Wear member retention assembly

Abstract

A wear member retention assembly for retaining a wear member to a structure includes a retainer and a key. The holder has an aperture with at least one passage. The key has a first end engageable with the retainer. The first end has at least one protrusion that can be received by at least one channel. The key comprises a key rod and a key head. The key head is attachable to the key rod. The wear member retaining assembly has an unlocked position in which the key is removable from the retainer, and a locked position in which the key is releasable from the retainer. In the locked position, the first end of the key is engaged with the retainer. The first end of the key is movable relative to the holder from an unlocked position to a locked position. When the wear member retention assembly is in the locked position, the key head attaches to the key bar and the key head abuts a portion of the wear member.

Description

Technical Field

[0001] The present invention relates to a wear member retaining assembly for retaining a wear member to a structure. The present invention applies specifically but not exclusively to fixing a wear liner to the wall of a hopper or chute of a material processing apparatus. This patent specification describes such use, but it is only an example, and the present invention is not limited to such use. Background Art

[0002] Structures used in material handling or processing, such as hoppers or chutes, are typically fitted with wear members to protect the structure from damage or deterioration caused by abrasion. Wear members are particularly suitable for situations where the structure is used to handle highly abrasive materials, or in processes with high material flow rates, the latter of which can cause sliding abrasion.

[0003] The wear member includes a plate or liner having wear resistance and / or anti-wear properties. The wear member is typically made of metal, ceramic, polyurethane, or rubber. The wear member is usually a sacrificial element that takes the wear in place of the structure. The sacrificial wear member needs to be replaced regularly.

[0004] The wear member is fastened or otherwise attached to the surface of the structure. Typically, this is achieved by connecting the wear member to the structure with bolt and nut fasteners, or by welding the wear member to the structure.

[0005] Prior art fasteners include: bolts, cam nuts having a laterally elongated shape, and large cap nuts. The cam nut is attached to one end of the bolt and inserted through a hole in the wear plate and a slot in the structure. The cam nut is rotated so that it does not pass through the slot and is pulled back to abut against and bear against the structure. Then, the cap nut is attached to the other end of the bolt and typically tightened against the wear plate to clamp the wear plate to the structure. However, these fasteners may be improperly installed because rotation of the fastener may re-align the cam nut with the slot, such that the fastener is not in a lockable position, and when the fastener is screwed into the wear plate, the fastener is not properly clamped to the structure. The cap nut may be attached to the bolt before the fastener is inserted through the hole in the wear plate and the slot in the structure. However, rotation of the fastener may cause the cam nut to jam prematurely and not rotate fully into the locked position, resulting in an unstable cam nut and prone to disengaging.

[0006] Object of the Invention

[0007] The object of the present invention is to overcome or at least alleviate one or more of the above problems of the prior wear member fasteners and / or to provide a useful or commercial alternative for consumers. Summary of the Invention

[0008] In one aspect, the present invention is mainly related to a wear member retaining assembly for retaining a wear member to a structure, the wear member retaining assembly comprising,

[0009] a retainer having a bore with at least one passageway; and

[0010] a key, a first end of the key being engageable with the retainer, the first end having at least one projection receivable by the at least one passageway, the key including a key shank and a key head, the key head being attached to or attachable to the key shank;

[0011] wherein the wear member retaining assembly has an unlocked position and a locked position, in the unlocked position, the key is removable from the retainer, and in the locked position, the first end of the key is engaged with the retainer;

[0012] wherein the first end of the key is movable relative to the retainer from the unlocked position to the locked position;

[0013] wherein when the wear member retaining assembly is in the locked position, the key head is attached to the key shank and the key head abuts against a portion of the wear member.

[0014] In a preferred embodiment, the key head is attachable to the key shank.

[0015] In a preferred embodiment, when the wear member retaining assembly is in the locked position, the first end of the key is prohibited from moving. Preferably, when the wear member retaining assembly is in the locked position, the first end of the key is prohibited from moving inadvertently. More preferably, when the wear member retaining assembly is in the locked position, the key can only be moved to the unlocked position by applying torque.

[0016] Preferably, the passageway has at least one first portion. Preferably, in the unlocked position, the at least one projection is aligned with the at least one first portion of the passageway.

[0017] In one embodiment, the structure is a wall. In another embodiment, the structure is a silo. In yet another embodiment, the structure is a panel of the silo. In another embodiment, the structure is a chute. In yet another embodiment, the structure is a panel of the chute.

[0018] In one embodiment, the chute is for conveying mined materials. In one embodiment, the chute is for conveying processed materials. In one embodiment, the chute is for conveying ore.

[0019] In one embodiment, the structure is a vehicle. In one embodiment, the vehicle is used to transport mined materials. In one embodiment, the vehicle is used to transport processed materials. In one embodiment, the vehicle is used to transport ore.

[0020] Preferably, the wear member retaining assembly can be mounted only from one side of the structure. It is advantageous that the fasteners can be mounted only from one side of the structure because this saves time and effort and / or only one side of the structure is accessible.

[0021] Preferably, the wear member retaining assembly has a longitudinal axis. Preferably, the longitudinal axis of the wear member retaining assembly is centrally located.

[0022] Preferably, the hole of the retainer is centered on the longitudinal axis. Preferably, the hole of the retainer extends in a longitudinal direction relative to the longitudinal axis.

[0023] Preferably, the first portion extends in a longitudinal direction relative to the longitudinal axis. Preferably, the first portion describes a generally straight path parallel to the longitudinal axis.

[0024] Preferably, the at least one channel has at least one second portion. Preferably, the at least one channel has at least one second portion that extends in a transverse direction relative to the longitudinal axis. Preferably, the second portion defines a generally arcuate path around the longitudinal axis.

[0025] Preferably, the at least one protrusion is positioned towards one end of the key rod. Preferably, the key rod is cylindrical.

[0026] Preferably, the hole of the retainer is a keyway for the key. Preferably, the at least one first portion leads to the hole of the retainer.

[0027] Preferably, each of the at least one first portions leads to a corresponding one of the at least one second portions.

[0028] Preferably, the key can move in a longitudinal direction relative to the longitudinal axis to be received by the retainer. Preferably, when the key is received by the retainer, the at least one protrusion enters the at least one channel.

[0029] Preferably, rotation of the key received by the retainer causes relative movement of the at least one protrusion within the second portion.

[0030] Preferably, the retainer has a first outer surface. Preferably, the hole of the retainer defines an opening in the first outer surface. In one embodiment, the first outer surface abuts the structure.

[0031] Preferably, the at least one passage further has a retaining portion. More preferably, the second portion leads to the retaining portion. Preferably, the retaining portion has a closed end. Preferably, the closed end of the retaining portion is proximal to the first outer surface of the retainer.

[0032] Preferably, the retaining portion is parallel to the first portion and extends in the same direction as the first portion. Preferably, the retaining portion extends in a longitudinal direction relative to the longitudinal axis. Preferably, the retaining portion extends such that the closed end of the retaining portion is proximal to the first outer surface of the retainer.

[0033] Preferably, when the key is positioned such that the at least one protrusion is at the end of the second portion connected to the retaining portion, the key is movable in a longitudinal direction relative to the longitudinal axis to position the at least one protrusion in the retaining portion.

[0034] Preferably, when the key is in the locked position, the at least one protrusion is within the retaining portion. More preferably, when the key is in the locked position, the at least one protrusion is within the retaining portion adjacent to the closed end.

[0035] Preferably, when the at least one protrusion is within the retaining portion, the key is prohibited from rotating about the longitudinal axis. More preferably, when the at least one protrusion is within the retaining portion, the key is prohibited from rotating about the longitudinal axis in a particular direction. Preferably, when the at least one protrusion is within the retaining portion, the key is prohibited from rotating about the longitudinal axis due to at least one wall of the at least one passage blocking movement of the at least one protrusion.

[0036] Preferably, when the key is positioned such that the at least one protrusion is in the retaining portion, the key is movable longitudinally to position the at least one protrusion in the transverse portion.

[0037] Preferably, when the key is positioned such that the at least one protrusion is within the second portion adjacent to the first portion, the key is movable longitudinally to position the at least one protrusion in the first portion. More preferably, when the key is positioned such that the at least one protrusion is within the second portion adjacent to the first portion, the key is movable longitudinally to remove the key from the retainer.

[0038] Preferably, when the key is positioned such that the at least one protrusion is within the first portion, the key is movable longitudinally to remove the key from the retainer.

[0039] In one embodiment, the first portion is tapered to assist in positioning the at least one protrusion within the passage when the key is received in the retainer. Preferably, the first portion is tapered so as to narrow towards the transverse portion.

[0040] In an alternative embodiment, the retainer has a cavity. Preferably, the cavity is connected to a hole, and the hole opens to the outer surface of the retainer.

[0041] In one embodiment, the key stem has a flange. Preferably, the flange has a diameter larger than the hole of the retainer such that the key stem is prevented from passing completely through the retainer during installation.

[0042] In one embodiment, the retainer has a cover that prevents the key or a portion of the key from being removed from the retainer by any means other than through the hole. In one embodiment, the retainer has a cover that prevents the key or a portion of the key from being removed from the retainer by any means other than through the hole.

[0043] In one embodiment, the retainer has at least one shoulder portion that prevents the key or a portion of the key from falling out of the retainer.

[0044] Preferably, the at least one channel defines an opening in the outer surface of the retainer. Preferably, the at least one channel defines an opening in the outer surface of the retainer and leads to the hole. The opening may allow dirt and debris to fall out of the retainer or otherwise be removed from the retainer for cleaning purposes.

[0045] In one embodiment, the retainer has an opening on the outer surface of the retainer that leads to the hole. The opening may allow dirt and debris to fall out of the retainer or otherwise be removed from the retainer for cleaning purposes.

[0046] In one embodiment, the at least one channel defines an opening in the outer surface of the retainer and leads to the hole, and the size of the opening is smaller than the size of the key stem. In one embodiment, the at least one channel defines an opening in the outer surface of the retainer and leads to the hole, and the size of the opening is smaller than the size of one of the at least one protrusions. This may prevent the key stem or a portion of the key stem from falling out of the retainer.

[0047] In one embodiment, the wear-resistant liner retaining assembly includes a washer. Preferably, when installed, the wear-resistant liner retaining assembly is waterproof and / or leak-proof.

