EP2542495B1 - A crane for lifting a load - Google Patents

A crane for lifting a load Download PDF

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Publication number
EP2542495B1
EP2542495B1 EP11716649.6A EP11716649A EP2542495B1 EP 2542495 B1 EP2542495 B1 EP 2542495B1 EP 11716649 A EP11716649 A EP 11716649A EP 2542495 B1 EP2542495 B1 EP 2542495B1
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EP
European Patent Office
Prior art keywords
members
actuator
locking
arm
extensible arm
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.)
Revoked
Application number
EP11716649.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2542495A2 (en
Inventor
Luca Perelli
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.)
Hiab AB
Original Assignee
Effer SpA
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.)
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Publication of EP2542495A2 publication Critical patent/EP2542495A2/en
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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
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • 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
    • B66C23/707—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic guiding 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
    • B66C23/708—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic locking devices for telescopic jibs

Definitions

  • This invention relates to a crane for lifting a load.
  • the crane of the invention is a mobile crane, that is to say, a crane which can be mounted on a vehicle, in particular on a motor vehicle or truck.
  • Cranes for mounting on trucks which comprise a base structure, a pivoting arm for pivotal mounting to the base structure and a telescopically extensible arm having a respective base section or member which is articulated to the pivoting arm and from the inside of which extend respective sliding members or sections.
  • each sliding member corresponds to a respective motor means or actuator which drives the sliding member between a retracted position and an extended position relative to the member preceding it or coaxially on the outside of it.
  • actuators are housed outside the arm sliding members, preferably above them. Otherwise, a single, complex actuator is used which has a plurality of stages for respective sliding members and which is thus excessively complicated to make and drive.
  • EP1321426 discloses a crane for lifting a load comprising an extensible arm having a base member and a plurality of sliding members and first and second actuators for driving the extension and retraction of the sliding members of the extensible arm that are fixed on the base more heavy member of the same arm.
  • a crane according to the preamble of claim 1 is known from JPH11301976A.
  • This invention proposes a novel solution, alternative to the solutions known up to now, and, more specifically, aims to overcome one or more of the above mentioned drawbacks or problems, and/or to meet one or more of the needs mentioned or inferable from the above.
  • a crane for lifting a load comprising an extensible arm that can be lifted and lowered; the extensible arm comprising a base member and a plurality of sliding members terminating with an end sliding member; the sliding members of the extensible arm being coaxially inserted one inside the other and being telescopically movable relative to each other between a respective retracted position and a respective extended position under the action of corresponding telescopic drive means, wherein the telescopic drive means comprise a first and a second actuator.
  • the telescopic drive means are mounted on the end sliding member.
  • the telescopic arm can be slid out or extended relatively easily even when the crane is lifting a heavy load.
  • the sliding members can be extended, or made to slide out starting from the ones with the largest, and hence more resistant, sections, that is to say, the ones closest to the base followed by the adjacent ones progressively further away from the base.
  • each actuator has a movable end which is equipped with means for engaging and disengaging respective members of the extensible arm.
  • FIGS 1A to 1D illustrate preferred embodiment 3 of a part of a crane for lifting a load, the crane being, more specifically, in the form of a mobile crane, especially a crane applicable to a vehicle, in particular a motor vehicle or truck. It will be understood, however, that the crane of this application might also be used in a fixed installation, that is to say, it might be in the form of a fixed crane.
  • the crane comprises a base structure, or base, more specifically composed of a base for mounting to the vehicle and from which there extends upwardly a respective upright, or a pivoting arm, articulated at a respective end to the upright and able to be lifted or lowered relative to the latter under the driving action of a corresponding actuator or hydraulic cylinder
  • the crane also comprises a telescopically extensible arm 3, illustrated in Figure 1A , which extends from the pivoting arm for pivotal mounting to the base structure, the extensible arm being in turn articulated at a respective upstream end of it to the pivoting arm and being able to be lifted and lowered relative to the pivoting arm under the driving action of a corresponding actuator or hydraulic cylinder.
  • the telescopically extensible arm 3 comprises a plurality of tubular members or sections, comprising, more specifically, a base tubular member or section 31 connected directly and in articulated manner to the pivoting arm of the crane, and a plurality of tubular sliding members or sections which are located coaxially inside the base member 31 and inside each other.
  • the extensible arm also comprises a series of intermediate tubular sliding members, labelled 33, 34, 35, 36, 37, 38, 39, and an end sliding member labelled 40.
  • the members 31, 33, 34, 35, 36, 37, 38, 39, 40 of the extensible arm are in the form of tubular sections, and more specifically polygonal sections, which are progressively smaller in size from the base connecting member 31 to the end member 40, so that each member is housed inside the other members and, in particular, inside the member adjacently outside it, and able to slide longitudinally relative to it, in particular by engaging its outer surface with the inside surface of the member adjacently outside it.
  • the members of the extensible arm are coaxially inserted one inside the other and are telescopically movable relative to each other between a respective retracted position and a respective extended position, as will become clearer as this description continues.
  • the movable members of the extensible arm 3 are coaxially guided to move relative to the base member and relative to each other and can be optionally extended or retracted one after the other, or in succession.
  • the members of the extensible arm are extended and retracted by the action of corresponding telescopic drive means 4 which operate in such a way as to move the sliding members 33, 34, 35, 36, 37, 38, 39, 40 from the respective retracted position to the respective extended position and vice versa.
  • the tubular members of the extensible arm 3 have a respective upstream end 31a, 33a, 34a, 35a, 36a, 37a, 38a, 39a, which protrudes relative to the end or edge of the tubular member 33, 34, 35, 36, 37, 38, 39, 40 adjacently inside it.
  • the extensible arm has telescopic drive means 4, which are provided, or located, inside the respective members 31, 33, 34, 35, 36, 37, 38, 39, 40 of the extensible arm 3.
  • this extensible arm which houses the drive means 4 inside the section of the arm members, it is possible to make tubular members with a resistant section that is taller and hence particularly reduced in thickness.
