Patent Grant
7416169
The present invention generally relates to the technical and constructional design of a hoisting-cable drive for a crane, and in particular a hoisting-cable drive comprising at least two hoisting winches, which hoisting-cable drive is suitable for raising or lowering a single bottom-hook block by means of two mechanically non-synchronised separate hoisting-cable winches without there being any danger synchronised or of tilting. Furthermore, the invention relates to a mobile crane equipped with the hoisting-cable drive according to the invention.
Furthermore, the present invention relates to a winch control system for a cable drive, comprising at least two mechanically non-synchronised hoisting winches, which winch control system is suitable for operating the cable drive such that the two sheave sets which form part of the cable drive do not tilt in relation to each other for example as a result of different elongation of the individual cable lines.
Furthermore, the invention relates to a synchronisation method for the hoisting-cable drive of a crane, comprising two hoisting winches, with which synchronisation method it is possible to operate the two hoisting winches such that the bottom-hook block of the crane does not tilt in relation to the sheave set arranged on the boom head of the crane, for example as a result of different elongation of the individual cable lines.
Due to the ever advancing technical development of modern cranes, and in particular due to developments in the mobile crane sector, which in the context of the present invention includes in particular mobile telescopic cranes and mobile crawler cranes with braced mast booms, so-called lattice boom cranes, both the load capacities and the dimensions of the cranes, in particular the boom lengths of mobile cranes, are increasing significantly. However, this primarily positive development in crane design results in the cable drives that are necessary for hoisting operations of the cranes meeting their technical limits with increased frequency.
Due to the ever increasing carrying capacity of cranes, the tensile forces which a hoisting cable has to withstand are clearly increasing. In the case of unchanged materials characteristics this often leads to an increase in the cable diameter. As a rule this is also associated with a further increase in the diameter of the cable drums or the hoisting winches. Furthermore, due to the ever increasing dimensions of the cranes, in particular of the boom lengths, the cable lengths that have to be stored on the cable drum also increase, which also results in increasing winch diameters or cable drum diameters. These ever increasing winch diameters or cable drum diameters in turn require ever increasing driving torques of the winches; driving torques which at times can now hardly be generated with the usual drive units.
In order to satisfy the need for ever increasing sizes of winch drums or cable drums and the associated increase in driving torques, the use of a so-called double bottom-hook block as shown in
However, such double bottom-hook blocks with mechanical load equalisation often prove disadvantageous because, as a result of the increased design height due to the mechanical load equalisation, they directly result in a loss of hoisting height. Furthermore, double bottom-hook blocks always comprise multiple joints, which in particular during slinging and putting down cause problems so that such double bottom-hook blocks overall are relatively unwieldy. Because double bottom-hook blocks have to provide load equalisation for very considerable forces, namely for the sum of the forces from several hoisting-cable lines, these double bottom-hook blocks are often very solid and extremely difficult to handle.
Another known approach to the problem of synchronising two separate winches for the hoisting-cable drive of a crane provides for the two winches to be synchronised directly mechanically, for example by means of a toothed wheel arrangement. It is also known to continuously monitor the angular velocity of two separate hoisting winches and to equalise any difference in speed by changing the angular velocity of at least one of the two winches. Since it is not possible—either by means of mechanical synchronisation or by means of monitoring the angular velocity of the hoisting winches—for example to take into account different cable elongation in the two hoisting-cable lines, this approach to synchronising two hoisting winches is also unsatisfactory. Furthermore, in these synchronisation methods it is not possible to take into account the influence that the cable layer at the time has on the respective cable drum, or to take into account other geometric influences such as for example small differences in the diameters of the cables. Accordingly, cable drives that are operated by means of such known synchronisation methods often have a tendency to stress the individual cable lines unevenly, which at times in extreme cases can lead to overloading.
