WO2007144072A1

WO2007144072A1 - Clamping device

Info

Publication number: WO2007144072A1
Application number: PCT/EP2007/004806
Authority: WO
Inventors: Hans-Michael Weller
Original assignee: Hainbuch Gmbh Spannende Technik
Priority date: 2006-06-12
Filing date: 2007-05-31
Publication date: 2007-12-21
Also published as: EP2032311A1; DE102006028060A1; CA2655032A1

Abstract

A vice (11) has two clamping jaws (15) for clamping workpieces. Between the clamping jaws (15), there is a tensioning device (18) for multi-part chuck heads that operates in a downward direction. Both the clamping jaws (15) and the tensioning device (18) are simultaneously activated by means of a single activation device (21, 30, 31, 37), wherein the activation device has two levers (21). On the one hand, these levers are pressed apart at one end, while on the other hand, they have a projection (24) that engages with a coupling pipe (25) for synchronized movement. The coupling pipe (25) is used to activate the tensioning device (18).

Description

Description of clamping device

Field of application and state of the art

The invention relates to a clamping device in the manner of a vise, wherein two clamping jaws are guided with a guide on a base body and can be moved toward each other for clamping a workpiece. Such clamping devices are widely known to the skilled person. However, they are usually only suitable for clamping flat workpieces or workpieces with plane-parallel sides. For non-prismatic workpieces such as pipes special clamping jaws must be used.

Task and solution

The invention has for its object to provide a clamping device mentioned above with extended functionality, preferably for clamping previously difficult to handle workpieces, which are in particular non-prismatic.

This object is achieved by a clamping device with the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference.

According to the invention, provision is made for a clamping means for clamping heads or collets to be provided on the base body in addition to the clamping jaws, this clamping means having an axial actuating direction into the base body. Of course, the operating direction of the clamping means can also be exactly opposite, that is, just out of the main body. The advantage of such additional clamping means is that the body can be used multiple times. In particular, it is thereby also possible to attach the clamping device or the vise to a machine tool, for example a drill. Depending on the workpiece to be clamped, the clamping function can be used with the clamping jaws or else a clamping head similar to DE 101 38 330 A1 or a collet similar to DE 203 20 084 U1, in particular if tubes or similar round materials are to be machined. So it does not need to be replaced the entire vise or the entire clamping device. This is a great advantage with increasing the processing speed and ease of work.

Advantageously, in the clamping device, the clamping jaws are moved uniformly from both sides to a point between them. In particular, this is a movement on the clamping means too. For this purpose, the clamping means may be provided between the clamping jaws. It is possible that the direction of access or direction of attachment of a workpiece to be clamped to the clamping means is the same as that of the clamping jaws.

In an advantageous embodiment of the invention, a single actuator is provided, with which the clamping jaws are moved or with which the clamping operation is performed. Thus, the clamping device can be operated easily and quickly. The actuator may be manually operable, for example, as a screw, lever or the like .. Furthermore, it can be operated hydraulically or pneumatically, but this does not matter in the invention.

In a particularly advantageous embodiment of the invention, the clamping jaws and the other clamping means on the main body on the same drive or the same control. This is in particular the aforementioned single actuator. Above all, this drive or this actuator is designed so that both the Clamping jaws and the other clamping means are operated simultaneously regardless of which of the two are used. It can also be provided that the clamping jaws can be removed from the body or, as is common for such vices, run on a carriage in a guide and can be attached to the carriage in different positions for different widths. The advantage of such a single actuator is that the cost of the mechanical structure of the clamping device is significantly reduced. Furthermore, such an operation is very simple.

Said actuating means may comprise a lever mechanism with actuating devices, in particular levers, for the clamping jaws and the clamping means. Such a lever mechanism allows a very good and efficient power transmission. It can be provided for each jaw its own actuator. These actuators in turn are interconnected or positively coupled for simultaneous movement. This forced coupling is advantageously carried out via a coupling part. This, so to speak, ensures the mechanical synchronization of the movement of the levers, which ensures a uniform tension, especially when the two jaws are moved equal to a point between them.

