DK9600271U3 - Trailed mower with a drawbar hinged at one side. - Google Patents
Trailed mower with a drawbar hinged at one side. Download PDFInfo
- Publication number
- DK9600271U3 DK9600271U3 DK9600271U DK9600271U DK9600271U3 DK 9600271 U3 DK9600271 U3 DK 9600271U3 DK 9600271 U DK9600271 U DK 9600271U DK 9600271 U DK9600271 U DK 9600271U DK 9600271 U3 DK9600271 U3 DK 9600271U3
- Authority
- DK
- Denmark
- Prior art keywords
- mower
- support frame
- transport
- wheels
- axis
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/64—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle
- A01D34/66—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle with two or more cutters
- A01D34/661—Mounting means
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B73/00—Means or arrangements to facilitate transportation of agricultural machines or implements, e.g. folding frames to reduce overall width
- A01B73/005—Means or arrangements to facilitate transportation of agricultural machines or implements, e.g. folding frames to reduce overall width for endwise transportation, i.e. the direction of transport being substantially perpendicular to the direction of agricultural operation
Description
1DK 96 00271 U31DK 96 00271 U3
Den foreliggende frembringelse angår en bugseret slåmaskine med en langstrakt bæreramme, slåorganer indrettet langs en akse, der strækker sig i bærerammens længderetning, en trækstang hængslet til bærerammen om en lodret hængselakse ved bærerammens ene ende, ved eller foran slåorganernes akse og indrettet til forbindelse med en traktor, sænkbare arbejdshjul indrettet ved hver sin ende af bærerammen for at bære slåmaskinen under drift, hvorved slåmaskinen fremføres i en retning på tværs af bærerammens længderetning, og hæv- og sænkbare transporthjul monteret på hver sin side af bærerammen for at bære slåmaskinen under transport i det væsentlige i bærerammens længderetning med den ende, hvortil trækstangen er hængslet, forrest.The present invention relates to a towed mower with an elongated support frame, mowing means arranged along an axis extending longitudinally of the support frame, a tow bar hinged to the support frame about a vertical hinge axis at one end of the support frame, at or in front of the mower axis and arranged for connection with a a tractor, lowerable working wheels arranged at each end of the support frame for carrying the mower during operation, thereby driving the mower in a direction transversely of the longitudinal direction of the support frame, and raising and lowering transport wheels mounted on each side of the support frame for carrying the mower during transport in substantially in the longitudinal direction of the support frame with the end to which the drawbar is hinged, at the front.
Slåmaskiner af denne art kendes eksempelvis fra markedsføring af firmaet KRONE under betegnelserne AMT 4000 CV og AMT 5000 CV.Mowers of this kind are known, for example, from the marketing of the company KRONE under the designations AMT 4000 CV and AMT 5000 CV.
Slåmaskiner af den omhandlede art trækkes under drift efter en traktor, således at slåmaskinen strækker sig ud til den ene side, eksempelvis den højre for traktorens spor. Ved at bygge maskinen spejlvendt, kan den indrettes til at blive bugseret til venstre for traktorens spor. I denne beskrivelse er imidlertid som eksempel anvendt maskiner der strækker sig ud til den højre side.Mowers of the type in question are pulled during operation after a tractor, so that the mower extends to one side, for example the right of the tractor track. By building the machine in reverse, it can be designed to be towed to the left of the tractor track. However, in this description, machines extending to the right side are used as an example.
