Insertion tool

Abstract

A tool system for inserting a cavity, the tool system comprising a first continuum having a flexible body defining a connection interface; a second continuum having a flexible body defining a connection interface; and a coupling mechanism constructed to couple the connection interfaces of the first and second continuums together to form a tool.

Description

Technical Field

[0001] The present subject matter generally relates to a tool for inspecting an environment and / or performing maintenance operations on components within the environment, such as within an annulus in a turbine engine. Background Art

[0002] At least some gas turbine engines include, in a series arrangement, a compressor section including a low-pressure compressor and a high-pressure compressor for compressing air flowing through the engine, a combustor for mixing fuel with the compressed air so that the mixture can be ignited, and a turbine section including a high-pressure turbine and a low-pressure turbine for providing power to the compressor section.

[0003] At least some gas turbine engines define annular openings within one or more sections. Some of these annular openings may vary in size and shape, such that each annular opening must use a dedicated, specialized insertion tool in order to extend around and through such annular opening. The aviation service industry is continually demanding improved insertion tools to increase versatility and reduce the number of individual parts required in the field during maintenance operations. 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 tool system for inserting a cavity includes: a first continuum having a flexible body defining a first connection interface; a second continuum having a flexible body defining a second connection interface; and a coupling mechanism constructed to connect the first and second connection interfaces of the first and second continuums together to form a tool.

[0006] According to another exemplary embodiment, a tool for insertion into a cavity of an aircraft engine includes: a flexible first continuum; and a flexible second continuum, wherein the first and second continuums are selectively engageable with each other, and wherein when selectively engaged, the first and second continuums have a substantially rigid configuration.

[0007] According to another exemplary embodiment, a method of inserting a tool into a cavity includes: passing a first continuum through a coupling mechanism; passing a second continuum through the coupling mechanism; and coupling the first continuum and the second continuum together using the coupling mechanism to form a tool, wherein a shape of the formed tool is defined by a shape of the coupling mechanism.

[0008] These and other features, aspects and advantages of the present invention will be 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 present invention and, together with the description, serve to explain the principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0010] Figure 1 is a schematic cross-sectional view of a gas turbine engine according to an exemplary aspect of the present disclosure.

[0011] Figure 2 yes Figure 1 Close-up cross-sectional views of a combustion section of an exemplary gas turbine engine along axial and radial directions including an insertion tool according to an exemplary embodiment of the present disclosure.

[0012] Figure 3 yes Figure 1 Another close-up cross-sectional view of a combustion section of an exemplary gas turbine engine along axial and radial directions including an exemplary insertion tool.

[0013] Figure 4 is a perspective view of an insertion tool according to an exemplary embodiment of the present disclosure.

[0014] Figure 5 is a cross-sectional side view of a first continuum and a second continuum of an insertion tool according to an exemplary embodiment of the present disclosure, as shown along Figure 4 As seen by line AA in .

[0015] Figure 6 According to an exemplary embodiment of the present disclosure Figure 5 A cross-sectional view of the first continuum and the second continuum of the insertion tool, as seen along line BB.

[0016] Figure 7 According to an exemplary embodiment of the present disclosure Figure 5 A cross-sectional view of the first continuum and the second continuum of the insertion tool, as seen along line CC.

[0017] Figure 8 According to an exemplary embodiment of the present disclosure Figure 5 Front view of the first continuum of insertion tools, as seen along line DD.

[0018] Fig. 9 is a schematic diagram of a system including an exemplary insertion tool according to an exemplary embodiment of the present disclosure.

[0019] Fig.10 is a cross-sectional view of an insertion tool according to an exemplary embodiment of the present disclosure.

[0020] Fig.11 is a flow chart of a method of inserting a tool into a cavity according to an exemplary embodiment of the present disclosure.

[0021] Fig.12 is a flow chart of a method of inserting a tool into a cavity according to an exemplary embodiment of the present disclosure.

[0022] Fig.13 is a perspective view of a continuum of an insertion tool according to another exemplary embodiment of the present disclosure.

[0023] Fig.14 is a perspective view of a continuum of an insertion tool according to another exemplary embodiment of the present disclosure.

[0024] Repeat use of reference characters in the present specification and drawings is intended to represent the same or analogous features or elements of the present invention. DETAILED DESCRIPTION

[0025] Reference will now be made in detail to the present embodiments of the present invention, one or more examples of which are shown in the accompanying drawings. The detailed description uses numerical and letter references to refer to the features in the drawings. The same or similar reference numerals in the drawings and description have been used to refer to the same or similar parts of the present invention.

[0026] 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. Moreover, each example is provided for the purpose of explaining the invention, not limiting the invention. In fact, it will be apparent to those skilled in the art that various modifications and changes may be made to the invention without departing from the scope of the invention. For example, features shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the invention is intended to cover such modifications and changes as come within the scope of the appended claims and their equivalents.

[0027] 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 position or importance of the respective components. Unless the context clearly dictates otherwise, the singular forms "a," "an," and "the" include plural references. Unless otherwise specified, the terms "coupled," "fixed," "attached," and the like refer to both direct coupling, fixing, or attachment and indirect coupling, fixing, or attachment through one or more intermediate components or features.

[0028] The terms "forward" and "rearward" 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, for a gas turbine engine, the forward position refers to a position near the engine air intake, and the rearward position refers to a position near the engine nozzle or exhaust. The terms "upstream" and "downstream" refer to relative directions relative to the flow of a fluid in a fluid passage. For example, "upstream" refers to the direction from which the fluid is flowing, and "downstream" refers to the direction to which the fluid is flowing.

[0029] Approximate language, as used herein throughout the specification and claims, is used to modify any quantitative representation that may be permissibly varied without resulting in a change in the basic function to which it is related. Thus, values ​​modified by one or more terms, such as "about," "approximately," and "substantially," are not limited to the precise values ​​specified. In at least some cases, approximate language may correspond to the precision of an instrument used to measure a value, or the precision of a method or machine used to construct or manufacture a component and / or system. For example, approximate language may mean within a 10% margin.

[0030] Here and throughout the specification and claims, range limitations are combined and interchanged, and unless context or language indicates otherwise, such ranges are identified and include all sub-ranges contained therein. For example, all ranges disclosed herein include the endpoints, and the endpoints are independently combinable with each other.

