Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
  • E02F9/2883—Wear elements for buckets or implements in general
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/46—Dredgers; Soil-shifting machines mechanically-driven with reciprocating digging or scraping elements moved by cables or hoisting ropes ; Drives or control devices therefor
  • E02F3/58—Component parts
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
  • E02F9/2808—Teeth
  • E02F9/2816—Mountings therefor
  • E02F9/2833—Retaining means, e.g. pins
  • E02F9/2841—Retaining means, e.g. pins resilient
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G15/00—Chain couplings, Shackles; Chain joints; Chain links; Chain bushes
  • F16G15/04—Quickly-detachable chain couplings; Shackles chain links with rapid junction means are classified according to the corresponding kind of chain
  • F16G15/06—Shackles designed for attachment by joint pins to chain elements, e.g. D-shackles so called harp links; the D-chain links are classified according to the corresponding kind of chain
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
  • F16B2200/69—Redundant disconnection blocking means
  • F16B2200/73—Cam locks or thread locks

Definitions

• the present disclosure generally relates to lock assemblies, components for lock assemblies and lock systems which include a lock assembly and/or lock components.
• the locks of the disclosure have particular application for use in land based excavating equipment to retain a member such as a wear member or rigging to excavating equipment and the disclosure is herein disclosed in that context .
• the locks of the disclosure have broader application, for example for waterborne excavators, such as dredgers, or securing liners to mineral processing equipment and accordingly it is to be appreciated that the disclosure is not limited to that application.
• Excavating buckets or other digging devices or equipment are typically subject to harsh conditions. Excavating buckets are generally used in various digging and excavation operations. Digging devices typically experience large forces during digging and excavation operations.
• Excavation teeth may be provided on the digging edge of the digging devices.
• Each excavation tooth is formed of a number of parts, commonly a point, an adapter and a lock.
• the adapter is typically fitted to the digging device and the point fits over the adapter and is retained in place by the lock.
• one or more intermediate parts may be also included between the point and the adapter.
• the reason that the excavation tooth is formed of a number of parts is to avoid having to discard the entire tooth when only parts of the tooth, in particular the ground engaging part of the tooth (i.e. the point) is worn or broken.
• shrouds are also attached to the digging lip of the device to protect the digging lip edge from wear. Once worn, the shrouds can be removed and discarded and a new replacement shroud attached. This reduces the need to replace the whole device if the lip edge became worn, which would be much more costly than replacing just the shrouds.
• the shrouds typically comprise a base member that fits around a portion of the lip edge, a wear member that fits over the base member and lock for locking the wear member to the base member and thus to lip, but which also allows the wear member to be removed once worn.
• the shrouds may be disposed along the entire length of the lip edge or be disposed between excavation teeth that are attached to the lip.
• rigging is required to interconnect the dragline buckets to a crane to operate the buckets.
• this rigging which includes various components such as chains, ropes, links and spreader bars, need to be connected together and connected to the dragline bucket.
• coupling elements such as shackles which include locking arrangements such as locking pins and the like which are retained in place by locks.
• these components are subject to very harsh operational conditions and accordingly the components need to be designed to operate in such hash conditions.
• a lock assembly comprising: a locking element having; a body having a first locking axis; at least one tab movable relative to the body between a retracted position and an extended position relative to the first locking axis; and a locking surface having at least one retaining element; wherein the lock assembly is operative to adopt a locked condition where the at least one tab engages with a respective one of the at least one retaining element to prevent relative movement between the locking element and the locking surface in at least one direction of the first locking axis.
• a locking element having a body having a first locking axis, at least one tab movable relative to the body between a retracted and an extended position relative to the first locking axis.
• the tab is arranged to translate relative to the body along a movement axis and that movement axis may be offset from the first locking axis. In another form, it may be radial relative to the first locking axis so that the movement axis intersects the first locking axis.
• the tabs may pivot relative to the body between its extended and retracted configurations.
• a component that incorporates a locking surface arranged to receive a locking member of any one of the above forms.
