 is moved into the basic position 24 and subsequently the actuating element 7 into the basic position 25 according to FIG. For unlocking the locking element 6, as shown in Fig. 2, on the actuating surface 8 of the actuating element 7, an actuating force 34 exerted and the displacement of the actuating element 7 from the basic position 25 in the dashed operating position 27 via the transfer surface 30 and the first control surface 29 in an adjustment of the

Coupling element 22 and subsequently converted over the second control surface 31 and the contact surface 32 in an adjusting movement of the locking element 6, whereby this is spent in the dashed unlocking position 20. The coupling of the elements 7, 22 and 6 is based on the transmission of compressive forces between pressure surfaces in each case two bodies, wherein the pressure surfaces are inclined to the predetermined adjustment of the body, as is the case with the principle of the inclined plane or the principle of a wedge.

The actuating element 7 is accessible not only from the first side surface 9 of the tool body 3, but also accessible from the second opposing side surface 10, and the actuating element 7 also has a second actuating surface 11 opposite the actuating surface 8.

As a result of a symmetrical shape of the transfer surface 30 and the first control surface 29 with respect to the adjustment direction 23 of the coupling element, analogous conditions result for the actuation element 7 when the actuation force acts on the second actuation surface 11 - in FIG. 2 from the left - and becomes the locking element 6 also moved to the unlocked position 20.

The basic position of the actuating element 7, in which the actuating element is centered in the tool body 3, is predetermined in this embodiment by the lower end position, which corresponds to the basic position 24 of the coupling element 22, in which it from the locking element 6, with the return spring 33rd is pressed is pressed.

The actuation force 34 can be exerted by an operator or a robot, for example, and after unlocking the locking element 6, the bending tool 1 can be removed from the tool receptacle 13. In the embodiment of FIG. 2, the transfer surface 30, the two control surfaces 29 and 31 and the contact surface 32 by formed flat surfaces, but it is also an at least partially convex design of these surfaces possible, as shown by a further embodiment.

In the embodiment according to FIG. 2, the first control surface 29 of the coupling element 22 is oriented at an angle of inclination 35 of approximately 45 ° to the adjustment direction 23 of the coupling element 22. The transfer surface 30 on the actuating element 7 has the same inclination and it is translated by this inclination angle 35 of about 45 ° horizontal adjustment of the actuating element 7 in a vertical adjustment of the coupling element 22 to the same extent. However, the angle of inclination 35 may be other than in a range between 35 ° and 60 °, this choice of the inclination angle 35 is a sufficient distance to effective at the cooperating surfaces friction angles and thereby an occurrence of self-locking in the motion transmission between the elements is prevented , The second control surface 31 of the coupling element 22 is inclined in the embodiment of FIG. 2 at an inclination angle 35 of about 55 ° relative to the adjustment direction 23 of the coupling element 22, whereby an upward movement of the coupling element 22 in a magnitude greater horizontal movement of the locking element 6 in the direction of Unlocked position 20 is translated. During the movement of the locking element 6 from the unlocking position 20 into the locking position 15, this larger angle of inclination 35 causes the return movement of the return spring 33 to be accomplished more easily.

In a preferred embodiment of the bending tool 1, as shown in the example of FIG. 2, the actuating element 7, the coupling element 22 and the locking element 6 are guided in circular cylindrical bores 36 in the tool body 3 and have substantially a circular cylindrical base body, whereby such a bending tool 1 can be produced with relatively little effort and a low-backlash guidance of the elements can be easily achieved.

FIGS. 4 to 6 show further and optionally independent embodiments of the bending tool 1, wherein the same reference numerals or component designations are used for the same parts as in the preceding FIGS. 1 to 3. To unnecessary To avoid repetition, reference is made to the detailed description in the preceding Figs. 1 to 3 or taken in connection with components not described in detail below. In the embodiment shown in Fig. 2, the actuating element 7 passes through the

Tool body 3 completely and has a length 37 which is greater than a thickness 38 of the tool body 3 measured in the region of the actuating element 7. In the basic position 25 of the actuating element 7 projects this in Fig. 2 on both sides relative to the tool body 3 to the outside, However, could also be completely within the tool body 3, as long as the two actuating surfaces 8 and 11 are accessible through openings from the outside and the operation, for example takes place by means of a pin-shaped actuator.