[0031] Generally speaking, an insertion tool according to one or more embodiments described herein may be configured to allow an operator or a robotic assembly to inspect a cavity, such as the internal volume of a gas turbine engine. The insertion tool may generally include a first and a second flexible continuum that, when combined, form a substantially rigid structure having a geometry that is selectively arranged in view of the cavity to be inserted. Each flexible continuum may define half of the tool, as seen in a rigid configuration. In some cases, the insertion tool may be fed into the cavity while being formed by one or more drive or engagement elements described herein. In one embodiment, the geometry of the rigid structure may be controlled by the engagement element. For example, the engagement element may define a desired shape that may be transferred to the first and second flexible continuums to form the rigid structure. The use of engagement elements of various shapes may allow for selective forming of the rigid structure, taking into account the spatial arrangement of the cavity to be inspected or otherwise operated therein. According to one embodiment, the continuum does not require dimensional accuracy in the longitudinal direction while allowing the insertion tool to bend. As a result, the insertion tool may be easier and cheaper to manufacture while exhibiting a relatively extended operating life. Now referring to the drawings, in which the same numerals represent the same elements throughout the drawings, Figure 1 is a schematic cross-sectional view of a gas turbine engine according to an exemplary embodiment of the present disclosure. More specifically, Figure 1In the embodiment of the present invention, the gas turbine engine is a high bypass turbofan jet engine 10, referred to herein as a "turbofan engine 10". Figure 1 As shown, the turbofan engine 10 defines an axial direction A (extending parallel to a longitudinal centerline 12 provided as a reference) and a radial direction R. The turbofan engine 10 also defines a circumferential direction C (see FIG. 1 ) extending circumferentially about the axial direction A. Figure 3 ). Generally, the turbofan 10 includes a fan section 14 and a turbine 16 disposed downstream of the fan section 14 .

[0032] The depicted exemplary turbine 16 is generally enclosed within a generally tubular casing 18 defining an annular inlet 20 and an annular exhaust 21. The casing 18 surrounds, in series flow relationship, a compressor section including a supercharger or low pressure (LP) compressor 22 and a high pressure (HP) compressor 24; a combustion section 26; a turbine section including a high pressure (HP) turbine 28 and a low pressure (LP) turbine 30; and an ejection exhaust nozzle section 32. A high pressure (HP) shaft or spool 34 drivingly connects the HP turbine 28 to the HP compressor 24. A low pressure (LP) shaft or spool 36 drivingly connects the LP turbine 30 to the LP compressor 22. The compressor section, combustion section 26, turbine section, and nozzle section 32 together define a core air flow path 37 therethrough.

[0033] For the depicted embodiment, the fan section 14 includes a fixed pitch fan 38 having a plurality of fan blades 40. The fan blades 40 are each attached to a disk 42, and the fan blades 40 and disk 42 are rotatable together about the longitudinal axis 12 via the LP shaft 36. For the illustrated embodiment, the turbofan engine 10 is a direct drive turbofan engine, such that the LP shaft 36 directly drives the fan 38 of the fan section 14 without using a reduction gearbox. However, in other exemplary embodiments of the present disclosure, the fan 38 may alternatively be a variable pitch fan, and the turbofan engine 10 may include a reduction gearbox, in which case the LP shaft 36 may drive the fan 38 of the fan section 14 across a gearbox.

[0034] Still refer to Figure 1In the exemplary embodiment of the present invention, the disk 42 is covered by a rotatable front hub 48 having an aerodynamic profile to facilitate airflow through the plurality of fan blades 40. In addition, the exemplary turbofan engine 10 includes an annular nacelle assembly 50 that circumferentially surrounds at least a portion of the fan 38 and / or the turbine 16. For the depicted embodiment, the nacelle assembly 50 is supported relative to the turbine 16 by a plurality of circumferentially spaced outlet guide vanes 52. In addition, a downstream section 54 of the nacelle assembly 50 extends over the exterior of the shell 18 to define a bypass airflow passage 56 therebetween. The ratio between the first portion of air passing through the bypass airflow passage 56 and the second portion of air passing through the inlet 20 of the turbine 16 and through the core air flow path 37 is generally referred to as a bypass ratio.

[0035] It should be understood that although Figure 1 1, but the turbofan engine 10 may further define a plurality of openings to allow inspection of various components within the turbine 16. For example, the turbofan engine 10 may define a plurality of borescope openings at various axial locations within the compressor section, the combustion section 26, and the turbine section. In addition, as will be discussed below, the turbofan engine 10 may include one or more igniter ports located, for example, within the combustion section 26 of the turbine 16, which may allow inspection of the combustion section 26.

[0036] It should be further understood that Figure 1 The exemplary turbofan engine 10 depicted in FIG. 1 is merely an example, and in other exemplary embodiments, the turbofan engine 10 may have any other suitable configuration, including, for example, any other suitable number of shafts or spools, turbines, compressors, etc. Additionally or alternatively, in other exemplary embodiments, any other suitable turbine engine may be provided. For example, in other exemplary embodiments, the turbine engine may not be a turbofan engine, but may be configured as a turboshaft engine, a turboprop engine, a turbojet engine, etc.

[0037] Reference now Figure 2 , Figure 1 A close-up schematic diagram of the combustion section 26 of the turbine 16 of an exemplary gas turbine engine 10 is provided together with a tool 100 for inserting an annular section of the engine 10. It should be understood that although the tool 100 is Figure 2 1 and described below as being inserted into the combustion section 26, but in other exemplary embodiments, the tool 100 may additionally or alternatively be inserted into other areas of the turbofan engine 10 having an annular shape or other shapes. For example, the tool 100 may be inserted into an annular section of a compressor section or a turbine section, or alternatively, into other engines or systems entirely. Additionally or alternatively, the tool 100 may still be inserted into a non-annular section.

[0038] As depicted, the combustion section 26 generally includes a combustor 60 positioned within a combustor casing 62. In addition, the combustor 60 includes an inner liner 64, an outer liner 66, and a dome 68 that together at least partially define a combustion chamber 70. It should be understood that for the depicted embodiment, the dome 68 is an annular dome and the combustor 60 is configured as an annular combustor. In this way, the combustion chamber 70 generally defines an annular shape. At the front end 61, the combustor 60 defines, or more specifically, the dome 68 defines a nozzle opening 72, and the combustion section 26 also includes a fuel-air mixer 74 or nozzle located within the nozzle opening 72. The fuel-air mixer 74 is configured to provide a mixture of fuel and compressed air to the combustion chamber 70 during operation of the turbofan engine 10 to produce combustion gases. The combustion gases flow from the combustion chamber 70 to the HP turbine 28, and more specifically, through a plurality of inlet guide vanes 76 of the HP turbine 28.

[0039] It is worth noting that although Figure 2 Although a single nozzle opening 72 and fuel-air mixer 74 are depicted in FIG. 6 , the combustor 60 may also include a plurality of circumferentially spaced nozzle openings 72 and a corresponding plurality of fuel-air mixers 74 located within the nozzle openings 72 .