  • the telescopic drive means 4 of the extensible arm 3 comprise only a first actuator 41 and a second actuator 42, which are both housed inside the tubular members of the extensible arm 3 and which are reciprocatingly driven to extend respective and successive members of the extensible arm or to retract respective and successive members of the extensible arm, as will become clearer as this description continues.
  • first and second actuators 41, 42 are driven simultaneously, respectively, to move a respective sliding member and to engage, or hook onto, a further sliding member, after releasing a corresponding sliding member, to go towards the position for engaging or hooking onto a further sliding member to be moved after it.
  • first and second actuators 41, 42 can advantageously be driven simultaneously in opposite directions for moving a respective sliding member and to perform a backward return movement to hook onto a further sliding member.
  • first and second actuators 41, 42 can advantageously be driven in such a way that one moves a respective sliding member and the other returns to the respective retracted position for catching a further sliding member during extension of the arm, or protrudes to the extended position for catching or hooking onto a sliding member to be retracted next during retraction of the telescopic arm.
  • the telescopic drive actuators 41, 42 have a respective rod 41a, 42a which is extensible and retractable relative to a respective cylinder 41b, 42b, forming a respective drive chamber 41c, 42c for the respective rod 41a, 42a.
  • the telescopic drive actuators 41, 42 extend and are driven to move along a direction longitudinal to the tubular members or to the extensible arm 3.
  • the telescopic drive means 4 are mounted on the end sliding member 40.
  • the telescopic drive means 4 are fixed to, or integral with, the end sliding member 40.
  • the telescopic arm can be extended and retracted relatively easily even when the crane is lifting a load.
  • the sliding members can be extended, or made to slide out, by first extending the ones with the largest, and hence more resistant, sections, that is to say, starting from the one closest to the base followed by the adjacent ones progressively further away from the base.
  • the telescopic arm can be retracted relatively easily even when the crane is lifting a load.
  • the sliding members can be retracted, by first withdrawing the ones with the smallest, and hence less resistant, sections, that is to say, starting the one furthest from the pivoting arm followed by the adjacent ones progressively closer to the base.
  • the structural strength of the crane and of the drive means is not placed at risk.
  • the drive means are closer to the suspended load and are thus subjected to relatively low stresses and can thus be configured with smaller dimensions.
  • each actuator 41, 42 has a respective end 41', 42', which is connected to, and in this particular embodiment, is integral with, the end sliding member 40 of the extensible arm 3, at the downstream end of the latter.
  • Each actuator 41, 42 also has a respective rod 41a, 42a which extends rearwards, that is, towards the upstream end 3' of the extensible arm.
  • each actuator 41, 42 also has another end 41", 42" which is provided with means 51, 52 for connecting to, or hooking onto, a respective member 31, 33, 34, 35, 36, 37, 38, 39 of the extensible arm 3 in order to extend or retract it relative to the adjacent tubular member, as will become clearer as this description continues.
  • each actuator 41, 42 also has another end 41", 42" which is provided with means 51, 52 for engaging and disengaging, a respective member 31, 33, 34, 35, 36, 37, 38, 39 of the extensible arm 3 in order to extend or retract or move it relative to the adjacent tubular member.
  • These means 51, 52 for engagement and disengagement at the movable end 41", 42" of the telescopic drive actuators 41, 42 comprise respective and opposite connecting pins, labelled 51a, 51b e 52a, 52b, which can be inserted into matching openings 53, 54 provided in the sidewalls of the respective tubular members of the extensible arm 3.
  • the engagement and disengagement means also comprise respective engagement pin means 51a, 51b e 52a, 52b which can be inserted into matching hole means made in the corresponding members of the extensible arm 3.
  • the engagement pin means which are, more specifically, in the form of two opposite pins 51a, 51b, 52a, 52b movable transversally between a plurality of positions of engaging and connecting respective tubular members of the extensible arm and a plurality of positions of disengaging the same tubular members.
  • the respective engagement pin means 51a, 51b or 52a, 52b are movable transversally between an extended position where it engages and connects the respective tubular member of the extensible arm and a retracted position where it disengages the same tubular member.
  • the engagement pin means 51a, 51b or 52a, 52b are driven by a corresponding hydraulic cylinder 51e, 52e, which is provided at the movable or free end of the respective telescopic drive actuator 41, 42.
  • the engagement and disengagement actuators 51e, 52e which drive the pins 51a, 51b, 52a, 52b extend transversally to the longitudinal direction of the arm with respective and transversally opposite rods, labelled 51c, 51d, 52c, 52d in Figure 1D .
  • engagement and disengagement means comprise engagement means 51, 52 which act in conjunction with respective engagement surfaces 53, 54 of respective members 31, 33, 34, 35, 36, 37, 38, 39 of the extensible arm 3.
  • the hole means or openings 53, 54 are, as illustrated, in the form of corresponding annularly profiled openings made in respective, opposite sidewalls of the members 31, 33, 34, 35, 36, 37, 38, 39 of the arm 3.
  • 61, 62, 63, 64, 65, 66, 67, 68 for mutually locking adjacent members, 31, 33, 34, 35, 36, 37, 38, 39, 40 both in the mutually extended and retracted positions.
  • the mutual locking means 61, 62, 63, 64, 65, 66, 67, 68 act in conjunction with matching annular openings or sockets, 60a, 60b provided in the top wall respectively at the upstream and downstream ends of each adjacently outside tubular member 31, 33, 34, 35, 36, 37, 38, 39.
  • means 61, 62, 63, 64, 65, 66, 67, 68 for mutually locking adjacent members, 31, 33, 34, 35, 36, 37, 38, 39, 40 of the extensible arm in the mutually extended position and/or in the mutually retracted position of the arm members.
  • each tubular member has at the upstream end of it a respective socket or hole 60a and at the downstream end of it a respective socket or hole 60b for corresponding locking means 61, 62, 63, 64, 65, 66, 67, 68.
  • the means for mutually locking the arm sliding members comprise a respective engagement pin 60.
  • each engagement pin 60 is integral with the respective sliding member.
  • the first preferred embodiment of the crane has mutual locking means 61, 62, 63, 64, 65, 66, 67, 68 which comprise a plurality of engagement pins 60
  • each pin 60 is mounted at the respective end of the respective sliding member 33, 34, 35, 36, 37, 38, 39, 40.
