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
• • 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
  • B66C23/66—Outer or upper end constructions

Definitions

• the technical field of the invention is that of telescopic cranes and in particular auxiliary lifting devices intended to equip a telescopic boom crane.
• Telescopic boom cranes are well known. They include a fixed member in which at least one movable member is slidably mounted in order to give the boom a variable length.
• Patent EP1342615 describes such a type of telescopic crane fitted to an armored vehicle.
• the crane thus disclosed comprises a first end to which is fixed a first end of a sling.
• the second end of the sling is attached to a load which must be lifted and then moved around the vehicle.
• the charge is an armor plate located on the periphery of the vehicle. Note that the load is always located directly above the end of the boom.
• Such a crane despite its ability to vary its length, cannot lift a load located under the fixed member. To lift the load, it is necessary to raise the boom of the crane in a position close to the vertical in order to position the end of the boom above the load, which is not always possible for reasons of limitation of the load. maximum displacement in elevation of the boom which can be constrained structurally or due to the environment of the vehicle. The lifting template is therefore limited.
• the load is raised by pivoting the crane on site, which induces a curved trajectory of the lifted load, a trajectory liable to cause shocks with its environment such as the vehicle body.
• a crane operator To obtain a purely vertical trajectory of the load, a crane operator must then combine the pivoting movement in elevation of the crane with a translational movement of the mobile members of the crane, which is particularly difficult to achieve.
• the invention proposes to solve both this problem of limiting the lifting jig, in particular when a load is located under a fixed member of a telescopic boom crane, as well as the problem posed by the difficulty of lifting. the vertical of a load.
• the invention relates to a telescopic boom crane intended to be fixed to a vehicle, crane comprising a fixed member in which slides at least one movable member, characterized in that it carries an auxiliary lifting device which comprises a housing which is fixed to the fixed member of the jib substantially above a load to be lifted, and containing at least a first pulley, called a return pulley, with an axis transverse to a sliding direction of the jib, device also comprising a sling which is fixed by one end to an attachment point arranged at one end of the movable member and which is intended to be fixed by its other end to the load to be lifted, the sling thus passing over the return pulley in such a way that the sliding of the movable member causes by means of the sling the vertical lifting or lowering of the load.
• an auxiliary lifting device which comprises a housing which is fixed to the fixed member of the jib substantially above a load to be lifted, and containing at least a first pulle
• the box may contain a second pulley, called the bypass pulley, with an axis parallel to that of the first pulley, the axis of the second pulley being located at a distance D from the fixed member of the crane greater than the distance d which is the axis of the first pulley relative to the fixed member.
• several bores can be arranged on the fixed member to allow several possible fixing points for the housing along the fixed member.
• the subject of the invention is also a method for handling a load using a crane according to the preceding characteristics, a method comprising the following steps: - The box is placed so that the first pulley is positioned directly above the load; - A first end of the sling is fixed to the attachment point of the movable member; - the load is hung at the second end of the sling; - the extension of the mobile member is controlled until the load is lifted.
• the method will also include the following steps, after lifting the load: - The movement of the boom in elevation and / or bearing is controlled until the load is placed above a deposit location; - We order the retraction of the movable member until the load is deposited.
• FIG. 1 represents a view of a vehicle equipped with a crane according to the invention and during a first phase of use.
• FIG. 1 shows a detail view of an auxiliary lifting device according to the invention.
• FIG. 1 shows a view of a vehicle equipped with a crane according to the invention and during a second phase of use.
• FIG. 1 shows a view of a vehicle equipped with a crane according to the invention and during a third phase of use.
• a vehicle 100 comprises a crane 10 which comprises a telescopic boom 1 fixed to the roof 101 of the vehicle 100 (fixing means not shown).
• the telescopic boom 1 comprises a so-called fixed member 2 secured to a base 11 of the crane 10.