[0040] To initiate combustion of the fuel and compressed air provided to the combustion chamber 70 by the fuel-air mixer 74, the combustion section 26 typically includes one or more igniters (not installed or shown) that extend through corresponding igniter openings 78 defined in the combustor casing 62 and the outer liner 66 of the combustor 60. However, when the turbofan engine 10 is not operating, the igniters may be removed and the igniter openings 78 may be utilized to inspect, for example, the combustion chamber 70, the inlet guide vanes 76 of the HP turbine 28, and / or other components.

[0041] More specifically, for Figure 2 In the embodiment of FIG. 1 , a tool 100 capable of being inserted into an annular section of the engine is depicted extending through a pair of igniter openings 78 defined in the combustor casing 62 and the outer liner 66 of the combustor 60 .

[0042] Now also refer to Figure 3 , provides Figure 2 FIG. 1 is a partial axial cross-sectional view of the combustion section 26 of FIG. 1 . It should be understood that the tool 100 generally includes a plurality of continuums, such as a first continuum 102 and a second continuum 104, which can be moved into the combustion chamber 70. The first and second continuums 102 and 104 can be moved along Figure 3 The connection interface 106 can extend continuously along the length of the tool 100. Figure 3As shown, and according to some embodiments, the connection interface 106 may remain in a one-dimensional or two-dimensional spatial arrangement. That is, the connection interface 106 may not twist around the circumference of the tool 100, such as in a spiral, in a third dimension, such as a Cartesian coordinate system.

[0043] In some cases, the tool 100 may define one or more linear portions 108 and one or more curved portions 110. The curved portion 110 may define a radius of curvature, such as R1. The radius of curvature of the curved portion 110 shown may be set within a single plane. That is, for example, as described above, the radius of curvature of the curved portion 110 of the tool 100 may be defined by a single plane.

[0044] The distal end 112 of the tool 100 may include an instrument, which for the depicted embodiment is a camera 114, to allow inspection of various components of the combustor 60 and / or the high pressure turbine 28. It should be understood, however, that the insertion tool 100 may include any other suitable instrument, such that the insertion tool 100 may be used for any suitable purpose. For example, the insertion tool 100 may be used to inspect the interior of an engine using, for example, the camera 114. Additionally or alternatively, the insertion tool 100 may include various other tools and instruments to perform one or more maintenance operations (e.g., drilling, welding, heating, cooling, cleaning, spraying, etc.) inside the engine.

[0045] In addition, the exemplary insertion tool 100 may include a drive assembly 116 for driving the insertion tool 100 into or out of the interior of the engine, and more specifically, for the illustrated embodiment, into or out of the combustion chamber 70. The drive assembly 116 may be operably coupled to a controller or other control device so that the length of the insertion tool 100 within the engine may be relatively precisely controlled by the drive assembly 116.

[0046] In one embodiment, the drive assembly 116 may include a coupling mechanism 118 configured to connect the first and second continuums 102 and 104 together to form the tool 100. In another embodiment, the coupling mechanism 118 and the drive assembly 116 may be discrete, for example, separate components. For example, the coupling mechanism 118 may be separated from the drive assembly 116 so that the drive assembly 116 only engages with the individual first and second continuums 102 and 104. The coupling mechanism 118 may be used to selectively connect the first and second continuums 102 and 104 together to form the tool 100. In some cases, the coupling mechanism 118 may define one or more selected shapes that may be transferred to the tool 100 during the step of connecting the first and second continuums 102 and 104 together. In this manner, the coupling mechanism 118 may be interchangeable, for example, to allow an operator to adjust the shape of the resulting tool 100. In one embodiment, the coupling mechanism 118 may be selected from a plurality of different coupling mechanisms, at least two of which have different shapes compared to each other. The operator may select a coupling mechanism of an appropriate shape from the plurality of different coupling mechanisms based on the engine being repaired.

[0047] In one embodiment, the engagement mechanism 118 may be a variable shape engagement mechanism. In this manner, the operator may selectively shape the engagement mechanism 118 to achieve a desired shape of the final tool 100. For example, the variable shape engagement mechanism may include an actuated flexible or articulated section that allows the operator to select a desired curved shape and size for the environment in which it is operating.

[0048] Figure 4 A perspective view of a tool 100 according to an exemplary embodiment is shown during a process of connecting a first continuum 102 and a second continuum 104 together to form a substantially rigid structure for performing service, such as inspection and / or operation in a cavity of a device, such as an aircraft engine. At this point, the shape of the upper portion of the tool 100 is not yet defined, while the lower portion of the tool 100 includes the interconnected first and second continuums 102 and 104, thereby defining the shape of the lower portion of the tool 100.

[0049] Figure 5 Shown along Figure 4 1 and 12. A cross-sectional side view of a first continuous body 102 and a second continuous body 104 of an insertion tool 100 according to an exemplary embodiment of the present disclosure as viewed along line AA in FIG. The tool 100 is generally advanced in a direction D into or away from an area of ​​interest, such as an inspection area of ​​an engine. As shown, the first and second continuous bodies 102 and 104 are separated at a first position 120 and engaged at a point 122 (e.g., the engagement mechanism 118 ( Figure 3) are connected together at a location where the first continuum 102 and the second continuum 104 are located) to form the tool 100. In some cases, the meshing point 122 may include one or more coupling forces (e.g., an internal force F transverse to the longitudinal length of the first continuum 102 and the second continuum 104) applied to an area of ​​the first continuum 102 and the second continuum 104. In one embodiment, the coupling force can be generated, for example, at discrete locations within the meshing point 122. In another embodiment, the coupling force can be generated at multiple locations within the meshing point 122 or along a continuous length of the meshing point 122. That is, for example, the force F can be generated by an inclined interface that gradually reduces the distance between the first continuum 102 and the second continuum 104. The meshing point 122 can transition the first continuum 102 and the second continuum 104 from a separated (i.e., disconnected) configuration to an attached configuration to form the tool 100.

[0050] like Figure 5 As shown, the distal end 112 of the tool 100 can be at least partially formed by the first and second continuums 102 and 104. For example, the first and second continuums 102 and 104 can be aligned such that half of the distal end 112 is defined by the first continuum 102 and the other half of the distal end 112 is defined by the second continuum 104. In this manner, the respective distal ends 112A and 112B of the first continuum 102 and the second continuum 104 can be coplanar. As a result, including one or more curved portions, such as the curved portion 110, can cause the relative lengths of the first continuum 102 and the second continuum 104 that actively form a portion of the rigid portion of the tool 100 to be different from each other. As used herein, the active portion of the tool 100 may refer to those portions of the first continuum 102 and the second continuum 104 of the tool 100 that are coupled together to form a substantially rigid tool. Conversely, the inactive portion of the tool 100 may refer to those portions of the first continuum 102 and the second continuum 104 that are not coupled together. As Figure 5 As shown, because the second continuum 104 is located on the side of the tool 100 radially inward of the first continuum 102, the second continuum 104 has a shorter distance to travel around the curved portion 110. Therefore, more of the first continuum 102 is required to maintain the tool 100 having the curved portion 110. Conversely, introducing a second curved portion (not shown) having an equal but opposite radius of curvature to the curved portion 110 (e.g., an S-shaped curve formed by equal curvature radii) in the tool 100 can cause the effective lengths of the first continuum 102 and the second continuum 104 to be equal when measured upstream of the second curved portion.