  • the mutual locking means 61, 62, 63, 64, 65, 66, 67, 68 are each in the form of a respective pin or piston 60 which is mounted at the respective upstream end of the respective sliding member 33, 34, 35, 36, 37, 38, 39, 40 and which is movable between a position where it engages corresponding sockets or cavities 60a, 60b at opposite ends of the respective member 31, 33, 34, 35, 36, 37, 38, 39 of the extensible arm 3 and a position where it disengages the sockets 60a, 60b.
  • the pin or piston 60 is movable vertically between an extended or drawn out position where it is inserted in corresponding vertical-axis through sockets or openings, 60a, 60b, and a retracted or drawn in position where it is disengaged from the sockets 60a, 60b.
  • the pin or piston 60 is movable between a drawn out position where it engages the respective upstream socket 60a of the tubular member adjacently outside the tubular member that mounts that locking pin, and a drawn in position where it disengages and allows free sliding of that tubular member towards an extended position of that outside tubular member, and where the movable pin or piston 60 is again movable between the drawn in disengagement position and a drawn out position of engagement with the respective downstream socket 60b of the same tubular member adjacently outside the tubular member, and vice versa during retraction of the extensible arm.
  • the locking pin 60 is slidable in a corresponding tubular housing 60', and in particular, as illustrated, extends vertically and is integral with the respective sliding member 33, 34, 35, 36, 37, 38, 39, 40, the tubular housing 60' being open at the top and forming a respective hole 60" made in the top wall of the same sliding member.
  • the tubular housing 60' for the locking pin is therefore inside the respective tubular member.
  • housings 60' of the respective locking pins are longitudinally aligned with each other.
  • the mutual locking means 60 also comprise a respective longitudinal plate forming two-way engagement means for respective means for moving, or activating and deactivating, the locking pin.
  • the plates 60"a for gripping the mutual locking means or pistons 60 are aligned with each other.
  • the means for activating and deactivating the mutual locking means 60 comprise a forked end 601 for gripping the respective plate portion 60" a.
  • advantageous means 7 are provided for activating and deactivating the mutual locking means 61, 62, 63, 64, 65, 66, 67, 68.
  • the means 7 for activating and deactivating the mutual locking means 61, 62, 63, 64, 65, 66, 67, 68 are movable longitudinally to be positioned at respective mutual locking means 61, 62, 63, 64, 65, 66, 67, 68.
  • the activation and deactivation means 7 move the mutual locking means 60 between an extended locked position and a retracted disengaged position.
  • the means 7 for activating and deactivating the mutual locking means 61, 62, 63, 64, 65, 66, 67, 68 are mounted on a corresponding end sliding member 40 forming part of the plurality of members of the telescopic arm 3.
  • the means for activating and deactivating the mutual locking means are in the form of a corresponding actuator 7 having one end equipped with means for bilaterally engaging a corresponding plate 60"a of the locking pin 60.
  • each locking pin 60 has a corresponding extension 60'a terminating with a plate 60"a, which is engaged by a corresponding forked portion which is integral with the bilaterally movable rod of the activating and deactivating actuator 7.
  • Means are provided for longitudinally moving the means 7 for activating and deactivating the mutual locking means 61, 62, 63, 64, 65, 66, 67, 68.
  • an actuator 8 having a respective rod 81 which mounts the vertical actuator 7 at a respective free end of it, and a cylinder 82 which is integral with the cylinder 41b of the first telescopic drive actuator 41.
  • the actuator 8 which mounts the means 7 for activating and deactivating the mutual locking means 60 is integral with and mounted on a corresponding longitudinal end sliding member 40 forming part of the plurality of members of the telescopic arm 3.
  • the means for moving, or shifting, the means for activating the locking pin move the activation means 7 to the means for locking corresponding sliding members, in particular, adjacent and consecutive sliding members.
  • the movable rods of the longitudinal telescopic drive cylinders 41 and 42 and of the cylinder 8 for longitudinally moving the means for activating and deactivating the mutual locking means extend in a rearward direction, that is to say, towards the upstream mounting end, in particular towards the end where the extensible arm 3 is mounted to the pivoting arm.
  • the locking actuator 61 at the end of the rod of the first extending actuator 41 slots into the seats or openings in the sidewalls of the member 31, which connects to the pivoting arm of the crane, in such a way as to engage that member
  • the activation and deactivation actuator 8 disengages the locking pin 60 of the corresponding locking means 61, which connects the base member 31, mounted to the pivoting arm of the crane, to the adjacently inside member 33 causing it to come out of the respective upstream socket 60a of the base member 31.
  • the activation and deactivation actuator carries the corresponding locking pin 60 of the locking means 61 until it slots into the socket 60b downstream, that is, at the other end of the tubular member 31, thereby securely locking the tubular member 31 to the tubular member 33 adjacent to it in the extended condition.
  • the positioning actuator 8 retracts a little or causes the respective rod to withdraw a little, and positions the actuator 7 for activating and deactivating the mutual locking means at the locking means 62 between the sliding member 33 and the adjacently inside sliding member 34, thereby releasing them, that is to say, drawing the pin 60 out of the upstream socket 60a of the tubular member 33.
  • the transversal engagement actuator 51 of the first drive actuator 41 is disengaged from the corresponding tubular member 31 and the corresponding rod 41b withdraws into the respective cylinder 41d, thereby positioning the respective engagement element 51 at the openings of the remaining sliding members, as illustrated in Figure 4 .
  • the second telescopic extension actuator 42 draws out the corresponding rod 42a, thereby causing the members downstream of the member 33 to move longitudinally until reaching the end position where the member 33 is fully extended relative to the base member 31, as illustrated in Figure 4 .
  • the activation and deactivation means engage the pin 60 of the respective locking means 62 with the socket 60b at the downstream end of the tubular or sliding member 33.
  • the positioning actuator 8 positions the actuator 7 for activating and deactivating the mutual locking means at the locking means 63 between the sliding member 34 and the sliding member 35 adjacently inside it, thereby releasing them, that is to say, drawing the pin 60 out of the upstream socket 60a of the tubular member 34.
