WO2001074143A1 - Barre de suspension d'helicoptere pour monter du materiel de service - Google Patents

Barre de suspension d'helicoptere pour monter du materiel de service Download PDF

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Publication number
WO2001074143A1
WO2001074143A1 PCT/SE2001/000565 SE0100565W WO0174143A1 WO 2001074143 A1 WO2001074143 A1 WO 2001074143A1 SE 0100565 W SE0100565 W SE 0100565W WO 0174143 A1 WO0174143 A1 WO 0174143A1
Authority
WO
WIPO (PCT)
Prior art keywords
helicopter
bar
arrangement according
designed
tube
Prior art date
Application number
PCT/SE2001/000565
Other languages
English (en)
Inventor
Stefan ÖWRE
Bengt ÅSBERG
Original Assignee
Helitool Europe 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 Helitool Europe Ab filed Critical Helitool Europe Ab
Priority to AU2001242947A priority Critical patent/AU2001242947A1/en
Publication of WO2001074143A1 publication Critical patent/WO2001074143A1/fr
Priority to US14/661,288 priority patent/US9340612B2/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D1/00—Dropping, ejecting, releasing, or receiving articles, liquids, or the like, in flight
    • B64D1/22—Taking-up articles from earth's surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D9/00—Equipment for handling freight; Equipment for facilitating passenger embarkation or the like

