Patent Application
20170197296
The invention relates to a holding apparatus for holding a workpiece to be machined, having a round and/or tubular cross-section, in such a manner that in the held state, the workpiece can be rotated relative to the holding apparatus.
Such a holding apparatus can be used, for example, as a constituent of a circular saw for pipes. The pipe to be machined is fixed in place in such a manner that a rotational movement of the pipe relative to the holding apparatus is permitted for machining. Cutting through the pipe is carried out in that a saw unit having a saw blade is pressed against the outer circumference of the pipe, and then the entire circular saw for pipes is moved around the pipe, wherein the saw unit remains in active contact with the pipe.
The holding apparatus usually has two clamping arms that are held on a base part so as to pivot, for gripping the pipe to be machined, which arms engage around at least part of the outside circumference of the pipe and exert a clamping force on the pipe. An adjustment mechanism is usually provided for moving the clamping arms in the direction toward the pipe.
An embodiment of the invention is based on the task of technically optimizing a holding apparatus having the characteristics stated initially. In particular, a holding apparatus having the characteristics stated initially is supposed to be made available, which apparatus allows fast release of the clamping arms out of clamping engagement on the workpiece to be machined. In particular, a holding apparatus having the characteristics mentioned initially is supposed to be made available, the adjustment mechanism of which apparatus has a compact construction with regard to the clamping arms, and requires relatively little space for performing possible clamping movements.
This task is accomplished with a holding apparatus that has the characteristics of claim 1. Furthermore, the task is accomplished with holding apparatus that has the characteristics of claim 3. Advantageous embodiments of the invention are evident from the dependent claims, the following description, and the figures.
A holding apparatus for holding a workpiece to be machined, the workpiece having a round and/or tubular cross-section, in such a manner that in the held state, the workpiece can be rotated relative to the holding apparatus, has at least two clamping arms mounted on a base part, by means of which arms a clamping force can be exerted on the workpiece. In particular, at least part of the outside circumference surface of the workpiece can be grasped by the clamping arms. In particular, the clamping force acts on the workpiece as a holding force.
The holding apparatus furthermore has an adjustment mechanism for the clamping arms, the mechanism having a threaded spindle that can be manually activated and/or activated by means of an auxiliary force, which spindle is releasably in threaded engagement with a threaded part, such as a spindle nut, for example, wherein the threaded part is held on a component of the holding apparatus, particularly on the base part, so as to be fixed in place or fixed on the housing with reference to the base part, in the axial direction of the threaded spindle. In particular, the threaded spindle and the threaded part are releasably in threaded engagement with one another in the radial direction with reference to the threaded spindle.
In this way, a spindle drive is implemented for activation of the adjustment mechanism, which drive allows quick adjustment of the threaded spindle relative to the threaded part, in the axial direction. For this purpose, the threaded spindle is releasably held in threaded engagement with the threaded part. This is because the function of the spindle drive, as a screw gear mechanism, is put out of force by release of the threaded part from the threaded engagement with the threaded spindle, and the threaded spindle can be freely moved relative to the threaded part, in the axial direction. In this respect, this measure allows overly rapid release of the clamping arms from the clamping engagement on the workpiece to be machined.
Supplementally or alternatively to this, the adjustment mechanism can have at least two drivers guided in straight manner, by means of the movements of which drivers the clamping arms can be pivoted or are pivoted toward one another, if applicable by way of at least one intermediate element, such as, for example, an intermediate brace. Viewed in the direction transverse to the movement direction of the drivers, the drivers are disposed to lie one behind the other.
In this way, the adjustment mechanism of the holding apparatus is implemented in technically simple manner. This is because adjustment of the clamping arms is brought about by means of a simple straight-line movement of the drivers. The drivers are preferably guided in a straight line by means of a corresponding guide, in order to guarantee that the drivers remain on their intended movement path.
Furthermore, the adjustment mechanism is configured to have a compact construction. This is because the expanse of the adjustment mechanism in the movement direction of the drivers is less, since the drivers lie one behind the other in the direction transverse to their movement direction, than if the drivers were to lie on a common line in the direction transverse to their movement direction. Also, the space requirement of the adjustment mechanism for performing the adjustment movement of the clamping arms is relatively slight. This is because in order to achieve a maximal adjustment, the drivers do not have to be pushed as far apart from one another than if the drivers were to lie on a common line in the direction transverse to their movement direction.