[0048] In one embodiment, the retainer is attached to the structure. The retainer can be welded to the structure. The retainer can be screwed into the structure. The retainer can be fused to the structure. Preferably, the retainer can be fixed to the structure from either side of the structure.

[0049] Preferably, the retainer has a contact surface that abuts the structure.

[0050] Preferably, the key has a contact surface that contacts the wear-resistant member.

[0051] Preferably, in a case where the wear-resistant member holding assembly is used to fix the wear-resistant member to a flat sheet of a structure, the structure has a first side and a second side, the wear-resistant member is attached to the first side, and the retainer contacts the second side.

[0052] Alternatively, in a case where the wear-resistant member holding assembly is used to fix the wear-resistant member to a flat sheet of a structure, the structure has a first side and a second side, the wear-resistant member is attached to the first side, and the retainer contacts the first side.

[0053] In one embodiment, the retainer has a plurality of protrusions in the contact surface to facilitate stud welding.

[0054] In one embodiment, the retainer or a part of the retainer can be received in a hole of the structure.

[0055] Preferably, the retainer has a collar. More preferably, the retainer has an annular collar. Preferably, the retainer has an annular collar that can be received in a hole of the structure.

[0056] Preferably, the annular collar has a radially protruding lip. Preferably, the annular collar has a radially protruding lip that has a contact surface contacting the structure. More preferably, the annular collar has a lip radially protruding from the entire periphery of the annular collar. Preferably, the lip can be received in a recess of the hole of the structure.

[0057] In one embodiment, the retainer has an annular collar that can be received in a hole of the structure, the annular collar has a radially protruding lip, and the lip has a contact surface that contacts the structure on a first side of the structure.

[0058] In one embodiment, the second part has a raised section that prohibits the key from moving to the unlocking position. Preferably, when the wear-resistant member holding assembly is in the locked position, the key can move to the unlocking position by applying torque to move the at least one protrusion over the raised section.

[0059] In one embodiment, the raised section biases the key to the locked position.

[0060] In one embodiment, the second part is tapered to bias the key to the locked position.

[0061] In one embodiment, the retainer is a concave part of a bayonet fitting, and the key is a convex part of the bayonet fitting.

[0062] Preferably, the key stem has a second end. Preferably, the key head is attached to or can be attached to the second end of the key stem.

[0063] Preferably, the key head has a contact surface that abuts against the wear-resistant member.

[0064] In one embodiment, the key stem and the key head can be attached by a screw fastener. Preferably, the second end has an external thread, and the key head has a recess with an internal thread on its inner surface, and the internal thread corresponds to the external thread of the key stem.

[0065] Preferably, the at least one channel has a path that allows the key to rotate from the unlocked position to the locked position relative to the holder in one direction, and the direction of rotating the key head to connect the key head to the key stem is the same.

[0066] Preferably, the at least one channel has a path that allows the key to rotate from the locked position to the unlocked position relative to the holder in one direction, and the direction of rotating the key head to separate the key head from the key stem is the same.

[0067] In a preferred embodiment, the key stem does not extend beyond the first side of the structure.

[0068] In an alternative embodiment where the key stem extends beyond the first side of the structure, the key stem does not extend beyond a predetermined minimum useful wear-resistant member thickness.

[0069] In an alternative embodiment, the key stem is integrally formed with the key head.

[0070] Preferably, the material properties of the key are equal to or greater than those of a grade 4.6 bolt. Preferably, the material properties of the key stem are equal to or greater than those of a grade 4.6 bolt.

[0071] In one embodiment, the wear-resistant member has one or more guide rails attached to its surface. In one embodiment, the one or more guide rails are mounted on a back plate. Preferably, the back plate can be attached to the structure.

[0072] In one embodiment, the retainer is positioned within a hole in the structure by a fixing tool. Preferably, the fixing tool positions the retainer at a desired depth and holds the retainer in place to attach the retainer to the structure. In one embodiment, the fixing tool has a frame and a positioning mechanism, the frame having at least one mounting member for fixing the frame to the structure. Preferably, the positioning mechanism has a positioning key having a first end that can engage the retainer, the first end having at least one projection that can be received by at least one channel, and the positioning key being movable relative to the retainer from an unlocked position to a locked position. Preferably, the positioning key is movable relative to the frame to move the retainer to a desired position while keeping the frame stationary. Preferably, the key has a second end having a threaded portion. Preferably, the fixing tool has an adjusting nut that can be fastened to the threaded portion. Preferably, the adjusting nut is manipulated to adjust the position of the key. Preferably, the adjusting nut is a wing nut. Preferably, the at least one mounting member is magnetic. Preferably, the at least one mounting member is adjustable between an extended position and a retracted position. Preferably, the frame has a handle.

[0073] Preferably, the wear member retaining assembly is adapted to fix the wear member to the structure when the wear member retaining assembly is in a locked position. Preferably, in the locked position, the retainer abuts a portion of the structure. Preferably, in the locked position, the key engages the retainer such that one of the at least one projections is positioned within a corresponding one of the at least one channels.

[0074] Preferably, the wear member retaining assembly can be releasably engaged to fix the wear member to the structure.

[0075] Preferably, the key is movable relative to the retainer between an unlocked position and a locked position, in the unlocked position, the at least one projection is aligned with the channel, and in the locked position, the at least one projection is received within the channel.

[0076] Preferably, in the locked position, the at least one projection of the key is prohibited from rotating. More preferably, in the locked position, the at least one projection of the key is prohibited from rotating in a particular direction. More preferably, in the locked position, the at least one projection of the key is prohibited from rotating in either direction.

[0077] Preferably, the at least one projection extends radially from the key. Preferably, the at least one projection extends radially from the key transverse to the longitudinal axis of the key.

[0078] In one embodiment, the key has a pair of projections at the first end, the pair of projections being arranged to extend in opposite directions.

[0079] In one embodiment, the at least one projection is integrally formed with the key. In an alternative embodiment, the at least one projection is a separate component attached to the key, such as a pin.

[0080] In one embodiment, the at least one projection is tapered to assist in positioning the at least one projection within the channel when the key is received in the retainer.

[0081] Preferably, the key head has a first key head portion attached to the key shank and a second key head portion that abuts a portion of the wear member.

[0082] Preferably, the second key head portion is larger than the first key head portion.

[0083] In one embodiment, the key head recess has an open end and a closed end.

[0084] In one embodiment, the recess is located within the first key head portion.

[0085] In an alternative embodiment, the key head recess is a hole that extends through the entire key head. Preferably, in embodiments where the key head recess is a hole that extends through the entire key head, the hole extends through the first key head portion and the second key head portion. Preferably, in embodiments where the key head recess is a hole that extends through the entire key head, the hole is centered on a longitudinal axis.

[0086] In one embodiment, the key head has an octagonal perimeter.

[0087] In one embodiment, the key head is an octagonal nut.

[0088] In one embodiment, the wear member retaining assembly has a cap. The cap can protect the key, key shank, and / or key head from exposure to wear. The cap can protect the key, key shank, and / or key head from exposure to dirt or debris.

[0089] In a preferred embodiment, the cap is a separate component. In an alternative embodiment, the cap is integrally formed with the key. In yet another alternative embodiment, the cap is integrally formed with the key head.

[0090] In embodiments where the cap is a separate component, the cap can be attached to the key. Preferably, the cap can be attached to the key by a threaded connection. Alternatively, the cap is fused to the key. Preferably, the cap can be attached to the key head. Alternatively, the cap can be attached to the key shank.

[0091] In one embodiment, the cap has a pin that can be received within a hole in the key head. Preferably, the pin has an external thread that corresponds to the internal thread of the hole in the key head.

[0092] Preferably, in an embodiment where the key head recess is a hole extending through the entire key head and the hole extends through the first key head portion and the second key head portion, the wear member retaining assembly further includes a stopper that can be received in the hole. Preferably, the stopper prevents contact between the key stem and the pin.

[0093] Preferably, the cap is made of the same material as the wear member, or a material having a hardness greater than the hardness of the wear member.

[0094] Preferably, the cap is made of a material having an expected wear life equal to or greater than the expected wear life of the wear member.

[0095] Preferably, the cap is made of materials including but not limited to metals, ceramics, polyurethanes, polystyrenes, and rubbers.

[0096] Preferably, the cap has a generally flat outer-facing surface.

[0097] More preferably, when the wear member retaining assembly is installed, the generally flat outer-facing surface will be flush with or protrude from the outer-facing surface of the wear member.

[0098] Preferably, the cap is attached to the wear member.

[0099] Preferably, after installation, the cap should minimize indentations or dents at this location, as these indentations or dents may cause structural defects and thus uneven and / or excessive wear during use.

[0100] In an embodiment, where the structure has a through first hole, the wear member has a through second hole that has a abutting portion on its inner surface, and the wear member and the structure are positioned to align the first hole and the second hole, the key can be at least partially installed in the first hole.

[0101] Preferably, when the wear member retaining assembly is installed, the key stem is not located within the second hole.

[0102] Preferably, the retainer abuts the structure around the perimeter of the first hole.

[0103] In an embodiment, where the structure has a through first hole, the wear member has a through second hole that has a abutting portion on its inner surface, and the wear member and the structure can be positioned to align the first hole and the second hole, the key can be at least partially installed in the first hole, and the key head can be at least partially installed in the first hole and partially installable in the second hole.

[0104] Preferably, after installation, the longitudinal axis of the wear member holding assembly coincides with the center point of the first hole. Preferably, after installation, the longitudinal axis of the wear member holding assembly coincides with the center point of the second hole.

[0105] Preferably, the abutting portion of the second hole is conical, and the key has a corresponding conical portion that abuts against the abutting portion of the second hole. Preferably, the conical portion of the key is on the key head.

[0106] In one embodiment, the second hole has a countersunk portion. Preferably, the key has a conical portion corresponding to the countersunk portion, and after the wear member holding assembly is installed, the conical portion abuts against the countersunk portion. Preferably, the conical portion of the key is on the key head.

[0107] In an embodiment where the wear member holding assembly has a cap and the key is only partially installed to protrude into the second hole of the wear member, the cap fills the remaining volume of the second hole. In this embodiment, during use, the cap preferably must be completely worn out before the key is exposed to wear.