In a further advantageous embodiment of the invention, this coupling part may additionally be part of the clamping means. So it can perform a dual function. In particular, it can activate or actuate the clamping device. For this purpose, it may be, for example, a kind of draft tube for a multi-part clamping head of the aforementioned type, which cooperates with the clamping means or is used in this for clamping workpieces. In this way, the above-described idea can be realized that a total of a single actuator for the entire clamping device can be provided can, both on the one hand, the jaws and on the other hand, the clamping means.

The actuating device can advantageously be designed so that the coupling part moves toward one another downwards into the base body during a movement of the clamping jaws. This is then at the same time the clamping direction of the clamping means, so for example, a pulling and tight clamping a clamping head in the clamping means.

In detail, the two actuators of the clamping jaws can engage the outside of the coupling part, on opposite sides. This is particularly advantageous in the case of a tubular or tubular coupling part. For this purpose, the actuators can a projection or the like. have, which engages in corresponding recesses or grooves on the outside of the coupling part. This attack or engagement is form-fitting along the direction of movement of the coupling part, ie in particular in both directions. Thus, a movement of the actuators and the coupling part is always specified exactly.

The actuators may have lever arms or be designed as such. The lever arms may be connected at one end to the actuating device, in particular via intermediate parts such as levers or linkage. At a first other end, they are each connected to a jaw or guide carriage for a jaw. At a second other end they are connected to the clamping means or an aforementioned coupling part of the clamping means, in particular in the manner described above by positive engagement. A bearing point of these lever arms is advantageously located between the connection with the actuating device on the one hand and the connection with the clamping jaws on the other. For example, this results in a kind of 1: 1 force transmission, wel ensures a good relationship between the force to be applied and the tension travel that has been restored at the same time.

The clamping device may have a push rod, via which the actuating device actuates the two actuating devices. For this purpose, the actuator is connected to the push rod. Such a connection can for example be designed so that a screw or a threaded rod is mounted non-rotatably on the nearest actuating device or is attached. This screw engages in a rotatable nut, which is mounted on the push rod and can be rotated from the outside, for example via a lever or a tool. When turning the nut from the outside, ie upon actuation of the clamping device, nut and screw are pulled together while the actuators are moved towards each other via the push rod, in particular in the area in which they are connected via nut and screw.

The aforementioned push linkage extends in a plane within the base body, through which the tensioning means runs or which pierces the tensioning means. In this case, the push rod advantageously has a large free central area and extends on both sides close to the outer edge of the body, ie around the clamping means. This can be achieved in that the push rod has two outer push rods, which are connected to each other via a relatively wide connection axis, wherein at least one of the connecting axis one of the actuators is mounted and on the other connecting axis of the aforementioned mother. In this way, a very compact design of the clamping device can be created, so to speak, the actuation of the actuating device, which faces away from the actuating side, takes place through the clamping means or the region of the clamping means, thereby bypassing the clamping means. These and other features will become apparent from the claims and from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in one embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into intermediate headings and individual sections does not limit the general validity of the statements made thereunder.

Brief description of the drawings

An embodiment of the invention is shown schematically in the drawings and will be explained in more detail below. In the drawings shows:

1 shows an oblique view of a vise according to the invention as a clamping device,

A lateral section through the vice of Figure 1 illustrating the lever arms for actuation and

3 shows a section through the vise of Figure 1 in plan view to illustrate the push rod to the central additional clamping means over.

Detailed description of the embodiment

In Fig.1 a vice 11 is shown in an oblique view with an externally basically known structure. On a base body 12 runs in the upper region on each side of a clamping carriage 14, in particular with a corrugated upper side, not shown. On each of these clamping carriages 14, a clamping jaw 15 is screwed tightly, this screwing being such that the clamping jaws 15 can be fastened at any desired position on the clamping carriages 14 in order to adjust the width of the clamping carriages 15. te between the clamping surfaces 16 as adaptation to exciting workpieces. This is well known to those skilled in the art.

It can be seen how approximately in the middle of the top of the base body 12, ie between the jaws 15, an additional clamping means 18 is provided. It has an inner cone 19 for the use of clamping heads or clamping bushes, as they are mentioned above, for example. In this respect need not be further discussed here. The exact operation of the additional clamping means as well as that of the jaws will be explained in more detail below.