It can be provided that the drivers are mounted to be movable in the direction of the movement of the clamping arms, particularly that they are mounted to be essentially translationally movable. This measure also aims at configuring the adjustment mechanism so as to have a compact construction. This is because in this way, the drivers essentially move in the plane spanned by the movement of the clamping arms. For example, the drivers can be movable in such a manner that the movement of the drivers essentially takes place transverse to the axis of rotation of the clamping arms.
It is possible for the drivers, viewed transverse to their movement direction, to be arranged offset from one another. In this way, the drivers span a further distance in their movement direction, without the respective driver itself having a length over this distance. By means of the offset arrangement of the drivers, it is therefore possible, in simple manner and with a relatively small length expanse of the respective driver, to achieve a relatively great longitudinal expanse as a whole, by means of which coupling to the clamping arms, which are disposed at a distance from one another, is facilitated. This is because the distance between the coupling points of the respective clamping arm and driver is preferably dimensioned in such a manner that the workpiece can be accommodated between them.
Of course, the drivers can also be disposed so as to essentially align with one another, viewed transverse to their movement direction.
It is possible that the drivers overlap, viewed in their movement direction. In this way, the drivers can be movement-coupled with one another in technically simple manner, so that, for example, in the case of a movement of the one driver, movement of the other driver is also brought about at the same time. For example, the overlapping region can be utilized by a gear mechanism, in order to act both on the one driver and also on the other driver.
A possible embodiment of the invention consists in that the drivers are movement-coupled with one another by way of a reversal gear mechanism. In this way, it is guaranteed that the drivers can be moved both in the one direction and also in the other direction, in their movement guided in a straight line, and that one and the same gear mechanism, namely the reversal gear mechanism, is used for this purpose. By means of the reversal gear mechanism, it can be provided that the drivers can be moved toward one another and can also be moved away from one another.
According to a further embodiment of the invention, it is provided that the drivers each have gear-tooth systems, and, between them, a gear wheel that meshes with the gear-tooth systems, particularly a rotatable gear wheel, is provided. In particular, the gear wheel is held to be fixed in place or fixed on the housing with reference to the base part. In this way, movement coupling of the drivers with one another is implemented in technically simple manner.
Alternatively to the gear wheel, a friction wheel can also be provided, which is disposed between the drivers and stands in active contact with a counter-friction surface of one of the drivers, in each instance. In particular, the friction wheel is fixed in place or fixed on the housing, with reference to the base part.
It can be provided that the gear-tooth systems or counter-friction surfaces are disposed laterally on the drivers and that the axis of rotation of the gear wheel or friction wheel lies essentially transverse to the movement direction of the drivers. In this way, movement coupling of the drivers can be implemented in technically simple manner, by means of the gear wheel or friction wheel, if the drivers are disposed to lie one behind the other, viewed transverse to their movement direction, and lie in the region of the base part, so that the gear wheel or friction wheel can be mounted on the base part.
For example, it can be provided that at least one of the drivers has a gear rack or is configured as a gear rack. This measure is also aimed at implementing the movement coupling of the drivers in as technically simple a manner as possible.
According to a further embodiment of the invention, it is provided that the threaded spindle is connected to act with one of the drivers, in the axial direction, particularly that it engages on one of the drivers and/or is mounted on it, particularly mounted on it so as to rotate. In this way, transfer of the adjustment movement predetermined by the threaded spindle to the clamping arms is made possible in technically simple manner. For this purpose, all that is required is coupling of the threaded spindle, in the direction of its longitudinal axis, with one of the drivers, if necessary by way of an intermediate element.
It is possible that the threaded part can be displaced in the radial direction with reference to the threaded spindle, particularly that is can be displaced in compulsorily guided manner, and can be brought out of threaded engagement by means of displacement in the radial direction. In this way, the threaded part can be brought out of engagement with the threaded spindle in technical simple manner. Releasing the threaded part from the threaded engagement with the threaded spindle, and also bringing the threaded part into threaded engagement with the threaded spindle, can be carried out in operationally reliable and easily handled manner, in that the threaded part is compulsorily guided.
In simple manner, the threaded part can be brought out of engagement with the threaded spindle if the threaded part engages around the threaded spindle over a circumference section that extends at most over half the circumference of the threaded spindle. Then, the threaded part is present only in a small section, particularly a circular section, and can be released from the threaded spindle by means of radial displacement.