[0108] Preferably, the key has at least one tool fitting recess for receiving a tool.

[0109] In one embodiment, the key shank has at least one tool fitting recess for receiving a tool. In a preferred embodiment, the tool fitting recess has a hexagonal cross-section. In a preferred embodiment, the tool fitting recess has one or more tool ball brakes on the inner surface of the tool fitting recess.

[0110] Preferably, the key head has at least one tool fitting recess for receiving a tool.

[0111] Preferably, the cap has at least one tool fitting recess for receiving a tool.

[0112] Preferably, the tool is assembled into the tool fitting recess to rotate at least one component using the tool fitting recess. Preferably, a tool is used to insert the key into the retainer. Preferably, a tool is used to rotate the key. Preferably, a tool is used to withdraw the key from the retainer.

[0113] In one embodiment, the wear member holding assembly further includes a biasing member for biasing the key received within the retainer towards the locked position. Preferably, the biasing member is a spring.

[0114] In one embodiment, the wear member can be fixed to the structure using a plurality of wear member holding assemblies. In one embodiment, a square or rectangular wear member can be installed together with the wear member holding assemblies, which are arranged adjacent to each corner of the wear member.

[0115] On the other hand, the present invention broadly relates to a method of securing a wear member to a structure using a wear member retaining assembly, the wear member retaining assembly comprising,

[0116] a retainer having a bore with at least one passageway; and

[0117] a key having a first end engageable with the retainer, the first end having at least one projection receivable within the at least one passageway, the key including a shank and a head attached or attachable to the shank;

[0118] wherein the wear member retaining assembly has an unlocked position and a locked position, in the unlocked position the key is removable from the retainer, and in the locked position the first end of the key is engaged with the retainer;

[0119] wherein the first end of the key is movable relative to the retainer from the unlocked position to the locked position;

[0120] wherein the structure has a first side, a second side, and a first through-hole;

[0121] wherein the wear member has a second through-hole;

[0122] wherein the method includes,

[0123] positioning the retainer such that the bore is aligned with the first through-hole;

[0124] positioning the wear member against the first side of the structure such that the second through-hole is aligned with the first through-hole;

[0125] attaching the head of the key to the shank;

[0126] inserting the key through the second through-hole and the first through-hole to the unlocked position; and

[0127] moving the key to the locked position;

[0128] wherein when the wear member retaining assembly is in the locked position, the head of the key abuts a portion of the wear member.

[0129] Preferably, the passageway has at least one first portion. Preferably, in the unlocked position, the at least one projection is aligned with the at least one first portion of the passageway.

[0130] Preferably, during movement of the key to the locked position, a portion of the key abuts the wear member, and when the key is in the locked position and the wear member retaining assembly is tightened, the wear member retaining assembly engages the structure and the wear member in a clamping engagement.

[0131] In one embodiment, the key stem is first inserted through the second hole and the first hole to reach the unlocked position, and then the key head is attached to the key stem. Preferably, the key stem is inserted through the first hole to reach the unlocked position before positioning the wear-resistant member against the first side of the structure.

[0132] In an alternative embodiment, the key head is attached to the key stem before the key is inserted through the second hole and the first hole to reach the unlocked position.

[0133] In one embodiment, the at least one channel has a longitudinal first portion, a transverse second portion, and a retaining portion, and the key can be inserted into the retainer such that the at least one protrusion is received within the longitudinal first portion. Preferably, when the key is moved to the locked position, the key and the retainer are positioned such that the at least one protrusion moves from within the longitudinal first portion to within the transverse second portion. More preferably, when the key is moved to the locked position, the key and the retainer are positioned such that the at least one protrusion moves from within the longitudinal first portion to within the transverse second portion and then to within the retaining portion.

[0134] Preferably, rotation of the key head causes longitudinal movement of the key stem relative to the retainer. More preferably, rotation of the key head causes longitudinal movement of the key stem relative to the retainer and the wear-resistant member retaining assembly to clamp the wear-resistant member to the structure.

[0135] In one embodiment, rotating the key head to attach the key head to the key stem biases the key to the locked position.

[0136] In one embodiment in which the wear-resistant member retaining assembly has a cap, the cap is installed in the second hole after the key is in the locked position. In one embodiment, the method includes attaching the cap to the wear-resistant member.

[0137] In one embodiment in which the wear-resistant member retaining assembly has a cap, the cap is attached to the key head. Preferably, the cap is attached to the key head before the key is inserted through the second hole and the first hole to reach the unlocked position.

[0138] In one embodiment, the method further includes attaching the retainer to the structure after positioning. Preferably, the method further includes welding the retainer to the structure after positioning.

[0139] In another aspect, the present invention broadly relates to a wear-resistant member retaining assembly for retaining a wear-resistant member to a structure, the wear-resistant member retaining assembly including,

[0140] a retainer having an orifice with two channels; and

[0141] A key having a key head and a key stem, the key stem having a first end engageable with the retainer, the first end having two protrusions, each protrusion receivable within one of the two channels,

[0142] wherein each channel has a longitudinal portion, a transverse portion, and a retaining portion;

[0143] wherein each channel leads to the hole;

[0144] wherein the retainer has an abutment surface that abuts the structure;

[0145] wherein the key head has an abutment surface that abuts the wear member;

[0146] wherein the retainer has a cover that prevents the key or a part of the key from being removed from the retainer by any means other than through the hole; and

[0147] wherein the key is movable relative to the retainer from an unlocked position to a locked position, in which unlocked position each protrusion is aligned with one of the portions of the channel.

[0148] In another aspect, the present invention broadly relates to a method of holding a wear member to a structure using a wear member holding assembly, the wear member holding assembly including,

[0149] a retainer having an aperture with two channels; and

[0150] a key having a key head and a key stem, the key stem having a first end engageable with the retainer, the first end having two protrusions, each protrusion receivable within one of the two channels,

[0151] wherein each channel has a longitudinal portion, a transverse portion, and a retaining portion;

[0152] wherein each channel leads to the aperture;

[0153] wherein the retainer has an abutment surface that abuts the structure;

[0154] wherein the key head has an abutment surface that abuts the wear member;

[0155] wherein the retainer has a cover that prevents the key or a part of the key from being removed from the retainer by any means other than through the aperture; and

[0156] wherein the key is movable relative to the retainer from an unlocked position to a locked position, in which unlocked position each protrusion is aligned with one of the portions of the channel;

[0157] the structure having a first side, a second side, and a first through-hole;

[0158] The wear-resistant member has a through second hole;

[0159] Wherein the method includes,

[0160] Position the retainer against the second side of the structure such that the hole is aligned with the first hole;

[0161] Position the wear-resistant member against the first side of the structure such that the second hole is aligned with the first hole;

[0162] Insert the key through the second hole and the first hole to reach the unlocked position; and

[0163] Move the key to the locked position.

[0164] Preferably, during moving the key to the locked position, a portion of the key abuts against the wear-resistant member, and when the key is in the locked position and the wear-resistant member retaining assembly is tightened, the wear-resistant member retaining assembly engages the structure and the wear-resistant member in a clamping manner.

[0165] In one embodiment, the key stem is first inserted through the first hole and the second hole to reach the unlocked position, and then the key head is attached to the key stem. Preferably, the key stem is inserted through the first hole to reach the unlocked position before positioning the wear-resistant member against the first side of the structure.

[0166] In an alternative embodiment, the key head is attached to the key stem before inserting the key through the second hole and the first hole to reach the unlocked position.

[0167] Preferably, the key is inserted such that each of the protrusions is received within one of the longitudinal portions. Preferably, when the key is moved to the locked position, the key and the retainer are positioned such that each of the protrusions moves from within one of the longitudinal portions to within one of the transverse portions. More preferably, when the key is moved to the locked position, the key and the retainer are positioned such that each protrusion moves from within one of the longitudinal portions to within one of the transverse portions and then to within one of the retaining portions.

[0168] Preferably, rotation of the key head causes longitudinal movement of the key stem relative to the retainer. More preferably, rotation of the key head causes longitudinal movement of the key stem relative to the retainer and the wear-resistant member retaining assembly to clamp the wear-resistant member to the structure.

[0169] In one embodiment, rotating the key head to attach the key head to the key stem biases the key to the locked position.

[0170] In one embodiment where the wear member retaining assembly has a cap, after the key is in the locked position, the cap is installed in the second hole. In one embodiment, the method includes attaching the cap to the wear member.

[0171] In one embodiment where the wear member retaining assembly has a cap, the cap is attached to the key head. Preferably, the cap is attached to the key head before the key is inserted through the second hole and the first hole to reach the unlocked position.

[0172] In another aspect, the present invention broadly relates to a wear member retaining assembly for retaining a wear member to a structure, the wear member retaining assembly comprising,

[0173] a retainer having an annular collar and a hole with two channels; and

[0174] a key having a key head and a key stem, the key stem having a first end capable of engaging with the retainer, the first end having two protrusions, each protrusion capable of being received within one of the two channels,

[0175] wherein each channel has a longitudinal portion, a transverse portion, and a retaining portion;

[0176] wherein each channel leads to the hole;

[0177] wherein the annular collar has a radially projecting lip having a contact surface abutting the structure;

[0178] wherein the key head has a contact surface abutting the wear member;

[0179] wherein the retainer has a cover preventing the key or a part of the key from being removed from the retainer in other ways than through the hole; and

[0180] wherein the key is movable relative to the retainer from an unlocked position to a locked position, in the unlocked position, each protrusion is aligned with one of these portions of the channel.

[0181] In another aspect, the present invention broadly relates to a method of using a wear member retaining assembly to retain a wear member to a structure, the wear member retaining assembly comprising,

[0182] a retainer having an annular collar and a hole with two channels; and

[0183] a key having a key head and a key stem, the key stem having a first end capable of engaging with the retainer, the first end having two protrusions, each protrusion capable of being received within one of the two channels,

[0184] wherein each channel has a longitudinal portion, a transverse portion, and a retaining portion;

[0185] Each of which leads to the hole;

[0186] Wherein the annular collar has a radially protruding lip, the lip having an abutment surface that abuts the structure;

[0187] Wherein the key head has an abutment surface that abuts the wear-resistant member;

[0188] Wherein the retainer has a cover that prevents the key or a part of the key from being removed from the retainer by any means other than through the hole; and

[0189] Wherein the key is movable relative to the retainer from an unlocked position to a locked position, in the unlocked position, each protrusion is aligned with one of these first portions of the channel;

[0190] The structure has a first side, a second side, and a through first hole, the first hole having a recess on the first side for receiving the lip;

[0191] The wear-resistant member has a through second hole;

[0192] Wherein the method includes,

[0193] Positioning the retainer within the first hole from the first side such that the abutment surface of the lip abuts the recess of the first hole;

[0194] Positioning the wear-resistant member against the first side of the structure such that the second hole is aligned with the hole;

[0195] Inserting the key through the second hole and the first hole to the unlocked position; and

[0196] Moving the key to the locked position.

