Cable tensioning system

Abstract

A cable tensioning system includes: a body defining a balance point; a cable receiving area having clamping elements configured to clamp and bias a cable relative to the cable tensioning system; and a sensor configured to sense changes in the balance of the body about the balance point, wherein the cable tensioning system is configured to maintain the cable within a preset tension range.

Description

Technical Field

[0001] The present subject matter relates generally to cable tensioning systems and, more particularly, to active cable tensioning systems. Background Art

[0002] Cables are often used in service operations of equipment such as gas turbine engines. For example, cables may include umbilical cables that provide control functions, cameras, lights, and process chemical conduits. As service operations proceed, the cables may be affected by loading conditions or move relative to the equipment. In order to provide better service, it may be important to maintain a specific tension in the cables during these operations. In addition, maintaining tension in the cables can reduce the potential for tangling.

[0003] Traditionally, the tension of the cable is maintained by hand. That is, an operator pulls on the cable, adding and removing slack from the cable to approximate an equal tension distribution. Thus, the industry continues to demand improved cable tensioning systems for maintaining tension in any cable distribution system. Summary of the invention

[0004] Aspects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.

[0005] In an exemplary embodiment of the present disclosure, a cable tensioning system comprises: a body defining a balance point; a cable receiving area having a clamping element configured to clamp and bias a cable relative to the cable tensioning system; and a sensor configured to sense changes in the balance of the body about the balance point, wherein the cable tensioning system is configured to maintain the cable within a preset range of tension.

[0006] According to another exemplary embodiment, a cable tensioning system includes: a body defining a balance point; a plurality of clamping elements configured to clamp and bias a cable relative to the cable tensioning system; an adjustable counterweight; a sensor configured to sense changing tension of the cable; a logic element configured to receive the sensed changes in tension of the cable and provide correction instructions to maintain the cable within a preset range of tension; and a motor connected to at least one of the clamping elements and configured to rotatably bias the at least one clamping element in response to the correction instructions from the logic element, wherein the preset range of tension can be adjusted using the adjustable counterweight.

[0007] According to another exemplary embodiment, a method of maintaining tension in a cable comprises inserting a cable into a cable receiving area of ​​a cable tensioning system, the cable receiving area comprising a plurality of clamping elements; sensing a change in balance of the cable tensioning system about a balance point of the cable tensioning system; and biasing the clamping elements relative to the cable in response to the sensed change in balance.

[0008] These and other features, aspects and advantages of the present invention will become better understood with reference to the following description and appended claims.The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] A full and enabling disclosure of the present invention, including the best mode thereof, is set forth in the specification with reference to the accompanying drawings for those skilled in the art.

[0010] Figure 1 is a front perspective view of a cable tensioning system according to an exemplary embodiment of the present disclosure.

[0011] Figure 2 is a rear perspective view of a cable tensioning system according to an exemplary embodiment of the present disclosure.

[0012] Figure 3 is a partial cutaway view of a cable tensioning system according to an exemplary embodiment of the present disclosure.

[0013] Figure 4 is a front schematic diagram of a cable tensioning system in a configuration configured to receive a cable according to an exemplary embodiment of the present disclosure.

[0014] Figure 5 is a schematic diagram of a cable tensioning system according to another embodiment of the present disclosure.

[0015] Figure 6 is a schematic diagram of a cable tensioning system in use according to an exemplary embodiment of the present disclosure.

[0016] Figure 7 is a schematic diagram of a cable tensioning system according to an exemplary embodiment of the present disclosure.

[0017] Figure 8 is a flow chart of a method of maintaining tension in a cable according to an exemplary embodiment of the present disclosure.

[0018] Repeat use of reference characters in the present specification and drawings is intended to represent the same or analogous features or elements of the invention. DETAILED DESCRIPTION

[0019] Reference will now be made in detail to the present embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. The detailed description uses numerical and letter references to refer to features in the drawings. Like or similar reference numbers in the drawings and description have been used to refer to like or similar parts of the invention.

[0020] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. In addition, each example is provided by way of illustration of the invention rather than limitation thereof. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope of the invention. For example, a feature illustrated or described as part of one embodiment may be used with another embodiment to yield a further embodiment. Thus, it is intended that the present invention cover such modifications and variations as fall within the scope of the appended claims and their equivalents.

[0021] As used herein, the terms "first," "second," and "third" may be used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of a single component. The singular forms "a," "an," and "the" include plural references unless the context clearly indicates otherwise. The terms "coupled," "fixed," "attached to," and the like refer to direct coupling, fixing, or attachment as well as indirect coupling, fixing, or attachment through one or more intermediate components or features, unless the context clearly indicates otherwise.

[0022] The terms "front" and "rear" refer to relative positions within a gas turbine engine or vehicle, and refer to the normal operating attitude of the gas turbine engine or vehicle. For example, with respect to a gas turbine engine, front refers to a position closer to the engine inlet, and rear refers to a position closer to the engine exhaust. The terms "upstream" and "downstream" refer to relative directions of fluid flow in a fluid path. For example, "upstream" refers to the direction from which the fluid is flowing, and "downstream" refers to the direction toward which the fluid is flowing.