• the locking surface may be integrally formed with the component or may be formed on a retaining member which is fitted to the component.
• the component is part of an excavating machine such as a wear member such as a point or shroud, an adaptor, bucket lip, or part of rigging such as a shackle or link, or part of a retaining system such as a locking pin.
• a locking system comprising a component having a passage; a retaining member receivable in the passage of the component in a locking position; and a lock assembly according to any form disclosed herein disposed in at least part of the passage; wherein in use, the locking element of the lock assembly retains the retaining member in the passage of the housing.
• Embodiments of the locking assemblies, elements, and systems have particular application for use in excavating equipment and allow for hamerless installation and removal of the locking elements and good retention performance in operation of the equipment.
• Fig. 1 is an exploded perspective view of a lock assembly according to a first embodiment.
• Fig. 2a to 2h illustrates a locking and unlocking sequence of the lock assembly according to a first embodiment.
• Fig. 2a illustrates the locking ring and locking element before assembly according to the first embodiment.
• Fig. 2b illustrates the locking assembly of Fig. 2a, with the locking element inside the cavity of the locking ring, and with the tabs of the locking element disposed in the channels of the locking ring.
• Fig. 2c illustrates the locking assembly of Fig. 2b, with the locking element rotated slightly so that the tabs are slightly retracted.
• Fig. 2d illustrates the locking assembly of Fig. 2c, with the locking element rotated so that the tabs are retracted and located between the channels and the retaining elements.
• Fig. 2e illustrates the locking assembly of Fig. 2d, with the locking assembly in the locked condition, with the tabs extended and engaging with respective retaining elements.
• Fig. 2f illustrates the locking assembly of Fig. 2e, with the locking element rotated slightly so the tabs are slightly retracted.
• Fig. 2g illustrates the locking assembly of Fig. 2f, with the locking element rotated so that the tabs are retracted and located between the retaining elements and the channels.
• Fig. 2h illustrates the locking assembly of Fig. 2g with the locking element rotated so that the tabs are disposed in the channels of the locking ring.
• Fig. 3 is a perspective view of a locking element according to a second embodiment with a locking ring.
• Figs. 4a and 4b are exploded top and bottom perspective views of the locking element in Fig. 3.
• Figs. 5a to 5c illustrates sectioned top views of the locking element of Fig. 3 with the tabs in various positions.
• Fig. 6 is a perspective view of a locking element according to a third embodiment with a locking ring.
• Figs. 7a and 7b are exploded top and bottom perspective views of the locking element in Fig. 6.
• Figs. 8a to 8b illustrates sectioned top views of the locking element of Fig. 6 with the tabs in various positions.
• Fig. 9 is an exploded perspective view of a lock system comprising two lock assemblies and a lock pin.
• Fig. 10 is a perspective view of an assembled lock system in Fig. 9.
• Fig. 11 is a sectioned side view of the assembled lock system in Fig. 10.
• Fig. 12 is an exploded perspective view of a shackle assembly having a locking system.
• Fig. 13 is a top view of the shackle assembly of Fig. 12.
• Fig. 14 is a side view of the shackle assembly of Fig. 12.
• Fig. 15 is a sectioned top view along P-P in Fig. 14.
• Fig. 16 is a sectioned side view along R-R in Fig. 13.
• Fig. 17 is a schematic exploded perspective view of a shroud assembly having a locking system.
• This disclosure is directed generally to locks for excavating equipment and large scale mining operations.
• heavy duty shackles are secured with a shackle pin to connect components for example in a dragline. It is important that the shackle is securely locked in position and remains so during a period of robust service and when exposed to harsh conditions including vibration , impact, corrosion and abrasion. After a period of service components must be replaced and in a mine location there is a need to make such replacement with minimum downtime of the expensive equipment and with ease, speed and safety. There is a need to have lock assemblies which can retain the locking pins in position and operate effectively under these harsh conditions.
