AU2005203717A1 - Locking mechanism - Google Patents
Locking mechanism Download PDFInfo
- Publication number
- AU2005203717A1 AU2005203717A1 AU2005203717A AU2005203717A AU2005203717A1 AU 2005203717 A1 AU2005203717 A1 AU 2005203717A1 AU 2005203717 A AU2005203717 A AU 2005203717A AU 2005203717 A AU2005203717 A AU 2005203717A AU 2005203717 A1 AU2005203717 A1 AU 2005203717A1
- Authority
- AU
- Australia
- Prior art keywords
- locking
- connector
- locking element
- pin
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Description
oo
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant: BRADKEN RESOURCES PTY LIMITED A.C.N. 098 300 988 Invention Title: LOCKING MECHANISM The following statement is a full description of this invention, including the best method of performing it known to
US:
tn 2 Locking Mechanism 00 The present invention relates to locking mechanisms and more specifically mechanisms for retaining shackle pins and like elements in position in a manner which facilitates subsequent disconnection and withdrawal. A Sspecific area of application of the present invention is Cl to securing rigging pins in drag lines which are used O 10 extensively in mining operations. However the present Cl invention is not limited to this field of application.
For illustrative purposes the invention will be specifically exemplified with reference to securing pins in drag line rigging arrangements but the present disclosure extends to other fields of application.
In drag lines, a large dimension scoop or bucket is suspended and the bucket dragged for excavating ground material. Tension is applied through heavy duty mounting chains. Pins are typically used at shackles and other rigging components and these pins are subject to significant loads including substantial static and dynamic loads transverse to the axis of each pin. Such pins are also subject to abrasion, corrosion and impact stresses.
At regular intervals these pins need to be replaced at the machine work site. It is necessary that the design of the components not only safely secures the pin in position during its working period, but also facilitates rapid and safe removal and replacement of the pin at a service interval and before any risk of pin failure occurs.
Typically pins for drag line equipment are in the range of 100mm-250mm diameter with lengths of around 300mm-600mm. The pins need to be manipulated at a work J:\Speci500 599\57793.doc 3 site with transportable equipment and speed and safety in replacement operations are important requirements.
;Hitherto, one approach has been to secure such pins O in position using wedging pins which are driven into engagement and, prior to removal, are driven out of engagement with heavy hammers. Another approach is to use a cotter pin arrangement secured in position with a nut M applied to a screw threaded end portion. These arrangements however frequently provide significant delays, problems and safety issues with removal. It is (Ni now thought undesirable to use manual hammering to remove such components. Furthermore, with systems using exposed screw threaded elements problems arise due to the elements becoming immovable under normal wrench forces in a typical workplace. This then necessitates other techniques such as oxyacetylene cutting equipment being used. This requires specialist operators, slows down the process and creates significant safety issues. Most significantly, unacceptable downtown of very expensive capital equipment generally occurs.
Accordingly new and useful alternatives to known arrangements would be desirable for these and similar applications.
The present disclosure broadly concerns a concept of utilising a locking connector for securing a pin in a body, the pin being adapted to be inserted along its axis of elongation and the body retaining the pin and wherein there is adapted to be applied forces transverse to the axis of the pin; the locking connector is arranged to be mounted in a cavity associated with one of the pin and the body, and the locking connector has a locking element mounted in a mounting body and normally installed in a retracted position in the mounting body; access is J:\Speci\500 599\57793.doc n 4provided for a tool which can displace the locking element to an extended position in which it engages with the other ;of the pin, the body thereby retaining the locking element 00 in that position relative to the mounting body and for securing the pin in the body.
When applied to a drag line the present invention manifests itself, in a first aspect, in a connector system for use in a drag line, the system comprising: a) a connector pin having an elongated body extending along an axis and providing an engagement portion with a transversely directed cavity in the engagement portion providing an aperture at the surface of the engagement portion b) a rigging component having i) a receiving cavity into which the pin is adapted to be inserted by relative axially motion, ii) a locking cavity extending transversely to the pin insertion direction, and iii) means providing access for an operating a tool c) a securing connector having a main body adapted to be mounted in the transversely directed cavity of the connector pin in a non-rotatable manner (ii) a locking element mounted in the main body and having a drive element profiled to be engaged by the tool and displaced to cause the locking element to move between a retracted position to an extended locking position in which it is engaged in the locking cavity of the rigging J:\Speci\500 599\57793.doc component to retain the connector pin in the receiving cavity, and (iii) mounting means for the locking element to oo retain it in the position to which it is 00 moved by the tool and to provide for a mechanical advantage to facilitate displacement of the locking element by Sthe tool.