Det er ønskeligt at bygge sådanne maskiner med en stor arbejdsbredde for at minimere det antal gange en mark skal overkøres for at slå afgrøden på den. Det er endvidere ønskeligt at minimere længden af trækstangen for at forbedre manøvreegenskaberne af den samlede ekvipage, traktor og slåmaskine, ved vendinger på marken. DeivuJ w^j.CLiL , £ ordi slåmaskxilcna tyngdepunkt kommer tæt på en linie mellem det højre eller yderste arbejdshjul og trækstangens forbindelses-punkt til traktoren. Derved bliver slåmaskinen til- 2 2DK 96 00271 U3 bøjelig til at få overbalance og vælte forover, navnlig hvis der arbejdes i kuperet terræn.It is desirable to build such machines with a large working width to minimize the number of times a field has to be traversed to hit the crop on it. Furthermore, it is desirable to minimize the length of the drawbar to improve the maneuverability of the overall equipage, tractor and mower, in the field. DeivuJ w ^ j.CLiL, £ ordi mower xilcna center of gravity comes close to a line between the right or outer working wheel and the connecting point of the drawbar to the tractor. This makes the mower 2 2DK 96 00271 U3 flexible to overbalance and overturn, especially if working in hilly terrain.
KRONE's ovennævnte maskiner er udstyret med en koblingsramme til forbindelse med traktoren, hvorved 5 trækstangens forbindelsespunkt flyttes ud til traktorens højre side, hvorved ovennævnte problem mindskes. Til gengæld fås en mere kompliceret transmission af akseleffekt fra traktoren til slåmaskinen samt et drej -ningsmoment omkring traktorens længdeakse. Desuden er 10 det ene transporthjul monteret på en bærearm, som kan svinges om en akse parallel med slåorganernes akse mellem en lodret transportstilling og en vandret bagudragende arbejdsstilling, hvorved slåmaskinens tyngdepunkt i arbejdsstillingen flyttes bagud. En sådan 15 indretning af ophænget for et arbejdshjul kendes også fra US-A-4 986 084, som angår en slåmaskine, hvis trækstang er hængslet nær slåmaskinens langsgående midterplan. Denne indretning af transporthjulsophænget har den ulempe, at slåmaskinen skal løftes før trans-20 porthjulet kan bringes i transportstilling, fordi transporthjulet ellers ville blive slæbt sidelæns hen over marken.KRONE's aforementioned machines are equipped with a coupling frame for connection with the tractor, whereby the connecting point of the drawbar is moved out to the right side of the tractor, thereby reducing the above problem. In contrast, a more complicated transmission of axle power is obtained from the tractor to the mower as well as a torque around the longitudinal axis of the tractor. In addition, one transport wheel is mounted on a support arm which can be pivoted about an axis parallel to the axis of the mowing means between a vertical transport position and a horizontal rearward projecting position, whereby the mower's center of gravity in the working position is moved backwards. Such a device for the suspension of a working wheel is also known from US-A-4 986 084, which relates to a mower whose drawbar is hinged near the longitudinal median plane of the mower. This arrangement of the transport wheel suspension has the disadvantage that the mower must be lifted before the transport wheel can be brought into transport position, because otherwise the transport wheel would be towed sideways across the field.
Formålet med den foreliggende frembringelse er at tilvejebringe en slåmaskine af den indledningsvis 25 anførte art, som ikke er behæftet med de omtalte ulemper ved den kendte teknik.The object of the present invention is to provide a mower of the kind initially mentioned, which does not suffer from the aforementioned disadvantages of the prior art.
Dette opnås ved, at nævnte hængsel og arbejds-hjulet nærmest dette er placeret sideværts uden for slåorganernes spor under drift, og at transporthjulenes 30 ophæng er således indrettet, at transporthjulene ved deres hævning og sænkning bevæges i deres respektive planer vinkelret på______ _____Herved opnås for det første en ønsket forskydning af slåmaskinens tyngdepunkt i retning mod den side, hvor trækstangen er 35 hængslet, og for det andet, at slåmaskinen kan løftes 3 3DK 96 00271 U3 ved sænkning af transporthjulene, hvilket muliggør et mere enkelt, eksempelvis hydraulisk, drivsystem til hævning og sænkning af diverse hjul.This is achieved by the said hinge and the working wheel closest to it being positioned laterally outside the tracks of the striking means during operation, and that the suspension of the transport wheels 30 is arranged so that, by their raising and lowering, the transport wheels are moved perpendicular to ______ _____. first, a desired displacement of the mower's center of gravity towards the side where the drawbar is hinged, and second, that the mower can be lifted 3DK 96 00271 U3 by lowering the transport wheels, enabling a simpler, e.g. hydraulic, drive system for raising and lowering various wheels.