[0051] After passing through the engagement point 122, the tool 100 can have a rigid configuration. That is, the profile of the tool 100 (e.g., any curvature defined therein) can remain relatively fixed downstream of the engagement point 122. In this manner, the curvature of the tool 100 can be determined with respect to the shape and / or size of the cavity that is expected to be inspected or operated upon by the tool 100.

[0052] To facilitate bending of the tool 100, at least one of the first and second continuums 102 and 104 (e.g., both of the first and second continuums 102 and 104) may include a plurality of C-shaped portions 124 coupled together by elongated structures 126. The elongated structures 126 may extend continuously along the length of the first and / or second continuums 102 and 104. The elongated structures 126 may extend continuously along the length of the first and / or second continuums 102 and 104. In some cases, the elongated structures 126 may include a single elongated structure extending along the entire length of the first and / or second continuums 102 and 104. In other cases, the elongated structures 126 may include a plurality of elongated structures coupled together.

[0053] In one embodiment, at least one of the first and second continuums 102 and 104 (e.g., both the first and second continuums 102 and 104) may include a single (e.g., integral) component. For example, the first continuum 102 may include a one-piece structure including a single elongated structure 126 and a plurality of spaced apart C-shaped portions 124. In other embodiments, at least one of the first and second continuums 102 and 104 may include a multi-piece construction. For example, the elongated structure 126 may include a first material and the C-shaped portion 124 may include a second material different from the first material. For example, the elongated structure 126 may include a material that is more easily deformed than the material of the C-shaped portion 124. The C-shaped portion 124 may include a more elastic material than the elongated structure 126. An exemplary material of the elongated structure 126 includes spring steel. Other materials include stainless steel, nitinol, beryllium copper, and other materials that generally exhibit elastic behavior. In some cases, at least one of the C-shaped portions 124 may be attached to the elongated structure 126 by overmolding, fusion, adhesives, and the like.

[0054] Although deflection of the first continuum 102 may occur at any location along its length, in some cases, the majority of the deflection may occur at the elongated structures 126 between adjacent C-shaped portions 124. The relative amount of deflection that can be obtained by the tool 100 may be determined, at least in part, by the size of the gaps 128 between adjacent C-shaped portions 124. For example, the relative lengths 130 and widths 132 of the gaps 128 may define a maximum bend angle between adjacent C-shaped portions 124. A narrow gap 128 in direction 130 may result in reduced deflection. Similarly, a long gap 128 in direction 132 may reduce deflection. Although the gap 128 is in the Figure 5 1 and 2 as having the same size and geometry relative to one another, but in some cases, the gaps 128 may define variable sizes and / or variable geometries relative to one another.

[0055] Figure 6 The exemplary embodiment according to the present disclosure is shown Figure 5 1 is a cross-sectional view of the first and second continuums 102 and 104 of the insertion tool 100, as seen along line BB. Figure 6 The portions of the first and second continuum 102 and 104 shown in FIG. 1 are upstream of the engagement point 122. Thus, the first and second continuum 102 and 104 are not yet connected together. Figure 7 The exemplary embodiment according to the present disclosure is shown Figure 5 1. A cross-sectional view of the first and second continuum 102 and 104 of the insertion tool 100, as seen along line CC. Figure 7 The portions of the first and second continuum 102 and 104 shown in FIG. 1 are downstream of the engagement point 122. Thus, the first and second continuum 102 and 104 are connected together to form the tool 100.

[0056] like Figure 6 and 7 As shown in the exemplary embodiment of the present invention, the first and second continua 102 and 104 can be substantially identical to each other. For example, the first and second continua 102 and 104 can be reflective or rotationally symmetric to each other. References to the first continuum 102 or its features hereinafter can therefore apply to the first and second continua 102 and 104. Alternatively, one or more features of the first and second continua 102 and 104 can be different from each other.

[0057] Reference Figure 6, the first continuum 102 may include a generally C-shaped body 134. The elongated structure 126 may form a middle section of the C-shaped body 134 or be a portion thereof. The first and second arms 136 and 138 may extend from the middle section of the C-shaped body 134, such as from the elongated structure 126. In some embodiments, the lengths of the first and second arms 136 and 138 may be substantially the same as each other. In other embodiments, the lengths of the first arm 136 and the second arm 138 may be different from each other.

[0058] In the illustrated embodiment, the first arm 136 includes a receiver 140 disposed at the end of the first arm 136 and configured to receive a portion of the second continuum 104. The receiver 140 is illustrated as having a U-shaped channel into which the second arm 138 of the second continuum 104 can be inserted. The receiver 140 may include one or more features 142 configured to increase the necessary force required to separate the first and second continuums 102 and 104 from each other. In the illustrated embodiment, the one or more features 142 include a protrusion extending into the U-shaped channel to form an interference fit with the second arm 138 of the second continuum 104. In other embodiments, the one or more features 142 may include any one or more of tines, barbs, scallops, waves, castellations, or other geometric shapes configured to grip the second arm 138 of the second continuum 104. The one or more features 142 may operate in multiple directions to prevent undesired movement between the first continuum 102 and the second continuum 104. For example, in addition to maintaining the first and second continuums 102 and 104 engaged with each other, the one or more features 142 can prevent longitudinal displacement between the first and second continuums 102 and 104 .

[0059] In the illustrated embodiment, the second arm 138 has a generally linear geometry configured to extend into the receiver 140 of the second continuum 104. A guide feature 144 may be provided on the second arm 138 to prevent over-insertion of the second arm 138 into the receiver 140. In addition, the guide feature 144 may be useful to an observer or control system in preventing under-insertion. That is, an observer or control system may determine whether the guide feature 144 is spaced too far from the receiver 140 in the installed state. A gap between the guide feature 144 and the receiver 140 exceeding a threshold distance may indicate an incompletely engaged first and second continuum 102 and 104.