In U.S. Pat. No. 5,579,931 A an improved method and system for a liftcrane in which a load is lifted through the combined action of first and second hoist drums are disclosed. The known method and system use a first rope wound on one hoist drum and a second rope wound on the second hoist drum. The ends of the ropes opposite the hoist drums are linked together to transmit tension between them. The load is coupled to the ropes. If the take up speed of one of the ropes exceeds the take up speed of the other, the linked ends of the ropes will shift. This condition is detected and the operation of at least one of the first and second hoist drums is modified to bring the take up rates into balance. This system is advantageously used with a hoist block sheave arrangement. This system can also be used with a single rope in which each of the ends of the single rope are wound on a separate one of the hoist drums and the load is coupled to the middle of the rope.
U.S. Pat. No. 6,651,961 B1 discloses a multi-block rigging system for a heavy crane, pulling or lifting device. The system uses sheave blocks in series orientation to enable the use of standard, economical or preferred, size winch drums and standard, economical or preferred, diameter and length wire rope, each forming a separate set of reeving lines. Each set of reeving lines moves its corresponding load block a proportional distance of the total travel length for the load hook. Alternatively, different line parts of line for each reeved set enables different travel speeds of the load block for different capacity requirements.
In DE 34 04 505 A1 a length compensation between two ropes in a rope drive, in particular for cranes, is disclosed. Here, the free ends of two ropes are in each case attached to two jokes, from which at least two rope sections are passed over compensating pulleys, the two rope sections consisting of a right-hand and a left-hand wire rope.
DE 41 30 970 A1 corresponding to U.S. Pat. No. 5,377,296 A discloses a control system for an electric motor arranged to drive a rope drum of a mine winder or a hoist system which includes a conveyance supported by a rope and which forms an oscillating system. The known control system includes a load sensor which monitors the load in the rope and a rope length sensor which monitors the length of rope paid out from the rope drum. A motor control unit is responsive to signals from the sensors and calculates set points for speed, acceleration and jerk of the oscillating system. The control unit generates a control signal which is related to a natural oscillation mode of the oscillating system so as to prevent the excitation of oscillations in the system, and controls a motor drive in accordance with the control signal.
A further control and hydraulic system for liftcrane is known from EP 0 422 821 B1 corresponding to U.S. Pat. Nos. 5,189,605 A, 5,297,019 A, and 5,579,931 A. This known lift crane includes controls by which an operator can run the lift crane and mechanical subsystems each powered by a closed loop hydraulic system having a pump and an actuator. According to this known system a controller responsive to the controls and connected to the mechanical subsystems is provided, and further the controller is capable of running a routine for controlling said mechanical subsystems to define operation of the lift crane.
It is thus an object of the present invention to provide a hoisting-cable drive which is not associated with the previously described disadvantages of a double bottom-hook block, and which is also not subjected to the previously described effects of the synchronisation methods briefly mentioned above, which synchronisation methods relate to two separate hoisting winches.
According to a first aspect of the present invention, this object is met by a hoisting-cable drive for a mobile crane which does not comprise a previously described double bottom-hook block of complex construction, but instead comprises a single bottom-hook block which comprises a sheave set that has at least two pulleys. Furthermore, the hoisting-cable drive according to the invention comprises a sheave set, arranged on the boom head of the mobile crane, which sheave set also comprises at least two pulleys, two mechanically non-synchronised hoisting winches, two separate hoisting-cable lines and a kinematic force equilibrium device that is arranged on the boom head or on the bottom-hook block. In this arrangement, starting from one of the two hoisting winches, each of the two hoisting-cable lines is reeved to the single bottom-hook block by way of one of the pulleys, of which there are at least two, arranged on the boom head, from where it leads to the force equilibrium device. The kinematic force equilibrium device arranged on the boom head or on the single bottom-hook block is advantageous in that as a result of its kinematic design it equalises any possibly existing different tensile forces in the two cable lines, which different tensile forces can for example arise as a result of different cable elongation or incorrect synchronisation of the hoisting winches.