  • extension procedures can continue as described until the telescopically extensible arm is fully extended.
  • retraction involves first withdrawing the end sliding member 40 and then, progressively, the sliding members 39, 38, 37, 36, 35, 34 and 33
  • the locking pistons 60 are disengaged from the downstream socket 60b and once again engaged with the upstream socket 60a of the adjacent tubular member.
  • Figures 6A to 6D illustrate a second preferred embodiment 103 of the extensible arm applicable to a crane, for example of the type described above with reference to the first preferred embodiment.
  • the second preferred embodiment of the extensible arm has components which are similar to those of the first preferred embodiment and which, to avoid making this description too lengthy, are denoted by the same reference characters and will not be commented upon again in detail.
  • the means for activating and deactivating the locking means are mounted directly on both the telescopic drive means 41, 42.
  • the means for activating and deactivating the locking means 61, 62, 63, 64, 65, 66, 67, 68 comprise a first actuator 107a for activating and deactivating the locking means and which is mounted on the first telescopic drive actuator 41, and a second actuator 107b for activating and deactivating the locking means and which is mounted on the second telescopic drive actuator 42.
  • the first and second actuators 107a, 107b for activating and deactivating the locking means and which are mounted on the first and second telescopic drive actuators 41, 42 are driven alternately by operating on the respective means for locking the consecutive sliding members.
  • each actuator 107a, 107b for activating and deactivating the locking means and mounted on a respective actuator 41, 42 is located at one end of the respective cylinder 41b, 42b, and more specifically, at the end from which the telescopic drive rod 41a, 42a come out.
  • the respective telescopic drive actuator 41, 42 is provided with a second positioning rod 141, 142 which extends from the end opposite the one from which the telescopic extension rod 41a, 42a extends.
  • the positioning rods 141, 142 are driven by a corresponding control chamber provided inside each cylindrical body 41b, 42b.
  • the locking actuator 51 at the end of the cylinder of the first extending actuator 41 slots into the seats or openings 53 in the sidewalls of the member 31, which connects to the pivoting arm of the crane, in such a way as to engage that member.
  • the first activation and deactivation actuator 107a disengages the corresponding locking pin 60 of the corresponding locking means 61, which connects the base member 31 to the adjacently inside member 33 causing it to come out of the respective upstream socket 60a
  • the activation and deactivation actuator 107a carries the corresponding locking pin 60 of the locking means 61 until it slots into the socket 60b downstream, that is, at the other end of the tubular member 31, thereby securely locking the tubular member 31 to the tubular member 33 adjacent to it in the extended condition.
  • the transversal engagement actuator 51 is disengaged from the corresponding tubular member 31 and the corresponding rod 41a withdraws into the respective cylinder 41b, thereby positioning the respective engagement element 51 at the openings 53 of the tubular member 34 , as illustrated in Figure 9
  • the second telescopic extension drive actuator 42 in turn, and simultaneously, while the respective transversal engagement actuator 52 remains engaged with the tubular member 33, that is to say, with the openings 54 in that member, draws out the corresponding rod 42a, thereby causing the members downstream of the member 33 to move longitudinally relative to the member 33 until reaching the end position where the member 34 is fully extended relative to the adjacent member 33, as illustrated in Figure 9 .
  • the activation and deactivation means 107b engage the pin 60 of the respective locking means 62 with the socket 60b at the downstream end of the tubular or sliding member 33.
  • the means 141 for moving the activation means 107a provided on the first telescopic extension means 41 withdraw.
  • the rod 141 withdraws into the respective control chamber inside the cylinder 41b, moving the respective end of the cylinder 41b, which mounts the first activation and deactivation means 107a, to the next locking means 63, thereby proceeding to the next releasing operation between the sliding member 34 and the sliding member 35.
  • each of the means 142 for moving the respective activation and deactivation means 107b position the latter at the next locking means 64, as illustrated in Figure 10 .
  • extension procedures can then continue as described until the telescopically extensible arm is fully extended.
  • retraction involves first withdrawing the end sliding member 40 and then, progressively, the sliding members 39, 38, 37, 36, 35, 34 and 33.
  • the locking pistons 60 are disengaged from the downstream socket 60b and once again engaged with the upstream socket 60a of the adjacent tubular member.
  • Figures 11A to 11F illustrate a third preferred embodiment of a telescopically extensible arm applicable to a crane as described in connection with the first preferred embodiment.
  • the extensible arm 203 of the third preferred embodiment comprises a plurality of tubular members, in particular comprising a tubular member 31 for connection to the pivoting arm of the crane, an end sliding member 40, and between these, a plurality of sliding tubular members 33, 34, 35, 36, 37, 38, 39.
  • the third preferred embodiment comprises telescopic drive means comprising a first and a second actuator 41, 42, exactly the same as those of the first preferred embodiment and therefore not commented upon in detail and which, in this case, too, have a respective cylinder 41b, 42b that is connected to the end sliding member 40 at a respective upstream end of the latter. From each of the cylinders 41b, 42b there extends a corresponding rod 41a, 42a at the end of which there are transversal actuators 51, 52 for engaging and disengaging the respective members of the telescopic arm 203 and which operate with corresponding openings that are exactly the same as those of the preceding embodiments.
  • the third preferred embodiment also comprises advantageous means 290 for mutually and releasably locking the members of the telescopic arm and which are adapted to release the tubular members in sequence.
  • means 290 are provided for mutually and releasably locking the members of the telescopic arm and which are adapted to release the members of the telescopic arm sequentially from the outermost one to the innermost one.
  • the third preferred embodiment also comprises means 290 for mutually and releasably locking the members of the telescopic arm and which are adapted to release the members of the arm in sequence.
  • the means 290 for mutually and releasably locking the members of the telescopic arm are adapted to lock the members of the arm sequentially from the innermost one to the outermost one.
  • the third preferred embodiment also comprises means 290 for mutually and releasably locking the members of the telescopic arm and which are adapted to release the tubular members in sequence and to lock the tubular members in sequence.
  • the means 290 for mutually and releasably locking the members of the telescopic arm are adapted to engage and retain the respective members of the arm in the mutually retracted position.
