EP0661234A1 - Grue mobile avec un flèche télescopique - Google Patents
Grue mobile avec un flèche télescopique Download PDFInfo
- Publication number
- EP0661234A1 EP0661234A1 EP94116337A EP94116337A EP0661234A1 EP 0661234 A1 EP0661234 A1 EP 0661234A1 EP 94116337 A EP94116337 A EP 94116337A EP 94116337 A EP94116337 A EP 94116337A EP 0661234 A1 EP0661234 A1 EP 0661234A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- telescopic
- locking
- piston
- cylinder
- cylinder unit
- 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.)
- Granted
Links
- 238000010168 coupling process Methods 0.000 claims description 14
- 238000005859 coupling reaction Methods 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 12
- 239000011324 bead Substances 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/708—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic locking devices for telescopic jibs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
Definitions
- the invention relates to a mobile crane with a telescopic boom, the individual, telescopic shots after releasing locking bolts connections with only a single-stage, hydraulic piston-cylinder unit can be extended and retracted and in the respective extended or retracted positions by in the direction spring-loaded locking bolts are bolted to their locked positions, in which the piston rod of the piston-cylinder unit is articulated to the boom coupling piece that closes the inner end of the outer shot, and a driver device that can be coupled with receptacles of the telescopic shots in the area of the Is arranged end of the cylinder from which the piston rod emerges.
- the outer shot and the telescopic shots have spring-loaded locking bolts at their outer ends on opposite sides symmetrically to the luffing plane, which engage in bores of the shots each enclosed by them and by means of pneumatic bolting cylinders against spring force can be moved out of the locking holes and can be locked in the locking holes by ventilation.
- extendable and retractable supply lines must be laid in the individual sections of the telescopic boom in order to To be able to supply bolted cylinders with compressed air.
- the arrangement of supply lines in the telescopic boom is not only complex, but also requires larger gaps between the individual shots or telescopic shots, so that the telescopic shots essentially cannot cover the entire cross-section of the shots surrounding them, but rather are made with correspondingly smaller cross-sections Need to become.
- the object of the invention is therefore to provide a crane of the type specified in the introduction, in which the bolting cylinders of the individual shots with associated supply lines are eliminated.
- this object is achieved in a crane of the generic type in that each of the telescopic shots is provided at its inner end with at least one locking bolt which is locked by a spring in the radial extension direction for locking with one at the inner or outer end of this shot Shot located bore is loaded that the locking bolt is provided at its inner end with a coupling piece which can be coupled in the locking position of the locking bolt with a piston or a piston rod of a hydraulic piston-cylinder unit arranged radially at the outlet end of the piston rod of the cylinder, and that means are provided which move the cylinder into the coupling position in a precise position.
- the individual telescopic shots are only provided at their inner ends with radially movable, spring-loaded locking bolts, all of which can be actuated with a common piston-cylinder unit arranged on the extension and retraction cylinder, so that each cylinder is assigned a bolting cylinder or actuating devices for the locking bolts are omitted.
- Each telescopic shot is expediently provided with only one locking bolt, the associated bores in the top of the profile of the enclosing shots being in their horizontal position.
- the coupling pieces of all locking bolts consist of circular disks which are connected to the locking bolt by means of shafts and are in a common axial plane, that the counter-coupling piece of the radial piston-cylinder unit runs in the axial direction , channel-shaped section with a U-shaped profile, which is provided at the free ends of its legs with inwardly pointing webs, that the webs delimit a gap between them, the width of which corresponds to the diameter of the shaft, and that the legs are spaced apart from one another have, which corresponds to the diameter of the discs.
- the individual locking bolts can be coupled with the piston-cylinder unit that actuates them by moving them into coupling engagement with the coupling bolt, the coupling being able to be effected simply by the channel-shaped section running over the clutch disc .
