A releasable fastener

Abstract

The present invention discloses a releasable fastener assembly for securing an object to a structure, the releasable fastener assembly comprising a locking component having a first portion, a second portion and a central opening, a front portion in an initial position defined by a first orientation adapted to be received by the first portion, and an end portion for receiving by the front portion through the central opening such that rotation of the end portion in a first direction causes the front portion to disengage from the first portion and to rotate into a transitional position substantially transverse to the first orientation until it is retained within the first portion, and further rotation of the end portion in the same direction causes the front portion to move axially towards the structure thereby clamping the object to the structure.

Description

A RELEASABLE FASTENERTechnical Field

[0001] The present disclosure generally relates to releasable fasteners. More particularly, it relates to a releasable fastener for a one-sided bolt system for use in industrial applications such as mining.Background

[0002] This application is related to the following applications: (1) Singapore Patent Application No. 10202302769Q “A LOCKING SEAL FOR A BLIND-SIDED BOLT SYSTEM,” filed 28 September 2023; and (2) PCT International Application No. PCT / SG2024 / 050153 “A FASTENER FOR A ONE-SIDED BOLT SYSTEM,” filed 14 March 2024; All of these applications are incorporated by reference herein.

[0003] The following discussion of the background to the invention is intended to facilitate an understanding of the present invention However, it should be appreciated that the discussion is not an acknowledgment or admission that any of the material referred to was published, known or part of the common general knowledge in any jurisdiction as at the priority date of the application.

[0004] In the mining industry, as well as in general industrial applications, one-sided bolt systems allow for the attachment of components, for example, replaceable wear liners, from one side of a structure, which is often a critical requirement in confined or hard-to- reach areas. The common use of these systems highlights their utility and the demand for efficient one-sided fastening solutions.

[0005] Releasable fasteners play a pivotal role in various industrial applications, ensuring the secure attachment of components while allowing for convenient disassembly andreassembly. In the realm of bolt systems, particularly those designed for one-sided applications, the optimization of fastening assemblies hold significant importance.

[0006] Traditional one-sided bolt systems used in mining applications conventionally feature a nut positioned on the inner side of the chute wall. However, this configuration poses notable challenges, particularly concerning wear liners. These liners often suffer from the creation of large holes due to the placement of the nut, consequently becoming susceptible to localized wear over time. Additionally, there remains a need for a releasable fastener capable of accommodating even thinner plates and narrower holes Existing innovations have made strides in reducing wear and improving compatibility with thinner plates, yet they have not fully addressed the constraints posed by exceedingly thin materials or narrow fastener holes.

[0007] The primary objective of the present invention is to overcome the limitations of existing one-sided bolt systems by providing a releasable fastener specifically tailored to address the challenges associated with thin plates, narrow holes and preventing localized wear over time.Summary of the Invention

[0008] One aspect of the present invention relates to a releasable fastener assembly. A releasable fastener assembly may be understood as a mechanism designed for securing an object to a structure while maintaining the ability to release and reposition it.

[0009] The locking component is a crucial part of this arrangement, comprising a first portion, a second portion, and a central opening. It also includes a front portion in an initial position defined by a first orientation adapted to be received by the first portion, an end portion for receiving by the front portion through the central opening such that rotation of the end portion in a first direction causes the front portion to disengage from the first portion and to rotate into a transitional position substantially transverse to the first orientation until it is retained within the first portion, and further rotation of the endportion in the same direction causes the front portion to move axially towards the structure thereby clamping the object to the structure.

[0010] In summary, one aspect of the present invention provides a releasable fastener assembly that offers ease of use, secure connection, and versatility through its locking component's ability to disengage, rotate, and clamp while maintaining a compact design.

[0011] According to various embodiments, a rotation of the end portion in a second direction opposed to the first direction causes the front portion to be released from the final position and rotated from the second orientation to the first orientation substantially transverse to the second orientation in the first position thereby facilitating removal of the object from the structure.

[0012] According to various embodiments, the front portion has a length and a width, and a threaded opening extending through its central axis for receiving the locking component and the end portion.

[0013] According to various embodiments, the front portion is an elongate nut having a threaded opening extending through its central axis for receiving the locking component and the end portion.

[0014] According to various embodiments, the front portion is a bolt having an elongate head and a threaded shank adapted to be received by the locking component and the end portion.

[0015] According to various embodiments, the first portion includes a first protrusion and a second protrusion extending from the second portion, wherein the first protrusion and the second protrusion includes a space therebetween adapted to receive the front portion in the final position.|00161 According to various embodiments, each of the first protrusion and the second protrusion includes an extension extending upwardly from each protrusion, wherein the extensions include a space therebetween adapted to receive the front portion in the first position.

[0017] According to various embodiments, each extension has an inner face facing inwardly to the central opening, wherein the inner face is radially curved.

[0018] According to various embodiments, the first orientation is when the front portion has its length substantially parallel to its longitudinal axis.

[0019] According to various embodiments, the second orientation is when the front portion has its length substantially transverse to its longitudinal axis.

[0020] According to various embodiments, the front portion has two radially curved surfaces at each diagonally opposed end, wherein each radially curved surface is dimensioned to fit the inner face of the extension in the first position.

[0021] According to various embodiments, the end portion is a bolt comprising a head and a threaded shank.

[0022] According to various embodiments, the end portion is a nut having a threaded opening for receiving the threaded shank.

