Telescopic boom for a vehicle crane

Abstract

The invention relates to a telescopic boom for a vehicle crane, comprising a base housing ( 1 ), which may be mounted to an upper construction on the vehicle crane in a horizontal joint ( 2 ), at the lower end thereof and has further horizontal joint ( 3 ), to which a tipping cylinder, for inclination of the telescopic boom, which may be connected to the upper construction, may be connected and several telescopic stages ( 4 - 11 ), running either in each other or in the base housing ( 1 ), all of which may be telescoped by means of a telescoping device ( 12 ) directly connected thereto and which may be locked relative to each other in the telescoped position. One of the telescoping stages ( 4 - 11 ) is embodied from two part pieces ( 4 a, b ) may be locked together by stage ( 4 ), and both part pieces ( 4 a, b ) are pivoted together by means of a hinge. The part pieces ( 4 a, b ) may be locked together by means of a locking device in respect of their longitudinal axis in a coaxial orientation and in at least one position, bent relative to each other. According to the invention, the hinge and locking device on the bending telescopic stage ( 4 ) lie within the internal contour of the next largest telescopic stage ( 5 ).

1 . A telescopic boom for a vehicle crane, comprising a base housing ( 1 ) which, at its lower end, can be mounted in a horizontal rotary joint ( 2 ) on an upper construction of the vehicle crane and has a further horizontal rotary joint ( 3 ), to which a tipping cylinder that can be connected to the upper construction can be attached in order to incline the telescopic boom, and comprising a plurality of telescopic stages ( 4 - 11 ) which are in each case guided in one another or in the base housing ( 1 ), which can all be telescoped by means of a telescoping device ( 12 ) that can be coupled directly to the respective telescopic stage, and can be locked with respect to one another in the telescoped position, one of the telescopable telescopic stages ( 4 - 11 ) being assembled as a telescopic stage that can be angled in its axial length from two portions ( 4   a, b ) and the two portions ( 4   a, b ) being capable of being pivoted in relation to each other by means of a hinge, and the portions ( 4   a, b ) being capable of being locked to each other by means of a locking device with regard to their longitudinal axes in a coaxial alignment and in at least one position angled in relation to each other, characterized in that the hinge on the locking device of the telescopic stage ( 4 ) that can be angled lies within the inner contour of the next largest telescopic stage ( 5 ).  
     
     
         2 . The telescopic boom as claimed in  claim 1 , characterized in that the telescopic stage ( 4 ) that can be angled is the innermost of the telescopic stages ( 4 - 11 ).  
     
     
         3 . The telescopic boom as claimed in one of claims  1 - 2 , characterized in that the hinge is arranged on the inside on the underside of the telescopic stage ( 4 ) that can be angled.  
     
     
         4 . The telescopic boom as claimed in one of claims  1 - 3 , characterized in that the hinge has at least one, in particular a pair of, joint pins ( 13   a, b ), which each interact with a joint lug ( 14   a, b ) which is connected to one portion ( 4   a ), and a joint fork ( 15   a, b ) which is connected to the other portion ( 4   b ).  
     
     
         5 . The telescopic boom as claimed in one of claims  1 - 4 , characterized in that the locking device is arranged on the inside on the upper side of the telescopic stage ( 4 ) that can be angled.  
     
     
         6 . The telescopic boom as claimed in one of claims  1 - 5 , characterized in that the locking device is formed by one or more hydraulic cylinder-piston systems which are attached to the inner side of the two portions ( 4   a, b ).  
     
     
         7 . The telescopic boom as claimed in one of claims  1 - 5 , characterized in that the locking device is formed by one or more threaded spindle drives which are attached to the inner side of the two portions ( 14   a, b ).  
     
     
         8 . The telescopic boom as claimed in one of claims  1 - 5 , characterized in that the locking device is formed as a pin locking system.  
     
     
         9 . The telescopic boom as claimed in  claim 8 , characterized in that in the locking device, at least one locking pin, in particular a pair of locking pins ( 16   a, b ), are provided which pins, given a coaxial alignment of the longitudinal axes of the portions ( 4   a, b ), are capable in each case of being inserted into coaxial drilled holes in a locking fork ( 18   a, b ) which is connected to one portion ( 4   a ), and a locking lug ( 17   a, b ) which is connected to the other portion ( 4   b ), in order to, achieve a locking of this coaxial alignment, and capable of being withdrawn from the drilled holes, canceling the locking.  
     
     
         10 . The telescopic boom as claimed in one of claims  8 - 9 , characterized in that, in order to fix an angled position of the two portions ( 4   a, b ), the locking device has a retaining lug ( 20 ) which in each case is connected by retaining pins ( 19   a, b ) to a retaining fork ( 21   a , b) which, on the inside, is in each case fixed to one of the two portions ( 14   a, b ).  
     
     
         11 . The telescopic boom as claimed in  claim 10 , characterized in that the retaining lug ( 20 ) has a slot ( 31 ) in which the retaining pins ( 19   a, b ) can slide.  
     
     
         12 . The telescopic boom as claimed in one of claims  8 - 11 , characterized in that the locking pins ( 16   a, b ) are in each case fixed to a pin carrier ( 23   a, b ) which can be moved parallel to the axes of the drilled holes in the locking forks ( 18   a, b ) and locking lugs ( 17   a, b ).  
     
     
         13 . The telescopic boom as claimed in  claim 12 , characterized in that the pin carriers ( 23   a, b ) can be moved by means of a threaded spindle drive ( 24 ,  25   a, b ).  
     
     
         14 . The telescopic boom as claimed in one of claims  12 - 13 , characterized in that the pin carriers ( 23   a, b ) can be moved by means of a hydraulic, pneumatic, electric-motor or electromagnetic drive.  
     
     
         15 . The telescopic boom as claimed in  claim 13 , characterized in that the threaded spindle drive ( 24 ,  25   a, b ) can be rotated by means of a hand crank ( 26 ).  
     
     
         16 . The telescopic boom as claimed in  claim 15 , characterized in that the hand crank ( 26 ) has a drive shaft ( 28 ) which can be displaced axially in a corresponding hollow shaft belonging to the threaded spindle drive (adjusting shaft  24 ) and is firmly guided in the latter so as to rotate with it.  
     
     
         17 . The telescopic boom as claimed in one of claims  15 - 16 , characterized in that the hand crank ( 26 ) has a handle that can be folded in.