Således er transporthjulene ifølge en foretrukket 5 udførelsesform gennem deres ophæng således forbundet, at de hæves og sænkes sammen. Derved opnås, at der kun skal anvendes et enkelt dobbeltvirkende kraftudtag til hævning og sænkning af transporthjulene. I modsætning hertil anvendes ved de ovenfor omtalte maskiner to 10 kraftudtag, idet transporthjulene hæves og sænkes separat og på forskellige tidspunkter.Thus, the transport wheels of a preferred embodiment are connected through their suspension so that they are raised and lowered together. This results in the use of only a single double-acting power take-off for raising and lowering the transport wheels. In contrast, with the above-mentioned machines, two power take-offs are used, the transport wheels being raised and lowered separately and at different times.
Transporthjulene kan passende være monteret for enden af hver sin gren af en i det væsentlige U-formet bøjle, hvis bund er monteret drejelig om en akse ved 15 hjælp af et kraftorgan på bærerammen.Conveniently, the transport wheels may be mounted at the end of each branch of a substantially U-shaped bracket, the bottom of which is mounted pivotally about an axis by means of a force member on the support frame.
Trækstangen er fortrinsvis indrettet til forbindelse med traktoren ved dennes langsgående midterplan. Derved opnås en forholdsvis enkel indretning af transmissionen af akseleffekt fra traktoren til slåma-20 skinen og drejningsmomentet omkring traktorens længdeakse undgås.The drawbar is preferably arranged for connection with the tractor at its longitudinal median plane. Thereby, a relatively simple arrangement of the transmission of shaft power is obtained from the tractor to the mower and the torque around the longitudinal axis of the tractor is avoided.
Endelig er transporthjulene i det mindste i transportstillingen i forhold til slåorganernes midterplan på tværs af deres akse forskudt mod slåmaskinens 25 tyngdepunkt. Derved opnås, at afstanden mellem transporthjulene og traktoren mindskes, hvilket forbedrer manøvreegenskaberne for den samlede ekvipage.Finally, at least in the transport position relative to the median plane across the axis of the mower, the transport wheels are offset against the center of gravity of the mower 25. This reduces the distance between the transport wheels and the tractor, which improves the maneuverability of the overall equipage.
Frembringelsen vil blive nærmere forklaret i det følgende ved hjælp af et udførelseseksempel under 30 henvisning til tegningen, på hvilken fig. 1 viser en slåmaskine ifølge frembringelsen oppefra og fig. 2a-2c en skematisk fremstilling af omstillingen fra arbejdsstilling til transportstilling for 35 slåmaskinen i fig. 1.The invention will be explained in more detail below with the aid of an exemplary embodiment with reference to the drawing, in which fig. 1 shows a mower according to the invention from above, and FIG. 2a-2c are a schematic representation of the transition from working position to transport position of the mower in FIG. First
4 4DK 96 00271 U34 4DK 96 00271 U3
Den viste slåmaskine omfatter en L-formet bæreramme 1, på hvilken er hængslet en trækstang 2 gennem et hængsel 3, hvilken trækstang 2 er vinkeljusterbar i forhold til bærerammen 1 ved hjælp af en hydraulisk 5 cylinder 4 mellem en arbejdsstilling og en transportstilling som vist i henholdsvis fig. 2a og 2c.The mower shown comprises an L-shaped support frame 1 on which is hinged a drawbar 2 through a hinge 3, which drawbar 2 is angularly adjustable to the support frame 1 by means of a hydraulic cylinder 5 between a working position and a transport position as shown in FIG. FIG. 2a and 2c.