According to a further embodiment of the invention, an activation element that can be manually activated and/or activated by means of an auxiliary force is provided, by means of the activation of which element the threaded part can be brought or is brought out of threaded engagement with the threaded spindle, counter to the force of a spring element, for example. In this way, the threaded part can be released from the threaded grip with the threaded spindle, in an easy to handle manner.
If a spring element is provided, counter to the force of which the activation element is activated to bring the threaded part out of threaded engagement with the threaded spindle, the threaded part is automatically brought back into the threaded engagement by means of the reset force of the spring element when activation of the activation element has ended. For example, the activation element can be configured as a pressure element, particularly a push button, which brings the threaded part out of threaded engagement with the threaded spindle, counter to the force of a spring element, by means of a pressure force exerted by a user.
It is possible that the activation element is firmly connected with the threaded part by way of at least one connection element; in particular, the connection element should be displaceably guided on the component on which it is fixed in place, or on the base part. In this way, reliable and permanent functioning of the activation mechanism is guaranteed, in order to bring the threaded part out of engagement with the threaded spindle and also to guide it reliably back into threaded engagement.
Furthermore, the invention comprises an apparatus for machining a workpiece that has a round and/or tubular cross-section, having a holding apparatus of the type described above.
In particular, the apparatus has a machining unit that is held on the base part of the holding apparatus so as to pivot, and can be brought in the direction toward a workpiece held in the holding apparatus by means of pivoting.
The apparatus can be configured for processing of the workpiece by machine. The processing unit is then configured as a machine unit.
It can be provided that the machining unit is configured for cutting the workpiece and/or chamfering or beveling an end of the workpiece. For example, the machining unit can have a circular saw or be configured as a circular saw, for example having at least one blade or saw blade.
Furthermore, it is possible that the apparatus is configured as a hand tool.
Further goals, advantages, characteristics, and application possibilities of the present invention are evident from the following description of an exemplary embodiment, using the drawings. In this regard, all the characteristics described and/or shown in the figures form the object of the present invention, by themselves or in any desired practical combination, also independent of how they are combined in the claims or their antecedents.
The figures show:
Preferably, the holding apparatus 1 has multiple roller bodies 7, 8, 9, and 10, which are mounted so as to rotate, for example. The roller bodies 7, 8, 9, and 10 act in supporting manner, so that the holding apparatus 1 can be rotated in a plane perpendicular to the center axis of the workpiece when they are pressed against the outer surface of the workpiece. The roller bodies 7, 8, 9, and 10 can be provided in the axial direction of the workpiece, at least in pairs.
The holding apparatus 1 comprises a base part 2 and at least two clamping arms 3, 4, which proceed from there. Preferably, the clamping arms 3, 4 are held on the base part 2 so that they can pivot in the direction toward one another, for example in that the pivot arms 3, 4 are articulated onto the base part 2 with one end. The base part 2 can be formed by a frame profile, housing or the like. Preferably, the base part 2 has a base plate 11, so that a machining unit for machining the workpiece can be disposed on top of or on the side of the plate.
The clamping arms 3 and 4 are configured in such a manner and disposed on the base part 2 in such a manner that at least a part of the outside circumference surface of the workpiece can be encompassed. Preferably, for this purpose the clamping arms 3 and 4 can be rotated about a related axis of rotation 5 and 6, respectively, in each instance, wherein the axes of rotation 5, 6 are disposed at a distance from one another, preferably run essentially parallel to one another, and preferably lie essentially parallel to the center axis of the workpiece.
The clamping arms 3 and 4 are designed for exerting a holding force, preferably a clamping force on the workpiece, wherein the rotatability of the workpiece relative to the holding apparatus 1 is maintained. For this purpose, at least one of the roller bodies 7, 8, 9, 10 is disposed on each of the clamping arms 3, 4, which body can be provided in the region of the free end of the clamping arms 3, 4, for example. Preferably, further roller bodies 7, 8, 9, 10 are disposed on the base part 2 in the region between the clamping arms 3, 4.