• Another member 4 called a movable member 4, can slide, under the action of a non-visible internal cylinder, in the fixed member 2 so as to form a telescopic boom 1.
• a site jack 3 allows the boom 1 to be raised or lowered at a desired site angle.
• the 360 degree bearing orientation of the crane 10 is achieved by means of a bearing motorization of the base 11 of the crane (not shown).
• the lower part of the boom 1 has an auxiliary lifting device 5 which will be better seen in figure 2.
• This auxiliary lifting device 5 comprises a sling 6 which is fixed by its first end to an attachment point 15 arranged at one end of the movable member 4, at the tip of an arrow 1.
• the auxiliary lifting device 5 also comprises a housing 7. containing at least a first pulley 8, called a deflection pulley, with an axis 8a transverse to a sliding direction of the arrow 1.
• the sling 6 travels through the housing 7 and passes over the return pulley 8.
• the second end of the sling 6 is hooked to a load 20 (here a spare wheel 20) which is located on the roof of the vehicle 100 and under the fixed member 2 of the boom 1.
• the housing 7 is fixed to the fixed member 4 of the boom 1 by suitable fixing means, such as bolts (not shown).
• suitable fixing means such as bolts (not shown).
• several holes can be provided on the fixed member 4 to allow several possible fixing points for the housing 7 along the fixed member 2.
• housing 7 is fixed substantially above the load 20 to be lifted.
• the housing 7 is formed of a pair of parallel flanges 7a (a single flange 7a is visible in the figure).
• the first pulley 8 is pivotally mounted between the flanges 7a and it is disposed at a lower end of the housing 7, oriented towards the lower end of the fixed member 2.
• the housing 7 contains a second pulley 9, called bypass pulley, which is also pivotally mounted on the flanges 7a and which is oriented towards the upper end of the fixed member 2.
• the first and the second pulley 8 and 9 have their axes 8a and 9a parallel, however the axis 8a of the first pulley 8 is at a distance d from the fixed member 2 which is less than the distance D separating the axis 9a from the second pulley 9 and the fixed member 2.
• the sling 6 passes between the flanges 7a and it is guided by the pulleys 8 and 9 which have grooves not shown.
• the sling 6 passes above the first pulley 8 and below the second pulley 9.
• the function of the first pulley 8 is to return the sling 6, in the vertical direction, to the load 20 to be lifted.
• the second pulley 9 makes it possible to separate the sling 6 from the fixed member 2 of the crane and also from the mobile member 4.
• the sling 6 can thus be tensioned between the attachment point 15 at the end of the boom 1 and the load 20 while avoiding any interference with the member (s) of the crane during lifting.
• the dotted line 6a in Figure 2 shows the path that the sling 6 would adopt above the first pulley 8 if the second pulley 9 were absent.
• the sling 6 could then interfere with an obstacle 11, for example a flange secured to a fixed or mobile member of the crane.
• the bypass pulley 9 makes it possible to deport the sling 6 below the second pulley 9, which therefore deportes the sling 6 away from the fixed member 2, by a distance D which is greater than the distance d separating the first pulley 8 and the fixed member 2.
• the distance d between the deflection pulley 8 and the fixed member 2 would nevertheless be greater than that which can be chosen when using a bypass pulley 9.
• the crane 10 can be pivoted in bearing as shown in FIG. 4, then lowered in elevation.
• the final deposit of the load to the ground is done by controlling the retraction of the mobile member 4 in the fixed member 2 over a length ⁇ 3, which causes a strictly vertical movement of the sling 6 down a length ⁇ 4, and placing the load 20 on the ground, that is to say without any horizontal movement component.
• the invention allows the safe and easy handling of a load which is placed under the fixed member of a crane jib which can be oriented in elevation and bearing, and that with a strictly vertical movement, both during lifting and during pose.
• the auxiliary lifting device can optionally be attached at different places on the fixed member 2 to allow the lifting to be adapted to the position of the load relative to the fixed member.
• the auxiliary lifting device according to the invention can thus constitute a kit which may or may not be attached to the crane as required.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Jib Cranes (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=69572111

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (4)

• 2019
  • 2019-10-24 FR FR1911803A patent/FR3102470B1/fr active Active
• 2020
  • 2020-10-06 WO PCT/IB2020/059381 patent/WO2021079219A1/fr unknown
  • 2020-10-06 EP EP20800715.3A patent/EP4048621B1/de active Active
  • 2020-10-06 ES ES20800715T patent/ES2970370T3/es active Active

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