EP2096075A1 - Poutre télescopique - Google Patents

Poutre télescopique Download PDF

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Publication number
EP2096075A1
EP2096075A1 EP08152042A EP08152042A EP2096075A1 EP 2096075 A1 EP2096075 A1 EP 2096075A1 EP 08152042 A EP08152042 A EP 08152042A EP 08152042 A EP08152042 A EP 08152042A EP 2096075 A1 EP2096075 A1 EP 2096075A1
Authority
EP
European Patent Office
Prior art keywords
boom
boom section
relation
pulley
section
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.)
Withdrawn
Application number
EP08152042A
Other languages
German (de)
English (en)
Inventor
Cor Tolboom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cargotec Patenter AB
Original Assignee
Cargotec Patenter AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cargotec Patenter AB filed Critical Cargotec Patenter AB
Priority to EP08152042A priority Critical patent/EP2096075A1/fr
Publication of EP2096075A1 publication Critical patent/EP2096075A1/fr
Withdrawn legal-status Critical Current

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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
    • B66C23/703—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by flexible elements, e.g. cables, chains or bands
    • 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 present invention relates to a telescopic boom according to the preamble of claim 1.
  • Telescopically extendable and retractable booms are frequently used for instance on different types of cranes and are known in various configurations.
  • every displaceable boom section may be provided with its own hydraulic cylinder in order to control the extension and retraction of the boom section.
  • a hydraulic cylinder for displacing a first displaceable boom section in relation to a fixed support or fixed boom section and a flexible transmission member, e.g. in the form of a belt or chain, for displacing a second displaceable boom section in relation to the first displaceable boom section, as disclosed in US 4 193 505 A and FR 2 708 584 A1 .
  • the object of the present invention is to provide a telescopic boom of new and advantageous design.
  • the telescopic boom of the present invention comprises:
  • the transmission members and the pulleys will force the third boom section to move axially in relation to the second boom section when the second boom section is moved axially in relation to the first boom section and will thereby cause a synchronization of the axial movements of the individual boom sections when the boom is extended and retracted.
  • the transmission members extend only inside the boom sections and do no pass through any area between two adjacent boom sections.
  • the transmission members and their pulleys are all located inside the boom sections and are thereby well protected against weather influences and dirt and protected against collisions with outside elements.
  • a further advantage with this internal location of the transmission members and their pulleys is that no parts other than sliding elements need to be located in the areas between the boom sections.
  • the dimensions of the sliding elements can be optimized to reduce normal stress on the boom sections.
  • the first pulley and the second pulley are mounted to an elongated support unit, which is fixed to the second boom section at the inner end thereof and extends axially inside the second and third boom sections, the first pulley being mounted at the outer end of the support unit and the second pulley being mounted at the inner end of the support unit.
  • the pulleys can be mounted inside the boom sections in a simple manner.
  • the actuating member comprises:
  • the boom comprises at least one flexible conduit in the form of a hose or cable, which is arranged inside the boom sections and has a first point fixed in relation to the first boom section and a second point fixed in relation to the third boom section, said conduit extending inside the boom sections between its first and second points over a pulley, which is fixed in axial position in relation to the second boom section and arranged to act on the conduit so as to keep the conduit stretched out and prevent it from slackening when the boom sections are axially displaced in relation to each other.
  • Telescopic booms 1, 1' according to two different embodiments of the present invention are illustrated in Figs 1-4 .
  • the respective boom 1, 1' comprises three boom sections 2, 3, 4.
  • a first boom section 2 constitutes an innermost base section of the boom.
  • a second boom section 3 constitutes an intermediate section of the boom and is mounted to the first boom section 2 so as to be axially displaceable in relation thereto.
  • a third boom section 4 constitutes an outermost section of the boom and is mounted to the second boom section 3 so as to be axially displaceable in relation thereto.
  • the boom sections 2, 3, 4 are tubular and together they delimit an inner space 5 of the boom.
  • the third boom section 4 is slidingly received in the second boom section 3, which in its turn is slidingly received in the first boom section 2.
  • the boom 1, 1' is telescopically extendable by displacement of the second and third boom sections 3, 4 outwards in relation to the first boom section 2 and telescopically retractable by displacement of the second and third boom sections 3, 4 inwards in relation to the first boom section 2.