På bærerammen 1 er monteret arbejdshjul 5 gennem hver sin bærearm 6. Slåmaskinens arbejdsaggregat omfatter et antal knivskiver 7, i de viste tilfælde ni 10 stykker, og er ophængt i bærerammen 1 ved hjælp af ledstænger og fjedre 9 på i og for sig kendt vis. Arbejdsaggregatet er fortil forsynet med en sikkerhedsafskærmning i form af en dækplade 10 med en nedhængende afskærmningsdug.On the support frame 1 are mounted working wheels 5 through each of the support arms 6. The mower's working assembly comprises a plurality of cutting discs 7, in the cases shown nine 10 pieces, and is suspended in the support frame 1 by means of handrails and springs 9 in a manner known per se. The work unit is provided with a front guard in the form of a cover plate 10 with a hanging guard cloth.
15 Bagtil er arbej dsaggregatet forsynet med en. skærm indretning 14, som tilvejebringer en udkaståbning for slået materiale.15 At the rear, the work unit is equipped with one. screen device 14 which provides a discharge opening for struck material.
På bærerammen 1 er monteret en bærebøsning 18, gennem hvilken en drejeligt lejret aksel 19 strækker 20 sig. Fra akslen 19's ender strækker sig bærearme 20 for transporthjul 21. Akslen 19 og bærearmene 20 danner således en i det væsentlige U-formet bøjle. Akslen 19 kan drejes ved hjælp af en hydraulisk cylinder 22, som gennem en hængseltap 23 er i indgreb med to parallelle 25 arme 24 på akslen 19.Mounted on the support frame 1 is a support bush 18 through which a rotatably mounted shaft 19 extends 20. From the ends of shaft 19, support arms 20 extend for transport wheels 21. The shaft 19 and support arms 20 thus form a substantially U-shaped hanger. The shaft 19 can be turned by means of a hydraulic cylinder 22 which, through a hinge pin 23, engages two parallel 25 arms 24 of the shaft 19.
Under drift fremføres slåmaskinen som vist i fig. 2a, idet den bæres af arbejdshjulene 5 og transporthjulene 21 er løftet. Med en streg 26 er indikeret, hvor langt til venstre slåorganerne strækker sig. Hængslet 30 3 og det venstre arbejdshjul 5 befinder sig indenfor sporet af den trækkende traktor 27, som er symboliseret vod oine baghjul og ------ng-indretning eksempelvis dens tre-punktslift. Ved denne placering af hængslet 3 og det venstre arbejdshjul 5 opnås en forskydning af 35 slåmaskinens tyngdepunkt 29 mod venstre fra det lodret- 5 5DK 96 00271 U3 te midterplan 30 for slåorganerne, som konventionelt også er midterplan for slåmaskinen som helhed. Ved denne forskydning flyttes tyngdepunktet 29 væk fra linien mellem trækstangen 2's forbindelsespunkt 28 på 5 traktoren og det højre arbejdshjul 5, hvilket modvirker en tendens for slåmaskinen til at få overbalance. Denne forskydning af tyngdepunktet kan forøges ved at forsyne det venstre arbejdshjul 5 med vægte 25 som vist i fig. 1.In operation, the mower is advanced as shown in FIG. 2a, being carried by the working wheels 5 and the transport wheels 21 is lifted. A dash 26 indicates how far to the left the striking means extend. The hinge 30 3 and the left working wheel 5 are within the groove of the tractor 27, which is symbolized by the rear wheels and ------ ng device, for example its three-point lift. At this location of the hinge 3 and the left working wheel 5, a displacement of the center of gravity 29 of the mower towards the left is obtained from the vertical median plane 30 of the mower, which is conventionally also the median plane of the mower as a whole. In this offset, the center of gravity 29 is moved away from the line between the connecting point 28 of the drawbar 2 of the 5 tractor and the right working wheel 5, which counteracts a tendency for the mower to overbalance. This displacement of the center of gravity can be increased by providing the left working wheel 5 with weights 25 as shown in FIG. First
10 Ved omstilling til transport af slåmaskinen i en retning på tværs af arbejdsretningen sænkes transporthjulene 21 ved hjælp af den hydrauliske cylinder 22. Dette kan gøres uden problemer, fordi hjulene bevæges i deres egne rotationsplaner, hvorved hjulene 15 ruller hen over marken fra den position, hvori de først berører marken når de sænkes, til deres endelige transportstilling.10 When switching to transport the mower in a direction transverse to the working direction, the transport wheels 21 are lowered by the hydraulic cylinder 22. This can be done without problems, because the wheels are moved in their own rotation planes, whereby the wheels 15 roll over the field from the position, in which they first touch the field when lowered, to their final transport position.