[0023] Approximate language used throughout the specification and claims herein is applied to modify any quantitative representation that can be allowed to vary without causing a change in the basic function to which it is related. Thus, the value modified by a term or terms (e.g., "about," "approximately," and "substantially") is not limited to the specified precise value. In at least some instances, approximate language can correspond to the accuracy of an instrument used to measure a value, or the accuracy of a method or machine used to construct or manufacture a component and / or system. For example, approximate language can refer to within a 10 percent margin.

[0024] Here and throughout the specification and claims, range limitations are combined and interchanged, such ranges are identified and include all sub-ranges contained therein unless context or language indicates otherwise. For example, all ranges disclosed herein include the endpoints, and the endpoints are independently combinable with each other.

[0025] According to one or more embodiments described herein, a cable tensioning system can generally maintain the tension of a cable within a desired tolerance. The cable tensioning system can include a clamping element, such as a roller, that engages the cable and biases the cable to maintain a constant or substantially constant cable tension. As used herein, the term "bias" refers to applying a force along the cable. In an exemplary embodiment, the force can be applied to the cable from the cable tensioning system by rotating the clamping element so as to cause the cable to shift in a longitudinal direction. In a particular embodiment, the cable tensioning system can rotate about a balance point due to the displacement of the cable in the longitudinal direction. In response to detecting the rotation of the cable tensioning system, the clamping element can apply a corrective rotation relative to the cable so as to maintain the rotational balance of the cable tensioning system. A balanced cable tensioning system can be associated with a substantially constant tension within the cable.

[0026] Now referring to the accompanying drawings, Figure 1 A front perspective view of a cable tensioning system 100 is illustrated, according to exemplary embodiments described herein. Figure 2 A rear perspective view of a cable tensioning system 100 is shown according to an exemplary embodiment. The cable tensioning system 100 can generally include a body 102 defining a balance point 104. In one embodiment, the balance point 104 can correspond to a pivot axis about which the body 102 can pivot. In another embodiment, the balance point 104 can include a non-pivoting load determination method, such as using a tensiometer to measure the relative tension within the cable tensioning system 100.

[0027] The connector 106 may be disposed at or near the balance point 104. The connector 106 may be configured to couple the cable tensioning system 100 to a complementary connector 108 ( Figure 6 ), such as tripods, accessories mounted on the machine being serviced (e.g., inspection, repair, etc.) or nearby equipment, etc.

[0028] In one embodiment, the support system 110 may include a mount configured to receive the cable tensioning system 100. The mount may be attached to a machine being serviced. For example, the mount may be attached to a portion of a gas turbine engine undergoing a service operation. In some instances, the mount may be used to align a cable to be tensioned by the cable tensioning system in a desired position and / or angular orientation relative to the gas turbine engine, the cable tensioning system 100, or both. That is, for example, the mount may redirect the cable in a desired manner. The mount may include one or more adjustable features configured to selectively align the cable for use in a tensioning operation. For example, if the mount is required to be offset from an entry point into the engine, which may result in cable rubbing, one or more pulleys or other adjustable features of the mount may be selectively adjusted to offset the cable and prevent rubbing.

[0029] In one embodiment, the coupling 106 can be coupled to the body 102 of the cable tensioning system 100 through the balance point 104. In one embodiment, the coupling 106 can be coupled to the body 102 through the intermediate plate 105. Figure 2 The exemplary balance point 104 depicted in FIG. 1 includes a bearing assembly, such as a ball bearing assembly, including a first (e.g., inner) hardware 104A, a second (e.g., outer) hardware 104B, and a race 104C disposed therebetween. The second hardware 104B is coupled to the intermediate plate 105, and the first hardware 104A is coupled to the body 102. Figure 2 The race 104C depicted in the figure includes a plurality of ball bearings arranged between the first hardware 104A and the second hardware 104B. In other embodiments, the race 104C can be replaced by another bearing interface, such as a low friction intermediate bearing member (e.g., a PTFE sleeve), etc. Alternatively, the race 104C can include roller bearings. It should be understood that other interfaces between the intermediate plate 105 and the body 102 can be used in accordance with the disclosure contained herein. In addition, in some instances, the connector 106 can be connected to the body 102 through one or more other intermediate elements.

[0030] One or more cable tensioning systems 100 described herein may be portable and may be easily deployed at existing operating locations. The cable tensioning system 100 may not require the use of a drum spool or other winding apparatus. Instead, the cable tensioning system 100 may include one or more discrete components that may be integrated into an existing workflow. For example, the cable tensioning system 100 may be introduced into an area where a machine is operating and deployed in the area for maintaining cable tension in one or more cables in the area.