In contrast to a known double bottom-hook block, it is thus not necessary for the two separate sheave sets of the double bottom-hook block to comprise a complex mechanical load equalisation device which, as already mentioned above, is very solid and difficult to handle. Instead, the kinematic force equilibrium device according to the invention, which device can also be detachably attached as a separate device to the boom head or to the single bottom-hook block, makes possible the use of a single bottom-hook block which due to its simple design is less solid and thus easier to handle than a comparable double bottom-hook block. Since due to the kinematic force equilibrium device it is thus no longer necessary to use a double bottom-hook block to provide load equalisation, the previously described disadvantages of a double bottom-hook block can be avoided.
According to an exemplary embodiment of the hoisting-cable drive according to the invention, the kinematic force equilibrium device is an equalising swivel which is hinged to the boom head or to the single bottom-hook block. This equalising swivel is designed as a lever mechanism, wherein the rotary joint of the lever is connected to the boom head or to the single bottom-hook block.
According to a further aspect of the present invention, the ends of the two hoisting-cable lines are attached to the two opposing legs of the equalising swivel. This arrangement preferably provides for the two ends of the two hoisting-cable lines to be attached to the respective ends of the opposing legs of the equalising swivel at the same distance from the hinged joint of the lever mechanism. However, it is of course also possible to deliberately attach the ends of the two hoisting-cable lines at a different distance from the fulcrum of the lever mechanism, for example to counter different geometric or kinematic relationships or different force relationships in the respective hoisting-cable lines, such as for example different sheave diameters or different cable line arrangements, for example due to different cable types and/or winches.
By arranging the hoisting-cable drive according to the invention with a kinematic force equilibrium device, for example in the form of a hinged equalising swivel, equalisation of different cable elongation or equalisation of incorrect synchronisation of the two hoisting winches can be achieved. For example, in that one cable line of the hoisting-cable drive is elongated more than the other cable line, this will lead to the equalising swivel adjusting itself according to the different cable elongation until the forces in both hoisting-cable drives are the same again.
In order to prevent excessive twisting of the equalising swivel due to ever increasing different cable elongation or due to incorrect synchronisation of the two hoisting winches, according to a further aspect of the present invention the hoisting-cable drive according to the invention comprises a registering device, for example a limit switch or a winch control system that will be explained in more detail below, wherein said registering device monitors the kinematic change in the state of the force equilibrium device and controls the rotary speed of the winch or winches accordingly.
As already mentioned, the registering device can be a simple limit switch which detects a maximum permissible kinematic change in the state of the force equilibrium device, such as for example a maximum permissible twisting, and transmits this information to the winch synchronisation control system.
According to a further aspect of the hoisting-cable drive according to the invention, said hoisting-cable drive comprises a winch synchronisation control system which, for example by processing the signals of the limit switch or generally by processing the registered kinematic change in state, adjusts the rotary speed of at least one of the two hoisting winches so that the length of both cable lines between the boom head and the single bottom-hook block is essentially always kept the same. Providing the hoisting-cable drive with a registering device and with a winch synchronisation control system is thus advantageous in that, in contrast to the known solution comprising a double bottom-hook block, wherein there is no longer a danger that due to excessively different elongation of one cable line the bottom-hook block twists excessively, which can lead to overload of the other cable line.
According to a further exemplary embodiment of the hoisting-cable drive, the kinematic force equilibrium device is an equalising roller by way of which one of the two hoisting-cable drives is deflected and conveyed to the other hoisting-cable drive. While this equalising roller involves a different design of the kinematic force equilibrium device, the design is based on the previously explained lever principle, since, as is known, such an equalising roller is comparable to a lever mechanism with corresponding lever arm length.
In the described embodiment using an equalising roller it is however possible, instead of using two completely separate hoisting-cable lines that can be rolled up on a separate hoisting winch each, to use only a single cable so that the two hoisting-cable lines are actually formed by a single cable. This embodiment actually involving a single cable is advantageous in that in this embodiment there is no limit state that must not be exceeded.