[0023] According to various embodiments, the second portion includes a base dimensionally bigger than an opening of the object such that the base includes a face that abuts an outer face of the opening thereby clamping the object to the structure when in the final position.

[0024] A second aspect of the present invention relates to a method for securing an object to a structure. This arrangement may be understood as a technique that enables reliable andefficient attachment or detachment of objects to structures using a releasable fastener assembly.

[0025] The releasable fastener assembly refers to a mechanism designed specifically for cooperating with both the object and the structure during securing operations. It comprises a locking component, which includes a first portion, a second portion, and a central opening. The releasable fastener assembly includes a front portion in an initial position defined by a first orientation that can be received by the first portion. The releasable fastener assembly also includes an end portion forming a complementary piece for receiving by the front portion through the central opening during operation.

[0026] It may be provided that the method begins with inserting both the front portion and a first portion of the locking component into the respective openings on the object and structure. This allows proper alignment and engagement between the components, ensuring a secure connection.

[0027] The end portion can then be rotated in a first direction to cause the front portion to disengage from the first portion and move into a transitional position substantially perpendicular to it until it is retained within the first portion. The method further includes rotating the end portion in the first direction to cause the front portion to move axially towards the structure thereby clamping the object to the structure. This action secures the connection between the object and structure.

[0028] One advantage of this arrangement is the ability to quickly attach or detach objects from structures without requiring additional tools, thus saving time and effort in various applications. The design also ensures a secure connection while minimizing potential damage to both components due to its reversible locking mechanism.

[0029] According to various embodiments, a rotation of the end portion in the second direction causes the front portion to be released from the final position and moved axially away from the structure, and further rotation causes the front portion to be rotated fromthe second orientation to the first orientation substantially transverse to the second orientation in the first position thereby facilitating removal of the object from the structure.

[0030] According to various embodiments, the front portion has a length and a width, and a threaded opening extending through its central axis for receiving the locking component and the end portion.

[0031] According to various embodiments, the front portion is an elongate nut having a threaded opening extending through its central axis for receiving the locking component and the end portion.

[0032] According to various embodiments, the front portion is a bolt having an elongate head and a threaded shank adapted to be received by the locking component and the end portion.

[0033] According to various embodiments, the first portion includes a first protrusion and a second protrusion extending from the second portion, wherein the first protrusion and the second protrusion includes a space therebetween adapted to receive the front portion in the final position.

[0034] According to various embodiments, each of the first protrusion and the second protrusion includes an extension extending upwardly from each protrusion, wherein the extensions include a space therebetween adapted to receive the front portion in the first position.

[0035] According to various embodiments, each extension has an inner face facing inwardly to the central opening, wherein the inner face is radially curved.

[0036] According to various embodiments, the first orientation is when the front portion has its length substantially parallel to its longitudinal axis.

[0037] According to various embodiments, the second orientation is when the front portion has its length substantially transverse to its longitudinal axis.

[0038] According to various embodiments, the front portion has two radially curved surfaces at each diagonally opposed end, wherein each radially curved surface is dimensioned to fit the inner face of the extension in the first position.

[0039] According to various embodiments, the end portion is a bolt comprising a head and a threaded shank.

[0040] According to various embodiments, the end portion is a nut having a threaded opening for receiving the threaded shank.

[0041] According to various embodiments, the second portion includes a base dimensionally bigger than an opening of the object such that the base includes a face that abuts an outer face of the opening thereby clamping the object to the structure when in the final position.Brief Description of the Drawings

[0042] In the drawings, like reference characters generally refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. The dimensions of the various features or elements may be arbitrarily expanded or reduced for clarity. In the following description, various embodiments of the invention will be better understood with reference to the detailed description when considered in conjunction with the non-limiting examples and the accompany drawings, in which:100431 Figure la illustrates an exploded sectional view of a releasable fastener assembly for securing a wear liner to a structure according to various embodiments;

[0044] Figure lb illustrates an exploded view of a releasable fastener assembly for securing a wear liner to a structure according to various embodiments;

[0045] Figure 2a illustrates a top view of the releasable fastener assembly for securing a wear liner to a structure according to various embodiments;

[0046] Figure 2b illustrates a side view of the releasable fastener assembly for securing a wear liner to a structure according to various embodiments;

[0047] Figure 3a shows a top view of a front portion of a releasable fastener assembly according to various embodiments;

[0048] Figure 3b shows a side sectional view of a front portion of a releasable fastener assembly according to various embodiments;

[0049] Figure 3c shows a perspective view of a front portion of a releasable fastener assembly according to various embodiments;

[0050] Figure 4a shows a perspective view of an end portion of a releasable fastener assembly according to various embodiments;

[0051] Figure 4b shows a side view of an end portion of a releasable fastener assembly according to various embodiments;

[0052] Figure 5a shows a perspective view of a locking component of a releasable fastener assembly according to various embodiments;

[0053] Figure 5b shows a top view of a locking component of a releasable fastener assembly according to various embodiments;

[0054] Figure 5c shows a side sectional view of a locking component of a releasable fastener assembly according to various embodiments;

[0055] Figure 6a shows a perspective view of a support frame for a locking component of a releasable fastener assembly according to various embodiments;

[0056] Figure 6b shows a top view of a support frame for a locking component of a releasable fastener assembly according to various embodiments;

[0057]