[0031] Figure 3A partially cut-away front view of the cable tensioning system 100 is shown. More particularly, a portion of the cover of the body 102 is shown cut away to reveal the cable receiving area 112 below. The cover of the body 102 can cover the cable receiving area 112 to reduce the visibility of the clamping point. The cable receiving area 112 can include one or more clamping elements 114 configured to clamp the cable C. In an embodiment, the one or more clamping elements 114 include a plurality of clamping elements 114, such as at least two clamping elements 114, such as at least three clamping elements 114, such as at least four clamping elements 114, such as at least five clamping elements 115. In the illustrated embodiment, the cable receiving area 112 includes three clamping elements, including a first clamping element 114A, a second clamping element 114B, and a third clamping element 114C. The first clamping element 114A and the second clamping element 114B can be passively arranged. That is, the first clamping element 114A and the second clamping element 114B can be unactuated. The third clamping element 114C may be active, i.e., driven. In one embodiment, the third clamping element 114C is driven by a motor 116 ( Figure 1 ) driven. In a particular embodiment, the third clamping element 114C can be arranged between the first clamping element 114A and the second clamping element 114B. More specifically, the third clamping element 114C can be arranged relative to the first clamping element 114A and the second clamping element 114B so that the third clamping element 114C biases the cable C into both the first clamping element 114A and the second clamping element 114B. The biasing of the cable C can include introducing a force into the cable C, such as by rotation of one or more of the clamping elements 114. Other arrangements of the plurality of clamping elements 114 are contemplated without departing from the scope of the present disclosure.

[0032] At least one of the clamping elements 114 may include a clamping surface 118. The clamping surface 118 may include a texture, a spatial geometry, etc. configured to enhance the grip with the cable C. For example, the texture may include knurling, castellation, bevels, teeth, pointed teeth, etc. An exemplary spatial geometry may include a circumferentially extending channel into which the cable C may be securely fitted. When the clamping elements 114 are stationary, the cable C clamped between the clamping elements 114 may be maintained in a relatively fixed position relative to the cable tensioning system 100. That is, the clamping elements 114 may be configured to maintain a portion of the cable C disposed within or adjacent to the cable tensioning system 100 in a relatively fixed position when the clamping elements 114 are stationary (i.e., not rotating). The clamping elements 114 may be movable, such as rotatable, to feed the cable C into and out of the cable receiving area 112. For example, the clamping element 114 can be a roller configured to rotate about one or more axes, such as one or more axes oriented perpendicular to the longitudinal axis of the cable C. In some examples, the motor 116 can rotate the third clamping element 114C in a direction corresponding to the arrow 120 to feed the cable C in and out in the direction C1. In this way, the tension in the cable C can be reduced. In other examples, the motor 116 can rotate the third clamping element 114C in a rotational direction corresponding to the arrow 122 to reel in the cable C. In this way, the tension in the cable C can be increased. As the cable C is pulled thereby, the first clamping element 114A and the second clamping element 114B can rotate passively.

[0033] The cable C extends from the cable receiving area 112 in two directions - an upstream direction C1 and a downstream direction C2. In the illustrated embodiment, the upstream direction C1 corresponds to a portion of the cable C under tension, such as interfacing with a tool at its working end. The portion of the cable C under tension may correspond to a working end of the cable C where it is desired to maintain the cable tension within a preset tension range. Meanwhile, the downstream direction C2 may correspond to excess cable C that does not require tension. For example, the downstream direction C2 may correspond to excess cable that is not currently in use, i.e., it is currently inactive, but some or all of it may be introduced into the upstream direction C1 later.

[0034] As slack is introduced into the cable C from the upstream direction C1, the third clamping element 114C of the cable tensioning system 100 can rotate in a direction corresponding to arrow 122. That is, by passing through the cable C in the downstream direction C2, the cable tensioning system 100 can pick up the slack and dispose of the excess cable C. Similarly, if excess tension is introduced into the cable C along the upstream direction C1, the third clamping element 114C of the cable tensioning system 100 can rotate in a direction corresponding to arrow 120. That is, the cable tensioning system 100 can feed the slack into the upstream direction C1 of the cable C in order to reduce the tension therein. Thus, in one or more embodiments, the cable tensioning system 100 can be configured to maintain the cable tension of the cable C in the upstream direction C1 within a desired range by controlling the direction and / or rotation speed of the clamping element 114C. In some applications, downstream tension monitoring and / or maintenance of the cable C may not be required. However, in some applications, the downstream tension may be monitored and compensated in a manner similar to that described above. It should be understood that in other embodiments, the references to the upstream and downstream sides of the cable C may be reversed. For example, in some embodiments, instead of maintaining tension in the cable C in the upstream direction C1, or in addition to maintaining tension in the cable C in the upstream direction C1, maintaining tension in the cable C may include monitoring and maintaining tension in the cable C in the downstream direction C2.

[0035] Sensors may be employed to monitor the relative balance of the cable tensioning system 100. The sensors may be arranged along (e.g., on) the cable tensioning system 100. The sensors may be configured to sense changes in the balance of the body 102 about the balance point 104. By way of non-limiting example, the sensors may include accelerometers, angular position detectors, and the like. As the body 102 rotates about the balance point 104, the sensors may detect the relative angular displacement of the cable tensioning system 100. The sensors may communicate with a logic element that is configured to receive the sensed angular displacement of the body 102 and provide corrective instructions to maintain the balance of the body 102 about the balance point 104 within a target range. The logic element may convert the voltage into a signal (e.g., a signal that includes information such as the direction and rate of rotation), which the stepper motor 116 may interpret when controlling the aforementioned clamping element 114. In some instances, the logic element may be part of the cable tensioning system 100, i.e., integrated therewith. In other embodiments, the logic element may be part of a discrete component separate from the cable tensioning system 100. Corrective instructions provided by the logic element may be given to the motor 116 to rotate the third clamping element 114C as necessary. Feedback logic may be implemented to prevent sudden (jerk) application of force, and / or to dampen oscillatory motion within the cable C. In an embodiment, feedback control may be used to maintain the posture of the tensioner, such as, for example, linear control (P, PI, PD, PID), switch control, phase lag, phase lead, phase lead-lag, LQR, H2, Hinfinity, etc. It should be understood that the feedback control method is not intended to be limited to the above examples. An on / off button 124 may be used to power on the cable tensioning system 100. The on / off button 124 may include an indication of the state of the cable tensioning system 100 - i.e., on, off, leveling, active control, etc.