• a lock assembly comprising: a locking element having;
• a body having a first locking axis; at least one tab movable relative to the body, the tab movable between a retracted position and an extended position relative to the first locking axis; a locking surface having at least one retaining element; wherein the lock assembly is operative to adopt a locked condition where the at least one tab engages with a respective one of the at least one retaining element to prevent relative movement between the locking element and the locking surface in at least one direction of the first locking axis.
• the at least one tab is biased towards its extended position when in the locked condition.
• the locking surface is formed on an interior surface defining a cavity, and wherein the locking element is disposed within the cavity when the lock assembly is in the locked condition.
• the lock assembly is operative to change from the locked condition to an unlocked condition by a first relative movement between the locking element and the locking surface, the first relative movement causing the at least one tab to move towards its retracted position.
• At least one of the at least one tab and locking surface may include a camming surface arranged to cause movement of the at least one tab towards its retracted position during the first relative movement.
• the first relative movement includes relative rotation between the locking element and the locking surface about the first locking axis.
• the lock assembly is operative to adopt the locked condition from an unlocked condition by a second relative movement between the locking element and the locking surface.
• the at least one locking tab is caused to move towards the retracted position during said second relative movement.
• a camming surface is provided and arranged to cause movement of the at least one tab towards its retracted position during the second relative movement.
• the second relative movement includes relative rotation between the locking element and the locking surface about the first locking axis. In some forms, the second relative movement includes relative translation between the locking element and the locking surface along the first locking axis. In some forms, the locking surface includes one or more channels that permit location and/or removal of the locking element in the cavity whilst the at least one tab is in a substantially extended position. In some arrangements, these channels extend generally axially.
• the at least one locking tab is biased towards the extended position.
• an elastomeric member is disposed within the lock body and is operative to bias the locking tab into the extended position.
• the locking surface is disposed on a retaining member which in turn in use is arranged to be fixed to a component, such as a component of excavating equipment.
• the locking surface is integrally formed in a surface of the component.
• the locking surface may define a cavity that forms part of a cast, or otherwise formed, component of the excavating equipment.
• a locking element for a locking assembly in any form disclosed above.
• a component which incorporates a locking surface arranged to receive a locking member of the above form.
• the locking surface may be integrally formed with the component or may be formed on a retaining member which is fitted to the component.
• the component is part of an excavating machine such as a wear member such as a point or shroud, an adaptor, bucket lip, or part of rigging such as a shackle or link, or part of a retaining system such as a locking pin.
• a locking system comprising: a housing having a passage; a retaining member received in the passage of the housing; and a lock assembly according to any form disclosed above, disposed in at least part of the passage; wherein in use, the locking element of the lock assembly retains retaining member in the passage of the housing.
• FIG. 1 is an exploded perspective view of a lock assembly according to a first embodiment.
• Fig. 1 illustrates a lock assembly 1 comprising a locking element 3 and a retaining member which in the illustrative form is a locking ring 7.
• the locking ring 7 incorporates a cavity 23 having an interior locking surface 5 and the locking element is received in the cavity and engagable with the locking surface as will be described in more detail below.
• the locking element 3 has a body 4 which is generally cylindrical having an axis CL which forms a first locking axis of the body 4 and about which the locking element is arranged to rotate in use.
• the locking element 3 as illustrated also has three tabs 9 movable between an extended position and a retracted position relative to the first locking axis.
• the locking surface 5 has three retaining elements 11 , which when engaged with the respective tabs 9, prevent relative movement between the locking element 3 and the locking surface 5 in at least one direction of the first locking axis. While the illustrative form shows three tabs it will be appreciated that the locking assembly may include more or fewer tabs depending on requirements and space constraints.
• the locking element 3 as illustrated will now be described in detail.
• the locking element 3 comprises of a flat cylindrical, "puck” like body 4, advantageously made of metal.
• the top surface 13 is provided with a drive portion in the form socket 15 for engagement with a wrench or other drive tool.
• the illustrated socket is of a substantially square shape, it is to be appreciated other socket shapes or configurations of drive portions (such as spigots) may be used.
• a bottom surface 14 of the element 3 provides a bearing surface for the element and retains other components of the locking element 3.