  • the means 290 for mutually and releasably locking the members of the telescopic arm comprise a pin which is movable into one or more positions for locking and releasing corresponding members of the telescopic arm.
  • the means for mutually and releasably locking the members of the telescopic arm are driven by a corresponding actuator 290, more specifically one in the form of an actuator that can be activated and deactivated by control, in particular, of electrical or hydraulic type.
  • the third preferred embodiment also comprises, at the end of the cylinder 41 opposite the end from which there extends the longitudinal drive rod 41a of the corresponding means 290 for engagement with and connection to the end sliding member, 40, and for locking the members 31, 33, 34, 35, 36, 37, 38, 39, 40 of the telescopic in the retracted condition.
  • the means for engaging or locking the members of the extensible arm in the retracted condition are formed by at least one corresponding pin which slots into a corresponding opening made in the tubular members, in particular in the sidewalls of the latter and which is mounted on a corresponding transversal actuator 290 housed inside the tubular members of the arm.
  • the actuator 290 for locking the members of the extensible arm in the retracted position is inside the tubular members.
  • the actuator 290 for locking the members of the extensible arm in the retracted position is at the end of a corresponding telescopic drive actuator.
  • the actuator 290 for locking the members of the extensible arm in the retracted position is, more specifically, at the end of the telescopic drive actuator 41.
  • the transversal actuator comprises a first and a second locking pin 291, 292 extending transversally, movable simultaneously in opposite directions and adapted to act in conjunction with respective surfaces or holes 293, provided, as illustrated in Figures 11E and 11F , in the sidewalls of the sliding members. That way, it is possible to lock the tubular members to each other in the retracted position, releasing them progressively in sequence, or one by one, to allow each to slide longitudinally to the corresponding extended position.
  • the locking means 290 are also adapted to engage the tubular members 31, 33, 34, 35, 36, 37, 38, 39, not only before the tubular members are extended but also after they return to the respective retracted position.
  • the means for mutually locking adjacent members 31, 33, 34, 35, 36, 37, 38, 39, 40 can be activated automatically when the selfsame arm members 31, 33, 34, 35, 36, 37, 38, 39, 40 are in the respective mutually extended position.
  • the means for mutually locking adjacent members 31, 33, 34, 35, 36, 37, 38, 39, 40 comprise a corresponding locking pin 260 which is subjected to the action of respective elastic activation means 261.
  • the means for mutually locking the members of the extensible arm are mounted on a respective tubular member of the telescopic arm and lock that tubular member to the tubular member adjacent to it and, more specifically, on the outer side of it.
  • the activation means are in the form of a spring 261 which normally pushes the pin 260 into a condition suitable for locking corresponding members of the extensible arm to each other.
  • the locking pin 260 mounted on a respective member of the arm, engages a corresponding socket 60b of an adjacent tubular member.
  • the locking pin 260 is movable between a position where it is engaged with, and a position where it is disengaged from, the socket 60b for retaining the selfsame locking pin.
  • the locking pin 260 is housed and slidable in a corresponding bush 260'.
  • the locking pin 260 is housed in a matching bush 260' which also houses the elastic activation means 261.
  • the elastic means 261 push the locking pin 260 out of the bush to protrude through a hole F in the tubular member which the locking means are associated with.
  • the bush is integral with a respective member of the telescopic arm.
  • the locking means 260 in particular in the form of a respective locking pin and mounted on a respective member of the telescopic arm, slide against the inside surface of the member of the telescopic arm adjacent to the one that mounts the locking means, until they reach a matching socket 60b provided in that adjacent member, engaging the socket 60b in such a way as to mutually lock those members of the telescopic arm.
  • the locking means 260 slide easily against a corner portion of the corresponding tubular member, this corner portion being formed by adjacent walls which are at angle to each other and which, more specifically, make an obtuse angle.
  • the deactivation means 262 oppose the elastic pushing means 261 in the activated condition, in particular in such a way as to disengage the locking pin 260 from the respective retaining socket 60b.
  • means are advantageously provided for mutually locking adjacent members 31, 33, 34, 35, 36, 37, 38, 39, 40 and which can be activated and deactivated automatically.
  • means are advantageously provided for mutually locking adjacent members 31, 33, 34, 35, 36, 37, 38, 39, 40 in the mutually extended position and which can be activated and deactivated automatically. In this case, less actuators and related hoses are required.
  • These means for mutually locking the members of the extensible arm are labelled 161, 162, 163, 164, 165, 166, 167 and are fixed at the upstream end of the respective tubular member in such a way as to lock each of the tubular members 33, 34, 35, 36, 37, 38, 39 to the tubular member 31, 33, 34, 35, 36, 37, 38 adjacently outside it, in the extended position.
  • Each of the locking means 161, 162, 163, 164, 165, 166, 167 comprises, as illustrated in Figure 11D , a respective locking pin 260 which is operated upon by corresponding elastic activation means 261 and corresponding deactivation means 262, opposing the action of the spring 261 and whose deactivating action is accomplished by engaging a corresponding inside surface S of the tubular member adjacently inside the one that mounts the locking means.
  • the locking pin 260 is housed inside a corresponding cylindrical chamber or bushing 260', with the spring 261 located at the bottom of it to normally push the pin 260 out of the bush to protrude through the corresponding socket or hole F in the tubular member these locking means are associated with, that is to say which the hollow cylindrical body 260' is fixed to.
  • the means 262 for deactivating or withdrawing the pin 260 are activated by engaging a corresponding inside surface S at the end of the adjacently inside surface.
  • the deactivation means comprise a wheel 262 which is mounted on a respective bar 263 integral with an element 265 which is longitudinally or vertically movable inside the bush 260' and which is provided with respective means 266 for releasably hooking onto the piston or pin 260.
  • the wheel mounting bar 263 passes through and is vertically movable in a corresponding slot 264 made in the sidewall of the vertical cylindrical housing 260'.
  • the slot 264 is vertically elongate to allow the means 262 to move in it as one with the hooking and drive element 265 and the corresponding piston 260.
  • the vertical housing 260' has a respective bottom wall 260'a and a sidewall 260'b and is open at the top to allow the locking pin or piston 260 to come out of it.
