Patent ID: 8226137

Claim:
A dual chain hoist arrangement comprising: a length-adjustable lifting beam ( 4 ) including a first lifting beam section ( 13 ) and second lifting beam section ( 14 ), said lifting beam sections ( 13 , 14 ) being connected to one another such that they can be moved relative to one another in a longitudinal direction, said lifting beam sections ( 13 , 14 ) each having one end that is located proximal to the other lifting beam section ( 13 , 14 ) and a distal end away from the other lifting beam section ( 13 , 14 ), a first chain wheel group ( 39 ) including two coaxially arranged chain wheels that are connected to one another without rotational play and are rotatably supported on the distal end of the first lifting beam section ( 13 ), a load chain anchor ( 34 ) adjacent to the first chain wheel group ( 39 ), an adjusting chain anchor ( 48 ) at the proximal end of the first lifting beam section ( 13 ), a first hook block ( 5 ) associated with the first lifting beam section ( 13 ), a second chain wheel group ( 44 ) including two coaxially arranged chain wheels that are connected to one another without rotational play, said chain wheels of said second chain wheel group ( 44 ) being rotatably supported at the distal end of the second lifting beam section ( 14 ) and arranged axially parallel to the first chain wheel group ( 39 ), two spaced-apart deflection chain wheels ( 42 , 43 ) supported axially parallel to the first chain wheel group ( 39 ) and arranged on the second lifting beam section ( 14 ), a deflection chain wheel ( 27 ) adjacent a proximal end of the second lifting beam section ( 14 ), a second hook block ( 6 ) associated with the second lifting beam section ( 14 ), a first load chain ( 35 ) that extends from the first chain wheel group ( 39 ) to the first hook block ( 5 ) and from the first hook block ( 5 ) to the load chain anchor ( 34 ), a second load chain ( 36 ) that extends from the first chain wheel group ( 39 ) to one of the two deflection chain wheels ( 42 ), and then to the second hook block ( 6 ), and ultimately from the second hook block ( 6 ) to the second chain wheel group ( 44 ) over the second deflection chain wheel ( 43 ), and an adjusting chain ( 37 ) that extends around a chain wheel of the second chain wheel group ( 44 ) and around the deflection chain wheel ( 27 ) on the proximal end of the second lifting beam section ( 14 ), and said adjusting chain ( 37 ) having ends that are fixed to said adjusting chain anchor ( 48 ).