[0036] Figure 4 1 shows an embodiment of a cable tensioning system 100 according to another embodiment. Figure 3 The cable receiving area 112 may have a different geometry compared to the cable tensioning system 100 depicted in FIG. Figure 4 The cable tensioning system 100 depicted in FIG. 1 can utilize, for example, linear displacement and detection of the linear displacement to sense and control tension within the cable C. In particular, Figure 4The illustrated embodiment may employ a meter, such as a displacement meter 136, to measure the tension in the cable C. In one embodiment, the displacement meter 136 may include a linear potentiometer, a linear encoder, etc. configured to measure the tension in the cable C. The displacement meter 136 may measure the tension in real time. Using a control loop, the cable tensioning system 100 or a logic device in communication therewith may compare the measured cable tension to a target cable tension and thereby drive the clamping element to maintain or achieve the desired tension. The target tension may be user-introduced. For example, an operator may use a user interface (not shown) associated with the cable tensioning system 100 to adjust the target tension.

[0037] The travel element 138 may be displaceable relative to the fixed portion 140 of the cable tensioning system 100 in a direction along the axis 142. An element, such as an idler pulley 144, may permit the travel element 138 to move relative to the fixed portion 140 with minimal resistance on the cable C. In certain instances, the calibration system may control the introduction of resistance at one or more of the elements of the cable tensioning system, such as at the idler pulley 144, the clamping element 114, etc. In an embodiment, a biasing element, such as a spring 146, may extend between the fixed portion 140 and the travel element 138 and bias the fixed portion 140 and the travel element 138 relative to each other. In the exemplary embodiment depicted, the spring 146 may operate in a compressed state to bias the fixed portion 140 and the travel element 138 away from each other. The spring rate of the spring 146 is known and is used to adjust the tension in the cable tensioning system in response to changes in displacement measured by the displacement meter 136. The cable tensioning system 100 may include upper and lower clamping elements, such as an idle clamping member 148 and a lower clamping member 150. The particular arrangement of the clamping members may vary without departing from the scope of the present disclosure. For example, the idle clamping member 148 may include a plurality of idle or driven clamping members, and the lower clamping member 150 may include a single idle or driven clamping member. In the illustrated embodiment, at least one of the lower clamping members 150 is driven, for example, by the aforementioned motor 116 ( Figure 2 ) is driven.

[0038] similar Figure 4 The cable tensioning system 100 of the embodiment depicted in can exhibit very low inertia, facilitating high bandwidth performance. The cable tensioning system 100 according to the embodiment described herein can maintain cable tension when faced with impulse disturbances (e.g., peaks in loading along cable C) and reduce feedback loop overcompensation. That is, the cable tensioning system 100 can exhibit an enhanced damping effect on changes in cable tension caused by rapid changes in force (acceleration and jerk) along cable C. Figure 4In the embodiment illustrated in FIG. 1 , the balance point of the cable tensioning system 100 can be defined at least in part by any one or more of the spring 146, the displacement meter 136, the travel element 138, a variable mount (not shown) by which the travel element 138 is coupled to a fixed portion, and the like. For example, the balance point can refer to a state of equilibrium in which, e.g., the displacement meter 136 is displaced by a desired amount to indicate proper (i.e., balanced) cable tension. This can include a preload on the spring 146. When such equilibrium is achieved, no adjustment by the driven clamping member 150 is required. That is, the driven clamping member 150 can apply a bias to the cable C that does not increase or decrease, e.g., as long as the displacement meter 136 remains within its target range.

[0039] It should be understood that Figure 3 and Figure 4 The embodiment illustrated in is exemplary only. Other arrangements of the clamping members and idler pulleys, gauges, travel elements, etc. are possible. Figure 3 In the embodiment illustrated in , the cable tensioning system 100 moves, e.g., rotates, to compensate for changing cable tension, e.g., instantaneous changes in cable tension. That is, for example, the cable tensioning system 100 can apply a torque of the cable tensioning system 100 or a portion thereof to set a desired tension or range of tensions maintained in the cable C. Figure 4 In the embodiment illustrated in FIG. 1 , the cable tensioning system 100 utilizes internal movement and / or sensing to compensate for varying cable tension. In this regard, Figure 4 The cable tensioning system 100 can remain stationary relative to the environment. Thus, the entry and exit points of the cable C to the cable tensioning system 100 can be maintained at a fixed position, fixed angle, etc. Figure 3 and Figure 4 The embodiments can all use the balance point described in this article to set the ideal tension parameters of the cable C, and affect the displacement of one or more components of the cable tensioning system 100 (such as the clamping element 114) so ​​as to maintain or keep the ideal tension parameters within a range corresponding to its acceptable deviation.