Of course it is also possible to provide the two hoisting-cable lines by means of two separate hoisting cables which at a joint are connected so as to be resistant to tension. However, since such a joint of two hoisting cables as a rule comprises larger dimensions or diameters than the respective cables themselves, it is normally not permitted to let this joint travel past the equalising roller due to different elongation behaviour of one of the two cables or due to incorrect synchronisation of one of the two hoisting winches. In order to prevent this from happening, the hoisting-cable drive comprises a registering device which monitors the relative position of the joint in relation to the equalising roller. If the joint between the two separate hoisting cables of the equalising roller comes within close proximity of the equalising roller, the registering device transmits a control signal to the winch synchronisation control system which then by processing this control signal adjusts the rotary speed of at least one of the two hoisting winches so that the joint moves away from the equalising roller.
Furthermore, it is possible to equip the hoisting-cable drive with a winch synchronisation control system which by processing the continuously registered kinematic change in state, which also includes registering the joint between the two separate hoisting cables, continuously adjusts the rotary speed of at least one of the two hoisting winches such that the length of both cable lines between the boom head and the single bottom-hook block is always essentially the same.
The two described exemplary embodiments using an equalising swivel or an equalising roller, for example integrated in the roller set on the boom head, thus prove advantageous in that it is possible, by a simple redesigning measure, even without reconstruction measures, to counter the disadvantages of a double bottom-hook block, in that, instead of using such an unwieldy double bottom-hook block, a single bottom-hook block that is easy to handle can be used for a hoisting-cable drive with two hoisting winches.
According to a further exemplary embodiment of the present invention a hoisting-cable drive comprising two controllable hoisting winches is provided, which hoisting-cable drive can also be operated with a single bottom-hook block with a sheave set comprising at least two pulleys, wherein said sheave set just like the previous embodiment is a sheave set arranged on the boom head of the mobile crane, which sheave set comprises at least two pulleys, wherein two separate hoisting-cable lines are wound onto the two separate hoisting winches, which hoisting-cable lines are reeved to the single bottom-hook block, starting from one of the two hoisting winches, by way of one of the pulleys, of which there are at least two arranged on the boom head. In order to equalise any load differences that may be present between the two hoisting-cable lines, the hoisting-cable drive according to the invention comprises a hoisting-cable load pickup at least within each hoisting-cable line arrangement, wherein said hoisting-cable load pickup detects any load differences present between the two cable lines so that such a load difference can be equalised by way of adjustment of the rotary speed of the two hoisting winches.
Due to the adjustment of the rotary speed of one of the two hoisting winches it is thus possible to equalise any existing load differences between the two cable lines, which differences can occur for example as a result of different elongation of the cables, by way of simple control of the rotary speed of one of the two winches so that it is no longer necessary to provide a double bottom-hook block for the purpose of load equalisation, which double bottom-hook blocks, as has been described above, are associated with a multitude of disadvantages.
According to a further aspect of the embodiment of the hoisting-cable drive with at least one load pickup within each cable line arrangement, the two hoisting-cable load pickups directly measure the tensile force in the respective cable lines. This can for example take place in that the two hoisting-cable load pickups are arranged on the respective ends of the two hoisting-cable lines so that the two ends of the two hoisting-cable lines are attached to the boom head or to the single bottom-hook block by way of a hoisting-cable load pickup.
Instead of measuring the tensile forces in the respective hoisting-cable lines directly, it is of course also possible to measure the tensile force in both cable lines indirectly, for example by way of determining the deflection force or bearing force at a deflection position of the respective cable lines. This can for example be achieved in that for registering the respective deflection force the two hoisting-cable load pickups are arranged on the sheave set arranged on the boom head.