Med hensyn til arbejdshjulene 5's hævning og sænkning er der flere muligheder: Enten kan de (gennem 2 0 deres bærearme 6) bevæges op og ned efter behov af dobbeltvirkende hydrauliske cylindre, eller de kan være betjent af enkeltvirkende cylindre, som sænker dem efter behov, hvorved opnås en tilsvarende hævning af slåmaskinen. Ved sidstnævnte mulighed skal arbejds-25 hjulene kunne låses fast i en ikke sænket stilling. I det første tilfælde er arbejdshjulene 5 løftet ved hjælp af deres cylindre, når slåmaskinen er i transportstilling båret af transporthjulene 21. I det andet tilfælde sænkes slåmaskinen og arbejdshjulene 5 låses 30 fast inden transporthjulene 21 sænkes, hvorved arbejds-hjulene 5 løftes sammen med slåmaskinen.Regarding the raising and lowering of the working wheels 5, there are several options: Either (through their supporting arms 6) they can be moved up and down as required by double acting hydraulic cylinders, or they can be operated by single acting cylinders which lower them as needed. thereby obtaining a corresponding raising of the mower. In the latter option, the working 25 wheels must be able to be locked in a non-lowered position. In the first case, the working wheels 5 are lifted by their cylinders when the mower is in transport position carried by the transport wheels 21. In the second case, the mower is lowered and the working wheels 5 are locked 30 before the transport wheels 21 are lowered, thereby lifting the working wheels 5 together with the mower .
Som det fremgår ar j-a^· ei «-xauspor Lu julene 21's akse 31 placeret til højre for tyngdepunktet 29, hvilket betyder at traktoren 27 bærer en (begrænset) 6 6DK 96 00271 U3 del af slåmaskinens vægt, hvilket har betydning for køreegenskaberne.As can be seen, the axis 31 of the Christmas 21 axis is located to the right of the center of gravity 29, which means that the tractor 27 carries a (limited) 6DK 96 00271 U3 part of the mower's weight, which has a bearing on the driving characteristics.
Den videre omstilling efter at transporthjulene 21 er sænket og arbejdshjulene 5 hævet tilvejebringes ved 5 svingning (fig. 2b) af trækstangen 2 ved hjælp af cylinderen 4. Under denne del af omstillingen ruller slåmaskinen på transporthjulene 21.The further adjustment after the transport wheels 21 are lowered and the working wheels 5 raised are provided by 5 pivots (Fig. 2b) of the drawbar 2 by means of the cylinder 4. During this part of the adjustment, the mower rolls on the transport wheels 21.