[0040] Figure 5A perspective front view of a cable tensioning system 100 according to an embodiment is illustrated. The body 102 is shown in an open configuration, i.e., the front face (cover) 107 is in an open position to reveal the cable receiving area 112. The front face 107 may include features, such as slots 107A and 107B, that permit cables to exit the cable receiving area 112 when the front face 107 is closed. The slots 107A and 107B may include an entry for receiving a cable and an extended slot through which the cable may move during a tensioning operation. The slots 107A and 107B may be oriented so that the cable does not rub against the front face 107, or rubs against the front face 107 to a minimum. In the illustrated embodiment, the slots 107A and 107B define a length that is parallel to the axis of rotation of the body 102 of the cable tensioning system 100 about the balance point 104. In this manner, the cable minimally rubs or is prevented from contacting the body 102. This may reduce frictional interference with the balance of body 102, thereby increasing cable tensioning accuracy.

[0041] like Figure 5 , at least one of the clamping elements 114 may include a roller defining a channel 115 configured to receive a cable. The channel 115 may extend around the circumference of the clamping element 114. In certain embodiments, the channel 115 may extend around the entire circumference of at least one of the clamping elements 114. An operator may install a cable into the channel 115 and close the clamping elements 114 before balancing the cable tensioning system 100, as described below.

[0042] In one embodiment, at least one of the clamping elements 114 may be movable between an engaged configuration (e.g., wherein at least one clamping element 114 is engaged with the cable) and a disengaged configuration (e.g., wherein at least one clamping element 114 is not engaged with the cable). Figure 3 In FIG. 1 , the clamping element 114 is depicted as being in an engaged configuration. In contrast, in Figure 5 , the first clamping element 114A and the second clamping element 114B are depicted as being in a disengaged configuration. In a particular embodiment, the first clamping element 114A and the second clamping element 114B may be translatable between an engaged configuration and a disengaged configuration. In yet another particular embodiment, the first clamping element 114A and the second clamping element 114B may translate and rotate / pivot between an engaged configuration and a disengaged configuration.

[0043] The engagement mechanism 117 (e.g., a clamp) can be used to selectively maintain the first clamping element 114A and the second clamping element 114B in an engaged configuration. In the illustrated embodiment, the engagement mechanism 117 includes a selectively movable bar extending between the first clamping element 114A and the second clamping element 114B. The engagement mechanism 117 is shown as being separated from the first clamping element 114A (i.e., in a disengaged configuration), allowing the first clamping element 114A and the second clamping element 114B to be displaced relative to each other for receiving a cable. After the cable is installed in the cable receiving area 112, the operator can selectively move the engagement mechanism 117 so as to fix the first clamping element 114A and the second clamping element 114B together in the engaged configuration. Figure 5 The engagement mechanism 117 depicted in the drawings is exemplary only. In other embodiments, the engagement mechanism 117 may include a motor, a spring biasing element, a gear interface, another engagement mechanism, a linear or pivoting mechanism, or any combination thereof configured to drive at least one of the first clamping element 114A and the second clamping element 114B together.

[0044] After the cable is seated in the cable receiving area 112, the front face 107 can be closed for the duration of the tensioner operation. The closed front face 107 can prevent debris from entering the cable receiving area 112 and prevent the cable from accidentally becoming detached from the cable tensioning device 100. Additionally, the front face 107 can prevent fingers or the like from accidentally being pinched between the clamping elements 114.

[0045] The cable tensioning system 100 can be used to maintain a constant or substantially constant tension in the cable C. Using active balance compensation, as defined by continuous sensing and correction of unstable (unbalanced) forces, the cable tensioning system 100 can be configured to maintain the desired tension within a tolerance of less than 100N, such as less than 50N, such as less than 25N, such as less than 20N, such as less than 15N, such as less than 10N, such as less than 9N, such as less than 8N, such as less than 7N, such as less than 6N, such as less than 5N, such as less than 4N, such as less than 3N, such as less than 2N, such as less than 1N. In some examples, the cable tensioning system 100 can be configured to maintain the desired tension within a tolerance of less than 0.9N, such as less than 0.8N, such as less than 0.7N, such as less than 0.6N, such as less than 0.5N, such as less than 0.4N, such as less than 0.3N, such as less than 0.2N, such as less than 0.1N, such as less than 0.05N, such as less than 0.01N. In some examples, the cable tensioning system 100 can maintain the tension of the cable C within a desired tolerance while the cable C is variably tensioned, such as by moving a tool on the cable C or one end thereof. Figure 6In certain service operations, a tool T is connected to a cable C that is passing through a cable receiving area 112. For example, as the tool T moves, the tension in the cable C may vary. For example, as the tool T moves away from the cable receiving area 112, the tension in the cable C may increase. Conversely, as the tool T moves toward the cable receiving area 112, the tension in the cable C may decrease. This may be problematic for a tool T that relies on a constant application of tension. To counteract such increases and decreases in tension, the cable tensioning system 100 may utilize its relative position relative to its balance point 104 to maintain the cable C at a constant or substantially constant tension, as measured between the cable tensioning system 100 and the tool T. Excess cable C may be spooled, laid, hung, or otherwise stored for use.

