Embodiments of the subject matter described herein relate generally to repair tools and maintenance procedures for vehicles, such as aircraft. More particularly, embodiments of the subject matter relate to a tool for removing threaded inserts from a supporting structure, and related methods that use the tool.
In various industries and applications, certain structural and/or operating components require inspection, preventive maintenance, routine removal and replacement, and/or service maintenance. For example, a vehicle such as an aircraft may have certain components, devices, fasteners, or parts that are periodically removed for inspection or replacement. In this regard, an aircraft may include a number of removable panels, walls, or shrouds that are held in place with threaded inserts and fasteners. Over time, the threaded inserts and/or the fasteners may need to be maintained or replaced.
Accordingly, it is desirable to have a tool that is designed to quickly and easily remove an insert from a supporting structure, with little to no damage to the supporting structure and little to no structural degradation. In addition, it is desirable to have a related procedure for removing an insert from a supporting structure, which is appropriate for various vehicle and aircraft applications. Furthermore, other desirable features and characteristics will become apparent from the subsequent detailed description and the appended claims, taken in conjunction with the accompanying drawings and the foregoing technical field and background.
A tool for removing a threaded insert from a supporting wall structure is shown and described here. The threaded insert has a flange and an internally threaded barrel extending from the flange. Embodiments of the tool include a bracket and a plunger component that cooperates with the bracket. The bracket includes: a structure supporting arm having a hole formed therein, the hole shaped and sized to receive the flange of the threaded insert, and to accommodate translation of the threaded insert through the structure supporting arm; a plunger positioning arm having a threaded hole formed therein; a connecting section coupling the structure supporting arm to the plunger positioning arm, wherein at least a portion of the structure supporting arm opposes at least a portion of the plunger positioning arm; and a gap defined between the structure supporting arm and the plunger positioning arm, the gap shaped, sized, and configured to receive the supporting wall structure. The plunger component includes: a threaded body configured to engage the threaded hole of the plunger positioning arm; a pedestal extending from a distal end of the threaded body, the pedestal having a distal end defining a bearing surface that contacts an exposed end of the threaded insert during use; and a guide tip extending from the distal end of the pedestal, the guide tip shaped and sized to fit within the internally threaded barrel of the threaded insert during use. Insertion of the plunger component into the bracket moves the bearing surface of the pedestal against the exposed end of the threaded insert, and continued insertion of the plunger component into the bracket increases force imparted on the exposed end of the threaded insert. Further insertion of the plunger component into the bracket releases the threaded insert from the supporting wall structure to allow movement of the flange of the threaded insert within the hole of the structure supporting arm.
Also described here is a method of removing a threaded insert from a supporting wall structure having an exposed outer edge, where the threaded insert has a flange and an internally threaded barrel extending from the flange. Embodiments of the method involve: introducing a bracket onto the exposed outer edge of the supporting wall structure, wherein the bracket includes a structure supporting arm having a hole formed therein, and the bracket includes a plunger positioning arm having a threaded hole formed therein. The bracket is positioned such that the structure supporting arm is located on a first side of the supporting wall structure, the plunger positioning arm is located on a second side of the supporting wall structure, and the flange resides in the hole. The method continues by actuating a plunger component threaded into the threaded hole of the plunger positioning arm, to move a distal end section of the plunger component toward an exposed end of the threaded insert. The plunger component is further actuated to increase force imparted on the exposed end of the threaded insert, until the threaded insert is released from the supporting wall structure. Further actuation of the plunger component moves the threaded insert within the hole of the structure supporting arm.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
A more complete understanding of the subject matter may be derived by referring to the detailed description and claims when considered in conjunction with the following figures, wherein like reference numbers refer to similar elements throughout the figures.
The following detailed description is merely illustrative in nature and is not intended to limit the embodiments of the subject matter or the application and uses of such embodiments. As used herein, the word “exemplary” means “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. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description.
Certain terminology may also be used in the following description for the purpose of reference only, and thus are not intended to be limiting. For example, terms such as “upper”, “lower”, “above”, and “below” refer to directions in the drawings to which reference is made. Terms such as “front”, “back”, “rear”, “side”, “outboard”, and “inboard” describe the orientation and/or location of portions of the component within a consistent but arbitrary frame of reference which is made clear by reference to the text and the associated drawings describing the component under discussion. Such terminology may include the words specifically mentioned above, derivatives thereof, and words of similar import. Similarly, the terms “first”, “second”, and other such numerical terms referring to structures do not imply a sequence or order unless clearly indicated by the context.