FIGS. 3 to 8 show further and optionally independent embodiments of the bending tool 1, wherein the same reference numerals or component part designations are used for the same parts as in the preceding FIGS. 1 and 2. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding FIGS. 1 and 2 for components not described in detail below. 3 shows a partial section through a bending tool 1 with a further possible embodiment of a safety device 35, comprising actuating element 7, coupling means 21 in the form of a coupling element 22 and locking element 6, as already described with reference to FIGS. Also in this embodiment of the actuating element 7, a release of the locking element 6 can be made from both sides of the tool body 3, for which purpose a similar design of the Ubertragungsfläche 30 is provided in the actuating element 7, which will be described in more detail. In this embodiment, the transfer surface 30 comprises two transfer sub-surfaces 40 and 41, which are oriented differently with respect to one another and co-operate on the first control surface 29 of the coupling element 22 with two control sub-surfaces 42 and 43 oriented differently. The cooperating with the actuator 7 end of the coupling element 22 has approximately the shape of a blunt wedge, wherein the two control sub-surfaces 42 and 43 represent the wedge surfaces. In addition, the control part surfaces 42 and 43 have in Fig. 3 sections of convex faces, so they are spherical, while in the embodiment of FIG. 12, the control part surfaces are designed as flat surfaces. The transfer surface 30 with the two transfer faces 40, 41 is similar to a V-shaped groove into which the coupling element 22 engages the wedge-like end.

As a result of the fact that the coupling element 22 assumes its lowest point in the locking position 15 of the locking element 6, the actuating element 7 is thereby centered in its basic position 25 and can be pushed to the left into the actuation position, but alternatively also to the right into a second position Operating position when an operating force is exerted on the second actuating surface 11 from the left side. Since the coupling element 22 is lifted when moving in both operating positions relative to its lower basic position 24, the locking element 6 is adjusted both when actuated on the first actuating surface 8 and when actuated on the second actuating surface 11 in the unlocked position 20. By this embodiment of the bending tool 1, an unlocking of both side surfaces 9, 10 ago possible. For an operator or handling device standing in front of a bending machine, therefore, the actuating element 7 of the bending tool 1 is easily accessible from the front, irrespective of its orientation.

The transmission sub-surfaces 40, 41 extend in Fig. 3 in the central region, ie at the beginning of the adjustment of the actuator 7 from the basic position 25 initially steeper and then flat increasingly, whereby the required actuation force, despite increasing counterforce of the return spring 34 does not increase too much.

Also shown in Fig. 3, an operation shown in Fig. 2 by means of a forceps gripper 44 at the end of a handling device is indicated, which can move the actuator 7 from the basic position 25 in the operating position with an end face 45 and thereby unlock the locking element 6.

In addition, the actuating element 7 in a gripping recess 46 on the tool body 3 is accessible. This gripping recess 46 has undercuts, in which spread extensions 47 on the gripper gripper 44 can engage. To remove such a bending unit tool 1 from the tool holder 13 of the forceps gripper 44 is inserted in the closed state in the gripping recess 46, wherein the locking element 6 is moved by means of the actuating element 7 and the coupling element 22 in the unlocked position 20. Subsequently, the forceps gripper 44 is opened so far that the Spreizfortsätze 47 engage in the undercuts of the gripping recess 46, whereby the bending tool 1 is connected to the pliers gripper 44. Subsequently, a not shown, engaging in the clamping groove 5 Werkzeugklemmung be disabled and the bending tool 1 are removed down from the tool holder 13. To carry out a manual tool change, the tool clamping in the clamping groove 5 is released in a first step, and only then deactivated by an operator, the control element 6 by means of the actuating element 7 and the bending tool 1 manually removed down. In the embodiments according to FIGS. 2 and 3, the displaceable elements 6, 7, 22 are guided in bores 36 in the tool body 3 and essentially have a circular-cylindrical main body. The bore 36 for the coupling element 22 is attached to the upper end surface 48 of the bending tool 1 and this is closed after introduction of the elements 6, 7, 22 by a plug 49. For introducing the elements, these may have lateral flattening, which allows an insertion into the holes in a twisted position, even if a further element partially protrudes into this. The stopper 49 may, as shown in Fig. 2 additionally at its lower end a guide pin 50 which engages in a guide groove 51 on the locking element 6, whereby a rotation for the locking element 6 is formed.