- the radial piston-cylinder unit for pulling in the locking bolt can only be actuated when the driver device is coupled to the receptacles of the shot that extracts or extracts from the bag. This ensures that the individual telescopic shots are never in an unlocked state.
- the receptacles expediently consist of bores or bushings for retractable locking bolts, the driver device being formed from a block with opposing cylinders for the retractable and retractable bolts formed by their pistons or piston rods.
- the bores consist of elongated holes extending in the axial direction and the locking bolts have circumferential collars or beads at their outer ends. Since the locking bolts are supported on the ends of the elongated holes, they overlap the elongated holes with their collars or beads, so that an additional safeguard against unintentional, automatic loosening of the bolt is created.
- the means positioning the cylinder expediently consist of reflection light barriers attached to the latter, which scan marks attached to the shots.
- the shots expediently consist of profiles, the top of which are formed from U-shaped pieces, the legs of which are welded to the edges of lower, semicircular or semi-oval shells.
- profiles of the individual shots of the telescopic boom are known from EP 0 499 208 A2.
- the telescopic crane according to the invention is characterized by a very simple and safe construction. All limit switches as well as electrical and hydraulic parts are located on the telescopic cylinder. No special energy supply is required to lock the individual telescopic sections. This eliminates all energy supply lines, so-called “energy supply chains", switch boxes and the other associated devices.
- all locking devices are located on the end pieces and can be welded or processed in one device.
- the individual telescopic sections with their cross sections can fill the cross sections of the enclosing sections more completely, so that better load capacities are achieved with a reduced deflection of the boom.
- a single-stage piston-cylinder unit 7 is provided for telescoping and retracting the individual telescopic sections 3 to 6, a single-stage piston-cylinder unit 7 is provided.
- the outer shot 2 is closed at its inner end by the boom link 8.
- This boom link 8 has two forked bearing legs 9, 10 with aligned bearing bores 11, via which the outer section 2 is pivotally mounted in the usual manner on a pivot axis in the superstructure of a crane vehicle.
- the piston rod of the rocker cylinder is also articulated in a manner not shown.
- the piston rod 12 of the single-stage, hydraulic piston-cylinder unit 7 is provided at its inner end with a head piece 13, via which it is articulated on the boom articulation piece 8.
- the cylinder 18 of the piston-cylinder unit 7 is provided at the outlet end of the piston rod 12 with a collar 19 which has cylinder bores on opposite sides in the longitudinal center plane, in which locking bolts 20, 21 are guided as pistons.
- the telescopic sections 3 to 6 carry at their inner ends welded, frame-shaped end pieces 22 to 25, which are provided on opposite sides symmetrically to the luffing plane of the telescopic boom 1 with cup-shaped bushings 26 which form receptacles for the locking bolts 20, 21.
- the center lines of the bores of the receptacles each have the same distances from one another. So far, the telescopic boom corresponds to the telescopic boom according to EP 0 476 225 A2.
- the telescopic sections 3 to 6 have spring-loaded locking bolts at their ends in the middle of their upper walls 30 to 33. These locking bolts are guided longitudinally displaceably in bores in the top walls of the telescopic shots and are loaded in the direction of extension by compression springs 34 which are supported on the one hand on stops 35 forming collars and on the other hand on step-like recesses of covers 36 which close a housing-like cage of the locking bolts. With the collars 35, the locking bolts are supported on the inner edges of the bores in the top walls of the telescopic shots.
- the locking bolts 30 to 33 have shafts 37 at their inner ends, which are provided with circular disks 38 at their inner ends. 3, the disks 38 are located in a common plane.
- the shots 2 to 5 have at their inner and outer ends bores 39, in which the locking bolts 30 to 33 engage for locking. At their free ends passing through the locking bores 39, the locking bolts are provided with circumferential, annular beads 40 which serve to secure against unintentional loosening.