• the tabs 9, which typically also made of metal are biased to project in an extended position as generally shown in Fig 1.
• the tabs 9 are movable to a retracted position, wherein the tabs 9 are displaced inwardly towards or into the peripheral side 17.
• the tabs 9 translate between the extended position and the retracted position along a movement axis that is generally perpendicular to the first locking axis, but chordal (i.e. it does not intersect the movement axis but rather forms a chord to the cylindrical body) .
• the direction of the movement axis disposed in this chordal arrangement may
• the tabs 9 are provided with a first cammed surface 19.
• the first cammed surface 19 is provided such that when the locking element 3 is rotated clockwise (as seen looking down at top surface 13), the first cammed surface 19 will be the leading surface of the tabs 9.
• the locking element 3 includes one or more biasing members within the body which are arranged to bias the tabs into their extended position.
• the biasing members are in the form of an elastomeric block 21 which is secured behind the back surface tabs 9. Compression of the elastomeric block allows the tabs to move towards their retracted position whilst imparting a biasing force on to the tabs to return to their extended position as the block tends to move back to its natural uncompressed state.
• An advantage of this arrangement is that the surface interface between the tabs and the block is effectively sealed thereby reducing the susceptibility of fines building up in the locking element that would prevent movement of the tabs to their retracted position.
• other forms of biasing may be used, including leaf or helical springs.
• the locking surface 5 is provided within a cylindrical cavity 23 of the locking ring 7. It is to be appreciated the locking surface 5 is not limited to being disposed on a locking ring 7, and may be disposed inside other shaped members.
• An opening 24 is provided at the base of the cavity 23 to provide passage for other members to bear against the bottom surface 14 of the locking element 3, when the locking assembly is in the locked condition.
• the cylindrical cavity 23 is sized to snugly fit the cylindrical body 4 of the locking element 3 to reduce the build up of dirt, fines and other loose material in the locking assembly 1.
• the locking surface 5 is provided with three evenly spaced recesses 25, to match the respective tabs 9 of the locking element 3.
• the geometry of the tabs 9 matching the recesses 25 would reduce space for the build up of foreign matter.
• the retaining element 1 1 forms at least one wall of the recess 25, which when engaged with tabs 9, prevent relative movement of the locking element and the locking surface along the first axis.
• these retaining elements are the upper under surfaces defining the recesses 25 which are in facing relation with the tabs when located in those recesses.
• Each recess 25 also includes a second cammed surface 27.
• the second cammed surface 27 cooperates with the first cammed surface 19 to move the tabs 9 towards the retracted position. It is to be appreciated however, that such a camming action does not require both the first and second cammed surface, and that one cammed surface on one component may cooperate with a respective opposing portion to facilitate camming action for movement of the tabs 9.
• the locking surface 5 is also provided with three channels 29 extending longitudinally along the cavity 23.
• the channels 29 permit the location of the locking element 3 into the cavity 23 whilst the tabs 9 are in an extended position. This allows easy insertion of the locking element 3 into the cavity 23, without tabs 9 interfering or providing undue friction.
• the channels 29 extend down the cavity 23 sufficiently to allow uninhibited insertion of the locking element 3 into the cavity along the first locking axis to a position, such that the tabs 9 are axially aligned to the recesses 25. From this position, the tabs 9 can enter the recesses 25 and engage the locking elements by relative rotation of the locking element 3 and the locking surface 5 without further relative movement along the first locking axis.
• the channels 29 are also provided with a third cammed surface 31. This surface facilitates movement of the tabs 9 towards a retracted position in the same manner as the second cammed surface 27.
• Fig. 2a illustrates the locking ring 7 having a locking surface 5 before assembly with the locking element 3.
• the tabs 9 of the locking element 3 are aligned with respective channels 29, and the cylindrical body 4 inserted into the cavity 23 of the locking ring 7.
• the channels 29 provide clearance for the tabs 9 whilst the locking element 3 is being inserted.