In the embodiment shown in FIG. 3, the return spring 30 does not act directly on the locking element 6 in the direction of the locking position 15, but indirectly via a restoring element 52 which extends with a restoring surface 53, which extends obliquely to the vertical adjustment direction of the restoring element 52 at the Top of the locking element 6 on an inclined surface 54 which extends obliquely to the adjustment direction 19 of the locking element 6, acts. If no pressure force acts on the actuation surfaces 8 and 11, the restoring element 52 produces the locking element 6, as a consequence the coupling element 22 and subsequently the actuation of the locking element 52. transmission element 7 in the locking position 15 and the respective basic position 24, 25 spent.

In FIG. 3, an alternative embodiment of a bending tool 1 is shown with dashed lines or dashed reference lines, in which not a continuous actuating element 7 is used for lifting the coupling element 22, but this by two separate actuating elements 55 and adjustable in the tool body 3 56 with disposed thereon transfer surfaces 57 and 58, which are oriented differently to each other replaced. In this embodiment, the actuating elements 55 and 56 are pressed by the coupling element 22 in the basic position, which is not self-centering in this case, but is limited by means of stop elements 59. This replacement of a single actuator 7 by two actuators 55, 56 is of course also in the embodiment of the bending tool 1 according to FIG. 2 possible. The actuator 7 may be composed of two parts for facilitated assembly of the bending tool 1, which are inserted after the introduction of the coupling element 22 and the locking element 6 of the two side surfaces 9, 10 in the bore 36 for the actuator 7 and then connected to each other. FIG. 4 illustrates a further possible embodiment of a bending tool 1 in partial section, with two further possibilities for the transmission of motion between the elements 6, 7, 22 forming the safety device 39 being embodied here. Also in this embodiment, the actuating element 7, starting from a central base position 24, in two different operating positions 27, which are opposite, be adjusted, and the actuating element 7 has two mutually differently oriented transmission surfaces 40 and 41, in this embodiment a guide pin 60 formed on the actuating element 7 are arranged, which engages in a link guide element 61 formed on the coupling element 22. Since the slotted guide 61 extends obliquely to the adjustment of the actuating element 7, causes an adjustment of the actuating element 7 with the guide pin 60, an adjustment of the coupling element 22 with the slotted guide 61. The inclination angle of the slotted guide 61 is in the illustrated embodiment 45 °, but can also be up to 10 ° deviate from it. Depending on whether the actuator 7 to the left in the first operating position or to the right It is thereby raised, starting from its basic position 24 either in a raised actuation position 26 or in a lowered actuated position 62. In order for the locking element 6 to be displaced from its locking position 15 into its unlocking position independently of the adjustment direction of the actuating element 7 or the coupling element 22, the second control surface 31 acting on the locking element 6 comprises two control sub-surfaces 63 and 64, 65 and 66 act on the locking element 6 during the adjustment movement of the coupling element 22 on two mutually differently oriented contact surfaces and which are designed in a simplified form as a guide pin 67 on the locking element 6. The movement transmission between coupling element 22 and locking element 6 shown in FIG. 4 accordingly functions on the same principle as the movement transmission between actuating element 7 and coupling element 22 in FIG. 2 or FIG. 3. FIGS. 5 and 6 show a further embodiment of FIG Bending tool 1 shown, in which in the safety device 39, the movement transmission between the actuators 55, 56 and the locking element 6 is made by means of a coupling means 21 in the form of an incompressible coupling fluid 68, such as a hydraulic oil in one of the actuators 55, 56 to the locking element 6 leading fluid channel 69 is included.