- the outer locking bores 39 are designed as elongated holes extending in the axial direction. In the locked position of the extended shots, the locking bolts are supported on the inner ends of the elongated holes 39, so that the annular beads 40 overlap the lower edge of the locking bore 39 in the manner shown in FIG. 6.
- the telescopic cylinder 18 is in the region of its exit collar of the piston rod 12 perpendicular to the horizontal plane in which the cylinder bores with the locking bolts 20, 21 are provided on its upper side with a further piston-cylinder unit 50, the piston 51 of which is on his upper free end is provided with a groove-shaped recess 52 which extends in the axial direction.
- This trough-shaped recess is U-shaped in cross section, with webs 53 being attached to the upper ends of the legs, which delimit a gap between them through which the shaft 37 of the locking bolts 30 to 33 can pass.
- the respective circular disk 38 is located within the channel-shaped section in the manner shown in FIGS. 4 and 5, so that the locking bolts 30 to 33 are coupled to the piston-cylinder unit 50 and can be moved into their unlocked position by retracting the piston 51 while compressing the compression spring 34.
- a reflection light barrier 56 is provided on the cylinder 18, which scans marks on the inner walls of the telescopic shots .
- FIG. 4 shows a section through two telescopic sections which are locked together in the extended state.
- the profile of the telescopic sections corresponds to the profile shapes described in EP 0 499 208 A2.
- the collar-shaped edge of the telescopic cylinder 18 is moved to the height of the corresponding end piece of the telescopic section and positioned there by the light barrier 56.
- the two side locking bolts 20, 21 are then extended. With built-in proximity limit switches in the side, the bolts 20, 21 extending cylinders ensures that both bolts are fully extended and locked with the holes in the telescopic section. Only after this locking is the piston-cylinder unit 50 activated so that the piston 51 can be retracted and the locking can be released with the next telescopic shot.
- the inner telescopic boom is now extended until it has reached the desired extension length.
- the piston 51 is extended so that the extended telescopic section is locked with the telescopic section encompassing it by engaging the locking bolt in the locking bore.
- Built-in limit switches in the piston-cylinder unit 50 ensure that the respective locking bolt is fully inserted into the locking bore. Only after this locking of the telescopic sections with one another is it possible to pull in the two lateral bolts 20, 21 via the associated cylinders.
- the telescopic cylinder 18 is then moved back to the end piece of the next telescopic shot and locked in the manner described. The next telescopic shot is extended accordingly.
- the retracting of the individual telescopic sections is carried out in reverse.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9422159U DE9422159U1 (de) | 1993-12-28 | 1994-10-17 | Fahrbarer Kran mit einem Teleskopausleger |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4344795 | 1993-12-28 | ||