[0046] Figure 7 A simplified schematic diagram of the cable tensioning system 100 performing rotational movement in response to a varying load from the cable C is shown. Without checking, the cable tensioning system 100 rotates in response to the varying tension in the cable C. That is, if the clamping element 114 in the cable receiving area 112 is fixedly secured to the cable C without an opportunity to correct for the rotational movement caused by the cable C, the cable tensioning system 100 may rotate. For example, as the cable tension increases in the upward direction, the cable tensioning system 100 may rotate counterclockwise (e.g., Figure 7 Similarly, as the cable tension decreases in the upward direction, the cable tensioning system 100 may rotate in a clockwise direction (e.g. Figure 7 To control (ie, minimize) the movement of the cable tensioning system 100 and maintain it in the solid line (centered position), the motor 116 can adjust the force provided to the aforementioned third clamping element 114C, as described above.

[0047] The balanced loading characteristics exhibited by the cable tensioning system 100 may depend on the geometry of the cable tensioning system 100 and / or the specific weight and loading characteristics applied thereto. Figure 7 1. The embodiment depicted in FIG. 1 illustrates a cable tensioning system 100 divided into a first side 128 and a second side 130. The first side 128 and the second side 130 may be divided by a centerline 132 that intersects the balance point 104. As illustrated, a cable receiving area is disposed on the first side 128 of the cable tensioning system 100, and a counterweight 134 is disposed on the second side 130 of the cable tensioning system 100. In certain embodiments, the counterweight 134 and the logic element 126 may be part of the same system. The cable tensioning system 100 may be adjusted, such as fine-tuned, by varying the properties of the counterweight 134. For example, as the mass of the counterweight 134 decreases or moves inward, the upstream loading (at the position of the cable C) of the cable C necessary to rotate the cable tensioning system 100 may be reduced. Figure 7, pulling the cable upward (C) decreases. Thus, when it is required to maintain a relatively small tension, the counterweight 134 can have a smaller mass. Conversely, when a large tension is required, the counterweight 134 can have a larger mass. In another embodiment, the relative balance of the cable tensioning system 100 can be adjusted by moving the counterweight 134, the clamping element 114, another element, or any combination thereof relative to the centerline 132. For example, as the cable receiving area 112 moves away from the centerline 132, the downward force of the counterweight 134 necessary to maintain balance can increase. By varying one or more aspects of the geometric configuration of the cable tensioning system 100, an operator can select an appropriate tension to be applied to the cable. In this regard, the cable tensioning system 100 can be adjustable, i.e., configured to be adjusted based on the desired tension in each specific cable tensioning application.

[0048] Reference again Figure 3 In one embodiment, the counterweight 134 may be adjustable. That is, for example, the counterweight 134 may be movable within a range of positions along the path 154 in a direction corresponding to the arrow 152. As the counterweight 134 moves away from the cable receiving area 112, the tension in the cable C may decrease. Conversely, as the counterweight 134 moves toward the cable receiving area 112, the tension in the cable C may increase. This is an exemplary manner of controlling the target cable tension. It should be understood that the counterweight 134 and / or the path 154 may be arranged at another position relative to the cable tensioning system 100. For example, alternatively, the path 154 may be arranged near the cable receiving area 112. In this regard, the tension may be increased by moving the counterweight 134 away from the cable receiving area 112, and may be decreased by moving the counterweight 134 toward the cable receiving area 112. In other exemplary embodiments, the counterweight 134 may have different positions, angular orientations, etc.

[0049] Figure 8 A flow chart of a method 800 for maintaining tension in a cable is illustrated. The method 800 includes step 802 of inserting a cable into a cable receiving area of ​​a cable tensioning system. The cable receiving area includes a plurality of clamping elements, such as those clamping elements 114 described herein. The cable can be inserted into the cable receiving area by translating the cable toward the cable receiving area in a transverse direction relative to its longitudinal axis. That is, the cable does not need to be threaded through the clamping elements. Thus, the cable tensioning system can be used in many environments throughout a variety of workflows where the longitudinal ends of the cable are not readily available or necessary.

[0050] In some instances, method 800 further includes balancing the cable tensioning system about the balance point. For example, this may include referencing a balance of the cable tensioning system and setting a desired tension of the cable relative to the referenced balance of the cable tensioning system. In some instances, this may include automatic adjustment of a counterweight, a spatial geometry of the cable tensioning system, a resistance to rotation at the balance point, a braking system, etc. In one embodiment, balancing the cable tensioning system may occur after step 802 of inserting the cable into the cable receiving area. In another embodiment, balancing the cable tensioning system may occur before step 802 of inserting the cable into the receiving area. In yet another embodiment, balancing the cable tensioning system and inserting the cable into the cable receiving area at step 802 may be performed at or approximately at the same time as each other.