• the locking element 3 is positioned into the cavity 23 to a position such that the tabs 9 and the recesses 25 are on the same perpendicular plane to the first locking axis with the tabs 9 in the channels 29, and the recesses 25 angularly displaced from the channels 29 in the cylindrical cavity 23.
• the relative rotation of the locking element 3 with the locking surface 5 is described in terms of clockwise rotation around the first locking axis when seen from a top view (as illustrated).
• the angular position of the locking element 3 relative to the locking surface as shown in Fig. 2b is assigned a zero position.
• the relative angular displacement described is for ease of reference for this described embodiment, and it will be appreciated other embodiments will not be limited to specific angular displacements described below.
• the first cammed surface 19 of the tab cooperates with the third cammed surface 31 of the channels 29 to provide a camming action to move the tabs 9 towards the retracted position.
• the locking element 3 is further rotated until the tabs 9 are angularly located with the recesses 25, whereby the tabs 9 are free to move under the biasing force of the elastomeric block towards the extended position and engage with the retaining elements 11.
• This is the locked condition and is best illustrated in Fig. 2e where the locking element 3 and locking surface 5 are displaced by 60 degrees.
• the tabs 9 engage with the retaining elements 1 1 to prevent the locking element 3 from moving relative to the locking surface 5 along the first locking axis.
• the tabs 9 substantially occupy the recesses 25, thereby reducing void space where foreign material may build up.
• the locking element 3 is further rotated relative to the locking surface 5. This movement is shown in Figs. 2f- 2h.
• Fig. 2f illustrates the locking element 3 displaced by 75 degrees from the locking surface 5, whereby the tabs 9 a slightly moved towards the retracted position.
• their respective movement axes are chordal to the axis of rotation of the locking element 3. This is advantageous as the movement axes are substantially coaxial to a normal axis of the first and/or second cammed surfaces. This reduces friction and off axis forces between the tabs 9 and the body 4 of the locking element, thereby preventing binding and wear.
• the body 4 of the locking element 3 can be rotated further, as illustrated in Fig. 2h where the locking element 3 is displaced by 120 degrees from the locking surface 5.
• the locking element 3 is positioned so that the tabs 9 are now positioned within the channels 29.
• the tabs 9 have clearance to move towards the extended position, as well as being provided uninhibited movement along the channels 29. This allows for easier removal of the locking element 3 from the cavity 23 as there is reduced friction between the tabs 9 and the cavity 23.
• the lock assembly 1 does not require the application of axial forces or bias along the first locking axis when locking or unlocking the lock assembly.
• a consequence of this is the requirement to provide a void or clearance to allow for axial movement, thereby providing a space for foreign material to collect and jam the locking assembly.
• the locking element 103 has tabs 109, that has a movement axis extending radially from the first locking axis of the body 104 of the locking element 103. As illustrated in Figs. 5a to 5c showing various positions of the tabs 109 as they move radially between their extended and retracted positions.
• the locking element 203 has tabs 209, that are pivotally attached by pivots 210 to the body 204.
• the pivots 210 allow the tabs to swing outwardly between an extended position and a retracted position.
• a resilient element 221 is provided for each tab 209 to bias the tabs to the extended position.
• Figs. 8a to 8c illustrates various positions of the tabs 209 from an extended position to a retracted position.
• a further embodiment of the locking element may have tabs with additional camming surfaces on the tabs.
• the additional camming surfaces may allow the lock assembly to be locked and unlocked in both directions (i.e.
• a further alternative is to have camming surfaces on the underside of the tabs (i.e. the face when viewing towards the bottom surface 14 of the body), thereby allowing the lock element 3 to be push fit into the cavity 23 of the lock ring 7. This allows locking of the lock element 3 to the lock surface 5 without relative rotation of the lock element 3 and the lock surface 5.
• the lock element 3 may be rotated to move the tabs towards the retracted position as described in the above embodiments.
• the lock system 302 comprises of two lock assemblies 1 as previously described, and a retaining member in the form of a lock pin 306.
• the lock pin 308 has opposing end surfaces 308 for abutment with the bottom surface 14 of the locking element 3, thereby retaining the lock pin 308 in position when the lock assembly is in a locked condition.