Definitions

  • the present invention relates to an arrangement in a bar, which is intended to hang down beneath a helicopter or the like m order to carry equipment, such as saw equipment for tree lopping, which must be manoeuvred by the helicopter.
  • Helicopters are nowadays used for an ever-increasing number of operations that formerly could only be carried out from the ground.
  • One such operation is to clear power line lanes, that is to saw off tree branches and the like that extend too close to a power line.
  • saw equipment which is mounted on a bar suspended from the helicopter, the bar carrying a number of saw blades, a motor for driving the blades and requisite transmission elements.
  • the part of the bar that carries the saw blades may be 5 metres in length, for example, and may be connected to a carrier bar of approx . 15 metres, fixed in the helicopter.
  • the bar hangs straight down beneath the helicopter so that the points of articulation remain situated essentially along a straight line between the bar that carries the saw blades and the fixing point in the helicopter.
  • This also applies to the arrangement according to the second US patent specif cation 4815263.
  • a safety problem with known arrangements of this type is that serious accidents can occur as a result of the bar suspended from the helicopter being forced upwards and in through the helicopter body. This may happen, for example, if the helicopter for any reason such as a temporary engine malfunction suddenly descends some metres m height, so that the bar carrying the saw blades strikes the ground or other solid underlying surface. The same effect can occur if the saw blades get caught when they are forced down through branches.
  • the main object of the present invention is to provide an arrangement m bars for mounting suspended working equipment on helicopters, which eliminates or substantially reduces the risk of accidents caused by the upper end of the suspension bar being forced upwards towards the helicopter.
  • the invention is based on the realisation that this can be achieved by designing the bar connected to the helicopter m such a way that compressive forces acting on the bottom end of the bar cannot be transmitted to the upper end of the bar connected to the helicopter.
  • the special characteristic of an arrangement of the type specified m the first paragraph is that the bar is designed so that if its bottom end is subjected to an upwardly directed compressive force, the said force is deflected or substantially attenuated before it reaches the upper end of the bar connected to the helicopter, so that no upwardly directed force of harmful magnitude strikes the helicopter.
  • a temporary engine malfunction or the like, which may cause the helicopter to suddenly descend a number of metres so that the bar strikes against the ground will therefore not result m the bar being forced upwards and into the helicopter.
  • One way of achieving this result is to design the bar with an articulated knee joint, which m the working position is situated to the side of a line extending between the bottom and upper ends of the bar, connected to the working equipment and the helicopter respectively.
  • Such a design of the bar means that the compressive force, which acts on the bottom end of the bar, will cause the bar to swivel about the articulated knee joint, which is thereby forced out laterally without transmitting any significant force to that part of the bar situated above it.
  • the bar connected to the helicopter is designed m the form of at least two tubes telescopically displaceable m relation to one another.
  • the tubes In the working position the tubes are fully extended and cannot rotate relative to one another.
  • the tubes can, however, be pushed together by exerting a force at the end of the lower tube. This force will therefore not be transmitted to the fixing m the helicopter.
  • Fig. 1 shows a helicopter with saw equipment for clearing power line lanes and the like.
  • Fig. 2 shows the fixing arrangement m the helicopter on a larger scale.
  • Fig. 3 shows an embodiment of the bar connected to the helicopter with the bar telescoped.
  • Fig. 4 shows the bar according to Fig. 3 fully extended.
  • Fig. 5 shows an alternative embodiment of the bar connected to the helicopter.
  • Fig. 6 and 7 show the bar according to Fig. 5 in a position m which its bottom end is subjected to an upwardly directed compressive force.
  • Fig. 8 shows the bar according to Fig. 5 telescoped.
  • Figure 1 shows a helicopter 1 with equipment for clearing power line lanes or the like suspended therefrom.
  • the said equipment comprises a number of saw blades 3 mounted along a boom 2, the saw blades being driven from a combustion engine 4 by way of transmission elements arranged m the boom.
  • the saw equipment may be of conventional rigid type and is connected by way of an articulated joint 6 to a bar 5 suspended m the helicopter 1.
  • the bar 5 is designed in the form of two telescopic tubes 7 and 8, displaceable in relation to one another, which may be made of aluminium and have a total length of approximately 15 metres.
  • the upper tube, m this case the inner tube 7, is connected to an upper mounting plate 9 with an eye or hook 10 for mounting on the helicopter, see Figure 3.
  • the plate 9 is provided with two torque arms 11 pivoted to the plate, the other ends of which arms are connected to the two helicopter landing skids, each by way of a ball-and-socket joint 30.
  • the arms 11 absorb torsional movements of the plate 9 and the tube 7, which must not be capable of rotating relative to the helicopter.