[0058] Figure 7a shows a perspective sectional view of a releasable fastener assembly in a final position for securing a wear liner to a structure according to various embodiments;100591 Figure 7b shows a perspective view of a releasable fastener assembly in a final position for securing a wear liner to a structure according to various embodiments;

[0060] Figure 7c shows a rear view of a releasable fastener assembly in a final position for securing a wear liner to a structure according to various embodiments;

[0061] Figure 7d shows a side view of a releasable fastener assembly in a final position for securing a wear liner to a structure according to various embodiments;

[0062] Figure 8a shows a perspective view of another releasable fastener assembly in a pre-installation position for securing a wear liner to a structure according to various embodiments;

[0063] Figure 8b shows a top view of another releasable fastener assembly in a preinstallation position for securing a wear liner to a structure according to various embodiments;

[0064] Figure 9 shows a perspective view of another releasable fastener assembly for securing a wear liner to a structure according to various embodiments;

[0065] Figure 10a shows a side view of another releasable fastener assembly in an installation position for securing a wear liner to a structure according to various embodiments;

[0066] Figure 10b shows a top view of another releasable fastener assembly in an installation position for securing a wear liner to a structure according to various embodiments,

[0067] Figure 1 la shows a perspective view of another releasable fastener assembly in a final position according to various embodiments;

[0068] Figure 1 lb shows a rear view of another releasable fastener assembly in a final position according to various embodiments;

[0069] Figure 12a shows a perspective view of an end portion of a releasable fastener assembly according to various embodiments;

[0070] F igure 12b shows a side view of a front portion of a releasable fastener assembly according to various embodiments;

[0071] Figure 12c shows a top view of a front portion of a releasable fastener assembly according to various embodiments;|0072| Figure 13a shows a perspective view of an end portion of a releasable fastener assembly according to various embodiments;

[0073] Figure 13b shows a top view of an end portion of a releasable fastener assembly according to various embodiments; and

[0074] F igure 13c shows a side sectional view of an end portion of a releasable fastener assembly according to various embodiments.Detailed Description

[0075] Reference will now be made in detail to an exemplary embodiment of the present invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the embodiment, it will be understood that they are not intended to limit the invention to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications, and equivalents, which may be included within the spirit and scope of the invention as defined by the appended description. Furthermore, in the following detailed description of embodiments of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be recognized by one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the embodiments of the present invention.

[0076] In the specification the term “comprising” shall be understood to have a broad meaning similar to the term “including” and will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. This definition also applies to variations on the term “comprising” such as “comprise” and “comprises”.

[0077] In the specification, the term “engage” and its variants including “engagement”, “engages”, “engaging” and “engaged” as used herein are to be interpreted to includeengagement by touching, .rubbing or abutting including engagement in one or more of an axial, radial, tangential and circumferential direction, and includes engagement through an intermediary such as a component positioned or sandwiched between the e.g. counter face and head of the blind-sided fastener.

[0078] Throughout the specification and claims, the following terms take the meanings explicitly associated herein, unless the context clearly dictates otherwise. The phrase “in one embodiment” as used herein does not necessarily refer to the same embodiment, though it may. Furthermore, the phrase “in another embodiment” as used herein does not necessarily refer to a different embodiment, although it may. Thus, as described below, various embodiments of the invention may be readily combined, without departing from the scope or spirit of the invention.

[0079] Certain terminology used in the description is for convenience in reference only and shall not be limiting. For example, up, down, front, back, right, and left refer to the disclosed subject matter as orientated in the view being referred to. The words, “inwardly”, “inner”, “outwardly” and “outer” refer to directions toward and away from, respectively, the geometric center of the aspect being described and designated parts thereof. The terminology will include the words specifically mentioned, derivatives thereof, and words of similar meaning. Like references numbers denote like features, components, or elements throughout the various embodiments.

[0080] In addition, as used herein, the term “or” is an inclusive “or” operator, and is equivalent to the term “and / or,” unless the context clearly dictates otherwise. The term “based on” is not exclusive and allows for being based on additional factors not described, unless the context clearly dictates otherwise. In addition, throughout the specification, the meaning of “a, ”an,” and “the” include plural references. The meaning of “in” includes “in” and “on.”

[0081] Features that are described in the context of an embodiment may correspondingly be applicable to the same or similar features in the other embodiments.Features that are described in the context of an embodiment may correspondingly be applicable to the other embodiments, even if not explicitly described in these other embodiments. Furthermore, additions and / or combinations and / or alternatives as described for a feature in the context of an embodiment may correspondingly be applicable to the same or similar feature in the other embodiments.

[0082] To achieve the stated features, advantages and objects, the present invention is directed to a releasable fastener assembly for a blind-sided bolt system.

[0083] As will be understood in the below discussion, the present invention aims to address the shortcomings by overcoming the limitations of existing one-sided bolt systems by providing a releasable fastener specifically tailored to address the challenges associated with thin plates, narrow holes and preventing localized wear.

[0084] The present invention aims to address the aforementioned problems by reversing the fastener assembly configuration by relocating the nut to the back wall of the structure. This strategic adjustment significantly reduces the size of the fastener hole in the wear liner and mitigates the risk of localized wear and enhancing the longevity of the system. Furthermore, this fastener assembly offers enhanced suitability for thinner plates. In scenarios where utilizing a nut on the front face is impractical due to minimum thread engagement requirements, the relocation of the nut to the back wall proves advantageous. The present invention ensures compatibility with thinner plates, where traditional nut arrangements may present prohibitive challenges.

