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
  • B66C23/18—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 specially adapted for use in particular purposes
  • B66C23/36—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
  • B66C23/40—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with a single prime mover for both crane and vehicle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
  • B66C23/62—Constructional features or details
  • B66C23/64—Jibs
  • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
  • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
  • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks

Definitions

• the invention relates to a mobile crane with telescopic boom according to the preamble of patent claim 1.
• a mobile crane is known with a boom which can be telescoped via a drive and which has a lattice-shaped basic box which is connected via a swivel joint in the working position to the superstructure of the mobile crane which can be pivoted about a vertical axis.
• a telescopic boom section is stored in this basic box.
• the telescopic boom is arranged essentially horizontally on the superstructure.
• the swivel joint for attaching the basic box is released and the entire boom can be moved a considerable distance backwards compared to its working position, so that the front overhang of the boom relative to the chassis of the mobile crane in the transport position is significantly less than the overhang, which is immediate after lowering the telescopic boom results from its working position.
• a telescopic crane boom is known from DE 3343 343 A1, which is provided in particular in forestry operations for the rapid movement of gripping tools which can be attached to the free end of the boom.
• This telescopic boom which has a basic box and two inner boxes guided therein, is in turn hydraulically pivoted to a lifting arm and thus movable.
• the lifting arm is in turn mounted on a column.
• the basic box of the telescopic boom which is only about half as long as the two inner boxes, is open on both ends, with the inner boxes protruding to the rear from the basic box when retracted.
• an outer telescopic cylinder which clearly extends beyond the length of the basic box on both sides, is arranged lengthways on the basic box, the extendable piston rod of which is articulated with its free end to the head of the larger of the two inner boxes.
• a chain hoist is provided that extends over the entire length of the larger inner box and extends between two deflection points, the lower run of which is a fastening point on the basic box and the upper run of which is a fastening point on the smaller one Has inner box.
• this crane boom provides for locking both inner boxes together and releasably carrying out one of the two fastening points for coupling the chain hoist.
• the reachable telescope length only corresponds to the extension length of the larger inner box. A decoupling of the telescopic drive is not provided with this crane boom.
• US Pat. No. 3,828,941 discloses a vehicle with a work basket arranged on an articulated arm, which is additionally provided at the free end of the articulated arm with a work boom, which consists of a short basic box and a single one is slidably mounted therein and more than twice as long inner box and can be extended via a multi-stage hydraulic cylinder attached to the outside of the basic box, the piston rod of which is connected to the rear end of the inner box.
• the total length of the jib is only a small part.
• the hydraulic cylinder is connected to the basic box both during work and during transportation of the vehicle.
• the object of the present invention is to develop a mobile crane of the generic type in such a way that, while maintaining the largest possible telescopic boom length and without the need to loosen the pivot bearing on the basic box, the overhang of the telescopic boom relative to the chassis of the mobile crane in the transport position is not the permissible dimension exceeds and the structural effort for this is as low as possible.
• the present invention provides for the storage of the base box of the telescopic boom in the working position to be left unchanged even in the transport position, ie to be stored without longitudinal displacement.
• the basic box has a length which is customary in accordance with the permitted dimension of the overhang. However, it is open or obvious at its foot end, in the vicinity of which its rotary bearing for erecting the telescopic boom is arranged, in such a way that an opening exists or is formed there which is so large that the outermost inner box, i.e. the inner box with the largest cross section, can be passed through this opening.
• the internal drive with which the individual telescopic sections, ie the inner boxes, can be extended and which must therefore be supported against the fixed basic box, can be detached from its connection with the basic box according to the invention.
• the invention provides a device for moving the inner boxes in the rear area behind the opening of the basic box. This means that for transport, the entire package of inner boxes is pushed back a certain distance through the opening at the foot of the basic box. In order to reach the working position, this shift is reversed again.
• This Measure allows the inner boxes to be made with a significantly greater length in relation to the length of the basic box, without the permissible size of the front overhang of the telescopic boom being exceeded. In contrast to the prior art known from DE 39 15 518 A1, the entire telescopic boom is therefore not required for reaching the
• connection of the drive for telescoping the inner boxes to the basic box must be released before moving the package of the inner boxes.
• a coupling device for this connection of the drive which is designed in the sense of a quick coupling, that is to say can be released and closed in the shortest possible time and with the least effort.
• the coupling device can preferably be operated by machine.
• FIG. 1 is a view of a mobile crane according to the invention
• Fig. 2 is a schematic side view of a telescopic boom of a mobile crane according to the invention.
• FIG. 3 shows the rear view of the telescopic boom according to FIG. 2.
• the vehicle crane 10 shown by way of example in FIG. 1 has a telescopic boom 1 which is inclined slightly obliquely downwards toward the front. This slight slope serves only to improve the roadworthiness of the mobile crane 10 since it improves the visibility for the driver. It has no influence on the essence of the invention and is therefore still essential in the sense of the present invention to be viewed horizontally.
• the telescopic boom is mounted on the superstructure 7 of the mobile crane 10 by a swivel joint 2. As can be seen on the front part of the telescopic boom 1, the telescopic boom 1 has several telescoped inner boxes.
• the mobile crane 10 is shown in the transport position in which the entire package of the inner boxes relative to the non-displaceably mounted basic box 6 of the
• Telescopic boom 1 is moved to the rear through an opening in the basic box.
• This displacement path is designated L v in FIG. 1.
• the length of the chassis is labeled L F. If necessary, the displacement path L v could also be larger, so that a somewhat larger overhang of the telescopic boom 1 would then also occur towards the rear. The overhang of the telescopic boom 1 in the front area has remained within the permitted limits due to the displacement of the inner boxes.
• FIGS. 2 and 3 show that the base box 6 of the telescopic boom 1 is rotatably mounted on a pivot joint 2 on bearing supports 9, which in turn are connected to the superstructure 7 of a mobile crane, not shown in detail.
• a hydraulic luffing cylinder 8 which is articulated via swivel joints on the superstructure 7 and on the underside of the basic box, the telescopic boom 1 can be raised from its illustrated essentially horizontal transport position into its working position.
• the telescopic boom 1 shown here has three inner boxes 3, 4, 5 which can be telescoped and telescoped.
• the basic box 6 At the boom foot, ie at the rear end of the basic box 6, in the vicinity of which the swivel joint 2 is located, the basic box 6 is provided with an opening 11 which is so large that the outermost inner box 3, which has the largest cross section of all inner boxes, can be guided through this opening 11.
• the latter is shown in FIG. 2.
• the displacement of the inner box 3 from the basic position according to the working position into the transport function is again denoted by L v .
• bolt connections or the like which can be operated mechanically (for example hydraulically or electromechanically), are suitable.
• a corresponding locking device is designated by reference number 13.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Jib Cranes (AREA)
• Control And Safety Of Cranes (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7672337

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Family Cites Families (22)

• 2001
  • 2001-01-22 DE DE10104310A patent/DE10104310B4/de not_active Expired - Fee Related
• 2002
  • 2002-01-18 AT AT02703503T patent/ATE304989T1/de not_active IP Right Cessation
  • 2002-01-18 JP JP2002557863A patent/JP2004520247A/ja active Pending
  • 2002-01-18 EP EP02703503A patent/EP1353873B1/fr not_active Expired - Lifetime
  • 2002-01-18 DE DE50204318T patent/DE50204318D1/de not_active Expired - Lifetime
  • 2002-01-18 WO PCT/DE2002/000213 patent/WO2002057177A2/fr active IP Right Grant
  • 2002-01-18 US US10/466,733 patent/US20040040924A1/en not_active Abandoned

Non-Patent Citations (1)

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