  • the boom sections 2, 3, 4 are in a conventional manner provided with sliding elements 8 so as to allow the third boom section 4 to be slidingly supported against the second boom section 3 and the second boom section 3 to be slidingly supported against the first boom section 2, as illustrated in Figs 1-4 .
  • the boom 1, 1' comprises an actuating member 6 acting on the second boom section 3 for displacing the second boom section 3 axially in relation to the first boom section 2.
  • the actuating member 6 is with advantage a hydraulic cylinder comprising a cylinder part 6a, a piston (not shown) mounted inside the cylinder part 6a so as to be axially displaceable in relation to the cylinder part, and a piston rod 6b secured to the piston.
  • any other suitable type of actuating member capable of displacing the second boom section 3 axially in relation to the first boom section 2 could be used.
  • the actuating member 6 is a hydraulic cylinder with the cylinder part 6a fixed in axial position in relation to the first boom section 2 and with the piston rod 6b fixed in axial position in relation to the second boom section 3.
  • the piston rod 6b could alternatively by fixed in axial position in relation to the first boom section 2 and the cylinder part 6a fixed in axial position in relation to the second boom section 3, if so desired.
  • the actuating member 6 is mounted on the outside of the first and second boom sections 2, 3, but it could alternatively be mounted inside the boom sections in the above-mentioned inner space 5.
  • the actuating member 6 is a hydraulic cylinder mounted in the inner space 5 of the boom sections with the cylinder part 6a fixed in axial position in relation to the second boom section 3 and with the piston rod 6b fixed in axial position in relation to the first boom section 2.
  • the boom 1, 1' comprises an elongated, flexible first transmission member 10 in the form of a belt or cable or chain or the like, which is arranged in the inner space 5 of the boom sections.
  • This transmission member 10 has a first point 11 fixed in relation to the first boom section 2 and a second point 12 fixed in relation to the third boom section 3.
  • the transmission member 10 extends inside the boom sections between said first and second points 11, 12 over a pulley 13, in the following denominated first pulley, which is fixed in axial position in relation to the second boom section 3.
  • the first pulley 13 is arranged to act on the first transmission member 10 so as to displace said second point 12 of the first transmission member and thereby the third boom section 4 axially outwards in relation to the second boom section 3 when the second boom section is displaced axially outwards in relation to the first boom section 2 under the effect of the actuating member 6.
  • the first pulley 13 will be moved together with the second boom section away from said first point 11 so that said second point 12 is forced to move outwards, thereby driving also the third boom section 4 outwards.
  • the first pulley 13 is located closer to the outer end of the boom as compared to said first and second points 11, 12 of the first transmission member 10.
  • the first transmission member 10 extends forwards from the first point 11 in the direction towards the outer end of the boom, around the first pulley 13 and then backwards from the first pulley 13 to the second point 12 in the direction towards the inner end of the boom.
  • the boom 1, 1' also comprises an elongated, flexible second transmission member 20 in the form of a belt or cable or chain or the like, which is arranged in the inner space 5 of the boom sections.
  • This transmission member 20 has a first point 21 fixed in relation to the first boom section 2 and a second point 22 fixed in relation to the third boom section 4.
  • the transmission member 20 extends inside the boom sections between said first and second points 21, 22 over a pulley 23, in the following denominated second pulley, which is fixed in axial position in relation to the second boom section 3.
  • the second pulley 23 is arranged to act on the second transmission member 20 so as to displace said second point 22 of the second transmission member and thereby the third boom section 4 axially inwards in relation to the second boom section 3 when the second boom section is displaced axially inwards in relation to the first boom section 2 under the effect of the actuating member 6.
  • the second pulley 23 will be moved together with the second boom section away from said first point 21 so that said second point 22 is forced to move inwards, thereby driving also the third boom section 4 inwards.
  • the second pulley 23 is located closer to the inner end of the boom as compared to said first and second points 21, 22 of the second transmission member 20.
  • the second transmission member 20 extends backwards from the first point 21 in the direction towards the inner end of the boom, around the second pulley 23 and then forwards from the second pulley 23 to the second point 22 in the direction towards the outer end of the boom.
  • the first pulley 13 is suitably located close to the outer end of the second boom section 3 and the second pulley 23 close to the inner end of the second boom section.