• Figs. 10 and 1 1 illustrates the lock system 302 assembled, with the lock assemblies 1 in a locked condition to retain the lock pin 308.
• the system 302 is oriented such that end surfaces 308 are in abutment with bottom surface 14, thereby preventing the lock pin 306 from axial movment without imparting movement of one or the other of the locking element along their respective first locking axis.
• the end surface 309 and bottom surface 14 are in contact without providing any significant void or space for foreign material to collect. Also rotation of the locking element 3 during locking and unlocking, the end surface 308 and bottom surface 14 maintain this contact without producing voids. This reduces the chance of foreign material to jam the lock assembly and lock system.
• FIG. 12 illustrates an exploded view of a shackle assembly 412, comprising a shackle 414, a pin 416, and a lock system 302 described above.
• the shackle 414 has pin apertures 418 for receiving the pin 416, and two lock assembly apertures 420 for receiving respective lock assemblies 1.
• a first lock pin groove 422 is provided between the two lock assembly apertures 420.
• the pin 416 has a second lock pin groove 424 transverse to the main axis of the pin 416.
• the pin 416 is located to pass through the pin apertures 418.
• the first lock pin groove 422 of the shackle 414 and the second lock pin groove 424 of the pin 416 are aligned to form a passage for the lock pin 306 to pass through, as best illustrated in Fig.152.
• the lock pin 306 prevents the pin 416 from moving out of the pin apertures 418, thereby retaining the pin 416 relative to the shackle 414.
• the lock pin 306, in turn is retained in the passageway formed by grooves 422 and 424, by the lock assemblies 1 disposed at the lock assembly apertures 420.
• the locking ring 7 is fixed to the lock assembly apertures 420, by welding, press fit, adhesives or any other suitable method of fixing.
• the lock pin 306, once in place in the passageway formed by the grooves 422 and 424 is then retained in the passageway by locking the lock elements 3 with respective locking surfaces 5. This is best illustrated in Fig. 16. As illustrated, the bottom surfaces 14 of the locking elements 3 abut the end surfaces 308 of the lock pin 306, thereby preventing axial movement of the lock pin 306 along the first lock axis.
• the locking ring 7 has been described as a separate element fixed to the shackle, it is to be appreciated other alternatives for providing a locking surface 5 are possible.
• the locking surface 5 may be machined, cast, forged or hammered directly onto the surfaces of the two lock assembly apertures.
• the lock assembly 1 may have broader application.
• the lock assembly 1 may be used to retain the pin.
• the lock assembly may be used as part of a retention mechanism for a shroud, tooth, adaptors including, but not limited to ground engagement tools, and drag line buckets.
• FIG. 17 A further such application of the lock assembly 1 used in a lock system 500 for a connecting a shroud 502 to a bucket lip 504 is shown in Fig. 17. Similar to the earlier embodiment, the lock assembly 1 (comprising the rotatable locking element 3 and locking surface) is arranged to retain a retaining member (in the form of locking staple 506) in locked position within passage 508 that is formed by aligned through holes formed in the shroud 502 and lip 504. Insertion of the staple into passage 508 prevents the release of the shroud from the lip.
• the lock assembly is arranged to locate over the bridge 510 of the staple and is disposed within a recess of the passage.
• the locking surface 5 is formed on a ring fixed to the shroud 502 (but could be otherwise made integral with the shroud) and locking of the locking element 3to the locking surface 5prevents release of the staple from components. It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• Component Parts Of Construction Machinery (AREA)
• Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)

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• 2012
  • 2012-06-01 CN CN201280038288.0A patent/CN103842592A/zh active Pending
  • 2012-06-01 AU AU2012262670A patent/AU2012262670A1/en not_active Abandoned
  • 2012-06-01 WO PCT/AU2012/000618 patent/WO2012162749A1/en active Application Filing
• 2013
  • 2013-12-02 US US14/094,421 patent/US20140186105A1/en not_active Abandoned

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