[0060] In other embodiments, the contact interface 106 can be formed by one or more additional or other methods other than the aforementioned friction fit or interference fit. For example, the contact interface 106 can be formed by electrostatic adhesion, magnetic attraction, chemical adhesion (e.g., thermosetting adhesive), by van der Waals forces (e.g., gecko-type, sticky feet), etc. In addition, these contact interfaces 106 can be formed using a variety of different types of attachment schemes.

[0061] Reference Figure 7 , the guide feature 144 can remain spaced apart from the receiver 140 in the engaged (i.e., coupled) configuration. The guide feature 144 can form an interface for one or more components operating on the tool 100. For example, the gap between the guide feature 144 and the receiver 140 can allow the tool to slide between the guide feature 144 and the receiver 140 to separate the first continuum 102 and the second continuum 104 from each other.

[0062] exist Figure 7 In the coupled configuration shown, the first and second continuums 102 and 104 can be combined to form a rigid structure of the tool 100. A volume 146 can be defined within the first and second continuums 102 and 104. The volume 146 can allow one or more tool components or tools to support the routing of cables, wires, etc. The size of the volume 146 can remain substantially constant along the length of the tool 100.

[0063] Figure 8 Shown along Figure 5 A front view of the first continuum 102 as viewed along line DD in FIG. The elongated structure 126 is shown having a plurality of C-shaped portions 124 extending therefrom. Figure 8 In the exemplary embodiment shown, each C-shaped portion 124 includes a first portion 124A and a second portion 124B separated by an elongated structure 126. In some cases, the first portion 124A and the second portion 124B can be arranged in a reflection symmetric manner about the elongated structure 126. In other cases, the first portion 124A and the second portion 124B can be staggered or longitudinally offset from each other along the longitudinal direction of the first continuum 102. It should be noted that a complete longitudinal offset between the first and second portions 124A and 124B will reduce the flexibility of the elongated structure 126 of the first and second continuums 102 and 104. Additional features, such as cutouts, etc., can be used to reintroduce flexibility into the elongated structure 126.

[0064] At least one of the first and second portions 124A and 124B of at least one of the C-shaped portions 124 may have a narrow base 154 and a wider head 156. The narrow base 154 may facilitate easier bending of the first continuum 102 by reducing the length of the elongated structure 126 secured to the C-shaped portion 124. For example, the narrow base 154 may define a longitudinal dimension 156 that is no greater than 99% of the longitudinal dimension 158 of the wider head 156, such as no greater than 98% of the longitudinal dimension 158, such as no greater than 97% of the longitudinal dimension 158, such as no greater than 96% of the longitudinal dimension 158, such as no greater than 95% of the longitudinal dimension 158, such as no greater than 90% of the longitudinal dimension 158, such as no greater than 80% of the longitudinal dimension 158, such as no greater than 70% of the longitudinal dimension 158, such as no greater than 60% of the longitudinal dimension 158, such as no greater than 50% of the longitudinal dimension 158. In some cases, base 154 may taper from a narrowest point closest to elongated structure 126 to a widest portion closer to head 156 .

[0065] Fig. 9 1 shows a tool system 900 for forming the tool 100 according to one or more exemplary embodiments described herein. The tool system 900 includes the aforementioned joining mechanism 118 for connecting the first and second continuums 102 and 104 together. Fig. 9 As shown, the tool system 900 includes a storage area 148 configured to store portions of at least one of the first and second continua 102 and 104 that are not active portions of the tool 100. The portions of the first and second continua 102 and 104 that are not active portions of the tool include those portions of the continua 102 and 104 that have not been connected together. For example, a first portion of the first continuum 102 may be disposed on a first side of the engagement mechanism 118 (the first side being associated with the tool 100) and a second portion of the first continuum 102 may be disposed on a second side of the engagement mechanism 118. The second portion may correspond to the portion of the continuum 102 that is not an active portion of the tool 100 at a given moment. The lengths of the first portion and the second portion may vary inversely to each other.

[0066] In one embodiment, the storage area 148 may include a first storage area 150 for storing inactive portions of the first continuum 102 and a second storage area 152 for storing inactive portions of the second continuum 104. In some cases, the first and second storage areas 150 and 152 may be configured to store the first and second continuums 102 and 104, respectively, in a rolled-up configuration. That is, the deflectable radius of curvature of the first and second continuums 102 and 104 may allow for rolling, space-saving storage of those portions of the first and second continuums 102 and 104 that are not actively used by the tool 100. For example, at least one of the first and second storage areas 150 and 152 may include a rotatable element, such as a rotatable reel. When the tool 100 is deflected from the engagement mechanism 118, the first storage area 150 and the second storage area 152 may respectively unfold the first continuum 102 and the second continuum 104 to feed the engagement mechanism 118 and extend the tool 100. Similarly, when the tool 100 is biased toward the engagement mechanism 118 , the first storage region 150 and the second storage region 152 may wrap around the first continuum 102 and the second continuum 104 , respectively, to store the first continuum 102 and the second continuum 104 .

[0067] In another embodiment, at least one of the first and second storage areas 150 and 152 can be operated by a mechanism different from the aforementioned rotational operation scheme. For example, the first and second continua 102 and 104 can be placed linearly in the storage area, optionally including curved portions to form a zigzag or other similar pattern.

[0068] In some cases, at least one of the first and second storage areas 150 and 152 can be driven. That is, unwinding and / or winding the first and second continuums 102 and 104 can be performed at least in part by rotatably biasing the first and / or second storage areas 150 and 152. In other cases, at least one of the first and second storage areas 150 and 152 can be passive. In this way, winding and / or unwinding the first and second continuums 102 and 104 relative to the first and second storage areas 150 and 152, respectively, can be performed by a separate component, such as the drive mechanism 116.

[0069] In one embodiment, when in the fully stored position, i.e., when the first and second continuum 102 and 104 are not actively being used to form the tool 100, at least one of the first and second continuum 102 and 104 may remain at least partially engaged with the engagement mechanism 118. That is, the first and / or second continuum 102 and 104 may not be fully stored (e.g., rolled up) on the first and second storage areas 150 and 152 in the stored position. Instead, the distal ends 112A and 112B may remain coupled to the engagement mechanism 118. This may help to more easily form future tools 100 without having to re-feed the first and second continuum 102 and 104 therein.

[0070] After each successive use of the tool 100 is completed, the first and second continuums 102 and 104 may be at least partially retracted into the first and second storage areas 150 and 152. The distal ends 112A and 112B may be maintained in a relatively fixed longitudinal position relative to each other in the storage position.

[0071] In one embodiment, at least one of the first and second continuums 102 and 104 can define a length that is no less than the length of the tool 100. In one particular embodiment, both the first and second continuums 102 and 104 can define a length that is greater than the length of the tool 100.