[0085] The technical advantages offered by the present invention are as follows:• Enhanced Versatility: The present invention provides a one-sided releasable fastener that is adaptable to thin plates and narrow holes. This increased adaptability expands the range of applications for which the fastener can be utilized, offering versatility across various engineering scenarios.• Improved Compatibility: By relocating the nut to the back wall of the structure, the fastener overcomes the limitations posed by traditional configurations, particularly in cases where minimum thread engagement is required on the front face of thin plates. This improved compatibility ensures that the fastener can be effectively employed even in situations where conventional nut arrangements would be impractical or prohibitive.• Reduced Wear: The strategic adjustment in the fastener assembly serves to minimize the size of the fastener hole in the wear liner. By doing so, the solution mitigates the risk of localized wear over time, thereby enhancing the longevity and durability of the system. This reduction in wear contributes to prolonged operational efficiency and reduced maintenance requirements.• Streamlined Assembly Process: The novel configuration of the fastener facilitates efficient assembly and disassembly processes. Its one-sided design simplifies installation procedures, allowing for quicker and more straightforward attachment of components. This streamlined assembly process not only saves time but also enhances overall operational efficiency• Optimized Performance: By addressing the limitations of traditional one-sided bolt systems, the proposed solution optimizes the performance of fastening mechanisms in engineering applications. Its ability to accommodate thin plates and narrow holes while minimizing wear ensures reliable and robust performance in diverse operating environments.

[0086] Figures la and lb show an exploded sectional view and an exploded view respectively of a releasable fastener assembly for securing a wear liner to a structure according to various embodiments. Figures 2a and 2b show a top view and a side view respectively of the releasable fastener assembly for securing a wear liner to a structure according to various embodiments. With reference to the aforesaid figures, a releasable fastener assembly 200 for securing a wear liner or an object to a structure 10 is shown.Throughout the specification, the structure 10 may include any piece of machinery or equipment where a surface of the structure is exposed to wear. For example, the structure 10 can be a transfer chute where only the inside surface is accessible by an operator. The structure 10 has a first surface 14 that is typically concealed and not readily accessible during wear liner replacement. The first surface 14 is either not accessible or can only be accessed by setting up a scaffolding or using an access equipment. The structure 10 also has a second surface 12 against which the wear liner or wear plate 60 is mounted on. The wear liner 60 includes a liner opening 66 therethrough to facilitate mounting the wear liner 60 the structure 10. The structure 10 has at least a mounting opening 16 that is aligned with the liner opening 66 to receive the releasable fastener assembly for securing the wear liner 60 to the structure 10. According to various embodiments, the releasable fastener assembly 200 is specifically designed to secure the wear liner 60 to the structure 10. The releasable fastener 200 allows the wear liner 60 to be easily installed and removed as and when desired.

[0087] Figures 3a-c show a top view, a side sectional view and a perspective view respectively of a front portion of a releasable fastener assembly according to various embodiments. The releasable fastener 200 comprises a front portion 210, a locking component 220 and an end portion 230. In an embodiment, the front portion 210 is an elongate nut that has a length L that is longer than its width W. The elongate nut has an upper surface and a bottom surface. The front portion 210 has a threaded aperture 212 extending therethrough along its central axis XX for receiving the end portion 230. The front portion 210 includes a radially curved surface at each corner of the front portion 210. While all four corners of the elongate are radially curved, the radially curved surface at three corners is more pronounced and is of a greater radius than the curved surface at the remaining corner. By having the radially curved surfaces at three corners that is of a greater radius than the remaining corner, this keeps the front portion in a relatively fixed position in the pre-installation and installation position. It also serves to prevent the front portion from rotating in the opposed direction (anti-clockwise direction) when in the preinstallation position and installation position. The more pronounced radially curved surfaces at the three corners also allow the front portion to rotate smoothly into the finalposition from an initial position (at installation position) and vice versa. The mounting opening 16 is dimensioned to fit the width W of the front portion 210 to be inserted through the mounting opening 16. In the initial position, the front portion 210 is in a first orientation defined when the length of the front portion is substantially parallel to its longitudinal axis, or its length is oriented at 0 degrees with respect to its longitudinal axis.

[0088] Figures 4a and 4b shows a perspective view and a side view of an end portion of a releasable fastener assembly according to various embodiments. In an embodiment, the end portion 230 is a bolt having a head 232 and a threaded shank 231. The end portion 230 has a threaded shank 231 extending through its central axis. The threaded shank 231 is adapted to be received through the central opening of the locking component and received by the threaded aperture 212 of the front portion 210 in order to fasten the wear liner 60 to the structure 10. In order to affix the wear liner 60 to the structure 10, the head of the end portion 230 includes a tool recess configured to engage with a fastening tool for tightening the end portion 230. In some embodiments, the fastening tool can be an impact gun, socket wrench or spanner. When the end portion 230 is rotated in a first direction, for example, a clockwise direction by the fastening tool, due to the resistive engagement between the threaded shank 231 of the end portion 230 and the threaded aperture 212 of the front portion 210, the front portion 210 is caused to disengage from the locking component and to rotate in the first direction from the initial position in the first orientation to a final position in a second orientation.