[0197] Preferably, when the key is moved to the locked position, a part of the key abuts the wear-resistant member, and when the key is in the locked position and the wear-resistant member retaining assembly is tightened, the wear-resistant member retaining assembly engages the structure and the wear-resistant member in a clamping manner.

[0198] In one embodiment, the key stem is first inserted through the first hole and the second hole to the unlocked position, and then the key head is attached to the key stem. Preferably, the key stem is inserted through the first hole to the unlocked position before positioning the wear-resistant member against the first side of the structure.

[0199] In an alternative embodiment, the key head is attached to the key stem before inserting the key through the first hole and the second hole to the unlocked position.

[0200] Preferably, the key is inserted into the retainer such that each of the protrusions is received within one of the longitudinal portions. Preferably, when the key is moved to the locked position, each of the protrusions moves from within one of the longitudinal portions to within one of the transverse portions. More preferably, when the key is moved to the locked position, the key and the retainer are positioned such that each protrusion moves from within one of the longitudinal portions to within one of the transverse portions and then to within one of the retaining portions.

[0201] Preferably, rotation of the key head causes longitudinal movement of the key stem relative to the retainer. More preferably, rotation of the key head causes longitudinal movement of the key stem relative to the retainer and the wear member retaining assembly to clamp the wear member to the structure.

[0202] In one embodiment, rotating the key head to attach the key head to the key stem biases the key to the locked position.

[0203] In one embodiment in which the wear member retaining assembly has a cap, after the key is in the locked position, the cap is installed in the second hole. In one embodiment, the method includes attaching the cap to the wear member.

[0204] In one embodiment in which the wear member retaining assembly has a cap, the cap is attached to the key head. Preferably, the cap is attached to the key head before the key is inserted through the second hole and the first hole to the unlocked position.

[0205] In one embodiment, the method further includes attaching the retainer to the structure after positioning. Preferably, the method further includes welding the retainer to the structure after positioning.

[0206] In another aspect, the present invention broadly relates to a system for retaining a wear member to a structure, the system comprising,

[0207] a retainer having a hole with at least one channel; and

[0208] a key, a first end of the key being engageable with the retainer, the first end having at least one protrusion receivable by the at least one channel, the key including a key stem and a key head attached to or attachable to the key stem;

[0209] wherein the wear member retaining assembly has an unlocked position and a locked position, in the unlocked position, the key is removable from the retainer, in the locked position, the first end of the key is engaged with the retainer;

[0210] wherein the first end of the key is movable relative to the retainer from the unlocked position to the locked position;

[0211] Wherein when the wear member holding assembly is in the locked position, the key head is attached to the key stem and the key head abuts against a portion of the wear member.

[0212] In yet another aspect, the present invention broadly relates to a system for attaching a wear member to a structure, the system comprising,

[0213] A wear member having a hole; and

[0214] A wear member holding assembly that is configured to be partially inserted through the hole of the wear member to attach the wear member to the structure, the wear member holding assembly comprising,

[0215] A retainer having a hole with at least one channel; and

[0216] A key, a first end of the key being engageable with the retainer, the first end having at least one protrusion that can be received by the at least one channel, the key including a key stem and a key head, the key head being attached to or attachable to the key stem;

[0217] Wherein the wear member holding assembly has an unlocked position and a locked position, in the unlocked position, the key can be removed from the retainer, and in the locked position, the first end of the key is engaged with the retainer;

[0218] Wherein the first end of the key is movable relative to the retainer from the unlocked position to the locked position;

[0219] Wherein when the wear member holding assembly is in the locked position, the key head is attached to the key stem and the key head abuts against a portion of the wear member.

[0220] In yet another aspect, the present invention broadly relates to a retainer for engaging with a key to attach a wear member to a structure, the retainer having a hole with at least one channel for receiving a protrusion of the key.

[0221] In another aspect, the present invention broadly relates to a kit for a wear member holding assembly, the kit comprising

[0222] A retainer having a hole with at least one channel; and

[0223] A key, a first end of the key being engageable with the retainer, the first end having at least one protrusion that can be received by the at least one channel, the key including a key stem and a key head, the key head being attached to or attachable to the key stem, and the key head being configured to abut against the wear member;

[0224] Wherein the wear-resistant member holding assembly has an unlocked position and a locked position. In the unlocked position, the key can be removed from the retainer. In the locked position, the first end of the key engages with the retainer; and

[0225] Wherein the first end of the key is movable relative to the retainer from the unlocked position to the locked position.

[0226] Preferably, the kit includes a wear-resistant member.

[0227] Preferably, the kit includes a washer.

[0228] Features described with respect to one aspect are applicable, where appropriate, to all other aspects of the present invention. In addition, different combinations of the described features are described and claimed herein even if not explicitly specified. BRIEF DESCRIPTION OF THE DRAWINGS

[0229] For a better understanding of the present invention, reference is now made to the accompanying drawings, which illustrate preferred embodiments of the present invention, and in which:

[0230] Figure 1 is a cross-sectional perspective view of a wear-resistant member holding assembly for holding a wear-resistant member to a structure according to an embodiment of the present invention;

[0231] Figure 2 is according to Figure 1 a cross-sectional view of a wear-resistant member holding assembly for holding a wear-resistant member to a structure;

[0232] Figure 3 is according to Figure 1 a perspective view of the retainer of the wear-resistant member holding assembly;

[0233] Figure 4a is according to Figure 1 a side view of the retainer of the wear-resistant member holding assembly;

[0234] Figure 4b is according to Figure 1 a top view of the retainer of the wear-resistant member holding assembly;

[0235] Figure 5a is according to Figure 1 a front view of the retainer of the wear-resistant member holding assembly;

[0236] Figure 5b is according to Figure 1 a rear view of the retainer of the wear-resistant member holding assembly;

[0237] Figure 6 is according to Figure 1 a perspective view of the key rod of the wear-resistant member holding assembly;

[0238] Figure 7a is the first side view of the key rod of the wear-resistant member holding assembly according to Figure 1 ;

[0239] Figure 7b is the second side view of the key rod of the wear-resistant member holding assembly according to Figure 1 ;

[0240] Figure 8 is the front view of the key rod of the wear-resistant member holding assembly according to Figure 1 ;

[0241] Figure 9 is the perspective view of the key head of the wear-resistant member holding assembly according to Figure 1 ;

[0242] Figure 10 is the side view of the key head of the wear-resistant member holding assembly according to Figure 1 ;

[0243] Figure 11 is the front view of the key head of the wear-resistant member holding assembly according to Figure 1 ;

[0244] Figure 12 is the cross-sectional perspective view of the wear-resistant member holding assembly for holding a wear-resistant member to a structure according to an embodiment of the present invention;

[0245] Figure 13 is the cross-sectional view of the wear-resistant member holding assembly for holding a wear-resistant member to a structure according to Figure 12 ;

[0246] Figure 14 is the perspective view of the retainer of the wear-resistant member holding assembly according to Figure 12 ;

[0247] Figure 15a is the front view of the retainer of the wear-resistant member holding assembly according to Figure 12 ;

[0248] Figure 15b is the rear view of the retainer of the wear-resistant member holding assembly according to Figure 12 ;

[0249] Figure 16a is the front perspective view of the key head of the wear-resistant member holding assembly according to Figure 12 ;

[0250] Figure 16b is the rear perspective view of the key head of the wear-resistant member holding assembly according to Figure 12 ;

[0251] Figure 17 is according toFigure 12 Side view of the key head of the wear-resistant member holding assembly;

[0252] Figure 18 is according to Figure 12 Front view of the key head of the wear-resistant member holding assembly;

[0253] Figure 19a is according to Figure 12 Front perspective view of the cap of the wear-resistant member holding assembly;

[0254] Figure 19b is according to Figure 12 Rear perspective view of the cap of the wear-resistant member holding assembly;

[0255] Figure 20 is according to Figure 12 Side view of the cap of the wear-resistant member holding assembly;

[0256] Figure 21 is according to Figure 12 Front view of the cap of the wear-resistant member holding assembly;

[0257] Figure 22 Cross-sectional perspective view of the wear-resistant member holding assembly according to an embodiment of the present invention;

[0258] Figure 23 is Figure 22 Perspective view of the retainer of the wear-resistant member holding assembly, the retainer being positioned in a hole of a structure using a fixing tool;

[0259] Figure 24 is Figure 22 Cross-sectional side view of the retainer of the wear-resistant member holding assembly, the retainer being positioned in a hole of a structure using a fixing tool;

[0260] Figure 25 is Figure 23 Perspective view of the retainer on one end of the fixing tool in ; and

[0261] Figure 26 Cross-sectional perspective view of the wear-resistant member holding assembly for holding a wear-resistant member to a structure according to an embodiment of the present invention. Detailed Description

[0262] Referring to Figures 1 to 14 , there is shown a wear-resistant member holding assembly 10 for holding a wear-resistant member 90 to a structure 80 according to a preferred embodiment of the present invention. The wear-resistant member 90 may need to be fixed at multiple points. In this case, each point will use the wear-resistant member holding assembly 10. A single wear-resistant member holding assembly 10 is described below.

[0263] The wear-resistant member holding assembly 10 has a retainer 20, a key rod 30, and a key head 40. The wear-resistant member holding assembly 10 has a longitudinal axis 60. The key rod 30 and the key head 40 can be attached together to form a key.

[0264] The structure 80 is described as a flat sheet having a through circular first hole 82. The structure 80 has a first side and a second side.

