Staas & Halsey, LLP
Loader with a controlled vertical path of a working implement
 A loader with a controlled vertical path of a working implement comprises a frame and a pair of laterally spaced lift booms disposed at opposite lateral sides of the frame for elevational movement between lowered and raised positions, each of the lift booms having a forward free end which carries a working implement and a rear proximal end articulately mounted to the frame. A pair of front control links are arranged on the opposite sides of the frame, each of the front control links having a first end pivotally attached to the frame at a first pivot point and a second end pivotally connected to the rear proximal end of the respective lift boom at a first connection point. Furthermore, a pair of rear control links are disposed rearward of the front control links and arranged on the opposite sides of the frame, each of the rear control links having a first end pivotally attached to the frame at a second pivot point positioned rearwardly and downwardly of the first pivot point and a second end pivotally connected to the rear proximal end of the respective lift boom at a second connection point positioned rearwardly and upwardly of the first connection point when the lift booms are in the lowered position. The elevational movement of the lift booms is caused by a pair of boom cylinders in such a manner that the working implement can move along a generally sinusoidal travel path. 
Daewoo Heavy Industries Ltd.
E
E02F
inventional
Nag In Seung Kuh Moo Hwan
Kim Lee Jang