[0051] The method 800 further includes a step 804 of sensing a change in balance of the cable tensioning system about a balance point. Step 804 may be performed by an integrated sensor, an external sensor, or a combination thereof. The sensed change in balance may then be analyzed by a logic device to determine a corrective instruction to balance the cable tensioning device. The method 800 may further include a step 806 of automatically adjusting a relative position of the clamping element relative to the cable in response to the sensed change in balance, i.e., in response to the corrective instruction. The step 806 of automatically adjusting the relative position of the clamping element may maintain a desired tension in the cable by pulling and releasing the cable as necessary.

[0052] Embodiments of the cable tensioning systems described herein can utilize movement (e.g., rotational movement) of the cable tensioning system to balance and maintain tension within a cable used with a tool during operation. The cable tensioning system can be adjustable so that the tension within the cable can be controlled and set to a specified load rating and / or tolerance variable. That is, an operator can select a desired tension within the cable and / or a tolerance range in the cable, i.e., the outer limits of acceptable tension.

[0053] This written description uses examples to disclose the invention, including the best mode, and also to enable those skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements that do not differ substantially from the literal language of the claims.

[0054] Further aspects of the invention are provided by the subject matter of the following clauses:

[0055] Embodiment 1. A cable tensioning system comprises: a body defining a balance point; a cable receiving area having a clamping element configured to clamp and bias a cable relative to the cable tensioning system; and a sensor configured to sense changes in the balance of the body about the balance point, wherein the cable tensioning system is configured to maintain the cable within a preset range of tension.

[0056] Embodiment 2. The cable tensioning system of any one or more of the embodiments, further comprising a motor configured to control the rotation direction and rate of the clamping element.

[0057] Embodiment 3. The cable tensioning system as described in any one or more of the embodiments, further comprising a counterweight configured to offset a balance point of the cable tensioning system.

[0058] Embodiment 4. The cable tensioning system of any one or more of the embodiments, wherein the clamping element comprises a plurality of rollers, and wherein at least one of the rollers is driven by a motor.

[0059] Embodiment 5. A cable tensioning system as described in any one or more of the embodiments, wherein the balance point includes a pivot axis and the body is configured to pivot about the pivot axis.

[0060] Embodiment 6. A cable tensioning system as described in any one or more of the embodiments, wherein the cable tensioning system further comprises a displacement meter configured to measure the relative displacement of a traveling element of the cable tensioning system in response to a varying cable tension, and to adjust the tension of the cable in response to the measured displacement.

[0061] Embodiment 7. The cable tensioning system as recited in any one or more of the embodiments, wherein the cable tensioning system is configured to be installed at a location associated with a gas turbine engine.

[0062] Embodiment 8. A cable tensioning system, comprising: a body, defining a balance point; a plurality of clamping elements, configured to clamp and bias a cable relative to the cable tensioning system; an adjustable counterweight; a sensor, configured to sense changing tension of the cable; a logic element, configured to receive the sensed changes in tension of the cable and provide correction instructions to maintain the cable within a preset range of tension; and a motor, connected to at least one of the clamping elements and configured to rotatably control the at least one clamping element in response to the correction instructions from the logic element, wherein the preset range of tension can be adjusted using the adjustable counterweight.

[0063] Embodiment 9. The cable tensioning system of any one or more of the embodiments, wherein the plurality of clamping elements are adjustable to accommodate cables having different diameters.

[0064] Embodiment 10. The cable tensioning system of any one or more of the embodiments, further comprising a connector coupled to the body, the connector extending from the body and configured to engage with a complementary connector of another object at a location associated with the cable.

[0065] Embodiment 11. A cable tensioning system as described in any one or more of the embodiments, wherein the cable tensioning system is configured to be coupled to a gas turbine engine using a mount, the mount being configured to adjustably set at least one of a position and an angle of the cable relative to the cable tensioning system.

[0066] Embodiment 12. A cable tensioning system as described in any one or more of the embodiments, wherein the balance point comprises a pivot axis about which the body is pivotably mounted.

[0067] Embodiment 13. A method for maintaining tension in a cable, the method comprising: inserting the cable into a cable receiving area of ​​a cable tensioning system, the cable receiving area comprising a plurality of clamping elements; sensing a change in balance of the cable tensioning system around a balance point of the cable tensioning system; and biasing the clamping elements relative to the cable in response to the sensed balance change.

[0068] Embodiment 14. A method as described in any one or more of the embodiments, wherein the balance point includes a pivot axis and the body is configured to pivot about the pivot axis.

[0069] Embodiment 15. The method of any one or more of the embodiments, wherein the plurality of clamping elements comprise rollers, and wherein biasing the clamping elements comprises automatically driving at least one of the rollers with a motor.

[0070] Embodiment 16. The method as recited in any one or more of the embodiments, wherein actuating at least one roller increases or decreases tension in the cable.

[0071] Embodiment 17. The method as recited in any one or more of the embodiments, further comprising installing the cable tensioning system at a location associated with the gas turbine engine.

[0072] Embodiment 18. The method as recited in any one or more of the embodiments, wherein installing the cable tensioning system is performed by coupling the cable tensioning system to a mount, the mount coupled to the gas turbine engine.