  • releasable hooking means are provided between the locking pin 260 and the deactivation means 262, that is to say, hooking means which can be engaged with and disengaged from the pin 260 and which comprise an annular element 266 having corresponding opposite portions 266a, 266b which can be inserted into and taken out of a suitable radial housing or groove 267 made in the bottom part of the body of the locking pin 260, that is top say, at a collar or reduced diameter portion 260".
  • the hooking element 265 which mounts the hooking ring 266 and which slides vertically relative to the housing 260'.
  • the hooking element 265 is in turn internally hollow, or has a cylindrical cavity and coaxially houses the locking pin 260 or a bottom part of it 260".
  • the locking pin 260 can move vertically relative to the cylindrical element 265, as will become clearer as this description continues.
  • the hooking element 265 is adapted to slide vertically relative to the fixed outer housing 260' under the action of corresponding spring means 268 located between the bottom of the bush 260' and an opposite annular shoulder of the movable element 265 (not illustrated in detail in the drawings), the element 265 moving between a lowered position and a raised position where it hooks onto the locking pin 260 through the ring 266.
  • engagement means are provided for engaging the hooking ring or element 266 to the locking pin 260 when the same are in the raised condition.
  • These engagement means comprise an inside surface 269 of a circumferential protrusion 269a fixed to the upper part of the bush 260' and extending towards the inside of the bush 260' itself.
  • the protrusion 269 acts in conjunction, or interferes, with an outside surface 266c of the hooking ring in order to force corresponding portions 266a, 266b of the ring into the hooking pin engagement groove 267.
  • the annular hooking element 266 is movable radially or transversally relative to the element 265 between an inside position where it hooks onto the locking pin 260, corresponding to the raised position of the element 265 and piston 260, and an outside position where the piston 260 is released, corresponding to a position where the piston 260 is lowered further down relative to the drive element 265.
  • Disengagement means are also provided between the locking pin 260 and the hooking and drive means 265, these disengagement means comprising opposing means 263' acting on the locking pin 260 in such a way as to move it downwards against the action of the spring 261, while the annular element 266 is vertically withheld and thus protrudes from the groove 267 in the piston 260.
  • the opposing means comprise a corresponding downwardly or inwardly protruding portion 263' provided on the inside face of the tubular member (more specifically, the tubular members 31, 33, 34, 35, 36, 37, 38) adjacently outside the one that mounts the locking means 260, in particular at the upstream end of that tubular member (namely, the tubular members 31, 33, 34, 35, 36, 37, 38).
  • the transversal piston 290 for locking the arm in the retracted condition is disengaged from the base tubular member or outermost member 31 connecting to the pivoting arm of the crane, and the first actuator 41 extends the corresponding rod 41a in such a way as to move the remaining tubular members relative to the member 31 towards the respective extended condition illustrated in Figure 12 .
  • the locking means 260 pass from the position shown in Figure 15A , corresponding to that of Figure 11D , where the piston 260 is in the lowered position, under the pushing action of the protuberance 263', to the position of Figures 15B and 15C , where the piston 260 has risen freely relative to the hooking element 265 under the action of the respective spring 261, and slides against the inside surface S' of the outer tubular member.
  • the hooking element 265 is pushed by the spring means 268 towards the extended or raised position of the locking pin 260, causing the insertion ring 266 to interfere with the circumferential surface 269, in such a way as to slot into the peripheral groove 267 of the locking pin 260.
  • the extension procedure then continues in a similar manner, as illustrated in Figure 14 , to extend the member 35 on the inside of the member 34 that has been extended, and so on until the entire arm is completely extended, if necessary.
  • retraction involves first withdrawing the end sliding member 40 and then, progressively, the sliding members 39, 38, 37, 36, 35, 34 and 33
  • the locking means 161, 162, 163, 164, 165, 166, 167 are disengaged automatically.
  • withdrawal of the inside tubular member causes the wheel 262 to engage the inside surface of that member, thereby pulling downwards the locking pin 260, whose ring 266 is in the inserted condition, and thus causing the locking pin 260 to come out of the socket 60b of the respective outside tubular member.
  • the tubular member which mounts the respective locking pin is made to withdraw in such a way that its top face slides against the inside surface of the outside tubular member, in a similar way to that illustrated in Figure 15C , until reaching the respective retracted position where a protrusion 263 causes the pin 260 to be lowered and released, as described above, from the hooking element 265, that is to say, causing the corresponding portions of the ring 266 to come out of the groove 267 of the locking pin 260 itself, as illustrated in Figure 15H .
  • FIG. 16A to 23F A fourth preferred embodiment of the crane, not covered by the claimed invention, is illustrated in Figures 16A to 23F .
  • the fourth preferred embodiment 303 of the telescopic arm has components which are similar to those of the preceding preferred embodiments and which, to avoid making this description too lengthy, are denoted by the same reference characters and will not be commented upon again in detail.
  • the fourth preferred embodiment has telescopic drive means 4 which are mounted on the base member 31.
  • the telescopic drive means 4 of the fourth preferred embodiment 303 have an end which is fixed to, or integral with, the base member 31 of the telescopic arm.
  • the fourth preferred embodiment like the third preferred embodiment, also comprises advantageous means 390a, 390b for mutually and releasably locking the members of the telescopic arm and which are adapted to release the tubular members in sequence.
  • means 390a, 390b are provided for mutually and releasably locking the members of the telescopic arm and which are adapted to release the members of the telescopic arm sequentially from the innermost one progressively to the outermost one.
  • the fourth preferred embodiment also comprises means 390a, 390b for mutually and releasably locking the members of the telescopic arm and which are adapted to release the members of the arm in sequence.
  • the means 390a, 390b for mutually and releasably locking the members of the telescopic arm are adapted to lock the members of the arm sequentially from the outermost one progressively to the innermost one.
  • the fourth preferred embodiment also comprises means 390a, 390b for mutually and releasably locking the members of the telescopic arm and which are adapted to release the tubular members in sequence and to lock the tubular members in sequence.
  • the means 390a, 390b for mutually and releasably locking the members of the telescopic arm are adapted to engage and retain the respective members in the mutually retracted position.