[0072] Fig.10 A cross-sectional view of one embodiment of an insertion tool 100 is shown, which includes a separation element 160 arranged in alignment with the first continuum 102 and the second continuum 104 so as to separate them from each other when the first continuum 102 and the second continuum 104 are removed from the cavity. As a non-limiting example, the separation element 160 may include a wedge configured to be disposed between the first and second continuums 102 and 104. When the tool 100 is biased in a direction toward the separation element 160, the wedge configuration of the separation element 160 (or another suitable separation scheme) can separate the first and second continuums 102 and 104 from each other.

[0073] Fig.111 is a flow chart of a method 1100 for inserting a tool into a cavity. The method 1100 includes a step 1102 of passing a first continuum through a coupling mechanism at a first speed and a step 1104 of passing a second continuum through the coupling mechanism at a second speed. The relative difference between the first speed and the second speed at steps 1102 and 1104 can determine the relative curvature of the tool. For example, when the first speed is greater than the second speed, the first continuum can form an outer surface of the tool curvature, that is, the radius of curvature of the first continuum is greater than the radius of curvature of the second continuum. Conversely, when the second speed is greater than the first speed, the second continuum can form an outer surface of the tool curvature, that is, the radius of curvature of the second continuum is greater than the radius of curvature of the first continuum. In the case where the first continuum and the second continuum are stored in a curled configuration, steps 1102 and 1104 can be performed by unwinding the first and second continuum from the curled configuration. This can include offsetting a reel storing at least one of the first and second continuums, or pulling the first and / or second continuum from the reel by another drive mechanism.

[0074] The method 1100 also includes a step 1106 of coupling the first and second continua together to form a tool using a coupling mechanism. When the first and second continua are traveling at different speeds, coupling the first and second continua together results in the curvature being selectively maintained within the tool. The step 1106 of coupling the first and second continua together using a coupling mechanism can be performed at a location close to the cavity, such as adjacent to the cavity. When the tool is formed at step 1106, its distal end can enter the cavity while the first and second continua are passing through the coupling mechanism. That is, the front portion of the tool can enter the cavity because the rear portion behind the front portion is being formed by the coupling mechanism.

[0075] The method 1000 also includes a step 1108 of adjusting the first speed to form a bend in the tool. The bend formed at step 1108 may have a smaller or larger radius of curvature than the radius of curvature of the tool at an immediately adjacent location. For example, the step 1108 of adjusting the first speed may be performed to achieve a particular geometry necessary to insert a tool into a cavity to clear obstructions and structures therein.

[0076] Fig.121 is a flow chart of a method 1200 for inserting a tool into a cavity according to another exemplary embodiment. The method 1200 includes a step 1202 of passing a first continuum through a coupling mechanism and a step 1104 of passing a second continuum through a coupling mechanism. The method also includes a step 1206 of coupling the first and second continuums together using a coupling mechanism to form a tool. The shape of the formed tool is defined by the shape of the coupling mechanism. In one or more cases, the operator can selectively change the coupling mechanism to change the shape of the tool formed at step 1206. More specifically, the operator can select a coupling mechanism from a plurality of coupling mechanisms, wherein at least two of the plurality of coupling mechanisms have different shapes compared to each other. The selective change between two or more of the plurality of coupling mechanisms can occur, for example, when the operator moves the tool between different cavities being inspected or even during the inspection of a single cavity. For example, when inspecting different engines or during the inspection of a single engine, the operator can change to a different coupling mechanism.

[0077] Now refer to the reference Fig.13 and 14 According to one or more embodiments, the aforementioned insertion tool 100 may be at least partially formed of one or more continuous bodies having a multi-piece construction. Fig.13 , an exemplary continuum 1300 is depicted as including an elongated structure 1302 that is configured to receive a body 1304, such as a C-shaped body. The elongated structure 1302 and the body 1304 may include discrete, i.e., separate elements that may be connected together to form the continuum 1300. The body 1304 may be similar in joint arrangement to the previously described generally C-shaped body 134. In this manner, the body 1304 may be connected together in a manner as previously described to form the insertion tool 100.

[0078] In some cases, the body 1304 can translate, e.g., slide, relative to the elongated structure 1302 in the longitudinal direction L. In this way, the body 1304 can translate relative to the elongated structure 1302 during the formation of the continuum 1300. As a non-limiting example, the body 1304 can include a guide feature 1306 that slides along the elongated structure 1302. The guide feature 1306 may include one or more tracks, slots, etc., which are arranged to guide the body 1304 relative to the elongated structure 1302. In one embodiment, at least one body 1304 can be mounted at a longitudinal end of the elongated structure 1302. In another embodiment, at least one body 1304 can be mounted on the elongated structure 1302 at a location spaced apart from the longitudinal end thereof.

[0079] The elongated structure 1302 may include a plurality of receiving areas 1308, wherein at least some of the receiving areas 1308, such as all of the receiving areas 1308, are configured to receive one or more bodies 1304. The bodies 1304 may be translated relative to the elongated structure 1302 until aligned with the appropriate receiving areas 1308. The receiving areas 1308 may generally include a mechanism for engaging with the bodies 1304. As a non-limiting example, at least one of the receiving areas 1308 may include an opening extending into the elongated structure 1302, such as through the elongated structure 1302. In the illustrated embodiment, at least some of the bodies 1304 may define an interface configured to be secured to the elongated structure 1302 using a connection member 1310. The interface may include, for example, an opening 1312 configured to align with one or more of the receiving areas 1308. In some cases, the receiving areas 1308 may be spaced equidistant from each other. The spacing between adjacent receiving areas 1308 and 1308 may be sized such that the body 1304 is operably arranged to allow the continuum 1300 to flex during formation of the rigid portion of the tool 100 .

[0080] The connecting member 1310 can secure the opening 1312 of the body 1304 with the receiving area 1308 of the elongated structure 1302. In certain embodiments, the connecting member 1310 can be engaged at the interface by sliding the connecting member 1310 through at least a portion of the body 1304 and the elongated structure 1302. For example, the connecting member 1310 can secure the interface by translating in a direction generally perpendicular to the longitudinal direction L in which the body 1304 translates relative to the elongated structure 1302. In one embodiment, the interface between the connecting member 1310 and at least one of the elongated structure 1302 and the body 1304 can include a locking interface configured to prevent accidental removal of the connecting member 1310, a tactile indicator that the connecting member 1310 is properly in place, or both. With the body 1304 secured in place relative to the elongated structure 1302, the continuum 1300 can be connected to another continuum to form the tool 100.