[0089] Figures 5a-5c show a perspective view, a top view, and a side sectional view of a locking component of a releasable fastener assembly according to various embodiments. The locking component 220 includes a first portion 221 and a second portion 222. The first portion 221 includes the upper section of the locking component 220 and is dimensioned to extend through the liner opening 66 and the structure opening 16. The first portion 221 extends from the second portion 222 which includes a base and a central opening 224 through a central axis of the base. In some embodiments, the base is, but not limited to, a cylindrical shape. The second portion 222 is dimensionally larger than the first portion 221since it is designed not to extend through the liner opening 66. The base has an upper surface 225 that abuts against the inner surface of the liner opening 66.

[0090] In various embodiments, the first portion 221 has two protrusions 227,228 extending from the top surface 225 of the second portion 222. In an embodiment, the first portion 221 includes a first protrusion 227 and a second protrusion 228 where each protrusion extends from the second portion 222, and each protrusion 227, 228 is at least substantially identical to each other. The term “at least substantially identical” is to be understood to mean in particular that the protrusions have an identical shape and preferably an identical size apart from deviations caused by the manufacturing process. Each protrusion 227, 228 is located on opposing sides of the base or on opposing sides of the central opening 224. Each protrusion 227, 228 has a top surface from which an extension projects from the top surface of the protrusion 227, 228. In some embodiments, the top surface is flat, sloping or a combination of flat and sloping. Each extension includes an inner surface 223 and an outer surface 229 The inner surface 223 faces inwardly to the central opening 224. The inner surface 223 of the extension faces the inner surface 223 of the other opposing extension. In an embodiment, the inner surface 223 and the outer surface 229 are curved. In some embodiments, the extension has a half crescent moon shape when viewed from the top. The inner surfaces 223 of the extensions are radially curved in order to accommodate the radially curved surfaces of the front portion 210 so that it can receive the front portion 210 in the pre-installation and installation position, details of which will be explained later. In other words, the radius of the inner surface 223 is at least the same radius as the radius of the radially curved surface of the three corners of the front portion 210. In various embodiments, the protrusions 227, 228 also include inner surfaces that are adapted to receive the front portion 210 between the protrusions 227, 228 when the front portion 210 is in the final position in the second orientation.

[0091] Figures 6a and 6b show a perspective view and a top view of a support frame adapted for a locking component of a releasable fastener assembly according to various embodiments. The support frame 215 is configured for attachment to the locking component in order to provide a resistive force to the front portion 210 as it is disengagedfrom the locking component. It also provides a resistive force where there is no back wall in the mounting opening 10 and acts as a back wall for the releasable fastener assembly as it is being rotated from the installation position to the final position. The locking component 220 has extensions protruding from the first protrusion and the second protrusion. Each extension includes a threaded opening for receiving a bolt to fasten the support frame 215 to the extensions. The support frame 215 includes two openings 218 on each opposed end of the support frame 215. The two openings extend through the support frame 215 and are aligned with the threaded openings of the extensions of the locking component. Any standard bolts can be used to fasten the support frame 215 to the extensions.

[0092] Referring to Figures 1a and 1 b which shows a releasable fastener assembly in a pre-installation position in an exploded view, the pre-installation position is a position where an installer who wishes to secure the wear liner to the structure with a fastening tool is in a ready position to insert the releasable fastener assembly 200 into the liner opening 66 of the wear liner 60 and into the mounting opening 16 of the structure 10. In the preinstallation position, the support frame 215 is secured to the extensions of the locking component 220 and the front portion 210 is received by the inner surfaces 223 of the extensions central opening of the central portion 220 In some embodiments, the preinstallation position made up of the front portion 210 and the locking component 220 with the support frame 215.

[0093] When the wear liner 60 is lifted into position, for example, by a lifting system, that positions the wear liner into the installation position, i.e. where the liner opening 66 and the mounting opening 16 are aligned, the installer simply inserts the front portion 210 and the locking component 220 into the liner opening 66 and the mounting opening 16 into the installation position. The installation position is a position where a part of the releasable fastener assembly 200 is inserted into the mounting opening 16 of the structure 10. In the installation position, the front portion 210 is oriented horizontally (i.e., its length L is oriented at 0 degrees with respect to its longitudinal axis) which is the same position as the pre-installation position. The second portion 222 of the locking component 220 remains within the liner opening 66. The installer then inserts the end portion 230 into the lineropening 66 and screws the end portion 230 into the threaded aperture of the front portion 210. In this initial position, the front portion 210 is in a first orientation where its length L is substantially parallel to its longitudinal axis. In other words, the elongate nut (front portion) should be located within the extensions of the protrusions, or within the half crescent moon shaped extensions. Additionally, at least two corners of the radially curved surfaces of the elongate nut are received by the inner surfaces of the extensions, or within the half crescent moon shaped extensions. The purpose of the radially curved surfaces of the front portion is to keep the front portion in a relatively fixed position in the preinstallation position and installation position. In various embodiments, the releasable fastener assembly 200 is sold in the pre-installation position so that it is ready for the installer to immediately fit the fastening tool on to the end portion for immediate installation of the wear liner without having to adjust any components of the releasable fastener. This provides the advantage of efficient and quick fitment of the wear liners in operation.

