EP3971126B1 - Crane - Google Patents

Crane Download PDF

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Publication number
EP3971126B1
EP3971126B1 EP21196542.1A EP21196542A EP3971126B1 EP 3971126 B1 EP3971126 B1 EP 3971126B1 EP 21196542 A EP21196542 A EP 21196542A EP 3971126 B1 EP3971126 B1 EP 3971126B1
Authority
EP
European Patent Office
Prior art keywords
boom
upright
frame
counter
crane
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.)
Active
Application number
EP21196542.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3971126A1 (en
Inventor
Mariano Moritsch
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.)
Moritsch Cranes Srl
Original Assignee
Moritsch Cranes Srl
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Publication date
Application filed by Moritsch Cranes Srl filed Critical Moritsch Cranes Srl
Publication of EP3971126A1 publication Critical patent/EP3971126A1/en
Application granted granted Critical
Publication of EP3971126B1 publication Critical patent/EP3971126B1/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
    • B66C23/82—Luffing gear
    • 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
    • B66C23/88—Safety gear

Definitions

  • the present invention relates to a crane, namely a cable crane, as defined in the preamble of claim 1.
  • the present invention is used advantageously, but without limitation, to lift and move loads, such as materials and/or goods, e.g. for the construction of buildings.
  • Cable cranes are known in the art for lifting and moving loads. These cranes comprise a base body, which rests on a bearing surface, and has a movable boom connected thereto to form an angle with the body in the vertical and horizontal directions. Specifically, this boom extends between a lower portion, hinged to the body, and an upper portion, indirectly connected to the body by a cable.
  • Such cable cranes also comprise two or more drums, one of which has the load-bearing cable wound thereupon.
  • the possibility of having the load-bearing cable mounted to a motor-driven drum affords quicker tensioning and haul back after work, which will reduce assembly and disassembly times.
  • Cranes are also known which use a hydraulic piston instead of the cable.
  • the crane When the crane is not in operation, whether it is a cable crane or a hydraulic piston crane, it should be advantageously moved to a parking state, i.e., by tilting the boom relative to the bearing surface to a greater extent than in the state in which the crane is working. This will reduce the overall size of the crane.
  • EP 1619159 A2 discloses the preamble of claim 1.
  • the boom may be tilted to a greater extent in the parking states, to angles close to 80°, thereby providing a considerably smaller overall size, because the piston provides structural support.
  • the technical purpose of the present invention is to provide a cable crane that can obviate the aforementioned prior art drawbacks.
  • one object of the present invention is to provide a cable crane that can afford parking angles greater than 65°, to reduce the overall dimensions in non-working states, with no risk of system collapse, while avoiding the disadvantages caused by the presence of the hydraulic piston.
  • the cable crane of the present invention solves the technical problem in that it comprises a counter-frame that can add structural stability to the system.
  • this crane can use the cable technology, without requiring a hydraulic piston, while achieving the same parking angles as the cranes with pistons.
  • the present invention relates to a crane designated by numeral 1.
  • the crane 1 comprises a base body 2 configured to rest on a bearing surface S.
  • the base body 2 preferably comprises a cabin (not shown) configured to accommodate an operator.
  • the crane 1 also comprises a boom 3 configured to move loads. This boom 3 extends away from the body 2 between a lower portion 31 and an opposite upper portion 32.
  • boom 3 is hinged to the body 2 in a hinging zone 4 at the lower portion 31.
  • the boom 3 is able move between a working state and a parking state.
  • working state means that the boom 3 is arranged for the crane to be able to perform its load lifting and/or moving task, i.e. is configured to move in the vertical and/or horizontal directions.
  • parking state refers to a state in which the crane is not working, i.e. the boom 3 is arranged to be unable to perform its load lifting and/or moving task, and is arranged to remain still.
  • the boom 3 is able to move relative to the body 2 in the horizontal and/or vertical directions when it is in the working state.
  • able to move in the horizontal direction means that the boom 3 is configured to move relative to a plane parallel to the bearing surface S, thereby defining a fixed angle whose vertex is in the hinging zone 4.
  • the boom 3 keeps a fixed tilt relative to the bearing surface S as it moves, whereas the direction of the projection P of the boom 3 on such bearing surface changes.
  • able to move in the vertical direction means that the boom 3 is configured to change its angle relative to a plane parallel to the bearing surface S as it moves, whereas the projection P of the boom 3 on the bearing surface S keeps the same direction. In other words, the boom 3 only changes its tilt relative to the bearing surface S as it moves.
  • the boom 3 also combines the above two movements as it moves, i.e. both changing its tilt relative to the bearing surface S and changing its direction on the bearing surface S.
  • the parking state is reached by a vertical movement of the boom 3.