The holding apparatus 1 has an adjustment mechanism 20 for the clamping arms 3, 4. The adjustment mechanism 20 comprises two drivers 21 and 22, and the clamping arms 3 and 4 can be pivoted toward one another by the movement of the drivers. Preferably, the drivers 21 and 22 are movement-coupled with the related clamping arm 3 or 4 by way of an intermediate element 23 or 24, respectively, for this purpose, for example in that the respective driver 21 or 22 is articulated onto the related intermediate element 23 or 24, the respective intermediate element 23 or 24 in turn is articulated onto the related clamping arm 3 or 4, and preferably, the respective intermediate element 23 or 24 is disposed at an angle relative to the related driver 21 or 22. The intermediate elements 23 and 24 can be configured in the manner of an elongated or ridge-like connection part or a strut, in each instance, or can have such a part.
The movement coupling of the drivers 21 and 22 can be implemented in such a manner that the drivers 21 and 22 each have gear-tooth systems 28, 29, and that a gear wheel 30 that meshes with the gear-tooth systems 28 and 29 is provided in between, which gear wheel forms the movement element 27. In this way, a reversal gear mechanism is formed, by means of which the drivers 21 and 22 can be moved in the direction toward one another and also in the direction away from one another, so that the clamping arms 3 and 4 can be moved both in the direction toward a workpiece to be machined and also in the direction away from the workpiece to be machined, without additional measures, by means of this reversal gear mechanism.
For this purpose, the drivers 21 and 22 can each be configured as a gear rack or can have a gear rack. Also, it can be provided that the drivers 21 and 22 have depressions, notches or passage openings, for example are configured as a hollow structure, so that the drivers 21 and 22 are relatively light, in terms of weight.
Preferably, the drivers 21 and 22 are guided in terms of their movement, particularly compulsorily guided. For this purpose, a guide 45 or 46 or one guide, in each instance, can be provided, as is evident from
The guide 45 for the driver 21 and the guide 46 for the driver 22 can be formed by a guide element 47, 48, in each instance, on which the driver 21 or 22 slides during the course of its adjustment movement, guided in a straight line in the movement direction 60. For example, the respective guide element 47, 48 can be configured as a rod, over which the related driver 21 or 22 is pushed. For this purpose, the related driver 21 or 22 can have a passage channel, a passage opening or the like, through which the rod projects, so that the driver 21 or 22 is guided so as to be displaceable by means of the related rod. Preferably, the respective guide element 47 or 48 is disposed on a component of the holding apparatus 1, fixed in place or fixed on the housing with reference to the base part 2, particularly attached to the base part 2.
A threaded spindle 31 is provided for adjusting the drivers 21 and 22, as is evident from
Preferably, the threaded spindle 31 is movement-coupled with one of the drivers 21, 22. For this purpose, an intermediate element 49 can be provided, on which the threaded spindle 31 engages, particularly is mounted so as to rotate, wherein the intermediate element 49 is firmly connected with the driver 21 (
An advancing movement of the threaded spindle 31 in the axial direction and thereby an adjustment movement of the driver 21 coupled with it comes about by means of rotating the threaded spindle 31 relative to the threaded part 32. The adjustment movement initiated by the threaded spindle 31 is transferred to both clamping arms 3 and 4 by means of the movement coupling of the driver 21 with the driver 22, by way of the movement element 27, so that in this way, the clamping arms 3 and 4 can be brought into a closed position with regard to a workpiece to be machined, by means of the threaded spindle 31, or, by means of opposite activation of the threaded spindle 31, the clamping arms 3 and 4 can be brought into an open position with regard to the workpiece to be machined.
In order to accelerate opening and closing by means of the threaded spindle 31, the holding apparatus 1 has a quick-adjustment unit. The quick-adjustment unit is formed in that the threaded part 32 can be brought out of threaded engagement relative to the threaded spindle 31 by means of radial displacement. Preferably, the counter-thread of the threaded part 32 is merely configured over a circumference section for this purpose, in order to allow the radial displacement of the threaded part 32 relative to the threaded spindle 31. In that the threaded part 32 comes out of engagement with the threaded spindle 31, displacement of the threaded spindle 31 relative to the fixed-in-place threaded part 32 and thereby adjustment of the drivers 21, 22 can be carried out, without the threaded spindle 31 having to be rotated for this purpose.
In order to displace the threaded part 32 in the radial direction and to bring it out of threaded engagement, an activation element 35 can be provided, which is a pressure element that can be manually activated, for example, so that the threaded part 32 is brought out of threaded engagement with the threaded spindle 31 by means of pressing the activation element 35. For this purpose, the threaded part 32 is firmly connected with the activation element 35, preferably by way of at least one or at least two connection elements 36 and 37, and guided in the axial displacement movement on a component provided in a fixed location relative to the base part 2.