[0094] Figures 7a-7d show a perspective sectional view, a perspective view, a rear view and a side view respectively of a releasable fastener assembly in a final position according to various embodiments. The final position is a position where the wear liner 60 is secured and clamped to the structure 10. In order to secure the wear liner 60 to the structure 10 from the installation position, the installer will have to tighten the end portion by using the fastening tool. When the end portion is rotated in a first direction, for example, a clockwise direction, due to the resistive engagement between the threaded shank of the end portion 230 and the threaded aperture of the front portion 210, the front portion 210 is caused to rotate in the same direction from the installation position to a final position. This in turn causes the front portion 210 to disengage from the locking component 220 and pushed against the support frame 215. The support frame 215 provides a resistive force against the front portion 210 as the end portion is further rotated by the fastening tool. Further rotation of the end portion 230 in the same first direction causes the front portion 210 to rotate itself into a second orientation that is substantially transverse to the first orientation. When it has rotated into the second orientation, i.e., with its length at approximately 90 degrees with respect to its longitudinal axis, this will cause the front portion 210 to be moved axially ordisplaced towards the end portion, resulting in the front portion 210 to be moved axially or displaced towards the locking component 220 and in between the protrusions 227, 228 such that the inner surfaces of the protrusions 227, 228 are facing the length L of the front portion 210. Further tightening of the end portion 230 will cause the front portion 210 to be moved axially or displaced towards an inner surface of the mounting opening 16 to abut the front portion against the inner surface of the mounting opening 16 thereby providing the clamping force of the wear liner 60 on the structure 10. At the same time, the front portion 210 is caused to be retained within the protrusions 227, 228 of the locking component, thereby clamping the wear liner 60 to the structure 10. In other words, the front portion 210 is retained within the inner surfaces of the two protrusions. When the front portion 210 is retained within the protrusions, it is prevented from rotational displacement in both clockwise and anti-clockwise directions and remains in the final position for the service life of the wear liner. This provides the advantage of minimal loosening of the front portion (i.e. bolt) even if the end portion loosens over time.

[0095] To release the fastener assembly 200 from its final position, in the case where the wear liner needs to be removed for replacement, the steps are reversed, i.e. from the final position to the installation position, and removal from the plates. The end portion is loosened using the fastening tool by rotating the fastening tool in a second direction, for example, an anti-clockwise direction. This will cause the front portion 210 to be displaced away from the inner surface of the mounting opening 16. At the same time, the front portion 210 is displaced away from the protrusions of the locking component. This causes the front portion to be loosened from the clamping force of the wear liner 60 on the structure 10. Once the front portion 210 is no longer retained within the protrusions, further anticlockwise rotation of the end portion will cause the front portion 210 to be rotated from the second orientation (,i.e. with its length L at approximately 90 degrees with respect to its longitudinal axis) to the first orientation (, i.e. with its length at 0 degrees with respect to its longitudinal axis) to the installation position. At this point, the wear liner 60 is loosened from the structure 10 and the installer can easily remove the wear liner and the releasable fastener assembly 200 from the liner opening 66 for replacement of the wear liner 60.100961 Figures 8a, 8b and 9 show a perspective view, a side view and an exploded perspective view of another releasable fastener assembly in a pre-installation position for securing a wear liner to a structure according to various embodiments. With reference to the aforesaid figures, a releasable fastener assembly 200 for securing a wear liner or an object (not shown for illustration purposes) to a structure 10 is shown. The wear liner 60 includes a liner opening 66 therethrough to facilitate mounting the wear liner 60 the structure 10. The structure 10 has at least a mounting opening 16 that is aligned with the liner opening 66 to receive the releasable fastener assembly for securing the wear liner 60 to the structure 10. According to various embodiments, the releasable fastener assembly 200 is specifically designed to secure the wear liner 60 to the structure 10. The releasable fastener 200 allows the wear liner 60 to be easily installed and removed as and when desired. The releasable fastener assembly 200 comprises a front portion 210, a locking component 220 and an end portion 230. The locking component 220 together with the support frame 215 are the same as the previous embodiments and will not be further detailed. In this embodiment, the front portion 210 is a bolt having an elongate head and a threaded shank and the end portion 230 is a nut. In order to affix the wear liner 60 to the structure 10, the end portion 230 includes tool recesses configured to engage with a fastening tool for tightening the end portion 230. In some embodiments, the fastening tool can be an impact gun, socket wrench or spanner. The pre-installation position is a position where an installer who wishes to secure the wear liner to the structure with a fastening tool is in a ready position to insert the releasable fastener assembly 200 into the liner opening 66 of the wear liner 60 and into the mounting opening 16 of the structure 10. In the preinstallation position, the support frame 215 is secured to the extensions of the locking component 220 and the front portion 210 is received by the inner surfaces 223 of the extensions central opening of the central portion 220 In some embodiments, the preinstallation position made up of the front portion 210 and the locking component 220 with the support frame 215.