DE4344795A DE4344795A1 (de) | 1993-12-28 | 1993-12-28 | Fahrbarer Kran mit einem Teleskopausleger |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0661234A1 true EP0661234A1 (fr) | 1995-07-05 |
EP0661234B1 EP0661234B1 (fr) | 1999-12-29 |
EP0661234B2 EP0661234B2 (fr) | 2004-03-03 |
Family
ID=6506438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94116337A Expired - Lifetime EP0661234B2 (fr) | 1993-12-28 | 1994-10-17 | Grue mobile avec un flèche télescopique |
Country Status (4)
Country | Link |
---|---|
US (1) | US5628416A (fr) |
EP (1) | EP0661234B2 (fr) |
JP (1) | JP3212467B2 (fr) |
DE (2) | DE4344795A1 (fr) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0754646A1 (fr) * | 1995-07-17 | 1997-01-22 | Montanhydraulik GmbH | Système de télescopage |
DE19653502A1 (de) * | 1996-12-20 | 1998-06-25 | Kidde Ind Inc | Vorrichtung und Verfahren zum Arretieren bzw. Lösen der Arretierung von Schüssen eines Teleskopauslegers für einen fahrbaren Kran |
WO1998054081A1 (fr) * | 1997-05-28 | 1998-12-03 | Mannesmann Ag | Grue a fleche telescopique |
EP0990617A1 (fr) * | 1995-07-17 | 2000-04-05 | Montanhydraulik GmbH | Système de télescopage |
EP1055635A2 (fr) * | 1999-04-29 | 2000-11-29 | MANNESMANN Aktiengesellschaft | Grue avec une flèche télescopique |
EP1072554A1 (fr) * | 1999-07-30 | 2001-01-31 | Liebherr-Werk Ehingen GmbH | Grue à flèche téléscopique |
US6206213B1 (en) | 1999-04-29 | 2001-03-27 | Mannesmann Ag | Crane with a luffing jib |
DE10056649C1 (de) * | 2000-11-09 | 2002-06-13 | Demag Mobile Cranes Gmbh & Co | Teleskopausleger mit Verriegelungselement |
DE19824671C2 (de) * | 1997-05-28 | 2002-09-19 | Mannesmann Ag | Kran mit einem Teleskopausleger |
DE19925188C2 (de) * | 1999-05-26 | 2003-03-13 | Demag Mobile Cranes Gmbh & Co | Verfahren zum synchronen Ein- und Austeleskopieren von Teleskopschüssen eines Kranauslegers |
DE10048224B4 (de) * | 2000-09-21 | 2005-06-02 | Terex-Demag Gmbh & Co. Kg | Verriegelungseinheit für einen Teleskopausleger eines Krans |
DE19811813B4 (de) * | 1998-03-18 | 2005-11-24 | Grove U.S. LLC (n.d.Ges.d.Staates Delaware) | Seitliche Auslegerverriegelung |
DE10004838B4 (de) * | 1999-02-10 | 2006-05-04 | Terex-Demag Gmbh & Co. Kg | Kran mit einem Teleskopausleger |
EP2221270A3 (fr) * | 2009-02-20 | 2012-03-21 | Terex Demag GmbH | Unité de sécurité et de boulonnage |
CN103407912A (zh) * | 2013-08-27 | 2013-11-27 | 徐州重型机械有限公司 | 一种单缸插销式伸缩臂、起重机及其伸缩方法 |
US10077173B2 (en) | 2013-08-27 | 2018-09-18 | Xuzhou Heavy Machinery Co., Ltd. | Single-cylinder plug pin type telescopic arm, telescopic method thereof and crane having telescopic arm |
CN111379759A (zh) * | 2018-12-28 | 2020-07-07 | 徐州徐工液压件有限公司 | 液压油缸组件和起重机 |
CN112777498A (zh) * | 2021-03-23 | 2021-05-11 | 三一汽车起重机械有限公司 | 一种伸缩臂结构及起重机 |
Families Citing this family (63)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19624312C2 (de) * | 1996-06-18 | 2000-05-31 | Grove Us Llc | Teleskopausleger für Fahrzeugkrane |
DE19631547B4 (de) * | 1996-07-24 | 2004-05-06 | Terex-Demag Gmbh & Co. Kg | Teleskopausleger, insbesondere für stationäre oder fahrbare Krane |