For example, the guide can be formed by a section of the base part 2 itself, wherein the spring element 34 is situated between the activation element 35 and the section of the base part 2. In order to accelerate opening of the holding apparatus 1, it can furthermore be provided that the clamping arms 3 and 4 are automatically moved to their open position by means of the force of a further spring element 38 when the threaded part 32 is brought out of threaded engagement with the threaded spindle 31. The further spring element 38 can be configured as a torsion spring, which is disposed, for example, in the region of the respective axis of rotation 5 or 6 of the clamping arm 3 or 4, respectively.
The clamping arms 3 and 4 are moved in a direction toward one another and thereby the closed position B relative to a workpiece to be held is achieved, if, according to
The intermediate element 24 has two length sections 41 and 42, between which at least one, preferably two setting devices 40 are provided, in order to be able to change the distance of the length sections 41 and 42 relative to one another. In this way, the length of the intermediate element 24 between the articulation point 43 relative to the driver 22 and the articulation point 44 relative to the clamping arm 4 can be changed. By means of the length change of the intermediate element 24, precise adjustment of the position of the drivers 21 and 22 relative to the position of the clamping arms 3 and 4 can be carried out. The setting device 40 can be formed by a screw, for example, which is screwed into a thread, for example nut disposed on one of the length sections 41 or 42, to a greater or lesser extent. One or more counter-nuts can also be provided there for locking.
The holding apparatus 1′ according to
The counter-holders 50, 51 can be formed by a rotationally movable rolling part 55 or a torque-proof sliding part, which is mounted on a part 54 that is fixed on the housing, for example the bearing part for the rollers 9 and 10. Supplementally, further counter-holders 52, 53 or thrust bearings can be provided, which serve as a stop or restriction for the drivers 21, 22 on the side having the gear-tooth system 28 or 29. For example, the further counter-holders 52, 53 are formed by a common material projection 56 on a component fixed on the housing, particularly the base part. There, a contact surface that serves as a counter-holder or thrust bearing can provided, in each instance.
The apparatus 100 has a machining unit 110, which can be covered by a housing 120, at least in part, toward the outside. Preferably, the machining unit 110 is mounted on the base part 2 or the base plate 11 of the holding apparatus 1 so as to pivot about an axis of rotation 130, in order to move the machining unit 110 to or away from the workpiece to be machined, which is held in the holding apparatus 1 for machining.
The machining unit 110 can be configured as a processing unit that is part of a machine. Pivoting of the machining unit 110 toward the workpiece or away from the workpiece can be performed manually. For example, the machining unit 110 is configured as a circular saw for cutting the workpiece to be machined to length.
The apparatus 100 preferably functions as follows: The holding apparatus 1, together with the machining unit 110, is fitted around the workpiece to be machined, at a desired machining point, and the holding apparatus 1 is attached in this position by means of the threaded spindle 31. The drivers 21 and 22 perform a setting movement by means of the rotation of the threaded spindle 31, thereby moving the clamping arms 3 and 4 toward the workpiece to be machined and bringing them into a clamping position relative to the workpiece.
When the holding apparatus 1 is attached to the workpiece, the machining unit 110 can be pivoted toward the workpiece about the axis of rotation 130, so that the machining unit 110 can begin or does begin with machining of the workpiece. Then, rotation of the holding apparatus 1, together with the machining unit 110, around the workpiece, in the direction of the rolling path established by the clamping arms 3 and 4 and the roller bodies 7, 8, 9, and 10 follows.
After machining of the workpiece, the machining unit 110 is pivoted away from the workpiece, and the workpiece is released from the holding apparatus 1. For this purpose, the quick-adjustment unit can be activated, for one thing, in that the activation element 35 is pressed and the threaded part 32 comes out of engagement with the threaded spindle 31, and thereby the clamping arms 3 and 4 are automatically moved into the open position A, by means of the spring force of the further spring elements 38. Alternatively, it is also possible that the threaded spindle 31 is rotated during threaded engagement of the threaded part 32, and thereby the clamping arms 3 and 4 are moved apart from one another by way of the drivers 21 and 22.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2014 109 150.7 | Jun 2014 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/DE2015/100259 | 6/26/2015 | WO | 00 |