[0097] Figures 10a and 10b show a side view and a top view respectively of another releasable fastener assembly in an installation position for securing a wear liner to a structure according to various embodiments. When the wear liner 60 is lifted into position, for example, by a lifting system, that positions the wear liner 60 into the installationposition, i.e. where the liner opening 66 and the mounting opening 16 are aligned, the installer simply inserts the front portion 210 and the locking component 220 into the liner opening 66 and the mounting opening 16 into the installation position. The installation position is a position where a part of the releasable fastener assembly 200 is inserted into the mounting opening 16 of the structure 10. In the installation position, the front portion 210 is oriented horizontally (i.e., its length L is oriented at 0 degrees with respect to its longitudinal axis) which is the same position as the pre-installation position. The second portion 222 of the locking component 220 remains within the liner opening 66. The installer then inserts the end portion 230 into the liner opening 66 and rotates the end portion 230 into the threaded shank of the front portion 210. In this initial position, the front portion 210 is in a first orientation where its length L is substantially parallel to its longitudinal axis. In other words, the elongate head (of the front portion) should be located within the extensions of the protrusions, or within the half crescent moon shaped extensions. Additionally, two corners of the radially curved surfaces of the elongate head are received by the inner surfaces of the extensions, or within the half crescent moon shaped extensions. The purpose of the radially curved surfaces of the front portion is to keep the front portion in a relatively fixed position in the pre-installation position and installation position. Tn various embodiments, the releasable fastener assembly 200 is sold in the preinstallation position so that it is ready for the installer to immediately fit the fastening tool on to the end portion for immediate installation of the wear liner without having to adjust any components of the releasable fastener. This provides the advantage of efficient and quick fitment of the wear liners in operation.

[0098] Figures 1 la and 1 lb show a perspective view and a rear view respectively of a releasable fastener assembly in a final position according to various embodiments. The final position is a position where the wear liner 60 (not shown) is secured and clamped to the structure 10. In order to secure the wear liner 60 to the structure 10 from the installation position, the installer will have to tighten the end portion by using a fastening tool 50. When the end portion 230 is rotated in a first direction, for example, a clockwise direction, due to the resistive engagement between the threaded opening of the end portion 230 and the threaded shank of the front portion 210, the front portion 210 is caused to rotate in the same direction from the installation position to a final position. This in turn causes the frontportion 210, or the elongate head 216, to disengage from the locking component 220 and pushed against the support frame 215. The support frame 215 provides a resistive force against the front portion 210 as the end portion 230 is further rotated by the fastening tool 50. Further rotation of the end portion 230 in the same first direction causes the front portion 210 to rotate itself into a second orientation that is substantially transverse to the first orientation. When it has rotated into the second orientation, i.e., the elongate head with its length at approximately 90 degrees with respect to its longitudinal axis, this will cause the front portion 210 to be displaced towards the end portion, resulting in the front portion 210 to be displaced towards the locking component 220 and in between the protrusions 227, 228 such that the inner surfaces of the protrusions 227, 228 are facing the length L of the front portion 210. Further tightening of the end portion 230 will cause the front portion 210 to be displaced towards an inner surface of the mounting opening 16 to abut the front portion against the inner surface of the mounting opening 16 thereby providing the clamping force of the wear liner 60 on the structure 10. At the same time, the front portion 210 is caused to be retained within the protrusions 227, 228 of the locking component, thereby clamping the wear liner 60 to the structure 10. In other words, the front portion 210 is retained within the inner surfaces of the two protrusions. When the front portion 210 is retained within the protrusions, it is prevented from rotational displacement in both clockwise and anti-clockwise directions and remains in the final position for the service life of the wear liner. This provides the advantage of minimal loosening of the front portion (i.e. bolt) even if the end portion loosens over time.[0099) Figures 12a-12c show a perspective view, a side view and a top view of a front portion of a releasable fastener assembly according to various embodiments. With reference to the aforesaid figures, the front portion 210 is a bolt that includes an elongate head 216 and a threaded shank 218. The elongate head 216 includes a planar upper surface and a bottom surface. In various embodiments, the bolt can include T-shaped bolts or other suitable types of bolts. The elongate head 216 of the bolt has a length L that is longer than its width W. The front portion 210 includes a radially curved surface at each corner of the front portion 210. While all four corners of the elongate head 216 are radially curved, the radially curved surface at two diagonally opposite comers is more pronounced and is of agreater radius than the curved surface at the remaining corners. By having the radially curved surfaces at the diagonally opposing corners of a greater radius than the remaining corners, this keeps the front portion 210 in a relatively fixed position in the pre-installation and installation position It also serves to prevent the front portion from rotating in the opposed direction (anti-clockwise direction) when in the pre-installation position and installation position. The more pronounced radially curved surfaces at the two diagonally opposing comers also allow the front portion to rotate smoothly into the final position from an initial position (at installation position) and vice versa. The mounting opening 16 is dimensioned to fit the width W of the front portion 210 to be inserted through the mounting opening 16. In the initial position, the front portion 210 is in a first orientation defined when the length of the front portion is substantially parallel to its longitudinal axis, or its length is oriented at 0 degrees with respect to its longitudinal axis.

[0100] Figures 13a-13c show a perspective view, a top view and a side view of an end portion of a releasable fastener assembly according to various embodiments. In an embodiment, the end portion 230 is a nut. The end portion 230 has a threaded opening 234 extending therethrough its central axis. The threaded opening 234 is adapted to receive through the central opening of the locking component the threaded shank 218 of the front portion 210 in order to fasten the wear liner 60 to the structure 10. The rear surface of the end portion 230, i.e. the surface facing the fastening tool 50, includes tool recesses 232 configured to be received by the fastening tool 50 for rotating the end portion 230.

[0101] While the invention has been particularly shown and described with reference to specific embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is thus indicated by the appended claims and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced.