DE19641193C2 (de) * | 1996-09-24 | 2002-04-25 | Mannesmann Ag | Teleskopausleger, insbesondere für stationäre oder fahrbare Krane |
DE19641191A1 (de) * | 1996-09-24 | 1998-03-26 | Mannesmann Ag | Teleskopausleger, insbesondere für stationäre und fahrbare Krane |
DE19711975B4 (de) * | 1997-03-12 | 2006-09-07 | Terex-Demag Gmbh & Co. Kg | Teleskopausleger für Fahrzeugkrane |
KR100591423B1 (ko) | 1997-07-15 | 2006-06-21 | 가부시키가이샤 고마쓰 세이사쿠쇼 | 버킷식 굴삭기의 부움 및 그 제조방법 |
DE19826924A1 (de) * | 1998-06-17 | 1999-12-23 | Grove Us Llc | Auslegerfixierung mit Einstellzylinder |
DE19926131B4 (de) * | 1999-06-09 | 2007-04-19 | Faun Gmbh | Teleskop-Ausleger |
FR2797862B1 (fr) * | 1999-09-01 | 2001-11-16 | Ppm | Procede de telescopage d'une fleche de grue, dispositif pour sa mise en oeuvre et fleche de grue en faisant application |
JP2001278582A (ja) * | 2000-03-29 | 2001-10-10 | Tadano Ltd | 移動式クレーンのブーム伸縮機構 |
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DE10022373B4 (de) * | 2000-05-08 | 2005-11-24 | Grove U.S. Llc | Verriegelungs- und Betätigungseinheit für seitliche Auslegerverriegelung |
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US6601719B2 (en) | 2001-09-21 | 2003-08-05 | Link-Belt Construction Equipment Co., L.P., Lllp | Locking and latching system for a telescoping boom |
DE20120121U1 (de) | 2001-12-12 | 2002-03-07 | Grove U.S. LLC, Shady Grove, Pa. | Teleskopausleger für einen Fahrzeugkran |
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EP1387025B1 (fr) * | 2002-08-01 | 2007-04-11 | Liebherr-Werk Ehingen GmbH | Couverture pliable pour larges surfaces |
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US10604386B2 (en) * | 2016-03-03 | 2020-03-31 | Tadano Ltd. | Expansion/contraction mechanism |
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WO2018140881A1 (fr) | 2017-01-30 | 2018-08-02 | National Oilwell Varco, L.P. | Mât à déploiement télescopique |
CN108116995B (zh) * | 2017-09-30 | 2019-07-09 | 陈奕松 | 一种伸缩吊臂的锁定装置、伸缩吊臂、起重机及其伸缩锁定方法 |
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IT201800020221A1 (it) * | 2018-12-19 | 2020-06-19 | Cifa Spa | Braccio telescopico per gru e gru comprendente tale braccio |
EP3757054B1 (fr) | 2019-06-24 | 2023-08-02 | Manitowoc Crane Companies, LLC | Ensemble d'actionnement électrique d'une flèche fixée sur une grue |
DE102020129762B3 (de) * | 2020-11-11 | 2022-02-17 | Tadano Demag Gmbh | Teleskopausleger eines Mobilkrans |
CN113896121A (zh) * | 2021-10-08 | 2022-01-07 | 徐州重型机械有限公司 | 起重机插销式伸缩系统和起重机 |
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DE9113981U1 (de) † | 1991-11-11 | 1992-04-02 | Liebherr-Werk Ehingen Gmbh, 7930 Ehingen | Teleskopausleger für Fahrzeugkrane o.dgl. |
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- 1994-12-28 JP JP32682094A patent/JP3212467B2/ja not_active Expired - Lifetime
- 1994-12-28 US US08/365,469 patent/US5628416A/en not_active Expired - Lifetime
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Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0990617A1 (fr) * | 1995-07-17 | 2000-04-05 | Montanhydraulik GmbH | Système de télescopage |