[0265] The wear-resistant member 90 is depicted as a flat sheet having a through circular second hole 92. The wear-resistant member 90 is attached to the first side of the structure 80. The second hole 92 has a first opening 96 on one side of the wear-resistant member 90 and a second opening 98 on the side of the wear-resistant member 90 attached to the structure 80. The first opening 96 is larger than the second opening 98. The second hole 92 has a tapered abutting portion 94.

[0266] The retainer 20 has a hole 22 centered on the longitudinal axis 60. The hole 22 extends in the longitudinal direction with respect to the longitudinal axis 60. The hole 22 forms a longitudinal hole through the retainer 20.

[0267] The retainer has two channels 24A / 24B.

[0268] The two channels 24A / 24B are rotationally symmetric about the longitudinal axis 60 by 180 degrees with respect to each other. Each channel 24A / 24B has a longitudinal portion, a transverse portion, and a retaining portion 27A / 27B.

[0269] Each longitudinal portion leads to the hole 22.

[0270] Each channel 24A / 24B leads to the hole 22.

[0271] Each channel 24A / 24B opens to the outside of the retainer 20.

[0272] Each longitudinal portion defines a generally straight path extending in the longitudinal direction with respect to the longitudinal axis 60. Each longitudinal portion leads to one of each transverse portion. Each longitudinal portion is tapered so as to narrow towards the transverse portion.

[0273] Each transverse portion defines a path extending in the transverse direction with respect to the longitudinal axis 60. Each transverse portion defines a generally arcuate path around the longitudinal axis 60. Each transverse portion has a raised section that biases the protrusion into the retaining portion 27A / 27B and thus biases the key into the locked position.

[0274] Each transverse portion is connected to one of the longitudinal portions. Each transverse portion leads to one of the retaining portions 27A / 27B.

[0275] Each retaining portion 27A / 27B has a closed end.

[0276] The retainer 20 has two shoulder portions 28 that prevent the key or a part of the key from falling out of the retainer 20.

[0277] A disadvantage of known fasteners is that parts may fall during removal or in the event of fastener component failure. Over time, fasteners attaching wear-resistant members to a structure may deteriorate and / or break, and parts of the broken fasteners may similarly fall. Since fasteners are typically made of metal, the fallen fasteners or their parts can cause serious injury to personnel and equipment. For example, a worker removes a wear-resistant member installed on a chute with known fasteners, where the fasteners include bolts, cam nuts, and cap nuts. Removing the wear-resistant member requires working from the inside of the chute. To remove the wear-resistant member (i.e., for replacement), the cap nut on the bolt is loosened. The cap nut can also be completely removed from the bolt. At this time, for various reasons (e.g., if the worker is careless), the cam nut and bolt may slip out of the outer chute and fall. Since chutes in industrial applications can be quite high or installed at heights, the fallen fasteners can fall a significant distance. A retainer with shoulders attached to a structure can prevent parts from falling, thus reducing the hazard.

[0278] The key stem 30 is cylindrical, having a first end capable of engaging with the retainer 20 and a second end. The key stem 30 has a longitudinal axis that is coaxial with the longitudinal axis of the wear-resistant member retaining assembly 10 during assembly.

[0279] Each key stem 30 has a flange 36 positioned between the first end and the second end. The flange 36 has a diameter larger than the hole 22. The flange 36 prevents the key stem 30 from passing completely through the retainer 20.

[0280] The first end has two protrusions 32A / 32B. The protrusions 32A / 32B extend radially from the key stem 30 transverse to the longitudinal axis of the key. The protrusions 32A / 32B extend in opposite directions from each other.

[0281] Each protrusion 32A / 32B is capable of being received within one of two channels 24A / 24B. The taper of each longitudinal portion is designed to help position one of the protrusions 32A / 32B into one of the channels 24A / 24B when the key stem is received into the retainer.

[0282] The first end has a front end opposite the second end. The front end is the first part of the key stem 30 that enters the retainer 20 when the key stem 30 is inserted into the retainer 20.

[0283] The first end has a taper on its leading edge to assist in positioning the key stem 30 into the hole 22.

[0284] Each projection 32A / 32B has a first taper on its leading edge to assist in positioning the projection 32A / 32B into the respective channel 24A / 24B. The taper on the first end and the first taper on the leading edge of the projections 32A / 32B form a single conical surface. Each projection 32A / 32B has a second taper on its leading edge to assist in positioning the projection 32A / 32B into the respective channel 24A / 24B.

[0285] Each projection 32A / 32B has a taper on its trailing edge to assist in positioning one of the projections 32A / 32B within one of the retaining portions 27A / 27B. The taper is angled so as to bias one of the projections 32A / 32B into one of the retaining portions 27A / 27B when the key stem 30 is rotated to engage with the retainer 20.

[0286] The key stem 30 has a tool - fitting recess 34 with a hexagonal cross - section that extends longitudinally within the second end.

[0287] The key stem 30 has external threads 38 on the second end.

[0288] The key head 40 has a first key - head portion 46 and a second key - head portion 47. The second key - head portion 47 is larger than the first key - head portion 46. The key head 40 has a longitudinal axis that is coaxial with the longitudinal axis of the wear - resistant member retaining assembly 10 during assembly.

[0289] The first key - head portion 46 is attachable to the key stem 30.

[0290] The first key - head portion 46 has a recess 42 that has internal threads on its inner surface, which correspond to the external threads 38 of the key stem 30.

[0291] The threaded connection between the key stem 30 and the key head 40 is designed such that the direction of screwing in of the key head 40 is consistent with the direction of movement of the key head 30, so that the projections 32A / 32B can move through the transverse portion towards the retaining portions 27A / 27B. Rotating the key head 40 to attach the key head 40 to the key stem 30 by a tool can also rotate the key stem 30 such that the projections 32A / 32B move through the transverse portion.

[0292] A disadvantage present in known fasteners is that the bolt may extend further than the wear-resistant surface of the wear-resistant member, causing a portion of the bolt to be worn and / or damaged. This can occur due to the bolt being longer than required, or the wear-resistant surface deteriorating over time, resulting in a portion of the bolt being exposed. The exposed portion of the bolt may be worn or damaged, causing the bolt to become stuck or deformed, thereby hindering the removal of the wear-resistant member. This disadvantage also exists in the installation practice of known fasteners, where workers installing the wear-resistant member often select bolts that protrude further than the wear-resistant surface of the wear-resistant member, causing a portion of the bolt to be worn and / or damaged.

[0293] The keyhead recess 42 has an open end and a closed end. If the bolt is too long, the keyhead recess 42 can prevent the use of an improperly sized bolt by preventing the correct installation of the wear-resistant member 90.

[0294] The second keyhead portion 47 has a tapered abutment portion 48 that abuts the wear-resistant member 90 at the abutment portion 94.

[0295] The keyhead 40 has three cylindrical tool-assembly recesses 44 that are equidistantly arranged from each other at a certain offset distance from the longitudinal axis of the keyhead 40 and extend longitudinally through the keyhead 40. The end portions of each tool-assembly recess 44 lead to the first hole 82 and the second hole 92. This allows for the effective removal of accumulated ore and / or dirt from each tool-assembly recess 44.

[0296] A disadvantage of known fasteners is that, when installed, due to the positioning difference between one end of the fastener and the wear-resistant surface of the wear-resistant member (i.e., if the fastener is not protruding or flush with the wear-resistant surface), there is typically a recess in the assembly. The shape of this recess is usually circular. This recess provides a starting point for accelerated wear and premature failure of the wear-resistant member. During use, the wear-resistant member will experience non-uniform and / or excessive wear at the lower end of the recess, resulting in a unique teardrop-shaped wear pattern. The wear life of a wear-resistant member having a recess at the fastening position is shorter than that of a wear-resistant member with a flat wear-resistant surface, meaning that the wear-resistant member needs to be replaced more frequently.

[0297] In use, the wear-resistant member holding assembly 10 is used to secure the wear-resistant member 90 to the structure 80.

[0298] The retainer 20 is inserted into the first hole 82 to the desired position or positioned from the outside of the structure 80 to the desired position. The retainer 20 is then welded to the structure 80. The welding can be performed from either one or both sides of the structure 80.

[0299] The wear-resistant member 80 is positioned against the first side of the structure 80 such that the second hole is aligned with the first hole 82.

[0300] The key stem 30 is inserted through the first hole 82 and the second hole 92 to reach the unlocking position, where the protrusion 32A is aligned with the channel 24A and the protrusion 32B is aligned with the channel 24B.

[0301] The key stem 30 is moved to the locking position. To this end, the key stem 30 is longitudinally moved towards the retainer 20 such that the protrusions 32A / 32B move through the longitudinal portion. Then the key stem 30 is rotated such that the protrusions 32A / 32B move through the transverse portion. Then, the key stem 30 is longitudinally moved away from the retainer 20 such that the protrusions 32A / 32B move to the closed ends of the retaining portions 27A / 27B.

[0302] Rotating the key head 40 onto the key stem 30 brings the key head 40 and the key stem 30 closer together such that the key head 40 abuts against the wear-resistant member 90 and the protrusions 32A / 32B are pulled into the retaining portions 27A / 27B. When the protrusions 32A / 32B are located within the retaining portions 27A / 27B, the key stem 30 is prohibited from rotating about the longitudinal axis 60 in the clockwise direction. Accordingly, the wear-resistant member 90 is retained to the structure 80 and the key stem 30 is prohibited from rotating about the longitudinal axis 60 in the clockwise direction.

[0303] The key head 40 can be attached to the key stem 30 before the key stem 30 is inserted through the first hole 82 and the second hole 92 to reach the unlocking position.

[0304] To remove the wear-resistant member retaining assembly 10, first rotate the key head 40 to remove it from the key stem 30. Move the key stem 30 longitudinally such that the protrusions 32A / 32B move away from the closed ends of the retaining portions 27A / 27B. Then rotate the key stem 30 such that the protrusions 32A / 32B move through the transverse portion. Then, move the key stem 30 longitudinally such that the protrusions 32A / 32B move through the longitudinal portion and remove the key stem 30 from the retainer 20. The key head 40 can be partially rotated so as to still be attached to the key stem 30 and allow the protrusions 32A / 32B to move into the transverse portion, thereby allowing the key stem 30 to be rotatable relative to the retainer 20. With a tool, the key head 40 is longitudinally held in place and rotation of the key head 40 longitudinally moves the key stem 30 such that the protrusions 32A / 32B move away from the closed ends of the retaining portions 27A / 27B. If desired, the retainer 20 can then be removed from the structure.