Claims

Claims1. A releasable fastener assembly for securing an object to a structure, the releasable fastener assembly comprising: a locking component having a first portion, a second portion and a central opening; a front portion in an initial position defined by a first orientation adapted to be received by the first portion; an end portion for receiving by the front portion through the central opening such that rotation of the end portion in a first direction causes the front portion to disengage from the first portion and to rotate into a transitional position substantially transverse to the first orientation until it is retained within the first portion, and further rotation of the end portion in the same direction causes the front portion to move axially towards the structure thereby clamping the object to the structure.

2. The releasable fastener assembly according to claim 1, wherein a rotation of the end portion in a second direction opposed to the first direction causes the front portion to be released from the final position and rotated from the second orientation to the first orientation substantially transverse to the second orientation in the first position thereby facilitating removal of the object from the structure.

3. The releasable fastener assembly according to claim 1, wherein the front portion has a length and a width, and a threaded opening extending through its central axis for receiving the locking component and the end portion.

4. The releasable fastener assembly according to claim 1, wherein the front portion is an elongate nut having a threaded opening extending through its central axis for receiving the locking component and the end portion.

5. The releasable fastener assembly according to claim 1, wherein the front portion is a bolt having an elongate head and a threaded shank adapted to be received by the locking component and the end portion.

6. The releasable fastener assembly according to claim 1, wherein the first portion includes a first protrusion and a second protrusion extending from the second portion, wherein the first protrusion and the second protrusion includes a space therebetween adapted to receive the front portion in the final position7. The releasable fastener assembly according to claim 6, wherein each of the first protrusion and the second protrusion includes an extension extending upwardly from each protrusion, wherein the extensions include a space therebetween adapted to receive the front portion in the first position.

8. The releasable fastener assembly according to claim 7, wherein each extension has an inner face facing inwardly to the central opening, wherein the inner face is radially curved.

9. The releasable fastener assembly according to claim 1, wherein the first orientation is when the front portion has its length substantially parallel to its longitudinal axis.

10. The releasable fastener assembly according to claim 1, wherein the second orientation is when the front portion has its length substantially transverse to its longitudinal axis.

11. The releasable fastener assembly according to claim 8, wherein the front portion has two radially curved surfaces at each diagonally opposed end, wherein each radially curved surface is dimensioned to fit the inner face of the extension in the first position.

12. The releasable fastener assembly according to claim 1, wherein the end portion is a bolt comprising a head and a threaded shank.

13. The releasable fastener assembly according to claim 5, wherein the end portion is a nut having a threaded opening for receiving the threaded shank.

14. The releasable fastener assembly according to claim 1, wherein the second portion includes a base dimensionally bigger than an opening of the object such that the baseincludes a face that abuts an outer face of the opening thereby clamping the object to the structure when in the final position.

15. A method for securing an object having an object opening to a structure having a structure opening, comprising: providing a releasable fastener assembly adapted to cooperate with the object and the structure, wherein the releasable fastener assembly comprises: a locking component having a first portion, a second portion and a central opening; a front portion in an initial position defined by a first orientation adapted to be received by the first portion; an end portion for receiving by the front portion through the central opening; the method comprising: inserting the front portion and a first portion of the locking component through the object opening and structure opening; rotating the end portion in a first direction to cause the front portion to disengage from the first portion and to rotate into a transitional position substantially transverse to the first orientation until it is retained within the first portion; further rotating the end portion in the first direction to cause the front portion to move axially towards the structure thereby clamping the object to the structure.

16. The method according to claim 15, wherein a rotation of the end portion in the second direction causes the front portion to be released from the final position and moved axially away from the structure, and further rotation causes the front portion to be rotated from the second orientation to the first orientation substantially transverse to the second orientation in the first position thereby facilitating removal of the object from the structure.

17. The method according to claim 15, wherein the front portion has a length and a width, and a threaded opening extending through its central axis for receiving the locking component and the end portion.

18. The method according to claim 15, wherein the front portion is an elongate nut having a threaded opening extending through its central axis for receiving the locking component and the end portion.

19. The method according to claim 15, wherein the front portion is a bolt having an elongate head and a threaded shank adapted to be received by the locking component and the end portion.

20. The method according to claim 15, wherein the first portion includes a first protrusion and a second protrusion extending from the second portion, wherein the first protrusion and the second protrusion includes a space therebetween adapted to receive the front portion in the final position.

21. The method according to claim 20, wherein each of the first protrusion and the second protrusion includes an extension extending upwardly from each protrusion, wherein the extensions include a space therebetween adapted to receive the front portion in the first position.

22. The method according to claim 21, wherein each extension has an inner face facing inwardly to the central opening, wherein the inner face is radially curved.

23. The method according to claim 15, wherein the first orientation is when the front portion has its length substantially parallel to its longitudinal axis.24 The method according to claim 15, wherein the second orientation is when the front portion has its length substantially transverse to its longitudinal axis.

25. The method according to claim 22, wherein the front portion has two radially curved surfaces at each diagonally opposed end, wherein each radially curved surface is dimensioned to fit the inner face of the extension in the first position.

26. The method according to claim 15, wherein the end portion is a bolt comprising a head and a threaded shank.27 The method according to claim 19, wherein the end portion is a nut having a threaded opening for receiving the threaded shank.

28. The method according to claim 15, wherein the second portion includes a base dimensionally bigger than an opening of the object such that the base includes a face that abuts an outer face of the opening thereby clamping the object to the structure when in the final position.

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