  • the boom 3 when the crane 1 is not required to be used, the boom 3 is moved to the parking state, i.e. tilted to a position in which the length of the projection P of the boom 3 on the bearing surface S is as small as possible, to reduce the bulk. In other words, the upper portion of the boom 3 is moved upwards and as far as possible from the bearing surface S. Therefore, here, in the parking state the boom 3 forms a predetermined parking angle with a plane parallel to the bearing surface S.
  • the parking state is always a non-working state, irrespective of the angle attained by the boom 3, i.e. irrespective of the predetermined parking angle.
  • the boom 3 defines a first angular range ⁇ relative to the bearing surface S on which the body 2 lies, which ranges between a first angular value and a second angular value.
  • the crane defines a second angular range ⁇ comprising the first angular range ⁇ .
  • the first angular range ⁇ is formed by the first upright 33 and a plane parallel to the bearing surface S, and has its vertex in the hinging zone 4.
  • the second angular range ⁇ also formed by the first upright 33 and a plane parallel to the bearing surface S and having its vertex in the hinging zone 4, has the boom 3 more tilted upwards away from the bearing surface S.
  • the second angular range ⁇ is greater than the first angular range ⁇ . This is because the boom 3 is more tilted than in working states.
  • the second angular range ⁇ defines the predetermined parking angle.
  • the first angular range ⁇ may be equal to or greater than the second angular range ⁇ .
  • the boom 3 is more tilted relative to the bearing surface S than in the working state.
  • the boom 3 can be driven from a control panel, located inside the cab, and comprising driving elements.
  • the crane 1 comprises a cable 5, which is connected to the body 2 and to the boom 3 at the upper portion 32 by means of suitable drums, not shown in the figures but known to the skilled person.
  • the crane 1 of the present invention is preferably a "cable crane".
  • the crane 1 further comprises a transverse element known as A frame 12.
  • a frame 12 is connected to the body 2, and extends away from the body 2 and from the boom 3 starting from the hinging zone 4.
  • the cable 5 passes through the A frame 12 at the end of the A frame 12 that is not connected to the hinging zone 4.
  • the cable 5 is configured to be always taut. Therefore, at each movement of the boom 3, the cable winds or unwinds on/from a respective drum located in the body 2 and passes through the end of the A frame 12 not connected to the hinging zone 4.
  • the crane 1 comprises a counter-frame 6 associated with the boom 3.
  • This counter-frame 6 is configured to provide structural support to the boom 3 when the crane 1 is in a parking state.
  • the counter-frame 6 extends between a lower end 61 and an opposite upper end 62.
  • the upper end 62 of the counter-frame 6 is hinged to the boom 3.
  • the counter-frame is configured to move between a first configuration in which the lower end 61 is connected to the lower portion 31 of the boom 3 when the boom 3 is in the working state and a second configuration in which the lower end 61 of the counter-frame 6 is released from the boom 3 and is connected to the body 2 when the boom 3 is in the parking state.
  • the counter-frame 6 provides mechanical support and the boom 3 does not collapse on the cable 5.
  • predetermined parking angles of more than 65° may be safely supported, because the counter-frame 6 provides structural support to the boom 3.
  • the counter-frame 6 acts as a strut, preventing movement of the boom 3 in the vertical direction and therefore keeping it still at a predetermined angle, i.e. the predetermined parking angle.
  • the boom 3 comprises at least a first upright 33 and a second upright 34.
  • the first upright 33 extends between the hinging zone 4 and a first end 331.
  • the second upright 34 is parallel to the first upright 33 and extends to a smaller length than the first upright 33.
  • the boom 3 further comprises a first portion 35 transverse to the first upright 33 and to the second upright 34.
  • the first transverse portion 35 is configured to connect the first upright 33 with the second upright 34.
  • the first transverse portion 35 extends between the hinging zone 4 and a first end 341 of the second upright 34.
  • the boom 3 comprises a second portion 36 transverse to the first upright 33 and to the second upright 34.
  • the second transverse portion 36 is configured to connect the first upright 33 with the second upright 34.
  • the second transverse portion 34 extends between the first end 331 of the first upright 33 and a second end 342 of the second upright 34 opposite to the first end 341.
  • the counter-frame 6 is connected to the boom 3 at the first end 341 of the second upright 34.
  • the counter-frame 6 in the first configuration, is parallel to and adjacent to the first transverse portion 35, whereas in the second configuration, the counter-frame 6 is parallel to the first upright 33 and forms an extension of the second upright 34.
  • the crane 1 of the present invention is designed to be assembled in a modular manner. More in detail, the boom 3 has modules of predetermined size such as the first 35 and the second 36 transverse portions, and modules having a size that can vary from crane to crane, such as the first upright 33 and the second upright 34.
  • the counter-frame 6 is an element that can be adapted to various cranes 1 regardless of the length of the boom 3, as it is placed at the junction between the second upright 34 and the first transverse portion 35 which has a predetermined fixed length.