Cl In another aspect the invention extends to a securing connector having the features described in the previous paragraph and adapted to be used with a connector pin and a rigging component in the manner described above.
Furthermore, in another aspect the present invention consists in a connector pin adapted for use in the connector system described above.
Yet a further aspect of the invention consists in a rigging component for use in the connector system described above.
In yet a further aspect the invention consists in a drag line having at least one of the connections in the drag line assembly provided by a connector system as disclosed herein.
In yet a further aspect there is now disclosed an inventive method of mounting a pin into a rigging component of a drag line system comprising using the system as described herein.
There will now be disclosed numerous features which can be adopted singularly or in any combination in embodiments of the invention and offer specific advantageous aspects.
The present disclosure includes an embodiment in which the locking element is screw-threadably mounted in the main body thereby providing the mounting means for the J:\Speci\O0 599\57793.doc n 6p locking element and wherein frictional forces resist rotation and thus displacement of the locking element ;other than when displaced by the tool.
0O The present disclosure includes embodiments in which the leading portion of the locking element is profiled to be engaged by the tool which rotates the locking element to displace it.
The locking cavity can be of tapered form to Cl facilitate mating engagement with a corresponding taper on the locking element. This design does not need to exclude ingress of materials (such as from an ore body being worked) from around the head of the locking element.
However a seal such as an O-ring seal can be applied around the locking element to prevent ingress of foreign material into the interior of the securing connector and in particular to the elements which provide the mounting.
A spring such as the helical compression spring may be provided to exert axial pressure on the locking element thereby taking up clearance, providing friction and thereby substantially avoiding, under vibration, any displacement of the locking element and alteration of the position in which initial locking is established.
The securing connector may have an end cap remote from the locking tip of the locking element which is screw threadably engaged on the main body and provides a cover.
Embodiments can include means for limiting the degree of outward motion of the locking element. One approach is to provide a laterally inserted grub screw which is inserted in a threaded bore through the main body and which engages a reduced diameter portion of a shaft on which the locking element is mounted. For example the shaft can be provided by a bolt, the head of which is guided in an axial bore in the end cap and the opposite J:\Speci\500 599\57793.doc 7 end of which is threadably engaged into an interior blind screw-threaded bore of the locking element.
;The disclosure includes an embodiment where rotation 00 of the main body is prevented by virtue of its profile and the corresponding shaped passage in the connector pin.
This can be in the form of a generally D-shaped profile.
There is also disclosed an embodiment wherein the Ssecuring connector can be assembled to form a cartridgelike structure and the connector pin has its transversely directed cavity in the form of a constant cross-sectional shaped through-bore.
The disclosed arrangement includes providing the connector pin with a shouldered end which, when inserted to the position for securing, engages in a corresponding recess in a face of the rigging component whereby the pin is relatively orientated and alignment occurs between the transverse cavity of the connector pin and the locking cavity of the rigging component.
For illustrative purposes only reference will now be given to one embodiment described with reference to the accompanying drawings, of which:- Fig. 1 is a general arrangement of a typical drag line arrangement in which embodiments of the invention may be employed with advantage; Fig. 2 is a cross-sectional schematic illustration of a locking mechanism inserted and ready to be driven by a rotatable tool to engage in a locking position for the pin; Fig. 3 corresponds with Fig. 2 and shows the locking arrangement after use of the rotatable locking tool; Fig. 4 is an exploded view of the locking cartridge used in the illustrated embodiment; JA:\SpeciO500 599\57793.doc tf 8 Fig. 5 is an isometric view of the cartridge ready for installation; ;Fig. 6 is a view corresponding to Fig. 5 but showing 00 the cartridge after rotation of the locking element with a tool and its projection into the locking position; Fig. 7 shows a fixing pin; Fig. 8 illustrates the second embodiment with a modified fixing pin engaging with a rigging element shown in transverse cross section; Fig. 9 correspondence to Fig. 8 which shows the components in axial cross section; Fig. 10 is an exploded view of the fixing pin of the second embodiment; Fig. 11 is an assembled view on an enlarged scale in the locking position taken in axial cross section; and Fig. 12 corresponds with Fig. 11 but is in transverse cross section taken along the line XII of Fig. 11.