[0081] Fig.14 A continuum 1400 having a different multi-piece configuration is shown according to another exemplary embodiment. Fig.13 The illustrated embodiment is different in that the body 1304 translates in the longitudinal direction L relative to the elongated structure 1302. Fig.14The continuum 1400 depicted in FIG. 1 allows one or more bodies 1404 to be mounted along the elongated structure 1402 in a direction generally perpendicular to the longitudinal direction L. As shown, the body 1404 can be mounted on the elongated structure 1402 by translating the body 1404 in a direction P that is perpendicular or generally perpendicular to the longitudinal direction L of the elongated structure 1402. The guide features 1406 can align the body 1404 relative to the elongated structure 1402. For example, the guide features 1406 can align (e.g., center) each body 1404 relative to the transverse axis T so that the engagement features 1408 of the body 1404 are aligned with the receiving area 1410 of the elongated structure 1402. The engagement features 1408 can engage with the receiving area 1410 to secure the body 1404 to the elongated structure 1402.

[0082] In one embodiment, the engagement feature 1408 can be secured to the receiving region 1410 by mechanical and / or chemical fasteners. For example, the engagement feature 1408 can be crimped, fastened, pinned, welded, heat fused, or otherwise mechanically attached to the receiving region 1410 and / or chemically fastened to the receiving region 1410, such as by adhesive bonding.

[0083] It should be understood that Fig.13 and Fig.14 The illustrated embodiments are not exclusive, and certain aspects of each embodiment may be used together in embodiments not shown. A multi-piece constructed continuum may allow for the use of different materials between the elongated structures 1302, 1402 and the main bodies 1304, 1404. For example, at least one of the main bodies 1304, 1404 may include a first material, and the elongated structures 1302, 1402 may include a second material different from the first material. As a non-limiting example, the first material may include a polymer, such as a molded thermoplastic, and the second material may include a metal, such as spring steel. In an embodiment, at least two of the main bodies 1304, 1404 mounted on the elongated structures 1302, 1402 may have different properties from each other, for example, at least two main bodies 1304, 1404 may be formed of different materials compared to each other. In this way, the continuum may be designed for use in specific environments where variable continuum properties measured at different locations along the continuum are desirable.

[0084] In one embodiment, the insertion tool 100 may be formed by a first continuum having a one-piece structure and a second continuum having a multi-piece structure. In another embodiment, the insertion tool 100 may be formed by continua of similar structure, such as two one-piece continua or two multi-piece continua. In other embodiments, the insertion tool 100 may be formed by more than two continua, such as three continua, four continua, five continua, etc.

[0085] Insertion tools according to embodiments described herein can generally allow inspection and operation in cavities such as gas turbine engines without the need for complex, precision parts that may break or get stuck in the cavity. In addition, insertion tools according to embodiments described herein can allow inspection of multiple different areas, such as different engines, without using repetitive tools specific to each engine design. Further, the use of insertion tools according to certain embodiments can eliminate the longitudinal accuracy requirements between two or more continua. That is, the continua can be connected together without the need for strict longitudinal tolerances. Moreover, the use of tools according to certain embodiments described herein can allow infinite adjustability of the curvature and shape of the tool, which allows reusability and minimal downtime between insertions. This is especially true for insertion tools that use variable speeds between the first and second continua to allow control of the shape of the insertion tool.

[0086] This written description uses examples to disclose the invention, including the best mode, and also to enable a person 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 a person 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 with insubstantial differences from the literal language of the claims.

[0087] Further aspects of the invention are provided by the subject matter of the following clauses:

[0088] Embodiment 1. A tool system for inserting a cavity, the tool system comprising: a first continuum having a flexible body defining a first connection interface; a second continuum having a flexible body defining a second connection interface; and a coupling mechanism constructed to connect the first and second connection interfaces of the first and second continuums together to form a tool.

[0089] Embodiment 2. A tool system according to any one or more of the embodiments, wherein the tool has a length defined by the distance between a distal end of the tool and a proximal end of the tool, the distal end of the tool is constructed to be inserted into a cavity, the proximal end of the tool is disposed at a coupling mechanism, and wherein at least one of the first and second continua defines a length greater than the length of the tool.

[0090] Embodiment 3. The tool system according to any one or more of the embodiments, wherein the first and second continuums each include a body, and wherein the bodies of the first and second continuums have the same cross-sectional shape as each other.

[0091] Embodiment 4. The tool system according to any one or more of the embodiments, wherein at least one of the first continuum and the second continuum has a substantially C-shaped cross-sectional profile.

[0092] Embodiment 5. The tool system according to any one or more of the embodiments, wherein the tool system comprises a storage area configured to store a portion of at least one of the first continuum and the second continuum that is not an active portion of the tool.

[0093] Embodiment 6. A tool system according to any one or more embodiments of the embodiments, wherein the connection interface between the first and second continua comprises at least one of a friction interface, an electrostatic adhesion interface, a magnetic interface, a chemical adhesion interface, van der Waals forces, or any combination thereof.

[0094] Embodiment 7. The tool system of any one or more of the embodiments, wherein the engagement mechanism is selected from a plurality of engagement mechanisms, and wherein at least two engagement mechanisms of the plurality of engagement mechanisms comprise unique attributes.

[0095] Embodiment 8. The tool system of any one or more of the embodiments, wherein the radii of curvature of all of the plurality of curved segments are arranged in a same plane.

[0096] Embodiment 9. A tool for insertion into a cavity of an aircraft engine, the tool comprising: a flexible first continuum; and a flexible second continuum, wherein the first and second continuums are selectively engageable with each other, and wherein when selectively engaged, the first and second continuums have a substantially rigid construction.

[0097] Embodiment 10. The tool of any one or more of the embodiments, wherein a first half of the tool, viewed in cross-section, comprises a first continuum, and wherein a second half of the tool, viewed in cross-section, comprises a second continuum.

[0098] Embodiment 11. A tool according to any one or more embodiments of the embodiments, wherein when the first continuum and the second continuum are joined to each other, the tool comprises a plurality of curved segments, wherein each curved segment has a radius of curvature, and wherein all the radii of curvature are arranged in the same plane.

[0099] Embodiment 12. A tool according to any one or more embodiments of the embodiments, wherein the tool has a length defined by the distance between the distal end of the tool and the proximal end of the tool, the distal end of the tool is configured to be inserted into a cavity, the proximal end of the tool is disposed at a coupling mechanism, the coupling mechanism is configured to couple the connection interfaces of the first and second continuums together to form a tool, and wherein at least one of the first and second continuums defines a length greater than the length of the tool.

[0100] Embodiment 13. A tool according to any one or more embodiments of the embodiments, wherein at least one of the first continuum and the second continuum comprises a plurality of C-shaped portions connected together by an elongated structure, and wherein at least one of the first continuum and the second continuum is flexible at the interface between adjacent C-shaped portions.