Fig. 2c viser slåmaskinen i transportstilling efter endt omstilling. Det bemærkes at den svingning 10 trækstangen 2 har gennemgået fra arbejdsstilling (fig. 2a) til transportstilling (fig. 2c) er mindre end 90°, hvilket gør det muligt at anvende en konventionel kraftoverføringsaksel i transmissionsforbindelsen mellem trækstang 2 og bæreramme 1, hvorved denne aksel 15 kan forblive monteret under omstillingen. Det bemærkes endvidere at transporthjulene 21 i forhold til deres konventionelle placering ved midterplanet 30 er flyttet nærmere traktoren 27, hvilket mindsker ekvipagens venderadius.FIG. 2c shows the mower in transport position after the conversion has been completed. It should be noted that the oscillation 10 of the drawbar 2 passed from the working position (Fig. 2a) to the transporting position (Fig. 2c) is less than 90 °, which makes it possible to use a conventional PTO shaft in the transmission connection between the drawbar 2 and carrier frame 1, shaft 15 may remain mounted during the shift. It is further noted that, relative to their conventional location at the median plane 30, the transport wheels 21 are moved closer to the tractor 27, which reduces the turning radius of the equipage.
20 Det fremgår af fig. 1 at dækpladen 10 i arbejds stilling befinder sig under det ene transporthjul 21, hvorfor den må flyttes for omstillingen til transport. Dette problem er behandlet i en patentansøgning indleveret samme dato som den foreliggende ansøgning for 25 den samme ansøger.20 It can be seen from FIG. 1 that the cover plate 10 is in working position under one of the transport wheels 21, so it must be moved for the transfer to transport. This problem is addressed in a patent application filed on the same date as the present application for the same applicant.
Claims (5)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK9600271U DK9600271U3 (en) | 1996-08-15 | 1996-08-15 | Trailed mower with a drawbar hinged at one side. |
| FR9710314A FR2752356B3 (en) | 1996-08-15 | 1997-08-13 | TRACTED MOWER WITH DRAWBAR ARTICULATED ON A SIDE |
| DE29714523U DE29714523U1 (en) | 1996-08-15 | 1997-08-13 | Trailed mower with a drawbar attached to the side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK9600271U DK9600271U3 (en) | 1996-08-15 | 1996-08-15 | Trailed mower with a drawbar hinged at one side. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DK9600271U3 true DK9600271U3 (en) | 1997-11-28 |
Family
ID=8155698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK9600271U DK9600271U3 (en) | 1996-08-15 | 1996-08-15 | Trailed mower with a drawbar hinged at one side. |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE29714523U1 (en) |
| DK (1) | DK9600271U3 (en) |
| FR (1) | FR2752356B3 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK175415B1 (en) * | 2003-01-20 | 2004-10-04 | Freudendahl J Fab As | Trailed mower |
| US9622404B2 (en) | 2013-09-11 | 2017-04-18 | Cnh Industrial America Llc | Integral lateral transport of a mower |
| US9596808B2 (en) | 2014-04-30 | 2017-03-21 | Cnh Industrial America Llc | Transport system for a center pivot agricultural machine |
| US9603306B2 (en) | 2014-07-09 | 2017-03-28 | Cnh Industrial America Llc | Agricultural machine with retaining elements for retaining a header in an elevated position |
| US9565800B2 (en) | 2014-09-08 | 2017-02-14 | Cnh Industrial America Llc | Windrow shield control system for a header of an agricultural harvester |
| JP6911057B2 (en) | 2016-02-18 | 2021-07-28 | シードマスター マニュファクチャリング エルティーディー． | Equipment for operating equipment |
| CA2964610C (en) | 2016-04-19 | 2022-08-09 | Seedmaster Manufacturing Ltd. | Agricultural implement and ramp attachment system |
| US11497168B2 (en) | 2020-03-26 | 2022-11-15 | Cnh Industrial America Llc | Lateral transport system for an agricultural mower with non-parallel axes of transport deployment and wheel rotation |
-
1996
- 1996-08-15 DK DK9600271U patent/DK9600271U3/en not_active IP Right Cessation
-
1997
- 1997-08-13 DE DE29714523U patent/DE29714523U1/en not_active Expired - Lifetime
- 1997-08-13 FR FR9710314A patent/FR2752356B3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE29714523U1 (en) | 1997-10-09 |
| FR2752356B3 (en) | 1998-07-24 |
| FR2752356A3 (en) | 1998-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| UUP | Utility model expired |