  • the lower end 61 of the counter-frame 6 comprises a head 7 configured to couple with the boom 3 when the boom 3 is in the working state.
  • the head 7 is also configured to couple with the body 2 when the boom 3 is in the parking state.
  • the boom 3 comprises respective first engagement means 8 and the body 2 comprises respective second engagement means 9.
  • the first engagement means 8 and the second engagement means 9 are configured to couple with the head 7.
  • the head 7 is configured to provide a male-female coupling with the first engagement means 8 and the second engagement means 9.
  • the first engagement means 8 are located at the second upright 34.
  • the first engagement means 8 comprise locking pins configured to keep the counter-frame 6 rigidly joined with the boom 3 in the working state, i.e. when the boom 3 is tilted with respect to the bearing surface S by a smaller angle than in the parking state, and is closer thereto.
  • the counter-frame 6 extends between the first end 341 of the second upright 34 and the hinging zone 4.
  • the second engagement means 9 comprise a seat 10 which is configured to receive the head 7 of the counter-frame 6.
  • the counter-frame 6 extends between the first end 341 of the second upright 34 and the seat 10.
  • the seat 10 is formed with a radial clearance with the head 7 for easier insertion of the head into the seat 10.
  • lock means 11 are provided for securing the head 7 of the counter-frame 6 to the seat 10 when the head 7 is coupled to the second engagement means 9. That is, once the head 7 is inserted in the seat 10, the lock means can hold the head 7 still inside the seat 10.
  • lock means 11 comprise a safety tooth 14 comprising a return element.
  • This return element is, for example, a spring.
  • the head 7 comprises, for example, a male insert portion 15 adapted to be inserted into the seat 10.
  • the seat 10 comprises respective female coupling portions 16 in which said male insert portion can be fitted.
  • the tooth 14 is snapped in place to close the seat 10 over the head 7.
  • the boom 3 further preferably comprises a handle 13 located at the head 7 to allow an operator to easily maneuver the boom 3 to move it to the second configuration.
  • the present invention further relates to a method of parking a crane 1 of the present invention.
  • the method comprises a first step of moving the boom 3 from the working state to an operating state to cause the boom 3 to define a predetermined operating angle with respect to the bearing surface S.
  • This step is preferably carried out mechanically by an operator inside the control cab.
  • the step of moving the boom 3 to a predetermined operating angle requires the boom 3 to be tilted by an angle that is smaller than a predetermined parking angle, with respect to the bearing surface S.
  • the method requires the counter-frame 6 to be disconnected from the boom 3.
  • the counter-frame 6 may be placed in the seat 10.
  • the counter-frame 6 oscillates by gravity until reaching a position close to the seat 10.
  • the counter-frame 6 may also be driven mechanically by motor means proximate to the seat 10.
  • these motor means may comprise a piston that accompanies the counter-frame 6 to the desired position.
  • a subsequent step of connecting the lower end 61 of the counter-frame 6 to the body 2 follows, so as to move the counter-frame 6 from the first configuration to the second configuration.
  • the step of connecting the lower end 61 of the counter-frame 6 comprises the step of coupling the lower end 61 of the counter-frame 6 with a seat 10 in the body 2.
  • the head 7 is inserted into the seat 10.
  • the step of positioning the head 7 inside the seat 10 is preferably carried out manually by an operator using the handle 13.
  • the boom 3 defines a predetermined parking angle and may advantageously have a reduced bulk as compared with the working state.
  • the predetermined parking angle is greater than 80°. More preferably, this angle is 82°. In other words, in the second configuration the boom 3 defines an angle of 82° with respect to a plane parallel to the bearing surface S. By way of example, the operating angle is about 79° if the predetermined parking angle is 82°.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Ropes Or Cables (AREA)
EP21196542.1A 2020-09-18 2021-09-14 Crane Active EP3971126B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102020000022006A IT202000022006A1 (it) 2020-09-18 2020-09-18 Gru a fune

Publications (2)

Publication Number Publication Date
EP3971126A1 EP3971126A1 (en) 2022-03-23
EP3971126B1 true EP3971126B1 (en) 2023-10-18

Family

ID=73643232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21196542.1A Active EP3971126B1 (en) 2020-09-18 2021-09-14 Crane

Country Status (3)

Country Link
EP (1) EP3971126B1 (it)
ES (1) ES2966607T3 (it)
IT (1) IT202000022006A1 (it)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6093691U (ja) * 1983-11-29 1985-06-26 住友重機械工業株式会社 伸縮式クレ−ンジブ落下・転倒防止装置
US5484069A (en) * 1991-09-20 1996-01-16 The Manitowoc Company, Inc. Process for self-disassembling a crawler crane
US6131751A (en) * 1996-04-26 2000-10-17 Manitowoc Crane Group, Inc. Counter weight handling system and boom parking device
US8936167B2 (en) * 2010-12-17 2015-01-20 Kobelco Cranes Co., Ltd. Crane

Also Published As

Publication number Publication date
EP3971126A1 (en) 2022-03-23
IT202000022006A1 (it) 2022-03-18
ES2966607T3 (es) 2024-04-23

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