[0073] Embodiment 19. The method as described in any one or more of the embodiments further comprises calibrating the cable tensioning system by: referring to the relative balance of the cable tensioning system; and setting the desired tension of the cable relative to the balance of the referenced cable tensioning system.

[0074] Embodiment 20. The method as described in any one or more embodiments of the embodiments further includes adjusting the tension of the cable by adjusting the balance angle of the cable tensioning system around the balance point, changing the offset distance between the cable receiving area and the balance point, adjusting the counterweight of the cable tensioning system, adjusting the spring characteristics or any combination thereof.

Claims

1. A cable tensioning system, characterized in that: Include: a body defining a balance point; wherein the body includes a cable receiving area having a clamping element configured to clamp and bias a cable relative to the cable tensioning system, wherein the clamping element includes a plurality of rollers; and wherein the balance point comprises a pivot axis about which the body is configured to pivot; a sensor configured to sense a change in the balance of the body about the balance point, The cable tensioning system is configured to maintain the cable within a preset range of tension by driving at least one roller of the plurality of rollers of the clamping element.

2. The cable tensioning system according to claim 1, characterized in that: Further included is a motor configured to control the direction and rate of rotation of the gripping element.

3. The cable tensioning system according to claim 1, characterized in that: Further included is a counterweight configured to adjust the balance point of the cable tensioning system.

4. The cable tensioning system according to claim 1, characterized in that: And wherein said at least one of said rollers is driven by a motor.

5. The cable tensioning system according to claim 1, characterized in that: The clamping element includes a first passive clamping element, a second passive clamping element and a third driven clamping element, wherein a portion of the third driven clamping element and a portion of the cable contacting the portion of the third driven clamping element are arranged between the first passive clamping element and the second passive clamping element.

6. The cable tensioning system according to claim 1, characterized in that: Wherein the cable tensioning system is configured to be installed at a location associated with a gas turbine engine.

7. A cable tensioning system, characterized in that: Include: a body defining a balance point; wherein the body includes a plurality of clamping elements configured to clamp and bias a cable relative to the cable tensioning system, wherein the plurality of clamping elements include rollers; and wherein the balance point comprises a pivot axis about which the body is configured to pivot; Adjustable counterweight; a sensor configured to sense a change in balance of the body about the balance point; a logic element configured to receive sensed changes in the balance of the body about the balance point and provide corrective instructions to maintain the cable within a preset range of tension; as well as a motor coupled to at least one of the plurality of gripping elements and configured to rotatably control the at least one gripping element in response to the correction command from the logic element, The preset range of the tension can be adjusted using the adjustable weight.

8. The cable tensioning system according to claim 7, characterized in that: The plurality of clamping elements are adjustable to accommodate cables with different diameters.

9. The cable tensioning system according to claim 7, characterized in that: Further included is a coupling coupled to the body, the coupling extending from the body and configured to engage a complementary coupling of another object at a location associated with the cable.

10. The cable tensioning system according to claim 7, characterized in that: Wherein the cable tensioning system is configured to be coupled to a gas turbine engine using a mount configured to adjustably set at least one of a position and an angle of the cable relative to the cable tensioning system.

11. The cable tensioning system according to claim 7, characterized in that: The plurality of clamping elements include a first passive clamping element, a second passive clamping element and a third driven clamping element, wherein a portion of the third driven clamping element and a portion of the cable contacting the portion of the third driven clamping element are disposed between the first passive clamping element and the second passive clamping element.

12. A method for maintaining tension in a cable, characterized in that: The method comprises: inserting the cable into a cable receiving area of ​​a cable tensioning system, a body including the cable receiving area, the body defining a balance point, the balance point including a pivot axis, the body being configured to pivot about the pivot axis, the cable receiving area including a plurality of clamping elements, wherein the plurality of clamping elements include rollers; sensing a change in balance of the body of the cable tensioning system about the balance point of the body of the cable tensioning system; as well as responsive to the sensed change in balance, biasing the plurality of clamping elements relative to the cable, Wherein biasing the plurality of clamping elements comprises driving at least one of the rollers of the plurality of clamping elements.

13. The method according to claim 12, characterized in that Wherein biasing the plurality of clamping elements comprises automatically driving the at least one of the rollers with a motor.

14. The method according to claim 13, characterized in that Wherein driving the at least one roller increases or decreases tension in the cable.

15. The method according to claim 12, characterized in that Further included is installing the cable tensioning system at a location associated with a gas turbine engine.

16. The method according to claim 15, characterized in that Wherein installing the cable tensioning system is performed by coupling the cable tensioning system to a mount, the mount being coupled to the gas turbine engine.

17. The method according to claim 12, characterized in that Further comprising calibrating the cable tensioning system by: reference to the relative balance of the body of the cable tensioning system; and A desired tension in the cable is set relative to a referenced balance of the body of the cable tensioning system.

18. The method according to claim 12, characterized in that Further comprising adjusting the tension of the cable by at least one of: adjusting a balance angle of the cable tensioning system about the balance point of the body, varying an offset distance between the cable receiving area and the balance point of the body, adjusting a counterweight of the cable tensioning system, adjusting a spring characteristic, or any combination thereof.

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