The drag line arrangement of Fig. 1 shows a bucket which might well have a cross-sectional dimension of around 6 metres x 4 metres, suspended by a chain arrangement 11 and coupled to drag chains 12. Fig. 1 illustrates the location of fixing pins 13 at various locations and which are secured in respective rigging components, working forces being substantially only applied at right angles to the axis of each pin which is held against rotation in the rigging component.
Typically, another element is rotatably mounted over an intermediate portion of the pin. Typically the rigging component is of the nature of a U-shaped shackle having a pair of arms each with transverse apertures of circular cross-section and in which the rigging pin is a loose fit.
There is a requirement to hold positively each rigging pin in a position in a manner which involves quick J:\Speci\500 599\57793.doc 9 p and easy installation but more importantly quick and easy removal after a period of service for replacement of ;components which are wearing. Typically the pin itself O0 will need to be placed relatively frequently and perhaps less often the associated rigging component may need to be replaced. In either case there is a need for workers in the field to be able to work quickly and safely and readily to remove and disassemble components despite aggressive working environments.
The arrangement now disclosed is shown schematically in figs. 2-7.
Referring now to Fig. 2, a fixing pin 13 is adapted to be engaged into a circular cross-section aperture 14 in a rigging component 15 in a loose fit. Typically the rigging component will comprise a U-shaped shackle having two spaced arms both of which fit over the rigging pin with a pivotal link or the like located over the rigging pin and between the arms. The whole fixing pin is shown schematically in Fig. 7 and includes a locking cartridge 20 located in a non-circular transverse bore 21 extending through the central axis of the pin close to, but spaced from, the free tip. At the opposite end, the pin 13 has a square profile head 22 having shoulders which fit into a corresponding recess (not shown) in the corresponding portion of the rigging component so that upon insertion the pin has its bore 21 aligned with corresponding structure in the rigging component.
The corresponding structure is shown in Fig. 2 and comprises a tapered cavity 23 leading to a tapered access hole 24. As discussed below, in use, a locking pin having a tip of corresponding taper to the tapered cavity 23 is inserted upon rotation of the locking pin by a tool inserted through the access hole 24.
J:\Speci\500 599\57793.doc in 10 The cartridge 20 has a main body 25 having, at one side, a flat sided projection 26 extending from a major portion which is of circular cross-section shape. Thus 00 the overall profile is generally D-shaped. This noncircular profile is provided so that upon insertion in a complementary shaped cavity in the pin, the body 20 does not rotate. At its rear end a circular cross-section cap S27 is provided. This cap has a domed free end 28 and is screw threadably engaged with the rear end of the main body 20, as most clearly shown in Fig. 2. The end cap 27 has a transverse threaded bore 28A for accommodating a grub screw 29 to limit motion of the locking element as most clearly is seen in Figs. 2 and 3.
The cartridge shown in Fig. 2 includes a cylindrical locking pin 30 having a tapered nose 31 of complementary profile to the tapered cavity in the moving component. At its rear end the locking element has a screw-threaded exterior profile 32 engaging screw-threadably with a corresponding interior threading on the main body 20. At an intermediate portion, a circumferential groove 33 is provided around the locking element for accommodating an O-ring seal to prevent the ingress of foreign matter and to retain any lubricant or corrosion prevention material that is within the cartridge. The nose includes a hexagonal-shaped aperture 34 for receiving a corresponding drive tool for rotating the locking element between the retracted position shown in Fig. 2 and the extended position shown in Fig. 3.