Both on the actuators 55, 56 and the locking element 6 while piston portions 70 are formed, which are sealed out in the tool body 3. The piston portions 70 form on the actuators 55, 56, the transfer surfaces 57, 58 and the locking element 6, the contact surface 32, wherein the coupling fluid 68 can be moved between them by the fluid passage 69 alternately.

In the illustrated embodiment, close the piston portions 70 on reduced diameter piston rod portions 71 to the sealing bushes 72 outwardly to the actuating surfaces 8, 11 and the locking extension 16 lead. On the locking element here also engages a return spring 33, which returns the locking element 6 in the locking position 15, and in consequence the coupling fluid 68 and the actuators 55, 56 in the normal position in the absence of an actuating force. In Fig. 5, the initial position with the locking element 6 in the locking position 15 is shown.

In FIG. 6, the actuation of the left-hand actuating element 55 is shown, whereby the coupling fluid 68 is pressed through the fluid channel 69 to the locking element 6 and acts on the contact surface 32, whereby the locking element 6 counteracts the return spring 33 into the unlocking position 20 is transferred.

The actuation can also be done manually as described above or by a handling device, e.g. take a pliers gripper.

If none of the actuators 55, 56 pressed, the bending tool 1 can still be used in the tool holder 15, since in this case, the locking element 6 can be pressed against the force of the return spring 33, wherein the piston portion 70 sucks coupling fluid 68 through the fluid channel 69 and at least one of the actuating elements 55, 56 is retracted due to the negative pressure. Once the locking element 6 can be pressed by the return spring 33 back into the locking position 15, and the retracted actuating element 55, 56 is pressed back into the starting position.

In order to compensate for any leakage of coupling fluid 68 which may occur, a fluid reservoir 73 may be provided in which a supply of coupling fluid 68 is contained, and from which a small amount of coupling fluid may be introduced into the valve via a valve arrangement, in particular in the form of a check valve 74 Fluid channel 69 is introduced.

The fluid reservoir 73 is preferably provided with a pressure-holding piston 75, which is acted upon by a spring element 76 and generates a slight overpressure in the fluid reservoir 73.

FIG. 7 shows a further variant of a bending tool 1 with motion transmission by means of a coupling fluid 68, which largely correspond to the embodiment described with reference to FIGS. 5 and 6.

In this embodiment, the piston section 70 of the locking element 6 is displaceably mounted on its piston rod section 71 and the end of the piston section 70 is displaced by the piston section 70. led piston rod portion 71 provided with a collar 77. In an adjustment of an actuating element 55, 56 from the illustrated basic position, the locking element 6 is pressed as shown in Fig. 5 by the coupling fluid 68 in the unlocking s position 20. If none of the actuators 55, 56 pressed, the bending tool 1 can still be used in the tool holder 15, since in this case the locking element 6 can be pressed against the force of the return spring 33, wherein the displaceable piston portion 70 remains in the starting position. To compensate for leakage, a fluid reservoir 73, as described with reference to FIGS. 5 and 6 may also be provided in this embodiment.

8 shows a possible contact point between an actuating element 7, 55, 56 and a coupling element 22 or between a coupling element 22 and a belt element 6, in which, in order to reduce frictional forces during the transmission of motion, at least one of the contact surfaces has a friction-inhibiting layer 78, e.g. made of PTFE or a lubricant such as e.g. Graphite is provided.

Alternatively or additionally, as shown in FIG. 9, a contact point between an actuating element 7, 55, 56 and a coupling element 22 or between a coupling element 22 and a locking element 6 for reducing frictional forces in the motion transmission, a transmission surface 30 or the transmission steep surfaces 40, 41 or the control surfaces 29, 31 or the control part surfaces 42, 43, 63, 64 or the contact surface 32 or contact part surfaces 65, 66 forming rolling elements 79, for example a rolling bearing ring be provided.