Various embodiments contemplated herein relate to a tool for removing an insert (e.g., a threaded insert) from a supporting wall structure of the type found in a vehicle such as an aircraft. This disclosure also relates to a related method of removing an insert, which uses the disclosed removal tool. In accordance with the disclosed embodiment, the tool includes a generally C-shaped bracket and an adjustable plunger component that is threaded into the bracket. The bracket includes two arms that allow the bracket to be positioned on an edge of the supporting wall structure with the two arms extending above and below the outer surfaces of the supporting wall structure. One arm includes a hole that receives a flange of the insert that is to be removed. The other arm includes a threaded hole that receives the plunger component. The plunger component is actuated (rotated) to advance its distal end toward an exposed end of the insert. Continued rotation of the plunger component imparts increasing force on the insert, until the insert is released from the supporting wall structure. The body of the arm surrounding the flange of the insert supports the underlying area of the supporting wall structure during use, which protects the underlying wall structure from damage associated with the insert removal procedure.
Referring to the drawings,
As shown in
The threaded inserts 109 are secured to the supporting wall structure 104 by feeding the barrel 124 into a hole or passageway formed in the supporting wall structure 104. The flat surface of the flange 114 surrounding the pedestal region 126 is glued, bonded, welded, or otherwise affixed to the surface of the supporting wall structure 104 that immediately surrounds the hole or passageway. Consequently, the threaded insert 109 remains in place relative to the supporting wall structure 104, and does not rotate when the fastener 108 is tightened to hold the removable panel 102 against the supporting wall structure 104.
The tool described herein is used to gently remove the threaded inserts 109 in a non-destructive manner. The tool is used to break the bond between the threaded insert 109 and the supporting wall structure 104 in a way that preserves the structural integrity of the supporting wall structure 104 with little to no resulting physical trauma or damage. Consequently, a new threaded insert 109 can be quickly and easily installed to replace the one that was removed. Maintaining the physical integrity of the supporting wall structure 104 is particularly important when the supporting wall structure 104 is fabricated from material or one or more layers of material that might be susceptible to damage during removal of the threaded inserts 109. For example, the supporting wall structure 104 may be fabricated from, or include a layer of, composite material, rigid thermal insulation material, carbon fiber material, or the like.
The depicted embodiment of the bracket 202 includes, without limitation: a structure supporting arm 208; a plunger positioning arm 210; a connecting section 212; and a gap 214 defined between the structure supporting arm 208 and the plunger positioning arm 210. In accordance with certain embodiments, the structure supporting arm 208, the plunger positioning arm 210, and the connecting section 212 are integrally formed together. In this regard, the bracket 202 can be fabricated as a one-piece component using any suitable material or combination of materials (e.g., a machined or cast metal, fabricated by way of an additive manufacturing technique, a composite material, a plastic or nylon material, or the like). In accordance with other embodiments, the structure supporting arm 208 and/or the plunger positioning arm 210 are removable from the connecting section 212. In such embodiments, the connecting section 212 may be configured for compatibility with a plurality of differently shaped and sized structure supporting arms, and/or the connecting section 212 may be configured for compatibility with a plurality of differently shaped and sized plunger positioning arms. For example, the lengths of the arms can be changed to accommodate different installation locations of the threaded inserts 109 (which may be relatively close to the edge 118 of the supporting wall structure 104 or relatively far from the edge 118). As another example, it may be desirable to have a selectable hole size or shape (for the hole in the structure supporting arm) to accommodate differently shaped or sized inserts. The dashed lines in
The connecting section 212 couples the structure supporting arm 208 to the plunger positioning arm 210, such that at least a portion of the structure supporting arm 208 opposes at least a portion of the plunger positioning arm 210. More specifically, an inward-facing surface of the structure supporting arm 208 opposes and faces an inward-facing surface of the plunger positioning arm 210. These opposing inward-facing surfaces define the height, H, of the gap 214 (see
The plunger positioning arm 210 includes an internally threaded hole 222 formed therein, and the structure supporting arm 208 includes a hole 224 formed therein. The threaded hole 222 is configured in accordance with the dimensions and thread specifications of the plunger component 204. The hole 224 is shaped and sized to receive the flange 114 of the threaded insert 109, and is shaped and sized to accommodate translation of the threaded insert 109 through the structure supporting arm 208 as needed. Although not always required, the hole 224 is preferably circular in shape to accommodate the circular shape of the flange 114. In accordance with certain embodiments, the flange 114 has a circular perimeter with a flange diameter, the hole 224 has a circular perimeter with a hole diameter, the hole diameter is greater than the flange diameter, and the difference between the hole diameter and the flange diameter is about 0.015 to about 0.0040 inches. In certain embodiments, the difference between the hole diameter and the flange diameter is less than or equal to 0.0040 inches. This tight tolerance is desirable to accommodate an accurate placement of the flange 114 within the hole 224 while providing adequate physical support to the section of the supporting wall structure 104 that is immediately adjacent to the flange 114.