According to a further exemplary embodiment of the hoisting-cable drive according to the invention, said hoisting-cable drive can comprise a sheave set with at least two pulleys; and can further comprise a sheave set arranged on the boom head of the mobile crane, which sheave set also comprises two pulleys; two mechanically non-synchronised hoisting winches; two separate hoisting-cable lines which are reeved to the single bottom-hook block, starting from one of the two hoisting winches by way of one of the pulleys, of which there are at least two, arranged on the boom head; as well as a winch control system which, by registering and processing the geometric winch states and equipment states of the mobile crane, adjusts the rotary speed of at least one of the two hoisting winches in such a way that the length of the two cable lines between the boom head and the single bottom-hook block is always essentially the same. Any references to geometric winch states in the context of the present invention refer for example to the current cable layer, the coiling diameter of the current cable layer, or for example to the winch rotations completed since a starting state, as well as to other influences and dimensions which may have an influence on synchronous operation.
According to a particular aspect of this embodiment of the hoisting-cable drive, it is thus provided for the winch control system to adjust the rotary speed of at least one of the two hoisting winches by registering and processing at least the present cable layer and/or the winch rotations that have already been carried out. In contrast to known synchronisation methods for two hoisting winches, which methods usually only keep the angular velocity or rotational speed of the two winches constant, which however due to different cable layers in both hoisting winches can result in different cable speeds, with the use of the proposed winch control system it is possible to also register the influences of different cable layers of both hoisting winches and thus to achieve exact synchronous operation of both hoisting winches, in particular as far as the two cable speeds are concerned.
According to a further aspect of the present invention, a winch control system for operating a cable, such as for example the hoisting-cable drive of a mobile crane, is provided, which hoisting-cable drive comprises a first and a second sheave set, at least two mechanically non-synchronised hoisting winches and at least two separate cable lines, which, starting from one of the two hoisting winches, are reeved to the second sheave set by way of the first sheave set, wherein the winch control system comprises:
According to a particular aspect of the invention, the registering device of the winch control system according to the invention comprises at least one load pickup within each cable line arrangement, which load pickup has already been described above in the context of the design of a cable drive with at least one hoisting-cable load pickup within each cable line arrangement, wherein at this point reference is made to the above position. As already described in said position, the load pickup is suitable for directly measuring the tensile forces present in the cable lines, of which there are at least two. To this effect the registering device can for example comprise at least two load cells, of which one in turn is arranged within each cable line arrangement. As also already mentioned above, it is however also possible for the load pickups to determine the force in the cable lines, of which there are at least two, indirectly by determining the deflection forces or the bearing forces at a deflection position of the respective cable line.
According to a further aspect of the invention, as an alternative the registering device can also register at least the respective current cable layer and/or the revolutions that each of the hoisting winches, of which there are at least two, has already carried out, as already described above.
The winch control system has proven advantageous in particular in that in the case of recording the current cable layer and/or the winch revolutions already carried out there is no need to make design changes to the cable drive itself, and in the case of registering the tensile forces by means of load pickups, only minor design changes to the cable drive itself are needed. In particular there is no need to use a double bottom-hook block, with the associated disadvantages as described above, for operating two hoisting winches.
According to a still further aspect of the present invention, a synchronisation method for the hoisting-cable drive of a crane is provided, which hoisting-cable drive comprises a single bottom-hook block with a sheave set comprising at least two pulleys; and further comprises a sheave set arranged on the boom head of the crane, which sheave set also comprises at least two pulleys; two controllable hoisting winches; two separate hoisting-cable lines which are reeved in, starting from one of the two hoisting winches by way of one of the pulleys, of which there are at least two, arranged on the boom head; wherein the method comprises the following steps:
Of course it is advantageous if the synchronisation method is implemented with the use of the previously described winch control system. As has been described in the respective position explaining the winch control system, it is advantageous if the varying force states during operation of the hoisting-cable drive are registered in that the tensile force in the two hoisting-cable lines, of which there are at least two, is registered directly by means of a load pickup, such as for example a load cell.