The embodiments show possible embodiments of the bending tool 1, wherein it should be noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but rather also various combinations of the individual embodiments are possible with each other and this variation possibility due to the teaching of technical action representational invention in the skill of those skilled in this technical field. It can therefore also all conceivable variants, which by combinations of individual details of illustrated and described embodiment are possible, will be the subject of further claims.

For the sake of order, it should finally be pointed out that, for a better understanding of the construction of the bending tool 1, this or its components have been shown partially unevenly and / or enlarged and / or reduced in size.

The task underlying the independent inventive solutions can be taken from the description.

Above all, the individual in Figs. 1; 2; 3; 4; 5, 6; 7; 8th; 9 embodiments form the subject of independent solutions according to the invention. The relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures.

S u b e c u s e c tio n a tio n s

Bending tool 36 bore

Bending punch 37 length

Tool body 38 thickness

Base section 39 Safety device

Clamping groove 40 transmission surface

Lock element 41 transmission part surface

Actuator 42 control section surface

B etätigungs surface 43 Steuerbfläche

Side surface 44 Pliers gripper

Side surface 45 end surface

Actuating surface 46 gripping recess

Actuator 47 Spreading extension

Tool recess 48 end surface

Pressing bar 49 plug

Locking s Position 50 Guide pin

Locking extension 51 Guide groove

Recess 52 return element

Arrow 53 Reset area

Adjustment direction 54 inclined surface

Release s Position 55 Actuator

Coupling means 56 actuator

Coupling element 57 transmission surface

Adjustment direction 58 Transmission surface

Basic position 59 stop element

Basic position 60 guide pins

Actuating position 61 Slotted link guide

Actuating position 62 actuating position

Adjusting direction 63 control part surface first control surface 64 control part surface

Transfer surface 65 contact part surface second control surface 66 contact part surface

Contact surface 67 guide pin

Return spring 68 Coupling fluid

Operating force 69 fluid channel

Tilt angle 70 piston section 71 piston rod section

72 sealing bush

73 fluid reservoir

74 check valve

75 pressure retaining piston

76 spring

77 fret

78 shift

79 rolling elements

Claims

Patent claims

1. bending tool (1) for insertion into a tool holder (13), comprising a tool body (3), an adjustable therein locking element (6) for securing the bending tool (1) in the tool holder (13) by engaging in a disposed therein Recess (17), two of opposite side surfaces (9, 10) on the tool body (3) outside the tool holder (13) accessible actuating surfaces (8, 11), which are arranged on at least one actuating element (7), which between one with the locking position (15) of the locking element (6) corresponding to the basic position (25) and one with the unlocked position (20) of the locking element (6) corresponding actuating position (27) is adjustable, and wherein an adjustment of the actuating element (7) in the direction of the actuating position (27) by means of a coupling means (21) in a movement of the locking element (6) in the direction of unlocking s position (20) is transmitted, characterized in that the coupling means (21) extends from the actuating element (7) to the belt element (6) and contacts a transmission surface (30) on the actuating element (7) and a contact surface (32) on the latch element (6), and in that the coupling device (21) between the actuating element (7) and locking element (6) substantially in the spacing direction between the actuating element (7) and locking element (6) displaceable in the tool body (3) is guided.

2. bending tool (1) according to claim 1, characterized in that the actuating surfaces (8, 11) of two in the tool body (3) mounted and on the coupling means (21) acting actuators (55, 56) are formed.

3. bending tool (1) according to claim 1 or 2, characterized in that the

Coupling means (21) by a with a first control surface (29) contacting the transfer surface (30) and with a second control surface (31) the contact surface (32) contacting the coupling element (22) is formed.

4. bending tool (1) according to claim 3, characterized in that the actuating element (7) from the basic position (25) in two oppositely oriented to this actuating positions (27) is adjustable and the transfer surface (30) two different Lich oriented transmission steep surfaces (40, 41) which cooperate with two differently oriented control sub-surfaces (42, 43) on the coupling element (22).

5. bending tool (1) according to claim 3, characterized in that the coupling element (22) from its with the locking position (15) of the locking element (6) corresponding to the basic position (24) in two opposite to this actuation positions oriented (26 ) is adjustable and the second control surface (31) comprises two mutually differently oriented control part surfaces (63, 64) which cooperate with two mutually differently oriented contact part surfaces (65, 66) on the locking element (6).