EP0754646A1 (fr) * | 1995-07-17 | 1997-01-22 | Montanhydraulik GmbH | Système de télescopage |
DE19653502A1 (de) * | 1996-12-20 | 1998-06-25 | Kidde Ind Inc | Vorrichtung und Verfahren zum Arretieren bzw. Lösen der Arretierung von Schüssen eines Teleskopauslegers für einen fahrbaren Kran |
US6062404A (en) * | 1996-12-20 | 2000-05-16 | Grove U.S. L.L.C. | Device and method for arresting sections of a telescopic jib |
DE19653502C2 (de) * | 1996-12-20 | 2000-06-21 | Grove Us Llc | Vorrichtung zum Arretieren bzw. Lösen der Arretierung von Schüssen eines Teleskopauslegers für einen fahrbaren Kran |
DE19824671C2 (de) * | 1997-05-28 | 2002-09-19 | Mannesmann Ag | Kran mit einem Teleskopausleger |
WO1998054081A1 (fr) * | 1997-05-28 | 1998-12-03 | Mannesmann Ag | Grue a fleche telescopique |
DE19811813B4 (de) * | 1998-03-18 | 2005-11-24 | Grove U.S. LLC (n.d.Ges.d.Staates Delaware) | Seitliche Auslegerverriegelung |
DE10004838B4 (de) * | 1999-02-10 | 2006-05-04 | Terex-Demag Gmbh & Co. Kg | Kran mit einem Teleskopausleger |
EP1055635A2 (fr) * | 1999-04-29 | 2000-11-29 | MANNESMANN Aktiengesellschaft | Grue avec une flèche télescopique |
EP1055635A3 (fr) * | 1999-04-29 | 2003-09-17 | MANNESMANN Aktiengesellschaft | Grue avec une flèche télescopique |
US6206213B1 (en) | 1999-04-29 | 2001-03-27 | Mannesmann Ag | Crane with a luffing jib |
DE10007773B4 (de) * | 1999-04-29 | 2005-07-21 | Terex-Demag Gmbh & Co. Kg | Kran mit einem Teleskopausleger |
DE19925188C2 (de) * | 1999-05-26 | 2003-03-13 | Demag Mobile Cranes Gmbh & Co | Verfahren zum synchronen Ein- und Austeleskopieren von Teleskopschüssen eines Kranauslegers |
US6527131B1 (en) | 1999-07-30 | 2003-03-04 | Liebherr-Werk Ehingen Gmbh | Crane with a telescopic boom |
JP2001080883A (ja) * | 1999-07-30 | 2001-03-27 | Liebherr Werk Ehingen Gmbh | クレーン |
EP1072554A1 (fr) * | 1999-07-30 | 2001-01-31 | Liebherr-Werk Ehingen GmbH | Grue à flèche téléscopique |
DE10048224B4 (de) * | 2000-09-21 | 2005-06-02 | Terex-Demag Gmbh & Co. Kg | Verriegelungseinheit für einen Teleskopausleger eines Krans |
DE10056649C1 (de) * | 2000-11-09 | 2002-06-13 | Demag Mobile Cranes Gmbh & Co | Teleskopausleger mit Verriegelungselement |
EP2221270A3 (fr) * | 2009-02-20 | 2012-03-21 | Terex Demag GmbH | Unité de sécurité et de boulonnage |
CN103407912A (zh) * | 2013-08-27 | 2013-11-27 | 徐州重型机械有限公司 | 一种单缸插销式伸缩臂、起重机及其伸缩方法 |
CN103407912B (zh) * | 2013-08-27 | 2015-06-17 | 徐州重型机械有限公司 | 一种单缸插销式伸缩臂、起重机及其伸缩方法 |
US10077173B2 (en) | 2013-08-27 | 2018-09-18 | Xuzhou Heavy Machinery Co., Ltd. | Single-cylinder plug pin type telescopic arm, telescopic method thereof and crane having telescopic arm |
CN111379759A (zh) * | 2018-12-28 | 2020-07-07 | 徐州徐工液压件有限公司 | 液压油缸组件和起重机 |
CN112777498A (zh) * | 2021-03-23 | 2021-05-11 | 三一汽车起重机械有限公司 | 一种伸缩臂结构及起重机 |
Also Published As
Publication number | Publication date |
---|---|
JP3212467B2 (ja) | 2001-09-25 |
JPH07267584A (ja) | 1995-10-17 |
DE4344795A1 (de) | 1995-06-29 |
EP0661234B2 (fr) | 2004-03-03 |
EP0661234B1 (fr) | 1999-12-29 |
DE59409037D1 (de) | 2000-02-03 |
US5628416A (en) | 1997-05-13 |
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