[0305] Reference Figures 12 to 21 shows a wear-resistant member retaining assembly 110 for retaining a wear-resistant member 190 to a structure 180 according to a preferred embodiment of the present invention.

[0306] The wear-resistant member retaining assembly 110 has a retainer 120, a key rod 130, a key head 140, and a cap 150. The wear-resistant member retaining assembly 110 has a longitudinal axis 160. The key rod 130 and the key head 140 can be attached together to form a key.

[0307] The structure 180 is described as a flat sheet having a through circular first hole 182. The structure 180 has a first side and a second side. The first hole 182 has a recess adjacent to the first side.

[0308] The wear-resistant member 190 is depicted as a flat sheet having a through circular second hole 192. The wear-resistant member 190 is attached to the first side of the structure 180. The second hole 192 has a first opening 196 on one side of the wear-resistant member 190 and a second opening 198 on the side of the wear-resistant member 190 attached to the structure 180. The second opening 198 is smaller than the first hole 182. The first opening 198 is larger than the second opening 196. The second hole 192 has a tapered abutting portion 194.

[0309] The retainer 120 has a hole 122 centered on the longitudinal axis 160.

[0310] The hole 122 extends in the longitudinal direction with respect to the longitudinal axis 160. The hole 122 forms a longitudinal hole through the retainer 120.

[0311] The retainer has two channels 124A / 124B.

[0312] The two channels 124A / 124B are rotationally symmetric about the longitudinal axis 160 by 180 degrees with respect to each other. Each channel 124A / 124B has a longitudinal portion, a transverse portion, and a retaining portion 127A / 127B.

[0313] Each longitudinal portion leads to the hole 122.

[0314] Each channel 124A / 124B leads to the hole 122.

[0315] Each channel 124A / 124B opens to the outside of the retainer 120. This provides a hole that passes through the retainer 120 transversely.

[0316] Each longitudinal portion defines a generally straight path extending in the longitudinal direction with respect to the longitudinal axis 160. One end of each longitudinal portion is open and leads to one end of each transverse portion. Each longitudinal portion is tapered so as to narrow towards the transverse portion.

[0317] Each lateral portion defines a path extending in a lateral direction relative to the longitudinal axis 160. Each lateral portion defines a generally arcuate path around the longitudinal axis 160. Each lateral portion has a raised section that biases the protrusion into the retaining portion 127A / 127B and thus biases the key into the locked position.

[0318] Each lateral portion leads to one of the longitudinal portions. Each second portion leads to one of the retaining portions 127A / 127B.

[0319] Each retaining portion 127A / 127B has a closed end.

[0320] The retainer 120 has two shoulder portions 128 that prevent the key or a part of the key from falling out of the retainer 120.

[0321] The key stem 130 is cylindrical, having a first end that can engage with the retainer 120 and a second end. The key stem 130 has a longitudinal axis that is coaxial with the longitudinal axis of the wear-resistant member retaining assembly 110 during assembly.

[0322] Each key stem 130 has a flange 136 positioned between the first end and the second end. The flange 136 has a diameter larger than the hole 122. The flange 136 prevents the key stem 130 from passing completely through the retainer 120. The first end has two protrusions 132A / 132B. The protrusions 132A / 132B extend radially from the key stem 130 transverse to the longitudinal axis of the key. The protrusions 132A / 132B extend in opposite directions from each other.

[0323] Each protrusion 132A / 132B can be received within one of two channels 124A / 124B. The taper of each longitudinal portion is designed to help position one of the protrusions 132A / 132B into one of the channels 124A / 124B when the key stem is received into the retainer.

[0324] The first end has a front end opposite the second end. The front end is the first part of the key stem 130 that enters the retainer 120 when the key stem 130 is inserted into the retainer 120.

[0325] The first end has a 45-degree taper on its leading edge to help position the key stem 130 into the hole 122.

[0326] Each projection 132A / 132B has a first 45-degree taper on its leading edge to assist in positioning the key stem 130 into the hole 122. The taper on the first end and the first taper on the leading edge of the projection 132A / 132B form a single conical surface. Each projection 132A / 132B has a second taper on its leading edge to assist in positioning the projection 132A / 132B into the respective channel 124A / 124B.

[0327] Each projection 132A / 132B has a taper on its trailing edge to assist in positioning one of the projections 132A / 132B within one of the retaining portions 127A / 127B. The taper is angled so that when the key stem 130 is rotated to engage with the retainer 120, one of the projections 132A / 132B is biased into one of the retaining portions 127A / 127B. The key stem 130 has a tool assembly recess 134 with a hexagonal cross-section that extends longitudinally within the second end.

[0328] The key stem 130 has an external thread 138 on the second end.

[0329] The key head 140 has a first key head portion 146 and a second key head portion 147. The second key head portion 147 is larger than the first key head portion 146. The key head 140 has a longitudinal axis that is coaxial with the longitudinal axis of the wear-resistant member retaining assembly 110 during assembly.

[0330] The first key head portion 146 is attachable to the key stem 130.

[0331] The first key head portion 146 has a hole 142 that has an internal thread on its inner surface, which corresponds to the external thread 138 of the key stem 130. The hole 142 extends through the entire key head 140.

[0332] The threaded connection between the key stem 130 and the key head 140 is designed such that the direction of screwing in of the key head 140 is consistent with the direction of movement of the key head 130, so that the projection can move through the transverse portion towards the retaining portions 127A / 127B. Rotating the key head 140 to attach the key head 140 to the key stem 130 with a tool can also rotate the key stem 130 such that the projections 132A / 132B move through the transverse portion.

[0333] The second key head portion 147 has a conical abutment portion 148 that abuts the wear-resistant member 190 at the abutment portion 194.

[0334] The key head 140 has three cylindrical tool mounting recesses 144 which are arranged equidistantly from each other at a certain offset distance from the longitudinal axis of the key head 140 and extend longitudinally through the key head 140. The end portions of each tool mounting recess 144 lead to a first hole 182 and a second hole 192. This allows the effective removal of accumulated ore and / or dirt from each tool mounting recess 144.

[0335] The cap 150 is cylindrical and has a generally flat outer-facing surface. The cap 150 has a pin 154 which can be received within the hole 142 of the key head 140. The pin 154 has an external thread 156 corresponding to the internal thread of the hole 142 of the key head 140.

[0336] When the wear member retaining assembly 110 is installed, the generally flat outer-facing surface will be flush with or protrude beyond the outer-facing surface of the wear member 190. The cap 150 is made of the same material as the wear member 190 or a material having a hardness greater than the hardness of the material of the wear member 190.

[0337] The cap 150 has three cylindrical tool mounting recesses 152 which are arranged equidistantly from each other at a certain offset distance from the longitudinal axis of the cap 150 and extend longitudinally through the cap 150.

[0338] In use, the wear member retaining assembly 110 is used to secure the wear member 190 to the structure 180.

[0339] The retainer 120 is inserted through the first hole 182 from the first side of the structure 180 to a desired position or positioned from the outside of the structure 180 to a desired position. The retainer 120 is welded to the structure 180. The welding can be performed from either one or both sides of the structure 180.

[0340] The wear member 180 is positioned against the first side of the structure 180 such that the second hole is aligned with the first hole 182. Since the opening of the second hole 192 adjacent to the first side is smaller than the first hole 182, the retainer 120 is held between the structure 190 and the wear member 180.

[0341] The key stem 130 is inserted through the first hole 182 and the second hole 192 to an unlocking position where the protrusion 132A is aligned with the channel 124A and the protrusion 132B is aligned with the channel 124B.

[0342] The key stem 130 is moved to the locked position via a tool. To this end, the key stem 130 is longitudinally moved towards the retainer 120 such that the protrusions 132A / 132B move through the longitudinal portion. Then the key stem 130 is rotated such that the protrusions 132A / 132B move through the transverse portion. Then, the key stem 130 is longitudinally moved such that the protrusions 132A / 132B move to the closed ends of the retaining portions 127A / 127B.

[0343] Rotating the key head 140 onto the key stem 130 brings the key head 140 and the key stem 130 closer together such that the key head 140 abuts against the wear-resistant member 190 and the protrusions 132A / 132B are pulled into the retaining portions 127A / 127B. When the protrusions 132A / 132B are located within the retaining portions 127A / 127B, the key stem 130 is prohibited from rotating about the longitudinal axis 160 in the clockwise direction. Accordingly, the wear-resistant member 190 is retained to the structure 180 and the key stem 130 is prohibited from rotating about the longitudinal axis 160 in the clockwise direction.

[0344] The key head 140 can be attached to the key stem 130 before inserting the key stem 130 through the first hole 182 and the second hole 192 to the unlocked position.

[0345] Then the cap 150 is inserted into the second hole 192 to abut against the key head 140.

[0346] To remove the wear-resistant member retaining assembly 110, first the cap 150 is unscrewed from the key head 140. The cap 150 may be completely worn out when removing / replacing the wear-resistant member retaining assembly. Rotate the key head 140 to remove it from the key stem 130. Move the key stem 130 longitudinally such that the protrusions 132A / 132B move away from the closed ends of the retaining portions 127A / 127B. Then rotate the key stem 130 such that the protrusions 132A / 132B move through the transverse portion. Then, move the key stem 130 longitudinally such that the protrusions 132A / 132B move through the longitudinal portion and remove the key stem 130 from the retainer 120. The key head 140 can be partially rotated so as to still be attached to the key stem 130 and allow the protrusions 132A / 132B to move into the transverse portion, thereby allowing the key stem 130 to be rotatable relative to the retainer 120. With a tool, the key head 140 is longitudinally held in place and the rotation of the key head 140 longitudinally moves the key stem 130 such that the protrusions 132A / 132B move away from the closed ends of the retaining portions 127A / 127B. If needed, the retainer 120 can then be removed from the structure.

[0347] Reference Figures 22 to 25 shows a wear-resistant member retaining assembly according to an embodiment of the present invention.