  • the means for mutually and releasably locking the members of the telescopic arm comprise a first and a second pin 390a, 390b which are movable into one or more positions for locking and releasing corresponding members of the telescopic arm.
  • the means for mutually and releasably locking the members of the telescopic arm are driven by corresponding first and second actuators 390a, 390b, more specifically in the form of actuators that can be activated and deactivated by control, in particular, of electrical or hydraulic type.
  • the fourth preferred embodiment has means for mutually locking adjacent members 31, 33, 34, 35, 36, 37, 38, 39, 40 in the retracted position, these locking means comprising at least one actuator and, more specifically, a first and a second actuator 390a, 390b which drive a respective locking pin and which are adapted to disengage the members 31, 33, 34, 35, 36, 37, 38, 39 in sequence to allow said members to slide towards the extended position and to re-engage said members after they have returned to the retracted position.
  • these locking means comprising at least one actuator and, more specifically, a first and a second actuator 390a, 390b which drive a respective locking pin and which are adapted to disengage the members 31, 33, 34, 35, 36, 37, 38, 39 in sequence to allow said members to slide towards the extended position and to re-engage said members after they have returned to the retracted position.
  • each actuator 390a, 390b for locking the members of the extensible arm in the retracted position is located, or extends, outside the tubular members and is fixed to the base member 31 in such a way as to be situated close to the end of a corresponding telescopic drive actuator.
  • the means for mutually locking adjacent members 31, 33, 34, 35, 36, 37, 38, 39, 40 in the retracted position comprise a first and a second actuator 390a, 390b for corresponding pins for locking the members of the extensible arm, these pins extending transversally and horizontally and slotting into corresponding openings made in the opposite sidewalls of the tubular members.
  • each locking actuator has a respective pin 391a, 391b which slots into a corresponding opening made in the tubular members of the arm.
  • first and second actuators 390a, 390b extend transversally and horizontally on opposite sides of the base member 31.
  • sliding means P are provided which are interposed between the sliding members or tubular members. These sliding means are in the form of corresponding runner means P. More specifically, the sliding means P comprise rotatable means which are adapted to create rolling friction and which are positioned, as illustrated in Figures 21 and 22 , between opposite faces of adjacent tubular members.
  • the rolling friction means forming the runner comprise corresponding revolving rollers which are not illustrated in detail in the accompanying drawings.
  • the fourth preferred embodiment also comprises means for mutually locking adjacent members 31, 33, 34, 35, 36, 37, 38, 39, 40 and which can be activated and deactivated automatically.
  • means are advantageously provided for mutually locking adjacent members 31, 33, 34, 35, 36, 37, 38, 39, 40 in the mutually extended position and which can be activated and deactivated automatically. In this case, less actuators and related hoses are required.
  • Each of the locking means 361, 362, 363, 364, 365, 366, 367 comprises, as illustrated in Figure 23A , a respective locking pin 260 which is operated upon by corresponding elastic activation means 261 and corresponding deactivation means 262, opposing the action of the spring 261 and whose deactivating action is accomplished by engaging a corresponding protrusion or nib N1, N2, as may be better inferred from Figure 23E , and as will become clearer as this description continues.
  • the locking pin 260 is housed inside a corresponding cylindrical chamber or bushing 260', with the spring 261 located at the bottom of it to normally push the pin 260 out of the bush to protrude through the corresponding socket or hole F in the tubular member which the locking means are associated with, that is to say which the hollow cylindrical body 260' is fixed to.
  • the deactivation means comprise a wheel 262 which is mounted on a respective bar 263 integral with an element 265 which is longitudinally or vertically movable inside the bush 260' and which is provided with respective means 265' for releasably hooking onto the piston or pin 260.
  • the wheel mounting bar 263 passes through and is vertically movable in a corresponding slot 264 made in the sidewall of the vertical cylindrical housing 260'.
  • the slot 264 is vertically elongate to allow the means 262 to move in it as one with the corresponding piston 260.
  • the vertical housing 260' has a respective bottom wall 260'a and a sidewall 260"a and is open at the top to allow the locking pin or piston 260 to come out of it.
  • releasable hooking means are provided between the locking pin 260 and the deactivation means 262, that is to say, hooking means which can be engaged with and disengaged from the pin 260 and which comprise respective detents 265' inserted in a suitable radial housing or groove 267 made in the bottom part of the body of the locking pin 260, that is to say, at a collar or reduced diameter portion 260".
  • the hooking element 265 is coaxially mounted and moves in the vertical housing 260', sliding vertically relative to the latter.
  • the hooking element 265 is in turn internally hollow and cylindrical and coaxially houses the locking pin 260.
  • the hooking element 265 is adapted to slide vertically relative to the fixed outer housing 260' under the action of corresponding spring means 268 located between the bottom of the bush 260' and an opposite annular shoulder of the movable element 265 (not specifically indicated in the drawing), between a raised position where the locking pin 260 is hooked and a lowered position where the locking pin 260 is in a disengaged condition, reached under the driving action of the element 265.
  • the deactivation means 262 are activated by engagement with a corresponding inside or underside surface S of a protruding element or nib N1, N2 located at the end of a corresponding telescopic drive actuator 41, 42.
  • Each protruding element or nib N1, N2 is movable between a position where it engages the wheel 262 and a position of free passage beyond the locking block and, more specifically, for the purpose, it is rotatable or angularly movable, as indicated by the arrows FR between a first vertical position for engaging the wheels 262 and a second position of free passage, illustrated in Figure 16E .
  • protruding element or disengagement nib N1, N2 is moved longitudinally, as indicated by the arrows FL in Figure 16E , to be positioned at a locking pin or element to be operated on.
  • the transversal locking pistons 390a and 390b of the arm in the retracted condition release the tubular end member or innermost member 40 and the first actuator 41 extends the corresponding rod 41a in such a way as to move the end member, which carries the load, towards the respective extended position, illustrated in Figure 17 .
  • the locking means 260 slide against the inside surface of the outside tubular member and when the locking piston or pin 260 reaches a socket 60b at the downstream end of the inside tubular member 40, the action of the spring 261 pushes it into the socket 60b, thus locking the inside tubular member 40 to the downstream end of the outside tubular member 39, as shown in Figure 17 .