[0101] Embodiment 14. A method for inserting a tool into a cavity, the method comprising: passing a first continuum through a coupling mechanism; passing a second continuum through a coupling mechanism; and connecting the first continuum and the second continuum together using the coupling mechanism to form a tool, wherein the shape of the formed tool is defined by the shape of the coupling mechanism.

[0102] Embodiment 15. The method of any one or more of the embodiments, further comprising selecting the engagement mechanism from a plurality of engagement mechanisms, and wherein at least two engagement mechanisms of the plurality of engagement mechanisms have different shapes compared to each other.

[0103] Embodiment 16. The method of any one or more of the embodiments, further comprising changing the engagement mechanism from the first engagement mechanism to the second engagement mechanism after passing the first portion of the first continuum and the second continuum through the first engagement mechanism.

[0104] Embodiment 17. The method of any one or more of the embodiments, wherein the formed tool comprises a relatively rigid construction, and wherein the first and second continuums each comprise a relatively flexible construction.

[0105] Embodiment 18. A method according to any one or more of the embodiments, wherein the first continuum and the second continuum each define a longitudinal length, and wherein connecting the first continuum and the second continuum together includes translating at least one of the first continuum and the second continuum toward the other of the first continuum and the second continuum in a direction generally transverse to the longitudinal length at a point of engagement of the first and second continuums.

[0106] Embodiment 19. The method of any one or more of the embodiments, further comprising moving the distal end of the tool into the cavity while passing at least one of the first and second continuums through the engagement mechanism.

[0107] Embodiment 20. A method according to any one or more of the embodiments, wherein the first continuum is stored in a curled configuration, and wherein passing the first continuum through the engagement mechanism is performed by unrolling the first continuum from the curled configuration.

Claims

1. A tool system for inserting into a cavity of a gas turbine engine, characterized in that The tool system comprises: a first continuum having a flexible body defining a first connection interface therealong; and a second continuum having a flexible body defining a second connection interface therealong; and A joining mechanism is configured to couple the first connection interface and the second connection interface of the first continuum and the second continuum together to form a tool.

2. The tool system according to claim 1, characterized in that: wherein the tool has a length defined by a distance between a distal end of the tool and a proximal end of the tool, the distal end of the tool being configured to be inserted into the cavity, the proximal end of the tool being disposed at the engagement mechanism, and wherein at least one of the first continuum and the second continuum defines a length greater than the length of the tool.

3. The tool system according to claim 1, characterized in that: The first continuum and the second continuum each include a body, and the bodies of the first continuum and the second continuum have the same cross-sectional shape as each other.

4. The tool system according to claim 1, characterized in that: At least one of the first continuum and the second continuum has a substantially C-shaped cross-sectional profile.

5. The tool system according to claim 1, characterized in that: Wherein the tool system includes a storage area configured to store a portion of at least one of the first continuum and the second continuum that is not an active portion of the tool.

6. The tool system according to claim 1, characterized in that: The connection interface between the first continuum and the second continuum includes at least one of a friction interface, an electrostatic adhesion interface, a magnetic interface, a chemical adhesion interface, van der Waals force, or any combination thereof.

7. The tool system according to claim 1, characterized in that: Wherein the engagement mechanism is selected from a plurality of engagement mechanisms, and wherein at least two engagement mechanisms of the plurality of engagement mechanisms comprise unique attributes.

8. The tool system according to claim 7, characterized in that: The tool system comprises a plurality of curved segments, and the curvature radii of all the curved segments in the plurality of curved segments are arranged in the same plane.

9. A tool for insertion into a cavity of an aircraft engine, characterized in that The tools include: a first continuum of flexibility; and The second continuum of flexibility, Wherein the first continuum and the second continuum are selectively engageable with each other along the first continuum and the second continuum, and wherein when selectively engaged, the first continuum and the second continuum have a substantially rigid configuration.

10. The tool according to claim 9, characterized in that wherein a first half of the tool, seen in cross section, comprises the first continuum, and wherein a second half of the tool, seen in cross section, comprises the second continuum.

11. The tool according to claim 9, characterized in that Wherein when the first continuum and the second continuum are engaged with each other, the tool comprises a plurality of curved segments, wherein each curved segment has a radius of curvature, and wherein all the radii of curvature are arranged in the same plane.

12. The tool according to claim 9, characterized in that The tool has a length defined by the distance between a distal end of the tool and a proximal end of the tool, the distal end of the tool is configured to be inserted into the cavity, the proximal end of the tool is disposed at a coupling mechanism, the coupling mechanism is configured to couple the connection interfaces of the first continuum and the second continuum together to form the tool, and wherein at least one of the first continuum and the second continuum defines a length greater than the length of the tool.

13. The tool according to claim 9, characterized in that Wherein at least one of the first continuum and the second continuum comprises a plurality of C-shaped portions coupled together by an elongated structure, and wherein at least one of the first continuum and the second continuum is flexible at interfaces disposed between adjacent C-shaped portions.

14. A method of inserting a tool into a cavity of a gas turbine engine, characterized in that: The method comprises: passing the first continuous body through the engaging mechanism; passing a second continuum through the engagement mechanism; and coupling the first and second continuum bodies together using the engagement mechanism to form the tool, wherein a shape of the formed tool is defined by a shape of the engagement mechanism; Wherein at least one of the first continuum and the second continuum comprises a plurality of bodies coupled together by an elongated structure, and wherein at least one of the first continuum and the second continuum is flexible at interfaces disposed between adjacent bodies.

15. The method according to claim 14, characterized in that Further comprising selecting the engagement mechanism from a plurality of engagement mechanisms, and wherein at least two engagement mechanisms of the plurality of engagement mechanisms have different shapes compared to each other.

16. The method according to claim 15, characterized in that Further comprising changing the engagement mechanism from the first engagement mechanism to a second engagement mechanism after the first portion of the first continuum and the second continuum pass through the first engagement mechanism.

17. The method according to claim 14, characterized in that The tool formed therein comprises a relatively rigid construction, and wherein the first continuum and the second continuum each comprise a relatively flexible construction.

18. The method of claim 14, wherein: wherein the first continuum and the second continuum each define a longitudinal length, and wherein coupling the first continuum and the second continuum together comprises translating at least one of the first continuum and the second continuum toward the other of the first continuum and the second continuum at a point of engagement of the first continuum and the second continuum in a direction generally transverse to the longitudinal length.

19. The method of claim 14, wherein: Further comprising moving the distal end of the tool into the cavity while at least one of the first continuum and the second continuum passes through the engagement mechanism.

20. The method of claim 14, wherein: wherein the first continuum is stored in a curled configuration, and wherein passing the first continuum through the engagement mechanism is performed by unrolling the first continuum from the curled configuration.

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