6. bending tool (1) according to one of claims 3 to 5, characterized in that the adjustment directions (19, 23, 28) of actuating element (7), coupling element (22) and locking element (6) lie in a common plane.

7. bending tool (1) according to one of claims 3 to 6, characterized in that the transfer surface (30) and / or at least one control surface (29, 31) and / or the contact surface (32) at least partially as a flat surface with a constant pitch is formed based on the respective adjustment direction (28, 23, 19).

8. bending tool (1) according to one of claims 3 to 7, characterized in that the transfer surface (30) and / or at least one control surface (29, 31) and / or the contact surface (32) at least partially as a convexly curved surface with variable Slope based on the respective adjustment direction (28, 23, 19) is formed.

9. bending tool (1) according to one of claims 3 to 8, characterized in that the control surfaces (29, 31) on the coupling element (22) in its effective portion at an inclination angle (35) between 35 ° and 60 ° inclined to the adjustment ( 23) of the coupling element (22).

10. Bending tool (1) according to one of claims 3 to 9, characterized in that the contact surface (32) on the locking element (6) cooperating control surface (31) of the coupling element (22) in an inclination angle (35) between 50 ° and 60 °, in particular by 55 ° with respect to its adjustment direction (23).

11. Bending tool (1) according to one of claims 3 to 10, characterized in that transmission part surfaces (40, 41) on the actuating element (7) or transfer surfaces (30, 40, 41) on two actuating elements (55, 56) and control sub-surfaces (42 , 43) on the coupling element (22) and / or contact part surfaces (65, 66) on the locking element (6) cooperating control part surfaces (63, 64) symmetrical to the respective basic position (24, 25) and locking position (15) of the considered element are arranged.

12. bending tool (1) according to one of claims 3 to 11, characterized in that the contact between the actuating element (7) and coupling element (22) and / or between the coupling element (22) and locking element (6) comprises a slotted guide (61), which is oriented inclined to the adjustment directions of the respectively associated elements (7, 22, 6).

13. bending tool (1) according to one of claims 3 to 12, characterized in that the transfer surface (30) and / or the control surfaces (29, 31) and / or the contact surface (32) with a friction-inhibiting layer (78) are provided.

14. bending tool (1) according to one of claims 3 to 12, characterized in that the transfer surface (30) and / or at least one of the control surfaces (29, 31) and / or the contact surface (32) of a on the actuating element (9) or on the coupling element (22) or on the locking element (6) mounted rolling elements (79) are formed.

15. Bending tool (1) according to claim 2, characterized in that the coupling means (21) is formed by a substantially incompressible coupling fluid (68) in a tool body (3) of the actuating elements (55, 56) for Locking element (6) extending fluid channel (69) is included, and that the transfer surfaces (57, 58) on the actuating elements (55, 56) and the contact surface (32) on the locking element (6) of sealed in the tool body (3) guided piston sections ( 70) are formed.

16. bending tool (1) according to claim 15, characterized in that the fluid channel (69) via a valve arrangement, in particular a check valve (74) with a fluid idreservoir (73) is connected.

17. Bending tool (1) according to claim 15 or 16, characterized in that the fluid reservoir (73) comprises a spring element (76) acted upon pressure holding piston (75).

18. Bending tool (1) according to one of the preceding claims, characterized in that the actuating element (7) and / or the actuating elements (55, 56) and / or the coupling element (22) and / or the locking element (6) with an in Direction of the basic position (25, 24) or locking position (15) acting return spring (33) is connected.

19. Bending tool (1) according to one of the preceding claims, characterized in that the coupling means (21) is guided in circular cylindrical bores (36) in the tool body (3) or is contained.

20. Bending tool (1) according to any one of the preceding claims, characterized in that the actuating surfaces (8, 11) within on opposite side surfaces (9, 10) on the tool body (3) formed gripping recesses (46) on the tool body (3) are accessible ,