The illustrated embodiment of the plunger component 204 includes, without limitation: a threaded body 230 that is configured to engage the threaded hole 222 of the plunger positioning arm 210; a pedestal 232 extending from a distal end 234 of the threaded body 230; and a guide tip 236 extending from a distal end 240 of the pedestal 232. The distal end 240 of the pedestal 232 defines a bearing surface that contacts an exposed end of the threaded insert 109 during use. The guide tip 236 is shaped, sized, and configured to fit within the internally threaded barrel 124 of the threaded insert 109 during use. The plunger component 204 also includes a head 244 coupled to or integrated with a proximal end 246 of the threaded body 230. The head 244 includes at least one structural feature that is compatible with a torque-applying tool, device, or system. In this regard, the illustrated embodiment of the plunger component 204 can be fabricated from a threaded bolt having the pedestal 232, the guide tip 236, and the head 244 integrally formed therein. For example, the end of a threaded bolt can be machined or otherwise processed to define the pedestal 232, the guide tip 236, and the bearing surface. Moreover, the head 244 may be a standard hex shaped bolt head that is compatible with a torque-applying tool such as a socket, a wrench, or the like. Alternatively or additionally, the head 244 may include one or more structural features that are compatible with a screwdriver, an Allen wrench tool, or the like.
In certain embodiments, the hole 224 in the structure supporting arm 208 and the threaded hole 222 in the plunger positioning arm 210 are concentric and aligned with the central longitudinal axis of the plunger component 204 when the plunger component 204 is engaged with the bracket 202. Moreover, the pedestal 232 and the guide tip 236 are concentric and aligned with the central longitudinal axis of the plunger component 204. This concentrically aligned arrangement is shown in
A method of removing a threaded insert from a supporting wall structure will now be described with reference to
The exemplary procedure described here begins by introducing the bracket 202 onto the exposed outer edge 118 of the supporting wall structure 104, and by positioning the bracket 202 such that: the structure supporting arm 208 is located on a first side (e.g., the interior side) of the supporting wall structure 104; the plunger positioning arm 210 is located on a second side (e.g., the exterior side) of the supporting wall structure 104; and the flange 114 of the threaded insert 109 resides in the hole 224 of the plunger positioning arm 210.
This description assumes that the plunger component 204 is already engaged with the plunger positioning arm 210 of the bracket 202, as depicted in
After the bearing surface of the pedestal 232 makes contact with the end of the threaded insert 109, the plunger component 204 can be further actuated (e.g., rotated), resulting in continued insertion of the plunger component 204 into the bracket. Continued insertion of the plunger component 204 increases the amount of force imparted on the exposed end of the threaded insert 109, which initially remains fixed in its original position in the supporting wall structure 104. The plunger component 204 is further actuated in this manner to continue increasing the amount of force imparted by the bearing surface of the pedestal 232 until the amount of force is sufficient to release the threaded insert 109 from the supporting wall structure 104. In this regard, the plunger component 204 is rotated until it breaks the bond between the threaded insert 109 and the supporting wall structure 104, and the bond (if any) between the threaded insert 109 and the outer collar 110. Notably, the surface of the structure supporting arm 208 (which is in contact with the supporting wall structure 104) provides support immediately surrounding the periphery of the flange 114, such that the flange 114 can be effectively and accurately released with little to no resulting structural damage to the supporting wall structure 104. Releasing the threaded insert 109 in this manner allows movement of the flange 114 within the hole 224 of the structure supporting arm 208.
After the threaded insert 109 is free from the supporting wall structure 104, continued insertion of the plunger component 204 into the bracket 202 moves the threaded insert 109 even further within the hole 224, and eventually decouples the threaded insert 109 from the outer collar 110 (the outer collar 110 can remain in the same position shown in
For the non-limiting example presented here, the plunger component 204 is advanced until the threaded insert 109 is decoupled from the supporting wall structure 104, and has traveled sufficiently far to accommodate removal. Thereafter, the methodology involves retracting the plunger component 204 to facilitate removal of the threaded insert 109 (if it hasn't already been removed) and to facilitate removal of the bracket 202 from the supporting wall structure 104. The following description assumes that the threaded insert 109 remains in place after it has been released from the supporting wall structure 104. Accordingly, retracting (e.g., by rotation in the appropriate direction) the plunger component 204 separates the bearing surface of the pedestal 232 from the end of the internally threaded barrel 124 and eventually withdraws the pedestal from the collar hole 302 of the outer collar 110 (see
While at least one exemplary embodiment has been presented in the foregoing detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or embodiments described herein are not intended to limit the scope, applicability, or configuration of the claimed subject matter in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient road map for implementing the described embodiment or embodiments. It should be understood that various changes can be made in the function and arrangement of elements without departing from the scope defined by the claims, which includes known equivalents and foreseeable equivalents at the time of filing this patent application.
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5031487 | Polonsky | Jul 1991 | A |
5148590 | Wu | Sep 1992 | A |
5586378 | Smith | Dec 1996 | A |
5713117 | Bliss | Feb 1998 | A |
7568267 | Lehner | Aug 2009 | B2 |
9751199 | Andrews | Sep 2017 | B2 |
20060200957 | Lehner | Sep 2006 | A1 |