  • first and second transmission members 10, 20 are designed as separate parts.
  • first and second transmission members could alternatively constitute different sections of one and the same belt or cable or chain or the like.
  • the boom 1, 1' comprises a rigid elongated element 50, for instance in the form of a rod, which extends axially in the inner space 5 of the boom sections and is fixed in axial position in relation to the first boom section 2.
  • the elongated element 50 is secured to the first boom section 2 at the inner end thereof.
  • the above-mentioned first point 21 of the second transmission member 20 is fixed to the elongated element 50 at the outer end thereof.
  • the above-mentioned first point 11 of the first transmission member 10 is fixed to the elongated element 50 at the outer end thereof.
  • the first point 11 of the first transmission member 10 may however alternatively be fixed directly to the first boom section 2 at the inner end thereof, as illustrated in Figs 3 and 4 . In the latter case, the first point 11 of the first transmission member 10 is easily accessible at the inner end of the boom 1', which makes it easy to adjust the tension of the first transmission member 10 and thereby facilitates the installation and maintenance of the inner drive system of the boom.
  • the first and second pulleys 13, 23 are with advantage rotatably mounted to an elongated support unit 40, 40', which is fixed to the rear part of the second boom section 3, i.e. at the inner end thereof, and which extends axially in the inner space 5 of the boom sections.
  • the first pulley 13 is mounted at the outer end of the support unit 40, 40' and the second pulley 23 is mounted at the inner end thereof.
  • the support unit 40, 40' is suitably provided with one or several sliding elements 41 at its outer end, each sliding element 41 abutting against an inner sliding surface of the third boom section 4 so as support the outer end of the support unit slidingly against the third boom section 4.
  • the support unit 40 is secured to the second boom section 3 by means of an attachment 9 and it is arranged to move along the elongated element 50 when the second boom section 3 is displaced axially in relation to the first boom section 2.
  • the elongated element 50 may be supported by the support unit 40 via a first bracket 42 arranged at the inner end of the support unit and rest against this bracket 42 via a sliding element 43 arranged on the bracket 42, as illustrated in Figs 1 and 2 .
  • the sliding element 41 provided at the outer end of the support unit 40 is mounted to a second bracket 44, which is arranged at the outer end of the support unit 40.
  • the elongated element 50 extends through a cavity in the first bracket 42 and will also extend through a cavity in the second bracket 44 when the boom is in the retracted position.
  • the above-mentioned first points 11, 21 of the first and second transmission members 10, 20 are fixed to a holder 51 secured to the elongated element 50 at the outer end thereof.
  • the holder 51 may abut against the support unit 40 via sliding elements 52 arranged on the holder 51.
  • the above-mentioned second points 12, 22 of the first and second transmission members 10, 20 are fixed to another holder 53 secured to the third boom section 4 at the inner end thereof.
  • the holder 53 may abut against the support unit 40 via sliding elements 54 arranged on the holder 53.
  • the boom 1' comprises an elongated, flexible third transmission member 30 (see Figs 7 and 12 ) in the form of a belt or cable or chain or the like, which is arranged in the inner space 5 of the boom sections in parallel to the second transmission member 20.
  • This third transmission member 30 has a first point (not shown) fixed in relation to the first boom section 2 and a second point 32 fixed in relation to the third boom section 3.
  • the transmission member 30 extends inside the boom sections between its first and second points over a pulley 33, in the following denominated third pulley, which is fixed in axial position in relation to the second boom section 3.
  • the third pulley 33 is arranged to act on the third transmission member 30 so as to displace said second point 32 of the third transmission member and thereby the third boom section 4 axially inwards in relation to the second boom section 3 when the second boom section is displaced axially inwards in relation to the first boom section 2 under the effect of the actuating member 6.
  • the second pulley 23 and the third pulley 33 are mutually concentric and rotatably mounted to the support unit 40' on opposite sides thereof symmetrically in relation to the centre axis of the support unit, as illustrated in Fig 12 .
  • the first pulley 13 is mounted in a plane which extends through the centre axis of the support unit and forms the plane of symmetry for the second and third pulleys 23, 33.
  • Said first point of the third transmission member 30 is fixed to the elongated element 50 at the outer end thereof at the same axial position along the elongated element as the first point 21 of the second transmission member 20.
  • the support unit 40' comprises a body part formed by the cylinder part 6a of the actuating member.