  • Figure 3 shows the bar 5 on a larger scale, parts of the outer tube 8 and the inner tube 7 having been cut away to show the construction more clearly.
  • the bar 5 is intended to be suspended m the helicopter by way of the mounting eye 10, whilst the saw equipment is intended to be pivotally fitted to the bar 5 by means of an articulated shaft 6 at its bottom end.
  • a link 31 may be arranged between the bar 5 and the helicopter, see Figure 2.
  • the inner tube 7 is connected so that it cannot rotate to the mounting plate 9, which is m turn coupled so that it cannot rotate via the torque arms 11 to the helicopter.
  • the articulated shaft 6 is arranged m a lower coupling part 12, fixed so that it cannot rotate m the outer tube 8, which coupling part projects out through the bottom end of the tube 8.
  • 14 and 15 denote two steel casings arranged around the inner tube 7, which m the fully extended position of the outer tube 8, see Figure 4, go into the machined seats (not shown) on the inner surface of the fibre casing 13. In this position the inner and outer tubes 7, 8 are held precisely positioned in relation to one another without any mutual play.
  • 16 denotes a split plastic ring, which slides against the inside of the outer tube when this is extended in relation to the inner tube 7.
  • the bottom edge section of the fibre casing 13 is designed with a number of recesses 17, m this case 4 recesses, having wedge-shaped lateral surfaces and a rounded top.
  • the steel casing 15 is designed with at least one, preferably two engaging elements 18 of corresponding shape projecting towards the outer tube.
  • the use of the wedge-shaped or triangular seats 17 and projections 18 facilitates telescoping of the telescopic tubes 8 and 7 once a work operation is completed. This can otherwise be difficult if the helicopter has been turned somewhat, so that a torsional force prevails between the outer tube and the inner tube, which locks them relative to one another and makes any axial displacement of the outer tube 8 relative to the inner tube 7 more difficult.
  • a torsional force With the wedge-shaped engaging surfaces of the seat 17 and the interacting projection 18, such a torsional force provides a component m an axial direction, which facilitates telescoping of the telescopic tubes.
  • the suspension eye 10 is connected to a piston rod 19 running through the mounting plate 9, the piston rod being connected to a piston 20, which runs m a housing 21.
  • the piston is depressed towards its lower limit position by means of a compression spring 22.
  • the housing 21 is suitably oil-filled, the piston 20 being provided with overflow elements, which allow the oil with a certain resistance to pass from the chamber above the piston 20 to a chamber below the piston 20, when the latter is drawn upwards as a result of a large, instantaneous tensile force m the eye 10.
  • This provides a damping function, the purpose of which will be described in more detail below.
  • the arrangement described above is used as follows.
  • the outer tube 8 will be pushed up on the inner tube 7 at the occurrence of a compressive force at the bottom end of the saw equipment. This can occur if the helicopter, as a result of temporary engine malfunction, for example, descends towards the ground so that the saw equipment strikes the ground. A similar risk can also arise if the saw blades 3 get caught m the branches of a tree and the helicopter suddenly loses height. With the arrangement described this will merely result m the outer tube being pushed upwards to a corresponding extent on the inner tube. The risk of the helicopter and its crew being damaged or injured as a result of the suspension tube being pushed into the helicopter m such an event are thus eliminated or greatly reduced.
  • the helicopter pilot m order to perform such a rotation, merely has to lower the saw equipment so that the lower part rests on the ground and then lower the helicopter by at least a further 7 cm, so that the triangular engaging element 18 is released from the associated seat 17.
  • the pilot can then turn the helicopter through 180° and lift the equipment from the ground.
  • the engaging element 18 will thereby interact with a seat 17 situated on the opposite side of the fibre casing 13 and again rotationally lock the outer tube 8 m the new position relative to the inner tube 7.
  • the desired number of adjustment positions between the outer and inner tube 8, 7 can be obtained as a function of the number of seats 17 and/or engaging elements 18.
  • the function of the damping arrangement described above, comprising the spring 22, the piston 20 and the housing 21, is to reduce the stresses acting on both the suspension hook 32 m the helicopter 1 and on the saw equipment if the telescopic bar 5 is extended too rapidly. Such rapid extension may occur, for example, if the bar is unintentionally telescoped by contact with thick branches of a tree and then released again.
  • Figure 5 shows an alternative embodiment of the suspension bar 5.
  • the bar comprises two bars 23 and 24 pivoted to one another, of which the bar 23 is intended to be pivotally fixed m the helicopter and the bar 24 to be pivotally fixed m the boom 2, which carries the saw blades 3.
  • each bar is provided with an angled section 25, which sections at their outer ends are pivoted to one another by means of a joint pm 26.
  • the weight of the saw equipment produces a tensile force m the oars 23 and 24, which holds these m the position show, in Figure 5, the angled section 25 of the bottom bar resting on a stop heel 33, which projects from the angled section of the upper bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Earth Drilling (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