Inside the main body 12, two lever arms 21 are arranged, and rotatably mounted about Hebelarmachsen 22. The lever arms 21 are formed substantially mirror-inverted to a dash-dot vertical center plane of the vise 11. The lever arms 21 extend substantially in the vertical direction, wherein each extending approximately at the level of Hebelarmachsen 22, a projection 24 to the center plane. Its three sides are slightly rounded in order to better engage in grooves 26 in a coupling tube 25 located between them. This coupling tube 25 is located just below the additional clamping means 18 and the inner cone 19. It is used in particular to pull the aforementioned clamping heads or clamping bushes in the additional clamping means down to actuate the same or to carry out the clamping operation. In this case, the coupling tube 25 is mounted both in its upper region in a corresponding extension of the inner cone 19 and in its lower region so that it is always guided exactly vertically or is movable.

Up to grab the lever arms 21 with further projections 28 in a manner not shown in the jaws 15 a. This engagement may be similar to that with the projections 24 in the grooves 26, wherein corresponding recesses in the clamping jaws 15 and whose undersides are provided.

As can be seen in particular from Figure 3, the left connection axis 30 of the left lever arm 21 is mounted in two push rods 37 which extend at a great distance from each other close to the outer edge of the base body 12 in its longitudinal direction. On their right side, the push rods 37 are also connected via a connecting shaft 30. However, this is not stored in the right lever arm 21 or passes through it, but carries a threaded bushing 34 such that it can be rotated, for example, by attacking a tool on the hexagon socket 35 about the horizontal axis shown in phantom. It does not move relative to this along this axis of rotation because of their storage on the right connecting shaft 30. The two push rods 37 form with the connecting axes 30, the aforementioned push rod. It should also be noted that the two push rods 37 and the overall formed push rod has a large free central region 38. In this extends the extension of the clamping means 18, in particular the coupling tube 25. At a bolt 31 which is mounted in the lower region of the right lever arm 21 and parallel to the left connection axis 30, a kind of screw is mounted with a corresponding eye 32, rotatably in relation to the said axis of rotation of the threaded bushing 34th

function

To actuate both the jaws 15 and the clamping means 18, which usually only used alternatively, either the jaws 15 are brought to the clamping slide 14 in a desired starting position or it will be inserted into the clamping means 18, a clamping head or a clamping bush. Then with a corresponding tool on the Nensechskant 35 rotated about the dash-dotted axis of rotation, for example, in a normal thread in a clockwise direction. Since the threaded bush 34 is mounted on the push rods 37 via the right-hand connecting shaft 30 and the screw 32 is mounted on the right lever arm 21 via the bolt 31, the right-hand connecting shaft 30 and the bolt 31 are moved towards one another. This causes a tilting of the right lever arm 21 counterclockwise. As a result, both the clamping carriage 14 together with the clamping jaw 15 is moved to the left towards the center as well as via the projection 24 and the groove 26, the coupling tube 25 down. At the same time, the right-hand connection axis 30 is moved to the left and transmits this movement via the push rods 37 to the left connection axis 30, which causes the left lever arm 21 to pivot in the clockwise direction. This in turn results in a movement of the left clamping jaw 15 and a rectified to the right projection 24 movement of the left projection 24 down. While the distance between the clamping jaws 15 and clamping surfaces 16 would remain the same over the pure interaction between the left lever arm 21 and the right lever arm 21 via the push rods 37, they could still move together to the left or right. However, this is prevented by the coupling of the projections 24 of the lever arms 21 with each other via the coupling tube 25. This thus causes a kind of forced synchronization or equal motion. In this respect, the coupling tube 25 serves not only as an actuation for the additional clamping means 18, but also just for mandatory movement of the lever arms 21 and thus the entire clamping device 11. It can be provided that the main clamping force transmitted via the push rods 37 between the lever arms 21 is, and on the coupling tube 25 via the projections 24 only as much force is applied as is necessary to synchronize the movement. At the same time, this synchronization also means that the coupling tube 25 is simultaneously pulled down from both sides, which causes a very good tension on the tensioning means 18. For precise adjustment of the operation can be provided that the Hebelarmachsen 22 of the lever arms 21 can be easily offset in the body 12. This can be done, for example, that they are round in one area and eccentric in the other, so either in a storage on the base body 12 around and within the lever arm 21 eccentric or the other way round.