  • the second and third pulleys 23, 33 are rotatably mounted to this cylinder part 6a on opposite sides thereof, as illustrated in Figs 7-9 and 12 .
  • the cylinder part 6a is provided with two projections 45, which extend from the cylinder part on opposite sides thereof. These projections 45 are received in seats 7 provided on the inner wall of the second boom section 3, as illustrated in Fig 12 , so as to thereby secure the cylinder part 6a to the second boom section 3.
  • the support unit 40' further comprises a bracket 46 secured to the outer end of the cylinder part 6a, the first pulley 13 being rotatably mounted to this bracket 46.
  • Sliding elements 41 are mounted on the outside of a frame 47 secured to the bracket 46 so as to allow the bracket to be slidingly supported in relation to the inner wall of the third boom section 4.
  • the boom may comprise one or several flexible conduits 60 in the form of hoses or cables arranged in the inner space 5 of the boom sections.
  • a conduit 60 could for instance be a hose for supplying compressed air or hydraulic fluid to a tool carried by the boom at the outer end thereof and for return of hydraulic fluid from such a tool.
  • Such a conduit 60 could also be an electric or optical cable.
  • the respective conduit 60 has a first point 61 fixed in relation to the first boom section 2 and a second point 62 fixed in relation to the third boom section 4.
  • the conduit 60 extends inside the boom sections between said first and second points 61, 62 over a pulley 63 which is fixed in axial position in relation to the second boom section 3.
  • the pulley 63 is arranged to act on the conduit 60 so as to keep the conduit stretched out and prevent it from slackening when the boom sections are axially displaced in relation to each.
  • the pulley 63 is located closer to the outer end of the boom as compared to said first and second points 61, 62 of the conduit 60.
  • the conduit 60 extends forwards from the first point 61 in the direction towards the outer end of the boom, around its pulley 63 and then backwards from the pulley 63 to the second point 62 in the direction towards the inner end of the boom.
  • the pulley 63 is mounted to the bracket 46 at the outer end of the support unit 40' and is suitably concentric with the first pulley 13, as illustrated in Figs 7 and 12 .
  • the boom comprises two pulleys 63 for conduits arranged on opposite sides of the first pulley 13.
  • the respective conduit 60 may be connected to a rigid pipe 64, which is mounted to the third boom section 4 so as to extend from the second point 62 of the conduit to the outer end of the third boom section.
  • Fig 7 shows such a preassembled assembly 70 comprising:
  • the preassembled assembly 70 may also be provided with one or several flexible conduits 60, as illustrated in Fig 8 .
  • each conduit 60 is secured at one end to a holder 74 mounted to the above-mentioned slide member 73 and at the other end to the base 71.
  • Each conduit 60 extends over a pulley 63 rotatably mounted to the bracket 46 and is connected to a pipe 64, which is secured at one end to the holder 74 and at the other end is to be secured to the outer end of the third boom section 4.
  • the assembly 70 is mounted to an outer boom section 4 by being inserted with the frame 47 first into the inner cavity of the boom section via the open inner end of the boom section 4, as illustrated in Fig 9 .
  • the slide member 73 is then secured to this boom section 4.
  • the assembly 70 and the outer boom section 4 are together mounted to an intermediate boom section 3 by being inserted with the base 71 first into the inner cavity of the intermediate boom section 3 via the open outer end of the boom section 3, as illustrated in Fig 10 .
  • the cylinder part 6a is then secured to the intermediate boom section 3 via the mounting projections 45.
  • this boom 1' can be assembled and disassembled in a very simple and convenient manner, which will facilitate the installation of the drive system of the boom and the maintenance of the boom and its drive system.
  • the telescopic boom according to the present invention may constitute a crane boom, in which case the first boom section 2 could be pivotally mounted to a part of a crane, for instance a vehicle crane, so as to be pivotable about a horizontal axis in relation to that crane part.
  • the third boom section 4 may be designed to carry a load in a load suspension point located at its outer end.
  • the telescopic boom according to the invention may alternatively constitute an extension boom for positioning a support leg in the horizontal direction in relation to the chassis of a trailer or a vehicle in the form of a lorry or the similar.
  • the first boom section 2 is mounted to the chassis of the trailer/vehicle and a vertically extendable support leg is secured to the outer end of the third boom section 4.
  • the boom may for instance comprise more than three boom sections if so desired.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
EP08152042A 2008-02-28 2008-02-28 Poutre télescopique Withdrawn EP2096075A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08152042A EP2096075A1 (fr) 2008-02-28 2008-02-28 Poutre télescopique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08152042A EP2096075A1 (fr) 2008-02-28 2008-02-28 Poutre télescopique