L'invention concerne un système sous forme de barre destinée à être suspendue en bas, sous un hélicoptère (1) ou similaire afin de porter du matériel, tel que du matériel de scierie pour entourer des arbres que l'hélicoptère doit convoyer. Cette barre est conçue de manière que son extrémité de base soit soumise à une force de compression exercée vers le haut, ladite force étant déviée ou sensiblement atténuée avant d'atteindre l'extrémité supérieure de la barre (5) connectée à l'hélicoptère (1). Ce système permet d'éviter que toute force aux effets néfastes ne touche l'hélicoptère, ce qui aurait pour effet de le faire descendre brusquement de quelques mètres.
PCT/SE2001/000565 2000-03-27 2001-03-19 Barre de suspension d'helicoptere pour monter du materiel de service WO2001074143A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001242947A AU2001242947A1 (en) 2000-03-27 2001-03-19 Suspension bar for helicopter for mounting working equipment
US14/661,288 US9340612B2 (en) 2001-03-19 2015-03-18 Stable aqueous formulations of adalimumab

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0001087-6 2000-03-27
SE0001087A SE519040C2 (sv) 2000-03-27 2000-03-27 Upphängningsstång för helikopter

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/020,733 Continuation US20140186361A1 (en) 2001-03-19 2013-09-06 Stable Aqueous Formulations of Adalimumab

Publications (1)

Publication Number Publication Date
WO2001074143A1 true WO2001074143A1 (fr) 2001-10-11

Family

ID=20279035

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/000565 WO2001074143A1 (fr) 2000-03-27 2001-03-19 Barre de suspension d'helicoptere pour monter du materiel de service

Country Status (3)

Country Link
AU (1) AU2001242947A1 (fr)
SE (1) SE519040C2 (fr)
WO (1) WO2001074143A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004103063A1 (fr) * 2003-05-22 2004-12-02 Mark Geoffrey Crumblin Scie aerienne
WO2011091540A1 (fr) * 2010-02-01 2011-08-04 Dart Aerospace Ltd. Ensemble monture de panier de chargement pour hélicoptère et son procédé d'utilisation
EP2543594A2 (fr) 2011-07-07 2013-01-09 Eurocopter Dispositif de fixation et de contrôle de l'inclinaison d'une élingue, et aéronef
EP3133015A1 (fr) * 2015-08-21 2017-02-22 Marenco Swisshelicopter AG Sous-structure de crochet de charge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554781A (en) * 1984-06-25 1985-11-26 Aerial Solutions, Inc. Airborne tree trimmer
US4815263A (en) * 1988-05-20 1989-03-28 Joe Hartung Airborne tree trimming apparatus
US5961070A (en) * 1997-02-03 1999-10-05 Bradford; Jeffrey C. Aerial chain saw

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554781A (en) * 1984-06-25 1985-11-26 Aerial Solutions, Inc. Airborne tree trimmer
US4815263A (en) * 1988-05-20 1989-03-28 Joe Hartung Airborne tree trimming apparatus
US5961070A (en) * 1997-02-03 1999-10-05 Bradford; Jeffrey C. Aerial chain saw

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004103063A1 (fr) * 2003-05-22 2004-12-02 Mark Geoffrey Crumblin Scie aerienne
WO2011091540A1 (fr) * 2010-02-01 2011-08-04 Dart Aerospace Ltd. Ensemble monture de panier de chargement pour hélicoptère et son procédé d'utilisation
CN102781779A (zh) * 2010-02-01 2012-11-14 达特航天有限公司 直升机货框的装配装置及其使用方法
RU2563379C2 (ru) * 2010-02-01 2015-09-20 Дарт Аэроспейс Лтд. Крепежное устройство грузовой корзины для вертолета и способ его использования
EP2543594A2 (fr) 2011-07-07 2013-01-09 Eurocopter Dispositif de fixation et de contrôle de l'inclinaison d'une élingue, et aéronef
FR2977565A1 (fr) * 2011-07-07 2013-01-11 Eurocopter France Dispositif de fixation et de controle de l'inclinaison d'une elingue, et aeronef
EP2543594A3 (fr) * 2011-07-07 2014-04-23 Airbus Helicopters Dispositif de fixation et de contrôle de l'inclinaison d'une élingue, et aéronef
EP3133015A1 (fr) * 2015-08-21 2017-02-22 Marenco Swisshelicopter AG Sous-structure de crochet de charge
CH711440A1 (de) * 2015-08-21 2017-02-28 Marenco Swisshelicopter Ag Lastenhakenunterbaukonstruktion zur Befestigung an oder in einer Kabinenstruktur eines Helikopters.
CN106467171A (zh) * 2015-08-21 2017-03-01 瑞士玛瑞恩克直升机公司 负载钩子结构
US10150565B2 (en) 2015-08-21 2018-12-11 Kopter Group Ag Load hook substructure

Also Published As

Publication number Publication date
SE519040C2 (sv) 2002-12-23
SE0001087D0 (sv) 2000-03-27
SE0001087L (sv) 2001-09-28
AU2001242947A1 (en) 2001-10-15

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