As an alternative to the above it is of course again also possible to register the force states that vary during operation of the hoisting-cable drive in that the tensile force in the two hoisting-cable lines, of which there are at least two, is measured indirectly by determining the deflection force or the bearing force in a deflection position of the respective cable line.
According to a further aspect of the synchronisation method it is also possible to adjust the rotary speed of the winch by registering and processing the geometric winch states and equipment states of the crane, wherein registering the geometric winch states and equipment states of the crane can take place in that at least the respective current cable layer and/or the winch revolutions already carried out, which winch resolutions are counted starting from an initial state, with such registering taking place for each of the hoisting winches, of which there are at least two.
Generally, according to the present invention, a continuous detection of the actuating variable allows a continuous control of the winder speed of the winches. Contrary to the prior art showing the detection of stop positions or end positions the invention as disclosed provides a solution by which during the lifting of a load dynamic appearing compulsory can be effectively limited.
Furthermore, according to the invention, the controlled characteristic of the hoisting-cable drive can be adjusted and, in particular, the controlled characteristic of each winch can be adjusted in a wide range and in small increments.
In addition, the general method and device according to the invention generally enable the use of identical or non-identical winches with identical or different diameters and/or identical or different manufacturing tolerances, unequal rope length, unequal rope diameter and identical or different rope reevings in a hoisting-cable drive.
Generally, a length detection device as for example used in an inventive system, enables to measure the absolute position of the connecting point (also referred to as joint) of both hoisting-cable lines. In accordance with the invention, a predefined, but also variable reference position exists for this connecting point. The reference position and the actual position refer to a predefined center of reference. The center of reference can be a position at the crane, or at a part of the crane, and/or a point or position outside the crane, for example at a building, a tower, a position on the ground, or in the sky, for example given by satellites used for GPS navigation. In particular, according to the invention, the deviation of the actual position of the connecting point of the two cable lines in relation to the reference position of the connecting point may be measured by using the known GPS-navigation system or another known method for continuously measuring the deviation of the joint from the reference position.
In a preferred embodiment of the invention the length difference between the actual position and the reference position of the joint of the two cable lines is considered as an actuating variable at the control of the different rotational speeds of the two winches. From the rotational speed of the first winch results an associated rotational speed of the second winch due to ensure that the reference position of the joint does not change.
The measuring of the distance of the deviation of the actual position of the connecting point from the reference position may take place by a direct, continuous detection and is considered in the control of the rotational speeds of the winches.
In a further exemplary embodiment of the invention a maximum actuating variable may be used to avoid a condition which is critical with regard to safety. Such a situation which is critical with respect to safety may be given in the case that the connecting point enters into the sheave sets of a head or the bottom-hook block of a crane.
Below, for an improved understanding and for further explanation of the present invention, a known double bottom-hook block and several embodiments of the present invention are described in more detail with reference to the enclosed drawings.
In all figures, identical parts are designated by corresponding or essentially similar reference characters.
As shown in the perspective view of
In the position drawn in bold outline, the equalising swivel 17 is in its home position, i.e. its legs extend at a right angle in relation to the luffing plane of the crane. Moreover,
In order to ensure that the equalising swivel 17 does not exceed a maximum permissible excursion angle, the hoisting-cable drive according to the invention comprises a registering device which monitors the kinematic change in the state of the equalising swivel 17. In a case where for example the excursion angle α were to become excessive and thus approach a maximum permissible equalisation angle, the registering device 18 registers this and communicates the respective current excursion angle α to the winch synchronisation control system 19, which then by processing the registered excursion α adjusts the rotary speed of at least one of the two hoisting winches 7, 8 such that the length of the two cable lines between the boom head, which in this diagram is shown by a dot-dash line, and the single bottom-hook block 15 is essentially the same again.