Publications (1)

Publication Number Publication Date
EP2096075A1 true EP2096075A1 (fr) 2009-09-02

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ID=39709295

Family Applications (1)

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EP08152042A Withdrawn EP2096075A1 (fr) 2008-02-28 2008-02-28 Poutre télescopique

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EP (1) EP2096075A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCO20100061A1 (it) * 2010-11-12 2012-05-13 Giulio Manzoni Moltiplicatore di moto a risparmio di energia applicata per sistemi lineari ad almeno tre stadi.
CN104008254A (zh) * 2014-06-12 2014-08-27 河海大学常州校区 一种伸缩吊臂静态模型的集成优化方法
WO2024016040A1 (fr) * 2022-07-20 2024-01-25 Palfinger Ag Flèche télescopique pour un engin de travail, en particulier une grue ou une grue mobile

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193505A (en) 1977-03-21 1980-03-18 Jonsereds Ab Arrangement in a hydraulically operated crane
DE2854034A1 (de) * 1978-12-14 1980-07-03 Porsche Ag Hubvorrichtung, insbesondere fuer brandbekaempfungs- und/oder rettungsfahrzeuge
US4258853A (en) * 1978-04-24 1981-03-31 Caterpillar Tractor Co. Extensible boom for cranes
US5060427A (en) * 1990-02-01 1991-10-29 Kidde Industries, Inc. Extension and retraction system for four section telescopic boom having simultaneous and equal extension and retraction of the telescopic sections
FR2708584A1 (fr) 1993-08-06 1995-02-10 Ppm Dispositif de commande sélective du déplacement simultané ou télescopique synchronisé de deux éléments constitutifs d'une flèche télescopique de grue.
JPH1111891A (ja) * 1997-06-26 1999-01-19 Aichi Corp ブームの伸縮構造
JPH11335079A (ja) * 1998-05-28 1999-12-07 Aichi Corp 伸縮ブーム
JP2001130871A (ja) * 1999-10-29 2001-05-15 Aichi Corp 伸縮ブーム
JP2002128470A (ja) * 2000-10-27 2002-05-09 Furukawa Co Ltd ブーム伸縮装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193505A (en) 1977-03-21 1980-03-18 Jonsereds Ab Arrangement in a hydraulically operated crane
US4258853A (en) * 1978-04-24 1981-03-31 Caterpillar Tractor Co. Extensible boom for cranes
DE2854034A1 (de) * 1978-12-14 1980-07-03 Porsche Ag Hubvorrichtung, insbesondere fuer brandbekaempfungs- und/oder rettungsfahrzeuge
US5060427A (en) * 1990-02-01 1991-10-29 Kidde Industries, Inc. Extension and retraction system for four section telescopic boom having simultaneous and equal extension and retraction of the telescopic sections
FR2708584A1 (fr) 1993-08-06 1995-02-10 Ppm Dispositif de commande sélective du déplacement simultané ou télescopique synchronisé de deux éléments constitutifs d'une flèche télescopique de grue.
JPH1111891A (ja) * 1997-06-26 1999-01-19 Aichi Corp ブームの伸縮構造
JPH11335079A (ja) * 1998-05-28 1999-12-07 Aichi Corp 伸縮ブーム
JP2001130871A (ja) * 1999-10-29 2001-05-15 Aichi Corp 伸縮ブーム
JP2002128470A (ja) * 2000-10-27 2002-05-09 Furukawa Co Ltd ブーム伸縮装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCO20100061A1 (it) * 2010-11-12 2012-05-13 Giulio Manzoni Moltiplicatore di moto a risparmio di energia applicata per sistemi lineari ad almeno tre stadi.
CN104008254A (zh) * 2014-06-12 2014-08-27 河海大学常州校区 一种伸缩吊臂静态模型的集成优化方法
CN104008254B (zh) * 2014-06-12 2017-01-11 河海大学常州校区 一种伸缩吊臂静态模型的集成优化方法
WO2024016040A1 (fr) * 2022-07-20 2024-01-25 Palfinger Ag Flèche télescopique pour un engin de travail, en particulier une grue ou une grue mobile

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