The locking element 30 is mounted by screw threadable engagement with the end of a guide bolt 35 having a large cylindrical head 36 which is a sliding fit in a cavity 37 in the end cap. A helical compression spring 38 surrounds the intermediate portion of the bolt and has the function J:\Speci\500 599\57793.doc 11 of exerting end pressure on the locking element to provide friction and take up of the screw threaded engagement so ;that under vibration there is no unintended reverse action 00 of the locking element and it remains firmly in engagement in the tapered cavity 23.
The grub screw 29 upon assembly is screwed in to abut the shaft of the bolt 35 and thus acts to limit the extent Sto which the locking element can be unscrewed to a projected position by interference with the head 36 as better shown in Fig. 3.
Referring now to the second embodiment of Figs. 8 12 the fixing pin 13 in this embodiment has a transverse lateral slot 41 of D-shaped cross sectional shape for accommodating a correspondingly shaped locking pin The rigging component 15 in this embodiment is plate-like and has a circular aperture therethrough for a clearance fit of the fixing pin 13 and a D-shaped transverse aperture 42 for accommodating the locking pin Uniformly spaced inwardly from each edge are upwardly directed internal cavities 43A and 43B for accommodating a locking tab 44. In this embodiment the fixing pin 40 has one locking tab 44 and the arrangement is such that it can be installed so that the tab engages either of the cavities 43A or 43B.
An actuating screw 45 has a head with a hexagonal drive cavity 46 substantially flush with the end of the locking pin 40 and, as described in more detail below, is arranged to actuate a cam when rotated to displace laterally the locking tab 44 and to retract it when required.
More detail is show in Fig. 10. The locking pin has an axially directed access bore 46 which intersects with a transverse rectangular cross sectional aperture 47 J:\Spec500 599\57793.doc f 12 for accommodating the tab 44 and an operating cam 48. The cam has a screw threaded bore 49. As seen in Fig. 12, the ;cam 48 has a peripherally extending cam groove 50 which 00 accommodates a cam pin 51 which projects as an L-shaped member from below the locking tab 44.
The screw 45 has a transverse small bore 52 therethrough for receiving a locking pin on assembly so Sthat the cam 48 moves with the screw.
Assembly is achieved by dropping the cam 48 through the cavity 47 into the enlarged cavity 47A which accommodates the cam and allows it to rotate. The screw is threadably engaged into the tapped bore 49 in the cam and the cam displaced to align the transverse bore 52 with a corresponding aperture in the cam wall (not shown) for accommodating a fixing pin.
The locking tab 44 is lowered into the cavity 47 and its cam pin inserted into the cam follower groove 50; for this purpose cam is rotated on the screw by rotation of the screw to a suitable engagement position.
Rotation of the screw then rotates the cam and draws the tab 44 down into the cavity so that the assembled locking pin can be inserted through the rigging component and the aligned fixing pin 13.
S99\57793.doc
Claims (19)
1. A connector system for use in a drag line, the system O comprising: a) a connector pin having an elongated body extending along an axis and providing an engagement portion with a transversely directed Scavity in the engagement portion providing an aperture at the surface of the engagement portion, Sb) a rigging component having i) receiving cavity into which the pin is adapted to be inserted by relative axially motion, ii) a locking cavity extending transversely to the pin insertion direction, and iii) means providing access for an operating tool, and c) a securing connector having i) a main body adapted to be mounted in the transversely directed cavity of the connector pin in a non-rotatable manner ii) a locking element mounted in the main body and having a drive element profiled to be engaged by the tool and displaced to cause the locking element to move between a retracted position to an extended locking position in which it is engaged in the locking cavity of the rigging component to retain the connector pin in the receiving cavity, and iii) mounting means for the locking element to retain it in the position to which it is J:\Speci500 599\57793.doc n 14 moved by the tool and to provide for a mechanical advantage to facilitate ;displacement of the locking element by the 00 tool.
2. A connector system as claimed in claim 1, wherein the locking element is screw-threadably mounted in the main body thereby providing the mounting means for the locking element and wherein frictional forces resist rotation and thus displacement of the locking element other than when displaced by the tool.
3. A system as claimed in claim 1 or claim 2, wherein the leading portion of the locking element is profiled to be engaged by the tool which rotates the locking element to displace it.