[0348] In Figure 23 and Figure 24 , retainer 220 is shown positioned within a hole in structure 280 by fixing tool 300. Fixing tool 300 moves retainer 220 to a desired position and holds retainer 220 in place for welding retainer 220 to structure 280. Welding can be performed from either one or both sides of structure 280.

[0349] Fixing tool 300 has a frame 310 having two mountings 320 for fixing frame 310 to structure 280 and a positioning mechanism 330. Positioning mechanism 330 has a positioning key having a first end capable of engaging retainer 220, the first end having at least one protrusion receivable by at least one channel, the positioning key being movable relative to retainer 220 from an unlocked position to a locked position. The positioning key is movable relative to frame 310 to move retainer 220 to a desired position while keeping frame 310 stationary. The key has a second end with a threaded portion. Fixing tool 300 has an adjusting nut 340 capable of being fastened to the threaded portion. Manipulating adjusting nut 340 adjusts the position of the key. Mountings 320 are magnetic and magnetically fix fixing tool 300 to structure 280. Mountings 320 are adjustable between an extended position and a retracted position. Fixing tool 300 has a handle 350.

[0350] In use, fixing tool 300 is mounted on structure 280 by mountings 320 and the positioning key is centered above the hole in structure 280. Retainer 220 is positioned within the hole in the structure. The positioning key is inserted and locked to retainer 220. Fixing tool 300 is adjusted by adjusting nut 340 to move retainer 220 to a desired position. Retainer 220 is then welded to the structure. The positioning key is moved to the unlocked position and fixing tool 300 is removed from the structure.

[0351] Then, wear member 290 is positioned such that the hole in wear member 290 is aligned with the hole in structure 280. Wear member 290 has two guide rails 270 shown on its surface. Guide rails 270 are attached to a back plate fixed to structure 280. A key is inserted through wear member 290, structure 280, and retainer 220 to the unlocked position. The key has a key shank 230 and a key head 240. The key is then moved to the locked position and rotated to fix wear member 290 to structure 280.

[0352] Referring Figure 26 , there is shown a wear member retaining assembly 440 for retaining a wear member 490 to a structure 480 according to a preferred embodiment of the present invention.

[0353] The wear-resistant member retaining assembly 440 has a retainer 420, a key rod 430, a key head 440, and a cap 450. The wear-resistant member retaining assembly 440 has a longitudinal axis 460. The key rod 430 and the key head 440 can be attached together to form a key.

[0354] The structure 480 is described as a flat sheet having a through circular first hole 482. The structure 480 has a first side and a second side. The first hole 482 has a recess adjacent to the first side.

[0355] The wear-resistant member 490 is depicted as a flat sheet having a through circular second hole 492. The wear-resistant member 490 is attached to the first side of the structure 480. The second hole 492 has a first opening on the surface of the wear-resistant member 490 attached to the structure 480 and a second opening on the opposite surface of the wear-resistant member 490. The first opening is smaller than the first hole 482. The second opening is larger than the first opening. The second hole 492 has a tapered abutting portion 494.

[0356] The retainer 420 is generally cylindrical in shape. The retainer 420 has a hole centered on the longitudinal axis 460. The retainer 420 has an annular collar 428 that has a radially protruding lip 429. The radially protruding lip 429 abuts the recess in the first side of the structure 480.

[0357] The hole is circular and extends in the longitudinal direction relative to the longitudinal axis 460. The hole forms a longitudinal hole through the retainer 420.

[0358] The retainer has two channels 424A / 424B.

[0359] The two channels 424A / 424B are rotationally symmetric about the longitudinal axis 460 by 180 degrees with respect to each other. Each channel 424A / 424B has a longitudinal portion, a transverse portion, and a retaining portion.

[0360] Each longitudinal portion leads to the hole.

[0361] Each channel 424A / 424B leads to the hole.

[0362] Each channel 424A / 424B opens to the outside of the retainer 420. This provides a hole that passes transversely through the retainer 420.

[0363] Each longitudinal portion defines a generally straight path that extends in the longitudinal direction relative to the longitudinal axis 460. One end of each longitudinal portion is open and leads to one end of each transverse portion. Each longitudinal portion is tapered so as to narrow towards the transverse portion.

[0364] Each transverse portion defines a path extending in a transverse direction relative to the longitudinal axis 460. Each transverse portion defines a generally arcuate path around the longitudinal axis 460.

[0365] Each transverse portion leads to one of the longitudinal portions. Each second portion leads to one of the retaining portions.

[0366] Each retaining portion has a closed end.

[0367] The retainer 420 has a cover 424 that prevents a key, key shank 430, key head 440, or a portion of the key from being removed from the retainer 420 by any means other than through the hole.

[0368] The key shank 430 is cylindrical, having a first end that can engage with the retainer 420 and a second end. The key shank 430 has a longitudinal axis that is coaxial with the longitudinal axis of the wear-resistant member retaining assembly 440 during assembly.

[0369] The first end has two protrusions 432A / 432B. The protrusions 432A / 432B extend radially from the key shank 430 transverse to the longitudinal axis of the key. The protrusions 432A / 432B extend in opposite directions from each other.

[0370] Each protrusion 432A / 432B can be received within one of two channels 424A / 424B. The taper of each longitudinal portion is designed to assist in positioning one of the protrusions 432A / 432B into one of the channels 424A / 424B when the key shank is received into the retainer.

[0371] The key shank 430 has a tool fitting recess 434 with a hexagonal cross-section that extends longitudinally within the second end.

[0372] The tool fitting recess 434 has a plurality of tool ball brakes 436 that are generally arranged at the center of the longitudinal inner surface of the tool fitting recess 434.

[0373] The key shank 430 has an external thread 438 on the second end.

[0374] The key head 440 has a first key head portion and a second key head portion. The second key head portion is larger than the first key head portion. The key head 440 has a longitudinal axis that is coaxial with the longitudinal axis of the wear-resistant member retaining assembly 440 during assembly.

[0375] The first key head portion can be attached to the key shank 430.

[0376] The first key head part has a hole 442 which has internal threads on its inner surface, and the internal threads correspond to the external threads 438 of the key rod 430. The hole 442 extends through the entire key head 440.

[0377] The threaded connection between the key rod 430 and the key head 440 is designed such that the screwing direction of the key head 440 is consistent with the moving direction of the key head 430, so that the protrusion can move through the transverse part towards the holding part. Rotating the key head 440 by a tool to attach the key head 440 to the key rod 430 can also rotate the key rod 430, causing the protrusions 432A / 432B to move through the transverse part.

[0378] The second key head part has a conical abutting part 448 which abuts against the wear-resistant member 490 at the abutting part 494.

[0379] The key head 440 has three cylindrical tool fitting recesses 444 which are arranged equidistantly from each other at a certain offset distance from the longitudinal axis of the key head 440 and extend longitudinally through the key head 440.

[0380] The cap 450 is generally cylindrical and has a generally flat outer-facing surface. The cap 450 has a pin 454 which can be received in the hole 442 of the key head 440. The pin 454 has external threads corresponding to the internal threads of the hole 442 of the key head 440.

[0381] When the wear-resistant member holding assembly 440 is installed, the generally flat outer-facing surface will be flush with or protrude from the outer-facing surface of the wear-resistant member 490. The cap 452 is made of the same material as the wear-resistant member 490 or a material with a hardness greater than that of the wear-resistant member 490.

[0382] The cap 450 has three cylindrical tool fitting recesses 452 which are arranged equidistantly from each other at a certain offset distance from the longitudinal axis of the cap 450 and extend longitudinally through the cap 450.

[0383] In use, the wear-resistant member holding assembly 440 is used to fix the wear-resistant member 490 to the structure 480.

[0384] Insert the retainer 420 from the first side of the structure 480 into the first hole 482 such that the lip 424 abuts the recess. The abutting surface of the retainer 420 abuts the structure 480 around the perimeter of the first hole 482. Weld the retainer 420 to the structure.

[0385] The wear-resistant member 480 is positioned against the first side of the structure 480 such that the second hole is aligned with the first hole 482. Since the opening of the second hole 492 adjacent to the first side is smaller than the first hole 482, the retainer 420 is held between the structure 490 and the wear-resistant member 480.

[0386] The key stem 430 is inserted through the first hole 482 and the second hole 492 to an unlocked position where the projection 432A is aligned with the channel 424A and the projection 432B is aligned with the channel 424B.

[0387] The key stem 430 is moved to the locked position via a tool. To this end, the key stem 430 is longitudinally moved towards the retainer 420 such that the projections 432A / 432B move through the longitudinal portion. Then the key stem 430 is rotated such that the projections 432A / 432B move through the transverse portion. Then, the key stem 430 is longitudinally moved such that the projections 432A / 432B move to the closed end of the retaining portion.

[0388] Rotating the key head 440 onto the key stem 440 brings the key head 440 and the key stem 430 closer together such that the key head 440 abuts against the wear-resistant member 490 and the projections 432A / 432B are pulled into the retaining portion. When the projections 432A / 432B are within the retaining portion, rotation of the key stem 430 about the longitudinal axis 460 is prevented. Accordingly, the wear-resistant member 490 is held to the structure 480 and rotation of the key stem 430 about the longitudinal axis 460 is prevented.

[0389] The key head 440 can be attached to the key stem 430 before the key stem 430 is inserted through the first hole 482 and the second hole 492 to the unlocked position.

[0390] Then the cap 450 is inserted into the second hole 492 to abut against the key head 440. Then, the cap 450 is fused to the wear-resistant member 90.

[0391] To remove the wear member retaining assembly 440, first unscrew the cap 450 from the key head 440. The cap 450 may be completely worn when removing / replacing the wear member retaining assembly. Rotate the key head 440 to remove it from the key stem 430. Move the key stem 430 longitudinally so that the protrusions 432A / 432B move away from the closed end of the retaining portion. Then rotate the key stem 430 so that the protrusions 432A / 432B move through the transverse portion. Then, move the key stem 430 longitudinally so that the protrusions 432A / 432B move through the longitudinal portion and remove the key stem 430 from the retainer 420. The key head 440 may be partially rotated so as to remain attached to the key stem 430 and allow the protrusions 432A / 432B to move into the transverse portion, thus allowing the key stem 430 to rotate relative to the retainer 420. Using a tool to hold the key head 440 longitudinally in place, rotation of the key head 440 longitudinally moves the key stem 430 so that the protrusions 432A / 432B move away from the closed end of the retaining portion. If desired, the retainer 420 may then be removed from the structure.