  • retraction involves first withdrawing the tubular members which are closest to the base member 31, that is to say, the sliding members 33, 34, 35, 36, 37, 38, 39 and lastly the end sliding member 40.
  • the locking means 361, 362, 363, 364, 365, 366, 367 are disengaged automatically thanks to the respective protrusions or nibs N1, N2.
  • FIG. 24A to 26 A fifth preferred embodiment of the crane, not covered by the claimed invention, is illustrated in Figures 24A to 26 .
  • the fifth preferred embodiment of the extensible arm has components which are similar to those of the preceding preferred embodiments and which, to avoid making this description too lengthy, are denoted by the same reference characters and will not be commented upon again in detail.
  • the fifth preferred embodiment of the extensible arm is substantially similar to the second preferred embodiment from which it differs in that it comprises telescopic drive means 4 which are mounted on the base member 31.
  • the telescopic drive means 4 of the fifth preferred embodiment have an end which is fixed to, or integral with, the base member 31 of the telescopic arm.
  • the fifth preferred embodiment comprises sliding means which are interposed between the sliding members and which are exactly the same as those of the fourth preferred embodiment and therefore not illustrated in detail.
  • These sliding means are in the form of corresponding runner means and, more specifically, comprise rotatable means designed to create rolling friction.
  • the locking actuator 51 at the end of the cylinder of the first extending actuator 41 slots into the seats or openings in the sidewalls of the member 40, which connects to the pivoting arm of the crane, in such a way as to engage that member.
  • the first activation and deactivation actuator 107a disengages the corresponding locking pin 60 of the corresponding locking means 68, which connects the end member 40 of the crane to the adjacently inside member 39 causing it to come out of the respective upstream socket 60a.
  • the activation and deactivation actuator 107a carries the corresponding locking pin 60 of the locking means 68 until it slots into the socket 60b downstream, that is, at the other end of the tubular member 39, thereby securely locking to it the tubular member 40 in the extended condition.
  • the activation and deactivation means or actuator 107b mounted on the cylinder 42b of the second telescopic drive actuator 42 release the corresponding pin 60 of the locking means 67 which connects immediately adjacent tubular members 39 and 38 to each other, causing the pin 60 to come out of the respective socket 60a at the upstream end of the tubular member 38.
  • the transversal engagement actuator 51 is disengaged from the corresponding tubular member 40 and the corresponding rod 41a withdraws into the respective cylinder 41b, thereby positioning the respective engagement element 51 at the lateral opening the inside member 38.
  • the second telescopic extension actuator 42 draws out the corresponding rod 42a, thereby causing the member 39 to move longitudinally or be drawn out relative to the outside member 38 until reaching the end position where the member 39 is in the extended condition relative to the adjacent member 38.
  • the activation and deactivation means 107b engage the pin 60 of the respective locking means 67 with the socket 60b at the downstream end of the tubular or sliding member 38.
  • means which are similar to the means 141 described in connection with the second preferred embodiment move the activation means 107a located on the first telescopic extension means 41.
  • the rod 141 is withdrawn.
  • a rod not illustrated in detail and similar to the rod 141 of the second referred embodiment, withdraws into the respective control chamber inside the cylinder 41b, moving the respective end of the cylinder 41b, which mounts the first activation and deactivation means 107a, to the next locking means 66, thereby proceeding to the next releasing operation between the sliding member 38 and the sliding member 37
  • means similar to the means of the second preferred embodiment move the respective activation and deactivation means 107b and position the latter at the next locking means 65.
  • the extension procedure can then continue as described until the telescopically extensible arm is fully extended.
  • the extension procedure can then continue as described until the telescopically extensible arm is fully extended.
  • retraction involves first withdrawing the sliding member 33 and then, progressively, the sliding members 34, 35, 36, 37, 38, 39 and 40
  • the locking pistons 60 are disengaged from the downstream socket 60b and once again engaged with the upstream socket 60a of the respective adjacent tubular member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Control And Safety Of Cranes (AREA)
EP11716649.6A 2010-03-01 2011-02-28 A crane for lifting a load Revoked EP2542495B1 (en)

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IT000120A ITBO20100120A1 (it) 2010-03-01 2010-03-01 Gru per il sollevamento di un carico.
PCT/IB2011/050850 WO2011107929A2 (en) 2010-03-01 2011-02-28 A crane for lifting a load

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EP2542495A2 EP2542495A2 (en) 2013-01-09
EP2542495B1 true EP2542495B1 (en) 2021-02-17

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CN106219421B (zh) * 2016-08-31 2018-11-20 北汽福田汽车股份有限公司 一种多级伸缩机构及工程机械
CN110255399B (zh) * 2019-06-17 2020-09-08 徐州徐工液压件有限公司 一种超大吨位起重机伸缩液压缸用悬空式滑道爬升结构
JP7275994B2 (ja) * 2019-08-21 2023-05-18 株式会社タダノ 作業機
JP7279579B2 (ja) * 2019-08-21 2023-05-23 株式会社タダノ 作業機
DE102020129762B3 (de) * 2020-11-11 2022-02-17 Tadano Demag Gmbh Teleskopausleger eines Mobilkrans

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EP1321426A1 (de) 2001-12-21 2003-06-25 Demag Mobile Cranes GmbH & Co. KG Teleskopausleger
JP2004210517A (ja) 2003-01-08 2004-07-29 Tadano Ltd 移動式クレーンのブーム伸縮機構
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US3770138A (en) 1971-04-15 1973-11-06 Fmc Corp Sequenced crane boom
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EP1321426A1 (de) 2001-12-21 2003-06-25 Demag Mobile Cranes GmbH & Co. KG Teleskopausleger
JP2004210517A (ja) 2003-01-08 2004-07-29 Tadano Ltd 移動式クレーンのブーム伸縮機構
JP2004323207A (ja) 2003-04-25 2004-11-18 Tadano Ltd ブーム伸縮機構
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WO2011107929A2 (en) 2011-09-09
EP2542495A2 (en) 2013-01-09
ITBO20100120A1 (it) 2011-09-02
WO2011107929A3 (en) 2012-03-01

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