In the example shown in
As shown in the diagram, the second hoisting-cable line 10 is reeved to the single bottom-hook block 15 by way of one of the winding rollers 12 as well as by way of the pulley 14 from which it leads to the equalising roller 20 which deflects this second hoisting-cable line 10 a second time before being connected to the first hoisting-cable line 9 below the equalising roller 20. This connection of the two hoisting cable lines 9, 10 is diagrammatically shown by a dot. Instead of connecting the hoisting cable made of two separate hoisting-cable lines 9, 10 by way of a joint 30 as shown, it is of course also possible to actually form the two hoisting-cable lines from one single cable only, whose respective ends are reeled up by the hoisting winches 7, 8.
If we assume that the position shown in
By the way, it is also possible to omit the equalising roller 20. In this case, the amount by which the joint 30 of the two cable lines 9, 10 is rising or lowering is continuously measured or measured isochronous. With other words: the deviation ΔX of the joint 30 from a reference position X is continuously measured (or measured isochronous) and the measured deviation ΔX is considered in calculating the respective rotational speed of at least one winch 7, 8. Alternatively, instead of the joint 30 any predetermined point on the cable lines 9, 10 can be monitored with respect to a lowering or rising. For example, it is possible to detect if the joint 30 or a predetermined point on one of the cable lines 9, 10 changes its position compared with a reference position. The reference position may be a point on the crane or outside the crane. Alternatively, it is e.g. possible to monitor the deviation of the joint 30 or the predetermined point on one of the cable lines 9, 10 by using a GPS system.
In a way different to the embodiment shown in
In the present paragraph a modification of the third embodiment, shown in
As can be seen from the above description, the winch control system according to the invention is not only suitable for the hoisting-cable drive of a crane with two hoisting winches, but also for any cable drive operated with two separate winches.
In
With reference to
Finally, with reference to
As has already been explained in the above description of the figures, registering can take place in the first step of the method, in that the tensile force is directly measured in the hoisting-cable lines 8, 10, of which there are at least two. As an alternative to this it is also possible to register the tensile force of the hoisting cable in that the tensile force in the hoisting-cable lines 9, 10, of which there are at least two, is measured indirectly by way of determining the deflection forces or bearing forces at a deflection position of the respective cable lines 9, 10.
Of course it is also possible to combine the individual embodiments of the present invention. Thus, it is for example possible to combine a hoisting-cable drive comprising an equalising swivel with at least one hoisting-cable load pickup 21 within the cable line arrangement of each hoisting-cable line 9, 10, or to combine it with the winch control system 18, 19 according to the invention. The individual embodiments of the present invention can thus be combined in any desired manner in order to achieve an optimum synchronisation result.
This application is the National Stage of PCT International Application No. PCT/EP2005/008157, filed Jul. 27, 2005, which application published in English and is hereby incorporated by reference in its entirety; said international application claims priority from U.S. Provisional Patent Application No. 60/598,091, filed Aug. 2, 2004 which is incorporated by reference in its entirety.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2005/008157 | 7/27/2005 | WO | 00 | 5/2/2007 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2006/013053 | 2/9/2006 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 5189605 | Zuehlke et al. | Feb 1993 | A |
| 5297019 | Zuehlke | Mar 1994 | A |
| 5314082 | Konop | May 1994 | A |
| 5377296 | Greenway et al. | Dec 1994 | A |
| 5579931 | Zuehlke et al. | Dec 1996 | A |
| 6460711 | Kato et al. | Oct 2002 | B1 |
| 6598859 | Kureck et al. | Jul 2003 | B1 |
| 6651961 | Meyer | Nov 2003 | B1 |
| Number | Date | Country |
|---|---|---|
| 1916644 | Nov 1970 | DE |
| 3404505 | Sep 1985 | DE |
| 4130970 | Apr 1992 | DE |
| 2081769 | Dec 1971 | FR |
| 62186894 | Aug 1987 | JP |
| Number | Date | Country | |
|---|---|---|---|
| 20070290182 A1 | Dec 2007 | US |
| Number | Date | Country | |
|---|---|---|---|
| 60598091 | Aug 2004 | US |