[0392] Advantages

[0393] An advantage of the preferred embodiment of the wear member retaining assembly is that the retainer greatly reduces the chance of incorrect installation of the wear member retaining assembly. The retaining portion of each channel prevents the key from disengaging from the retainer.

[0394] Another advantage of the preferred embodiment of the wear member retaining assembly is that the tapered retainer and tapered key stem facilitate the positioning and centering of the key stem in the retainer. This avoids incorrect installation of the wear member retaining assembly.

[0395] Yet another advantage of the preferred embodiment of the wear member retaining assembly is that the key is biased toward the locked position when the protrusion of the key stem is within the second portion. This effect is achieved by both the raised section of the second portion and the tapered trailing edge of the protrusion. In this way, the wear member retaining assembly is self-locking. This biasing avoids the situation where the wear member retaining assembly becomes loose and accidentally disengages.

[0396] Yet another advantage of the preferred embodiment of the wear member retaining assembly is that the key does not protrude further than the wear surface of the wear member. Thus, the key or a portion of the key is not exposed to wear / damage that may catch or deform the key in a manner that impedes the removal of the wear member. Especially if the stem protrudes into the chute.

[0397] Another advantage of the preferred embodiment of the wear member retaining assembly is that the rod does not project further than the first side of the structure. This makes it easier to position the wear member on the structure and, when the wear member is completely worn, the rod is not exposed to wear / resistance or damage that could jam or deform the rod in a way that would impede the removal of the wear member.

[0398] Yet another advantage of the preferred embodiment of the wear member retaining assembly is that the key head can be removed independently of the key rod.

[0399] Another advantage of the preferred embodiment of the wear member retaining assembly includes that the wear member can be fixed to the structure from one side. This is beneficial if the other side of the structure is inaccessible or if accessing the other side requires scaffolding to be erected. Additionally, repair, maintenance, and / or removal of the wear member retaining assembly can all be performed from one side.

[0400] Yet another advantage of the preferred embodiment of the wear member retaining assembly is that the wear member retaining assembly can be assembled to an existing silo without the need for scaffolding on the external surface.

[0401] Another advantage of the preferred embodiment of the wear member retaining assembly is that, if the key head is removed and the key rod remains engaged with the retainer, the tooling recess of the key rod can facilitate an alternative method of removing the key rod from the retainer.

[0402] Another advantage of the preferred embodiment of the wear member retaining assembly is that the fixing tool allows multiple retainers to be installed in multiple holes in the structure at a consistent and similar depth.

[0403] Another advantage of the preferred embodiment of the wear member retaining assembly is that the wear member retaining assembly requires round holes to be drilled in the structure rather than milling elongated slots. Drilling is a more efficient process than milling and is less costly. Drilling can also be easily performed on-site rather than having to remove a portion of the structure to be machined in a workshop.

[0404] Another advantage of the wear member retaining assembly is that, in embodiments where the retainer is encapsulated, the encapsulated retainer greatly reduces the chance of components falling from the installation point. This addresses the danger posed by falling objects that could cause injury to personnel or damage to equipment.

[0405] Another advantage of embodiments of the wear member retaining assembly that include a cap is that the cap prevents uneven wear in the unique teardrop-shaped wear pattern that is common when using known fasteners.

[0406] Another advantage of the embodiment of the wear member retaining assembly including a cap is that the cap protects the key head and the key stem from damage. Thus, the key head and the key stem will have a longer service life and can be reused in other assemblies.

[0407] Another advantage of the embodiment of the wear member retaining assembly including a cap is that the retainer, the key stem, and the key head can be produced in standardized sizes, where the cap is variable to accommodate differences in the thickness of the gasket. Thus, the metal components can be universally applied to various devices, where the thickness of the cap is variable to accommodate site-specific variations in the thickness of the wear-resistant gasket. Since other components such as the retainer, the key stem, and the key head are typically made of metal (usually structural-grade steel), the manufacturing cost of the cap is lower than that of these components. Thus, this arrangement is more cost-effective than manufacturing the entire assembly to accommodate variations in the thickness of the wear-resistant gasket.

[0408] Another advantage of the wear member retaining assembly is that existing devices using slotted holes in the structure can accommodate this wear member retaining assembly or can be easily retrofitted to accommodate this wear member retaining assembly. Drilling larger holes in the structure is easier than machining slots.

[0409] Variant

[0410] Although the foregoing has been given by way of illustrative examples of the present invention, all such and other modifications and variations which will be apparent to those skilled in the art are deemed to fall within the broad scope and ambit of the invention as set forth herein.

[0411] Throughout this specification and the claims, the word "comprising" and variations such as "comprises" and "comprising" are not intended to exclude other additives, components, integers, or steps.

Claims

1. A wear member retaining assembly for retaining a wear member to a structure, the wear member retaining assembly comprising, A retainer, the retainer having a bore with at least one channel; and a key, a first end of the key being engageable with the retainer, the first end having at least one projection receivable in the at least one passage, the key including a key shank and a key head, the key head being attachable to the key shank; wherein the wear member retaining assembly has an unlocked position and a locked position, in the unlocked position, the key is removable from the retainer, and in the locked position, the first end of the key is engaged with the retainer; wherein the first end of the key is movable relative to the retainer from the unlocked position to the locked position; wherein when the wear member retaining assembly is in the locked position, the key head is attached to the key shank and the key head abuts a portion of the wear member.

2. The wear member retaining assembly according to claim 1, wherein the passage has at least one first portion.

3. The wear member retaining assembly according to claim 1 or 2, wherein the wear member retaining assembly has a central longitudinal axis.

4. The wear member retaining assembly according to claim 3, wherein the at least one passage has at least one second portion extending in a lateral direction relative to the longitudinal axis.

5. The wear member retaining assembly according to claim 4, wherein the second portion defines a generally arcuate path around the longitudinal axis.

6. The wear member retaining assembly according to claim 4 or 5, wherein the at least one passage further has at least one retaining portion, one of the at least one retaining portions leading to one of the at least one second portions, and when the key is positioned such that the at least one projection is at an end of one of the at least one second portions connected to one of the at least one retaining portions, the key is movable in a longitudinal direction relative to the longitudinal axis to position the at least one projection within one of the at least one retaining portions.

7. The wear member retaining assembly according to claim 6, wherein the at least one retaining portion has a closed end, and when the key is in the locked position, the at least one projection is within the at least one retaining portion adjacent to the closed end.

8. The wear member retaining assembly according to claim 7, wherein when the key is in the locked position, the key is prohibited from rotating about the longitudinal axis due to at least one wall of the at least one passage blocking movement of the at least one projection.

9. The wear member retaining assembly according to any one of the preceding claims, wherein the retainer has a cover preventing removal of the key or a portion of the key from the retainer by any means other than through the hole.

10. The wear member retaining assembly according to any one of the preceding claims, wherein the retainer has an annular collar receivable in a hole in the structure.

11. The wear member retaining assembly according to claim 11, wherein the size of the opening is smaller than the size of the key shank.

12. The wear member retaining assembly according to any one of the preceding claims, wherein the wear member retaining assembly has a cap for protecting the key.

13. The wear member retaining assembly according to claim 12, wherein the cap has a pin that can be received in the hole of the key head, and the pin has an external thread corresponding to the internal thread of the hole of the key head.

14. The wear member retaining assembly according to any one of the preceding claims, wherein the retainer has a cover that prevents the key or a part of the key from being removed from the retainer by any means other than through the hole.

15. The wear member retaining assembly according to any one of the preceding claims, wherein the key shank has a flange with a diameter larger than that of the hole, such that the key shank is prevented from passing completely through the retainer during installation.

16. The wear member retaining assembly according to any one of the preceding claims, wherein the structure has a through first hole, the wear member has a through second hole, the second hole has an abutting portion on its inner surface, and the wear member and the structure can be positioned to align the first hole and the second hole, the key can be at least partially installed in the first hole, and the key head can be at least partially installed in the first hole and partially installed in the second hole.

17. A method of retaining a wear member to a structure using a wear member retaining assembly, the wear member retaining assembly comprising, A retainer, the retainer having a bore with at least one channel; and a key, a first end of the key being capable of engaging with the retainer, the first end having at least one protrusion that can be received by the at least one channel, the key comprising a key shank and a key head, the key head being attached to or capable of being attached to the key shank; wherein the wear member retaining assembly has an unlocked position and a locked position, in the unlocked position, the key can be removed from the retainer, and in the locked position, the first end of the key engages with the retainer; wherein the first end of the key can move from the unlocked position to the locked position relative to the retainer; wherein the structure has a first side, a second side, and a through first hole; wherein the wear member has a through second hole; wherein the method comprises the following steps, positioning the retainer such that the hole is aligned with the first hole; positioning the wear member against the first side of the structure such that the second hole is aligned with the first hole; attaching the key head to the key shank; inserting the key through the second hole and the first hole to the unlocked position; and moving the key to the locked position; wherein when the wear member retaining assembly is in the engaged position, the key head abuts a part of the wear member.

18. The method according to claim 17, wherein rotation of the key head causes longitudinal movement of the key stem relative to the retainer.

19. The method according to claim 17 or 18, wherein rotating the key head to attach the key head to the key stem biases the key to the locked position.

20. The method according to any one of claims 17 to 19, wherein the at least one channel has a longitudinal first portion, a transverse second portion, and a retaining portion, and whereby when the key moves to the locked position, the key and the retainer are positioned such that the at least one projection moves from within the longitudinal first portion to within the transverse second portion and then to within the retaining portion.

21. A system for retaining a wear member to a structure, the system comprising, A retainer, the retainer having a bore with at least one channel; and a key having a first end engageable with the retainer, the first end having at least one projection receivable by the at least one channel, the key including a key stem and a key head, the key head being attached to or attachable to the key stem; wherein the wear member retaining assembly has an unlocked position and a locked position, in the unlocked position, the key is removable from the retainer, and in the locked position, the first end of the key is engaged with the retainer; wherein the first end of the key is movable relative to the retainer from the unlocked position to the locked position; wherein when the wear member retaining assembly is in the locked position, the key head is attached to the key stem and the key head abuts a portion of the wear member.

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