Of course, modifications of the above-described embodiment are possible. Thus, instead of actuation by means of the screw 32 together with the threaded bushing 34 mounted on the right-hand connection axis 30, an actuation can take place, for example, pneumatically or hydraulically. Furthermore, the shape of the lever arms 21 may vary or the tensioning means 18 may be arranged at another favorable point on the base body 12. However, an arrangement of the clamping means 18 between the lever arms 21 and thus actually between the clamping jaws 15 is considered to be particularly advantageous.

Thus, a main function of the coupling tube 25 is the operation on the clamping means 18. For this purpose, the coupling tube 25 is pressed by the projections 24 of the lever arms 21 down. Another main function is the synchronization of the movement of the lever arms 21 with each other. For this purpose, the coupling tube 25 is mounted tilt-safe. A particularly noteworthy advantage of the invention is that these two main functions are always performed simultaneously, whereby only when using the clamping means 18, the first main function is necessary.

Claims

claims

1. clamping device (11) in the manner of a vise with two mutually movable clamping jaws (15), wherein the clamping jaws run on a guide (14) on a base body (12), characterized in that on the base body (12) has a clamping means (18) is provided for clamping heads or collets with axial actuation direction into the base body (12).

2. Clamping device according to claim 1, characterized in that the clamping jaws (15) are each uniformly movable from both sides to a point between them during clamping, preferably on the clamping means (18).

3. Clamping device according to claim 1 or 2, characterized in that the clamping means (18) between the clamping jaws (15) is provided with the same access direction as for the voltage to the clamping jaws (15).

4. Clamping device according to one of the preceding claims, characterized in that a single actuating device (21, 30, 31, 37) for the movement of the clamping jaws (15) is provided.

5. Clamping device according to one of the preceding claims, characterized in that the clamping jaws (15) and the further clamping means (18) have the same drive or the same control for simultaneous operation, in particular by the actuating device (21, 30, 31, 37) Claim 4.

6. Clamping device according to one of the preceding claims, characterized in that the actuating device (21, 30, 31, 37) has a lever mechanism with actuators (21) for the clamping jaws (15) and the clamping means (18), wherein for each jaw ( 15) an actuating device (21) is provided and wherein the actuating devices (21) are positively coupled via a coupling part (25).

7. Clamping device according to claim 6, characterized in that the coupling part (25) is a part of the clamping means (18), in particular a kind of draw tube for a multi-part clamping head, which cooperates with the clamping means (18) for clamping workpieces.

8. Clamping device according to claim 6 or 7, characterized in that the coupling part (25) upon movement of the clamping jaws (15) towards each other down into the base body (12) is movable into and this is the clamping direction of the clamping means (18).

9. Clamping device according to one of claims 6 to 8, characterized in that the two actuating devices (21) of the clamping jaws (15) on opposite sides outside of the coupling part (25) engage, in particular each with a projection (24) in corresponding grooves ( 26) on the coupling part (25) engage, said attack is form-fitting along the direction of movement of the coupling part.

10. Clamping device according to one of the preceding claims, characterized in that the actuating devices comprise or are lever arms (21) which are connected at one end to the actuating device and at a first wide ren end (28) each having a clamping jaw (15) and at a second further end (24) with the clamping means (18) or a coupling part (25) of the clamping means according to claim 6.

11. Clamping device according to claim 10, characterized in that the lever arms (21) of the actuating devices have a bearing point (22) between the connection with the actuating device and the connection (28) with the clamping jaws (15).

12. Clamping device according to claim 10 or 11, characterized by a push rod (30, 31, 37), wherein the actuating device via the push rod (30, 31, 37), the two actuating devices (21) for moving the clamping jaws (15) actuated and thereto is connected to this, in particular a screw (32) on an actuating device (21) is mounted and in a rotatable nut (34) on the nearest thrust rod (30, 31, 37) engages and upon rotation of the nut (34) from the outside to actuate the nut (34) and the screw (32) are pulled together, being moved over the push rod (30, 31, 37), the actuators (21) and preferably also the tensioning means (18).

13. Clamping device according to claim 12, characterized in that the thrust rod (30, 31, 37) extends in a plane through which the tensioning means (18), wherein in particular the thrust rod (30, 31, 37) has a large free central area ( 38) and extends on both sides close to the outer edge of the base body (12).

14. Clamping device according to claim 13, characterized in that the clamping means (18) pierces the free central region (38).