4. A system as claimed in any one of claims 1-3, wherein the locking cavity is tapered and the locking element has a corresponding taper.
A system as claimed in any one of claims 1-4, wherein an O-ring seal is applied around the locking element to prevent ingress of foreign material into the interior of the securing connector.
6. A system as claimed in any one of claims 1-5, and including a spring mounted to exert axial pressure on the locking element thereby taking up clearance, providing friction and thereby substantially avoiding, under vibration, any displacement of the locking element and alteration of the position in which initial locking is established. 599\57793.doc 15
7. A system as claimed in any one of claims 1-6, wherein ;the securing connector has an end cover cap remote from the locking tip of the locking element which is screw 0 threadably engaged on the main body.
8. A locking connector for securing a pin in a body, the Spin being adapted to be inserted along its axis of elongation and the body retaining the pin and wherein O 10 there is adapted to be applied forces transverse to the (1 axis of the pin; the locking connector is adapted to be mounted in a cavity associated with one of the pin and the body, and the locking connector has a locking element mounted in a mounting body and normally installed in a retracted position in the mounting body; access is provided for a tool which can displace the locking element to an extended position in which it engages with the other of the pin and the body thereby retaining the locking element in that position relative to the mounting body and for securing the pin in the body.
9. A securing connector for use in a connector system as defined in claim 1, the security connector having: a) a main body adapted to be mounted into the transversely directed cavity in the engagement portion in a non-rotatable manner b) a locking element mounted in the main body and having a drive element profiled to be engaged by the tool and to be displaced between a retracted position to an extended locking position in which it is engaged in the locking cavity of the rigging component to retain the connector pin in the receiving cavity, and J:\Speci\500 599\57793.d 16 c) mounting means for the locking element to retain it in the position to which it is moved by the ;tool and to provide for a mechanical advantage to 00 facilitate displacement of the locking element by the tool.
A locking connector as claimed in claim 9, wherein the Slocking element is screw-threadably mounted in the main body thereby providing the mounting means for the locking element and wherein frictional forces resist rotation and thus displacement of the locking element other than when displaced by the tool.
11. A locking connector as claimed in claim 10, wherein the leading portion of the locking element is profiled to be engaged by the tool which rotates the locking element to displace it.
12. A locking connector as claimed in claim 10 or claim 11, wherein the locking cavity is tapered and the locking element has a corresponding taper.
13. A locking connector as claimed in any one of claims 10-12, wherein an O-ring seal is applied around the locking element to prevent ingress of foreign material into the interior of the securing connector.
14. A locking connector as claimed in any one of claims 10-13, wherein and including a spring mounted to exert axial pressure on the locking element thereby taking up clearance, providing friction and thereby substantially avoiding, under vibration, any displacement of the locking J:\Speci500 599\57793.doc 17 element and alteration of the position in which initial locking is established.
15. A locking connector as claimed in any one of claims 00 10-14, wherein the securing connector has an end cover cap remote from the locking tip of the locking element which is screw threadably engaged on the main body. CI
16. A connector pin having an elongated body extending along an axis and providing an engagement portion with a CI transversely directed cavity in the engagement portion providing an aperture at the surface of the engagement portion, the connector pin being suitable for use in a connector system as claims in any one of claims 1-7.
17. A rigging component having a) a receiving cavity into which the pin is adapted to be inserted by relative axially motion, b) a locking cavity extending transversely to the pin insertion direction, and c) a passageway for providing access for a tool, and the rigging component being suitable for use in a connector system as claimed in any one of claims 1-7
18. A drag line having apparatus as defined in any one of the preceding claims.
19. A method of operating a drag line comprising using in the drag line apparatus as claimed in any one of the preceding claims and periodically using a tool to remove and replace worn components. J:\Speci\500 599\57793.doc 18 Apparatus for use in securing a drag line bucket to drag cables substantially as herein described with Sreference to any one of the embodiments described and 0 shown in the drawings. J:\Speci\500 599\57793.doc
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2005203717A AU2005203717A1 (en) | 2004-08-20 | 2005-08-18 | Locking mechanism |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2004904765 | 2004-08-20 | ||
| AU2004904765A AU2004904765A0 (en) | 2004-08-20 | Locking mechanism | |
| AU2005203717A AU2005203717A1 (en) | 2004-08-20 | 2005-08-18 | Locking mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2005203717A1 true AU2005203717A1 (en) | 2006-03-09 |
Family
ID=36102796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2005203717A Abandoned AU2005203717A1 (en) | 2004-08-20 | 2005-08-18 | Locking mechanism |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2005203717A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013090996A1 (en) * | 2011-12-21 | 2013-06-27 | L & H Industrial Australia Pty Ltd | Retainer systems |
| AU2011253753B2 (en) * | 2011-11-30 | 2014-10-09 | 2Mt Mining Products Pty Ltd | Dragline pin locking device |
| WO2016019412A1 (en) * | 2014-08-07 | 2016-02-11 | 2Mt Mining Products Pty Ltd | Rigging components and locking pins therefor |
| NL2013750B1 (en) * | 2014-11-07 | 2016-10-06 | Southwest Eng B V | Retainer system for securing a pin, a pin adapted to said retainer system, and an article suitable for use of said pin and retainer system. |
| AU2012202881B2 (en) * | 2011-05-18 | 2016-12-08 | Simco Mining Products & Services Pty Ltd | Shackle assemblies and components for shackle assemblies |
| CN107736968A (en) * | 2017-11-28 | 2018-02-27 | 任风美 | Spliced medical nursing sick bed and its plug component |
| US10041231B2 (en) * | 2016-04-28 | 2018-08-07 | Raptor Mining Products Inc. | Excavator tooth retention apparatus |
| CN110783771A (en) * | 2018-07-31 | 2020-02-11 | 意大利汽车照明股份公司 | Device, system and method for assembling an electrical connector in a lighting device of a vehicle |
-
2005
- 2005-08-18 AU AU2005203717A patent/AU2005203717A1/en not_active Abandoned
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2012202881B2 (en) * | 2011-05-18 | 2016-12-08 | Simco Mining Products & Services Pty Ltd | Shackle assemblies and components for shackle assemblies |
| AU2011253753B2 (en) * | 2011-11-30 | 2014-10-09 | 2Mt Mining Products Pty Ltd | Dragline pin locking device |
| US9163378B2 (en) | 2011-11-30 | 2015-10-20 | Columbia Steel Casting Co., Inc. | Pin retainer for dragline pins |
| US9951499B2 (en) | 2011-12-21 | 2018-04-24 | Simco Mining Products & Services Pty Ltd | Retainer systems |
| AU2016203506B2 (en) * | 2011-12-21 | 2017-09-07 | Simco Mining Products And Services Pty Ltd | Retainer systems |
| AU2012268800B2 (en) * | 2011-12-21 | 2017-10-26 | Simco Mining Products & Services Pty Ltd | Retainer systems |
| WO2013090996A1 (en) * | 2011-12-21 | 2013-06-27 | L & H Industrial Australia Pty Ltd | Retainer systems |
| WO2016019412A1 (en) * | 2014-08-07 | 2016-02-11 | 2Mt Mining Products Pty Ltd | Rigging components and locking pins therefor |
| NL2013750B1 (en) * | 2014-11-07 | 2016-10-06 | Southwest Eng B V | Retainer system for securing a pin, a pin adapted to said retainer system, and an article suitable for use of said pin and retainer system. |
| US10041231B2 (en) * | 2016-04-28 | 2018-08-07 | Raptor Mining Products Inc. | Excavator tooth retention apparatus |
| CN107736968A (en) * | 2017-11-28 | 2018-02-27 | 任风美 | Spliced medical nursing sick bed and its plug component |
| CN107736968B (en) * | 2017-11-28 | 2019-08-30 | 任风美 | Spliced medical nursing hospital bed and its plug component |
| CN110783771A (en) * | 2018-07-31 | 2020-02-11 | 意大利汽车照明股份公司 | Device, system and method for assembling an electrical connector in a lighting device of a vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK1 | Application lapsed section 142(2)(a) - no request for examination in relevant period |